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ResearcherID
- D-3057-2014 (1)
- M-1240-2017 (1)
- N-8985-2015 (1)
When More Is Better – Consumption Priming Decreases Responders’ Rejections in the Ultimatum Game
(2017)
During the past decades, economic theories of rational choice have been exposed to outcomes that were severe challenges to their claim of universal validity. For example, traditional theories cannot account for refusals to cooperate if cooperation would result in higher payoffs. A prominent illustration are responders’ rejections of positive but unequal payoffs in the Ultimatum Game. To accommodate this anomaly in a rational framework one needs to assume both a preference for higher payoffs and a preference for equal payoffs. The current set of studies shows that the relative weight of these preference components depends on external conditions and that consumption priming may decrease responders’ rejections of unequal payoffs. Specifically, we demonstrate that increasing the accessibility of consumption-related information accentuates the preference for higher payoffs. Furthermore, consumption priming increased responders’ reaction times for unequal payoffs which suggests an increased conflict between both preference components. While these results may also be integrated into existing social preference models, we try to identify some basic psychological processes underlying economic decision making. Going beyond the Ultimatum Game, we propose that a distinction between comparative and deductive evaluations may provide a more general framework to account for various anomalies in behavioral economics.
Context: Patients with primary adrenal insufficiency (PAI) or congenital adrenal hyperplasia (CAH) are at a high risk of adrenal crisis (AC). Glucocorticoid sensitivity is at least partially genetically determined by polymorphisms of the glucocorticoid receptor (GR).
Objectives: To determine if a number of intercurrent illnesses and AC are associated with the GR gene polymorphism \(Bcl\)I in patients with PAI and CAH.
Design and patients: This prospective, longitudinal study over 37.7 ± 10.1 months included 47 PAI and 25 CAH patients. During the study period, intercurrent illness episodes and AC were documented.
Results: The study period covered 223 patient years in which 21 AC occurred (9.4 AC/100 pat years). There were no significant differences between \(Bcl\)I polymorphisms (CC (n=29), CG (n=34) and GG (n=9)) regarding BMI, hydrocortisone equivalent daily dose and blood pressure. We did not find a difference in the number of intercurrent illnesses/patient year among \(Bcl\)I polymorphisms (CC (1.5±1.4/pat year), CG (1.2±1.2/pat year) and GG (1.6±2.2/pat year)). The occurrence of AC was not significantly different among the homozygous (GG) genotype (32.5 AC/100 pat years), the CC genotype (6.7 AC/100 pat years) and the CG genotype (4.9 AC/100 pat years). Concomitant hypothyroidism was the highest in the GG genotype group (5/9), compared to others (CC (11/29) and CG (11/34)).
Conclusions: Although sample sizes were relatively small and results should be interpreted with caution, this study suggests that the GR gene polymorphism \(Bcl\)I may not be associated with the frequencies of intercurrent illnesses and AC.
Purpose: Research dealing with ischemic preconditioning (IPC) has primarily focused on variables associated to endurance performance with little research about the acute responses of IPC on repeated multidirectional running sprint performance. Here we aimed to investigate the effects of IPC of the arms and the legs on repeated running sprint performance with changes-of-direction (COD) movements.
Methods: Thirteen moderately-to-well-trained team-sport athletes (7 males; 6 females; age: 24 ± 2 years, size: 175 ± 8 cm, body mass: 67.9 ± 8.1 kg) performed 16 × 30 m all-out sprints (15 s rest) with multidirectional COD movements on a Speedcourt\(^{©}\) with IPC (3 × 5 min) of the legs (IPC\(_{leg}\); 240 mm Hg) or of the arms (remote IPC: IPC\(_{remote}\); 180–190 mm Hg) 45 min before the sprints and a control trial (CON; 20 mm Hg).
Results: The mean (±SD) time for the 16 × 30 m multidirectional COD sprints was similar between IPC\(_{leg}\) (Mean t: 16.0 ± 1.8 s), IPC\(_{remote}\) (16.2 ± 1.7 s), and CON (16.0 ± 1.6 s; p = 0.50). No statistical differences in oxygen uptake (mean difference: 0%), heart rate (1.1%) nor muscle oxygen saturation of the vastus lateralis (4.7%) and biceps brachii (7.8%) between the three conditions were evident (all p > 0.05).
Conclusions: IPC (3 × 5 min) of the legs (220 mm Hg) or arms (180–190 mm Hg; remote IPC) applied 45 min before 16 × 30 m repeated multidirectional running sprint exercise does not improve sprint performance, oxygen uptake, heart rate nor muscle oxygen saturation of the vastus lateralis muscle when compared to a control trial.
Das Renin-Angiotensin-Aldosteron-System (RAAS) reguliert den Blutdruck sowie den Elektrolyt- und Wasserhaushalt. Das aktive Peptid, Angiotensin II (AngII), führt dabei zur Vasokonstriktion und in höheren Konzentrationen zu Bluthochdruck. Hypertensive Patienten haben ein erhöhtes Risiko an Krebs zu erkranken, vor allem an Nierenkrebs. Wir konnten bereits in vivo zeigen, dass AngII in der Lage ist, den Blutdruck zu steigern und dosisabhängig zu DNA-Schäden über den Angiotensin II Typ 1-Rezeptor (AT1R) führt. Ein stimuliertes RAAS kann ferner über die Aktivierung der NADPH-Oxidase, einer Hauptquelle der Generierung reaktiver Sauerstoffspezies (ROS) in der Zelle, zu oxidativem Stress führen. Zielsetzung dieser Arbeit war es zum einen, mit Hilfe von AT1a-Rezeptor-defizienten Mäusen in vivo zu prüfen, ob die Bildung von ROS, sowie die Bildung von DNA-Schäden in der Niere und im Herzen unabhängig von einem erhöhten Blutdruck auftreten. Zum anderen sollte, ebenfalls in vivo, untersucht werden, ob eine oder beide von zwei untersuchten Isoformen der NADPH-Oxidase (Nox) für die Auslösung oxidativen Stresses in der Niere verantwortlich ist.
Zunächst wurden für den Versuch zur Überprüfung der Abhängigkeit AngII-induzierter DNA-Schäden vom Blutdruck männliche C57BL/6-Mäuse und AT1a-Knockout (KO)-Mäuse mit osmotischen Minipumpen ausgestattet, die AngII in einer Konzentrationen von 600 ng/kg min über einen Zeitraum von 28 Tagen abgaben. Zusätzlich wurde eine Gruppe von AngII-behandelten Wildtyp (WT)-Mäusen mit dem AT1-Rezeptor-Blocker Candesartan (Cand) behandelt. Während des Versuchszeitraumes fanden regelmäßige, nicht-invasive Blutdruckmessungen an den wachen Mäusen statt. In WT-Mäusen induzierte AngII Bluthochdruck, verursachte erhöhte Albumin-Level im Urin und führte zur Bildung von ROS in Niere und im Herzen. Außerdem traten in dieser Gruppe DNA-Schäden in Form von Einzel- und Doppelstrangbrüchen auf. All diese Reaktionen auf AngII konnten jedoch durch gleichzeitige Behandlung mit Cand verhindert werden. AT1a-KO-Mäuse hatten, verglichen mit WT-Kontrollmäusen, einen signifikant niedrigeren Blutdruck und normale Albumin-Level im Urin. In AT1a-KO-Mäusen, die mit AngII behandelt wurden, konnte kein Anstieg des systolischen Blutdrucks sowie kein Einfluss auf die Nierenfunktion gefunden werden. Jedoch führte AngII in dieser Gruppe zu einer Steigerung von ROS in der Niere und im Herzen. Zusätzlich wurden genomische Schäden, vor allem in Form von Doppelstrangbrüchen signifikant in dieser Gruppe induziert. Auch wenn AT1a-KO-Tiere, unabhängig von einer AngII-Infusion, keine eingeschränkte Nierenfunktion zeigten, so wiesen sie erhebliche histopathologische Schäden im Hinblick auf die Glomeruli und das Tubulussystem auf. Diese Art von Schäden deuten auf eine besondere Bedeutung des AT1aR im Hinblick auf die embryonale Entwicklung der Niere hin. Zusammenfassend beweisen die Ergebnisse dieses Experiments eindeutig, dass eine AngII-induzierte ROS-Produktion und die Induktion von DNA-Schäden unabhängig von einem erhöhten Blutdruck auftreten. Da in der AngII-behandelten AT1a-KO-Gruppe eine signifikant höhere Expression des AT1b-Rezeptors zu finden war und die Blockade von beiden Rezeptorsubtypen mit Cand zu einer Verhinderung der schädlichen Effekte durch AngII führte, scheint der AT1bR im Falle einer AT1aR-Defizienz für die Entstehung der Schäden zuständig zu sein.
Ziel des zweiten Experimentes war es, den Beitrag der Nox2 und Nox4 zum oxidativen DNA-Schaden in vivo zu untersuchen. Hierfür wurden männliche C57BL/6-Mäuse und Nox2- oder Nox4-defiziente Mäuse mit osmotischen Minipumpen ausgestattet, die AngII in einer Konzentration von 600 ng/kg min über einen Zeitraum von 28 Tagen abgaben. Im WT-Stamm und in beiden Nox-defizienten Stämmen induzierte AngII Bluthochdruck, verursachte erhöhte Albumin-Level im Urin und führte zur Bildung von ROS in der Niere. Außerdem waren in allen AngII-behandelten Gruppen genomische Schäden, vor allem in Form von Doppelstrangbrüchen, erhöht. Auch in Abwesenheit von AngII wiesen Nox2- und Nox4-defiziente Mäuse mehr Doppelstrangbrüche im Vergleich zu WT-Kontrollmäusen auf. Interessanterweise kompensieren allerdings weder Nox2 noch Nox4 das Fehlen der jeweils anderen Isoform auf RNA-Basis. Aufgrund dieser Ergebnisse schließen wir, dass bislang keine Isoform alleine für die Generierung von oxidativen DNA-Schäden in der Niere verantwortlich gemacht werden kann und dass eine Beteiligung einer weiteren Nox-Isoform sehr wahrscheinlich ist. Möglicherweise könnten aber auch andere ROS-generierende Enzyme, wie Xanthinoxidase oder Stickoxidsynthase involviert sein. Da genomische Schäden in Nieren von Nox2- und Nox4-defizienten Mäusen in Abwesenheit von AngII gegenüber den Schäden in WT-Kontrollmäusen erhöht waren, könnten die beiden Isoformen auch eine schützende Funktion im Bereich von Nierenkrankheiten übernehmen. Da dies aber bislang nur für Nox4 beschrieben ist, ist es wahrscheinlicher, dass das Fehlen von einer der beiden Isoformen eher einen Einfluss auf die Embryonalentwicklung hat. Um dies jedoch abschließend zu klären wäre es sinnvoll mit induzierbaren Knockout-Modellen zu arbeiten, bei denen mögliche entwicklungsbedingte Effekte minimiert werden können.
For persistent infections of the mammalian host, African trypanosomes limit their population size by quorum sensing of the parasite-excreted stumpy induction factor (SIF), which induces development to the tsetse-infective stumpy stage. We found that besides this cell density-dependent mechanism, there exists a second path to the stumpy stage that is linked to antigenic variation, the main instrument of parasite virulence. The expression of a second variant surface glycoprotein (VSG) leads to transcriptional attenuation of the VSG expression site (ES) and immediate development to tsetse fly infective stumpy parasites. This path is independent of SIF and solely controlled by the transcriptional status of the ES. In pleomorphic trypanosomes varying degrees of ES-attenuation result in phenotypic plasticity. While full ES-attenuation causes irreversible stumpy development, milder attenuation may open a time window for rescuing an unsuccessful antigenic switch, a scenario that so far has not been considered as important for parasite survival.
Das Ziel der vorliegenden Arbeit war die retrospektive Datenerhebung der von Patienten mit Tinea capitis, die zwischen 1990 und 2014 in der dermatologischen Abteilung behandelt bzw. im mykologischen Labor der Universitätsklinik Würzburg diagnostiziert wurden. Zunächst wurden Daten (Geburtsdatum, Alter, Geschlecht, eingesendetes Material, Erreger und eventuelle weitere Pilzerkrankungen) mit Hilfe der Laborbücher ab dem Jahr 1990 gewonnen. Insgesamt wurden 150 diagnostizierte Patientenfälle erfasst. Zusätzlich wurden alle aus den Laborbüchern identifizierten Fälle ab dem Jahr 2002 (n=55) mit den vorhandenen, digitalen Karteikarten im SAP abgeglichen und standardisierte Parameter erfasst (Herkunft, Vorerkrankungen, Medikamentenanamnese, Raucheranamnese, Alkoholanamnese, Diagnose, Therapie, Krankheitsverlauf). Die statistische Datenverarbeitung erfolgte mit dem Programm IBM SPSS Statistics 23 für Mac. Zusätzlich wurden die Daten anhand der Zeiträume von 01/1990- 6/2002 und 07/2002- 12/2014 miteinander verglichen.
Der Anteil an Tinea capitis in Bezug zu allen kulturell nachgewiesenen Dermatomykosen wie Tinea pedum et unguium pedum, Tinea corporis, Tinea faceii, Tinea barbae und Tinea manum lag bei lediglich 3,4%.
Die Patienten waren durchschnittlich 12 Jahre alt. Die Altersspanne erstreckte sich zwischen 0 und 78 Jahren. Auffallend ist der deutlich geringere Median von 6 Jahren und der ebenso niedrigere Wert der 75. Perzentile von 10,25 Jahren. Der Durchschnittswert von 12 Jahren ist also ein, durch Patienten mit einem hohen Alter, täuschender Wert. Die Erkrankung dominiert in der Altersgruppe der 0- bis 5-jährigen Kinder, mit einem deutlichen Peak bei den 3-Jährigen. Die zunehmende Betreuung von Kleinkindern in Gemeinschaftseinrichtungen ist als mögliche Infektionsquelle zu diskutieren. Daher sollten allgemein verbindliche Regelungen zur Isolation von Kindern mit einer durch anthropophile Dermatophyten verursachten Tinea capitis erstellt werden. Der Anteil der Erwachsenen (ab 18 Jahre) liegt bei ungewöhnlich hohen 16%, da Tinea capitis üblicherweise als pädiatrische Mykose bekannt ist. Die klinische Manifestation einer Tinea capitis ist oft polymorph und atypisch, so dass auch im adulten Alter bei einer vorhandenen Symptomatik am Kapillitium als Differentialdiagnose eine Dermatophytose in Betracht gezogen und ggf. entsprechende Diagnostik veranlasst werden sollte. Mit dementsprechenden 84% der Patienten unter 18 Jahren hat die Tinea capitis auch in dieser Untersuchung eine bedeutende Präsenz im pädiatrischen Patientengut. Daher sollte bei Veränderungen am Kapillitium eine Tinea capitis als Differentialdiagnose in Betracht gezogen werden. Die Geschlechterverteilung zeigt eine signifikante Tendenz zum männlichen Geschlecht mit 61,3% (n=92). Zwischen 01/1990 und 06/2002 war der bevorzugte Befall männlicher Patienten ausgeprägter als im nachfolgenden Zeitraum. Geschlechtsspezifische Gewohnheiten wie die Ausübung verschiedener Sportarten könnten ursächlich sein. So ist der T. tonsurans, der wegen seiner Übertragungswege auch als „Ringerpilz“ bezeichnet wird, in der Altersgruppe der 11- bis 17-jährigen Patienten am häufigsten nachgewiesene Erreger. Das weibliche Geschlecht war in dieser Altersgruppe deutlich unterrepräsentiert.
Das Erregerspektrum hat sich im zeitlichen Verlauf von 01/1990 bis 12/2014 mit einer zunehmenden Diversität gezeigt. Führender Erreger im gesamten Zeitraum ist der zoophile Microsporum canis (38,7%). Für eine erfolgreiche Therapie hat die interdisziplinäre Zusammenarbeit zwischen Dermatologen und Veterinärmedizinern einen hohen Stellenwert. Insgesamt haben die zoophilen Dermatophyten einen Anteil von 55,3 %. Beachtenswert ist T. tonsurans als zweithäufigster Erreger (24%). Zusammen mit T. rubrum bedingt T. tonsurans den Hauptteil der beträchtlichen Prozentzahl der anthropophilen Dermatophyten einer Tinea capitis (44%). Zur Kontrolle einer anthropophilen Tinea capitis ist bei geringer klinischer Symptomatik eine mykologische Diagnostik aller Familienangehörigen indiziert. Um Reinfektionen zu meiden, sollte die Therapie der erkrankten Familienangehörigen simultan erfolgen. Im Erwachsenenalter trat T. rubrum als häufigster Erreger der Tinea capitis auf. Geophile Erreger sind nur selten Ursache einer Tinea capitis; entsprechend konnte nur ein einziges Mal M. gypseum isoliert werden. Die frühzeitige Diagnose und eine geeignete, „spezies-spezifische“ Therapie hilft Ausbrüche zu vermeiden. Anhand der aktuellen Flüchtlingswelle aus Afrika und Asien nach Europa ist eine epidemiologische Veränderung des Erregerspektrums der Tinea capitis zu erwarten. Ein Screening, auch um andere infektiöse, mykologische Erkrankungen auszuschließen oder ggf. rechtzeitig zu therapieren, ist angeraten, um eine Infektion des Umfeldes zu vermeiden.
Aspergillus (A.) fumigatus is an opportunistic fungal mold inducing invasive aspergillosis (IA) in immunocompromised patients. Although antifungal activity of human natural killer (NK) cells was shown in previous studies, the underlying cellular mechanisms and pathogen recognition receptors (PRRs) are still unknown. Using flow cytometry we were able to show that the fluorescence positivity of the surface receptor CD56 significantly decreased upon fungal contact. To visualize the interaction site of NK cells and A. fumigatus we used SEM, CLSM and dSTORM techniques, which clearly demonstrated that NK cells directly interact with A. fumigatus via CD56 and that CD56 is re-organized and accumulated at this interaction site time-dependently. The inhibition of the cytoskeleton showed that the receptor re-organization was an active process dependent on actin re-arrangements. Furthermore, we could show that CD56 plays a role in the fungus mediated NK cell activation, since blocking of CD56 surface receptor reduced fungal mediated NK cell activation and reduced cytokine secretion. These results confirmed the direct interaction of NK cells and A. fumigatus, leading to the conclusion that CD56 is a pathogen recognition receptor. These findings give new insights into the functional role of CD56 in the pathogen recognition during the innate immune response.
Diese Arbeit widmet sich der Untersuchung einer Kopienzahlvariante (CNV) im Erbgut, die zu
einer genomischen Duplikation des SLC2A3-Gens führt. Die Auswirkungen der SLC2A3-
Duplikation wurden im Zellkulturmodell und durch bildgebende Verfahren untersucht. Für die
SLC2A3-Duplikation konnte eine populationsspezifische Assoziation mit ADHS gezeigt
werden (Merker et al. 2017). SLC2A3 kodiert für den neuronalen Glukosetransporter GLUT3,
der u.a. Prozesse der Neurotransmitterfreisetzung und Synaptogenese vermittelt und daher
wichtig für die Hirnreifung ist. Mögliche Endpunkte für Endophänotypen, die auf einem
alterierten Glukosemetabolismus basieren, sind dysfunktionale Hungerregulationsmechanismen
ebenso wie eine veränderte neurale Reaktivität gegenüber emotionalen Stimuli
und Belohnungsreizen.
In zwei peripheren Zellmodellen konnte gezeigt werden, dass die SLC2A3-Duplikation
Gen-Dosis-abhängig zu einer Steigerung der basalen SLC2A3-mRNA Expression führt. Ein
Expressionsunterschied auf Proteinebene konnte jedoch nicht gefunden werden. Metabolischer
Zellstress durch Aushungern der Zellkulturen und eine niedrige Glukosekonzentration im
Zellkulturmedium führten zu einer signifikanten Erhöhung des schon unter basalen
Bedingungen vorhandenen SLC2A3-Expressionsunterschiedes zwischen Duplikations- und
Kontrollzelllinien. Dies deutet darauf hin, dass die SLC2A3-Duplikation bei verminderter
zellulärer Energiezufuhr zu einer Überkompensation der Glukoseaufnahme führt.
In einer fMRT-Untersuchung wurden erwachsene ADHS-Patienten mit SLC2A3-
Duplikation mit ADHS-Patienten und gesunden Kontrollen mit jeweils 2 Genkopien
hinsichtlich ereigniskorrelierter neuraler Aktivität als Antwort auf emotionale Stimuli und
Essensreize verglichen. Es konnte gezeigt werden, dass die SLC2A3-Duplikation zu einer
veränderten Reaktivität gegenüber hochkalorischen Essensreizen führt, was sich in einem durch
maschinelles Lernen identifizierten multivariaten neuralen Antwortmuster und einer relativen
Unterschätzung des Kaloriengehaltes hochkalorischer Nahrung zeigt. Bei der univariaten
Gesamthirn-Analyse der Bilddaten wurden keine signifikanten Gruppenunterschiede gefunden,
was darauf hinweist, dass unter den gewählten Versuchsbedingungen keine fokal
umschriebenen Gruppenunterschiede der Hirnaktivierung bestehen.
Diese Arbeit zeigt, dass die SLC2A3-Duplikation zu einer Erhöhung der SLC2A3-
Genexpression mit bisher unbekannten Auswirkungen auf nachgeschaltete Stoffwechselwege
und zu einem komplex veränderten neuralen Antwortmuster führt, das durch einen linearen
Zusammenhang nicht zu beschreiben ist. Weitere Untersuchungen auf Zellebene und eine
Erweiterung der bildgebenden Verfahren könnten zu einer besseren Einordnung der SLC2A3-
Duplikation bezüglich ihres Anteils an der endophänotypischen Varianz der ADHS führen.
Das kolorektale Karzinom stellt die dritthäufigste Tumorerkrankung weltweit dar. Die Risikofaktoren sind vielseitig und werden in exogene und endogene Faktoren eingeteilt. Eine wichtige Präventionsmaßnahme von Kolonkarzinom ist die komplette endoskopische Koloskopie, die ab dem 55. Lebensjahr empfohlen wird. Der Goldstandard zur Behandlung von Kolonkarzinom ist nach wie vor die chirurgische Tumorresektion mit mikroskopisch nachgewiesener Tumorfreiheit. Eine chirurgische Sanierung der Fernmetastasen, welche am häufigsten in der Leber vorkommen, ist bei betroffenen Patienten anzustreben. Eine adjuvante Chemotherapie wird je nach UICC-Stadium des Tumors durchgeführt. Im Gegensatz zur Behandlung einiger maligner Tumorerkrankungen ist der Einsatz von Antikörpern noch kein fester Bestandteil der Therapie von Kolonkarzinomen.
In dieser Arbeit wurde Untersuchungsmaterial von 41 Patienten mit Kolonkarzinom, die am Universitätsklinikum Würzburg in den Jahren 1997 bis 2012 behandelt wurden, analysiert. Dabei wurden Paraffinschnitte vom Primärtumor, regionalen Lymphknotenmetastasen und Lebermetastasen der einzelnen Patienten mit 2 verschiedenen monoklonalen IgM-Antikörpern, PAT-SM6 und PAT-LM1, gefärbt und mikroskopisch untersucht. Der Antikörper PAT-SM6 wurde aus einem an einem Magenkarzinom erkrankten Patienten isoliert und bindet an eine Isotyp-Form des 'Glucose-Regulated' Protein (GRP)-78PAT-SM6. Als Zielstruktur des PAT-LM1 Antikörpers wurde eine tumorspezifische Form von NONO (Non-POU domain-containing octamer-binding protein) identifiziert (NONOPAT-LM1). Für beide Rezeptor-Isoformen wurde nachgewiesen, dass sie nur auf malignen epithelialen Zellen, nicht aber auf gesunden Zellen exprimiert werden. Anhand dieser Arbeit konnte gezeigt werden, dass PAT-SM6 die Tumorzellen der Lebermetastasen stärker anfärbte als Zellen des Primärtumors. Für die PAT-LM1 Antikörperfärbung wurde ein ähnliches Resultat erzielt. In Bezug auf das Lebensalter der Patienten wiesen die Tumorzellen von älteren Patienten (ab dem 65. Lebensjahr) eine stärkere Antikörperbindung durch PAT-SM6 und PAT-LM1 auf. Interessant war auch die Feststellung, dass die Tumorzellen der Lebermetastasen von verstorbenen Patienten durch PAT-LM1 stärker gefärbt waren als die von zum Untersuchungszeitpunkt noch lebenden Patienten. Die Bindungsunterschiede zwischen PAT-SM6 und PAT-LM1 könnten neue diagnostische und therapeutische Möglichkeiten bei Kolonkarzinomen bieten und somit zukünftig eine individuelle Tumortherapie ermöglichen.
Background:
Clinical reasoning in Neurology is based on general associations which help to deduce the site of the lesion. However, even “golden principles” may occasionally be deceptive. Here, we describe the case of subacute flaccid tetraparesis due to motor cortical lesions. To our knowledge, this is the first report to include an impressive illustration of nearly symmetric motor cortical involvement of encephalitis on brain MRI.
Case presentation:
A 51 year old immunocompromized man developed a high-grade pure motor flaccid tetraparesis over few days. Based on clinical presentation, critical illness polyneuromyopathy was suspected. However, brain MRI revealed symmetrical hyperintensities strictly limited to the subcortical precentral gyrus. An encephalitis, possibly due to CMV infection, turned out to be the most likely cause.
Conclusion:
While recognition of basic clinical patterns is indispensable in neurological reasoning, awareness of central conditions mimicking peripheral nervous disease may be crucial to detect unsuspected, potentially treatable conditions.
Background:
Sleep-related eating may occur in the context of mental illness, sleep disorders, or psychopharmacological treatment. Frequently, sleep-related eating leads to severe weight gain and, so far, there are no treatment options for the condition.
Case presentation:
We report the case of a 54-year-old white woman with depression, panic disorder, and sleep apnea under treatment with various antidepressants who developed severe sleep-related eating. Her sleep-related eating completely vanished after addition of agomelatine, it reoccurred after cessation of agomelatine, and vanished again after her re-exposure to another melatonergic drug, extended melatonin.
Conclusions:
This case suggests that melatonergic drugs lead to relief from sleep-related eating, even when the condition occurs in the context of physical and mental disorders as well as psychopharmacological treatment.
The importance of enterprise systems is increasingly growing and they are in the center of attention and consideration by organizations in various types of business and industries from extra-large public or private organizations to small and medium-sized service sector business. These systems are continuously advancing functionally and technologically and are inevitable and ineluctable for the enterprises to maximize their productivity and integration in current competitive national and global business environments.
Also, since local software solutions could not meet the requirements of especially large enterprises functionally and technically, and as giant global enterprise software producers like SAP, Oracle and Microsoft are improving their solutions rapidly and since they are expanding their market to more corners of the globe, demand for these globally branded low-defect software solutions is daily ascending. The agreements for international ERP implementation project consultancy are, therefore, exponentially increasing, while the research on the influencing factors and know-hows is scattered and rare, and thus, a timely urgency for this field of research is being felt.
The final developed five-in-five framework of this study, for the first time, collects all mentioned-in-the-history critical success factors and project activities, while sequencing them in five phases and categorizing them in five focus areas for international ERP implementation projects. This framework provides a bird’s-eye view and draws a comprehensive roadmap or instruction for such projects.
Anionic Adducts
Sp2-sp3 tetraalkoxy diboron compounds have gained attention due to the development of new, synthetically useful catalytic reactions either with or without transition-metals. Lewis-base adducts of the diboron(4) compounds were suggested as possible intermediates in Cu catalyzed borylation reactions some time ago. However, intermolecular adducts of tetraalkoxy diboron compounds have not been studied yet in great detail. In preliminary studies, we have synthesized a series of anionic sp2-sp3 adducts of B2pin2 with alkoxy-groups (L = [OMe]–, [OtBu]–), a phenoxy-group (L = [4-tBuC6H4O]–) and fluoride (L = [F]–, with [nBu4N]+ as the counter ion) as Lewis-bases.
Neutral Adducts
Since their isolation and characterization, applications of N-heterocyclic carbenes (NHCs) and related molecules, e.g., cyclic alkylaminocarbenes (CAACs) and acyclic diaminocarbenes (aDCs), have grown rapidly. Their use as ligands in homogeneous catalysis and directly in organocatalysis, including recently developed borylation reactions, is now well established. Recently, several examples of ring expansion reactions (RER) involving NHCs were reported to take place at elevated temperatures, involving Be, B, and Si.
Furthermore, preliminary studies in the group of Marder et al. showed the presence of neutral sp2-sp3 diboron compounds with B2pin2 and the NHC Cy2Im. In this work, we focused on the synthesis and characterization of further neutral sp2-sp3 as well as sp3-sp3 diboron adducts with B2cat2 and B2neop2 and different NHCs. Whereas the mono-NHC adduct is stable for several hours at temperatures up to 60 °C, the bis-NHC adducts undergo thermally induced rearrangement to form the ring expanded products compound 26 and 27. B2neop2 is much more reactive than B2cat2 giving ring expanded product 29 at room temperature in quantitative yields, demonstrating that NHC ring expansion and B–B bond cleavage can be very facile processes.
Whereas the mono-NHC adduct is stable for several hours at temperatures up to 60 °C, the bis-NHC adducts undergo thermally induced rearrangement to form the ring expanded products compound 26 and 27. B2neop2 is much more reactive than B2cat2 giving ring expanded product 29 at room temperature in quantitative yields, demonstrating that NHC ring expansion and B–B bond cleavage can be very facile processes.
Background
Herpesviruses can infect a wide range of animal species. Herpes simplex virus 1 (HSV-1) is one of the eight herpesviruses that can infect humans and is prevalent worldwide. Herpesviruses have evolved multiple ways to adapt the infected cells to their needs, but knowledge about these transcriptional and post-transcriptional modifications is sparse.
Results
Here, we show that HSV-1 induces the expression of about 1000 antisense transcripts from the human host cell genome. A subset of these is also activated by the closely related varicella zoster virus. Antisense transcripts originate either at gene promoters or within the gene body, and they show different susceptibility to the inhibition of early and immediate early viral gene expression. Overexpression of the major viral transcription factor ICP4 is sufficient to turn on a subset of antisense transcripts. Histone marks around transcription start sites of HSV-1-induced and constitutively transcribed antisense transcripts are highly similar, indicating that the genetic loci are already poised to transcribe these novel RNAs. Furthermore, an antisense transcript overlapping with the BBC3 gene (also known as PUMA) transcriptionally silences this potent inducer of apoptosis in cis.
Conclusions
We show for the first time that a virus induces widespread antisense transcription of the host cell genome. We provide evidence that HSV-1 uses this to downregulate a strong inducer of apoptosis. Our findings open new perspectives on global and specific alterations of host cell transcription by viruses.
Strong light matter coupling between excitons and microcavity photons, as described in the framework of cavity quantum electrodynamics, leads to the hybridization of light and matter excitations. The regime of collective strong coupling arises, when various excitations from different host media are strongly coupled to the same optical resonance. This leads to a well-controllable admixture of various matter components in three hybrid polariton modes. Here, we study a cavity device with four embedded GaAs quantum wells hosting excitons that are spectrally matched to the A-valley exciton resonance of a MoSe\(_{2}\) monolayer. The formation of hybrid polariton modes is evidenced in momentum resolved photoluminescence and reflectivity studies. We describe the energy and k-vector distribution of exciton-polaritons along the hybrid modes by a thermodynamic model, which yields a very good agreement with the experiment.
Intracellular pathogenic microorganisms and toxins exploit host cell mechanisms to enter, exert their deleterious effects as well as hijack host nutrition for their development. A potential approach to treat multiple pathogen infections and that should not induce drug resistance is the use of small molecules that target host components. We identifed the compound 1-adamantyl (5-bromo-2-methoxybenzyl) amine (ABMA) from a cell-based high throughput screening for its capacity to protect human cells and mice against ricin toxin without toxicity. This compound efciently protects cells against various toxins and pathogens including viruses, intracellular bacteria and parasite. ABMA provokes Rab7-positive late endosomal compartment accumulation in mammalian cells without affecting other organelles (early endosomes, lysosomes, the Golgi apparatus, the endoplasmic reticulum or the nucleus). As the mechanism of action of ABMA is restricted to host-endosomal compartments, it reduces cell infection by pathogens that depend on this pathway to invade cells. ABMA may represent a novel class of broad-spectrum compounds with therapeutic potential against diverse severe infectious diseases.
The MuvB multiprotein complex, together with B-MYB and FOXM1 (MMB-FOXM1), plays an essential role in cell cycle progression by regulating the transcription of genes required for mitosis and cytokinesis. In many tumors, B-MYB and FOXM1 are overexpressed as part of the proliferation signature. However, the transcriptional targets that are important for oncogenesis have not been identified. Given that mitotic kinesins are highly expressed in cancer cells and that selected kinesins have been reported as target genes of MMB-FOXM1, we sought to determine which mitotic kinesins are directly regulated by MMB-FOXM1. We demonstrate that six mitotic kinesins and two microtubule-associated non-motor proteins (MAPs) CEP55 and PRC1 are direct transcriptional targets of MuvB, B-MYB and FOXM1 in breast cancer cells.
Suppression of KIF23 and PRC1 strongly suppressed proliferation of MDA-MB-231 cells. The set of MMB-FOXM1 regulated kinesins genes and 4 additional kinesins which we referred to as the mitotic kinesin signature (MKS) is linked to poor outcome in breast cancer patients. Thus, mitotic kinesins could be used as prognostic biomarker and could be potential therapeutic targets for the treatment of breast cancer.
The field of genetics faces a lot of challenges and opportunities in both research and diagnostics due to the rise of next generation sequencing (NGS), a technology that allows to sequence DNA increasingly fast and cheap.
NGS is not only used to analyze DNA, but also RNA, which is a very similar molecule also present in the cell, in both cases producing large amounts of data.
The big amount of data raises both infrastructure and usability problems, as powerful computing infrastructures are required and there are many manual steps in the data analysis which are complicated to execute.
Both of those problems limit the use of NGS in the clinic and research, by producing a bottleneck both computationally and in terms of manpower, as for many analyses geneticists lack the required computing skills.
Over the course of this thesis we investigated how computer science can help to improve this situation to reduce the complexity of this type of analysis.
We looked at how to make the analysis more accessible to increase the number of people that can perform OMICS data analysis (OMICS groups various genomics data-sources).
To approach this problem, we developed a graphical NGS data analysis pipeline aimed at a diagnostics environment while still being useful in research in close collaboration with the Human Genetics Department at the University of Würzburg.
The pipeline has been used in various research papers on covering subjects, including works with direct author participation in genomics, transcriptomics as well as epigenomics.
To further validate the graphical pipeline, a user survey was carried out which confirmed that it lowers the complexity of OMICS data analysis.
We also studied how the data analysis can be improved in terms of computing infrastructure by improving the performance of certain analysis steps.
We did this both in terms of speed improvements on a single computer (with notably variant calling being faster by up to 18 times), as well as with distributed computing to better use an existing infrastructure.
The improvements were integrated into the previously described graphical pipeline, which itself also was focused on low resource usage.
As a major contribution and to help with future development of parallel and distributed applications, for the usage in genetics or otherwise, we also looked at how to make it easier to develop such applications.
Based on the parallel object programming model (POP), we created a Java language extension called POP-Java, which allows for easy and transparent distribution of objects.
Through this development, we brought the POP model to the cloud, Hadoop clusters and present a new collaborative distributed computing model called FriendComputing.
The advances made in the different domains of this thesis have been published in various works specified in this document.
Most proteins work in aqueous solution and the interaction with water strongly affects their structure and function. However, experimentally the motion of a specific single water molecule is difficult to trace by conventional methods, because they average over the heterogeneous solvation structure of bulk water surrounding the protein. Here, we provide a detailed atomistic picture of the water rearrangement dynamics around the –CONH– peptide linkage in the two model systems formanilide and acetanilide, which simply differ by the presence of a methyl group at the peptide linkage. The combination of picosecond pump–probe time-resolved infrared spectroscopy and molecular dynamics simulations demonstrates that the solvation dynamics at the molecular level is strongly influenced by this small structural difference. The effective timescales for solvent migration triggered by ionization are mainly controlled by the efficiency of the kinetic energy redistribution rather than the shape of the potential energy surface. This approach provides a fundamental understanding of protein hydration and may help to design functional molecules in solution with tailored properties.
Most proteins work in aqueous solution and the interaction with water strongly affects their structure and function. However, experimentally the motion of a specific single water molecule is difficult to trace by conventional methods, because they average over the heterogeneous solvation structure of bulk water surrounding the protein. Here, we provide a detailed atomistic picture of the water rearrangement dynamics around the –CONH– peptide linkage in the two model systems formanilide and acetanilide, which simply differ by the presence of a methyl group at the peptide linkage. The combination of picosecond pump–probe time-resolved infrared spectroscopy and molecular dynamics simulations demonstrates that the solvation dynamics at the molecular level is strongly influenced by this small structural difference. The effective timescales for solvent migration triggered by ionization are mainly controlled by the efficiency of the kinetic energy redistribution rather than the shape of the potential energy surface. This approach provides a fundamental understanding of protein hydration and may help to design functional molecules in solution with tailored properties.
Irritable bowel syndrome (IBS) is a gut-brain disorder involving alterations in intestinal sensitivity and motility. Serotonin 5-HT4 receptors are promising candidates in IBS pathophysiology since they regulate gut motor function and stool consistency, and targeted 5-HT4R selective drug intervention has been proven beneficial in subgroups of patients. We identified a single nucleotide polymorphism (SNP) (rs201253747) c.*61 T > C within the 5-HT4 receptor gene \(HTR4\) to be predominantly present in diarrhoea-IBS patients (IBS-D). It affects a binding site for the miR-16 family and miR-103/miR-107 within the isoforms \({HTR4b/i}\) and putatively impairs \(HTR4\) expression. Subsequent miRNA profiling revealed downregulation of miR-16 and miR-103 in the jejunum of IBS-D patients correlating with symptoms. \(In\) \(vitro\) assays confirmed expression regulation via three 3′UTR binding sites. The novel isoform \(HTR4b\_2\) lacking two of the three miRNA binding sites escapes miR-16/103/107 regulationin SNP carriers. We provide the first evidence that \(HTR4\) expression is fine-tuned by miRNAs, and that this regulation is impaired either by the SNP c.*61 T > C or bydiminished levels of miR-16 and miR-103 suggesting that \(HTR4\) might be involved in the development of IBS-D.
Archäologische Gläser können verschiedene Korrosionsphänomene aufweisen, die häufig mit der Ausbildung von Brüchen und Mikrorissen einhergehen. Ein besonders schwerwiegendes Korrosionsphänomen an Glasartefakten wird unter Archäologen als „sugaring“ bezeichnet. Die betroffenen Gläser weisen korrosionsbedingt eine ausgesprochen kleinteilige Fragmentierung auf, die im Extremfall an Zuckerkristalle erinnert.
Im Rahmen der Dissertation erfolgte eine genaue Schadensbeschreibung und Schadensuntersuchung an geschädigten archäologischen Gläsern und Fensterglas mittels Lichtmikroskopie und Rasterelektronenmikroskopie (REM-EDX).
Aufbauend auf den Untersuchungen an Originalgläsern wurden Modellgläser nachgeschmolzen und in Laborversuchen unter verschiedenen Bedingungen künstlich bewittert. Ziel war es mögliche Einflussfaktoren für die Ausbildung des Schadens zu bestimmen – wie den Einfluss von wässrigen Lösungen mit unterschiedlichen pH-Werten, Feuchtigkeitsschwankungen, unterschiedliche Oberflächeneigenschaften des Glases bzw. die Materialstärke. Die Ergebnisse zeigen, dass vor allem das Vorhandensein von Wasser bzw. Feuchtigkeit der dominierende Parameter ist, der die Schadensentwicklung beeinflusst.
Social life is organized around rules and norms. The present experiments investigate the cognitive architecture of rule violations. To do so, a setting with arbitrary rules that had to be followed or broken was developed, and breaking these rules did not have any negative consequences. Removed from any social influences that might further encourage or hinder the rule breaker, results suggest that simply labeling a behavior as a rule violation comes with specific costs: They are more difficult to plan and come with specific behavioral markers during execution. In essence, rule violations resemble rule negations, but they also trigger additional processes.
The question of what makes rule violations more difficult than rule inversions is the major focus of the remaining experiments. These experiments revealed negative affective consequences of rule violation and rule inversions alike, while rule violations additionally prime authority-related concepts, thus sensitizing towards authority related stimuli.
Next, the question how these burdens of non-conformity can be mitigated was investigated, and the influence of having executed the behavior in question frequently and recently was tested in both negations and rule violations. The burdens of non-conformity can best be reduced by a combination of having violated/negated a rule very frequently and very recently. Transfer from another task, however, could not be identified.
To conclude, a model that accounts for the data that is currently presented is proposed. As a variant of a task switching model, it describes the cognitive processes that were investigated and highlights unique processing steps that rule violations seem to require.
In einem internen Studie wurde der Langzeiterfolg der Methode der oszillierenden retrograden Wurzelkanalaufbereitung mithilfe von Schall- oder Ultraschalltechnologie mit der rotierenden Methode mit Mikrorosenbohrern verglichen. Die Erfolgsauswertung erfolgte retrospektiv nach klinischen und radiologischen Kriterien. Untersucht wurden insgesamt 378 Prämolaren, 185 für die oszillierende und 193 für die rotierende Methode, die vom selben Behandler unter einheitlichen technischen und anatomischen Bedingungen sowie unter einheitlichen Operations- und Qualitätsstandards operiert wurden. Die Erfolgswahrscheinlichkeit der oszillierenden Kanalaufbereitung betrug nach einem Jahr 91,2%, nach zwei Jahren 89,4%, nach drei Jahren 86,3%, nach fünf Jahren 79,1% sowie nach acht Jahre 76,5%. Die Erfolgswahrscheinlichkeit der oszillierenden Kanalaufbereitung betrug nach einem Jahr 88,3%, nach zwei Jahren 85,4%, nach drei Jahren 80,6%, nach fünf Jahren 64,9% sowie nach acht Jahre 53,9%. Die Methode der oszillierenden Kanalaufbereitung zeigte zu jeden Zeitpunkt der Untersuchung eine höhere Erfolgswahrscheinlichkeit als die Methode der rotierende Kanalaufbereitung.
Driving simulators are powerful research tools. Countless simulator studies have contributed to traffic safety over the last decades. Constant improvements in simulator technology call for a measureable scale to assess driving simulators with regard to their utility in human factors research. A promising psychological construct to do so is presence. It is commonly defined as the feeling of being located in a remote or virtual environment that seems to be real. Another aspect of presence describes the ability to act there successfully.
The main aim of this thesis is to develop a presence model dedicated to the application in driving simulators. Established models have been combined and extended in order to gain a comprehensive model of presence that allows understanding its emergence and deriving recommendations on how to design or improve driving simulators. The five studies presented in this thesis investigate specific postulated model components and their interactions. All studies deal with motorcycling or a motorcycle riding simulator as exemplary field of application.
The first study used a speed estimation task to investigate the contribution of different sensory cues to presence. While visualization plays a particularly important role, further improvements could be achieved by adding more consistent sensory stimuli to the virtual environment. Auditory, proprioceptive and vestibular cues have been subject to investigation. In the second study, the speed production method was applied. It confirmed the positive contribution of action to presence as predicted by psychocybernetic models. The third study dealt with the effect of training on presence. Hence, no positive effect was observed. The fourth study aimed at replicating previous findings on sensory fidelity and diversity in a more complex riding situation than only longitudinal vehicle control. The riders had to cross an unexpectedly appearing deep pit with the virtual motorcycle. The contribution of more consistent sensory stimulation on presence was successfully shown in this scenario, too. The final study was a real riding experiment that delivered reference values for the speed estimation capabilities of motorcycle riders. Besides higher variations in the simulator data, the general speed estimation performance was on a comparable level. Different measures, such as subjective ratings, behavioral responses, performance, and physiological reactions, have been applied as presence indicators.
These studies’ findings deliver evidence for the meaningful application of the proposed presence model in driving simulator settings. The results suggest that presence can be interpreted as a quality measure for perception in virtual environments. In line with psychocybernetic models, taking action, which is seen as controlling perception, enhances this quality even further. Describing the psychological construct of presence in a theoretical framework that takes the diversity of perception and action in driving simulator settings into account closes a gap in traffic psychological research.
Alkoholabhängigkeit ist weltweit ein prävalentes Problem und Alkohol-Craving stellt einen wichtigen Faktor für die Entstehung und Aufrechterhaltung der Abhängigkeit und für einen Rückfall dar. Craving kann mithilfe subjektiver Messmethoden, bildgebenden Verfahren und mithilfe der Cue-Reaktivität gemessen werden. Ein Paradigma hierfür ist die Messung der Alkohol-Cue-Reaktivität mithilfe des akustisch induzierten Startle Reflexes während der Präsentation alkoholrelevanter und anderer emotional erregender Bilder.
Bei alkoholabhängigen Patienten wurde eine erhöhte Aktivität des Dorsolateralen Präfrontalen Kortex (DLPFC) beobachtet, einem Hirnareal, das für exekutive Funktionen zuständig ist und dem eine große Rolle im Prozess des Cravings zugeschrieben wird. In der Literatur wurde gezeigt, dass eine veränderte Aktivität im DLPFC mit einem erhöhten Craving einhergeht. Zur Modulation der Aktivität des DLPFC kann die transkranielle Gleichstromstimulation (tDCS), eine Form der nichtinvasiven Neurostimulation, eingesetzt werden. Hierbei führt eine kathodale tDC Stimulation zu einer Verringerung der neuronalen Exzitabilität, während anodale Stimulation diese steigert. In unserer Studie sollte überprüft werden, ob durch die Modulation der Aktivität in Richtung einer Inaktivierung des DLPFC die Cue Reaktivität auf Alkoholreize im Startle Test verändert werden kann und das Craving hierdurch reduziert werden kann. Hierfür wurde eine kathodale Stimulation gewählt.
In einer doppelblinden randomisiert-kontrollierten Studie untersuchten wir den Effekt von tDCS an 30 alkoholabhängigen stationären Patienten, die sich direkt nach dem akuten Entzug befanden. Die Probanden wurden zwei Gruppen randomisiert zugeteilt, eine Gruppe mit links kathodaler Verum-Stimulation und eine Gruppe mit Sham-Stimulation. Während einer 20-minütigen tDCS-Stimulation über dem DLPFC wurden emotional positive, neutrale und negative Bilder sowie Alkohol-Bilder präsentiert und parallel der akustische Startle-Response gemessen.
In unserer Untersuchung konnte gezeigt werden, dass Alkohol-Bilder im Startle Test aversiv verarbeitet werden. Zudem konnte ein signifikanter Effekt der tDCS Intervention gezeigt werden. TDCS führte zu einer noch negativeren Modulation des Startle Responses. Auch für das subjektive Craving konnte ein mittlerer Effekt in Richtung einer Reduktion des Cravings durch tDCS gezeigt werden. Im subjektiven Bilder-Rating nach Arousal zeigte sich ein appetitiver Effekt von Alkoholreizen, jedoch kein Effekt durch die Intervention.
Zusammenfassend konnte diese Studie einen signifikanten Effekt durch transkranielle Stimulation mit tDCS auf die Cue-Reaktivität alkoholrelevanter Reize und das subjektive Craving zeigen und unterstreicht damit die Wirksamkeit der tDC Stimulation als neuromodulatorische Methode. Dies eröffnet neue Perspektiven für die zukünftige Modulation des Cravings durch eine Veränderung der neuronalen Exzitabilität. Trotzdem werden weitere Studien notwendig sein, die den Effekt der tDCS auf die Cue-Reaktivität und das Craving prüfen. Zudem wäre es wichtig, standardisierte Stimulations- und Messprotokolle zu entwickeln, um eine bessere Vergleichbarkeit der Studien zu ermöglichen. Das Ziel weiterer Untersuchungen könnte sein, die tDCS als mögliche Therapieoption zur Unterstützung der Therapie bei Alkoholabhängigkeit in den klinischen Einsatz zu etablieren. Hierzu werden multimodale klinische Therapiestudien nötig sein, die den praktischen Einsatz in der Klinik und zudem Langzeiteffekte prüfen.
Diese Studie möchte dazu beitragen, das Phänomen des Alkohol-Cravings und der Cue-Reaktivität besser zu verstehen, die tDCS als neue Herangehensweise zur Reduktion des Cravings zu überprüfen und langfristig die Therapie der Alkoholabhängigkeit zu verbessern.
Background
40–50% of patients with colorectal cancer (CRC) will develop liver metastases (CRLM) during the course of the disease. One third of these patients will additionally develop pulmonary metastases.
Methods
137 consecutive patients with CRLM, were analyzed regarding survival data, clinical, histological data and treatment. Results were stratified according to the occurrence of pulmonary metastases and metastases resection.
Results
39% of all patients with liver resection due to CRLM developed additional lung metastases. 44% of these patients underwent subsequent pulmonary resection. Patients undergoing pulmonary metastasectomy showed a significantly better five-year survival compared to patients not qualified for curative resection (5-year survival 71.2% vs. 28.0%; p = 0.001). Interestingly, the 5-year survival of these patients was even superior to all patients with CRLM, who did not develop pulmonary metastases (77.5% vs. 63.5%; p = 0.015). Patients, whose pulmonary metastases were not resected, were more likely to redevelop liver metastases (50.0% vs 78.6%; p = 0.034). However, the rate of distant metastases did not differ between both groups (54.5 vs.53.6; p = 0.945).
Conclusion
The occurrence of colorectal lung metastases after curative liver resection does not impact patient survival if pulmonary metastasectomy is feasible. Those patients clearly benefit from repeated resections of the liver and the lung metastases.
Colorectal carcinoma (CRC) is the most common cancer of the gastrointestinal tract with frequently dysregulated intracellular signaling pathways, including p53 signaling. The mainstay of chemotherapy treatment of CRC is 5-fluorouracil (5FU) and oxaliplatin. The two anticancer drugs mediate their therapeutic effect via DNA damage-triggered signaling. The small molecule reactivating p53 and inducing tumor apoptosis (RITA) is described as an activator of wild-type and reactivator of mutant p53 function, resulting in elevated levels of p53 protein, cell growth arrest, and cell death. Additionally, it has been shown that RITA can induce DNA damage signaling. It is expected that the therapeutic benefits of 5FU and oxaliplatin can be increased by enhancing DNA damage signaling pathways. Therefore, we highlighted the antiproliferative response of RITA alone and in combination with 5FU or oxaliplatin in human CRC cells. A panel of long-term established CRC cell lines (n = 9) including p53 wild-type, p53 mutant, and p53 null and primary patient-derived, low-passage cell lines (n = 5) with different p53 protein status were used for this study. A substantial number of CRC cells with pronounced sensitivity to RITA (IC\(_{50}\)< 3.0 μmol/l) were identified within established (4/9) and primary patient-derived (2/5) CRC cell lines harboring wild-type or mutant p53 protein. Sensitivity to RITA appeared independent of p53 status and was associated with an increase in antiproliferative response to 5FU and oxaliplatin, a transcriptional increase of p53 targets p21 and NOXA, and a decrease in MYC mRNA. The effect of RITA as an inducer of DNA damage was shown by a strong elevation of phosphorylated histone variant H2A.X, which was restricted to RITA-sensitive cells. Our data underline the primary effect of RITA, inducing DNA damage, and demonstrate the differential antiproliferative effect of RITA to CRC cells independent of p53 protein status. We found a substantial number of RITA-sensitive CRC cells within both panels of established CRC cell lines and primary patient-derived CRC cell lines (6/14) that provide a rationale for combining RITA with 5FU or oxaliplatin to enhance the antiproliferative response to both chemotherapeutic agents.
Die Ableitung Akustisch evozierter Potentiale (AEP) durch intraoperatives Monitoring wird regelhaft bei der Operation von Vestibularisschwannomen mit dem Ziel des Hörerhaltes durchgeführt.
Trotz AEP-Erhalt am Ende der Operation wurden Fälle mit postoperativer Taubheit beobachtet. Bisher ist es unklar, ob es sich um falsch positive AEP-Befunde oder Fälle von sekundärer Taubheit handelt.
Diese Pilotstudie, bei der zu definierten Zeitpunkten postoperativ AEP-Messungen durchgeführt wurden, zeigt erhebliche Veränderungen der AEP-Befunde im postoperativen Verlauf. Es fanden sich Patienten mit verbesserten AEP-Befunden, aber auch verschlechterten AEP bis zum vollständigen Verlust aller AEP-Komponenten.
Ob ein sekundärer Hörverlust durch frühzeitiges Erkennen von AEP-Veränderungen verhindert werden kann, wird Inhalt von weiteren Studien sein.
The transcriptome is a powerful proxy for the physiological state of a cell, healthy or diseased. As a result, transcriptome analysis has become a key tool in understanding the molecular changes that accompany bacterial infections of eukaryotic cells. Until recently, such transcriptomic studies have been technically limited to analyzing mRNA expression changes in either the bacterial pathogen or the infected eukaryotic host cell. However, the increasing sensitivity of high-throughput RNA sequencing now enables “dual RNA-seq” studies, simultaneously capturing all classes of coding and noncoding transcripts in both the pathogen and the host. In the five years since the concept of dual RNA-seq was introduced, the technique has been applied to a range of infection models. This has not only led to a better understanding of the physiological changes in pathogen and host during the course of an infection but has also revealed hidden molecular phenotypes of virulence-associated small noncoding RNAs that were not visible in standard infection assays. Here, we use the knowledge gained from these recent studies to suggest experimental and computational guidelines for the design of future dual RNA-seq studies. We conclude this review by discussing prospective applications of the technique.
Introduction: The prognosis of medullary thyroid carcinoma (MTC) is poor using common chemotherapeutic approaches. However, during the last years encouraging results of recently introduced tyrosine kinase inhibitors (TKI) such as vandetanib have been published. In this study we aimed to correlate the results of \(^{18}\)F-fluorodeoxyglucose ([\(^{18}\)F]FDG) positron emission tomography (PET) imaging with treatment outcome.
Methods: Eighteen patients after thyroidectomy with recurrent/advanced MTC lesions receiving vandetanib (300 mg orally/day) could be analysed. A baseline \(^{18}\)F-FDG PET prior to and a follow-up \(^{18}\)F-FDG PET 3 months after TKI initiation were performed. During follow-up, tumor progression was assessed every 3 months including computed tomography according to RECIST. Progression-free survival (PFS) was correlated with the maximum standardized uptake value of \(^{18}\)F-FDG in lymph nodes (SUV(LN)max) or visceral metastases (SUV(MTS)max) as well as with clinical parameters using ROC analysis.
Results: Within median 3.6 years of follow-up, 9 patients showed disease progression at median 8.5 months after TKI initiation. An elevated glucose consumption assessed by baseline \(^{18}\)F-FDG PET (SUV(LN)max > 7.25) could predict a shorter PFS (2 y) with an accuracy of 76.5% (SUV(LN)max <7.25, 4.3 y; p=0.03). Accordingly, preserved tumor metabolism in the follow-up PET (SUV(MTS)max >2.7) also demonstrated an unfavorable prognosis (accuracy, 85.7%). On the other hand, none of the clinical parameters reached significance in response prediction.
Conclusions: In patients with advanced and progressive MTC, tumors with higher metabolic activity at baseline are more aggressive and more prone to progression as reflected by a shorter PFS; they should be monitored more closely. Preserved glucose consumption 3 months after treatment initiation was also related to poorer prognosis.
Einleitung: Die linksventrikuläre diastolische Dysfunktion (LVDD) ist bei Diabetikern noch vor Entwicklung einer klinisch apparenten Herzinsuffizienz eines der ersten Anzeichen einer kardialen Beteiligung. Daher soll in dieser Studie untersucht werden, ob die LVDD mit ECG-gated F-18-FDG PET in einem Diabetes-Rattenmodell dargestellt werden kann.
Methodik: Es wurden F-18-FDG PET Scans in einem Typ-2-Diabetes Rattenmodell (ZDF fa/fa, n=6) und in ZL Kontrollen (n=6) vorgenommen (Alter, jeweils 13 Wochen). Unter Hyperinsulinemic-Euglycemic Clamp-Technik wurden 37 MBq 18F-FDG über die Schwanzvene appliziert. 15-35 Minuten nach Tracergabe wurden mittels eines Kleintier-PET-Scanners sowie unter EKG-Ableitung PET Scans angefertigt (16 frames/cardiac cycle). Die linksventrikuläre Ejektionsfraktion (EF) und die Peak Füllrate (PFR) wurden mittels einer geeigneten Software (Heart Function View) gemessen, wobei die Software an die Größe des Rattenherzes angepasst wurde.
Ergebnisse: Im Alter von 13 Wochen entwickeln ZDF Diabetes-Ratten eine im Vergleich zu Kontrolltieren eine signifikante myokardiale Hypertrophie, bestätigt durch post-mortem Analyse des Herzgewichtes (994±78mg vs. 871±44mg in ZDF Diabetes-Ratten vs. ZL Kontrollen, p<0.01). ECG-gated PET zeigte eine signifikante Abnahme der LV diastolischen PFR (10.4±0.5 vs. 11.8±0.4 EDV/sec in ZDF Diabetes-Ratten vs. ZL Kontrollen, p<0.001), jedoch zeigte sich kein signifikanter Unterschied zwischen LVEF und der Herzfrequenz in den untersuchten ZDF Diabetes-Ratten und Kontrollen (LVEF: 60.0±4.5 vs. 63.7±4.1%, n.s. und HR: 305±25 vs. 323±24 bpm, n.s.).
Schlussfolgerung: Im Diabetes-Ratten-Modell kann unter Verwendung eines ECG-gated FDG-PET Protokolls die diastolische Dysfunktion als Parameter der frühen diabetischen Kardiomyopathie nachgewiesen werden.
C-X-C motif chemokine receptor 4 (CXCR4) and somatostatin receptors (SSTR) are overexpressed in gastro-entero-pancreatic neuroendocrine tumors (GEP-NET). In this study, we aimed to elucidate the feasibility of non-invasive CXCR4 positron emission tomography/computed tomography (PET/CT) imaging in GEP-NET patients using [\(^{68}\)Ga]Pentixafor in comparison to \(^{68}\)Ga-DOTA-D-Phe-Tyr3-octreotide ([\(^{68}\)Ga]DOTATOC) and \(^{18}\)F-fluorodeoxyglucose ([\(^{18}\)F]FDG). Twelve patients with histologically proven GEP-NET (3xG1, 4xG2, 5xG3) underwent [\(^{68}\)Ga]DOTATOC, [\(^{18}\)F]FDG, and [\(^{68}\)Ga]Pentixafor PET/CT for staging and planning of the therapeutic management. Scans were analyzed on a patient as well as on a lesion basis and compared to immunohistochemical staining patterns of CXCR4 and somatostatin receptors SSTR2a and SSTR5. [\(^{68}\)Ga]Pentixafor visualized tumor lesions in 6/12 subjects, whereas [\(^{18}\)F]FDG revealed sites of disease in 10/12 and [\(^{68}\)Ga]DOTATOC in 11/12 patients, respectively. Regarding sensitivity, SSTR-directed PET was the superior imaging modality in all G1 and G2 NET. CXCR4-directed PET was negative in all G1 NET. In contrast, 50% of G2 and 80% of G3 patients exhibited [\(^{68}\)Ga]Pentixafor-positive tumor lesions. Whereas CXCR4 seems to play only a limited role in detecting well-differentiated NET, increasing receptor expression could be non-invasively observed with increasing tumor grade. Thus, [\(^{68}\)Ga]Pentixafor PET/CT might serve as non-invasive read-out for evaluating the possibility of CXCR4-directed endoradiotherapy in advanced dedifferentiated SSTR-negative tumors.
Objective: Radiotracers targeting prostate-specific membrane antigen (PSMA) have increasingly been recognized as showing uptake in a number of normal structures, anatomic variants, and non-prostate-cancer pathologies. We aimed to explore the frequency and degree of uptake in peripheral ganglia in patients undergoing PET with the PSMA-targeted agent \(^{18}\)F-DCFPyL.
Methods: A total of 98 patients who underwent \(^{18}\)F-DCFPyL PET/CT imaging were retrospectively analyzed. This included 76 men with prostate cancer (PCa) and 22 patients with renal cell carcinoma (RCC; 13 men, 9 women). Scans were evaluated for uptake in the cervical, stellate, celiac, lumbar and sacral ganglia. Maximum standardized uptake value corrected to body weight (SUV\(_{max}\)), and maximum standardized uptake value corrected to lean body mass (SUL\(_{max}\)) were recorded for all ganglia with visible uptake above background. Ganglia-to-background ratios were calculated by dividing the SUV\(_{max}\) and SUL\(_{max}\) values by the mean uptake in the ascending aorta (Aortamean) and the right gluteus muscle (Gluteusmean).
Results: Overall, 95 of 98 (96.9%) patients demonstrated uptake in at least one of the evaluated peripheral ganglia. With regard to the PCa cohort, the most frequent sites of radiotracer accumulation were lumbar ganglia (55/76, 72.4%), followed by the cervical ganglia (51/76, 67.1%). Bilateral uptake was found in the majority of cases [lumbar 44/55 (80%) and cervical 30/51 (58.8%)]. Additionally, discernible radiotracer uptake was recorded in 50/76 (65.8%) of the analyzed stellate ganglia and in 45/76 (59.2%) of the celiac ganglia, whereas only 5/76 (6.6%) of the sacral ganglia demonstrated \(^{18}\)F-DCFPyL accumulation. Similar findings were observed for patients with RCC, with the most frequent locations of radiotracer uptake in both the lumbar (20/22, 90.9%) and cervical ganglia (19/ 22, 86.4%). No laterality preference was found in mean PSMA-ligand uptake for either the PCa or RCC cohorts.
Conclusion: As PSMA-targeted agents become more widely disseminated, the patterns of uptake in structures that are not directly relevant to patients’ cancers must be understood. This is the first systematic evaluation of the uptake of \(^{18}\)F-DCFPyL in ganglia demonstrating a general trend with a descending frequency of radiotracer accumulation in lumbar, cervical, stellate, celiac, and sacral ganglia. The underlying biology that leads to variability of PSMA-targeted radiotracers in peripheral ganglia is not currently understood, but may provide opportunities for future research.
Die T1-Relaxationszeiten der gesunden Kontrollgruppe (Reifgeborene) lag durchschnittlich bei 662 ± 55 ms bei Raumluft und 591 ± 48 ms bei reinem Sauerstoff, die relativen Differenzen bei 10,7 ± 2,3 %. Dies deckt sich mit in der Literatur angegebenen Werten. Die relative Differenz gibt Aufschluss über den Sauerstofftransfer im Blut: je mehr Sauerstoff gelöst im Blut vorliegt, desto niedriger wird der T1-Wert und desto höher die absolute Differenz. Bei der Gruppe der Frühgeborenen mit BPD (Bronchopulmonale Dysplasie) zeigte sich eine geringere relative Differenz (Mittelwert = 9,2 +/- 3,1%) im Vergleich zu dem Mittelwert der Frühgeborenen ohne BPD (10,8 +/- 3,0%) sowie der Reifgeborenen (10,7 +/-2,3%), was auf einen geringeren Sauerstofftransfer in der Lunge schließen lässt. Bei statistischer Auswertung der einzelnen Schichten zeigte sich lediglich in der medialen linken Schicht ein signifikanter Unterschied der relativen Differenz der T1-Werte. Die Differenz war in der Gruppe der Frühgeborenen mit BPD signifikant niedriger als in der Gruppe der Frühgeborenen ohne BPD bzw. der Kontrollgruppe. Bei den ausgewerteten T1-Karten konnten keine lokalen Auffälligkeiten festgestellt werden. Auch morphologisch ergaben sich keinerlei Auffälligkeiten. Es scheint ein globales Problem im Sauerstofftransfer vorzuliegen.
Die Ergebnisse legen nahe, dass bei Kindern, die nach Geburt an einer schweren Form der BPD erkrankt sind, bis zumindest ins Schulkindesalter ein persistierend gestörter Sauerstofftransfer im Lungenparenchym gegeben ist. Diese funktionelle Einschränkung betrifft die gesamte Lunge, die höheren Abweichungen der Messergebnisse in einzelnen Lungenabschnitten bei den ehemaligen Frühgeborenen mit BPD legen eine höhere regionale Diversität nahe. Bei Frühgeborenen ohne chronische Lungenerkrankung sind in MRT-Messungen keine Unterschiede zu Reifgeborenen nachzuweisen. Es ist also anzunehmen, dass nicht allein durch die Frühgeburtlichkeit und das geringe Geburtsgewicht eine obstruktive Einschränkung in der Lungenfunktion als Langzeitfolge im Kindesalter weiter fort besteht, sondern der Faktor der BPD zusätzlich zu einem verminderten Gastransfer in der Lunge führt, welcher am ehesten durch eine verminderte Alveolarisierung und Vaskularisation in der Lunge bedingt ist.
Plants have to tightly control their energy homeostasis to ensure survival and fitness under constantly changing environmental conditions. Thus, it is stringently required that energy-consuming stress-adaptation and growth-related processes are dynamically tuned according to the prevailing energy availability. The evolutionary conserved SUCROSE NON-FERMENTING1 RELATED KINASES1 (SnRK1) and the downstream group C/S\(_{1}\) basic leucine zipper (bZIP) transcription factors (TFs) are well-characterised central players in plants’ low-energy management. Nevertheless, mechanistic insights into plant growth control under energy deprived conditions remains largely elusive. In this work, we disclose the novel function of the low-energy activated group S\(_{1}\) bZIP11-related TFs as regulators of auxin-mediated primary root growth. Whereas transgenic gain-of-function approaches of these bZIPs interfere with the activity of the root apical meristem and result in root growth repression, root growth of loss-of-function plants show a pronounced insensitivity to low-energy conditions. Based on ensuing molecular and biochemical analyses, we propose a mechanistic model, in which bZIP11-related TFs gain control over the root meristem by directly activating IAA3/SHY2 transcription. IAA3/SHY2 is a pivotal negative regulator of root growth, which has been demonstrated to efficiently repress transcription of major auxin transport facilitators of the PIN-FORMED (PIN) gene family, thereby restricting polar auxin transport to the root tip and in consequence auxin-driven primary root growth. Taken together, our results disclose the central low-energy activated SnRK1-C/S\(_{1}\)-bZIP signalling module as gateway to integrate information on the plant’s energy status into root meristem control, thereby balancing plant growth and cellular energy resources.
Rassismus wirkt in der Schule auf individueller, unterrichtlicher und institutioneller Ebene – häufig in subtilen und versteckten Formen. Zwar besitzt das Phänomen einen spezifischen historischen Ausgangspunkt und ist dadurch in seinen Wirkungsweisen (gerade auch in pädagogischen Kontexten) gut zu analysieren und somit folglich auch zu dekonstruieren, allerdings stößt die für eine pädagogische Auseinandersetzung zentrale Voraussetzung einer selbst- und machtreflexiven Herangehensweise bei Pädagoginnen häufig auf Widerstände und Ablehnung. Auch aufgrund der langjährigen Tabuisierung des Begriffs fand eine intensivere Auseinandersetzung mit Rassismus im deutschsprachigen Raum sowohl in der erziehungswissenschaftlichen Theorie wie auch in der pädagogischen Praxis erst ab den 1990er-Jahren statt. Bis heute besteht allerdings ein virulenter Forschungsbedarf für dieses Praxis- und Forschungsfeld in der spezifischen Schnittmenge der Gegenstandsbereiche Lehrerinnenfortbildung und Rassismus.
Die hier vorgelegte explorative Studie hatte zum Ziel, dieses Forschungsdefizit aufzuholen und beschäftigte sich deshalb mit der aktuellen Praxis der rassismusrelevanten Lehrerinnen- und Lehrerfortbildung in Deutschland, d.h. mit jenen Konzepten und Angeboten der sogenannten Dritten Phase, in welchen das Thema ‚Rassismus‘ eine explizite wie implizite inhaltliche Relevanz besitzt. Eine empirische Datenbasis konnte auf Grundlage von qualitativen Interviews mit Expertinnen, die für die Konzeption und/oder Durchführung solcher Fortbildungen verantwortlich sind, erhoben und mit Hilfe der Qualitativen Inhaltsanalyse ausgewertet werden. Durch eine Verdichtung des analysierten Materials konnten am Ende des Auswertungsprozesses fünf Kernhypothesen formuliert werden, welche belastbare Aussagen zur aktuellen Praxis der rassismusspezifischen Lehrerinnenfortbildung – also jener Seminare, in denen Rassismus explizit thematisiert wird – darstellen und somit Anknüpfungspunkte für möglichen Folgestudien bieten.
Neuerungen in Bildungssystemen können nur erfolgreich sein, wenn sie planmäßig implementiert werden. Maßgeblich ist hierfür, dass die Lehrkräfte über die entsprechenden professionellen Kompetenzen verfügen. Die vorliegende Arbeit untersucht diesen Zusammenhang am Beispiel der Implementation von Seminarfächern im bayerischem Gymnasium. Es wird identifiziert, welche neuen Herausforderungen Chemie-Lehrkräfte mit Einführung der Wissenschaftspropädeutischen (W-) und Projekt-Seminare (P-) bewältigen müssen. Aus Interviews mit Lehrkräften wurden per qualitativer Inhaltsanalyse nach Mayring die Anforderungen an das Professionswissen der Lehrkräfte identifiziert. Für die W-Seminare konnte dargestellt werden, dass eine erfolgreiche Wissenschaftspropädeutik häufig an fehlendem Fachwissen der Lehrkräfte zu Nature of Science Inquiry (NOSI) scheiterte. Analog fehlte den Lehrkräften in den P-Seminaren Fachwissen zu Projektmanagement, sodass sie dies weder umsetzten, noch erfolgreich vermitteln konnten. Um die Lehrkräfte bei der Bewältigung der Herausforderungen zu unterstützen, wurden vielfältige Möglichkeiten der Kooperation von Seminarfächern mit der Universität als externem Partner erprobt. Methodenwerkzeuge für eine systematische Wissenschaftspropädeutik wurden entwickelt und im Rahmen von Lehrerfortbildungen weitergegeben. Weiterhin wurde ein Lehr-Lern-Labor „Analyseverfahren der Chemie“ für W-Seminare konzipiert und wiederholt erfolgreich durchgeführt. Damit wurden Erkenntnisse der empirischen Studie in nachweislich praxistaugliche Konzepte umgesetzt, die die erfolgreiche Implementation der Seminarfächer unterstützen können.
Somatic mutations in protein kinase A catalytic α subunit (PRKACA) were found to be causative for 30-40% of cortisol-producing adenomas (CPA) of the adrenal gland, rendering PKA signalling constitutively active. In its resting state, PKA is a stable and inactive heterotetramer, consisting of two catalytic and two regulatory subunits with the latter inhibiting PKA activity. The human genome encodes three different PKA catalytic subunits and four different regulatory subunits that are preferentially expressed in different organs. In normal adrenal glands all regulatory subunits are expressed, while CPA exhibit reduced protein levels of the regulatory subunit IIβ. In this study, we linked for the first time the loss of RIIβ protein levels to the PRKACA mutation status and found the down-regulation of RIIβ to arise post-transcriptionally. We further found the PKA subunit expression pattern of different tumours is also present in the zones of the normal adrenal cortex and demonstrate that the different PKA subunits have a differential expression pattern in each zone of the normal adrenal gland, indicating potential specific roles of these subunits in the regulation of different hormones secretion.
TP53 mutations have been associated with anaplasia in Wilms tumour, which conveys a high risk for relapse and fatal outcome. Nevertheless, TP53 alterations have been reported in no more than 60% of anaplastic tumours, and recent data have suggested their presence in tumours that do not fulfil the criteria for anaplasia, questioning the clinical utility of TP53 analysis. Therefore, we characterized the TP53 status in 84 fatal cases of Wilms tumour, irrespective of histological subtype. We identified TP53 alterations in at least 90% of fatal cases of anaplastic Wilms tumour, and even more when diffuse anaplasia was present, indicating a very strong if not absolute coupling between anaplasia and deregulation of p53 function. Unfortunately, TP53 mutations do not provide additional predictive value in anaplastic tumours since the same mutation rate was found in a cohort of non-fatal anaplastic tumours. When classified according to tumour stage, patients with stage I diffuse anaplastic tumours still had a high chance of survival (87%), but this rate dropped to 26% for stages II–IV. Thus, volume of anaplasia or possible spread may turn out to be critical parameters. Importantly, among non-anaplastic fatal tumours, 26% had TP53 alterations, indicating that TP53 screening may identify additional cases at risk. Several of these non-anaplastic tumours fulfilled some criteria for anaplasia, for example nuclear unrest, suggesting that such partial phenotypes should be under special scrutiny to enhance detection of high-risk tumours via TP53 screening. A major drawback is that these alterations are secondary changes that occur only later in tumour development, leading to striking intratumour heterogeneity that requires multiple biopsies and analysis guided by histological criteria. In conclusion, we found a very close correlation between histological signs of anaplasia and TP53 alterations. The latter may precede development of anaplasia and thereby provide diagnostic value pointing towards aggressive disease.
The regulation of replication is essential to preserve genome integrity. Mms1 is part of the E3 ubiquitin ligase complex that is linked to replication fork progression. By identifying Mms1 binding sites genome-wide in Saccharomyces cerevisiae we connected Mms1 function to genome integrity and replication fork progression at particular G-rich motifs. This motif can form G-quadruplex (G4) structures in vitro. G4 are stable DNA structures that are known to impede replication fork progression. In the absence of Mms1, genome stability is at risk at these G-rich/G4 regions as demonstrated by gross chromosomal rearrangement assays. Mms1 binds throughout the cell cycle to these G-rich/G4 regions and supports the binding of Pif1 DNA helicase. Based on these data we propose a mechanistic model in which Mms1 binds to specific G-rich/G4 motif located on the lagging strand template for DNA replication and supports Pif1 function, DNA replication and genome integrity.
Previous studies have shown that ingroup/outgroup membership influences individual’s fairness considerations. However, it is not clear yet how group membership influences brain activity when a recipient evaluates the fairness of asset distribution. In this study, subjects participated as recipients in an Ultimatum Game with alleged members of both an experimentally induced ingroup and outgroup. They either received extremely unequal, moderately unequal, or equal offers from proposers while electroencephalogram was recorded. Behavioral results showed that the acceptance rates for unequal offers were higher when interacting with ingroup partners than with outgroup partners. Analyses of event related potentials revealed that proposers’ group membership modulated offer evaluation at earlier processing stages. Feedback-related negativity was more negative for extremely and moderately unequal offers compared to equal offers in the ingroup interaction whereas it did not show differential responses to different offers in the outgroup interaction. Analyses of event related oscillations revealed that the theta power (4–6 Hz) was larger for moderately unequal offers than equal offers in the ingroup interaction whereas it did not show differential responses to different offers in the outgroup interaction. Thus, early mechanisms of fairness evaluation are strongly modulated by the ingroup/outgroup membership of the interaction partner.
Upon complexation to CuOTf, a PMe\(_3\)-stabilized bis(9-anthryl) diborene slowly undergoes an intramolecular hydroarylation reaction at room temperature. Subsequent triflation of the B–H bond with CuOTf, followed by a PMe\(_3\) transfer, finally yields a cyclic sp\(^2\)-sp\(^3\) boryl-substituted boronium triflate salt.
Despite the prevalence of stable π-complexes of most d\(^{10}\) metals, such as Cu(I) and Ni(0), with ethylene and other olefins, complexation of d\(^{10}\) Zn(II) to simple olefins is too weak to form isolable complexes due to the metal ion's limited capacity for π-backdonation. By employing more strongly donating π- ligands, namely neutral diborenes with a high-lying π(B=B) or- bital, monomeric 16-electron M(II)-diborene (M = Zn, Cd) π- complexes were synthesized in good yields. Metal–B2 π- interactions in both the solid and solution state were confirmed by single-crystal X-ray analyses and their solution NMR and UV-vis absorption spectroscopy, respectively. The M(II) centers adopt a trigonal planar geometry and interact almost symmetrically with both boron atoms. The MB2 planes significantly twist out of the MX\(_2\) planes about the M-centroid(B–B) vector, with angles rang- ing from 47.0° to 85.5°, depending on the steric interactions be- tween the diborene ligand and the MX\(_2\) fragment.
The diborene 1 was synthesized by reduction of a mixture of 1,2-di-9-anthryl-1,2-dibromodiborane(4) (6) and trimethylphosphine with potassium graphite. The X-ray structure of 1 shows the two anthryl rings to be parallel and their π(C\(_{14}\)) systems perpendicular to the diborene π(B=B) system. This twisted conformation allows for intercalation of the relatively high-lying π(B=B) orbital and the low-lying π* orbital of the anthryl moiety with no significant conjugation, resulting in a small HOMO-LUMO gap (HLG) and ultimately an unprecedented anthryl B–B bond hydroarylation. The HLG of 1 was estimated to be 1.57 eV from the onset of the long wavelength band in its UV–vis absorption spectrum (THF, λ\(_{onset}\) = 788 nm). The oxidation of 1 with elemental selenium afforded diboraselenirane 8 in quantitative yield. By oxidative abstraction of one phosphine ligand by another equivalent of elemental selenium, the B–B and C\(^1\)–H bonds of 8 were cleaved to give the cyclic 1,9-diboraanthracene 9.
α-Synuclein is a protein implicated in the etiopathogenesis of Parkinson’s disease (PD). AAV1/2-driven overexpression of human mutated A53T-α-synuclein in rat and monkey substantia nigra (SN) induces degeneration of nigral dopaminergic neurons and decreases striatal dopamine and tyrosine hydroxylase (TH). Given certain advantages of the mouse, especially it being amendable to genetic manipulation, translating the AAV1/2-A53T α-synuclein model to mice would be of significant value. AAV1/2-A53T α-synuclein or AAV1/2 empty vector (EV) at a concentration of 5.16 x 10\(^{12}\) gp/ml were unilaterally injected into the right SN of male adult C57BL/6 mice. Post-mortem examinations included immunohistochemistry to analyze nigral α-synuclein, Ser129 phosphorylated α-synuclein and TH expression, striatal dopamine transporter (DAT) levels by autoradiography and dopamine levels by high performance liquid chromatography. At 10 weeks, in AAV1/2-A53T α-synuclein mice there was a 33% reduction in TH+ dopaminergic nigral neurons (P < 0.001), 29% deficit in striatal DAT binding (P < 0.05), 38% and 33% reductions in dopamine (P < 0.001) and DOPAC (P < 0.01) levels and a 60% increase in dopamine turnover (homovanilic acid/dopamine ratio; P < 0.001). Immunofluorescence showed that the AAV1/2-A53T α-synuclein injected mice had widespread nigral and striatal expression of vector-delivered A53T-α-synuclein. Concurrent staining with human PD SN samples using gold standard histological methodology for Lewy pathology detection by proteinase K digestion and application of specific antibody raised against human Lewy body α-synuclein (LB509) and Ser129 phosphorylated α-synuclein (81A) revealed insoluble α-synuclein aggregates in AAV1/2-A53T α-synuclein mice resembling Lewy-like neurites and bodies. In the cylinder test, we observed significant paw use asymmetry in the AAV1/2-A53T α-synuclein group when compared to EV controls at 5 and 9 weeks post injection (P < 0.001; P < 0.05). These data show that unilateral injection of AAV1/2-A53T α-synuclein into the mouse SN leads to persistent motor deficits, neurodegeneration of the nigrostriatal dopaminergic system and development of Lewy-like pathology, thereby reflecting clinical and pathological hallmarks of human PD.