Neurologische Klinik und Poliklinik
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Sonstige beteiligte Institutionen
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- Würzburg Fabry Center for Interdisciplinary Therapy (FAZIT), University of Würzburg, Würzburg, Germany (1)
We investigated in vivo brain nicotinic acetylcholine receptor (nAChR) distribution in cognitively intact subjects with Parkinson's disease (PD) at an early stage of the disease. Fourteen patients and 13 healthy subjects were imaged with single photon emission computed tomography and the radiotracer 5-[(123)I]iodo-3-[2(S)-2-azetidinylmethoxy]pyridine ([(123)I]5IA). Patients were selected according to several criteria, including short duration of motor signs (<7 years) and normal scores at an extensive neuropsychological evaluation. In PD patients, nAChR density was significantly higher in the putamen, the insular cortex and the supplementary motor area and lower in the caudate nucleus, the orbitofrontal cortex, and the middle temporal gyrus. Disease duration positively correlated with nAChR density in the putamen ipsilateral (ρ = 0.56, p < 0.05) but not contralateral (ρ = 0.49, p = 0.07) to the clinically most affected hemibody. We observed, for the first time in vivo, higher nAChR density in brain regions of the motor and limbic basal ganglia circuits of subjects with PD. Our findings support the notion of an up-regulated cholinergic activity at the striatal and possibly cortical level in cognitively intact PD patients at an early stage of disease.
Traumatic brain injury (TBI) induces a strong inflammatory response which includes blood-brain barrier damage, edema formation and infiltration of different immune cell subsets. More recently, microvascular thrombosis has been identified as another pathophysiological feature of TBI. The contact-kinin system represents an interface between inflammatory and thrombotic circuits and is activated in different neurological diseases. C1-Inhibitor counteracts activation of the contact-kinin system at multiple levels. We investigated the therapeutic potential of C1-Inhibitor in a model of TBI. Male and female C57BL/6 mice were subjected to cortical cryolesion and treated with C1-Inhibitor after 1 h. Lesion volumes were assessed between day 1 and day 5 and blood-brain barrier damage, thrombus formation as well as the local inflammatory response were determined post TBI. Treatment of male mice with 15.0 IU C1-Inhibitor, but not 7.5 IU, 1 h after cryolesion reduced lesion volumes by ~75% on day 1. This protective effect was preserved in female mice and at later stages of trauma. Mechanistically, C1-Inhibitor stabilized the blood-brain barrier and decreased the invasion of immune cells into the brain parenchyma. Moreover, C1-Inhibitor had strong antithrombotic effects. C1-Inhibitor represents a multifaceted anti-inflammatory and antithrombotic compound that prevents traumatic neurodegeneration in clinically meaningful settings.
Traumatic brain injury (TBI) is a major cause of mortality and morbidity worldwide. Despite improvements in acute intensive care, there are currently no specific therapies to ameliorate the effects of TBI. Successful therapeutic strategies for TBI should target multiple pathophysiologic mechanisms that occur at different stages of brain injury. The kallikrein-kinin system is a promising therapeutic target for TBI as it mediates key pathologic events of traumatic brain damage, such as edema formation, inflammation, and thrombosis. Selective and specific kinin receptor antagonists and inhibitors of plasma kallikrein and coagulation factor XII have been developed, and have already shown therapeutic efficacy in animal models of stroke and TBI. However, conflicting preclinical evaluation, as well as limited and inconclusive data from clinical trials in TBI, suggests that caution should be taken before transferring observations made in animals to humans. This review summarizes current evidence on the pathologic significance of the kallikrein-kinin system during TBI in animal models and, where available, the experimental findings are compared with human data.
Background: Progressive Supranuclear Palsy (PSP) is a sporadic and progressive neurodegenerative disease which belongs to the family of tauopathies and involves both cortical and subcortical structures. No effective therapy is to date available.
Methods/design: Autologous bone marrow (BM) mesenchymal stem cells (MSC) from patients affected by different type of parkinsonisms have shown their ability to improve the dopaminergic function in preclinical and clinical models. It is also possible to isolate and expand MSC from the BM of PSP patients with the same proliferation rate and immuphenotypic profile as MSC from healthy donors. BM MSC can be efficiently delivered to the affected brain regions of PSP patients where they can exert their beneficial effects through different mechanisms including the secretion of neurotrophic factors. Here we propose a randomized, placebo-controlled, double-blind phase I clinical trial in patients affected by PSP with MSC delivered via intra-arterial injection.
Discussion: To our knowledge, this is the first clinical trial to be applied in a no-option parkinsonism that aims to test the safety and to exploit the properties of autologous mesenchymal stem cells in reducing disease progression. The study has been designed to test the safety of this " first-in-man" approach and to preliminarily explore its efficacy by excluding the placebo effect.
Trial registration: NCT01824121
FoxP3+Regulatory T Cells Determine Disease Severity in Rodent Models of Inflammatory Neuropathies
(2014)
Inflammatory neuropathies represent disabling human autoimmune disorders with considerable disease variability. Animal models provide insights into defined aspects of their disease pathogenesis. Forkhead box P3 (FoxP3)+ regulatory T lymphocytes (Treg) are anti-inflammatory cells that maintain immune tolerance and counteract tissue damage in a variety of immune-mediated disorders. Dysfunction or a reduced frequency of Tregs have been associated with different human autoimmune disorders. We here analyzed the functional relevance of Tregs in determining disease manifestation and severity in murine models of autoimmune neuropathies. We took advantage of the DEREG mouse system allowing depletion of Treg with high specificity as well as anti-CD25 directed antibodies to deplete Tregs in mice in actively induced experimental autoimmune neuritis (EAN). Furthermore antibody-depletion was performed in an adoptive transfer model of chronic neuritis. Early Treg depletion increased clinical EAN severity both in active and adoptive transfer chronic neuritis. This was accompanied by increased proliferation of myelin specific T cells and histological signs of peripheral nerve inflammation. Late stage Treg depletion after initial disease manifestation however did not exacerbate inflammatory neuropathy symptoms further. We conclude that Tregs determine disease severity in experimental autoimmune neuropathies during the initial priming phase, but have no major disease modifying function after disease manifestation. Potential future therapeutic approaches targeting Tregs should thus be performed early in inflammatory neuropathies.
Background: Persistent pain after inguinal herniorrhaphy is a disabling condition with a lack of evidence-based pharmacological treatment options. This randomized placebo-controlled trial investigated the efficacy of a capsaicin 8% cutaneous patch in the treatment of severe persistent inguinal postherniorrhaphy pain. Methods: Forty-six patients with persistent inguinal postherniorrhaphy pain were randomized to receive either a capsaicin 8% patch or a placebo patch. Pain intensity (Numerical Rating Scale [NRS 0-10]) was evaluated under standardized conditions (at rest, during movement, and during pressure) at baseline and at 1, 2 and 3 months after patch application. Skin punch biopsies for intraepidermal nerve fiber density (IENFD) measurements were taken at baseline and 1 month after patch application. Quantitative sensory testing was performed at baseline and at 1, 2, and 3 months after patch application. The primary outcome was comparisons of summed pain intensity differences (SPIDs) between capsaicin and placebo treatments at 1, 2 and 3 months after patch application (significance level P<0.01). Results: The maximum difference in SPID, between capsaicin and placebo treatments, was observed at 1 month after patch application, but the pain reduction was not significant (NRS, mean difference [95% CI]: 5.0 [0.09 to 9.9]; P=0.046). No differences in SPID between treatments were observed at 2 and 3 months after patch application. Changes in IENFD on the pain side, from baseline to 1 month after patch application, did not differ between capsaicin and placebo treatment: 1.9 [-0.1 to 3.9] and 0.6 [-1.2 to 2.5] fibers/mm, respectively (P=0.32). No significant changes in sensory function, sleep quality or psychological factors were associated with capsaicin patch treatment. Conclusions: The study did not demonstrate significant differences in pain relief between capsaicin and placebo treatment, although a trend toward pain improvement in capsaicin treated patients was observed 1 month after patch application.
Myelin formation during peripheral nervous system (PNS) development, and reformation after injury and in disease, requires multiple intrinsic and extrinsic signals. Akt/mTOR signaling has emerged as a major player involved, but the molecular mechanisms and downstream effectors are virtually unknown. Here, we have used Schwann-cell-specific conditional gene ablation of raptor and rictor, which encode essential components of the mTOR complexes 1 (mTORC1) and 2 (mTORC2), respectively, to demonstrate that mTORC1 controls PNS myelination during development. In this process, mTORC1 regulates lipid biosynthesis via sterol regulatory element-binding proteins (SREBPs). This course of action is mediated by the nuclear receptor RXRg, which transcriptionally regulates SREBP1c downstream of mTORC1. Absence of mTORC1 causes delayed myelination initiation as well as hypomyelination, together with abnormal lipid composition and decreased nerve conduction velocity. Thus, we have identified the mTORC1-RXR gamma-SREBP axis controlling lipid biosynthesis as a major contributor to proper peripheral nerve function.
Background: Patients presenting with bilateral trigeminal hypoesthesia may go on to have trigeminal isolated sensory neuropathy, a benign, purely trigeminal neuropathy, or facial-onset sensory motor neuronopathy (FOSMN), a malignant life-threatening condition. No diagnostic criteria can yet differentiate the two conditions at their onset. Nor is it clear whether the two diseases are distinct entities or share common pathophysiological mechanisms.
Methods: Seeking pathophysiological and diagnostic information to distinguish these two conditions at their onset, in this neurophysiological and morphometric study we neurophysiologically assessed function in myelinated and unmyelinated fibres and histologically examined supraorbital nerve biopsy specimens with optic and electron microscopy in 13 consecutive patients with recent onset trigeminal hypoesthesia and pain.
Results: The disease course distinctly differed in the 13 patients. During a mean 10 year follow-up whereas in eight patients the disease remained relatively stable, in the other five it progressed to possibly life-threatening motor disturbances and extra-trigeminal spread. From two to six years elapsed between the first sensory symptoms and the onset of motor disorders. In patients with trigeminal isolated sensory neuropathy (TISN) and in those with FOSMN neurophysiological and histological examination documented a neuronopathy manifesting with trigeminal nerve damage selectively affecting myelinated fibres, but sparing the Ia-fibre-mediated proprioceptive reflex.
Conclusions: Although no clinical diagnostic criteria can distinguish the two conditions at onset, neurophysiological and nerve-biopsy findings specify that in both disorders trigeminal nerve damage manifests as a dissociated neuronopathy affecting myelinated and sparing unmyelinated fibres, thus suggesting similar pathophysiological mechanisms.
Natalizumab ist ein humanisierter monoklonaler Antikörper gegen das Oberflächenadhäsionsmolekül Integrin α-4, der zur Therapie von schweren Verlaufsformen der Multiplen Sklerose (MS) zugelassen ist. Integrin α-4/β-1 wird durch Leukozyten exprimiert und steuert deren Extravasation über die Bindung an VCAM-1 (vascular cell adhesion molecule-1) auf Endothelzellen. Natalizumab wirkt über eine Blockade der Leukozytenadhäsion. In einigen Publikationen konnte darüber hinaus gezeigt werden, dass Integrin α-4 auch auf zerebralen Endothelzellen von Mäusen und Ratten exprimiert wird. In der vorliegenden Arbeit wurde die Expression und Funktion von Integrin α-4 in kultivierten primären humanen zerebralen Endothelzellen untersucht.
Die im Rahmen dieser Arbeit an verschiedenen Einzelspenderpräparationen durchgeführten FACS-Analysen zeigten, dass Integrin α-4 in unterschiedlicher Ausprägung auf primären zerebralen Endothelzellisolationen nachzuweisen war. Mit Hilfe immunzytochemischer Färbungen konnte ein spezifisches Verteilungsmuster des Integrin α-4 in Form eines feinen, granulären Musters im Bereich des Zellleibes dokumentiert werden.
In Adhäsionsversuchen zeigten Integrin α-4-exprimierende Endothelzellen nach Zugabe von Natalizumab in niedriger Konzentration eine verminderte Fähigkeit zur Haftung an Fibronectin, einem Bindungspartner in der extrazellulären Matrix. In hohen Konzentrationen dominierte im eingesetzten experimentellen System ein unspezifischer Blockadeeffekt, der auch mit Kontrollantikörpern zu beobachten war.
In MS-Läsionen findet sich auch die lösliche Form des VCAM-1 (sVCAM-1), die möglicherweise mit endothelialem Integrin α-4 interagiert. Daher wurde mit Hilfe von Western-Blot-Untersuchungen die intrazelluläre Signaltransduktion unter Stimulation mit sVCAM-1 untersucht. Es zeigte sich wie in anderen Endothelarten vorbeschrieben eine Aktivierung des p38-MAP-Kinase-Signalweges.
Zusammenfassend wurde demonstriert, dass primäre humane zerebrale Endothelzellen Integrin α-4 exprimieren und dass dieses wahrscheinlich nicht nur für die mechanische Verankerung in der Extrazellulärmatrix eine Bedeutung besitzt, sondern auch als Induktor intrazellulärer Signaltransduktion fungiert, welche die Schrankeneigenschaften zerebraler Endothelzellen beeinflussen könnte.
Background
Postherpetic neuralgia (PHN) is the painful complication of a varicella zoster virus reactivation. We investigated the systemic and local gene expression of pro- and anti-inflammatory cytokine expression in patients with PHN.
Methods
Thirteen patients with PHN at the torso (Th4-S1) were recruited. Skin punch biopsies were obtained from the painful and the contralateral painless body area for intraepidermal nerve fiber density (IENFD) and cytokine profiling. Additionally, blood was withdrawn for systemic cytokine expression and compared to blood values of healthy controls. We analyzed the gene expression of selected pro- and anti-inflammatory cytokines (tumor necrosis factor-alpha [TNF] and interleukins [IL]-1β, IL-2, and IL-8).
Results
IENFD was lower in affected skin compared to unaffected skin (p<0.05), while local gene expression of pro- and anti-inflammatory cytokines did not differ except for two patients who had 7fold higher IL-6 and 10fold higher IL-10 gene expression in the affected skin compared to the contralateral unaffected skin sample. Also, the systemic expression of cytokines in patients with PHN and in healthy controls was similar.
Conclusion
While the systemic and local expression of the investigated pro- and anti-inflammatory cytokines was not different from controls, this may have been influenced by study limitations like the low number of patients and different disease durations. Furthermore, other cytokines or pain mediators need to be considered.
A high load of white matter lesions and enlarged basilar arteries have been shown in selected patients with Fabry disease, a disorder associated with an increased stroke risk. We studied a large cohort of patients with Fabry disease to differentially investigate white matter lesion load and cerebral artery diameters. We retrospectively analyzed cranial magnetic resonance imaging scans of 87 consecutive Fabry patients, 20 patients with ischemic stroke, and 36 controls. We determined the white matter lesion load applying the Fazekas score on fluid-attenuated inversion recovery sequences and measured the diameters of cerebral arteries on 3D-reconstructions of the time-of-flight-MR-angiography scans. Data of different Fabry patient subgroups (males – females; normal – impaired renal function) were compared with data of patients with stroke and controls. A history of stroke or transient ischemic attacks was present in 4/30 males (13%) and 5/57 (9%) females with Fabry disease, all in the anterior circulation. Only one man with Fabry disease showed confluent cerebral white matter lesions in the Fazekas score assessment (1%). Male Fabry patients had a larger basilar artery (p<0.01) and posterior cerebral artery diameter (p<0.05) compared to male controls. This was independent of disease severity as measured by renal function and did not lead to changes in arterial blood flow properties. A basilar artery diameter of >3.2 mm distinguished between men with Fabry disease and controls (sensitivity: 87%, specificity: 86%, p<0.001), but not from stroke patients. Enlarged arterial diameters of the posterior circulation are present only in men with Fabry disease independent of disease severity.
Skin cytokine expression in patients with fibromyalgia syndrome is not different from controls
(2014)
Background
Fibromyalgia syndrome (FMS) is a chronic pain syndrome of unknown etiology. There is increasing evidence for small nerve fiber impairment in a subgroup of patients with FMS. We investigated whether skin cytokine and delta opioid receptor (DOR) gene expression in FMS patients differs from controls as one potential contributor to small nerve fiber sensitization.
Methods
We investigated skin punch biopsies of 25 FMS patients, ten patients with monopolar depression but no pain, and 35 healthy controls. Biopsies were obtained from the lateral upper thigh and lower calf. Gene expression of the pro-inflammatory cytokines tumor necrosis factor-alpha (TNF), interleukin (IL)-6, and IL-8 and of the anti-inflammatory cytokine IL-10 was analyzed using quantitative real-time PCR and normalizing data to 18sRNA as housekeeping gene. Additionally, we assessed DOR gene expression.
Results
All cytokines and DOR were detectable in skin samples of FMS patients, patients with depression, and healthy controls without intergroup difference. Also, gene expression was not different in skin of the upper and lower leg within and between the groups and in FMS patient subgroups.
Conclusions
Skin cytokine and DOR gene expression does not differ between patients with FMS and controls. Our results do not support a role of the investigated cytokines in sensitization of peripheral nerve fibers as a potential mechanism of small fiber pathology in FMS.
Introduction
The neuronal ceroid lipofuscinoses constitute a group of fatal inherited lysosomal storage diseases that manifest in profound neurodegeneration in the CNS. Visual impairment usually is an early symptom and selective degeneration of retinal neurons has been described in patients suffering from distinct disease subtypes. We have previously demonstrated that palmitoyl protein thioesterase 1 deficient (Ppt1-/-) mice, a model of the infantile disease subtype, exhibit progressive axonal degeneration in the optic nerve and loss of retinal ganglion cells, faithfully reflecting disease severity in the CNS. Here we performed spectral domain optical coherence tomography (OCT) in Ppt1-/- and ceroid lipofuscinosis neuronal 3 deficient (Cln3-/-) mice, which are models of infantile and juvenile neuronal ceroid lipofuscinosis, respectively, in order to establish a non-invasive method to assess retinal alterations and monitor disease severity in vivo.
Results
Blue laser autofluorescence imaging revealed increased accumulation of autofluorescent storage material in the inner retinae of 7-month-old Ppt1-/- and of 16-month-old Cln3-/- mice in comparison with age-matched control littermates. Additionally, optical coherence tomography demonstrated reduced thickness of retinae in knockout mice in comparison with age-matched control littermates. High resolution scans and manual measurements allowed for separation of different retinal composite layers and revealed a thinning of layers in the inner retinae of both mouse models at distinct ages. OCT measurements correlated well with subsequent histological analysis of the same retinae.
Conclusions
These results demonstrate the feasibility of OCT to assess neurodegenerative disease severity in mouse models of neuronal ceroid lipofuscinosis and might have important implications for diagnostic evaluation of disease progression and therapeutic efficacy in patients. Moreover, the non-invasive method allows for longitudinal studies in experimental models, reducing the number of animals used for research.
Background
The role of the immune system in the pathophysiology of acute ischemic stroke is increasingly recognized. However, targeted treatment strategies to modulate immunological pathways in stroke are still lacking. Glatiramer acetate is a multifaceted immunomodulator approved for the treatment of relapsing-remitting multiple sclerosis. Experimental studies suggest that glatiramer acetate might also work in other neuroinflammatory or neurodegenerative diseases apart from multiple sclerosis.
Findings
We evaluated the efficacy of glatiramer acetate in a mouse model of brain ischemia/reperfusion injury. 60 min of transient middle cerebral artery occlusion was induced in male C57Bl/6 mice. Pretreatment with glatiramer acetate (3.5 mg/kg bodyweight) 30 min before the induction of stroke did not reduce lesion volumes or improve functional outcome on day 1.
Conclusions
Glatiramer acetate failed to protect from acute ischemic stroke in our hands. Further studies are needed to assess the true therapeutic potential of glatiramer acetate and related immunomodulators in brain ischemia.
Zytotoxische CD8+ T-Lymphozyten spielen in vielen inflammatorischen, aber auch primär neurodegenerativen Erkrankungen eine wichtige Rolle. Daher besitzt die Fragestellung inwiefern CD8+ ZTL Neurone direkt schädigen und ggf. welche mechanistischen Aspekte dieser Schädigung zugrunde liegen, eine hohe Relevanz. Um diese Fragestellung eingehender zu beleuchten, wurde mit dem OT-I-System gearbeitet. Dieses gut vorcharakterisierte CD8+ T-Zell-Modell besitzt den Vorteil, dass diese transgenen Zellen nur eine Peptidsequenz des Ovalbumin (OVA) Protein als spezifisches Antigen erkennen.
Zunächst wurden in der vorliegenden Arbeit Co-Kultivierungs-Experimente durchgeführt. Hierzu wurden akut isolierte murine Hippokampus-Neurone unter verschiedenen Bedingungen mit OT-I Lymphozyten co-kultiviert. Hierbei konnte gezeigt werden, dass unter Antigenpräsentation der Neurone signifikant mehr Neurone in die Apoptose/Nekrose geführt werden, als unter Kontroll-Bedingungen, in denen entweder kein Antigen oder ein Antigen, das nicht von OT-I Lymphozyten erkannt wird, präsentiert wird.
Nachdem die Antigen-abhängigen zytotoxischen Effekte auf Neurone gezeigt werden konnten, wurde mithilfe elektrophysiologischer Techniken die mechanistischen und funktionellen Konsequenzen des direkten neuronalen/OT-I-vermittelten Zellkontakts untersucht. Bei diesem experimentellen Ansatz wurde durch elektrisches Auslenken eines Neurons nach Kontakt mit einem OT-I Lymphozyt die passiven elektrischen Parameter der Neuronenmembran gemessen. In diesen Messungen konnte gezeigt werden, dass nach unmittelbarem Kontakt eines Neurons mit einem OT-I Lymphozyt der neuronale Membranwiderstand reduziert wird bzw. die Leitfähigkeit der Zellmembran erhöht wird. Diese Änderung der neuronalen Membran-Leitfähigkeit findet in einem Zeitraum von 10 min nach dem Zell-Zell-Kontakt statt. Auch hier konnte gezeigt werden, dass dieser Einfluss von OT-I Lymphozyten auf Neurone strikt Antigen-abhängig ist. Zur Untersuchung des Mechanismus der OT-I T-Lymphozyten auf Neurone wurde das Augenmerk auf verschiedene T-Zell-induzierte Apoptosewegegelegt. Es konnte gezeigt werden, dass durch Blockieren der Fas/FasL-Interaktion mittels eines Antikörpers kein Unterschied, weder in der neuronalen Apoptoserate nach Co-Kultivierung, noch eine Änderung der passiven neuronalen Membran-Leitfähigkeit auftritt. Weiterhin wurde die Rolle der von T-Zellen sezernierten Granula Perforin und Granzym B untersucht. Um den Einfluss dieser Granula aufzuklären, wurden OT-I Lymphozyten verwendet, die entweder defizient für Perforin oder Granzym B waren. In diesem experimentellen Ansatz wurde gezeigt, dass ausschließlich Perforin für die Erniedrigung des passiven neuronalen Membran-Widerstandes verantwortlich ist.
Diese Erhöhung der neuronalen Membranleitfähigkeit führte aber nicht direkt zum neuronalen Zelltod. Vielmehr wurde durch die einhergehende Depolarisation des Neurons die elektrische Aktivität der Zelle vermindert, sodass es zu einem sogenannten „electrical silencing“ kommt. Dieser Umstand konnte auch in der Betrachtung der spontanen Netzwerkaktivität von Neuronenkulturen gezeigt werden. Hierfür wurden hoch dichte Neuronenkulturen auf MEA-Chips kultiviert. Mit Hilfe dieser MEA konnten die Summenfeldpotentiale der Neuronenkulturen detektiert werden. Hierbei wurde beobachtet, dass nach Beladung der Neuronen mit dem spezifischen OT-I-Antigen und OT-I Zellen eine Verringerung der spontanen Netzwerkaktivität einhergeht. Auch in diesem Effekt konnte eine Antigen-Spezifität nachgewiesen werden.
Da der Prozess der zellulären Apoptose mit einem Anstieg der intrazellulären Ca2+-Konzentration einhergeht, und Perforin als Ca2+-durchlässiger unselektiver Porenbildner fungiert, wurden zur Überprüfung der Hypothese calcium imaging-Experimente durchgeführt. Analog zu den elektrophysiologischen Messungen wurde gezeigt, dass nach direktem Zell-Zell-Kontakt zwischen Neuron und OT-I Lymphozyt eine Erhöhung der intrazellulären Ca2+-Konzentration zu messen ist. Dass diese Änderung des neuronalen Ca2+-Einstroms durch Perforin-abhängige Membranporen hervorgerufen wird, konnte durch die Verwendung von Perforin-defizienten OT-I Lymphozyten bewiesen werden. Unter Verwendung von Perforin-defizienten OT-I Lymphozyten wurde keine Änderung der neuronalen Ca2+-Konzentration ermittelt. Weiterhin wurde in diesem experimentellen Ansatz gezeigt, dass auch der OT-I-vermittelte neuronale Ca2+-Anstieg strikt Antigen-abhängig ist.Zusammengefasst konnte in dieser Arbeit gezeigt werden, dass MHC-I/Antigen-vermittelte CD8+ Lymphozyten-Interaktion mit einem Neuron zu „electrical silencing“ des Neurons führt. Dieser Prozess ist klar Perforin-abhängig, führt jedoch nicht zum unmittelbaren Zelltod des Neurons.
Über die Nervensonographie wurde bereits in den 1980er Jahren erstmals berichtet. Die rasche Weiterentwicklung der Technik hat dazu geführt, dass es inzwischen zahlreiche Fallberichte und einige Studien gibt, die sich mit der Darstellung peripherer Nerven durch Ultraschall als Mittel zur Diagnose verschiedener Nervpathologien beschäftigen. Besonders bei der Diagnostik des epidemiologisch häufigen Karpaltunnelsyndroms ist die sonographische Beurteilung des N. medianus in dieser Lokalisation vielerorts bereits etablierter Bestandteil der Diagnostik.
In der hier vorgelegten Studie sollte der Stellenwert der B-Bild-Sonographie peripherer Nerven am Unterschenkel für die Diagnose einer Vaskulitischen Neuropathie geprüft werden. Dazu musste zunächst die Ultraschalluntersuchung spezieller Nerven am Unterschenkel etabliert werden. Diese ist technisch deutlich anspruchsvoller als die Darstellung von Karpaltunnelsyndrom oder Armplexus.
Durch die fünfmalige Untersuchung zehn junger Personen wurden ultraschalltechnisch leicht reproduzierbar anatomisch auffindbare und Anisotropie-vermeidende Abschnitte von N. suralis, N. peroneus communis, profundus, superfcialis und N. tibialis definiert und als Messpunkte der Studie zu Grunde gelegt.
In die von der Ethikkommission der Medizinischen Fakultät positiv beschiedene Studie wurden 26 Patienten/-innen, die klinisch und elektrophysiologisch nachgewiesen eine Polyneuropathie hatten und bei denen zur Ursachendiagnostik eine Biopsie und histologische Aufarbeitung des N. suralis durchgeführt wurde (Abteilung für Neuropathologie des Pathologischen Instituts der Universität sowie Histologielabor der Neurologischen Universitätsklinik), sowie 26 Kontrollpersonen ohne klinischen Hinweis auf eine Polyneuropathie nach informiertem Einverständnis aufgenommen. Für jede/-n Patienten/-in wurde ein/-e Proband/-in gleichen Geschlechts mit einem Altersunterschied von höchstens fünf Jahren in die Kontrollgruppe aufgenommen. Alle 52 Untersuchten mussten erwachsen und 160 – 180 cm groß sein.
Bei allen Patienten/-innen und Kontrollpersonen wurden jeweils der GD, der KD, der LD und die QSF des N. suralis am unteren Drittel der Wade und distal im Bereich des Außenknöchels, des N. tibialis nahe des Innenknöchels, des N. peroneus communis im Bereich des Fibulaköpfchens, des N. peroneus profundus am Fußrücken und nahe der Großzehen und des N. peroneus superficialis im Bereich des distalen Schienbeins bestimmt.
Alle gesuchten Nerven waren bei allen Versuchspersonen eindeutig identifizierbar. Die Untersuchungen wurden durch eine Untersucherin mit demselben Gerät, geblindet für das Ergebnis der Histologie, durchgeführt. Das gewährleistete eine Konstanz in der schwierigen und mit Unsicherheiten behafteten Messung der Nervenstrukturen, was ausführlich diskutiert wird.
Ein statistisch signifikanter Unterschied zwischen den sonographisch erhobenen Messdaten der PNP-Gruppe und der Kontrollgruppe konnte bei 20 der 28 Parameter gezeigt werden. Bei 11 der 28 Parameter konnte zwischen Vaskulitis-Patienten/-innen und allen anderen, also PNP-Patienten/-innen und der Kontrollgruppe, ein statistisch signifikanter Unterschied festgestellt werden. Außerdem ergab die statistische Analyse bei drei der 28 Messgrößen einen statistisch signifikanten Unterschied zwischen Patienten/-innen mit und ohne Demyelinisierung des N. suralis in der feingeweblichen Untersuchung.
Die sonographischen Ergebnisse der Vakulitis-Patienten/-innen unterschieden sich nicht von denen der PNP-Patienten/-innen mit anderer Ätiologie. Es wurde auch kein statistisch signifikanter Unterschied zwischen den Werten der PNP-Patienten/-innen mit und ohne histologisch gesicherte entzündliche Komponente beobachtet.
Gemäß der histologischen Untersuchung der Biopsate wurde bei sechs Patienten/-innen eine Vaskulitis diagnostiziert. Bei fünf dieser Patienten/-innen fielen teilweise Kalibersprünge im Sinne einer Zunahme der QSF oder Abflachung im Verlauf des N. suralis, N. peroneus superficialis und N. peroneus communis auf. Aber auch bei Patienten/-innen mit einer anderen Form der Polyneuropathie und einigen Kontrollpersonen waren Besonderheiten im sonographischen Bild einzelner Nerven zu beobachten.
Mit der vorgelegten Untersuchung konnte zwar nicht gezeigt werden, dass die Nervensonographie einen Beitrag zur differentialdiagnostischen Abgrenzung Vaskulitischer Polyneuropathien leisten kann, der den Goldstandard invasiver Nervenbiopse entbehrlich machen könnte. Das war bei der histologischen Unterschiedlichkeit der beschädigten Nervenanatomie bei Vaskulitis aber auch nicht ernsthaft zu erwarten.
Die vorgelegte Arbeit zeigt aber auch, dass kranke periphere Nerven von gesunden Nerven im Ultraschall unterscheidbar sind, wenn man wie hier systematisch mit 28 Parametern an sieben Messpunkten untersucht. Dies allerdings dauert auch für einen Geübten 40 bis 60 Minuten, so dass die Polyneuropathiediagnostik oder gar Differentialdiagnostik mittels Ultraschall aktuell noch als Forschungsinstrument an großen Fallzahlen anzusehen ist.
Dabei wird es künftig für die Gruppenbildung der sonographisch Untersuchten neben ätiologischer und histologischer Gruppenbildung darauf ankommen, das Krankheitsbild besser zu definieren, d.h. Ausmaß von Demyelinisierung, Remyelinisierung und axonalem Untergang in geeignete Skalen zu fassen.
Auch die Magnetresonanztomographie stellt eine Option als diagnostischer Baustein bei Vaskulitischer Polyneuropathie dar. Dieses bildgebende Verfahren kann bereits zur Diagnostik von traumatischen Nervverletzungen, Kompressionensyndromen, Raumforderungen im Bereich der Nerven und Plexusneuritis eingesetzt werden.
Wir untersuchten die zerebrale Aktivierung von Patienten mit Fibromyalgie-Syndrom (FMS) mittels funktioneller Nah-Infrarot-Spektroskopie (fNIRS). Das FMS ist ein Symptomenkomplex aus Schmerzen in mehreren Körperregionen sowie weiteren körperlichen und seelischen Beschwerden, wie Schlafstörungen, kognitiven Defiziten und Depressionen. Die fNIRS ist eine neue, nicht-invasive Technik, die eine indirekte Messung der regionalen kortikalen Hirnaktivierung erlaubt.
Es wurden 25 FMS-Patienten, 10 MD-Patienten ohne Schmerzen und 35 gesunde Kontrollen in die Studie eingeschlossen. Alle Patienten wurden klinisch-neurologisch untersucht. Darüber hinaus füllten alle Teilnehmer Fragebögen zu Schmerzen (GCPS, NPSI), FMS-Symptomen (FIQ), Depressionen (BDI II, ADS) und Empathiefähigkeit (SPF) aus. Die kortikale Aktivierung wurde unter drei Stimulations-Bedingungen mittels fNIRS gemessen: 1.) Anwendung mechanischer (Druck-) Schmerzreize auf den dorsalen Unterarm; 2.) Anwendung visuell-emotionaler Reize in Form von neutralen, negativen und Schmerz-assoziierten Bildern; 3.) Wortflüssigkeitstest. Ergänzend wurden die unter 2.) präsentierten Bilder bewertet sowie ein Zahlenverbindungstest durchgeführt.
FMS-Patienten hatten in den Schmerzfragebögen und im FIQ-Fragebogen deutlich höhere Werte als MD-Patienten und Kontrollen (p < 0,001). In den Depressionsfragebögen erreichten FMS-Patienten ähnlich hohe Werte wie MD-Patienten. Die Empathiefähigkeit war bei FMS-Patienten tendenziell stärker ausgeprägt als bei MD-Patienten und Kontrollen. FMS-Patienten zeigten niedrigere Druckschmerzschwellen bei gleicher Schmerzintensität als MD-Patienten und Kontrollen (p < 0,001). Auf einen unilateralen schmerzhaften Druckreiz reagierten FMS-Patienten mit einer verstärkten bilateralen kortikalen Aktivierung, die sich im Vergleich zu Kontrollen insbesondere im rechten präfrontalen Kortex (p < 0,05) sowie zu MD-Patienten bilateral im Frontalkortex unterschied (p < 0,05). Auf einen Druckreiz der gleichen Stärke, der für FMS-Patienten schmerzhaft, aber für Zusatzkontrollen schmerzfrei war, zeigten FMS-Patienten im Vergleich zu diesen eine verstärkte Aktivierung im linken dorsolateralen präfrontalen Kortex (p < 0,05). Der kortikale Aktivierungsunterschied bei Schmerz-assoziierten versus neutralen Bildern war bei FMS-Patienten im linken präfrontalen Kortex wesentlich ausgeprägter als bei Kontrollen (p < 0,05), während die Schmerz-assoziierten Bilder von FMS-Patienten weniger unangenehm bewertet wurden als von Kontrollen. Der Aktivierungsunterschied bei negativen versus neutralen Bildern war bei MD-Patienten im linken Frontalkortex wesentlich geringer ausgeprägt als bei FMS-Patienten und Kontrollen (p < 0,05). Im Wortflüssigkeitstest und im Zahlenverbindungstest konnten keine kognitiven Defizite bzw. Aktivierungsunterschiede zwischen FMS-Patienten und Kontrollen gefunden werden. Allerdings zeigten MD-Patienten in beiden Bedingungen des Wortflüssigkeitstests eine geringere frontale Aktivierung als FMS-Patienten und Kontrollen (p < 0,05).
Diese Studie belegt die veränderte zentrale Schmerzverarbeitung bei FMS-Patienten und zeigt, dass diese mittels fNIRS messbar ist. FMS-Patienten zeigten stärkere Aktivierungen Schmerz-assoziierter Hirnareale während mechanischer und visueller Schmerzstimuli im Vergleich zu gesunden Kontrollen. Zudem bestätigt diese Studie die Unterscheidung zwischen FMS und Depression.
Der Einfluss von Autoantikörpern gegen Aquaporin 4 bei der Pathogenese der Neuromyelitis optica
(2014)
Neuromyelitis optica (NMO) ist eine schwerwiegende Autoimmunerkrankung des zentralen Nervensystems, deren pathogene Ursache in Zusammenhang mit Autoantikörpern gegen Aquaporin 4 (AQP4) steht. In einem intrathekalen Passiv-Transfermodell der Ratte wurden die Auswirkungen von NMO-Immunglobulin (IgG) aus Plasmapheresematerial und rekombinanten Antikörpern gegen AQP4 sowie der Effekt von additiver Applikation von humanem Komplement untersucht. NMO-IgG, rekombinante Antikörper und modifizierte Antikörper ohne Fähigkeit zur Aktivierung der Komplementkaskade waren bei repetitiver Applikation in der Lage, auch ohne additives humanes Komplement NMO-ähnliche progrediente motorische Symptome zu induzieren. Durch Ko-Injektion von humanem Komplement konnte keine signifikante Exazerbation der Pathologie bewirkt werden.
MRT-Studien zeigten lokale Schrankenstörungen am Ort der höchsten Antikörperkonzentration. In histologischen Aufarbeitungen von Rückenmarksschnitten zeigten sich lokale Deposition an humanem IgG, ein dazu korrelierender Verlust an AQP4 sowie eine darüber hinausgehende Reduktion des Glutamattransporters EAAT2, während GFAP-reaktive Astrozyten tendenziell hypertroph und vermehrt waren. Auch bei additiver Applikation von humanem Komplement wiesen die Läsionsareale im Gegensatz zu histopathologischen Befunden bei NMO-Patienten und anderen Tiermodellen nur eine geringe Ablagerung von aktivem Komplement und wenig Infiltration durch ED1-positive Makrophagen auf. Da in einem Kontrollexperiment mit intrazerebraler intraparenchymaler Applikation von NMO-IgG die beschriebene additive Zytotoxizität von humanem Komplement reproduziert werden konnte, erscheint die Verwendbarkeit des intrathkalen Modells zur Evaluation der Wirkung von humanem Komplement bei Autoimmunerkrankungen mit intraspinalen Zielepitopen nicht geeignet.
Die Ergebnisse lassen sich als Komplement-unabhängige intrinsische Wirkungen von Antikörpern gegen AQP4 deuten, die in einer Reduktion der Oberflächenexpresseion von AQP4 und EAAT2 resultieren und zu einer progredienten Myelopathie führen. Neben der bekannten Antikörper-induzierten Komplement-abhängigen Zytotoxizität könnten diese Effekte einen bislang nicht beschriebenen zusätzlichen Pathomechanismus bei der NMO darstellen.
Dementia, or any form of degenerative cognitive decline, is one of the major problems in present, and even more will be in future medicine. With Alzheimer's disease (AD) being the most prevalent, Vascular Dementia is the second most entity of dementing processes in the elderly. As diagnostic criteria are still imprecise and in many cases do not embrace early stages of the disease, recent studies have proposed more detailed classifications of the newly created condition Vascular Cognitive Impairment (VCI). Of all conditions subsumed under this term, subcortical small-vessel alterations are the most common cause for cognitive decline. The diagnosis of dementia / cognitive impairment is presently often made in late stages of the disease, when therapeutical options are poor. Thus, early detection of changes of the subcortical small vessels is desirable, when there is still time to identify and aggressively treat risk factors and underlying conditions like diabetes, hyper- or hypotension, and hyperlipidemia. This study aimed to evaluate whether cTT correlates to cognitive dysfunction, i.e. if cTT is fit as an early diagnostic tool for VCI. The study cohort included 38 patients from the Neurological Clinic of the Würzburg University hospital admitted due to diagnoses other than dementia or stroke. As a result of this study it turned out that cTT is certainly capable of fulfilling the task to easily and effectively detect and evaluate possible microvascular lesions of the brain with respect to the actual clinical relevance for the patient. When compared to the other proposed diagnostic tools, neuropsychological testing and MRI, the advantages of cTT are obvious: its measurement is a low-cost and quick procedure which would spare both patients and examiners a long neuropsychological exam or complement it. cTT is safe to assess as the only possible risks derive from the use of the contrast agent, which are rare and easily manageable. It has also proven to be more accurate in showing the extent of cognitive impairment than MRI. Finally, it is widely available. The only prerequisite is an ultrasound machine capable of transcranial color-coded duplex sonography. No cost-intensive procedures like MRI are needed. So, with neuropsychological testing remaining the gold standard, cTT here proved to be a reliable alternative which is more time- and cost-effective than MRI.
Background
Human cerebral small vessel disease (CSVD) has distinct histopathologic and imaging findings in its advanced stages. In spontaneously hypertensive stroke-prone rats (SHRSP), a well-established animal model of CSVD, we recently demonstrated that cerebral microangiopathy is initiated by early microvascular dysfunction leading to the breakdown of the blood–brain barrier and an activated coagulatory state resulting in capillary and arteriolar erythrocyte accumulations (stases). In the present study, we investigated whether initial microvascular dysfunction and other stages of the pathologic CSVD cascade can be detected by serial magnetic resonance imaging (MRI).
Findings
Fourteen SHRSP and three control (Wistar) rats (aged 26–44 weeks) were investigated biweekly by 3.0 Tesla (3 T) MRI. After perfusion, brains were stained with hematoxylin–eosin and histology was correlated with MRI data. Three SHRSP developed terminal CSVD stages including cortical, hippocampal, and striatal infarcts and macrohemorrhages, which could be detected consistently by MRI. Corresponding histology showed small vessel thromboses and increased numbers of small perivascular bleeds in the infarcted areas. However, 3 T MRI failed to visualize intravascular erythrocyte accumulations, even in those brain regions with the highest densities of affected vessels and the largest vessels affected by stases, as well as failing to detect small perivascular bleeds.
Conclusion
Serial MRI at a field strength of 3 T failed to detect the initial microvascular dysfunction and subsequent small perivascular bleeds in SHRSP; only terminal stages of cerebral microangiopathy were reliably detected. Further investigations at higher magnetic field strengths (7 T) using blood- and flow-sensitive sequences are currently underway.