Klinik und Poliklinik für Allgemein-, Viszeral-, Gefäß- und Kinderchirurgie (Chirurgische Klinik I)
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Institute
- Klinik und Poliklinik für Allgemein-, Viszeral-, Gefäß- und Kinderchirurgie (Chirurgische Klinik I) (503)
- Theodor-Boveri-Institut für Biowissenschaften (34)
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- Medizinische Klinik und Poliklinik I (19)
- Institut für diagnostische und interventionelle Radiologie (Institut für Röntgendiagnostik) (16)
- Klinik und Poliklinik für Anästhesiologie (ab 2004) (15)
- Kinderklinik und Poliklinik (14)
- Pathologisches Institut (13)
- Institut für Anatomie und Zellbiologie (8)
Sonstige beteiligte Institutionen
- Krankenhaushygiene und Antimicrobial Stewardship (2)
- Abteilung für Molekulare Onkoimmunologie (1)
- Harvard Medical School, Boston, USA (1)
- Institut für Medizinische Lehre und Ausbildungsforschung, Universität Würzburg (1)
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- Klinikum Main-Spessart Lohr (1)
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- Krankenhaushygiene und Antimicrobial Stewardship, Universitätsklinikum Würzburg (1)
- Lehrkrankenhaus der Universität Würzburg: Klinikum Main-Spessart (1)
- Lehrstuhl für Tissue Engineering und Regenerative Medizin der Universität Würzburg (1)
Protein Kinase D2 drives chylomicron‐mediated lipid transport in the intestine and promotes obesity
(2021)
Lipids are the most energy‐dense components of the diet, and their overconsumption promotes obesity and diabetes. Dietary fat content has been linked to the lipid processing activity by the intestine and its overall capacity to absorb triglycerides (TG). However, the signaling cascades driving intestinal lipid absorption in response to elevated dietary fat are largely unknown. Here, we describe an unexpected role of the protein kinase D2 (PKD2) in lipid homeostasis. We demonstrate that PKD2 activity promotes chylomicron‐mediated TG transfer in enterocytes. PKD2 increases chylomicron size to enhance the TG secretion on the basolateral side of the mouse and human enterocytes, which is associated with decreased abundance of APOA4. PKD2 activation in intestine also correlates positively with circulating TG in obese human patients. Importantly, deletion, inactivation, or inhibition of PKD2 ameliorates high‐fat diet‐induced obesity and diabetes and improves gut microbiota profile in mice. Taken together, our findings suggest that PKD2 represents a key signaling node promoting dietary fat absorption and may serve as an attractive target for the treatment of obesity.
Der Thoraxmagen beschreibt eine zirkuläre Schwachstelle der phrenikoösophagealen Membran mit einer schrittweisen Dislozierung der Magenkardia und des Ösophagus nach mediastinal. Die Therapie des Thoraxmagens kann konservativ im Sinne des „watchful waiting“ oder operativ erfolgen. Aufgrund der möglichen Komplikationen wird die elektive Operation durch die amerikanischen Leitlinien empfohlen. Ein zentrales Problem der Hiatushernienchirurgie stellt die hohe Anzahl an Rezidiven dar. Ob die Gründe hierfür in der Zwerchfellrekonstruktion, Speiseröhrenlänge, Fundoplicatio oder Netzaugmentation liegen, wird nach wie vor kontrovers diskutiert.
In dieser Arbeit wurde die operative Versorgung des Thoraxmagens von 124 Patienten des Universitätsklinikums Würzburg im Zeitraum von September 2008 bis Juni 2015 untersucht. Hierfür war neben den perioperativen Daten auch die Rezidiv- und Letalitätsrate von Relevanz. Das Patientenkollektiv wurde sowohl in Hinblick auf das Lebensalter als auch auf die verschiedenen Versorgungsarten analysiert. Um die postoperative Lebensqualität zu beurteilen, erfolgte die Patientenbefragung mit Hilfe eines Symptomfragebogens und dem Gastrointestinalen Lebensqualitätsindex nach Eypasch (GIQLI). Zusätzlich wurden 17 Patienten postoperativ mittels MRT untersucht, um eine optimierte MRT-Sequenz zur Beurteilung der Hiatusregion zu evaluieren.
Im Vergleich der Altersgruppen zeigte sich trotz einer erhöhten Komorbiditätsrate bei dem Patientenkollektiv ≥ 75 Jahre (p=0,002) kein signifikanter Unterschied bei Betrachtung der intraoperativen Komplikationen. Die Rezidivrate lag unabhängig vom Alter bei 20,2% im Untersuchungszeitraum, jedoch konnte eine verminderte Rezidivrate bei Patienten mit U-Shape Versorgung (p=0,015) festgestellt werden.
In der postoperativen Patientenbefragung zeigten sich 87,0% der Patienten, unabhängig vom Alter und der Versorgungsart, zufrieden mit dem Operationsergebnis und beschrieben ihren Zustand im Vergleich zu präoperativ als gebessert. Die Ergebnisse des GIQLI erbrachten in dem untersuchten Patientenkollektiv ein gegenüber der Allgemeinbevölkerung erniedrigten Wert mit 95,4 Punkten.
Die optimierte MRT-Sequenz zeichnete sich durch eine hohe diagnostische Konfidenz bei guter Bildqualität, kurzer Untersuchungsdauer und gleichzeitig hoher Akzeptanz der Patienten gegenüber dieser Art der Diagnostik aus.
Zusammenfassend stellt die operative Versorgung von Thoraxmägen, unabhängig des Patientenalters, eine sichere Therapieform dar, die zu einer hohen Patientenzufriedenheit führt. Die modifizierte MRT-Untersuchung hat sich als diagnostische Methode bewährt und stellt eine Alternative zu strahlenexponierenden oder von Seiten der Patienten weniger gut tolerierten Untersuchungsmodalitäten dar.
Background
The impact of hospital volume after rectal cancer surgery is seldom investigated. This study aimed to analyse the impact of annual rectal cancer surgery cases per hospital on postoperative mortality and failure to rescue.
Methods
All patients diagnosed with rectal cancer and who had a rectal resection procedure code from 2012 to 2015 were identified from nationwide administrative hospital data. Hospitals were grouped into five quintiles according to caseload. The absolute number of patients, postoperative deaths and failure to rescue (defined as in‐hospital mortality after a documented postoperative complication) for severe postoperative complications were determined.
Results
Some 64 349 patients were identified. The overall in‐house mortality rate was 3·9 per cent. The crude in‐hospital mortality rate ranged from 5·3 per cent in very low‐volume hospitals to 2·6 per cent in very high‐volume centres, with a distinct trend between volume categories (P < 0·001). In multivariable logistic regression analysis using hospital volume as random effect, very high‐volume hospitals (53 interventions/year) had a risk‐adjusted odds ratio of 0·58 (95 per cent c.i. 0·47 to 0·73), compared with the baseline in‐house mortality rate in very low‐volume hospitals (6 interventions per year) (P < 0·001). The overall postoperative complication rate was comparable between different volume quintiles, but failure to rescue decreased significantly with increasing caseload (15·6 per cent after pulmonary embolism in the highest volume quintile versus 38 per cent in the lowest quintile; P = 0·010).
Conclusion
Patients who had rectal cancer surgery in high‐volume hospitals showed better outcomes and reduced failure to rescue rates for severe complications than those treated in low‐volume hospitals.
Simple Summary
Despite significant strides in multimodal therapy, cancers still rank within the first three causes of death especially in industrial nations. A lack of individualized approaches and accurate preclinical models are amongst the major barriers that limit the development of novel therapeutic options and drugs. Recently, the 3D culture system of organoids was developed which stably retains the genetic and phenotypic characteristics of the original tissue, healthy as well as diseased. In this review, we summarize current data and evidence on the relevance and reliability of such organoid culture systems in cancer research, focusing on their role in drug investigations (in a personalized manner).
Abstract
Organoids are a new 3D ex vivo culture system that have been applied in various fields of biomedical research. First isolated from the murine small intestine, they have since been established from a wide range of organs and tissues, both in healthy and diseased states. Organoids genetically, functionally and phenotypically retain the characteristics of their tissue of origin even after multiple passages, making them a valuable tool in studying various physiologic and pathophysiologic processes. The finding that organoids can also be established from tumor tissue or can be engineered to recapitulate tumor tissue has dramatically increased their use in cancer research. In this review, we discuss the potential of organoids to close the gap between preclinical in vitro and in vivo models as well as clinical trials in cancer research focusing on drug investigation and development.
Understanding the mechanisms of early invasion and epithelial defense in opportunistic mold infections is crucial for the evaluation of diagnostic biomarkers and novel treatment strategies. Recent studies revealed unique characteristics of the immunopathology of mucormycoses. We therefore adapted an alveolar Transwell® A549/HPAEC bilayer model for the assessment of epithelial barrier integrity and cytokine response to Rhizopus arrhizus, Rhizomucor pusillus, and Cunninghamella bertholletiae. Hyphal penetration of the alveolar barrier was validated by 18S ribosomal DNA detection in the endothelial compartment. Addition of dendritic cells (moDCs) to the alveolar compartment led to reduced fungal invasion and strongly enhanced pro-inflammatory cytokine response, whereas epithelial CCL2 and CCL5 release was reduced. Despite their phenotypic heterogeneity, the studied Mucorales species elicited the release of similar cytokine patterns by epithelial and dendritic cells. There were significantly elevated lactate dehydrogenase concentrations in the alveolar compartment and epithelial barrier permeability for dextran blue of different molecular weights in Mucorales-infected samples compared to Aspergillus fumigatus infection. Addition of monocyte-derived dendritic cells further aggravated LDH release and epithelial barrier permeability, highlighting the influence of the inflammatory response in mucormycosis-associated tissue damage. An important focus of this study was the evaluation of the reproducibility of readout parameters in independent experimental runs. Our results revealed consistently low coefficients of variation for cytokine concentrations and transcriptional levels of cytokine genes and cell integrity markers. As additional means of model validation, we confirmed that our bilayer model captures key principles of Mucorales biology such as accelerated growth in a hyperglycemic or ketoacidotic environment or reduced epithelial barrier invasion upon epithelial growth factor receptor blockade by gefitinib. Our findings indicate that the Transwell® bilayer model provides a reliable and reproducible tool for assessing host response in mucormycosis.
Despite the increasing incidence and prevalence of Crohn’s Disease (CD), no curative options exist and treatment remains complex. While therapy has mainly focused on medical approaches in the past, growing evidence reveals that in cases of limited inflammation, surgery can suffice as an alternative primary treatment. We retrospectively assessed the disease course and outcomes of 103 patients with terminal Ileitis who underwent primary surgery (n = 29) or received primary medical treatment followed by surgery (n = 74). Primary endpoint was the need for immunosuppressive medication after surgical treatment (ileocecal resection, ICR) during a two-years follow-up. Rates for laparoscopic ICR were enhanced in case of early surgery, but no differences were seen for postoperative complications. In case of immunosuppressive medication, patients with ICR at an early state of disease needed significantly less anti-inflammatory medication during the two-year postoperative follow-up compared to patients who were primarily treated medically. Furthermore, in a subgroup analysis for patients with localized ileocecal disease manifestation, early surgery consistently resulted in a decreased amount of medical therapy postoperatively. In conclusion primary ICR is safe and effective in patients with limited CD, and the need for immunosuppressive medication during the postoperative follow-up is low compared to patients receiving surgery at a later stage of disease.
Der hepatische Ischämie-Reperfusionsschaden stellt ein großes Problem in der Transplantations- und Leberchirurgie dar: Insbesondere durch Fibrose, Steatose oder Entzündungsprozesse vorgeschädigte Organe zeigen eine erhöhte Vulnerabilität für den Reperfusionsschaden. Protektive Effekte einer Therapie mit mesenchymalen Stammzellen konnten bereits in Vorversuchen gezeigt werden. Ein direkter Vergleich mit den morphologisch sehr ähnlichen Fibroblasten wurde bisher nicht durchgeführt. Diese Wirkung scheint nach aktuellem Forschungsstand nicht durch zellgebundene, sondern parakrine Effekte vermittelt zu werden. Eine präemptive Injektion von Extrazellulärvesikel aus dem Überstand von Zellkulturen zeigte ähnliche Effekte wie eine Therapie mit Stammzellen. Das in dieser Arbeit durchgeführte Tierversuchsmodell basiert auf einer chirurgisch induzierten 70% Ischämie der Mausleber mit präemptiver Injektion von mesenchymalen Stammzellen, Fibroblasten, sowie deren jeweilige Extrazellulärvesikel. Eine präemptive Therapie mit mesenchymalen Stammzellen und deren Extrazellulärvesikeln verringerte den Leberzellschaden, gemessen anhand der Serumtransaminasenspiegel und Ausprägung der Nekrosefläche innerhalb Ischämie-exponierter Leberabschnitte, und konnte die Leberzellregeneration durch vermehrte Ausbildung von Lipid-Microdroplets und erhöhte Zellproliferationsraten der Hepatozyten bis in die Spätphase des Ischämie-Reperfusionsschadens beschleunigen. In Tieren mit einer präemptiven Injektion von Fibroblasten und deren Extrazellulärvesikel konnten diese Effekte nicht nachgewiesen werden. Es konnte kein Unterschied zwischen einer Therapie mit mesenchymalen Stammzellen und deren Extrazellulärvesikeln festgestellt werden.
Das Mikromilieu solider Tumor (tumor mircoenvironment, TME) weist verschiedene Besonderheiten auf, von denen bekannt ist, dass sie zu Chemotherapieresistenz und Tumorprogression beitragen können. Neben der Extrazellulären Matrix (ECM), den cancer associated cells (CAC) und diversen Entzündungszellen tragen auch chemische und physikalische Besonderheiten (Hypoxie, Azidose, erhöhter Gewebedruck, oxidativer Stress und Nährstoffmangel) zu Tumorprogression und Chemotherapieresistenz bei. Zudem wissen wir, dass Hitzeschock-Proteine (HSPs), Toll-like Rezeptoren (TLRs) und ABC-Transporter mit erhöhter Chemotherapieresistenz und Tumorprogression im Pankreas- und Kolonkarzinom einhergehen.
Hier wurde untersucht, ob ein in vitro induzierter Nährstoffmangel im HT29 Kolonkarzinom, im Panc-1 Pankreaskarzinom und im MIA PaCa-2 Pankreaskarzinom zu einer gesteigerten Expression von HSP70, HSP90, MDR1, ABCB5 und TLR1 bis TLR10 auf mRNA und Proteinebene führt. Zudem wurde unter allen Versuchsbedingungen die Stoffwechselaktivität über einen MTS-Test gemessen. Der Nährstoffmangel wurde über die Kultivierung in einem Hybridomamedium, welches als proteinfreies Medium gilt und über die Kultivierung in einem serumfreien Medium induziert.
Es zeigte sich, dass insbesondere die entdifferenzierte Panc-1 Pankreaskarzinomzelllinie eine erhöhte Resistenz gegenüber dem induzierten Nährstoffmangel aufwies. Auf mRNA-Ebene zeigten sich bei allen drei Tumorzelllinien deutliche Expressionssteigerungen. Diese waren insbesondere im Hybridomamedium nachweisbar und traten beim HT29-Kolonkarzinom nach 48h und im Panc-1 Pankreaskarzinom bereits nach 24h auf. Besonders intensive Expressionssteigerungen konnten im HT29 Kolonkarzinom bei ABCB5, TLR7 und TLR9 nachgewiesen werden. Die Expression von MDR1 war insbesondere im MIA PaCa-2 Pankreaskarzinom gesteigert. Auf Proteinebene konnte im HT29 Kolonkarzinom eine Expressionssteigerung bei HSP90 und TLR6 nachgewiesen werden.
Die Ergebnisse lassen zwei Interpretationen zu. Zum einen könnte über den Nährstoffmangel eine aggressivere Subpopulation selektioniert worden sein. In diesem Zusammenhang konnten die Expressionsdaten des Tumorstammzellmarkers CD133 leider nicht ausgewertet werden. Alternativ kann angenommen werden, dass die untersuchten Tumorzelllinien ihren aggressiven Phänotyp erst unter Nährstoffmangelbedingungen, wie wir sie regelmäßig in soliden Tumoren finden, zur Expression bringen.
Eine retrospektive Analyse von kindlichen Patienten mit duodenaler Obstruktion, welche zwischen dem 01.01.2005 und dem 30.06.2020 im Universitätsklinikum Würzburg in der Abteilung für Kinderchirurgie operativ behandelt wurden. Analyse von Ursachen, Gestationsalter, Geburtsgewicht, Geburtsmodus, Begleitfehlbildungen, Diagnosestellung, operativer Versorgung und aufgetretener Komplikationen.
Duodenale Obstruktion wird meist von duodenalen Atresien und Stenosen verursacht. Es besteht eine Häufung von begleitenden Fehlbildungen wie z.B. einer Trisomie 21, urogenitalen- oder Herzfehlbildungen. Eine Mehrheit der Patienten ist frühgeboren, extreme Unreife ist jedoch selten. Es besteht eine leichte Linksverschiebung des Geburtsgewichtes zur Hypotrophie. Bei korrekter chirurgischer Therapie haben Duodenalatresien und -stenosen eine gute Prognose, welche zumeist von den Begleiterkrankungen limitiert wird.
Background: Obesity is considered a risk factor for postoperative complications as it can limit exposure to the operation field, thereby significantly prolonging surgery time. Obesity-associated comorbidities, such as low-grade systemic inflammation, impaired functional status, and type 2 diabetes, are independent risk factors for impaired anastomotic wound healing and nonsurgical site infections. If obesity itself is an independent risk factor for surgical complications remains controversial, but the reason for this is largely unexplored. Summary: A MEDLINE literature search was performed using the terms: “obesity,” “excess body weight,” and “surgical complications.” Out of 65,493 articles 432 meta-analyses were screened, of which 25 meta-analyses were on the subject. The vast majority of complex oncologic procedures in the field of visceral surgery have shown higher complication rates in obese patients. Meta-analyses from the last 10 to 15 years with high numbers of patients enrolled consistently have shown longer operation times, higher blood loss, longer hospital stay for colorectal procedures, oncologic upper gastrointestinal (GI) procedures, and pancreatic surgery. Interestingly, these negative effects seem not to affect the overall survival in oncologic patients, especially in esophageal resections. A selection bias in oncologic upper GI patients may have influenced the results with higher BMI in upper GI cancer to be a predictor for better nutritional and performance status. Key Messages: Contrary to bariatric surgery, only limited evidence indicated that site and type of surgery, the approach to the abdominal cavity (laparoscopic vs. open), institutional factors, and the type of perioperative care such as ERAS protocols may play a role in determining postsurgical complications in obese patients. The initial question remains therefore partially unanswered. Large nationwide register-based studies are necessary to better understand which aspects of obesity and its related comorbidities define it as a risk factor for surgical complications.