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Die im Rahmen der Arbeit erzielten Ergebnisse liefern neue Erkenntnisse über einen neuen Sternzellsubtyp der murinen Leber. Bei Gewebeverletzung differenzieren Sternzellen im Allgemeinen zu Myofibroblasten, welche Extrazellulärmatrix produzieren. Des Weiteren sind Sternzellen die Perizyten der Leber und spielen eine Rolle in der Angiogenese und Gefäßremodellierung.
Der in präliminären Untersuchungen identifizierte Sternzellsubtyp zeichnet sich durch die Expression von tdTomato in Abhängigkeit des SMMHC-Promotors aus (SMMHC/tdTomato\(^+\) Sternzellen). In dieser Arbeit wurden SMMHC/tdTomato\(^+\) Sternzellen immunhistochemisch unter physiologischen und fibrotischen Bedingungen untersucht.
Mit Hilfe von Lineage Tracing konnte zunächst die Zellmauserung der SMMHC/tdTomato\(^+\) Sternzellen gezeigt werden. Durch Leberzonen-spezifische Marker wurde daraufhin nachgewiesen, dass SMMHC/tdTomato\(^+\) Sternzellen in Zone 1 des Leberazinus lokalisiert sind, weswegen diese Zellen im Weiteren „Zone 1-HSC“ genannt wurden. Als potenzielle Progenitorzellnische der Zone 1-HSC wurde das Portalfeld eingegrenzt.
Außerdem wurde die Funktion der Zone 1-HSC in der CCl\(_4\)-induzierten Leberfibrose untersucht. Es stellte sich heraus, dass Zone 1-HSC bereits früh in der Fibrose die Zonierung verlieren und diese auch nach Regenerationszeit nicht wiederhergestellt wird. Es wurde nachgewiesen, dass Zone 1-HSC nicht zu Myofibroblasten differenzieren. Stattdessen spielen Zone 1-HSC möglicherweise eine Rolle in der sinusoidalen Kapillarisierung in Folge einer CCl\(_4\)-induzierten Fibrose.