Institut für Pharmakologie und Toxikologie
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- (Mouse L-cell) (1)
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Die Plasmamembran Kalzium-ATPase (PMCA) ist ein in den meisten eukaryontischen Zellen exprimiertes Enzym. Sie katalysiert den Transport von Kalziumionen aus der Zelle und besitzt gegenüber Kalzium eine hohe Affinität jedoch geringe Transportkapazität. Trotz der guten biochemischen Charakterisierung der Pumpe ist ihre Funktion in Zellen wie Kardiomyozyten, die zusätzlich über andere Kalzium-Transportsysteme wie den Natrium/Kalzium-Austauscher verfügen, weiterhin unklar. Erste Ergebnisse aus dem eigenen Labor an PMCA-überexprimierenden L6-Myoblasten zeigten einen Einfluss des Enzyms auf deren Wachstum und Differenzierung. Um diese Erkenntnisse auf den Herzmuskel zu übertragen war im Vorfeld ein transgenes Rattenmodel generiert worden, welches die hPMCA4CI unter einem myokardspezifischen Promotor überexprimierte. Dieses Modell stand für die vorliegende Arbeit zur weiteren Charakterisierung zur Verfügung. Untersucht wurde zunächst das Wachstumsverhalten von Primärkulturen neonataler Kardiomyozyten unter Stimulation mit fetalem Kälberserum, Noradrenalin und dem Platelet Derived Growth Factor BB, jeweils im Vergleich zwischen transgenen und Wildtyp-Kardiomyozyten. Dabei zeigte sich ein beschleunigtes Wachstum der PMCA-überexprimierenden Zellen. In einem zweiten Ansatz wurden Untersuchungen angestellt, um die subzelluläre Lokalisation der PMCA innerhalb der Herzmuskelzelle aufzudecken. Dabei wurden im Speziellen die Caveolae als Ort der möglichen Lokalisation untersucht, kleine, ca. 50-100 nm große Einstülpungen der Plasmamembran, mit charakteristischer Lipid- und Proteinzusammensetzung, darunter auch viele Rezeptoren und Signaltransduktionsmoleküle. Insgesamt konnte mit den Methoden der Detergenzextraktion, Doppelimmunfluoreszenz, Präparation Caveolae-reicher Membranen und Immunpräzipitation gezeigt werden, dass die PMCA zu einem großen Teil in Caveolae lokalisiert ist. Zusätzlich konnte in der Immunpräzipitation eine Interaktion der PMCA mit dem Caveolae-assoziierten Zytoskelettprotein Dystrophin dargestellt werden. Zusammenfassend deuten die Ergebnisse darauf hin, dass die PMCA über eine Steuerung der lokalen Kalziumkonzentration im Bereich der Caveolae modulierend in wachstumsregulierende Signaltransduktionswege von Kardiomyozyten eingreifen kann.