Tumor necrosis factor receptor deficiency exacerbated Adriamycin-induced cardiomyocytes apoptosis: an insight into the Fas connection

Molecular Cancer Therapeutics
Yu-Chin LienDaret K St Clair

Abstract

Cardiomyopathy is a major dose-limiting factor for applications of Adriamycin, a potent chemotherapeutic agent. The present study tested the hypothesis that increased tumor necrosis factor (TNF)-alpha signaling via its receptors protects against Adriamycin-induced cardiac injury. We used mice in which both TNF receptor I and II have been selectively inactivated (DKO) with wild-type mice as controls. Morphometric studies of cardiac tissue following Adriamycin treatment revealed greater ultrastructural damage in cardiomyocyte mitochondria from DKO mice. Biochemical studies of cardiac tissues showed cytochrome c release and the increase in proapoptotic protein levels, suggesting that lack of TNF-alpha receptor I and II exacerbates Adriamycin-induced cardiac injury. The protective role of TNF receptor I and II was directly confirmed in isolated primary cardiomyocytes. Interestingly, following Adriamycin treatment, the levels of Fas decreased in the wild-type mice. In contrast, DKO mice had an increase in Fas levels and its downstream target, mitochondrial truncated Bid. These results suggested that TNF-alpha receptors play a critical role in cardioprotection by suppression of the mitochondrial-mediated associated cell death pathway.

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