Phospholipase C-delta1 is a critical target for tumor necrosis factor receptor-mediated protection against adriamycin-induced cardiac injury

Cancer Research
Yu-Chin LienD K St Clair

Abstract

The clinical application of adriamycin, an exceptionally good chemotherapeutic agent, is limited by its dose-related cardiomyopathy. Our recent study showed that tumor necrosis factor-alpha (TNF-alpha) receptors mediated cytoprotective signaling against adriamycin-induced mitochondrial injury and cardiomyocyte apoptosis. In the present study, we investigated the potential targets of TNF receptor-mediated cytoprotective signaling by global genome microarray analysis using wild-type and TNF receptor-deficient mice. Microarray analysis revealed that adriamycin treatment induced the down-regulation of several mitochondrial functions and energy production-related genes in double TNF receptor-deficient mice, notably, phospholipase C-delta1, a protein involved in fatty acid metabolism and calcium regulation. The role of phospholipase C-delta1 in TNF receptor-mediated cardioprotection against adriamycin-induced injury was evaluated by measuring changes in cardiac function using high-frequency ultrasound biomicroscopy. Selective inhibition of phospholipase C activity in wild-type mice by its inhibitor, U73122, exacerbated adriamycin-induced cardiac dysfunction. Inhibition of phospholipase C-delta1 resulted in the significant decrease of...Continue Reading

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