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Death receptor signals to mitochondria Khosravi-Far R; Esposti MDCancer Biol Ther 2004[Nov]; 3 (11): 1051-7Apoptosis is the best-characterized form of programmed cell death (PCD) and is of fundamental importance in tissue homeostasis. In mammalian systems, there are two major pathways that are involved in the initiation of apoptosis: the "extrinsic" death receptor pathway and the "intrinsic" mitochondrial pathway. Although these pathways act independently to initiate the death machinery in some cellular systems, in many cell types, including numerous tumor cells, there is delicate coordination and cross talk between the extrinsic and intrinsic pathways, which leads to the activation of the executioner caspase cascade. Additionally, there appears to be a fine balance between the caspase-mediated arm of death receptor signaling that engages mitochondria and the caspase-independent arm that promotes vacuole proliferation in many cells. Here, we review our current knowledge about the layers of complexity that are posed by the interactions between death receptor-induced pathways and how they influence mitochondria to regulate cellular life and death decisions.|*Signal Transduction[MESH]|Animals[MESH]|Apoptosis/*physiology[MESH]|Humans[MESH]|Mitochondria/*physiology[MESH]|Receptor Cross-Talk[MESH]|Receptors, Tumor Necrosis Factor/*physiology[MESH]|fas Receptor/*genetics[MESH] |
