Abstract
Toxicity of chemotherapeutic agents against cancer cells is mediated through the initiation of programmed cell death. Apoptosis is an evolutionarily conserved cascade of intracellular proteolytic events propagated by a family of cysteine proteases called caspases. Many receptor- and non-receptor-mediated death signals induce apoptosis via activation of caspase-8 (FLICE/MACH). Mechanisms of tumor resistance to cytotoxic drugs through decreased apoptosis may occur by altered expression of caspase-8, upregulation of caspase-8 inhibitors like FLIP (FLICE-like Inhibitory Protein), or sequestration of caspase-8 by Bcl-2. Modulation of caspase-8 and apoptosis may be a therapeutic strategy for sensitization of drug-resistant malignancies to radiation or combination chemotherapy.
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