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Critical Reviews™ in Immunology

Impact factor: 3.889

ISSN Print: 1040-8401
ISSN Online: 2162-6472

Critical Reviews™ in Immunology

DOI: 10.1615/CritRevImmunol.v25.i1.30
pages 31-58

The Caspase-8 Modulator c-FLIP

Takao Kataoka
Center for Biological Resources and Informatics, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan

ABSTRACT

Death receptors belong to the tumor necrosis factor receptor superfamily and can induce apoptosis through activation of procaspase-8. The cellular FLICE-inhibitory protein (c-FLIP) is able to modulate activation of procaspase-8 and thereby prevents induction of apoptosis mediated by death receptors. As an important modulator of caspase-8, c-FLIP regulates life and death in various types of normal cells and tissues, such as lymphoid cells, and renders resistance to death receptor-mediated apoptosis in many types of cancer cells. In addition to an apoptosis modulator, c-FLIP has been shown to exert other physiological functions related to cell proliferation and tumorigenesis. Dysregulation of c-FLIP expression has been shown to be associated with various diseases, such as cancer and autoimmune diseases, and c-FLIP might be a critical target for therapeutic intervention. This review focuses on recent findings about the physiological function and intracellular regulation of c-FLIP.