title: Caspase-2: the orphan caspase.
abstract: Despite an abundance of literature on the role of caspase-2 in apoptosis, there exists much controversy about this protease making it difficult to place caspase-2 correctly in the apoptotic cascade, and hence its role in apoptosis remains unclear. The identification of the PIDDosome as a signaling platform for caspase-2 activation prompted intense investigation into the true role of this orphan caspase. What has emerged is the idea that caspase-2 may not be mandatory for apoptosis and that activation of this caspase in response to some forms of stress has other effects on the cell such as regulation of cell cycle progression. This idea is particularly relevent to the discovery that caspase-2 may act as a tumor suppressor. Here, we discuss the proposed mechanisms through which caspase-2 signals, in particular those involving PIDD, and their impact on cellular fate.
authors.affiliation: Center for Cell and Gene Therapy, Houston, TX, USA.
authors.forename: L
authors.initials: L
authors.lastname: Bouchier-Hayes
authors.forename: D R
authors.initials: DR
authors.lastname: Green
mesh_terms: D000375:Aging / Q000235:genetics; D000818:Animals; D017209:Apoptosis / Q000235:genetics*; D053143:Caspase 2 / Q000737:chemistry / Q000378:metabolism*; D002453:Cell Cycle / Q000235:genetics; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000378:metabolism*; D004249:DNA Damage / Q000235:genetics; D053418:Death Domain Receptor Signaling Adaptor Proteins / Q000378:metabolism*; D004789:Enzyme Activation; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism; D006801:Humans; D051379:Mice; D015398:Signal Transduction; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D053418:Death Domain Receptor Signaling Adaptor Proteins; D018841:HSP90 Heat-Shock Proteins; C485896:PIDD1 protein, human; D016159:Tumor Suppressor Protein p53; C490360:CASP2 protein, human; D053143:Caspase 2; D003546:Cysteine Endopeptidases
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