The inhibitor of apoptosis (IAP) proteins form a highly conserved gene family that prevents cell death in response to a variety of stimuli. Herein we describe a newly defined murine IAP, designated Tiap, that proved to be a murine homologue of human survivin based on sequence comparison. TIAP has one baculovirus IAP repeat and lacks a C-terminal RING finger motif. TIAP interacted with the processed form of caspase 3 and inhibited caspase-induced cell death. Histological examinations revealed that TIAP is expressed in growing tissues such as thymus, testis, and intestine of adult mice and many tissues of embryos. In in vitro studies, TIAP was induced in splenic T cells activated with anti-CD3 antibody or Con A, and the expression of TIAP was up-regulated in synchronized NIH 3T3 cells at S to G2/M phase of the cell cycle. We propose that during cell proliferation, cellular protective activity may be augmented with inducible IAPs such as TIAP.
- IntestinesAmino Acid SequenceAnimalsApoptosisBase SequenceCell DivisionCloning, MolecularConsensus SequenceConserved SequenceDNA PrimersEmbryo, MammalianEmbryonic And Fetal DevelopmentGene Expression Regulation, DevelopmentalGene LibraryHumansInhibitor Of Apoptosis ProteinsIntestinal MucosaMaleMiceMicrotubule-Associated ProteinsMolecular Sequence DataNeoplasm ProteinsOpen Reading FramesPolymerase Chain ReactionProteinsRepressor ProteinsSpleenSurvivinT-LymphocytesTestisThymus GlandViral Proteins