Identification and molecular cloning of two novel receptors for the cytotoxic ligand TRAIL.

A human receptor for the cytotoxic ligand TRAIL (TRAIL receptor-1, designated DR4) was identified recently as a member of the tumor necrosis factor receptor family. In this report we describe the identification of two additional human TRAIL receptors, TRAIL receptor-2 and TRAIL receptor-3, that belong to the tumor necrosis factor ...
receptor family. Interestingly, TRAIL receptor-2 but not TRAIL receptor-3 contains a cytoplasmic "death domain" necessary for induction of apoptosis and is hence designated death receptor-5 (DR5). Like DR4, DR5 engages the apoptotic pathway independent of the adaptor molecule FADD/MORT1. Because of its lack of a death domain, TRAIL receptor-3 is not capable of inducing apoptosis. However, by competing for TRAIL, it is capable of inhibiting TRAIL-induced apoptosis. Thus, TRAIL receptor-3 may function as an antagonistic decoy receptor to attenuate the cytotoxic effect of TRAIL in most tissues that are TRAIL+, DR4+, and DR5+.
Mesh Terms:
Adaptor Proteins, Signal Transducing, Amino Acid Sequence, Animals, Apoptosis, Arabidopsis Proteins, CASP8 and FADD-Like Apoptosis Regulating Protein, Carrier Proteins, Caspase 1, Caspase 10, Caspases, Cloning, Molecular, Cysteine Endopeptidases, Fas-Associated Death Domain Protein, Fatty Acid Desaturases, Humans, Intracellular Signaling Peptides and Proteins, Molecular Sequence Data, Plant Proteins, Receptors, Cell Surface, Receptors, TNF-Related Apoptosis-Inducing Ligand, Receptors, Tumor Necrosis Factor, Tumor Necrosis Factor Decoy Receptors
J. Biol. Chem.
Date: Oct. 10, 1997
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