Induction of apoptosis by X-linked ectodermal dysplasia receptor via a caspase 8-dependent mechanism.

X-linked ectodermal dysplasia receptor (XEDAR) is a recently isolated member of the tumor necrosis factor receptor family that is highly expressed during embryonic development and binds to ectodysplasin-A2 (EDA-A2). In this report, we demonstrate that although XEDAR lacks a death domain, it nevertheless induces apoptosis in an EDA-A2-dependent fashion. The ...
apoptosis-inducing ability of XEDAR is dependent on the activation of caspase 8 and can be blocked by its genetic and pharmacological inhibitors. Although XEDAR-induced apoptosis can be blocked by dominant-negative Fas-associated death domain (FADD) protein and FADD small interfering RNA, XEDAR does not directly bind to FADD, tumor necrosis factor receptor-associated death domain (TRADD) protein, or RIP1. Instead, XEDAR signaling leads to the formation of a secondary complex containing FADD, caspase 8, and caspase 10, which results in caspase activation. Thus, XEDAR belongs to a novel class of death receptors that lack a discernible death domain but are capable of activating apoptosis in a caspase 8- and FADD-dependent fashion. XEDAR may represent an early stage in the evolution of death receptors prior to the emergence of the death domain and may play a role in the induction of apoptosis during embryonic development and adult life.
Mesh Terms:
Apoptosis, Arabidopsis Proteins, Caspase 10, Caspase 8, Caspases, Cell Line, Ectodysplasins, Edar Receptor, Enzyme Activation, Fatty Acid Desaturases, Humans, Membrane Proteins, Protein Binding, Receptors, Ectodysplasin, Receptors, Tumor Necrosis Factor, Xedar Receptor
J. Biol. Chem.
Date: Oct. 01, 2004
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