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The tumor necrosis factor signaling complex: choosing a path toward cell death or cell proliferation.

Signal transduction pathways which are initiated by the tumor necrosis factor (TNF) utilize receptors which are devoid of intrinsic catalytic activity. Recently identified two families of proteins that directly associate with the cytoplasmic domains of the TNF receptor family members, have partially bridged a molecular gap within the TNF-induced signaling pathways. Clearly, there are numerous alternate routes that originate from the TNF ligand-receptor assembly and terminate on the diverse cellular responses, including proliferation, differentiation, or death. This review focuses on recent advances characterizing the TNF ligand-receptor signaling network, which allow to better understand its participation in a life-death balance within the target cell.