Tumor necrosis factor receptor superfamily member 1A (TNFRSF1A) in teleosts; also known as TNFR1
This subfamily of TNFRSF1 ((also known as type I TNFR, TNFR1, DR1, TNFRSF1A, CD120a, p55) is found in teleosts. It binds TNF-alpha, through the death domain (DD), and activates NF-kappaB, mediates apoptosis and activates signaling pathways controlling inflammatory, immune, and stress responses. It mediates signal transduction by interacting with antiapoptotic protein BCL2-associated athanogene 4 (BAG4/SODD) and adaptor proteins TRAF2 and TRADD that play regulatory roles. The human genetic disorder called tumor necrosis factor associated periodic syndrome (TRAPS), or periodic fever syndrome, is associated with germline mutations of the extracellular domains of this receptor, possibly due to impaired receptor clearance. Serum levels of TNFRSF1A are elevated in schizophrenia and bipolar disorder, and high levels are also associated with cognitive impairment and dementia. Knockout studies in zebrafish embryos have shown that a signaling balance between TNFRSF1A and TNFRSF1B is required for endothelial cell integrity. TNFRSF1A signals apoptosis through caspase-8, whereas TNFRSF1B signals survival via NF-kappaB in endothelial cells. Thus, this apoptotic pathway seems to be evolutionarily conserved, as TNFalpha promotes apoptosis of human endothelial cells and triggers caspase-2 and P53 activation in these cells via TNFRSF1A.
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