Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces apoptosis in tumor but not normal cells, thus providing therapeutic possibilities for human cancers. However, it is not fully clear how widespread TRAIL receptors are, or how TRAIL signaling is modulated in normal cells. We characterized cell surface expression of TRAIL receptors in normal healthy donor peripheral blood and report that each of the TRAIL receptors are characteristically expressed on restricted cell populations. TRAIL-R1 is distinctively expressed on B-lymphocytes, TRAIL-R2 on monocytes, TRAIL-R3 on neutrophils and most impressively, CD8 + lymphocytes and NKT lymphocytes but not CD4 + lymphocytes express TRAIL-R4.
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