The Journal of Immunology, Vol 156, Issue 12 4622-4630, Copyright © 1996 by American Association of Immunologists

ARTICLES

An N-terminal domain shared by Fas/Apo-1 (CD95) soluble variants prevents cell death in vitro

G Papoff, I Cascino, A Eramo, G Starace, DH Lynch and G Ruberti
Department of Immunobiology, Institute of Cell Biology, National Research Council, Rome, Italy.

Fas/Apo-1 molecule, also designated as CD95, is a member of the TNF receptor family. Fas cross-linking by its natural ligand or by agonistic mAbs results in rapid induction of apoptosis in susceptible cells. in addition to the Fas full-length mRNA, human activated PBMC and tumor cell lines express several mRNA Fas variants that derive from alternative splicing of the primary transcript. All five variants identified, two of which are newly described here, code for soluble proteins that, with the exception of FasTMDel, are truncated in the extracytoplasmic region and possess short C-terminal amino acid sequences corresponding to a different reading frame. We have identified Abs that recognize all splicing variants and established a sandwich ELISA by which the soluble Fas molecules could be detected in culture supernatants of transfected cell lines and in PBMC following T cell activation. Next, we have studied in detail the functional role of these variants by apoptosis inhibition studies. We found that all soluble proteins block the apoptosis induced by either an agonistic Ab or, more importantly, by the natural Fas ligand in Fas-positive sensitive cell lines. interestingly, this functional property can be assigned to the first 49 amino acids of the mature protein that is the only region shared by the five soluble Fas molecules.

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