| First Author | Tewari M | Year | 1995 |
| Journal | J Biol Chem | Volume | 270 |
| Issue | 32 | Pages | 18738-41 |
| PubMed ID | 7543896 | Mgi Jnum | J:28042 |
| Mgi Id | MGI:75675 | Doi | 10.1074/jbc.270.32.18738 |
| Citation | Tewari M, et al. (1995) CrmA-inhibitable cleavage of the 70-kDa protein component of the U1 small nuclear ribonucleoprotein during Fas- and tumor necrosis factor-induced apoptosis. J Biol Chem 270(32):18738-41 |
| abstractText | Fas and the type I tumor necrosis factor receptor (TNF-R) are two cell surface receptors that, when stimulated with ligand or cross-linking antibody, trigger apoptotic cell death by a mechanism that has yet to be elucidated. The CrmA protein is a serpin family protease inhibitor than can inhibit interleukin-1 beta converting enzyme (ICE) and ICE-like proteases. We showed previously that expression of CrmA potently blocks apoptosis induced by activation of either Fas or TNF-R, implicating protease involvement in these death pathways (Tewari, M., and Dixit, V.M. (1995) J. Biol. Chem. 270, 3255-3260). Here we report that the 70-kDa component of the U1 small ribonucleoprotein (U1-70 kDa) is a proteolytic substrate rapidly cleaved during both Fas- and TNF-R-induced apoptosis. This cleavage was inhibited by expression of CrmA, but not by expression of an inactive point mutant of CrmA, confirming the involvement of an ICE-like protease. These data for the first time identify U1-70 kDa as a death substrate cleaved during Fas- and TNF-R-induced apoptosis and emphasize the importance of protease activation in the cell death pathway. |
