PubMed:10092091 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/10092091","sourcedb":"PubMed","sourceid":"10092091","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/10092091","text":"NF-kappaB regulates Fas/APO-1/CD95- and TCR- mediated apoptosis of T lymphocytes.\nThe maintenance of lymphocyte homeostasis by apoptosis is a critical regulatory mechanism in the normal immune system. The transcription factor NF-kappaB has been shown to play a role in protecting cells against death mediated by TNF We show here that NF-kappaB also has a role in regulating Fas/APO-1/CD95-mediated death, a major pathway of peripheral T cell death. Transfection of Jurkat cells with the NF-kappaB subunits p50 and p65 confers resistance against Fas-mediated apoptosis. Reciprocally, inhibition of NF-kappaB activation by a soluble peptide inhibitor or a dominant form of the NF-kappaB inhibitor, IkappaB, makes the cells more susceptible to Fas-mediated apoptosis. Furthermore, inhibition of NF-kappaB activation by a soluble peptide inhibitor rendered a T cell hybridoma more susceptible to TCR-mediated apoptosis. Correspondingly, transfection of p50 and p65 provided considerable protection from TCR-mediated apoptosis. These observations were corroborated by studies on Fas-mediated death in primary T cells. Concanavalin A-activated cycling T cell blasts from mice that are transgenic for the dominant IkappaB molecule have increased sensitivity to Fas-mediated apoptosis, associated with a down-regulation of NF-kappaB complexes in the nucleus. In addition, blocking TNF, itself a positive regulator of NF-kappaB, with neutralizing antibodies renders the cells more susceptible to anti-Fas-mediated apoptosis. In summary, our results provide compelling evidence that NF-kappaB protects against Fas-mediated death and is likely to be an important regulator of T cell homeostasis and 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