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- W2069132262 abstract "Lactacystin, a microbial metabolite that inhibits protease activity only in the proteasome, was used to study the role of the proteasome in the activation-induced cell death (AICD) of T cells. Lactacystin induces DNA fragmentation and apoptosis in a T cell hybridoma (DO.11.10) in a dose-dependent manner. Between 1 and 10 μM, the mildly cytotoxic lactacystin inhibited the AICD of DO.11.10 cells cultured in anti-CD3-coated wells. Degradation of IκBβ and the translocation of the NF-κB (p50/RelA) into the nucleus, which occurred at 1.5 hr after anti-CD3 activation, were inhibited by lactacystin. Lactacystin did not inhibit the expression of nuclear transcription factor Oct-1. The activation-induced expression of the immediate–early gene, Nur77, and the T cell death genes, CD95 (Fas) and CD95 ligand (FasL), were inhibited. Functional expression of FasL cytotoxicity and the increase of cell surface Fas were also inhibited. Lactacystin must be added within 2 hr of activation to efficiently block AICD. In addition, lactacystin failed to inhibit the killing of DO.11.10 by FasL-expressing allo-specific cytotoxic effector cells. These observations strongly suggest a direct link between the proteasome-dependent degradation of IκBβ and the AICD that occurs through activation of the FasL gene and up-regulation of the Fas gene." @default.
- W2069132262 created "2016-06-24" @default.
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- W2069132262 date "1997-07-08" @default.
- W2069132262 modified "2023-10-18" @default.
- W2069132262 title "Proteasome regulation of activation-induced T cell death" @default.
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- W2069132262 doi "https://doi.org/10.1073/pnas.94.14.7515" @default.
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