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- W4313331850 abstract "Abstract p38 mitogen-activated protein kinase (MAPK) (p38) is involved in various cellular responses, including LPS stimulation of monocytes, resulting in production of proinflammatory cytokines such as TNF-α. However, the function of p38 during antigenic stimulation of T cells is largely unknown. Stimulation of the human Th cell clone HA-1.70 with either the superantigen staphylococcal enterotoxin B (SEB) or with a specific antigenic peptide resulted in p38 activation and the release of TNF-α. MAPK-activated protein kinase-2 (MAPKAPK-2), an in vivo substrate for p38, was also activated by T cell signaling. SB 203580, a selective inhibitor of p38, blocked p38 and MAPKAPK-2 activation in the T cell clone but did not completely inhibit TNF-α release. PD 098059, a selective inhibitor of MAPK kinase 1 (MEK1), blocked activation of extracellular signal-regulated kinase (ERK) and partially blocked TNF-α production by the clone. In human peripheral T cells, p38 was not activated by SEB, but rather by CD28 cross-linking, whereas in the human leukemic T cell line Jurkat, p38 was activated by CD3 and CD28 cross-linking in an additive fashion. TNF-α production by peripheral T cells in response to SEB and anti-CD28 mAb correlated more closely with ERK activity than with p38 activity. Therefore, various forms of T cell stimulation can activate the p38 pathway depending on the cells examined. Furthermore, unlike LPS-stimulated monocytes, TNF-α production by T cells is only partially p38-dependent." @default.
- W4313331850 created "2023-01-06" @default.
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- W4313331850 date "1999-01-15" @default.
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- W4313331850 title "T Cell Activation Signals Up-Regulate p38 Mitogen-Activated Protein Kinase Activity and Induce TNF-α Production in a Manner Distinct from LPS Activation of Monocytes" @default.
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- W4313331850 doi "https://doi.org/10.4049/jimmunol.162.2.659" @default.
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