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Pubmed ID :15735649
Publication Date : //

The autoimmune suppressor Gadd45alpha inhibits the T cell alternative p38 activation pathway.


The p38 MAP kinase (MAPK) is phosphorylated and activated by upstream MAPK kinases. T cells have an alternative pathway in which T cell receptor-activated tyrosine kinase Zap70 phosphorylates p38 on Tyr323. Mice lacking Gadd45alpha, a small p38-binding molecule, develop a lupus-like autoimmune disease. Here we show that resting T cells but not B cells from Gadd45a(-/-) mice had spontaneously increased p38 activity in the absence of 'upstream' MAPK kinase activation. The p38 from resting Gadd45a(-/-) T cells was spontaneously phosphorylated on Tyr323, and its activity was specifically inhibited by recombinant Gadd45alpha in vitro. Thus, constitutive activation of T cell p38 through the alternative pathway is prevented by Gadd45alpha, the absence of which results in p38 activation, T cell hyperproliferation and autoimmunity.

Authors : Salvador Jesus M , Mittelstadt Paul R , Belova Galina I , Fornace Albert J , Ashwell Jonathan D ,

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