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- W1567424586 abstract "Protein phosphorylation and dephosphorylation are involved in regulation of cell growth. We tested the hypothesis that the growth inhibitory effect of transforming growth factor beta 1 (TGF-beta 1) involves activation of protein phosphatases. Exposure of human keratinocytes in culture to 400 pM TGF-beta 1 for 48 h led to 80% inhibition of DNA synthesis as measured by nuclear labeling. Incubation of cultured keratinocytes with 400 pM TGF-beta 1 rapidly activated (within 30 min) protein serine/threonine phosphatase, measured using phosphorylase as a substrate. Based on several criteria, including neutralization of activity with specific antibodies and inhibitor-2, TGF-beta 1-activated phosphorylase phosphatase was identified as protein phosphatase 1. TGF-beta 1 did not have rapid effects on protein serine/threonine phosphatase activity (type 2A) measured with histone phosphorylated by protein kinase C or on protein tyrosine phosphatase activity. However, protein tyrosine phosphatase was activated at 48 h, coincident with growth arrest. Differentiation, induced by the combination of TGF-beta 1 plus calcium or by serum, was not accompanied by further serine/threonine or tyrosine phosphatase activation. We conclude that induction of growth arrest in keratinocytes by TGF-beta 1 involves acute activation of protein phosphatase 1, while activation of protein tyrosine phosphatase may represent an additional mechanism for maintaining cells in a growth-arrested state." @default.
- W1567424586 created "2016-06-24" @default.
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- W1567424586 date "1991-02-01" @default.
- W1567424586 modified "2023-09-27" @default.
- W1567424586 title "Growth arrest induced by transforming growth factor beta 1 is accompanied by protein phosphatase activation in human keratinocytes" @default.
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- W1567424586 doi "https://doi.org/10.1016/s0021-9258(19)67815-4" @default.
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