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- W1599292918 abstract "Thrombomodulin is an endothelial membrane anticoagulant protein that is a cofactor for protein C activation. We have evaluated the expression of thrombomodulin in cultured mouse hemangioma cells before and after treatment with phorbol myristate acetate (PMA), an agent that stimulates protein kinase C. We also isolated a cDNA encoding 481 amino acids of mouse thrombomodulin and the entire 3'-untranslated portion of its mRNA. The deduced amino acid sequence of mouse thrombomodulin is similar to those determined for human and bovine thrombomodulin. An S1 nuclease protection assay was used to measure thrombomodulin mRNA in hemangioma cells. The half-life for thrombomodulin mRNA was 8.9 +/- 1.8 h (S.D.) in cells treated with actinomycin D. Treatment with PMA had no effect on thrombomodulin mRNA levels. Thrombomodulin turnover was evaluated by immunoprecipitation of [35S]methionine-labeled thrombomodulin. The t1/2 was 19.8 +/- 3.9 h (S.D.); PMA treatment decreased the t1/2 to 10.9 +/- 1.1 h (S.D.) while increasing the rate of synthesis to a maximum of 190% of control. Protein C cofactor activity on hemangioma cells was reduced 35 +/- 4% by treatment with PMA within 30 min. This decrease was associated with a parallel decline in cell surface thrombomodulin antigen and with enhanced phosphorylation of thrombomodulin on serine residues. We conclude that thrombomodulin is phosphorylated in response to treatment of hemangioma cells with PMA which leads to decreased protein C cofactor activity and both increased degradation and synthesis of thrombomodulin." @default.
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- W1599292918 date "1988-10-01" @default.
- W1599292918 modified "2023-09-26" @default.
- W1599292918 title "The structure and function of mouse thrombomodulin. Phorbol myristate acetate stimulates degradation and synthesis of thrombomodulin without affecting mRNA levels in hemangioma cells." @default.
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- W1599292918 doi "https://doi.org/10.1016/s0021-9258(19)37661-6" @default.
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