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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

3,3',5'-Triiodothyronine inhibits collagen-induced human platelet aggregation.

To clarify further the activity of rT3, we examined the effect of rT3 on collagen-induced platelet activation as reflected by aggregation, serotonin release, and protein phosphorylation. rT3, T4, T3, and triiodothyroacetic acid inhibited collagen-induced platelet aggregation and serotonin release from platelets in a dose-dependent manner. However, thyronine did not inhibit collagen-induced platelet aggregation. The concentration at which rT3 inhibited by 50% collagen-induced platelet aggregation was 30 +/- 4 (mean +/- SE) mumol/L. rT3, T4, and T3 did not differ significantly in their abilities to inhibit platelet aggregation. Moreover, rT3 inhibited collagen-induced phosphorylation of the 20-kilodalton protein ( myosin light chain) in platelets. In contrast, rT3 did not inhibit 12-O-tetradecanoylphorbol 13-acetate (TPA)- or thrombin-induced platelet aggregation and inhibited only minimally TPA-induced 40-kilodalton protein phosphorylation. These results suggest that rT3 inhibits collagen-induced platelet activation by inhibiting the activity of myosin light chain kinase and that it may be interesting to investigate some kinds of activity of rT3.[1]


  1. 3,3',5'-Triiodothyronine inhibits collagen-induced human platelet aggregation. Masaki, H., Nishikawa, M., Urakami, M., Yoshimura, M., Toyoda, N., Mori, Y., Yoshikawa, N., Inada, M. J. Clin. Endocrinol. Metab. (1992) [Pubmed]
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