Novel interactions between NFATc1 (Nuclear Factor of Activated T cells c1) and STAT-3 (Signal Transducer and Activator of Transcription-3) mediate G protein-coupled receptor agonist, thrombin-induced biphasic expression of cyclin D1, with first phase influencing cell migration and second phase directing cell proliferation.

The Journal of Biological Chemistry
Venkatesh Kundumani-SridharanGadiparthi N Rao

Abstract

Thrombin, a G protein-coupled receptor agonist, induced a biphasic expression of cyclin D1 in primary vascular smooth muscle cells. Although both phases of cyclin D1 expression require binding of the newly identified cooperative complex, NFATc1·STAT-3, to its promoter, the second phase, which is more robust, depends on NFATc1-mediated recruitment of p300 onto the complex and the subsequent acetylation of STAT-3. In addition, STAT-3 is tyrosine-phosphorylated in a biphasic manner, and the late phase requires NFATc1-mediated p300-dependent acetylation. Furthermore, interference with acetylation of STAT-3 by overexpression of acetylation null STAT-3 mutant led to the loss of the late phase of cyclin D1 expression. EMSA analysis and reporter gene assays revealed that NFATc1·STAT-3 complex binding to the cyclin D1 promoter led to an enhanceosome formation and facilitated cyclin D1 expression. In the early phase of its expression, cyclin D1 is localized mostly in the cytoplasm and influenced cell migration. However, during the late and robust phase of its expression, cyclin D1 is translocated to the nucleus and directed cell proliferation. Together, these results demonstrate for the first time that the dual function of cyclin D1 in c...Continue Reading

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Citations

May 28, 2013·Cellular Signalling·Shougang Zhuang
Mar 15, 2015·Cancer Letters·Jiawei ShouHongming Pan
May 3, 2019·Arteriosclerosis, Thrombosis, and Vascular Biology·Suresh GovatatiGadiparthi N Rao
Jul 21, 2017·Current Opinion in Lipidology·Austin Gay, Dwight A Towler
Jul 31, 2019·Experimental and Molecular Pathology·Xi LiuZhi-Qiang Luo

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