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Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Int+J+Clin+Exp+Pathol 2015 ; 8 (5): 5210-6 Nephropedia Template TP
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Ca2+-calcineurin signaling is involved in norepinephrine-induced cardiac fibroblasts activation #MMPMID26191219
Tian CJ; Pang X
Int J Clin Exp Pathol 2015[]; 8 (5): 5210-6 PMID26191219show ga
Cardiac fibroblasts (CFs) activation plays a vital role in cardiac fibrosis. There are some studies demonstrate that norepinephrine (NE, an ?1-adrenoceptor agonist) induced CFs proliferation. But whether Ca2+-calcineurin, a signaling concerned with growth and differentiation in various cell types, is participated in NE-induced CFs activation is unclear. In present study, we determined NE-induced CFs proliferation and differentiation, synthesis of collagen, and calcineurin (CaN) activity, and the effects of phentolamine (Phen, an ?1-adrenoceptor antagonist), verapamil (Ver, a calcium channel blocker) and cyclosporine A (CsA, an inhibitor of CaN) on NE-induced CFs activation. The results showed that NE induced CFs proliferation and differentiation, increased ?-SMA protein expression, increased collagen I, collagen III and fibronectin production, promoted ECM expression, activated CaN and increased CaN protein expression, which were inhibited by Phen, Ver and CsA. In vivo, more collagen deposition could be observed and total collagen volume fraction (CVF) was significantly increased in NE group. Phen, Ver and CsA decreased NE-induced collagen deposition, reduced cardiac fibrosis. Thus, our results demonstrate that Ca2+/CaN is involved in NE-induced CFs proliferation and collagen synthesis.