Vitamin D-dependent suppression of endothelin-induced vascular smooth muscle cell proliferation through inhibition of CDK2 activity.

Vitamin D-dependent suppression of endothelin-induced vascular smooth muscle cell proliferation through inhibition of CDK2 activity.
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DOI:
10.1016/j.jsbmb.2009.11.002
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发表时间:
2010-02-15
影响因子:
4.1
通讯作者:
Gardner, David G.
Gardner, David G.
中科院分区:
生物学2区
文献类型:
--
作者:
Chen, Songcang;Law, Christopher S.;Gardner, David G.

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1,25二羟基维生素D3 (1,25 (OH) 2d)及其低高钙类似物已被证明可以抑制培养血管平滑肌细胞(VSMC)的增殖。然而,这种抑制的机制尚不清楚。本研究表明,1,25 (OH) 2d及其类似物(RO-25-6760和RO-23-7553)可抑制新生大鼠主动脉VSMC内皮素(ET)依赖性DNA合成和细胞增殖。虽然ET刺激有丝分裂活性需要激活MEK/ERK信号转导级联,但在这些培养中,1,25 (OH) 2d既不影响ET依赖性的ERK激活,也不与MEK抑制剂PD98059协同减少DNA合成,这表明1,25 (OH) 2d的作用位点位于ERK和细胞周期机制之间。1,25 (OH) 2d抑制et诱导的细胞周期蛋白依赖性激酶2 (Cdk2)的激活,但对该蛋白的表达没有影响。总的来说,这些数据确定Cdk2是细胞周期机制中125 (OH) 2d的靶标,并暗示125 (OH) 2d或其低高钙类似物在治疗涉及血管壁的VSMC增殖障碍中的潜在作用。
1,25 dihydroxyvitamin D3 (1,25 (OH)2 D) and its less hypercalcemic analogues have been shown to inhibit the proliferation of vascular smooth muscle cells (VSMC) in culture. However, the mechanism(s) underlying this suppression is not well understood. Here we have shown that 1,25 (OH)2 D and its analogues (RO-25-6760 and RO-23-7553) inhibit endothelin (ET)-dependent DNA synthesis and cell proliferation in neonatal rat aortic VSMC. While ET stimulation of mitogenic activity requires activation of the MEK/ERK signal transduction cascade, 1,25 (OH)2 D neither affected the ET-dependent activation of ERK nor synergized with the MEK inhibitor PD98059 in reducing DNA synthesis in these cultures, implying that the locus of 1,25 (OH)2 D actions lies between ERK and the cell cycle machinery. 1,25 (OH)2 D suppressed ET-induced activation of cyclin dependent kinase 2 (Cdk2), a key cell cycle kinase, but had no effect on the expression of this protein. Collectively, the data identify Cdk2 as the target of 1,25 (OH)2 D in the cell cycle machinery and imply a potential role for 1,25 (OH)2 D, or its less hypercalcemic analogues, in the treatment of disorders of VSMC proliferation involving the vascular wall.
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