Effects of low level of methylmercury on proliferation of cortical progenitor cells

Effects of low level of methylmercury on proliferation of cortical progenitor cells
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低水平甲基汞对皮质祖细胞增殖的影响

DOI:
10.1016/j.brainres.2010.08.069
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发表时间:
2010
期刊:
影响因子:
2.9
通讯作者:
Xiao
Xiao
中科院分区:
医学3区
文献类型:
--
作者:
Mingyu Xu;Chonghuai Yan;Ying Tian;Xiao;Xiao

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甲基汞 (MeHg) 是一种强效环境神经毒素,对发育中的中枢神经系统 (CNS) 具有毒性,即使接触水平较低也会对儿童造成脑损伤。然而,其对中枢神经系统影响的机制尚不清楚。目前的研究以胚胎大脑皮层祖细胞的原代培养物作为模型系统,研究甲基汞对神经祖细胞的潜在影响及其潜在机制。结果表明,在培养的皮质祖细胞中,暴露于低水平 MeHg(分别为 2.5nM、5nM 和 50nM)48 小时会以剂量依赖性方式导致 G1/S 细胞周期停滞,但不会诱导细胞死亡。有趣的是,促进 G1/S 转变的细胞周期蛋白 E 的表达,而不是细胞周期蛋白 D1 和 CDK2,通过暴露 MeHg 选择性下调。此外,低水平的 MeHg 可能通过消除 bFGF 诱导的晚期 ERK1/2 激活来抑制 ERK1/2 磷酸化的维持。因此,MeHg 可能通过调节细胞周期蛋白 E 表达并扰乱涉及 ERK1/2 的途径来诱导神经祖细胞的增殖抑制和细胞周期停滞。
Methylmercury (MeHg) is a potent environmental neurotoxin that shows toxicity to developing central nervous system (CNS), causing brain damage in children even at low exposure levels. However, the mechanisms for its effect on CNS are not well understood. In current study, primary cultures of progenitor cells from embryonic cerebral cortex were used as a model system to study the potential effect and the underlying mechanism of MeHg on neural progenitor cells. Results showed that, in cultured cortical progenitor cells, 48-h exposure to low-level of MeHg (at 2.5nM, 5nM and 50nM, respectively) caused G1/S cell cycle arrest in a dose-dependent manner without inducing cell death. Interestingly, the expression of cyclin E, which promotes G1/S transition, but not cyclin D1 and CDK2, was selectively downregulated by exposure of MeHg. In addition, low-level of MeHg inhibited the maintenance of ERK1/2 phosphorylation, possibly by abolishing the late phase ERK1/2 activation induced by bFGF. Thus, MeHg may induce proliferation inhibition and cell cycle arrest of neural progenitor cells via regulating cyclin E expression and perturbing a pathway that involves ERK1/2.
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