JCEM:JMJD6组蛋白去甲基化酶活性受损影响了先兆子痫VHL基因的表达

2018-01-28 MedSci MedSci原创

大家都知道von Hippel Lindau(VHL)蛋白是细胞缺氧反应的关键执行者,其在先兆子痫这种妊娠中发病率5%-7%的疾病中表现受损。迄今为止,控制VHL基因在人胎盘中表达的机制仍不清楚。近日在JCEM上发表的一篇文章则旨在研究正常妊娠和先兆子痫(一种以胎盘缺氧为特征的病理)的VHL表观遗传调节机制。

大家都知道von Hippel Lindau(VHL)蛋白是细胞缺氧反应的关键执行者,其在先兆子痫这种妊娠中发病率5%-7%的疾病中表现受损。迄今为止,控制VHL基因在人胎盘中表达的机制仍不清楚。近日在JCEM上发表的一篇文章则旨在研究正常妊娠和先兆子痫(一种以胎盘缺氧为特征的病理)的VHL表观遗传调节机制。

研究人员获得了来自早发型(E-PE:n = 56;妊娠<34周)和迟发性先兆子痫(L-PE:n = 19;妊娠≥34周)的胎盘组织。将来自健康血压正常的年龄匹配的早产和足月妊娠的胎盘(PTC:n = 43; TC:n = 23)作为对照。研究人员测定了包含蛋白质6 (JMJD6)的Jumonji域的活性,这是一种Fe2+和氧的组蛋白酶,并在VHL的表观遗传控制中检测了它的功能。

研究结果显示JMJD6在人类胎盘中调节VHL基因表达。由于缺氧和Fe2+生物可得性的减少,VHL在先兆子痫患者中的下调是依赖于JMJD6的去甲基化酶活性的减少。染色质免疫沉淀分析提示JMJD6及其组蛋白靶标与VHL启动子的关联减少。在使用FG-4592的小鼠药理性缺氧模型中证实了先兆子痫的发现。来自FG-4592处理的小鼠胎盘表现出VHL水平的降低,伴随着胎盘形态改变和幼崽重量的减轻。值得注意的是,在E-PE和FG-4592处理的小鼠中,Fe2+的补充可以缓解JMJD6组蛋白去甲基化酶的活性。

上述研究揭示了VHL的新型表观遗传的调控及其对先兆子痫中氧和铁稳态改变的功能性后果。

原始出处:

Sruthi Alahari.et al. Compromised JMJD6 histone demethylase activity impacts on VHL gene repression in preeclampsia. J Clin Endocrinol Metab. 2017.

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    2018-10-12 achengzhao
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    2018-06-02 smallant2015
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    2018-09-10 Eleven21
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    2018-01-30 xqptu