Aging:miR-34b的异常甲基化通过靶向Notch1参与调节血管钙化

2020-02-27 不详 网络

血管钙化是终末期肾病(ESRD)患者心血管和全因死亡率的最重要因素之一。本研究旨在探究miR-34b在体内和体外对血管平滑肌细胞(VSMC)钙化的功能和机制。结果显示,在高无机磷酸盐(Pi)处理的VSMC中以及来源于经5/6肾切除术并高磷酸盐饮食(0.9%Pi,5/6 NTP)的小鼠动脉中,miR-34b的表达被显著抑制。miR-34b的过表达减轻了VSMC的钙化,而VSMC的钙化则通过抑制miR

血管钙化是终末期肾病(ESRD)患者心血管和全因死亡率的最重要因素之一。本研究旨在探究miR-34b在体内和体外对血管平滑肌细胞(VSMC)钙化的功能和机制。

结果显示,在高无机磷酸盐(Pi)处理的VSMC中以及来源于经5/6肾切除术并高磷酸盐饮食(0.9%Pi,5/6 NTP)的小鼠动脉中,miR-34b的表达被显著抑制。miR-34b的过表达减轻了VSMC的钙化,而VSMC的钙化则通过抑制miR-34b的表达而增强。亚硫酸氢盐测序PCR(BSP)发现,由于5/6 NTP以及尿毒症患者的肾钙化钙化,钙化VSMC和钙化动脉中miR-34b DNA上游的CpG位点甲基化。同时,DNA甲基转移酶3a(DNMT3a)的增加导致VSMC中miR-34b的甲基化过高,而5-aza-2'-脱氧胞苷(5-aza)降低了miR-34b的甲基化率并恢复了miR-34b的表达。在VSMC中。当使用DNMT3a siRNA敲低DNMT3a时,可以消除3.5 mM Pi对VSMC钙化的影响。此外,Notch1被确认为miR-34b的功能靶标,并参与了VSMC的钙化过程。

总之,数据显示miR-34b在体内外调节VSMC钙化中起特定作用,这受miR-34b上游DNA甲基化调节并受下游靶基因表达Notch1调节。这些结果表明,miR-34b的调节可能为血管钙化的新型治疗方法提供新的见解。

原始出处:

Xiao Lin, Fuxingzi Li, et al., Aberration methylation of miR-34b was involved in regulating vascular calcification by targeting Notch1. Aging (Albany NY). 2019 May 31; 11(10): 3182–3197. doi: 10.18632/aging.101973

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    2020-12-04 drwjr
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    2020-07-04 smallant2002
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    2020-02-29 karmond
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    2020-02-29 ymljack