期刊
JOURNAL OF PHYSIOLOGY-LONDON
卷 601, 期 8, 页码 1501-1514出版社
WILEY
DOI: 10.1113/JP284336
关键词
hypoxia; miR-210; mitochondria; preeclampsia; pregnancy; reactive oxygen species; STOCs; TET2
Hypoxia during pregnancy impairs uterine vascular adaptation through the miR-210-TET2-mtROS pathway, leading to mitochondrial dysfunction and increased generation of mitochondrial reactive oxygen species (mtROS). TET2, a regulator of inflammation and oxidative stress, is downregulated in uterine arteries under gestational hypoxia and is targeted by miR-210. Knockdown of TET2 inhibits STOCs, increases mtROS, and elevates myogenic tone, while overexpression of TET2 reverses the effects of hypoxia and miR-210-induced mtROS.
Hypoxia during pregnancy impairs uterine vascular adaptation via microRNA-210 (miR-210)-mediated mitochondrial dysfunction and mitochondrial reactive oxygen species (mtROS) generation. TET methylcytosine dioxygenase 2 (TET2) participates in regulating inflammation and oxidative stress and its deficiency contributes to the pathogenesis of multiple cardiovascular diseases. Thus, we hypothesize a role of TET2 in hypoxia/miR-210-mediated mtROS suppressing spontaneous transient outward currents (STOCs) in uterine arteries. We found that gestational hypoxia downregulated TET2 in uterine arteries of pregnant sheep and TET2 was a target of miR-210. Knockdown of TET2 with small interfering RNAs suppressed mitochondrial respiration, increased mtROS, inhibited STOCs and elevated myogenic tone. By contrast, overexpression of TET2 negated hypoxia- and miR-210-induced mtROS. The effects of TET2 knockdown in uterine arteries on mtROS, STOCs and myogenic contractions were blocked by the mitochondria-targeted antioxidant MitoQ. In addition, the recovery effects of inhibiting endogenous miR-210 with miR-210-LNA on hypoxia-induced suppression of STOCs and augmentation of myogenic tone were reversed by TET2 knockdown in uterine arteries. Together, our study reveals a novel mechanistic link between the miR-210-TET2-mtROS pathway and inhibition of STOCs and provides new insights into the understanding of uterine vascular maladaptation in pregnancy complications associated with gestational hypoxia.
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