Role of sex hormones and their receptors on gastric Nrf2 and neuronal nitric oxide synthase function in an experimental hyperglycemia model.

Role of sex hormones and their receptors on gastric Nrf2 and neuronal nitric oxide synthase function in an experimental hyperglycemia model.
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DOI:
10.1186/s12876-020-01453-2
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发表时间:
2020-09-23
影响因子:
2.4
通讯作者:
Gangula PR
Gangula PR
中科院分区:
医学4区
文献类型:
--
作者:
Sprouse J;Sampath C;Gangula PR

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胃轻瘫,一种胃排空异常的情况,最常见于糖尿病妇女。迄今为止,卵巢激素和/或胃激素受体在调节氮能介导的胃运动中的作用仍不明确。本研究的目的是探讨性激素/其受体是否能减弱体外高血糖(HG)暴露的胃神经肌肉组织中核因子(红细胞衍生2)样2 (Nrf2)、神经元一氧化氮合酶(nNOS)的表达和氮能松弛。在存在或不存在选择性雌激素受体(ERα /PPT或ERβ: DPN)的情况下,将成年雌性C57BL/ 6j小鼠的胃神经肌肉切片置于正常血糖(NG, 5 mM)或高血糖(30 mM或50 mM)条件下孵育;或非选择性性激素受体拮抗剂(ER/ICI 182780,或孕激素受体(PR)/ RU486) 48小时。观察胃循环神经肌条mRNA、蛋白表达及氮能松弛程度。我们在HG中发现,与NG相比,胃标本中ER、Nrf2和nNOS的表达显著降低。此外,性激素和/或其激动剂在体外处理显著(*p < 0.05)恢复Nrf2/nNOSα表达和总亚硝酸盐产量。相反,ER(而非PR)拮抗剂显著降低Nrf2/nNOSα表达和氮能松弛。我们的数据表明,内质网可以通过改善实验性高血糖中Nrf2/nNOS的表达来调节氮能功能。
Gastroparesis, a condition of abnormal gastric emptying, is most commonly observed in diabetic women. To date, the role of ovarian hormones and/or gastric hormone receptors on regulating nitrergic-mediated gastric motility remains inconclusive. The purpose of this study is to investigate whether sex hormones/their receptors can attenuate altered Nuclear factor (erythroid-derived 2)-like 2 (Nrf2), neuronal Nitric Oxide Synthase (nNOS) expression and nitrergic relaxation in gastric neuromuscular tissues exposed to in-vitro hyperglycemia (HG). Gastric neuromuscular sections from adult female C57BL/6 J mice were incubated in normoglycemic (NG, 5 mM) or hyperglycemic (30 mM or 50 mM) conditions in the presence or absence of selective estrogen receptor (ER) agonists (ERα /PPT or ERβ: DPN); or non-selective sex hormone receptor antagonists (ER/ICI 182,780, or progesterone receptor (PR)/ RU486) for 48 h. mRNA, protein expression and nitrergic relaxation of circular gastric neuromuscular strips were assessed. Our findings in HG, compared to NG, demonstrate a significant reduction in ER, Nrf2, and nNOS expression in gastric specimens. In addition, in-vitro treatment with sex hormones and/or their agonists significantly (*p < 0.05) restored Nrf2/nNOSα expression and total nitrite production. Conversely, ER, but not PR, antagonist significantly reduced Nrf2/nNOSα expression and nitrergic relaxation. Our data suggest that ER’s can regulate nitrergic function by improving Nrf2/nNOS expression in experimental hyperglycemia.
糖尿病相关的血红素加氧酶系统诱导以及不同肠段肌间神经元中血红素加氧酶 1 和 2 与神经元一氧化氮合酶的共定位增强。
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