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中国临床药理学与治疗学 ›› 2008, Vol. 13 ›› Issue (5): 521-525.

• 基础研究 • 上一篇    下一篇

肾上腺髓质素对新生大鼠缺氧缺血再灌注性脑损伤的保护作用

张士发, 周名雄, 窦常胜, 郭本标   

  1. 皖南医学院弋矶山医院儿科, 芜湖241001, 安徽
  • 收稿日期:2007-11-28 修回日期:2008-01-12 发布日期:2020-11-09
  • 作者简介:张士发, 男, 硕士, 副主任医师, 研究方向:新生儿疾病。Tel:13865537787 E-mail:wuhuzhangsf@163. com
  • 基金资助:
    皖南医学院中青年科研基金(WK200604BF)

Neuroprotection effects of exogenous adrenomedullin against hypoxicischemia/reperfusion brain damage in neonatal rats

ZHANG Shi-fa, ZHOU Ming-xiong, DOU Chang-sheng, GUO Ben-biao   

  1. Department of Pediatrics, Yijishan Hospital, Wannan Medical College, Wuhu 241001, Anhui, China
  • Received:2007-11-28 Revised:2008-01-12 Published:2020-11-09

摘要: 目的:观察外源性肾上腺髓质素(adrenomedullin, AM) 对新生大鼠缺氧缺血再灌注性脑损伤(hypoxic-ischenmia reperfusion brain damage, HIRBD) 的保护作用。方法:40 只7 日龄SD 新生大鼠随机分为正常对照组、缺氧缺血再灌注(HIR) 组、AM 干预组(缺氧缺血后即刻0、 6、 12 h分别给于AM 腹腔注射, 1. 0 mg/kg), 每组8 只, 于术后48 h 处死。取耳间线前2 mm 水平做冠状位脑组织切片, 观察脑组织病理学变化, 同时检测脑组织匀浆一氧化氮合酶(NOS)、 谷胱甘肽(GSH)、 髓过氧化物酶(MPO) 的含量。结果:HIR、 AM 12 h 干预组新生大鼠脑病理改变明显, AM 0、 6 h 干预组的脑病理改变明显减轻。AM 0、 6 h 干预组脑组织中结构型一氧化氮合酶(cNOS)、 GSH 的水平较HIR 组显著增高, 而诱导型一氧化氮合酶(iNOS)、 MPO 的水平较HIR 组显著降低。结论:缺氧缺血再灌注后0 ~ 6 h 予外源性AM 干预对新生大鼠HIRBD 有不同程度的保护作用, 这种作用与其增加体内抗氧化物质GSH 的活性、NO 的释放及抑制中性粒细胞对脑组织的浸润有关。

关键词: 缺氧缺血, 脑, 肾上腺髓质素, 一氧化氮合酶, 谷胱甘肽, 过氧化物酶, 大鼠

Abstract: AIM:To observe the neuroprotection effects exogenous adrenomedullin (AM) against hypoxic- ischemia/reperfusion damage (HIRBD) in neonatal rat models. METHODS:Forty neonatal rats were randomly divided into Control Group (n =8, with sham operation), Hypoxic-ischemia/reperfusion (HIR) Group and Intervention Group (n =8, wth intraperitoneal AM injection 0, 6 and 12 h after making model). All rats were decapitated at 48 hours after reperfusion, and the cerebral slices were made at the 2 mm level in front of the interaural line. The pathobiological changes of brain tissue were observed by the method of HE dye in light microscope, and the levels of nitrogen monoxide synthase (NOS), glutathion (GSH) and myeloperoxidase (MPO) in neonatal rats cerebral tissue were determined by using chromatometry. RESULTS:Hypoxic-ischemia/reperfusion could induce obviously cerebral pathological change which could be improved by AM. The brain tissue levels of cNOS and GSH in AM 0 and 6 h Group were significantly higher than those of HIR Group (P <0. 05). The brain tissue levels of iNOS and MPO in AM 0, 6 h Group were significantly lower than those of HIR Group (P <0. 05). CONCLUSION:The exogenous AM given 0-6 h after hypoxic-ischemia may protect the neonatal rats from HIRBD by enhancing GSH activities and the release of NO, checking the infiltration of neutrophile granulocyte into cerebral tissues.

Key words: hypoxia-ischemia, brain, adrenomedulin, nitricoxide synthase, glutathione, peroxydase, rat

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