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孕酮干预对缺氧缺血性脑损伤新生鼠脑组织胶质纤维酸性蛋白表达的影响

王小引   

  1. 新乡医学院
  • 收稿日期:2010-02-08 修回日期:2010-10-01 出版日期:2011-02-15 发布日期:2011-02-15
  • 通讯作者: 王小引

Expression of gial fibrillary acidic protein in Brain Tissue of Newborn Rats with Hypoxic-Ischemic Brain Damage by Progesterone Intervention

  • Received:2010-02-08 Revised:2010-10-01 Published:2011-02-15 Online:2011-02-15

摘要: 摘要 目的: 观察胶质纤维酸性蛋白(GFAP)在缺氧缺血性脑损伤新生鼠脑组织中的表达及孕酮的影响,从分子水平探讨孕酮对新生鼠缺氧缺血性脑病星形胶质细胞的保护机制。方法: 24只7日龄新生Wistar大鼠随机分成3组,每组8只,缺氧缺血组和药物预防组动物先行左侧颈总动脉结扎术,然后将动物置于37 ℃恒温的密闭容器中,以1.5 L/min的速度吸入80 mL/L氧气和920 mL/L氮气的混合气体2.5 h建立缺氧缺血脑病动物模型。假手术组仅分离左侧颈总动脉,不结扎,亦不做缺氧处理。药物预防组动物于建立模型前30 min按8 mg/kg腹腔注射0.5 g/L的孕酮溶液,24 h后动物被全部处死,采用免疫组化和RT-PCR方法检测各组大鼠脑组织中GFAP表达的变化。结果: 各组大鼠星形胶质细胞中都有GFAP表达,缺氧缺血组的GFAP阳性细胞数和GFAP的表达明显高于假手术组假组的阳性细胞数和表达水平(均P<0.05),药物预防组的GFAP阳性细胞数和GFAP mRNA的表达明显低于缺氧缺血组(均P<0.01)。结论: 缺氧缺血性脑损伤可引起新生鼠脑组织GFAP大量表达,孕酮具有抑制缺氧缺血后脑组织星形胶质细胞过度表达,发挥抗缺氧缺血性脑损伤的作用。

关键词: 孕酮, 星形胶质细胞, 胶质纤维酸性蛋白, 缺氧缺血性脑损伤, 新生鼠

Abstract: Abstract Objective: To observe the effect of progesterone on the expression of gial fibrillary acidic protein in brain tissue with hypoxia-ischemia brain damage in neonatal rats, and discuss the protective mechanism of progesterone hypoxic-ischemic encephalopathy of neonatal rats. Methods : Twenty four 7-day-old neonatal rats were randomly divided into three groups: sham-operated group, hypoxia-ischemia group and pretreatment group. Rats in hypoxic-ischemic group and pretreatment groups were subjected to left common carotid artery ligation, then were exposed to 80mL/L oxygen and 920mL/L nitrogen gas in 37℃ closed container for up to 2.5h to establish HIE model. Progesterone was injected intraperitoneally into the pretreatment groups rats respectively at 30 minutes before hypoxia, Solution was injected into the first two groups. All rats were killed at the 24 hour after operations, immunohistochemistry staining and RT-PCR were used to examine the expression of GFAP in brain. Results: GFAP was expressed in every group rat. The number of GFAP positive staining cells and the expression of GFAP in hypoxic-ischemic group were significantly higher than that in the sham-operated group. The number of GFAP positive staining cells and the expression of GFAP in pretreatment group were significantly lower than that in the hypoxic-ischemic group(P<0.01). Conclusion: The hypoxic-ischemic brain damage may induce significant increase of GFAPexpression in brain tissue of neonatal rat. Progesterone can inhibit the raising of astroeyte induced by hypoxia-ischemia brain damage, so it plays protective role by Anti- hypoxic-ischemic brain damage.

Key words: progesterone, astrocytes, gial fibrillary acidic protein, hypoxia-ischemia brain damage, neonatal rats