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CRH在脑梗塞相关胃肠屏障破坏中的作用
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摘要
目的:研究CRH在脑梗塞相关胃肠屏障破坏中的作用及其途径。
     方法:雄性Wistar大鼠60只,随机分为空白组(B组)、伪手术组(C组)、脑梗塞组(Ⅰ组)、脑梗塞+脑室α-螺旋-CRH(9-41)组(Aic组)、脑梗塞+腹腔CRH组(H组)、脑梗塞+腹腔α-螺旋-CRH(9-41)组(Aip组),每组10只。留尿检测尿肾上腺素、去甲肾上腺素、皮质醇含量及蔗糖排出率,造模后24小时行血浆二胺氧化酶(DAO)活性、血浆D-乳酸(D-lac)浓度、血浆内毒素(LPS)浓度检测;行胃大体Guth评分,光镜下对胃肠粘膜病理形态进行观察;WesternBlot法检测下丘脑、胃、空肠、结肠CRH蛋白的表达;免疫组化法进行胃肠CRH蛋白定位,Realtime-PCR法检测下丘脑、胃、空肠、结肠CRHmRNA的表达。
     结果:Ⅰ组、Aic组、H组和Aip组的大鼠行为学证实均出现脑梗塞。各组应激强度指标24小时尿肾上腺素、去甲肾上腺素、皮质醇含量变化趋势一致:Ⅰ组≈H组≈Aip组>Aic组≈C组≈B组。各组尿蔗糖排出率、胃大体、光镜下评分和下丘脑CRH含量、CRHmRNA含量变化趋势一致:Ⅰ组≈Aip组>Aic组≈H组≥C组≈B组。各组血浆LPS、D-乳酸、二胺氧化酶活性和空肠、结肠CRH含量、CRHmRNA含量变化趋势一致:Ⅰ组>Aip组≥Aic组≈H组≥C组≈B组。24小时尿肾上腺素、去甲肾上腺素、皮质醇含量、尿蔗糖排出率、胃大体评分和下丘脑CRH含量正相关。血浆LPS、D-乳酸、二胺氧化酶活性和空肠CRH含量正相关。
     结论:(1)脑梗塞时,HPA轴和SNS激活,下丘脑和胃肠组织的CRH蛋白含量升高,胃肠道的通透性增加,粘膜屏障破坏。(2)脑梗塞相关的胃肠屏障破坏与皮质醇及儿茶酚胺存在因果关系的可能性极小。(3)CRH是脑梗塞相关胃肠屏障破坏的重要因素。可以通过对CRH的干涉调控应激,减轻急性疾病患者的应激性胃肠屏障损伤。(4)中枢使用CRH受体拮抗剂能缓解脑梗塞相关的胃肠屏障破坏。(5)外周使用CRH受体拮抗剂能缓解脑梗塞相关的肠屏障破坏而不能缓解脑梗塞相关的胃屏障破坏。(6)脑梗塞后外周给予CRH会抑制脑内和胃肠道局部的CRH蛋白的转录和表达。(7)脑梗塞相关的胃屏障破坏和下丘脑及胃组织的CRH蛋白含量都正相关;脑梗塞相关的肠屏障破坏和肠道局部组织的CRH蛋白含量正相关而和下丘脑的CRH蛋白含量不相关。
Objective:To investigate the role of CRH in the gastrolintestinal barrier changes in cerebral infarction and explore it's possible underneath mechanism.
     Methods:60 male Wistar rats were randomly divided into 6 groups with 10 each:Blank group(group B),sham operation group(group C),infarction group(group I),infarction+α-h-CRH(9-41) ic group(group Aic),infarction+α-h-CRH(9-41) ip group(group Aip),infarction+CRH ip group(group H).Blood samples were taken 24h after operation.The plasma activity of diamine oxidase(DAO) concentration of plasma D-lactate and plasma Lipopolysaccharide(LPS) were measured.24h urine were collected to detect urinary cortisol, urinary catecholamines(norepinephrine and epinephrine) and sucrose excretion.Gastric gross ulcer score and histological score of the gastrolintestinal were also determined. Immunohistochemistry was used to analysis the changes of CRH protein localizing in the gastrointestinal tract.WesternBlot and Realtime-PCR technology were used to detect the CRH protein and CRHmRNA in the hypothalamus and gastrointestinal tract.
     Results:Cerebral infarction was confirmed by NSS in all groups of rat in group I,group Aic, group H and group Aip.The results of the tendency of 24h urinary cortisol,urinary norepinephrine,urinary epinephrine were concurrent:group I≈group H≈group Aip>group Aicgroup C≈group B。The results of the tendency of sucrose excretion,gastric gross ulcer score,gastric histological score and hypothalamus CRH protein/mRNA were concurrent: group I≈group Aip>group Aicgroup H≥group C≈group B.The results of the tendency of plasma activity of DAO,plasma D-lactate,plasma LPS,the gut histological score and gut CRH protein/mRNA content were concurrent:group I>group Aip≥group Aic≈group H≥group C≈group B.There were positive correlations between sucrose excretion,gastric gross ulcer score,24h urinary cortisol,urinary norepinephrine,urinary epinephrine and hypothalamus CRH protein;between the level of plasma D-lac,plasma activity of DAO, plasma LPS and gut CRH protein.
     Conclusions:(l)The gastrointestinal tract barrier dysfunction will show up with the activation of HPA axis,SNS and the elvation of CRH protein in the hypothalamus and gastrointestinal tract after cerebral infarction.(2) The infarction related gastrointestinal barrier dysfunction is occure probably not because of cortisol or catecholamine.(3)CRH is closely related to the infarction related gastrointestinal barrier dysfunction.We may suppress this kind of stress related gastrointestinal barrier dysfunction through interfere the activity of CRH in the hypothalamus or the gastrointestinal tissue.(4) Central use of CRH antagonistα-h-CRH(9-41) will suppress the infarction related gastrointestinal barrier dysfunction to a certain degree.(5)Peripheral use of CRH antagonist a-h-CRH(9-41) will suppress the infarction related intestinal but not gastric barrier dysfunction to a certain degree(6) Peripheral use of CRH can suppress the concentration of CRH protein/CRHmRNA in the gastrointestinal tract and hypothalamus.(7)Infarction related gastric barrier dysfunction is correlated with CRH protein in the hypothalamus and stomach,Infarction related intestinal barrier dysfunction is correlated with CRH protein in the intestinal tract but not in the hypothalamus.
引文
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