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慢性宫内缺氧对子代兔非酒精性脂肪性肝病的影响及黄芪的保护作用
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摘要
目的:
     研究慢性宫内缺氧对子代兔非酒精性脂肪性肝病的影响,并初步探讨黄芪的保护作用。
     方法:
     将新西兰孕兔24只于孕第10天随机分为3组,即慢性宫内缺氧组(12%O_2)、中药黄芪组(12%O_2)、正常对照组(21%O_),每组各8只。待孕兔生下子代兔后,每窝中随机取1只雄性仔兔,共24只仔兔,分组同上,母乳喂养至3月龄后,再给予普通饲料喂养至6月龄。第6个月龄末,处死动物,留取标本,测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)浓度,肿瘤坏死因子-α(TNF-α)浓度,行肝组织HE染色及TNF-α多克隆抗体免疫组化染色,观察肝组织形态学表现及TNF-α表达情况。
     结果:
     1.与正常对照组相比,慢性宫内缺氧组血清TG、TC、LDL-C、TNF-α浓度增高,血清HD降低,统计学上有显著性差异(P<0.01);与正常对照组相比,中药黄芪组血清TG、LDL-C增高,血清HDL-C降低,统计学上有显著性差异(P<0.01);与慢性宫内缺氧组比较,中药黄芪组血清TG、TC、LDL-C、TNF-α浓度降低,血清HDL-C增高,统计学上有显著性差异(P<0.01);与正常对照组相比,中药黄芪组血清TC、TNF-α浓度增高,但无显著性差异(P>0.05)。与正常对照组相比,中药黄芪组、慢性宫内缺氧组血清AST、ALT浓度依次增高,但三组之间两两比较,统计学上均无显著性差异(P>0.05)。
     2.正常对照组、中药黄芪组、慢性宫内缺氧组三组之间相比,肝组织HE染色、TNF-α表达光镜下表现明显不同;肝组织脂肪变性程度比较,慢性宫内缺氧组较严重,正常对照组无明显脂肪变性,中药黄芪组脂肪变性程度介于两组之间,三组之间两两比较,统计学上有显著性差异(P<0.01)。
     结论:
     1.本实验成功制备了子代兔慢性宫内缺氧模型。
     2.慢性宫内缺氧可引起子代兔主要器官宫内不适当比例生长及低出生体重。
     3.慢性宫内缺氧与子代兔成年NAFLD的发生密切相关,可增加成年期NAFLD发生的易感性,可能是成年期NAFLD发生的一个重要影响因素。
     4.黄芪可减轻慢性宫内缺氧引起成年兔NAFLD发生的损伤,对慢性宫内缺氧引起的成年兔NAFLD发生的损伤有一定的防护作用。
Objective
     To investigate the effect of chronic intrauterine hypoxia on nonalcoholic fatty liver disease in adult rabbit offspring and the protective function of Astragalus.
     Methods
     Twenty-four New-Zealand rabbits were randomly divided into 3 groups on gestation day 10: chronic intrauterine hypoxia group(CIH,12%O_2,n=8),Astragalus group(CIH&A,12%O_2, n=8) and normal control(NC,21%O_2,n=8).After delivery,one male offspring of each mother rabbit was selected and breast-fed for three months.Then they were fed on normal diet from the fourth month to the sixth month.At the end of the sixth month,serum alanine transaminase (ALT)、aspartate transaminase(AST)、triglyceride(TG)、cholesterol(TC)、low density lipoprotein-cholesterol(LDL-C),high density lipoprotein- cholesterol(HDL-C),tumor necrosis-α(TNF-α) were measured.The rabbits' fatty livers were stained with hematoxylin-eosin and immunohistochemistry and image the expression of TNF-αin the liver.
     Results
     1.Compared with the normal group,the level of serum TG、TC、LDL-C、TNF-αin chronic intrauterine hypoxia group were significantly increased,but the level of serum HDL-C was decreased.There was much significant difference between the two groups(P<0.05).Compared with the normal group,the level of serum TG、LDL-C in Astragalus group were significantly increased,but the level of serum HDL-C was decreased.There was much significant difference between the two groups(P<0.05).Compared with chronic intrauterine hypoxia group,the level of serum TG、TC、LDL-C、TNF-αin Astragalus group were significantly decreased,but the level of serum HDL-C was increased.There was much significant difference between the two groups(P<0.05).Compared with the normal group,the level of serum TC and TNF-αwas increased,but there was no significant difference between the two groups(P>0.05).Compared with the normal group,the level of serum AST、ALT in chronic intrauterine hypoxia group and Astragalus group were significantly increased,but there was no significant difference between the three groups(P>0.05).
     2.There were significantly different in hepatic tissue HE stain and TNF-αexpression among CIH,CIH & A and NC groups.According to the degree of hepatic tissue fatty degeneration,CIH group is the highest,and NC group is the lowest.However there were significantly different in the degree of hepatic tissue fatty degeneration among the three groups(P>0.05).
     Conclusion
     1.This experiment has successfully produced the model of chronic intrauterine hypoxia.
     2.Chronic intrauterine hypoxia can lead to intrauterine growth retardation(IUGR)and lower body birth-weight.
     3.Chronic intrauterine hypoxia is an important influence factor resulting in nonalcoholic fatty liver disease in adult rabbit offspring.Chronic intrauterine hypoxia may increase the risk of nonalcoholic fatty liver in adult rabbit offspring.
     4.Astragalus can reduce the damage of nonalcoholic fatty liver disease in adult rabbit offspring which is caused by chronic intrauterine hypoxia and protect rabbit offspring from chronic intrauterine hypoxia.
引文
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