摘要:
Objective To investigate the dynamic changes in intestinal alpha-defensin-5 (RD-5),beta-defensin-2 (BD-2) mRNA after acute liver failure(ALF),and to explore their role in ALF.Methods A total of 60 C57BL5 mice were divided into 4 groups by means of random number table method:normal control group,ALF group,E.coli via gavage group and ALF + E.coli via gavage group.Intraperitoneal injection of D-galactosamine (500 mg/kg) and lipopolysaccharide(10 μg/kg) to make the model,in addition,ALF mice were fed with E.coli,and the observation time was 6 hours,12 hours,and 24 hours after modeling,and each time point had 6 specimens.Real-time PCR was used to test the RD-5 mRNA and BD-2 mRNA levels in the ileum tissue.Results The levels of RD-5 and BD-2 showed dynamic change in the experiment of ALF.Compared with the levels of RD-5 and BD-2(11.25 ±0.74,23.86 ±0.39) of the normal control group,the levels of RD-5 and BD-2 in ALF group and E.coli via gavage group increased at 6 hours after modeling(14.19 ±0.39,26.79 ± 0.36 and 12.57 ± 0.68,26.45 ± 0.85),and the differences were significant(all P<0.05);at 12 hours after modeling,the RD-5 and BD-2 reached to the maximum concentration(15.76 ±0.33,29.10 ± 0.61 and 12.90 ± 0.96,27.42 ± 0.71),and the differences were statistically signi-ficant (all P < 0.05).The degree of elevation of BD-2 was higher than RD-5.Later,they gradually declined.Conclusions RD-5 and BD-2 may play an important role in the pathogenesis of intestinal endotoxemia in experimental ALF.%目的 观察肠道α-防御素-5(RD-5)、β-防御素-2(BD-2) mRNA在急性肝衰竭(ALF)小鼠造模后不同时间的动态表达,探讨其在ALF发病机制中的作用.方法 将60只C57 BL6小鼠按随机数字表法分为4组:正常对照组、ALF造模组、大肠埃希菌(Ecoli)灌胃组和ALF+E.coli灌胃组.采用氨基半乳糖500 mg/kg+脂多糖10 μg/kg腹腔注射造模,另对ALF小鼠予E.coli灌胃,观察时间点为造模后6h、12 h、24 h,每个时间点6个标本.采用实时荧光定量PCR方法 检测小鼠回肠末端组织RD-5、BD-2 mRNA的表达.结果 RD-5,BD-2水平在实验性ALF中呈动态变化,与正常对照组(11.25 ±0.74、23.86±0.39)相比,ALF造模组与ALF+E.coli灌胃组在造模后6h显著升高(分别为14.19±0.39、26.79±0.36,12.57 ±0.68、26.45±0.85),差异均有统计学意义(均P<0.05);12 h达高峰(分别为15.76±0.33、29.10±0.61,12.90±0.96、27.42±0.71),差异均有统计学意义(均P<0.05);后逐渐下降;BD-2水平较RD-5水平升高更明显.结论 RD-5、BD-2可能在实验性小鼠ALF肠源性内毒素血症发病机制中起一定作用.