吡哆胺对糖尿病大鼠视网膜晚期糖基化终末产物及其受体基因表达的影响

来源 :2014年中国眼底病论坛暨全国眼底病专题学术研讨会 | 被引量 : 0次 | 上传用户:dsfsdfdfdsf
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目的 研究吡哆胺对糖尿病大鼠视网膜晚期糖基化终末产物(AGEs)及其受体(RAGE) 基因表达的影响,探讨吡哆胺对糖尿病大鼠视网膜的保护作用.方法 SD大鼠随机分为正常对照组和模型组,正常对照组(NC组):正常大鼠柠檬酸缓冲液腹腔注射72小时后蒸馏水灌胃.模型组腹腔注射链脲佐菌素(STZ)诱发糖尿病,再分为3组:吡哆胺治疗组(PM组);氨基胍治疗组(AG组);糖尿病对照组(DM组).分别于治疗4周和12周时取材,用ELISA法测定大鼠血清和视网膜AGEs含量,用免疫荧光染色和实时荧光定量PCR观察视网膜中RAGE蛋白和mRNA的分布和表达情况.结果 治疗4周和12周时,PM组与AG组及DM组比较,血清和视网膜AGEs含量差异具有统计学意义(P<0.01).12周时各组AGEs含量比4周时明显增加(P<0.01).免疫荧光染色检测发现RAGE表达于视网膜色素上皮层至神经节细胞层,治疗4周和12周时PM组与AG组及DM组OD值差异具有统计学意义(P<0.05).12周时各组RAGE表达明显高于4周时(P<0.01).RAGE mRNA的检测结果趋势与免疫荧光染色检测的蛋白分布结果一致.结论 吡哆胺治疗无明显降血糖作用,但能抑制糖尿病大鼠视网膜AGEs的产生,并下调其受体RAGE的表达,减轻其对视网膜的毒性损害,从而起到保护视网膜的作用.
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