非肥胖2型糖尿病大鼠腹腔脂肪组织基因差异表达的鉴定

Identification of difference of gene expression in the visceral adipose tissue of the lean type 2 diabetic rats

目的 研究非肥胖2型糖尿大鼠腹腔脂肪组织基因差异表达。方法 基因差异表达筛查使用代表性差异分析(cDNA RDA)技术;最终的差异产物经亚克隆、测序及生物信息学分析;半定量RT-PCR对筛查到的已知基因表达量进行初步的鉴定。结果 在大鼠脂肪组织中,发现7个高表达的表达序列标签(ESTs),6个为新的ESTs,1个为已知基因[脂蛋白脂酶(LPL)基因],其中1个EST与小鼠肌肉ERA-like GTPase(Era)基因部分相似(相似性约15％)。LPL基因在非肥胖2型糖尿病及高脂饮食组大鼠腹腔脂肪组织表达上调。结论 在大鼠腹腔脂肪组织中发现6个新的ESTs和1个已知基因高表达,其中1个EST与小鼠肌肉ERA-like GTPase(Era)基因部分相似。LPL基因表达上调可能与高脂饮食、高血脂、胰岛素抵抗及非肥胖2型糖尿大鼠分子发病机制相关。

Objective To investigate the difference of gene expression in the visceral adipose tissue of the lean type 2 diabetic rats. Methods The difference bands were generated by the representational difference analysis ( cDNA RDA) ; the final difference products was ligated into the pUC-18 vector, subcloned and sequenced, and the obtained expressed sequence tags ( ESTs) were given bioinformatics analysis, and then the expression level of known gene was verified by semi-quantitative RT-PCR preliminarily. Results Six novel ESTs and 1 known gene [ rat lipoprotein lipase ( LPL) gene) were obtained in visceral adipose tissue of rat. One of the ESTs was partially similar to mouse musculus ERA-like GTPase (Era) gene. LPL gene was up-regulated in the visceral adipose tissue of the lean type 2 diabetic rats and those fed with fat-enriched food. Conclusion Six novel ESTs and 1 known gene in high expression are obtained from visceral adipose tissue of rat. LPL gene among them is up-regulated and may be related to the high fat and high calorie diet, hyperlipidemia, insulin resistance and molecular pathogenesis of the lean type 2 diabetic rat.