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重组瘦素治疗对链脲佐菌素糖尿病大鼠胃促生长素水平的影响

董明,侯新国,陈丽,孙磊,付艺玲,唐宽晓   

  1. 山东大学齐鲁医院内分泌科, 山东 济南 250012
  • 收稿日期:2007-02-10 修回日期:1900-01-01 出版日期:2007-05-24 发布日期:2007-05-24
  • 通讯作者: 陈丽

Effect of recombinant leptin on ghrelin expression of STZ-induced diabetic rats

DONG Ming, HOU Xin-guo, CHEN Li, SUN Lei, FU Yi-ling, TANG Kuan-xiao   

  1. Department of Endocrinology, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China
  • Received:2007-02-10 Revised:1900-01-01 Online:2007-05-24 Published:2007-05-24
  • Contact: CHEN Li

摘要: 目的:探讨重组瘦素治疗对链脲佐菌素(STZ)糖尿病大鼠血浆胃促生长素水平及胃壁组织mRNA表达水平的影响。方法:SPF级近交系雄性健康Wistar大鼠分为正常对照组(NC, n=8)、糖尿病组(DM, n=6)、糖尿病瘦素治疗组(DM-LEP, n=6)和糖尿病瘦素治疗饮食配对组(DM-PF, n=6)。瘦素按4mg/kg皮下注射。观察治疗前后各组大鼠进食量、体重及血糖、胰岛素、瘦素、胃促生长素水平以及瘦素在脂肪组织和胃促生长素在胃壁组织的mRNA表达水平。结果:瘦素治疗后,DM-LEP组大鼠摄食量显著低于DM组(P<0.05),血糖水平显著低于DM组和DM-PF组(P均<0.05),但与NC组比较,仍有显著差异(P<0.01);DM-LEP组和DM组及DM-PF组相比,血清瘦素水平及其脂肪组织表达水平均显著升高(P均<0.05),但仍低于NC组(P<0.05);DM-LEP组血浆胃促生长素及其胃壁组织mRNA表达水平显著低于DM组和DM-PF组(P均<0.05),但仍高于NC组(P<0.05)。结论:瘦素可降低STZ大鼠血浆胃促生长素及其胃壁组织mRNA的表达水平,且此作用与其抑制摄食作用无关。

关键词: 瘦素 , 链脲佐菌素, 胃促生长素, 糖尿病

Abstract: Objective: To investigate the effect of recombinant leptin on plasma ghrelin levels and the expression of ghrelin mRNA in the stomach of streptozotocin(STZ)-induced diabetic rats. Methods: Wistar rats were divided into four groups: the control group, the diabetes group(the DM group), the DM leptin group(the DM-LEP group) and the DM-LEP pair-fed group(the DMPF group). DM-LEP rats were subjected to leptin at a dosage of 4?mg/kg sc daily for 7 days. The body weight, blood glucose, insulin, leptin and ghrelin were determined. Furthermore, leptin mRNA expression in the adipose tissues and ghrelin mRNA expression in the stomach were determined. Results: Food intake in the DM-LEP group significantly decreased compared with the DM group (P<0.05). The plasma glucose significantly decreased in the DMLEP group compared with the DM and the DM-PF groups (P<0.05). The serum leptin and leptin mRNA expressions in adipose tissues were lower in the DM-LEP group than those in the DM group(P<0.05), but were significantly higher than those in the control group. The plasma ghrelin and ghrelin mRNA expressions in the stomach were also markedly decreased in the DM-LEP group compared with the DM group. Conclusion: Leptin can reverse elevated plasma ghrelin levels and ghrelin mRNA expression in the stomach independent of the fasting insulin concentration and food intake.

Key words: Diabetes mellitus, Streptozotocin, Leptin, Ghrelin

中图分类号: 

  • R587.1
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