摘要目的:基于胰岛素抵抗时磷酸化叉头框蛋白O1（pFoxO1）介导的肌肉环指蛋白（MuRF）骨骼肌蛋白降解途径，探讨胰岛素抵抗时骨骼肌蛋白含量变化及健脾清化方的作用。方法:采用高脂饲料喂养c57小鼠制备肥胖伴胰岛素抵抗模型。将成模小鼠按随机数字表法分为模型组、健脾清化方组、二甲双胍组，每组10只。健脾清化方组灌胃健脾清化方水煎液20.961 g生药/kg，二甲双胍组灌胃二甲双胍混悬液18.498 g/kg，模型组灌胃等体积的生理盐水，1次/d，连续给药4周。分别于造模后及给药后进行腹腔葡萄糖耐量试验（IPGTT），采用Western blot法检测pFoxO1、FoxO1、MuRF、肌生成促进因子1（MyoD）、肌球蛋白（myosin）相对表达，采用免疫组化染色法检测MyoD、myosin的定位和表达情况。结果:与模型组比较，健脾清化方组小鼠糖耐量试验中0、60、120 min血糖降低（ P<0.05）；健脾清化方组和二甲双胍组pFoxO1/FoxO1蛋白表达比值［（0.27±0.07）、（0.24±0.14）比（0.05±0.03）］升高（ P<0.05），MuRF蛋白相对表达［（1.22±0.42）、（1.15±0.32）比（3.21±0.35）］降低（ P<0.05），健脾清化方组MyoD［（1.42±0.45）比（0.4±0.11）］、myosin［（0.80±0.11）比（0.51±0.08）］蛋白相对表达升高（ P<0.05）；免疫组化染色显示，健脾清化方组MyoD［（5.06±1.72）比（2.28±0.83）］和myosin［（60.28±7.47）比（39.77±3.34）］表达升高（ P<0.05）。 结论:健脾清化方可有效提高肥胖伴胰岛素抵抗模型小鼠骨骼肌蛋白含量，其机制可能与促进骨骼肌FoxO1磷酸化，抑制骨骼肌蛋白MuRF降解途径有关。

abstractsObjective:Based on the degradation of skeletal muscle protein MuRF mediated by pFoxO1 when insulin resistance occurs, this paper explores the content change of skeletal muscle protein and the effect of Jianpi Qinghua formula when insulin resistance occurs.Methods:C57 mice were fed with high-fat food and made as the model of obesity accompanied by insulin resistance. Then they were divided into model group, Jianpi Qinghua formula group and metformin group according to random number table method with 10 mice in each group. Jianpi Qinghua formula group was orally administered with water decoction 20.961 g/kg, and the metformin group was orally administered with metformin suspension 18.498 g/kg, once a day for 12 consecutive weeks. Intraperitoneal Glucose Tolerance Tests (IPGTT) was used after the model was established and intervened respectively. The relative protein content of pFoxO1, FoxO1, MuRF, MyoD and myosin were detected by Western blot method, and the localization of MyoD and myosin was detected by immuno-histochemistry.Results:Compared with the model group, the blood glucose of IPGTT at 0 min, 60 min and 120 min of both Jianpi Qinghua formula group and Metformin group decreased ( P<0.05). Compared with model group, the ratio of pFoxO1/FoxO1 protein expression level (0.27±0.07, 0.24±0.14 vs. 0.05±0.03) of both Jianpi Qinghua formula group and Metformin group increased ( P<0.05), and the relative expression of MuRF protein (1.22±0.42, 1.15±0.32 vs. 3.21±0.35) of both Jianpi Qinghua formula group and Metformin group decreased ( P<0.05). The relative protein expression of MyoD (1.42±0.45 vs. 0.40±0.11) and myosin (0.80±0.11 vs. 0.51±0.08) relative protein expression of Jianpi Qinghua formula group was significantly higher than that of model group ( P<0.05). Immunohistochemical staining showed that MyoD (5.06±1.72 vs.2.28±0.83) and myosin (60.28±7.47 vs. 39.77±3.34) of Jianpi Qinghua formula group significantly increased compared with model group ( P<0.05). Conclusion:Jianpi Qinghua formula could effectively increase the content of skeletal muscle protein, enhancing the phosphorylation of FoxO1 in skeletal muscle and the inhibition of MuRF degradation pathway.