山东大学学报 (医学版) ›› 2023, Vol. 61 ›› Issue (11): 38-47.doi: 10.6040/j.issn.1671-7554.0.2023.0753
• • 上一篇
芦兴晨1,强晔2,刘昕宇3,左丹4,姜子晗1,张玉超4,刘元涛5,马小莉2
LU Xingchen1, QIANG Ye2, LIU Xinyu3, ZUO Dan4, JIANG Zihan1, ZHANG Yuchao4, LIU Yuantao5, MA Xiaoli2
摘要: 目的 探讨NR4A1对毒胡萝卜素(TG)诱导小鼠C2C12肌管细胞糖代谢功能障碍的影响及机制。 方法 体外诱导C2C12细胞分化为成熟肌管细胞,将加入20 nmol/L胰岛素刺激10 min的细胞标记为胰岛素组,未做特殊处理的细胞标记为对照组,采用Western blotting法检测磷酯酰肌醇-3-激酶/蛋白激酶B(PI3K/AKT)信号通路、NR4A1蛋白水平。采用CCK8法检测TG浓度梯度处理的C2C12肌管细胞活力,建立糖代谢损伤细胞模型。将C2C12肌管细胞分为对照组、无水乙醇(EtOH)组、TG组,分别处理后加入胰岛素刺激,采用葡萄糖试剂盒检测葡萄糖消耗水平,采用Western blotting法检测NR4A1、p-PI3K、p-AKT蛋白表达。采用慢病毒感染并筛选,获得对照与稳定过表达NR4A1的C2C12肌管细胞,并进行TG处理,分为Ad-NC组、Ad-NC+EtOH组、Ad-NC+TG组和Ad-NR4A1+TG组。分化成熟后加入胰岛素刺激,检测葡萄糖消耗水平,检测NR4A1、p-PI3K、p-AKT的表达。 结果 与对照组相比,胰岛素组C2C12肌管细胞PI3K/AKT通路磷酸化水平及NR4A1表达水平显著升高(P<0.01)。CCK-8结果显示,TG浓度大于1 μmol/L时,细胞活力显著下降(P<0.01)。与EtOH组相比,TG组葡萄糖消耗减少,NR4A1表达水平下降,PI3K/AKT蛋白磷酸化水平受到抑制(P均< 0.01)。胰岛素刺激C2C12肌管细胞,与Ad-NC+TG组相比,Ad-NR4A1+TG组葡萄糖消耗增加(P<0.05)、PI3K/AKT信号通路显著活化(P<0.05)。 结论 TG导致C2C12肌管细胞糖代谢功能障碍。NR4A1对TG诱导的C2C12肌管细胞糖代谢障碍具有改善作用,其机制可能通过PI3K/AKT信号途径发挥作用。
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