目的 观察催产素对3T3-L1脂肪细胞糖脂代谢的影响.方法 3T3-L1前脂肪细胞体外培养,并诱导其分化成熟为脂肪细胞.研究催产素对脂肪细胞葡萄糖消耗量以及三酰甘油、游离脂肪酸和甘油的影响.采用实时荧光定量PCR法检测糖脂代谢相关基因GLUT-1、GLUT-4、ATGT、HSL的mRNA表达.结果 与对照组比较,催产素20、50、100 μg/mL组葡萄糖消耗量有所增加,且表现出剂量相关.催产素组较对照组的三酰甘油降低,而甘油和游离脂肪酸增高.催产素50 μg/mL组中脂代谢相关基因HSL表达明显高于对照组,糖代谢相关基因GLUT-4 mRNA表达水平增加.结论 催产素处理可减少3T3-L1细胞脂质合成、增加脂质分解作用,并可明显改善脂质积聚.
Objective To study the effect of oxytocin on glucose and lipid metabolism in 3T3-L1 adipocytes. Methods Preadipocytes from 3T3-L1 cell line were cultured in vitro and induced to differentiate to adipocytes. Mature adipocytes were treated with oxytocin. Glucose consumption, triglyceride, free fat acid, and glycerol levels were determined. The mRNA expression of differentiation marker genes such as GLUT-1, GLUT-4, ATGT, and HSL were evaluated by RT-PCR method. Results The glucose consumption in the oxytocin (20, 50, and 100 μg/mL) groups were increased with dose-dependent relationship compared with control group. Triglyceride in the oxytocin group was lower than that in control group, while glycerol and free fatty acid decreased. There was significant increase of expression levels of lipid metabolism related gene HSL and sugar metabolism related gene GLUT-4 mRNA in the oxytocin (50 μg/mL) group compared with control group. Conclusion Treatment of oxytocin may reduce 3T3-L1 cell lipid synthesis, increase lipid decomposition, and obviously improve lipid accumulation.