补体C1q/肿瘤坏死因子相关蛋白3对3T3-L1脂肪细胞脂肪因子表达的影响

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目的:观察脂肪因子补体C1q/肿瘤坏死因子(TNF)相关蛋白3(CTRP3)对3T3-L1脂肪细胞脂联素(APN)、瘦素(LPT)、内脏脂肪素(VFT)及爱帕琳肽(APL)等脂肪因子表达的调节效应,以及胰岛素抵抗对该调节效应的影响。方法以软脂酸诱导胰岛素抵抗的3 T3-L1脂肪细胞模型,分别以10、50、250μg/L CTRP3干预正常3T3-L1脂肪细胞12以及250μg/L CTRP3干预胰岛素抵抗的3T3-L1脂肪细胞12 h。分别通过酶联免疫吸附法( ELISA)及实时定量-聚合酶链反应( RT-PCR)法检测脂肪因子蛋白分泌量及基因表达水平。组间差异采用方差分析,两组间进一步比较采用SNK-q检验。结果250μg/L CTRP3干预正常组APN、LPT、VFT及APL蛋白分泌量较正常对照组分别增加了63.3%、42.9%、57.1%及56.0%( q=8.605、8.526、8.284、8.573,均 P<0.05);10及50μg/L干预组上述脂肪因子蛋白分泌量呈增加趋势,但除50μg/L CTRP3干预组APL蛋白分泌量较对照组显著增加外[(6.2±1.1)比(5.0±0.9)μg/L, q=4.593,P<0.05],其余均差异无统计学意义(均P>0.05);其基因表达变化趋势与此类似,并且在干预浓度为50μg/L时APN、LPT、VFT及APL mRNA表达水平较正常对照组分别增加22.0%、13.0%、20.0%及33.0%( q=6.150、3.987、5.653、9.031,均P<0.05)。与CTRP3(250μg/L)干预正常脂肪细胞相比,CTRP3(250μg/L)干预胰岛素抵抗脂肪细胞APN、LPT、VFT及APL蛋白分泌量分别降低了28.6%、21.0%、24.5%及17.9%( q=6.341、5.969、5.592、4.287,均 P <0.05),基因表达降低了21.6%、17.2%、15.6%及18.9%(q =9.225、7.668、7.066、8.210,均P<0.05)。结论 CTRP3浓度依赖性地增加3T3-L1脂肪细胞APN、LPT、VFT及APL的表达,胰岛素抵抗降低该调节效应。
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