内脏脂肪NOD样受体蛋白3炎性体通路在限食后追赶生长大鼠胰岛素抵抗形成中的作用  被引量:3

The effect of NALP3 inflammasome pathway in visceral adipose tissue on the development of insulin resistance in catch-up growth after food restriction in rats

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作  者:李燕[1,2] 陈璐璐[1] 胡祥[1] 余珊[1] 郑涓[1] 黎慧清[1] 曾天舒[1] 夏文芳[1] 张皎月[1] 

机构地区:[1]华中科技大学同济医学院附属协和医院内分泌科,武汉430022 [2]山西省长治医学院附属和平医院内分泌科,046000

出  处:《中华内科杂志》2014年第6期482-486,共5页Chinese Journal of Internal Medicine

基  金:国家自然科学基金(81170782)

摘  要:目的 观察追赶生长(CUG)对内脏脂肪NOD样受体蛋白3(NALP3)炎性体通路的影响,探讨追赶生长大鼠胰岛素抵抗的形成机制.方法 SD大鼠分为普通饮食组(NC)和追赶生长组(CUG),实验4、6、8周检测腹部脂肪含量(AFM%)、高胰岛素-正糖钳夹试验中葡萄糖输注率(GIR60-120)以及肾周脂肪NALP3炎性体、效应分子半胱天冬酶-1(caspase1)和IL-1β表达.结果 限食4周末,与NC组比较,CUG组AFM%明显下降[(11.54±1.81)%比(7.72±1.47)%,P<0.05],肾周脂肪NALP3炎性体(0.47±0.03比0.28 ±0.04,P<0.01)、caspase1(p10)(0.30±0.02比0.20 ±0.03,P<0.01)和IL-1β (p17)(0.52 ±0.04比0.37 ±0.04,P<0.05)表达也显著降低,而GIR60-120略升高[(23.47±0.89) mg·min^-1·kg^-1比(25.34±1.16) mg·min^-1·kg^-1,P>0.05].恢复饮食后,CUG组AFM%、NALP3炎性体、caspase1(p10)和IL-1β (p17)表达逐渐增加,GIR60-120相应下降;至恢复饮食4周时,CUG组AFM%、NALP3炎性体、caspase1 (p10)和IL-13(p17)表达显著高于NC组[分别是(15.16±1.10)%比(12.52 ±0.64)%,P<0.01;0.65 ±0.05比0.52 ±0.02,P<0.05;0.54±0.02比0.33±0.03,P<0.01;0.65 ±0.05比0.55 ±0.04,P<0.05],而GIR60-120明显低于NC组[(14.27±1.06) mg· min^-1·kg^-1比(21.45±1.20) mg·min^-1·kg^-1,P<0.05].相关分析显示,肾周脂肪NALP3和caspase1 (p10)表达与AFM%正相关(r=0.946,r=0.922,P值均<0.01),与GIR60-120负相关(r=-0.902,r=-0.944,P值均<0.01).结论 CUG能显著激活内脏脂肪NALP3炎性体通路,这可能是CUG胰岛素抵抗形成的重要机制.Objective To investigate the effects of catch-up growth(CUG) on the natch domain,leucine-rich repeat and PVD-containing protein 3 (NALP3) inflammasome pathway in visceral adipose tissue (VAT) and the mechanism of insulin resistance (IR) in CUG.Methods Sprague-Dawley rats were randomly divided into the normal chow (NC) and the catch-up growth group (CUG).General characteristics,glucose infusion rate60-120 (GIR60-120) in hyperinsulinemic-euglycemic clamp and expression of NALP3 inflammasome,caspase1 (p10)and IL-1β (p17) cleavage in VAT were respectively examined on week 4,6 and 8 of the experiment.Results After 4-week food restriction,lower percentage of abdominal fat mass (AFM%) was presented in the CUG group than the NC group [(11.54 ± 1.81)% vs (7.72 ±1.47) %,P 〈 0.05].In the CUG group,decreased expression of NALP3 inflammasome,caspase1 (p10)and IL-1 5 (p17) cleavage in VAT were found (0.47 ± 0.03 vs 0.28 ± 0.04,P 〈 0.01 ; 0.30 ± 0.02 vs 0.20 ± 0.03,P 〈 0.01 ; 0.52 ± 0.04 vs 0.37 ± 0.04,P 〈 0.05 ; respectively),whereas GIR60-120 was slightly improved [(23.47 ±0.89)mg · min^-1 · kg^-1 vs (25.34 ± 1.16) mg · min^-1 · kg^-1,P〉0.05].After refeeding,AFM% and the expression of NALP3 inflammasome,caspase1 (p10) and IL-1β (p17)cleavage in VAT in CUG group were shown to be increased with the time.Concomitant with those changes,GIR60-120 was gradually impaired.On week 4 of refeeding,AFM% and the expression of NALP3 inflammasome,caspase1 (p10)and IL-1β(p17) cleavage in VAT were significantly increased in the CUGgroup compared with the NC group [(12.52 ±0.64)% vs (15.16 ± 1.10)%,P 〈0.01 ; 0.52 ±0.02 vs 0.65±0.05,P〈0.05;0.33±0.03 vs0.54±0.02,P〈0.01; 0.55±0.04 vs0.65±0.05,P〈0.05;respectively],while GIR60-120 was significantly attenuated [(21.45 ± 1.20)mg· min^-1 · kg^-1 vs (14.27 ± 1.06) mg · min^-1 · kg^-1,P 〈 0.05].Correlation analysis showed that the expression of NALP3 and

关 键 词:胰岛素抗药性 追赶生长 NALP3炎性体 

分 类 号:R587.1[医药卫生—内分泌]

 

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