机构地区:[1]中山大学孙逸仙纪念医院内分泌科,广州510120
出 处:《中华内分泌代谢杂志》2012年第4期276-281,共6页Chinese Journal of Endocrinology and Metabolism
摘 要:目的研究不同糖耐量人群的血脂多糖水平及其与胰岛素抵抗、β细胞分泌功能的关系。方法纳入新诊断的2型糖尿病患者(T2DM组)23例、糖耐量受损者(IGT组)21例和糖耐量正常者(NGT组)23名。血清脂多糖水平采用鲎变形细胞溶解物试验法测定,脂多糖toll样受体4(TLR4)在血浆单核细胞表面的表达采用流式细胞学方法测定,并测定一次高脂饮食后脂多糖在餐后0.5h及2h的变化。胰岛素抵抗指标采用稳态模型评估的胰岛素抵抗指数(HOMA-IR)来评估;β细胞分泌功能采用稳态模型评估的胰岛素B细胞功能指数(HOMA—β)/HOMA-IR、早期30min内胰岛素变化与血糖变化的比值(Alns30/AG30)/HOMA—IR、120min内胰岛素曲线下面积(AUClos 120min)/HOMA—IR评估。结果各组在高脂饮食后的2h脂多糖均较空腹脂多糖显著升高[NGT:0.96(0.33,0.99)对0.62(0.22,0.64),IGT:1.08(0.53,1.22)对0.71(0.39,0.82),T2DM:1.23(0.62,1.43)对0.86(0.45,0.94),EU/ml,均P〈0.01]。T2DM组及IGT组的空腹脂多糖、0.5h脂多糖、2h脂多糖和空腹TLR4均高于NGT组[空服脂多糖:0.86(0.45,0.94),0.71(0.39,0.82)对0.62(0.22,0.64),EU/ml;0.5h脂多糖:1.10(0.55,1.18),0.84(0.50,1.07)对0.73(0.31,0.76),EU/ml;2h脂多糖:1.23(0.62,1.43),1.08(0.53,1.22)对0.96(0.33,0.99),EU/ml;空腹TLR4:36.96(17.22,55.19),30.34(15.00,45.18)对15.66(6.09,9.76),MIF/105细胞,均P〈0.01]。相关分析显示,所有受试者的空腹脂多糖、120min内脂多糖曲线下面积(AUCLPS 120min)、空腹TLR4与胰岛素抵抗指标正相关(P〈0.05),与β细胞分泌功能指标负相关(P〈O.05)。多重线性回归分析显示,空腹脂多糖是HOMA-IR的独立�Objective To investigate serum lipopolysaccharide (LPS) level in people with different glucose tolerances and to explore the relationship between LPS and insulin resistance/β-cell secretory function. Methods Sixty-seven subjects were recruited, including 23 with newly diagnosed type 2 diabetes ( T2DM ), 21 impaired glucose tolerance ( IGT), and 23 normal glucose tolerance (NGT). Serum LPS was assayed by limulus amebocyte lysate test; expression of LPS toll-like receptor 4 ( TLR4 ) on surface of plasma monocytes was measured by flow cytometric assays, and the changes of LPS levels by 0.5 hours and 2 hours after a high-fat diet were detected. Insulin resistance was evaluated by homeostasis model assessment for insulin resistance (HOMA-IR); β-cell secretory function was evaluated by homeostasis model assessment for [3 cell function ( HOMA-β )/HOMA-IR, increment in insulin in the first 30 minutes/increment in glucose in the first 30 minutes (AIns30/AG30)/HOMA-IR, AUClos 120min/HOMA- IR. Results 2 h LPS levels after a high-fat diet were significantly higher than fasting LPS levels [ NGT :0.96 ( 0.33, 0.99)vs0.62(0.22,0.64) ,IGT:I. 08(0.53,1.22)vs 0.71(0.39,0.82) ,T2DM:1. 23(0.62,1.43)vs 0.86 (0.45,0.94), EU/ml, all P〈0.01 ]. Fasting, 0.5 h, and 2 h LPS levels and fasting TLR4 levels of T2DM group and IGT group were respectively higher than those of NGT group [ fasting LPS :0.86 ( 0.45,0.94 ), 0.71 ( 0.39,0.82 ) vs 0.62(0.22,0.64) ,EU/ml;0.5 h LPS: 1.10(0.55,1.18) ,0.84(0.50,1.07) vs 0.73(0.31,0.76), EU/ml;2 h LPS: 1.23(0.62,1.43) ,1.08(0.53,1.22)vs 0.96(0.33,0.99), EU/ml ; fasting TLR4 : 36.96( 17.22,55.19 ),30.34( 15.00,45.18)vs 15.66(6.09,9.76) ,MIF/10%ells, all P〈O. O1 ]. Fasting LPS, AUCLPs]20min, and fasting TLR4 were positively correlated with insulin resistance index and negatively correlated with β-cell secretory function index ( P〈O. 05 ). Multiple linear regression analysis show
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