双(α-呋喃甲酸)氧钒对胰岛素抵抗3T3-L1脂肪细胞糖摄取的影响

目的探讨新型的有机羧酸氧钒配合物双(α-呋喃甲酸)氧钒(BFOV)对正常及胰岛素抵抗的3T3-L1脂肪细胞糖摄取的影响。方法采用地塞米松诱导3T3-L1脂肪细胞建立胰岛素抵抗的细胞模型,研究双(α-呋喃甲酸)氧钒对正常及胰岛素抵抗3T3-L1脂肪细胞葡萄糖消耗的影响。结果双(α-呋喃甲酸)氧钒(2.5μmol·L-1~40μmol·L-1)对正常的3T3-L1脂肪细胞仅有增加葡萄糖消耗量的趋势,与空白对照组比较,差异无显著性;但能明显增加地塞米松诱导的胰岛素抵抗3T3-L1脂肪细胞的葡萄糖消耗量,改善模型细胞的胰岛素抵抗状态。结论双(α-呋喃甲酸)氧钒能促进胰岛素抵抗脂肪细胞的葡萄糖摄取,改善胰岛素抵抗状态。     

荭草素抑制3T3-L1前脂肪细胞分化及其改善胰岛素抵抗的作用研究

目的研究荭草素对3T3-L1前脂肪细胞分化及对脂肪细胞胰岛素抵抗的影响,并探讨其作用机制。方法传统鸡尾酒法诱导分化3T3-L1前脂肪细胞,MTT法检测荭草素对前脂肪细胞活力的影响,油红O染色法检测脂质积累,酶法检测细胞内甘油三酯(triglyceride,TG)的含量。地塞米松诱导成熟的脂肪细胞,建立胰岛素抵抗模型,荧光标记2-脱氧葡萄糖(2-[N-(7-nitrobenz-2-oxa-1,3-diaxol-4-yl)amino]-2-deoxyglucose,2-NBDG)摄入法观察脂肪细胞对葡萄糖的摄取能力;Western blot检测腺苷酸活化蛋白激酶(adenosine monophosphate activated protein kinase,AMPK)、乙酰辅酶A羧化酶(acetyl Co A carboxylase,ACC)的磷酸化水平及葡萄糖转运体4(glucose transporter type 4,GLUT4)的表达水平,免疫荧光法检测GLUT4的向膜转位能力。结果荭草素可浓度依赖性地减少细胞脂滴的积累及细胞内TG的含量,但对细胞活力无明显的影响(P>0.05)。胰岛素抵抗状态下,荭草素明显增加脂肪细胞对2-NBDG的摄取(P<0.05),明显上调AMPK、ACC的磷酸化水平(P<0.05),促进GLUT4的向膜转位及表达。结论荭草素抑制前脂肪细胞的分化,同时,荭草素通过上调AMPK/GLUT4信号途径相关蛋白的表达,促进了细胞对葡萄糖的摄取,达到改善胰岛素抵抗的作用。     

体外胰岛素抵抗细胞模型的建立及在药物筛选中的应用

目的在体外建立肝胰岛素抵抗细胞模型和脂肪细胞胰岛素抵抗模型,并初步应用于中药有效成分的胰岛素抵抗活性筛选中。方法采用高胰岛素诱发HepG2细胞建立肝胰岛素抵抗模型,地塞米松诱发3T3-L1脂肪细胞建立脂肪细胞胰岛素抵抗模型,研究不同药物对胰岛素抵抗模型细胞葡萄糖消耗的影响。结果将HepG2细胞置于10-6mol·L-1的胰岛素中36h,HepG2细胞对胰岛素的抵抗作用最为明显,该特性可维持48h,但未发现细胞形态学变化;地塞米松作用3T3-L1脂肪细胞后,96h空白组与模型组葡萄糖消耗量差值最大,此时为胰岛素抵抗的最高状态;脂肪细胞胰岛素抵抗模型成立后,撤掉地塞米松,胰岛素抵抗细胞模型能够在24h内稳定。某些中药提取成分(如水苏糖、小檗碱和人参皂苷等)能促进HepG2胰岛素抵抗模型和3T3-L1脂肪细胞胰岛素抵抗模型的葡萄糖消耗。结论高胰岛素诱导培养法可以复制出稳定可靠的肝胰岛素抵抗细胞模型;地塞米松诱导3T3-L1脂肪细胞也可建立稳定的脂肪细胞胰岛素抵抗模型。     

二氢杨梅素对胰岛素抵抗3T3-L1脂肪细胞的改善作用及其机制研究

目的研究二氢杨梅素(dihydromyricetin,DMY)对3T3-L1脂肪细胞胰岛素抵抗的改善作用及其机制。方法采用地塞米松诱导3T3-L1脂肪细胞形成胰岛素抵抗细胞,以1×10-6mol·L-1罗格列酮为阳性对照,DMY(1×10-5¹×10-8mol·L-1)与胰岛素抵抗3T3-L1脂肪细胞共培养72 h,用葡萄糖氧化酶法测定细胞培养基中的葡萄糖含量,计算葡萄糖消耗量;采用RT-PCR检测脂肪细胞的GLUT4、Akt 2和脂联素基因的表达量。DMY(1×10-51×10-8mol·L-1)与胰岛素抵抗3T3-L1脂肪细胞共培养72 h,用葡萄糖氧化酶法测定细胞培养基中的葡萄糖含量,计算葡萄糖消耗量;采用RT-PCR检测脂肪细胞的GLUT4、Akt 2和脂联素基因的表达量。DMY(1×10-5¹×10-8mol·L-1)加入正常3T3-L1脂肪细胞中培养48 h,检测细胞的葡萄糖消耗量。结果 DMY(5×10-71×10-8mol·L-1)加入正常3T3-L1脂肪细胞中培养48 h,检测细胞的葡萄糖消耗量。结果 DMY(5×10-7¹×10-8mol·L-1)明显增加地塞米松诱导胰岛素抵抗3T3-L1脂肪细胞的葡萄糖消耗量,并呈现一定的浓度依赖性,和罗格列酮相比,差异无统计学意义。1×10-51×10-8mol·L-1)明显增加地塞米松诱导胰岛素抵抗3T3-L1脂肪细胞的葡萄糖消耗量,并呈现一定的浓度依赖性,和罗格列酮相比,差异无统计学意义。1×10-5¹×10-8mol·L-1DMY处理正常3T3-L1脂肪细胞48 h后,葡萄糖消耗量与正常组相比差异无统计学意义。RT-PCR结果显示,DMY作用于胰岛素抵抗的脂肪细胞72 h后,脂肪细胞的GLUT4、Akt2和脂联素基因的表达量明显增加,与地塞米松模型组相比,差异有统计学意义。结论 DMY能改善3T3-L1脂肪细胞的胰岛素抵抗状态,其机制可能与其上调GLUT4、Akt2和脂联素基因的表达量有关。     

小鼠前脂肪细胞3T3-L1培养与四联诱导分化方法的探讨

摘要： 目的 改进小鼠前脂肪细胞 3T3-L1 的培养并诱导分化为成熟脂肪细胞的方法。方法 使用含有 10％胎牛血清 （FBS） 的高糖型 DMEM 液体培养基常规培养小鼠前脂肪细胞, 2~3 d 换液 1 次。细胞按诱导分化方式的不同分为三联诱导组和四联诱导组。三联诱导组诱导分化培养基Ⅰ成分为常规培养基基础上加用人胰岛素 10 mg/L, 1- 甲基-3-异丁基黄嘌呤 （IBMX）0.5 mmol/L, 地塞米松 （DEX） 1.0 μmol/L; 四联诱导组诱导分化培养基Ⅰ的成分为在三联诱导组基础上加入吲哚美辛 0.1 mmol/L。2 组均诱导分化培养基Ⅰ培养 2 d, 连续诱导 2 次后换用诱导分化培养基Ⅱ, 成分为： 高糖型 DMEM 培养基含 10 %胎牛血清、 100 U/mL 青霉素和 100 mg/L 链霉素混合液, 人胰岛素 10 mg/ L。培养 2 d, 连续诱导 2 次。倒置显微镜和油红 O 染色观察诱导前及诱导后 2 组细胞的形态变化。结果 小鼠前脂肪细胞 3T3-L1 状态良好, 呈现铺路石状生长, 均匀布满培养瓶底, 2 d 传代 1 次。四联诱导组诱导分化结果优于三联诱导组。三联诱导剂诱导前脂肪细胞后, 细胞形态并未发生明显变化。四联诱导剂诱导前脂肪细胞后, 可达到 90％以上的成熟脂肪细胞。成熟的脂肪细胞呈圆形, 有大量脂滴聚集, 油红 O 染色显现橘红色。结论 在三联诱导基础上加入吲哚美辛的四联诱导法可以更好地促进脂肪前体细胞分化。     

脂联素的球状结构域对3T3-L1脂肪细胞胰岛素抵抗模型AMPK信号通路的影响

目的观察脂联素的球状结构域(gAd)对3T3-L1脂肪细胞胰岛素抵抗(IR)模型AMPK信号通路的影响。方法将3T3-L1前脂肪细胞诱导分化为成熟的脂肪细胞。用软脂酸制备脂肪细胞IR模型,3个浓度的gAd干预已产生IR的3T3-L1脂肪细胞。用葡萄糖氧化酶法,检测培养液中葡萄糖的浓度;用RT-PCR法,检测腺苷酸活化蛋白激酶(AMPK)、脂肪酸分解代谢关键酶肉碱脂酰转移酶I(CPT-I)基因水平的变化;用Western blot法,检测AMPK Thr-172磷酸化水平。结果 gAd可促进3T3-L1脂肪细胞IR模型葡萄糖摄取,可增加3T3-L1脂肪细胞AMPK、CPT-I基因的表达,且与剂量呈正相关(均P=0.000);gAd可增加3T3-L1脂肪细胞AMPK Thr-172磷酸化水平,且与剂量呈正相关(P=0.000)。结论 gAd经AMPK途径,可改善3T3-L1脂肪细胞的IR。     

小檗碱抑制核因子NF-kBp65的核转位改善高糖诱导的3T3-L1细胞胰岛素抵抗的分子机制

目的：观察小檗碱对高糖诱导的3T3-L1脂肪细胞胰岛素抵抗模型核因子NF-kBp65表达及转位的影响，探讨小檗碱改善胰岛素抵抗的分子生物学机制。方法：以25mmol&#183;L^-1葡萄糖加0．6nmol&#183;L^-1胰岛素诱导3T3-L1脂肪细胞产生胰岛素抵抗，以小檗碱进行干预，同时阿司匹林作为阳性对照，以2-脱氧-[3H]-D-葡萄糖摄入法推算葡萄糖的转运率，用Westernblot检测3T3-L1脂肪细胞总NF-kBp65蛋白及核NF-kBp65蛋白的表达，激光扫描共聚焦（CLSM）对NF-kBp65蛋白进行定位显示。结果：25mmol&#183;L^-1葡萄糖加0．6nmol&#183;L^-1胰岛素作用18h后使3T3L1脂肪细胞胰岛素刺激的葡萄糖转运率抑制60％，Westernblot显示核NF-kBP65蛋白表达明显增加，CLSM显示NF-kBp65核转位增加；同时加入小檗碱或阿司匹林则可逆转上述效应。但高糖、小檗碱阿司匹林对3T3-L1脂肪细胞总NF-kBp65蛋白的表达无明显影响。结论：小檗碱可以改善高糖诱导的胰岛素抵抗，其分子机制可能与小檗碱抑制NF-kBp65的核转位有关。     

HDL对3T3-L1细胞葡萄糖转运的影响及其机制研究

目的探讨HDL对3T3-L1细胞葡萄糖转运的影响及其机制。方法通过对3T3-L1成纤维细胞的分化,培养符合实验要求的3T3-L1脂肪细胞。通过葡萄糖消耗实验和~3H标记的2-脱氧葡萄糖的摄取实验,研究HDL对葡萄糖转运的影响,应用RT-PCR和Western blot探讨其机制。结果 HDL可以促进3T3-L1脂肪细胞对葡萄糖的转运和摄取。3T3-L1脂肪细胞对葡萄糖的转运和摄取过程中,蛋白在RNA转录水平上没有增加,而是发生了AKT、AMPK蛋白的磷酸化。结论 HDL促进3T3-L1脂肪细胞对葡萄糖的摄取是通过AKT和AMPK两种途径来实现的。     

小鼠3T3-L1前脂肪细胞培养与诱导分化方法的建立

目的建立小鼠3T3-L1前脂肪细胞的培养及诱导分化为成熟脂肪细胞的方法。方法使用含10%胎牛血清（FBS）的高糖达氏修正伊氏培养基（DMEM）-F12液体培养基在体积分数5%二氧化碳（CO2）、37℃条件下常规培养3T3-L1细胞,2~3 d换液1次;诱导分化培养基Ⅰ培养2 d,诱导分化培养基Ⅱ培养2 d;基础培养基培养4~6 d,1~2 d换液1次。结果小鼠3T3-L1前脂肪细胞状态良好,成铺路石状生长,布满培养瓶底,3 d传代1次。90%以上细胞诱导分化成功,细胞呈圆形,有大量酯滴聚集,油红O染色呈橘红色。结论建立了小鼠3T3-L1前脂肪细胞的培养方法和诱导分化方法,为肥胖相关药物研究奠定了方法基础。     

五甲基槲皮素对3T3-L1前脂肪细胞分化及对脂肪细胞PPAR-γ和脂联素mRNA表达的影响

目的：比较PMQ和罗格列酮3T3-L1前脂肪细胞分化及脂肪细胞PPA脚和脂联素mRNA表达的影响。方法：待细胞融合2天后，加用胰岛素诱导3T3-L1前脂肪细胞分化。分化的过程中全程分别给予0.1，0.3，1,3，10，30，100μM的五甲基槲皮素和1，10μM的罗格列酮。诱导分化第12天，油红O染色，异丙醇洗脱后，570nm波长测值，     

胰高血糖素样肽-1对胰岛素抵抗3T3-L1脂肪细胞脂肪酸代谢的作用及机制

目的研究胰高血糖素样肽-1(GLP 1)对胰岛素抵抗3T3 L1脂肪细胞脂肪酸代谢的作用及机制。方法采用高糖高胰岛素造成胰岛素抵抗3T3 L1脂肪细胞模型,通过ELISA及Western blot等方法观察GLP 1对此模型脂肪酸代谢的影响及机制。结果 ELISA结果显示,GLP 1对胰岛素抵抗3T3 L1脂肪细胞中游离脂肪酸(FFA)的含量影响与胰岛素相关:在有胰岛素(100 nmol.L-1)存在时,GLP 1可增加上清液中FFA含量;而无胰岛素存在时,GLP 1可减少上清液中FFA含量。GLP 1升高细胞中脂肪酸合成酶(FAS)表达量的作用也必须依赖胰岛素的存在。Western blot结果显示在有胰岛素存在时,GLP 1可促进蛋白激酶B(PKB)磷酸化;而无胰岛素存在时则无此作用。PKB磷酸化的抑制剂LY294002或Wortmannin可阻断胰岛素存在时GLP 1对PKB磷酸化的促进作用及对上清液FFA含量的升高作用。另外,在有(无)胰岛素存在时,GLP 1均可降低激素敏感性脂肪酶(HSL)的蛋白表达量。结论 GLP 1可增强胰岛素抵抗3T3 L1脂肪细胞对胰岛素的敏感性并降低HSL的含量;胰岛素可影响GLP 1对胰岛素抵抗3T3 L1脂肪细胞脂肪酸代谢的调节作用。     

Stimulation of glucose uptake and improvement of insulin resistance by aromadendrin

Agents that stimulate glucose uptake and improve insulin resistance may be useful in the management of type 2 diabetes mellitus (DM). Thus, the aims of this study were to assess the effects of aromadendrin, a flavonoid from Gleditsia sinensis Lam., on stimulation of glucose uptake and improvement of insulin resistance and to characterize the molecular mechanisms underlying these activities. Insulin-stimulated glucose uptake was measured in HepG2 cells and in differentiated 3T3-L1 adipocytes using 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-D-glucose (2-NBDG), a fluorescent D-glucose analog. Expression of the peroxisome proliferator-activated receptor-γ2 (PPARγ2) and adipocyte-specific fatty acid binding protein (aP2) mRNAs and the PPARγ2 protein was analyzed in adipocytes using RT-PCR and immunoblotting, respectively. Insulin-stimulated protein kinase B (Akt/PKB) phosphorylation was measured in high glucose-induced, insulin-resistant HepG2 cells. Similar to 30 μmol/l rosiglitazone, treatment with 30 μmol/l aromadendrin significantly stimulated insulin-sensitive glucose uptake in both HepG2 cells and 3T3-L1 adipocytes. Aromadendrin treatment also enhanced adipogenesis and caused increases in the expression of PPARγ2 and aP2 mRNAs and the PPARγ2 protein in differentiated 3T3-L1 adipocytes. In high glucose-induced, insulin-resistant HepG2 cells, aromadendrin reversed the inhibition of Akt/PKB phosphorylation in response to insulin, which could be abrogated by pretreatment with LY294002, a phosphatidylinositol 3-kinase (PI3K) inhibitor. Aromadendrin treatment induced adipogenesis by increases in PPARγ2 expression, resulting in stimulation of glucose uptake and ameliorated insulin resistance. These findings suggest that aromadendrin may represent a potential therapeutic candidate for the management of type 2 DM.     

Cyanidin-3-rutinoside increases glucose uptake by activating the PI3K/Akt pathway in 3T3-L1 adipocytes

In this study, the effect of cyanidin-3-rutinoside (C3R) on glucose uptake by 3T3-L1 adipocytes was studied. C3R significantly increased glucose uptake, which was associated with enhanced plasma membrane glucose transporter type 4 (PM-GLUT4) expression in 3T3-L1 adipocytes. The potentiating effect of C3R on glucose uptake and PM-GLUT4 expression was related to enhanced phosphorylation of insulin receptor substrate 1 (IRS-1) and Akt, as well as augmented activation of phosphatidylinositol-3-kinase (PI3K) in the insulin signaling pathway. C3R induced glucose uptake was inhibited only by the PI3K inhibitor, but not by an AMPK inhibitor in 3T3-L1 adipocytes. Therefore, C3R likely up-regulates glucose uptake and PM-GLUT4 expression in 3T3-L1 adipocytes by activating the PI3K/Akt pathways.     

ATGL/HSL角度下解析Neu-p11改善胰岛素抵抗作用机制

目的探讨脂肪组织甘油三酯酶(adipose triglyceridelipase,ATGL)及激素敏感性脂肪酶(hormone-sensitive lipase,HSL)在褪黑素非选择性受体激动剂Neu-p11改善高糖高胰岛素(high glucose and insulin,HGI)诱导的3T3-L1脂肪细胞胰岛素抵抗(insulin resistance,IR)中的作用及机制。方法培养3T3-L1脂肪细胞,HGI诱导IR模型。以葡萄糖消耗量及细胞内甘油三酯(triglyceride,TG)定量测定作为检测指标,Western blot检测蛋白水平的表达情况。结果 HGI孵育减少脂肪细胞葡萄糖摄取,促进细胞内TG积聚,同时伴有ATGL及HSL的蛋白表达下调。Neu-p11干预逆转了HGI对脂肪细胞的作用效应,而MT2竞争性拮抗剂luzindole却拮抗了Neu-p11的上述效应。结论 Neu-p11以MT2受体依赖性方式抑制IR脂肪细胞TG沉积,可能与其上调AT-GL、HSL蛋白的表达,促进TG水解相关。     

Effects of arecoline on adipogenesis, lipolysis, and glucose uptake of adipocytes—A possible role of betel-quid chewing in metabolic syndrome

To investigate the possible involvement of betel-quid chewing in adipocyte dysfunction, we determined the effects of arecoline, a major alkaloid in areca nuts, on adipogenic differentiation (adipogenesis), lipolysis, and glucose uptake by fat cells. Using mouse 3T3-L1 preadipocytes, we showed that arecoline inhibited adipogenesis as determined by oil droplet formation and adipogenic marker gene expression. The effects of arecoline on lipolysis of differentiated 3T3-L1 adipocytes were determined by the glycerol release assay, indicating that arecoline induced lipolysis in an adenylyl cyclase-dependent manner. The diabetogenic effects of arecoline on differentiated 3T3-L1 adipocytes were evaluated by the glucose uptake assay, revealing that ≥ 300 µM arecoline significantly attenuated insulin-induced glucose uptake; however, no marked effect on basal glucose uptake was detected. Moreover, using 94 subjects that were randomly selected from a health check-up, we determined the association of betel-quid chewing with hyperlipidemia and its related risk factors. Hyperlipidemia frequency and serum triglyceride levels of betel-quid chewers were significantly higher than those of non-betel-quid chewers. In this study, we demonstrated that arecoline inhibits adipogenic differentiation, induces adenylyl cyclase-dependent lipolysis, and interferes with insulin-induced glucose uptake. Arecoline-induced fat cell dysfunction may lead to hyperlipidemia and hyperglycemia/insulin-resistance. These findings provide the first in vitro evidence of betel-quid chewing modulation of adipose cell metabolism that could contribute to the explanation of the association of this habit with metabolic syndrome disorders.     

Gly-Ala-Gly-Val-Gly-Tyr, a novel synthetic peptide, improves glucose transport and exerts beneficial lipid metabolic effects in 3T3-L1 adipoctyes

Recently, it has been demonstrated that fibroin and fibroin-derived peptides enhances insulin sensitivity and glucose metabolism in adipocytes. Here, we show that a synthetic hexapeptide Gly-Ala-Gly-Val-Gly-Tyr (GAGVGY) derived from repetitive amino acid sequence of fibroin improves glucose transport and exerts beneficial lipid metabolic effects in 3T3-L1 adipocytes. GAGVGY increases both basal and insulin-stimulated glucose uptake through enhancement of GLUT1 expression and PI 3-K-dependent GLUT4 translocation, respectively. GAGVGY treatment also led to a significant reduction in the expression of lipogenic genes including sterol regulatory element binding protein-1c (SREBP1c), peroxisome proliferator-activated receptor-γ (PPARγ), and fatty acid synthase (FAS) in mature 3T3-L1 adipocytes, which was corroborated with decreased lipid accumulation by GAGVGY treatment. Additionally, in cells undergoing differentiation, mRNA levels of adipogenic genes including PPARγ and CCAAT/enhancer binding protein α (C/EBPα), stearoyl-CoA desaturase 1 (SCD1), and FAS were suppressed by GAGVGY. Furthermore, GAGVGY increased AMP-activated protein kinase (AMPK) phosphorylation and adiponectin secretion in 3T3-L1 adipocytes. The latter effect was supported with evidence showing increased AMPK activation in C2C12 myocytes treated with 3T3-L1-adipocyte-conditioned medium. Together, our data suggest that GAGVGY has multiple beneficial effects on glucose and lipid metabolism, and would control hyperglycemia without the adverse effect of weight gain.     

Effects of 4-nonylphenol on adipogenesis in 3T3-L1 preadipocytes and C3H/10T1/2 mesenchymal stem cells

Obesogens are a subset of endocrine disruptor chemicals (EDCs) that cause obesity. The typical EDC 4-nonylphenol (4-NP) has been identified as an obesogen. However, the in vitro effects of 4-NP on adipogenesis remain unclear. In this study, 3T3-L1 preadipocytes and C3H/10T1/2 mesenchymal stem cells (MSCs) were used to investigate the influence of 4-NP on adipogenesis. The differentiation protocols for 3T3-L1 preadipocytes and C3H/10T1/2 MSCs took 8 and 12 days, respectively, beginning at Day 0. In differentiated 3T3-L1 preadipocytes, 20 μM 4-NP decreased cell viability on Days 4 and 8. Exposure to 4-NP inhibited triglyceride (TG) accumulation and adipogenic marker expression on Days 0–8, but the inhibitory effects were weaker on Days 2–8. The protein expression of pSTAT3 or STAT3 decreased on Days 0–8 and 2–8. Conversely, 4-NP promoted TG accumulation and the adipogenic marker expression in C3H/10T1/2 adipocytes. The opposing effects were attributed to physiological differences between the two cell lines. The 3T3-L1 preadipocytes are dependent on mitotic clonal expansion (MCE) to drive differentiation, while C3H/10T1/2MSCs and human preadipocytes are not. Additionally, 4-NP downregulated β-catenin expression in C3H/10T1/2 adipocytes. Accordingly, we hypothesized that 4-NP promotes adipogenesis. The role of the canonical Wnt pathway in the promotion of adipogenesis by 4-NP requires further validation. This study provides new insights into the mechanisms and appropriate risk management of 4-NP.     

吡格列酮改善氧化应激导致的脂肪细胞胰岛素抵抗

目的:观察吡格列酮对氧化应激导致的脂肪细胞胰岛素抵抗的作用,初步探讨其机制。方法:葡萄糖氧化酶(GO)作用培养于高糖DMEM的3T3-L1细胞产生H2O212小时后观察胰岛素刺激的葡萄糖摄取(ISGU)和胰岛素信号通路主要分子的活化状态以及吡格列酮的影响。结果:GO导致的氧化应激抑制ISGU和IRS-1酪氨酸及PKB磷酸化,其机制可能与氧化应激导致IRS-1丝氨酸307磷酸化有关;氧化应激的作用可被吡格列酮部分逆转。结论:吡格列酮可以减轻氧化应激导致的脂肪细胞胰岛素抵抗,改善胰岛素信号传导。