单纯性肥胖症患者外周血Obestatin、Ghrelin与胰岛素抵抗的关系

目的:探讨单纯性肥胖症患者外周血肥胖抑制素Obestatin、Ghrelin的变化以及与胰岛素抵抗(Insulin resistance,IR)的关系.方法:选取我校2017、2018级学生为研究对象,分为体质指数(Body mass index,BMI)≥28㎏?m-2的单纯性肥胖症组(n=30)和正常对照组(n=2...     

胰岛素抵抗综合征患者血视黄醇结合蛋白4和脂联素的相关性研究

目的：研究超重或肥胖（OW/OB）、糖调节受损（IGR）及2型糖尿病（T2DM）患者血浆视黄醇结合蛋白4（RBP4）的变化及与脂联素（APN）、糖脂代谢、胰岛素敏感性等的相关性。方法:采用酶联免疫吸附法测定了22例对照组、30例OW/OB、30例IGR和35例T2DM患者血浆RBP4和APN水平，测定空腹血糖、胰岛素、血脂，量腰围、臀围，计算腰臀比，测身高及体重，计算体重指数。结果:RBP4在OW/OB组、IGR组和T2DM组均较正常组高（P<0.01），IGR组较OW/OB组高（P<0.01），但IGR组和T2DM组间差异无显著。相关分析显示RBP4与W、WHR、FPG、HOMA-IR、TG显著相关（相关系数分别为r=0.550、0.444、0.552、0.545、0.555）；多元逐步回归分析显示，FPG、TG、WHR、HOMA-IR是RBP4的独立相关因素（决定系数分别为r2=0.457、0.308、0.531、0.558）。无论是研究对象总体还是各亚组，RBP4与APN均无相关。结论:胰岛素抵抗综合征患者血浆RBP4水平显著升高。RBP4与APN无相关，表明调节不同的脂肪细胞因子分泌的信号是不同的。     

Influence of insulin resistance on adiponectin receptor expression in breast cancer

Objective

Adipositas and insulin resistance are modifiable risk factors for breast cancer. Adiponectin seems to be an important linkage of these associations. In this study, we investigated the relationship between intratumoral adiponectin receptor expression and insulin resistance as well as intratumoral insulin/IGF receptor expression in breast cancer specimen.

Methods

Breast cancer tissue and fasting serum were collected from 26 female patients. After microdissection of frozen samples, RNA was isolated and expression of insulin receptor, IGFR1, IGFR2, AdipoR1 and AdipoR2 was measured on mRNA level by means of real time RT-PCR. Fasting insulin, glucose and c-peptide serum levels were analysed by ELISA. Insulin resistance was calculated using the HOMA model.

Results

We were able to confirm AdipoR1 and AdipoR2 expression, respectively, in breast cancer specimen. Actually, neither insulin serum level nor whole-body insulin resistance showed any effect on insulin/IGF or adiponectin receptor expression in breast cancer. A strong positive correlation between insulin as well as IGF1 receptor and AdipoR1, but not AdipoR2, expression could be observed. Interestingly, AdipoR2 expression significantly correlated with vascular and lymphovascular invasion of breast cancer.

Conclusion

We propose a close relationship between the intratumoral insulin signalling system and AdipoR1 but not AdipoR2 expression. As AdipoR2 but not AdipoR1 expression seems to correlate with invasiveness, we assume different functions of the two adiponectin receptors in breast cancer.     

小于胎龄儿大鼠胰岛素抵抗与ghrelin水平的关系

目的 观察小于胎龄儿(SGA)大鼠胰岛素敏感指数和ghrelin水平的变化及相关关系;探讨ghrelin在SGA导致胰岛素抵抗过程中的作用和意义.方法 采用SD大鼠母鼠妊娠期饥饿法建立SGA大鼠模型,按生后第4周身长和(或)体质量的差异分为有生长追赶组(S1组,n=26)、无生长追赶组(S2组,n=31);以自由饮水及自由进食母鼠娩出之雄性鼠仔为正常对照组(C组,n=27).各组大鼠4周龄时测定体质量及血ghrelin水平,12周龄测定体质量及血ghrelin、空腹血糖、空腹胰岛素并计算胰岛素敏感指数,分析各指标之间的相关性.结果 12周龄SGA大鼠胰岛素敏感指数较C组下降(S1组:2.00±0.58,S2组:2.23±0.58比C组:3.17±0.54,均P＜0.05);血ghrelin水平较C组下降,但差异无统计学意义[S1组:(1.357±0.548)μg/L,S2组:(1.428±0.714)μg/L比C组:(1.843±0.459)μg/L,均P＞0.05].12周龄大鼠血ghrelin水平与空腹血胰岛素水平呈负相关(r=-0.836,P＜0.01),而与胰岛素敏感指数呈正相关(r=0.810,P＜0.01).结论 成年SGA大鼠血ghrelin水平降低与胰岛素抵抗有关,低ghrelin水平可能是胰岛素抵抗的结果.     

子痫前期患者孕中期血清脂联素水平及胰岛素抵抗的变化及意义

目的测定子痫前期（preeclampsia,PE）孕妇孕中期血清脂联素及胰岛素抵抗的变化并探讨其意义。方法随机选择2009年7月至2010年7月在青岛大学医学院第二附属医院门诊检查的孕妇300名,进行前瞻性研究分析,根据妊娠结局,发展为子痫前期共31人纳入研究组（PE,n=31）,同时选取30名正常孕妇作为对照组。于24～28孕周时,采用放射免疫吸附法测定血清脂联素（adiponectin,APN）、胰岛素（Fastig insulin,Fins）,并测定空腹血糖（fasting blood sugar,FBG）及其他临床指标,稳定模型的胰岛素抵抗指数（homeostatic model assessment-insulin resistance,HOMA-IR）用（Fins×FBG）/22.5来表示。并进行相关分析。结果①子痫前期组孕妇平均动脉压（mean arterial blood pressure,MABP）与对照组比较明显升高,有统计学意义（P〈0.01）。②研究组与对照组比较,血清脂联素水平明显降低,有统计学差异（P〈0.01）。血清胰岛素及HOMA-IR明显升高,有统计学差异（P均〈0.01）。FBG两组比较无统计学差异（P〉0.05）。③研究组孕妇血清脂联素与胰岛素、HOMA-IR及MABP呈负相关（r=-0.87,r=-0.44,r=-0.51,P均〈0.01）,与BMI无相关关系（r=-0.26,P〉0.05）。研究组孕妇HOMA-IR与胰岛素、MABP呈正相关（r=0.42,r=0.77,P均〈0.01）,与BMI无相关关系（r=-0.04,P〉0.05）。结论孕中期低脂联素水平及高胰岛素抵抗与子痫前期的发生有关。     

脂质灌注对大鼠血浆抵抗素和ghrelin的影响*

目的：探讨脂质灌注对大鼠血浆抵抗素和ghrelin的影响。 方法： 采用正糖钳夹技术，在钳夹前后分别测定生理盐水对照组和脂质灌注组血浆抵抗素和ghrelin浓度，并用［3H］-葡萄糖作为示踪剂测定外周组织和肝糖的代谢。 结果： 脂质灌注组大鼠血浆游离脂肪酸（FFA）明显增加（P<0.01），葡萄糖输注率（GIR）明显降低（P<0.01）。对照组肝糖产率（HGP）明显被抑制（88%）。脂质输注组胰岛素对HGP的抑制作用明显减弱。在钳夹期间，脂质组与对照组比葡萄糖清除率（GRd）轻度降低。在正糖钳夹术结束时，对照组血浆ghrelin水平与钳夹前相比明显降低(P<0.05)。4 h的脂质灌注也引起了血浆ghrelin浓度的明显下降(P<0.05)，但是在钳夹结束时和对照组比没有明显差异。相关性分析表明空腹血浆ghrelin水平与空腹胰岛素和血糖呈明显负相关（r=-0.52和r=-0.61, P<0.05）。脂质灌注后大鼠血浆抵抗素水平较灌注前和对照组明显升高（P<0.01），空腹血浆抵抗素浓度与空腹FFA（r=0.68, P<0.01）、血糖（r=0.66, P<0.01）呈明显正相关。 结论： 脂质灌注诱导了肝脏和外周的胰岛素抵抗，抵抗素在胰岛素抵抗的形成中可能具有重要作用。高胰岛素血症，而不是游离脂肪酸，降低了大鼠循环ghrelin水平。     

利拉鲁肽对非酒精性脂肪肝大鼠脂联素及胰岛素抵抗的影响

 目的：观察利拉鲁肽（Lira）对非酒精性脂肪肝（NAFLD）大鼠血清和肝组织脂联素（ADP）及胰岛素抵抗的影响。方法：雄性SD大鼠30只,随机分为3组,分别予普通饮食（ND组）10只、高脂饮食（HFD组）10只和高脂饮食加利拉鲁肽腹腔注射（Lira组）10只。高脂饮食12周建立大鼠NAFLD模型,建模成功后Lira组予利拉鲁肽腹腔注射治疗4周。16周末处死各组大鼠,生物化学法检测丙氨酸氨基转移酶（ALT）、空腹血糖（FBG）、甘油三酯（TG）及总胆固醇（TC）,分光光度计测定游离脂肪酸（FFAs）,酶联免疫吸附法测定胰岛素和ADP。结果：与HFD组比较,Lira组大鼠体质量、肝指数、胰岛素抵抗指数、血清TG、TC、ALT、FBG及肝匀浆TG、TC、FFAs显著下降（均P<0.05）,血清及肝组织ADP明显升高（P＜0.05）,肝脏脂肪变性程度明显减少至恢复正常（P<0.05）,肝组织ADP含量与肝脏FFAs含量呈负相关。结论:利拉鲁肽改善胰岛素抵抗和肝脏脂肪变的可能机制之一与其升高血清及肝组织脂联素水平有关。     

瘦素、脂联素与妊娠期糖尿病胰岛素抵抗关系的研究

目的探讨瘦素、脂联素与妊娠期糖尿病胰岛素抵抗的关系。方法采用稳态模型评估法评估正常糖耐量孕妇（NGT）糖耐量减低孕妇（GIGT）和妊娠期糖尿病孕妇（GDM）的胰岛素抵抗指数,采用放射免疫分析方法检测其血浆瘦素、脂联素、血糖及胰岛素水平。结果 GDM组和GIGT组HOMA-IR显著高于NGT组,GDM组HOMA-IR显著高于GIGT组。血清瘦素水平由NGT组到GIGT组和GDM组呈显著增高,瘦素与空腹胰岛素、孕晚期体重指数、HOMA-IR呈显著正相关;血清脂联素由NGT组到GIGT组和GDM组呈显著下降,脂联素与空腹胰岛素、孕晚期体重指数、HOMA-IR呈显著负相关。结论瘦素、脂联素水平与GDM患者IR程度密切相关,其水平可作为预测妊娠期糖尿病胰岛素敏感性的指标,将来可能是治疗妊娠期糖尿病的新靶点。     

Peptide YY, cholecystokinin, insulin and ghrelin response to meal did not change, but mean serum levels of insulin is reduced in children with Prader-Willi syndrome

Prader-Willi syndrome (PWS) is a contiguous gene syndrome characterized by uncontrollable eating or hyperphagia. Several studies have confirmed that plasma ghrelin levels are markedly elevated in PWS adults and children. The study of anorexigenic hormones is of interest because of their regulation of appetite by negative signals. To study the pattern and response of the anorexigenic hormones such as cholecystokinin (CCK) and peptide YY (PYY) to a meal in PWS, we measured the plasma CCK, PYY, ghrelin and serum insulin levels in PWS patients (n=4) and in controls (n=4) hourly for a day, and analyzed hormone levels and hormonal responses to meals. Repeated measures of ANOVA of hormone levels demonstrated that only insulin levels decreased (p=0.013) and CCK (p=0.005) and ghrelin (p=0.0007) increased in PWS over 24 hr. However, no significant group x time interactions (ghrelin: p=0.89, CCK: p=0.93, PYY: p=0.68 and insulin: p=0.85) were observed; in addition, there were no differences in an assessment of a three-hour area under the curve after breakfast. These results suggest that the response pattern of hormones to meals in PWS patients parallels that of normal controls. In addition, the decrease of insulin levels over 24 hr, in spite of obesity and elevated ghrelin levels, suggests that the baseline insulin level, not the insulin response to meals, may be abnormal in patients with PWS.     

两种不同胰岛素抵抗状态的大鼠高脂联素血症产生的机制研究

目的:初步探讨胰岛素抵抗的Zucker肥胖大鼠(ZF鼠)及嘌呤霉素(PA)诱导的肾病综合征(DN)大鼠高脂联素(ADPN)血症的产生机制。方法:8周龄肥胖Zucker大鼠(ZF大鼠)正常饮食4周,及Wistar大鼠腹腔注射PA后10 d留取血、24 h尿标本,检测血脂系列、ADPN、白蛋白(ALB)及24 h尿白蛋白排泄率(UAER);并行多次取样的静脉糖耐量试验(FSIVGTT),根据Bergman微小模型法计算胰岛素敏感性指数(SI)及葡萄糖效应指数(SG);留取大鼠附睾白色脂肪组织称重。分析ADPN与各指标的相关性。结果:ZF大鼠及PA注射大鼠ADPN水平均显著高于对照组［(7.44±1.23）mg/L vs （2.44±0.33)mg/L及(8.64±0.88）mg/L vs （2.95±0.46)mg/L, P<0.0)］。ZF大鼠SI、SG显著降低且与ADPN负相关;DN大鼠SI、SG与对照鼠比较无明显变化,且与ADPN无相关性。两种大鼠模型均有明显高脂血症并与ADPN正相关。ZF鼠及DN鼠尿白蛋白排泄显著增多［(64.8±14.2) mg/24 h vs (14.9±14.6)mg/24 h及(275.1±64.5)mg/24 h vs (15.4± 4.5)mg/24 h, P<0.01］且与ADPN显著正相关。ZF大鼠白色脂肪比例高于对照鼠,但与ADPN升高水平不成比例,DN大鼠白色脂肪组织无增多。两种大鼠肌酐清除率与对照组比较均无显著差别。结论:ZF大鼠及PA注射鼠呈高ADPN血症,胰岛素敏感性与ADPN无关;两种大鼠UAER明显升高可能是高ADPN血症发生的主要机制。     

Prediction of metabolic syndrome using artificial neural network system based on clinical data including insulin resistance index and serum adiponectin

Objective

This study aimed to predict the 6-year incidence of metabolic syndrome (MetS) using an artificial neural network (ANN) system and multiple logistic regression (MLR) analysis based on clinical factors, including the insulin resistance index calculated by homeostasis model assessment (HOMA-IR).

Design

Subjects were recruited from participants in annual health check-ups in both 2000 and 2006. A total of 410 Japanese male teachers and other workers at Keio University, 30–59 years of age at baseline, participated in this retrospective cohort study.

Measurements

Clinical parameters were randomly divided into a training dataset and a validation dataset, and the ANN system and MLR analysis were applied to predict individual incidences. The leave some out cross validation method was used for validation.

Results

The sensitivity of the prediction was 0.27 for the MLR model and 0.93 for the ANN system, while specificities were 0.95 and 0.91, respectively. Sensitivity analysis employing the ANN system identified BMI, age, diastolic blood pressure, HDL-cholesterol, LDL-cholesterol and HOMA-IR as important predictors, suggesting these factors to be non-linearly related to the outcome.

Conclusion

We successfully predicted the 6-year incidence of MetS using an ANN system based on clinical data, including HOMA-IR and serum adiponectin, in Japanese male subjects.     

高脂饮食导致大鼠肝脏胰岛素抵抗的作用机制研究

目的: 本研究旨在建立SD大鼠胰岛素抵抗模型,观察高脂饲料喂养的SD大鼠肝脏中氧化应激以及胰岛素抵抗的发生,分析胰岛素抵抗状态下活性氧(ROS)的变化,初步探讨ROS的主要来源。方法: 以高脂饲料喂养6只4周龄雄性SD大鼠12周,建立大鼠胰岛素抵抗模型。用优越血糖仪以电子感应法测定血糖,放射免疫法检测血清胰岛素水平。二氢乙啶(DHE)染色观察肝脏组织中的ROS水平。Western blotting检测NADPH氧化酶3(NOX3)的表达。结果: 以高脂饲料喂养12周后,大鼠空腹血糖水平略有上升,但与对照组的大鼠相比无显著差异,而胰岛素敏感指数降低。蒽酮法的检测结果显示高脂饲料喂养大鼠肝组织糖原含量显著降低,高脂饮食大鼠肝组织中NOX3的表达显著增加,DHE染色显示肝组织ROS水平显著增加,提示ROS在肝胰岛素抵抗发生中起重要作用。结论: 高脂饲料喂养SD大鼠胰岛素敏感指数降低,肝组织中NOX3表达和ROS水平显著增加,糖原含量显著降低。     

妊娠期糖尿病组脐血脂联素的变化及意义

目的观察妊娠期糖尿病脐血脂联素水平的变化,分析其与新生儿出生体重、劳雷尔指数及胰岛素抵抗之间的关系。方法应用酶联免疫吸附法及放射免疫分析法分别测定30例正常妊娠及26例妊娠期糖尿病新生儿脐血血清脂联素及胰岛素水平,同时测定空腹血糖、新生儿体重及身高,计算HOMA-IR指数及劳雷尔指数。结果 （1）妊娠期糖尿病组新生儿脐血脂联素水平低于正常对照组（P〈0.05）;（2）脐血脂联素水平与新生儿出生体重、劳雷尔指数及HOMA-IR呈显著负相关。结论妊娠期糖尿病组新生儿脐血脂联素水平明显下降,并与体脂含量及胰岛素抵抗相关,提示脂联素可能参与了胎儿的宫内发育过程。     

白杨素对胰岛素抵抗小鼠的干预研究

目的:研究白杨素对胰岛素抵抗小鼠模型的干预作用及其相应机制。方法:40只雄性C57小鼠,根据饮食随机分为对照组、胰岛素抵抗组、白杨素低剂量组及高剂量组,每组各10只。喂养24周后检测各组小鼠体重、肝指数和脂肪指数,评价胰岛素抵抗状况(血糖、胰岛素水平及HOMA-IR)及氧化应激水平(SOD、GSH-Px和MDA);real-time PCR检测肝脏胰岛素信号通路分子(IR、IRS1、IRS2、Glut2和Glut4)及炎症分子(TNF-α、IL-1β、IL-6和NF-κB)mRNA表达水平。Western blot检测肝脏关键信号蛋白(IRS1和p65)及其磷酸化的水平。结果:经过24周干预后,胰岛素抵抗组小鼠明显肥胖,体脂沉积显著(P0.01),血糖、胰岛素水平及HOMA-IR指数均高于对照组(P0.01),且肝脏氧化应激增加(P0.05),成功建立胰岛素抵抗模型。白杨素干预后,无论低剂量组还是高剂量组小鼠体重、血糖较胰岛素抵抗组上升缓慢(P0.05),血清胰岛素水平及HOMA-IR亦明显降低(P0.05),肝脏氧化应激水平明显下降(P0.05)。白杨素能够上调胰岛素信号通路中IR、IRS1、IRS2、Glut2及Glut4的mRNA表达,同时降低各炎症因子的表达,对NF-κB有抑制作用(P0.05)。其中高剂量组在炎症抑制方面更强(P0.05)。Western blot实验结果提示白杨素的改善作用与上调p-IRS1及下调p-p65相关。结论:白杨素降低了肥胖、高血糖及高胰岛素血症,缓解了胰岛素抵抗及氧化应激,这一作用可能与其调控胰岛素信号通路及抑制炎症因子表达密切相关。     

Common polymorphisms in the PPARgamma2 and IRS-1 genes and their interaction influence serum adiponectin concentration in young Finnish men

The Gly972Arg substitution of the insulin receptor substrate-1 (IRS-1) gene and the Pro12Pro genotype of the peroxisome proliferator-activated receptor gamma 2 (PPARgamma2) gene have been suggested to be associated with type 2 diabetes mellitus. In this study, the influence of these two polymorphisms on serum adiponectin concentrations was investigated. The Pro12Ala polymorphism of the PPARgamma2 gene and the Gly972Arg polymorphism of the IRS-1 gene were genotyped in 252 young Finnish servicemen. The Ala12Ala genotype of PPARgamma2 was associated with a higher adiponectin level compared to the Pro12Ala genotype (p=0.02) and the Pro12Pro genotype (p=0.02). Total (p=0.02) and low-density lipoprotein (LDL) cholesterol (p=0.03) levels were higher in subjects with the Pro12Pro genotype compared to the Pro12Ala genotype. No difference was observed in serum adiponectin level between the IRS-1 genotype groups. The subjects with X972Arg of this gene had high total and LDL cholesterol levels (p<0.05). The interaction between the PPARgamma2 and IRS-1 genes with respect to their effects on adiponectin levels was statistically significant (p=0.02). Adiponectin was significantly higher (p<0.05) in subjects who simultaneously had the Ala/Ala (PPARgamma2)+Gly/Gly (IRS-1) genotype combination compared to subjects with the Pro/Pro+Gly/Gly and Pro/Ala+Gly/Gly genotype combinations. Total and LDL cholesterol was higher (p<0.05) in subjects with Pro/Pro+X/Arg compared to subjects with the two before mentioned genotype combinations. We conclude that the Ala12Ala genotype of PPARgamma2 is associated with elevated adiponectin level, and that the PPARgamma2 and IRS-1 genes have a possible interaction in their effects on adiponectin concentration.     

多囊卵巢综合征患者血清IGF-1水平与胰岛素抵抗

目的探讨血清胰岛素样生长因子1(IGF-1)、胰岛素敏感指数(ISI)与多囊卵巢综合征(PCOS)的关系。方法采集90例PCOS患者和41例正常对照组血清,应用电化学发光法检测胰岛素水平,葡萄糖氧化酶终点法检测空腹葡萄糖(FPG)水平,酶联免疫吸附试验(ELISA)检测IGF-1水平。结果 1.PCOS患者FPG、血清胰岛素、IGF-1水平明显高于正常对照组(t=16.72,2.24,4.51;P<0.01),且均与患者是否肥胖高度相关(t=5.08,2.07,3.30;P<0.01);2.PCOS患者胰岛素敏感性明显低于对照组,差别有显著性意义(t=3.12,P<0.05);3.PCOS患者血清IGF-1的含量与胰岛素敏感指数呈显著负相关,差别有显著性意义(r=-0.57,P<0.05);对照组血清IGF-1含量与胰岛素敏感指数无明显相关性(r=0.14,P>0.05)。结论多囊卵巢综合征患者存在不同程度的胰岛素抵抗(IR),IGF-1水平增高与PCOS患者发生IR有关,IGF-1可能与PCOS发生、发展有一定的内在联系并起协同作用。     

Resveratrol increases serum adiponectin level and decreases leptin and insulin level in an experimental model of hypercholesterolemia

Serum adiponectin concentration is inversely associated with leptin and insulin concentration. There is little paucity of information in the literature on the adipokine levels and regulation by resveratrol in cholesterol diet-fed animals. Thirty rabbits were randomly divided into six groups, each of five animals: Group 1 = control (C), Group 2 = cholesterol diet (CD) only, Group 3 = resveratrol 200?mg/kg (R200), Group 4 = resveratrol 400?mg/kg (R400), Group 5 = CD + R200, Group 6 = CD + R400. The preparations were administered for 8th weeks of the treatment protocol. weight and blood glucose level were measured on week zero and the 8th week of the treatment. At the end of the study period, the rabbits were placed under light anaesthesia. Blood samples were evaluated for serum concentrations of metabolites assays (adiponectin, leptin and insulin). Serum adiponectin significantly (P < 0.05) increased in resveratrol + CD groups, compared to CD group only. Leptin and insulin significantly (P <0.05) decreased in CD groups co-administered with resveratrol, compared with CD group only. In conclusion, the increase in adiponectin level and decrease in leptin and insulin level following resveratrol administration elucidated the therapeutic potential of resveratrol, despite cholesterol diet consumption.     

甘氨酸对高果糖饮食诱导的大鼠胰岛素抵抗及认知功能损害的影响

目的: 探讨肠源性内毒素血症(IETM)在长期高果糖饮食诱导的大鼠胰岛素抵抗(IR)及认知功能损害中的作用,及甘氨酸对其的保护机制。方法: 模型组大鼠以8%果糖水喂养,干预组给予8%果糖+1%甘氨酸水喂养。每月检测体重及收缩压。8个月后,检测血糖、血脂、糖耐量及血浆内毒素(LPS)变化;ELISA法检测血浆胰岛素、血浆及皮层促炎因子水平;计算胰岛素抵抗指数(HOMA-IR);Western blotting测定皮层胰岛素受体信号转导蛋白的表达;应用Morris水迷宫测试大鼠认知功能。结果: 模型组在第3月~第6月体重增长明显,第3月后收缩压明显升高;甘氨酸在第4月和第6月显著降低模型组体重增长,第4~第6月降低收缩压的升高。甘氨酸部分改善模型组血脂和糖耐量异常,降低血浆LPS、血浆胰岛素、HOMA-IR、血浆和皮层促炎因子水平。此外,甘氨酸还明显改善模型组皮层胰岛素信号转导蛋白的异常表达及认知功能损害。结论: 长期高果糖饮食诱导大鼠发生外周及中枢的IR,同时伴有IETM和轻度炎症;甘氨酸通过减轻IETM改善高果糖饮食诱导的IR和认知功能损害。     

大鼠血清网膜素-1水平与胰岛素抵抗的相关性

 目的：建立胰岛素抵抗大鼠模型,探讨血清网膜素-1水平与胰岛素抵抗的相关性。方法：30只SPF级雄性Wistar大鼠随机分为正常对照组（NC,n=15）、高脂饮食组（HF,n=15）,自由摄食、饮水,NC组给予普通饲料,HF组给予高脂饲料诱导胰岛素抵抗模型。10周后2组各取5只行高胰岛素正葡萄糖钳夹实验评估模型,ELISA法检测血清网膜素-1,放射免疫法检测血清基础胰岛素。结果：（1）各组大鼠基础血糖比较无显著差异（P>0.05）。（2）HF组血清基础胰岛素水平较NC组明显升高（P<0.05）,但血清网膜素-1水平较NC组明显降低（P<0.01）。（3）Pearson相关性分析示血清网膜素-1分别与胰岛素(r=-0.654,P<0.01)和游离脂肪酸(r=-0.446,P<0.05)呈负相关。结论：在大鼠胰岛素抵抗阶段,血清网膜素-1水平已经开始降低;基础胰岛素水平随着血清网膜素-1水平的降低而升高,推测血清网膜素-1水平降低可能成为胰岛素抵抗、糖尿病及心血管疾病的早期提示因子。     

多囊卵巢综合征患者血清中瘦素水平与胰岛素抵抗关系的研究

目的探讨多囊卵巢综合征（PCOS）患者血清中瘦素（Leptin）与胰岛素抵抗的关系。方法测定了56例PCOS患者和30例正常妇女血清中的瘦素、血糖和胰岛素水平；用胰岛素抵抗指数（IR）和胰岛素敏感指数（ISI）以及胰岛素曲线下面积（AUC）作为评价患者胰岛素抵抗的指标，相关性分析探讨瘦素与胰岛素抵抗的关系。结果PCOS组患者血糖、胰岛素及Leptin水平明显高于对照组（P〈0．05）；PCOS纽中瘦素与FINS（r=0．655，P〈0．0I）、IR（r=0．442，P〈0．01）、AUC（r=0．520，P〈0．01）、ISI（r=0．458，P〈0．05）均呈正相关关系。结论瘦素可能参与PCOS发生、发展有关，PCOS患者血清中瘦素水平与胰岛素抵抗存在一定的相关性。