血清脂联素与2型糖尿病合并脑梗死的相关性研究

目的探讨血清脂联素(APN)与2型糖尿病合并脑梗死和相关代谢指标的关系。方法采取酶联免疫测定法(ELISA)测定单纯2型糖尿病患者(37例)、2型糖尿病合并脑梗死患者(31例)及正常对照者(30名)空腹血清脂联素浓度,并测定各组的血压、空腹血糖、糖化血红蛋白(HbA1c)和血脂水平,分析脂联素水平的变化及其与各指标间的相关性。结果单纯2型糖尿病组血清APN水平低于正常对照组(P<0.05),2型糖尿病合并脑梗死组血清APN水平低于单纯2型糖尿病组(P<0.01);血清APN水平与体质量指数(BMI)、HbA1c呈独立负相关,与高密度脂蛋白胆固醇呈独立正相关。结论血清APN在2型糖尿病患者中明显降低,合并脑梗死患者降低更明显,提示血清APN水平降低可能是发生糖尿病及糖尿病大血管病变的一个独立危险因素。     

脑梗死合并代谢综合征患者脂联素水平与代谢紊乱的关系

目的 探讨脑梗死合并代谢综合征(MS)患者脂联素水平及其与代谢紊乱的相关性.方法 根据国际糖尿病联盟(IDF)MS诊断标准,将74例急性脑梗死患者分为MS组及非MS组;根据患者脑梗死危险因素多少将MS组进一步分为三危险因素MS组和四危险因素及以上MS组.检测各组血浆脂联素和血清高密度脂蛋白(HDL)、低密度脂蛋白(LDL)、甘油三酯(TG)及总胆固醇(TC)水平,并行多因素直线相关分析.结果 MS组脂联素水平较非MS组明显降低,同时伴有TG明显升高;四危险因素及以上MS组脂联素水平较三危险因素MS组明显降低,同时伴有TG水平升高及HDL水平降低;脂联素水平与TG水平呈负相关(b=-1.089,b’=-O.317,P=0.002).结论 脑梗死合并MS患者脂联素水平低;脂联素与代谢紊乱存在相关性.     

2型糖尿病患者血清抵抗素、脂联素与下肢动脉病变的关系

目的 探讨初诊2型糖尿病患者空腹血清抵抗素、脂联素水平与下肢动脉病变(PAD)的关系.方法 根据踝肱指数(ABI)将96例初诊2型糖尿病患者分为PAD组和非PAD组,另选取52例健康体检者作为正常对照组,测定患者空腹血清抵抗素、脂联素、血糖、血脂及胰岛素,测量身高、体重、血压;计算体重指数(BMI)、胰岛素抵抗指数(HOMA-IR).结果 1.与正常对照组相比,2型糖尿病患者血清抵抗素水平明显升高(P＜0.01),脂联素水平明显降低(P＜0.01).2.与非PAD组相比,PAD组患者年龄明显偏高(P＜0.01),血清总胆固醇(TC)、低密度脂蛋白(LDL)水平升高(P＜0.05)、HOMA-IR、血清抵抗素明显升高(P＜0.01),脂联素水平降低(P＜0.01).3.相关分析表明,2型糖尿病患者血清脂联素与ABI呈正相关(r=0.367,P＜0.05),血清抵抗素与ABI负相关(r=-0.421,P＜0.05).结论 2型糖尿病合并PAD患者血清抵抗素、脂联素水平明显改变且与ABI相关,抵抗素、脂联素可能在2型糖尿病下肢动脉病变的发生发展中起重要作用.     

初诊2型糖尿病合并高血压患者血清脂联素和改良稳态模型评估法计算的胰岛素抵抗指数的变化及相关性

目的探讨初诊的2型糖尿病合并高血压患者血清脂联素、改良稳态模型评估法计算的胰岛素抵抗指数(HOMA2-IR)的变化。方法收集正常对照组31人、初诊原发性高血压(HT组)41例、初诊2型糖尿病(DM组)46例、初诊2型糖尿病合并高血压(DMHT组)45例的资料,测定其血清脂联素、空腹血糖、空腹胰岛素(FINS)及其他各代谢指标,并计算HOMA2-IR。结果 DMHT组的HOMA2-IR高于DM组、HT组及正常对照组(3.49±2.01比2.10±1.33、1.53±0.65、0.66±0.19,均P0.01)。DMHT组的血清脂联素低于DM组、HT组及正常对照组[(2.24±0.87)比(2.82±1.24)、(3.74±1.50)和(5.59±1.95)mg/L,均P0.05]。Pearson相关分析表明,脂联素与HOMA2-IR、空腹血糖、体质量指数(BMI)、FINS、餐后血糖、糖化血红蛋白(HbA1c)、三酰甘油、收缩压、舒张压、脉压呈负相关(均P0.01)。多元逐步线性回归分析表明,BMI、餐后2h血糖、收缩压、三酰甘油、FINS、HbA1c和HOMA2-IR为血清脂联素的独立影响因素(P0.01)。结论 2型糖尿病合并高血压患者存在更严重的胰岛素抵抗和更低的脂联素水平。HOMA2-IR、血糖、血脂、血压、肥胖等因素与脂联素的变化密切相关。     

2型糖尿病合并高尿酸血症患者动脉粥样硬化的影响因素

目的研究2型糖尿病合并高尿酸血症(HUADM)患者颈动脉内膜中层厚度(IMT)与脂联素、C反应蛋白(CRP)的关系。方法选择2型糖尿病患者85例,按血尿酸水平分为:HUADM组43例、血尿酸正常糖尿病(NUADM)组42例,分析2组空腹血糖(FPG)、空腹胰岛素(FINS)、脂联素、CRP、糖化血红蛋白(HbA1c)及餐后2h血糖、餐后2h胰岛素,IMT,计算胰岛素抵抗指数(HOMA-IR),并且进行多元逐步回归分析。结果与NUADM组比较,HUADM组患者FPG、餐后2h血糖、FINS、餐后2h胰岛素、HbA1c、IMT、尿酸和lgHOMA-IR均明显升高,脂联素明显降低(P0.05,P0.01)。HUADM组患者IMT与HOMA-IR、TG、LDL-C和CRP呈正相关,与脂联素呈负相关。结论 HUADM患者存在更明显的代谢紊乱和胰岛素抵抗,且血清脂联素水平降低,CRP水平升高,提示更容易发生动脉粥样硬化。     

2型糖尿病患者血浆脂联素和抵抗素水平的测定及意义

为探讨2型糖尿病患者血浆脂联素和抵抗素水平的变化及意义。将60例2型糖尿病患者分为非肥胖糖尿病组30例(体质指数<25kg/m2)和肥胖糖尿病组30例(体质指数>25kg/m2);并选择28例健康者作对照。用酶联免疫吸附检测法测空腹血浆脂联素和抵抗素浓度;并测定各组的空腹血糖、胰岛素和血脂的水平;根据HOMA稳态模型提出的公式,计算胰岛素抵抗指数和胰岛素敏感指数,分析各指标间的相关性。结果发现,①糖尿病各组血浆脂联素的水平明显低于对照组,且肥胖糖尿病组低于非肥胖组,差异有显著性(P<0.01)。②糖尿病各组血浆抵抗素的水平明显高于对照组,而且肥胖糖尿病组明显高于非肥胖组,差异有显著性(P<0.01)。③相关分析发现,血浆脂联素浓度与体质指数、空腹血糖、胰岛素抵抗指数和甘油三酯呈显著负相关(分别为r=-0.55,P<0.01;r=-0.51,P<0.01;r=-0.52,P<0.01;r=-0.39,P<0.05),而与胰岛素敏感指数呈显著正相关(r=0.45,P<0.01);抵抗素则与体质指数、空腹血糖、胰岛素抵抗指数和甘油三酯呈显著正相关(r=0.40,P<0.01;r=0.52,P<0.01;r=0.46,P<0.01;r=0.27,P<0.05);与胰岛素敏感指数)呈显著负相关(r=-0.32,P<0.01)。此结果提示,脂联素和抵抗素都参与了胰岛素抵抗的发生过程,可能与2型糖尿病的糖脂代谢紊乱有关。     

2型糖尿病大血管病变与血清脂联素及C反应蛋白关系的研究

目的 探讨2型糖尿病患者血清脂联素及C反应蛋白水平与大血管病变的关系.方法 糖尿病患者63例,按颈动脉内膜中层厚度(CIMT)将其分为:CIMT≥1 mm者为A组;CIMT＜1 mm者为B组;健康体检者作为对照C组.分别检测身高、体重、血脂、血糖、空腹胰岛素、脂联素(APN)、C反应蛋白(CRP),计算体重指数及胰岛素抵抗指数(IRI),并进行统计学分析.结果 A组及B组血清APN水平低于C组(P<0.01),A组血清APN水平低于B组(P<0.01);A组及B组血清CRP水平高于C组(P<0.01),A组血清CRP水平高于B组(P<0.05).CIMT与APN、HDL呈显著负相关,与HOMA-IR、CRP呈显著正相关.进入回归方程的因素为CRP、APN、FBG、HDL、HOMA-IR.结论 血清APN水平降低、CRP水平升高是2型糖尿病患者颈动脉内膜增厚的主要危险因素,参与2型糖尿病大血管病变的发生和发展.     

老年腹型肥胖者血清脂联素和糖脂代谢与高血压的关系

目的研究老年腹型肥胖患者血清脂联素、血糖、血脂代谢与高血压的关系。方法对109例年龄≥60岁的腹型肥胖者,依据血压水平分为高血压组(67例)和非高血压组(42例),抽取空腹静脉血,检测血糖、血脂、胰岛素、脂联素、瘦素等。结果高血压组血清脂联素(0.93±0.21)nmol/L显著低于非高血压组[(1.10±0.33)nmol/L,P<0.05];而TG,游离脂肪酸(FFA),血糖(FBG),均显著高于非高血压组(P<0.05),HDL显著低于非高血压组(P<0.01),瘦素未见显著差异。高血压组患者脂联素与腰围、TG、FBG之间存在显著负相关(r=-0.314,-0.204,-0.261,P<0.05),与HDL呈正相关(r=0.227,P<0.05)。多元线性回归提示,非高血压组,腰围是影响脂联素水平的重要因素,高血压组,血压对脂联素有较独立的影响因素。结论脂联素水平对伴有腹型肥胖的老年高血压患者的发病具有重要作用。脂联素水平下降可能是原发性高血压伴有糖脂代谢异常的特征性指标之一。     

糖尿病微血管并发症与血清E-选择素关系探讨

目的研究2型糖尿病并发微血管病的老年患者血清可溶性E选择素(sE selectin,sE sel)水平的变化。方法应用酶联免疫吸附法(ELISA)测定153例2型糖尿病患者和30例健康对照者血清sE sel水平,并测定BMI、糖化血红蛋白(HbA1c)、空腹血糖、甘油三酯(TG)、胆固醇(TC)、BUN、UAER(尿白蛋白排出率)水平。结果所有糖尿病患者血清sE sel浓度均显著高于正常对照组(P<0.01);2型糖尿病有微血管病变组均高于无微血管病变组(均为P<0.05);sE sel水平与HbA1c呈正相关(r=0.61,P<0.05)。结论血清sE sel参与了老年糖尿病微血管病变的发病过程,是糖尿病视网膜病(DR)、糖尿病肾病(DN)的严重程度监测指标之一。     

血清脂联素在2型糖尿病合并冠心病中的临床价值

目的检测2型糖尿病合并冠心病患者血清脂联素并研究其临床价值。方法选择2型糖尿病合并冠心病患者(T2DM+CHD组)和正常健康人(CON组)为研究对象,检测并比较两组研究对象血清脂联素和常规生化指标差异,分析T2DM+CHD组患者血清脂联素与Gensini积分的相关性。结果 T2DM+CHD组2型糖尿病合并冠心病患者FBG、TC、TG、LDL和LP(a)均显著高于CON组正常健康人,而HDL和脂联素均显著低于CON组正常健康人,差异均具有统计学意义(P0.05)。将T2DM+CHD组2型糖尿病合并冠心病患者血清脂联素与Gensini积分进行相关性分析,表明脂联素和Gensini积分呈负相关(均rs=-0.533,P=0.031)。脂联素水平越低表示Gensini积分越高,冠状动脉病变越严重。结论血清脂联素与2型糖尿病合并冠心病发病紧密相关,可能在2型糖尿病合并冠心病病情及预后评估中具有一定临床价值。     

Serum adiponectin concentrations are not related to glycosylated hemoglobin levels (HbA1c) in obese diabetic and non-diabetic caucasians.

Although circulating adiponectin has been inversely correlated with obesity, type 2 diabetes and serum glycosylated hemoglobin (HbA1c) in humans, contradictory reports on that subject exist. In this study, serum concentrations of adiponectin in obese non-diabetic and diabetic humans were measured to examine whether they were associated with levels of HbA1c. The WHO definitions of obesity and diabetes were used. One hundred and five obese euglycemic subjects and 49 obese diabetics (aged 51+/-6.9, and 52+/-6.7 years, respectively) were studied. Their BMI, HbA1c and % of body fat were measured. Adiponectin was determined by an enzyme-linked immunosorbent assay. Although the serum adiponectin concentrations differed between diabetics and non-diabetics ( P<0.01), they were not correlated with HbA1c (r=-0.0814; P=0.5823, and r=-0.1861; P=0.1099, for diabetics and non-diabetics, respectively). Both diabetics and non-diabetics were segregated into tertiles according to their HbA1c levels. Plasma adiponectin did not differ significantly between the high (H), intermediate (I), and low (L) HbA1c tertiles. CONCLUSION: Concentrations of adiponectin were not correlated with levels of glycosylated hemoglobin in the diabetic and non-diabetic subjects examined.     

Are serum adiponectin concentrations in a population sample of 64‐year‐old Caucasian women with varying glucose tolerance associated with ultrasound‐assessed atherosclerosis?

OBJECTIVE: To examine whether serum adiponectin concentrations were associated with subclinical atherosclerosis assessed as intima media thickness (IMT) in the carotid arteries in Caucasian women with varying degrees of glucose tolerance. RESEARCH DESIGN AND METHODS: From a population-based cohort of 64-year-old Swedish women, 533 subjects with type 2 diabetes (DM2, n=177), impaired glucose tolerance (IGT; n=178) or normal glucose tolerance (NGT, n=178) were recruited. Anthropometrics, usual cardiovascular risk factors were examined and ultrasound examination of the carotid arteries was performed. RESULTS: Women with low adiponectin concentrations were characterized by thick IMT, higher prevalence of DM2, history of previous myocardial infarction, angina pectoris, anti-hypertensive treatment and high body mass index (BMI), waist circumference, plasma insulin, serum triglycerides, fasting glucose, HbA1c, and low serum HDL cholesterol levels. Carotid IMT correlated with HbA1c (r=0.24, P<0.001), waist circumference (r=0.22, P<0.001), plasma insulin (r=0.19, P<0.001), BMI (r=0.18, P<0.001), DM2 (r=0.16, P<0.001), systolic blood pressure (r=0.16, P<0.001), blood glucose (r=0.16, P<0.001), triglycerides (r=0.15, P<0.001), and reversely to adiponectin (r=-0.11, P=0.01), HDL cholesterol (r=-0.13, P=0.004), and alcohol intake (r=-0.087, P<0.05). A more detailed analysis of underlying associations was difficult due to a high co-linearity between these variable. CONCLUSIONS: Low serum adiponectin concentrations were associated with increased carotid artery IMT, and several risk factors for cardiovascular diseases, mainly those constituting the metabolic syndrome.     

2型糖尿病血清脂联素与心血管相关标志物相关性的研究

目的检测老年糖尿病(DM)患者血清脂联素(APN)与3个心血管相关标志物水平并探讨二者之间的相关关系。方法将70例老年受试者分为3组:正常对照组、老年DM未合并大血管病变组(DM1)和老年DM合并大血管病变组(DM2),检测血清APN与心血管相关标志物-血浆C反应蛋白(c-reactive protein,CRP)、Ⅰ型血浆纤溶酶原活化抑制剂(plasminogen activator inhibitor type-1,PAI-1)和血清基质金属蛋白酶-9(matrx metalloproteinase-9,MMP-9)的水平变化。结果从正常对照组、DM1到DM2组血清APN水平依次下降,各组间差别均具有显著意义(均P<0.01)从正常对照组、DM1到DM2组,CRP、PAI-1、MMP-9的水平逐渐升高,CRP、PAI-1升高在各组间均具有显著性(均P<0.05),MMP-9在DM2组开始出现显著升高(P<0.01),DM1组较正常对照组升高没有显著意义。APN水平与CRP、PAI-1、腰围、BMI、WHR及FBG、2h PBG、HbA1C、TG呈显著负相关。多元逐步回归分析显示APN与CRP(r2=0.18)、PAI-1(r2=0.16)、WHR(r2=0.21)及HbA1C(r2=0.19)具有高度的相关性(均P<0.05)结论APN可能是老年DM动脉粥样硬化发生发展中的保护因素。     

Leptin, triglycerides, and interleukin 6 are independently associated with C-reactive protein in Japanese type 2 diabetic patients

The aim of the present study was to investigate the factors contributing to the concentration of serum C-reactive protein in type 2 diabetic patients. One hundred and 48 Japanese type 2 diabetic patients were studied. In conjunction with C-reactive protein (CRP), BMI, systolic and diastolic blood pressure, glycosylated hemoglobin (HbA1c), fasting concentrations of plasma glucose, and serum lipids (triglycerides, HDL cholesterol, and total cholesterol), interleukin 6 (IL-6), and leptin were measured. Insulin resistance was also estimated by the insulin resistance index of homeostasis model assessment (HOMA-IR). With univariate analysis, serum CRP was positively correlated with BMI (r=0.281, P<0.001), diastolic blood pressure (r=0.176, P=0.048), triglycerides (r=0.293, P<0.001), HOMA-IR (r=0.294, P<0.001), IL-6 (r=0.323, P<0.001), and leptin (r=0.330, P<0.001), and negatively correlated with HDL cholesterol (r=-0.181, P=0.028). Multiple regression analyses showed that serum CRP was independently predicted by the level of IL-6 (P<0.001, F=4.04), leptin (P<0.001, F=7.09), and triglycerides (P<0.001, F=15.13), which explained 17.6% of the variability of serum CRP concentration in these patients. From these results, it can be concluded that along with IL-6 and triglycerides, leptin is another important independent factor that is associated with CRP in Japanese type 2 diabetic patients.     

Apolipoprotein E kinetics: influence of insulin resistance and type 2 diabetes

BACKGROUNDS AND AIMS: Insulin resistance related to obesity and diabetes is characterized by an increase in plasma TG-rich lipoprotein concentrations. Apolipoprotein (apo) E plays a crucial role in the metabolism of these lipoproteins and particularly in the hepatic clearance of their remnants. The aim of this study was to explore apoE kinetics of obese subjects and to determine what parameters could influence its metabolism. METHODS: Using stable-isotope labelling technique ([(2)H(3)]-leucine-primed constant infusion) and monocompartmental model (SAAM II computer software), we have studied the plasma kinetics of very-low-density lipoprotein (VLDL) and high-density lipoprotein (HDL) apoE in 12 obese subjects (body mass index (BMI) 27.4-36.6 kg/m(2)): Seven were type 2 diabetics (age 47-65 y; HbA1c 7.1-10.2%) and five were non-diabetics (age 40-51 y, HbA1c: 4.9-5.3%). Six of the diabetic subjects were insulin resistant as assessed by insulin sensitivity index (HOMA 2.6-10.0), while non-diabetic subjects were all insulin sensitive (HOMA 1.2-2.1). RESULTS: Plasma VLDL and HDL apoE concentrations were significantly higher in diabetic than in non-diabetic subjects (5.74+/-1.60 vs 1.46+/-1.74 mg/l, P<0.01 and 17.81+/-6.67 vs 9.97+/-3.32 mg/l, P<0.05). These increased levels were associated with significantly higher absolute production rate (APR) of VLDL and HDL apoE (0.714+/-0.343 vs 0.130+/-0.200 mg/kg/day, P<0.01, and 0.197+/-0.087 vs 0.080+/-0.060 mg/kg/day, P<0.05, respectively) while no significant difference was found for fractional catabolic rate (FCR) of VLDL and HDL apoE (3.44+/-1.64 vs 1.97+/-0.84/day and 0.30+/-0.12 vs 0.19+/-0.09/day, respectively). In the whole population, BMI was not correlated with any of apoE kinetic data. HOMA was positively correlated with FCR of VLDL apoE (r=0.64, P<0.05) and tended to be correlated with APR of VLDL apoE (r=0.58, P=0.06). HbA1c was positively correlated with APR and FCR of both VLDL apoE (r=0.91 and 0.78, P<0.01, respectively) and HDL apoE (r=0.66 and 0.69, P<0.05, respectively). CONCLUSION: Obese diabetics are characterized by elevated VLDL and HDL apoE levels associated with enhancement of VLDL and HDL apoE production rates. Whereas obesity did not influence apoE kinetic parameters in itself, insulin resistance may lead to an increase in VLDL apoE production and fractional catabolic rates. Diabetes and the glycemic control may also specifically influence the kinetics of both VLDL and HDL apoE. All together, these disorders should explain at least part of the increase in VLDL and HDL apoE observed in diabetes.     

Adiponectin and some inflammatory and endothelial markers in type-2 diabetes with and without cardiovascular disease

This study was designed to examine the association between adiponectin and C-reactive protein (CRP), interleukin-6 (IL-6) and endothelin-1, (ET-1) and their possible role in prediction of type-2 diabetes and development of diabetes and macrovascular complications. Forty subjects were studied. They were classified into four equal groups: Control, newly diagnosed type-2 diabetes, diabetics with old myocardial infarction (OMI) and acute myocardial infarction (AMI) groups. They were matched for body mass index (BMI), age, and sex. Adiponectin and IL-6 were determined by ELISA technique, CRP was determined by immunonephlometry and ET-1 was determined by radioimmunoassay. Adiponectin was found to be decreased in newly diagnosed diabetics (6.64 +/- 2.3 microg/ml), OMI (4.7 +/- 1.05 microg/ml) and AMI (4.23 +/- 0.73 microg/ml) when compared to controls (9.81 +/- 2.2 microg/ml), whereas CRP, IL- 6 and ET-1 were significantly elevated in AMI (18.6 +/- 5.3 mg/l, 12.6 +/- 4.2 pg/ml and 36.8 +/- 10.4 fmol/ml, respectively). The changes were marked in AMI group compared to other diabetic groups. Only adiponectin significantly decreased in newly diagnosed type-2 diabetics, but CRP, IL-6 and ET-1 did not significantly altered in newly diagnosed diabetics (4.9 +/- 1.6 mg/l, 6.9 +/- 2.3 pg/ml and 22.1 +/- 8.6 fmol/ml, respectively) compared to control. Adiponectin correlated negatively with CRP, IL-6 and ET-1, BMI and HbA1c, whereas inflammatory and vascular markers correlated positively with each other and with BMI and HbA1c. In conclusions, adiponectin may be implicated in the development of type-2 diabetes and macrovascular complications and can be used as an early predictor of type-2 diabetes. Whereas, none of the inflammatory and vascular markers can predict diabetes, but can be used as markers of acute vascular events and in follow up of these cases. Immunomodulation of adiponectin may help prevention and treatment of type-2 diabetes and its complications.     

绝经期2型糖尿病患者合并微量白蛋白尿对骨密度及25羟维生素D影响的观察

目的探讨绝经期T2DM患者合并微量白蛋白尿影响骨密度(BMD)及血25羟维生素D[25(OH)D]水平的相关性。方法选取2016年3月至2017年10月于本院内分泌科住院的绝经期T2DM患者89例,根据UACR分为单纯T2DM组(T2DM,n=56),合并微量白蛋白尿组(UAlb,n=33),比较两组生化指标、BMD及25(OH)D。结果两间25(OH)D、BMD比较,差异无统计学意义(P>0.05),UAlb组血钙低于T2DM组[(2.23±0.21)vs(2.29±0.13)mmol/L,P<0.05]。Pearson相关分析显示,BMD与BMI呈正相关(r=0.363,P<0.01),与年龄呈负相关(r=-0.380,P<0.01)。25(OH)D与FPG、HbA1c呈负相关(r=-0.228、-0.360,P<0.05或P<0.01)。多元线性回归分析结果显示,BMI、HbA1c是BMD的影响因素,HbA1c是25(OH)D的影响因素。结论绝经期T2DM患者合并微量白蛋白尿BMD、25(OH)D无明显降低。HbA1c水平升高可能引起BMD、25(OH)D降低。     

C-reactive protein and insulin resistance in non-obese Japanese type 2 diabetic patients

The aim of the present study was to investigate the relationship between C-reactive protein (CRP) and insulin resistance in non-obese Japanese type 2 diabetic patients. A total of 135 non-obese Japanese type 2 diabetic patients (96 men and 39 women, aged 36 to 83 years, with a body mass index [BMI] of 16.2 to 26.8 kg/m2) were studied. BMI, glycosylated hemoglobin (HbA(1c)), fasting concentrations of plasma glucose, serum lipids (triglycerides, low-density lipoprotein [LDL] cholesterol, high-density lipoprotein [HDL] cholesterol, and total cholesterol), CRP, and fibrinogen were measured. LDL cholesterol was calculated using the Friedewald formula. Insulin resistance was estimated by the insulin resistance index of homeostasis model assessment (HOMA-IR). Univariate regression analysis showed that CRP value was positively correlated to age (r = 0.218, P =.012), BMI (r = 0.239, P =.006), HOMA-IR (r = 0.397, P <.0001), triglycerides (r= 0.310, P <.005), LDL cholesterol (r= 0.179, P =.038), and fibrinogen (r = 0.371, P <.0001) levels and inversely correlated to HDL cholesterol (r = 0.174, P =.044) level in our diabetic patients. Multiple regression analysis showed that CRP was independently predicted by HOMA-IR (P<.0001, F = 11.6) and fibrinogen (P<.0001, F = 34.2), which explained 23.5% of the variability of CRP in our non-obese Japanese type 2 diabetic patients. These results indicate that insulin resistance and fibrinogen level are independent predictors of CRP in non-obese Japanese type 2 diabetic patients.     

Serum insulin-like growth factor-I is negatively associated with serum adiponectin in type 2 diabetes mellitus

Background

Although insulin-like growth factor-I (IGF-I) and dehydroepiandrosterone-sulfate (DHEA-S) are involved in age-related diseases such as cardiovascular disease and diabetes mellitus, the association of these hormones with serum adiponectin level is still unclear.

Objective and methods

To investigate the association between serum IGF-I and DHEA-S versus adiponectin, we conducted a cross-sectional study of 348 Japanese men with type 2 diabetes mellitus and examined their relationships. Serum total adiponectin level was measured by an ELISA kit.

Results

Simple correlation analysis showed that patients' age and duration of diabetes were negatively correlated with IGF-I and DHEA-S (p < 0.01) and positively with adiponectin (p < 0.01), while body mass index (BMI) was positively correlated with IGF-I and DHEA-S (p < 0.001) and negatively with adiponectin (p < 0.001). IGF-I was negatively correlated with adiponectin (r = − 0.25, p < 0.001) and DHEA-S was negatively correlated with adiponectin and HbA1c (r = − 0.17, p = 0.003 and r = − 0.12, p = 0.027, respectively). In multiple regression analysis adjusted for age, duration of diabetes, BMI, and serum creatinine, HbA1c was negatively associated with IGF-I and DHEA-S (β = − 0.12, p = 0.036 and β = − 0.22, p < 0.001, respectively). Adiponectin was negatively associated with IGF-I (β = − 0.15, p = 0.013), but not DHEA-S. Moreover, this association was still significant after additional adjustment for HbA1c (β = − 0.18, p = 0.005).

Conclusions

Present cross-sectional study for the first time showed a negative association of serum IGF-I with serum adiponectin in Japanese men with type 2 diabetes independent of age, duration of diabetes, BMI, renal function, and HbA1c.     

Adiponectin is independently associated with glycosylated haemoglobin

BACKGROUND: In humans, adiponectin has been demonstrated to circulate in inverse proportion to the degree of insulin resistance. OBJECTIVE: To investigate the association between adiponectin and glycosylated haemoglobin (HbA1c) in a population-based study. DESIGN AND METHODS: Two hundred and ninety-seven individuals aged 30-75 years were enrolled in a cross-sectional study. They included patients with type 2 (non-insulin-dependent) diabetes mellitus and stable, good metabolic control (n=32) and individuals with glucose intolerance (n=54). Adiponectin was measured using a sandwich enzyme-linked immunosorbent assay (intra-assay and interassay coefficients of variation 3.3 and 7.4% respectively). RESULTS: Adiponectin correlated with age (r=0.161; P=0.006), body mass index (r=-0.197; P=0.001), diastolic blood pressure (r=-0.181; P=0.005), fasting glucose and HbA1c (r=-0.251 and r=-0.22 respectively; P<0.0001), high-density lipoprotein cholesterol (r=0.442; P<0.001) and serum triglycerides (r=-362; P<0.001). In multiple regression analysis, sex, age, fasting and post-load glucose, and adiponectin independently contributed to 40% of the variance in HbA1c. Among individuals with normal glucose tolerance, fasting glucose (P=0.0033), post-load glucose (P=0.0015), age (P=0.001) and adiponectin (P=0.0083) independently contributed to 21% of the variance in HbA1c. CONCLUSION: Adiponectin is significantly associated with altered glucose metabolism and independently contributes to the variance of HbA1c in a population-based manner.