Association between Low-density Lipoprotein Receptor-related Protein 5 Polymorphisms and Type 2 Diabetes Mellitus in Han Chinese:a Case-control Study

Objective To investigate the association between low-density lipoprotein receptor-related protein 5 （LRPS） variants （rs12363572 and rs4930588） and type 2 diabetes mellitus （T2DM） in Han Chinese. Methods A total of 1842 T2DM cases （507 newly diagnosed cases and 1335 previously diagnosed cases） and 7777 controls were included in this case-control study. PCR-RFLP was conducted to detect the genotype of the two single nucleotide polymorphisms （SNPs）. Odds ratios （ORs） and 95% confidence intervals （95% CIs） were calculated to describe the strength of the association by logistic regression. Results In the study subjects, neither rs12363572 nor rs4930588 was significantly associated with T2DM, even after adjusting for relevant covariates. When stratified by body mass index （BMI）, the two SNPs were also not associated with T2DM. Among the 3 common haplotypes, only haplotype ~ was associated with reduced risk of T2DM （OR 0.820, 95% CI 0.732-0.919）. In addition, rs12363572 was associated with BMI （P〈0.001） and rs4930588 was associated with triglyceride levels （P=0.043） in 507 newly diagnosed T2DM cases but not in healthy controls. Conclusion No LRP5 variant was found to be associated with T2DM in Han Chinese, but haplotype TT was found to be associated with T2DM.

Association of TCF7L2 and GCG Gene Variants with Insulin Secretion,Insulin Resistance,and Obesity in New-onset Diabetes

This cohort study was designed to evaluate the association of transcription factor 7-like 2 （TCF7L2） and proglucagon gene （GCG） variants with disordered glucose metabolism and the incidence of type 2 diabetes mellitus （T2DM） in a rural adult Chinese population. A total of 7,751 non-T2DM participants 〉18 years old genotyped at baseline were recruited. The same questionnaire interview and physical and blood biochemical examinations were performed at both baseline and follow-up. During a median 6 years of follow-up, T2DM developed in 227 participants. After adjustment for potential contributory factors, nominally significant associations were seen between 3T genotype and the recessive model of TCFTI.2 rs7903146 and increased risk of T2DM [hazard ratio （HR）=4.068, 95% confidence interval （CI）： 1.270-13.026; HR=4.051, 95% CI： 1.268-12.946, respectively]. The TT genotype of rs7903146 was also significantly associated with higher fasting plasma insulin level and the homeostasis model assessment of insulin resistance in case of new-onset diabetes. In addition, the TCF7L2 rs290487 TT genotype was associated with abdominal obesity and the GCG rs12104705 CC genotype was associated with both general obesity and abdominal obesity in case of new-onset diabetes.

低氧状态下红景天通过上调缺氧诱导因子1α促进人脐静脉内皮细胞肾上腺髓质素及其受体的表达

目的探讨低氧状态下红景天对人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)中肾上腺髓质素(adrenomedullin,ADM)、降钙素受体样受体(calcitonin receptor-like receptor,CRLR)、缺氧诱导因子1α(hypoxia-inducible factor 1 alpha,HIF-1α)表达的影响以及这一过程中HIF-1α的调控作用。方法 HUVECs常规培养并设立正常氧、低氧对照组和低氧红景天组。CCK8法观察低氧状态不同浓度红景天干预不同时间的促细胞增殖作用;实时定量PCR和Western blot法测定ADM、CRLR、HIF-1α基因表达的情况;通过小干扰RNA方法敲低HIF-1α基因,实时定量PCR和Western blot法检测ADM、CRLR基因表达的变化。结果红景天促进低氧状态下HUVECs增殖,促进低氧状态下内皮细胞ADM、CRLR以及HIF-1α的表达,HIF-1αsiRNA可以显著抑制红景天对ADM及CRLR表达的促进作用。结论低氧状态下红景天通过上调HIF-1α促进HUVECs ADM及其受体CRLR的表达。