Glucose-Induced Insulin Secretion Is Impaired and Insulin-Induced Phosphorylation of the Insulin Receptor and Insulin Receptor Substrate-1 Are Increased in Protein-Deficient Rats

1997 ◽  
Vol 127 (3) ◽  
pp. 403-410 ◽  
Author(s):  
Marise A. B. Reis ◽  
Everardo M. Carneiro ◽  
Maria A. R. Mello ◽  
A. Carlos Boschero ◽  
Mario J. A. Saad ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Insulin Receptor ◽  
Insulin Receptor Substrate ◽  
Insulin Receptor Substrate 1

Echinops Spp. Polysaccharide B Ameliorates Metabolic Abnormalities in a Rat Model of Type 2 Diabetes Mellitus

2020 ◽  
Vol 19 (1) ◽  
pp. 106-114
Author(s):  
Guang Hao ◽  
Xiaoyu Ma ◽  
Mengru Jiang ◽  
Zhenzhen Gao ◽  
Ying Yang
Keyword(s):  
Diabetes Mellitus ◽  
Insulin Resistance ◽  
Type 2 Diabetes ◽  
Type 2 Diabetes Mellitus ◽  
Insulin Secretion ◽  
Insulin Receptor ◽  
Skeletal Muscles ◽  
Insulin Receptor Substrate ◽  
Sprague Dawley

This study examined the in vivo effects of Echinops spp. polysaccharide B on type 2 diabetes mellitus in Sprague-Dawley rats. We constructed a type 2 diabetes mellitus Sprague-Dawley rat models by feeding a high-fat and high-sugar diet plus intraperitoneal injection of a small dose of streptozotocin. Using this diabetic rat model, different doses of Echinops polysaccharide B were administered orally for seven weeks. Groups receiving Xiaoke pill and metformin served as positive controls. The results showed that Echinops polysaccharide B treatment normalized the weight and blood sugar levels in the type 2 diabetes mellitus rats, increased muscle and liver glycogen content, improved glucose tolerance, increased insulin secretion, and reduced glucagon and insulin resistance indices. More importantly, Echinops polysaccharide B treatment upregulated the expression of insulin receptor in the liver, skeletal muscles, and pancreas, and significantly improved the expression levels of insulin receptor substrate-2 protein in the liver and pancreas, as well as it increased insulin receptor substrate-1 expression in skeletal muscles. These two proteins play crucial roles in increasing insulin secretion and in controlling type 2 diabetes mellitus. The findings of the present study suggest that Echinops polysaccharide B could improve the status of diabetes in type 2 diabetes mellitus rats, which may be achieved by improving insulin resistance. Our study provides a new insight into the development of a natural drug for the control of type 2 diabetes mellitus.

The Association between Maternal/Fetal Insulin Receptor Substrate 1 Gene Polymorphism rs1801278 and Gestational Diabetes Mellitus in a Chinese Population

2021 ◽  
pp. 1-8
Author(s):  
Lingling Wu ◽  
Changping Fang ◽  
Jun Zhang ◽  
Yanchou Ye ◽  
Haiyan Zhao
Keyword(s):  
Diabetes Mellitus ◽  
Gestational Diabetes ◽  
Gene Polymorphism ◽  
Gestational Diabetes Mellitus ◽  
Insulin Receptor ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Insulin Receptor Substrate ◽  
Single Center ◽  
Insulin Receptor Substrate 1

<b><i>Objectives:</i></b> Insulin receptor substrate 1 (IRS1) is a crucial factor in the insulin signaling pathway. IRS1 gene polymorphism rs1801278 in mothers has been reported to be associated with gestational diabetes mellitus (GDM). However, it is not clear whether IRS1 gene polymorphism rs1801278 in fetuses is associated with their mothers’ GDM morbidity. The purpose of this study is to analyze the association between maternal, fetal, or maternal/fetal <i>IRS1</i> gene polymorphism rs1801278 and GDM risk. <b><i>Design:</i></b> The study was a single-center, prospective cohort study. In total, 213 pairs of GDM mothers/fetuses and 191 pairs of control mothers/fetuses were included in this study. They were recruited after they underwent oral glucose tolerance test during 24–28 weeks of gestation and followed up until delivery. All participants received the conventional interventions (diet and exercise), and no special therapy except routine treatment. <b><i>Methods:</i></b> A total of 213 pairs of GDM mothers/fetuses and 191 pairs of normal blood glucose pregnant mothers/fetuses were ge­notyped using PCR and DNA sequencing from January 2015 to September 2016. Maternal/fetal <i>IRS1</i> gene polymorphism rs1801278 was analyzed and compared between 2 groups. <b><i>Results:</i></b> There were no significant differences in the frequency of individual mothers’ or fetuses’ <i>IRS1</i> rs1801278 polymorphisms between 2 groups; if both the mothers and fetuses carried A allele, significantly lower GDM morbidity was observed in the mothers. <b><i>Limitations:</i></b> The sample size was relatively small as a single-center study. <b><i>Conclusions:</i></b> Our study suggested that maternal/fetal rs1801278 polymorphism of <i>IRS1</i> is a modulating factor in GDM; both mothers/fetuses carrying the A allele of rs1801278 may protect the mothers against the development of GDM.

scholarly journals Gly972Arg Variant of Insulin Receptor Substrate 1 Gene and Colorectal Cancer Risk in Overweight/Obese Subjects

2016 ◽  
Vol 31 (1) ◽  
pp. 68-72 ◽  
Author(s):  
Touraj Mahmoudi ◽  
Keivan Majidzadeh-A ◽  
Khatoon Karimi ◽  
Hamid Farahani ◽  
Reza Dabiri ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Insulin Receptor ◽  
Case Control Study ◽  
Insulin Receptor Substrate ◽  
Protective Effects ◽  
Insulin Receptor Substrate 1 ◽  
Pcr Rflp ◽  
Obese Subjects ◽  
Control Study

Background Given the major role of obesity and insulin resistance (IR) in colorectal cancer (CRC), we investigated whether genetic variants in ghrelin ( GHRL), resistin ( RETN) and insulin receptor substrate 1 ( IRS1) were associated with CRC risk. Methods This study was conducted as a case-control study, and 750 subjects, including 438 controls and 312 patients with CRC, were enrolled and genotyped using the PCR-RFLP method. Results No significant differences were observed for GHRL (rs696217), RETN (rs3745367) and IRS1 (rs1801278, Gly972Arg or G972R) gene variants between the cases and controls. However, the IRS1 G972R R allele compared with the G allele and the G972R RR+GR genotype compared with the GG genotype appeared to be markers of decreased CRC susceptibility in the overweight/obese subjects (p = 0.024; odds ratio [OR] = 0.42, 95% confidence interval [95% CI], 0.20-0.91; and p = 0.048; OR = 0.42, 95% CI, 0.17-0.99, respectively). Furthermore, the R allele and RR+GR genotype were also associated with decreased risks for obesity in the patients with CRC (p = 0.007; OR = 0.35, 95% CI, 0.15-0.77; and p = 0.015; OR = 0.35, 95% CI, 0.15-0.72, respectively). Conclusions In accordance with previous studies, our findings suggest that the IRS1 G972R R allele and RR+GR genotype have protective effects for CRC in overweight/obese patients and for obesity in patients with CRC. Nevertheless, further studies are required to confirm these findings.

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