Abstract
IntroductionMelatonin is a pineal hormone under the control of the biological clock, which is located in the hypothalamus and regulated by light exposure. Melatonin receptors have been found throughout the body in many tissues including pancreatic islet cells, reflecting the widespread effects of melatonin on physiological functions such as energy metabolism and the regulation of body weight. Several lines of evidence suggest that melatonin may play a role in glucose metabolism.Aim of the workTo investigate the association between diabetes mellitus (T2D) and the variants rs10830963 in the melatonin receptor 1B gene (MTNR1B) locus in a sample of the Egyptian population.Patients and methodThis was a case–control study conducted in the internal medicine department at El-Kasr El-Aini Hospital, Cairo University.It included 30 diabetic individuals (type 2) compared with 20 healthy individuals. All individuals included in the study were subjected to a detailed history taking, complete physical examination, body composition evaluation, and laboratory testing including blood picture, blood urea nitrogen, creatinine, lipid profile, and genotyping of melatonin receptor B1. Diabetic individuals were subtyped into three groups: (a) Diabetic patients without complications. (b) Diabetic patients with microvascular complications. (c) Diabetic patients with macrovascular complications.ResultsStatistical analysis revealed a significant positive correlation between the MTNR1B polymorphism rs10830963 and glucose levels in type 2 diabetes.ConclusionThe study confirmed that individuals having the MTNR1B gene polymorphism are at a greater risk of developing type 2 diabetes and having higher blood glucose levels and are more prone to be dyslipidemic than others who have no polymorphism.
Highlights
Melatonin is a pineal hormone under the control of the biological clock, which is located in the hypothalamus and regulated by light exposure
Reduced activity of AA-NAT has been documented in type 2 diabetic rats, so that the immediate precursor of melatonin is likewise synthesized more slowly [16]. Patients and methods This was a case–control study conducted to evaluate the association between the melatonin receptor 1B gene (MTNR1B) polymorphism rs10830963 and glucose levels in type 2 diabetes
The study group included 30 patients with type 2 diabetes admitted at the El-Kasr El-Ainy university hospital internal medicine department, for assessing the presence of the polymorphism in the melatonin receptor 1B gene, compared with 20 healthy nondiabetic individuals as the control group
Summary
Melatonin is a pineal hormone under the control of the biological clock, which is located in the hypothalamus and regulated by light exposure. Melatonin receptors have been found throughout the body in many tissues including pancreatic islet cells, reflecting the widespread effects of melatonin on physiological functions such as energy metabolism and the regulation of body weight. Aim of the work To investigate the association between diabetes mellitus (T2D) and the variants rs10830963 in the melatonin receptor 1B gene (MTNR1B) locus in a sample of the Egyptian population. Patients and method This was a case–control study conducted in the internal medicine department at El-Kasr ElAini Hospital, Cairo University. It was shown that melatonin inhibits the insulin secretion of pancreatic b-cells. The hypothesis that melatonin has a regulatory influence on the pancreatic b-cell has been strengthened by the detection of two melatonin receptors, MT1 and MT2 [7], in wholetissue examinations of the pancreas in rats and humans [8]
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