Abstract
The relationship between the rs2302382, rs8111428 and Glu354Gln (rs1800437) polymorphisms in the GIPR (glucose-dependent insulinotropic polypeptide receptor) gene and plasma levels of mediators involved in the regulation of carbohydrate metabolism has been investigated in obese patients with type 2 diabetes mellitus (T2DM) before and after test breakfast. The contribution of the polymorphic variants of rs2302382, rs8111428 in the GIPR gene contributed to T2DM genetic predisposition in Russian individuals belonging to the Slavic population. Polymorphisms rs2302382 and rs8111428 in the GIPR gene were characterized by the linkage disequilibrium. The decrease in the expression level of the GIPR gene in mesenteric adipose tissue of the small intestine in the carriers of the CC genotype rs2302382 and AA rs8111428 was associated with the increase in the plasma leptin level, whereas during its normal expression, the plasma content of insulin, and GIP (in persons with the CA genotype of the polymorphism rs2302382 and AG polymorphism rs8111428), resistin and ghrelin (in individuals with the CA genotype of the polymorphism rs2302382) increased. We propose the stimulating effect of GIP on the secretion of resistin, leptin and ghrelin, with an increase in insulin production in obese patients with T2DM.
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