Efeito de proteínas bioativas isoladas do tamarindo secretagogas da CCK e seu sinergismo com leptina em ratos wistar obesos

Abstract

Obesity is a worldwide epidemic that can occur due to genetic, environmental and metabolic / hormonal factors. Among the hormonal factors, it is seen that, humans or animals, in state of obesity, present altered responses to certain hormones when compared to eutrophic. Once obesity presents multifactorial causes, its treatment also occurs by several means, among which the use of trypsin inhibitors. This study evaluated the effect of a Tamarindus indica L. seed isolated Trypsin Inhibitor (TTI) as a CCK secretagogue and its synergism with leptin in obese Wistar rats. The study was conducted with obese and lean rats (n = 20). Three groups of obese rats were feed 10 days one of the following diets: Standard diet (Labina®) + water; High Glycemic Index and Load (HGLI) diet + water or HGLI diet + TTI. Lean animals were fed the Labina® for the 10 days. We evaluated nutritional status (zoometric measurements), plasma CCK and leptin, mRNA expression of intestinal CCK-related genes and the ob gene in subcutaneous adipose tissue. TTI treated animals had a slight reduction in the Lee index. TTI did not increase plasma CCK in obese animals and we found no significant effect of TTI in CCK-2R and PCSK1 gene expression. On the other hand, TTI treatment increased CCK-1R gene expression compared with the lean group (p = 0.028). Although TTI did not reduce the ob gene expression. Interestingly 60% of the TTI treated animals presented plasma concentrations below 0.1 ng / μL, whereas those treated with standard diet, only 20% of the animals were in this condition. This was not observed in the lean and obese groups. Our study with relative mRNA expression of intestinal CCK-related genes in obese rats is a novel study and suggests that TTI by decreasing plasma leptin may improve CCK action in obese rats, since the expression of the CCK-1R gene in this group was higher when compared to lean rats, resulting in improvement of zoometric measurements, independently of plasma CCK increase.