RESUMO
Satiety peptides convey information about short-term energy reserves in the gut to the hypothalamus and aid in regulation of appetite and food intake. Obestatin is one such gastro peptide that has been shown to upregulate glycerolipid metabolism and PPARγ signalling. Obestatin brings about moderate reduction in circulating and stored triglyceride levels and reduction in gain in body weight in mice. We wanted to test whether obestatin could be further potentiated by co-administration with nutraceuticals genistein and capsaicin that are well known to reduce triglyceride levels. Hence, we chose to administer the compounds individually and pair-wise with obestatin in 3T3-L1 cells at concentrations of 200 nM obestatin, 10 µM capsaicin and 100 µM genistein. When treated along with induction of differentiation, both capsaicin and genistein in combination with obestatin reduced triglyceride levels in 3T3-L1 cells by 25 and 20%, respectively, when accessed on day 14 after induction. The combined administrations were dominated by the effect of the nutraceuticals and showed the same effect as of capsaicin or genistein. Upregulation of Fatty acid synthase (Fasn) and Adipose triglyceride lipase (Atgl/Pnpla2) by obestatin were reversed by both capsaicin and genistein. However, their ability to upregulate Peroxisome proliferation activating receptor gamma (Pparγ), Hormone sensitive lipase (Hsl), Lipoprotein lipase (Lpl) were retained while upregulation of Uncoupling protein 1 (Ucp1) by capsaicin was unchanged upon co-administration. Over expression of the lipases and UCP1 in case of capsaicin could be resulting in net lowering of lipid accumulation in the cells.
