Abstract
To assess the effects of peroxisome proliferator-activated receptor (PPAR) agonists on glucose tolerance and hepatic lipid metabolism in diet-induced obese mice. Male C57BL/6 mice received a standard chow diet (SC, 10% energy as lipids) or high-fat diet (HF, 50% energy as lipids) for 10 weeks, after which treatment was initiated, forming the groups: SC group, HF group, HF-BZ group (HF + bezafibrate, pan-PPAR agonist), HF-WY group (HF + WY-14643, PPARalpha agonist) and HF-GW group (HF + GW1929, PPARgamma agonist). Treatments lasted for four weeks. Insulin resistance and liver remodeling were evaluated by biochemical and molecular approaches. The HF and HF-GW mice were overweight. Conversely, the HF-BZ and HF-WY mice presented with body masses equal to those of the SC mice. All treatments restored insulin sensitivity and blood lipid and adiponectin levels. Hepatic steatosis was prevented in the HF-WY and HF-BZ mice as shown by the elevated mRNA levels of PPARalpha and Carnitine palmitoyl transferase-1a in both groups, which favored enhanced beta-oxidation. Marked decreases in liver triacylglycerol levels confirmed these findings. In contrast, the HF-GW mice exhibited increased PPARgamma and fatty acid translocase/CD136 mRNA level...Continue Reading
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