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The present study explores the molecular mechanism of anti-obesity effect of total lutein oxidized products (LOPs) in high-fat diet-induced obese C57BL/6 mice. Total LOPs (50, 100, 200 mg/kg b.wt.) were intubated for 22 weeks. Lipid profile, peroxides, AST, ALT, GST activities, lipid metabolizing enzymes/molecules, 3T3-L1 cell differentiation, TGF-β1 and p38 MAPK expressions were studied. Total LOPs at 100 mg/kg b.wt. reduced plasma and hepatic cholesterol, triglycerides, phospholipids, ALT and AST activities. FAS and CPT activities were inhibited in the liver homogenate, and epididymal WAT (eWAT). Total LOPs at 200 mg/kg b.wt. reduced HMGCoA:Mevalonate in eWAT, lipid peroxides in eWAT and liver. GST activity was high in the liver and eWAT. Total LOPs (100μg/ml) suppressed adipogenesis and decreased the accumulation of lipid droplets from two to eight days. Adiponectin was upregulated, PPAR γ, lipoprotein lipase, TGF-β1, and p38 MAPK were down-regulated. The results have shown that total LOPs are potent anti-obese molecules. ABBREVIATIONS:  AIN 93G: American institute of nutrition 93 for growth; ALT: alanine transaminase; AST: aspartate transaminase; CEBPα: ccaat/enhancer binding protein α; C-DNA: complementary deoxyribonucleic acid; CPT: carnitine palmitoyl transferase; GST: glutathione-S-transferase; ELISA: enzyme-linked immune sorbent assay; FAS: fatty acid synthase; HDL: high-density lipoprotein; HFD: high-fat diet; HMG CoA: β-Hydroxy β-methylglutaryl-Coenzyme A; LDL: low-density lipoprotein; LOPs: total lutein oxidized products; LPL: lipoprotein lipase; MDA-Malonaldehyde; MTT: 3-(4,5-dimethylthiazol-2-yl)−2,5-diphenyl tetrazolium bromide; MVA: mevalonate; p38MAPK: p38 mitogen-activated protein kinases; RNA: ribonucleic acid; RTq-PCR: quantitative reverse transcription polymerase chain reaction; PPAR-γ: peroxisome proliferator-activated receptor-gamma; TGF-β1: transforming growth factor beta 1; WAT: white adipose tissue.

Molecular mechanism of anti-obesity effect of total lutein oxidized products (LOPs) in diet-induced obese mice