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      Activation of PPAR gamma and alpha by punicic acid ameliorates glucose tolerance and suppresses obesity-related inflammation.

      Journal of the American College of Nutrition
      3T3 Cells, Adipose Tissue, drug effects, metabolism, Animals, Anti-Inflammatory Agents, pharmacology, therapeutic use, Blood Glucose, Disease Models, Animal, Dose-Response Relationship, Drug, Gene Expression, Glucose Intolerance, drug therapy, Humans, Hypoglycemic Agents, Linolenic Acids, Mice, Mice, Knockout, Muscle, Skeletal, NF-kappa B, Obesity, PPAR alpha, agonists, genetics, PPAR gamma, Phytotherapy, Plant Oils, Punicaceae, chemistry, Seeds, Tumor Necrosis Factor-alpha

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          Abstract

          Peroxisome proliferator-activated receptor gamma (PPAR gamma) is the molecular target for thiazolidinediones (TZDs), a class of synthetic antidiabetic agents. However, the naturally occurring agonists of PPARs remain largely unknown. Punicic acid (PUA) is a conjugated linolenic acid isomer found in pomegrante. The objective of this study was to test the hypothesis that PUA activates PPAR gamma and thereby ameliorates glucose homeostasis and obesity-related inflammation. The ability of PUA to modulate PPAR reporter activity was determined in 3T3-L1 pre-adipocytes. A cell-free assay was used to measure PUA's binding to the ligand-binding domain (LBD) of human PPAR gamma. The preventive actions of PUA were investigated using genetically obese db/db mice and a model of diet-induced obesity in PPAR gamma-expressing and tissue-specific PPAR gamma null mice. Expression of PPAR alpha, gamma, PPAR-responsive genes and TNF-alpha was measured in tissues controlling glucose homeostasis. PUA caused a dose-dependent increase PPAR alpha and gamma reporter activity in 3T3-L1 cells and bound although weakly to the LBD of human PPAR gamma. Dietary PUA decreased fasting plasma glucose concentrations, improved the glucose-normalizing ability, suppressed NF-kappaB activation, TNF-alpha expression and upregulated PPAR alpha- and gamma-responsive genes in skeletal muscle and adipose tissue. Loss of PPAR gamma impaired the ability of dietary PUA to improve glucose homeostasis and suppress inflammation. Our studies demonstrate that PUA binds and robustly activates PPAR gamma, increases PPAR gamma-responsive gene expression and the loss of PPAR gamma in immune cells impairs its ability to ameliorate diabetes and inflammation.

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