title: Evaluation of hypocholesterolemic effect of oleuropein in cholesterol-fed rats.
abstract: Oleuropein, which is the major compound of olive leaves, has been reported to exert several pharmacological properties, including anti-cancer, antidiabetic and anti-atherosclerotic activities. The objective of this study was to evaluate the effect of oleuropein on adiponectin level in high cholesterol diet (HCD) induced obesity in rat and the molecular mechanism underlying its activation. Our results showed that orally administered oleuropein (50 mg/kg) by gavage for 8 weeks decreased the body weight, adipose tissue mass and triglyceride and attenuated steatosis in liver. Moreover, the effect of oleuropein on adiponectin, an important hormone with fatty-acid oxidation properties, was evaluated and our data illustrated that oleuropein supplementation increased serum adiponectin concentration. The effects of oleuropein on protein expression related to lipogenic genes were investigated and our results showed that its administration significantly inhibited peroxisome proliferator-activated receptor γ (PPARγ), sterol regulatory element-binding protein-1c (SREBP-1c) and fatty-acid synthase (FAS). In addition, oleuropein stimulated the HCD-induced inhibition of AMP-activated protein kinase (AMPK) in epididymal adipose tissues. These results suggest that oleuropein exerts anti-obesity effects in HCD rats by activating AMPK and suppressing PPAR γ (Peroxisome proliferator-activated receptor γ) expression in adipose tissues. These data provide that oleuropein has important implications for preventing obesity.
authors.affiliation: Environmental Bioprocesses Laboratory, Laboratoire mixte international (LMI-COSYS-MED), Sfax Biotechnology Center, P.O. Box 1177, Sfax, 3038, Tunisia.
authors.forename: Fatma
authors.initials: F
authors.lastname: Hadrich
authors.affiliation: Environmental Bioprocesses Laboratory, Laboratoire mixte international (LMI-COSYS-MED), Sfax Biotechnology Center, P.O. Box 1177, Sfax, 3038, Tunisia.
authors.forename: Asma
authors.initials: A
authors.lastname: Mahmoudi
authors.affiliation: Environmental Bioprocesses Laboratory, Laboratoire mixte international (LMI-COSYS-MED), Sfax Biotechnology Center, P.O. Box 1177, Sfax, 3038, Tunisia.
authors.forename: Zouhaier
authors.initials: Z
authors.lastname: Bouallagui
authors.affiliation: Environmental Bioprocesses Laboratory, Laboratoire mixte international (LMI-COSYS-MED), Sfax Biotechnology Center, P.O. Box 1177, Sfax, 3038, Tunisia.
authors.forename: Ines
authors.initials: I
authors.lastname: Feki
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Isoda
authors.affiliation: INSERM UMR S938, Centre de Recherche Saint-Antoine, F-75012, Paris, France.
authors.forename: Bruno
authors.initials: B
authors.lastname: Feve
authors.affiliation: Environmental Bioprocesses Laboratory, Laboratoire mixte international (LMI-COSYS-MED), Sfax Biotechnology Center, P.O. Box 1177, Sfax, 3038, Tunisia. Electronic address: sami.sayadi@cbs.rnrt.tn.
authors.forename: Sami
authors.initials: S
authors.lastname: Sayadi
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000378:metabolism; D052242:Adiponectin / Q000097:blood* / Q000378:metabolism; D000818:Animals; D019440:Anti-Obesity Agents / Q000627:therapeutic use*; D000924:Anticholesteremic Agents / Q000627:therapeutic use*; D002784:Cholesterol / Q000008:administration & dosage / Q000378:metabolism*; D004789:Enzyme Activation / Q000187:drug effects; D057888:Iridoid Glucosides; D039823:Iridoids / Q000627:therapeutic use*; D050356:Lipid Metabolism / Q000187:drug effects; D008055:Lipids / Q000097:blood; D008297:Male; D009765:Obesity / Q000097:blood* / Q000188:drug therapy* / Q000209:etiology / Q000378:metabolism; D047495:PPAR gamma / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D051780:Sterol Regulatory Element Binding Protein 1 / Q000378:metabolism
chemical_list: D052242:Adiponectin; D019440:Anti-Obesity Agents; D000924:Anticholesteremic Agents; D057888:Iridoid Glucosides; D039823:Iridoids; D008055:Lipids; D047495:PPAR gamma; D051780:Sterol Regulatory Element Binding Protein 1; C002769:oleuropein; D002784:Cholesterol; D055372:AMP-Activated Protein Kinases
keywords: AMPK; Adiponectin; Fatty acid synthase; Oleuropein; PPAR γ