Oleuropein aglycone enhances UCP1 expression in brown adipose tissue in high-fat-diet-induced obese rats by activating β-adrenergic signaling |
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| Institution: | 1. Laboratory of Nutrition Chemistry, Faculty of Home Economics, Kobe Women''s University, Suma, Kobe, Japan;2. Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, Shimotsuke, Tochigi, Japan;3. School of Food and Nutritional Sciences, University of Shizuoka, Suruga, Shizuoka, Japan;4. Laboratory of Molecular Function of Food, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto, Japan;5. J-Oil Mills Inc., Yokohama, Kanagawa, Japan;1. Environmental Bioprocesses Laboratory, Laboratoire Mixte International (LMI-COSYS-MED), Sfax Biotechnology Center, P.O. Box 1177, Sfax 3038, Tunisia.;2. INSERM UMR S938, Centre de Recherche Saint-Antoine, F-75012 Paris, France;3. Alliance for Research on North Africa (ARENA), University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan;4. Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan;1. Laboratoire des Méthodes et Techniques Analytiques, Institut National de Recherche et d''Analyse Physico-chimique (INRAP), Biotechpole de Sidi Thabet, Ariana 2020, Tunisia;2. Institut des Sciences Analytiques, Département Service Central d''Analyse, 5 rue de la Doua, Villeurbanne, 69100 Lyon, France;3. Laboratoire des Substances Naturelles, Institut National de Recherche et d''Analyse Physico-chimique (INRAP), Biotechpole de Sidi Thabet, Ariana 2020, Tunisia |
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| Abstract: | Oleuropein is the pungent principle of raw olives. Oleuropein aglycone (OA) is a major phenolic compound in extra virgin olive oil and the absorbed form of oleuropein. We aimed to determine the mechanism underlying the nutritional effects of oleuropein and OA on interscapular brown adipose tissue (IBAT) in rats with high-fat (HF) diet-induced obesity by examining the agonistic activity of oleuropein and OA toward the transient receptor potential ankyrin 1 (TRPA1) and vanilloid 1 (TRPV1). Four-week-old male Sprague–Dawley rats were fed an HF (palm oil 30% wt:wt) diet alone or with oleuropein (HF-O, 1 g/kg diet) for 28 days. In rats fed HF-O compared to HF, urinary noradrenaline, adrenaline and UCP1 levels in IBAT were significantly higher, whereas plasma leptin levels and the total weight of the abdominal cavity adipose tissue were significantly lower. In anaesthetized 7-week-old male Sprague–Dawley rats, the OA (3.8 mg of intravenous injection)-induced increase in plasma noradrenaline secretion was suppressed by TRPA1 or TRPV1 antagonist and by a β2- or β3-adrenoceptor antagonist. Furthermore, OA-activated rat and human TRPV1s expressed on HEK293 cells at the same level as zingerone (pungent component in ginger). OA also activated humanTRPA1, and its potency was approximately 10-fold stronger than that for TRPV1. These findings suggest that OA is the agonist of both TRPA1 and TRPV1 and that OA enhances UCP1 expression in IBAT with a concomitant decrease in the visceral fat mass of HF-diet-induced obese rats through enhanced noradrenaline secretion via β-adrenergic action following TRPA1 and TRPV1 activation. |
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