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http://dx.doi.org/10.3746/jkfn.2014.43.11.1688

Anti-Obesity Effects of Jeju Hallabong Tangor (Citrus kiyomi${\times}$ponkan) Peel Extracts in 3T3-L1 Adipocytes  

Lim, Heejin (Department of Food and Nutrition, College of Natural Sciences, Myongji University)
Seo, Jieun (Department of Food and Nutrition, College of Natural Sciences, Myongji University)
Chang, Yun-Hee (Department of Food and Nutrition, College of Natural Sciences, Myongji University)
Han, Bok-Kyung (BKbio Co. Ltd.)
Jeong, Jung-Ky (BKbio Co. Ltd.)
Park, Su-Beom (BKbio Co. Ltd.)
Choi, Hyuk-Joon (BKbio Co. Ltd.)
Hwang, Jinah (Department of Food and Nutrition, College of Natural Sciences, Myongji University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.43, no.11, 2014 , pp. 1688-1694 More about this Journal
Abstract
Jeju Hallabong Tangor (Citrus kiyomi${\times}$ponkan) is a Citrus species with a variety of physiological properties such as anti-oxidant, anti-inflammation, anti-cancer, and anti-obesity. We investigated the anti-obesity effects of Hallabong Tangor peel extracts before (HLB) and after (HLB-C) bioconversion with cytolase based on modulation of adipocyte differentiation and lipid metabolism in 3T3-L1 adipocytes. Treatment with cytolase decreased flavanone rutinoside forms (narirutin and hesperidin) and increased flavanone aglycone forms (naringenin and hesperetin). During adipocyte differentiation, 3T3-L1 cells were treated with 0.5 mg/mL of Sinetrol (a positive control), HLB or HLB-C. Adipocyte differentiation was inhibited in both citrus groups, but not in control and Sinetriol groups. HLB and HLB-C tended to reduce insulin-induced mRNA levels of CCAAT/enhancer-binding protein ${\alpha}$ ($C/EBP{\alpha}$) and sterol regulatory element-binding protein 1c (SREBP1c). Compared to the control and Sinetrol groups, HLB and HLB-C markedly suppressed insulin-induced protein expression of $C/EBP{\alpha}$ and peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$). The HLB and Sinetrol groups, but not HLB-C group, significantly increased adipolytic activity with higher release of free glycerol compared to the control group in differentiated 3T3-L1 adipocytes. These results suggest that bio-conversion of Hallabong Tangor peel extracts with cytolase increases aglycone flavonoids. Irrespective of bioconversion, both Hallabong Tangor peel extracts exert anti-obesity effects that may contribute to prevention of obesity through inhibition of adipocyte differentiation or induction of adipolytic activity.
Keywords
Hallabong Tangor; Citrus kiyomi${\times}$ponkan; bioconversion; anti-obesity; 3T3-L1 adipocytes;
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