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ISSN: 2157-7013

Journal of Cell Science & Therapy
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Research Article

AQP7 Up-Regulation in the Skeletal Muscles of Mice with Diet Induced Obesity

Yoshihiro Wakayama1,2*, Satoshi Hirako2, Takahiro Jimi3 and Seiji Shioda2

1Wakayama Clinic, Machida-shi, Tokyo, Japan

2Department of Anatomy, Showa University School of Medicine, Shinagawa-ku, Tokyo, Japan

3Division of Neurology, Machida-Keisen Hospital, Machida-shi, Tokyo, Japan

*Corresponding Author:
Yoshihiro Wakayama
2-3-18 Kanai, Machida-shi, Tokyo, Japan
Tel: 81-045-974-2204
E-mail: [email protected]

Received Date: March 18, 2015; Accepted Date: April 15, 2015; Published Date: April 20, 2015

Citation: Wakayama Y, Hirako S, Jimi T, Shioda S (2015) MAQP7 Up-Regulation in the Skeletal Muscles of Mice with Diet Induced Obesity. J Cell Sci Ther 6:205. doi: 10.4172/2157-7013.1000205

Copyright: © 2015 Wakayama Y, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Aquaporin (AQP) 7 and AQP9 are membrane proteins and are the members of aquaglyceroporin which transports glycerol in addition to water molecule. Glycerol is a direct source of glycerol-3 phosphate for the synthesis of triglycerides. We thought that the expression of AQP7 and AQP9 would be altered in the skeletal myofibers in mice with diet-induced obesity (DIO) as compared with that of control chaw-fed mice. RNA and protein levels of AQP7 and AQP9 were studied in the quadriceps femoris muscles of mice with DIO and normal control mice. Real time quantitative RT-PCR analysis showed that mouse AQP7 mRNA levels in skeletal muscles were significantly higher in mice with DIO than in normal control mice (P<0.01); whereas mouse AQP9 mRNA levels were not different between the two groups (P>0.05). Histochemically the myofibers of mice with DIO contained numerous lipid droplets in oil red O stain samples. Immunohistochemical study of DIO mouse muscles showed enhanced expression of AQP7 at the myofiber surface membranes; while AQP9 expression appeared to be similar to that of normal control mice. These findings imply that the up-regulated expression of AQP7 in DIO mouse muscles facilitates the secretion of glycerol from myocytes.

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