飯塚　讓
   Department   School of Medicine, School of Medicine
   Position   Assistant Professor
Article types Original article
Language English
Peer review Peer reviewed
Title The relationship between aquaglyceroporin expression and development of fatty liver in diet-induced obesity and ob/ob mice.
Journal Formal name：Obesity research & clinical practice
Abbreviation：Obes Res Clin Pract
ISSN code：1871403X/1871403X
Domestic / ForeginForegin
Volume, Issue, Page 10(6),pp.710-718
Author and coauthor Hirako Satoshi, Wakayama Yoshihiro, Kim Hyounju, Iizuka Yuzuru, Matsumoto Akiyo, Wada Nobuhiro, Kimura Ai, Okabe Mai, Sakagami Junichi, Suzuki Mamiko, Takenoya Fumiko, Shioda Seiji
Publication date 2016/11
Summary Aquaporin (AQP) 7 and AQP9 are subcategorised as aquaglyceroporins which transport glycerin in addition to water. These AQPs may play a role in the homeostasis of energy metabolism. We examined the effect of AQP7, AQP9, and lipid metabolism-related gene expression in obese mice. In diet-induced obese (DIO) mice, excess lipid accumulated in the liver, which was hyperleptinemic and hyperinsulinemic. Hepatic AQP9 gene expression was significantly increased in both DIO and ob/ob mice compared to controls. The mRNA expression levels of fatty acid and triglyceride synthesis-related genes and fatty acid β oxidation-related genes in the liver were also higher in both mouse models, suggesting that triglyceride synthesis in this organ is promoted as a result of glycerol release from adipocytes. Adipose AQP7 and AQP9 gene expressions were increased in DIO mice, but there was no difference in ob/ob mice compared to wild-type mice. In summary, adipose AQP7 and AQP9 gene expressions are increased by diet-induced obesity, indicating that this is one of the mechanisms by which lipid accumulates in response to a high fat diet, not the genetic mutation of ob/ob mice. Hepatic AQP9 gene expression was increased in both obesity model mice. AQP7 and AQP9 therefore have the potential of defining molecules for the characterisation of obesity or fatty liver and may be a target molecules for the treatment of those disease.
DOI 10.1016/j.orcp.2015.12.001
PMID 26747210