4.6 Article

GRK5 deficiency decreases diet-induced obesity and adipogenesis

Journal

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2012.04.006

Keywords

White adipose tissue; High-fat diet; Preadipocyte; Lipogenesis

Funding

  1. Ministry of Science and Technology [2009CB522006]
  2. Natural Science Foundation of China [30830042, 31121061, 30900438]

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Identification of the protein factors that regulate the adipogenesis and lipid metabolism of adipose tissue is critical for the understanding of the physiology and pathology of obesity and energy homeostasis. In this study, we found that G protein coupled receptor (GPCR) kinase 5 (GRK5) was expressed at a relatively high level in the white adipose tissue. When fed on a high-fat diet, GRK5(-/-) mice gained significantly less weight and had decreased WAT mass than their wild type littermates, which could not be attributed to alterations in food consumption or energy expenditure. However, GRK5(-/-) mice showed a 30-70% decreased expression of lipid metabolism and adipogenic genes in WAT. Moreover, GRK5(-/-) embryonic fibroblasts and preadipocytes exhibited 40-70% decreased expression of adipogenic genes and impaired adipocyte differentiation when induced in vitro. Taken together, these results suggest that GRK5 is an important regulator of adipogenesis and is crucial for the development of diet-induced obesity. (C) 2012 Elsevier Inc. All rights reserved.

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