Dissociation of diabetes and obesity in mice lacking orphan nuclear receptor small heterodimer partner

Title

Dissociation of diabetes and obesity in mice lacking orphan nuclear receptor small heterodimer partner

Creator

Park Y J; Kim S C; Kim J; Anakk S; Lee J M; Tseng H T; Yechoor V; Park J; Choi J S; Jang H C; Lee K U; Novak C M; Moore D D; Lee Y K

Publisher

Journal of Lipid Research

Date

2011
2011-12

Description

Mixed background SHP(-/-) mice are resistant to diet-induced obesity due to increased energy expenditure caused by enhanced PGC-1 alpha expression in brown adipocytes. However, congenic SHP(-/-) mice on the C57BL/6 background showed normal expression of PGC-1 alpha and other genes involved in brown adipose tissue thermogenesis. Thus, we reinvestigated the impact of small heterodimer partner (SHP) deletion on diet-induced obesity and insulin resistance using congenic SHP(-/-) mice. Compared with their C57BL/6 wild-type counterparts, SHP(-/-) mice subjected to a 6 month challenge with a Western diet (WestD) were leaner but more glucose intolerant, showed hepatic insulin resistance despite decreased triglyceride accumulation and increased beta-oxidation, exhibited alterations in peripheral tissue uptake of dietary lipids, maintained a higher respiratory quotient, which did not decrease even after WestD feeding, and displayed islet dysfunction. Hepatic mRNA expression analysis revealed that many genes expressed higher in SHP(-/-) mice fed WestD were direct peroxisome proliferator-activated receptor alpha (PPAR alpha) targets. Indeed, transient transfection and chromatin immunoprecipitation verified that SHP strongly repressed PPAR alpha-mediated transactivation. SHP is a pivotal metabolic sensor controlling lipid homeostasis in response to an energy-laden diet through regulating PPAR alpha-mediated transactivation. The resultant hepatic fatty acid oxidation enhancement and dietary fat redistribution protect the mice from diet-induced obesity and hepatic steatosis but accelerate development of type 2 diabetes.-Park, Y. J., S. C. Kim, J. Kim, S. Anakk, J. M. Lee, H-T. Tseng, V. Yechoor, J. Park, J-S. Choi, H. C. Jang, K-U. Lee, C. M. Novak, D. D. Moore, and Y. K. Lee. Dissociation of diabetes and obesity in mice lacking orphan nuclear receptor small heterodimer partner. J. Lipid Res. 2011. 52: 2234-2244.

Subject

beta-oxidation; Biochemistry & Molecular Biology; birth-weight; diet-induced obesity; fatty-acid oxidation; hepatic steatosis; induced; insulin sensitivity; insulin-resistance; lipid-metabolism; liver; negative feedback-regulation; oxygen consumption; quotient; respiratory; retinoic acid; signaling pathways; skeletal-muscle

Identifier

Format

Journal Article

Search for Full-text

Users with a NEOMED Library login can search for full-text journal articles at the following url: https://libraryguides.neomed.edu/home

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

2234-2244

Issue

12

Volume

52

Citation

Park Y J; Kim S C; Kim J; Anakk S; Lee J M; Tseng H T; Yechoor V; Park J; Choi J S; Jang H C; Lee K U; Novak C M; Moore D D; Lee Y K, “Dissociation of diabetes and obesity in mice lacking orphan nuclear receptor small heterodimer partner,” NEOMED Bibliography Database, accessed February 28, 2021, https://neomed.omeka.net/items/show/6718.

Social Bookmarking