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Molecular and Cellular Biology, July 2007, p. 4698-4707, Vol. 27, No. 13
0270-7306/07/$08.00+0     doi:10.1128/MCB.02279-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Adiponectin Secretion Is Regulated by SIRT1 and the Endoplasmic Reticulum Oxidoreductase Ero1-L{alpha}{triangledown} ,{dagger}

Li Qiang, Hong Wang, and Stephen R. Farmer*

Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts 02118

Received 6 December 2006/ Returned for modification 18 January 2007/ Accepted 17 April 2007

Adiponectin is secreted from adipose tissue in response to metabolic effectors in order to sensitize the liver and muscle to insulin. Reduced circulating levels of adiponectin that usually accompany obesity contribute to the associated insulin resistance. The molecular mechanisms controlling the production of adiponectin are essentially unknown. In this report, we demonstrate that the endoplasmic reticulum (ER) oxidoreductase Ero1-L{alpha} and effectors modulating peroxisome proliferator-activated receptor {gamma} (PPAR{gamma}) and SIRT1 activities regulate secretion of adiponectin from 3T3-L1 adipocytes. Specifically, adiponectin secretion and Ero1-L{alpha} expression are induced during the early phase of adipogenesis but are then down-regulated during the terminal phase, coincident with an increased expression of SIRT1. Suppression of SIRT1 or activation of PPAR{gamma} enhances Ero1-L{alpha} expression and stimulates secretion of high-molecular-weight complexes of adiponectin in mature adipocytes. Suppression of Ero1-L{alpha} through expression of a corresponding small interfering RNA reduces adiponectin secretion during the differentiation of 3T3-L1 preadipocytes. Moreover, ectopic expression of Ero1-L{alpha} in Ero1-L{alpha}-deficient 3T3 fibroblasts stimulates the secretion of adiponectin following their conversion into adipocytes and prevents the suppression of adiponectin secretion in response to activation of SIRT1 by exposure to resveratrol. These findings provide a framework to understand the mechanisms by which adipocytes regulate secretion of adiponectin in response to various metabolic states.

* Corresponding author. Mailing address: Department of Biochemistry, Boston University School of Medicine, 715 Albany Street, Boston, MA 02118. Phone: (617) 638-4186. Fax: (617) 638-5339. E-mail: farmer{at}biochem.bumc.bu.edu

{triangledown} Published ahead of print on 23 April 2007.

{dagger} Supplemental material for this article may be found at http://mcb.asm.org/.

Molecular and Cellular Biology, July 2007, p. 4698-4707, Vol. 27, No. 13
0270-7306/07/$08.00+0     doi:10.1128/MCB.02279-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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