期刊
MOLECULAR AND CELLULAR ENDOCRINOLOGY
卷 426, 期 C, 页码 50-60出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2016.02.004
关键词
Pigment epithelium-derived factor; Metabolism; beta-Cell; Insulin; ATGL; Lipolysis
资金
- School of Biomedical Sciences
- School of Pharmacy, Faculty of Health Sciences and CHIRI Biosciences
Pigment epithelium-derived factor (PEDF) is a multifunctional glycoprotein, associated with lipid catabolism and insulin resistance. In the present study, PEDF increased chronic and acute insulin secretion in a clonal rat beta-cell line BRIN-BD11, without alteration of glucose consumption. PEDF also stimulated insulin secretion from primary mouse islets. Seahorse flux analysis demonstrated that PEDF did not change mitochondria( respiration and glycolytic function. The cytosolic presence of the putative PEDF receptor - adipose triglyceride lipase (ATGL) - was identified, and ATGL associated stimulation of glycerol release was robustly enhanced by PEDF, while intracellular ATP levels increased. Addition of palmitate or ex vivo stimulation with inflammatory mediators induced beta-cell dysfunction, effects not altered by the addition of PEDF. In conclusion, PEDF increased insulin secretion in BRIN-BD11 and islet cells, but had no impact on glucose metabolism. Thus elevated lipolysis and enhanced fatty acid availability may impact insulin secretion following PEDF receptor (ATGL) stimulation. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
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