Tan, Bee K., Chen, Jing, Lehnert, Hendrik, Kennedy, Richard and Randeva, Harpal S.. (2007) Raised serum, adipocyte, and adipose tissue retinol-binding protein 4 in overweight women with polycystic ovary syndrome: effects of gonadal and adrenal steroids. Journal of Clinical Endocrinology & Metabolism , Vol.92 (No.7). pp. 2764-2772. ISSN 0021-972x

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Abstract

Context: Polycystic ovary syndrome (PCOS) is associated with insulin resistance and obesity. Recent studies have shown that serum retinol-binding protein 4 (RBP4) levels increase with obesity. Currently, no data exist on the relative expression of RBP4 in either serum or adipose tissue of PCOS women. Objectives: mRNA expression of RBP4 from sc and omental (om) adipose tissue and sc adipocytes in overweight PCOS women were compared with matched controls; RBP4 protein in adipose tissue and serum RBP4 levels were also assessed. Additionally, we studied the effects of testosterone, 17 beta-estradiol, androstenedione, and dehydroepiandrosterone sulfate on RBP4 expression in adipose tissue explants. Design: Real-time RT-PCR and Western blotting were used to assess the relative mRNA and protein expression of RBP4. Biochemical measurements were also performed. Results: Compared with controls, there was significant up- regulation of RBP4 mRNA in sc (P < 0.05) and om (P < 0.01) adipose tissue as well as isolated sc adipocytes (P < 0.01) of PCOS women. In addition to elevated serum RBP4 levels in PCOS women (P < 0.05), RBP4 protein levels were significantly greater in sc and om adipose tissue of PCOS women (P < 0.05 and P < 0.05, respectively). Furthermore, in human sc and om adipose tissue explants, 17 beta-estradiol significantly increased RBP4 mRNA expression, protein levels, and secretion into the culture media (P < 0.05). Conclusions: The precise reason for elevated levels of RBP4 in overweight PCOS women is unknown, but it appears that 17 beta-estradiol may play a role in their regulation in adipose tissue.

Item Type:	Journal Article
Subjects:	R Medicine > RC Internal medicine
Divisions:	Faculty of Medicine > Warwick Medical School > Clinical Sciences Research Institute (CSRI)
Journal or Publication Title:	Journal of Clinical Endocrinology & Metabolism
Publisher:	Endocrine Society
ISSN:	0021-972x
Date:	July 2007
Volume:	Vol.92
Number:	No.7
Number of Pages:	9
Page Range:	pp. 2764-2772
Identification Number:	10.1210/jc.2007-0091
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/31678

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