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Omentin-1, a novel adipokine, is decreased in overweight insulin-resistant women with polycystic ovary syndrome : ex vivo and in vivo regulation of omentin-1 by insulin and glucose
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Tan, Bee K., Adya, Raghu, Farhatullah, S., Lewandowski, Kris C., O'Hare, J. Paul, Lehnert, Hendrik and Randeva, Harpal S.. (2008) Omentin-1, a novel adipokine, is decreased in overweight insulin-resistant women with polycystic ovary syndrome : ex vivo and in vivo regulation of omentin-1 by insulin and glucose. Diabetes, Vol.57 (No.4). pp. 801-808. ISSN 0012-1797
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Official URL: http://dx.doi.org/10.2337/db07-0990
Abstract
OBJECTIVE - Polycystic ovary syndrome (PCOS) is associated with insulin resistance and obesity. Recent studies have shown that plasma omentin-1 levels decrease with obesity. Currently, no data exist on the relative expression and regulation of omentin-1 in adipose tissue of women with PCOS. The objective of this study was to assess mRNA and protein levels of omentin-1, including circulating omentin-1, in omental adipose tissue of women with PCOS and matched control subjects. Ex vivo and in vivo regulation of adipose tissue omentin-1 was also studied. RESEARCH DESIGN AND METHODS - Real-time RT-PCR and Western blotting were used to assess mRNA and protein expression of omentin-1. Plasma omentin-1 was measured by enzyme-linked immunosorbent assay. The effects Of D-glucose, insulin, and gonadal and adrenal steroids on adipose tissue omentin-1 were analyzed ex vivo. The in vivo effects of insulin (hyperinsulinemia) on omentin-1 levels were also assessed by a prolonged insulin-glucose infusion. RESULTS - In addition to decreased plasma omentin-1 levels in women with PCOS (P < 0.05), compared with control subjects, there was significantly lower levels of omentin-1 mRNA (P < 0.01) and protein (P < 0.05) in omental adipose tissue of women with PCOS (P < 0.01). Furthermore, in omental adipose tissue explants, insulin and glucose significantly dose-dependently decreased omentin-1 mRNA expression, protein levels, and secretion into conditioned media (P < 0.05, P < 0.01). Also, hyperinsulinemic induction in healthy subjects significantly reduced plasma omentin-1 levels (P < 0.01). CONCLUSIONS - Our novel findings reveal that omentin-1 is downregulated by insulin and glucose. These may, in part, explain the decreased omentin-1 levels observed in our overweight women with PCOS.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QP Physiology R Medicine > RC Internal medicine R Medicine > RG Gynecology and obstetrics |
| Divisions: | Faculty of Medicine > Warwick Medical School > Clinical Sciences Research Institute (CSRI) Faculty of Medicine > Warwick Medical School > Metabolic and Vascular Health Faculty of Medicine > Warwick Medical School |
| Library of Congress Subject Headings (LCSH): | Polycystic ovary syndrome -- Research, Obesity, Insulin resistance, Adipose tissues |
| Journal or Publication Title: | Diabetes |
| Publisher: | American Diabetes Association |
| ISSN: | 0012-1797 |
| Date: | April 2008 |
| Volume: | Vol.57 |
| Number: | No.4 |
| Number of Pages: | 8 |
| Page Range: | pp. 801-808 |
| Identification Number: | 10.2337/db07-0990 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | General Charities of the City of Coventry |
| URI: | http://wrap.warwick.ac.uk/id/eprint/30302 |
Data sourced from Thomson Reuters' Web of Knowledge
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