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Insulin Resistance Directly Contributes to Androgenic Potential Within Ovarian Theca Cells
- Source :
-
Fertility & Sterility . May2009 Supplement, Vol. 91 Issue 5, p1990-1997. 8p. - Publication Year :
- 2009
-
Abstract
- <bold>Objective: </bold>To investigate whether insulin resistance (IR) within theca cells may directly contribute to their hyperandrogenism, a heritable trait of polycystic ovary syndrome (PCOS).<bold>Design: </bold>In vitro cell model.<bold>Setting: </bold>University-affiliated laboratory.<bold>Animal(s): </bold>Porcine ovaries.<bold>Intervention(s): </bold>Ovarian theca cells from porcine follicles were isolated and cultured. Insulin resistance was induced in theca cells without (Con) or with dexamethasone (Dex); cells were further treated by troglitazone (Tro) and metformin (Met) in IR cells or by vehicle only in IR and Con cells.<bold>Main Outcome Measure(s): </bold>Medium glucose and T levels; reverse transcriptase polymerase chain reaction (RT-PCR) and Western blot for insulin signal molecules and androgenic enzyme.<bold>Result(s): </bold>As compared with Con cells, Dex-treated cells had significantly lower [(3)H]-glucose uptake (565 +/- 58 cpm/10(6) vs. 1077 +/- 78 cpm/10(6)) but higher medium glucose levels (16.31 +/- 0.39 nmol/L vs. 10.62 +/- 1.02 nmol/L) and had approximately twofold T levels (0.82 +/- 0.20 microg/L vs. 0.38+/-0.08 microg/L). Troglitazone and Met significantly reduced the medium glucose and testosterone concentrations to levels comparable to those in Con cells. The RT-PCR and Western blot showed that the two sensitizers in different ways reversed the altered messenger RNA and protein expression of insulin receptor substrate-1, glucose transporter-4, peroxisome proliferator-activated receptor-gamma, and 17 alpha-hydroxylase in Dex-induced IR cells.<bold>Conclusion(s): </bold>Insulin resistance induced by Dex could directly exaggerate androgenic potential within theca cells, suggesting the possible involvement of this ovarian metabolic phenotype in PCOS hyperandrogenism. [ABSTRACT FROM AUTHOR]
- Subjects :
- *INSULIN resistance
*CELL physiology
*HYPERANDROGENISM
*OVARIES
*POLYCYSTIC ovary syndrome
*LABORATORY swine
*OVARIAN follicle
*CELL culture
*DEXAMETHASONE
*GENE expression
*ANDROGENS
*ANIMAL experimentation
*BENZOPYRANS
*CARRIER proteins
*COMPARATIVE studies
*RESEARCH methodology
*MEDICAL cooperation
*OXIDOREDUCTASES
*POLYMERASE chain reaction
*PROTEINS
*RESEARCH
*RNA
*SWINE
*EVALUATION research
*METFORMIN
*REVERSE transcriptase polymerase chain reaction
*THIAZOLIDINEDIONES
*PHARMACODYNAMICS
Subjects
Details
- Language :
- English
- ISSN :
- 00150282
- Volume :
- 91
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Fertility & Sterility
- Publication Type :
- Academic Journal
- Accession number :
- 38331394
- Full Text :
- https://doi.org/10.1016/j.fertnstert.2008.02.167