Abstract
Purpose
The purpose of the study was to investigate changes in adiponectin system expression in granulosa cells (GCs) and high molecular weight adiponectin levels in serum and follicular fluid (FF) of 40 women with polycystic ovary syndrome (PCOS) compared to those in 40 women with normal ovary function.
Methods
Adiponectin (Adipo), adiponectin receptor 1 (AdipoR1), and adiponectin receptor 2 (AdipoR2) messenger RNA (mRNA) expression levels were measured using quantitative real-time polymerase chain reaction (qRT-PCR). High molecular weight (HMW) adiponectin protein concentration was evaluated by ELISA method. Data were analyzed using Student’s t test and one-way ANOVA in SPSS 21 software. At oocyte retrieval, FF was aspirated and GCs were obtained from a pooled collection of FF per each patient.
Results
PCR results showed expression of adiponectin, AdipoR1, AdipoR2, follicle-stimulating hormone receptor (FSHR), and luteinizing hormone receptor (LHR) in GCs. After controlling body mass index (BMI) values, qRT-PCR demonstrated a decreased expression of adiponectin system in GCs of PCOS patients compared to those in controls (p = 0.001). There was a strong positive correlation among AdipoR1 and AdipoR2 expression and also among FSH and LH receptor expression. (Both r = 0.8, p = 0.001). There were low levels of high molecular weight adiponectin in the serum of PCOS patients with controlled ovarian hyperstimulation (30.19 ± 4.3 ng/ml) compared to the controls (48.47 ± 5.9 ng/ml) and in the FF of PCOS patients with controlled ovarian hyperstimulation (7.86 ± 1.44 ng/ml) compared to the controls (14.22 ± 2.01 ng/ml; p = 0.02).
Conclusions
Lower expression of adiponectin and its receptors in GCs might be an important manifestation in gonadotropin-stimulated PCOS patients which could influence the physiologic adiponectin roles such as interaction with insulin and LH in induction of GC gene expression.
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Acknowledgments
We express our appreciation to the Research Center for Endometrium and Endometriosis and Research Center for Molecular Medicine, Hamadan University of Medical Sciences, for their technical assistance.
This work was supported by the Research and Technology Deputy of Iran University of Medical Sciences as a Ph.D. thesis (grant no. 16169).
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This cross-sectional study was reviewed and approved by the Iran University of Medical Sciences Ethics Committee. An informed consent was obtained from each participant.
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Capsule The low expression of adiponectin and its receptors in PCOS patients could influence the oocyte quality and may lead to intrinsic oocyte abnormalities.
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Artimani, T., Saidijam, M., Aflatoonian, R. et al. Downregulation of adiponectin system in granulosa cells and low levels of HMW adiponectin in PCOS. J Assist Reprod Genet 33, 101–110 (2016). https://doi.org/10.1007/s10815-015-0620-1
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DOI: https://doi.org/10.1007/s10815-015-0620-1