Abstract
Context
Adropin is a peptide hormone implicated in the regulation of insulin sensitivity and energy homeostasis. Polycystic ovary syndrome (PCOS) is a metabolic and reproductive disease associated with insulin resistance. It has been demonstrated that various inflammatory markers increased in PCOS including TNF-α. TNF-α regulates the secretion of certain peptides which play a crucial role in glucose and lipid homeostasis. There is also some evidence of a link between TNF-α and adropin.
Objective
To ascertain whether there is an association between circulating adropin levels and TNF-α in PCOS.
Patients and design
152 women with PCOS and 152 age- and body mass index-matched controls without PCOS were recruited for this cross-sectional study.
Main outcome measures
Adropin and TNF-α levels were measured using ELISA.
Results
Adropin levels were lower in the PCOS group compared with the control group (7.43 ± 0.79 vs. 9.42 ± 0.76 ng/ml, P < 0.001), whereas TNF-α levels were higher (49.93 ± 3.39 vs. 35.83 ± 2.47 pg/ml, P < 0.001). A strongly negative correlation was found between circulating adropin levels and TNF-α levels in women with PCOS (r = −0.407, P < 0.001). Binary logistic regression analysis revealed that decreased adropin levels were significantly associated with high odds of having PCOS, although, after adjustment for TNF-α, this link vanished. Additionally, multiple linear regression analysis showed that HOMA-IR and TFN-α independently predicted adropin levels.
Conclusions
Serum adropin levels are significantly decreased in PCOS and are inversely associated with TNF-α. Further dissection of the nature of this association can open new therapeutic options for metabolic diseases.
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Abbreviations
- AdrKO:
-
Adropin knockout mice
- BMI:
-
Body mass index
- CI:
-
Confidence interval
- CV:
-
Coefficient of variability
- E2 :
-
Estradiol
- FBG:
-
Fasting blood glucose
- FG:
-
Ferriman-Gallwey
- HDL-C:
-
High density lipoprotein cholesterol
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance
- hs-CRP:
-
High sensitivity C-reactive protein
- HUVECs:
-
Human umbilical vein endothelial cells
- LDL-C:
-
Low density lipoprotein cholesterol
- OR:
-
Odds ratio
- PCOS:
-
Polycystic ovary syndrome
- TNF-α:
-
Tumor necrosis factor alpha
- VIF:
-
Variance inflation factor
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Author contributions
T.K., M.C., G.U.K., and O.G.C. participated in study design and performed ELISA. T.K., M.C., P.Y. and M.B. participated in study design, analyzed the data, wrote, reviewed and edited the manuscript. O.Y, M.T. provided serum samples and contributed to discussions of data interpretation. M.C. is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
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The study was conducted in compliance with the Declaration of Helsinki.
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Informed consent was obtained from all individual participants included in the study.
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Kume, T., Calan, M., Yilmaz, O. et al. A possible connection between tumor necrosis factor alpha and adropin levels in polycystic ovary syndrome. J Endocrinol Invest 39, 747–754 (2016). https://doi.org/10.1007/s40618-016-0453-5
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DOI: https://doi.org/10.1007/s40618-016-0453-5