Objective: Postmenopausal estrogen deficiency is associated with chronic inflammatory events that cause cardiovascular and osteoporosis diseases. The aim of this study was to investigate the relationship between interleukin (IL)-17 and serum estradiol levels, age, and postmenopausal duration, as well as bone loss.
Methods: The relationship between serum IL-17A and estradiol levels was studied in 72 postmenopausal women and 22 premenopausal women. Enzyme-linked immunosorbent assay and chemiluminescence were used to detect IL-17A and estradiol, respectively.
Results: Estradiol levels were significantly higher and IL-17A levels were significantly lower in premenopausal women compared with postmenopausal women (estradiol: 239.44 [226.17] vs 74.21 [4.44] pmol/L, P < 0.0001; IL-17A: 2.88 [0.08] vs 3.5 [0.56] ng/mL, P < 0.0001). Seventy-eight of 94 women had lower estradiol levels (<83 pmol/L) with elevated IL-17A levels, in comparison with 16 women who had normal estrogen levels (3.43 [0.56] vs 3.01 [0.38] ng/mL, P < 0.0001). IL-17A levels inversely correlated with the total lumbar T-scores calculated in all women (P < 0.0001). IL-17A levels showed age-related dependency and a remarkable association with the postmenopausal period (P < 0.03).
Conclusions: The results demonstrate a high prevalence of increased serum IL-17A levels in postmenopausal estrogen deficiency, which can play an inducing role in chronic inflammatory events such as bone loss.
From the 1Immunoendocrinology and Osteoporosis Center, EndoMed, Debrecen, Hungary; and 2Regional Center of Hungarian National Blood Transfusion Service, Debrecen, Hungary.
This research has the permission of the Regional and Institutional Research Ethical Committee of the University of Debrecen Medical and Health Science Center (DEOEC RKEB/IKEB 3099-2010).
Financial disclosure/conflicts of interest: None reported.
Address correspondence to: Ildikó Molnár, MD, PhD, Immunoendocrinology and Osteoporosis Center, Bem tér 18/C, Debrecen H-4026, Hungary. E-mail: firstname.lastname@example.org