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Activin A and Follistatin in Menstrual Blood: Low Concentrations in Women With Dysfunctional Uterine Bleeding

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Abstract

Activin A and follistatin are growth factors produced by several organs, comprising the endometrium, where they modulate cell and tissue differentiation. In this study, the authors tested whether activin A and follistatin are measurable in menstrual blood and whether their concentrations change in women with dysfunctional uterine bleeding (DUB). The authors evaluated healthy women with regular menstrual cycles (n = 15) and women with DUB (n = 12). Activin A and follistatin were measured in both menstrual and peripheral blood samples using highly sensitive enzyme immunoassays, whereas their respective mRNAs were quantified by real-time polymerase chain reaction in endometrial samples collected during the perimenstrual period. Activin A concentrations were 4-fold higher in menstrual than in peripheral serum of healthy women (mean ± SE, 4.24 ± 0.18 vs 1.00 ± 0.15 ng/mL, P < .001) and were significantly lower in women with DUB compared to healthy subjects (P < .001). Follistatin concentration was 8-fold higher in menstrual than in peripheral serum of healthy women (3.94 ± 0.49 vs 0.49 ± 0.04 ng/mL, P < .001) and was significantly lower in the menstrual serum of women with DUB compared to controls (P < .001). There was no correlation between menstrual and peripheral serum concentrations of both proteins. The endometrial expression of activin A and follistatin mRNA was lower in women with DUB compared to controls (P < .05). Both activin A and follistatin are measurable in high concentrations in human menstrual blood and are relatively lower in women with DUB. The quantitative assessment of activin A and follistatin in menstrual serum might be a putative clinical marker of endometrial function.

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Correspondence to Felice Petraglia MD, Obstetrics and Gynaecology.

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This research was supported by CNPq, Ministry of Science and Technology, Brazil; the Italian Ministry of University and Scientific Research; and the University of Siena, Italy.

We thank Irene M. Dias, RN, for her excellent technical assistance.

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Reis, F.M., Nascimento, L.L., Tsigkou, A. et al. Activin A and Follistatin in Menstrual Blood: Low Concentrations in Women With Dysfunctional Uterine Bleeding. Reprod. Sci. 14, 383–389 (2007). https://doi.org/10.1177/1933719107303985

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