Serum activin A and follistatin concentrations during human pregnancy: a cross-sectional and longitudinal study

Open Access
Publisher Website
Google Scholar
Abstract
Activin A, a dimer of the βA-subunit of inhibin, has been shown to have multiple biological activities and sites of production. Follistatin is a high-affinity binding protein for activin, which neutralizes its activity. This study provides the first data, using a cross-sectional design, on the measurement of both these proteins in the maternal circulation of a large cohort of women (6–39 weeks of gestation, n = 2–20 women/time point) during normal pregnancies, and confirms that similar patterns are seen in nine women studied longitudinally during pregnancy. The concentrations of total activin A were measured using a specific two-site enzyme-linked immunosorbent assay (ELISA), and a new radioimmunoassay for measuring total follistatin in serum utilizing dissociating reagents to eliminate the interference of activin is described. At 38–39 weeks gestation, both activin A and follistatin concentrations rose to a peak (4.59 ± 0.54 ng/ml and 72.7 ± 3.31 ng/ml, respectively). The activin A and follistatin concentrations were highly correlated both in the cross-sectional study (P P <0.05–0.0001). Concentrations of follistatin showed a greater increase in the second trimester of pregnancy relative to activin A concentrations. The parallel increase in the secretion of these two proteins throughout pregnancy probably reflects feto-placental secretion.

This publication has 0 references indexed in Scilit: