Wathen N C, Egembah S, Campbell D J, Farkas A, Chard T
Combined Academic Department of Obstetrics, Gynaecology, St Bartholomew's Hospital, West Smithfield, London, UK.
J Endocrinol. 1993 May;137(2):R1-4. doi: 10.1677/joe.0.137r001.
Concentrations of IGF-binding protein-1 (IGFBP-1) were measured by radioimmunoassay in 176 amniotic fluid samples from 9 to 20 and 36 to 42 weeks of pregnancy. Low levels of IGFBP-1 were present at 9 and 10 weeks (median values 35.0 and 45.0 micrograms/l respectively). After 10 weeks, the levels increased by four orders of magnitude to reach a peak at 16 weeks (median 145.2 mg/l). After 16 weeks levels fell. Near term, the levels (median 27.1 mg/l) were lower than in the second trimester. The rapid increase in IGFBP-1 shown by radioimmunoassay was confirmed by Western ligand blotting. The findings suggest that the regulatory role of IGFBP-1 in the growth or differentiation of the fetus or of its surrounding membranes may change as pregnancy advances.
