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Human Reproduction, Vol 13, 285-289, Copyright © 1998 by Oxford University Press

ARTICLES

Insulin-like growth factor (IGF)-I and IGF binding protein-3 concentrations in fluid from human stimulated follicles

GJ Oosterhuis, I Vermes, CB Lambalk, HW Michgelsen and J Schoemaker
Department of Clinical Chemistry, Medisch Spectrum Twente Hospital Group, Enschede, The Netherlands.

Insulin-like growth factor-I (IGF-I) and IGF binding protein-3 (IGFBP- 3) play an important role in regulating follicle growth and maturation. We have evaluated whether responsiveness to gonadotrophins during an in- vitro fertilization (IVF) treatment is related to follicular fluid IGF- I and IGFBP-3 concentrations. We also investigated if a difference is present in IGF-I and IGFBP-3 concentrations between patients treated with human menopausal gonadotrophin (HMG) and patients treated with highly purified follicle stimulating hormone (FSH). We have measured IGF-I and IGFBP-3 in follicular fluid from pre-ovulatory follicles in an IVF programme. All 70 patients were stimulated after being down- regulated with a gonadotrophin-releasing hormone (GnRH) analogue. IGF-I concentrations in follicular fluid were significantly inversely correlated with the number of ampoules FSH administered and number of days of FSH administration, and significantly correlated with the number of follicles aspirated. IGFBP-3 concentrations were not correlated with any other parameter measured nor were IGF-I and IGFBP-3 concentrations correlated. IGFBP-3 concentrations were significantly higher in patients receiving highly purified FSH compared with patients receiving HMG (P < 0.005). These results are new evidence that IGF-I concentration in follicular fluid is higher in women who respond better to follicular stimulation, i.e. women who grow many follicles, women who need a shorter duration of stimulation and women who need fewer ampoules FSH before oocyte retrieval.
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