Correlation between follicular fluid content and the results of in vitro fertilization and embryo transfer. III. Proteoglycans

Abstract

Using a specific proteoglycan (PG) radioimmunoassay (RIA) in which human cartilage antiserum was directed against the PG protein core, the PG content of follicular fluid (FF) obtained from 42 women undergoing in vitro fertilization (IVF) and embryo transfer (ET) was studied as a function of IVF-ET outcome. Inhibition curves of purified PG cartilage preparations were parallel to those of large and small nonstimulated follicles and follicles that had been stimulated by a luteinizing hormone-releasing hormone (LHRH) agonist, d-tryptophan-6 (Decapeptyl: D-Trp6 analogue, Beaufour Laboratories, IPSEN Biotech, Paris, France), and human menopausal gonadotropin (hMG). While FF levels of immunoreactive PG-like material (Ir-PG) did not differ according to IVF-ET outcome, highly significant negative correlations were obtained between FF 17 beta-estradiol levels and FF Ir-PG levels in oocyte groups where pregnancy was obtained, i.e., oocytes were fertilized and cleaved, and pregnancy followed either for each ET or for one of two embryos reimplanted. The correlation persisted but weakened when all groups were pooled together. No correlation was observed between FF Ir-PG and progesterone. RIA or bioassay showed a positive correlation between FF inhibin and Ir-PG for the group in which each ET led to a pregnancy. Ir-PG concentrations were significantly greater in smaller than in larger follicles collected from untreated women. Upon induction of ovulation with either pure follicle-stimulating hormone (FSH), FSH + human chorionic gonadotropin (hCG), or D-Trp6/hMG + hCG, this difference no longer appeared. These results indicate that the reduction of Ir-PG concentrations constitutes an index of follicular maturation.(ABSTRACT TRUNCATED AT 250 WORDS)