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Human Reproduction, Vol. 17, No. 8, 2152-2159, August 2002
© 2002 European Society of Human Reproduction and Embryology

Effect of preantral follicle isolation technique on in-vitro follicular growth, oocyte maturation and embryo development in mice

I. Demeestere1,4, A. Delbaere2, C. Gervy3, M. Van den Bergh1,2, F. Devreker2 and Y. Englert1,2

1 Research Laboratory on Human Reproduction, 2 Fertility Clinic and 3 Laboratory of Chemistry, Erasme Hospital, French Speaking Free University of Brussels, Route de Lennik 808, 1070 Brussels, Belgium

BACKGROUND: The use of mechanical and enzymatic techniques to isolate preantral follicles before in-vitro culture has been previously described. The aim of this study was to assess the effect of the isolation procedure of mouse preantral follicles on their subsequent development in vitro. METHODS: Follicles were isolated either mechanically or enzymatically and cultured using an individual non-spherical culture system. Follicular development and steroidogenesis, oocyte in-vitro maturation and embryo development were assessed for both groups. RESULTS: After 12 days of culture, follicles isolated mechanically had a higher survival rate but a lower antral-like cavity formation rate than follicles isolated enzymatically. Enzymatic follicle isolation was associated with a higher production of testosterone and estradiol compared with mechanical isolation. A stronger phosphatase alkaline reaction was observed after enzymatic isolation, suggesting that follicles isolated enzymatically had more theca cells than those isolated mechanically. However, both isolation techniques resulted in similar oocyte maturation and embryo development rates. CONCLUSIONS: Enzymatic follicular isolation did not affect theca cell development. Follicular steroidogenesis was enhanced after enzymatic isolation but the developmental capacity of oocytes was comparable to that obtained after mechanical isolation.

Key words: follicle/isolation/in-vitro culture/mouse/theca

4 To whom correspondence should be addressed. E-mail: idemeest{at}ulb.ac.be


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