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By Tan, Seang Lin

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Extra info for In Vitro Maturation of Human Oocytes

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The production of follicular fluid is driven by accumulation of salts and water in the antrum78, with sodium appearing to be actively accumulated in the later stages of development79. This may go some way to explain the increase in intrafollicular pressure observed prior to ovulation in the hamster80 and other species81. Lastly, it has recently been shown that the increase in glucose consumption by cow oocyte–cumulus complexes during maturation can, in part, be explained by the synthesis of hyaluronic from glucose metabolites, which facilitates cumulus expansion57.

The competence to adjust follicular glucose metabolism is acquired by the oocyte in the later stages of follicle development47, presumably at a point when oxygen tension in follicular fluid becomes critically low. Healthy human oocytes are retrieved from follicles in which the oxygen tension is high (4–5%), and when oxygen availability is low (1– 2%) oocyte viability is severely compromised54. When mouse follicles are cultured in low oxygen, the oocyte maturation rate is lower with a higher incidence of unaligned chromosomes55.

Fertil Steril 1997; 68: 682–8. 25. Wright CS, Hovatta O, Margara R et al. Effects of follicle-stimulating hormone and serum substitution on the in-vitro growth of human ovarian follicles. Hum Reprod 1999; 14: 1555–62. 26. 27. 28. Roy SK, Terada DM. Activities of glucose metabolic enzymes in human preantral follicles: in-vitro modulation by follicle-stimulating hormone, luteinizing hormone, epidermal growth factor, insulin-like growth factor I, and transforming growth factor beta1. Biol Reprod 1999; 60: 763–8.

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