Abstract
To investigate the developmental competence in vitro of female germ cells in fetal gonads, gonadal ridges of 12.5 days post coitus (dpc) were organ-cultured for 18 days, and then oocyte-granulosa cell complexes (OGCs) were isolated from the cultures. Collected OGCs were further cultured for 11 days. The oocytes grown in vitro reached 64.1 ± 0.4 μm. Transmission electron microscopy analysis showed that oocytes grown in vitro had maintained connection with surrounding somatic cells. Some oocytes resumed meiosis by 1 μM okadaic acid or 10 ng/ml epidermal growth factor (EGF). The oocytes that underwent germinal vesicle breakdown reached 71.3 ± 0.5 μm. This study showed growth and meiotic resumption in vitro of oocytes through the support of ovarian tissue from fetal gonads.
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