<i>In Vitro</i> Growth and Maturation of Vitrified-Warmed Bovine Oocytes Collected from Early Antral Follicles

Abstract

Abstract. Cryopreservation of growing oocytes enriches the choice of timing and location of artificial embryo production. However, completion of oocyte growth after warming is crucial when using such cryopreserved oocytes. Our research objective was to develop a sequential system that incorporates cryopreservation of growing bovine oocytes and their subsequent in vitro growth. Oocyte-granulosa cell complexes with a mean oocyte diameter of approximately 100 µm were vitrified-warmed and then cultured for 14 days. The percentage of surviving oocytes following cryopreservation and 14-day culture was approximately 80%. More than half of the surviving oocytes were capable of maturing to metaphase II after in vitro maturation; the rate was comparable to that of control oocytes grown in vitro without cryopreservation. Taken together, the combined protocols for vitrification-warming of growing oocytes and subsequent in vitro growth can produce oocytes capable of undergoing meiotic maturation.

Differentiation of Mouse Primordial Germ Cells into Functional Oocytes In Vitro

“…Meiotically mature oocytes are successfully developed by the culture of preantral follicles, oocyte-granulosa complexes, or ovarian pieces in human, bovine, sheep, and pig. 8 , 14 , 38 , 65 , 70 , 103 However, in vitro systems have poor outcomes depending on the length of the culture period required for the completion of oogenesis. Among mammals, mouse oocytes with proven fertility have been successfully produced from early-stage oocytes at comparably high efficiency in vitro .…”