Effect of co-culturing with embryonic fibroblasts on IVM, IVF and IVC of canine oocytes

Theriogenology
S HatoyaT Inaba

Abstract

We studied the effects of mouse embryonic fibroblasts (MEF) and canine embryonic fibroblasts (CEF) on IVM, IVF and IVC of canine oocytes. Cumulus-oocyte complexes were harvested from ovaries by slicing, and in vitro maturation was evaluated in three different conditions: culture media only (control), co-culture with MEF, or co-culture with CEF. The oocytes were cultured for 48 or 72 h. Only oocytes larger than 100 microm in diameter with a homogeneous dark cytoplasm and two or more layers of cumulus cells were used. The culture medium was TCM 199+10% fetal bovine serum (FBS) with 100 IU/mL penicillin and 100 microg/mL streptomycin. After 48 h of IVM, the oocytes were fertilized in vitro with fresh canine spermatozoa that had been selected by a swim-up method, and the oocytes and spermatozoa were co-cultured in modified Krebs-Ringer bicarbonate solution (TYH) for up to 20 h in 5% CO2 in air at 38.5 degrees C. After insemination, oocytes were transferred to three different conditions (the same as for IVM) and were cultured. After 48 or 72 h of maturation in vitro, the maturation rate of MII oocytes cultured in co-culture of MEF and CEF was higher than for oocytes cultured in control (P<0.05). Although the rate that reached the MI...Continue Reading

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Citations

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