55 IN VITRO DEVELOPMENT OF ENUCLEATED DOMESTIC CAT OOCYTES RECONSTRUCTED WITH SKIN FIBROBLASTS OF DOMESTIC AND LEOPARD CATS

The domestic cat is a valuable model for studies in assisted reproductive technology in felid species. Therefore, in this experiment we evaluated the in vitro developmental potential of enucleated domestic cat oocytes reconstructed with somatic cells from domestic and leopard cats. Skin fibroblasts were isolated from female domestic and leopard cats. The oocytes were collected by aspiration of follicles from ovaries that were superovulated with 200 IU PMSG. In vitro-matured oocytes were enucleated and individual donor cells (diameter 14–16 µm) were inserted into the perivitelline space of the enucleated oocyte. Fusion was performed at 26–27 h post-maturation by placing a cell-oocyte couplet between both tips of the needle electrode and electrostimulating with a 2-DC pulse (30 V, 30 µs) in fusion medium containing 0.3 M Mannitol + 0.1 mM MgCl2. Activation was performed 1 to 2 h post-fusion by incubation in 7% ethanol at room temperature for 5 min followed by cultured in 10 µg mL-1 cycloheximide and 1.25 µg mL-1 cytochalasin D at 38°C in 5% O2, 5% CO2, 90% N2 conditions. After activation, the reconstructed embryos were cultured in 100-µL droplets of Tyrode’s medium (Gomez et al., 2003 Theriogenology 60, 239–251.) supplemented with 0.3% BSA at 38°C in a 5% O2, 5% CO2, 90% N2 environment for 2 d. Then, 8-cell embryos were cultured in 100-µL droplets of Tyrode’s medium supplemented with 10% FCS at 38°C in a 5% O2, 5% CO2, 90% N2environment for 5 d. The cleavage rates of oocytes reconstructed with either donor cell types were not different. The percentages of blastocyst formation from parthenogenotes and nuclear transfer embryos derived from domestic cat fibroblasts (8/56, 14.3% and 7/51, 13.7%, respectively) were significantly higher than that for nuclear transfer embryos constructed with leopard cat fibroblasts (3/45, 6.7%). These results indicate that enucleated domestic cat oocytes reconstructed with skin fibroblasts of leopard cats can develop to the blastocyst stage. This experiment was supported by Suranaree University of Technology. Table 1 In vitro development of domestic cat oocytes reconstructed with domestic and leopard skin fibroblasts and parthenogenetic activation

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