abstract
The stabilization of spindle fibersis important for successful vitrification of bovine oocytes because microtubules
and other cytoskeleton fibers (CSF) can be damaged during vitrification, resulting in failure of fertilization
after thawing. Docetaxel, a stabilizing agent, could potentially reduce CSF damage of bovine
oocytes induced during vitrification. However, there have been no reports on the effects of docetaxel
on their vitrification. Experiment 1 was conducted to investigate the effects of various doses of docetaxel
(0.0, 0.05, 0.5, 5.0 and 50 lM) in preincubation medium of in vitro matured (IVM) bovine oocytes on their
developmental ability after in vitro fertilization (IVF). The results show that 0.05 lM docetaxel had no
adverse effect on embryo development, while docetaxel at a concentration of P0.5 lM inhibited development.
Experiments 2 and 3 were conducted to investigate the effects of preincubation of IVM bovine
oocytes with 0.05 lM docetaxel for 30 min prior to vitrification-warming on CSF integrity (Experiment 2),
and on oocyte survival and viability after IVF (Experiment 3). When preincubated with 0.05 lM docetaxel
for 30 min before vitrification, post-thawed oocytes had less CSF damage and higher survival rates compared
with those untreated with docetaxel before vitrification. Surviving oocytes also had higher rates of
cleavage and development to the blastocyst stage after IVF. In conclusion, preincubation of IVM bovine
oocytes with 0.05 lM docetaxel for 30 min before vitrification was effective at preventing CSF damage
during vitrification, and improving oocyte viability after warming and subsequent cleavage and blastocyst
formation after IVF.
abstractThe stabilization of spindle fibersis important for successful vitrification of bovine oocytes because microtubulesand other cytoskeleton fibers (CSF) can be damaged during vitrification, resulting in failure of fertilizationafter thawing. Docetaxel, a stabilizing agent, could potentially reduce CSF damage of bovineoocytes induced during vitrification. However, there have been no reports on the effects of docetaxelon their vitrification. Experiment 1 was conducted to investigate the effects of various doses of docetaxel(0.0, 0.05, 0.5, 5.0 and 50 lM) in preincubation medium of in vitro matured (IVM) bovine oocytes on theirdevelopmental ability after in vitro fertilization (IVF). The results show that 0.05 lM docetaxel had noadverse effect on embryo development, while docetaxel at a concentration of P0.5 lM inhibited development.Experiments 2 and 3 were conducted to investigate the effects of preincubation of IVM bovineoocytes with 0.05 lM docetaxel for 30 min prior to vitrification-warming on CSF integrity (Experiment 2),and on oocyte survival and viability after IVF (Experiment 3). When preincubated with 0.05 lM docetaxelfor 30 min before vitrification, post-thawed oocytes had less CSF damage and higher survival rates comparedwith those untreated with docetaxel before vitrification. Surviving oocytes also had higher rates ofcleavage and development to the blastocyst stage after IVF. In conclusion, preincubation of IVM bovineoocytes with 0.05 lM docetaxel for 30 min before vitrification was effective at preventing CSF damageduring vitrification, and improving oocyte viability after warming and subsequent cleavage and blastocystformation after IVF.
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