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- W2018442011 abstract "In this study a specific inhibitor of cyclin-dependent kinases (cdks), butyrolactone I (BL I), was used for activation of pig and cattle metaphase II (MII) oocytes. BL I at a concentration of 100 microM was able to induce activation of both pig and cattle MII oocytes in a manner dependent on exposure time; however, precise timing of BL I exposure was required for the best activation results. The optimum activation rates were obtained when cattle MII oocytes were treated for 5 h with BL I and subsequently for 3-11 h in control medium, and pig MII oocytes for 8 h in BL I and then for 8-16 h in control medium; the percentage of activated oocytes after such treatment varied between 55% and 74% and between 53% and 81% for cattle and pig oocytes, respectively. Shorter exposures to BL I led to re-entry of the oocytes to the metaphase state in 35-50% of oocytes, the remaining oocytes forming a pronuclear stage; longer exposure to BL I led to increased numbers of oocytes being abnormal or degenerated. The behaviour of histone H1 kinase and mitogen activated protein (MAP) kinase, also measured during the experiment, reflected the morphological changes in the oocytes: both were inactivated after BL I treatment, though the inactivation of histone H1 kinase occurred 2 h ahead of that of MAP kinase. However, in the oocytes treated for a shorter time with BL I, with the reoccurrence of condensed chromatin in proportion of the oocytes cultured in control medium after BL I treatment, both kinases became reactivated. Taken together, these results suggest the possibility of using BL I for activation and cloning experiments in both species." @default.
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- W2018442011 date "2002-02-01" @default.
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- W2018442011 title "Activation of pig and cattle oocytes by butyrolactone I: morphological and biochemical study" @default.
- W2018442011 doi "https://doi.org/10.1017/s0967199402002071" @default.
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