Effect of Roscovitine on nuclear maturation, MPF and MAP kinase activity and embryo development of prepubertal goat oocytes
Jiménez y de Macedo, Ana Raquel (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Izquierdo Tugas, Ma. Dolors (Maria Dolors) (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Urdaneta Vargas, Aixa Efrailda (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Anguita Bustamante, Begoña (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Paramio, María Teresa (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)

Fecha:	2006
Resumen:	The low number of embryos obtained from IVM-IVF-IVC of prepubertal goat oocytes could be due to an incomplete cytoplasmic maturation. Roscovitine (ROS) inhibits MPF and MAP kinase activity and maintains the oocyte at Germinal Vesicle (GV) stage. The aim of this study was to determine if meiotic activity is arrested in prepubertal goat oocytes cultured with 0, 12. 5, 25, 50 and 100 m M of ROS for 24 h. A group of oocytes from adult goats was cultured with 25 m M of ROS to compare the effect of ROS on prepubertal and adult goat oocytes. A sample of oocytes was stained to evaluate the nuclear stage at oocyte collection time and after ROS incubation. IVM-oocytes not exposed to ROS formed the control group. Prepubertal goat IVM-oocytes were inseminated and cultured for 8 days. The percentage of oocytes at GV stage, after exposition to ROS was significantly higher in adult goat oocytes (64. 5%) than in prepubertal goat oocytes. No differences were found among 25, 50 and 100 m M ROS concentrations (29, 23 and 26%, oocytes at GV stage, respectively). After 8 days of culture, no differences in total embryos were observed between control oocytes and oocytes treated with 12. 5 and 25 m M (45. 2, 36. 1 and 39. 4%, respectively), however the percentage of lastocysts was higher in the control group. Western blot for the MAPK and p34 cdc2 showed that both enzymes were active in prepubertal goat oocytes after 24 h of ROS exposition. In conclusion, a low percentage of prepubertal goat oocytes reached GV stage after ROS incubation; possibly because most of them had reinitiated the meiosis inside the follicle. ROS did not affect fertilization or total embryos but ROS showed a negative effect on blastocyst development.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Cabres ; Embriologia veterinària ; Goat ; IVF ; Oocytes ; Roscovitine ; MPF ; MAPK
Publicado en:	Theriogenology, Vol. 65, Num. 9 (2006) , p. 1769-1782, ISSN 0093-691X

DOI: 10.1016/j.theriogenology.2005.10.012

Roscovitine 14 p, 213.3 KB

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