Effect of follicle size and dibutyryl cAMP on the cAMP content and gap junctional communication of porcine prepubertal cumulus–oocyte complexes during IVM
2009
Bagg, Melanie A. | Nottle, MarkB. | Armstrong, DavidT. | Grupen, Christopher G.
The lower ability of oocytes from prepubertal pigs to yield viable embryos than those from adult pigs appears, in part, a consequence of their reduced ability to accumulate cAMP during IVM. The present study examined the cAMP content of oocytes and cumulus-oocyte complexes (COCs), cumulus expansion and gap junctional communication (GJC) in COCs from 3- and 5-8-mm follicles during IVM. The effect of 1 mm dibutyryl cAMP (db-cAMP) treatment for the first 22 h of IVM was also examined for both follicle size classes. The cAMP concentration of oocytes from 5-8-mm follicles was threefold greater than that in oocytes from 3-mm follicles following 11 h of IVM (11.9 ± 5.9 v. 3.6 ± 1.8 fmol, respectively; P 0.05). Dibutyryl cAMP had no effect on the cAMP content, cumulus expansion or GJC of the whole COC. In conclusion, the results of the present study demonstrate that COCs from 3-mm follicles accumulate less intraoocyte and inter-COC cAMP, display lower cumulus expansion and maintain their cumulus cell-oocyte GJC for longer during IVM than do COCs from 5-8-mm follicles.
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