Activin-A receptor expression patterns in prepubertal goat oocytes and derived embryos

Area of Science:

• Reproductive Biology
• Developmental Biology
• Molecular Endocrinology

Background:

• Activin receptors are crucial signaling molecules in cellular processes.
• Understanding receptor expression in goat oocytes and embryos is vital for reproductive efficiency.

Purpose of the Study:

• To investigate the presence and localization of activin IIA and IIB receptors (ActR-IIA and ActR-IIB) in prepubertal goat oocytes and embryos.
• To determine the role of these receptors in oocyte maturation and early embryonic development.

Main Methods:

• Western blotting was used to detect the synthesis of activin receptors.
• Immunocytochemistry was employed to visualize receptor localization in oocytes and embryos at different developmental stages.

Main Results:

• Activin receptors are synthesized during oocyte maturation and embryo development in goats.
• Both ActR-IIA and ActR-IIB were detected in cleaved embryos, with differential localization in blastocysts (ActR-IIA in inner cell mass and trophectoderm; ActR-IIB mainly in inner cell mass).
• No receptor expression was observed in immature oocytes, but they were present in in vitro matured oocytes.

Conclusions:

• Activin type II receptors are present in in vitro matured prepubertal goat oocytes and blastocyst-stage embryos.
• The differential expression of ActR-IIA and ActR-IIB suggests distinct roles in blastocyst cell lineages.
• Activin receptor expression patterns may be key factors in distinguishing competent from incompetent oocytes, offering insights into improving assisted reproductive technologies.