TY - JOUR AU - Mehdi Azari AU - Mojtaba Kafi AU - Anise Asaadi AU - Zohreh Pakniat AU - Beheshteh Abouhamzeh PY - 2021/04/22 Y2 - 2024/03/30 TI - Bovine oocyte developmental competence and gene expression following co-culturing with ampullary cells: An experimental study JF - International Journal of Reproductive BioMedicine (IJRM) JA - IJRM VL - 19 IS - 4 SE - Articles DO - 10.18502/ijrm.v19i4.9063 UR - https://knepublishing.com/index.php/ijrm/article/view/9063 AB - Background: There is no sufficient information on the impact of bovine ampullary oviductal epithelial cells (BAOECs) on in vitro oocyte maturation competence and gene expression.Objective: This study aimed to examine the oocyte developmental competence following co-culturing with a monolayer of fresh and frozen-thawed ampullary cells.Materials and Methods: Bovine cumulus-oocyte complexes (COCs) were distributed into three groups: control group; where in COCs were cultured in cell-free media for 24 hr and FML and FTML groups in which the COCs were cultured in maturation media for 18 hr and then transferred into a media containing fresh and frozen-thawed BAOECs monolayer, respectively (BAOECs were extracted from the oviducts of slaughtered cattle and were then cultured freshly or frozen-thawed) for a further 6 hr. After 24 hr, the expanded COCs were evaluated for nuclear maturation, fertilization rate, and gene expression (GDF9, StAR, CASP3, and FSHr).Results: Nuclear maturation rate in the FTML group was significantly higher than the control group (p = 0.02). The fertilization rate of FTML group was significantly higher than the control and FML groups (p = 0.05 and p = 0.03, respectively). In terms of gene expression, GDF9 were upregulated in the presence of the BAOECs during the last 6 hr of the in vitro maturation (p < 0.001). Furthermore, the expression of the StAR gene in the FTML group was higher than the other groups (p = 0.02). Conclusion: Ampullary cells co-culturing (especially frozen-thawed cells) for in vitro maturation of bovine oocytes yields encourages the results and demonstrates the beneficial effect of co-culture on gene expression and developmental competence.Key words: Ampulla, Bovine, Fertilization, Gene expression, IVM. ER -