https://doi.org/10.18502/ijrm.v19i4.9063
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authors
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Mehdi Azari
Mehdi Azari
Department of Anatomical Sciences, School of Medicine, AJA University of Medical Sciences, Tehran, Iran
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Mojtaba Kafi
Mojtaba Kafi
Department of Animal Reproduction, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
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Anise Asaadi
Anise Asaadi
Department of Animal Reproduction, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
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Zohreh Pakniat
Zohreh Pakniat
Department of Animal Reproduction, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
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Beheshteh Abouhamzeh
Beheshteh Abouhamzeh
Department of Anatomical Sciences, School of Medicine, AJA University of Medical Sciences, Tehran, Iran
Published Date
- Apr 22, 2021
Bovine oocyte developmental competence and gene expression following co-culturing with ampullary cells: An experimental study
Abstract
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.
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