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Effect of α-Tocopherol on Viability, Lipid Peroxidation and Oxidative Stress of Cryopreserved Ovine Preantral Follicle

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Kalpana Kaushik — Department of Biotechnology, Jain University, Bengaluru, Karnataka, India
Johnson Pulukuri — ICAR-National Institute of Animal Nutrition and Physiology, Bengaluru, India.
NikhilK Tej — ICAR-National Institute of Animal Nutrition and Physiology, Bengaluru, India.
Kavya Krishna — ICAR-National Institute of Animal Nutrition and Physiology, Bengaluru, India.
Paluru S.P. Gupta — ICAR-National Institute of Animal Nutrition and Physiology, Bengaluru, India.
Sumanta Nandi — ICAR-National Institute of Animal Nutrition and Physiology, Bengaluru, India.
Sukanta Mondal — ICAR-National Institute of Animal Nutrition and Physiology, Bengaluru, India.
Published 7 Nov 2022 Vol. 18 No. 5 (2022), pp. 24-28 ● Open access
❝ How to cite 🔗 https://doi.org/10.48165/ijvsbt.18.5.05
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Abstract

Vitrification of preantral follicles is a promising technique to preserve female fertility. The aim of the present study was to evaluate the effect of supplementation of α-tocopherol in the vitrification solution on the viability, lipid peroxidation and mRNA expression of superoxide dismutases (SOD1 and SOD2) in vitrified cultured ovine preantral follicles at day-6 and day-12. Preantral follicles (200-300 µm) were isolated from the ovine ovaries by the mechanical method and were distributed separately to the vitrification medium supplemented with 10 mM and 20 mM of α-tocopherol.  After a week, the follicles were thawed and analyzed for follicular viability by trypan blue dye exclusion method and subjected to in vitro culture (IVC) for 6 and 12 days. Our results revealed that the significant increase (p<0.05) of viability in 20 mM α-tocopherolsupplemented vitrified group when compared to the vitrified without α-tocopherol group. On day-6 of IVC, malondialdehyde (MDA) concentration was significantly(p<0.05) higher in vitrified group without α-tocopherol in comparison to vitrified supplemented with 20 mM of α-tocopherol and control fresh groups. However, no significant difference in MDA content was found among the groups at day-12. The mRNA expression level of SOD1 at day-6 was significantly (p<0.05) higher in vitrified with 20 mM of α-tocopherol and control fresh groups compared to the vitrified without α-tocopherol and with10 mM α-tocopherol groups. The expression pattern of SOD2 was significantly (p<0.05) higher in control fresh group compared to the other groups at day-6 and day-12 of IVC.We conclude that lowering the vitrification-induced lipid peroxidation of preantral follicles by α-tocopherol at 20 mM concentration may be mediated by increasing SOD expression during IVC.

KeywordsOvaryPreantral folliclesVitrificationα-tocopherolSheepGene

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