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Pre-fertilization approach using α-l-fucosidase modulates zona pellucida hardening during bovine in vitro embryo production

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Abstract

The polyspermy occurrence is considerably lower under in vivo compared to in vitro embryo culture conditions, suggesting that the presence of some factors in the maternal environment is responsible for this. The α-L-fucosidase (FUCA) is a natural glycosidase present in the oviductal fluid, therefore, this study aimed at investigating the effect of adding FUCA to the hardening of the zona pellucida (ZP), polyspermy control, and embryonic yield and quality of bovine blastocysts produced in vitro. In the first experiment, the effect of FUCA (0.125 U/mL) was evaluated during the entire in vitro fertilization (IVF). However, it was demonstrated to be embryotoxic by completely inhibiting the blastocyst formation. In the second experiment, the FUCA (0.125 U/mL) was tested as short-term incubation before IVF (pre-fertilization step) for 30 min or 2 h, which demonstrated that FUCA treatment for 30 min resulted in ZP hardening. In the third experiment, a pre-fertilization FUCA treatment (1 h) at different concentrations (0, 0.0625, and 0.125 U/mL) showed that FUCA (0.0625 U/mL) improved pre-fertilization ZP hardening and tended to increase monospermic fertilization rates but did not improve embryo yield and quality. Together, it has been demonstrated that FUCA can induce oocyte pre-fertilization ZP hardening and might improve monospermic fertilization performance, and this effect is dependent on both variables (protein concentration and incubation time).

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The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

This study was supported by the São Paulo Research Foundation (FAPESP – grant numbers: # 2019/12223-0, # 2016/25685-4, and #2018/06674-7). It was also financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior e Brasil (CAPES) e Finance Code 001.

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PKF and ACSC designed the research. TSBM, TRCS, FFF, PHS, EMR, SGN, and PKF collected the samples and performed the investigation and formal analysis. TSBM, TRCS, and PKF wrote the original draft. ACSC acquired and administrated the funding. ACSC and PKF supervised. PKF manuscript review and edition. All authors reviewed, read, and approved the manuscript.

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Correspondence to Patricia Kubo Fontes.

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Manssur, T.S.B., Sebastião, T.R.C., Franchi, F.F. et al. Pre-fertilization approach using α-l-fucosidase modulates zona pellucida hardening during bovine in vitro embryo production. Vet Res Commun 48, 1135–1147 (2024). https://doi.org/10.1007/s11259-023-10291-y

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  • DOI: https://doi.org/10.1007/s11259-023-10291-y

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