Volume 59, Issue 8 e14701
ORIGINAL ARTICLE

Chemical gasification: An alternative approach to in vitro maturation of bovine oocytes

David L. Gómez-López

David L. Gómez-López

Colombian Corporation of Agricultural Research (Corporación Colombiana de Investigación Agropecuaria – AGROSAVIA), Research Center Tibaitatá, Mosquera, Colombia

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Diego A. Velasco-Acosta

Diego A. Velasco-Acosta

Colombian Corporation of Agricultural Research (Corporación Colombiana de Investigación Agropecuaria – AGROSAVIA), Research Center Tibaitatá, Mosquera, Colombia

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Aldemar Chávez-Rodríguez

Aldemar Chávez-Rodríguez

Private Practice, Bogotá, Colombia

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Augusto Schneider

Augusto Schneider

Federal University of Pelotas (Universidade Federal de Pelotas), Pelotas, RS, Brazil

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Juan F. Rocha

Juan F. Rocha

Colombian Corporation of Agricultural Research (Corporación Colombiana de Investigación Agropecuaria – AGROSAVIA), Research Center Tibaitatá, Mosquera, Colombia

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Diego F. Dubeibe-Marín

Corresponding Author

Diego F. Dubeibe-Marín

Faculty of Agricultural Sciences, University of Applied and Environmental Sciences (Universidad de Ciencias Aplicadas y Ambientales – UDCA), Bogotá, Colombia

Correspondence

Diego F. Dubeibe-Marín, Calle 222 N° 55 – 37, Bogotá 111166, Colombia.

Email: [email protected]

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First published: 07 August 2024

Abstract

This study aimed to evaluate the effect of chemical gasification and HEPES as alternative systems to pH control during in vitro maturation on bovine oocytes competence. Groups of 20 bovine cumulus oocytes complexes (COCs) were randomly distributed and cultured for 24 h in one of the following experimental groups: (i) chemical reaction (ChRG) system: CO2 generated from sodium bicarbonate and citric acid reaction (ii) culture media TCM-HEPES (HEPES-G); and (iii) control group (CNTG) in conventional incubator. After in vitro maturation (IVM), the COCs were in vitro fertilized (IVF), and in vitro cultivated (IVC) in a conventional incubator. We evaluated oocyte nuclear maturation, cleavage and blastocyst rates, in addition to the relative mRNA expression of BAX, BMP-15, AREG and EREG genes in oocytes and cumulus cells. The proportion of oocytes in metaphase II was higher in CNTG and ChRG (77.57% and 77.06%) than in the HEPES-G (65.32%; p = .0408 and .0492, respectively). The blastocyst production was similar between CNTG and ChRG (26.20% and 28.47%; p = .4232) and lower (p = .001) in the HEPES-G (18.71%). The relative mRNA expression of BAX gene in cumulus cells was significantly higher (p = .0190) in the HEPES-G compared to the CNTG. Additionally, the relative mRNA expression of BMP-15 gene was lower (p = .03) in oocytes from HEPES-G compared to the CNTG. In conclusion, inadequate atmosphere control has a detrimental effect on oocyte maturation. Yet, the use of chemical gasification can be an efficient alternative to bovine COCs cultivation.

CONFLICT OF INTEREST STATEMENT

None.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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