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Alves SVP, da Costa EP, Queiroz-Castro VLD, Machado-Neves M, Guimarães JD, Gomes LL, Azevedo Junior MA, Júnior AS. Bovine herpesvirus 1 can impact the bovine oocyte development during in vitro maturation. Res Vet Sci 2018; 123:135-140. [PMID: 30641473 DOI: 10.1016/j.rvsc.2018.12.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/08/2018] [Accepted: 12/31/2018] [Indexed: 12/11/2022]
Abstract
Bovine herpesvirus 1 (BoHV-1) disseminates easily, is difficult to control, and is widely spread in cattle herds worldwide. BoHV-1 causes a broad range of losses to the cattle industry, mainly concerning reproduction. Previous studies involving experimental infection of BoHV-1 in an in vitro embryo production system have reported impairment of embryonic development by BoHV-1. In this study, we evaluated the interference of BoHV-1 in the in vitro maturation system of cumulus-oocyte complexes (COCs) and denuded oocytes (DOs) cultured with a cumulus cell suspension. Blood samples and ovaries were collected from slaughterhouse cows unvaccinated against BoHV-1. Using virus neutralization assays, the seropositive animals were classified according to their antibody titers. The oocytes were recovered by follicular aspiration and divided into two groups, COCs and DOs, which were evaluated for their nuclear maturation capacity using immunofluorescence assays by laser scanning confocal microscopy. Two experiments were carried out: (I) in vitro maturation of COCs and DOs after artificial infection of seronegative animals and (II) in vitro maturation of COCs and DOs of seropositive animals. In experiment I, a difference (P < 0.01) was observed between the maturation rates of the control group COCs (78.2%) and the infected COCs (43.6%). In experiment II, there was a difference (P < 0.01) in the maturation rate between animals with antibody titers ≥16 (56.9%) and the control group (79.4%). Immunofluorescence assays identified BoHV-1 in the COCs and DOs. Therefore, it was concluded that BoHV-1 affects the in vitro maturation process in both in vitro and natural infections.
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Affiliation(s)
- Saullo V P Alves
- Department of Veterinary, Division of Animal Reproduction, Laboratory of Oocyte Maturation and in vitro Fertilization, Federal University of Vicosa (Universidade Federal de Vicosa-UFV), Vicosa, Minas Gerais, Brazil.
| | - Eduardo P da Costa
- Department of Veterinary, Division of Animal Reproduction, Laboratory of Oocyte Maturation and in vitro Fertilization, Federal University of Vicosa (Universidade Federal de Vicosa-UFV), Vicosa, Minas Gerais, Brazil.
| | - Vanessa L D Queiroz-Castro
- Department of Veterinary, Division of Animal Reproduction, Laboratory of Oocyte Maturation and in vitro Fertilization, Federal University of Vicosa (Universidade Federal de Vicosa-UFV), Vicosa, Minas Gerais, Brazil.
| | - Mariana Machado-Neves
- Department of General Biology, Laboratory of Structural Biology, UFV, Vicosa, Minas Gerais, Brazil.
| | - José D Guimarães
- Department of Veterinary, Division of Animal Reproduction, Laboratory of Oocyte Maturation and in vitro Fertilization, Federal University of Vicosa (Universidade Federal de Vicosa-UFV), Vicosa, Minas Gerais, Brazil.
| | - Lidiane L Gomes
- Department of Veterinary, Division of Animal Reproduction, Laboratory of Oocyte Maturation and in vitro Fertilization, Federal University of Vicosa (Universidade Federal de Vicosa-UFV), Vicosa, Minas Gerais, Brazil
| | - Marcos A Azevedo Junior
- Department of Veterinary, Division of Animal Reproduction, Laboratory of Oocyte Maturation and in vitro Fertilization, Federal University of Vicosa (Universidade Federal de Vicosa-UFV), Vicosa, Minas Gerais, Brazil.
| | - Abelardo Silva Júnior
- Department of Veterinary, Division of Preventive Medicine and Public Health, Laboratory of Animal Virology, UFV, Vicosa, Minas Gerais, Brazil.
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