Efeito da adição de butil-hidroxitolueno nos meios de refrigeração e congelação sobre a viabilidade espermática de equinos
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Data
2016-02-26
Autores
Araujo, Endrigo Adonis Braga de [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O processo de criopreservação acarreta estresse oxidativo à célula espermática e a adição de antioxidantes aos meios de refrigeração e congelação de sêmen pode auxiliar na proteção dos espermatozoides contra o dano induzido pelas espécies reativas de oxigênio (ERO), incluindo perda da motilidade de forma irreversível, peroxidação lipídica e fragmentação do DNA, interferindo na capacidade de fertilização do espermatozoide. Dentre os diferentes antioxidantes, o Butil-hidroxitolueno (BHT) é um análogo sintético da vitamina E, cujo efeito protetor é atribuído a dois mecanismos: o aumento da fluidez da membrana plasmática após a incorporação do antioxidante, e o segundo por conter a cascata de peroxidação lipídica pela conversão de peroxil em hidroperóxido lipídico. O BHT foi testado em diversas espécies demonstrando melhora na motilidade, integridade de membrana plasmática e viabilidade espermática; porém, na espécie equina, a inclusão de BHT em diluentes para criopreservação de sêmen necessita ser melhor avaliada. Deste modo, o objetivo deste trabalho foi avaliar a influência do BHT nas células espermáticas de equinos submetidas à criopreservação e sua capacidade de conter a peroxidação lipídica e produção de espécies reativas de oxigênio quando os espermatozoides foram submetidos a estresse.
The process of cryopreservation brings out oxidative stress to spermatic cell and the addition antioxidant of into cooling and freezing semen extenders could assist in protection of spermatozoa against the damage induced by reactive oxygen species (ROS), including irreversible loss in motility, lipid peroxidation and DNA fragmentation, interfering with the fertilizing capacity of sperm. Among different antioxidants, the butylated hydroxytoluene (BHT) is a synthetic analogue of vitamin E, whose protective effect is attributed to two mechanisms: the increase in sperm membrane fluidity after the addition of antioxidant, and the lipid peroxidation cascade for converting peroxy radicals into lipid hydroperoxides. BHT was tested in different species and the results include improvement in motility, spermatic membrane integrity and sperm viability. However, the addition of BHT in horse semen extenders for cryopreservation purposes demands further research. Thereby, the aims of this study were (1) to evaluate the influence of BHT on equine spermatic cells submitted to cryopreservation and (2) the capacity of BHT to contain the lipid peroxidation and the production of reactive species of oxygen when sperm cells were submitted to stress.
The process of cryopreservation brings out oxidative stress to spermatic cell and the addition antioxidant of into cooling and freezing semen extenders could assist in protection of spermatozoa against the damage induced by reactive oxygen species (ROS), including irreversible loss in motility, lipid peroxidation and DNA fragmentation, interfering with the fertilizing capacity of sperm. Among different antioxidants, the butylated hydroxytoluene (BHT) is a synthetic analogue of vitamin E, whose protective effect is attributed to two mechanisms: the increase in sperm membrane fluidity after the addition of antioxidant, and the lipid peroxidation cascade for converting peroxy radicals into lipid hydroperoxides. BHT was tested in different species and the results include improvement in motility, spermatic membrane integrity and sperm viability. However, the addition of BHT in horse semen extenders for cryopreservation purposes demands further research. Thereby, the aims of this study were (1) to evaluate the influence of BHT on equine spermatic cells submitted to cryopreservation and (2) the capacity of BHT to contain the lipid peroxidation and the production of reactive species of oxygen when sperm cells were submitted to stress.
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Antioxidante, BHT, Criopreservação de sêmen, Garanhão, Antioxidants, Semen cryopreservation, Stallion