Influência dos danos oxidativos na qualidade espermática em bovinos de diferentes idades
Arquivos
Data
2013-07-12
Autores
Trevizan, Juliane Teramachi [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
O estudo teve por objetivo avaliar o sêmen criopreservado de touros da raça Nelore de diferentes idades e verificar se a qualidade espermática declina com o avanço da idade e se geração espontânea intracelular de superóxido, peroxidação lipídica e danos no DNA estão envolvidos neste processo em decorrência da susceptibilidade ao estresse oxidativo durante o envelhecimento. Para isso, foram utilizados três ejaculados de 40 touros, subdivididos em três faixas etárias: Jovens de 1,8 a 2 anos (n= 27 partidas), Adultos de 3,5 a 7,0 anos (n= 52 partidas) e Senis de 8,0 a 14,3 anos (n= 34). Os touros jovens apresentaram altos valores de motilidade, integridade da membrana e acrossoma e de alto potencial mitocondrial comparado com touros adultos e senis (p<0,05). Houve correlação positiva entre a idade e os parâmetros considerados indesejáveis tais como baixo potencial mitocondrial, membrana lesada, acrossoma lesado e danos oxidativos no DNA (p<0,05) e negativa com alto potencial mitocondrial, membrana íntegra e acrossoma íntegro (p<0,05), indicando redução da qualidade espermática com o envelhecimento. A geração de superóxido, peroxidação lipídica (BodipyC11581/591) não apresentou diferença significativa entre a idade e os parâmetros referentes à qualidade espermática (p>0,05). A concentração de TBARS foi menor em touros jovens quando comparado aos adultos, mas diferenças não foram observadas em touros senis (p>0,05). Danos oxidativos no DNA correlacionaram negativamente com a variável membrana e acrossoma íntegro (r= 0,33, p<0,03) e positivamente com os valores de baixo potencial mitocondrial (r= 0,38, p<0,01). A qualidade espermática declina com o avanço da idade e não está relacionada com a geração de superóxido e peroxidação lipídica (TBARS e BodipyC11581/591) no sêmen criopreservado. No entanto, alta porcentagem de danos oxidativos no DNA no sêmen...
The aim of this study was to evaluate sperm quality of frozen-thawed semen samples of Nelore Bulls of different ages and verify if the quality declines with age and if it is associated with the spontaneous generation of intracellular superoxide, lipid peroxidation and DNA damage. 40 bulls were divided into three age groups: Young 1,8 to 2 years (n = 27 samples), Adults 3.5 to 7.0 years (n = 52 samples) and Senile , from 8 to 14.3 years (n = 34 samples). Young bulls showed higher values of motility, membrane integrity and acrosome and high mitochondrial potential compared to adults and senile bulls (P <0.05). There was a positive correlation between age and undesirable parameters such as low mitochondrial potential , damaged membrane, damaged acrosome and oxidative DNA damage (P<0.05). There was also a negative correlation with high potential mitochondrial, membrane integrity and acrosome integrity (P<0.05). These results indicate a reduction in sperm quality with aging. The generation of superoxide and lipid peroxidation (BodipyC11581/591) showed no significant differences between age and parameters related to sperm quality (P>0.05). The TBARS concentration was lower in young bulls compared to adults, but no differences were observed in senile bulls (P>0.05). Oxidative DNA damage correlated negatively with membrane and acrosome integrity (r = 0.33, P<0.03) and positively with low mitochondrial potential (r = 0.38, P<.01). The sperm quality declines with aging and is not related to superoxide generation and lipid peroxidation (TBARS and BodipyC11581/591) in frozen semen. However, high percentage of oxidative DNA damage indicates the involvement of other ROS (reactive oxygen species) which reduces sperm quality and increases susceptibility to oxidative stress during aging
The aim of this study was to evaluate sperm quality of frozen-thawed semen samples of Nelore Bulls of different ages and verify if the quality declines with age and if it is associated with the spontaneous generation of intracellular superoxide, lipid peroxidation and DNA damage. 40 bulls were divided into three age groups: Young 1,8 to 2 years (n = 27 samples), Adults 3.5 to 7.0 years (n = 52 samples) and Senile , from 8 to 14.3 years (n = 34 samples). Young bulls showed higher values of motility, membrane integrity and acrosome and high mitochondrial potential compared to adults and senile bulls (P <0.05). There was a positive correlation between age and undesirable parameters such as low mitochondrial potential , damaged membrane, damaged acrosome and oxidative DNA damage (P<0.05). There was also a negative correlation with high potential mitochondrial, membrane integrity and acrosome integrity (P<0.05). These results indicate a reduction in sperm quality with aging. The generation of superoxide and lipid peroxidation (BodipyC11581/591) showed no significant differences between age and parameters related to sperm quality (P>0.05). The TBARS concentration was lower in young bulls compared to adults, but no differences were observed in senile bulls (P>0.05). Oxidative DNA damage correlated negatively with membrane and acrosome integrity (r = 0.33, P<0.03) and positively with low mitochondrial potential (r = 0.38, P<.01). The sperm quality declines with aging and is not related to superoxide generation and lipid peroxidation (TBARS and BodipyC11581/591) in frozen semen. However, high percentage of oxidative DNA damage indicates the involvement of other ROS (reactive oxygen species) which reduces sperm quality and increases susceptibility to oxidative stress during aging
Descrição
Palavras-chave
Bovino - Semen, Touro, Preservação do sêmen, DNA, Stress oxidativo, Oxidative stress
Como citar
TREVIZAN, Juliane Teramachi. Influência dos danos oxidativos na qualidade espermática em bovinos de diferentes idades. 2013. xvii, 44 p. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, 2013.