RESUMO
Tritrichomonas fetus causes infertility and abortion in cattle; however, there is scarce information regarding the susceptibility of bovine sperm to this parasite. The objective of this study was to analyze in vitro the interaction between T. fetus and bovine sperm and to evaluate the effect of extracellular products secreted by the parasite on these reproductive cells. Sperm from five fertile bulls (Bos taurus taurus, Holstein-Friesian), selected through a Percoll gradient, adhered to T. fetus after 30min of interaction, resulting in agglutination between the two kinds of cells. Based on reverse transcription-polymerase chain reaction (RT-PCR), T. fetus continuously expressed its gene for cysteine peptidase in the presence or absence of sperm. Computer-assisted semen analysis (CASA) revealed that, after 1h incubation of sperm in T. fetus culture extract, the extracellular products secreted by the parasite decreased sperm progressive motility (P<0.05). Although T. fetus extracellular products did not lead to loss of sperm viability (P<0.05) based on the Annexin-V/propidium iodide assay, the percentage of Annexin-V fluorescein isothiocyanate-positive and propidium iodide-positive cells increased (P<0.05) during incubation of sperm in T. fetus culture extract, consistent with cellular damage. In conclusion, extracellular products secreted by T. fetus were cytotoxic to bovine sperm, as they decreased sperm progressive motility; perhaps this contributes to the pathogenesis of T. fetus-induced infertility.
Assuntos
Motilidade dos Espermatozoides , Espermatozoides/parasitologia , Tritrichomonas foetus/fisiologia , Animais , Bovinos , Masculino , Tritrichomonas foetus/metabolismoRESUMO
A expansão da criação de ovinos tem representado uma oportunidade no avanço dos estudos referentes às Biotécnicas de Reprodução Assistidas em ovinos. Como principal objetivo deste trabalho está uma análise dos principais gargalos tecnológicos à aplicação da Reprodução Assistida na espécie ovina. Serão ainda abordados princípios básicos que podem ser úteis à adoção de estratégias visando à superação desses entraves.
The expansion of the creation of sheep has represented an opportunity in the advancement of studies related to Biotechnology of Assisted Reproduction in sheep. The main objective of this study is an analysis of the major technological bottlenecks to the implementation of Assisted Reproduction in sheep. Basic principles that may be useful to adopt strategies aimed at overcoming these barriers will be approached.
Assuntos
Animais , Ovinos/crescimento & desenvolvimento , Ovinos/embriologia , Ovinos/genética , Técnicas de Reprodução Assistida/veterináriaRESUMO
A expansão da criação de ovinos tem representado uma oportunidade no avanço dos estudos referentes às Biotécnicas de Reprodução Assistidas em ovinos. Como principal objetivo deste trabalho está uma análise dos principais gargalos tecnológicos à aplicação da Reprodução Assistida na espécie ovina. Serão ainda abordados princípios básicos que podem ser úteis à adoção de estratégias visando à superação desses entraves. (AU)
The expansion of the creation of sheep has represented an opportunity in the advancement of studies related to Biotechnology of Assisted Reproduction in sheep. The main objective of this study is an analysis of the major technological bottlenecks to the implementation of Assisted Reproduction in sheep. Basic principles that may be useful to adopt strategies aimed at overcoming these barriers will be approached. (AU)