Las proteínas del plasma seminal incrementan la viabilidad espermática post-descongelación del semen de toros Sanmartinero

Las proteínas del plasma seminal incrementan la viabilidad espermática post-descongelación del semen de toros Sanmartinero

RESUMEN

Objetivo. El objetivo de este trabajo fue evaluar el efecto de la adición de proteínas del plasma seminal sobre el porcentaje de espermatozoides bovinos viables post-descongelación. Materiales y métodos. Los espermatozoides se congelaron usando dos medios (citrato-fructosa-yema y Bioxcell®) y la obtención de proteínas de plasma seminal de bajo peso molecular se realizó por medio de cromatografía líquida de baja presión. Las proteínas de interés eluyeron en las fracciones 21-25 y se sometieron a electroforésis en una y dos dimensiones. Los espermatozoides se incubaron a 37°C durante una hora, con 0.5, 1.0, 1.5 y 2.0 mg de la fracción 21-25. Se incluyeron dos tratamientos adicionales: uno con proteínas totales del plasma seminal y otro sin proteína. Resultados. La electroforésis bidimensional de las fracciones confirmó la presencia de siete puntos de proteína de bajo peso molecular (14-16 kDa y punto Isoeléctrico de 5.0 - 5.5). La adición de estas proteínas aumentó 20% (p<0.05), el porcentaje de espermatozoides viables post-descongelación en muestras congeladas en medio citrato-fructosa-yema (con dosis de 1 ó 1.5 mg de proteína/106 espermatozoides), y 25% (p<0.05) en muestras congeladas en medio Bioxcell® (con dosis de 0.5 mg de proteína/106 espermatozoides). Conclusiones. Los resultados de esta investigación sugieren el posible uso de proteínas de bajo peso molecular del plasma seminal, para disminuir el efecto deletéreo de la criopreservación en los espermatozoides

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