Kisspeptina en becerras prepúberes: 2. Respuesta de LH, FSH y GH a distintas dosis de kisspeptina-10 y su asociación con IGF-I y leptina circulantes
DOI:
https://doi.org/10.22319/rmcp.v9i4.4192Palabras clave:
Kisspeptina-10, Becerras prepúberes, LH, FSH, GH, IGF-I, Leptina.Resumen
En becerras prepúberes, la kisspeptina-10 (KISS-10) estimula la liberación de hormona luteinizante (LH) y hormona foliculoestimulante (FSH), pero su acción en la hormona del crecimiento (GH) es inconsistente. La hipótesis fue que en becerras prepúberes la magnitud de liberación de LH, FSH y GH en respuesta a KISS-10 es determinada por la dosis y las concentraciones endógenas de IGF-I y leptina. Se usaron 20 becerras prepúberes (100-232 kg de peso y 7-11 meses de edad), mismas que recibieron un bolo i.v. de 5 o 50 µg de KISS-10/kg de peso. Ambas dosis de KISS-10 indujeron un incremento de LH y FSH, más no de GH. La dosis de 50 µg de KISS-10 indujo un área bajo la curva de LH y una duración del incremento de FSH mayores (P<0.05) que la dosis de 5 µg. IGF-I se relacionó negativamente con el aumento de LH en respuesta a la dosis de 50 µg (P<0.05), pero no estuvo asociado con la respuesta de LH a la dosis de 5 µg de KISS-10. La magnitud del incremento de FSH y las concentraciones de GH posteriores a KISS-10 no fueron alteradas por las concentraciones de IGF-I (P>0.05). De la misma forma, las concentraciones de leptina no determinaron (P>0.05) la magnitud del incremento de LH y FSH ni las concentraciones de GH pos tratamiento. En conclusión, la GH no respondió a ninguna dosis, pero la FSH y la LH fueron sensibles al aumento de dosis de KISS-10. Además, la magnitud de respuesta de LH a KISS-10 fue determinada por las concentraciones endógenas de IGF-I, pero no de leptina.
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