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El papel de la hormona del crecimiento en la síntesis de globulina alfa 2u: un nuevo examen
Cell
|January 1, 1982
Resumen
La hormona del crecimiento es esencial para mantener la síntesis de globulina alfa 2u y los niveles de ARNm en ratas macho adultas. Los factores pituitarios durante la pubertad también son cruciales para la óptima expresión génica de la alfa 2u globulina.
Área de la Ciencia:
- Endocrinología Endocrinología.
- Biología Molecular Biología Molecular
- Hepatología Hepatología.
Sus antecedentes:
- La hipofisiectomía en ratas macho adultas elimina la síntesis de globulina alfa 2u.
- Estudios anteriores sugirieron que el papel de la hormona del crecimiento era únicamente traslacional, no afectando los niveles de ARNm.
Objetivo del estudio:
- Para reexaminar el papel de la hormona del crecimiento en la síntesis de globulina alfa 2u.
- Para investigar el impacto de la hormona del crecimiento en los niveles de alfa 2u globulina de ARNm y la traducción.
- Para explorar la influencia de los factores de la hipófisis puberal en la expresión génica de la globulina alfa 2u.
Principales métodos:
- Utilizó una sonda clonada de cDNA de alfa 2u globulina para la cuantificación del ARNm.
- Se midieron los niveles de ARNm de alfa 2u globulina a través de la hibridación.
- Se evaluó la síntesis de proteínas utilizando el marcado de pulsos in vivo y la traducción libre de células.
Principales resultados:
- La hormona del crecimiento es necesaria para mantener los niveles hepáticos en estado estacionario de alfa 2u globulina y su ARNm.
- El ARNm alfa 2u globulina presente sin la hormona del crecimiento se traduce de manera eficiente.
- La hipofisiectomía prepubescente perjudica significativamente la restauración de los niveles de ARNm de alfa 2u globulina en comparación con la hipofisiectomía en adultos.
Conclusiones:
- La hormona del crecimiento regula la síntesis de globulina alfa 2u a nivel de la transcripción, no de la traducción.
- Un factor pituitario no identificado durante la pubertad potencia la expresión génica de la globulina alfa 2u.
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