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Identificación de los ligandos para DAF-12 que gobiernan la formación de dauer y la reproducción en C. elegans
Daniel L Motola1, Carolyn L Cummins, Veerle Rottiers
1Howard Hughes Medical Institute and Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA.
Cell
|March 15, 2006
Resumen
Los científicos descubrieron nuevas hormonas esteroides en C. elegans, llamadas ácidos dafachrónicos, que regulan el desarrollo y el metabolismo al unirse al receptor DAF-12, revelando mecanismos conservados en los humanos.
Área de la Ciencia:
- Endocrinología Molecular La Endocrinología Molecular
- Biología del desarrollo Biología del desarrollo.
- Nematología Nematología.
Sus antecedentes:
- El receptor nuclear huérfano de C. elegans DAF-12 controla los procesos clave del desarrollo y el metabolismo.
- Se conoce la regulación hormonal de DAF-12, pero su ligando específico permaneció sin identificar.
Objetivo del estudio:
- Para identificar el ligando endógeno para el receptor nuclear DAF-12 de C. elegans.
- Para dilucidar el mecanismo molecular de la activación de DAF-12 y su papel en el desarrollo de nematodos.
Principales métodos:
- Análisis bioquímico de la actividad del citocromo P450 DAF-9.
- Los ensayos de unión de ligandos y transactivación utilizan DAF-12.
- Experimentos de rescate en el daf-9 mutante C. elegans.
Principales resultados:
- Dos metabolitos de ácido 3-ceto-colestenoico de DAF-9 fueron identificados como ligandos de DAF-12 (ácidos dafacrónicos).
- Los ácidos dafacrónicos se unen al DAF-12 en concentraciones nanomolares y activan su función.
- DAF-9 exhibe una actividad bioquímica análoga a la del CYP27A1 de los mamíferos en el metabolismo de esteroles.
Conclusiones:
- Identificó las primeras hormonas esteroides en los nematodos, los ácidos dafacrónicos, como ligandos para el receptor DAF-12.
- Mecanismos conservados demostrados de regulación esteroidea de la reproducción de los nematodos a los humanos.
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