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La calcineurina en la hipertrofia del corazón humano
Oliver Ritter1, Susanne Hack, Kai Schuh
1Department of Medicine, University of Wuerzburg, Germany.
Circulation
|May 16, 2002
Resumen
La activación de la vía de la calcineurina se incrementa en la cardiomiopatía obstructiva hipertrófica y la estenosis aórtica sin insuficiencia cardíaca. Esto sugiere calcineurin calcineurin.
Área de la Ciencia:
- Biología Cardiovascular Biología Cardiovascular
- Cardiología Molecular Cardiología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- La señalización de la vía de la calcineurina es suficiente para la hipertrofia cardíaca en modelos animales.
- Se observa una actividad elevada de la calcineurina en la insuficiencia cardíaca humana.
- Existen datos limitados sobre la actividad de la calcineurina en los corazones hipertróficos no fallidos.
Objetivo del estudio:
- Para investigar la actividad de la calcineurina y la expresión de proteínas en la cardiomiopatía obstructiva hipertrófica (HOCM) y la estenosis aórtica (AS).
- Para determinar el papel de la calcineurina en la hipertrofia cardíaca humana sin fallo.
Principales métodos:
- Se evaluó la actividad de la calcineurina y la expresión de proteínas en el tejido miocárdico de pacientes con HOCM y AS.
- Utilizó la reacción en cadena de la polimerasa de transcripción inversa para detectar variantes de empalme.
- Factor nuclear analizado de la migración de las células T activadas 2 (NF-AT2) a través de SDS-PAGE.
Principales resultados:
- Se observó una abundancia reducida de la calcineurina A C-terminal, lo que sugiere la proteólisis.
- Actividad enzimática de la calcineurina significativamente elevada en HOCM y AS en comparación con los corazones normales.
- El aumento de la actividad de la calcineurina fosfatasa condujo a una mayor desfosforilación de NF-AT2.
Conclusiones:
- La hipertrofia cardíaca en HOCM y AS sin insuficiencia cardíaca muestra un aumento de la actividad de la calcineurina.
- La proteólisis parcial del extremo C de la calcineurina puede contribuir al aumento de la actividad.
- La activación de la calcineurina está implicada en la patogénesis de la hipertrofia cardíaca humana, independientemente del desencadenante inicial.
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