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La trombina estimula la actividad enzimática de la arginasa endotelial humana a través de la vía RhoA / ROCK:
Xiu-Fen Ming1, Christine Barandier, Hema Viswambharan
1Vascular Biology, Department of Medicine, Division of Physiology, University of Fribourg, Fribourg, Switzerland.
Circulation
|December 1, 2004
Resumen
La trombina aumenta la actividad de la arginasa a través de RhoA/ROCK en las células endoteliales. Esta actividad elevada contribuye a la disfunción endotelial en la aterosclerosis, lo que sugiere la arginasa como un objetivo terapéutico.
Área de la Ciencia:
- Biología Vascular Biología Vascular
- La bioquímica es la bioquímica.
- Investigación Cardiovascular Investigación Cardiovascular Investigación Cardiovascular Investigación Cardiovascular Investigación Cardiovascular
Sus antecedentes:
- La arginasa compite con la sintetasa de óxido nítrico endotelial (eNOS) por la L-arginina, reduciendo la producción de óxido nítrico (NO).
- Comprender la regulación de la arginasa es crucial para abordar la disfunción endotelial y la aterosclerosis.
Objetivo del estudio:
- Investigar los mecanismos reguladores de la actividad de la arginasa en las células endoteliales.
- Determinar el papel de la arginasa en la patogénesis de la aterosclerosis.
Principales métodos:
- Se evaluó la actividad de la arginasa en las células endoteliales de la vena umbilical humana estimuladas por la trombina.
- Utilizó inhibidores y activadores de la vía RhoA/ROCK para estudiar la señalización.
- Se analizaron los niveles de arginasa II y RhoA en aortas apoE-/- de ratones ateroscleróticos.
- Examinó las respuestas vasculares a la inhibición de la L-arginina y la arginasa en modelos de ratón.
Principales resultados:
- La actividad de la arginasa aumentó dependiendo de la dosis de trombina y el tiempo a través de la vía RhoA / ROCK.
- Los mutantes activos de RhoA y ROCK aumentaron significativamente la actividad de la arginasa.
- Se observaron niveles elevados de actividad de arginasa II y de RhoA en aortas de ratón aterosclerótico.
- La inhibición de la arginasa mejoró la vasodilatación en ratones ateroscleróticos.
Conclusiones:
- La trombina estimula la actividad de la arginasa endotelial a través de la vía RhoA/ROCK.
- El aumento de la actividad de la arginasa contribuye a la disfunción endotelial en la aterosclerosis.
- Dirigirse a la arginasa vascular presenta una estrategia terapéutica potencial para la aterosclerosis.
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