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Efecto de la hipercolesterolemia en la expresión y función de la guanylil ciclasa vascularmente soluble
Ute Laber1, Thorsten Kober, Verena Schmitz
1Institut für Pharmakologie und Klinische Pharmakologie, Heinrich-Heine-Universität, Düsseldorf, Germany.
Circulation
|February 21, 2002
Resumen
La hipercolesterolemia causa sobreexpresión de disfuncional disoluble guanylil ciclasa (sGC) en los vasos sanguíneos. Esta condición es reversible y puede contribuir al desarrollo de la aterosclerosis.
Área de la Ciencia:
- Biología Cardiovascular Biología Cardiovascular
- La medicina molecular es una medicina molecular.
- Investigación de la aterosclerosis Investigación de la aterosclerosis.
Sus antecedentes:
- La vasodilatación mediada por el óxido nítrico endotelial (NO) se basa en la activación de la guanylil ciclasa soluble (sGC).
- Se sabe que la hipercolesterolemia perjudica la vasodilatación mediada por NO tanto en modelos animales como en humanos.
Objetivo del estudio:
- Investigar el impacto de la hipercolesterolemia en la expresión y función de la guanylil ciclasa soluble (sGC).
Principales métodos:
- Los conejos fueron alimentados con dietas estándar o ricas en colesterol durante diferentes períodos de tiempo.
- La expresión aórtica de las subunidades sGC (alfa1 y beta1) se cuantificó utilizando Western blot.
- Se midió la relajación vascular a SNAP y la actividad de sGC en los citosolos aórticos.
Principales resultados:
- La hipercolesterolemia condujo a una regulación significativa de las subunidades sGC-alfa1 y sGC-beta1 en las aortas de conejo.
- A pesar del aumento de la expresión, la actividad basal y NO-estimulada sGC sólo se mejoró marginalmente, y la potencia vasodilatadora se redujo.
- El sGC sobreexpresado se localizó en lesiones íntimas, y los cambios fueron reversibles tras la normalización de la dieta.
Conclusiones:
- La hipercolesterolemia induce una sobreexpresión reversible de un sGC vascular disfuncional.
- Este sGC disfuncional puede desempeñar un papel en la patogénesis de la aterosclerosis.
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