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El inhibidor-1 del activador del plasminógeno promueve la formación de micropartículas endoteliales con potencial
Sergey V Brodsky1, Kazimierz Malinowski, Marc Golightly
1Department of Medicine, New York Medical College, Valhalla, NY 11595, USA.
Circulation
|October 31, 2002
Resumen
El inhibidor del activador del plasminógeno-1 (PAI-1) promueve la formación de micropartículas endoteliales, lo que podría vincular los altos niveles de PAI-1 con la trombosis en enfermedades cardiovasculares.
Área de la Ciencia:
- Biología Cardiovascular Biología Cardiovascular
- Biología celular endotelial Biología celular endotelial
- La hemostasis y la trombosis
Sus antecedentes:
- La disfunción endotelial es un factor clave en las enfermedades cardiovasculares.
- El aumento del inhibidor del activador del plasminógeno-1 (IAP-1) y la actividad procoagulante son características de la disfunción endotelial.
- Los mecanismos celulares que vinculan el PAI-1 a un estado procoagulante requieren más investigación.
Objetivo del estudio:
- Para investigar las acciones celulares de PAI-1.
- Explorar el vínculo potencial entre el PAI-1 y el estado procoagulante.
- Para aclarar el papel de PAI-1 en la formación de micropartículas endoteliales.
Principales métodos:
- Las células endotelial de la vena umbilical humana fueron tratadas con PAI-1.
- Las técnicas incluyeron microscopía con fluorescencia confocal láser, inmunoprecipitación, Western blotting y análisis FACS.
- Se aislaron e identificaron micropartículas endoteliales; también se estudiaron ratones con knockout PAI-1.
Principales resultados:
- El tratamiento con PAI-1 redujo la expresión de uPAR y aumentó las micropartículas endoteliales que expresan uPAR y la integrina alfa (V) beta3.
- PAI-1 aumentó dependiendo de la dosis las micropartículas positivas de Annexin V, lo que indica exposición a fosfolípidos aniónicos.
- La generación de trombina se aceleró, y los ratones knockout PAI-1 mostraron menos micropartículas circulantes.
Conclusiones:
- La PAI-1 promueve dependiendo de la dosis la formación de micropartículas endoteliales con una asimetría fosfolípida alterada.
- Este proceso puede explicar el aumento de la generación de trombina in vitro observada.
- Los hallazgos vinculan los niveles elevados de PAI-1 con una mayor propensión a la trombosis en la disfunción endotelial.
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