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Inicio Angiología Ateromatosis y aterotrombosis carotídea. Implicación del factor tisular
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Vol. 55. Núm. 1.
Páginas 64-76 (enero 2003)
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Vol. 55. Núm. 1.
Páginas 64-76 (enero 2003)
Acceso a texto completo
Ateromatosis y aterotrombosis carotídea. Implicación del factor tisular
Carotid atheromatosis and a therothrombosis. the involvement of the tissue factor
Ateromatose eaterotrombose carotídea. envolvimento do factor tecidual
Visitas
5116
E. Catenaa,c, J. Krupinskia,c, R. Vilab, M.A. Cairols
,b
, F. Rubio-Borregoa, L. Badimónc
a Servicio de Neurología. Hospital Universitario de Bellvitge. L'Hospitalet de Llobregat, Barcelona.
b Servicio de Angiología y Cirugía Vascular. Hospital Universitario de Bellvitge. L'Hospitalet de Llobregat, Barcelona.
c Centro de Investigación Cardiovascular. CSIC/ICCC. Barcelona España.
Este artículo ha recibido
Información del artículo
Resumen
Introducción

Los procesos implicados en lagénesisy progresión de la enfermedad aterosclerótica todavía no se conocen bien; es posible que, a lo largo de los años, el crecimiento de las placas ateroscleróticas sea discontinuo en lugar de lineal, conperíodos de inactividadrelativa interrumpidos por otros de rápida evolución.

Desarrollo

Se comentan los estadios diferenciados en lapatogénesis de la aterosclerosis, así como elpapel que desempeña el factor tisular (FT) en la aterotrombosis. Investigaciones recientes destacan la importancia de la vía del FT, anteriormente denominada vía extrínseca delsistema de la coagulación, que es elprincipalsistemade coagulación in vivo, y lo consideran elprincipalregulador de la coagulación, de la hemostasia y de la trombosis. El proceso procoagulante se inicia cuando, tras romperse la placa aterosclerótica, se expone a la circulación sanguínea el núcleo grasoy su contenido en FT se hace accesible a las pequeñas cantidades de factor VIIa que circulan por la sangre, iniciándose así la deposiciónplaquetariay la cascada de la coagulación.

Conclusión

En la actualidadse están realizando ensayos clínicos sobre las lesiones ateroscleróticas carotídeas confármacos anticoagulantes cuyo principal mecanismo de acción se centra en la inhibición de la vía del FT.

Palabras clave:
Ateromatosis carotídea
Aterosclerosis
Aterotrombosis carotídea
Factor tisular
Lipoproteínas
Placafibrosa
Sistema de coagulación
Summery
Introduction

We still do not have a very clear understanding ofthe processes involved in the genesis andprogression ofatherosclerotic disease. With thepassing oftheyears, the growth of atherosclerotic plaques may become discontinuous insteadoflinear, withperiods of relative inactivity that are interrupted by others in whichprogress is fast.

Development

We discuss the differentstages in the pathogenesis of atherosclerosis, and also the role playedby the tissuefactor (TF) in atherothrombosis. Recent research has underlinedthe importance ofthe TF pathway (previously known as the extrinsic pathway ofthe coagulation system), which is the main coagulation system in vivo, andit is seen as beingthe chiefregulatorofcoagulation, haemostasis andthrombosis. The procoagulation process begins when, after rupture ofthe atherosclerotic plaque, the lipid nucleus is exposedto the bloodstream andits TF content becomes accessible to the small amounts of factor VIIa circulating in the blood, thus triggering plaque deposition and the coagulation cascade.

Conclusion

Clinical trials are currently being conductedon carotidatherosclerotic lesions with anticoagulant drugs that act mainly through a mechanism which centres on inhibiting the TF pathway.

Key words:
Atherosclerosis
Carotid atheromatosis
Carotid atherothrombosis
Coagulation system
Fibrous plaque
Lipoproteins
Tissuefactor
Resumo
Introdução

Osprocessos envolvidos na génese e progressão da doença aterosclerótica não são bem conhecidas; é possível que, ao longo dos anos, o crescimento dasplacas ateroscleróticas seja descontínuo em vez de linear, comperíodos de inactivida-de relativa interrompidos por outros de rápida evolucao.

Desenvolvimento

Comentam-se os estados diferenciados napatogénese da aterosclerose, assim como o papel que des-empenha o factor tecidual (FT) na aterotrombose. Investigações recentes destacam a importancia da via do FT, anteriormente denominada via extrínseca do sistema de coagulacao, que é o principal sistema de coagulação in vivo, e consideram-no o principal regulador da coagulação, da hemostase e da trombose. Oprocessopró-coagulante tem início quando, após ruptura da placa ateros-clerótica, expõe-se a circulação sanguínea o nucelo gordo e o seu conteúdo de FT tornase acessível as pequenas quantidades de factor VIIa que circulam no sangue, dando início a deposição plaquetária e a cascata da coagulacao.

Conclusão

Actualmente estão a realizar-se ensaios clínicos sobre as lesões ateroscleróticas carotídeas comfármacos anticoagulantes cujo principal mecanismo de acção centra-se na inibição da via do FT.

Palavras chave:
Ateromatose carotídea
Aterosclerose
Aterotrombose carotídea
Factor tecidual
Lipoproteínas
Placafibrosa
Sistema de coagulacao
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