Antithrombotic and fibrinolytic system of human endothelial cells seeded on PTFE: the effects of surface modification of PTFE by ammonia plasma treatment and ECM protein coatings.
Biomaterials
; 22(11): 1439-46, 2001 Jun.
Article
en En
| MEDLINE
| ID: mdl-11336319
ABSTRACT
The aim of this study was to determine the effects of ECM protein coatings and surface modification of PTFE on the ability of seeded human endothelial cells (EC) to secrete prostacyclin (PGI2), plasminogen inhibitor-1 (PAI-1) and tissue plasminogen activator (t-PA). PTFE surfaces were modified by a novel surface modification technique based on ammonia plasma. Fibronectin, collagen type-1 and gelatin-coated ammonia plasma modified PTFE and unmodified PTFE surfaces were employed and compared in this study. All ammonia plasma modified surfaces showed similar secretions of PGI2 compared to non-modified PTFE surfaces. With the exception of gelatin-coated modified PTFE, seeded EC seeded on all modified PTFE showed lower levels of PAI-1 secretion compared to those seeded on unmodified PTFE. The specific activity of t-PA secreted by EC seeded on ammonia plasma modified and fibronectin coated modified PTFE showed increases of 100 and 30%, respectively, when compared to their unmodified counterparts. Our studies show that EC seeded on modified PTFE have ability to secrete PGI2 that modulates the early phase of thrombus formation. Furthermore, superior t-PA profile, along with lower levels of PAl-1 suggest that ammonia plasma modification and use of appropriate ECM proteins can modulate antithrombotic and fibrinolytic properties of in vitro endothelialized vascular prostheses. Accordingly, these surfaces may be suitable to further develop protocols and other strategies for arterial and venous reconstruction.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Endotelio Vascular
/
Antitrombinas
/
Proteínas de la Matriz Extracelular
/
Fibrinólisis
/
Amoníaco
Límite:
Humans
Idioma:
En
Revista:
Biomaterials
Año:
2001
Tipo del documento:
Article
País de afiliación:
Canadá