Annexin V binding to platelets is agonist, time and temperature dependent.
Platelets
; 21(4): 289-96, 2010.
Article
em En
| MEDLINE
| ID: mdl-20230207
ABSTRACT
Platelets bind annexin V when stimulated with combinations of platelet agonists such as collagen and thrombin. Previous studies have demonstrated significant heterogeneity of platelets binding annexin V. The relative role of the thrombin protease-activated receptors (PARs), PAR1 and PAR4, together with different methods of platelet preparation on annexin V binding to platelets is unclear. We therefore investigated the role of PAR1- and PAR4-activating peptides in combination with collagen-related peptide on annexin V binding. In diluted whole blood, PAR1- and PAR4-activating peptides were as effective as thrombin in inducing annexin V binding. However, in washed platelets, PAR-activating peptides were less potent than thrombin at inducing annexin V binding. This difference was more pronounced when experiments were performed at 37 degrees C compared to room temperature. In studies of diluted whole blood, platelet rich plasma and washed platelets, platelets incubated at room temperature bound more annexin V than platelets incubated at 37 degrees C. We also saw a significant effect of time on annexin V binding, in that more annexin V bound to platelets with longer incubation times. In conclusion, PAR1 and PAR4-activating peptides were as effective as thrombin in inducing annexin V binding in combination with collagen-related peptide in diluted whole blood and platelet rich plasma, but not in washed platelets. In addition, incubation temperature and time has a strong influence on annexin V binding to platelets. Thus variations in these conditions may explain the differences observed between previous studies.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plaquetas
/
Anexina A5
/
Receptores de Trombina
/
Receptor PAR-1
Limite:
Adult
/
Animals
/
Humans
Idioma:
En
Revista:
Platelets
Assunto da revista:
HEMATOLOGIA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Irlanda