RESUMEN

Ischemic preconditioning (IP) is a well-known strategy to protect organs against cell death following ischemia. The previous work has shown that vasodilator-stimulated phosphoprotein (VASP) is involved in cytoskeletal reorganization and that it holds significant importance for the extent of myocardial ischemia reperfusion injury. Yet, the role of VASP during myocardial IP is, to date, not known. We report here that VASP phosphorylation at serine157 and serine239 is induced during hypoxia in vitro and during IP in vivo. The preconditioning-induced VASP phosphorylation inactivates the GP IIb/IIIa integrin receptor on platelets, which results in the reduced formation of organ compromising platelet neutrophil complexes. Experiments in chimeric mice confirmed the importance of VASP phosphorylation during myocardial IP. When studying this in VASP-/- animals and in an isolated heart model, we were able to confirm the important role of VASP on myocardial IP. In conclusion, we were able to show that IP-induced VASP phosphorylation in platelets is a protective mechanism against the deleterious effects of ischemia.

Asunto(s)

Plaquetas/metabolismo , Moléculas de Adhesión Celular/sangre , Precondicionamiento Isquémico Miocárdico/métodos , Proteínas de Microfilamentos/sangre , Infarto del Miocardio/prevención & control , Miocardio/metabolismo , Neutrófilos/metabolismo , Fosfoproteínas/sangre , Adhesividad Plaquetaria , Animales , Moléculas de Adhesión Celular/deficiencia , Moléculas de Adhesión Celular/genética , Hipoxia de la Célula , Modelos Animales de Enfermedad , Preparación de Corazón Aislado , Ratones Endogámicos C57BL , Ratones Noqueados , Proteínas de Microfilamentos/deficiencia , Proteínas de Microfilamentos/genética , Infarto del Miocardio/sangre , Infarto del Miocardio/genética , Infarto del Miocardio/patología , Miocardio/patología , Fosfoproteínas/deficiencia , Fosfoproteínas/genética , Fosforilación , Complejo GPIIb-IIIa de Glicoproteína Plaquetaria/metabolismo , Transducción de Señal