Stimulation of cell surface F1-ATPase activity by apolipoprotein A-I inhibits endothelial cell apoptosis and promotes proliferation.
Arterioscler Thromb Vasc Biol
; 29(7): 1125-30, 2009 Jul.
Article
en En
| MEDLINE
| ID: mdl-19372457
ABSTRACT
OBJECTIVE:
Several findings argue for a protective effect of high-density lipoproteins (HDLs) against endothelial dysfunction. The molecular mechanisms underlying this protective effect are not fully understood, although recent works suggest that the actions of HDL on the endothelium are initiated by multiple interactions between HDLs (lipid or protein moiety) and cell surface receptors. We previously showed that the mitochondrial related F(1)-ATPase is a cell surface receptor for HDLs and their main atheroprotective apolipoprotein (apoA-I). Herein we test the hypothesis that the cell surface F(1)-ATPase may contribute to the ability of apoA-I and HDLs to maintain endothelial cell survival. METHODS ANDRESULTS:
Cell imaging and binding assays confirmed the presence of the F(1)-ATPase at the surface of human umbilical vein endothelial cells (HUVECs) and its ability to bind apoA-I. Cell surface F(1)-ATPase activity (ATP hydrolysis into ADP) was stimulated by apoA-I and was inhibited by its specific inhibitor IF(1)-H49K. Furthermore the antiapoptotic and proliferative effects of apoA-I on HUVECs were totally blocked by the F(1)-ATPase ligands IF(1)-H49K, angiostatin and anti-betaF(1)-ATPase antibody, independently of the scavenger receptor SR-BI and ABCA1.CONCLUSIONS:
This study suggests an important contribution of cell surface F(1)-ATPase to apoA-I-mediated endothelial cell survival, which may contribute to the atheroprotective functions of apoA-I.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Apolipoproteína A-I
/
Apoptosis
/
ATPasas de Translocación de Protón
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Células Endoteliales
/
Proliferación Celular
Límite:
Humans
Idioma:
En
Revista:
Arterioscler Thromb Vasc Biol
Asunto de la revista:
ANGIOLOGIA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Francia