High-mobility group box protein 1 neutralization reduces development of diet-induced atherosclerosis in apolipoprotein e-deficient mice.
Arterioscler Thromb Vasc Biol
; 31(2): 313-9, 2011 Feb.
Article
em En
| MEDLINE
| ID: mdl-21088249
ABSTRACT
OBJECTIVE:
High-mobility group box protein 1 (HMGB1) is a DNA-binding protein and cytokine highly expressed in atherosclerotic lesions, but its pathophysiological role in atherosclerosis is unknown. We investigated its role in the development of atherosclerosis in ApoE-/- mice. METHODS ANDRESULTS:
Apolipoprotein E-deficient (ApoE-/-) mice fed a high-fat diet were administered a monoclonal anti-HMGB1 neutralizing antibody, and the effects on lesion size, immune cell accumulation, and proinflammatory mediators were assessed using Oil Red O, immunohistochemistry, and real-time polymerase chain reaction. As with human atherosclerotic lesions, lesions in ApoE-/- mice expressed HMGB1. Treatment with the neutralizing antibody attenuated atherosclerosis by 55%. Macrophage accumulation was reduced by 43%, and vascular cell adhesion molecule-1 and monocyte chemoattractant protein-1 expression was attenuated by 48% and 72%, respectively. CD11c+ dendritic cells were reduced by 65%, and the mature (CD83+) population was reduced by 60%. Treatment also reduced CD4+ cells by nearly 50%. mRNAs in lesions encoding tumor necrosis factor-α and interleukin-1ß tended to be reduced. Mechanistically, HMGB1 stimulated macrophage migration in vitro and in vivo; in vivo, it markedly augmented the accumulation of F4/80+Gr-1(Ly-6C)+ macrophages and also increased F4/80+CD11b+ macrophage numbers.CONCLUSIONS:
HMGB1 exerts proatherogenic effects augmenting lesion development by stimulating macrophage migration, modulating proinflammatory mediators, and encouraging the accumulation of immune and smooth muscle cells.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Apolipoproteínas E
/
Gorduras na Dieta
/
Proteína HMGB1
/
Aterosclerose
/
Anticorpos Neutralizantes
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Austrália