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Nat Commun ; 12(1): 3754, 2021 06 18.
Artigo em Inglês | MEDLINE | ID: mdl-34145241

RESUMO

Atherosclerosis is a major underlying cause of cardiovascular disease. Previous studies showed that inhibition of the co-stimulatory CD40 ligand (CD40L)-CD40 signaling axis profoundly attenuates atherosclerosis. As CD40L exerts multiple functions depending on the cell-cell interactions involved, we sought to investigate the function of the most relevant CD40L-expressing cell types in atherosclerosis: T cells and platelets. Atherosclerosis-prone mice with a CD40L-deficiency in CD4+ T cells display impaired Th1 polarization, as reflected by reduced interferon-γ production, and smaller atherosclerotic plaques containing fewer T-cells, smaller necrotic cores, an increased number of smooth muscle cells and thicker fibrous caps. Mice with a corresponding CD40-deficiency in CD11c+ dendritic cells phenocopy these findings, suggesting that the T cell-dendritic cell CD40L-CD40 axis is crucial in atherogenesis. Accordingly, sCD40L/sCD40 and interferon-γ concentrations in carotid plaques and plasma are positively correlated in patients with cerebrovascular disease. Platelet-specific deficiency of CD40L does not affect atherogenesis but ameliorates atherothrombosis. Our results establish divergent and cell-specific roles of CD40L-CD40 in atherosclerosis, which has implications for therapeutic strategies targeting this pathway.


Assuntos
Aterosclerose/patologia , Linfócitos T CD4-Positivos/metabolismo , Antígenos CD40/metabolismo , Ligante de CD40/metabolismo , Interferon gama/metabolismo , Placa Aterosclerótica/patologia , Animais , Plaquetas/metabolismo , Linfócitos T CD4-Positivos/citologia , Doenças Cardiovasculares/patologia , Células Dendríticas/imunologia , Camundongos , Camundongos Knockout , Miócitos de Músculo Liso/citologia , Transdução de Sinais/fisiologia , Trombose/patologia
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