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Nat Aging ; 3(7): 796-812, 2023 07.
Artigo em Inglês | MEDLINE | ID: mdl-37277641

RESUMO

Mitochondrial dysfunction is linked to age-associated inflammation or inflammaging, but underlying mechanisms are not understood. Analyses of 700 human blood transcriptomes revealed clear signs of age-associated low-grade inflammation. Among changes in mitochondrial components, we found that the expression of mitochondrial calcium uniporter (MCU) and its regulatory subunit MICU1, genes central to mitochondrial Ca2+ (mCa2+) signaling, correlated inversely with age. Indeed, mCa2+ uptake capacity of mouse macrophages decreased significantly with age. We show that in both human and mouse macrophages, reduced mCa2+ uptake amplifies cytosolic Ca2+ oscillations and potentiates downstream nuclear factor kappa B activation, which is central to inflammation. Our findings pinpoint the mitochondrial calcium uniporter complex as a keystone molecular apparatus that links age-related changes in mitochondrial physiology to systemic macrophage-mediated age-associated inflammation. The findings raise the exciting possibility that restoring mCa2+ uptake capacity in tissue-resident macrophages may decrease inflammaging of specific organs and alleviate age-associated conditions such as neurodegenerative and cardiometabolic diseases.


Assuntos
Cálcio , Proteínas de Transporte da Membrana Mitocondrial , Camundongos , Animais , Humanos , Proteínas de Transporte da Membrana Mitocondrial/genética , Cálcio/metabolismo , Mitocôndrias/metabolismo , Inflamação/metabolismo , Macrófagos/metabolismo , Proteínas de Ligação ao Cálcio/genética
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