The foam cell-derived exosomes exacerbate ischemic white matter injury via transmitting metabolic defects to microglia

Abstract

Atherosclerosis (AS) has been shown to be an independent risk factor for vascular cognitive impairment (VCI), but the mechanisms remain unclear. Here, we found that AS circulating exosomes exacerbated ischemic white matter injury and VCI. Exosomes originating from macrophage-derived foam cells targeted microglia. Mechanistically, foam cell-derived exosomes transmitted redox imbalance, mitochondrial dysfunction, and metabolic defects to microglia via the miR-101-3p-Nrf2-Slc2a1 axis. Anti-miR-101-3p or activation of Nrf2, both genetically and pharmacologically, could antagonize AS exosomes and ameliorate VCI. In conclusion, our findings reveal a distant connection between peripheral macrophages and brain microglia, which provides new insights and potential targets of AS-induced VCI.

Keywords: Nrf2; atherosclerosis; exosomes; foam cells; glucose metabolism; ischemic white matter injury; miR-101-3p; microglia; mitochondria.