alcoholism is a risk factor for the development of cognitive decline and dementia. Here we demonstrated that the paravascular function in the brain was impaired by ethanol in a dose-dependent manner. Acute moderate an...
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alcoholism is a risk factor for the development of cognitive decline and dementia. Here we demonstrated that the paravascular function in the brain was impaired by ethanol in a dose-dependent manner. Acute moderate and heavy ethanol administration substantially retarded and reduced the entry of subarachnoid cerebrospinal fluid(CSF) via the paravascular space into the cerebral parenchyma, thus impaired CSFinterstitial fluid(ISF) exchange and parenchymal amyloid β(Aβ) peptide clearance. The elevated release of β-endorphin and reduced cerebrovascular pulsatility after acute ethanol administration could account for the impairment of the paravascular function. Chronic ethanol consumption led to a global activation of astrocytes and a widespread loss of perivascular AQP4 polarization in the brain, which results in an irreversible impairment of the paravascular function and parenchymal Aβ clearance. Therefore, we propose that impaired paravascular functions and reduced parenchymal Aβ clearance found in both acute and chronic ethanol-treated animals may contribute to the development of cognitive decline and dementia in alcoholism.
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