Dietary salt promotes cognitive impairment through tau phosphorylation
Dietary salt promotes cognitive impairment through tau phosphorylation
Dietary habits and vascular risk factors promote both Alzheimer’s disease and cognitive impairment caused by vascular factors1-3. Furthermore, accumulation of hyperphosphorylated tau, a microtubule associated protein and a hallmark of Alzheimer’s pathology, is also linked to vascular cognitive impairment4-7. In mice, a salt-rich diet leads to cognitive dysfunction associated with a nitric oxide deficit in cerebral endothelial cells and cerebral hypoperfusion8. Here we report that dietary salt induces tau hyperphosphorylation followed by cognitive dysfunction, effects prevented by restoring endothelial nitric oxide production. The nitric oxide deficiency reduces neuronal calpain nitrosylation resulting in enzyme activation, which, in turn, leads to tau phosphorylation by activating cyclin dependent kinase-5. Salt-induced cognitive impairment is not observed in tau-null mice or in mice treated with anti-tau antibodies, despite persistent cerebral hypoperfusion and neurovascular dysfunction. These findings unveil a causal link between dietary salt, endothelial dysfunction and tau pathology, independent of hemodynamic insufficiency. Avoiding excessive salt intake and maintaining vascular health may help stave off vascular and neurodegenerative pathologies underlying late-life dementia.
Hochrainer Karin、Segarra Steven G.、Schaeffer Samantha、Santisteban Monica M.、Iadecola Costantino、Menon Ajay、Holtzman David M.、Anrather Josef、Jiang Hong、Faraco Giuseppe
Feil Family Brain and Mind Research Institute, Weill Cornell MedicineFeil Family Brain and Mind Research Institute, Weill Cornell MedicineFeil Family Brain and Mind Research Institute, Weill Cornell MedicineFeil Family Brain and Mind Research Institute, Weill Cornell MedicineFeil Family Brain and Mind Research Institute, Weill Cornell MedicineFeil Family Brain and Mind Research Institute, Weill Cornell MedicineDepartment of Neurology, Hope Center for Neurological Disorders, Knight Alzheimer?ˉs Disease Research Center, Washington UniversityFeil Family Brain and Mind Research Institute, Weill Cornell MedicineDepartment of Neurology, Hope Center for Neurological Disorders, Knight Alzheimer?ˉs Disease Research Center, Washington UniversityFeil Family Brain and Mind Research Institute, Weill Cornell Medicine
神经病学、精神病学基础医学生理学
Hochrainer Karin,Segarra Steven G.,Schaeffer Samantha,Santisteban Monica M.,Iadecola Costantino,Menon Ajay,Holtzman David M.,Anrather Josef,Jiang Hong,Faraco Giuseppe.Dietary salt promotes cognitive impairment through tau phosphorylation[EB/OL].(2025-03-28)[2025-05-09].https://www.biorxiv.org/content/10.1101/470666.点此复制
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