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[Cognitive impairment and the blood-brain barrier in chronic kidney disease: role of the uremic toxins].
Néphrologie & Thérapeutique 2023 December 8
Patients with chronic kidney disease (CKD) have an increased risk of cognitive disorders, presenting as vascular dementia, compared with the general population. These cognitive disorders occur early during the course of the kidney disease and evolve in parallel with the decline in glomerular filtration rate. They affect 30 to 80 % of patients with stage 5 CKD. Kidney transplantation only partially improves cognitive impairment. In this narrative review, we summarize the epidemiology and recent clinical and experimental data on cognitive impairment in CKD and discuss the potential specific mechanisms. Among the factors associated with cognitive impairment, the accumulation of uremic toxins such as indoxyl sulfate appears to be a specific risk factor for cognitive decline. These toxins have an endothelial toxicity that can disrupt the cerebral endothelium. The rupture of the blood-brain barrier (BBB) is a mechanism implicated in several neurodegenerative pathologies and systemic diseases with cerebral tropism. Recent experimental findings in CKD indicate that disruption of the BBB appears to be an important mechanism behind cognitive impairment in CKD. In murine models of CKD, increased BBB permeability is linked to memory impairment and aryl hydrocarbon receptor activation following accumulation of circulating indoxyl sulfate. This disruption of the BBB could also have harmful consequences for stroke susceptibility and drug neurotoxicity in CKD patients.
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