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    Animal models to study cognitive impairment of chronic kidney disease
    (2024) Silva, Pedro H. Imenez; Pepin, Marion; Figurek, Andreja; Gutierrez-Jimenez, Eugenio; Bobot, Mickael; Iervolino, Anna; Mattace-Rosso, Francesco; Hoorn, Ewout J.; Bailey, Matthew A.; Henaut, Lucie; Nielsen, Rikke; Frische, Sebastian; Trepiccione, Francesco; Hafez, Gaye; Altunkaynak, Hande O.; Endlich, Nicole; Unwin, Robert; Capasso, Giovambattista; Pesic, Vesna; Massy, Ziad; Wagner, Carsten A.; Consortium, Connect
    Mild cognitive impairment (MCI) is common in people with chronic kidney disease (CKD) and its prevalence increases with progressive loss of kidney function. MCI is characterized by a decline in cognitive performance greater than expected for an individual age and education level but with minimal impairment of instrumental activities of daily living. Deterioration can affect one or several cognitive domains (attention, memory, executive functions, language, and perceptual motor or social cognition). Given the increasing prevalence of kidney disease, more and more people with CKD will also develop MCI causing an enormous disease burden for these individuals, their relatives and society. However, the underlying pathomechanisms are poorly understood and current therapies mostly aim at supporting patients in their daily life. This illustrates the urgent need to elucidate the pathogenesis, and potential therapeutic targets and test novel therapies in appropriate preclinical models. Here, we will outline the necessary criteria for experimental modelling of cognitive disorders in CKD. We discuss the use of mice, rats and zebrafish as model systems and present valuable techniques through which kidney function and cognitive impairment can be assessed in this setting. Our objective is to enable researchers to overcome hurdles and accelerate preclinical research aimed at improving therapy of people with CKD and MCI.
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    Genetic and circulating biomarkers of cognitive dysfunction and dementia in CKD
    (2025) Zoccali, Carmine; Mallamaci, Francesca; Wagner, Carsten A.; Unwin, Robert; Nedergaard, Maiken; Hafez, Gaye; Malyszko, Jolanta; Pepin, Marion; Massy, Ziad; Paolisso, Giuseppe; Remuzzi, Giuseppe; Capasso, Giovambattista B.; CONNECT Action (Cognitive Decline in Nephro-Neurology European Cooperative Target) collaborators
    Chronic kidney disease (CKD) is commonly accompanied by cognitive dysfunction and dementia, which, in turn, increase the risk of hospitalization, cardiovascular events and death. Over the last 30 years, only four studies focused on genetic markers of cognitive impairment in CKD and kidney failure (KF), indicating a significant gap in research. These studies suggest potential genetic predispositions to cognitive decline in CKD patients but also underscore the necessity for more comprehensive studies. Seventeen reports have established connections between cognitive function and kidney disease markers such as estimated glomerular filtration rate (eGFR), Cystatin C and albuminuria. A rapid eGFR decline has been associated with cognitive deterioration and vascular dementia, and mild to moderate eGFR reductions with diminished executive function in elderly men. Various biomarkers have been associated to Alzheimer’s disease or dementia in CKD and KF. These include amyloid beta and phosphorylated tau proteins, uremic toxins, gut microbiota, metabolic indicators, hypertension, endothelial dysfunction, vitamins and inflammation. However, the causal relevance of these associations remains unclear. Overall, the available evidence points to a complex interplay between the different biomarkers and cognitive health in CKD patients, underscoring the need for more research to elucidate these relationships.