Boala Alzheimer și alte forme de demență.
73 de articoleThis review examines the relationship between loneliness and social isolation as major risk factors for Alzheimer's disease and cognitive decline, with particular attention to sex differences. The authors discuss mechanisms linking isolation to AD pathology and propose approaches for developing prevention and treatment strategies based on understanding these associations.
Alzheimer's disease is characterized by the accumulation of tau, a toxic protein that damages neurons. As tau spreads throughout the brain to new regions, cognitive decline accelerates and the disease progresses in severity.
This systematic review of five studies involving over 1.6 million participants examines how microvascular complications from diabetes—particularly neuropathy and nephropathy—increase dementia risk, with hazard ratios ranging from 1.12-1.26. Poor glycemic control (HbA1c) and its variability independently contribute to cognitive decline, with each 1% increase in HbA1c associated with an 8% increased dementia risk.
Researchers identified 14 blood metabolites associated with cognitive function and 22 linked to brain structure changes in cognitively normal middle-aged adults, with lifestyle and gut microbiota playing significant roles in shaping these metabolite profiles. Ergothioneine emerged as a promising metabolite marker connected to cognition, potentially offering early identification targets for dementia prevention.
Researchers identified a previously unknown type of programmed cell death called karyoptosis, characterized by nuclear disintegration and driven by interaction between p38 MAP kinase and LaminB1 proteins. This mechanism was observed in approximately 35% of neurons in the frontal cortex of Alzheimer's disease patients, potentially offering new insights into neuronal loss in the disease.
Iron accumulation in the brain is being investigated as a contributing factor to neurodegenerative diseases, particularly Alzheimer's and Parkinson's disease. Scientists are studying this mechanism as part of ongoing efforts to understand the complex processes underlying these conditions affecting millions worldwide.
CADASIL is a hereditary condition affecting small blood vessels in the brain, causing recurrent strokes and progressive cognitive decline leading to early-onset dementia. Researchers are using zebrafish as a model organism to better understand the disease mechanisms and develop potential treatments.
A Rice University study investigates how personality traits influence the physical and emotional health outcomes of spouses caring for dementia patients. The research suggests that individual differences in personality may explain why chronic caregiving stress affects different caregivers' health in varying ways.
Research indicates that specific variants of the AQP4 gene interact with poor sleep patterns to accelerate grey matter loss and cognitive decline. This represents a gene-environment interaction where modifiable sleep behavior may influence the expression of genetic risk for Alzheimer's disease.
This preclinical study demonstrates that D-chiro-inositol, a natural compound with insulin-mimetic properties, reduces amyloid-beta production and promotes neuroprotection in cultured neurons and transgenic mouse models of Alzheimer's disease. The compound enhances insulin receptor signaling, modulates tau-related kinase activity, and shifts immune responses in the brain toward less inflammatory states, suggesting potential therapeutic mechanisms worth further investigation.
This systematic review examines whether reduced awareness of cognitive decline in individuals with mild cognitive impairment (MCI) serves as a predictor of conversion to Alzheimer's disease or dementia. The study synthesized evidence from 11 peer-reviewed longitudinal studies across major databases to clarify whether diminished insight into cognitive abilities in early stages could identify at-risk individuals who need timely intervention.
Speech-based digital markers offer a scalable, non-invasive approach to predicting cognitive decline and complementing blood biomarkers in Alzheimer's disease, though large multilingual longitudinal datasets are lacking. The SpeechDx study is a 3-year multinational observational research program (n=2006) designed to develop and validate speech-based tools for early risk assessment and personalized intervention in preclinical populations.
This review examines how tau protein misfolding and accumulation impair blood-brain barrier integrity and vascular function in Alzheimer's disease and other tauopathies, while also exploring how cerebrovascular dysfunction promotes tau pathology. The authors highlight epigenetic and epitranscriptomic mechanisms regulating cerebrovascular integrity and tauopathy progression, with implications for therapeutic intervention.
This study examined how cognitive reserve—the brain's ability to maintain function despite Alzheimer's pathology—differs between typical and limbic-predominant subtypes of Alzheimer's disease using neuroimaging data from over 500 participants. Results showed that higher cognitive reserve predicted slower cognitive decline, with typical Alzheimer's subtype showing faster reserve deterioration than the limbic-predominant form, highlighting the importance of subtype-specific analyses in understanding disease progression.
This review examines hypertension as a modifiable risk factor for dementia, finding that mid-life hypertension (ages 45-64) correlates with increased cognitive decline and dementia risk, while late-life hypertension shows less consistent associations. Evidence on whether antihypertensive treatment effectively prevents dementia remains conflicting across studies, likely due to methodological differences between observational and randomized controlled trials.
Recent observational studies suggest the Mediterranean diet may be associated with reduced cognitive decline and lower Alzheimer's disease risk, possibly through vascular, metabolic, and anti-inflammatory mechanisms. However, causality has not been established, and large-scale randomized controlled trials are needed to confirm whether the diet can serve as a preventive strategy for dementia.
This review examines how hypertension contributes to major neurocognitive disorders including Alzheimer's disease, vascular dementia, and Lewy body dementia through vascular damage, inflammation, and blood-brain barrier disruption. While antihypertensive medications show promise in some studies, evidence remains inconsistent, highlighting the need for long-term prospective research to clarify treatment effectiveness and the bidirectional relationship between hypertension and cognitive decline.
This review examines cognitive reserve (CR), the brain's ability to compensate for pathology through adaptive mechanisms, as a crucial factor in reducing Alzheimer's disease risk and slowing cognitive decline. The authors evaluate measurement methods, interventions, and practical applications, noting that lifestyle choices and occupational complexity may be more informative than education alone in capturing CR complexity.
