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Neurobiological links between Alzheimer's disease and reward system dysfunction

2 weeks ago
Alzheimer's disease (AD) is a highly prevalent progressive neurodegenerative disorder with unclear etiology, complex symptoms, and limited treatment options. Early pathological processes in AD emerge long before the onset of overt cognitive and motor symptoms and involve the accumulation of amyloid-β oligomers and neurofibrillary tangles, accompanied by neuroinflammation and neuronal loss. Importantly, the brain reward system comprises cortical and subcortical structures that share neurochemical...
Hasmik Harutyunyan

Pan-neurodegeneration proteomics reveals disease subtypes and molecular signatures

2 weeks ago
Neurodegenerative diseases (NDs) pose clinical challenges due to their complexity and molecular heterogeneity. Here, we present a pan-neurodegeneration atlas (PanNDA) from multilayer, deep proteomic analysis of 2,279 human brain samples spanning 6 major NDs: Alzheimer's disease (AD), Lewy body dementia (LBD), frontotemporal lobar degeneration with TDP-43 pathology, progressive supranuclear palsy with tau pathology, vascular dementia, and Parkinson's disease. PanNDA integrates data from whole...
Him K Shrestha

Amyloid precursor protein derivatives differentially alter the microRNA cargo of astrocyte-derived extracellular vesicles

2 weeks ago
Alterations to the protein and microRNA cargo of extracellular vesicles (EVs) occur in Alzheimer's disease (AD) and may contribute to disease progression. We previously showed that ingestion of amyloid-beta (Aβ) by both murine and human astrocytes leads to alterations to the protein cargo of EVs that induce significant neuronal impairment and apoptosis. Here, we hypothesised that pathological changes to the microRNA cargo of astrocyte-derived EVs (ADEVs) would also occur following exposure of...
Aimee J Chu

Early-onset axonal pathology and β-amyloidosis in human brains with hematological malignances and cardiovascular diseases

2 weeks ago
β-Amyloid (Aβ) and tau pathologies are hallmark lesions of Alzheimer's disease (AD) and they develop in human brain following differential spatiotemporal trajectories. Accordingly, young/adult-onset tau-independent β-amyloidosis is rare. We encountered four such cases among 397 banked brains, with the donors died of hematological malignances (blood cancers) or cardiovascular diseases. To explore the pathological implication, we examined 17 brains (10-87 year-old, y) from blood cancer patients...
Yan Wang

Searching for shared epigenetic clocks: evaluating ultra-conserved markers in a de novo genome assembly of the albacore tuna

2 weeks ago
Accurate age estimation is key to understanding life history, population ecology, and effective management of valuable commercial and ecologically relevant species. While DNA methylation-based epigenetic clocks are well developed in mammals, their application in fish is limited. In contrast to mammals, fish lack identified universal fish epigenetic markers. Here we explore the potential of ultra-conserved elements (UCEs) as age predictor markers in albacore tuna (Thunnus alalunga), a worldwide...
Thomas Chevrier