New Data Questions Herpes-Alzheimer’s Connection
A large multinational epidemiology study finds only small and inconsistent associations.
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A large multinational epidemiology study finds only small and inconsistent associations.
Overexpressing the endosomal activator in neurons not only caused those organelles to swell, but also bungled synaptic transmission, goaded hyperphosphorylation of tau, and destroyed cholinergic neurons.
In a mouse model of cortical multiple sclerosis, microglia and monocytes swooped in to gobble up synapses when dendritic calcium rose. Spines grew back once inflammation subsided.
The brain shrinkage due to verubecestat emerged quickly but did not worsen or cause neurodegeneration. Curiously, both verubecestat and lanabecestat dulled episodic memory and boosted verbal fluency.
Researchers identified genetic variants that may explain why some ApoE4 carriers remain free of Alzheimer’s, while some ApoE2 carriers do not.
The first ultrasensitive plasma test for this old marker differentiates Alzheimer’s from healthy controls and non-AD dementias. It segregates people stepwise at phases of pathogenesis down to Braak stages 1 and 2 and below amyloid PET positivity.
People who carry the ApoE4 variant are more likely to succumb to the virus. In vitro, SARS-CoV-2 infects more ApoE4 than ApoE3 brain cells. Astrocytes were activated, neurons degenerated.
Researchers unearthed 75 risk loci, 42 of them new, and nominated candidate genes for each. A polygenic risk score based on all variants predicted AD risk with high accuracy.
Quantifying 95 post-translational modifications of tau extracted from AD and control brains, a proteomics study proposes a “processive” model of phosphorylation, ubiquitination, acetylation that drive aggregation and map to distinct stages of disease.
Single-cell RNA sequencing of 16,000 live microglia freshly isolated from human brain reveals nine distinct subtypes. One fades in Alzheimer’s. Why?
Among people with early AD, the monoclonal antibody wiped out Aβ plaques and slowed cognitive and functional decline by a third, relative to placebo.
The enzyme degrades anti-inflammatory fatty acids in the brain. Blocking it with a brain-penetrant small molecule calmed A1 astrocytes, synapse-eating microglia, and improved amyloidosis and cognition in a mouse model.
Plaque-ridden 5xFAD mice were no better at fending off an intracerebral herpes virus infection than their wild-type counterparts. The virus was not to be found within Aβ plaques and did not spur plaques to form.
By comparing protein changes with GWAS data, scientists identified new links to AD. This method can unearth genes that otherwise fall short of genome-wide significance.
In mouse models of Aβ toxicity and amyloidosis, inhibiting the integrated stress response restored protein production, spared synapses, and brought back memory.