Tag

Amyloid Beta

All articles tagged with #amyloid beta

science1 day ago•5 min saved

Could Alzheimer’s Pathology Be Transmitted Through Blood Transfusions?

A Lancet review explores whether amyloid-beta pathology linked to Alzheimer’s could spread via blood transfusions. While not proven, prior work hints at transferable amyloid via medical procedures, and a 2023 Danish-Swedish study found recipients of transfusions from donors who later developed brain bleeds had higher recurrence risk, a clue connected to cerebral amyloid angiopathy. Experts urge caution, noting insufficient data to quantify risk, but advocate large-scale epidemiological studies and potential safeguards (donor biomarker screening, enhanced monitoring for high-risk patients). The UK infected blood inquiry is cited as a cautionary example of delaying safety measures, underscoring the need for transparency and preparedness.

via ScienceAlert|

#alzheimers #amyloid-beta #blood-transfusion

science9 days ago•7 min saved

Gut Metabolite From Microbes Tied to Alzheimer’s Pathology

A new study identifies imidazole propionate (ImP), a metabolite produced by certain gut bacteria, as a potential link between the microbiome and Alzheimer's disease by weakening the blood-brain barrier and promoting amyloid beta plaques and tau changes. In humans, higher ImP levels correlate with faster cognitive decline and elevated Alzheimer’s biomarkers; in mouse models, ImP worsens disease features. ImP-producing bacteria are present in many people but not highly abundant, and susceptibility depends on multiple factors. Targeting ImP or its production could become a therapeutic strategy rather than eliminating the bacteria.

via WIRED|

#alzheimers-disease #amyloid-beta #blood-brain-barrier

science14 days ago•5 min saved

Rare Flemish Alzheimer's mutation uncovers a novel amyloid fold fueling vascular brain damage

A rare Flemish APP mutation in Alzheimer's alters the folding of amyloid-beta into a previously unseen Z-shaped filament that tends to accumulate around brain vessels, driving cerebral amyloid angiopathy and hemorrhage. Using cryo-EM, researchers show how loss of a methyl group at residue 21 promotes this vascular-prone fold, offering new targets for therapies and broader insight into Alzheimer’s pathology across its variants.

via ScienceAlert|

#alzheimers-disease #amyloid-beta #cerebral-amyloid-angiopathy

science16 days ago•5 min saved

Blocking Brain Immune Cells Restores Sleep in Alzheimer’s-Model Mice

Researchers at the University of Kentucky found that sleep disruption in Alzheimer’s-model mice is driven by microglia-driven inflammation rather than amyloid plaques. When microglial activity was blocked, the mice gained about two extra hours of restorative sleep per night, although plaque levels did not change. This suggests that calming microglia could improve sleep and potentially slow disease progression, but the findings are currently limited to animal models.

via ScienceAlert|

#alzheimers-disease #amyloid-beta #microglia

science23 days ago•25 min saved

GLP-1 diabetes drugs might curb Alzheimer's brain plaques, review finds

A systematic review of preclinical studies and two small human trials suggests GLP-1 receptor agonists (such as liraglutide, dulaglutide, exenatide, semaglutide) consistently reduce Alzheimer’s-related proteins amyloid-beta and tau in lab and animal models, indicating potential for preventive effects. However, human data are limited and do not show cognitive reversal, so larger early-intervention trials are needed to determine if these diabetes/weight-loss drugs can prevent or slow Alzheimer's progression.

via PsyPost|

#alzheimers-disease #amyloid-beta #glp-1-receptor-agonists

health1 month ago•8 min saved

Autopsy reveals uneven brain clearance by Alzheimer's drug

A JAMA postmortem case study of a patient treated with aducanumab shows amyloid-beta plaques were cleared in some brain regions but persisted in others, suggesting uneven drug penetration and challenging the idea that removing amyloid always yields cognitive benefits. Some regions with reduced amyloid also had fewer tau tangles and slower atrophy, hinting at possible regional effects, but overall evidence for clinical improvement remains uncertain and ongoing trials are investigating whether earlier treatment could help.

via ScienceAlert|

#aducanumab #alzheimers #amyloid-beta

health1 month ago•7 min saved

Alzheimer’s May Begin with Adaptability Decline, Not Memory Loss

New mouse-model research shows cognitive flexibility—the ability to shift strategies—deteriorates before spatial memory in Alzheimer’s, linked to overactive corticostriatal circuits and reduced cholinergic interneuron activity. Quieting the overactive pathway improved adaptability and lowered amyloid-beta, suggesting early diagnostic and therapeutic targets focus on executive function rather than memory loss.

via SciTechDaily|

#alzheimers-disease #amyloid-beta #cognitive-flexibility

science1 month ago•8 min saved

Alcohol Triggers Opposite Brain Signals in Alzheimer’s Pathways

A Texas A&M study found that alcohol interacts with Alzheimer’s-related brain changes in a pathology-dependent way: in amyloid-beta models, alcohol reduces corticostriatal signaling and disrupts microglia responses, while in tau models it increases signaling along the same circuit. This challenges the idea of a simple additive risk and suggests individual brain responses to alcohol may hinge on a person’s specific pathology and disease stage.

via Neuroscience News|

#alcohol #alzheimers-disease #amyloid-beta

science1 month ago•2 min saved

Cognitive Flexibility May Act as Early Hint for Alzheimer’s, Study Finds

A Nature Communications study using 5xFAD mice shows cognitive flexibility is impaired before memory deficits, linked to hyperactivity in the medial prefrontal cortex; silencing overactive neurons reduces amyloid-beta accumulation and partially restores flexibility, suggesting a potential route to earlier Alzheimer’s diagnosis.

via Nautilus | Science|

#alzheimers-disease #amyloid-beta #cognitive-flexibility

science2 months ago•5 min saved

Copper drug reboots brain cleanup pumps to cut Alzheimer's proteins in mice

A copper-containing drug Cu(ATSM) boosted brain P-glycoprotein pumps, increased clearance of amyloid-beta by about 42%, and improved spatial memory by about 44% over 56 days in Alzheimer's-model mice, suggesting a potential preclinical approach to restore brain waste clearance, though human trials and safety assessments remain essential.

via ScienceAlert|

#alzheimers-disease #amyloid-beta #cuatsm

health2 months ago•3 min saved

Copper Drug Reboots Brain Cleanup, Reduces Alzheimer's Toxins and Restores Memory in Lab Study

Monash University researchers report in ACS Chemical Neuroscience that the copper compound Cu(ATSM) strengthens the brain's waste-clearing system by boosting P-glycoprotein pumps at the blood-brain barrier in an Alzheimer's model, reducing amyloid-beta by 42% and improving spatial memory by about 44% over 56 days, pointing to a therapy for neurovascular dysfunction; Cu(ATSM) has safety data from other neurological conditions, potentially speeding human testing, though exact clearance pathways and microglial involvement require further study.

via ScienceDaily|

#alzheimers-disease #amyloid-beta #blood-brain-barrier

science2 months ago•5 min saved

GRK2: A Fresh Target for Alzheimer’s Therapy Shows Promise in Mice

Scientists identify the enzyme GRK2, and its inactive form, as a new target in Alzheimer's disease. In mouse models and some human brain tissue, inactive GRK2 accumulates with mitochondria, boosting amyloid-beta production and harming mitochondrial function. The compound dubbed Compound 10 prevents GRK2 from clumping, restoring mitochondrial health, reducing amyloid-beta, and slowing dementia progression in mice, marking a potential new therapeutic avenue that still needs validation in humans.

via ScienceAlert|

#alzheimers #amyloid-beta #compound-10

science2 months ago•8 min saved

GRK2-targeting Compound 10 slows Alzheimer’s progression in mouse models

ETH Zurich researchers identified that inactivated GRK2 aggregates in dementia brains damage mitochondrial function and accelerate amyloid-beta production, creating a self-perpetuating cycle. They developed Compound 10 to prevent GRK2 aggregation, which improved mitochondrial energy, reduced amyloid-beta, and extended survival in Alzheimer’s mouse models, with additional systemic anti-aging benefits observed. The basic research is complete and a patent has been filed; industry partnership is sought to advance toward clinical development.

via Neuroscience News|

#alzheimers-disease #amyloid-beta #compound-10

science2 months ago•7 min saved

Microglial State Switch Reveals Dual Paths to Alzheimer’s Resilience

A human-brain study identifies six tissue domains and a pivotal transition in microglia from an amyloid-associated inflammatory state to a tau-associated antigen-presenting state; resilience against dementia arises via two routes—octogenarians who block progression and centenarians whose late microglial activation is uncoupled from tau—pointing to therapies that preserve early microglial responses or target pathways like TREM2 to delay cognitive decline.

via Neuroscience News|

#alzheimers-disease #amyloid-beta #microglia

science3 months ago•5 min saved

Nanoparticles Restore Brain Cleanup, Reversing Alzheimer’s Signs in Mice

Researchers used supramolecular nanoparticles that act as drugs to repair the brain's blood-brain barrier and restart its waste-clearance system. In mice with high amyloid-β, three injections reduced brain Aβ by 50–60% within an hour, with months-long vascular and cognitive improvements; the approach leverages the LRP1 transport system to reset clearance. While promising, the work is in animal studies and human trials remain years away.

via ScienceDaily|

#alzheimers-disease #amyloid-beta #blood-brain-barrier