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Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Related Experiment Video

Updated: Jul 9, 2025

A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis
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Get moving to clear β-amyloid.

Leslie K Ferrarelli1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|December 5, 2023
PubMed
Summary

Physical exercise boosts brain health by triggering the secretion of a key enzyme. This enzyme actively breaks down beta-amyloid, a protein linked to cognitive decline.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Exercise Physiology

Background:

  • Beta-amyloid accumulation in the brain is a hallmark of neurodegenerative diseases.
  • Maintaining cognitive function is a major public health concern.
  • The impact of physical activity on brain biochemistry is an area of active research.

Purpose of the Study:

  • To investigate the direct biochemical effects of physical exercise on the brain.
  • To identify specific enzymes involved in beta-amyloid clearance stimulated by exercise.

Main Methods:

  • Analysis of brain cell secretions following a standardized physical exercise protocol.
  • Biochemical assays to quantify enzyme activity and protein degradation.

Main Results:

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  • Physical exercise significantly stimulated the secretion of a specific enzyme from brain cells.
  • This enzyme demonstrated potent beta-amyloid-degrading activity in vitro.
  • Exercise-induced enzyme levels correlated with enhanced beta-amyloid clearance.

Conclusions:

  • Physical exercise promotes the brain's natural defense against beta-amyloid buildup.
  • This finding highlights a novel mechanism through which exercise supports brain health.
  • Targeting this enzyme pathway could offer therapeutic strategies for cognitive disorders.