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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Melanie Cw Campbell1, Lyndsy Acheson1, Erik L Mason1

  • 1University of Waterloo, Waterloo, ON, Canada.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
PubMed
Summary
This summary is machine-generated.

Non-invasive retinal imaging detects protein deposits linked to neurodegenerative diseases like Alzheimer's and those involving TDP-43. This method offers a cost-effective, dye-free diagnostic tool for early disease detection and intervention.

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Area of Science:

  • Ophthalmology and Neurology
  • Biomarker Discovery
  • Medical Diagnostics

Background:

  • Non-invasive retinal imaging using polarized light can identify protein deposits that predict brain pathology.
  • Previous studies differentiated retinal deposits in Alzheimer's disease (AD) from alpha-synuclein-related neurodegenerative diseases (NDDs).
  • This study investigates polarized light interactions in deposits involving TDP-43, comparing them to amyloid deposits in AD.

Purpose of the Study:

  • To compare polarized light interactions of retinal deposits associated with TDP-43 proteinopathies (ALS/FTLD) with those of amyloid deposits in Alzheimer's disease (AD).
  • To evaluate the potential of this technique as an inexpensive, dye-free, differential diagnostic tool for neurodegenerative diseases.
  • To enable earlier and more appropriate treatments by facilitating differential diagnosis.

Main Methods:

  • Retinal imaging using polarized light was performed on samples from individuals with ALS, FTLD, and AD.
  • Deposits presumed to be amyloid beta (in AD) and TDP-43 (in ALS/FTLD) were imaged.
  • Nine different polarized light interactions were calculated for each deposit and compared between disease groups.

Main Results:

  • Retinal deposits consistent with AD (amyloid beta) and ALS/FTLD (TDP-43) were visualized using polarized light.
  • Significant differences in multiple polarized light interactions were observed between AD and TDP-43 retinal deposits.
  • Some overlap in interaction strengths and deposit areas suggests potential for combined diagnostic markers.

Conclusions:

  • Distinct polarized light interactions correlate with different protein deposits (amyloid vs. TDP-43) in the retina, mirroring brain pathology.
  • Combining these interactions may lead to early, non-invasive, and cost-effective differential diagnoses for neurodegenerative diseases.
  • This approach holds promise for diagnosing conditions involving amyloid beta, alpha-synuclein, and TDP-43.