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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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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Alena Marie Smith1, Sara A Lorkiewicz1, Laia Montoliu-Gaya2

  • 1Stanford University School of Medicine, Stanford, CA, USA.

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|December 26, 2025
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Summary
This summary is machine-generated.

Plasma biomarkers, including pTau217, accurately detect amyloid-beta (Aβ) pathology in individuals with alpha-synucleinopathy (αSyn). This finding supports their use in clinical trials for related neurodegenerative diseases.

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Area of Science:

  • Neuroscience
  • Biomarker Discovery
  • Neurodegenerative Diseases

Background:

  • Coexisting neuropathologies like amyloidosis (Aβ), tauopathy, and alpha-synucleinopathy (αSyn) complicate neurodegenerative disease diagnosis and treatment.
  • Understanding plasma biomarker performance in the presence of multiple pathologies is crucial for accurate diagnosis and personalized medicine.

Purpose of the Study:

  • To investigate the diagnostic accuracy of plasma biomarkers for detecting Aβ pathology in individuals with and without αSyn pathology.
  • To evaluate the utility of plasma biomarkers in differentiating neurodegenerative disease subtypes.

Main Methods:

  • Analyzed five plasma biomarkers (pTau181, pTau217, Aβ42/40, GFAP, NfL) in 180 participants.
  • Determined αSyn and Aβ status using CSF SAAmplify-αSYN test and Aβ42/40 ratio.
  • Utilized ROC curve analyses to assess diagnostic accuracies in predicting Aβ status, comparing results between αSyn+ and αSyn- groups.

Main Results:

  • Plasma pTau181, pTau217, Aβ42/40, and GFAP were elevated in Aβ+ groups, irrespective of αSyn status.
  • Plasma pTau217 demonstrated the highest accuracy (AUC up to 0.92) for detecting Aβ in αSyn+ individuals.
  • Plasma NfL accuracy for Aβ detection improved in αSyn- participants when including age, sex, and APOE4 status.

Conclusions:

  • Plasma pTau217 is a reliable biomarker for detecting Aβ in individuals with αSyn pathology.
  • These findings suggest plasma pTau217 can aid in screening and stratifying patients for clinical trials targeting alpha-synucleinopathies.