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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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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.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
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Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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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.

Marianna Rizzo1, Charlotte E Teunissen2, Frederic Brosseron3

  • 1Alzheimer Center Limburg, School for Mental Health and Neuroscience, Maastricht University, Maastricht, Netherlands.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

The complement system is involved in neurodegenerative diseases like Alzheimer's and Parkinson's. Complement factors link with key biomarkers such as amyloid and alpha-synuclein, indicating its role in disease pathology.

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Area of Science:

  • Neuroscience
  • Immunology
  • Biochemistry

Background:

  • The complement system's role in neurodegenerative diseases like Alzheimer's (AD), dementia with Lewy bodies (DLB), and Parkinson's (PD) is suggested but not fully understood.
  • The association between complement factors and core disease biomarkers (amyloid, tau, NfL, α-synuclein) in cerebrospinal fluid (CSF) requires further investigation.

Purpose of the Study:

  • To investigate the relationship between CSF complement factors and established biomarkers of neurodegeneration (amyloid-beta 42/40 ratio, phosphorylated tau 181, neurofilament light chain, and alpha-synuclein).
  • To explore potential disease-specific associations of complement factors in AD, DLB, PD, and control groups.

Main Methods:

  • Analysis of CSF samples from 321 participants (AD, DLB, PD, controls) from the EPND study.
  • Quantification of CSF biomarkers (Aβ42/40, p-tau181, NfL, α-syn) and 14 complement factors.
  • Linear regression models adjusted for age and sex, with post-hoc analysis based on Mini-Mental State Examination (MMSE) scores.

Main Results:

  • Complement factors showed differential associations with biomarkers across diseases.
  • Amyloid-beta 42/40 levels correlated with specific complement factors in controls and AD, but not DLB or PD.
  • Phosphorylated tau 181, NfL, and α-synuclein exhibited broader associations with complement factors, with some disease-specific patterns observed for α-synuclein in PD.

Conclusions:

  • CSF complement factors are associated with key neurodegenerative biomarkers, supporting the complement system's involvement in AD, DLB, and PD.
  • Disease-specific relationships were identified between complement and amyloid in AD, and between complement and α-synuclein in PD.