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Nanobody-Based Apolipoprotein E Immunosensor for Point-of-Care Testing.

Xiang Ren1, Junrong Yan2, Dan Wu1

  • 1Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, Shandong, China.

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|September 9, 2017
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Summary

Researchers developed a novel colorimetric immunosensor for Alzheimer's disease (AD) detection. This point-of-care test accurately identifies Apolipoprotein E (ApoE), an early AD biomarker, with high sensitivity.

Keywords:
apolipoprotein Ecolorimetricimmunosensornanobodypoint-of-care testing

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Area of Science:

  • Biomarker Discovery and Diagnostics
  • Nanotechnology in Medicine
  • Neurodegenerative Disease Research

Background:

  • Alzheimer's disease (AD) diagnosis relies on identifying specific biomarkers.
  • Apolipoprotein E (ApoE) is recognized as an early indicator for AD in clinical settings.
  • Current diagnostic methods may lack the sensitivity or point-of-care accessibility for early detection.

Purpose of the Study:

  • To develop a novel, highly sensitive colorimetric immunosensor for Apolipoprotein E (ApoE) detection.
  • To enable point-of-care testing (POCT) for early Alzheimer's disease (AD) diagnosis.
  • To utilize novel nanobodies (Nbs) for enhanced immunosensor performance.

Main Methods:

  • Generation of ApoE-specific nanobodies (Nbs) through bactrian camel immunization and phage display.
  • Development of a colorimetric immunosensor using layer-by-layer nanoassembly techniques.
  • Utilizing oriented Nbs as capture and detection antibodies for detecting ApoE via H2O2-mediated oxidation and color change.

Main Results:

  • Successfully isolated high-affinity ApoE-specific nanobodies (Nbs).
  • Developed an easily operated, on-site immunosensor with a low detection limit of 0.42 pg/mL for ApoE.
  • Demonstrated good performance in clinical analysis, indicating potential for AD diagnosis.

Conclusions:

  • A novel colorimetric immunosensor for ApoE detection has been successfully developed.
  • The developed immunosensor shows high sensitivity and good clinical performance for AD biomarker detection.
  • This technology holds potential for clinical diagnosis and real-time monitoring of Alzheimer's disease.