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Nanosensors to Detect Protease Activity In Vivo for Noninvasive Diagnostics
10:50

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Published on: July 16, 2018

Sensor materials for the detection of proteases.

Jacqueline L Stair1, Michael Watkinson, Steffi Krause

  • 1School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom.

Biosensors & Bioelectronics
|December 26, 2008
PubMed
Summary

This study explores generic sensor materials for protease detection using peptide cross-linked dextran hydrogels. The novel sensors demonstrate tunable degradation rates and high specificity for enzymes like human neutrophil elastase (HNE).

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Area of Science:

  • Biomaterials Science
  • Chemical Engineering
  • Biochemistry

Background:

  • Protease detection is crucial in diagnostics and research.
  • Existing sensor technologies often lack specificity or tunability.
  • Dextran hydrogels offer a versatile platform for biosensor development.

Purpose of the Study:

  • To develop generic and tunable sensor materials for protease detection.
  • To investigate the degradation of peptide cross-linked dextran hydrogels.
  • To utilize quartz crystal microbalance (QCM) for monitoring hydrogel film degradation.

Main Methods:

  • Hydrogel cross-links were formed using imine linkages between oxidized dextran and protease-cleavable peptides.
  • Sensor response was monitored using quartz crystal microbalance (QCM).
  • Two protease/peptide pairs were tested: human neutrophil elastase (HNE)/AAPVAAK and cathepsin G/AAPFFK.

Main Results:

  • A direct correlation between hydrogel degradation rate and protease activity was observed.
  • HNE activities from 2.5 to 30 U/mL were detected with 25% cross-linked films.
  • Increasing cross-linking density from 25% to 75% enhanced degradation rate by 3.5-fold.
  • QCM data indicated increased film viscoelasticity upon enzyme addition.
  • High specificity was demonstrated by low cross-sensitivity when swapping protease/peptide pairs.

Conclusions:

  • Peptide cross-linked dextran hydrogels provide a versatile and tunable platform for protease sensing.
  • The developed sensor materials exhibit rapid response times and high specificity.
  • This approach offers a promising strategy for developing generic protease detection systems.