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Micropatterned surfaces functionalized with electroactive peptides for detecting protease release from cells.

Dong-Sik Shin1, Ying Liu, Yandong Gao

  • 1Department of Biomedical Engineering, University of California, Davis, 95616, United States.

Analytical Chemistry
|November 28, 2012
PubMed
Summary

A novel electrochemical biosensor detects matrix metalloproteinase-9 (MMP9) activity. This peptide-based sensor shows promise for diagnosing diseases linked to MMP9, such as cancer and fibrosis.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Matrix metalloproteinases (MMPs) are crucial enzymes regulating the extracellular matrix.
  • MMP9, a specific MMP, is implicated in cancer, fibrosis, and wound healing.
  • Accurate detection of MMP9 activity is vital for disease diagnosis and research.

Purpose of the Study:

  • To develop a novel peptide-based electrochemical biosensor for detecting matrix metalloproteinase-9 (MMP9) activity.
  • To integrate this biosensor with microfluidic devices for detecting cell-secreted MMP9.
  • To explore the broad applicability of this sensing strategy for other proteases.

Main Methods:

  • A peptide specific to MMP9 was labeled with methylene blue (MB) and immobilized on gold electrodes.
  • Electrochemical detection of MMP9 activity was performed using square wave voltammetry (SWV).
  • Microfluidic devices with patterned surfaces were fabricated to culture monocytes and detect cell-secreted MMP9.

Main Results:

  • The biosensor achieved a limit of detection of 60 pM for MMP9 with a linear range up to 50 nM.
  • Activated U-937 monocytes showed a 3-fold higher electrochemical signal compared to nonactivated monocytes.
  • The developed platform demonstrated potential for detecting cell-secreted MMP9 in a microfluidic system.

Conclusions:

  • The novel peptide-based electrochemical biosensor offers a sensitive method for MMP9 activity detection.
  • This technology has potential applications in clinical diagnostics and basic science research.
  • The sensing strategy is adaptable for detecting various proteases involved in physiological and pathological processes.