Cathepsin G Activity as a New Marker for Detecting Airway Inflammation by Microscopy and Flow Cytometry

Matteo Guerra, Dario Frey, Matthias Hagner, Susanne Dittrich, Michelle Paulsen, Marcus A. Mall, Carsten Schultz

Research output: Contribution to journalArticle

3 Scopus citations


Muco-obstructive lung diseases feature extensive bronchiectasis due to the uncontrolled release of neutrophil serine proteases into the airways. To assess if cathepsin G (CG) is a novel key player in chronic lung inflammation, we developed membrane-bound (mSAM) and soluble (sSAM) FRET reporters. The probes quantitatively revealed elevated CG activity in samples from 46 patients. For future basic science and personalized clinical applications, we developed a rapid, highly informative, and easily translatable small-molecule FRET flow cytometry assay for monitoring protease activity including cathepsin G. We demonstrated that mSAM distinguished healthy from patient cells by FRET-based flow cytometry with excellent correlation to confocal microscopy data.

Original languageEnglish (US)
JournalACS Central Science
StatePublished - Jan 1 2019


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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