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

ABSTRACT: 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.

SUBMITTER: Guerra M 

PROVIDER: S-EPMC6439450 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature