Simple image-based no-wash method for quantitative detection of surface expressed CFTR.

Area of Science:

• Biochemistry
• Genetics
• Cell Biology

Background:

• Cystic fibrosis (CF) is a lethal genetic disorder caused by mutations in the CF Transmembrane Conductance Regulator (CFTR) gene.
• The most common mutation, F508del-CFTR, leads to protein misfolding and impaired trafficking to the cell surface, resulting in CF pathology.
• Current CFTR drug discovery assays have limitations, including multiple wash steps and low efficacy of identified small molecules.

Purpose of the Study:

• To develop a novel, high-throughput, no-wash assay for screening CFTR modulators.
• To facilitate the discovery of more efficacious drugs for cystic fibrosis by improving the detection of corrected CFTR trafficking.
• To provide a versatile platform for studying other diseases caused by membrane protein folding and trafficking defects.

Main Methods:

• Development of cell lines and tools to report CFTR trafficking correction.
• Adaptation of the assay to a 96-well format for high-throughput screening.
• Implementation of a no-wash protocol for simplified and rapid detection of cell surface CFTR.

Main Results:

• A new, simple, no-wash assay for detecting F508del-CFTR at the cell surface has been established.
• The assay is amenable to high-throughput screening in a 96-well format.
• This platform shows potential for discovering more effective CFTR-targeting drugs.

Conclusions:

• The developed no-wash assay offers a significant improvement over existing methods for CF drug discovery.
• This assay could accelerate the identification of novel therapeutics for cystic fibrosis.
• The modular design allows for potential application to other genetic disorders involving protein trafficking defects.