A map of signaling responses in the human airway epithelium

Area of Science:

• Cell Biology
• Regenerative Medicine
• Systems Biology

Background:

• Receptor-mediated signaling is crucial for tissue regeneration but often dysregulated in diseases like lung disease.
• Understanding these signaling pathways in human tissues is key to developing new therapies.

Purpose of the Study:

• To create a comprehensive signaling-response map for the human airway epithelium.
• To identify how specific signaling pathways influence epithelial cell types and phenotypes.
• To uncover the molecular underpinnings of aberrant cell states in lung diseases.

Main Methods:

• Organotypic cultures of human airway epithelium were treated with 17 different receptor-mediated signaling pathways.
• Changes in epithelial cell abundance and phenotype were analyzed.
• A signaling-response map was constructed to visualize pathway interactions and cellular outcomes.

Main Results:

• The map successfully recapitulated known airway epithelial responses to signaling pathways.
• Identified convergent cellular states induced by multiple ligands and diverse, ligand-specific responses.
• Demonstrated that while pathway-induced differentiation loss correlates with cell-cycle arrest, it doesn't fully block differentiation.
• Linked specific aberrant cells in lung diseases to transforming growth factor beta 1 (TGFB1) signaling.
• Identified interferon pathway responses in COVID-19 patient samples.

Conclusions:

• The developed signaling-response map provides a systematic framework for evaluating tissue signaling.
• This map can help elucidate the mechanisms behind aberrant cell states in various lung diseases.
• Findings offer insights into regenerative processes and disease pathogenesis in the airway epithelium.