Cystic Fibrosis Mucus Model to Design More Efficient Drug Therapies

Area of Science:

• Pharmacology
• Biophysics
• Drug Delivery

Background:

• Mucus presents a significant challenge for oral and pulmonary drug delivery, particularly in mucus-related disorders.
• Understanding drug diffusion through mucus is crucial for developing effective therapeutics.

Purpose of the Study:

• To investigate the impact of mucus on the passive diffusion of various commercial drugs.
• To evaluate a novel in vitro mucus model for drug permeability assessment.
• To identify strategies for enhancing drug permeability through mucus barriers.

Main Methods:

• Development of an in vitro mucus model using cystic fibrosis (CF) mucus.
• Coupling the mucus model with a parallel artificial membrane permeability assay (PAMPA).
• Testing the passive diffusion of 45 commercial drugs with diverse physicochemical properties.

Main Results:

• The mucus model demonstrated an interactive filtering effect, not just a physical barrier.
• Mucus reduced the diffusion of approximately half of the tested drug compounds.
• Drug permeability was enhanced when drugs were formulated as calcium salts, confirmed with ex vivo CF sputum.

Conclusions:

• The developed mucus platform serves as an efficient in vitro tool for early assessment of drug candidates.
• Identifying drugs sensitive to mucus barriers can help reduce late-stage failures in drug discovery.
• Formulating drugs as calcium salts is a potential strategy to overcome mucus-related delivery challenges.