Calf Lung Surfactant Recovers Surface Functionality After Exposure to Aerosols Containing Polymeric Particles

Area of Science:

• Pulmonary medicine
• Biophysics
• Materials science

Background:

• Colloidal particles can disrupt lung surfactant properties and function.
• Mechanisms of aerosol-surfactant interactions are poorly understood due to limited exposure methods.
• A method to reproducibly apply quantifiable particle doses to lung surfactant films was needed.

Purpose of the Study:

• Develop a method for reproducible aerosol application of particles to lung surfactant films.
• Investigate particle-induced changes in surfactant interfacial properties.
• Mimic in vivo conditions for aerosol-surfactant interaction studies.

Main Methods:

• Lung surfactant films (DPPC and Infasurf®) were exposed to polystyrene particle aerosols.
• Particle dose was quantified using light absorbance.
• Interfacial properties were measured using a Langmuir-Wilhelmy balance under compression-expansion cycles.

Main Results:

• Reproducible particle dosing on surfactant films was achieved.
• Particle deposition caused minor changes in collapse pressure and area for both surfactants.
• Infasurf® function was temporarily inhibited, but restored after five compression-expansion cycles, unlike DPPC.

Conclusions:

• Infasurf® demonstrated rapid functional recovery after aerosol particle exposure under simulated in vivo conditions.
• Particle-induced surfactant inhibition is unlikely to be a significant issue in vivo following aerosol exposure.
• The study provides a novel method for aerosol-surfactant interaction research.