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Calf Lung Surfactant Recovers Surface Functionality After Exposure to Aerosols Containing Polymeric Particles
Journal article   Open access   Peer reviewed

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

Amir M Farnoud and Jennifer Fiegel
Journal of aerosol medicine and pulmonary drug delivery, Vol.29(1), pp.10-23
02/01/2016
DOI: 10.1089/jamp.2014.1165
PMCID: PMC4770845
PMID: 25671772
url
https://doi.org/10.1089/jamp.2014.1165View
Published (Version of record) Open Access

Abstract

Background: Recent studies have shown that colloidal particles can disrupt the interfacial properties of lung surfactant and thus key functional abilities of lung surfactant. However, the mechanisms underlying the interactions between aerosols and surfactant films remain poorly understood, as our ability to expose films to particles via the aerosol route has been limited. The aim of this study was to develop a method to reproducibly apply aerosols with a quantifiable particle dose on lung surfactant films and investigate particle-induced changes to the interfacial properties of the surfactant under conditions that more closely mimic those in vivo . Methods: Films of DPPC and Infasurf ® were exposed to aerosols containing polystyrene particles generated using a Dry Powder Insufflator ™ . The dose of particles deposited on surfactant films was determined via light absorbance. The interfacial properties of the surfactant were studied using a Langmuir-Wilhelmy balance during surfactant compression to film collapse and cycles of surface compression and expansion at a fast cycling rate within a small surface area range. Results: Exposure of surfactant films to aerosols led to reproducible dosing of particles on the films. In film collapse experiments, particle deposition led to slight changes in collapse surface pressure and surface area of both surfactants. However, longer interaction times between particles and Infasurf ® films resulted in time-dependent inhibition of surfactant function. When limited to lung relevant surface pressures, particles reduced the maximum surface pressure that could be achieved. This inhibitory effect persisted for all compression-expansion cycles in DPPC, but normal surfactant behavior was restored in Infasurf ® films after five cycles. Conclusions: The observation that Infasurf ® was able to quickly restore its function after exposure to aerosols under conditions that better mimicked those in vivo suggests that particle-induced surfactant inhibition is unlikely to occur in vivo due to an aerosol exposure.
 aerosol Infasurf nanoparticles Original Research surface tension surfactant inhibition

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