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Deposition and transport of linezolid mediated by a synthetic surfactant Synsurf® within a pressurized metered dose inhaler: a Calu-3 model

Authors van Rensburg L, van Zyl JM, Smith J

Received 22 July 2017

Accepted for publication 8 December 2017

Published 4 May 2018 Volume 2018:12 Pages 1107—1118


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Georgios D. Panos

Lyné van Rensburg,1 Johann M van Zyl,1 Johan Smith2

1Division of Clinical Pharmacology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa; 2Department of Pediatrics, Tygerberg Children’s Hospital, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa

Background: Previous studies in our laboratory demonstrated that a synthetic peptide containing lung surfactant enhances the permeability of chemical compounds through bronchial epithelium. The purpose of this study was to test two formulations of Synsurf® combined with linezolid as respirable compounds using a pressurized metered dose inhaler (pMDI).
Methods: Aerosolization efficiency of the surfactant-drug microparticles onto Calu-3 monolayers as an air interface culture was analyzed using a Next Generation Impactor™.
Results: The delivered particles and drug dose showed a high dependency from the preparation that was aerosolized. Scanning electron microscopy imaging allowed for visualization of the deposited particles, establishing them as liposomal-type structures (diameter 500 nm to 2 µm) with filamentous features.
Conclusion: The different surfactant drug combinations allow for an evaluation of the significance of the experimental model system, as well as assessment of the formulations providing a possible noninvasive, site-specific, delivery model via pMDI.

Keywords: Calu-3, pMDI, linezolid, delivery vehicle, pulmonary surfactant, aerosolized particles

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