Kunda, NK, Alfagih, IM, Hutcheon, GA, Saleem, IY, Miyaji, EN, Figueiredo, DB, Gonçalves, VM, Ferreira, DM, Dennison, SR and Somavarapu, S (2015) Pulmonary dry powder vaccine of pneumococcal antigen loaded nanoparticles. International Journal of Pharmaceutics, 495 (2). pp. 903-912. ISSN 0378-5173

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Abstract

Pneumonia, caused by Streptococcus pneumoniae, mainly affects the immunocompromised, the very young and the old, and remains one of the leading causes of death. A steady rise in disease numbers from non-vaccine serotypes necessitates a new vaccine formulation that ideally has better antigen stability and integrity, does not require cold-chain and can be delivered non-invasively. In this study, a dry powder vaccine containing an important antigen of S. pneumoniae, pneumococcal surface protein A (PspA) that has shown cross-reactivity amongst serotypes to be delivered via the pulmonary route has been formulated. The formulation contains the antigen PspA adsorbed onto the surface of polymeric nanoparticles encapsulated in l-leucine microparticles that can be loaded into capsules and delivered via an inhaler. We have successfully synthesized particles of ∼150 nm and achieved ∼20 μg of PspA adsorption per mg of NPs. In addition, the spray-dried powders displayed a FPF of 74.31 ± 1.32% and MMAD of 1.70 ± 0.03 μm suggesting a broncho-alveolar lung deposition facilitating the uptake of the nanoparticles by dendritic cells. Also, the PspA released from the dry powders maintained antigen stability (SDS-PAGE), integrity (Circular dichroism) and activity (lactoferrin binding assay). Moreover, the released antigen also maintained its antigenicity as determined by ELISA.

Item Type:	Article
Uncontrolled Keywords:	1115 Pharmacology And Pharmaceutical Sciences
Subjects:	R Medicine > RM Therapeutics. Pharmacology R Medicine > RS Pharmacy and materia medica
Divisions:	Pharmacy & Biomolecular Sciences
Publisher:	Elsevier
Date Deposited:	28 Oct 2015 09:18
Last Modified:	04 Sep 2021 13:51
DOI or ID number:	10.1016/j.ijpharm.2015.09.034
URI:	https://researchonline.ljmu.ac.uk/id/eprint/2256

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