Particulate Mycobacterial Vaccines Induce Protective Immunity against Tuberculosis in Mice

Particulate Mycobacterial Vaccines Induce Protective Immunity against Tuberculosis in Mice.

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Item Type: Article
Status: Published
Official URL:
Journal or Publication Title: Nanomaterials
Volume: 11
Number: 8
Page Range: p. 2060
Date: 13 August 2021
Divisions: Tuberculosis
Depositing User: General Admin
Identification Number: 10.3390/nano11082060
ISSN: 2079-4991
Date Deposited: 10 Oct 2021 10:46

Currently available vaccines fail to provide consistent protection against tuberculosis (TB). New, improved vaccines are urgently needed for controlling the disease. The mycobacterial antigen fusions H4 (Ag85B-TB10.4) and H28 (Ag85B-TB10.4-Rv2660c) have been shown to be very immunogenic and have been considered as potential candidates for TB vaccine development. However, soluble protein vaccines are often poorly immunogenic, but augmented immune responses can be induced when selected antigens are delivered in particulate form. This study investigated whether the mycobacterial antigen fusions H4 and H28 can induce protective immunity when assembled into particulate vaccines (polyester nanoparticle-H4, polyester nanoparticle-H28, H4 nanoparticles and H28 nanoparticles). The particulate mycobacterial vaccines were assembled inside an engineered endotoxin-free production strain of Escherichia coli at high yield. Vaccine nanoparticles were purified and induced long-lasting antigen-specific T cell responses and protective immunity in mice challenged by aerosol with virulent Mycobacterium tuberculosis. A significant reduction of M. tuberculosis CFU, up to 0.7-log10 protection, occurred in the lungs of mice immunized with particulate vaccines in comparison to placebo-vaccinated mice (p < 0.0001). Polyester nanoparticles displaying the mycobacterial antigen fusion H4 induced a similar level of protective immunity in the lung when compared to M. bovis bacillus Calmette-Guérin (BCG), the currently approved TB vaccine. The safe and immunogenic polyester nanoparticle-H4 vaccine is a promising subunit vaccine candidate, as it can be cost-effectively manufactured and efficiently induces protection against TB.

Keywords: antigen nanoparticles; bioengineering; particulate vaccines; polyester nanoparticle; protective immunity; self-assembly; tuberculosis.

Chen, Shuxiong
Quan, Diana H.
Wang, Xiaonan T.
Sandford, Sarah
Kirman, Joanna R.
Britton, Warwick J.
Rehm, Bernd H. A.
Last Modified: 10 Oct 2021 10:46

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