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Layer-by-layer nanocoating of live Bacille-Calmette-Guérin mycobacteria with poly(I:C) and chitosan enhances pro-inflammatory activation and bactericidal capacity in murine macrophages.
- Source :
-
Biomaterials [Biomaterials] 2016 Dec; Vol. 111, pp. 1-12. Date of Electronic Publication: 2016 Sep 30. - Publication Year :
- 2016
-
Abstract
- Tuberculosis (TB) is a major disease burden globally causing more than 1.5 million deaths per year. The attenuated live vaccine strain Bacille Calmette-Guérin (BCG), although providing protection against childhood TB, is largely ineffective against adult pulmonary TB. A major aim therefore is to increase the potency of the BCG vaccine to generate stronger and more sustained immunity against TB. Here, we investigated the use of layer-by-layer (LbL) nanocoating of the surface of live BCG with several layers of polyinosinic-polycytidylic acid (poly(I:C)), a strong inducer of cell-mediated immunity, and the biodegradable polysaccharide chitosan to enhance BCG immunogenicity. Nanocoating of live BCG did not affect bacterial viability or growth in vitro but induced killing of the BCG in infected mouse bone marrow-derived macrophages and enhanced macrophage production of pro-inflammatory cytokines and expression of surface co-stimulatory molecules relative to uncoated BCG. In addition, poly(I:C) surface-coated BCG, but not BCG alone or together with soluble poly(I:C), induced high production of nitric oxide (NO) and IL-12. These results argue that BCG and surface absorbed poly(I:C) act in a synergistic manner to elicit pro-inflammatory macrophage activation. In conclusion, nanocoating of live BCG with the immunostimulatory agent poly(I:C) may be an appropriate strategy to enhance and modulate host responses to the BCG vaccine.<br /> (Copyright © 2016 Elsevier Ltd. All rights reserved.)
- Subjects :
- Animals
BCG Vaccine chemical synthesis
Cells, Cultured
Coated Materials, Biocompatible
Macrophage Activation drug effects
Macrophages drug effects
Mice
Mice, Inbred C57BL
Mycobacterium bovis chemistry
Mycobacterium bovis isolation & purification
Nanocapsules administration & dosage
Nanocapsules chemistry
Poly I-C
Anti-Bacterial Agents administration & dosage
Anti-Bacterial Agents chemistry
BCG Vaccine administration & dosage
Macrophage Activation immunology
Macrophages immunology
Macrophages microbiology
Mycobacterium bovis immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1878-5905
- Volume :
- 111
- Database :
- MEDLINE
- Journal :
- Biomaterials
- Publication Type :
- Academic Journal
- Accession number :
- 27716523
- Full Text :
- https://doi.org/10.1016/j.biomaterials.2016.09.027