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Delivery of Mycobacterium tuberculosis epitopes by Bordetella pertussis adenylate cyclase toxoid expands HLA-E-restricted cytotoxic CD8+ T cells
GD. Badami, MP. La Manna, P. Di Carlo, O. Stanek, I. Linhartova, N. Caccamo, P. Sebo, F. Dieli
Language English Country Switzerland
Document type Journal Article
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- MeSH
- Adenylyl Cyclases MeSH
- HLA-E Antigens MeSH
- Bordetella pertussis MeSH
- CD8-Positive T-Lymphocytes MeSH
- Epitopes MeSH
- Humans MeSH
- Histocompatibility Antigens Class I MeSH
- Mycobacterium tuberculosis * MeSH
- Peptides MeSH
- Toxoids MeSH
- Tuberculosis * prevention & control MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
INTRODUCTION: Tuberculosis (TB) remains the first cause of death from infection caused by a bacterial pathogen. Chemotherapy does not eradicate Mycobacterium tuberculosis (Mtb) from human lungs, and the pathogen causes a latent tuberculosis infection that cannot be prevented by the currently available Bacille Calmette Guerin (BCG) vaccine, which is ineffective in the prevention of pulmonary TB in adults. HLA-E-restricted CD8+ T lymphocytes are essential players in protective immune responses against Mtb. Hence, expanding this population in vivo or ex vivo may be crucial for vaccination or immunotherapy against TB. METHODS: The enzymatically inactive Bordetella pertussis adenylate cyclase (CyaA) toxoid is an effective tool for delivering peptide epitopes into the cytosol of antigen-presenting cells (APC) for presentation and stimulation of specific CD8+ T-cell responses. In this study, we have investigated the capacity of the CyaA toxoid to deliver Mtb epitopes known to bind HLA-E for the expansion of human CD8+ T cells in vitro. RESULTS: Our results show that the CyaA-toxoid containing five HLA-E-restricted Mtb epitopes causes significant expansion of HLA-E-restricted antigen-specific CD8+ T cells, which produce IFN-γ and exert significant cytotoxic activity towards peptide-pulsed macrophages. DISCUSSION: HLA-E represents a promising platform for the development of new vaccines; our study indicates that the CyaA construct represents a suitable delivery system of the HLA-E-binding Mtb epitopes for ex vivo and in vitro expansion of HLA-E-restricted CD8+ T cells inducing a predominant Tc1 cytokine profile with a significant increase of IFN-γ production, for prophylactic and immunotherapeutic applications against Mtb.
Central Laboratory of Advanced Diagnosis and Biomedical Research AOUP Paolo Giaccone Palermo Italy
Department of Biomedicine Neuroscience and Advanced Diagnosis University of Palermo Palermo Italy
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