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Hancock G, Blight J, Lopez-Camacho C, Kopycinski J, Pocock M, Byrne W, Price MJ, Kemlo P, Evans RI, Bloss A, Saunders K, Kirton R, Andersson M, Hellner K, Reyes-Sandoval A, Dorrell L. A multi-genotype therapeutic human papillomavirus vaccine elicits potent T cell responses to conserved regions of early proteins. Sci Rep 2019; 9:18713. [PMID: 31822717 PMCID: PMC6904585 DOI: 10.1038/s41598-019-55014-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 11/20/2019] [Indexed: 12/13/2022] Open
Abstract
Despite an efficacious prophylactic human papillomavirus (HPV) vaccine there is still a considerable global burden of HPV-related disease. Therapeutic vaccines that could prevent cancers in at-risk women are urgently needed. Most candidate therapeutic vaccines have focused on two high-risk (hr) HPV genotypes, 16 and 18, and two viral targets, E6 and E7, which may limit global coverage and efficacy. We designed the synthetic gene '5GHPV3' by selecting conserved regions from each of the six early proteins and generating consensus sequences to represent five hrHPV genotypes. 5GHPV3 was delivered by plasmid DNA, chimpanzee adenovirus (ChAdOx1) and modified vaccinia Ankara (MVA) vectors in prime-boost regimens to mice. ChAdOx1-5GHPV3 / MVA-5GHPV3 induced higher magnitude and more durable HPV-specific T cell responses than other regimens. Vaccine-induced T cells were polyfunctional and persisted at high frequencies for at least six weeks. Importantly, HPV-specific effector CD8 + T cells were detected in the cervix following systemic administration of ChAdOx1-5GHPV3 / MVA-5GHPV3 and increased in frequency over time, indicating continued trafficking of T cells to the cervix. Finally, T cells specific for 5GHPV3 encoded antigens were detected by IFN-γ Elispot in women with current or past hrHPV infections, confirming the presence of epitopes relevant to natural immune control.
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Affiliation(s)
- Gemma Hancock
- Nuffield Department of Medicine, University of Oxford and Oxford NIHR Biomedical Research Centre, NDM Research Building, Old Road Campus, Oxford, UK.
| | - Joshua Blight
- The Jenner Institute, Nuffield Department of Medicine, University of Oxford, The Henry Wellcome Building for Molecular Physiology, Roosevelt Drive, Oxford, UK
| | - Cesar Lopez-Camacho
- The Jenner Institute, Nuffield Department of Medicine, University of Oxford, The Henry Wellcome Building for Molecular Physiology, Roosevelt Drive, Oxford, UK
| | - Jakub Kopycinski
- Nuffield Department of Medicine, University of Oxford and Oxford NIHR Biomedical Research Centre, NDM Research Building, Old Road Campus, Oxford, UK
| | - Mamatha Pocock
- Nuffield Department of Medicine, University of Oxford and Oxford NIHR Biomedical Research Centre, NDM Research Building, Old Road Campus, Oxford, UK
| | - Wendy Byrne
- Direct Delivery Team, NIHR Clinical Research Network Thames Valley and South Midlands, Nuffield Orthopaedic Centre, Block 8, Oxford, OX3 7LD, UK
| | - Michael J Price
- Nuffield Department of Medicine, University of Oxford and Oxford NIHR Biomedical Research Centre, NDM Research Building, Old Road Campus, Oxford, UK
| | - Phillip Kemlo
- The Jenner Institute, Nuffield Department of Medicine, University of Oxford, The Henry Wellcome Building for Molecular Physiology, Roosevelt Drive, Oxford, UK
| | - Ranoromanana Ionitiana Evans
- Direct Delivery Team, NIHR Clinical Research Network Thames Valley and South Midlands, Nuffield Orthopaedic Centre, Block 8, Oxford, OX3 7LD, UK
| | - Angela Bloss
- Direct Delivery Team, NIHR Clinical Research Network Thames Valley and South Midlands, Nuffield Orthopaedic Centre, Block 8, Oxford, OX3 7LD, UK
| | - Kathryn Saunders
- Direct Delivery Team, NIHR Clinical Research Network Thames Valley and South Midlands, Nuffield Orthopaedic Centre, Block 8, Oxford, OX3 7LD, UK
| | - Richard Kirton
- Microbiology Department, Oxford University Hospital NHS Foundation Trust, Oxford, UK
| | - Monique Andersson
- Microbiology Department, Oxford University Hospital NHS Foundation Trust, Oxford, UK
| | - Karin Hellner
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Women's Centre, John Radcliffe Hospital, Oxford, UK
| | - Arturo Reyes-Sandoval
- The Jenner Institute, Nuffield Department of Medicine, University of Oxford, The Henry Wellcome Building for Molecular Physiology, Roosevelt Drive, Oxford, UK
| | - Lucy Dorrell
- Nuffield Department of Medicine, University of Oxford and Oxford NIHR Biomedical Research Centre, NDM Research Building, Old Road Campus, Oxford, UK
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Abstract
PURPOSE OF REVIEW Considerable HIV-1 vaccine development efforts have been deployed over the past decade. Put into perspective, the results from efficacy trials and the identification of correlates of risk have opened large and unforeseen avenues for vaccine development. RECENT FINDINGS The Thai efficacy trial, RV144, provided the first evidence that HIV-1 vaccine protection against HIV-1 acquisition could be achieved. The correlate of risk analysis showed that IgG antibodies against the gp120 V2 loop inversely correlated with a decreased risk of infection, whereas Env-specific IgA directly correlated with risk. Further clinical trials will focus on testing new envelope subunit proteins formulated with adjuvants capable of inducing higher and more durable functional antibody responses (both binding and broadly neutralizing antibodies). Moreover, vector-based vaccine regimens that can induce cell-mediated immune responses in addition to humoral responses remain a priority. SUMMARY Future efficacy trials will focus on prevention of HIV-1 transmission in heterosexual population in Africa and MSM in Asia. The recent successes leading to novel directions in HIV-1 vaccine development are a result of collaboration and commitment among vaccine manufacturers, funders, scientists and civil society stakeholders. Sustained and broad collaborative efforts are required to advance new vaccine strategies for higher levels of efficacy.
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Affiliation(s)
- Jean-Louis Excler
- U.S. Military HIV Research Program (MHRP), Bethesda, Maryland 20817, USA.
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