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Lai L, Rouphael N, Xu Y, Kabbani S, Beck A, Sherman A, Anderson EJ, Bellamy A, Weiss J, Cross K, Mulligan MJ. An Oil-in-Water adjuvant significantly increased influenza A/H7N9 split virus Vaccine-Induced circulating follicular helper T (cT FH) cells and antibody responses. Vaccine 2022; 40:7065-7072. [PMID: 36273986 DOI: 10.1016/j.vaccine.2022.09.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 04/09/2022] [Accepted: 09/12/2022] [Indexed: 11/15/2022]
Abstract
BACKGROUND Unadjuvanted A/H7N9 vaccines are poorly immunogenic. The immune response is improved with the addition of MF59, an oil-in-water adjuvant. However, the cellular immunologic responses of MF59-adjuvanted A/H7N9 vaccine are not fully understood. METHODS 37 participants were vaccinated with 2 doses of 2013 influenza A/H7N9 vaccine (at Days 1 and 21) with or without MF59 and enrolled in an immunology substudy. Responses were assessed at multiple timepoints (Days 0, 8, 21, 29, and 42) for hemagglutination inhibition (HAI) and neutralizing antibody (Neut) assays, memory B cell responses by enzyme-linked ImmunoSpot; circulating follicular helper T cells (cTFH) and CD4 + T cells by intracellular cytokine staining. RESULTS MF59-adjuvanted influenza A/H7N9 vaccine induced significantly higher hemagglutination inhibition (HAI) and neutralizing antibody (Neut) responses when compared to unadjuvanted vaccine. The adjuvanted vaccine elicited significantly higher levels of Inducible T-cell Co-Stimulator (ICOS) expression by CXCR3+CXCR5+CD4+ cTFH cells, compared to unadjuvanted vaccine. The magnitude of increase in cTFH cells (from baseline to Day 8) and in IL-21 expressing CD154+CD4+ T cells (from baseline to Days 8 and 21) correlated with HAI (at Day 29) and Neut antibody (at Days 8 and 29) titers. The increase in frequency of IL-21 expressing CD154+CD4+T cells (from baseline to Day 21) correlated with memory B cell frequency (at Day 42). CONCLUSION cTFH activation is associated with HAI and Neut responses in recipients of MF59-adjuvanted influenza A/H7N9 vaccine relative to unadjuvanted vaccine. Future studies should focus on optimizing the cTFH response and use cTFH as an early biomarker of serological response to vaccination. This trial was registered at clinicaltrials.gov, trial number NCT01938742.
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Affiliation(s)
- Lilin Lai
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030
| | - Nadine Rouphael
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030.
| | - Yongxian Xu
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030
| | - Sarah Kabbani
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030
| | - Allison Beck
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030
| | - Amy Sherman
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030
| | - Evan J Anderson
- Departments of Pediatrics and Medicine, Emory University School of Medicine and Children's Healthcare of Atlanta, 2015 Uppergate
| | - Abbie Bellamy
- EMMES Corporation, 401, North Washington Street, Suite 700, Rockville, MD 20850, USA
| | - Julia Weiss
- EMMES Corporation, 401, North Washington Street, Suite 700, Rockville, MD 20850, USA
| | - Kaitlyn Cross
- EMMES Corporation, 401, North Washington Street, Suite 700, Rockville, MD 20850, USA
| | - Mark J Mulligan
- Hope Clinic of the Emory Vaccine Center, Division of Infectious Diseases, Department of Medicine, Emory University, 500, Irvin Court, Decatur GA 30030
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