1
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Parks OB, Antos D, Eddens T, Walters S, Johnson M, Oury TD, Gottschalk RA, Erickson JJ, Williams JV. PD-1 Impairs CD8+ T Cell Granzyme B Production in Aged Mice during Acute Viral Respiratory Infection. Immunohorizons 2023; 7:771-787. [PMID: 38015461 PMCID: PMC10696419 DOI: 10.4049/immunohorizons.2300094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 11/01/2023] [Indexed: 11/29/2023] Open
Abstract
CD8+ T cell dysfunction contributes to severe respiratory viral infection outcomes in older adults. CD8+ T cells are the primary cell type responsible for viral clearance. With increasing age, CD8+ T cell function declines in conjunction with an accumulation of cytotoxic tissue-resident memory (TRM) CD8+ T cells. We sought to elucidate the role of PD-1 signaling on aged CD8+ T cell function and accumulation of CD8+ TRM cells during acute viral respiratory tract infection, given the importance of PD-1 regulating CD8+ T cells during acute and chronic infections. PD-1 blockade or genetic ablation in aged mice yielded improved CD8+ T cell granzyme B production comparable to that in young mice during human metapneumovirus and influenza viral infections. Syngeneic transplant and adoptive transfer strategies revealed that improved granzyme B production in aged Pdcd1-/- CD8+ T cells was primarily cell intrinsic because aged wild-type CD8+ T cells did not have increased granzyme B production when transplanted into a young host. PD-1 signaling promoted accumulation of cytotoxic CD8+ TRM cells in aged mice. PD-1 blockade of aged mice during rechallenge infection resulted in improved clinical outcomes that paralleled reduced accumulation of CD8+ TRM cells. These findings suggest that PD-1 signaling impaired CD8+ T cell granzyme B production and contributed to CD8+ TRM cell accumulation in the aged lung. These findings have implications for future research investigating PD-1 checkpoint inhibitors as a potential therapeutic option for elderly patients with severe respiratory viral infections.
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Affiliation(s)
- Olivia B. Parks
- Division of Infectious Diseases, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Danielle Antos
- Division of Pulmonology, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Taylor Eddens
- Division of Allergy/Immunology, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Sara Walters
- Division of Infectious Diseases, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Monika Johnson
- Division of Infectious Diseases, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Tim D. Oury
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Rachel A. Gottschalk
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - John J. Erickson
- Division of Neonatology and Pulmonary Biology, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, University of Cincinnati School of Medicine, Cincinnati, OH
| | - John V. Williams
- Division of Infectious Diseases, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Institute for Infection, Inflammation, and Immunity in Children (i4Kids), Pittsburgh, PA
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2
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Parks OB, Eddens T, Sojati J, Lan J, Zhang Y, Oury TD, Ramsey M, Erickson JJ, Byersdorfer CA, Williams JV. Terminally exhausted CD8 + T cells contribute to age-dependent severity of respiratory virus infection. Immun Ageing 2023; 20:40. [PMID: 37528458 PMCID: PMC10391960 DOI: 10.1186/s12979-023-00365-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 07/18/2023] [Indexed: 08/03/2023]
Abstract
BACKGROUND Lower respiratory infections are a leading cause of severe morbidity and mortality among older adults. Despite ubiquitous exposure to common respiratory pathogens throughout life and near universal seropositivity, antibodies fail to effectively protect the elderly. Therefore, we hypothesized that severe respiratory illness in the elderly is due to deficient CD8+ T cell responses. RESULTS Here, we establish an aged mouse model of human metapneumovirus infection (HMPV) wherein aged C57BL/6 mice exhibit worsened weight loss, clinical disease, lung pathology and delayed viral clearance compared to young adult mice. Aged mice generate fewer lung-infiltrating HMPV epitope-specific CD8+ T cells. Those that do expand demonstrate higher expression of PD-1 and other inhibitory receptors and are functionally impaired. Transplant of aged T cells into young mice and vice versa, as well as adoptive transfer of young versus aged CD8+ T cells into Rag1-/- recipients, recapitulates the HMPV aged phenotype, suggesting a cell-intrinsic age-associated defect. HMPV-specific aged CD8+ T cells exhibit a terminally exhausted TCF1/7- TOX+ EOMES+ phenotype. We confirmed similar terminal exhaustion of aged CD8+ T cells during influenza viral infection. CONCLUSIONS This study identifies terminal CD8+ T cell exhaustion as a mechanism of severe disease from respiratory viral infections in the elderly.
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Affiliation(s)
- Olivia B Parks
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Taylor Eddens
- Department of Pediatrics, Division of Allergy/Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Jorna Sojati
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Jie Lan
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Yu Zhang
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Tim D Oury
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Manda Ramsey
- Department of Pediatrics, Division of Blood and Marrow Transplant and Cellular Therapies, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - John J Erickson
- Department of Pediatrics, Division of Neonatology and Pulmonary Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati School of Medicine, Cincinnati, OH, USA
| | - Craig A Byersdorfer
- Department of Pediatrics, Division of Blood and Marrow Transplant and Cellular Therapies, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - John V Williams
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
- Institute for Infection, Inflammation, and Immunity in Children (i4Kids), Pittsburgh, PA, USA.
- University of Pittsburgh, Rangos Research Building, 4401 Penn Avenue, Pittsburgh, PA, 15224, USA.
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3
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Parks OB, Eddens T, Zhang Y, Oury TD, McElroy A, Williams JV. Human Metapneumovirus Reinfection in Aged Mice Recapitulates Increased Disease Severity in Elderly Humans Infected with Human Metapneumovirus. Immunohorizons 2023; 7:398-411. [PMID: 37261717 PMCID: PMC10321313 DOI: 10.4049/immunohorizons.2300026] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 06/02/2023] Open
Abstract
Human metapneumovirus (HMPV) is a leading cause of respiratory infection in adults >65 y. Nearly all children worldwide are seropositive for HMPV by age 5 y, but reinfections occur throughout life, and there is no licensed vaccine. Recurrent HMPV infection is mild and self-resolving in immunocompetent individuals. However, elderly individuals develop severe respiratory disease on HMPV reinfection that leads to a high risk for morbidity and mortality. In this study, we developed a mouse model to mirror HMPV reinfection in elderly humans. C57BL/6J mice were infected with HMPV at 6-7 wk old, aged in-house, and rechallenged with high-dose virus at 70 wk. Aged rechallenged mice had profound weight loss similar to primary infected mice, increased lung histopathology, and accumulated cytotoxic CD8+CD44+CD62L-CD69+CD103+ memory cells despite having undetectable lung virus titer. When aged mice 14 mo postinfection (p.i.) or young mice 5 wk p.i. were restimulated with HMPV cognate Ag to mimic epitope vaccination, aged mice had an impaired CD8+ memory response. Convalescent serum transfer from young naive or 5 wk p.i. mice into aged mice on day of infection did not protect. Aged mice vaccinated with UV-inactivated HMPV also exhibited diminished protection and poor CD8+ memory response compared with young mice. These results suggest aged individuals with HMPV reinfection have a dysregulated CD8+ memory T cell response that fails to protect and exacerbates disease. Moreover, aged mice exhibited a poor memory response to either epitope peptide or UV-inactivated vaccination, suggesting that aged CD8+ T cell dysfunction presents a barrier to effective vaccination strategies.
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Affiliation(s)
- Olivia B. Parks
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Taylor Eddens
- Department of Pediatrics, Division of Allergy/Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Yu Zhang
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Tim D. Oury
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Anita McElroy
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Institute for Infection, Inflammation, and Immunity in Children (i4Kids), Pittsburgh, PA
- Center for Vaccine Research, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - John V. Williams
- Department of Pediatrics, Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA
- Institute for Infection, Inflammation, and Immunity in Children (i4Kids), Pittsburgh, PA
- Center for Vaccine Research, University of Pittsburgh School of Medicine, Pittsburgh, PA
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4
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López D, Barriga A, Lorente E, Mir C. Immunoproteomic Lessons for Human Respiratory Syncytial Virus Vaccine Design. J Clin Med 2019; 8:E486. [PMID: 30974886 PMCID: PMC6518116 DOI: 10.3390/jcm8040486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/01/2019] [Accepted: 04/09/2019] [Indexed: 11/25/2022] Open
Abstract
Accurate antiviral humoral and cellular immune responses require prior recognition of antigenic peptides presented by human leukocyte antigen (HLA) class I and II molecules on the surface of antigen-presenting cells. Both the helper and the cytotoxic immune responses are critical for the control and the clearance of human respiratory syncytial virus (HRSV) infection, which is a significant cause of morbidity and mortality in infected pediatric, immunocompromised and elderly populations. In this article we review the immunoproteomics studies which have defined the general antigen processing and presentation rules that determine both the immunoprevalence and the immunodominance of the cellular immune response to HRSV. Mass spectrometry and functional analyses have shown that the HLA class I and II cellular immune responses against HRSV are mainly focused on three viral proteins: fusion, matrix, and nucleoprotein. Thus, these studies have important implications for vaccine development against this virus, since a vaccine construct including these three relevant HRSV proteins could efficiently stimulate the major components of the adaptive immune system: humoral, helper, and cytotoxic effector immune responses.
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Affiliation(s)
- Daniel López
- Centro Nacional de Microbiología, Instituto de Salud Carlos III, 28220 Majadahonda (Madrid), Spain.
| | - Alejandro Barriga
- Centro Nacional de Microbiología, Instituto de Salud Carlos III, 28220 Majadahonda (Madrid), Spain.
| | - Elena Lorente
- Centro Nacional de Microbiología, Instituto de Salud Carlos III, 28220 Majadahonda (Madrid), Spain.
| | - Carmen Mir
- Centro Nacional de Microbiología, Instituto de Salud Carlos III, 28220 Majadahonda (Madrid), Spain.
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5
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Song J, Wang H, Ng TI, Cui A, Zhu S, Huang Y, Sun L, Yang Z, Yu D, Yu P, Zhang H, Zhang Y, Xu W. Sequence Analysis of the Fusion Protein Gene of Human Respiratory Syncytial Virus Circulating in China from 2003 to 2014. Sci Rep 2018; 8:17618. [PMID: 30514963 PMCID: PMC6279739 DOI: 10.1038/s41598-018-35894-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 11/09/2018] [Indexed: 11/09/2022] Open
Abstract
The human respiratory syncytial virus (HRSV) fusion (F) protein is important for HRSV infection, but few studies have examined the genetic diversity of the F gene from Chinese samples. In this study, a total of 330 HRSV F sequences collected from different regions of China between 2003 and 2014 were analyzed to understand their genetic characteristics. In addition, these sequences were compared with 1150 HRSV F sequences in Genbank from 18 other countries. In phylogenetic analysis, Chinese HRSV F sequences sorted into a number of clusters containing sequences from China as well as other countries. F sequences from different genotypes (as determined based on the G gene sequences) within a HRSV subgroup could be found in the same clusters in phylogenetic trees generated based on F gene sequences. Amino acid analysis showed that HRSV F sequences from China and other countries were highly conserved. Of interest, F protein sequences from all Chinese samples were completely conserved at the palivizumab binding site, thus predicting the susceptibility of these strains to this neutralizing antibody. In conclusion, HRSV F sequences from China between 2003 and 2014, similar to those from other countries, were highly conserved.
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Affiliation(s)
- Jinhua Song
- WHO WPRO Regional Reference Measles/Rubella Laboratory and Key Laboratory of Medical Virology, National Health Commission of the People's Republic of China, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Huiling Wang
- WHO WPRO Regional Reference Measles/Rubella Laboratory and Key Laboratory of Medical Virology, National Health Commission of the People's Republic of China, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, People's Republic of China
| | | | - Aili Cui
- WHO WPRO Regional Reference Measles/Rubella Laboratory and Key Laboratory of Medical Virology, National Health Commission of the People's Republic of China, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Shuangli Zhu
- WHO WPRO Regional Reference Measles/Rubella Laboratory and Key Laboratory of Medical Virology, National Health Commission of the People's Republic of China, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Yanzhi Huang
- Jilin Children's Medical Center, Children's Hospital of Changchun, Changchun, People's Republic of China
| | - Liwei Sun
- Jilin Children's Medical Center, Children's Hospital of Changchun, Changchun, People's Republic of China
| | - Zifeng Yang
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Deshan Yu
- Gansu Provincial Centers for Disease Control and Prevention, Lanzhou, People's Republic of China
| | - Pengbo Yu
- Shaanxi Provincial Centers for Disease Control and Prevention, Xian, People's Republic of China
| | - Hong Zhang
- Hunan Provincial Centers for Disease Control and Prevention, Changsha, People's Republic of China
| | - Yan Zhang
- WHO WPRO Regional Reference Measles/Rubella Laboratory and Key Laboratory of Medical Virology, National Health Commission of the People's Republic of China, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, People's Republic of China.
| | - Wenbo Xu
- WHO WPRO Regional Reference Measles/Rubella Laboratory and Key Laboratory of Medical Virology, National Health Commission of the People's Republic of China, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, People's Republic of China.
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6
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Chen X, Xu B, Guo J, Li C, An S, Zhou Y, Chen A, Deng L, Fu Z, Zhu Y, Liu C, Xu L, Wang W, Shen K, Xie Z. Genetic variations in the fusion protein of respiratory syncytial virus isolated from children hospitalized with community-acquired pneumonia in China. Sci Rep 2018. [PMID: 29540836 PMCID: PMC5852162 DOI: 10.1038/s41598-018-22826-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
To identify the variations in fusion (F) protein gene of RSV in China, a molecular epidemiological study was conducted. A total of 553 RSV positive specimens were collected from 2338 pediatric patients hospitalized with community-acquired pneumonia during a multi-center study conducted during 2014–2016. A total of 252 samples (183 RSV A, 69 RSV B) were selected for F gene sequencing, and analyzed together with 142 F gene sequences downloaded from GenBank. The result showed that all the Chinese RSV A and RSV B strains could be divided respectively into three branches. Compared with RSV A/B prototype sequences respectively, there were significant amino acid (AA) mutations at multiple antigenic sites. For RSV A, changes were found at AA residues 122, 124, 125, 276 and 384, and for RSV B at AA residues 45, 116, 125, 172, 173 and 202. Variations in human histocompatibility leukocyte antigen-restricted CTL epitopes were also observed. In total, 56 amino acid differences for the complete F protein were found between the RSV A and B groups in China, while several mutations were only found in the RSV B strains during 2015–2016. The RSV F gene is relatively conserved in China, however, limited mutations are still occurring with time.
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Affiliation(s)
- Xiangpeng Chen
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China.,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Baoping Xu
- Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Jiayun Guo
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China.,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Changchong Li
- The 2nd Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Shuhua An
- Children's Hospital of Hebei Province, Shijiazhuang, China
| | - Yunlian Zhou
- The Children's Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Aihuan Chen
- The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Li Deng
- Guangzhou Women and Children's Medical Center, Guangzhou, China
| | - Zhou Fu
- Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Yun Zhu
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China.,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Chunyan Liu
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China.,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Lili Xu
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China.,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Wei Wang
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China.,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China
| | - Kunling Shen
- Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China.
| | - Zhengde Xie
- Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases, Beijing Pediatric Research Institute, Beijing, 100045, China. .,Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 10045, China.
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7
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Fu YH, Liu YR, Zheng YP, Jiang N, Yue-Ying-Jiao, Li W, Peng XL, He JS. An RNA polymerase I-driven human respiratory syncytial virus minigenome as a tool for quantifying virus titers and screening antiviral drug. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2016.06.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Erickson JJ, Rogers MC, Tollefson SJ, Boyd KL, Williams JV. Multiple Inhibitory Pathways Contribute to Lung CD8+ T Cell Impairment and Protect against Immunopathology during Acute Viral Respiratory Infection. THE JOURNAL OF IMMUNOLOGY 2016; 197:233-43. [PMID: 27259857 DOI: 10.4049/jimmunol.1502115] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 05/03/2016] [Indexed: 02/06/2023]
Abstract
Viruses are frequent causes of lower respiratory infection (LRI). Programmed cell death-1 (PD-1) signaling contributes to pulmonary CD8(+) T cell (TCD8) functional impairment during acute viral LRI, but the role of TCD8 impairment in viral clearance and immunopathology is unclear. We now find that human metapneumovirus infection induces virus-specific lung TCD8 that fail to produce effector cytokines or degranulate late postinfection, with minimally increased function even in the absence of PD-1 signaling. Impaired lung TCD8 upregulated multiple inhibitory receptors, including PD-1, lymphocyte activation gene 3 (LAG-3), T cell Ig mucin 3, and 2B4. Moreover, coexpression of these receptors continued to increase even after viral clearance, with most virus-specific lung TCD8 expressing three or more inhibitory receptors on day 14 postinfection. Viral infection also increased expression of inhibitory ligands by both airway epithelial cells and APCs, further establishing an inhibitory environment. In vitro Ab blockade revealed that multiple inhibitory receptors contribute to TCD8 impairment induced by either human metapneumovirus or influenza virus infection. In vivo blockade of T cell Ig mucin 3 signaling failed to enhance TCD8 function or reduce viral titers. However, blockade of LAG-3 in PD-1-deficient mice restored TCD8 effector functions but increased lung pathology, indicating that LAG-3 mediates lung TCD8 impairment in vivo and contributes to protection from immunopathology during viral clearance. These results demonstrate that an orchestrated network of pathways modifies lung TCD8 functionality during viral LRI, with PD-1 and LAG-3 serving prominent roles. Lung TCD8 impairment may prevent immunopathology but also contributes to recurrent lung infections.
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Affiliation(s)
- John J Erickson
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Meredith C Rogers
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232; Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, PA 15224; and
| | - Sharon J Tollefson
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Kelli L Boyd
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - John V Williams
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, PA 15224; and Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN 37232
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9
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Espinoza JA, Bohmwald K, Céspedes PF, Riedel CA, Bueno SM, Kalergis AM. Modulation of host adaptive immunity by hRSV proteins. Virulence 2015; 5:740-51. [PMID: 25513775 PMCID: PMC4189880 DOI: 10.4161/viru.32225] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Globally, the human respiratory syncytial virus (hRSV) is the major cause of lower respiratory tract infections (LRTIs) in infants and children younger than 2 years old. Furthermore, the number of hospitalizations due to LRTIs has shown a sustained increase every year due to the lack of effective vaccines against hRSV. Thus, this virus remains as a major public health and economic burden worldwide. The lung pathology developed in hRSV-infected humans is characterized by an exacerbated inflammatory and Th2 immune response. In order to rationally design new vaccines and therapies against this virus, several studies have focused in elucidating the interactions between hRSV virulence factors and the host immune system. Here, we discuss the main features of hRSV biology, the processes involved in virus recognition by the immune system and the most relevant mechanisms used by this pathogen to avoid the antiviral host response.
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Affiliation(s)
- Janyra A Espinoza
- a Millenium Institute on Immunology and Immunotherapy; Departamento de Genética Molecular y Microbiología; Facultad de Ciencias Biológicas; Pontificia Universidad Católica de Chile; Santiago, Chile
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10
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Abstract
ABSTRACT Respiratory syncytial virus (RSV) is the leading cause of lower respiratory tract infection and hospitalization among infants. Despite the significant healthcare burden, there is no licensed RSV vaccine currently available. This problem is further exacerbated as a natural RSV infection fails to elicit the development of long-lived immunity. It is well established that RSV-specific antibodies play a critical role in mediating protection from severe disease. The CD8 T-cell response is critical for mediating virus clearance following an acute RSV infection. However, the relative contribution of memory CD8 T cells in providing protection against secondary RSV infections remains unclear. In addition, data from animal models indicate that memory CD8 T-cell responses can be pathogenic under certain conditions. Herein, we provide an overview of the CD8 T-cell response elicited by RSV infection and how our current knowledge may impact future studies and vaccine development.
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Affiliation(s)
- Cory J Knudson
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA 52242, USA
| | - Steven M Varga
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA 52242, USA
- Department of Microbiology, University of Iowa, Iowa City, IA 52242, USA
- Department of Pathology, University of Iowa, Iowa City, IA 52242, USA
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11
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Kim YI, DeVincenzo JP, Jones BG, Rudraraju R, Harrison L, Meyers R, Cehelsky J, Alvarez R, Hurwitz JL. Respiratory syncytial virus human experimental infection model: provenance, production, and sequence of low-passaged memphis-37 challenge virus. PLoS One 2014; 9:e113100. [PMID: 25415360 PMCID: PMC4240712 DOI: 10.1371/journal.pone.0113100] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Accepted: 10/19/2014] [Indexed: 01/11/2023] Open
Abstract
Respiratory syncytial virus (RSV) is the leading cause of lower respiratory tract infections in children and is responsible for as many as 199,000 childhood deaths annually worldwide. To support the development of viral therapeutics and vaccines for RSV, a human adult experimental infection model has been established. In this report, we describe the provenance and sequence of RSV Memphis-37, the low-passage clinical isolate used for the model's reproducible, safe, experimental infections of healthy, adult volunteers. The predicted amino acid sequences for major proteins of Memphis-37 are compared to nine other RSV A and B amino acid sequences to examine sites of vaccine, therapeutic, and pathophysiologic interest. Human T- cell epitope sequences previously defined by in vitro studies were observed to be closely matched between Memphis-37 and the laboratory strain RSV A2. Memphis-37 sequences provide baseline data with which to assess: (i) virus heterogeneity that may be evident following virus infection/transmission, (ii) the efficacy of candidate RSV vaccines and therapeutics in the experimental infection model, and (iii) the potential emergence of escape mutants as a consequence of experimental drug treatments. Memphis-37 is a valuable tool for pre-clinical research, and to expedite the clinical development of vaccines, therapeutic immunomodulatory agents, and other antiviral drug strategies for the protection of vulnerable populations against RSV disease.
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Affiliation(s)
- Young-In Kim
- Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
- Children's Foundation Research Institute of Le Bonheur Children's Hospital, Memphis, Tennessee, United States of America
| | - John P. DeVincenzo
- Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
- Children's Foundation Research Institute of Le Bonheur Children's Hospital, Memphis, Tennessee, United States of America
| | - Bart G. Jones
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, United States of America
| | - Rajeev Rudraraju
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, United States of America
| | - Lisa Harrison
- Children's Foundation Research Institute of Le Bonheur Children's Hospital, Memphis, Tennessee, United States of America
| | - Rachel Meyers
- Alnylam Pharmaceuticals, Cambridge, Massachusetts, United States of America
| | - Jeff Cehelsky
- Alnylam Pharmaceuticals, Cambridge, Massachusetts, United States of America
| | - Rene Alvarez
- Alnylam Pharmaceuticals, Cambridge, Massachusetts, United States of America
| | - Julia L. Hurwitz
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
- Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, United States of America
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12
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Erickson JJ, Rogers MC, Hastings AK, Tollefson SJ, Williams JV. Programmed death-1 impairs secondary effector lung CD8⁺ T cells during respiratory virus reinfection. THE JOURNAL OF IMMUNOLOGY 2014; 193:5108-17. [PMID: 25339663 DOI: 10.4049/jimmunol.1302208] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Reinfections with respiratory viruses are common and cause significant clinical illness, yet precise mechanisms governing this susceptibility are ill defined. Lung Ag-specific CD8(+) T cells (T(CD8)) are impaired during acute viral lower respiratory infection by the inhibitory receptor programmed death-1 (PD-1). To determine whether PD-1 contributes to recurrent infection, we first established a model of reinfection by challenging B cell-deficient mice with human metapneumovirus (HMPV) several weeks after primary infection, and found that HMPV replicated to high titers in the lungs. A robust secondary effector lung TCD8 response was generated during reinfection, but these cells were more impaired and more highly expressed the inhibitory receptors PD-1, LAG-3, and 2B4 than primary T(CD8). In vitro blockade demonstrated that PD-1 was the dominant inhibitory receptor early after reinfection. In vivo therapeutic PD-1 blockade during HMPV reinfection restored lung T(CD8) effector functions (i.e., degranulation and cytokine production) and enhanced viral clearance. PD-1 also limited the protective efficacy of HMPV epitope-specific peptide vaccination and impaired lung T(CD8) during heterotypic influenza virus challenge infection. Our results indicate that PD-1 signaling may contribute to respiratory virus reinfection and evasion of vaccine-elicited immune responses. These results have important implications for the design of effective vaccines against respiratory viruses.
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Affiliation(s)
- John J Erickson
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232; and
| | - Meredith C Rogers
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232; and
| | - Andrew K Hastings
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232; and
| | - Sharon J Tollefson
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - John V Williams
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232; and Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN 37232
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13
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The genetic variability of glycoproteins among respiratory syncytial virus subtype A in China between 2009 and 2013. INFECTION GENETICS AND EVOLUTION 2014; 27:339-47. [PMID: 25109878 DOI: 10.1016/j.meegid.2014.07.030] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 07/28/2014] [Accepted: 07/29/2014] [Indexed: 11/21/2022]
Abstract
Human respiratory syncytial virus (RSV) is the leading cause of acute lower respiratory tract infections in infants and children under 5years of age. The novel genotype ON1 has a 72-nucleotide duplication, which is the largest duplicated genome portion of RSV. Whether the ON1 genotype will follow the pattern of the BA genotype, which has a 60-nucleotide duplication, and become the predominant RSV-A strain is a global concern. To obtain information regarding the prevalence of the ON1 genotype in Chongqing in Southwestern China, we examined the circulation pattern of RSV-A identified over four consecutive years (June 2009 to August 2013). In this study, 312 (12%) RSV-A strains were isolated from 2601 nasopharyngeal aspirates, and partial G gene was sequenced successfully in 250 isolates. Of the sequenced Chongqing RSV-A isolates, 237 (94.8%) strains were the NA1 genotype, 4 (1.6%) strains were the NA3 genotype, 4 (1.6%) strains were the NA4 genotype, 1 (0.4%) strain was the GA1 genotype, and 4 (1.6%) strains were identified as the ON1 genotype. Analysis of the distribution, phylogeny, and evolution of the ON1 strains that were collected globally until December 2013 revealed that the ON1 genotype has rapidly disseminated across the world under positive selection pressures. Future studies will determine whether this new genotype will continue to spread and become the dominant strain of RSV-A worldwide. These findings may contribute to the understanding of RSV evolution and to the potential development of a vaccine against RSV.
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14
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Detection of respiratory syncytial virus fusion protein variants between 2009 and 2012 in China. Arch Virol 2013; 159:1089-98. [PMID: 24297488 DOI: 10.1007/s00705-013-1870-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 09/23/2013] [Indexed: 10/26/2022]
Abstract
Respiratory syncytial virus (RSV) causes respiratory tract infection, particularly acute lower respiratory tract infection (ALRTI), in early childhood. The RSV fusion protein (F protein) is an important surface protein, and it is the target of both cytotoxic T lymphocytes (CTL) and neutralizing antibodies; thus, it may be useful as a candidate for vaccine research. This study investigated the genetic diversity of the RSV F protein. To this end, a total of 1800 nasopharyngeal aspirates from hospitalized children with ALRTI were collected for virus isolation between June 2009 and March 2012. There were 333 RSV-positive cases (277 cases of RSV A, 55 of RSV B, and 1 with both RSV A and RSV B), accounting for 18.5 % of the total cases. Next, 130 clinical strains (107 of RSV A, 23 of RSV B) were selected for F gene sequencing. Phylogenetic analysis revealed that the F gene sequence is highly conserved, with significant amino acid changes at residues 16, 25, 45, 102, 122, 124, 209, and 447. Mutations in human histocompatibility leukocyte antigen (HLA)-restricted CTL epitopes were also observed. Variations in RSV A F protein at the palivizumab binding site 276 (N→S) increased between 2009 and 2012 and became predominant. Western blot analysis and microneutralization data showed a substitution at residue 276 (N→S) in RSV A that did not cause resistance to palivizumab. In conclusion, the RSV F gene is geographically and temporally conserved, but limited genetic variations were still observed. These data could be helpful for the development of vaccines against RSV infection.
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15
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Creech CB, Dekker CL, Ho D, Phillips S, Mackey S, Murray-Krezan C, Grazia Pau M, Hendriks J, Brown V, Dally LG, Versteege I, Edwards KM. Randomized, placebo-controlled trial to assess the safety and immunogenicity of an adenovirus type 35-based circumsporozoite malaria vaccine in healthy adults. Hum Vaccin Immunother 2013; 9:2548-57. [PMID: 23955431 DOI: 10.4161/hv.26038] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Malaria results in over 650,000 deaths each year; thus, there is an urgent need for an effective vaccine. Pre-clinical studies and recently reported human trials suggest that pre-erythrocytic stage vaccines can provide protection against infection. A Phase 1, randomized, placebo-controlled, dose-escalation study was conducted with a vaccine composed of a replication-deficient adenovirus-35 backbone with P. falciparum circumsporozoite (CS) surface antigen (Ad35.CS.01). Healthy adult subjects received three doses of 10 (8), 10 (9), 10 (10), or 10 (11) vp/mL Ad35.CS.01 vaccine or saline placebo intramuscularly at 0, 1, and 6-mo intervals. Adverse events were assessed and anti-CS antibody responses were determined by ELISA. Seventy-two individuals were enrolled, with age, gender, and ethnicity similar across each study arm. While the vaccine was generally well tolerated, adverse events were more frequent in the highest dose groups (10 (10) and 10 (11) vp/mL). More robust humoral responses were also noted at the highest doses, with 73% developing a positive ELISA response after the three dose series of 10 (11) vp/mL. The Ad35.CS.01 vaccine was most immunogenic at the highest dosages (10 (10) and 10 (11) vp/mL). Reactogenicity findings were more common after the 10 (11) vp/mL dose, although most were mild or moderate in nature and resolved without therapy.
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Affiliation(s)
- C Buddy Creech
- Vanderbilt Vaccine Research Program; Department of Pediatrics; Vanderbilt University School of Medicine; Nashville, TN USA
| | - Cornelia L Dekker
- Stanford-LPCH Vaccine Program, Department of Pediatrics-Infectious Diseases; Stanford University School of Medicine; Stanford, CA USA
| | - Dora Ho
- Stanford-LPCH Vaccine Program, Department of Pediatrics-Infectious Diseases; Stanford University School of Medicine; Stanford, CA USA
| | - Shanda Phillips
- Vanderbilt Vaccine Research Program; Department of Pediatrics; Vanderbilt University School of Medicine; Nashville, TN USA
| | - Sally Mackey
- Stanford-LPCH Vaccine Program, Department of Pediatrics-Infectious Diseases; Stanford University School of Medicine; Stanford, CA USA
| | - Cristina Murray-Krezan
- Division of Epidemiology, Biostatistics and Preventive Medicine; Department of Internal Medicine; University of New Mexico Health Sciences Center; Albuquerque, NM USA
| | | | | | | | | | | | - Kathryn M Edwards
- Vanderbilt Vaccine Research Program; Department of Pediatrics; Vanderbilt University School of Medicine; Nashville, TN USA
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16
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Stone JW, Thornburg NJ, Blum DL, Kuhn SJ, Wright DW, Crowe JE. Gold nanorod vaccine for respiratory syncytial virus. NANOTECHNOLOGY 2013; 24:295102. [PMID: 23799651 PMCID: PMC3754908 DOI: 10.1088/0957-4484/24/29/295102] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Respiratory syncytial virus (RSV) is a major cause of pneumonia and wheezing in infants and the elderly, but to date there is no licensed vaccine. We developed a gold nanorod construct that displayed the major protective antigen of the virus, the fusion protein (F). Nanorods conjugated to RSV F were formulated as a candidate vaccine preparation by covalent attachment of viral protein using a layer-by-layer approach. In vitro studies using ELISA, electron microscopy and circular dichroism revealed that conformation-dependent epitopes were maintained during conjugation, and transmission electron microscopy studies showed that a dispersed population of particles could be achieved. Human dendritic cells treated with the vaccine induced immune responses in primary human T cells. These results suggest that this vaccine approach may be a potent method for immunizing against viruses such as RSV with surface glycoproteins that are targets for the human immune response.
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Affiliation(s)
- John W. Stone
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232
| | - Natalie J. Thornburg
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232
| | - David L. Blum
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232
| | - Sam J. Kuhn
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232
| | - David W. Wright
- Department of Chemistry, Vanderbilt University, Nashville, TN, 37235
| | - James E. Crowe
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, 37232
- Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, TN, 37232
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17
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Molecular epidemiology and phylodynamics of the human respiratory syncytial virus fusion protein in northern Taiwan. PLoS One 2013; 8:e64012. [PMID: 23734183 PMCID: PMC3667090 DOI: 10.1371/journal.pone.0064012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Accepted: 04/08/2013] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND AND AIMS The glycoprotein (G protein) and fusion protein (F protein) of respiratory syncytial virus (RSV) both show genetic variability, but few studies have examined the F protein gene. This study aimed to characterize the molecular epidemiology and phylodynamics of the F protein gene in clinical RSV strains isolated in northern Taiwan from 2000-2011. METHODS RSV isolates from children presenting with acute respiratory symptoms between July 2000 and June 2011 were typed based on F protein gene sequences. Phylogeny construction and evaluation were performed using the neighbor-joining (NJ) and maximum likelihood (ML) methods. Phylodynamic patterns in RSV F protein genes were analyzed using the Bayesian Markov Chain Monte Carlo framework. Selection pressure on the F protein gene was detected using the Datamonkey website interface. RESULTS From a total of 325 clinical RSV strains studied, phylogenetic analysis showed that 83 subgroup A strains (RSV-A) could be further divided into three clusters, whereas 58 subgroup B strains (RSV-B) had no significant clustering. Three amino acids were observed to differ between RSV-A and -B (positions 111, 113, and 114) in CTL HLA-B*57- and HLA-A*01-restricted epitopes. One positive selection site was observed in RSV-B, while none was observed in RSV-A. The evolution rate of the virus had very little change before 2000, then slowed down between 2000 and 2005, and evolved significantly faster after 2005. The dominant subtypes of RSV-A in each epidemic were replaced by different subtypes in the subsequent epidemic. CONCLUSIONS Before 2004, RSV-A infections were involved in several small epidemics and only very limited numbers of strains evolved and re-emerged in subsequent years. After 2005, the circulating RSV-A strains were different from those of the previous years and continued evolving through 2010. Phylodynamic pattern showed the evolutionary divergence of RSV increased significantly in the recent 5 years in northern Taiwan.
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18
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Adults 65 years old and older have reduced numbers of functional memory T cells to respiratory syncytial virus fusion protein. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2012; 20:239-47. [PMID: 23239796 DOI: 10.1128/cvi.00580-12] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Respiratory syncytial virus (RSV) infects elderly (≥65 years) adults, causing medically attended illness and hospitalizations. While RSV neutralizing antibody levels correlate inversely with RSV-associated hospitalization in the elderly, the role of RSV-specific T cells in preventing disease in the elderly remains unclear. We examined RSV-specific humoral, mucosal, and cellular immune profiles in healthy elderly (65 to 85 years) and young (20 to 30 years) adults. RSV neutralization antibody titers in the elderly (10.5 ± 2.2 log(2)) and young (10.5 ± 2.1 log(2)) were similar. In contrast, levels of RSV F protein-specific gamma interferon (IFN-γ)-producing T cells were lower in elderly (180 ± 80 spot-forming cells [SFC]/10(6) peripheral blood mononuclear cells [PBMC]) than in young adults (1,250 ± 420 SFC/10(6) PBMC). Higher levels of interleukin-13 (IL-13; 3,000 ± 1,000 pg/ml) in cultured PBMC supernatants and lower frequency of RSV F-specific CD107a(+) CD8(+) T cells (3.0% ± 1.6% versus 5.0% ± 1.6%) were measured in PBMC from elderly than young adults. These results suggest that deficient RSV F-specific T cell responses contribute to susceptibility to severe RSV disease in elderly adults.
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19
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Erickson JJ, Gilchuk P, Hastings AK, Tollefson SJ, Johnson M, Downing MB, Boyd KL, Johnson JE, Kim AS, Joyce S, Williams JV. Viral acute lower respiratory infections impair CD8+ T cells through PD-1. J Clin Invest 2012; 122:2967-82. [PMID: 22797302 DOI: 10.1172/jci62860] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 06/07/2012] [Indexed: 12/25/2022] Open
Abstract
Viruses are leading causes of severe acute lower respiratory infections (LRIs). These infections evoke incomplete immunity, as individuals can be repeatedly reinfected throughout life. We report that acute viral LRI causes rapid pulmonary CD8+ cytotoxic T lymphocyte (TCD8) functional impairment via programmed death-1/programmed death ligand-1 (PD-1/PD-L1) signaling, a pathway previously associated with prolonged antigenic stimulation during chronic infections and cancer. PD-1-mediated TCD8 impairment occurred acutely in mice following infection with human metapneumovirus or influenza virus. Viral antigen was sufficient for PD-1 upregulation, but induction of PD-L1 was required for impairment. During secondary viral infection or epitope-only challenge, memory TCD8 rapidly reexpressed PD-1 and exhibited severe functional impairment. Inhibition of PD-1 signaling using monoclonal antibody blockade prevented TCD8 impairment, reduced viral titers during primary infection, and enhanced protection of immunized mice against challenge infection. Additionally, PD-1 and PD-L1 were upregulated in the lungs of patients with 2009 H1N1 influenza virus, respiratory syncytial virus, or parainfluenza virus infection. These results indicate that PD-1 mediates TCD8 functional impairment during acute viral infection and may contribute to recurrent viral LRIs. Therefore, the PD-1/PD-L1 pathway may represent a therapeutic target in the treatment of respiratory viruses.
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Affiliation(s)
- John J Erickson
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, TN, USA
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20
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Shao HY, Lin YW, Yu SL, Lin HY, Chitra E, Chang YC, Sia C, Chong P, Hsu MT, Wei OL, Chow YH. Immunoprotectivity of HLA-A2 CTL peptides derived from respiratory syncytial virus fusion protein in HLA-A2 transgenic mouse. PLoS One 2011; 6:e25500. [PMID: 21980478 PMCID: PMC3183052 DOI: 10.1371/journal.pone.0025500] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 09/06/2011] [Indexed: 11/18/2022] Open
Abstract
Identification of HLA-restricted CD8+ T cell epitopes is important to study RSV-induced immunity and illness. We algorithmically analyzed the sequence of the fusion protein (F) of respiratory syncytial virus (RSV) and generated synthetic peptides that can potentially bind to HLA-A*0201. Four out of the twenty-five 9-mer peptides tested: peptides 3 (F33–41), 13 (F214–222), 14 (F273–281), and 23 (F559–567), were found to bind to HLA-A*0201 with moderate to high affinity and were capable of inducing IFN-γ and IL-2 secretion in lymphocytes from HLA-A*0201 transgenic (HLA-Tg) mice pre-immunized with RSV or recombinant adenovirus expressing RSV F. HLA-Tg mice were immunized with these four peptides and were found to induce both Th1 and CD8+ T cell responses in in vitro secondary recall. Effector responses induced by these peptides were observed to confer differential protection against live RSV challenge. These peptides also caused better recovery of body weight loss induced by RSV. A significant reduction of lung viral load was observed in mice immunized with peptide 23, which appeared to enhance the levels of inflammatory chemokines (CCL17, CCL22, and IL-18) but did not increase eosinophil infiltration in the lungs. Whereas, significant reduction of infiltrated eosinophils induced by RSV infection was found in mice pre-immunized with peptide 13. Our results suggest that HLA-A2-restricted epitopes of RSV F protein could be useful for the development of epitope-based RSV vaccine.
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Affiliation(s)
- Hsiao-Yun Shao
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Yi-Wen Lin
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
- Graduate Program of Biotechnology in Medicine, Institute of Molecular Medicine, National Tsing Hua University, Hsinchu, Taiwan
| | - Shu-Ling Yu
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Hsiang-Yin Lin
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Ebenezer Chitra
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Yung-Chen Chang
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Charles Sia
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Pele Chong
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Ming-Tao Hsu
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Olivia L. Wei
- The Graduate Division of Biological and Biomedical Sciences (GDBBS), Emory University, Atlanta, Georgia, United States of America
| | - Yen-Hung Chow
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
- * E-mail:
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21
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Rock MT, McKinney BA, Yoder SM, Prudom CE, Wright DW, Crowe JE. Identification of potential human respiratory syncytial virus and metapneumovirus T cell epitopes using computational prediction and MHC binding assays. J Immunol Methods 2011; 374:13-7. [PMID: 21854782 DOI: 10.1016/j.jim.2011.08.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 08/03/2011] [Accepted: 08/03/2011] [Indexed: 11/25/2022]
Abstract
Human respiratory syncytial virus (RSV) and human metapneumovirus (MPV) are two of the most common causes of serious viral lower respiratory tract illness in humans. CD8+ T cells have been shown to be important in animal models and human clinical studies for the clearance of viral infection, and they may contribute in part to protection against severe disease during reinfections. Precise enumeration and accurate phenotyping of RSV- or MPV-specific CD8+ T cells in humans is currently limited by the relatively small number of T cell epitopes that have been mapped with accompanying identification of MHC restriction patterns. We sought to expand the number of potential RSV and MPV epitopes for use in clinical and translational studies by identifying an expanded set of MHC-binding peptides based on RSV and MPV wild-type virus strain protein sequences. We interrogated the full protein sequences of all 9 or 11 proteins of MPV or RSV respectively using four established epitope prediction algorithms for human HLA A*0101, A*0201, or B*0702 binding and attempted to synthesize the top-scoring 150-152 peptides for each of the two viruses. Synthesis resulted in 442 synthesized and soluble peptides of the 452 predicted epitopes for MPV or RSV. We then determined the binding of the synthetic peptides to recombinant human HLA A*0101, A*0201 or B*0702 molecules with the predicted restriction using a commercially available plate-based assay, iTopia. A total of 230 of the 442 peptides tested exhibited binding to the appropriate MHC molecule. The binding results suggested that existing algorithms for prediction of MHC A*0201 binding are particularly robust. The binding results also provided a large benchmarking data collection for comparison of new prediction algorithms.
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Affiliation(s)
- Michael T Rock
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN, USA
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22
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Melendi GA, Bridget D, Monsalvo AC, Laham FF, Acosta P, Delgado MF, Polack FP, Irusta PM. Conserved cysteine residues within the attachment G glycoprotein of respiratory syncytial virus play a critical role in the enhancement of cytotoxic T-lymphocyte responses. Virus Genes 2010; 42:46-54. [PMID: 21053062 PMCID: PMC5454483 DOI: 10.1007/s11262-010-0545-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Accepted: 10/18/2010] [Indexed: 01/21/2023]
Abstract
The cytotoxic T-lymphocyte (CTL) response plays an important role in the control of respiratory syncytial virus (RSV) replication and the establishment of a Th1-CD4+ T cell response against the virus. Despite lacking Major Histocompatibility Complex I (MHC I)-restricted epitopes, the attachment G glycoprotein of RSV enhances CTL activity toward other RSV antigens, and this effect depends on its conserved central region. Here, we report that RSV-G can also improve CTL activity toward antigens from unrelated pathogens such as influenza, and that a mutant form of RSV-G lacking four conserved cysteine residues at positions 173, 176, 182, and 186 fails to enhance CTL responses. Our results indicate that these conserved residues are essential for the wide-spectrum pro-CTL activity displayed by the protein.
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23
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Unusual viral ligand with alternative interactions is presented by HLA-Cw4 in human respiratory syncytial virus-infected cells. Immunol Cell Biol 2010; 89:558-65. [PMID: 20975736 DOI: 10.1038/icb.2010.125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Short viral antigens bound to human major histocompatibility complex (HLA) class I molecules are presented on infected cells. Vaccine development frequently relies on synthetic peptides to identify optimal HLA class I ligands. However, when natural peptides are analyzed, more complex mixtures are found. By immunoproteomics analysis, we identify in this study a physiologically processed HLA ligand derived from the human respiratory syncytial virus matrix protein that is very different from what was expected from studies with synthetic peptides. This natural HLA-Cw4 class I ligand uses alternative interactions to the anchor motifs previously described for its presenting HLA-Cw4 class I molecule. Finally, this octameric peptide shares its C-terminal core with the H-2D(b) nonamer ligand previously identified in the mouse model. These data have implications for the identification of antiviral cytotoxic T lymphocyte responses and for vaccine development.
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24
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Tregoning JS, Yamaguchi Y, Wang B, Mihm D, Harker JA, Bushell ESC, Zheng M, Liao G, Peltz G, Openshaw PJM. Genetic susceptibility to the delayed sequelae of neonatal respiratory syncytial virus infection is MHC dependent. THE JOURNAL OF IMMUNOLOGY 2010; 185:5384-91. [PMID: 20921522 DOI: 10.4049/jimmunol.1001594] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Respiratory syncytial virus (RSV) is a major cause of respiratory morbidity, resulting in hospitalization for bronchiolitis in some infected infants that is associated with wheeze in later life. Genetic factors are known to affect the severity of the sequelae after RSV infection, but the complexity of the temporal and genetic effects makes it difficult to analyze this response in studies in man. Therefore, we developed a murine genetic model to analyze the sequelae occurring after RSV infection in early life. Haplotype-based genetic analysis of interstrain differences in severity identified the MHC as an important genetic determinant. This was confirmed by analysis of responses in congenic mice with different MHC haplotypes. We also found that susceptible strains had high CD8 levels during secondary infection. Analysis of first filial generation, second filial generation, and back-cross progeny produced by intercrossing resistant (H-2(k), C3H/HeN) and sensitive (H-2(b), BALB/c) strains indicated that susceptibility to sequelae after RSV infection was dominantly inherited but also segregated in a non-MHC-dependent manner. Thus, MHC haplotype and its effect on CD8 cell response is an important determinant of the outcome of neonatal RSV infection.
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Affiliation(s)
- John S Tregoning
- Department of Respiratory Medicine, Centre for Respiratory Infection, National Heart and Lung Institute, Imperial College London, London, United Kingdom
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25
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Anderson R, Huang Y, Langley JM. Prospects for defined epitope vaccines for respiratory syncytial virus. Future Microbiol 2010; 5:585-602. [DOI: 10.2217/fmb.10.22] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The history of vaccines for respiratory syncytial virus (RSV) illustrates the complex immunity and immunopathology to this ubiquitous virus, starting from the failed formalin-inactivated vaccine trials performed in the 1960s. An attractive alternative to traditional live or killed virus vaccines is a defined vaccine composed of discrete antigenic epitopes for which immunological activities have been characterized as comprehensively as possible. Here we present cumulative data on murine and human CD4, CD8 and neutralization epitopes identified in RSV proteins along with information regarding their associated immune responses and host-dependent variability. Identification and characterization of RSV epitopes is a rapidly expanding topic of research with potential contributions to the tailored design of improved safe and effective vaccines.
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Affiliation(s)
- Robert Anderson
- Department of Microbiology & Immunology, Pediatrics and Canadian Center for Vaccinology, Dalhousie University, Halifax, Nova Scotia, B3H 1X5, Canada
| | - Yan Huang
- Department of Microbiology & Immunology and Canadian Center for Vaccinology, Dalhousie University, Halifax, Nova Scotia, B3H 1X5, Canada
| | - Joanne M Langley
- Department of Pediatrics, Community Health & Epidemiology and Canadian Center for Vaccinology, Dalhousie University, Halifax, Nova Scotia, B3H 1X5, Canada
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26
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Infantes S, Lorente E, Barnea E, Beer I, Cragnolini JJ, García R, Lasala F, Jiménez M, Admon A, López D. Multiple, non-conserved, internal viral ligands naturally presented by HLA-B27 in human respiratory syncytial virus-infected cells. Mol Cell Proteomics 2010; 9:1533-9. [PMID: 20081153 DOI: 10.1074/mcp.m900508-mcp200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cytotoxic T lymphocyte (CTL)-mediated death of virus-infected cells requires prior recognition of short viral peptide antigens that are presented by human leukocyte antigen (HLA) class I molecules on the surface of infected cells. The CTL response is critical for the clearance of human respiratory syncytial virus (HRSV) infection. Using mass spectrometry analysis of complex HLA-bound peptide pools isolated from large amounts of HRSV-infected cells, we identified nine naturally processed HLA-B27 ligands. The isolated peptides are derived from six internal, not envelope, proteins of the infective virus. The sequences of most of these ligands are not conserved between different HRSV strains, suggesting a mechanism to explain recurrent infection with virus of different HRSV antigenic subgroups. In addition, these nine ligands represent a significant fraction of the proteome of this virus, which is monitored by the same HLA class I allele. These data have implications for vaccine development as well as for analysis of the CTL response.
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Affiliation(s)
- Susana Infantes
- Unidad de Protemica, Centro Nacional de Microbiología, Instituto de Salud Carlos III, 28220 Majadahonda, Madrid, Spain
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27
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Wierzbicki A, Gil M, Ciesielski M, Fenstermaker RA, Kaneko Y, Rokita H, Lau JT, Kozbor D. Immunization with a mimotope of GD2 ganglioside induces CD8+ T cells that recognize cell adhesion molecules on tumor cells. THE JOURNAL OF IMMUNOLOGY 2009; 181:6644-53. [PMID: 18941255 DOI: 10.4049/jimmunol.181.9.6644] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The GD2 ganglioside expressed on neuroectodermal tumor cells has been used as a target for passive and active immunotherapy in patients with malignant melanoma and neuroblastoma. We have reported that immunization of mice with a 47-LDA mimotope of GD2, isolated from a phage display peptide library with anti-GD2 mAb 14G2a, induces MHC class I-restricted CD8(+) T cell responses to syngeneic neuroblastoma tumor cells. The cytotoxic activity of the vaccine-induced CTLs was independent of GD2 expression, suggesting recognition of a novel tumor-associated Ag cross-reacting with 47-LDA. Glycan microarray and immunoblotting studies using 14G2a mAb demonstrated that this Ab is highly specific for the entire carbohydrate motif of GD2 but also cross-reacts with a 105 kDa glycoprotein expressed by GD2(+) and GD2(-) neuroblastoma and melanoma cells. Functional studies of tumor cells grown in three-dimensional collagen cultures with 14G2a mAb showed decreases in matrix metalloproteinase-2 activation, a process regulated by the 105 kDa-activated leukocyte cell adhesion molecule (ALCAM/CD166). A recombinant CD166 glycoprotein was shown to be recognized by 14G2a Ab and inhibition of CD166 expression by RNA interference ablated the cell sensitivity to lysis by 47-LDA-induced CD8(+) T cells in vitro and in vivo. The binding of 14G2a to CD166 was not disruptable by a variety of exo- and endo-glycosidases, implying recognition of a non-glycan epitope on CD166. These results suggest that the vaccine-induced CTLs recognize a 47-LDA cross-reactive epitope expressed by CD166, and reveal a novel mechanism of induction of potent tumor-specific cellular responses by mimotopes of tumor-associated carbohydrate Ags.
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Affiliation(s)
- Andrzej Wierzbicki
- Department of Immunology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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28
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Abstract
Respiratory syncytial virus (RSV) is the leading cause of severe respiratory disease in infants and is an important source of morbidity and mortality in the elderly and immunocompromised. This review will discuss the humoral and cellular adaptive immune responses to RSV infection and how these responses are shaped in the immature immune system of the infant and the aged environment of the elderly. Furthermore, we will provide an overview of our current understanding of the role the various arms of the adaptive immune response play in mediating the delicate balance between the successful elimination of the virus from the host and the induction of immunopathology. Efficacious immunization against RSV remains a high priority within the field and we will highlight recent advances made in vaccine design.
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Affiliation(s)
- Matthew R Olson
- Department of Microbiology, 51 Newton Road, 3−532 Bowen Science Building, University of Iowa, Iowa City, IA 52242, USA Tel.: +1 319 335 8433 Fax: +1 319 335 9006
| | - Steven M Varga
- Department of Microbiology, Interdisciplinary Graduate Program in Immunology, 51 Newton Road, 3−532 Bowen Science Building, University of Iowa, Iowa City, IA 52242, USA Tel.: +1 319 335 7784 Fax: +1 319 335 9006
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29
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Mok H, Lee S, Wright DW, Crowe JE. Enhancement of the CD8+ T cell response to a subdominant epitope of respiratory syncytial virus by deletion of an immunodominant epitope. Vaccine 2008; 26:4775-82. [PMID: 18662734 DOI: 10.1016/j.vaccine.2008.07.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2008] [Revised: 06/30/2008] [Accepted: 07/08/2008] [Indexed: 11/17/2022]
Abstract
Cytotoxic T lymphocytes (CTLs) are critical for the control of respiratory syncytial virus infection (RSV) in humans and mice. Recently, we identified a new H-2K(d)-restricted subdominant epitope in the respiratory syncytial virus M2 protein. In this study, we investigated if modification of anchor residues at positions 2 and 9 in the dominant M2(82-90) epitope in the M2 protein would alter the CTL epitope dominance hierarchy following immunization with plasmid DNA encoding M2 proteins. We showed that immunogenicity of the subdominant epitope M2(127-135) was enhanced when the anchor residues of the dominant epitope were mutated, suggesting that the immunodominant epitope induces a suppression of response to the subdominant epitope.
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Affiliation(s)
- Hoyin Mok
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN 37232, United States
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30
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Xing Y, Huang Z, Lin Y, Li J, Chou TH, Lu S, Wang S. The ability of Hepatitis B surface antigen DNA vaccine to elicit cell-mediated immune responses, but not antibody responses, was affected by the deglysosylation of S antigen. Vaccine 2008; 26:5145-52. [PMID: 18462847 DOI: 10.1016/j.vaccine.2008.03.072] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Hepatitis B Virus (HBV) infection remains a major worldwide infectious disease with serious long-term morbidity and mortality. The limited selections of drug treatment are not able to control the progress of disease in people with active and persistent HBV infection. Immunotherapy to control the degree of viral infection is one possible alternative solution to this challenge. HBV DNA vaccines, with their strong ability to induce cell-mediated immune responses, offer an attractive option. HBV surface protein is important in viral immunity. Re-establishing anti-S immunity in chronic HBV infected patients will bring significant benefit to the patients. Previous studies have shown that HBV S DNA vaccines are immunogenic in a number of animal studies. In the current study, we further investigated the effect of glycosylation to the expression and immunogenicity of S DNA vaccines. Our results demonstrate that deglycosylation at the two potential N-linked glycosylation sites in S protein resulted in a significant decrease of S-specific cell-mediated immune responses, but did not affect anti-S antibody responses. This finding provides important direction to the development of S DNA vaccines to elicit the optimal and balanced antibody and cell-mediated immune responses to treat people with HBV chronic infections.
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Affiliation(s)
- Yiping Xing
- Department of Infectious Diseases, Nanjing Medical University, and China-US Vaccine Research Center, Jiangsu Province Hospital, Nanjing 210029, China
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31
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Herd KA, Nissen MD, Hopkins PM, Sloots TP, Tindle RW. Major histocompatibility complex class I cytotoxic T lymphocyte immunity to human metapneumovirus (hMPV) in individuals with previous hMPV infection and respiratory disease. J Infect Dis 2008; 197:584-92. [PMID: 18240952 DOI: 10.1086/526536] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Recently identified human metapneumovirus (hMPV) is an important respiratory pathogen in children and adults worldwide. Little is known about cytotoxic T lymphocyte (CTL) responses that may control hMPV infection in humans. To address this, we evaluated major histocompatibility complex (MHC) class I T cell immunity in 7 patients with previous hMPV respiratory disease. CTL responses were evident in most patients and to most proteins of hMPV. Individual patients had responses to at least 2 hMPV proteins (particularly the M protein) and had multiallele responses. In addition, we identified 9 CTL epitopes that are presented by human leukocyte antigen alleles of the most common MHC "supertypes." Many of these CTL epitopes are conserved across hMPV types, and there is epitope similarity between hMPV and human respiratory syncytial virus. This study provides the first report of MHC class I T cell immunity to hMPV in humans. These findings have significance for understanding cellular immunity to hMPV infection and for future vaccine development.
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Affiliation(s)
- Karen A Herd
- Royal Children's Hospital, Herston, Queensland, Australia
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32
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The relative immunogenicity of DNA vaccines delivered by the intramuscular needle injection, electroporation and gene gun methods. Vaccine 2008; 26:2100-10. [PMID: 18378365 DOI: 10.1016/j.vaccine.2008.02.033] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Revised: 02/08/2008] [Accepted: 02/11/2008] [Indexed: 11/21/2022]
Abstract
Immunogenicity of DNA vaccines varies significantly due to many factors including the inherent immunogenicity of the protein antigen encoded in the DNA vaccine, the optimal immune responses that can be achieved in different animal models and in humans with different genetic backgrounds and, to a great degree, the delivery methods used to administer the DNA vaccines. Based on published results, only the gene gun-mediated delivery approach has been able to elicit protective levels of immune responses in healthy, adult volunteers by DNA immunization alone without the use of another vaccine modality as a boost. Recent results from animal studies suggest that electroporation is also effective in eliciting high level immune responses. However, there have been no reports to identify the similarities and differences between these two leading physical delivery methods for DNA vaccines against infectious disease targets. In the current study, we compared the relative immunogenicity of a DNA vaccine expressing a hemagglutinin (HA) antigen from an H5N1 influenza virus in two animal models (rabbit and mouse) when delivered by either intramuscular needle immunization (IM), gene gun (GG) or electroporation (EP). HA-specific antibody, T cell and B cell responses were analyzed. Our results indicate that, overall, both the GG and EP methods are more immunogenic than the IM method. However, EP and IM stimulated a Th-1 type antibody response and the antibody response to GG was Th-2 dominated. These findings provide important information for the further selection and optimization of DNA vaccine delivery methods for human applications.
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33
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Terrosi C, Di Genova G, Savellini GG, Correale P, Blardi P, Cusi MG. Immunological Characterization of Respiratory Syncytial Virus N Protein Epitopes Recognized by Human Cytotoxic T Lymphocytes. Viral Immunol 2007; 20:399-406. [DOI: 10.1089/vim.2007.0041] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Chiara Terrosi
- Microbiology Section, Department of Molecular Biology, University of Siena, Siena, Italy
| | - Giuseppa Di Genova
- Microbiology Section, Department of Molecular Biology, University of Siena, Siena, Italy
| | - Gianni Gori Savellini
- Microbiology Section, Department of Molecular Biology, University of Siena, Siena, Italy
| | - Pierpaolo Correale
- Medical Oncology Section, Department of Human Pathology and Oncology, University of Siena, Siena, Italy
| | - Patrizia Blardi
- Department of Clinical Medicine and Immunological Sciences, University of Siena, Siena, Italy
| | - Maria G. Cusi
- Microbiology Section, Department of Molecular Biology, University of Siena, Siena, Italy
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34
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Meyer G, Deplanche M, Schelcher F. Human and bovine respiratory syncytial virus vaccine research and development. Comp Immunol Microbiol Infect Dis 2007; 31:191-225. [PMID: 17720245 DOI: 10.1016/j.cimid.2007.07.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/12/2007] [Indexed: 11/23/2022]
Abstract
Human (HRSV) and bovine (BRSV) respiratory syncytial viruses (RSV) are two closely related viruses, which are the most important causative agents of respiratory tract infections of young children and calves, respectively. BRSV vaccines have been available for nearly 2 decades. They probably have reduced the prevalence of RSV infection but their efficacy needs improvement. In contrast, despite decades of research, there is no currently licensed vaccine for the prevention of HRSV disease. Development of a HRSV vaccine for infants has been hindered by the lack of a relevant animal model that develops disease, the need to immunize immunologically immature young infants, the difficulty for live vaccines to find the right balance between attenuation and immunogenicity, and the risk of vaccine-associated disease. During the past 15 years, intensive research into a HRSV vaccine has yielded vaccine candidates, which have been evaluated in animal models and, for some of them, in clinical trials in humans. Recent formulations have focused on subunit vaccines with specific CD4+ Th-1 immune response-activating adjuvants and on genetically engineered live attenuated vaccines. It is likely that different HRSV vaccines and/or combinations of vaccines used sequentially will be needed for the various populations at risk. This review discusses the recent advances in RSV vaccine development.
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Affiliation(s)
- Gilles Meyer
- INRA-ENVT, UMR1225 IHAP, Interactions Hôtes-Virus et Vaccinologie, Ecole Nationale Vétérinaire, 23 Chemin des Capelles, BP 87614, 31076 Toulouse Cedex, France.
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35
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Lee S, Miller SA, Wright DW, Rock MT, Crowe JE. Tissue-specific regulation of CD8+ T-lymphocyte immunodominance in respiratory syncytial virus infection. J Virol 2006; 81:2349-58. [PMID: 17182672 PMCID: PMC1865932 DOI: 10.1128/jvi.01910-06] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cytotoxic T lymphocytes (CTLs) are critical for control of respiratory syncytial virus (RSV) infection in humans and mice. To investigate cellular immune responses to infection, it is important to identify major histocompatibility complex (MHC) class I-restricted CTL epitopes. In this study, we identified a new RSV-specific, H-2K(d)-restricted subdominant epitope in the M2 protein, M2(127-135) (amino acids 127 to 135). This finding allowed us to study the frequency of T lymphocytes responding to two H-2K(d)-presented epitopes in the same protein following RSV infection by enzyme-linked immunospot (ELISPOT) and intracellular cytokine assays for both lymphoid and nonlymphoid tissues. For the subdominant epitope, we identified an optimal nine-amino-acid peptide, VYNTVISYI, which contained an H-2K(d) consensus sequence with Y at position 2 and I at position 9. In addition, an MHC class I stabilization assay using TAP-2-deficient RMA-S cells transfected with K(d) or L(d) indicated that the epitope was presented by K(d). The ratios of T lymphocytes during the peak CTL response to RSV infection that were specific for M2(82-90) (dominant) to T lymphocytes specific for M2(127-135) (subdominant) were approximately 3:1 in the spleen and 10:1 in the lung. These ratios were observed consistently in primary or secondary infection by the ELISPOT assay and in secondary infection by MHC/peptide tetramer staining. The number of antigen-specific T lymphocytes dropped in the 6 weeks after infection; however, the proportions of T lymphocytes specific for the immunodominant and subdominant epitopes were maintained to a remarkable degree in a tissue-specific manner. These studies will facilitate investigation of the regulation of immunodominance of RSV-specific CTL epitopes.
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Affiliation(s)
- Sujin Lee
- Department of Pediatrics, Vanderbilt University Medical Center, T-2220 Medical Center North, 1161 21st Avenue South, Nashville, TN 37232-2905, USA
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36
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de Waal L, Süzer Y, Wyatt LS, Sintnicolaas K, Sutter G, Moss B, Osterhaus ADME, de Swart RL. T Cell Responses to Respiratory Syncytial Virus Fusion and Attachment Proteins in Human Peripheral Blood Mononuclear Cells. Viral Immunol 2006; 19:669-78. [PMID: 17201662 DOI: 10.1089/vim.2006.19.669] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
The cellular immune response to respiratory syncytial virus (RSV) is considered important in both protection and immunopathogenesis. We have studied the HLA class I- and class II-restricted T cell responses to RSV fusion (F) and attachment (G) proteins in peripheral blood mononuclear cells (PBMCs) obtained from healthy young adults. PBMCs were stimulated with autologous cells infected with recombinant modified vaccinia virus Ankara (rMVA) expressing RSV F (rMVA-F) or G (rMVA-G). In rMVA-F-stimulated bulk cultures F-specific CD4(+) and CD8(+) T cell responses were demonstrated, whereas in rMVA-G-stimulated cultures only G-specific CD4(+) T cell responses were detected. Using a set of overlapping peptides spanning the F protein, a number of the F-specific T cell responses could be mapped to different antigenic regions, whereas for the G protein only CD4(+) T cell responses recognizing the central conserved domain could be detected. These results suggest that the RSV glycoprotein-specific T cell response is directed to a number of different epitopes. Further studies must be performed to confirm the apparent inability of the RSV G protein to induce CD8(+) T cell responses. The rMVA-based in vitro stimulation protocol will be useful to define protein-specific T cell responses in different viral systems.
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Affiliation(s)
- Leon de Waal
- Department of Virology, Erasmus MC, Rotterdam, The Netherlands.
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37
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Bukreyev A, Serra ME, Laham FR, Melendi GA, Kleeberger SR, Collins PL, Polack FP. The cysteine-rich region and secreted form of the attachment G glycoprotein of respiratory syncytial virus enhance the cytotoxic T-lymphocyte response despite lacking major histocompatibility complex class I-restricted epitopes. J Virol 2006; 80:5854-61. [PMID: 16731924 PMCID: PMC1472564 DOI: 10.1128/jvi.02671-05] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The cytotoxic T-lymphocyte (CTL) response is important for the control of viral replication during respiratory syncytial virus (RSV) infection. The attachment glycoprotein (G) of RSV does not encode major histocompatibility complex class I-restricted epitopes in BALB/c mice (H-2(d)). Furthermore, studies to date have described an absence of significant CTL activity directed against this protein in humans. Therefore, G previously was not considered necessary for the generation of RSV-specific CTL responses. In this study, we demonstrate that, despite lacking H-2(d)-restricted epitopes, G enhances the generation of an effective CTL response against RSV. Furthermore, we show that this stimulatory effect is independent of virus titers and RSV-induced inflammation; that it is associated primarily with the secreted form of G; and that the effect depends on the cysteine-rich region of G (GCRR), a segment conserved in wild-type isolates worldwide. These findings reveal a novel function for the GCRR with potential implications for the generation of protective cellular responses and vaccine development.
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Affiliation(s)
- Alexander Bukreyev
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
| | - Maria Elina Serra
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
| | - Federico R. Laham
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
| | - Guillermina A. Melendi
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
| | - Steven R. Kleeberger
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
| | - Peter L. Collins
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
| | - Fernando P. Polack
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, INFANT Fundacion, Buenos Aires, Argentina, Department of Pediatrics, School of Medicine, Johns Hopkins University, Baltimore, Maryland, National Institute of Environmental Health Sciences, NIH, Research Triangle, North Carolina
- Corresponding author. Mailing address: Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St., E5202, Baltimore, MD 21205. Phone: (443) 287-6407. Fax: (410) 955-0105. E-mail:
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38
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Rutigliano JA, Rock MT, Johnson AK, Crowe JE, Graham BS. Identification of an H-2D(b)-restricted CD8+ cytotoxic T lymphocyte epitope in the matrix protein of respiratory syncytial virus. Virology 2005; 337:335-43. [PMID: 15916793 DOI: 10.1016/j.virol.2005.04.032] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2005] [Revised: 03/08/2005] [Accepted: 04/25/2005] [Indexed: 11/25/2022]
Abstract
Cytotoxic T lymphocytes (CTL) play a significant role in the clearance of respiratory syncytial virus (RSV) infection in humans and mice. Identification of class I MHC-restricted CTL epitopes is critical in elucidating mechanisms of CTL responses against viral infections. However, only four H-2d-restricted epitopes have been reported in mice. Because of the diversity of transgenic and knockout mice available to study immune responses, new epitopes in additional strains of mice must be identified. We therefore attempted to discover novel CTL epitopes in C57Bl/6 mice. Our efforts revealed a new H-2D(b)-restricted CTL epitope from the RSV M protein, corresponding to aa 187-195 (NAITNAKII). Also, M187-195-specific CTLs were activated with kinetics similar to the immunodominant BALB/c epitope, M2 82-90. This is the first RSV-specific CTL epitope described in a strain of mice other than BALB/c. Furthermore, identification of this H-2b-restricted CTL epitope provides access to genetically modified H-2b mice for more detailed studies of CTL mechanisms in RSV infection.
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Affiliation(s)
- John A Rutigliano
- Vaccine Research Center, NIAID, National Institutes of Health, Building 40, Room 2502, 40 Convent Drive, MSC 3017, Bethesda, MD 20892-3017, USA
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Agenbach E, Tiemessen CT, Venter M. Amino acid variation within the fusion protein of respiratory syncytial virus subtype A and B strains during annual epidemics in South Africa. Virus Genes 2005; 30:267-78. [PMID: 15744582 DOI: 10.1007/s11262-004-5633-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2004] [Accepted: 10/05/2004] [Indexed: 10/25/2022]
Abstract
Recent evidence of positive selection within the cytotoxic T-cell (CTL) epitopes of the highly conserved nucleoprotein of influenza virus raised the question of whether the CTL epitopes of Respiratory syncytial virus (RSV) are also affected by immune driven change over annual epidemics. The fusion protein (F-protein) of RSV is highly conserved within the two subtypes (A and B) and the most important target for the protective response. The position of various neutralizing epitopes has been mapped and characterized between RSV subtypes. CTL epitopes have also recently been mapped for the F-protein of subtype A, however variation within these epitopes between and within the subtypes has not been determined. To address this question, the F-proteins of 18 strains representative of all subgroup A and B genotypes identified in South Africa over a period of 5 years were sequenced. F-protein sequences were highly conserved within and between South African genotypes, with most variability occurring at the nucleotide level. Most of the amino acid differences identified within neutralizing and CTL epitopes were conserved within the subtypes, and therefore does not indicate immune selection. However, out of three CTL epitopes previously identified in subtype A, two (restricted to HLA B*57 and HLA A *01) were conserved only within subtype A, while the third (restricted to Cw*12) contained both subtype- and genotype-specific changes. These results suggest that most of the identified CTL epitopes are subtype A-specific and may not be recognized in subtype B viruses, while the HLA Cw*12 restricted epitope may also not be recognized efficiently in GA5 strains.
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Affiliation(s)
- Elizabeth Agenbach
- National Institute for Communicable Diseases, Private bag X4, Modderfonteinroad, 2131, Sandringham, South Africa
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40
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Chen X, Rock MT, Hammonds J, Tartaglia J, Shintani A, Currier J, Slike B, Crowe JE, Marovich M, Spearman P. Pseudovirion particle production by live poxvirus human immunodeficiency virus vaccine vector enhances humoral and cellular immune responses. J Virol 2005; 79:5537-47. [PMID: 15827168 PMCID: PMC1082749 DOI: 10.1128/jvi.79.9.5537-5547.2005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Live-vector-based human immunodeficiency virus (HIV) vaccines are an integral part of a number of HIV vaccine regimens currently under evaluation. Live vectors that carry an intact gag gene are capable of eliciting HIV pseudovirion particle formation from infected host cells. The impact of pseudovirion particle formation on the immune response generated by live HIV vaccine vectors has not been established. In this study, a canarypox HIV vaccine candidate vector expressing HIV gag and env genes, vCP205, was modified by the introduction of a glycine-to-alanine coding change in the N-terminal myristylation site of gag to create Myr- vCP205. This substitution effectively eliminated particle formation without altering the level of protein production. vCP205 and Myr- vCP205 were then directly compared for the ability to induce HIV-specific immune responses in mice. The particle-competent vector vCP205 elicited higher levels of CD8+ T-cell responses, as indicated by gamma interferon enzyme-linked immunospot (ELISPOT) assay and intracellular cytokine staining. Humoral responses to Gag and Env were also markedly higher from animals immunized with the particle-competent vector. Furthermore, HIV-specific CD4+ T-cell responses were greater among animals immunized with the particle-competent vector. Using a human dendritic cell model of antigen presentation in vitro, vCP205 generated greater ELISPOT responses than Myr- vCP205. These results demonstrate that pseudovirion particle production by live-vector HIV vaccines enhances HIV-specific cellular and humoral immune responses.
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Affiliation(s)
- Xuemin Chen
- Vanderbilt University School of Medicine, Pediatric Infectious Diseases, D-7235 MCN, Nashville, TN 37232-2581, USA
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41
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Rock MT, Yoder SM, Wright PF, Talbot TR, Edwards KM, Crowe JE. Differential regulation of granzyme and perforin in effector and memory T cells following smallpox immunization. THE JOURNAL OF IMMUNOLOGY 2005; 174:3757-64. [PMID: 15749916 DOI: 10.4049/jimmunol.174.6.3757] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Primary immunization of healthy adults with vaccinia virus induces a local vesicle or "take" in the majority of vaccinees that previously has been shown to correlate with protection against smallpox. However, the immunologic mechanisms underlying this protective response in humans are not well characterized. We have studied human CD8+ T cells for the expression patterns of phenotypic markers and cytolytic effector molecules before and after primary smallpox immunization using nine-color polychromatic flow cytometry. One month after immunization, vaccinees developed vaccinia virus-specific CD8+ T cells with an effector cell phenotype containing both granzyme A and granzyme B. One year after immunization, we found a significant decrease in granzyme B containing cells and an increased memory cell phenotype in virus-specific CD8+ T cells. Perforin was rarely expressed directly ex vivo, but was highly expressed after Ag-specific activation in vitro. Together, these data suggest an important role for effector CD8+ T cells in controlling poxvirus infection, and have implications for our understanding of human CD8+ T cell differentiation.
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Affiliation(s)
- Michael T Rock
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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42
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Heidema J, de Bree GJ, de Graaff PMA, van Maren WWC, Hoogerhout P, Out TA, Kimpen JLL, van Bleek GM. Human CD8(+) T cell responses against five newly identified respiratory syncytial virus-derived epitopes. J Gen Virol 2004; 85:2365-2374. [PMID: 15269378 DOI: 10.1099/vir.0.80131-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
CD8(+) T lymphocytes play a major role in the clearance of respiratory syncytial virus (RSV) infections. To be able to study the primary CTL response in RSV-infected children, epitopes presented by a set of commonly used HLA alleles (HLA-A1, -A3, -B44 and -B51) were searched for. Five epitopes were characterized derived from the matrix (M), non-structural (NS2) and second matrix (M2) proteins of RSV. All epitopes were shown to be processed and presented by RSV-infected antigen-presenting cells. HLA-A1 tetramers for one of these epitopes derived from the M protein were constructed and used to quantify and phenotype the memory CD8(+) T cell pool in a panel of healthy adult donors. In about 60 % of the donors, CD8(+) T cells specific for the M protein could be identified. These cells belonged to the memory T cell subset characterized by expression of CD27 and CD28, and down-regulation of CCR7 and CD45RA. The frequency of tetramer-positive cells varied between 0.4 and 3 per 10(4) CD8(+) T cells in PBMC of healthy asymptomatic adult donors.
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Affiliation(s)
- Jojanneke Heidema
- Division of Pediatrics, Wilhelmina Children's Hospital, University Medical Center, KE 04.133.1, PO Box 85500, 3508 AB Utrecht, The Netherlands
| | - Godelieve J de Bree
- Division of Pulmonology and the Department of Experimental Immunology, Academic Medical Center, Amsterdam, The Netherlands
| | - Patricia M A de Graaff
- Division of Pediatrics, Wilhelmina Children's Hospital, University Medical Center, KE 04.133.1, PO Box 85500, 3508 AB Utrecht, The Netherlands
| | - Wendy W C van Maren
- Division of Pediatrics, Wilhelmina Children's Hospital, University Medical Center, KE 04.133.1, PO Box 85500, 3508 AB Utrecht, The Netherlands
| | | | - Theo A Out
- Division of Clinical Immunology, Academic Medical Center, Amsterdam, The Netherlands
| | - Jan L L Kimpen
- Division of Pediatrics, Wilhelmina Children's Hospital, University Medical Center, KE 04.133.1, PO Box 85500, 3508 AB Utrecht, The Netherlands
| | - Grada M van Bleek
- Division of Pediatrics, Wilhelmina Children's Hospital, University Medical Center, KE 04.133.1, PO Box 85500, 3508 AB Utrecht, The Netherlands
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43
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de Waal L, Yüksel S, Brandenburg AH, Langedijk JPM, Sintnicolaas K, Verjans GMGM, Osterhaus ADME, de Swart RL. Identification of a common HLA-DP4-restricted T-cell epitope in the conserved region of the respiratory syncytial virus G protein. J Virol 2004; 78:1775-81. [PMID: 14747542 PMCID: PMC369497 DOI: 10.1128/jvi.78.4.1775-1781.2004] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The cellular immune response to respiratory syncytial virus (RSV) is important in both protection and immunopathogenesis. In contrast to HLA class I, HLA class II-restricted RSV-specific T-cell epitopes have not been identified. Here, we describe the generation and characterization of two human RSV-specific CD4(+)-T-cell clones (TCCs) associated with type 0-like cytokine profiles. TCC 1 was specific for the matrix protein and restricted over HLA-DPB1*1601, while TCC 2 was specific for the attachment protein G and restricted over either HLA-DPB1*0401 or -0402. Interestingly, the latter epitope is conserved in both RSV type A and B viruses. Given the high allele frequencies of HLA-DPB1*0401 and -0402 worldwide, this epitope could be widely recognized and boosted by recurrent RSV infections. Indeed, peptide stimulation of peripheral blood mononuclear cells from healthy adults resulted in the detection of specific responses in 8 of 13 donors. Additional G-specific TCCs were generated from three of these cultures, which recognized the identical (n = 2) or almost identical (n = 1) HLA-DP4-restricted epitope as TCC 2. No significant differences were found between the capacities of cell lines obtained from infants with severe (n = 41) or mild (n = 46) RSV lower respiratory tract infections to function as antigen-presenting cells to the G-specific TCCs, suggesting that the severity of RSV disease is not linked to the allelic frequency of HLA-DP4. In conclusion, we have identified an RSV G-specific human T helper cell epitope restricted by the widely expressed HLA class II alleles DPB1*0401 and -0402. Its putative role in protection and/or immunopathogenesis remains to be determined.
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Affiliation(s)
- L de Waal
- Department of Virology, Erasmus MC, Rotterdam, The Netherlands
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