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Rolsma SL, Yoder SM, Nargi RS, Brady E, Jimenez-Truque N, Thomsen I, Kontos M, Carnahan RH, Sutton RE, Armstrong E, Dally L, Crowe JE, Edwards KM, Creech CB. Development of a Kinetic ELISA and Reactive B Cell Frequency Assay to Detect Respiratory Syncytial Virus Pre-Fusion F Protein-Specific Immune Responses in Infants. J Pediatric Infect Dis Soc 2023; 12:298-305. [PMID: 37029694 PMCID: PMC10231354 DOI: 10.1093/jpids/piad019] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 04/07/2023] [Indexed: 04/09/2023]
Abstract
BACKGROUND Respiratory syncytial virus (RSV) is a major cause of respiratory disease in infants, making vaccination an attractive preventive strategy. Due to earlier reports of vaccine-enhanced disease in RSV-naive children, assessing prior RSV infection is critical for determining eligibility for future infant vaccine trials. However, this is complicated by the presence of maternally transferred maternal antibodies. We sought to develop assays that measure immune responses to RSV pre-fusion (F) protein that discriminates between maternal and infant responses. METHODS We measured RSV-specific responses in two groups of children <3 years of age; those with laboratory-confirmed RSV (RSV-infected) and those enrolled prior to their first RSV season (RSV-uninfected). Serial blood samples were obtained and recent infections with RSV and other respiratory viruses were assessed during follow-up. An RSV pre-F-specific kinetic enzyme-linked immunosorbent assay (kELISA) and an F-specific reactive B cell frequency (RBF) assay were developed. RESULTS One hundred two young children were enrolled between July 2015 and April 2017; 74 were in the RSV-uninfected group and 28 were in the RSV-infected group. Participants were asked to provide sequential blood samples over time, but only 53 participants in the RSV-uninfected group and 22 participants in the RSV-infected groups provided multiple samples. In the RSV-infected group, most had positive kELISA and RBF during the study. In the RSV-uninfected group, two patterns emerged: declining kELISA values without reactive B cells, due to maternal transplacental antibody transfer, and persistently positive kELISA with reactive B cells, due to asymptomatic undiagnosed RSV infection. CONCLUSIONS A kELISA targeting RSV pre-F epitopes and an RBF assay targeting RSV F-specific B cells generally allow discrimination between maternally and infant-derived antibodies.
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Affiliation(s)
- Stephanie L Rolsma
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Sandra M Yoder
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Rachel S Nargi
- Vanderbilt Vaccine Center, Department of Pediatrics, and Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Eric Brady
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Natalia Jimenez-Truque
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Isaac Thomsen
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | | | - Robert H Carnahan
- Vanderbilt Vaccine Center, Department of Pediatrics, and Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Rachel E Sutton
- Vanderbilt Vaccine Center, Department of Pediatrics, and Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Erica Armstrong
- Vanderbilt Vaccine Center, Department of Pediatrics, and Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Len Dally
- The Emmes Company, LLC, Rockville, Maryland, USA
| | - James E Crowe
- Vanderbilt Vaccine Center, Department of Pediatrics, and Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Kathryn M Edwards
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - C Buddy Creech
- Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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Pischedda S, Rivero-Calle I, Gómez-Carballa A, Cebey-López M, Barral-Arca R, Gómez-Rial J, Pardo-Seco J, Curras-Tuala MJ, Viz-Lasheras S, Bello X, Crujeiras AB, Diaz-Lagares A, González-López MT, Martinón-Torres F, Salas A. Role and Diagnostic Performance of Host Epigenome in Respiratory Morbidity after RSV Infection: The EPIRESVi Study. Front Immunol 2022; 13:875691. [PMID: 35619695 PMCID: PMC9128527 DOI: 10.3389/fimmu.2022.875691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 04/04/2022] [Indexed: 11/20/2022] Open
Abstract
Background Respiratory syncytial virus (RSV) infection has been associated with the subsequent development of recurrent wheezing and asthma, although the mechanisms involved are still unknown. We investigate the role of epigenetics in the respiratory morbidity after infection by comparing methylation patterns from children who develop recurrent wheezing (RW-RSV), subsequent asthma (AS-RVS), and those experiencing complete recovery (CR-RSV). Methods Prospective, observational study of infants aged < 2 years with RSV respiratory infection admitted to hospital and followed-up after discharge for at least three years. According to their clinical course, patients were categorized into subgroups: RW-RSV (n = 36), AS-RSV (n = 9), and CR-RSV (n = 32). The DNA genome-wide methylation pattern was analyzed in whole blood samples, collected during the acute phase of the infection, using the Illumina Infinium Methylation EPIC BeadChip (850K CpG sites). Differences in methylation were determined through a linear regression model adjusted for age, gender and cell composition. Results Patients who developed respiratory sequelae showed a statistically significant higher proportion of NK and CD8T cells (inferred through a deconvolution approach) than those with complete recovery. We identified 5,097 significant differentially methylated positions (DMPs) when comparing RW-RSV and AS-RVS together against CR-RSV. Methylation profiles affect several genes involved in airway inflammation processes. The most significant DMPs were found to be hypomethylated in cases and therefore generally leading to overexpression of affected genes. The lead CpG position (cg24509398) falls at the gene body of EYA3 (P-value = 2.77×10-10), a tyrosine phosphatase connected with pulmonary vascular remodeling, a key process in the asthma pathology. Logistic regression analysis resulted in a diagnostic epigenetic signature of 3-DMPs (involving genes ZNF2698, LOC102723354 and RPL15/NKIRAS1) that allows to efficiently differentiate sequelae cases from CR-RSV patients (AUC = 1.00). Enrichment pathway analysis reveals the role of the cell cycle checkpoint (FDR P-value = 4.71×10-2), DNA damage (FDP-value = 2.53×10-2), and DNA integrity checkpoint (FDR P-value = 2.56×10-2) in differentiating sequelae from CR-RSV patients. Conclusions Epigenetic mechanisms might play a fundamental role in the long-term sequelae after RSV infection, contributing to explain the different phenotypes observed.
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Affiliation(s)
- Sara Pischedda
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Irene Rivero-Calle
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Alberto Gómez-Carballa
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Miriam Cebey-López
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain
| | - Ruth Barral-Arca
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain
| | - Jose Gómez-Rial
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Jacobo Pardo-Seco
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - María-José Curras-Tuala
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Sandra Viz-Lasheras
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Xabier Bello
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Ana B Crujeiras
- Epigenomics in Endocrinology and Nutrition Group, Epigenomics Unit, Instituto De Investigación Sanitaria De Santiago De Compostela (IDIS), Complejo Hospitalario Universitario De Santiago De Compostela (CHUS/SERGAS), Santiago de Compostela, Spain.,Centro De Investigación Biomédica En Red Fisiopatología De La Obesidad Y Nutrición (Ciberobn), Madrid, Spain
| | - Angel Diaz-Lagares
- Cancer Epigenomics, Epigenomics Unit, Translational Medical Oncology (Oncomet), Instituto De Investigación Sanitaria De Santiago De Compostela (IDIS), Complejo Hospitalario Universitario De Santiago De Compostela (CHUS/SERGAS), Santiago De Compostela, Spain.,Centro De Investigación Biomédica En Red Cancer (CIBERONC), Madrid, Spain
| | | | - Federico Martinón-Torres
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,Translational Pediatrics and Infectious Diseases, Department of Pediatrics, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain
| | - Antonio Salas
- Genetics, Vaccines, Infectious Diseases and Pediatrics Research Group (GENVIP), Instituto de Investigación Sanitaria de Santiago, Santiago de Compostela, Santiago de Compostela, Spain.,GenPoB Research Group, Instituto de Investigacinó Sanitaria (IDIS), Hospital Clínico Universitario de Santiago (SERGAS), Unidade de Xenética, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBER-ES), Madrid, Spain.,Instituto de Ciencias Forenses, Facultade de Medicina, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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3
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Chu HY, Newman KL, Englund JA, Cho S, Bull C, Lacombe K, Carlin K, Bulkow LR, Rudolph K, DeByle C, Berner J, Klejka J, Singleton R. Transplacental Respiratory Syncytial Virus and Influenza Virus Antibody Transfer in Alaska Native and Seattle Mother-Infant Pairs. J Pediatric Infect Dis Soc 2021; 10:230-236. [PMID: 32369172 PMCID: PMC8023314 DOI: 10.1093/jpids/piaa040] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 04/15/2020] [Indexed: 11/15/2022]
Abstract
BACKGROUND Alaska Native (AN) infants are at risk for severe disease due to respiratory syncytial virus (RSV) and influenza. Maternal immunization protects young infants through transplacental antibody transfer. RSV- and influenza-specific transplacental antibody transfer in mother-infant pairs has not previously been evaluated in the AN population. METHODS Serum samples collected during pregnancy and at birth from AN mother-infant pairs in the Yukon-Kuskokwim Delta region (YKD) of Alaska (2000-2011; n = 75) and predominantly white pairs in Seattle, Washington (2014-2016; n = 57), were tested for RSV and influenza antibody using a microneutralization and hemagglutination inhibition assay, respectively, and compared between sites. RESULTS Mean RSV antibody concentrations in pregnant women in YKD and Seattle were similar (log2 RSV antibody 10.6 vs 10.7, P = .86), but cord blood RSV antibody concentrations were significantly lower in infants born to mothers in YKD compared with Seattle (log2 RSV antibody 11.0 vs 12.2, P < .001). Maternal and cord blood influenza antibody concentrations were lower for women and infants in YKD compared with Seattle for all 4 influenza antigens tested (all P < .05). The mean cord to maternal RSV antibody transfer ratio was 1.15 (standard deviation [SD], 0.13) in mother-infant pairs in Seattle compared with 1.04 (SD, 0.08) in YKD. Mean cord blood to maternal antibody transfer ratios for influenza antigens ranged from 1.22 to 1.42 in Seattle and from 1.05 to 1.59 in YKD. CONCLUSIONS Though the transplacental antibody transfer ratio was high (>1.0) for both groups, transfer ratios for RSV antibody were significantly lower in AN mother-infant pairs. Further studies are needed to elucidate the impact of lower transplacental antibody transfer on infant disease risk in rural Alaska.Alaska Native and continental US mother-infant pairs have high transplacental antibody transfer ratios (>1.0) for influenza and respiratory syncytial virus, but anti-respiratory syncytial virus antibody levels are significantly lower in Alaska Native pairs than in those from the continental US.
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Affiliation(s)
- Helen Y Chu
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Kira L Newman
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Janet A Englund
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
- Seattle Children’s Research Institute, Seattle, Washington, USA
| | - Shari Cho
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Catherine Bull
- Seattle Children’s Research Institute, Seattle, Washington, USA
| | - Kirsten Lacombe
- Seattle Children’s Research Institute, Seattle, Washington, USA
| | - Kristen Carlin
- Seattle Children’s Research Institute, Seattle, Washington, USA
| | - Lisa R Bulkow
- Arctic Investigations Program Centers for Disease Control, Anchorage, Alaska, USA
| | - Karen Rudolph
- Arctic Investigations Program Centers for Disease Control, Anchorage, Alaska, USA
| | - Carolynn DeByle
- Arctic Investigations Program Centers for Disease Control, Anchorage, Alaska, USA
| | - James Berner
- Alaska Native Tribal Health Consortium, Anchorage, Alaska, USA
| | - Joseph Klejka
- Yukon Kuskokwim Health Corporation, Bethel, Alaska, USA
| | - Rosalyn Singleton
- Arctic Investigations Program Centers for Disease Control, Anchorage, Alaska, USA
- Alaska Native Tribal Health Consortium, Anchorage, Alaska, USA
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4
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Naran K, Nundalall T, Chetty S, Barth S. Principles of Immunotherapy: Implications for Treatment Strategies in Cancer and Infectious Diseases. Front Microbiol 2018; 9:3158. [PMID: 30622524 PMCID: PMC6308495 DOI: 10.3389/fmicb.2018.03158] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 12/05/2018] [Indexed: 12/13/2022] Open
Abstract
The advances in cancer biology and pathogenesis during the past two decades, have resulted in immunotherapeutic strategies that have revolutionized the treatment of malignancies, from relatively non-selective toxic agents to specific, mechanism-based therapies. Despite extensive global efforts, infectious diseases remain a leading cause of morbidity and mortality worldwide, necessitating novel, innovative therapeutics that address the current challenges of increasing antimicrobial resistance. Similar to cancer pathogenesis, infectious pathogens successfully fashion a hospitable environment within the host and modulate host metabolic functions to support their nutritional requirements, while suppressing host defenses by altering regulatory mechanisms. These parallels, and the advances made in targeted therapy in cancer, may inform the rational development of therapeutic interventions for infectious diseases. Although "immunotherapy" is habitually associated with the treatment of cancer, this review accentuates the evolving role of key targeted immune interventions that are approved, as well as those in development, for various cancers and infectious diseases. The general features of adoptive therapies, those that enhance T cell effector function, and ligand-based therapies, that neutralize or eliminate diseased cells, are discussed in the context of specific diseases that, to date, lack appropriate remedial treatment; cancer, HIV, TB, and drug-resistant bacterial and fungal infections. The remarkable diversity and versatility that distinguishes immunotherapy is emphasized, consequently establishing this approach within the armory of curative therapeutics, applicable across the disease spectrum.
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Affiliation(s)
- Krupa Naran
- Medical Biotechnology and Immunotherapy Unit, Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Trishana Nundalall
- Medical Biotechnology and Immunotherapy Unit, Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Shivan Chetty
- Medical Biotechnology and Immunotherapy Unit, Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Stefan Barth
- Medical Biotechnology and Immunotherapy Unit, Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- South African Research Chair in Cancer Biotechnology, Department of Integrative Biomedical Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
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5
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Obasi N, Kaior G, Ibezim A, Ochonogor AE, Rhyman L, Uahengo V, Lutter M, Jurkschat K, Ramasami P. Synthesis, characterization, antimicrobial screening and in silico studies of Schiff bases derived from trans- para -methoxycinnamaldehyde. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.07.097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Trento A, Rodríguez-Fernández R, González-Sánchez MI, González-Martínez F, Mas V, Vázquez M, Palomo C, Melero JA. The Complexity of Antibody Responses Elicited against the Respiratory Syncytial Virus Glycoproteins in Hospitalized Children Younger than 2 Years. Front Microbiol 2017; 8:2301. [PMID: 29213258 PMCID: PMC5702767 DOI: 10.3389/fmicb.2017.02301] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 11/08/2017] [Indexed: 11/13/2022] Open
Abstract
The influence of age and maternal antibodies on the antibody responses to human respiratory syncytial virus (hRSV) glycoproteins in very young children has been a matter of controversy. Both, immaturity of the immune system at very early age and suppression of the host immune response by high level of maternal antibodies have been claimed to limit the host antibody response to virus infection and to jeopardize the use of hRSV vaccines under development in that age group. Hence, the antibody responses to the two major hRSV glycoproteins (F and G) were evaluated in children younger than 2 years, hospitalized with laboratory confirmed hRSV bronchiolitis. A strong negative correlation was found between the titre of circulating ELISA antibodies directed against either prefusion or postfusion F in the acute phase, but not age, and their fold change at convalescence. These changes correlated also with the level of circulating neutralizing antibodies in sera. As reported in adults, most neutralizing antibodies in a subset of tested sera could not be depleted with postfusion F, suggesting that they were mostly directed against prefusion-specific epitopes. In contrast, a weak negative association was found for group-specific anti-G antibodies in the acute phase and their fold change at convalescence only after correcting for the antigenic group of the infecting virus. In addition, large discrepancies were observed in some individuals between the antibody responses specific for F and G glycoproteins. These results illustrate the complexity of the anti-hRSV antibody responses in children experiencing a primary severe infection and the influence of preexisting maternal antibodies on the host response, factors that should influence hRSV serological studies as well as vaccine development.
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Affiliation(s)
- Alfonsina Trento
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain.,CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Rosa Rodríguez-Fernández
- Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón - CIBEREHD, Madrid, Spain
| | - María I González-Sánchez
- Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón - CIBEREHD, Madrid, Spain
| | - Felipe González-Martínez
- Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón - CIBEREHD, Madrid, Spain
| | - Vicente Mas
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain.,CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Mónica Vázquez
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain.,CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Concepción Palomo
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain.,CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - José A Melero
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain.,CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
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7
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Obasi L, Kaior G, Rhyman L, Alswaidan IA, Fun HK, Ramasami P. Synthesis, characterization, antimicrobial screening and computational studies of 4-[3-(4-methoxy-phenyl)-allylideneamino]-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.05.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Homaira N, Rawlinson W, Snelling TL, Jaffe A. Effectiveness of Palivizumab in Preventing RSV Hospitalization in High Risk Children: A Real-World Perspective. Int J Pediatr 2014; 2014:571609. [PMID: 25548575 PMCID: PMC4274815 DOI: 10.1155/2014/571609] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 10/15/2014] [Accepted: 10/15/2014] [Indexed: 11/23/2022] Open
Abstract
Infection with respiratory syncytial virus (RSV) is one of the major causes globally of childhood respiratory morbidity and hospitalization. Palivizumab, a humanized monoclonal antibody, has been recommended for high risk infants to prevent severe RSV-associated respiratory illness. This recommendation is based on evidence of efficacy when used under clinical trial conditions. However the real-world effectiveness of palivizumab outside of clinical trials among different patient populations is not well established. We performed a systematic review focusing on postlicensure observational studies of the protective effect of palivizumab prophylaxis for reducing RSV-associated hospitalizations in infants and children at high risk of severe infection. We searched studies published in English between 1 January 1999 and August 2013 and identified 420 articles, of which 20 met the inclusion criteria. This review supports the recommended use of palivizumab for reducing RSV-associated hospitalization rates in premature infants born at gestational age < 33 weeks and in children with chronic lung and heart diseases. Data are limited to allow commenting on the protective effect of palivizumab among other high risk children, including those with Down syndrome, cystic fibrosis, and haematological malignancy, indicating further research is warranted in these groups.
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Affiliation(s)
- Nusrat Homaira
- Disciplines of Paediatrics, School of Women's and Children's Health, UNSW, Sydney Children's Hospital, Level 3, Emergency Wing, Randwick, Sydney, NSW 2031, Australia
| | - William Rawlinson
- Virology Division, SEALS Microbiology, Prince of Wales Hospital, Randwick, Sydney, NSW 2031, Australia
- School of Medical Sciences, UNSW, Sydney, NSW, Australia
- Biotechnology and Biomolecular Sciences, UNSW, Sydney, NSW, Australia
| | - Thomas L. Snelling
- Telethon Kids Institute, University of Western Australia, 100 Roberts Road, Subiaco, WA 6009, Australia
| | - Adam Jaffe
- Disciplines of Paediatrics, School of Women's and Children's Health, UNSW, Sydney Children's Hospital, Level 3, Emergency Wing, Randwick, Sydney, NSW 2031, Australia
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Palomo C, Mas V, Vázquez M, Cano O, Luque D, Terrón MC, Calder LJ, Melero JA. Polyclonal and monoclonal antibodies specific for the six-helix bundle of the human respiratory syncytial virus fusion glycoprotein as probes of the protein post-fusion conformation. Virology 2014; 460-461:119-27. [PMID: 25010277 DOI: 10.1016/j.virol.2014.05.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 03/28/2014] [Accepted: 05/01/2014] [Indexed: 12/01/2022]
Abstract
Human respiratory syncytial virus (hRSV) has two major surface glycoproteins (G and F) anchored in the lipid envelope. Membrane fusion promoted by hRSV_F occurs via refolding from a pre-fusion form to a highly stable post-fusion state involving large conformational changes of the F trimer. One of these changes results in assembly of two heptad repeat sequences (HRA and HRB) into a six-helix bundle (6HB) motif. To assist in distinguishing pre- and post-fusion conformations of hRSV_F, we have prepared polyclonal (α-6HB) and monoclonal (R145) rabbit antibodies specific for the 6HB. Among other applications, these antibodies were used to explore the requirements of 6HB formation by isolated protein segments or peptides and by truncated mutants of the F protein. Site-directed mutagenesis and electron microscopy located the R145 epitope in the post-fusion hRSV_F at a site distantly located from previously mapped epitopes, extending the repertoire of antibodies that can decorate the F molecule.
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Affiliation(s)
- Concepción Palomo
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain; CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Vicente Mas
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain; CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Mónica Vázquez
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain; CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Olga Cano
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain; CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Daniel Luque
- Unidad de Microscopía Electrónica y Confocal, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - María C Terrón
- Unidad de Microscopía Electrónica y Confocal, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Lesley J Calder
- National Institute for Medical Research, MRC, Mill Hill, London NW7 1AA, UK
| | - José A Melero
- Unidad de Biología Viral, Centro Nacional de Microbiología, Madrid, Spain; CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain.
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10
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A conformation-dependent neutralizing monoclonal antibody specifically targeting receptor-binding domain in Middle East respiratory syndrome coronavirus spike protein. J Virol 2014; 88:7045-53. [PMID: 24719424 DOI: 10.1128/jvi.00433-14] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Prophylactic and therapeutic strategies are urgently needed to combat infections caused by the newly emerged Middle East respiratory syndrome coronavirus (MERS-CoV). Here, we have developed a neutralizing monoclonal antibody (MAb), designated Mersmab1, which potently blocks MERS-CoV entry into human cells. Biochemical assays reveal that Mersmab1 specifically binds to the receptor-binding domain (RBD) of the MERS-CoV spike protein and thereby competitively blocks the binding of the RBD to its cellular receptor, dipeptidyl peptidase 4 (DPP4). Furthermore, alanine scanning of the RBD has identified several residues at the DPP4-binding surface that serve as neutralizing epitopes for Mersmab1. These results suggest that if humanized, Mersmab1 could potentially function as a therapeutic antibody for treating and preventing MERS-CoV infections. Additionally, Mersmab1 may facilitate studies of the conformation and antigenicity of MERS-CoV RBD and thus will guide rational design of MERS-CoV subunit vaccines. IMPORTANCE MERS-CoV is spreading in the human population and causing severe respiratory diseases with over 40% fatality. No vaccine is currently available to prevent MERS-CoV infections. Here, we have produced a neutralizing monoclonal antibody with the capacity to effectively block MERS-CoV entry into permissive human cells. If humanized, this antibody may be used as a prophylactic and therapeutic agent against MERS-CoV infections. Specifically, when given to a person (e.g., a patient's family member or a health care worker) either before or after exposure to MERS-CoV, the humanized antibody may prevent or inhibit MERS-CoV infection, thereby stopping the spread of MERS-CoV in humans. This antibody can also serve as a useful tool to guide the design of effective MERS-CoV vaccines.
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11
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Bates JT, Keefer CJ, Slaughter JC, Kulp DW, Schief WR, Crowe JE. Escape from neutralization by the respiratory syncytial virus-specific neutralizing monoclonal antibody palivizumab is driven by changes in on-rate of binding to the fusion protein. Virology 2014; 454-455:139-44. [PMID: 24725940 DOI: 10.1016/j.virol.2014.02.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Revised: 02/09/2014] [Accepted: 02/10/2014] [Indexed: 01/14/2023]
Abstract
The role of binding kinetics in determining neutralizing potency for antiviral antibodies is poorly understood. While it is believed that increased steady-state affinity correlates positively with increased virus-neutralizing activity, the relationship between association or dissociation rate and neutralization potency is unclear. We investigated the effect of naturally-occurring antibody resistance mutations in the RSV F protein on the kinetics of binding to palivizumab. Escape from palivizumab-mediated neutralization of RSV occurred with reduced association rate (Kon) for binding to RSV F protein, while alteration of dissociation rate (Koff) did not significantly affect neutralizing activity. Interestingly, linkage of reduced Kon with reduced potency mirrored the effect of increased Kon found in a high-affinity enhanced potency palivizumab variant (motavizumab). These data suggest that association rate is the dominant factor driving neutralization potency for antibodies to RSV F protein antigenic site A and determines the potency of antibody somatic variants or efficiency of escape of viral glycoprotein variants.
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Affiliation(s)
- John T Bates
- The Vanderbilt Vaccine Center, Departments of Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, United states
| | - Christopher J Keefer
- The Vanderbilt Vaccine Center, Departments of Pediatrics, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, United states
| | - James C Slaughter
- The Vanderbilt Vaccine Center, Departments of Biostatistics and Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, United states
| | - Daniel W Kulp
- IAVI Neutralizing Antibody Center and Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, United states
| | - William R Schief
- IAVI Neutralizing Antibody Center and Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, United states; Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, CA, United states
| | - James E Crowe
- The Vanderbilt Vaccine Center, Departments of Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, United states; The Vanderbilt Vaccine Center, Departments of Pediatrics, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, United states.
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12
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Yang L, Wang P. Passive immunization against HIV/AIDS by antibody gene transfer. Viruses 2014; 6:428-47. [PMID: 24473340 PMCID: PMC3939464 DOI: 10.3390/v6020428] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 01/06/2014] [Accepted: 01/10/2014] [Indexed: 12/12/2022] Open
Abstract
Despite tremendous efforts over the course of many years, the quest for an effective HIV vaccine by the classical method of active immunization remains largely elusive. However, two recent studies in mice and macaques have now demonstrated a new strategy designated as Vectored ImmunoProphylaxis (VIP), which involves passive immunization by viral vector-mediated delivery of genes encoding broadly neutralizing antibodies (bnAbs) for in vivo expression. Robust protection against virus infection was observed in preclinical settings when animals were given VIP to express monoclonal neutralizing antibodies. This unorthodox approach raises new promise for combating the ongoing global HIV pandemic. In this article, we survey the status of antibody gene transfer, review the revolutionary progress on isolation of extremely bnAbs, detail VIP experiments against HIV and its related virus conduced in humanized mice and macaque monkeys, and discuss the pros and cons of VIP and its opportunities and challenges towards clinical applications to control HIV/AIDS endemics.
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Affiliation(s)
- Lili Yang
- Department of Microbiology, Immunology and Molecular Genetics, Eli & Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California at Los Angeles, Los Angeles, CA 90095, USA.
| | - Pin Wang
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA.
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13
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The use of humanized monoclonal antibodies for the prevention of respiratory syncytial virus infection. Clin Dev Immunol 2013; 2013:359683. [PMID: 23840240 PMCID: PMC3693113 DOI: 10.1155/2013/359683] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/13/2013] [Accepted: 05/20/2013] [Indexed: 11/17/2022]
Abstract
Monoclonal antibodies are widely used both in infants and in adults for several indications. Humanized monoclonal antibodies (palivizumab) have been used for many years for the prevention of respiratory syncytial virus infection in pediatric populations (preterm infants, infants with chronic lung disease or congenital heart disease) at high risk of severe and potentially lethal course of the infection. This drug was reported to be safe, well tolerated and effective to decrease the hospitalization rate and mortality in these groups of infants by several clinical trials. In the present paper we report the development and the current use of monoclonal antibodies for prophylaxis against respiratory syncytial virus.
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Bates JT, Keefer CJ, Utley TJ, Correia BE, Schief WR, Crowe JE. Reversion of somatic mutations of the respiratory syncytial virus-specific human monoclonal antibody Fab19 reveal a direct relationship between association rate and neutralizing potency. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2013; 190:3732-9. [PMID: 23455501 PMCID: PMC3608519 DOI: 10.4049/jimmunol.1202964] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The role of affinity in determining neutralizing potency of mAbs directed against viruses is not well understood. We investigated the kinetic, structural, and functional advantage conferred by individual naturally occurring somatic mutations in the Ab H chain V region of Fab19, a well-described neutralizing human mAb directed to respiratory syncytial virus. Comparison of the affinity-matured Ab Fab19 with recombinant Fab19 Abs that were variants containing reverted amino acids from the inferred unmutated ancestor sequence revealed the molecular basis for affinity maturation of this Ab. Enhanced binding was achieved through mutations in the third H chain CDR (HCDR3) that conferred a markedly faster on-rate and a desirable increase in antiviral neutralizing activity. In contrast, most somatic mutations in the HCDR1 and HCDR2 regions did not significantly enhance Ag binding or antiviral activity. We observed a direct relationship between the measured association rate (Kon) for F protein and antiviral activity. Modeling studies of the structure of the Ag-Ab complex suggested the HCDR3 loop interacts with the antigenic site A surface loop of the respiratory syncytial virus F protein, previously shown to contain the epitope for this Ab by experimentation. These studies define a direct relationship of affinity and neutralizing activity for a viral glycoprotein-specific human mAb.
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Affiliation(s)
- John T. Bates
- The Vanderbilt Vaccine Center, Vanderbilt University Medical Center,
Nashville, TN
| | | | - Thomas J. Utley
- Department of Pathology, Microbiology, and Immunology,
Vanderbilt University Medical Center, Nashville, TN
| | - Bruno E. Correia
- Department of Chemical Physiology, The Scripps Research
Institute, La Jolla, CA
| | - William R. Schief
- Department of Immunology and Microbial Science, The Scripps
Research Institute, La Jolla, CA
| | - James E. Crowe
- The Vanderbilt Vaccine Center, Vanderbilt University Medical Center,
Nashville, TN
- Department of Pediatrics, Vanderbilt University Medical
Center, Nashville, TN
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15
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Kusuda S, Takahashi N, Saitoh T, Terai M, Kaneda H, Kato Y, Ohashi A, Watabe S, Joh-o K, Hirai K. Survey of pediatric ward hospitalization due to respiratory syncytial virus infection after the introduction of palivizumab to high-risk infants in Japan. Pediatr Int 2011; 53:368-73. [PMID: 20854284 DOI: 10.1111/j.1442-200x.2010.03249.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Respiratory syncytial virus (RSV) infection is a major cause of hospitalization during the winter among infants and young children. In 2002 palivizumab was introduced to high-risk infants for RSV hospitalization in Japan. It is important to characterize the hospitalized children due to RSV infection after the introduction of palivizumab. METHODS A survey was conducted to collect the data from the hospitalized children at 12 participating hospitals during the winter of 2007. RESULTS From October 2007 through April 2008, 8163 children were admitted to participating hospitals, with RSV infection accounting for 811 of those hospitalizations. Mean age in children with RSV infection at hospitalization was 12.4 ± 12.7 months, and children under 24 months of age accounted for 86.4%. The mean gestational age of those at birth was 38.0 ± 2.6 weeks, with 82.4% of the children born at term. Palivizumab was administered in 24 cases of RSV infection, while there were 28 patients who were not treated with palivizumab, even though they met the indication for palivizumab. Death, in a total of five cases, occurred in children who were not treated with palivizumab. CONCLUSIONS Palivizumab has been widely used in high-risk infants who were covered by health insurance, and most of the hospitalized children with RSV infection in the study hospitals were not treated with palivizumab.
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16
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Pons JMV, Tebé C, Paladio N, Garcia-Altes A, Danés I, Valls-I-Soler A. Meta-analysis of passive immunoprophylaxis in paediatric patients at risk of severe RSV infection. Acta Paediatr 2011; 100:324-9. [PMID: 20950412 DOI: 10.1111/j.1651-2227.2010.02059.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM To review respiratory syncytial virus (RSV), passive immunoprophylaxis (PI) trials and meta-analysis (MA). METHODS A literature review. RESULTS Two MA of PI were found. Overall 3927 patients were randomized. PI reduces RSV hospitalization in patients with bronchopulmonary dysplasia (RR 0.58; 95% CI 0.41, 0.82) and with acyanotic congenital heart disease (RR 0.29; 95% CI 0.14, 0.62). In patients with cyanotic heart disease or premature infants without bronchopulmonary dysplasia, results are inconclusive. Passive immunoprophylaxis has a null effect in mechanical ventilation and death. CONCLUSION Passive immunoprophylaxis reduces RSV hospitalization in a subset of patients. However, it has no effect in harder endpoints of RSV disease severity.
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Affiliation(s)
- J M V Pons
- Agència d'Avaluació de Tecnologia i Recerca Mèdiques (Catalan Agency for Health Technology Assessment and Research), Departament de Salut, Generalitat de Catalunya, Barcelona, Spain.
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17
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Zhu Q, McAuliffe JM, Patel NK, Palmer-Hill FJ, Yang CF, Liang B, Su L, Zhu W, Wachter L, Wilson S, MacGill RS, Krishnan S, McCarthy MP, Losonsky GA, Suzich JA. Analysis of respiratory syncytial virus preclinical and clinical variants resistant to neutralization by monoclonal antibodies palivizumab and/or motavizumab. J Infect Dis 2011; 203:674-82. [PMID: 21208913 PMCID: PMC3072724 DOI: 10.1093/infdis/jiq100] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Accepted: 11/22/2010] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Palivizumab is a US Food and Drug Administration-approved monoclonal antibody for the prevention of respiratory syncytial virus (RSV) lower respiratory disease in high-risk infants. Motavizumab, derived from palivizumab with enhanced antiviral activity, has recently been tested in humans. Although palivizumab escape mutants have been generated in the laboratory, the development of resistant RSV in patients receiving palivizumab has not been reported previously. METHODS We generated palivizumab and motavizumab escape mutants in vitro and examined the development of resistant mutants in RSV-breakthrough patients receiving immunoprophylaxis. The effect of these mutations on neutralization by palivizumab and motavizumab and in vitro fitness was studied. RESULTS Antibody-resistant RSV variants selected in vitro had mutations at position 272 of the fusion protein, from lysine to asparagine, methionine, threonine, glutamine, or glutamate. Variants containing mutations at positions 272 and 275 were detected in breakthrough patients. All these variants were resistant to palivizumab, but only the glutamate variant at position 272 demonstrated resistance to motavizumab. Mixtures of wild-type and variant RSV soon lost the resistant phenotype in the absence of selection. CONCLUSIONS Resistant RSV variants were detected in a small subset (∼ 5%) of RSV breakthrough cases. The fitness of these variants was impaired, compared to wild-type RSV.
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Affiliation(s)
- Qing Zhu
- Department of Infectious Disease-Vaccines, MedImmune, Gaithersburg, Maryland, USA
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18
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Magro M, Andreu D, Gómez-Puertas P, Melero JA, Palomo C. Neutralization of human respiratory syncytial virus infectivity by antibodies and low-molecular-weight compounds targeted against the fusion glycoprotein. J Virol 2010; 84:7970-82. [PMID: 20534864 PMCID: PMC2916552 DOI: 10.1128/jvi.00447-10] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 05/25/2010] [Indexed: 11/20/2022] Open
Abstract
Human respiratory syncytial virus (HRSV) fusion (F) protein is an essential component of the virus envelope that mediates fusion of the viral and cell membranes, and, therefore, it is an attractive target for drug and vaccine development. Our aim was to analyze the neutralizing mechanism of anti-F antibodies in comparison with other low-molecular-weight compounds targeted against the F molecule. It was found that neutralization by anti-F antibodies is related to epitope specificity. Thus, neutralizing and nonneutralizing antibodies could bind equally well to virions and remained bound after ultracentrifugation of the virus, but only the former inhibited virus infectivity. Neutralization by antibodies correlated with inhibition of cell-cell fusion in a syncytium formation assay, but not with inhibition of virus binding to cells. In contrast, a peptide (residues 478 to 516 of F protein [F478-516]) derived from the F protein heptad repeat B (HRB) or the organic compound BMS-433771 did not interfere with virus infectivity if incubated with virus before ultracentrifugation or during adsorption of virus to cells at 4 degrees C. These inhibitors must be present during virus entry to effect HRSV neutralization. These results are best interpreted by asserting that neutralizing antibodies bind to the F protein in virions interfering with its activation for fusion. Binding of nonneutralizing antibodies is not enough to block this step. In contrast, the peptide F478-516 or BMS-433771 must bind to F protein intermediates generated during virus-cell membrane fusion, blocking further development of this process.
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Affiliation(s)
- Margarita Magro
- Laboratorio de Biología Viral, Centro Nacional de Microbiología and CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain, Departamento de Ciencias Experimentales y de la Salud, Universidad Pompeu Fabra, 08003 Barcelona, Spain, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Cantoblanco, 28049 Madrid, Spain, CIBER Fisiopatología de la Obesidad y la Nutrición (CB06/03), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - David Andreu
- Laboratorio de Biología Viral, Centro Nacional de Microbiología and CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain, Departamento de Ciencias Experimentales y de la Salud, Universidad Pompeu Fabra, 08003 Barcelona, Spain, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Cantoblanco, 28049 Madrid, Spain, CIBER Fisiopatología de la Obesidad y la Nutrición (CB06/03), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - Paulino Gómez-Puertas
- Laboratorio de Biología Viral, Centro Nacional de Microbiología and CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain, Departamento de Ciencias Experimentales y de la Salud, Universidad Pompeu Fabra, 08003 Barcelona, Spain, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Cantoblanco, 28049 Madrid, Spain, CIBER Fisiopatología de la Obesidad y la Nutrición (CB06/03), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - José A. Melero
- Laboratorio de Biología Viral, Centro Nacional de Microbiología and CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain, Departamento de Ciencias Experimentales y de la Salud, Universidad Pompeu Fabra, 08003 Barcelona, Spain, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Cantoblanco, 28049 Madrid, Spain, CIBER Fisiopatología de la Obesidad y la Nutrición (CB06/03), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - Concepción Palomo
- Laboratorio de Biología Viral, Centro Nacional de Microbiología and CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain, Departamento de Ciencias Experimentales y de la Salud, Universidad Pompeu Fabra, 08003 Barcelona, Spain, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Cantoblanco, 28049 Madrid, Spain, CIBER Fisiopatología de la Obesidad y la Nutrición (CB06/03), Instituto de Salud Carlos III, 28029, Madrid, Spain
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Wang KC, Chang JS, Chiang LC, Lin CC. 4-Methoxycinnamaldehyde inhibited human respiratory syncytial virus in a human larynx carcinoma cell line. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2009; 16:882-6. [PMID: 19303275 DOI: 10.1016/j.phymed.2009.02.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2008] [Revised: 01/19/2009] [Accepted: 02/10/2009] [Indexed: 05/04/2023]
Abstract
4-Methoxycinnamaldehyde, an active constituent of Agastache rugosa, was examined for its cytoprotective activity against RSV by XTT method in human larynx carcinoma cell line. 4-Methoxycinnamaldehyde could effectively inhibit cytopathic effect of RSV (p<0.0001) with an estimated IC(50) of 0.055microg/ml and a selectivity index (SI) of 898.2. 4-Methoxycinnamaldehyde (0.03microg/ml) could inhibit viral entrance by interfering viral attachment (IC(50) of 0.06microg/ml; p<0.0001) and internalization (IC(50) of 0.01microg/ml; p<0.0001). 4-Methoxycinnamaldehyde significantly increased the basal production of IFN (p=0.0015), but not the virus-induced IFN production. Therefore, its cytoprotective activity against RSV was not mediated by interferon. In conclusion, 4-methoxycinnamaldehyde might be helpful to manage the disease induced by RSV infection.
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Affiliation(s)
- Kuo Chih Wang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
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21
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Skaricic D, Traube C, De B, Joh J, Boyer J, Crystal RG, Worgall S. Genetic delivery of an anti-RSV antibody to protect against pulmonary infection with RSV. Virology 2008; 378:79-85. [PMID: 18556039 DOI: 10.1016/j.virol.2008.04.016] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2008] [Revised: 03/28/2008] [Accepted: 04/08/2008] [Indexed: 11/16/2022]
Abstract
Respiratory syncytial virus (RSV) is a common cause of severe lower respiratory tract infections. Protection against infection with RSV can be achieved by monthly administration of the humanized monoclonal antibody palivizumab. The present study analyzes if genetic delivery of a murine version of palivizumab by single administration would achieve high-level and sustained antibody expression to protect mice against pulmonary infection with RSV. A murine version of the palivizumab antibody was constructed by replacing the human sequences with sequences from the constant region of a murine IgG1 antibody, while preserving the complementarity-determining region. As a proof-of-principle to test the validity of the strategy, the coding sequence for the heavy and light chains were cloned into a replication-defective serotype 5 human adenovirus vector (AdalphaRSV). Antibody expression and specificity for RSV was confirmed by Western analysis. To determine if AdalphaRSV would mediate production of anti-RSV antibodies in vivo, 5x10(10) particle units of AdalphaRSV or a control vector without transgene (AdNull), were administered intravenously to BALB/c mice. RSV neutralizing antibodies were detected in the serum after 4 days in mice receiving AdalphaRSV but not in AdNull-infected or naive mice (p<0.05). The mice that had received AdalphaRSV had at least 5.4-fold lower RSV titers in the lung 4 days following intranasal challenge with RSV compared to the AdNull or naive group (p<0.01). To evaluate long-term protection, the antibody construct was expressed in a non-human primate serotype rh.10 adeno-associated virus vector (AAVrh.10alphaRSV). RSV neutralizing antibodies were detected in serum and bronchoalveolar lavage fluid for up to 21 wk following intrapleural administration of AAVrh.10alphaRSV, but not with a control AAV vector expressing an unrelated transgene (AAVrh.10alpha1AT). Following challenge with RSV at 7 or 21 wk, 14.3-fold and 10.6-fold lower RSV titers were observed after 4 days in the lungs of mice that had received AAVrh.10alphaRSV compared to AAVrh.10alpha1AT (p<0.05). Together these data demonstrate that a gene transfer strategy for delivery of an anti-RSV antibody can generate protective immunity in mice against RSV infection in the respiratory tract and may provide an alternative to the administration of the antibody itself.
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Affiliation(s)
- Davor Skaricic
- Department of Pediatrics, Weill Medical College of Cornell University, New York, New York 10065, USA
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22
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Sampalis JS, Langley J, Carbonell-Estrany X, Paes B, O'Brien K, Allen U, Mitchell I, Aloy JF, Pedraz C, Michaliszyn AF. Development and Validation of a Risk Scoring Tool to Predict Respiratory Syncytial Virus Hospitalization in Premature Infants Born at 33 through 35 Completed Weeks of Gestation. Med Decis Making 2008; 28:471-80. [DOI: 10.1177/0272989x08315238] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective. The purpose of the study was to develop and validate a clinical instrument predicting the risk of respiratory syncytial virus (RSV)-associated hospitalization (RSV-H) in premature infants born at 33 through 35 completed weeks of gestation (33— 35GA). Design. An RSV risk scoring tool (RSV-RS) was developed by entering risk factors for RSV-H, determined in a Canadian prospective study, into a multiple logistic regression model. The scoring tool was then validated externally with data from a Spanish case-control study (FLIP). The Canadian cohort comprised 1758 RSV-positive infants born 33— 35GA, of whom 66 (3.7%) had confirmed RSV-H. The FLIP data set comprised 186 (33.4%) RSV-H cases and 371 (66.7%) controls. Method. The primary outcome measure was RSV-H. The RSV-RS score was the sum of the weighted probabilities for each included risk factor multiplied by 100 and ranged from 0 to 100. Receiver operator characteristic curve analyses determined cutoff points to predict subjects at low, moderate, or high RSV-H risk. Results. The RSV-RS included 7 risk factors and cutoff scores of 0— 48, 49— 64, and 65— 100 for low-, moderate-, and high-risk subjects, respectively. For the Canadian cohort, RSV-RS sensitivity in predicting RSV-H cases was 68.2%, with 71.9% specificity. With the FLIP data set, the RSV-RS had lower accuracy (61.3% sensitivity; 65.8% specificity) but showed significant positive association with increased risk for RSV-H. Conclusion. The RSV-RS accurately identified 33— 35GA infants at increased risk for RSV-H in a Canadian cohort. External validation with Spanish case-control study data further confirmed that the scoring tool is appropriate for the estimation of RSV-H risk.
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Affiliation(s)
- John S. Sampalis
- Department of Surgery and Medicine, McGill University and JSS Medical Research Inc., Montreal, Quebec, Canada
| | - Joanne Langley
- Departments of Pediatrics and Community Health and Epidemiology, Dalhousie University and the IWK Health Centre, Halifax, Nova Scotia, Canada
| | - Xavier Carbonell-Estrany
- Neonatology Service, Hospital Clinic, Institut Clinic Ginecologia Obstetricia i Neonatologia, Universidad de Barcelona, Barcelona, Spain
| | - Bosco Paes
- Division of Neonatology, Department of Pediatrics, McMaster Children's Hospital, Hamilton, Ontario, Canada
| | - Karel O'Brien
- Department of Pediatrics, University of Toronto and Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Upton Allen
- Division of Infectious Diseases, Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Ian Mitchell
- Department of Pediatrics, Alberta's Children's Hospital and University of Calgary, Calgary, Alberta, Canada
| | - José Figueras Aloy
- Neonatology Service, Hospital Clinic, Institut Clinic Ginecologia Obstetricia i Neonatologia, Universidad de Barcelona, Barcelona, Spain
| | - Carmen Pedraz
- Neonatology Service, Hospital Clinico, Salamanca, Spain
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Affinity purification of IgG monoclonal antibodies using the D-PAM synthetic ligand: chromatographic comparison with protein A and thermodynamic investigation of the D-PAM/IgG interaction. J Immunol Methods 2008; 333:126-38. [DOI: 10.1016/j.jim.2008.01.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Revised: 01/18/2008] [Accepted: 01/23/2008] [Indexed: 11/18/2022]
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Wu H, Pfarr DS, Losonsky GA, Kiener PA. Immunoprophylaxis of RSV infection: advancing from RSV-IGIV to palivizumab and motavizumab. Curr Top Microbiol Immunol 2007; 317:103-23. [PMID: 17990791 DOI: 10.1007/978-3-540-72146-8_4] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Antibodies mediate humoral immune responses and play key roles in the defense of viral infection by the recognition, neutralization, and elimination of viruses from the circulation. For the prevention of respiratory syncytial virus (RSV) infection, the natural immune response to RSV from pooled human plasma has been harvested and successfully developed as a prophylactic polyclonal RSV hyperimmune globulin, RespiGam (RSV-IGIV; MedImmune, Gaithersburg, MD). The success of RSV-IGIV validated the immunoprophylaxis approach for RSV prevention and led to the development of Synagis (palivizumab; MedImmune, Gaithersburg, MD), a humanized monoclonal antibody (mAb) that binds to the RSV F protein. Palivizumab is a potent anti-RSV mAb that is about 50-fold more potent than RSV-IGIV, and since obtaining regulatory approval in 1998 it has been used extensively to help prevent severe RSV disease in high-risk infants and children. However, a very small number of patients receiving the drug do not appear to be adequately protected. To further improve protection against RSV, we have applied a directed evolution approach to enhance the binding of palivizumab to F protein by manipulation of both the on and off rates. These efforts have yielded a more potent second-generation mAb, motavizumab, which is currently under study in phase III clinical trials. Most recently, a third generation mAb, Numax-YTE, has been generated with the intent to extend the serum half-life of the mAb in humans. If successfully developed, this drug may offer the opportunity for less frequent dosing, obviating the need for the monthly treatments that are required with palivizumab. The development of these anti-RSV approaches exemplifies the accelerated pace of drug development made possible with cutting-edge antibody engineering technologies.
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Affiliation(s)
- H Wu
- MedImmune, Inc., One MedImmune Way, Gaithersburg, MD 20878, USA.
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25
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Feltes TF, Sondheimer HM. Palivizumab and the prevention of respiratory syncytial virus illness in pediatric patients with congenital heart disease. Expert Opin Biol Ther 2007; 7:1471-80. [PMID: 17727335 DOI: 10.1517/14712598.7.9.1471] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Respiratory syncytial virus (RSV) is a significant pathogen for infants and children with congenital heart disease. Non-sustained immunity and failure to develop an effective vaccine has steered RSV management toward a passive immunotherapy strategy in at-risk children. Palivizumab is a humanized murine monoclonal antibody targeting the RSV envelope F glycoprotein. In a Phase III clinical trial palivizumab significantly reduced RSV hospitalization in children with significant congenital heart disease and was proven to be safe. Palivizumab is one of the first monoclonal antibodies to significantly impact a pediatric disease.
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Affiliation(s)
- Timothy F Feltes
- The Ohio State University, Columbus Children's Hospital, 700 Children's Drive, ED 617, Columbus, Ohio 43205, USA.
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Abstract
This article explores the home health nurse's role in preventing respiratory syncytial virus (RSV) among premature infants. Thousands of children infected with RSV require hospitalization each year. Consistent contact with the infant alerts the nurse to subtle signs and symptoms of RSV infection, which may include nasal congestion, cough, low-grade fever, and malaise. By developing patient and caregiver trust, the home health nurse can implement an RSV prevention plan, leading to a decrease in hospitalization episodes of premature infants with RSV. Identification of patient risk factors contributing to RSV together with caregiver education is addressed in this article.
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Sloan SE, Hanlon C, Weldon W, Niezgoda M, Blanton J, Self J, Rowley KJ, Mandell RB, Babcock GJ, Thomas WD, Rupprecht CE, Ambrosino DM. Identification and characterization of a human monoclonal antibody that potently neutralizes a broad panel of rabies virus isolates. Vaccine 2006; 25:2800-10. [PMID: 17240489 DOI: 10.1016/j.vaccine.2006.12.031] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Accepted: 12/13/2006] [Indexed: 12/25/2022]
Abstract
Rabies is a zoonosis that results in millions of human exposures worldwide each year. Human monoclonal antibodies (HuMAbs) that neutralize rabies virus may represent one viable strategy for post-exposure prophylaxis in humans, and have many advantages over current human or equine rabies immune globulin. Transgenic mice carrying human immunoglobulin genes were used to isolate human monoclonal antibodies that neutralized rabies virus. Several HuMAbs were identified that neutralized rabies virus variants from a broad panel of isolates of public health significance. HuMAb 17C7 was the most promising antibody identified because it neutralized all rabies virus isolates tested. HuMAb 17C7 recognizes a conformational epitope on the rabies virus glycoprotein which includes antigenic site III. HuMAb 17C7 protected hamsters from a lethal dose of rabies virus in a well-established in vivo model of post-exposure prophylaxis.
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Affiliation(s)
- Susan E Sloan
- Massachusetts Biologic Laboratories, University of Massachusetts Medical School, 305 South Street, Jamaica Plain, MA 02130, United States
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28
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Kusuda S, Koizumi T, Sakai T, Fujimura M, Nishida H, Togari H. Results of clinical surveillance during the Japanese first palivizumab season in 2002-2003. Pediatr Int 2006; 48:362-8. [PMID: 16911080 DOI: 10.1111/j.1442-200x.2006.02222.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND In Japan, palivizumab was approved in 2002 for prophylaxis of severe respiratory syncytial virus disease in high-risk infants. In order to evaluate the efficacy and safety of this drug, a questionnaire survey was conducted. METHODS A questionnaire was sent to member institutions of the Japan Neonatologist Association. The subjects were premature infants who were considered possible candidates for treatment with palivizumab. RESULTS A total of 6302 case reports, including those of 2806 infants receiving palivizumab (group P) and 3496 infants not receiving palivizumab (group NP), respectively, were retrieved. Background characteristics revealed significant lower gestational age (GA) and birthweight for group P (P < 0.0001). Sex ratio did not differ significantly, while use of oxygen and mechanical ventilation in the neonatal intensive care unit, and presence of chronic lung disease were significantly higher for infants in group P (P < 0.0001). When comparison of hospitalization rate for respiratory symptoms was performed with stratification by eligibility criteria, in the group of infants born at 29-35 weeks GA the hospitalization rate was 4.0% and 5.7% in groups P and NP, respectively (P < 0.05). Multivariate analysis also showed that prophylaxis with palivizumab was the only variable that significantly decreased rate of hospitalization (odds ratio 0.630, P= 0.0053). The incidence of adverse events associated with the administration of palivizumab was low. CONCLUSION In this non-randomized questionnaire survey, multivariate analysis showed that palivizumab significantly decreased the rate of hospitalization due to respiratory symptoms for infants born prematurely at 29-35 weeks GA. These data confirmed the efficacy and safety of palivizumab.
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Affiliation(s)
- Satoshi Kusuda
- Japan Neonatologist Association, Japan Society for Premature and Newborn Medicine, Osaka, Nagoya, Japan.
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Abstract
Nanobodies are the smallest fragments of naturally occurring heavy-chain antibodies that have evolved to be fully functional in the absence of a light chain. As such, the cloning and selection of antigen-specific nanobodies obviate the need for construction and screening of large libraries, and for lengthy and unpredictable in vitro affinity maturation steps. The unique and well-characterised properties enable nanobodies to excel conventional therapeutic antibodies in terms of recognising uncommon or hidden epitopes, binding into cavities or active sites of protein targets, tailoring of half-life, drug format flexibility, low immunogenic potential and ease of manufacture. Moreover, the favourable biophysical and pharmacological properties of nanobodies, together with the ease of formatting them into multifunctional protein therapeutics, leaves them ideally placed as a new generation of antibody-based therapeutics. This review describes the state of the art on nanobodies and illustrates their potential as cancer therapeutic agents.
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Affiliation(s)
- Hilde Revets
- Vrije Universiteit Brussel, Department of Molecular and Cellular Interactions, Laboratory of Cellular and Molecular Immunology, Vlaams Interuniversitair Instituut voor Biotechnologie, Pleinlaan 2, Building E8, B-1050 Brussels, Belgium.
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30
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Melero JA. Molecular Biology of Human Respiratory Syncytial Virus. RESPIRATORY SYNCYTIAL VIRUS 2006. [DOI: 10.1016/s0168-7069(06)14001-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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31
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Li Y, But PPH, Ooi VEC. Antiviral activity and mode of action of caffeoylquinic acids from Schefflera heptaphylla (L.) Frodin. Antiviral Res 2005; 68:1-9. [PMID: 16140400 DOI: 10.1016/j.antiviral.2005.06.004] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Revised: 06/13/2005] [Accepted: 06/13/2005] [Indexed: 11/22/2022]
Abstract
Schefflera heptaphylla is a popular medicinal plant in southern China. Three caffeoylquinic acid derivatives, namely 3,4-di-O-caffeoylquinic acid, 3,5-di-O-caffeoylquinic acid, and 3-O-caffeoylquinic acid, were isolated from this plant and investigated for their antiviral activity against respiratory syncytial virus (RSV). 3,4-Di-O-caffeoylquinic acid and 3,5-di-O-caffeoylquinic acid possessed potent anti-RSV activity. The median inhibitory concentrations (IC50) of 3,4-di-O-caffeoylquinic acid and 3,5-di-O-caffeoylquinic acid against RSV were 2.33 microM (1.2 microg/ml) and 1.16 microM (0.6 microg/ml), respectively, in a plaque reduction assay. The dicaffeoylquinic acids exhibited minimal cytotoxicity against HEp-2 cells with median cytotoxic concentration (CC50) higher than 1000 microM. The maximal non-cytotoxic concentration (MNCC) of the two dicaffeoylquinic acids were about 96.7 microM, which suggested their anti-RSV effect was not due to cytotoxicity. The antiviral action of 3,4-di-O-caffeoylquinic acid and 3,5-di-O-caffeoylquinic acid was specific against RSV, as they had no obvious antiviral activity against influenza A (Flu A), Coxsackie B3 (Cox B3), and Herpes simplex type one (HSV-1) viruses. Studies were performed that indicated that the dicaffeoylquinic acids could inhibit RSV directly, extracellularly, but only at much higher concentrations than seen in standard assays. Moreover, they could not inhibit RSV attachment to host cells, and could not protect HEp-2 cells from RSV infection at lower concentrations. The data suggest that the compounds exerted their anti-RSV effects via the inhibition of virus-cell fusion in the early stage, and the inhibition of cell-cell fusion at the end of the RSV replication cycle.
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Affiliation(s)
- Yaolan Li
- Department of Chemistry, Jinan University, Guangzhou, China
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Abstract
BACKGROUND Infants with congenital heart diseases (CHD) are at high risk for Respiratory syncytial virus (RSV) infection, which causes severe respiratory distress. Palivizumab, an anti-RSV monoclonal antibody, was licensed in the USA, Europe and Canada, and a large-scale placebo-controlled double-blind test in these countries confirmed its efficacy and safety. A survey using questionnaires to assess usage, prophylactic efficacy, and safety of palivizumab in Japanese infants and young children with CHD was conducted. METHODS The survey was conducted between October 2002 and March 2003. The questionnaire asked for patients' characteristics, presence of CHD, underlying diseases, starting date and number of injection, adverse events, correlation between adverse events and treatment with palivizumab, and evaluation of efficacy. RESULTS In total, 108 infants were reported from 61 institutions. A total of 60 of the 108 infants evaluated without major non-cardiac complications received intramuscular injection of 15 mg/kg per month of palivizumab in a manner not consistent with approved indications for this drug. A total of 43 cases (39.8%) had complexed CHD, while 64 cases (59.3%) had the first injection in October or November. The average number of injections was 3.0 +/- 1.4. Seven children (6.5%) had notable respiratory infections confirmed by positive test for RSV antigen, and five (4.6%) were hospitalized. No children died nor received mechanical ventilation. The number of adverse events was nine in five cases. There was no significant relationship between adverse events and treatment with palivizumab. CONCLUSION Palivizumab is well-tolerated, fairly effective and safe in preventing severe RSV infection in infants and young children with CHD.
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Affiliation(s)
- Tsutomu Saji
- The First Department of Pediatrics, Toho University School of Medicine, Tokyo, Japan.
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33
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Tulloh RMR, Feltes TF. The European Forum for Clinical Management: prophylaxis against the respiratory syncytial virus in infants and young children with congenital cardiac disease. Cardiol Young 2005; 15:274-8. [PMID: 15865829 DOI: 10.1017/s1047951105000569] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A recent, randomised, double-blind, placebo-controlled trial has demonstrated the effectiveness of palivizumab (Synagis) for prophylaxis against infection by the respiratory syncytial virus in 1,287 young children with congenital cardiac disease. Guidelines for the use of palivizumab in these children considered to be at high risk were published by the American Academy of Pediatrics, followed by similar guidelines from the British Paediatric Cardiac Association, and recommendations from a number of other individual countries, including Canada, Germany, Spain, and France. In May, 2004, further discussion was held between a group of 15 paediatric cardiologists at a European forum for clinical management held in Munich, Germany. The objective of this forum was to define optimal recommendations on prevention of infection by the respiratory syncytial virus in infants and young children with congenital cardiac disease, appropriate to the clinical needs and style of those practising in paediatrics in individual countries. Participants were invited because of their knowledge of the therapeutic area, and for their experience of using palivizumab for prophylaxis against the respiratory syncytial virus in children with congenitally malformed hearts. Measures to educate the carers of children with such congenital malformations on precautions against infection by the respiratory syncytial virus were discussed, along with the many different aspects of best practice for therapeutic prophylaxis with palivizumab. The most appropriate timing of prophylaxis, recommendations for which children are most likely to benefit from prophylaxis, and suggested protocols were among the issues covered. The recommendations resulting from the discussions are presented in this paper, as a step towards reaching consensus.
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Affiliation(s)
- Robert M R Tulloh
- Department of Paediatric Cardiology, Bristol Royal Hospital for Children, Bristol, United Kingdom.
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McGill A, Greensill J, Marsh R, Craft AW, Toms GL. Detection of human respiratory syncytial virus genotype specific antibody responses in infants. J Med Virol 2004; 74:492-8. [PMID: 15368511 DOI: 10.1002/jmv.20203] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Infection and reinfection of infants with human respiratory syncytial virus (HRSV) occur despite the presence of serum anti-viral glycoprotein antibodies similar to those, which afford protection in animal models of infection. Antigenic variation of the viral glycoproteins between different genotypes of the virus which co-circulate in the population may contribute to the ability of the virus to escape from antibody-mediated protection. In this study, we have investigated whether human infants infected with HRSV produced antibody responses recognising the antigenic differences between different contemporary genotypes of virus. Acute and convalescent sera from 26 infants were analysed for antibody responses to the glycoproteins of the virus isolated from their respiratory tract and to representative viruses of homologous and heterologous genotypes. All infants developed antibodies with similar reactivity for viruses of all contemporary isolates and genotypes when measured in an immunofluorescence assay against unfixed virus infected cells. However, when antibody responses to the individual glycoproteins were measured in a surace plasmon resonance (SPR) assay, although all infants developed genotype cross-reactive antibodies to the F glycoprotein, anti-G antibodies were detectable in only half of the infants and in all cases these were genotype specific. Possession of no or only genotype specific antibodies to the G glycoprotein may contribute to the susceptibility of infants to reinfection. In both assays, reactivity of anti-glycoprotein antibodies with the sub-group A archetypal strain, A2, was markedly lower than with any contemporary virus tested indicating that this strain alone is unsuitable for accurate assessment of infant antibody responses. .
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Affiliation(s)
- A McGill
- School of Clinical Medical Sciences, The Medical School, Newcastle upon Tyne, United Kingdom
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Mason SW, Lawetz C, Gaudette Y, Dô F, Scouten E, Lagacé L, Simoneau B, Liuzzi M. Polyadenylation-dependent screening assay for respiratory syncytial virus RNA transcriptase activity and identification of an inhibitor. Nucleic Acids Res 2004; 32:4758-67. [PMID: 15356293 PMCID: PMC519107 DOI: 10.1093/nar/gkh809] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
RNA-dependent RNA polymerase from respiratory syncytial virus (RSV) is a multi-subunit ribonucleoprotein (RNP) complex that, in addition to synthesizing the full 15 222 nt viral genomic RNA, is able to synthesize all 10 viral mRNAs. We have prepared crude RNP from RSV-infected HEp-2 cells, based on a method previously used for Newcastle disease virus, and established a novel polyadenylation-dependent capture [poly(A) capture] assay to screen for potential inhibitors of RSV transcriptase activity. In this homogeneous assay, radiolabeled full-length polyadenylated mRNAs produced by the viral RNP are detected through capture on immobilized biotinylated oligo(dT) in a 96-well streptavidin-coated FlashPlate. Possible inhibitors identified with this assay could interfere at any step required for the production of complete RSV mRNAs, including transcription, polyadenylation and, potentially, co-transcriptional guanylylation. A specific inhibitor of RSV transcriptase with antiviral activity was identified through screening of this assay.
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Affiliation(s)
- Stephen W Mason
- Department of Biological Sciences, Boehringer Ingelheim (Canada) Ltd, Laval, Québec H7S 2G5, Canada.
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36
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Elliott MB, Pryharski KS, Yu Q, Parks CL, Laughlin TS, Gupta CK, Lerch RA, Randolph VB, LaPierre NA, Dack KMH, Hancock GE. Recombinant respiratory syncytial viruses lacking the C-terminal third of the attachment (G) protein are immunogenic and attenuated in vivo and in vitro. J Virol 2004; 78:5773-83. [PMID: 15140975 PMCID: PMC415824 DOI: 10.1128/jvi.78.11.5773-5783.2004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The design of attenuated vaccines for respiratory syncytial virus (RSV) historically focused on viruses made sensitive to physiologic temperature through point mutations in the genome. These prototype vaccines were not suitable for human infants primarily because of insufficient attenuation, genetic instability, and reversion to a less-attenuated phenotype. We therefore sought to construct novel attenuated viruses with less potential for reversion through genetic alteration of the attachment G protein. Complete deletion of G protein was previously shown to result in RSV strains overly attenuated for replication in mice. Using reverse genetics, recombinant RSV (rRSV) strains were engineered with truncations at amino acid 118, 174, 193, or 213 and respectively designated rA2cpDeltaG118, rA2cpDeltaG174, rA2cpDeltaG193, and rA2cpDeltaG213. All rA2cpDeltaG strains were attenuated for growth in vitro and in the respiratory tracts of BALB/c mice but not restricted for growth at 37 degrees C. The mutations did not significantly affect nascent genome synthesis in human lung epithelial (A549) cells, but infectious rA2cpDeltaG virus shed into the culture medium was dramatically diminished. Hence, the data suggested that a site within the C-terminal 85 amino acids of G protein is important for efficient genome packaging or budding of RSV from the infected cell. Vaccination with the rA2cpDeltaG strains also generated efficacious immune responses in mice that were similar to those elicited by the temperature-sensitive cpts248/404 strain previously tested in human infants. Collectively, the data indicate that the rA2cpDeltaG strains are immunogenic, not likely to revert to the less-attenuated phenotype, and thus candidates for further development as vaccines against RSV.
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Affiliation(s)
- Matthew B Elliott
- Wyeth Vaccines Research, 401 N. Middletown Rd., Pearl River, NY 10965, USA
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Easton AJ, Domachowske JB, Rosenberg HF. Animal pneumoviruses: molecular genetics and pathogenesis. Clin Microbiol Rev 2004; 17:390-412. [PMID: 15084507 PMCID: PMC387412 DOI: 10.1128/cmr.17.2.390-412.2004] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pneumoviruses are single-stranded, negative-sense, nonsegmented RNA viruses of the family Paramyxoviridae, subfamily Pneumovirinae, and include pathogens that infect humans (respiratory syncytial virus and human metapneumovirus), domestic mammals (bovine, ovine, and caprine respiratory syncytial viruses), rodents (pneumonia virus of mice), and birds (avian metapneumovirus). Among the topics considered in this review are recent studies focused on the roles of the individual virus-encoded components in promoting virus replication as well as in altering and evading innate antiviral host defenses. Advances in the molecular technology of pneumoviruses and the emergence of recombinant pneumoviruses that are leading to improved virus-based vaccine formulations are also discussed. Since pneumovirus infection in natural hosts is associated with a profound inflammatory response that persists despite adequate antiviral therapy, we also review the recent experimental treatment strategies that have focused on combined antiviral, anti-inflammatory, and immunomodulatory approaches.
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Zhao X, Chen FP, Sullender WM. Respiratory syncytial virus escape mutant derived in vitro resists palivizumab prophylaxis in cotton rats. Virology 2004; 318:608-12. [PMID: 14972528 DOI: 10.1016/j.virol.2003.10.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2003] [Revised: 10/09/2003] [Accepted: 10/17/2003] [Indexed: 11/29/2022]
Abstract
Palivizumab (PZ) is the only monoclonal antibody in human use against an infectious disease. PZ is a humanized monoclonal antibody that recognizes the fusion protein of respiratory syncytial virus (RSV). PZ prophylaxis reduces the likelihood of hospitalization for young children at risk for severe RSV infections. The quasispecies nature of RNA viruses allows rapid emergence of viruses with a selective advantage. A PZ resistant virus was selected by passage of RSV in the presence of PZ in cell culture. The cell culture-derived virus was completely resistant to PZ prophylaxis in cotton rats. The increasing use of PZ, and in particular, the use of PZ in immunosuppressed patients, provide opportunities for resistant viruses to emerge. Whether such viruses will appear and be of clinical significance for humans is unknown. Preclinical studies in cotton rats predicted the efficacy of PZ in humans; these results suggest that if PZ resistant viruses arise in humans, PZ prophylaxis may be ineffective.
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Affiliation(s)
- Xiaodong Zhao
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35233, USA
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Singleton R, Etchart N, Hou S, Hyland L. Inability to evoke a long-lasting protective immune response to respiratory syncytial virus infection in mice correlates with ineffective nasal antibody responses. J Virol 2003; 77:11303-11. [PMID: 14557616 PMCID: PMC229280 DOI: 10.1128/jvi.77.21.11303-11311.2003] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Long-lasting protective antibody is not normally generated in children following primary respiratory syncytial virus (RSV) infection, frequently leading to reinfection. We used the BALB/c mouse model to examine the role of the nasal-associated lymphoid tissue and the bone marrow in the generation of RSV-specific long-lasting plasma cells, with a view to further understanding the mechanisms responsible for the poorly sustained RSV antibody levels following primary infection. We show here that substantial numbers of RSV-specific plasma cells were generated in the bone marrow following challenge, which were maintained thereafter. In contrast, in the nasal-associated lymphoid tissue, RSV-specific plasma cell numbers waned quickly both after primary infection and after challenge and were not maintained at a higher level after boosting. These data indicate that the inability to generate a robust local mucosal response in the nasal tissues may contribute substantially to the likelihood of subsequent reinfection and that the presence of serum anti-RSV antibody without local protection is not enough to protect against reinfection.
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Affiliation(s)
- Richard Singleton
- Edward Jenner Institute for Vaccine Research, Compton, Newbury, Berkshire RG20 7NN, United Kingdom
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Sales V, Wang EEL. Respiratory syncytial virus vaccine: Is it coming? Paediatr Child Health 2003; 8:605-8. [PMID: 20019850 PMCID: PMC2795278 DOI: 10.1093/pch/8.10.605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2024] Open
Abstract
Respiratory syncytial virus (RSV) is recognized as an important cause of childhood morbidity and mortality. Vaccine development has been challenging in young infants and has required the advent of molecular technologies to optimize the safety profile, while maintaining immunogenicity of live-attenuated vaccines. Protein-based vaccines have been evaluated in clinical trials and are promising candidates for RSV-primed populations or for maternal vaccination to provide early life protection. This review provides a summary of the need for an RSV vaccine, as well as the challenges and progress in the vaccine's development.
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Affiliation(s)
- Valérie Sales
- Clinical Development, Aventis Pasteur Ltd, Toronto, Ontario
| | - Elaine EL Wang
- Clinical Development, Aventis Pasteur Ltd, Toronto, Ontario
- Department of Pediatrics, University of Toronto, Toronto, Ontario
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Holman RC, Shay DK, Curns AT, Lingappa JR, Anderson LJ. Risk factors for bronchiolitis-associated deaths among infants in the United States. Pediatr Infect Dis J 2003; 22:483-90. [PMID: 12799502 DOI: 10.1097/01.inf.0000069765.43405.3b] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Risk factors for bronchiolitis deaths have not been described on a national level. We examined the epidemiology of and identified risk factors for bronchiolitis-associated deaths among infants in the United States. METHODS Multiple cause-of-death and linked birth/infant death data for 1996 through 1998 were used to examine bronchiolitis-associated infant deaths. Risk factors were assessed by comparing infants who died with bronchiolitis and surviving infants. RESULTS During 1996 through 1998 there were 229 bronchiolitis infant deaths, resulting in an average annual infant mortality rate of 2.0 per 100 000 live births. The majority (55%) of infant deaths occurred among infants ages 1 through 3 months. The bronchiolitis mortality rate was highest among infants weighing <1500 g at birth (VLBW) as compared with infants weighing 1500 to 2499 g (LBW) and > or =2500 g at birth (29.8, 6.4 and 1.3 per 100 000 live births, respectively). Sixty-three percent of bronchiolitis deaths were among infants weighing > or =2500 g. VLBW and LBW infants remained at an increased risk of dying with bronchiolitis after controlling for other risk factors. Other risk factors included increasing birth order, low 5-min Apgar score, young maternal age, unmarried mother and tobacco use during pregnancy. CONCLUSIONS VLBW and LBW infants are at increased risk of dying with bronchiolitis, even when taking into account other risk factors. Although infants weighing <2500 g at birth are at increased risk for dying with bronchiolitis, the majority of bronchiolitis deaths occur among infants of normal birth weight.
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Affiliation(s)
- Robert C Holman
- Respiratory and Enteric Viruses Branch, Division of Viral and Ricksettial Diseases, National Center for Infectious Diseases, Center for Disease Control and Prevention/DHHS, Atlanta, GA 30333, USA
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Brekke OH, Sandlie I. Therapeutic antibodies for human diseases at the dawn of the twenty-first century. Nat Rev Drug Discov 2003; 2:52-62. [PMID: 12509759 DOI: 10.1038/nrd984] [Citation(s) in RCA: 551] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Antibodies are highly specific, naturally evolved molecules that recognize and eliminate pathogenic and disease antigens. The past 30 years of antibody research have hinted at the promise of new versatile therapeutic agents to fight cancer, autoimmune diseases and infection. Technology development and the testing of new generations of antibody reagents have altered our view of how they might be used for prophylactic and therapeutic purposes. The therapeutic antibodies of today are genetically engineered molecules that are designed to ensure high specificity and functionality. Some antibodies are loaded with toxic modules, whereas others are designed to function naturally, depending on the therapeutic application. In this review, we discuss various aspects of antibodies that are relevant to their use as as therapeutic agents.
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Torrence PF, Powell LD. The quest for an efficacious antiviral for respiratory syncytial virus. Antivir Chem Chemother 2002; 13:325-44. [PMID: 12718405 DOI: 10.1177/095632020201300601] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Respiratory syncytial virus (RSV) continues as an emerging infectious disease not only among infants and children, but also for the immune-suppressed, hospitalized and the elderly. To date, ribavirin (Virazole) remains the only therapeutic agent approved for the treatment of RSV. The prophylactic administration of palivizumab is problematic and costly. The quest for an efficacious RSV antiviral has produced a greater understanding of the viral fusion process, a new hypothesis for the mechanism of action of ribavirin, and a promising antisense strategy combining the 2'-5' oligoadenylate antisense (2-5A-antisense) approach and RSV genomics.
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Affiliation(s)
- Paul F Torrence
- Department of Chemistry, Northern Arizona University, Flagstaff, Ariz., USA.
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Pollack P, Groothuis JR. Development and use of palivizumab (Synagis): a passive immunoprophylactic agent for RSV. J Infect Chemother 2002; 8:201-6. [PMID: 12373481 DOI: 10.1007/s10156-002-0178-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Palivizumab (Synagis; Abbott Laboratories), a humanized, monoclonal antibody, prevents lower respiratory tract infection by respiratory syncytial virus (RSV). RSV causes significant morbidity and mortality in young children worldwide and is particularly severe in pre-term infants, children with cardiopulmonary disease, and the immunosuppressed population. The first such genetically engineered agent to be used effectively against a human infectious disease, palivizumab significantly reduces the number of hospitalizations caused by RSV in high-risk infants. This article reviews the preclinical development and clinical experience of palivizumab.
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Affiliation(s)
- Paul Pollack
- Global Research and Development, Abbott Laboratories, Abbott Park, IL, USA
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