title: Motavizumab, a neutralizing anti-Respiratory Syncytial Virus (Rsv) monoclonal antibody significantly modifies the local and systemic cytokine responses induced by Rsv in the mouse model.
abstract: Motavizumab (MEDI-524) is a monoclonal antibody with enhanced neutralizing activity against RSV. In mice, motavizumab suppressed RSV replication which resulted in significant reduction of clinical parameters of disease severity. We evaluated the effect of motavizumab on the local and systemic immune response induced by RSV in the mouse model. Balb/c mice were intranasally inoculated with 106.5 PFU RSV A2 or medium. Motavizumab was given once intraperitoneally (1.25 mg/mouse) as prophylaxis, 24 h before virus inoculation. Bronchoalveolar lavage (BAL) and serum samples were obtained at days 1, 5 (acute) and 28 (long-term) post inoculation and analyzed with a multiplex assay (Beadlyte Upstate, NY) for simultaneous quantitation of 18 cytokines: IL-1alpha, IL-1beta, IL-2, IL-3, IL-4, IL-5, IL-6, KC (similar to human IL-8), IL-10, IL-12p40, IL-12p70, IL-13, IL-17, TNF-alpha, MCP-1, RANTES, IFN-gamma and GM-CSF. Overall, cytokine concentrations were lower in serum than in BAL samples. By day 28, only KC was detected in BAL specimens at low concentrations in all groups. Administration of motavizumab significantly reduced (p < 0.05) BAL concentrations of IL-1alpha, IL-12p70 and TNF-alpha on day 1, and concentrations of IFN-gamma on days 1 and 5 compared with RSV-infected untreated controls. In the systemic compartment, the concentrations of IL-10, IFN-gamma and KC were significantly reduced in the motavizumab-treated mice compared with the untreated controls. In summary, prophylactic administration of motavizumab was associated with significant reductions on RSV replication and concentrations of cytokine and chemokines, which are likely related to the improvement observed in clinical markers of disease severity.
authors.affiliation: Department of Pediatrics, Division of Pediatric Infectious Diseases, University of Texas Southwestern Medical Center at Dallas, Texas, USA. asuncion.mejias@utsouthwestern.edu
authors.forename: Asunción
authors.initials: A
authors.lastname: Mejías
authors.forename: Susana
authors.initials: S
authors.lastname: Chávez-Bueno
authors.forename: Martin B
authors.initials: MB
authors.lastname: Raynor
authors.forename: John
authors.initials: J
authors.lastname: Connolly
authors.forename: Peter A
authors.initials: PA
authors.lastname: Kiener
authors.forename: Hasan S
authors.initials: HS
authors.lastname: Jafri
authors.forename: Octavio
authors.initials: O
authors.lastname: Ramilo
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology*; D000914:Antibodies, Viral / Q000276:immunology; D001992:Bronchoalveolar Lavage Fluid / Q000821:virology; D018925:Chemokines / Q000096:biosynthesis / Q000097:blood / Q000276:immunology; D016207:Cytokines / Q000096:biosynthesis* / Q000097:blood / Q000276:immunology; D004195:Disease Models, Animal; D005260:Female; D051379:Mice; D008807:Mice, Inbred BALB C; D018357:Respiratory Syncytial Virus Infections / Q000276:immunology / Q000628:therapy* / Q000821:virology; D012136:Respiratory Syncytial Viruses / Q000276:immunology* / Q000502:physiology; D010948:Viral Plaque Assay / Q000379:methods; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000911:Antibodies, Monoclonal; D000914:Antibodies, Viral; D018925:Chemokines; D016207:Cytokines