tetano
Editor, Senior Moderator
Antiviral Res. 2014 Sep 10. pii: S0166-3542(14)00253-8. doi: 10.1016/j.antiviral.2014.08.016. [Epub ahead of print]
Evaluation of a fully human monoclonal antibody against multiple Influenza A viral strains in mice and a pandemic H1N1 strain in nonhuman primates.
Song A1, Myojo K2, Laudenslager J3, Harada D2, Miura T2, Suzuki K2, Kuni-Kamochi R2, Soloff R3, Ohgami K2, Kanda Y2.
Author information
Abstract
Influenza virus is a global health concern due to its unpredictable pandemic potential. Frequent mutations of surface molecules, hemagglutinin (HA) and neuraminidase (NA), contribute to low efficacy of the annual flu vaccine and therapeutic resistance to standard antiviral agents. The populations at high risk of influenza virus infection, such as the elderly and infants, generally mount low immune responses to vaccines, and develop severe disease after infection. Novel therapeutics with high effectiveness and mutation resistance are needed. Previously, we described the generation of a fully human influenza virus matrix protein 2 (M2) specific monoclonal antibody (mAb), Z3G1, which recognized the majority of M2 variants from natural viral isolates, including highly pathogenic avian strains. Passive immunotherapy with Z3G1 significantly protected mice from the infection when administered either prophylactically or 1-2 days post infection. In the present study, we showed that Z3G1 significantly protected mice from lethal infection when treatment was initiated 3 days post infection. In addition, therapeutic administration of Z3G1 reduced lung viral titers in mice infected with different viral strains, including amantadine- and oseltamivir-resistant strains. Furthermore, prophylactic and therapeutic administration of Z3G1 sustained O2 saturation and reduced lung pathology in monkeys infected with a pandemic H1N1 strain. Finally, de-fucosylated Z3G1 with an IgG1/IgG3 chimeric Fc region was generated (AccretaMab? Z3G1), and showed increased ADCC and CDC in vitro. Our data suggest that the anti-M2 mAb Z3G1 has great potential as a novel anti-flu therapeutic agent.
Copyright ? 2014 Elsevier B.V. All rights reserved.
KEYWORDS:
Antibody; Influenza A; Matrix protein 2; Therapeutic; Virus infection
PMID:
25218949
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/25218949
Evaluation of a fully human monoclonal antibody against multiple Influenza A viral strains in mice and a pandemic H1N1 strain in nonhuman primates.
Song A1, Myojo K2, Laudenslager J3, Harada D2, Miura T2, Suzuki K2, Kuni-Kamochi R2, Soloff R3, Ohgami K2, Kanda Y2.
Author information
Abstract
Influenza virus is a global health concern due to its unpredictable pandemic potential. Frequent mutations of surface molecules, hemagglutinin (HA) and neuraminidase (NA), contribute to low efficacy of the annual flu vaccine and therapeutic resistance to standard antiviral agents. The populations at high risk of influenza virus infection, such as the elderly and infants, generally mount low immune responses to vaccines, and develop severe disease after infection. Novel therapeutics with high effectiveness and mutation resistance are needed. Previously, we described the generation of a fully human influenza virus matrix protein 2 (M2) specific monoclonal antibody (mAb), Z3G1, which recognized the majority of M2 variants from natural viral isolates, including highly pathogenic avian strains. Passive immunotherapy with Z3G1 significantly protected mice from the infection when administered either prophylactically or 1-2 days post infection. In the present study, we showed that Z3G1 significantly protected mice from lethal infection when treatment was initiated 3 days post infection. In addition, therapeutic administration of Z3G1 reduced lung viral titers in mice infected with different viral strains, including amantadine- and oseltamivir-resistant strains. Furthermore, prophylactic and therapeutic administration of Z3G1 sustained O2 saturation and reduced lung pathology in monkeys infected with a pandemic H1N1 strain. Finally, de-fucosylated Z3G1 with an IgG1/IgG3 chimeric Fc region was generated (AccretaMab? Z3G1), and showed increased ADCC and CDC in vitro. Our data suggest that the anti-M2 mAb Z3G1 has great potential as a novel anti-flu therapeutic agent.
Copyright ? 2014 Elsevier B.V. All rights reserved.
KEYWORDS:
Antibody; Influenza A; Matrix protein 2; Therapeutic; Virus infection
PMID:
25218949
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/25218949