Abstract | BACKGROUND: METHODOLOGY/PRINCIPAL FINDINGS: We have characterized two recombinant baculovirus-expressed human antibodies (rhAbs), AVFluIgG01 and AVFluIgG03, generated by screening a Fab antibody phage library derived from a patient recovered from infection with a highly pathogenic avian influenza A H5N1 clade 2.3 virus. AVFluIgG01 cross-neutralized the most of clade 0, clade 1, and clade 2 viruses tested, in contrast, AVFluIgG03 only neutralized clade 2 viruses. Passive immunization of mice with either AVFluIgG01 or AVFluIgG03 antibody resulted in protection from a lethal H5N1 clade 2.3 virus infection. Furthermore, through epitope mapping, we identify two distinct epitopes on H5 HA molecule recognized by these rhAbs and demonstrate their potential to protect against a lethal H5N1 virus infection in a mouse model. CONCLUSIONS/SIGNIFICANCE: Importantly, localization of the epitopes recognized by these two neutralizing and protective antibodies has provided, for the first time, insight into the human antibody responses to H5N1 viruses which contribute to the H5 immunity in the recovered patient. These results highlight the potential of a rhAbs treatment strategy for human H5N1 virus infection and provide new insight for the development of effective H5N1 pandemic vaccines.
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Authors | Lina Sun, Xiuhua Lu, Chuan Li, Min Wang, Qinzhi Liu, Zi Li, Xiaofen Hu, Jiandong Li, Feng Liu, Qun Li, Jessica A Belser, Kathy Hancock, Yuelong Shu, Jacqueline M Katz, Mifang Liang, Dexin Li |
Journal | PloS one
(PLoS One)
Vol. 4
Issue 5
Pg. e5476
( 2009)
ISSN: 1932-6203 [Electronic] United States |
PMID | 19421326
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antibodies, Viral
- Peptide Fragments
- Peptide Library
- Recombinant Proteins
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Topics |
- Adult
- Amino Acid Sequence
- Amino Acid Substitution
- Animals
- Antibodies, Viral
(genetics, immunology)
- Blotting, Western
- Enzyme-Linked Immunosorbent Assay
- Epitope Mapping
- Female
- Fluorescent Antibody Technique
- Humans
- Immunization
- Influenza A Virus, H5N1 Subtype
(genetics, immunology)
- Mice
- Mice, Inbred BALB C
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Neutralization Tests
- Peptide Fragments
(immunology)
- Peptide Library
- Recombinant Proteins
(immunology)
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