Generating and characterizing monoclonal and polyclonal antibodies against avian H5N1 hemagglutinin protein.
Accurate and timely diagnoses are central to H5N1 infection control. Here we describe the cloning and expression of the HA1 protein of the A/Vietnam/1203/04 strain in a bacterial system to generate mono-/polyclonal antibodies. All of the eight generated monoclonal antibodies recognized the same linear epitope on the top globular region of the HA structure -- a highly conserved epitope among all circulating H5N1 clades identified by amino acid alignment. Results from immunofluorescence staining and Western blotting indicate that all monoclonal antibodies interacted with a denatured form of HA proteins, while the resultant polyclonal antibodies recognized both denatured and native HA proteins on H5N1 reverse-genetics (RG) viruses. Results from flow cytometry and microneutralization assays indicate that the polyclonal antibodies blocked viral binding and neutralized H5N1-RG viruses. Our results may prove useful to establishing future H5N1 mono-and polyclonal antibodies, and perhaps contribute to the development of an alternative H5N1 vaccine.
Wang
Sheng-Fan
SF
Department of Biotechnology and Laboratory Science in Medicine, National Yang-Ming University, Taipei, Taiwan.
Chen
Kuan-Hsuan
KH
Thitithanyanont
Arunee
A
Yao
Ling
L
Lee
Yuan-Ming
YM
Chan
Yu-Jiun
YJ
Liu
Shih-Jen
SJ
Chong
Pele
P
Liu
Wu-Tse
WT
Huang
Jason C
JC
Chen
Yi-Ming Arthur
YM