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Human anti-h7n9 avian influenza virus neutralizing antibody h8, its preparation method and application

A bird flu virus and antibody technology, applied in antiviral agents, antiviral immunoglobulin, botanical equipment and methods, etc., can solve problems such as restrictions, blood-borne disease infection, and time-consuming

Inactive Publication Date: 2016-08-17
INST OF PATHOGEN BIOLOGY CHINESE ACADEMY OF MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Immunoglobulin (Ig), as an antibody component, mainly comes from the immune serum of donors (patients in convalescence), it takes a long time from obtaining positive serum to passing safety testing, and requires a lot of manpower and financial resources, which makes it Large-scale production is limited, and because the antibody is mainly derived from serum, it is prone to infection of blood-borne diseases

Method used

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  • Human anti-h7n9 avian influenza virus neutralizing antibody h8, its preparation method and application
  • Human anti-h7n9 avian influenza virus neutralizing antibody h8, its preparation method and application
  • Human anti-h7n9 avian influenza virus neutralizing antibody h8, its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1 Materials and methods

[0033]1.1 Source of virus, cell and vector: H7N9 virus A / Anhui / 1 / 2013 strain has been published in the literature (Gao R, Cao B, Hu Y, Feng Z, Wang D, Hu W, Chen J, Jie Z, Qiu H, Xu K, Xu X, Lu H, Zhu W, Gao Z, Xiang N, Shen Y, He Z, Gu Y, Zhang Z, Yang Y, Zhao X, Zhou L, Li X, Zou S, Zhang Y, Li X, Yang L ,Guo J,Dong J,Li Q,Dong L,Zhu Y,Bai T,Wang S,Hao P,Yang W,Zhang Y,Han J,YuH,Li D,Gao GF,Wu G,Wang Y,Yuan Z , Shu Y.2013.Human infection with a novelavian-origin influenza A(H7N9)virus.N Engl J.Med.368:1888–1897), provided by the Institute of Pathogenic Biology, Chinese Academy of Medical Sciences. The cells used for the in vitro neutralization experiment of H7N9 avian influenza virus were MDCK cells, which were purchased from ATCC. The bacterial strain used to construct the phage antibody library was XL1-Blue (Stratagene, USA), and the vector pComb3H (provided by Scripps Research Institute, USA).

[0034] 1.2 Antigen preparation

[0035] ...

Embodiment 2

[0104] Example 2 Application of human-derived anti-H7N9 avian influenza virus neutralizing antibody H8

[0105] At present, there are no specific vaccines and drugs for the prevention and treatment of acute respiratory infectious diseases caused by the H7N9 virus. The immunoglobulins used clinically are often derived from the convalescent serum of patients infected with the virus, which limits their mass production. At the same time, because it comes from serum, it is prone to infection of blood-borne diseases. The invention provides a new approach for the treatment of acute respiratory infectious diseases caused by the H7N9 virus by using the human source anti-H7N9 avian influenza virus genetically engineered antibody H8 to replace the blood-derived immunoglobulin.

Embodiment 3

[0106] Example 3 The method for preparing full antibody immunoglobulin IgG by using neutralizing antibody H8

[0107] 1. Expression and purification of whole antibody IgG

[0108] ① Construction of whole antibody recombinant expression plasmid: first use primers (upstream primer 5'-CCCAAGCTTGTTGCTCTGGATCTCTGGTGCCTACGGGGACATCCAGATGACCCAGTCTCCATCCTCC-3', downstream primer 5'-CTAGTCTAGAATTAACACTCTCCCCTG-3') to amplify the light chain segment of the Fab antibody, digest with XbaI / HindIII, Cloned into PIgG vector (provided by Scripps Research Institute, USA) (Christoph Rader, Mikhail Popkov, JohnA.Neves, and Carlos F.Barbas III. Integrinαvβ3-targeted therapy for Kaposi.ssarcoma with an in vitro-evolved antibody. The FASEB Journal.( October 18, 2002) 10.1096 / fj.02-0281fje.), the vector PIgG-L was obtained. Then use primers (upstream primer 5'-GAGGAGCTCACTCCAGGTGCAGCTGCAGGAGTCGGGCCCAGGAC-3', downstream primer 5'-GAGGGGCCCTTGGTGGAGGCTGAGGAGACGGT-3') to amplify the heavy chain segment...

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Abstract

The present invention provides a human anti-H7N9 avian influenza virus neutralizing antibody H8 screened by phage surface display technology, the amino acid sequences of its light chain and heavy chain variable regions are respectively as SEQ ID No.1 and SEQ ID No. 2 shown. The antibody can specifically recognize the H7N9 virus particle antigen, can have a significant enzyme-linked immune reaction with the H7N9 virus, and has a neutralizing activity against H7N9 virus infection. In addition, the antibody of the present invention can be made into a specific antibody drug for preventing and treating H7N9 avian influenza virus, so as to be clinically used for preventing and treating acute respiratory infectious diseases caused by H7N9 virus.

Description

technical field [0001] The invention relates to genetic engineering and phage surface display technology, in particular to human-sourced anti-H7N9 avian influenza virus neutralizing antibody H8, its preparation method and application. Background technique [0002] H7N9 avian influenza is an acute respiratory infectious disease caused by H7N9 avian influenza virus. Since February 2013, cases of severe pneumonia of unknown cause have occurred successively in Shanghai, Anhui Province, and Jiangsu Province. Patients generally present with flu-like symptoms, such as fever, cough, and less sputum, which may be accompanied by headache, muscle aches, and general malaise. The condition of severe patients develops rapidly, manifested as severe pneumonia, with body temperature mostly above 39°C, dyspnea, and may be accompanied by hemoptysis and sputum; acute respiratory distress syndrome, mediastinal emphysema, sepsis, shock, consciousness may develop rapidly Obstacles and acute kidn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K16/10C12N15/13C12N15/63A61K39/42A61P31/16G01N33/569
Inventor 陈哲金奇
Owner INST OF PATHOGEN BIOLOGY CHINESE ACADEMY OF MEDICAL SCI
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