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Anti-TNF-alpha humanized monoclonal antibody TCX060 having low immunogenicity and low ADCC/CDC function and application of anti-TNF-alpha humanized monoclonal antibody TCX060

A monoclonal antibody, humanized technology, applied in DNA/RNA fragments, applications, antibodies, etc., can solve problems such as limiting antibody re-administration, reducing patient treatment benefits, and lack of antibodies

Active Publication Date: 2020-11-10
北京天成新脉生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Immune response may cause immune complex-mediated clearance of antibody or fragment from circulation and render repeated dosing inappropriate for therapy, reducing therapeutic benefit to patient and limiting re-administration of antibody
At the same time, the original research of Cytol beads needs to be used in combination with immunosuppressants, which greatly increases the risk of side effects
However, there are no reports of antibodies to TNF-α with low immunogenicity

Method used

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  • Anti-TNF-alpha humanized monoclonal antibody TCX060 having low immunogenicity and low ADCC/CDC function and application of anti-TNF-alpha humanized monoclonal antibody TCX060
  • Anti-TNF-alpha humanized monoclonal antibody TCX060 having low immunogenicity and low ADCC/CDC function and application of anti-TNF-alpha humanized monoclonal antibody TCX060
  • Anti-TNF-alpha humanized monoclonal antibody TCX060 having low immunogenicity and low ADCC/CDC function and application of anti-TNF-alpha humanized monoclonal antibody TCX060

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 Analysis and Design of Certolizumab Monoclonal Antibody with Low ADCC / CDC Function and Reduced Immunogenicity

[0054] The present invention analyzes and evaluates the original sequence of the certoliz monoclonal antibody by using the commercial DNAStarTM software, and the analysis result shows that the immunogenicity of the original certoliz monoclonal antibody sequence is very low. It is speculated that after the PEGylation of the original certolizumab monoclonal antibody was performed to remove the ADCC / CDC function, the multimer of the antibody increased, which in turn caused the ADA of the drug to be as high as 23%. Therefore, it is necessary to remove the PEGylation modification of the original certolizumab monoclonal antibody, and at the same time reduce its ADCC / CDC function. The amino acid sequences of the full length of the light chain and the variable region of the heavy chain of the original certo beads are shown in SEQ ID NO.1 and SEQ ID NO.2, res...

Embodiment 2

[0056] Example 2 Construction of the expression vector of anti-TNF-α humanized monoclonal antibody TCX060

[0057] According to the amino acid sequence of the full-length heavy chain and light chain of the anti-TNF-α fully humanized monoclonal antibody H2L0 obtained in Example 1 and the codon preference of the host, the nucleotides encoding the heavy chain H2 and the light chain L0 were designed sequence (wherein the nucleotide sequence of L0 is shown in SEQ ID NO.6, and the nucleotide sequence of H2 is shown in SEQ ID NO.5), and the enzyme cutting sites on both sides of the light chain sequence are designed to be Hind III+EcoR I. Design the enzyme cutting sites on both sides of the heavy chain sequence as Hind III+EcoR I, send the full-length heavy chain and light chain full-length sequences carrying the enzyme cutting sites to Jinweizhi Company to synthesize the whole gene sequence, and synthesize the used The connection vector is pUC57. Using pEE12.4 (for heavy chain expre...

Embodiment 3

[0059] Example 3 Transient Expression of Anti-TNF-α Humanized Monoclonal Antibody TCX060

[0060] The Escherichia coli DH5α strains obtained in Example 2 carrying the expression vectors of the full-length genes of the heavy chain H2, H0 and light chain L0 were cultured, the cultures were harvested, and the Qiagen UltraPure plasmid DNA purification kit was used to extract and purify the heavy chain and light chain full-length gene expression vector. The above-mentioned purified plasmid DNA was transfected into 293F cells using the liposome method kit of Invitrogen Company, and the transfection method was referred to the kit instructions.

[0061] The positive cells obtained by transfection were used for antibody expression, and the expression level of the monoclonal antibody TCX060 whose combination of heavy chain and light chain is H2L0 is shown in Table 2.

[0062] Table 2 The expression level detection result of monoclonal antibody TCX060 (mg / L)

[0063]

[0064]The ant...

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Abstract

The invention relates to the technical field of biology, in particular to an anti-TNF-alpha humanized monoclonal antibody TCX060 having low immunogenicity and low ADCC / CDC function and an applicationof the anti-TNF-alpha humanized monoclonal antibody TCX060. The anti-TNF-alpha humanized monoclonal antibody TCX060 provided by the invention is obtained by modifying a cetuzumab monoclonal antibody as follows: (1) removing PEG modifications; (2) performing transforming into a humanized IgG1 subtype full-length antibody; and (3) inserting a flexible amino acid fragment between a CDR3 region and aCH2 region. The binding affinity of the TCX060 and humanized TNF alpha is close to that of cetuzumab, binding of the TNF alpha and a cell surface TNF receptor can be specifically blocked, the ADCC / CDCfunction of the TCX060 is close to that of the PEG cetuzumab monoclonal antibody, the immunogenicity of the TCX060 is obviously lower than that of the cetuzumab monoclonal antibody, the risk that theantibody generates immunogenicity in bodies is reduced while removing the ADCC / CDC function, and excellent application value can be achieved.

Description

technical field [0001] The invention relates to the field of biotechnology, in particular to TCX060, an anti-TNF-α humanized monoclonal antibody with low immunogenicity and low ADCC / CDC function, and its application. Background technique [0002] Tumor necrosis factor alpha (TNF-α) is a cytokine secreted by immune cells and naturally secreted during inflammation and immune response. Studies have shown that the content of TNF-α in patients with various chronic diseases (such as Crohn's disease, multiple sclerosis, rheumatoid arthritis, ulcerative colitis, etc.) tends to be up-regulated (for example, in rheumatoid TNF-α levels are elevated in the synovial fluid of patients with acute arthritis (RA), and play an important role in processes such as pathological inflammation and joint destruction. The molecular weight of human TNF-α is 17kDa, and it can exist in the form of monomer or trimer in vivo, and its active form is trimer. TNF-α exerts biological activity by interacting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K16/24C12N15/13A61K39/395A61P35/00A61P29/00A61P37/02
CPCC07K16/241A61P35/00A61P29/00A61P37/02C07K2317/24C07K2317/76C07K2317/92C07K2317/33C07K2317/732C07K2317/734A61K2039/505A61P37/04C12N15/62C07K2317/52C07K2317/524C07K2317/565
Inventor 孙乐任文林
Owner 北京天成新脉生物技术有限公司
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