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Variable region of light chain and heavy chain genes of anti-KDR monoclonal antibody and its use

A variable region and antibody technology, applied in the application field of diagnosis and therapeutic drugs, can solve the problems of limited application and achieve the effect of wide application prospects

Inactive Publication Date: 2005-01-26
INST OF HEMATOLOGY & BLOOD HOSPITAL CHINESE ACAD OF MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the human anti-mouse antibody (HAMA) reaction generated when the mouse monoclonal antibody is used as a heterologous protein is a major defect that limits its application.

Method used

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  • Variable region of light chain and heavy chain genes of anti-KDR monoclonal antibody and its use
  • Variable region of light chain and heavy chain genes of anti-KDR monoclonal antibody and its use
  • Variable region of light chain and heavy chain genes of anti-KDR monoclonal antibody and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, Cloning of Anti-KDR Antibody Light and Heavy Chain Variable Region Genes

[0021] 1. Total RNA extraction: extract total RNA by one-step guanidinium isothiocyanate method (Chomczynski P, Sacchi N, Single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction. Anal. Biochem. 1987, 162: 156) ,

[0022] 2. Reverse transcription: Take 2μg total RNA and place it in a 0.5ml Eppendoff tube, add 5×RTbuffer, 0.1M DTT, 100ng random primers, 4×dNTP each 10nmol, Rnasin 20U, put in a water bath at 65°C for 5-10min, then add 200U of M-MLV reverse transcriptase, placed in a 37°C water bath for 1 hour, then transferred to a 72°C water bath for 10 minutes.

[0023] 3. PCR amplification of the light and heavy chain variable region genes: Take 8 μl of the reverse transcription product and put it in a PCR tube, add 2 μl of 10mM dNTP, 10 μl of 10×PCR buffer, 2U of Pyrobest DNA polymerase, and use universal degenerate primers P1 and P2 respectiv...

Embodiment 2

[0030] Example 2, Construction of Single Chain Antibody Gene Expression Vector pAYZKDR ScFv

[0031] According to the enzyme cleavage map of the light and heavy chain variable regions and the enzyme cleavage site of the construction vector pAYZ, designed and synthesized for V H , V L Primers for gene amplification and splicing. Firstly, primers P5, P6, P7, and P8 were used to amplify the heavy chain and light chain variable region genes respectively, and then the antibody light and heavy chain variable region genes were coded with one code (G 4 The DNA fragments of S)3 short peptides are spliced ​​into 5′V H -Linker-V L 3'fragment, and finally use P5 and P8 to amplify the full-length ScFv gene, and introduce Mull I and Not I restriction endonuclease sites at the 5' end and 3' end respectively, and through enzyme digestion, the full-length ScFv The gene was loaded into the pAYZ expression vector, constructed as figure 1 The indicated anti-KDR ScFv expression vector pAYZKDR...

Embodiment 3

[0038] Example 3. Expression, purification and renaturation of anti-KDR ScFv antibody fragments

[0039] 1. Expression of anti-KDR ScFv antibody fragments

[0040] Transform E.Coli 16C9 with the constructed pAYZKDR ScFv plasmid, pick a single colony and inoculate it in 5ml of 2×YT medium containing 100mg / L ampicillin (each 1000ml contains 16g of peptone, 10g of yeast extract, 5g of sodium chloride, pH7. 4), 37°C, 250rpm, shaking culture for 10h; 4000rpm, 4°C centrifugation for 10min to collect the bacteria, resuspended in 20ml of induction medium containing 100mg / L ampicillin (15g of glucose per 1000ml, 11g of tyrosine protein hydrolyzate , yeast extract 0.6g magnesium sulfate 0.19g, ammonium chloride 1.07, potassium chloride 3.73g, sodium chloride 1.2g, 1mol / L triethanolamine 120ml, pH7.4), 30°C, 250rpm, shaking culture for 24h; The cells were collected by centrifugation at 8000 rpm and 4°C for 10 min.

[0041] The cell pellet was resuspended in 1 / 30 culture volume of ice-p...

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Abstract

The invention discloses the variable region of light chain and heavy chain genes of anti-KDR monoclonal antibody and its use, polypeptides encoded by the gene, the carrier containing the gene the use of them in diagnosing and preparing medicament for treating Angiogenesis (in particular tumor Angiogenesis). The prepared anti-KDR ScFv preserves the recognition function of the murine monoclonal antibody to KDR antigens.

Description

technical field [0001] The present invention relates to anti-KDR (kinase insert domain-containing receptor, KDR, VEGFR-2, human vascular endothelial growth factor receptor II) monoclonal antibody Ycom1D3 heavy chain and light chain variable region genes, polypeptides encoded by the genes, The carrier containing the gene and the application of the gene and polypeptide in the preparation of diagnosing and treating drugs for angiogenesis diseases (especially tumor angiogenesis). Specifically, the heavy chain and light chain variable region genes of the present invention are derived from anti-KDR monoclonal antibody Ycom1D3. Background technique [0002] Malignant tumors are one of the most important diseases in my country, and tumor angiogenesis is the basis of tumor growth and metastasis. When a solid tumor grows beyond 1mm-2mm in diameter, the intervention and maintenance of new blood vessels is necessary, otherwise it will cause tumor necrosis and apoptosis. dead or dormant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K38/16A61P35/00C07H21/04C07K14/435C07K14/47C07K16/18C12N15/11C12N15/63G01N33/68
Inventor 杨纯正李容熊冬生邵晓枫许元富彭晖杨铭王金宏纪庆范冬梅王彩云齐静
Owner INST OF HEMATOLOGY & BLOOD HOSPITAL CHINESE ACAD OF MEDICAL SCI
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