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Monoclonal antibodies for antagonizing and inhibiting combination of programmed death-1 (PD-1) and ligands of PD-1, hybridoma cell line secreting monoclonal antibodies and application of monoclonal antibodies

A hybridoma cell line and monoclonal antibody technology, applied in anti-receptor/cell surface antigen/cell surface determinant immunoglobulin, anti-animal/human immunoglobulin, analytical materials, etc., can solve high safety risks and uncertainties, adverse reactions and other issues

Inactive Publication Date: 2015-04-29
SUZHOU STAINWEI BIOTECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Directly increasing the expression of co-stimulatory factors such as CD28 can achieve the effect of upregulating immune function, but in a phase I clinical study involving an anti-CD28 monoclonal antibody drug code-named TGN1412 conducted in the UK in 2006, 6 healthy subjects The patient had extremely serious adverse reactions on the day of receiving the injection of the antibody drug (Suntharalingam G et al.: Cytokine storm in a phase1trial of the anti-CD28monoclonal antibody TGN1412
NEJM2006,355: 1018-1028), so the current scientific community generally believes that the clinical application of agonistic anti-CD28 antibody drugs has high safety risks and uncertainties, and there are many concerns about their future development and marketing prospects

Method used

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  • Monoclonal antibodies for antagonizing and inhibiting combination of programmed death-1 (PD-1) and ligands of PD-1, hybridoma cell line secreting monoclonal antibodies and application of monoclonal antibodies
  • Monoclonal antibodies for antagonizing and inhibiting combination of programmed death-1 (PD-1) and ligands of PD-1, hybridoma cell line secreting monoclonal antibodies and application of monoclonal antibodies
  • Monoclonal antibodies for antagonizing and inhibiting combination of programmed death-1 (PD-1) and ligands of PD-1, hybridoma cell line secreting monoclonal antibodies and application of monoclonal antibodies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Establishment and screening identification of mouse hybridoma cell lines secreting anti-PD-1 antibody

[0043] Step 1. Obtaining recombinant human PD-1 protein (immunization antigen) and animal immunization

[0044] In the embodiment of the present invention, the human PD-1 protein used for immunization is the recombinant human PD-1 extracellular protein expressed by mammals (product of Beijing Yiqiao Shenzhou Company). After the recombinant human PD-1 protein was mixed with complete Freund's adjuvant (product of Sigma, USA), Balb / c mice were injected subcutaneously at multiple points (100 μl / mouse, 5-10 μg PD-1 protein in total). 2-3 weeks after the first immunization, the mice were injected subcutaneously with a mixture containing PD-1 protein and Freund's incomplete adjuvant (product of Sigma, USA). After 2-3 booster immunizations, a small amount of mouse serum was taken , using the 96-plate coated with human PD-1 protein to detect the titer of anti-PD-1 ...

Embodiment 2

[0051] Example 2 Flow cytometry detection and analysis of the binding of murine AB7 monoclonal antibody to CHO cells transfected with human PD-1 gene

[0052]In this example, the AB7 antibody was used as the primary antibody, and FITC fluorescently labeled goat anti-mouse IgG was used as the secondary antibody, and flow cytometry was used to detect and analyze the binding of the AB7 antibody to CHO cells transfected with the human PD-1 gene. To this end, total mRNA was first extracted from human peripheral blood lymphocytes (PBL), and then amplified in vitro by Reverse transcription-polymerase chain reaction (RT-PCR) to obtain the full-length protein encoding PD-1 (including extracellular and intracellular region) cDNA fragment. The primers used for RT-PCR were PD-1 forward primer: ATTAAGCTTGAGCAGTGGAGAAGGCGG, PD-1 reverse primer: AATTGGATCCCTCCTGAGGAAATGGGCTGA). The cDNA fragment amplified by the pair of primers covers the entire coding region of the PD-1 protein, with a len...

Embodiment 3

[0054] Example 3. In vitro preparation and purification of mouse-derived anti-human PD-1 monoclonal antibody (AB7)

[0055] In this example, the mouse anti-human PD-1 monoclonal antibody (AB7) protein was obtained by separation and purification by affinity chromatography.

[0056] Its purification steps are as follows:

[0057] After the AB7 hybridoma cells were amplified, they were inoculated in 200-500ml of serum-free 1640 medium, cultured at 37°C for 5 days, then the culture supernatant was collected, filtered through a 0.45μm filter membrane, and loaded onto Protein G-Sepharose Fast Flow (purchased from General Electric GE Company) affinity chromatography column; the chromatography column was first rinsed with PBS solution to remove impurity proteins, and then the adsorbed AB7 antibody was eluted with low pH (2.7-3.0) glycine (0.1M) solution protein. The eluate was adjusted to pH 7.0 with 1mol / L Tris (pH8.5-9.0), and then dialyzed against 10 times the volume of PBS solut...

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Abstract

The invention discloses mice monoclonal antibodies for antagonizing and inhibiting combination of programmed death-1 (PD-1) and ligands of PD-1 and a hybridoma cell line secreting the monoclonal antibodies. The preservation number of the hybridoma cell line is CGMCC No. 8351. The invention further discloses an application of the monoclonal antibodies to detection of PD-1 protein.

Description

technical field [0001] The invention belongs to the field of biotechnology-monoclonal antibody. The invention relates to a monoclonal antibody that antagonizes and inhibits the binding of PD-1 (programmed death-1) protein to its ligand, a hybridoma cell line that secretes it, and its application. Background technique [0002] For a long time, the biomedical community has always believed that the occurrence and development of tumors are closely related to the state of immune function in the body. Under normal conditions, the immune function in the body plays a role in monitoring the mutated tumor cells and inhibiting the development of tumors. However, when the immune function in the body is low or the function is inhibited, the mutation and growth of tumor cells will be accelerated, and even life-threatening in severe cases. Therefore, immunotherapy (Immunotherapy) aimed at improving immune function has become a major goal and means in the international clinical treatment ...

Claims

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Application Information

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IPC IPC(8): C12N5/20C07K16/28G01N33/68G01N33/577
Inventor 胡红群宋晓琦陈蕞孙亚男蔡明文罗师平袁燕萍周群敏徐一清
Owner SUZHOU STAINWEI BIOTECH INC
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