Whole human TNF alpha (tumor necrosis factor alpha) monoclonal antibody and preparation and application thereof
A monoclonal antibody and polynucleotide technology, applied in the fields of application, antibody, anti-inflammatory agent, etc., can solve the problem of low abundance of precursor cells, and achieve the effects of avoiding short half-life, reducing pain, and good affinity
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Embodiment 1
[0024] The acquisition of embodiment 1 anti-human TNFa antibody gene
[0025] Take 5 milliliters of peripheral blood from patients with active rheumatoid arthritis, separate leukocytes with lymphocyte separation medium, culture them, and identify positive clones according to the results of ELISA.
[0026] 1. Select blood sample
[0027] In order to obtain human B cells that secrete anti-human TNFα, human TNFα (purchased from Shenzhen Jingmei Company) was used to routinely coat a 96-well plate, and each well was coated with 250 ng of the protein overnight. Then, it was blocked with 5% skimmed milk powder at room temperature for 2 hours, and the milk powder was prepared with pH7.2 PBS. After washing, 100 microliters of sera from different patients were added and incubated at room temperature for 1 hour. Then add peroxidase-labeled goat anti-human IgG and let stand at room temperature for 1 hour. After washing at least 5 times, add TMD or other chromogenic reagents and treat a...
Embodiment 2
[0050] The preparation of embodiment 2 anti-human TNFa antibodies
[0051] 1. Obtaining the heavy chain and light chain coding sequences
[0052] In order to express the gene of the full-length antibody, according to the sequencing results of Example 1, the full-length heavy chain and light chain sequences of human IgG1 were synthesized, so as to constitute a complete anti-human TNFa antibody-01 gene.
[0053] The following fragment is the light chain coding region, the length is: 645bp. (SEQ ID NO:1) GAAATTGTGCTCACACAGTCACCAGACTTTCAGTCTGTCACCCCTAAGGAGAAAGTGACCATCACTTGCAGGGCCTCTCAGTTCGTCGGCTATAGTATCC ACTGGTACCAGCAGAAACCCGATCAGTCCCCTAAACTGCTGATCAAGTACGCCTCTGAATCAAGGTCAGGTGTCCCCAGTCGATTTTCTGGATCAGGATC TGGTACCGACTTCACCCTCACCATCAATAGCTTGGAGGCCGAGGACGCTGCTACCTACTACTGCCAACAAAGCCACAGCTGGCACTTTACTTTTGGCCAG GGGACCAAGCTTGAGATCAAACGAACTGTGGCTGCACCATCTGTCTTCATCTTCCCGCCATCTGATGAGCAGTTGAAATCTGGAACTGCCTCTGTTGTGT
[0054] 其编码的轻链氨基酸序列为(SEQ ID NO:3):EIVLTQSPDFQSVTPKEKVTITCRASQFVGYSIHWYQQKPDQSP...
Embodiment 3
[0070] PEGylation of embodiment 3 anti-human TNFa monoclonal antibody
[0071] The anti-human TNFa antibody obtained in Example 2 was structurally modified to introduce a free sulfhydryl group, and two protective agent amino acids AA were added after the 229th amino acid C to form a free sulfhydryl group, and further PEGylation, PEGylation and purification methods refer to APChampman et al. [Reference Literature: Therapeutic antibody fragments with prolonged in vivo halflife.Nature Biotech.V17 1999 August, Page 780-783] to obtain PEGylated anti-human TNFa monoclonal antibody. After identification by ELISA, it was confirmed that it reacted positively with TNFa. The prepared PEGylated antibody was tested for protection with L929 cells (ECACC 85011425) (refer to Example 5), and it was found that the PEGylated antibody had a good protective effect.
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