Chimeric antigen receptor, immune cell modified by chimeric antigen receptor and application of immune cell to treatment of advanced pancreatic cancer
A chimeric antigen receptor and immune cell technology, applied in genetically modified cells, cells modified by introducing foreign genetic material, and antibody medical components, etc., can solve the problems of tumor cell immune escape, increase high affinity, overcome the The effect of clearing too fast and improving the curative effect
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Embodiment 1
[0032] Example 1 Construction of scFv (TGF-β) and verification of affinity
[0033] 1. Preparation of pLent-scFv plasmid
[0034] Select the VH-VL part of the antibody and fuse it with CD8Leader to obtain the fusion gene piece CD8Leader-VH-VL, the gene fragment is the nucleotide sequence shown in SEQ ID NO.2;
[0035] Entrusted Nanjing GenScript Biotechnology Co., Ltd. to synthesize the entire expression cassette of the pre-designed fusion gene, and inserted it into the NotI-AsiSI site of the pLent-C-GFP vector (Invitrogen) to construct the pLent-scFv (TGF-β) vector (See image 3 ), transformed into E.coli (DH5α) for expression, after correct sequencing, use Omega’s Endo-Free Plasmid Maxi Kits kit to extract and purify the plasmid to obtain plasmid pLent-scFv, and use Tecan Infinite 200PRO microplate reader to measure the extracted plasmid The concentration (>2mg / ml) and purity (A260 / A280 is 1.8-2.0), the scFv (TGF-β) in this process is designed based on the variable region ...
Embodiment 2
[0043] Example 2 Construction of Lentiviral Plasmid Expressing Chimeric Antigen Receptor Protein
[0044] 1. Insert the fusion gene sheet CD8Leader-scFv(TGF-β)-T2A-CD8Leader-scFv(GPC-1)-CD8-CD28-CD3ζ into the lentiviral expression vector pLent-EF1a-FH-CMV-RFP-P2A-Puro vector ;
[0045] CD8Leader-scFv(TGF-β)-T2A-CD8Leader-scFv(GPC-1)-CD8-CD28-CD3ζ CAR module representation image 3 (See appendix SEQ ID NO.1 for the complete nucleic acid sequence);
[0046] The sequences of the CAR modules of CD8Leader-scFv(TGF-β)-T2A-CD8Leader-scFv(GPC-1)-CD8-CD28-CD3ζ are as follows:
[0047] (1) Artificial sequence of self-cleaving polypeptide T2A nucleic acid (SEQ ID NO.3);
[0048] (2) Nucleic acid artificial sequence (SEQ ID NO.2) of scFv (TGF-β);
[0049] (3) artificial sequence of the leader CD8Leader nucleic acid (SEQ ID NO.4);
[0050] (4) scFv (GPC-1) nucleic acid artificial sequence (SEQ ID NO.5);
[0051] (5) CD8 Hinge region nucleic acid artificial sequence (SEQ ID NO.6);
...
Embodiment 3
[0059] Example 3 Preparation and detection of CAR (TGF-β-GPC-1)-T cells
[0060] 1. Lymphocytes were separated by Ficoll density gradient centrifugation, and CAR(TGF-β-GPC-1)-T cells were prepared
[0061] After signing the informed consent form from healthy adult volunteers, draw 30ml of peripheral blood with an EDTA anticoagulant tube, mix it with normal saline 1:1; then take an equal volume of lymphocyte separation medium, and gently add the diluted peripheral blood sample to the separation medium On the surface, to prevent the peripheral blood sample from breaking through the interface of the separation liquid, centrifuge at 2500rpm at room temperature for 20 minutes; after the centrifugation, the liquid surface is divided into 4 layers, which are diluted plasma layer, mononuclear cell layer, separation liquid layer and red blood cell layer from top to bottom. ;Collect the mononuclear cell layer carefully, and transfer it to a new centrifuge tube, resuspend and wash twice ...
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