BCMA specific chimeric antigen receptor T cell and application thereof
A chimeric antigen receptor, cell technology, applied in application, anti-receptor/cell surface antigen/cell surface determinant immunoglobulin, hybrid peptide, etc., can solve tissue and organ damage, CAR-T recognition error attack Normal cells, clinical side effects, etc.
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Embodiment 1
[0061] Example 1: Determination of anti-BCMA-CD8a-41BB-CD3ζ gene sequence
[0062] The gene sequence of the anti-human BCMA single-chain antibody is derived from the hybridoma cells of BCMA-immunized mice. The gene sequence information of human CD8α signal peptide region, hinge region and transmembrane region, human 4-1BB intracellular region and human CD3ζ intracellular region was searched from the NCBI website database. The above sequence was codon-optimized on the website http: / / www.jcat.de / to ensure that it is more suitable for human gene expression under the condition that the encoded amino acid sequence remains unchanged. A Kozak sequence and restriction site were introduced at the amino-terminal of the signal peptide gene sequence, and the nucleotide sequences of each segment were sent to Shanghai Sangon Biotechnology Co., Ltd. for synthesis. See SEQUENCE LISTING (SEQ ID NO: 1-22) for the sequence information of each gene. The structure of the successfully constructed...
Embodiment 2
[0063] Example 2: Construction of anti-BCMA-CD8a-41BB-CD3ζ lentiviral vector
[0064] Using overlapping PCR, the above-mentioned synthetic sequences were sequentially linked according to the sequence of signal peptide, anti-BCMAscFv, human CD8α hinge region, human CD8α transmembrane region, human 4-1BB intracellular region, and human CD3ζ intracellular region to form a complete anti- BCMA-CAR gene sequence information to obtain the CAR molecule (hereinafter referred to as "anti-BCMA-CAR"). The nucleotide sequence of anti-BCMA-CAR is shown in SEQ ID NO: 21 or SEQ ID NO: 22, and the encoded amino acid sequence is shown in SEQ ID NO: 19 or SEQ ID NO: 20.
[0065] The nucleotide sequence of anti-BCMA-CAR was double-digested with EcoR I and BamH I, and then inserted into the modified lentiviral vector pLVX-EF1a-GFP-N1 (Addgene) by T4 DNA ligase with EcoR I and BamH I. site, transformed into competent DH5α Escherichia coli. The obtained recombinant plasmid was sent to Shanghai San...
Embodiment 3
[0066] Example 3: Packaging and titer determination of anti-BCMA-CAR lentivirus
[0067] Extract the lentiviral packaging vectors pMD2.G, psPAX2 and anti-BCMA-CAR lentiviral vectors with the operating instructions in the endotoxin-free plasmid extraction kit (Tiangen Bio) and co-transfect them into 293T cells. After transfection, 48h and The cell supernatant was collected at 72 hours, centrifuged at 400 rcf for 10 minutes, and the cells and cell debris in the supernatant were removed. Filter the supernatant with a 0.45 μm filter membrane, aliquot and freeze for future use.
[0068] According to the expected virus titer (MOI), the virus supernatant was serially diluted and then infected 293T cells. The positive rate of GFP was detected by fluorescence microscope. According to the formula, the titers of pLVX-CAR and pLVX-empty virus stocks were calculated to be about 2 respectively. ×10 6 TU / mL and 5×10 6 TU / mL. After the concentrated solution is concentrated, the titer can ...
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