WO2017214943A1 - Vecteur d'expression de lentivirus pour favoriser l'expression du gène tim-3 et son application - Google Patents
Vecteur d'expression de lentivirus pour favoriser l'expression du gène tim-3 et son application Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
Definitions
- the present invention belongs to the field of genetic engineering technology, and in particular relates to a lentiviral expression vector which promotes expression of a TIM-3 gene and an application thereof.
- Tumors can be used to strengthen the "army” by various methods: 1) Tumor cells have low expression or lack of expression of specific or related antigens, and down-regulate MHC-I molecules by gene defect or transcription down-regulation, and antigen-presenting cells cannot give T
- B7 molecule such as B7-l, B7-2 or up-regulation of B7-H1, B7-H2, etc., such that T cell activation is deficient in the second signal or induces T cell inactivation, Apoptosis
- Tumor cells can induce autologous apoptosis or induce T cell apoptosis by low expression of Fas and defective Fas signaling molecules or high expression of FasL
- 4) release of tumor-derived factors and induce regulatory T cells (Treg) , Regulatory DCs (DCreg), tumor-associated macrophages (TAM), long-term stimulation of a large number of tumor antigens and immune molecules, leading to T cell depletion.
- DCreg regulatory DCs
- TAM tumor-associated macrophages
- Negative co-stimulatory molecules PD-1 and Tim3 are important marker molecules for early and late viral responsive CD8+ T cell depletion, respectively. Therefore, the study of TIM-3 is expected to enhance the ability of T cells to kill tumor cells and rescue depleted T cells. However, the lack of lentiviral expression vectors that specifically promote the high expression of TIM-3 gene in the prior art makes the related studies not well. exhibition.
- the TIM-3 gene cDNA sequence of the I cleavage site was inserted into the multiple cloning site of the pLVX-IRES-Puro expression vector to construct a lentiviral expression vector which specifically promotes high expression of the TIM-3 gene, thereby completing the present invention.
- the present invention provides a lentiviral expression vector which specifically promotes high expression of a TIM-3 gene, including a basic sequence of a pLVX-IRE S-puro expression vector, a resistance gene sequence, a multiple cloning site sequence, a promoter sequence, and TI M-3 gene cDNA sequence; the multiple cloning site includes Spe I cleavage site and Not
- the TIM-3 gene cDNA sequence includes a Spe l cleavage site, a TIM-3 gene coding sequence and a Not I cleavage site, and the TIM-3 gene cDNA sequence is inserted into the poly Cloning of the site sequence.
- the lentiviral expression vector constructed by inserting the cDNA sequence of the TIM-3 gene into the pLVX-IRES-Puro expression vector has the advantages of high transfection efficiency, low dosage, sustainable, high efficiency and stability.
- the advantages of increasing the expression of TIM-3 gene can be used as a powerful tool for the preparation and treatment of TIM-3 gene expression in the treatment of diseases such as Alzheimer's disease.
- the TIM-3 gene coding sequence is obtained by PCR amplification
- the PCR primer comprises an upstream primer and a downstream primer
- the sequence of the upstream primer is: 5'-GACTAGTATGTTTTCACATCTTCCCTTTG -3', ie SEQ ID NO: 1
- the sequence of the downstream primer is: 5, - GGCGGCCGCTGTCGCTTTGCAATGCCATAG -3', ie SEQ ID NO: 2.
- the TIM-3 gene coding sequence can be amplified by PCR, and can be successfully inserted into the pLVX-IRES-Puro expression vector to continuously express the TIM-3 gene, which reduces the cost of sequence synthesis and lowers the cost.
- the present invention also provides a method for constructing a lentiviral expression vector which specifically promotes high expression of the TIM-3 gene, comprising the following steps:
- A) TIM-3 gene primer design According to the TIM-3 gene coding sequence, using Oligo 7 analysis, select 5'-GACTAGTATGTTTTCACATCTTCCCTTTG-3', ie SEQ ID NO: 1 as the upstream bow, select 5 '- GGCGGCCGCTGTCGCTTTGCAATGCCATAG -3, ie, SEQ ID NO: 2 as a downstream primer, then synthesizing the upstream primer and the downstream primer; the upstream primer and the downstream primer are free of primer dimer, and the annealing temperature difference is small;
- the successful bacterial liquid was sequenced and identified; the correct Escherichia coli was identified by liquid LB medium, and the pGM-T vector carrying the TIM-3 gene cDNA sequence was extracted, and the restriction endonuclease Spe I enzyme and Not I enzyme double digestion, electrophoresis, gelatinization to recover a fragment of about 1000 bp, this fragment is the TIM-3 gene cDNA sequence;
- the present invention utilizes genetic engineering technology to construct a lentiviral expression vector which specifically promotes high expression of TIM-3 gene. After successful identification, it is packaged into a virus and introduced into Jurkat cells. After screening cells with puromycin, the real-time fluorescence is quantified. The PCR and Western Blot techniques verified the change of TIM-3 gene expression from mRNA and protein levels, respectively. The experimental results confirmed that the TIM-3 gene cDNA sequence provided by the present invention was successfully inserted into the pLVX-I RES-Puro expression vector, which can be specific and sustained. Highly and stably promote high expression of TIM-3 gene.
- the present invention also provides a use of a lentiviral expression vector which specifically promotes high expression of a TIM-3 gene for the preparation of a medicament for treating a disease associated with abnormal expression of a TIM-3 gene.
- the lentiviral expression vector which specifically promotes the high expression of the TIM-3 gene provided by the invention has the advantages of high transfection efficiency, low dosage, and can promote the high expression of the TIM-3 gene in a specific, sustained, efficient and stable manner.
- the present invention also provides specific promotion of TIM-
- the construction method of the lentiviral expression vector with high expression of 3 gene has good operation effect, reduces the cost of sequence synthesis, and has low cost.
- 1 is a plasmid map of the pLVX-IRES-Puro expression vector.
- FIG. 2 is a schematic diagram showing the results of fluorescent quantitative PCR detection after puromycin screening of cells.
- Jurkat cells were purchased from the Cell Resource Center of the Shanghai Institute of Biological Sciences. 293FT cells were purchased from Thermo Fisher, Premix PrimeSTAR HS enzyme, lentiviral expression vector pLVX-IRES-Puro, virus packaging auxiliary kit, and Lenti-X GoStix kit. Purchased from Takara, RNeasy Mini
- Kit was purchased from QIAGEN, pGM-T was purchased from Tiangen, and Endo-Free Plasmid Mini Kit II was purchased from Omega bio-tek.
- TIM-3 gene coding sequence GenBank NMJ 2782.4
- Example 2 Construction of a lentiviral vector that specifically promotes high expression of the TIM-3 gene
- the coding sequence of the TIM-3 gene was sequenced with Premix PrimeSTAR HS enzyme. Amplification, electrophoresis recovery and then adding A tail reaction, using T4
- the DNA ligase was ligated to the pGM-T vector to obtain the ligation product (TIM-3-T vector), and the ligation product was transformed into competent E. coli DH5CC and uniformly coated on an ampicillin-containing LB medium plate at 37 Cultured at °C for 12 h, the same control group was set to negative control group 1 (the competent cells were uniformly coated on the ampicillin-free plate), and the negative control group 2 (the competent cells were uniformly coated with 100 g/ml ampicillin).
- positive control group 1 the connection product of the double enzyme-cut empty vector was uniformly coated on the plate containing 100 g/ml ampicillin
- positive control group 2 the empty carrier was uniformly coated in 100%
- the bacteria with the correct sequencing result were cultured in liquid LB medium for 14 h, and then the recombinant T vector containing the TIM-3 gene sequence was extracted, and the pLVX-IRES-Puro vector was firstly treated with Spe I enzyme and The Not I enzyme was double-digested, electrophoresed and recovered, and the product was recovered by T4 DNA ligase, and then transformed into competent E. coli DH50C, uniformly coated on an ampicillin-containing LB medium plate, and cultured at 37 ° C.
- the same negative control group 1 was set (the competent cells were uniformly coated on the ampicillin-free plate), and the negative control group 2 (the competent cells were uniformly coated on the plate containing 100 g/ml ampicillin) ), positive control group 1 (the ligation product of the double enzyme-cut empty vector was uniformly coated on a plate containing 100 g/ml ampicillin), positive control group 2 (the empty carrier was uniformly coated in 100 g/mL ampicillin) Penicillin on the plate).
- the experimental group grew a single colony, and the negative control group 1 grew colonies; the negative control group 2, the positive control group 1, and the positive control group 2 did not grow colonies.
- 293FT cells were cultured, and cells grown in good condition were inoculated into six wells, 1,000,000 cells per well, and the extracted recombinant plasmid pLVX-TIM-3 2 ⁇ ⁇ was transfected into 293FT using a lentiviral packaging auxiliary kit. After 48 h, the virus-containing supernatant medium was collected, and the virus solution was filtered through a sieve of 0.45 ⁇ m for infecting Jur kat cells, and the Lenti-X GoStix kit was used to detect the virus titer of 5000000 to 50000000 IFU.
- Jurkat cells were inoculated into 6-well plates at 1000000 cells per well. After 12 hours, the cell density was about 50 ⁇ 3 ⁇ 4, and the virus solution was taken separately. The virus was diluted 10 times with DMEM complete medium, and polybrene was added. ) The final concentration is 8 g/mL. The medium in the 6-well plate was added to the virus-containing DMEM complete medium (containing 10% fetal bovine serum). After 24 hours, the virus-containing DMEM complete medium was discarded, and the fresh DMEM complete medium was replaced. After 24 hours, 0.5 was used. The cells were screened at a g/ml concentration of puromycin. After 10 days of screening, the medium was changed once every 3 days, and the concentration of puromycin was continuously increased to 1.00 g/ml.
- Example 5 Fluorescence quantitative PCR was used to detect the expression level of TIM-3 gene.
- the primer design software Oligo 7.0 was used to design the bow.
- Kit reverse transcribes mRNA into cDNA, reverse transcription conditions: 37 ° C, 15 min; 85 ° C, 5 s; 4 ° C, ⁇ . After the end of reverse transcription, add 9 (L of RNase Free dH 2 0 diluted cDNA, and store at -20 ° C for later detection. Take the cDNA of each group of cells.
- ⁇ was used as a template, and GAPDH was used as an internal reference.
- Real-time quantitative PCR was used to detect the relative expression of ⁇ -3, and the reaction conditions were set: 95. C 30s, 1 cycle, 54°C 30s 40 cycles, 95. C 5s, 60.
- TIM-3 gene is more than 60-fold higher than that of Jurkat cells, whether it has just been screened or has been cultured for 20 generations of pLVX-TIM-3 cells, whereas pLVX empty vector cells
- the expression level of TIM-3 gene was almost unchanged compared with Jurkat cells, indicating that the TIM-3 gene cDNA sequence provided by the present invention was successfully inserted into the pLVX-IRES-Puro expression vector, and the TIM- can be specifically, continuously, efficiently and stably promoted. 3 gene high expression.
- the lentiviral expression vector which specifically promotes the high expression of the TIM-3 gene provided by the invention has the advantages of high transfection efficiency, low dosage, and can promote the high expression of the TIM-3 gene in a specific, sustained, efficient and stable manner.
- the present invention also provides specific promotion of TIM-
- the construction method of the lentiviral expression vector with high expression of 3 gene has good operation effect, reduces the cost of sequence synthesis, and has low cost.
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Abstract
L'invention porte sur un vecteur d'expression de lentivirus pour favoriser une expression plus élevée des gènes TIM-3, comprenant une séquence fondamentale, une séquence de gène de résistance, une séquence de site de clonage multiple, une séquence de promoteur et une séquence d'ADNc du gène TIM-3 d'un vecteur d'expression pLVX-IRES-puro. Un site de clonage multiple comprend un site de coupure de l'enzyme Spe I et un site de coupure de l'enzyme Not I; la séquence d'ADNc du gène TIM-3 comprend le site de coupure de l'enzyme Spe I, une séquence de codage TIM-3 et le site de coupure de l'enzyme TIM-3. La séquence d'ADNc du gène TIM -3 est insérée vers l'avant dans la séquence de site de clonage multiple.
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003063792A2 (fr) * | 2002-01-30 | 2003-08-07 | The Brigham And Women's Hospital, Inc. | Compositions et methodes associees a tim-3, molecule de surface cellulaire specifique a th1 |
CN103079644A (zh) * | 2010-06-11 | 2013-05-01 | 协和发酵麒麟株式会社 | 抗tim-3抗体 |
-
2016
- 2016-06-16 WO PCT/CN2016/086067 patent/WO2017214943A1/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003063792A2 (fr) * | 2002-01-30 | 2003-08-07 | The Brigham And Women's Hospital, Inc. | Compositions et methodes associees a tim-3, molecule de surface cellulaire specifique a th1 |
CN103079644A (zh) * | 2010-06-11 | 2013-05-01 | 协和发酵麒麟株式会社 | 抗tim-3抗体 |
Non-Patent Citations (2)
Title |
---|
SHE, JING: "The Effect of Tim-3 on TLR/LPS Signalling Pathway in Murine Macrophages", CHINESE MASTER'S THESES FULL-TEXT DATABASE MEDICINE AND HEALTH SCIENCE, 15 April 2014 (2014-04-15), pages 12 - 19 * |
ZHANG, SHENGTAO ET AL.: "Expression of Human T- cell Immunoglobulin Mucin 3(TIM-3) on Eukaryotic Cells and Establishment of Stable Transfectant Cell Line", CHINESE JOURNAL OF CELLULAR AND MOLECULAR IMMUNOLOGY, vol. 21, no. 6, 31 December 2005 (2005-12-31), pages 707 - 709 and 713 * |
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