107 results about "Lentivirus Infections" patented technology

The invention discloses a process of knocking out Wnt3a gene and a verification method thereof. The knockout and verification of Wnt3a gene are finished through the following steps: establishment of a Cas9 lentiviral vector for Wnt3a gene, culture and passage of HepG2 cell, lentivirus infection and screening of target cell, verification of gene knockout efficiency through a mispairing enzyme method, cell protein analysis and cell proliferation detection by a CCK-8 method. The invention has the following advantages: the Wnt3a gene is knocked out by establishing a Cas9 double-vector lentivirus system for the first time; Crispr/Cas9 is a technology for accurately editing specific site of the genome of any species, and the cell-level single gene or multiple genes can be knocked out by the technology; compared with other gene editing technologies, the method has the advantages that the targeting accuracy is higher; only if the RNA target sequence is completely matched with the genome sequence, can the Cas9 cut the DNA and realize simultaneous knockout of multiple sites of the target gene; and moreover, the experimental period of vector establishment is short, the time and the cost are remarkably saved, and species limit is avoided.

The invention discloses a CRISPR/Cas9 targeted knockout human colorectal carcinoma cell DEAF1 gene and specific sgRNA thereof. The CRISPR/Cas9 targeted knockout human colorectal carcinoma cell DEAF1 gene and the specific sgRNA thereof are characterized in that: firstly, sgRNA of a second exon of the specific targeted DEAF1 gene is obtained and the base sequence of the sgRNA is shown as SEQ ID NO.1; secondly, the sgRNA of the DEAF1 gene is constructed into a lentiviral vector system, which contains Cas9 protein; finally, the CRISPR/Cas9 lentivirus containing the sgRNA is infected with human colorectal carcinoma cell HT-29 cell, so that a cell strain of which DEAF1 protein expression level is obviously reduced is obtained. The CRISPR/Cas9 targeted knockout human colorectal carcinoma cell DEAF1 gene disclosed by the invention has the advantages of simple operation steps, good sgRNA target ability and high cutting efficiency for the DEAF1 gene; in addition, the constructed CRISPR/Cas9 lentiviral vector system has the advantage of high knockout efficiency and can specifically knock out the DEAF1 gene to obtain the human colorectal carcinoma cells knocking out the DEAF1 gene, and therebya powerful tool is provided for further studying an action mechanism of DEAF1 in the colorectal carcinoma cells.

The invention discloses a CRISPR-Cas9 targeted-knockout human colorectal cancer cell PPP1R1C gene and a specific sgRNA sequence. The invention comprises the following steps: firstly, acquiring sgRNA of a specific targeting PPP1R1C gene functional area, wherein a base sequence of the sgRNA is shown as SEQ ID NO.1; then, constructing an sgRNA-lentiviral vector system of the PPP1RQC gene, wherein thesystem contains Cas9 protein; and finally, infecting human colorectal cancer HT-29 cells with CRISPR/Cas9 lentivirus containing the sgRNA, so that a cell line that a PPP1R1C protein expression levelis obviously reduced is obtained. The invention is simple in operating steps, good in sgRNA targeting performance and high in cutting efficiency on the PPP1R1C gene; the constructed CRISPR/Cas9 lentiviral system is high in knockout efficiency and is capable of achieving specific knockout of the PPP1R1C gene, so that the human colorectal cancer cells that the PPP1R1C gene is knocked out is obtained; therefore, a powerful tool is provided for further researching an action mechanism of the PPP1R1C in the colorectal cancer cells.

The present invention generally relates to the field of antiviral therapy. More specifically, the present invention relates to the inhibition of the tRNA^Lys3-primed initiation of reverse transcription in viruses by APOBEC3G. The present invention further relates to a method of treating or preventing viral infections by inhibiting tRNA^Lys3 annealing and/or priming on a viral genome thereby reducing viral replication. More particularly, the present invention relates to the use of APOBEC3G, fragments or derivatives thereof for treatment or prophylaxis of HIV-1 infection and related lentivirus infections.

The invention relates to a CAR-NK cell as well as a preparation method and an application thereof. The method comprises the following steps: S1, linking a specific antibody coding gene into a cloning site region of a modified CAR skeleton so as to obtain a CAR gene, wherein the modified CAR skeleton comprises a CD244 episporium signal region, the cloning site region, a CD244 extracellular hinge region, a CD244 transmembrane part region and a CD244 intracellular part region which are sequentially connected; and S2, infecting the CAR gene with NK cell through lentivirus, so that the NK cell expressing the CAR protein is obtained, namely the CAR-NK cell. The prepared tumor immnuotherapy cell, namely the CAR-NK cell, of the invention, besides a patient with cancer, is also applicable to allosome infusion; therefore, the prepared tumor immnuotherapy cell, in comparison with existing CAR-T, is wider in application scope and is lower in preparation cost.

The invention relates to a building method of a cell strain for stably expressing NS1 (non-structural 1) protein. An NS1 gene is inserted in an EcoR I polyclone site of a pLenti-CMV-EGFP-3Flag-PGK-Puro carrier; a built pLenti-CMV-NS1-EGFP-3Flag-PGK-Puro recombinant plasmid and a virus packaging plasmid are used for 293T cell cotransfection; culture, toxin elimination, virus liquid supernatant collection and filtering are performed to obtain recombinant lentivirus liquid. Packaged recombinant lentivirus infection A549 cells are subjected to puromycin screening, immunofluorescence and Western blot identification to obtain the cell strain for stably expressing NS1 protein. A recombinant lentivirus system is used for preparing the cell strain fusing tag protein capable of stably expressing the NS1 protein. The cell strain provides a good tool for studying the biological function of the NS1 protein.

The present invention provides methods of identifying an agent that inhibits an activity of a lentiviral Vif protein. The present invention provides methods of identifying an agent that increases the level of active APOBEC3G in a cell. The present invention provides agents identified by a subject screening method; and further provides methods for treating lentivirus infections.

The invention relates to an A549 nude mouse model of stably expressed luciferase and building and application thereof. The nude mouse model leads firefly luciferase genes to human lung adenocarcinoma A549 cell strains through the gene recombination technology and lentivirus infection, tumor clone cell strains of the stably expressed luciferase are obtained through subcloning screening, and recombinational A549 cells are inoculated in a mouse to obtain the A549 nude mouse model. Compared with a traditional tumor model drug effect detection method, the A549 nude mouse model enables observation to be visual and convenient, can be used for somatoscopy without damaging animals, is reliable in result, and has good application prospect.

The invention relates to the technical field of NK cell in-vitro amplification, in particular to a NK cell transfection efficiency improving method. In lentivirus infection of NK cells, an auxiliary infection agent 1 is added while a CAR-containing lentivirus carrier is added in primary infection; an auxiliary infection agent 2, an auxiliary infection agent 3 and an auxiliary infection agent 4 areadded while a CAR-containing lentivirus carrier is added in secondary infection; the auxiliary infection agent 1 refers to polybrene solution, the auxiliary infection agent 2 refers to IL2 solution,the auxiliary infection agent 3 refers to IL12 solution, and the auxiliary infection agent 4 refers to PHA solution. According to a Car-NK transfection method, different auxiliary infection agents areadded in a transfection process, NK cell transfection efficiency is imiproved, and NK cell lentivirus transfection efficiency can be improved from less than 10% to 50%-60%.

The invention discloses an immortalized yak rumen epithelial cell line and a construction method thereof. The preservation number of the cell line is CCTCC No. C2021245, and the cell line is classified and named as the immortalized yak rumen epithelial cell line SV40T-YREC-hTERT. The method comprises the following steps: performing adherent culture on tissue digested by primary yak rumen epithelial papilla type I collagenase to obtain primary rumen epithelial cells; with the cells as host cells, infecting the cells with lentiviruses carrying SV40T and hTERT genes; and performing screening and enlarged culture to obtain the immortalized yak rumen epithelial cell line. Through the establishment of the cell line, the defects that the primary rumen epithelial cells are difficult to culture and the number of passage times is limited are overcome, and yak source cell line resources are enriched; and the cell line can be stably passaged, can keep the morphological characteristics and normal functions of the primary rumen epithelial cells, and provides a useful in-vitro cell model for researching rumen epithelial nutrition digestion, absorption and metabolism, cell signal path mechanisms and the like.

This invention discloses compositions that consist essentially of a Gag polypeptide or at least one portion thereof, and optionally antigen-presenting cells or their precursors, for treating or preventing lentiviral infections including the treatment or prevention of related acquired immunodeficiency diseases. In certain embodiments, the compositions consist essentially of a plurality of overlapping and/or non-overlapping peptides derived from a single Gag polypeptide or from different Gag polypeptides.

The invention relates to the technical field of genetic engineering, in particular to a lentiviral vector and application thereof in construction of immortalized cells. According to the invention, bymeans of lentivirus infection, different immortalized key genes are selectively and targetedly integrated into a target cell genome, thus not only improving the immortalization efficiency, but also generating no harmful by-product in the cells. Because of simultaneous introduction of two immortalized genes, the plasmid vector has expanded application scope, can be applicable to more cell types, also the two groups of genes have different mechanisms in inducing immortalization, can complement each other to improve the immortalization efficiency. By adding an inducible promoter, TERT expressioncan be controlled by an inducer, the cell canceration probability is reduced, and the immortalization process of cells can be better controlled.

The invention provides an MSCs (mesenchymal stem cells) line for stable expression of EX-4. The MSCs line for stable expression of EX-4 is obtained by lentivirus infection. The lentivirus used by the invention is obtained by transfection of 293T cells with a PLVTH-pol-IRES-puro lentivirus overexpression system, and the lentivirus overexpression system comprises PLVTH-EX-4 expression plasmid, coating plasmid pMD2.G, and packaging plasmid p8.91. The PLVTH-EX-4 is obtained by double enzyme digestion of the lentivirus overexpression vector plasmid PLVTH-pol-IRES-puro and EX-4 target gene and then connection to T4 ligase. The cell line obtained by the invention on the one hand can enhance the anti anti-apoptosis ability, multiplication capacity and migration ability of MSCs itself, and on the other hand the EX-4 overexpressed MSCs group has better effects of inhibiting apoptosis and promoting proliferation on pancreatic beta cells than the MSCs group. Through the two aspects of effects, the cell line provided by the invention can recover the functions of pancreatic beta cells to a normal level, and improve the disadvantages of MSCs in treatment of diabetes.

The present invention provides methods and compositions for optimally co-expressing in a primate subject a tyrosylprotein sulfotransferase (TPST) and a lentiviral gp120-binding molecule to provide potent and long term protection against lentiviral infections.

The invention discloses an NS5B303shRNA (Short Hairclip Ribonucleic Acid) for inhibiting hog cholera virus replication. The NS5B303shRNA contains a siRNA (Small Interfering Ribonucleic Acid) sequence and is prepared through constructing a lentiviral expression vector of a shRNA, obtaining replication deficient lentivirus and lentivirus infection PK-15 cells (pig kidney cells) and verifying a hog cholera virus replication inhibiting effect. The sequence has a remarkable effect for inhibiting the replication of hop cholera viruses on sensitive cells. Through research on RNA interference to replication inside/outside the hog cholera viruses, a lentiviral vector mediated and stably-integrated RNA interfering technology for targeting a specific conserved gene fragment of a hog cholera virus genome is constructed, and siRNA transgenic animals for targeting the siRNA of hop cholera viruses are expected to be constructed. The necessary experimental data are accumulated for researching gene functions of the shRNA applied to the hop cholera viruses and preventing and treating hog cholera, and the previous preparation is provided for the animal breeding for disease resistance.

The invention provides application of a CRISPR (clustered regularly interspaced short palindromic repeats) gene editing technology in treatment of thalassemia. A CRISPR system in the application comprises at least one nuclease and at least one sgRNA, the sgRNA can target an inhibiting element of an HBG (gamma globin gene) promoter; the nuclease can cut the inhibiting element of the HBG promoter, the sgRNA comprises a targeting sequence targeting the inhibiting element of the HBG promoter, and the targeting sequence comprises a sequence as shown in SEQ ID No.1 or a complementary sequence as shown in SEQ ID No.1. Transferring a compound of the nuclease and the sgRNA into a cell by an electrotransformation method can knock out the inhibiting element on the HBG (gamma globin gene) promoter, and the relative content of HBG mRNA in cells is improved, and compared with a traditional lentiviral infection technology, exogenous DNA random integration caused by viruses is avoided, and the prospect of clinical application is improved.

The present invention provides screening methods for identifying a compound that induces loss of the lentiviral protein Vpr; screening methods for identifying compounds that inhibit the peptidyl-prolyl cis/trans isomerase (PPIase) activity of a protein that catalyzes cis-trans isomerization of cis-peptidylprolyl bonds in Vpr; and compounds identified by the screening methods. The compounds are useful for treating a lentiviral infection. The present invention further provides methods of inducing loss of the lentiviral protein Vpr; methods of inhibiting lentivirus viral replication; and methods of treating a lentivirus infection in an individual. The methods generally involve administering to an individual infected with the lentivirus an effective amount of a compound that induces Vpr loss and/or that inhibits PPIase activity of a protein that catalyzes cis-trans isomerization of cis-peptidylprolyl bonds in Vpr.

The present invention relates to therapeutic compositions of macrophage derived chemokine (MDC) and methods for treating and preventing infection by a lentivirus, particularly an immunodeficiency virus, particularly HIV, using MDC proteins, nucleic acids and/or derivatives or analogues thereof. The present invention further relates to methods for detection and prognosis of lenivirus infection, particularly HIV infection using MDC as a prognostic indicator. The present invention further provides MDC proteins, nucleic acids encoding such proteins, that have amino-terminal sequences that differ from other MDC isolates. Recombinant host cells and methods of production are also provided.

The invention discloses a method of establishing a hepatitis B virus infection cell model by using porcine primary hepatocyte and hNTCP recombinant lentivirus and belongs to the technical field of cell modification. The method comprises the following steps: S1, preparing an hNTCP recombinant lentivirus concentrated liquid; S2, preparing liver tissues which are fully digested; S3, preparing the porcine primary hepatocyte; S4, preparing a porcine primary hepatocyte single cell suspension; S5, preparing a cell suspension for paving a plate; S6, paving cell plate and culturing; S7, carrying out hNTCP recombinant lentivirus infection on the porcine primary hepatocyte; and S8, establishing the hepatitis B virus infection cell model. According to the invention, the recombinant lentivirus containing an hNTCP gene is constructed in vitro, the hNTCP gene is integrated into the primary hepatocyte genome through the lentivirus with high efficiency of infection to achieve stable overexpression of hNTCP, so that the primary hepatocyte supports hepatitis B virus infection.

The invention provides a preparation method of CAR-T cells. According to the method, an Akt inhibitor MK2206 is added to both T lymphocyte activation and lentivirus infection, the CAR positive rate ofthe obtained CAR-T cells is significantly improved, and the ratio of memory cells is greatly improved, so that the terminal differentiation is delayed, and the survival condition in vivo is significantly improved. Under the condition that the killing capability is detected undamaged in vitro, the differentiation is delayed, and the CAR expression positive rate is increased. The CAR-T cells are better in the survival state in vivo. The treatment effect is better, and broad application prospects and great market value are achieved.

The invention discloses an immortalized porcine macrophage cell strain as well as a construction method and an application thereof, and belongs to the technical field of bioengineering. The immortalized porcine macrophage cell strain provided by the invention is obtained by co-transfecting immortalized genes SV40LT and hTERT into primary porcine bone marrow-derived macrophages in a lentivirus infection manner, the provided immortalized porcine macrophage cell strain is suitable for culturing African swine fever virus, can obtain high virus titer, is reliable and stable, can be continuously passed, and can be effectively applied to immunological research in the aspect of resisting African swine fever virus infection and production of African swine fever virus vaccines.

The invention relates to a luciferase gene-Lewis lung carcinoma (Luc-LLC) tumor model used for evaluating drug treating effects and establishment of the Luc-LLC tumor model and applications of the Luc-LLC tumor model. According to the Luc-LLC tumor model, a firefly luciferase gene is introduced into human LLC cell lines by adoption of a gene recombination technology and a lentivirus infection, tumor cloned cell lines capable of translating the luciferase is acquired through subcloning selection, and then recombinant LLC cells are adopted to be inoculated in small mice, and the Luc-LLC tumor model is constructed. Compared with evaluating methods of a traditional tumor model used for evaluating the drug treating effects, the t Luc-LLC umor model is more intuitive and convenient to observe, vive-observation can be carried out, animals are not damaged, result is more reliable, and the Luc-LLC tumor model is good in application prospects .