55 results about "Virus-Retrovirus" patented technology

This invention relates to the fields of genetic engineering, virus replication and gene transfer. More specifically, this invention relates to polynucleotide construct, recombinant virus, transposon, and their vectors, wherein an ori derived from a DNA virus capable of replicating in vertebrate cells is inserted into the retrovirus, allowing the retrovirus following the reverse transcription to efficiently replicate as extrachromosomal or episomal DNA without the necessity of integration into the host cell chromosome. Additionally, this invention relates to polynucleotide construct, recombinant virus, transposon, and their vectors replicating episomally without aid of an ori and related elements. Also, this invention encompasses preventive, therapeutic, and diagnostic applications employing said constructs, viruses and vectors.

Provided herein are Cocal vesiculovirus envelope pseudotyped retroviral vectors that exhibit high titers, broad species and cell-type tropism, and improved serum stability. Disclosed Cocal vesiculovirus envelope pseudotyped retroviral vectors may be suitably employed for gene therapy applications and, in particular, for the ex vivo and in vivo delivery of a gene of interest to a wide variety of target cells.

A method for transferring a gene into target cells by a retrovirus with the use of serum-free medium. This method comprises infecting target cells with a retrovirus in serum-free medium optionally containing low-density lipoprotein and/or cytokines in the presence of a functional substance such as fibronectin in an amount effective in elevating the gene transfer efficiency of the retrovirus into the target cells by co-localizing the retrovirus and the target cells.

The invention includes compositions and methods for regulating PI3K p110 delta as an anti-retroviral therapy. The invention includes inhibiting p110 delta, a component of PI3K p110 delta signaling pathway, or any combination thereof in a cell as an anti-retroviral therapeutic approach for treating a retroviral infection, for example HIV. The invention includes a method of modulating PI3K p110 delta in a cell infected with a retrovirus by contacting the cell with an effective amount of a composition comprising an inhibitor of PI3K p110 delta.

Compounds, compositions, and methods of treatment and prevention of HIV infection are disclosed. The compounds are pyrrolo[2,3-b]pyridines and pyrrolo[2,3-b]pyrimidine JAK inhibitors. Combinations of these JAK inhibitors and additional antiretroviral compounds, such as NRTI, NNRTI, integrase inhibitors, entry inhibitors, protease inhibitors, and the like, are also disclosed. In one embodiment, the combinations include a combination of adenine, cytosine, thymidine, and guanine nucleoside antiviral agents, optionally in further combination with at least one additional antiviral agent that works via a different mechanism than a nucleoside analog. This combination has the potential to eliminate the presence of HIV in an infected patient.

The invention belongs to the field of medicines and particularly relates to a new application of an iridoid glycoside compound, genipin-1-[beta]-D-gentiobioside, and a composition composed by compounding the genipin-1-[beta]-Dgentiobioside with other components as effective components for preparing antiviral drugs, antibacterial drugs, fever alleviating drugs, inflammation resistant drugs and anti-oxidizing drugs. The iridoid glycoside compound and the composition can be used for treating acute respiratory infection, flu, pneumonia, viral hepatitis type B, herpes zoster, herpes viral keratitis, viral myocarditis, Epstein-Barr virus infection, retrovirus infectious diseases and bacterial infectious diseases.

The invention relates to a triazolopyrimidine HIV-1 retrovirus inhibitor and its pharmaceutically acceptable salt, ester or prodrug, its preparation method and an application of one compound or a composition of more compounds in the preparation of anti-AIDS drugs.

The invention discloses a kit with RT-LAMP nucleic acid test strips for detecting a porcine epidemic diarrhea virus and applications of the kit. The kit comprises a primer group of a nucleic acid represented by SEQ ID No. 1-6 and test strips for detection of nucleic acid. The usage of the kit is as follows: first preparing a RT-LAMP reaction system comprising an AMV retrovirus, a 1* reaction buffer, a strand displacement DNA polymerase, a dNTP mixture, betaine, MgSO4, a FIP primer, a BIP primer, a LoopF primer, a LoopB primer, a F3 primer, a B3 primer and RNA of a sample to be measured; carrying out a reaction at a constant temperature, after testing the obtained products by using the nucleic-acid-detecting test strip, judging and reading directly: the positive result is that two red strips appear, and one strip is in the detection zone while the other strip is in the control zone. The kit has advantages of simple operation, low cost, easy observation of the reaction result, good specificity, easy popularization and application in large scope and being extremely suitable for export quarantine, food hygiene and on-site detection in animal husbandry.

The invention provides an establishing method of a recoverable immortalized hepatic cell line. The establishing method comprises the following steps: separating a hepatic progenitor cell from liver in a mouse which is 12.5-14.5 days old in an embryonic period; guiding a retrovirus containing genes SV40T and HSV-TK into the hepatic progenitor cell; screening a monoclonal cell strain having a hepatic progenitor cell marker and having a function of differing to a mature hepatic cell; then guiding a retrovirus containing CD gene into the cell strain so as to obtain recoverable immortalized hepatic cell carrying double suicide genes. The cell strain can multiply in vitro to obtain the phenotype and functions of a normal hepatic cell, the safety of the immortalized cell becomes adjustable through controllable modes such as locus recombination and drug screening; when the cell is used in a human body, the biological safety of the immortalized cell is ensured to the greatest extent and the dangerousness of the immortalized cell is reduced; therefore, a reliable, safe and ideal hepatic cell material is provided for bioartificial liver technology.

The present invention provides a use of a therapeutically effective amount of 6-(3-chloro-2-fluorobenzyl)-1-[(2S)-1-hydroxy-3-methylbutan-2-yl]-7-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (herein referred to as Compound I) or a pharmaceutically acceptable salt thereof, for the production of an agent for the treatment in a patient. The invention further provides a use of Compound I or a salt thereof for an agent for inhibition of integrase activity. Compound I or a salt thereof is also effective in inhibiting the replication of a retrovirus resistant to at least one anti-retroviral drug. In the use of the invention, Compound I or a salt thereof may be administered alone or in combination with at least one anti-retroviral drug other than Compound I or a salt thereof. The present invention also provides kits comprising Compound I or a salt thereof.

The invention discloses a RT-LAMP nucleic acid test strip kit for detection of a porcine reproductive and respiratory syndrome virus, and applications The kit comprises a primer combination with a nucleotide sequence represented by SEQ ID NO. 1-6 and nucleic acid detection test strips. The usage of the kit is as follows: first preparing RT-LAMP reaction system comprising an AMV retrovirus, a 1* reaction buffer, a Bst DNA polymerase, a dNTP mixture, betaine, MgSO4, a FIP primer, a BIP primer, a LoopF primer, a LoopB primer, a F3 primer, a B3 primer, and RNA of a sample to be measured; carrying out a reaction at a constant temperature, after testing the obtained products by using the nucleic-acid-detecting test strip, judging and reading directly: the positive result is that two red strips appear, and one strip is in the detection zone while the other strip is in the control zone. The kit has the advantages of simple operation, low cost, easy observation of the reaction result, good specificity, easy popularization and application in large scope and being extremely suitable for export quarantine, food hygiene and on-site detection in animal husbandry.

The invention belongs to the technical field of biology, and particularly relates to a controllable immortalized retrovirus vector and human umbilical cord mesenchymal stem cell and a construction method thereof. The construction method comprises the steps that a Tet-on 3G system is used for constructing a controllable immortalized retrovirus vector containing immortalized factors, the retrovirusis packaged for infecting the umbilical cord mesenchymal stem cell, expression of the immortalized factor gene is induced by adding an inductor, and the gene is converted into the immortalized cell with the high multiplication capacity; when the cell needs to be used for normal physiologic or disease treatment, the inductor is removed, the immortalized factor gene is in the transcription closed state, the cell recovers the characteristics of a primary umbilical cord mesenchymal stem cell, and the cell has the great important significance in gene function research or disease treatment.

The present invention relates to a pharmaceutical antiretroviral composition comprising lamivudine, festinavir and nevirapine, to a process for preparing such a composition and to the use of such a composition for the treatment and/or prophylaxis of diseases caused by retroviruses, especially acquired immune deficiency syndrome or an HIV infection.

The present invention relates to a nucleic acid construct comprising: (i) a first nucleic acid sequence which either comprises a retroviral transfer vector or which encodes a retroviral protein; and (ii) a second nucleic acid sequence which encodes a detectable marker which is a cell surface protein comprising an extracellular domain and a membrane targeting domain.

A cell for producing retroviral vectors comprising nucleic acid sequences encoding: i) gag-pol; ii) env; iii) the RNA genome of the retroviral vector; and iv) optionally rev, or a functional substitute thereof, wherein at least two nucleic acid sequences are located at the same genetic locus; and wherein the at least two nucleic acid sequences are in reverse and/or alternating orientations.

The invention discloses a microRNA for inhiting expression of Sirt1 of chicken, and also discloses a recombinant over-expression plasmid and specific application of the microRNA, and an LMH cell linefor constructing stable low-expression Sirt1 by utilizing over-expression miRNAs. Compared with the prior art, a target gene is interfered by artificially designed miRNA, and an over-expression vectorof the miRNA is directly and quickly constructed according to a simple PCR technology; pLNCX-pmirG provided by the invention is a very good vector for performing over-expression on the miRNA, retroviruses can be packaged in sequence, the cell line of stable over-expression miRNA can be quickly obtained by combining G418 pressurized screening and green fluorescent protein detecting methods; a reply mechanism of the Sirt1 that affecting the liver to a nutrition state can be disclosed by the research, and a unique hepatocyte subcloning system model is also provided for researching the functionsof human and animal livers in energy metabolism.

Disclosed are compounds that inhibit RNase H activity of retroviruses, for example, a compound of formula (I) wherein R₁, R₂, and R₃ are as described herein, as well as pharmaceutically acceptable salts, solvates, stereoisomers, and prodrugs thereof. Pharmaceutical compositions comprising such compounds, as well as methods of use, and treatment or prevention of infection by human immunodeficiency virus (HIV).

The invention discloses a method for directly determining a non-separated small nucleic acid in a biological sample. The method comprises the following steps: 1, taking the biological sample; 2, adding Ploy A to the 3'-terminal of a small nucleic acid; 2, reverse transcription reaction: adding oligomerized dT with a first primer and retrovirus to generate single strand cDNA with oligomerized T+ and a designed first primer; and 4, PCR amplification of quantitative small nucleic acid: adding a second primer completely or partially complementary to the sequence of the small nucleic acid, and a third primer completely or partially complementary to the first primer, and carrying out PCR to detect the amount of the quantitative small nucleic acid. The content of the small nucleic acid (like siRNA, miRNA, antisense nucleic acid and aptamer) in the biological sample is determined by directly using the biological sample without separating the small nucleic acid in the biological sample.

The invention discloses a pseudovirion particle and a preparation method and application thereof. The pseudovirion particle comprises RNA fragments of a monkey type D retrovirus encapsulated by MS2 phage capsid protein. The preparation method of the pseudovirion particle is simple, operation is easy, fineness of the obtained pseudovirion particle is high, and the pseudovirion particlecan be used as an external standard quality control product of a nuclein detecting method of monkey type D retrovirus detection. The method has the characteristics of high stability and nuclease resistance, a target template sequence exists only in the form of RNA, infectivity is avoided, and security is high.

The invention discloses a retrovirus detection method. The method comprises the following steps: (1) selecting host cells that support the replication of the retrovirus; (2) culturing a sample to be tested with the host cells together; (3) collecting supernate, inoculating an indicating cell line, and detecting whether the supernate is polluted by retrovirus or not. According to the provided method, a co-culture method is used to detect the retrovirus, the sensitivity and specificity of retrovirus detection are greatly improved, compared with the conventional retrovirus detection method, the method can be widely used to detect biological products such as monoclonal antibody, in-vitro diagnosis products, and the like, and the method can also be used to detect the biological safety of the endogenous pollution elimination/inactivation step during the biological product production process.

The present invention relates to a recombinant vector, characterized by including a cytotoxic T-lymphocyte-associated protein-4 (CTLA-4)-targeting trans-splicing ribozyme expression cassette for delivery of chimeric antigen receptor, wherein the expression cassette includes: (i) a CTLA-4-targeting trans-splicing ribozyme; and (ii) a polynucleotide encoding a chimeric antigen receptor ligated to the 3′ exon of the ribozyme. The present invention also relates to a transformed cell into which the recombinant vector is introduced, a ribozyme expressed from the recombinant vector, a retrovirus expressing the ribozyme, and a T cell treated with the retrovirus. Furthermore, the present invention relates to a pharmaceutical composition for preventing or treating cancers, in which the pharmaceutical composition includes the recombinant vector, the transformed cell, the ribozyme, the retrovirus, the T cell, or a combination thereof; and a method for treating cancers, in which the method includes administering, to an individual in need thereof, the recombinant vector, the transformed cell, the ribozyme, the retrovirus, the T cell, or a combination thereof. The recombinant vector of the present invention and the ribozyme expressed therefrom become a gene-cell therapy which inhibits CTLA-4 on T cells which has been an obstacle in conventional anti-cancer therapies and, at the same time, enables anti-cancer treatment, thereby allowing more effective anti-cancer effects to be anticipated. Such a gene-cell therapy results in decreased toxicity in normal tissues and thus exhibits increased effects in both therapeutic efficacy and safety, which enables it to be widely utilized in the field of gene therapy in the future.