Abstract:
The disclosure relates to a switchable aptamer having a high affinity for a selected target such as a virus, cell or antibody when in the presence of a binding ion and a low affinity for said target in the absence of said binding ion. The switchable aptamer may be isolated or selected from a pool comprising a mixture of aptamers by incubating the pool with the target ligand and a binding ion to form target-aptamer complexes; separating unbound aptamer molecules from the target-aptamer complexes; contacting the target-aptamer complexes with a chelating agent having affinity for the binding ion wherein a switchable aptamer specific to said target is released from the target-aptamer complexes; and isolating the switchable aptamer released in the preceding step.
Abstract:
The disclosure relates to a switchable aptamer having a high affinity for a selected target such as a virus, cell or antibody when in the presence of a binding ion and a low affinity for said target in the absence of said binding ion. The switchable aptamer may be isolated from a pool comprising a mixture of aptamers by incubating the pool with the target ligand and a binding ion to form target-aptamer complexes; separating unbound aptamer molecules from the target-aptamer complexes; contacting the target-aptamer complexes with a chelating agent having affinity for the binding ion wherein a switchable aptamer specific to said target is released from the target-aptamer complexes; and isolating the switchable aptamer released in the preceding step.
Abstract:
Provided are viral sensitizing compounds that enhance the efficacy of viruses by increasing spread of the virus in cells, increasing the titer of virus in cells, or increasing the cytotoxicity of virus to cells. Other uses, compositions and methods of using same are also provided.
Abstract:
Novel purification processes for obtaining vesicular stomatitis virus (VSV) of improved purity from mammalian cell culture are described herein. More particularly, in certain embodiments, a process is described for purifying VSV from cell culture fluid of a mammalian cell culture infected with VSV, the process comprising: clarifying the cell culture fluid by low-speed centrifugation and recovering the VSV in the supernatant; filtering the supernatant through a 0.2 to 0.45 μm filter and recovering the VSV in the filtered solution; loading the VSV filtered solution onto a anion exchange membrane adsorber equilibrated with a first pH buffered salt solution, eluting the VSV from the anion exchange membrane adsorber with a second pH buffered salt solution and recovering the eluted VSV fractions; purifying the recovered VSV by tangential flow filtration (TFF) using a TFF membrane having a molecular weight cutoff between 300 kDa and 1,000 kDa and recovering the VSV in the retentate, and filtering the VSV retentate through a 0.2 to 0.22 μm filter and recovering the VSV in the filtered solution.
Abstract:
A Vero cell line that can be grown in serum-free and protein-free culture and in suspension culture in the absence of supporting materials for its adherence, a process to obtain said Vero cell line and a process for producing viral vaccines with said cell line, a virus obtainable by said process and vaccines formulated by said virus.
Abstract:
Provided herein are fumaric-containing compounds, compositions comprising the same and methods for using such compounds for increasing the capacity of an interferon-sensitive virus to infect, transduce, grow or replicate in a cell or spread within one or more tissues. Also provided are methods for increasing the capacity of an interferon-sensitive virus to produce a virus-encoded transgene from a cell, by administering the compounds and compositions.
Abstract:
The present invention relates to a method for rescue of Vesicular Stomatitis Virus (VSV) from DNA in a HEK293 cell line or a HEK293 cell line adapted to suspension growth comprising (a) providing cells from a HEK293 cell line or a HEK293 cell line adapted to suspension growth in cell culture, (b) transfecting the cells with at least one plasmid, wherein the at least one plasmid comprises (i) an expression cassette comprising a VSV genomic cDNA; (ii) at least one expression cassette encoding VSV nucleoprotein (N) protein, VSV phosphoprotein (P) protein, and VSV large (L) protein; and (iii) an expression cassette encoding SV40 Large T antigen; (c) culturing the transfected cells; and (d) harvesting the cell culture supernatant comprising the rescued VSV. Also provided is the use of a HEK293 cell line or a HEK293 cell line adapted to suspension growth for rescue of Vesicular Stomatitis Virus (VSV) or the use of a plasmid encoding SV40 Large T antigen for rescue of Vesicular Stomatitis Virus (VSV) in a HEK293 cell line or a HEK293 cell line adapted to suspension growth HEK293-F cells by means of transient transfection.
Abstract:
Described herein is a method of enhancing virus replication in permissive cells that express a receptor to FGF2 protein. The method includes administering FGF2 protein or a functional variant thereof and the virus to the permissive cells. An oncolytic virus having a genome that includes an open reading frame that encodes FGF2 protein or a functional variant thereof is also described.
Abstract:
Provided are viral sensitizing compounds that enhance the efficacy of viruses by increasing spread of the virus in cells, increasing the titer of virus in cells, or increasing the cytotoxicity of virus to cells. Other uses, compositions and methods of using same are also provided.
Abstract:
A process is described for purifying vesicular stomatitis virus (VSV) from cell culture fluid of a mammalian cell culture infected with VSV, the process comprising: clarifying the cell culture fluid by low-speed centrifugation and recovering the VSV in the supernatant; filtering the supernatant through a 0.2 to 0.45 μm filter and recovering the VSV in the filtered solution; loading the VSV filtered solution onto a anion exchange membrane adsorber equilibrated with a first pH buffered salt solution, eluting the VSV from the anion exchange membrane adsorber with a second pH buffered salt solution and recovering the eluted VSV fractions; purifying the recovered VSV by tangential flow filtration (TFF) using a TFF membrane having a molecular weight cutoff between 300 kDa and 1,000 kDa and recovering the VSV in the retentate, and filtering the VSV retentate through a 0.2 to 0.22 μm filter and recovering the VSV in the filtered solution.