title: Improved recombinant retroviral titers utilizing trichostatin A.
abstract: Recombinant retroviruses are a common vehicle to deliver an exogenous gene to a target cell, which makes them a useful tool in the field of gene therapy. A major drawback to using recombinant retroviruses is the low titer achieved, resulting in a limited number of target cells infected and subsequently poor expression of a transgene. In this study, we created an ecotropic producer cell line that contained recombinant mouse nerve growth factor (NGF) and the reporter gene LacZ. This cell line, termed psi 2/LIG/NGF, was treated with the drug trichostatin A, an inhibitor of histone deacetylase. At a concentration of 3 microM trichostatin A, the retroviral titer of this producer cell line was increased 34-fold relative to untreated control cells and 3.4-fold compared to the commonly used hyperacetylating compound sodium butyrate. Producer cells treated with trichostatin A also increased the number of primary rat marrow stromal cells infected 5.8-fold compared to untreated producer cells. These results offer a simple and effective solution for converting low titer producer cell clones to higher titer clones, which can be easily tested and applied.
authors.affiliation: MCP Hahnemann University, Philadelphia, PA, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Tobias
authors.forename: D
authors.initials: D
authors.lastname: Kim
authors.forename: I
authors.initials: I
authors.lastname: Fischer
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002087:Butyrates / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D015316:Genetic Therapy; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids / Q000494:pharmacology*; D051379:Mice; D020932:Nerve Growth Factor / Q000494:pharmacology; D012190:Retroviridae / Q000187:drug effects* / Q000235:genetics
chemical_list: D002087:Butyrates; D004791:Enzyme Inhibitors; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; C012589:trichostatin A; D020932:Nerve Growth Factor