Abstract
Trichostatin A (TSA) is a potent histone deacetylase inhibitor and has demonstrated significant antitumor activity against a variety of cancer cell lines. Type I interferons have also shown significant antitumor as well as antiangiogenic activity. In this study, we examined the effectiveness of combination therapy of TSA and interferon beta (IFN-beta) on human neuroblastoma cells in vitro and in vivo using a murine model of retroperitoneal neuroblastoma. For in vitro experiments, plated human neuroblastoma cells (NB-1643 and NB-1691) were treated with vehicle or with IFN-beta, TSA, or both for 24 hours. Cytotoxicity was assessed by counting cells and expressing the results as a percentage of controls. Expression of the tumor suppressor p21(Waf1) was assessed by Western blot. For in vivo experiments, retroperitoneal neuroblastomas were established in severe combined immune deficiency (SCID) mice. Interferon beta was given using a gene therapy approach, administering 1.5 x 10(10) particles of an adeno-associated virus vector encoding human IFN-beta (AAV hIFN-beta) via tail vein as a single dose per mouse. Trichostatin A was given at a dose of 5 mg/kg every 48 hours subcutaneously. Treatment groups included controls, AAV hIFN-beta...Continue Reading
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