title: Differential effects of trichostatin A on gelatinase A expression in 3T3 fibroblasts and HT-1080 fibrosarcoma cells: implications for use of TSA in cancer therapy.
abstract: Trichostatin A (TSA) is a histone deacetylase (HDAC) inhibitor with potential in cancer therapeutics. In a recent communication, we demonstrated that TSA is a selective, potent inhibitor of gelatinase A in 3T3 fibroblasts. In the present study, we extend these observations and examine the effects of TSA in 3T3 fibroblasts compared to HT-1080 fibrosarcoma cells with respect to gelatinase A expression, cell viability, and apoptosis. We find that while expression of gelatinase A in 3T3 fibroblasts is exquisitely sensitive to inhibition by TSA, expression of this enzyme in HT-1080 cells is minimally affected by this compound. Moreover, we show that TSA is pro-apoptotic in HT-1080 cells, but is anti-apoptotic in 3T3 cells. We propose a two-pronged model for the therapeutic action of TSA. On the one hand TSA selectively decreases cancer cell viability, while enhancing the viability of stromal cells. On the other hand, by selectively decreasing gelatinase A expression in stromal but not cancer cells, TSA acts to control metastatic potential by reducing the ability of metastatic cells to recruit stromal cells to secrete gelatinase A.
authors.affiliation: CIHR Group in Membrane Biology, Department of Medicine, Medical Science Building, Room 7207, University of Toronto, Ont., Canada.
authors.forename: Menachem
authors.initials: M
authors.lastname: Ailenberg
authors.forename: Mel
authors.initials: M
authors.lastname: Silverman
mesh_terms: D016475:3T3 Cells; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005347:Fibroblasts / Q000187:drug effects* / Q000201:enzymology; D005354:Fibrosarcoma / Q000473:pathology; D015870:Gene Expression / Q000187:drug effects*; D006877:Hydroxamic Acids / Q000494:pharmacology*; D020778:Matrix Metalloproteinase 2 / Q000096:biosynthesis*; D051379:Mice; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004791:Enzyme Inhibitors; D006877:Hydroxamic Acids; C012589:trichostatin A; D020778:Matrix Metalloproteinase 2