Table A and B, in vitro synergy of romidepsin and pralatrexate (PDX) in TCL cell lines. Table A and B, in vitro synergy of romidepsin and pralatrexate.

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Table A and B, in vitro synergy of romidepsin and pralatrexate (PDX) in TCL cell lines. Table A and B, in vitro synergy of romidepsin and pralatrexate (PDX) in TCL cell lines. HTS procedure was used to explore the combination of romidepsin and pralatrexate in vitro in TCL cell lines H9 and HH. Romidepsin was dosed at 0.002 μmol/L and pralatrexate was dosed in a range of 0.02 to 1 μmol/L after testing 10 different concentrations of each drug. Based on the excess over bliss model, values >10 were suggestive of synergistic effect of combination versus additive. Each value reported is the average of at least 3 independent experiments run in triplicate. H9 cell line demonstrated synergy at 48 hours, whereas HH exhibited synergistic effect at 72 hours as exhibited in Tables A and B, respectively. *There was no observed difference of the combination at 24 hours compared with any of the single-drug treatments. C, Heatmap showing quantitative PCR analysis of RNA expression following romidepsin and pralatrexate. Response of genes with potential impact on pralatrexate sensitivity or resistance is shown. Positive controls, B1 [ABCB1 (ATP-binding cassette, sub-family G, member 1) or MDR1 (multi-drug resistance gene)], FOS (Proto-oncogene c-FOS), and p21, often found upregulated in response to romidepsin (Romi), are shown for each cell line. Genes with potential impact on pralatrexate intracellular retention or resistance: ABCG2 (ATP-binding cassette, sub-family G, member 2), GGH, FPG, DHFR, and RFC. Scale is shown next to the figure ranging from X to X-fold induction. Salvia Jain et al. Clin Cancer Res 2015;21:2096-2106 ©2015 by American Association for Cancer Research