Clotam enhances anti-proliferative effect of vincristine in Ewing sarcoma cells.

ABSTRACT: Current therapeutic strategies used in Ewing sarcoma (ES) especially for relapsed patients have resulted in modest improvements in survival over the past 20 years. Combination therapeutic approach presents as an alternative to overcoming drug resistance in metastatic ES. This study evaluated the effect of Clotam (tolfenamic acid or TA), a small molecule and inhibitor of Specificity protein1 (Sp1) and survivin for sensitizing ES cell lines to chemotherapeutic agent, vincristine (VCR). ES cells (CHLA-9 and TC-32) were treated with TA or VCR or TA?+?VCR (combination), and cell viability was assessed after 24/48/72 h. Effect of TA or VCR or TA?+?VCR treatment on cell cycle arrest and apoptosis were evaluated using propidium iodide, cell cycle assay and Annexin V flow cytometry respectively. The apoptosis markers, caspase 3/7 (activity levels) and cleaved-PARP (protein expression) were measured. Cardiomyocytes, H9C2 were used as non-malignant cells. While, all treatments caused time- and dose-dependent inhibition of cell viability, interestingly, combination treatment caused significantly higher response (~?80% inhibition, p?

SUBMITTER: Shelake S 

PROVIDER: S-EPMC6447082 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature