Title:Selective Cytotoxic Effects of 5-Trifluoromethoxy-1H-indole-2,3-dione 3-Thiosemicarbazone
Derivatives on Lymphoid-originated Cells
Volume: 22
Issue: 2
Author(s): Ferdane Danışman-Kalındemirtaş*, Serap Erdem-Kuruca, Kadriye Akgün-Dar, Zeynep Karakaş, Özge Soylu and Nilgün Karali
Affiliation:
- Istanbul University, Istanbul Faculty of Medicine, Department of Physiology, 34104 Capa, Istanbul, Turkey
Keywords:
5-trifluoromethoxy-1H-indole-2, 3-dione, thiosemicarbazone, cytotoxicity, leukemia, lymphoma, chemotherapy.
Abstract: Aim: The present study aims to identify the anticancer effect of novel 1H-indole-2,3-dione 3-
thiosemicarbazone derivatives. These compounds could be promising anticancer agents in leukemia treatment.
Background: Conventional chemotherapeutic agents accumulate in both normal and tumor cells due to nonspecificity.
For effective cancer treatment, new drugs need to be developed to make chemotherapeutics selective
for cancer cells. The ultimate goal of cancer treatment is to reduce systemic toxicity and improve the quality of
life.
Methods: In this study, the anticancer effects of 5-trifluoromethoxy-1H-indole-2,3-dione 3-thiosemicarbazone
derivatives (A-L) were investigated in chronic myelogenous leukemia K562, Burkitt’s lymphoma P3HR1, acute
promyelocytic leukemia HL60 cells, and vincristine-resistant sublines of K562 and P3HR1 cells. Additionally,
the compounds were tested on lymphoid-derived cells from ALL patients. In order to investigate the particular
mechanism of death caused by the cytotoxic effects of the compounds, immunohistochemical caspase 3 staining
was performed in P3HR1 cells, and the resulting apoptotic activities were demonstrated.
Results: All tested compounds have been found to have cytotoxic effects against lymphoma cells at
submicromolar concentrations (IC50= 0.89-1.80 μM). Most compounds show significant selectivity for the
P3HR1 and P3HR1 Vin resistance. The most effective and selective compound is 4-bromophenyl substituted
compound I (IC50=0.96 and 0.89 μM). Cyclohexyl and benzyl substituted compounds D and E have also been
found to have cytotoxic effects against K562 cell lines (IC50=2.38 μM), while the allyl substituted compound C is
effective on all cell lines (IC50=1.13-2.21 μM). 4-Fluorophenyl substituted F compound has been observed to be
effective on all cells (IC50=1.00-2.41 μM) except K562 cell. Compound C is the only compound that shows
inhibition of HL-60 cells (IC50= 1.13 μM). Additionally, all compounds exhibited cytotoxic effects on lymphoidderived
cells at 1μM concentration. These results are in accordance with the results obtained in lymphoma cells.
Conclusion: All compounds tested have submicromolar concentrations of cytotoxic effects on cells. These
compounds hold potential for use in future treatments of leukemia.