Abstract
Curine is a natural alkaloid isolated from Chondrodendron platyphyllum and it has been reported that this alkaloid has vasodilatory and anti-inflammatory effects. The aim of this study is to analyze the cytotoxic effects of curine in cancer cell lines HL-60, K562, and HT-29, and in primary cultures of peripheral blood mononuclear cells (PBMC). Cells were treated with curine (from 3 to 15 µM) for 24 and 48 h. Cell viability was analyzed by the 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test and flow cytometry with propidium iodide (PI) assay. To assess the type of cell death induced in HL-60, the cell cycle, morphological, and biochemical alterations were analyzed, which were determined by differential staining with acridine orange/ethidium bromide, and annexin V/PI double-labeling and change in mitochondrial membrane potential assays. Curine demonstrated a potent cytotoxic effect on leukemic cell lines (HL-60 and K562). Its cytotoxic effects in HL-60 cells was related to plasma membrane damage and cell cycle arrest at the G1 phase from 43.4 ± 1.0 to 56.7 ± 1.4 % (p < 0.05). Curine (15 μM) also increased the apoptotic cells number by around 60 % in HL-60 cells and caused phosphatidylserine externalization, inducing about 57 % of apoptosis. Moreover, this alkaloid provoked 20 % of mitochondrial membrane depolarization. We conclude that curine presented a cytotoxic effect and induced apoptosis in HL-60 cells. Thus, it can be considered a promising pharmacological drug.
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This research was supported by grants from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).
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Dantas, B.B., Faheina-Martins, G.V., Coulidiati, T.H. et al. Effects of curine in HL-60 leukemic cells: cell cycle arrest and apoptosis induction. J Nat Med 69, 218–223 (2015). https://doi.org/10.1007/s11418-014-0881-5
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DOI: https://doi.org/10.1007/s11418-014-0881-5