Abstract
Erypoegin K is an isoflavone isolated from the stem bark of Erythrina poeppigiana. It contains a furan group at the A-ring of the core isoflavone structure and can inhibit the activity of glyoxalase I, an enzyme that catalyzes the detoxification of methylglyoxal (MG), a by-product of glycolysis. In the present study, we found that erypoegin K has a potent cytotoxic effect on human leukemia HL-60 cells. Its cytotoxic effect was much stronger than that of a known glyoxalase I inhibitor S-p-bromobenzylglutathione cyclopentyl diester. Conversely, erypoegin K demonstrated weak cytotoxicity toward normal human peripheral lymphocytes. The treatment of HL-60 cells with erypoegin K significantly induced caspase-3 activity, whereas the pretreatment of the cells with caspase-3 inhibitor suppressed erypoegin K-induced cell death. Furthermore, nuclear condensation and apoptotic genome DNA fragmentation were observed in erypoegin K-treated HL-60 cells. These results indicated that the observed cell death was mediated by apoptosis. In addition, the toxic compound MG was highly accumulated in the culture medium of erypoegin K-treated HL-60 cells, suggesting that cell apoptosis was triggered by extracellular MG. The present study showed that erypoegin K has a potent apoptosis-inducing effect on cancerous cell lines, such as HL-60.
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This work was partly supported by a Grant-in-Aid for Scientific Research (C) (JP16K08311) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Hikita, K., Hattori, N., Takeda, A. et al. Potent apoptosis-inducing activity of erypoegin K, an isoflavone isolated from Erythrina poeppigiana, against human leukemia HL-60 cells. J Nat Med 72, 260–266 (2018). https://doi.org/10.1007/s11418-017-1147-9
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DOI: https://doi.org/10.1007/s11418-017-1147-9