Abstract:
:Erypoegin K, an isoflavone isolated from the stem bark of Erythrina poeppigiana, has a single chiral carbon in its structure and exists naturally as a racemic mixture. Our previous study showed (S)-erypoegin K selectively exhibits potent anti-proliferative and apoptosis-inducing activity against human leukemia HL-60 cells. To identify the target molecule of (S)-erypoegin K, we employed the human cancer cell panel analysis (termed JFCR39) coupled with a drug sensitivity database of pharmacologically well-characterized drugs for comparison using the COMPARE algorithm. (S)-erypoegin K exhibited a similar profile to that of etoposide, suggesting the molecular target for erypoegin K may be topoisomerase II (Topo II). Subsequent experiments using purified human Topo IIα established that the (S)-isomer selectively stabilizes the cleavage complex composed of double-stranded plasmid DNA and the enzyme. Moreover, (S)-erypoegin K inhibited decatenation of kinetoplast DNA. Molecular docking studies clearly indicated specific binding of the (S)-isomer to the active site of Topo IIα involving hydrogen bonds that help stabilize the cleavage complex. (S)-erypoegin K displayed potent cytotoxic activity against two human gastric cancer cells GCIY and MKN-1 with IC50 values of 0.270 and 0.327 μM, respectively, and induced enzyme activities of caspase 3 and 9. Cell cycle analysis showed marked cell cycle arrest at G2 phase in both cell lines. (S)-erypoegin K also displayed significant antitumor activity toward GCIY xenografted mice. The present study suggests (S)-erypoegin K acts as a Topo II inhibitor to block the G2/M transition of cancer cells.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Hikita K,Yamakage Y,Okunaga H,Motoyama Y,Matsuyama H,Matsuoka K,Murata T,Nakayoshi T,Oda A,Kato K,Tanaka H,Asao N,Dan S,Kaneda Ndoi
10.1016/j.bmc.2020.115904subject
Has Abstractpub_date
2021-01-15 00:00:00pages
115904eissn
0968-0896issn
1464-3391pii
S0968-0896(20)30734-3journal_volume
30pub_type
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