2024-03-29T08:34:19Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00030090
2023-11-16T02:43:16Z
499:508:509:2504
Vaticanol C, a phytoalexin, induces apoptosis of leukemia and cancer cells by modulating expression of multiple sphingolipid metabolic enzymes
Inoue, Chisato
Sobue, Sayaka
Mizutani, Naoki
Kawamoto, Yoshiyuki
Nishizawa, Yuji
Ichihara, Masatoshi
Takeuchi, Toshiyuki
Hayakawa, Fumihiko
Suzuki, Motoshi
Ito, Tetsuro
Nozawa, Yoshinori
Murate, Takashi
open access
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
vaticanol C
apoptosis
sphingolipid rheostat
SPHK
GCS
Resveratrol (RSV) has recently attracted keen interest because of its pleiotropic effects. It exerts a wide range of health-promoting effects. In addition to health-promoting effects, RSV possesses anti-carcinogenic activity. However, a non-physiological concentration is needed to achieve an anti-cancer effect, and its in vivo bioavailability is low. Therefore, the clinical application of phytochemicals requires alternative candidates that induce the desired effects at a lower concentration and with increased bioavailability. We previously reported a low IC50 of vaticanol C (VTC), an RSV tetramer, among 12 RSV derivatives (Ito T. et al, 2003). However, the precise mechanism involved remains to be determined. Here, we screened an in-house chemical library bearing RSV building blocks ranging from dimers to octamers for cytotoxic effects in several leukemia and cancer cell lines and their anti-cancer drug-resistant sublines. Among the compounds, VTC exhibited the highest cytotoxicity, which was partially inhibited by a caspase 3 inhibitor, Z-VAD-FMK. VTC decreased the expression of sphingosine kinase 1, sphingosine kinase 2 and glucosylceramide synthase by transcriptional or post-transcriptional mechanisms, and increased cellular ceramides/dihydroceramides and decreased sphingosine 1-phosphate (S1P). VTC-induced sphingolipid rheostat modulation (the ratio of ceramide/S1P) is thought to be involved in cellular apoptosis. Indeed, exogenous S1P addition modulated VTC cytotoxicity significantly. A combination of SPHK1, SPHK2, and GCS chemical inhibitors induced sphingolipid rheostat modulation, cell growth suppression, and cytotoxicity similar to that of VTC. These results suggest the involvement of sphingolipid metabolism in VTC-induced cytotoxicity, and indicate VTC is a promising prototype for translational research.
Nagoya University Graduate School of Medicine, School of Medicine
2020-05
eng
departmental bulletin paper
VoR
https://doi.org/10.18999/nagjms.82.2.261
http://hdl.handle.net/2237/00032276
https://nagoya.repo.nii.ac.jp/records/30090
10.18999/nagjms.82.2.261
http://www.med.nagoya-u.ac.jp/medlib/nagoya_j_med_sci/822.html
2186-3326
0027-7622
Nagoya Journal of Medical Science
82
2
261
280
https://nagoya.repo.nii.ac.jp/record/30090/files/11_Inoue.pdf
application/pdf
27.8 MB
2020-06-01