The Combination of Methioninase and Ethionine Exploits Methionine Addiction to Selectively Eradicate Osteosarcoma Cells and Not Normal Cells and Synergistically Down-regulates the Expression of C-MYC .

Autor: Aoki Y; AntiCancer Inc, San Diego, CA, U.S.A.; yaoki0630@gmail.com.; Department of Surgery, University of California, San Diego, CA, U.S.A.; Department of Orthopedic Surgery, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan., Kubota Y; AntiCancer Inc, San Diego, CA, U.S.A.; Department of Surgery, University of California, San Diego, CA, U.S.A., Han Q; AntiCancer Inc, San Diego, CA, U.S.A., Masaki N; AntiCancer Inc, San Diego, CA, U.S.A.; Department of Surgery, University of California, San Diego, CA, U.S.A., Obara K; AntiCancer Inc, San Diego, CA, U.S.A.; Department of Surgery, University of California, San Diego, CA, U.S.A., Bouvet M; Department of Surgery, University of California, San Diego, CA, U.S.A., Chawla SP; Sarcoma Oncology Center, Santa Monica, CA, U.S.A., Tome Y; Department of Orthopedic Surgery, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan; yastome@med.u-ryukyu.ac.jp., Nishida K; Department of Orthopedic Surgery, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan., Hoffman RM; AntiCancer Inc, San Diego, CA, U.S.A.; all@anticancer.com.; Department of Surgery, University of California, San Diego, CA, U.S.A.
Jazyk: angličtina
Zdroj: Cancer genomics & proteomics [Cancer Genomics Proteomics] 2023 Dec; Vol. 20 (6suppl), pp. 679-685.
DOI: 10.21873/cgp.20415
Abstrakt: Background/aim: The fundamental and general hallmark of cancer cells, methionine addiction, termed the Hoffman effect, is due to overuse of methionine for highly-increased transmethylation reactions. In the present study, we tested if the combination efficacy of recombinant methioninase (rMETase) and a methionine analogue, ethionine, could eradicate osteosarcoma cells and down-regulate the expression of c-MYC.
Materials and Methods: 143B osteosarcoma cells and Hs27 normal human fibroblasts were tested. The efficacy of rMETase alone and ethionine, alone and in their combination, on cell viability was determined with the WST-8 assay on 143B cells and Hs27 cells. c-MYC expression was examined with western immunoblotting and compared in 143B cells treated with/without rMETase, ethionine, or the combination of both rMETase and ethionine.
Results: 143B cells were more sensitive to both rMETase and ethionine than Hs 27 cells, with the following IC 50 s: rMETase (143B: 0.22 U/ml; Hs27: 0.82 U/ml); ethionine (143B: 0.24 mg/ml; Hs27: 0.42 mg/ml). The combination of rMETase and ethionine synergistically eradicated 143B cells, lowering the IC50 for ethionine 14-fold compared to ethionine alone (p<0.001). In contrast, Hs27 fibroblasts were relatively resistant to the combination. The expression of c-MYC was significantly down-regulated only by the combination of rMETase and ethionine in 143B cells (p<0.001).
Conclusion: In the present study, we showed, for the first time, the synergistic combination efficacy of rMETase and ethionine on osteosarcoma cells in contrast to normal fibroblasts, which were relatively resistant. The combination of rMETase and ethionine down-regulated c-MYC expression in the cancer cells. The present results indicate the combination of rMETase and ethionine may reduce the malignancy of osteosarcoma cells and can be a potential future clinical strategy.
(Copyright © 2023, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.)
Databáze: MEDLINE
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