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Trans-4-lodo,4′-boranyl-chalcone induces antitumor activity against malignant glioma cell lines in vitro and in vivo

  • Lab. Investigation-Human/Animal Tissue
  • Published:
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Abstract

Chalcones are considered the precursors of flavonoids and have been identified as interesting compounds with antitumor properties. Boronic-chalcone derivatives are more toxic to breast cancer cells compared to normal breast cells. Here, we studied the antitumor activities of trans-4-lodo,4′-boranyl-chalcone (TLBC), which is a boronic-chalcone derivative, in several glioma cell lines. TLBC showed a dose-dependent inhibition with inhibitory concentration 50% value in the μM range (5.5–25.5 μM) in various glioma cell lines. Flow cytometric and western blot assay demonstrated that TLBC induced apoptosis independent of changes to the tumor suppressor p53. This cytotoxic effect was the caspase-dependent manner. Also, TLBC lowered levels of anti-apoptotic Bcl-2 and/or Bcl-XL protein in several of the cell lines. To examine the antitumor effect of TLBC in vivo, we used a malignant glioma xenograft model. This result showed that in the mice treated with TLBC at 20 mg/kg, mean tumor volume was reduced by 43.9% (P < 0.01) in comparison with the control group. Immunohistochemical and western blot analysis showed that Bcl-2 protein levels were decreased and Bax protein levels were slightly increased in the tumors injected with 20 mg/kg TLBC compared with the control tumors. Therefore, we conclude that TLBC may be a potential chemotherapeutic agent for human glioma.

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Abbreviations

Glioblastoma multiforme:

GBM

Trans-4-lodo,4′-boranyl-chalcone:

TLBC

Mouse double minute 2:

MDM2

methylthiazol tetrazolium colorimetric assay:

MTT assay

terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling:

TUNEL

poly(ADP-ribose) polymerase:

PARP

Benzyloxycarbonyl-Val-Ala-Asp (OMe) fluoromethylketone:

Z-VAD-fmk

Half-maximal inhibition of cell proliferation:

IC50

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Acknowledgements

This work was supported in part by a Grant-in-Aid for Scientific Research to Eiji Kohmura (15659337), Atsufumi Kawamura (16591440), and Takashi Sasayama (17790968) from the Japanese Ministry of Education, Culture, Sports, Science and Technology. We are grateful to Saya H, M.D., Ph.D. (Kumamoto University, Kumamoto), for valuable suggestions on various analyses. We would also like to thank Katoh A and Takase M for technical assistance with the analysis in vitro and experiments in vivo.

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Authors and Affiliations

  1. Department of Neurosurgery, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan

    Takashi Sasayama, Kazuhiro Tanaka, Katsu Mizukawa, Takeshi Kondoh, Kohkichi Hosoda & Eiji Kohmura

  2. Department of Neurosurgery, Hyogo Prefectural Kobe Children’s Hospital, 1-1-1 Takakuradai, Suma-Ku, Kobe, Hyogo, 654-0081, Japan

    Atsufumi Kawamura

Authors
  1. Takashi Sasayama
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  2. Kazuhiro Tanaka
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  3. Katsu Mizukawa
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  4. Atsufumi Kawamura
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  5. Takeshi Kondoh
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  6. Kohkichi Hosoda
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  7. Eiji Kohmura
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Correspondence to Takashi Sasayama.

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Sasayama, T., Tanaka, K., Mizukawa, K. et al. Trans-4-lodo,4′-boranyl-chalcone induces antitumor activity against malignant glioma cell lines in vitro and in vivo . J Neurooncol 85, 123–132 (2007). https://doi.org/10.1007/s11060-007-9395-2

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  • DOI: https://doi.org/10.1007/s11060-007-9395-2

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