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Brazilin induces FOXO3A-dependent autophagic cell death by disturbing calcium homeostasis in osteosarcoma cells

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Abstract

Purpose

Osteosarcoma is a common primary malignant bone tumour, and its cure rate has stagnated over the past 25–30 years. Brazilin, a purified natural product from sappan wood (Caesalpinia sappan L.), has been proved to possess potent anti-cancer effects. In this study, we investigated the anti-cancer effect of brazilin on human osteosarcoma and elucidated the underlying mechanisms.

Methods

We exposed MG-63 cells to different concentrations of brazilin (5, 10 and 20 µM) for 24 h. Western blotting, immunocytofluorescence, luciferase reporter assays, and RT-PCR were used to evaluate whether brazilin activates FOXO family-dependent autophagy.

Results

Brazilin increased autophagic flux in the human osteosarcoma cell line MG-63, as evidenced by the upregulation of LC3-II and the downregulation of P62/SQSTM1. Moreover, the pharmacological or genetic blockade of autophagy decreased brazilin-induced cell death, indicating that brazilin triggered autophagic cell death in MG-63 cells. Specifically, brazilin induced FOXO3A(Ser7) phosphorylation, activated FOXO3A nuclear translocation and increased FOXO3A reporter activity, which contributed to the expression of autophagy-related genes and subsequently initiated autophagic cell death in MG-63 cells. Importantly, the increased expression and nuclear translocation of FOXO3A were tightly related to the disturbance of calcium homeostasis, which could be prevented by chelating intracellular calcium.

Conclusions

Taken together, these data demonstrate that brazilin induces osteosarcoma cell death by inducing excessive autophagy, which is mediated through the Ca2+-FOXO3A pathway. Our study provides a new anti-tumour mechanism for brazilin treatment in osteosarcoma patients.

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Funding

This study was funded by a grant from the Guangdong Science and Technology Project (No. 2017A020215162).

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Author notes

  1. Yan Kang and Peiheng He contributed equally to this work.

Authors and Affiliations

  1. Department of Orthopaedic Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, China

    Yan Kang, Peiheng He, Hua Wang & Xing Li

  2. Department of Orthopaedics, The Affiliated Zhuzhou Hospital Xiangya Medical College of Central South University, Zhuzhou, 412007, Hunan, China

    Bowen Wu

  3. Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510000, Guangdong, China

    Peigen Xie

  4. Department of Hepato-Biliary Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, Guangdong, China

    Yibiao Ye

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  1. Yan Kang
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  3. Hua Wang
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Correspondence to Peigen Xie or Bowen Wu.

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Kang, Y., He, P., Wang, H. et al. Brazilin induces FOXO3A-dependent autophagic cell death by disturbing calcium homeostasis in osteosarcoma cells. Cancer Chemother Pharmacol 82, 479–491 (2018). https://doi.org/10.1007/s00280-018-3633-5

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  • DOI: https://doi.org/10.1007/s00280-018-3633-5

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