Open Access

Novel bone microenvironment model of castration‑resistant prostate cancer with chitosan fiber matrix and osteoblasts

  • Authors:
    • Masahiro Samoto
    • Hideyasu Matsuyama
    • Hiroaki Matsumoto
    • Hiroshi Hirata
    • Koji Ueno
    • Sho Ozawa
    • Junichi Mori
    • Ryo Inoue
    • Seiji Yano
    • Yoshiaki Yamamoto
    • Jun Haginaka
    • Shizuyo Horiyama
    • Koji Tamada
  • View Affiliations

  • Published online on: August 1, 2021     https://doi.org/10.3892/ol.2021.12950
  • Article Number: 689
  • Copyright: © Samoto et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The interaction between prostate cancer cells and osteoblasts is essential for the development of bone metastasis. Previously, novel androgen receptor axis‑targeted agents (ARATs) were approved for metastatic castration‑naïve and non‑metastatic castration‑resistant prostate cancer (CRPC); both of which are pivotal for investigating the association between the bone microenvironment and tumors. The present study established a novel in vitro 3D microenvironment model that simulated the bone microenvironment of CRPC, and evaluated the drug susceptibility of ARATs and the efficacy of the combination of abiraterone and dutasteride. Green fluorescent protein‑transferred C4‑2 cells (a CRPC cell line) and red fluorescent protein‑transferred human osteoblasts differentiated from human mesenchymal stem cells were co‑cultured in chitosan nanofiber matrix‑coated culture plates to simulate the 3D scaffold of the bone microenvironment. The growth of C4‑2 was quantified using live‑cell imaging and the Cell3 iMager duos analysis system. The growth of C4‑2 colonies were quantified for a maximum of 30 days. The expression of TGF‑β increased and promoted EMT in C4‑2 cells co‑cultured with osteoblasts, indicating resistance to ARATs. The IC50 of each drug and the combination effect of abiraterone and dutasteride were evaluated using this model. Combination treatment with abiraterone and dutasteride synergistically inhibited the growth of C2‑4 colonies compared with individual investigational agents. This could be attributed to the reduction of 3‑keto‑5α‑abiraterone, an androgen receptor agonist. The bone microenvironment model of the present study is unique and useful for evaluating new drug susceptibility testing in prostate cancer cells. This model may help to reveal the unknown mechanisms underlying micro‑ to clinical bone metastasis in prostate cancer.
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October-2021
Volume 22 Issue 4

Print ISSN: 1792-1074
Online ISSN:1792-1082

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Spandidos Publications style
Samoto M, Matsuyama H, Matsumoto H, Hirata H, Ueno K, Ozawa S, Mori J, Inoue R, Yano S, Yamamoto Y, Yamamoto Y, et al: Novel bone microenvironment model of castration‑resistant prostate cancer with chitosan fiber matrix and osteoblasts. Oncol Lett 22: 689, 2021.
APA
Samoto, M., Matsuyama, H., Matsumoto, H., Hirata, H., Ueno, K., Ozawa, S. ... Tamada, K. (2021). Novel bone microenvironment model of castration‑resistant prostate cancer with chitosan fiber matrix and osteoblasts. Oncology Letters, 22, 689. https://doi.org/10.3892/ol.2021.12950
MLA
Samoto, M., Matsuyama, H., Matsumoto, H., Hirata, H., Ueno, K., Ozawa, S., Mori, J., Inoue, R., Yano, S., Yamamoto, Y., Haginaka, J., Horiyama, S., Tamada, K."Novel bone microenvironment model of castration‑resistant prostate cancer with chitosan fiber matrix and osteoblasts". Oncology Letters 22.4 (2021): 689.
Chicago
Samoto, M., Matsuyama, H., Matsumoto, H., Hirata, H., Ueno, K., Ozawa, S., Mori, J., Inoue, R., Yano, S., Yamamoto, Y., Haginaka, J., Horiyama, S., Tamada, K."Novel bone microenvironment model of castration‑resistant prostate cancer with chitosan fiber matrix and osteoblasts". Oncology Letters 22, no. 4 (2021): 689. https://doi.org/10.3892/ol.2021.12950