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Published in: Breast Cancer Research and Treatment 1/2021

01-02-2021 | Breast Cancer | Preclinical study

HDAC6 inhibition enhances the anti-tumor effect of eribulin through tubulin acetylation in triple-negative breast cancer cells

Authors: Takaaki Oba, Mayu Ono, Hisanori Matoba, Takeshi Uehara, Yoshie Hasegawa, Ken-ichi Ito

Published in: Breast Cancer Research and Treatment | Issue 1/2021

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Abstract

Purpose

Improved prognosis for triple-negative breast cancer (TNBC) has plateaued and the development of novel therapeutic strategies is required. This study aimed to explore the anti-tumor effect of combined eribulin and HDAC inhibitor (vorinostat: VOR, pan-HDAC inhibitor and ricolinostat: RICO, selective HDAC6 inhibitor) treatment for TNBC.

Methods

The effect of eribulin in combination with an HDAC inhibitor was tested in three TNBC cell lines (MDA-MB-231, Hs578T, and MDA-MB-157) and their eribulin-resistant derivatives. The expression of acetylated α-tubulin was analyzed by Western blotting for TNBC cells and immunohistochemical analyses for clinical specimens obtained from breast cancer patients who were treated with eribulin.

Results

The simultaneous administration of low concentrations (0.2 μM) of VOR or RICO enhanced the anti-tumor effect of eribulin in MDA-MB-231 and Hs578T cells but not in MDA-MB-157 cells. Meanwhile, pretreatment with 5 μM of VOR or RICO enhanced eribulin sensitivity in all three cell lines. Low concentration of VOR or RICO increased acetylated α-tubulin expression in MDA-MB-231 and Hs578T cells. In contrast, whereas 5 μM of VOR or RICO increased the expression of acetylated α-tubulin in MDA-MB-157 cells, low concentrations did not. Eribulin increased the expression of acetylated α-tubulin in MDA-MB-231 and Hs578T cells but not in MDA-MB-157 cells. These phenomena were also observed in eribulin-resistant cells. Immunohistochemical analyses revealed that the expression of acetylated α-tubulin was increased after eribulin treatment in TNBC.

Conclusions

HDAC6 inhibition enhances the anti-tumor effect of eribulin through the acetylation of α-tubulin. This combination therapy could represent a novel therapeutic strategy for TNBC.
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Metadata
Title
HDAC6 inhibition enhances the anti-tumor effect of eribulin through tubulin acetylation in triple-negative breast cancer cells
Authors
Takaaki Oba
Mayu Ono
Hisanori Matoba
Takeshi Uehara
Yoshie Hasegawa
Ken-ichi Ito
Publication date
01-02-2021
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 1/2021
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-020-06033-2

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