Inhibition of the proliferation of acquired aromatase inhibitor-resistant breast cancer cells by histone deacetylase inhibitor LBH589 (panobinostat)

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• 作者：Makoto Kubo (1)
  Noriko Kanaya (1)
  Karineh Petrossian (1)
  Jingjing Ye (1)
  Charles Warden (2)
  Zheng Liu (2)
  Reiki Nishimura (3)
  Tomofumi Osako (3)
  Masayuki Okido (4)
  Kazuo Shimada (5)
  Masato Takahashi (6)
  Peiguo Chu (7)
  Yate-Ching Yuan (2)
  Shiuan Chen (1)
  
• 关键词：Acquired aromatase inhibitor resistance ; LBH589 ; NF ; κB1
• 刊名：Breast Cancer Research and Treatment
• 出版年：2013
• 出版时间：January 2013
• 年：2013
• 卷：137
• 期：1
• 页码：93-107
• 全文大小：900KB
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• 作者单位：Makoto Kubo (1)
  Noriko Kanaya (1)
  Karineh Petrossian (1)
  Jingjing Ye (1)
  Charles Warden (2)
  Zheng Liu (2)
  Reiki Nishimura (3)
  Tomofumi Osako (3)
  Masayuki Okido (4)
  Kazuo Shimada (5)
  Masato Takahashi (6)
  Peiguo Chu (7)
  Yate-Ching Yuan (2)
  Shiuan Chen (1)
  
  1. Department of Cancer Biology, Beckman Research Institute of the City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA
  2. Department of Molecular Medicine, Beckman Research Institute of the City of Hope, Duarte, CA, USA
  3. Department of Breast & Endocrine Surgery, Kumamoto City Hospital, Kumamoto, Japan
  4. Department of Breast Surgery, Hamanomachi Hospital, Fukuoka, Japan
  5. Shimada Breast & Surgery Clinic, Kitakyushu, Japan
  6. Department of Breast Surgery, Hokkaido Cancer Center, National Hospital Organization, Sapporo, Japan
  7. Department of Pathology, Beckman Research Institute of the City of Hope, Duarte, CA, United States of America
  
• ISSN：1573-7217

文摘

Aromatase inhibitors (AIs) are important drugs for treating postmenopausal patients with hormone receptor-positive breast cancer. However, acquired resistance to AI therapies is a significant problem. Our study has revealed that the histone deacetylase inhibitor LBH589 treatment abrogated growth of AI-resistant cells in vitro and in vivo, causing cell cycle G2/M arrest and induced apoptosis. LBH589 treatment also reduced the level of NF-κB1 which is overexpressed when AI resistance develops. Analyzing paired tumor specimens from 12 patients, we found that NF-κB1 expression was increased in recurrent AI-resistant tumors as compared to the paired primary tumors before AI treatment. This finding was consistent with up-regulated NF-κB1 expression seen in a collection of well-established AI-resistant cell lines. Furthermore, knockdown of NF-κB1 expression significantly suppressed the proliferation of AI-resistant cells. Treatment of AI-resistant cell lines with LBH589 suppressed NF-κB1 mRNA and protein expression. In addition, LBH589 treatment abrogated growth of AI-resistant tumors in mice, and was associated with significantly decreased levels of NF-κB1 in tumors. In all, our findings strongly support further investigation of LBH589 as a novel therapeutic strategy for patients with AI-resistant breast cancer, in part by suppressing the NF-κB1 pathway.