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Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2
Heat shock protein 90 (Hsp90) is a molecular chaperone that facilitates the correct folding and functionality of its client protein. Numerous Hsp90-client proteins are involved in cancer development. Thus, Hsp90 inhibitors have potential applications as anti-cancer drugs. We previously discovered th...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5618635/ https://www.ncbi.nlm.nih.gov/pubmed/28914785 http://dx.doi.org/10.3390/ijms18091986 |
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author | Lee, Yueh-Chun Chang, Wen-Wei Chen, Yi-Ying Tsai, Yu-Hung Chou, Ying-Hsiang Tseng, Hsien-Chun Chen, Hsin-Lin Wu, Chun-Chieh Chang-Chien, Ju Lee, Hsueh-Te Yang, Huei-Fan Wang, Bing-Yen |
author_facet | Lee, Yueh-Chun Chang, Wen-Wei Chen, Yi-Ying Tsai, Yu-Hung Chou, Ying-Hsiang Tseng, Hsien-Chun Chen, Hsin-Lin Wu, Chun-Chieh Chang-Chien, Ju Lee, Hsueh-Te Yang, Huei-Fan Wang, Bing-Yen |
author_sort | Lee, Yueh-Chun |
collection | PubMed |
description | Heat shock protein 90 (Hsp90) is a molecular chaperone that facilitates the correct folding and functionality of its client protein. Numerous Hsp90-client proteins are involved in cancer development. Thus, Hsp90 inhibitors have potential applications as anti-cancer drugs. We previously discovered that Hsp90α expression increased in breast cancer stem cells (BCSCs), which can initiate tumorigenesis and metastasis and resist treatment. In the present study, we further demonstrated that 17-dimethylaminoethylamino-17-demethoxygeldanamycin (17-DMAG), an inhibitor of Hsp90, could suppress the self-renewal of BCSCs by downregulating B lymphoma Mo-MLV insertion region 1 homolog (BMI1), a polycomb family member with oncogenic activity in breast cancer. Through immunoprecipitation analysis, we found that BMI1 did not interact with Hsp90α and that the downregulation of BMI1 by 17-DMAG was mediated by the inhibition of c-Myc and enhancement of zeste homolog 2 (EZH2) expression. The transcriptional and BMI1 promoter-binding activities of c-Myc in BCSCs were inhibited by 17-DMAG treatment. The overexpression of EZH2 attenuated the inhibitory effect of 17-DMAG on BMI1 and c-Myc expression. Furthermore, Hsp90α could be co-immunoprecipitated with c-Myc and EZH2 and bind to the BMI1 promoter. Treatment with 17-DMAG decreased the nuclear expression of EZH2 and c-Myc but not that of Hsp90α. In conclusion, our data suggested that Hsp90α could positively regulate the self-renewal of BCSCs by facilitating the nuclear translocation of c-Myc and EZH2 to maintain BMI1 expression. |
format | Online Article Text |
id | pubmed-5618635 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-56186352017-09-30 Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 Lee, Yueh-Chun Chang, Wen-Wei Chen, Yi-Ying Tsai, Yu-Hung Chou, Ying-Hsiang Tseng, Hsien-Chun Chen, Hsin-Lin Wu, Chun-Chieh Chang-Chien, Ju Lee, Hsueh-Te Yang, Huei-Fan Wang, Bing-Yen Int J Mol Sci Article Heat shock protein 90 (Hsp90) is a molecular chaperone that facilitates the correct folding and functionality of its client protein. Numerous Hsp90-client proteins are involved in cancer development. Thus, Hsp90 inhibitors have potential applications as anti-cancer drugs. We previously discovered that Hsp90α expression increased in breast cancer stem cells (BCSCs), which can initiate tumorigenesis and metastasis and resist treatment. In the present study, we further demonstrated that 17-dimethylaminoethylamino-17-demethoxygeldanamycin (17-DMAG), an inhibitor of Hsp90, could suppress the self-renewal of BCSCs by downregulating B lymphoma Mo-MLV insertion region 1 homolog (BMI1), a polycomb family member with oncogenic activity in breast cancer. Through immunoprecipitation analysis, we found that BMI1 did not interact with Hsp90α and that the downregulation of BMI1 by 17-DMAG was mediated by the inhibition of c-Myc and enhancement of zeste homolog 2 (EZH2) expression. The transcriptional and BMI1 promoter-binding activities of c-Myc in BCSCs were inhibited by 17-DMAG treatment. The overexpression of EZH2 attenuated the inhibitory effect of 17-DMAG on BMI1 and c-Myc expression. Furthermore, Hsp90α could be co-immunoprecipitated with c-Myc and EZH2 and bind to the BMI1 promoter. Treatment with 17-DMAG decreased the nuclear expression of EZH2 and c-Myc but not that of Hsp90α. In conclusion, our data suggested that Hsp90α could positively regulate the self-renewal of BCSCs by facilitating the nuclear translocation of c-Myc and EZH2 to maintain BMI1 expression. MDPI 2017-09-15 /pmc/articles/PMC5618635/ /pubmed/28914785 http://dx.doi.org/10.3390/ijms18091986 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Lee, Yueh-Chun Chang, Wen-Wei Chen, Yi-Ying Tsai, Yu-Hung Chou, Ying-Hsiang Tseng, Hsien-Chun Chen, Hsin-Lin Wu, Chun-Chieh Chang-Chien, Ju Lee, Hsueh-Te Yang, Huei-Fan Wang, Bing-Yen Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 |
title | Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 |
title_full | Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 |
title_fullStr | Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 |
title_full_unstemmed | Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 |
title_short | Hsp90α Mediates BMI1 Expression in Breast Cancer Stem/Progenitor Cells through Facilitating Nuclear Translocation of c-Myc and EZH2 |
title_sort | hsp90α mediates bmi1 expression in breast cancer stem/progenitor cells through facilitating nuclear translocation of c-myc and ezh2 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5618635/ https://www.ncbi.nlm.nih.gov/pubmed/28914785 http://dx.doi.org/10.3390/ijms18091986 |
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