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SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation

Skp2 is a component of the E3 ubiquitin ligase which promotes the ubiquitination-associated degradation of a cyclin-dependent kinase inhibitor, p27, resulting in increases in non-small cell lung cancer (NSCLC) cell growth. We recently showed that down-regulation of Sirtuin deacetylases 2 (SIRT2) in...

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Autores principales: Li, Ziming, Huang, Jia, Yuan, Hong, Chen, Zhiwei, Luo, Qingquan, Lu, Shun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Impact Journals LLC 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4951341/
https://www.ncbi.nlm.nih.gov/pubmed/26942878
http://dx.doi.org/10.18632/oncotarget.7816
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author Li, Ziming
Huang, Jia
Yuan, Hong
Chen, Zhiwei
Luo, Qingquan
Lu, Shun
author_facet Li, Ziming
Huang, Jia
Yuan, Hong
Chen, Zhiwei
Luo, Qingquan
Lu, Shun
author_sort Li, Ziming
collection PubMed
description Skp2 is a component of the E3 ubiquitin ligase which promotes the ubiquitination-associated degradation of a cyclin-dependent kinase inhibitor, p27, resulting in increases in non-small cell lung cancer (NSCLC) cell growth. We recently showed that down-regulation of Sirtuin deacetylases 2 (SIRT2) in NSCLC increased cancer cell growth through suppressing p27. However, the underlying mechanisms remain unknown. Here, we examined the relationship between SIRT2 and Skp2 in regulation of NSCLC cell growth through p27. We found that the levels of SIRT2 significantly decreased, while the levels of Skp2 significantly increased in NSCLC specimens, compared to the paired non-tumor lung tissue. The levels of SIRT2 and Skp2 inversely correlated. Low SIRT2 levels were associated with poor patients' survival. Moreover, in several lung cancer cell lines, the SIRT2 levels significantly decreased and the Skp2 levels significantly increased. Overexpression of SIRT2 promoted Skp2 deacetylation and degradation, resulting in increases in p27 and suppression of NSCLC cell growth, whereas knockdown of Skp2 inhibited Skp2 deacetylation and degradation, resulting in decreases in p27 and increases in NSCLC cell growth. The deacetylation of Skp2 by SIRT2 and degradation of p27 by Skp2 were significantly inhibited by histone deacetylase inhibitor and proteasome inhibitor, respectively. Finally, SIRT2 and Skp2 co-immunoprecipitated in NSCLC cells. Together, our data suggest that SIRT2 may induce Skp2 deacetylation and subsequent degradation to abolish the effects of Skp2 on p27 to affect NSCLC cell growth. Thus, re-expression of SIRT2 may be a promising strategy for treating NSCLC.
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spelling pubmed-49513412016-07-21 SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation Li, Ziming Huang, Jia Yuan, Hong Chen, Zhiwei Luo, Qingquan Lu, Shun Oncotarget Research Paper Skp2 is a component of the E3 ubiquitin ligase which promotes the ubiquitination-associated degradation of a cyclin-dependent kinase inhibitor, p27, resulting in increases in non-small cell lung cancer (NSCLC) cell growth. We recently showed that down-regulation of Sirtuin deacetylases 2 (SIRT2) in NSCLC increased cancer cell growth through suppressing p27. However, the underlying mechanisms remain unknown. Here, we examined the relationship between SIRT2 and Skp2 in regulation of NSCLC cell growth through p27. We found that the levels of SIRT2 significantly decreased, while the levels of Skp2 significantly increased in NSCLC specimens, compared to the paired non-tumor lung tissue. The levels of SIRT2 and Skp2 inversely correlated. Low SIRT2 levels were associated with poor patients' survival. Moreover, in several lung cancer cell lines, the SIRT2 levels significantly decreased and the Skp2 levels significantly increased. Overexpression of SIRT2 promoted Skp2 deacetylation and degradation, resulting in increases in p27 and suppression of NSCLC cell growth, whereas knockdown of Skp2 inhibited Skp2 deacetylation and degradation, resulting in decreases in p27 and increases in NSCLC cell growth. The deacetylation of Skp2 by SIRT2 and degradation of p27 by Skp2 were significantly inhibited by histone deacetylase inhibitor and proteasome inhibitor, respectively. Finally, SIRT2 and Skp2 co-immunoprecipitated in NSCLC cells. Together, our data suggest that SIRT2 may induce Skp2 deacetylation and subsequent degradation to abolish the effects of Skp2 on p27 to affect NSCLC cell growth. Thus, re-expression of SIRT2 may be a promising strategy for treating NSCLC. Impact Journals LLC 2016-03-01 /pmc/articles/PMC4951341/ /pubmed/26942878 http://dx.doi.org/10.18632/oncotarget.7816 Text en Copyright: © 2016 Li et al. http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Paper
Li, Ziming
Huang, Jia
Yuan, Hong
Chen, Zhiwei
Luo, Qingquan
Lu, Shun
SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation
title SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation
title_full SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation
title_fullStr SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation
title_full_unstemmed SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation
title_short SIRT2 inhibits non-small cell lung cancer cell growth through impairing Skp2-mediated p27 degradation
title_sort sirt2 inhibits non-small cell lung cancer cell growth through impairing skp2-mediated p27 degradation
topic Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4951341/
https://www.ncbi.nlm.nih.gov/pubmed/26942878
http://dx.doi.org/10.18632/oncotarget.7816
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