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Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation

Overexpression of the GLI1 gene has frequently been found in various cancer types, particularly in brain tumors, in which aberrant GLI1 induction promotes cancer cell growth. Therefore, identifying the molecular players controlling GLI1 expression is of clinical importance. Previously, we reported t...

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Autores principales: Zhang, Rui, Huang, Sherri Y., Ka-Wai Li, Kay, Li, Yen-Hsing, Hsu, Wei-Hsuan, Zhang, Guang Jun, Chang, Chun-Ju, Yang, Jer-Yen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Impact Journals LLC 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5564814/
https://www.ncbi.nlm.nih.gov/pubmed/28562331
http://dx.doi.org/10.18632/oncotarget.17769
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author Zhang, Rui
Huang, Sherri Y.
Ka-Wai Li, Kay
Li, Yen-Hsing
Hsu, Wei-Hsuan
Zhang, Guang Jun
Chang, Chun-Ju
Yang, Jer-Yen
author_facet Zhang, Rui
Huang, Sherri Y.
Ka-Wai Li, Kay
Li, Yen-Hsing
Hsu, Wei-Hsuan
Zhang, Guang Jun
Chang, Chun-Ju
Yang, Jer-Yen
author_sort Zhang, Rui
collection PubMed
description Overexpression of the GLI1 gene has frequently been found in various cancer types, particularly in brain tumors, in which aberrant GLI1 induction promotes cancer cell growth. Therefore, identifying the molecular players controlling GLI1 expression is of clinical importance. Previously, we reported that AMPK directly phosphorylated and destabilized GLI1, resulting in the suppression of the Hedgehog signaling pathway. The current study not only demonstrates that AMPK inhibits GLI1 nuclear localization, but further reveals that β-TrCP plays an essential role in AMPK-induced GLI1 degradation. We found that activation of AMPK promotes the interaction between β-TrCP and GLI1, and induces β-TrCP-mediated GLI1-ubiquitination and degradation. Inhibiting AMPK activity results in the dissociation of the β-TrCP and GLI1 interaction, and diminishes β-TrCP-mediated-GLI1 ubiquitination and degradation. On GLI1, substitution of AMPK phosphorylation sites to aspartic acid (GLI1(3E)) results in stronger binding affinity of GLI1 with β-TrCP, accompanied by enhanced GLI1 ubiquitination and later degradation. In contrast, the GLI1 alanine mutant (GLI1(3A)) shows weaker binding with β-TrCP, which is accompanied by reduced β-TrCP-mediated ubiquitination and degradation. Together, these results demonstrate that AMPK regulates GLI1 interaction with β-TrCP by phosphorylating GLI1 and thus both post-translational modifications by AMPK and β-TrCP ultimately impact GLI1 degradation.
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spelling pubmed-55648142017-08-23 Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation Zhang, Rui Huang, Sherri Y. Ka-Wai Li, Kay Li, Yen-Hsing Hsu, Wei-Hsuan Zhang, Guang Jun Chang, Chun-Ju Yang, Jer-Yen Oncotarget Research Paper Overexpression of the GLI1 gene has frequently been found in various cancer types, particularly in brain tumors, in which aberrant GLI1 induction promotes cancer cell growth. Therefore, identifying the molecular players controlling GLI1 expression is of clinical importance. Previously, we reported that AMPK directly phosphorylated and destabilized GLI1, resulting in the suppression of the Hedgehog signaling pathway. The current study not only demonstrates that AMPK inhibits GLI1 nuclear localization, but further reveals that β-TrCP plays an essential role in AMPK-induced GLI1 degradation. We found that activation of AMPK promotes the interaction between β-TrCP and GLI1, and induces β-TrCP-mediated GLI1-ubiquitination and degradation. Inhibiting AMPK activity results in the dissociation of the β-TrCP and GLI1 interaction, and diminishes β-TrCP-mediated-GLI1 ubiquitination and degradation. On GLI1, substitution of AMPK phosphorylation sites to aspartic acid (GLI1(3E)) results in stronger binding affinity of GLI1 with β-TrCP, accompanied by enhanced GLI1 ubiquitination and later degradation. In contrast, the GLI1 alanine mutant (GLI1(3A)) shows weaker binding with β-TrCP, which is accompanied by reduced β-TrCP-mediated ubiquitination and degradation. Together, these results demonstrate that AMPK regulates GLI1 interaction with β-TrCP by phosphorylating GLI1 and thus both post-translational modifications by AMPK and β-TrCP ultimately impact GLI1 degradation. Impact Journals LLC 2017-05-10 /pmc/articles/PMC5564814/ /pubmed/28562331 http://dx.doi.org/10.18632/oncotarget.17769 Text en Copyright: © 2017 Zhang et al. http://creativecommons.org/licenses/by/3.0/ This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) (CC-BY), which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Research Paper
Zhang, Rui
Huang, Sherri Y.
Ka-Wai Li, Kay
Li, Yen-Hsing
Hsu, Wei-Hsuan
Zhang, Guang Jun
Chang, Chun-Ju
Yang, Jer-Yen
Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation
title Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation
title_full Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation
title_fullStr Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation
title_full_unstemmed Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation
title_short Dual degradation signals destruct GLI1: AMPK inhibits GLI1 through β-TrCP-mediated proteasome degradation
title_sort dual degradation signals destruct gli1: ampk inhibits gli1 through β-trcp-mediated proteasome degradation
topic Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5564814/
https://www.ncbi.nlm.nih.gov/pubmed/28562331
http://dx.doi.org/10.18632/oncotarget.17769
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