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Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells
Hypoxia-inducible factor-1α (HIF-1α) is a transcription factor that triggers adaptive responses upon low oxygen conditions and plays a crucial role in cancer metabolism and therapy resistance. Tetrathiomolybdate (TM), a therapy option for copper overload disorder, has also been shown to be capable o...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4606568/ https://www.ncbi.nlm.nih.gov/pubmed/26469226 http://dx.doi.org/10.1038/srep14296 |
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author | Kwang Kim, Kyu Abelman, Sarah Yano, Naohiro Ribeiro, Jennifer R. Singh, Rakesh K. Tipping, Marla Moore, Richard G. |
author_facet | Kwang Kim, Kyu Abelman, Sarah Yano, Naohiro Ribeiro, Jennifer R. Singh, Rakesh K. Tipping, Marla Moore, Richard G. |
author_sort | Kwang Kim, Kyu |
collection | PubMed |
description | Hypoxia-inducible factor-1α (HIF-1α) is a transcription factor that triggers adaptive responses upon low oxygen conditions and plays a crucial role in cancer metabolism and therapy resistance. Tetrathiomolybdate (TM), a therapy option for copper overload disorder, has also been shown to be capable of limiting tumor angiogenesis, although its underlying mechanism remains unclear. Using ovarian and endometrial cancer cell lines, we observed that TM downregulates HIF-1α protein levels and HIF-transcriptional targets involved in tumor angiogenesis and glycolysis, but did not affect HIF-1α protein synthesis. TM-mediated HIF-1α downregulation was suppressed when HIF-prolyl hydroxylase activity was pharmacologically inhibited using deferoxamine or dimethyloxaloylglycine, and also when the oxygen-dependent degradation domains of HIF-1α, which are responsible for the interaction with HIF-prolyl hydroxylase, were deleted. These findings suggest that TM causes HIF-1α downregulation in a HIF-prolyl hydroxylase-dependent manner. Our studies showed that TM inhibits the activity of the copper-dependent mitochondrial complex IV and reduces mitochondrial respiration, thereby possibly increasing oxygen availability, which is crucial for HIF-prolyl hydroxylase activity. Pimonidazole staining also showed that TM elevates oxygen tension in hypoxic cells. Our studies provide mechanistic evidence for TM-mediated HIF-1α regulation and suggest its therapeutic potential as a method of blocking angiogenesis in ovarian and endometrial tumors. |
format | Online Article Text |
id | pubmed-4606568 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-46065682015-10-28 Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells Kwang Kim, Kyu Abelman, Sarah Yano, Naohiro Ribeiro, Jennifer R. Singh, Rakesh K. Tipping, Marla Moore, Richard G. Sci Rep Article Hypoxia-inducible factor-1α (HIF-1α) is a transcription factor that triggers adaptive responses upon low oxygen conditions and plays a crucial role in cancer metabolism and therapy resistance. Tetrathiomolybdate (TM), a therapy option for copper overload disorder, has also been shown to be capable of limiting tumor angiogenesis, although its underlying mechanism remains unclear. Using ovarian and endometrial cancer cell lines, we observed that TM downregulates HIF-1α protein levels and HIF-transcriptional targets involved in tumor angiogenesis and glycolysis, but did not affect HIF-1α protein synthesis. TM-mediated HIF-1α downregulation was suppressed when HIF-prolyl hydroxylase activity was pharmacologically inhibited using deferoxamine or dimethyloxaloylglycine, and also when the oxygen-dependent degradation domains of HIF-1α, which are responsible for the interaction with HIF-prolyl hydroxylase, were deleted. These findings suggest that TM causes HIF-1α downregulation in a HIF-prolyl hydroxylase-dependent manner. Our studies showed that TM inhibits the activity of the copper-dependent mitochondrial complex IV and reduces mitochondrial respiration, thereby possibly increasing oxygen availability, which is crucial for HIF-prolyl hydroxylase activity. Pimonidazole staining also showed that TM elevates oxygen tension in hypoxic cells. Our studies provide mechanistic evidence for TM-mediated HIF-1α regulation and suggest its therapeutic potential as a method of blocking angiogenesis in ovarian and endometrial tumors. Nature Publishing Group 2015-10-15 /pmc/articles/PMC4606568/ /pubmed/26469226 http://dx.doi.org/10.1038/srep14296 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Kwang Kim, Kyu Abelman, Sarah Yano, Naohiro Ribeiro, Jennifer R. Singh, Rakesh K. Tipping, Marla Moore, Richard G. Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
title | Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
title_full | Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
title_fullStr | Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
title_full_unstemmed | Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
title_short | Tetrathiomolybdate inhibits mitochondrial complex IV and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
title_sort | tetrathiomolybdate inhibits mitochondrial complex iv and mediates degradation of hypoxia-inducible factor-1α in cancer cells |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4606568/ https://www.ncbi.nlm.nih.gov/pubmed/26469226 http://dx.doi.org/10.1038/srep14296 |
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