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The oncoprotein H-Ras(V12 )increases mitochondrial metabolism

BACKGROUND: Neoplastic cells increase glycolysis in order to produce anabolic precursors and energy within the hypoxic environment of a tumor. Ras signaling is activated in several cancers and has been found to regulate metabolism by enhancing glycolytic flux to lactate. We examined the effects of s...

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Autores principales: Telang, Sucheta, Lane, Andrew N, Nelson, Kristin K, Arumugam, Sengodagounder, Chesney, Jason
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2007
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222650/
https://www.ncbi.nlm.nih.gov/pubmed/18053146
http://dx.doi.org/10.1186/1476-4598-6-77
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author Telang, Sucheta
Lane, Andrew N
Nelson, Kristin K
Arumugam, Sengodagounder
Chesney, Jason
author_facet Telang, Sucheta
Lane, Andrew N
Nelson, Kristin K
Arumugam, Sengodagounder
Chesney, Jason
author_sort Telang, Sucheta
collection PubMed
description BACKGROUND: Neoplastic cells increase glycolysis in order to produce anabolic precursors and energy within the hypoxic environment of a tumor. Ras signaling is activated in several cancers and has been found to regulate metabolism by enhancing glycolytic flux to lactate. We examined the effects of sequential immortalization and H-Ras(V12)-transformation of human bronchial epithelial cells on the anabolic fate of fully-labeled (13)C-glucose-derived carbons using two-dimensional total correlated spectroscopic analysis-nuclear magnetic resonance spectroscopy (2D TOCSY-NMR). RESULTS: We found that the introduction of activated H-Ras(V12 )into immortalized human bronchial epithelial cells unexpectedly increased tricarboxylic acid cycle activity as measured by the direct conversion of (13)C-glucose carbons into the anabolic substrates glutamate/glutamine, aspartate and uridine. We then observed that immortalization and H-Ras(V12)-transformation of bronchial epithelial cells caused a stepwise increase in oxygen consumption, a global measure of electron transport chain activity. Importantly, ectopic expression of H-Ras(V12 )sensitized immortalized cells to the ATP-depleting and cytotoxic effects of electron transport perturbation using the complex I inhibitor rotenone. CONCLUSION: Taken together, these data indicate that the oncoprotein H-Ras(V12 )increases mitochondrial metabolism and provide new rationale for the targeting of the tricarboxylic acid cycle and electron transport chain as anti-neoplastic strategies.
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spelling pubmed-22226502008-02-01 The oncoprotein H-Ras(V12 )increases mitochondrial metabolism Telang, Sucheta Lane, Andrew N Nelson, Kristin K Arumugam, Sengodagounder Chesney, Jason Mol Cancer Research BACKGROUND: Neoplastic cells increase glycolysis in order to produce anabolic precursors and energy within the hypoxic environment of a tumor. Ras signaling is activated in several cancers and has been found to regulate metabolism by enhancing glycolytic flux to lactate. We examined the effects of sequential immortalization and H-Ras(V12)-transformation of human bronchial epithelial cells on the anabolic fate of fully-labeled (13)C-glucose-derived carbons using two-dimensional total correlated spectroscopic analysis-nuclear magnetic resonance spectroscopy (2D TOCSY-NMR). RESULTS: We found that the introduction of activated H-Ras(V12 )into immortalized human bronchial epithelial cells unexpectedly increased tricarboxylic acid cycle activity as measured by the direct conversion of (13)C-glucose carbons into the anabolic substrates glutamate/glutamine, aspartate and uridine. We then observed that immortalization and H-Ras(V12)-transformation of bronchial epithelial cells caused a stepwise increase in oxygen consumption, a global measure of electron transport chain activity. Importantly, ectopic expression of H-Ras(V12 )sensitized immortalized cells to the ATP-depleting and cytotoxic effects of electron transport perturbation using the complex I inhibitor rotenone. CONCLUSION: Taken together, these data indicate that the oncoprotein H-Ras(V12 )increases mitochondrial metabolism and provide new rationale for the targeting of the tricarboxylic acid cycle and electron transport chain as anti-neoplastic strategies. BioMed Central 2007-12-01 /pmc/articles/PMC2222650/ /pubmed/18053146 http://dx.doi.org/10.1186/1476-4598-6-77 Text en Copyright © 2007 Telang et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Telang, Sucheta
Lane, Andrew N
Nelson, Kristin K
Arumugam, Sengodagounder
Chesney, Jason
The oncoprotein H-Ras(V12 )increases mitochondrial metabolism
title The oncoprotein H-Ras(V12 )increases mitochondrial metabolism
title_full The oncoprotein H-Ras(V12 )increases mitochondrial metabolism
title_fullStr The oncoprotein H-Ras(V12 )increases mitochondrial metabolism
title_full_unstemmed The oncoprotein H-Ras(V12 )increases mitochondrial metabolism
title_short The oncoprotein H-Ras(V12 )increases mitochondrial metabolism
title_sort oncoprotein h-ras(v12 )increases mitochondrial metabolism
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2222650/
https://www.ncbi.nlm.nih.gov/pubmed/18053146
http://dx.doi.org/10.1186/1476-4598-6-77
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