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Sheeley MP, Kiesel VA, Andolino C, Lanman NA, Donkin SS, Hursting SD, Wendt MK, Teegarden D. 1α,25-dihydroxyvitamin D reduction of MCF10A-ras cell viability in extracellular matrix detached conditions is dependent on regulation of pyruvate carboxylase. J Nutr Biochem 2022; 109:109116. [DOI: 10.1016/j.jnutbio.2022.109116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 05/02/2022] [Accepted: 06/24/2022] [Indexed: 10/31/2022]
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Kiesel VA, Sheeley MP, Hicks EM, Andolino C, Donkin SS, Wendt MK, Hursting SD, Teegarden D. Hypoxia-Mediated ATF4 Induction Promotes Survival in Detached Conditions in Metastatic Murine Mammary Cancer Cells. Front Oncol 2022; 12:767479. [PMID: 35847893 PMCID: PMC9280133 DOI: 10.3389/fonc.2022.767479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 05/27/2022] [Indexed: 11/23/2022] Open
Abstract
Regions of hypoxia are common in solid tumors and drive changes in gene expression that increase risk of cancer metastasis. Tumor cells must respond to the stress of hypoxia by activating genes to modify cell metabolism and antioxidant response to improve survival. The goal of the current study was to determine the effect of hypoxia on cell metabolism and markers of oxidative stress in metastatic (metM-Wntlung) compared with nonmetastatic (M-Wnt) murine mammary cancer cell lines. We show that hypoxia induced a greater suppression of glutamine to glutamate conversion in metastatic cells (13% in metastatic cells compared to 7% in nonmetastatic cells). We also show that hypoxia increased expression of genes involved in antioxidant response in metastatic compared to nonmetastatic cells, including glutamate cysteine ligase catalytic and modifier subunits and malic enzyme 1. Interestingly, hypoxia increased the mRNA level of the transaminase glutamic pyruvic transaminase 2 (Gpt2, 7.7-fold) only in metM-Wntlung cells. The change in Gpt2 expression was accompanied by transcriptional (4.2-fold) and translational (6.5-fold) induction of the integrated stress response effector protein activating transcription factor 4 (ATF4). Genetic depletion ATF4 demonstrated importance of this molecule for survival of hypoxic metastatic cells in detached conditions. These findings indicate that more aggressive, metastatic cancer cells utilize hypoxia for metabolic reprogramming and induction of antioxidant defense, including activation of ATF4, for survival in detached conditions.
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Affiliation(s)
- Violet A. Kiesel
- Purdue University, Department of Nutrition Science, West Lafayette, IN, United States
| | - Madeline P. Sheeley
- Purdue University, Department of Nutrition Science, West Lafayette, IN, United States
| | - Emily M. Hicks
- Purdue University, Department of Nutrition Science, West Lafayette, IN, United States
| | - Chaylen Andolino
- Purdue University, Department of Nutrition Science, West Lafayette, IN, United States
| | - Shawn S. Donkin
- Purdue University, Department of Animal Science, West Lafayette, IN, United States
| | - Michael K. Wendt
- Purdue University, Department of Medicinal Chemistry and Molecular Pharmacology, West Lafayette, IN, United States
- Purdue University, Purdue University Center for Cancer Research, West Lafayette, IN, United States
| | - Stephen D. Hursting
- University of North Carolina at Chapel Hill, Department of Nutrition, Chapel Hill, NC, United States
- University of North Carolina at Chapel Hill, Lineberger Comprehensive Cancer Center, Chapel Hill, NC, United States
- University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, NC, United States
| | - Dorothy Teegarden
- Purdue University, Department of Nutrition Science, West Lafayette, IN, United States
- Purdue University, Purdue University Center for Cancer Research, West Lafayette, IN, United States
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Kiesel VA, Sheeley MP, Donkin SS, Wendt MK, Hursting SD, Teegarden D. Increased Ammonium Toxicity in Response to Exogenous Glutamine in Metastatic Breast Cancer Cells. Metabolites 2022; 12:469. [PMID: 35629973 PMCID: PMC9145280 DOI: 10.3390/metabo12050469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 05/20/2022] [Accepted: 05/20/2022] [Indexed: 02/03/2023] Open
Abstract
Several cancers, including breast cancers, show dependence on glutamine metabolism. The purpose of the present study was to determine the mechanistic basis and impact of differential glutamine metabolism in nonmetastatic and metastatic murine mammary cancer cells. Universally labeled 13C5-glutamine metabolic tracing, qRT-PCR, measures of reductive-oxidative balance, and exogenous ammonium chloride treatment were used to assess glutamine reprogramming. Results show that 4 mM media concentration of glutamine, compared with 2 mM, reduced viability only in metastatic cells, and that this decrease in viability was accompanied by increased incorporation of glutamine-derived carbon into the tricarboxylic acid (TCA) cycle. While increased glutamine metabolism in metastatic cells occurred in tandem with a decrease in the reduced/oxidized glutathione ratio, treatment with the antioxidant molecule N-acetylcysteine did not rescue cell viability. However, the viability of metastatic cells was more sensitive to ammonium chloride treatment compared with nonmetastatic cells, suggesting a role of metabolic reprogramming in averting nitrogen cytotoxicity in nonmetastatic cells. Overall, these results demonstrate the ability of nonmetastatic cancer cells to reprogram glutamine metabolism and that this ability may be lost in metastatic cells.
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Affiliation(s)
- Violet A. Kiesel
- Department of Nutrition Science, Purdue University, West Lafayette, IN 47907, USA; (V.A.K.); (M.P.S.)
| | - Madeline P. Sheeley
- Department of Nutrition Science, Purdue University, West Lafayette, IN 47907, USA; (V.A.K.); (M.P.S.)
| | - Shawn S. Donkin
- Department of Animal Science, Purdue University, West Lafayette, IN 47907, USA;
| | - Michael K. Wendt
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA;
- The Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA
| | - Stephen D. Hursting
- Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA;
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Nutrition Research Institute, University of North Carolina at Chapel Hill, Kannapolis, NC 28081, USA
| | - Dorothy Teegarden
- Department of Nutrition Science, Purdue University, West Lafayette, IN 47907, USA; (V.A.K.); (M.P.S.)
- The Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA
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Sheeley MP, Teegarden D. Abstract 2327: Pyruvate carboxylase rescues MCF10A- ras cell viability in extracellular matrix detached conditions. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-2327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Breast cancer is the most diagnosed cancer in women, and metastasis accounts for 90% of cancer related deaths. In order to metastasize, cancer cells must survive in conditions where they are detached from the extracellular matrix (ECM). Untransformed cells decrease energy metabolism when detached from ECM, but oncogenic transformation results in rescued energy metabolism of detached cells. Expression of the anaplerotic enzyme pyruvate carboxylase (PC) is required for breast to lung metastasis, and may play a role in promoting ECM detached cell survival by supporting metabolic plasticity. PC activity results in the carboxylation of pyruvate to synthesize the TCA cycle intermediate oxaloacetate (OAA). We hypothesize that PC expression is required for cell survival in ECM detached conditions. The Harvey-ras transformed MCF10A human breast epithelial cell line (MCF10A-ras) were utilized for these studies. ECM detachment was modeled using Poly-HEMA coated plates in combination with MTT assays to measure cell viability. qPCR was used to quantify mRNA abundance of metabolic genes. Protein expression was quantified using western blot. PC activity was determined using [13C6]-glucose flux analysis by comparing 3 carbon labeled (M+3) citrate, malate, and aspartate. Results show a 94% increase in PC mRNA expression and a 90% increase in PC protein expression, in detached cells compared to attached cells. In addition PC knockdown decreases viability in ECM detached conditions significantly by 15%, while PC overexpression increases viability by 17%. Further, replenishing the TCA cycle with OAA, the product of the PC reaction, rescues PC knockdown cells by 14%. Increased PC activity in detached cells was determined by a 23% increase in M+3 malate and a 61% increase in M+3 aspartate. However, an 11% decrease in M+3 citrate was observed, suggesting that detached cells do not utilize increased PC expression to replenish the TCA cycle intermediate, citrate. Given the larger relative increase in PC activity demonstrated by M+3 aspartate, we hypothesized that PC activity is required for detached cell survival to provide substrate for aspartate synthesis. Providing aspartate (2.5 mM), a downstream product of PC, in detached cells with PC knockdown rescued cell viability with no benefit of aspartate supplementation in detached PC expressing cells. Further, the aspartate synthesizing enzyme, glutamate OAA transferase 2 (GOT2) mRNA expression was unchanged in detached cells. In summary PC expression and activity is increased in detached cells compared to attached cells, and OAA produced by the PC reaction is utilized by cells to synthesize aspartate and maintain cell viability in detached conditions. PC may be a useful target for future treatments aimed at preventing metastasis.
Citation Format: Madeline P. Sheeley, Dorothy Teegarden. Pyruvate carboxylase rescues MCF10A-ras cell viability in extracellular matrix detached conditions [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 2327.
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Kiesel VA, Sheeley MP, Coleman MF, Cotul EK, Donkin SS, Hursting SD, Wendt MK, Teegarden D. Pyruvate carboxylase and cancer progression. Cancer Metab 2021; 9:20. [PMID: 33931119 PMCID: PMC8088034 DOI: 10.1186/s40170-021-00256-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 04/04/2021] [Indexed: 01/17/2023] Open
Abstract
Pyruvate carboxylase (PC) is a mitochondrial enzyme that catalyzes the ATP-dependent carboxylation of pyruvate to oxaloacetate (OAA), serving to replenish the tricarboxylic acid (TCA) cycle. In nonmalignant tissue, PC plays an essential role in controlling whole-body energetics through regulation of gluconeogenesis in the liver, synthesis of fatty acids in adipocytes, and insulin secretion in pancreatic β cells. In breast cancer, PC activity is linked to pulmonary metastasis, potentially by providing the ability to utilize glucose, fatty acids, and glutamine metabolism as needed under varying conditions as cells metastasize. PC enzymatic activity appears to be of particular importance in cancer cells that are unable to utilize glutamine for anaplerosis. Moreover, PC activity also plays a role in lipid metabolism and protection from oxidative stress in cancer cells. Thus, PC activity may be essential to link energy substrate utilization with cancer progression and to enable the metabolic flexibility necessary for cell resilience to changing and adverse conditions during the metastatic process.
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Affiliation(s)
- Violet A Kiesel
- Department of Nutrition Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Madeline P Sheeley
- Department of Nutrition Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Michael F Coleman
- Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, USA
| | - Eylem Kulkoyluoglu Cotul
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, USA
| | - Shawn S Donkin
- Department of Animal Science, Purdue University, West Lafayette, USA
| | - Stephen D Hursting
- Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, USA
| | - Michael K Wendt
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, USA
| | - Dorothy Teegarden
- Department of Nutrition Sciences, Purdue University, West Lafayette, IN, 47907, USA.
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Sheeley MP, Andolino C, Kiesel VA, Teegarden D. Vitamin D regulation of energy metabolism in cancer. Br J Pharmacol 2021; 179:2890-2905. [PMID: 33651382 DOI: 10.1111/bph.15424] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/29/2021] [Accepted: 02/21/2021] [Indexed: 12/12/2022] Open
Abstract
Vitamin D exerts anti-cancer effects in recent clinical trials and preclinical models. The actions of vitamin D are primarily mediated through its hormonal form, 1,25-dihydroxyvitamin D (1,25(OH)2 D). Previous literature describing in vitro studies has predominantly focused on the anti-tumourigenic effects of the hormone, such as proliferation and apoptosis. However, recent evidence has identified 1,25(OH)2 D as a regulator of energy metabolism in cancer cells, where requirements for specific energy sources at different stages of progression are dramatically altered. The literature suggests that 1,25(OH)2 D regulates energy metabolism, including glucose, glutamine and lipid metabolism during cancer progression, as well as oxidative stress protection, as it is closely associated with energy metabolism. Mechanisms involved in energy metabolism regulation are an emerging area in which vitamin D may inhibit multiple stages of cancer progression.
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Affiliation(s)
- Madeline P Sheeley
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA
| | - Chaylen Andolino
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA
| | - Violet A Kiesel
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA
| | - Dorothy Teegarden
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA
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