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Moon D, Hauck JS, Jiang X, Quang H, Xu L, Zhang F, Gao X, Wild R, Everitt JI, Macias E, He Y, Huang J. Targeting glutamine dependence with DRP-104 inhibits proliferation and tumor growth of castration-resistant prostate cancer. Prostate 2024; 84:349-357. [PMID: 38084059 PMCID: PMC10872917 DOI: 10.1002/pros.24654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/07/2023] [Accepted: 11/29/2023] [Indexed: 01/01/2024]
Abstract
BACKGROUND Prostate cancer (PCa) continues to be one of the leading causes of cancer deaths in men. While androgen deprivation therapy is initially effective, castration-resistant PCa (CRPC) often recurs and has limited treatment options. Our previous study identified glutamine metabolism to be critical for CRPC growth. The glutamine antagonist 6-diazo-5-oxo-l-norleucine (DON) blocks both carbon and nitrogen pathways but has dose-limiting toxicity. The prodrug DRP-104 is expected to be preferentially converted to DON in tumor cells to inhibit glutamine utilization with minimal toxicity. However, CRPC cells' susceptibility to DRP-104 remains unclear. METHODS Human PCa cell lines (LNCaP, LAPC4, C4-2/MDVR, PC-3, 22RV1, NCI-H660) were treated with DRP-104, and effects on proliferation and cell death were assessed. Unbiased metabolic profiling and isotope tracing evaluated the effects of DRP-104 on glutamine pathways. Efficacy of DRP-104 in vivo was evaluated in a mouse xenograft model of neuroendocrine PCa, NCI-H660. RESULTS DRP-104 inhibited proliferation and induced apoptosis in CRPC cell lines. Metabolite profiling showed decreases in the tricarboxylic acid cycle and nucleotide synthesis metabolites. Glutamine isotope tracing confirmed the blockade of both carbon pathway and nitrogen pathways. DRP-104 treated CRPC cells were rescued by the addition of nucleosides. DRP-104 inhibited neuroendocrine PCa xenograft growth without detectable toxicity. CONCLUSIONS The prodrug DRP-104 blocks glutamine carbon and nitrogen utilization, thereby inhibiting CRPC growth and inducing apoptosis. Targeting glutamine metabolism pathways with DRP-104 represents a promising therapeutic strategy for CRPC.
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Affiliation(s)
- David Moon
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - J Spencer Hauck
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Xue Jiang
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Holly Quang
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Lingfan Xu
- Urology Department, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Fan Zhang
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Xia Gao
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
- Department of Pediatrics, Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas, USA
| | - Robert Wild
- Dracen Pharmaceuticals, Inc., San Diego, California, USA
| | - Jeffrey I Everitt
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Everardo Macias
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Yiping He
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Jiaoti Huang
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA
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Hauck JS, Moon D, Jiang X, Wang ME, Zhao Y, Xu L, Quang H, Butler W, Chen M, Macias E, Gao X, He Y, Huang J. Heat shock factor 1 directly regulates transsulfuration pathway to promote prostate cancer proliferation and survival. Commun Biol 2024; 7:9. [PMID: 38172561 PMCID: PMC10764307 DOI: 10.1038/s42003-023-05727-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 12/19/2023] [Indexed: 01/05/2024] Open
Abstract
There are limited therapeutic options for patients with advanced prostate cancer (PCa). We previously found that heat shock factor 1 (HSF1) expression is increased in PCa and is an actionable target. In this manuscript, we identify that HSF1 regulates the conversion of homocysteine to cystathionine in the transsulfuration pathway by altering levels of cystathionine-β-synthase (CBS). We find that HSF1 directly binds the CBS gene and upregulates CBS mRNA levels. Targeting CBS decreases PCa growth and induces tumor cell death while benign prostate cells are largely unaffected. Combined inhibition of HSF1 and CBS results in more pronounced inhibition of PCa cell proliferation and reduction of transsulfuration pathway metabolites. Combination of HSF1 and CBS knockout decreases tumor size for a small cell PCa xenograft mouse model. Our study thus provides new insights into the molecular mechanism of HSF1 function and an effective therapeutic strategy against advanced PCa.
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Affiliation(s)
- J Spencer Hauck
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - David Moon
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Xue Jiang
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Mu-En Wang
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Yue Zhao
- Department of Pathology, College of Basic Medical Sciences, and the First Hospital of China Medical University, No.77 Puhe Road, Shenyang North New Area, 110122, Shenyang, China
| | - Lingfan Xu
- Urology Department, First Affiliated Hospital of Anhui Medical University, 218 Jixi Road, 230001, Hefei, China
| | - Holly Quang
- Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, 1100 Bates Ave One Baylor Plaza, Houston, TX, 77030, USA
| | - William Butler
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Ming Chen
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Everardo Macias
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Xia Gao
- Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, 1100 Bates Ave One Baylor Plaza, Houston, TX, 77030, USA
- Department of Molecular and Cellular Biology, 1100 Bates Ave Baylor College of Medicine, Houston, TX, USA
| | - Yiping He
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Jiaoti Huang
- Department of Pathology and Duke Cancer Institute, Duke University School of Medicine, Room 301M, Duke South DUMC 3712, 40 Duke Medicine Circle, Durham, NC, 27710, USA.
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Mitachi K, Ariake K, Shima H, Sato S, Miura T, Maeda S, Ishida M, Mizuma M, Ohtsuka H, Kamei T, Igarashi K, Unno M. Novel candidate factors predicting the effect of S-1 adjuvant chemotherapy of pancreatic cancer. Sci Rep 2021; 11:6541. [PMID: 33753854 PMCID: PMC7985196 DOI: 10.1038/s41598-021-86099-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 03/10/2021] [Indexed: 12/03/2022] Open
Abstract
The collagen gel droplet-embedded drug sensitivity test (CD-DST) was revealed to be useful for predicting the effect of S-1 adjuvant chemotherapy for pancreatic ductal adenocarcinoma (PDAC). However, collection of an adequate number of PDAC cells is difficult due to the surrounding fibroblasts. Thus, the aim of this study was to discover novel biomarkers to predict chemosensitivity based on the CD-DST results. Proteomics analysis was performed using liquid chromatography tandem mass spectrometry (LC–MS/MS). Candidate proteins were validated in patients with 5-FU CD-DST results via immunohistochemistry (IHC). The relationships between the candidate proteins and the effect of the adjuvant S-1 were investigated via IHC. Among the 2696 proteins extracted by LC–MS/MS, C1TC and SAHH could accurately predict the CD-DST results. Recurrence-free survival (RFS) was significantly improved in the IHC-positive group compared with the IHC-negative group in both factors. The negative group did not show a significant difference from the group that did not receive S-1. The double-positive group was associated with significantly prolonged RFS compared to the no adjuvant chemotherapy group. C1TC and SAHH have been shown to be useful biomarkers for predicting 5-FU sensitivity as a substitute for the CD-DST in adjuvant chemotherapy for PDAC.
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Affiliation(s)
- Katsutaka Mitachi
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kyohei Ariake
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan.
| | - Hiroki Shima
- Department of Biochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Satoko Sato
- Department of Pathology, Tohoku University Hospital, Sendai, Japan
| | - Takayuki Miura
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Shimpei Maeda
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Masaharu Ishida
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Masamichi Mizuma
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hideo Ohtsuka
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Takashi Kamei
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kazuhiko Igarashi
- Department of Biochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
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Guéant JL, Oussalah A, Zgheib R, Siblini Y, Hsu SB, Namour F. Genetic, epigenetic and genomic mechanisms of methionine dependency of cancer and tumor-initiating cells: What could we learn from folate and methionine cycles. Biochimie 2020; 173:123-128. [PMID: 32289469 DOI: 10.1016/j.biochi.2020.03.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 03/26/2020] [Accepted: 03/29/2020] [Indexed: 01/07/2023]
Abstract
Methionine-dependency is a common feature of cancer cells, which cannot proliferate without constant inputs of exogenous methionine even in the presence of its precursor, homocysteine. The endogenous synthesis of methionine is catalyzed by methionine synthase, which transfers the methyl group of 5-methyltetrahydrofolate (5-methylTHF) to homocysteine in the presence of vitamin B12 (cobalamin, cbl). Diverse mechanisms can produce it, including somatic mutations, aberrant DNA methylation (epimutations) and altered expression of genes. Around twenty somatic mutations have been reported as a cause of methionine dependency. Some of them are contributors but not sufficient on their own to cause methionine dependency. Epigenetic invalidation of MMACHC gene expression triggers methionine dependency of the MeWo-LC1 melanoma cancer cell line. This epimutation is generated by aberrant antisense transcription of the adjacent gene PRDX1. Methionine dependency involves the abnormal expression of 1-CM genes in cancer stem cells. It is related to an increased demand for methionine and SAM, which is not compensated by the increased production of formate by glycine decarboxylase pathway in lung cancer tumor spheres. Tumor spheres of glioblastoma U251 are methionine-dependent through disruption of folate metabolism. The rescue of the growth of glioblastoma stem cells by folate shows the considerable importance to evaluate the influence of supplements and dietary intake of folate on the risk of tumor development, in particular in countries subjected to mandatory food fortification in folic acid. Dietary methionine restriction or the use of methioninase represent promising anticancer therapeutic strategies that deserve to be explored in combination with chemotherapy.
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Affiliation(s)
- Jean-Louis Guéant
- INSERM UMR_S 1256 NGERE - Nutrition, Genetics, and Environmental Risk Exposure and National Center of Inborn Errors of Metabolism, University of Lorraine, Nancy (Vandoeuvre-lès-Nancy), F-54000, France.
| | - Abderrahim Oussalah
- INSERM UMR_S 1256 NGERE - Nutrition, Genetics, and Environmental Risk Exposure and National Center of Inborn Errors of Metabolism, University of Lorraine, Nancy (Vandoeuvre-lès-Nancy), F-54000, France
| | - Racha Zgheib
- INSERM UMR_S 1256 NGERE - Nutrition, Genetics, and Environmental Risk Exposure and National Center of Inborn Errors of Metabolism, University of Lorraine, Nancy (Vandoeuvre-lès-Nancy), F-54000, France
| | - Youssef Siblini
- INSERM UMR_S 1256 NGERE - Nutrition, Genetics, and Environmental Risk Exposure and National Center of Inborn Errors of Metabolism, University of Lorraine, Nancy (Vandoeuvre-lès-Nancy), F-54000, France
| | - Shyuefang Battaglia Hsu
- INSERM UMR_S 1256 NGERE - Nutrition, Genetics, and Environmental Risk Exposure and National Center of Inborn Errors of Metabolism, University of Lorraine, Nancy (Vandoeuvre-lès-Nancy), F-54000, France
| | - Fares Namour
- INSERM UMR_S 1256 NGERE - Nutrition, Genetics, and Environmental Risk Exposure and National Center of Inborn Errors of Metabolism, University of Lorraine, Nancy (Vandoeuvre-lès-Nancy), F-54000, France
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Wanders D, Hobson K, Ji X. Methionine Restriction and Cancer Biology. Nutrients 2020; 12:nu12030684. [PMID: 32138282 PMCID: PMC7146589 DOI: 10.3390/nu12030684] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 02/28/2020] [Accepted: 03/01/2020] [Indexed: 12/17/2022] Open
Abstract
The essential amino acid, methionine, is important for cancer cell growth and metabolism. A growing body of evidence indicates that methionine restriction inhibits cancer cell growth and may enhance the efficacy of chemotherapeutic agents. This review summarizes the efficacy and mechanism of action of methionine restriction on hallmarks of cancer in vitro and in vivo. The review highlights the role of glutathione formation, polyamine synthesis, and methyl group donation as mediators of the effects of methionine restriction on cancer biology. The translational potential of the use of methionine restriction as a personalized nutritional approach for the treatment of patients with cancer is also discussed.
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Affiliation(s)
| | | | - Xiangming Ji
- Correspondence: ; Tel.: 404-413-1242; Fax: 404-413-1228
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Lieu EL, Nguyen T, Rhyne S, Kim J. Amino acids in cancer. Exp Mol Med 2020; 52:15-30. [PMID: 31980738 PMCID: PMC7000687 DOI: 10.1038/s12276-020-0375-3] [Citation(s) in RCA: 387] [Impact Index Per Article: 96.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 11/24/2019] [Accepted: 12/02/2019] [Indexed: 01/22/2023] Open
Abstract
Over 90 years ago, Otto Warburg's seminal discovery of aerobic glycolysis established metabolic reprogramming as one of the first distinguishing characteristics of cancer1. The field of cancer metabolism subsequently revealed additional metabolic alterations in cancer by focusing on central carbon metabolism, including the citric acid cycle and pentose phosphate pathway. Recent reports have, however, uncovered substantial non-carbon metabolism contributions to cancer cell viability and growth. Amino acids, nutrients vital to the survival of all cell types, experience reprogrammed metabolism in cancer. This review outlines the diverse roles of amino acids within the tumor and in the tumor microenvironment. Beyond their role in biosynthesis, they serve as energy sources and help maintain redox balance. In addition, amino acid derivatives contribute to epigenetic regulation and immune responses linked to tumorigenesis and metastasis. Furthermore, in discussing the transporters and transaminases that mediate amino acid uptake and synthesis, we identify potential metabolic liabilities as targets for therapeutic intervention.
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Affiliation(s)
- Elizabeth L. Lieu
- 0000 0001 2175 0319grid.185648.6Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL USA
| | - Tu Nguyen
- 0000 0001 2175 0319grid.185648.6Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL USA
| | - Shawn Rhyne
- 0000 0001 2175 0319grid.185648.6Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL USA
| | - Jiyeon Kim
- 0000 0001 2175 0319grid.185648.6Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL USA
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Jo YK, Park MH, Choi H, Lee H, Park JM, Sim JJ, Chang C, Jeong KY, Kim HM. Enhancement of the Antitumor Effect of Methotrexate on Colorectal Cancer Cells via Lactate Calcium Salt Targeting Methionine Metabolism. Nutr Cancer 2017; 69:663-673. [PMID: 28353361 DOI: 10.1080/01635581.2017.1299879] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Guénin S, Morvan D, Thivat E, Stepien G, Demidem A. Combined methionine deprivation and chloroethylnitrosourea have time-dependent therapeutic synergy on melanoma tumors that NMR spectroscopy-based metabolomics explains by methionine and phospholipid metabolism reprogramming. Nutr Cancer 2009; 61:518-29. [PMID: 19838924 DOI: 10.1080/01635580902803727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Methionine (Met) deprivation stress (MDS) is proposed in association with chemotherapy in the treatment of some cancers. A synergistic effect of this combination is generally acknowledged. However, little is known on the mechanism of the response to this therapeutic strategy. A model of B16 melanoma tumor in vivo was treated by MDS alone and in combination with chloroethylnitrosourea (CENU). It was applied recent developments in proton-NMR spectroscopy-based metabolomics for providing information on the metabolic response of tumors to MDS and combination with chemotherapy. MDS inhibited tumor growth during the deprivation period and growth resumption thereafter. The combination of MDS with CENU induced an effective time-dependent synergy on growth inhibition. Metabolite profiling during MDS showed a decreased Met content (P < 0.01) despite the preservation of the protein content, disorders in sulfur-containing amino acids, glutamine/proline, and phospholipid metabolism [increase of glycerophosphorylcholine (P < 0.01), decrease in phosphocholine (P < 0.05)]. The metabolic profile of MDS combined with CENU and ANOVA analysis revealed the implication of Met and phospholipid metabolism in the observed synergy, which may be interpreted as a Met-sparing metabolic reprogramming of tumors. It follows that combination therapy of MDS with CENU seems to intensify adaptive processes, which may set limitations to this therapeutic strategy.
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Fu YM, Meadows GG. Specific amino acid dependency regulates the cellular behavior of melanoma. J Nutr 2007; 137:1591S-1596S; discussion 1597S-1598S. [PMID: 17513432 DOI: 10.1093/jn/137.6.1591s] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Relative specific amino acid dependency is one of the metabolic abnormalities of melanoma cells and metabolic studies of this dependency are in their infancy. Herein, we review the current studies in this area and present new information that adds to the understanding of how tyrosine (Tyr) and phenylalanine (Phe) dependency as well as other amino acids regulate the cell behaviors of melanoma cells. Amino acid dependency of human melanoma cells is multifactorial and restricting Tyr and Phe to melanoma triggers a series of alterations in metabolic and signaling pathways in a time-ordered fashion to alter different cellular behaviors. For example, at early time points, the reduction of Tyr and Phe alters metabolic reactions quantitatively or qualitatively. The alterations include modulation of integrin/focal adhesion kinase (FAK)/G protein pathways and the plasminogen activator (PA)/PA inhibitor pathways to inhibit tumor cell invasion. At later time periods, a further drop in intracellular amino acids induces more metabolic alterations to impact the FAK/Ras/Raf and Bcl-2 pathways leading to apoptosis. The threshold effects and the targeting of multiple pathways by restriction of specific amino acids provide a connection between the metabolic alterations and signaling pathways that modulate the cellular behaviors of melanoma cells. Decoding the metabolic alterations that connect amino acid concentration to the crucial step(s) in signaling is important and an exciting area of cancer research.
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Affiliation(s)
- Ya-Min Fu
- Cancer Prevention and Research Center, Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, WA 99164-6713, USA
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Fu YM, Zhang H, Ding M, Li YQ, Fu X, Yu ZX, Meadows GG. Selective amino acid restriction targets mitochondria to induce apoptosis of androgen-independent prostate cancer cells. J Cell Physiol 2006; 209:522-34. [PMID: 16897757 DOI: 10.1002/jcp.20766] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Relative specific amino acid dependency is one of the metabolic abnormalities of cancer cells, and restriction of specific amino acids induces apoptosis of prostate cancer cells. This study shows that restriction of tyrosine and phenylalanine (Tyr/Phe), glutamine (Gln), or methionine (Met), modulates Raf and Akt survival pathways and affects the function of mitochondria in DU145 and PC3, in vitro. These three restrictions inhibit energy production (ATP synthesis) and induce generation of reactive oxygen species (ROS). Restriction of Tyr/Phe or Met in DU145 and Met in PC3 reduces mitochondrial membrane potential (DeltaPsim) and induces caspase-dependent and -independent apoptosis. In DU145, Tyr/Phe or Met restriction reduces activity of Akt, mitochondrial distribution of phosphorylated Raf and apoptosis inducing factor (AIF), and increases mitochondrial distribution of Bak. Mitochondrial Bcl-XL is increased in Tyr/Phe-restricted but decreased in Met-restricted cells. Under Tyr/Phe or Met restriction, reduced mitochondrial Raf does not inactivate the pro-apoptotic function of Bak. Tyr/Phe restriction also inhibits Bcl-2 and Met restriction inhibits Bcl-XL in mitochondria. These comprehensive actions damage the integrity of the mitochondria and induce apoptosis of DU145. In PC3, apoptosis induced by Met restriction was not associated with alterations in intracellular distribution of Raf, Bcl-2 family proteins, or AIF. All of the amino acid restrictions inhibited Akt activity in this cell line. We conclude that specific amino acid restriction differentially interferes with homeostasis/balance between the Raf and Akt survival pathways and with the interaction of Raf and Bcl-2 family proteins in mitochondria to induce apoptosis of DU145 and PC3 cells.
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Affiliation(s)
- Ya-Min Fu
- Cancer Prevention and Research Center, Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, Washington 99164-6713, USA
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Morvan D, Demidem A, Guenin S, Madelmont JC. Methionine-dependence phenotype of tumors: Metabolite profiling in a melanoma model usingL-[methyl-13C]methionine and high-resolution magic angle spinning1H–13C nuclear magnetic resonance spectroscopy. Magn Reson Med 2006; 55:984-96. [PMID: 16598721 DOI: 10.1002/mrm.20869] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Tumors frequently have abnormal L-methionine (Met) metabolism, the so-called Met-dependence phenotype that refers to the inability to proliferate in the absence of Met. However, the origin of this phenotype is still unknown and may arise from one of several pathways of Met metabolism. To help characterize the metabolic features of Met-dependent/independent phenotypes, the fate of the methyl carbon of L-[methyl-13C]Met was chased in a murine model of malignant melanoma (B16-F1) in vitro and in vivo. Growth curves under Met restriction showed that melanoma cells in vitro were Met-independent, whereas implanted melanoma tumors in vivo were Met-dependent. Label-assisted high-resolution magic angle spinning 1H-13C NMR spectroscopy metabolite profiling showed that, in vitro, creatine and phosphatidylcholine 13C-enrichments were poor, but S-adenosyl-Met and posttranslationally N-methylated protein signals were strong. In contrast, in vivo, creatine and phosphatidylcholine enrichments were strong but S-adenosyl-Met and N-methylated protein signals were poor. In addition, in vivo, transsulfuration was very efficient, consumed one-carbon units originating from the methyl carbon of Met, and yielded taurine labeling. From these data, the Met-dependent/independent phenotypes appear closely related to the source of one-carbon units. Thus, L-[methyl-13C]Met-assisted NMR spectroscopy metabolite profiling allowed the discrimination between Met-dependence and Met-independence and provided novel mechanistic information on their origin.
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