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Yu Y, Martins LM. Mitochondrial One-Carbon Metabolism and Alzheimer's Disease. Int J Mol Sci 2024; 25:6302. [PMID: 38928008 PMCID: PMC11203557 DOI: 10.3390/ijms25126302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 05/13/2024] [Accepted: 05/15/2024] [Indexed: 06/28/2024] Open
Abstract
Mitochondrial one-carbon metabolism provides carbon units to several pathways, including nucleic acid synthesis, mitochondrial metabolism, amino acid metabolism, and methylation reactions. Late-onset Alzheimer's disease is the most common age-related neurodegenerative disease, characterised by impaired energy metabolism, and is potentially linked to mitochondrial bioenergetics. Here, we discuss the intersection between the molecular pathways linked to both mitochondrial one-carbon metabolism and Alzheimer's disease. We propose that enhancing one-carbon metabolism could promote the metabolic processes that help brain cells cope with Alzheimer's disease-related injuries. We also highlight potential therapeutic avenues to leverage one-carbon metabolism to delay Alzheimer's disease pathology.
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Affiliation(s)
- Yizhou Yu
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge CB2 1QR, UK
| | - L. Miguel Martins
- MRC Toxicology Unit, University of Cambridge, Gleeson Building, Tennis Court Road, Cambridge CB2 1QR, UK
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2
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Ambekar YS, Caiaffa CD, Wlodarczyk BJ, Singh M, Schill AW, Steele JW, Zhang J, Aglyamov SR, Scarcelli G, Finnell RH, Larin KV. Optical coherence tomography-guided Brillouin microscopy highlights regional tissue stiffness differences during anterior neural tube closure in the Mthfd1l murine mutant. Development 2024; 151:dev202475. [PMID: 38682273 PMCID: PMC11165724 DOI: 10.1242/dev.202475] [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: 11/03/2023] [Accepted: 04/18/2024] [Indexed: 05/01/2024]
Abstract
Neurulation is a highly synchronized biomechanical process leading to the formation of the brain and spinal cord, and its failure leads to neural tube defects (NTDs). Although we are rapidly learning the genetic mechanisms underlying NTDs, the biomechanical aspects are largely unknown. To understand the correlation between NTDs and tissue stiffness during neural tube closure (NTC), we imaged an NTD murine model using optical coherence tomography (OCT), Brillouin microscopy and confocal fluorescence microscopy. Here, we associate structural information from OCT with local stiffness from the Brillouin signal of embryos undergoing neurulation. The stiffness of neuroepithelial tissues in Mthfd1l null embryos was significantly lower than that of wild-type embryos. Additionally, exogenous formate supplementation improved tissue stiffness and gross embryonic morphology in nullizygous and heterozygous embryos. Our results demonstrate the significance of proper tissue stiffness in normal NTC and pave the way for future studies on the mechanobiology of normal and abnormal embryonic development.
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Affiliation(s)
| | - Carlo Donato Caiaffa
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX 77030, USA
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin, Austin, TX 78723, USA
| | - Bogdan J. Wlodarczyk
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX 77030, USA
| | - Manmohan Singh
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
| | - Alexander W. Schill
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
| | - John W. Steele
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jitao Zhang
- Department of Biomedical Engineering, Wayne State University, Detroit, MI 48201, USA
| | - Salavat R. Aglyamov
- Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA
| | - Giuliano Scarcelli
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Richard H. Finnell
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX 77030, USA
| | - Kirill V. Larin
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
- Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030, USA
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3
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Katinas JM, Nayeen MJ, Schneider M, Shah K, Fifer AN, Klapper LM, Sharma A, Thalluri K, Van Nieuwenhze MS, Hou Z, Gangjee A, Matherly LH, Dann CE. Structural Characterization of 5-Substituted Pyrrolo[3,2- d]pyrimidine Antifolate Inhibitors in Complex with Human Serine Hydroxymethyl Transferase 2. Biochemistry 2024. [PMID: 38324671 DOI: 10.1021/acs.biochem.3c00613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
We previously discovered first-in-class multitargeted 5-substituted pyrrolo[3,2-d]pyrimidine antifolates that inhibit serine hydroxymethyltransferase 2 (SHMT2), resulting in potent in vitro and in vivo antitumor efficacies. In this report, we present crystallographic structures for SHMT2 in complex with an expanded series of pyrrolo[3,2-d]pyrimidine compounds with variations in bridge length (3-5 carbons) and the side chain aromatic ring (phenyl, thiophene, fluorine-substituted phenyl, and thiophene). We evaluated structural features of the inhibitor-SHMT2 complexes and correlations to inhibitor potencies (i.e., Kis), highlighting conserved polar contacts and identifying 5-carbon bridge lengths as key determinants of inhibitor potency. Based on the analysis of SHMT2 structural data, we investigated the impact of mutation of Tyr105 in SHMT2 kinetic analysis and studies with HCT116 cells with inducible expression of wild-type and Y105F SHMT2. Increased enzyme inhibition potency by the pyrrolo[3,2-d]pyrimidine inhibitors with Phe105 SHMT2 accompanied an increased growth inhibition of Phe105-expressing HCT116 cells compared to wild-type SHMT2. Pyrrolo[3,2-d]pyrimidine inhibitors with polyglutamate modifications were evaluated for potencies against SHMT2. We determined the crystal structures of SHMT2 in complex with our lead antifolate AGF347 lacking L-glutamate, or as a diglutamate and triglutamate, for comparison with parent AGF347. These data provide the first insights into the influence of antifolate polyglutamylation on SHMT2:inhibitor interactions. Collectively, our results provide new insights into the critical structural determinants of SHMT2 binding by pyrrolo[3,2-d]pyrimidine inhibitors as novel antitumor agents, as well as the first structural characterization of human SHMT2 in complex with polyglutamates of an SHMT2-targeted antifolate.
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Affiliation(s)
- Jade M Katinas
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Md Junayed Nayeen
- School of Pharmacy & Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Mathew Schneider
- Barbara Ann Karmanos Cancer Institute, Department of Oncology, Wayne State University, 4100 John R, Detroit, Michigan 48201, United States
| | - Khushbu Shah
- School of Pharmacy & Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Alexandra N Fifer
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Lily M Klapper
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Abhishekh Sharma
- School of Pharmacy & Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Kishore Thalluri
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | | | - Zhanjun Hou
- Barbara Ann Karmanos Cancer Institute, Department of Oncology, Wayne State University, 4100 John R, Detroit, Michigan 48201, United States
| | - Aleem Gangjee
- School of Pharmacy & Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Larry H Matherly
- Barbara Ann Karmanos Cancer Institute, Department of Oncology, Wayne State University, 4100 John R, Detroit, Michigan 48201, United States
| | - Charles E Dann
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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4
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Tsai YC, Huang SP, Cheng WC, Fan YC, Lin YC, Tsai SY, Huang CY, Yu CC, Lin VC, Geng JH, Li CY, Lu TL, Bao BY. Identifying the role of MTHFD1L in prostate cancer progression from genetic analysis and experimental validation. Am J Cancer Res 2024; 14:169-181. [PMID: 38323273 PMCID: PMC10839318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 12/15/2023] [Indexed: 02/08/2024] Open
Abstract
One-carbon metabolism plays a crucial role in tumorigenesis as it supplies the one-carbon units necessary for nucleotide synthesis, epigenetic regulation, and redox metabolism, ensuring the rapid proliferation of cancer cells. However, their roles in prostate cancer progression remain poorly understood. In this study, we investigated the association between genetic variants in the one-carbon metabolism pathway and clinical outcomes in patients receiving androgen deprivation therapy for prostate cancer. The associations of 130 single-nucleotide polymorphisms located within 14 genes involved in the one-carbon metabolism pathway with cancer-specific survival (CSS), overall survival, and progression-free survival were assessed using Cox regression in 630 patients with prostate cancer. Subsequently, functional studies were performed using prostate cancer cell lines. After adjusting for covariates and multiple testing, MTHFD1L rs2073190 was found to be significantly associated with CSS (P = 0.000184). Further pooled analysis of multiple datasets demonstrated that MTHFD1L was upregulated in prostate cancer and increased MTHFD1L expression was positively correlated with tumor aggressiveness and poor patient prognosis. Functionally, MTHFD1L knockdown suppressed prostate cancer cell proliferation and colony formation. RNA sequencing and pathway analysis revealed that differentially expressed genes were predominantly enriched in the cell cycle pathway. In conclusion, genetic variants in MTHFD1L of one-carbon metabolism may serve as promising predictors, and our findings offer valuable insights into the underlying genetic mechanisms of prostate cancer progression.
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Affiliation(s)
- Yuan-Chin Tsai
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical UniversityTaipei 110, Taiwan
- Ph.D. Program for Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University and Academia SinicaTaipei 110, Taiwan
| | - Shu-Pin Huang
- Department of Urology, Kaohsiung Medical University HospitalKaohsiung 807, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical UniversityKaohsiung 807, Taiwan
- Ph.D. Program in Environmental and Occupational Medicine, College of Medicine, Kaohsiung Medical UniversityKaohsiung 807, Taiwan
- Institute of Medical Science and Technology, College of Medicine, National Sun Yat-Sen UniversityKaohsiung 804, Taiwan
| | - Wei-Chung Cheng
- Ph.D. Program for Cancer Biology and Drug Discovery, Cancer Biology and Precision Therapeutics Center, China Medical UniversityTaichung 404, Taiwan
| | - Yu-Ching Fan
- Ph.D. Program for Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University and Academia SinicaTaipei 110, Taiwan
| | - Ya-Ching Lin
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical UniversityTaipei 110, Taiwan
| | - Shin-Yu Tsai
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical UniversityTaipei 110, Taiwan
| | - Chao-Yuan Huang
- Department of Urology, National Taiwan University Hospital, College of Medicine, National Taiwan UniversityTaipei 100, Taiwan
| | - Chia-Cheng Yu
- Division of Urology, Department of Surgery, Kaohsiung Veterans General HospitalKaohsiung 813, Taiwan
- Department of Urology, School of Medicine, National Yang-Ming UniversityTaipei 112, Taiwan
- Department of Pharmacy, Tajen UniversityPingtung 907, Taiwan
| | - Victor C Lin
- Department of Urology, E-Da HospitalKaohsiung 824, Taiwan
- School of Medicine for International Students, I-Shou UniversityKaohsiung 840, Taiwan
| | - Jiun-Hung Geng
- Department of Urology, Kaohsiung Medical University HospitalKaohsiung 807, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical UniversityKaohsiung 807, Taiwan
- Department of Urology, Kaohsiung Municipal Hsiao-Kang HospitalKaohsiung 812, Taiwan
| | - Chia-Yang Li
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical UniversityKaohsiung 807, Taiwan
- Department of Medical Research, Kaohsiung Medical University HospitalKaohsiung 807, Taiwan
| | - Te-Ling Lu
- Department of Pharmacy, China Medical UniversityTaichung 406, Taiwan
| | - Bo-Ying Bao
- Department of Pharmacy, China Medical UniversityTaichung 406, Taiwan
- Sex Hormone Research Center, China Medical University HospitalTaichung 404, Taiwan
- Department of Nursing, Asia UniversityTaichung 413, Taiwan
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5
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The negative effect of G1958A polymorphism on MTHFD1 protein stability and HCC growth. Cell Oncol (Dordr) 2023; 46:735-744. [PMID: 36913067 DOI: 10.1007/s13402-023-00780-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/28/2023] [Indexed: 03/14/2023] Open
Abstract
PURPOSE Methylenetetrahydrofolate dehydrogenase (MTHFD1), a key enzyme on the folate pathway, has been implicated in the tumor development of distinct types of cancers. The single nucleotide polymorphism (SNP) of 1958G > A mutation in the coding region of MTHFD1 (arginine 653 is mutated into glutamine) has been detected in a significant proportion of clinical samples of hepatocellular carcinoma (HCC). METHODS : Hepatoma cell lines, 97H and Hep3B were used. The expression of MTHFD1 and SNP mutation protein was determined by immunoblotting analysis. The protein ubiquitination of MTHFD1 was detected by immunoprecipitation analysis. The post-translational modification sites and interacting proteins of MTHFD1 in the presence of G1958A SNP were identified by mass spectrometry. Metabolic flux analysis was used to detect the synthesis of relevant metabolites sourced from serine isotope. RESULTS The present study showed G1958A SNP of MTHFD1, encoding MTHFD1 R653Q, was associated with the attenuated protein stability caused by ubiquitination-mediated protein degradation. Mechanistically, MTHFD1 R653Q displayed an enhanced binding to the E3 ligase TRIM21, which was responsible for the augmented ubiquitination, and MTHFD1 K504 was identified to be the primary ubiquitination site. The subsequent metabolite analysis revealed MTHFD1 R653Q resulted in the repressed flux of serine-derived methyl group into metabolite precursors for purine synthesis, and the compromised purine synthesis was demonstrated to be responsible for the impeded growth capability in MTHFD1 R653Q-expressing cells. Moreover, the suppressive effect of MTHFD1 R653Q expression in tumorigenesis was verified by xenograft analysis, and the relationship between MTHFD1 G1958A SNP and its protein levels was revealed in clinical human liver cancer specimens. CONCLUSION Our results uncovered an unidentified mechanism underlying of the impact of G1958A SNP on MTHFD1 protein stability and tumor metabolism in HCC. which provides a molecular basis for the according clinical management when considering MTHFD1 as a therapeutic target.
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Zhou J, Yang Y, Cheng J, Luan S, Xiao X, Li X, Fang P, Gu Y, Shang Q, Zhang H, Chen L, Zeng X, Yuan Y. MTHFD1L confers a poor prognosis and malignant phenotype in esophageal squamous cell carcinoma by activating the ERK5 signaling pathway. Exp Cell Res 2023; 427:113584. [PMID: 37004948 DOI: 10.1016/j.yexcr.2023.113584] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 03/05/2023] [Accepted: 03/28/2023] [Indexed: 04/03/2023]
Abstract
MTHFD1L, a key enzyme of folate metabolism, is seldom reported in cancer. In this study, we investigate the role of MTHFD1L in the tumorigenicity of esophageal squamous cell carcinoma (ESCC). ESCC tissue microarrays (TMAs) containing samples from 177 patients were utilized to evaluate whether MTHFD1L expression, determined using immunohistochemical analysis, is a prognostic indicator for ESCC patients. The function of MTHFD1L in the migration of ESCC cells was studied with wound healing, Transwell, and three-dimensional spheroid invasion assays in vitro and a lung metastasis mouse model in vivo. The mRNA microarrays and Ingenuity pathway analysis (IPA) were used to explore the downstream of MTHFD1L. Elevated expression of MTHFD1L in ESCC tissues was significantly associated with poor differentiation and prognosis. These phenotypic assays revealed that MTHFD1L significantly promote the viability and metastasis of ESCC cell in vivo and in vitro. Further detailed analyses of the molecular mechanism demonstrated that the ESCC progression driven by MTHFD1L was through up-regulation ERK5 signaling pathways. These findings reveal that MTHFD1L is positively associated with the aggressive phenotype of ESCC by activating ERK5 signaling pathways, suggesting that MTHFD1L is a new biomarker and a potential molecular therapeutic target for ESCC.
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Affiliation(s)
- Jianfeng Zhou
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yushang Yang
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jiahan Cheng
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Siyuan Luan
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xin Xiao
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xiaokun Li
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Pinhao Fang
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yimin Gu
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Qixin Shang
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Hanlu Zhang
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Longqi Chen
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xiaoxi Zeng
- Biomedical Big Data Center of West China Hospital, Med+X Center for Informatics, Sichuan University, Chengdu, 610041, China
| | - Yong Yuan
- Department of Thoracic Surgery, Med+X Center for Informatics, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Huang M, Xue J, Chen Z, Zhou X, Chen M, Sun J, Xu Z, Wang S, Xu H, Du Z, Liu M. MTHFD2 suppresses glioblastoma progression via the inhibition of ERK1/2 phosphorylation. Biochem Cell Biol 2023; 101:112-124. [PMID: 36493392 DOI: 10.1139/bcb-2022-0291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma (GBM) is a WHO grade 4 tumor and is the most malignant form of glioma. Methylenetetrahydrofolate dehydrogenase 2 (MTHFD2), a mitochondrial enzyme involved in folate metabolism, has been reported to be highly expressed in several human tumors. However, little is known about the role of MTHFD2 in GBM. In this study, we aimed to explore the biological functions of MTHFD2 in GBM and identify the associated mechanisms. We performed experiments such as immunohistochemistry, Western blot, and transwell assays and found that MTHFD2 expression was lower in high-grade glioma than in low-grade glioma. Furthermore, a high expression of MTHFD2 was associated with a favorable prognosis, and MTHFD2 levels showed good prognostic accuracy for glioma patients. The overexpression of MTHFD2 could inhibit the migration, invasion, and proliferation of GBM cells, whereas its knockdown induced the opposite effect. Mechanistically, our findings revealed that MTHFD2 suppressed GBM progression independent of its enzymatic activity, likely by inducing cytoskeletal remodeling through the regulation of extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation, thereby influencing GBM malignance. Collectively, these findings uncover a potential tumor-suppressor role of MTHFD2 in GBM cells. MTHFD2 may act as a promising diagnostic and therapeutic target for GBM treatment.
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Affiliation(s)
- Meihui Huang
- Department of Central Laboratory, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Jiajian Xue
- Department of Neurosurgery, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Zhiming Chen
- Department of Pathology, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Xiao Zhou
- Department of Central Laboratory, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Mantong Chen
- Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Jianhong Sun
- Department of Pathology, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Zhennan Xu
- Department of Neurosurgery, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Shaohong Wang
- Department of Pathology, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Haixiong Xu
- Department of Neurosurgery, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Zepeng Du
- Department of Central Laboratory, Shantou Central Hospital, Shantou 515031, Guangdong, China
- Department of Pathology, Shantou Central Hospital, Shantou 515031, Guangdong, China
| | - Mingfa Liu
- Department of Neurosurgery, Shantou Central Hospital, Shantou 515031, Guangdong, China
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Lin YS, Chen YC, Chen TE, Cheng ML, Lynn KS, Shah P, Chen JS, Huang RFS. Probing Folate-Responsive and Stage-Sensitive Metabolomics and Transcriptional Co-Expression Network Markers to Predict Prognosis of Non-Small Cell Lung Cancer Patients. Nutrients 2022; 15:nu15010003. [PMID: 36615660 PMCID: PMC9823804 DOI: 10.3390/nu15010003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/06/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022] Open
Abstract
Tumour metabolomics and transcriptomics co-expression network as related to biological folate alteration and cancer malignancy remains unexplored in human non-small cell lung cancers (NSCLC). To probe the diagnostic biomarkers, tumour and pair lung tissue samples (n = 56) from 97 NSCLC patients were profiled for ultra-performance liquid chromatography tandem mass spectrometry (UPLC/MS/MS)-analysed metabolomics, targeted transcriptionomics, and clinical folate traits. Weighted Gene Co-expression Network Analysis (WGCNA) was performed. Tumour lactate was identified as the top VIP marker to predict advance NSCLC (AUC = 0.765, Sig = 0.017, CI 0.58-0.95). Low folate (LF)-tumours vs. adjacent lungs displayed higher glycolytic index of lactate and glutamine-associated amino acids in enriched biological pathways of amino sugar and glutathione metabolism specific to advance NSCLCs. WGCNA classified the green module for hub serine-navigated glutamine metabolites inversely associated with tumour and RBC folate, which module metabolites co-expressed with a predominant up-regulation of LF-responsive metabolic genes in glucose transport (GLUT1), de no serine synthesis (PHGDH, PSPH, and PSAT1), folate cycle (SHMT1/2 and PCFR), and down-regulation in glutaminolysis (SLC1A5, SLC7A5, GLS, and GLUD1). The LF-responsive WGCNA markers predicted poor survival rates in lung cancer patients, which could aid in optimizing folate intervention for better prognosis of NSCLCs susceptible to folate malnutrition.
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Affiliation(s)
- Yu-Shun Lin
- Department of Nutritional Science, Fu Jen Catholic University, New Taipei City 242062, Taiwan
| | - Yen-Chu Chen
- Department of Nutritional Science, Fu Jen Catholic University, New Taipei City 242062, Taiwan
| | - Tzu-En Chen
- Department of Nutritional Science, Fu Jen Catholic University, New Taipei City 242062, Taiwan
| | - Mei-Ling Cheng
- Metabolomics Core Laboratory, Healthy Aging Research Center, Chang Gung University, Taoyuan 33302, Taiwan
| | - Ke-Shiuan Lynn
- Department of Mathematics, Fu Jen Catholic University, New Taipei City 242062, Taiwan
| | - Pramod Shah
- Department of Nutritional Science, Fu Jen Catholic University, New Taipei City 242062, Taiwan
- Praexisio Taiwan Inc., New Taipei City 22180, Taiwan
| | - Jin-Shing Chen
- Division of Thoracic Surgery, Department of Surgery, National Taiwan University Hospital, Taipei 100225, Taiwan
- Correspondence: (J.-S.C.); (R.-F.S.H.); Tel.: +886-2-2905-2512 (R.-F.S.H.)
| | - Rwei-Fen S. Huang
- Department of Nutritional Science, Fu Jen Catholic University, New Taipei City 242062, Taiwan
- Correspondence: (J.-S.C.); (R.-F.S.H.); Tel.: +886-2-2905-2512 (R.-F.S.H.)
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9
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Scaletti ER, Gustafsson Westergren R, Andersson Y, Wiita E, Henriksson M, Homan EJ, Jemth A, Helleday T, Stenmark P. The First Structure of Human MTHFD2L and Its Implications for the Development of Isoform-Selective Inhibitors. ChemMedChem 2022; 17:e202200274. [PMID: 35712863 PMCID: PMC9796130 DOI: 10.1002/cmdc.202200274] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/15/2022] [Indexed: 01/01/2023]
Abstract
Methylenetetrahydrofolate dehydrogenase 2 (MTHFD2) is a mitochondrial 1-carbon metabolism enzyme, which is an attractive anticancer drug target as it is highly upregulated in cancer but is not expressed in healthy adult cells. Selective MTHFD2 inhibitors could therefore offer reduced side-effects during treatment, which are common with antifolate drugs that target other 1C-metabolism enzymes. This task is challenging however, as MTHFD2 shares high sequence identity with the constitutively expressed isozymes cytosolic MTHFD1 and mitochondrial MTHFD2L. In fact, one of the most potent MTHFD2 inhibitors reported to date, TH7299, is actually more active against MTHFD1 and MTHFD2L. While structures of MTHFD2 and MTHFD1 exist, no MTHFD2L structures are available. We determined the first structure of MTHFD2L and its complex with TH7299, which reveals the structural basis for its highly potent MTHFD2L inhibition. Detailed analysis of the MTHFD2L structure presented here clearly highlights the challenges associated with developing truly isoform-selective MTHFD2 inhibitors.
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Affiliation(s)
- Emma R. Scaletti
- Department of Biochemistry and BiophysicsStockholm UniversitySvante Arrhenius väg 16 CStockholm106 91Sweden
| | | | - Yasmin Andersson
- Drug Discovery and Development Platform, Science for Life Laboratory School of BiotechnologyRoyal Institute of TechnologyTomtebodavägen 23aStockholm17165Sweden
| | - Elisee Wiita
- Science for Life LaboratoryDepartment of Oncology-PathologyKarolinska InstituteTomtebodavägen 23aStockholm171 65Sweden
| | - Martin Henriksson
- Science for Life LaboratoryDepartment of Oncology-PathologyKarolinska InstituteTomtebodavägen 23aStockholm171 65Sweden
| | - Evert J. Homan
- Science for Life LaboratoryDepartment of Oncology-PathologyKarolinska InstituteTomtebodavägen 23aStockholm171 65Sweden
| | - Ann‐Sofie Jemth
- Science for Life LaboratoryDepartment of Oncology-PathologyKarolinska InstituteTomtebodavägen 23aStockholm171 65Sweden
| | - Thomas Helleday
- Science for Life LaboratoryDepartment of Oncology-PathologyKarolinska InstituteTomtebodavägen 23aStockholm171 65Sweden,Department of Oncology and MetabolismThe University of SheffieldBeech Hill RoadSheffieldS10 2RXUK
| | - Pål Stenmark
- Department of Biochemistry and BiophysicsStockholm UniversitySvante Arrhenius väg 16 CStockholm106 91Sweden
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10
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Sah N, Stenhouse C, Halloran KM, Moses RM, Seo H, Burghardt RC, Johnson GA, Wu G, Bazer FW. Inhibition of SHMT2 mRNA translation increases embryonic mortality in sheep. Biol Reprod 2022; 107:1279-1295. [DOI: 10.1093/biolre/ioac152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 06/22/2022] [Accepted: 07/19/2022] [Indexed: 11/13/2022] Open
Abstract
Abstract
The one-carbon metabolism (OCM) pathway provides purines and thymidine for synthesis of nucleic acids required for cell division, and S-adenosyl methionine for polyamine and creatine syntheses and the epigenetic regulation of gene expression. This study aimed to determine if serine hydroxymethyltransferase 2 (SHMT2), a key enzyme in the OCM pathway, is critical for ovine trophectoderm (oTr) cell function and conceptus development by inhibiting translation of SHMT2 mRNA using a morpholino antisense oligonucleotide (MAO). In vitro treatment of oTr cells with MAO-SHMT2 decreased expression of SHMT2 protein, which was accompanied by reduced proliferation (P = 0.053) and migration (P < 0.05) of those cells. Intrauterine injection of MAO-SHMT2 in ewes on Day 11 post-breeding tended to decrease the overall pregnancy rate (on Days 16 and 18) compared to MAO-control (3/10 vs 7/10, P = 0.07). The three viable conceptuses (n = 2 on Day 16 and n = 1 on Day 18) recovered from MAO-SHMT2 ewes had only partial inhibition of SHMT2 mRNA translation. Conceptuses from the three pregnant MAO-SHMT2 ewes had similar levels of expression of mRNAs and proteins involved in OCM as compared to conceptuses from MAO-control ewes. These results indicate that knockdown of SHMT2 protein reduces proliferation and migration of oTr cells (in vitro) to decrease elongation of blastocysts from spherical to elongated forms. These in vitro effects suggest that increased embryonic deaths in ewes treated with MAO-SHMT2 are the result of decreased SHMT2-mediated trophectoderm cell proliferation and migration supporting a role for the OCM pathway in survival and development of ovine conceptuses.
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Affiliation(s)
- Nirvay Sah
- Department of Animal Science , Texas A&M University, College Station, TX, USA
| | - Claire Stenhouse
- Department of Animal Science , Texas A&M University, College Station, TX, USA
| | | | - Robyn M Moses
- Department of Animal Science , Texas A&M University, College Station, TX, USA
| | - Heewon Seo
- Department of Veterinary Integrative Biosciences , College of Veterinary Medicine and Biomedical Sciences, College Station, TX, USA
| | - Robert C Burghardt
- Department of Veterinary Integrative Biosciences , College of Veterinary Medicine and Biomedical Sciences, College Station, TX, USA
| | - Gregory A Johnson
- Department of Veterinary Integrative Biosciences , College of Veterinary Medicine and Biomedical Sciences, College Station, TX, USA
| | - Guoyao Wu
- Department of Animal Science , Texas A&M University, College Station, TX, USA
| | - Fuller W Bazer
- Department of Animal Science , Texas A&M University, College Station, TX, USA
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11
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The catalytic mechanism of the mitochondrial methylenetetrahydrofolate dehydrogenase/cyclohydrolase (MTHFD2). PLoS Comput Biol 2022; 18:e1010140. [PMID: 35613161 PMCID: PMC9173628 DOI: 10.1371/journal.pcbi.1010140] [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: 12/01/2021] [Revised: 06/07/2022] [Accepted: 04/26/2022] [Indexed: 11/19/2022] Open
Abstract
Methylenetetrahydrofolate dehydrogenase/cyclohydrolase (MTHFD2) is a new drug target that is expressed in cancer cells but not in normal adult cells, which provides an Achilles heel to selectively kill cancer cells. Despite the availability of crystal structures of MTHFD2 in the inhibitor- and cofactor-bound forms, key information is missing due to technical limitations, including (a) the location of absolutely required Mg2+ ion, and (b) the substrate-bound form of MTHFD2. Using computational modeling and simulations, we propose that two magnesium ions are present at the active site whereby (i) Arg233, Asp225, and two water molecules coordinate MgA2+, while MgA2+ together with Arg233 stabilize the inorganic phosphate (Pi); (ii) Asp168 and three water molecules coordinate MgB2+, and MgB2+ further stabilizes Pi by forming a hydrogen bond with two oxygens of Pi; (iii) Arg201 directly coordinates the Pi; and (iv) through three water-mediated interactions, Asp168 contributes to the positioning and stabilization of MgA2+, MgB2+ and Pi. Our computational study at the empirical valence bond level allowed us also to elucidate the detailed reaction mechanisms. We found that the dehydrogenase activity features a proton-coupled electron transfer with charge redistribution connected to the reorganization of the surrounding water molecules which further facilitates the subsequent cyclohydrolase activity. The cyclohydrolase activity then drives the hydration of the imidazoline ring and the ring opening in a concerted way. Furthermore, we have uncovered that two key residues, Ser197/Arg233, are important factors in determining the cofactor (NADP+/NAD+) preference of the dehydrogenase activity. Our work sheds new light on the structural and kinetic framework of MTHFD2, which will be helpful to design small molecule inhibitors that can be used for cancer treatment.
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12
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Quevedo-Ocampo J, Escobedo-Calvario A, Souza-Arroyo V, Miranda-Labra RU, Bucio-Ortiz L, Gutiérrez-Ruiz MC, Chávez-Rodríguez L, Gomez-Quiroz LE. Folate Metabolism in Hepatocellular Carcinoma. What Do We Know So Far? Technol Cancer Res Treat 2022; 21:15330338221144446. [PMID: 36503290 DOI: 10.1177/15330338221144446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Cancer cells are characterized by accelerated proliferation and an outstanding adaptation of their metabolic pathways to meet energy demands. The folate cycle, also known as folate metabolism or one-carbon metabolism, through enzymatic interconversions, provides metabolites necessary for nucleotide synthesis, methylation, and reduction power, helping to maintain the high rate of proliferation; therefore, the study of this metabolic pathway is of great importance in the study of cancer. Moreover, multiple enzymes involved in this cycle have been implicated in different types of cancer, corroborating the cell's adaptations under this pathology. During the last decade, nonalcoholic fatty liver disease has emerged as the leading etiology related to the rise in the incidence and deaths of hepatocellular carcinoma. Specifically, cholesterol accumulation has been a determinant promoter of tumor formation, with solid evidence that an enriched-cholesterol diet plays a crucial role in accelerating the development of an aggressive subtype of hepatocellular carcinoma compared to other models. In this review, we will discuss the most recent findings to understand the contribution of folate metabolism to cancer cells and tumor microenvironment while creating a link between the dynamics given by cholesterol and methylenetetrahydrofolate dehydrogenase 1-like, a key enzyme of the cycle located in the mitochondrial compartment.
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Affiliation(s)
- Jaqueline Quevedo-Ocampo
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metrolitana-Iztapalapa, Mexico City, Mexico
| | - Alejandro Escobedo-Calvario
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metrolitana-Iztapalapa, Mexico City, Mexico
| | - Verónica Souza-Arroyo
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional IIB/UNAM, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Roxana U Miranda-Labra
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional IIB/UNAM, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Leticia Bucio-Ortiz
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional IIB/UNAM, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - María C Gutiérrez-Ruiz
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional IIB/UNAM, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
| | - Lisette Chávez-Rodríguez
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metrolitana-Iztapalapa, Mexico City, Mexico
| | - Luis E Gomez-Quiroz
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, 27786Universidad Autónoma Metropolitana-Iztapalapa, Mexico City, Mexico.,Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional IIB/UNAM, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
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13
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Bischof C, Mirtschink P, Yuan T, Wu M, Zhu C, Kaur J, Pham MD, Gonzalez-Gonoggia S, Hammer M, Rogg EM, Sharma R, Bottermann K, Gercken B, Hagag E, Berthonneche C, Sossalla S, Stehr SN, Maxeiner J, Duda MA, Latreille M, Zamboni N, Martelli F, Pedrazzini T, Dimmeler S, Krishnan J. Mitochondrial-cell cycle cross-talk drives endoreplication in heart disease. Sci Transl Med 2021; 13:eabi7964. [PMID: 34878823 DOI: 10.1126/scitranslmed.abi7964] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Corinne Bischof
- MRC Clinical Sciences Centre, Imperial College London, London W12 0NN, UK.,Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Peter Mirtschink
- Institute of Clinical Chemistry and Laboratory Medicine, Department of Clinical Pathobiochemistry, University Hospital Dresden, Fetscherstasse 74, 01307 Dresden, Germany
| | - Ting Yuan
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Department of Medicine III, Division of Cardiology/Nephrology/Angiology, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Meiqian Wu
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Department of Medicine III, Division of Cardiology/Nephrology/Angiology, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Chaonan Zhu
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Department of Medicine III, Division of Cardiology/Nephrology/Angiology, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Jaskiran Kaur
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Department of Medicine III, Division of Cardiology/Nephrology/Angiology, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Minh Duc Pham
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Genome Biologics, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | | | - Marie Hammer
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Eva-Maria Rogg
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Rahul Sharma
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Katharina Bottermann
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Bettina Gercken
- Institute of Clinical Chemistry and Laboratory Medicine, Department of Clinical Pathobiochemistry, University Hospital Dresden, Fetscherstasse 74, 01307 Dresden, Germany
| | - Eman Hagag
- Institute of Clinical Chemistry and Laboratory Medicine, Department of Clinical Pathobiochemistry, University Hospital Dresden, Fetscherstasse 74, 01307 Dresden, Germany
| | - Corinne Berthonneche
- Cardiovascular Assessment Facility, University of Lausanne, CHUV, CH-1011 Lausanne, Switzerland
| | - Samuel Sossalla
- Department of Internal Medicine II, University Medical Center Regensburg, 93053 Regensburg, Germany.,Klinik für Kardiologie und Pneumologie, Georg-August-Universität Goettingen, DZHK (German Centre for Cardiovascular Research), Robert-Koch Str. 40, D-37075 Goettingen, Germany
| | - Sebastian N Stehr
- Department of Anesthesiology and Critical Care Medicine, University Hospital Leipzig, Liebigstrasse 20, D-04103 Leipzig, Germany
| | - Joachim Maxeiner
- Genome Biologics, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Maria Anna Duda
- Genome Biologics, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
| | - Mathieu Latreille
- MRC Clinical Sciences Centre, Imperial College London, London W12 0NN, UK
| | - Nicola Zamboni
- Institute of Molecular Systems Biology, ETH Zurich, Zurich 8093, Switzerland
| | - Fabio Martelli
- Molecular Cardiology Laboratory, IRCCS-Policlinico San Donato, 20097, San Donato Milanese, Milan, Italy
| | - Thierry Pedrazzini
- Department of Medicine, University of Lausanne Medical School, CHUV, MP14-220, 1011 Lausanne, Switzerland
| | - Stefanie Dimmeler
- Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,DZHK Partner Site RheinMain, Mainz, Germany.,Cardio-Pulmonary Institute, Giessen, Germany
| | - Jaya Krishnan
- MRC Clinical Sciences Centre, Imperial College London, London W12 0NN, UK.,Institute of Cardiovascular Regeneration, Centre for Molecular Medicine, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Department of Medicine III, Division of Cardiology/Nephrology/Angiology, Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.,Cardio-Pulmonary Institute, Giessen, Germany
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14
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Ganini C, Amelio I, Bertolo R, Candi E, Cappello A, Cipriani C, Mauriello A, Marani C, Melino G, Montanaro M, Natale ME, Tisone G, Shi Y, Wang Y, Bove P. Serine and one-carbon metabolisms bring new therapeutic venues in prostate cancer. Discov Oncol 2021; 12:45. [PMID: 35201488 PMCID: PMC8777499 DOI: 10.1007/s12672-021-00440-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 10/14/2021] [Indexed: 11/23/2022] Open
Abstract
Serine and one-carbon unit metabolisms are essential biochemical pathways implicated in fundamental cellular functions such as proliferation, biosynthesis of important anabolic precursors and in general for the availability of methyl groups. These two distinct but interacting pathways are now becoming crucial in cancer, the de novo cytosolic serine pathway and the mitochondrial one-carbon metabolism. Apart from their role in physiological conditions, such as epithelial proliferation, the serine metabolism alterations are associated to several highly neoplastic proliferative pathologies. Accordingly, prostate cancer shows a deep rearrangement of its metabolism, driven by the dependency from the androgenic stimulus. Several new experimental evidence describes the role of a few of the enzymes involved in the serine metabolism in prostate cancer pathogenesis. The aim of this study is to analyze gene and protein expression data publicly available from large cancer specimens dataset, in order to further dissect the potential role of the abovementioned metabolism in the complex reshaping of the anabolic environment in this kind of neoplasm. The data suggest a potential role as biomarkers as well as in cancer therapy for the genes (and enzymes) belonging to the one-carbon metabolism in the context of prostatic cancer.
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Affiliation(s)
- Carlo Ganini
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- IDI-IRCCS, Rome, Italy
| | - Ivano Amelio
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
| | - Riccardo Bertolo
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- San Carlo di Nancy Hospital, Rome, Italy
| | - Eleonora Candi
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- IDI-IRCCS, Rome, Italy
| | - Angela Cappello
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- IDI-IRCCS, Rome, Italy
| | - Chiara Cipriani
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- San Carlo di Nancy Hospital, Rome, Italy
| | - Alessandro Mauriello
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
| | - Carla Marani
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- San Carlo di Nancy Hospital, Rome, Italy
| | - Gerry Melino
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
| | - Manuela Montanaro
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
| | - Maria Emanuela Natale
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- San Carlo di Nancy Hospital, Rome, Italy
| | - Giuseppe Tisone
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
| | - Yufang Shi
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai, 200031 China
- The First Affiliated Hospital of Soochow University and State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University, 199 Renai Road, Suzhou, 215123 Jiangsu China
| | - Ying Wang
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai, 200031 China
| | - Pierluigi Bove
- Department of Experimental Medicine, Torvergata Oncoscience Research Centre of Excellence, TOR, University of Rome Tor Vergata, a Montpellier 1, 00133 Rome, Italy
- San Carlo di Nancy Hospital, Rome, Italy
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15
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Jog R, Chen G, Wang J, Leff T. Hormonal regulation of glycine decarboxylase and its relationship to oxidative stress. Physiol Rep 2021; 9:e14991. [PMID: 34342168 PMCID: PMC8329434 DOI: 10.14814/phy2.14991] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 07/15/2021] [Indexed: 01/16/2023] Open
Abstract
In both humans and rodent models, circulating glycine levels are significantly reduced in obesity, glucose intolerance, type II diabetes, and non-alcoholic fatty liver disease. The glycine cleavage system and its rate-limiting enzyme, glycine decarboxylase (GLDC), is a major determinant of plasma glycine levels. The goals of this study were to determine if the increased expression of GLDC contributes to the reduced plasma glycine levels seen in disease states, to characterize the hormonal regulation of GLDC gene expression, and to determine if altered GLDC expression has physiological effects that might affect the development of diabetes. The findings presented here show that hepatic GLDC gene expression is elevated in mouse models of obesity and diabetes, as well as by fasting. We demonstrated that GLDC gene expression is strongly regulated by the metabolic hormones glucagon and insulin, and we identified the signaling pathways involved in this regulation. Finally, we found that GLDC expression is linked to glutathione levels, with increased expression associated with elevated levels of glutathione and reduced expression associated with a suppression of glutathione and increased cellular ROS levels. These findings suggest that the hormonal regulation of GLDC contributes not only to the changes in circulating glycine levels seen in metabolic disease, but also affects glutathione production, possibly as a defense against metabolic disease-associated oxidative stress.
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Affiliation(s)
- Ruta Jog
- Department of PathologyCenter for Integrative Endocrine and Metabolic ResearchWayne State University School of MedicineDetroitMIUSA
| | - Guohua Chen
- Department of PathologyCenter for Integrative Endocrine and Metabolic ResearchWayne State University School of MedicineDetroitMIUSA
| | - Jian Wang
- Department of PathologyCenter for Integrative Endocrine and Metabolic ResearchWayne State University School of MedicineDetroitMIUSA
| | - Todd Leff
- Department of PathologyCenter for Integrative Endocrine and Metabolic ResearchWayne State University School of MedicineDetroitMIUSA
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16
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Moya GE, Rivera PD, Dittenhafer-Reed KE. Evidence for the Role of Mitochondrial DNA Release in the Inflammatory Response in Neurological Disorders. Int J Mol Sci 2021; 22:7030. [PMID: 34209978 PMCID: PMC8268735 DOI: 10.3390/ijms22137030] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/25/2021] [Accepted: 06/26/2021] [Indexed: 12/21/2022] Open
Abstract
Mitochondria are regarded as the metabolic centers of cells and are integral in many other cell processes, including the immune response. Each mitochondrion contains numerous copies of mitochondrial DNA (mtDNA), a small, circular, and bacterial-like DNA. In response to cellular damage or stress, mtDNA can be released from the mitochondrion and trigger immune and inflammatory responses. mtDNA release into the cytosol or bloodstream can occur as a response to hypoxia, sepsis, traumatic injury, excitatory cytotoxicity, or drastic mitochondrial membrane potential changes, some of which are hallmarks of neurodegenerative and mood disorders. Released mtDNA can mediate inflammatory responses observed in many neurological and mood disorders by driving the expression of inflammatory cytokines and the interferon response system. The current understanding of the role of mtDNA release in affective mood disorders and neurodegenerative diseases will be discussed.
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Affiliation(s)
| | - Phillip D. Rivera
- Department of Chemistry and Biology, Hope College, Holland, MI 49423, USA;
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17
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Vaughn A, DeHoog RJ, Eberlin LS, Appling DR. Metabotype analysis of Mthfd1l-null mouse embryos using desorption electrospray ionization mass spectrometry imaging. Anal Bioanal Chem 2021; 413:3573-3582. [PMID: 33829277 DOI: 10.1007/s00216-021-03308-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/15/2021] [Accepted: 03/22/2021] [Indexed: 01/07/2023]
Abstract
Mammalian folate-dependent one-carbon (1C) metabolism provides the building blocks essential during development via amino acid interconversion, methyl-donor production, regeneration of redox factors, and de novo purine and thymidylate synthesis. Folate supplementation prevents many neural tube defects (NTDs) that occur during the embryonic process of neurulation. The mechanism by which folate functions during neurulation is not well understood, and not all NTDs are preventable by folate supplementation. Mthfd1l is a mitochondrial 1C metabolism enzyme that produces formate, a 1C donor that fuels biosynthesis and the methyl cycle in the cytoplasm. Homozygous deletion of the Mthfd1l gene in mice (Mthfd1lz/z) causes embryonic lethality, developmental delay, and folate-resistant NTDs. These mice also have defects in cranial mesenchyme formation. In this work, mass spectrometry imaging was used to obtain ion maps of the cranial mesenchyme that identified the spatial distribution and relative abundance of metabolites in wild-type and Mthfd1lz/z embryos. The relative abundances of purine and thymidylate derivatives, as well as amino acids, were diminished in the cranial mesenchyme of Mthfd1lz/z embryos. Loss of Mthfd1l activity in this region also led to abnormal levels of methionine and dysregulated energy metabolism. These alterations in metabolism suggest possible approaches to preventing NTDs in humans.
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Affiliation(s)
- Amanda Vaughn
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Rachel J DeHoog
- Department of Chemistry, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Livia S Eberlin
- Department of Chemistry, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Dean R Appling
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, 78712, USA.
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18
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Simoni-Nieves A, Salas-Silva S, Chávez-Rodríguez L, Escobedo-Calvario A, Desoteux M, Bucio L, Souza V, Miranda-Labra RU, Muñoz-Espinosa LE, Coulouarn C, Gutiérrez-Ruiz MC, Marquardt JU, Gomez-Quiroz LE. The Consumption of Cholesterol-Enriched Diets Conditions the Development of a Subtype of HCC with High Aggressiveness and Poor Prognosis. Cancers (Basel) 2021; 13:cancers13071721. [PMID: 33917315 PMCID: PMC8038696 DOI: 10.3390/cancers13071721] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/19/2021] [Accepted: 03/09/2021] [Indexed: 12/16/2022] Open
Abstract
Simple Summary It is well known that non-alcoholic fatty liver disease is an important risk factor in the development of hepatocellular carcinoma, but the implication of cholesterol in this subject remains unclear, especially in western countries where its consumption is particularly elevated. This work provides evidence of a cholesterol-related transcriptional fingerprint and its implications in the progression and aggressiveness of hepatocellular carcinoma with remarkable interest in clinical practice. Abstract Non-alcoholic fatty liver disease (NAFLD) and progression to non-alcoholic steatohepatitis (NASH) result as a consequence of diverse conditions, mainly unbalanced diets. Particularly, high-fat and cholesterol content, as well as carbohydrates, such as those commonly ingested in Western countries, frequently drive adverse metabolic alterations in the liver and promote NAFLD development. Lipid liver overload is also one of the main risk factors for initiation and progression of hepatocellular carcinoma (HCC), but detailed knowledge on the relevance of high nutritional cholesterol remains elusive. We were aimed to characterize HCC development in mice fed with a Western diet (high in lipids and cholesterol) and to identify molecular alterations that define a subtype of liver cancer induced by lipid overload. Mice under western or high cholesterol diets more frequently developed tumors with a more aggressive phenotype than animals fed with a chow diet. Associated changes involved macrophage infiltration, angiogenesis, and stemness features. RNA-seq revealed a specific gene expression signature (Slc41a; Fabp5; Igdcc4 and Mthfd1l) resembling the adverse phenotypic features and poor clinical outcomes seen in patients with HCC. In conclusion; consumption of lipid enriched diets; particularly cholesterol; could accelerate HCC development with an aggressive phenotype and poor prognosis
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Affiliation(s)
- Arturo Simoni-Nieves
- Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metropolitana Iztapalapa, Mexico City 09340, Mexico; (A.S.-N.); (S.S.-S.); (L.C.-R.); (A.E.-C.)
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
| | - Soraya Salas-Silva
- Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metropolitana Iztapalapa, Mexico City 09340, Mexico; (A.S.-N.); (S.S.-S.); (L.C.-R.); (A.E.-C.)
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
| | - Lisette Chávez-Rodríguez
- Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metropolitana Iztapalapa, Mexico City 09340, Mexico; (A.S.-N.); (S.S.-S.); (L.C.-R.); (A.E.-C.)
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
| | - Alejandro Escobedo-Calvario
- Posgrado en Biología Experimental, DCBS, Universidad Autónoma Metropolitana Iztapalapa, Mexico City 09340, Mexico; (A.S.-N.); (S.S.-S.); (L.C.-R.); (A.E.-C.)
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
| | - Matthis Desoteux
- Centre de Lutte contre le Cancer Eugène Marquis, Inserm, Univ Rennes, COSS (Chemistry, Oncogenesis Stress Signaling), UMR_S 1242, 35042 Rennes, France; (M.D.); (C.C.)
| | - Leticia Bucio
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
- Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional, IIB, UNAM/Instituto Nacional de Cardiología Ignacio Chavez, Mexico City 14080, Mexico
| | - Verónica Souza
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
- Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional, IIB, UNAM/Instituto Nacional de Cardiología Ignacio Chavez, Mexico City 14080, Mexico
| | - Roxana U. Miranda-Labra
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
- Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional, IIB, UNAM/Instituto Nacional de Cardiología Ignacio Chavez, Mexico City 14080, Mexico
| | - Linda E. Muñoz-Espinosa
- Liver Unit, Department of Internal Medicine, “Dr. José E. González” University Hospital, Universidad Autónoma de Nuevo León, Monterrey 64460, NL, Mexico;
| | - Cédric Coulouarn
- Centre de Lutte contre le Cancer Eugène Marquis, Inserm, Univ Rennes, COSS (Chemistry, Oncogenesis Stress Signaling), UMR_S 1242, 35042 Rennes, France; (M.D.); (C.C.)
| | - María Concepción Gutiérrez-Ruiz
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
- Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional, IIB, UNAM/Instituto Nacional de Cardiología Ignacio Chavez, Mexico City 14080, Mexico
| | - Jens U. Marquardt
- Department of Medicine I, University Hospital Schleswig-Holstein, 23562 Lübeck, Germany;
| | - Luis E. Gomez-Quiroz
- Área de Medicina Experimental y Traslacional, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Mexico City 09340, Mexico; (L.B.); (V.S.); (R.U.M.-L.); (M.C.G.-R.)
- Laboratorio de Medicina Experimental, Unidad de Medicina Traslacional, IIB, UNAM/Instituto Nacional de Cardiología Ignacio Chavez, Mexico City 14080, Mexico
- Correspondence: ; Tel./Fax: +55-58044730
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19
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Qu Y, Hao C, Zhai R, Yao W. Folate and macrophage folate receptor-β in idiopathic pulmonary fibrosis disease: the potential therapeutic target? Biomed Pharmacother 2020; 131:110711. [DOI: 10.1016/j.biopha.2020.110711] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 08/10/2020] [Accepted: 08/28/2020] [Indexed: 02/07/2023] Open
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20
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Reina-Campos M, Diaz-Meco MT, Moscat J. The complexity of the serine glycine one-carbon pathway in cancer. J Cell Biol 2020; 219:jcb.201907022. [PMID: 31690618 PMCID: PMC7039202 DOI: 10.1083/jcb.201907022] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 09/09/2019] [Accepted: 09/19/2019] [Indexed: 12/21/2022] Open
Abstract
Perturbations in cellular metabolism are ubiquitous in cancer. Here Reina-Campos et al. review the role of one-carbon metabolism in tumorigenesis. The serine glycine and one-carbon pathway (SGOCP) is a crucially important metabolic network for tumorigenesis, of unanticipated complexity, and with implications in the clinic. Solving how this network is regulated is key to understanding the underlying mechanisms of tumor heterogeneity and therapy resistance. Here, we review its role in cancer by focusing on key enzymes with tumor-promoting functions and important products of the SGOCP that are of physiological relevance for tumorigenesis. We discuss the regulatory mechanisms that coordinate the metabolic flux through the SGOCP and their deregulation, as well as how the actions of this metabolic network affect other cells in the tumor microenvironment, including endothelial and immune cells.
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Affiliation(s)
- Miguel Reina-Campos
- Cancer Metabolism and Signaling Networks Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA
| | - Maria T Diaz-Meco
- Cancer Metabolism and Signaling Networks Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA
| | - Jorge Moscat
- Cancer Metabolism and Signaling Networks Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA
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21
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Taiwo TE, Cao X, Cabrera RM, Lei Y, Finnell RH. Approaches to studying the genomic architecture of complex birth defects. Prenat Diagn 2020; 40:1047-1055. [PMID: 32468575 DOI: 10.1002/pd.5760] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/18/2020] [Accepted: 05/23/2020] [Indexed: 12/20/2022]
Abstract
Every year nearly 6 percent of children worldwide are born with a serious congenital malformation, resulting in death or lifelong disability. In the United States, birth defects remain one of the leading causes of infant mortality. Among the common structural congenital defects are conditions known as neural tube defects (NTDs). These are a class of malformation of the brain and spinal cord where the neural tube fails to close during the neurulation. Although NTDs remain among the most pervasive and debilitating of all human developmental anomalies, there is insufficient understanding of their etiology. Previous studies have proposed that complex birth defects like NTDs are likely omnigenic, involving interconnected gene regulatory networks with associated signals throughout the genome. Advances in technologies have allowed researchers to more critically investigate regulatory gene networks in ever increasing detail, informing our understanding of the genetic basis of NTDs. Employing a systematic analysis of these complex birth defects using massively parallel DNA sequencing with stringent bioinformatic algorithms, it is possible to approach a greater level of understanding of the genomic architecture underlying NTDs. Herein, we present a brief overview of different approaches undertaken in our laboratory to dissect out the genetics of susceptibility to NTDs. This involves the use of mouse models to identify candidate genes, as well as large scale whole genome/whole exome (WGS/WES) studies to interrogate the genomic landscape of NTDs. The goal of this research is to elucidate the gene-environment interactions contributing to NTDs, thus encouraging global research efforts in their prevention.
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Affiliation(s)
- Toluwani E Taiwo
- Rice University, Houston, Texas, USA.,Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA
| | - Xuanye Cao
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Robert M Cabrera
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Yunping Lei
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Richard H Finnell
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, USA.,Departments of Molecular and Human Genetics and Medicine, Baylor College of Medicine, Houston, Texas, USA
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22
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Wang L, Yang Y, Wang XM, Wang CQ, Zhang YM, Li BL. MTHFD1L as a folate cycle enzyme correlates with prognostic outcome and its knockdown impairs cell invasive behaviors in osteosarcoma via mediating the AKT/mTOR pathway. J Recept Signal Transduct Res 2020; 40:584-590. [PMID: 32456526 DOI: 10.1080/10799893.2020.1769658] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Osteosarcoma (OS) is the most frequent primary malignancy initially in bone with multiple genomic aberrations. Methylenetetrahydrofolate dehydrogenase 1-like (MTHFD1L) is linked with the progression of diverse tumors. However, its function in OS is not understood completely. The expression pattern and prognostic significance of MTHFD1L in OS tissues were analyzed based on GEO database. The expression level of MTHFD1L in OS cell lines was explored by qRT-PCR. The cell proliferation, colony formation ability, invasion as well as migration in OS cells after MTHFD1L knockdown were determined using cell counting kit 8 (CCK-8) assay, colony formation and transwell methods. GSEA analysis was performed to predict the underlying mechanisms of MTHFD1L in OS development. Furthermore, the western blot was utilized to study the influence of MTHFD1L on AKT/mTOR pathway. Our results indicated that MTHFD1L expression was significantly up-regulated in OS tissues and cells compared with normal tissues and cells. High expression of MTHFD1L could lead to poor prognosis of OS patients. Cell proliferation, colony formation ability, migration and invasion were blocked because of reduced MTHFD1L in vitro. Moreover, cell cycle and AKT/mTOR pathway were all associated with MTHFD1L expression. In conclusion, the findings revealed that MTHFD1L might promote the development of OS via mediating cell cycle and AKT/mTOR pathway, indicating that MTHFD1L might act as a promising therapeutic target for OS treatment.
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Affiliation(s)
- Lei Wang
- Department of Joint Surgery, Affiliated Hospital of Jining Medical University, Jining, PR China
| | - Ya Yang
- Department of Oncology, Affiliated Hospital of Jining Medical University, Jining, PR China
| | - Xiu-Mei Wang
- Electroencephalogram Room, Affiliated Hospital of Jining Medical University, Jining, PR China
| | - Cheng-Qun Wang
- Department of Joint Surgery, Affiliated Hospital of Jining Medical University, Jining, PR China
| | - Yuan-Min Zhang
- Department of Joint Surgery, Affiliated Hospital of Jining Medical University, Jining, PR China
| | - Bing-Liang Li
- Department of Joint Surgery, Affiliated Hospital of Jining Medical University, Jining, PR China
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23
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Li AM, Ye J. Reprogramming of serine, glycine and one-carbon metabolism in cancer. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165841. [PMID: 32439610 DOI: 10.1016/j.bbadis.2020.165841] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 04/28/2020] [Accepted: 05/10/2020] [Indexed: 02/06/2023]
Abstract
Metabolic pathways leading to the synthesis, uptake, and usage of the nonessential amino acid serine are frequently amplified in cancer. Serine encounters diverse fates in cancer cells, including being charged onto tRNAs for protein synthesis, providing head groups for sphingolipid and phospholipid synthesis, and serving as a precursor for cellular glycine and one-carbon units, which are necessary for nucleotide synthesis and methionine cycle reloading. This review will focus on the participation of serine and glycine in the mitochondrial one-carbon (SGOC) pathway during cancer progression, with an emphasis on the genetic and epigenetic determinants that drive SGOC gene expression. We will discuss recently elucidated roles for SGOC metabolism in nucleotide synthesis, redox balance, mitochondrial function, and epigenetic modifications. Finally, therapeutic considerations for targeting SGOC metabolism in the clinic will be discussed.
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Affiliation(s)
- Albert M Li
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA 94305, USA; Cancer Biology Program, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Jiangbin Ye
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA 94305, USA; Cancer Biology Program, Stanford University School of Medicine, Stanford, CA 94305, USA; Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA 94305, USA.
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24
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Papadopoli DJ, Ma EH, Roy D, Russo M, Bridon G, Avizonis D, Jones RG, St-Pierre J. Methotrexate elicits pro-respiratory and anti-growth effects by promoting AMPK signaling. Sci Rep 2020; 10:7838. [PMID: 32398698 PMCID: PMC7217946 DOI: 10.1038/s41598-020-64460-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 04/15/2020] [Indexed: 12/20/2022] Open
Abstract
One-carbon metabolism fuels the high demand of cancer cells for nucleotides and other building blocks needed for increased proliferation. Although inhibitors of this pathway are widely used to treat many cancers, their global impact on anabolic and catabolic processes remains unclear. Using a combination of real-time bioenergetics assays and metabolomics approaches, we investigated the global effects of methotrexate on cellular metabolism. We show that methotrexate treatment increases the intracellular concentration of the metabolite AICAR, resulting in AMPK activation. Methotrexate-induced AMPK activation leads to decreased one-carbon metabolism gene expression and cellular proliferation as well as increased global bioenergetic capacity. The anti-proliferative and pro-respiratory effects of methotrexate are AMPK-dependent, as cells with reduced AMPK activity are less affected by methotrexate treatment. Conversely, the combination of methotrexate with the AMPK activator, phenformin, potentiates its anti-proliferative activity in cancer cells. These data highlight a reciprocal effect of methotrexate on anabolic and catabolic processes and implicate AMPK activation as a metabolic determinant of methotrexate response.
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Affiliation(s)
- David J Papadopoli
- Department of Biochemistry, McGill University, Montréal, QC, H3G 1Y6, Canada
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
| | - Eric H Ma
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
- Department of Physiology, McGill University, Montréal, QC, H3G 1Y6, Canada
- Center for Cancer and Cell Biology, Program in Metabolic and Nutritional Programming, Van Andel Research Institute, Grand Rapids, MI, 49503, USA
| | - Dominic Roy
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
| | - Mariana Russo
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
| | - Gaëlle Bridon
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
| | - Daina Avizonis
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
| | - Russell G Jones
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada
- Department of Physiology, McGill University, Montréal, QC, H3G 1Y6, Canada
- Center for Cancer and Cell Biology, Program in Metabolic and Nutritional Programming, Van Andel Research Institute, Grand Rapids, MI, 49503, USA
| | - Julie St-Pierre
- Department of Biochemistry, McGill University, Montréal, QC, H3G 1Y6, Canada.
- Goodman Cancer Research Centre, Montréal, QC, H3A 1A3, Canada.
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.
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25
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Brosnan ME, Tingley G, MacMillan L, Harnett B, Pongnopparat T, Marshall JD, Brosnan JT. Plasma Formate Is Greater in Fetal and Neonatal Rats Compared with Their Mothers. J Nutr 2020; 150:1068-1075. [PMID: 31912134 PMCID: PMC7198295 DOI: 10.1093/jn/nxz329] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 09/05/2019] [Accepted: 12/09/2019] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Formate can be incorporated into 10-formyl-tetrahydrofolate (10-formyl-THF), which is a substrate for purine synthesis, and after further reduction of the one-carbon group, may be used as a substrate for thymidylate synthesis and for homocysteine remethylation. OBJECTIVE We examined plasma formate concentrations and the expression of genes involved in the production and utilization of formate in fetal and neonatal rats and in pregnant and virgin female rats. METHODS In 1 experiment, plasma formate was measured by GC-MS in rats aged 1-56 d. In a second experiment, virgin female (adult) rats, 19-d pregnant rats (P) and their male and female fetuses (F), and 3-d-old (N) and 7-d-old (J) offspring had plasma and amniotic fluid analyzed for formate by GC-MS, mRNA abundance in liver and placenta by qPCR, and several plasma amino acids by HPLC. RESULTS The plasma formate concentration was significantly higher in fetuses at embryonic day 19 than in the mothers. It was also significantly higher in neonatal rats but slowly returned to adult concentrations by ∼3 wk. The abundance of mitochondrial monofunctional 10-formyl-tetrahydrofolate synthetase (Mthfd1l) mRNA was significantly higher in placenta (PP) and F liver than in liver of N or J. Expression of mitochondrial bifunctional NAD-dependent methylene-tetrahydrofolate dehydrogenase/methenyl-tetrahydrofolate cyclohydrolase (Mthfd2) was significantly enriched in PP and liver of P, intermediate in F liver, and much lower in liver of N and J, relative to PP. Serine hydroxymethyltransferase 2 (Shmt2), methylenetetrahydrofolate dehydrogenase 1 (Mthfd1), and glycine decarboxylase protein of the glycine cleavage system (Gldc) mRNA expression was significantly lower in PP compared with other groups. Cytoplasmic NAD(P)-dependent 10-formyl-tetrahydrofolate dehydrogenase (Aldh1/1) and mitochondrial NAD(P)-dependent 10-formyl-tetrahydrofolate dehydrogenase (Aldh1/2) , genes responsible for the catabolism of 10-formylTHF, were very weakly expressed in PP, low in livers of F and N, and reached the significantly higher adult levels in J. Serine, glycine, and methionine concentrations in plasma of F were significantly higher than in plasma of P. CONCLUSIONS Formate metabolism is highly active in fetuses and in placenta of pregnant rats.
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Affiliation(s)
- Margaret E Brosnan
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada,Address correspondence to MEB (e-mail: )
| | - Garrett Tingley
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada
| | - Luke MacMillan
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada
| | - Brian Harnett
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada
| | - Theerawat Pongnopparat
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada
| | - Jenika D Marshall
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada
| | - John T Brosnan
- Department of Biochemistry, Memorial University of Newfoundland, St Johns, Newfoundland, Canada
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26
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He Z, Wang X, Zhang H, Liang B, Zhang J, Zhang Z, Yang Y. High expression of folate cycle enzyme MTHFD1L correlates with poor prognosis and increased proliferation and migration in colorectal cancer. J Cancer 2020; 11:4213-4221. [PMID: 32368304 PMCID: PMC7196253 DOI: 10.7150/jca.35014] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 11/03/2019] [Indexed: 12/14/2022] Open
Abstract
Aims: To investigate the expression and clinical significance of methylenetetrahydrofolate dehydrogenase 1-like (MTHFD1L) in colorectal cancer (CRC) and its effect on CRC cells proliferation and migration. Methods: 59 fresh CRC tissue samples and matched normal tissues, 176 archive CRC tissue samples and 8 CRC cell lines were tested MTHFD1L by western blot and immunohistochemistry, respectively. The relationship between MTHFD1L expression, clinical significance and prognosis was analyzed by chi-square test and survival analysis. MTT assay, plate clonal formation assay and scratch assay were used to verify the effect of MTHFD1L on the proliferation and migration in CRC cell lines. Results: The results showed that the protein level of MTHFD1L in CRC was significantly higher than that in adjacent normal tissues (p<0.01). The expression of MTHFD1L in CRC was positively correlated with the degree of tumor differentiation, TNM classification, tumor invasion, lymph node metastasis, and distant metastasis. Survival analysis showed that CRC patients with high MTHFD1L expression had a lower 5-year survival rate and the expression of MTHFD1L was an independent adverse factor for the CRC prognosis (p<0.05). Down-regulation of MTHFD1L inhibited the proliferation and migration of DLD-1 and HCT116 CRC cell lines. Conclusion: These findings reveal that MTHFD1L is highly expressive in CRC and associated with poor prognosis, and MTHDF1L can increase colorectal cancer cell proliferation and migration. Therefore, MTHFD1L may serve as a predictor and a potential therapeutic target for CRC.
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Affiliation(s)
- Zhongyun He
- Department of Pathology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, PR, China
| | - Xia Wang
- Department of Pathology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, PR, China
| | - Huizhong Zhang
- Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, PR, China
| | - Baoxia Liang
- Department of Radiology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, PR, China
| | - Jinling Zhang
- Department of Radiology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, PR, China
| | - Zhenfeng Zhang
- Department of Radiology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, PR, China
| | - Yi Yang
- Department of Pathology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, PR, China.,Boba Evergrande International Hospital, Qionghai, PR, China
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27
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Abstract
BACKGROUND Formate is a one-carbon molecule at the crossroad between cellular and whole body metabolism, between host and microbiome metabolism, and between nutrition and toxicology. This centrality confers formate with a key role in human physiology and disease that is currently unappreciated. SCOPE OF REVIEW Here we review the scientific literature on formate metabolism, highlighting cellular pathways, whole body metabolism, and interactions with the diet and the gut microbiome. We will discuss the relevance of formate metabolism in the context of embryonic development, cancer, obesity, immunometabolism, and neurodegeneration. MAJOR CONCLUSIONS We will conclude with an outlook of some open questions bringing formate metabolism into the spotlight.
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Affiliation(s)
| | - Johannes Meiser
- Department of Oncology, Luxembourg Institute of Health, L-1526 Luxembourg, Luxembourg
| | - Alexei Vazquez
- Cancer Research UK Beatson Institute, Glasgow, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow, UK.
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28
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Li H, Fu X, Yao F, Tian T, Wang C, Yang A. MTHFD1L-Mediated Redox Homeostasis Promotes Tumor Progression in Tongue Squamous Cell Carcinoma. Front Oncol 2019; 9:1278. [PMID: 31867267 PMCID: PMC6906156 DOI: 10.3389/fonc.2019.01278] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 11/04/2019] [Indexed: 12/15/2022] Open
Abstract
Background: Routine changes in cell metabolism can drive tumor development, as the cellular program develops to promote glycolysis and redox homeostasis during tumor progression; however, the associated mechanisms in tongue squamous cell carcinoma (TSCC) remain unclear. Methods: We investigated methylenetetrahydrofolate dehydrogenase 1-like (MTHFD1L) expression, its clinical relevance, redox modification, and molecular mechanisms using TSCC cells and tissues. The anti-tumor effects of MTHFD1L knockdown on TSCC tumorigenesis were evaluated in vitro and in vivo. Kaplan-Meier curves and the log-rank test were used to analyze disease-free survival and overall survival. Results: TSCC patients with high expression levels of MTHFD1L had shorter overall survival (P < 0.05) and disease-free survival (P < 0.05). Knockdown of MTHFD1L reduced nicotinamide adenine dinucleotide phosphate (NADPH) levels and increased reactive oxygen species (ROS), which accelerated cell death under oxidative stress, such as hypoxia or glucose deprivation. Additionally, inhibition of MTHFD1L suppressed TSCC cell growth and delayed the cell cycle, including in xenograft experiments. Conclusions: MTHFD1L confers redox homeostasis and promotes TSCC cell growth, which provides a great opportunity to study tumor metabolism in head and neck cancer. The mTORC1-4EBP1-eIF4E axis may affect the expression of MTHFD1L in TSCC. Inhibition of the expression of MTHFD1L may be an actionable and effective therapeutic target in TSCC.
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Affiliation(s)
- Hao Li
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Head and Neck Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xiaoyan Fu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Head and Neck Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Fan Yao
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Head and Neck Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Tian Tian
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Chunyang Wang
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Ankui Yang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China.,Department of Head and Neck Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China
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Eich ML, Rodriguez Pena MDC, Chandrashekar DS, Chaux A, Agarwal S, Gordetsky JB, Ferguson JE, Sonpavde GP, Netto GJ, Varambally S. Expression and Role of Methylenetetrahydrofolate Dehydrogenase 1 Like (MTHFD1L) in Bladder Cancer. Transl Oncol 2019; 12:1416-1424. [PMID: 31401334 PMCID: PMC6700437 DOI: 10.1016/j.tranon.2019.07.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 07/12/2019] [Accepted: 07/15/2019] [Indexed: 01/18/2023] Open
Abstract
Cancer cells utilize vitamin folate to fulfill their excessive demand for nucleotides and amino acids. Dihydrofolate reductase (DHFR), an enzyme involved in folate metabolism converts dihydrofolate into tetrahydrofolate, which is required for the de novo synthesis of purines, and certain amino acids. DHFR inhibitors are used as a chemotherapeutic agent. Cancer sequencing analysis has identified additional enzymes in folate metabolism that are dysregulated in cancer. Methylenetetrahydrofolate dehydrogenase 1 like (MTHFD1L), one such enzyme is overexpressed in bladder cancer. MTHFD1L is a mitochondrial enzyme involved in the folate cycle by catalyzing the reaction of formyl-tetrahydrofolate to formate and tetrahydrofolate (THF). THF is crucial for de novo purine and thymidylate synthesis and is also involved in the regeneration of methionine. Cancer cells rely on purines derived from the de novo pathway for the nucleotides whereas normal cells favor the salvage pathway. In this study we examined MTHFD1L expression in bladder cancer. By using publicly available cancer transcriptome data analysis web-portal UALCAN, we found overexpression of MTHFD1L in bladder cancer and expression was associated with overall survival. RT-PCR and immunoblot analysis confirmed the overexpression of MTHFD1L in muscle invasive bladder cancer tissues compared to normal urothelium. Furthermore, our investigations suggested a critical role for MTHFD1L in bladder cancer cell proliferation, colony formation and invasion. Thus, in this study, we show the significance of the folate metabolic enzyme MTHFD1L in aggressive bladder cancers and suggest that being an enzyme, MTHFD1L serves as a valuable therapeutic target.
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Affiliation(s)
- Marie-Lisa Eich
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | | | | | - Alcides Chaux
- Department of Scientific Research, School of Postgraduate Studies, Norte University, Asunción, Paraguay
| | - Sumit Agarwal
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jennifer B Gordetsky
- Department of Pathology and Urology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - James E Ferguson
- Department of Urology, The University of Alabama at Birmingham, Birmingham, AL, US; O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Guru P Sonpavde
- Department of Medicine, Dana-Farber Cancer Institute, Boston, MA, USA
| | - George J Netto
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA; O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Sooryanarayana Varambally
- Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA; O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL, USA.
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Shin M, Vaughn A, Momb J, Appling DR. Deletion of neural tube defect-associated gene Mthfd1l causes reduced cranial mesenchyme density. Birth Defects Res 2019; 111:1520-1534. [PMID: 31518072 DOI: 10.1002/bdr2.1591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/17/2019] [Accepted: 08/26/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND Periconceptional intake of supplemental folic acid can reduce the incidence of neural tube defects by as much as 70%, but the mechanisms by which folic acid supports cellular processes during neural tube closure are unknown. The mitochondrial 10-formyl-tetrahydrofolate synthetase MTHFD1L catalyzes production of formate, thus generating one-carbon units for cytoplasmic processes. Deletion of Mthfd1l causes embryonic lethality, developmental delay, and neural tube defects in mice. METHODS To investigate the role of mitochondrial one-carbon metabolism during cranial neural tube closure, we have analyzed cellular morphology and function in neural tissues in Mthfd1l knockout embryos. RESULTS The head mesenchyme showed significantly lower cellular density in Mthfd1l nullizygous embryos compared to wildtype embryos during the process of neural tube closure. Apoptosis and neural crest cell specification were not affected by deletion of Mthfd1l. Sections from the cranial region of Mthfd1l knockout embryos exhibited decreased cellular proliferation, but only after completion of neural tube closure. Supplementation of pregnant dams with formate improved mesenchymal density and corrected cell proliferation in the nullizygous embryos. CONCLUSIONS Deletion of Mthfd1l causes decreased density in the cranial mesenchyme and this defect is improved with formate supplementation. This study reveals a mechanistic link between folate-dependent mitochondrially produced formate, head mesenchyme formation and neural tube defects.
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Affiliation(s)
- Minhye Shin
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Amanda Vaughn
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Jessica Momb
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
| | - Dean R Appling
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas
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Nilsson R, Nicolaidou V, Koufaris C. Mitochondrial MTHFD isozymes display distinct expression, regulation, and association with cancer. Gene 2019; 716:144032. [PMID: 31377316 DOI: 10.1016/j.gene.2019.144032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 02/06/2023]
Abstract
Mitochondrial folate metabolism is central to the generation of nucleotides, fuelling methylation reactions, and redox homeostasis. Uniquely among the reactions of the mitochondrial folate pathway, the key step of the oxidation of 5,10-methylene-tetrahydrofolate (CH2-THF) can be catalysed by two isozymes, MTHFD2 and MTHFD2L. The MTHFD2 enzyme has recently received considerable attention as an oncogenic enzyme upregulated in several tumour types, which is additionally required by cancer cells in vitro and in vivo. However, much less is currently known about MTHFD2L and its expression in cancer. In this study, we examine and compare the expression and regulation of the two mitochondrial MTHFD isozymes in normal human and cancer cells. We found that normal and cancer cells express both enzymes, although MTHFD2 has a much higher baseline expression. Unlike MTHFD2, the MTHFD2L isozyme does not show an association with proliferation and growth factor stimulation. In addition, we did not find evidence of a compensatory increase of MTHFD2L following suppression of its isozyme. This study supports that MTHFD2L is unlikely to have an important function in increased proliferation or cancer. Furthermore, therapeutic strategies aiming to block the mitochondrial folate pathway in cancer should focus on MTHFD2, with MTHFD2L being unlikely to be involved in the development of chemoresistance to targeting of its mitochondrial isozyme.
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Affiliation(s)
- R Nilsson
- Cardiovascular Medicine Unit, Department of Medicine, Karolinska Institutet, SE-171 76 Stockholm, Sweden; Division of Cardiovascular Medicine, Karolinska University Hospital, SE-171 76 Stockholm, Sweden; Center for Molecular Medicine, Karolinska Institutet, SE-171 76 Stockholm, Sweden
| | - V Nicolaidou
- Department of Life and Health Sciences, University of Nicosia, Nicosia, Cyprus
| | - C Koufaris
- Department of Biological Sciences, University of Cyprus, 2109 Nicosia, Cyprus.
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32
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Fan TWM, Bruntz RC, Yang Y, Song H, Chernyavskaya Y, Deng P, Zhang Y, Shah PP, Beverly LJ, Qi Z, Mahan AL, Higashi RM, Dang CV, Lane AN. De novo synthesis of serine and glycine fuels purine nucleotide biosynthesis in human lung cancer tissues. J Biol Chem 2019; 294:13464-13477. [PMID: 31337706 DOI: 10.1074/jbc.ra119.008743] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 07/06/2019] [Indexed: 11/06/2022] Open
Abstract
Nucleotide synthesis is essential to proliferating cells, but the preferred precursors for de novo biosynthesis are not defined in human cancer tissues. We have employed multiplexed stable isotope-resolved metabolomics to track the metabolism of [13C6]glucose, D2-glycine, [13C2]glycine, and D3-serine into purine nucleotides in freshly resected cancerous and matched noncancerous lung tissues from nonsmall cell lung cancer (NSCLC) patients, and we compared the metabolism with established NSCLC PC9 and A549 cell lines in vitro Surprisingly, [13C6]glucose was the best carbon source for purine synthesis in human NSCLC tissues, in contrast to the noncancerous lung tissues from the same patient, which showed lower mitotic indices and MYC expression. We also observed that D3-Ser was preferentially incorporated into purine rings over D2-glycine in both tissues and cell lines. MYC suppression attenuated [13C6]glucose, D3-serine, and [13C2]glycine incorporation into purines and reduced proliferation in PC9 but not in A549 cells. Using detailed kinetic modeling, we showed that the preferred use of glucose as a carbon source for purine ring synthesis in NSCLC tissues involves cytoplasmic activation/compartmentation of the glucose-to-serine pathway and enhanced reversed one-carbon fluxes that attenuate exogenous serine incorporation into purines. Our findings also indicate that the substrate for de novo nucleotide synthesis differs profoundly between cancer cell lines and fresh human lung cancer tissues; the latter preferred glucose to exogenous serine or glycine but not the former. This distinction in substrate utilization in purine synthesis in human cancer tissues should be considered when targeting one-carbon metabolism for cancer therapy.
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Affiliation(s)
- Teresa W M Fan
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, Kentucky 40536.
| | - Ronald C Bruntz
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536
| | - Ye Yang
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, Kentucky 40536
| | - Huan Song
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536
| | - Yelena Chernyavskaya
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536
| | - Pan Deng
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536
| | - Yan Zhang
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536
| | - Parag P Shah
- J. G. Brown Cancer Center, University of Louisville, Louisville, Kentucky 40202
| | - Levi J Beverly
- J. G. Brown Cancer Center, University of Louisville, Louisville, Kentucky 40202
| | - Zhen Qi
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, Kentucky 40536
| | - Angela L Mahan
- Department of Surgery and Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536
| | - Richard M Higashi
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, Kentucky 40536
| | - Chi V Dang
- Ludwig Institute for Cancer Research, New York, New York 10017; Wistar Institute, Philadelphia, Pennsylvania 19104
| | - Andrew N Lane
- Center for Environmental and Systems Biochemistry (CESB)/Markey Cancer Center, University of Kentucky, Lexington, Kentucky 40536; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, Kentucky 40536.
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Metabolite-based mutualism enhances hydrogen production in a two-species microbial consortium. Commun Biol 2019; 2:82. [PMID: 30854474 PMCID: PMC6395672 DOI: 10.1038/s42003-019-0331-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Accepted: 01/29/2019] [Indexed: 01/07/2023] Open
Abstract
Sustainable hydrogen production from renewable and low-cost substrates is very important to mitigate environmental and energy-related issues. Microbial consortia are promising for diverse bioenergy and environmental applications, yet microbial interactions are not fully understood. Here, we present comprehensive investigation on how two species in an artificial microbial consortium, consisting of Bacillus cereus A1 and Brevundimonas naejangsanensis B1, mutually cooperate to achieve an overall enhancement in hydrogen production and starch utilization. In this consortium, strains A1 and B1 secrete α-amylase and glucoamylase that are functionally complementary in starch hydrolysis. Moreover, strain A1 converts starch into lactate as a carbon source and electron donor, supporting the cell growth and hydrogen generation of strain B1. In return, strain B1 produces formate as an electron shuttle to strain A1 to enhance hydrogen production. The co-culture re-directs the overall metabolic flux, facilitates the cell growth, and up-regulates the key genes of hydrogen production and starch hydrolysis. Wang and Tang et al. show that two-species microbial consortium is more efficient in hydrogen production and starch utilization, compared to pure cultures. This work underscores a utility of synthetic microbial consortia, which can be optimized for increasing production of a certain metabolite.
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34
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Zheng Y, Cantley LC. Toward a better understanding of folate metabolism in health and disease. J Exp Med 2019; 216:253-266. [PMID: 30587505 PMCID: PMC6363433 DOI: 10.1084/jem.20181965] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/18/2018] [Accepted: 12/03/2018] [Indexed: 12/15/2022] Open
Abstract
Folate metabolism is crucial for many biochemical processes, including purine and thymidine monophosphate (dTMP) biosynthesis, mitochondrial protein translation, and methionine regeneration. These biochemical processes in turn support critical cellular functions such as cell proliferation, mitochondrial respiration, and epigenetic regulation. Not surprisingly, abnormal folate metabolism has been causally linked with a myriad of diseases. In this review, we provide a historical perspective, delve into folate chemistry that is often overlooked, and point out various missing links and underdeveloped areas in folate metabolism for future exploration.
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Affiliation(s)
- Yuxiang Zheng
- Department of Medicine, Meyer Cancer Center, Weill Cornell Medicine, New York, NY
| | - Lewis C Cantley
- Department of Medicine, Meyer Cancer Center, Weill Cornell Medicine, New York, NY
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35
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Taflin H, Odin E, Derwinger K, Carlsson G, Gustavsson B, Wettergren Y. Relationship between folate concentration and expression of folate-associated genes in tissue and plasma after intraoperative administration of leucovorin in patients with colorectal cancer. Cancer Chemother Pharmacol 2018; 82:987-997. [PMID: 30269276 PMCID: PMC6267663 DOI: 10.1007/s00280-018-3690-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 09/24/2018] [Indexed: 01/06/2023]
Abstract
Purpose The aim of study was to investigate the relationship between folate concentration and expression of folate-associated genes in tumour, mucosa and plasma of patients with colorectal cancer, after intraoperative administration of bolus leucovorin (LV). Methods Eighty patients were randomized into four groups to receive 0, 60, 200, or 500 mg/m2 LV, respectively. Tissue and plasma folate concentrations were assessed by LC–MS/MS. Gene expression of ABCC3/MRP3, FPGS, GGH, MTHFD1L, SLC46A1/PCFT, and SLC19A1/RFC-1 was determined using quantitative PCR. Results The folate concentration in tumour increased with increasing dosage of LV. Half of the patients treated with 60 mg/m2 did not reach a level above the levels of untreated patients. A significant correlation between folate concentration in tumour and mucosa was found in untreated patients, and in the group treated with 60 mg/m2 LV. The 5-MTHF/LV ratio correlated negatively with folate concentration in mucosa, whereas a positive correlation was found in tumour of patients who received 200 or 500 mg/m2 LV. A positive correlation was found between folate concentration and expression of all genes, except MTHFD1L, in patients who received LV. There was a negative correlation between 5-MTHF concentration in plasma of untreated patients and expression of GGH and SLC46A1/PCFT in tumour. Conclusions The results indicate the possibility of using the individual plasma 5-MTHF/LV ratio after LV injection as a surrogate marker for tissue folate concentration. Expression of several folate-associated genes is associated with folate concentration in tissue and plasma and may become useful when predicting response to LV treatment. Electronic supplementary material The online version of this article (10.1007/s00280-018-3690-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Helena Taflin
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska University Hospital/Östra, Sahlgrenska Academy at University of Gothenburg, 41685, Gothenburg, Sweden.
| | - Elisabeth Odin
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska University Hospital/Östra, Sahlgrenska Academy at University of Gothenburg, 41685, Gothenburg, Sweden
| | - Kristoffer Derwinger
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska University Hospital/Östra, Sahlgrenska Academy at University of Gothenburg, 41685, Gothenburg, Sweden
| | - Göran Carlsson
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska University Hospital/Östra, Sahlgrenska Academy at University of Gothenburg, 41685, Gothenburg, Sweden
| | - Bengt Gustavsson
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska University Hospital/Östra, Sahlgrenska Academy at University of Gothenburg, 41685, Gothenburg, Sweden
| | - Yvonne Wettergren
- Department of Surgery, Institute of Clinical Sciences, Sahlgrenska University Hospital/Östra, Sahlgrenska Academy at University of Gothenburg, 41685, Gothenburg, Sweden
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36
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Koufaris C, Nilsson R. Protein interaction and functional data indicate MTHFD2 involvement in RNA processing and translation. Cancer Metab 2018; 6:12. [PMID: 30275950 PMCID: PMC6158883 DOI: 10.1186/s40170-018-0185-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 08/08/2018] [Indexed: 01/09/2023] Open
Abstract
Background The folate-coupled metabolic enzyme MTHFD2 is overexpressed in many tumor types and required for cancer cell proliferation, and is therefore of interest as a potential cancer therapeutic target. However, recent evidence suggests that MTHFD2 has a non-enzymatic function which may underlie the dependence of cancer cells on this protein. Understanding this non-enzymatic function is important for optimal targeting of MTHFD2 in cancer. Methods To identify potential non-enzymatic functions of MTHFD2, we defined its interacting proteins using co-immunoprecipitation and mass spectrometry and integrated this information with large-scale co-expression analysis, protein dynamics, and gene expression response to MTHFD2 knockdown. Results We found that MTHFD2 physically interacts with a set of nuclear proteins involved in RNA metabolism and translation, including components of the small ribosomal subunit and multiple members of the RNA-processing hnRNP family. Interacting proteins were also in general co-expressed with MTHFD2 in experiments that stimulate or repress proliferation, suggesting a close functional relationship. Also, unlike other folate one-carbon enzymes, the MTHFD2 protein has a short half-life and responds rapidly to serum. Finally, shRNA against MTHFD2 depletes several of its interactors and yields an overall transcriptional response similar to targeted inhibition of certain ribosomal subunits. Conclusions Taken together, our findings suggest a novel function of MTHFD2 in RNA metabolism and translation. Electronic supplementary material The online version of this article (10.1186/s40170-018-0185-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Costas Koufaris
- 1Cardiovascular Medicine Unit, Department of Medicine, Karolinska Institutet, SE-171 76 Stockholm, Sweden.,2Division of Cardiovascular Medicine, Karolinska University Hospital, SE-171 76 Stockholm, Sweden.,3Center for Molecular Medicine, Karolinska Institutet, SE-171 76 Stockholm, Sweden
| | - Roland Nilsson
- 1Cardiovascular Medicine Unit, Department of Medicine, Karolinska Institutet, SE-171 76 Stockholm, Sweden.,2Division of Cardiovascular Medicine, Karolinska University Hospital, SE-171 76 Stockholm, Sweden.,3Center for Molecular Medicine, Karolinska Institutet, SE-171 76 Stockholm, Sweden
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Bazer FW, Burghardt RC, Johnson GA, Spencer TE, Wu G. Mechanisms for the establishment and maintenance of pregnancy: synergies from scientific collaborations. Biol Reprod 2018; 99:225-241. [PMID: 29462279 PMCID: PMC6044348 DOI: 10.1093/biolre/ioy047] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Revised: 02/13/2018] [Accepted: 02/15/2018] [Indexed: 11/14/2022] Open
Abstract
Research on the functions of interferon tau (IFNT) led to the theory of pregnancy recognition signaling in ruminant species. But IFNT does much more as it induces expression of interferon regulatory factor 2 (IRF2) in uterine luminal (LE), superficial glandular (sGE), but not glandular (GE) epithelia. First, IRF2 silences transcription of the estrogen receptor alpha gene and, indirectly, transcription of the oxytocin receptor gene to abrogate development of the luteolytic mechanism to prevent regression of the corpus luteum and its production of progesterone for establishing and maintaining pregnancy. Second, IRF2 silences expression of classical interferon-stimulated genes in uterine LE and sGE; however, uterine LE and sGE respond to progesterone (P4) and IFNT to increase expression of genes for transport of nutrients into the uterine lumen such as amino acids and glucose. Other genes expressed by uterine LE and sGE encode for adhesion molecules such as galectin 15, cathepsins, and cystatins for tissue remodeling, and hypoxia-inducible factor relevant to angiogenesis and survival of blastocysts in a hypoxic environment. IFNT is also key to a servomechanism that allows uterine epithelia, particularly GE, to proliferate and to express genes in response to placental lactogen and placental growth hormone in sheep. The roles of secreted phosphoprotein 1 are also discussed regarding its role in implantation in sheep and pigs, as well as its stimulation of expression of mechanistic target of rapamycin mRNA and protein which is central to proliferation, migration, and gene expression in the trophectoderm cells.
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Affiliation(s)
- Fuller W Bazer
- Department of Animal Science, Texas A&M University, College Station, Texas, USA
| | - Robert C Burghardt
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas, USA
| | - Gregory A Johnson
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas, USA
| | - Thomas E Spencer
- Division of Animal Science, University of Missouri, Columbia, Missouri, USA
| | - Guoyao Wu
- Department of Animal Science, Texas A&M University, College Station, Texas, USA
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Kim J, Lei Y, Guo J, Kim SE, Wlodarczyk BJ, Cabrera RM, Lin YL, Nilsson TK, Zhang T, Ren A, Wang L, Yuan Z, Zheng YF, Wang HY, Finnell RH. Formate rescues neural tube defects caused by mutations in Slc25a32. Proc Natl Acad Sci U S A 2018; 115:4690-4695. [PMID: 29666258 PMCID: PMC5939102 DOI: 10.1073/pnas.1800138115] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Periconceptional folic acid (FA) supplementation significantly reduces the prevalence of neural tube defects (NTDs). Unfortunately, some NTDs are FA resistant, and as such, NTDs remain a global public health concern. Previous studies have identified SLC25A32 as a mitochondrial folate transporter (MFT), which is capable of transferring tetrahydrofolate (THF) from cellular cytoplasm to the mitochondria in vitro. Herein, we show that gene trap inactivation of Slc25a32 (Mft) in mice induces NTDs that are folate (5-methyltetrahydrofolate, 5-mTHF) resistant yet are preventable by formate supplementation. Slc25a32gt/gt embryos die in utero with 100% penetrant cranial NTDs. 5-mTHF supplementation failed to promote normal neural tube closure (NTC) in mutant embryos, while formate supplementation enabled the majority (78%) of knockout embryos to complete NTC. A parallel genetic study in human subjects with NTDs identified biallelic loss of function SLC25A32 variants in a cranial NTD case. These data demonstrate that the loss of functional Slc25a32 results in cranial NTDs in mice and has also been observed in a human NTD patient.
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Affiliation(s)
- Jimi Kim
- Department of Nutritional Sciences, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin, Austin, TX 78723
| | - Yunping Lei
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin , Austin, TX 78723
| | - Jin Guo
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, 100700 Beijing, China
| | - Sung-Eun Kim
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin , Austin, TX 78723
| | - Bogdan J Wlodarczyk
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin , Austin, TX 78723
| | - Robert M Cabrera
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin , Austin, TX 78723
| | - Ying Linda Lin
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin , Austin, TX 78723
| | - Torbjorn K Nilsson
- Department of Medical Biosciences, Clinical Chemistry, Umea University, SE-90185 Umea, Sweden
| | - Ting Zhang
- Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, 100700 Beijing, China
| | - Aiguo Ren
- Institute of Reproductive and Child Health, Peking University, 100191 Beijing, China
| | - Linlin Wang
- Institute of Reproductive and Child Health, Peking University, 100191 Beijing, China
| | - Zhengwei Yuan
- Key Laboratory of Health Ministry for Congenital Malformation, Shengjing Hospital, China Medical University, 117004 Shenyang, China
| | - Yu-Fang Zheng
- Obstetrics & Gynecology Hospital, State Key Laboratory of Genetic Engineering and School of Life Sciences of Fudan University, 20043 Shanghai, China
- Key Laboratory of Reproduction Regulation of National Population and Family Planning Commission, Institute of Reproduction & Development and Children's Hospital of Fudan University, 200011 Shanghai, China
| | - Hong-Yan Wang
- Obstetrics & Gynecology Hospital, State Key Laboratory of Genetic Engineering and School of Life Sciences of Fudan University, 20043 Shanghai, China;
- Key Laboratory of Reproduction Regulation of National Population and Family Planning Commission, Institute of Reproduction & Development and Children's Hospital of Fudan University, 200011 Shanghai, China
| | - Richard H Finnell
- Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin , Austin, TX 78723;
- Collaborative Innovation Center for Genetics & Development, School of Life Sciences, Fudan University, 200438 Shanghai, China
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MacMillan L, Tingley G, Young SK, Clow KA, Randell EW, Brosnan ME, Brosnan JT. Cobalamin Deficiency Results in Increased Production of Formate Secondary to Decreased Mitochondrial Oxidation of One-Carbon Units in Rats. J Nutr 2018; 148:358-363. [PMID: 29546303 DOI: 10.1093/jn/nxx057] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/27/2017] [Indexed: 11/13/2022] Open
Abstract
Background Formate is produced in mitochondria via the catabolism of serine, glycine, dimethylglycine, and sarcosine. Formate produced by mitochondria may be incorporated into the cytosolic folate pool where it can be used for important biosynthetic reactions. Previous studies from our lab have shown that cobalamin deficiency results in increased plasma formate concentrations. Objective Our goal was to determine the basis for elevated formate in vitamin B-12 deficiency. Methods Male Sprague Dawley rats were randomly assigned to consume either a cobalamin-replete (50 μg cobalamin/kg diet) or -deficient (no added cobalamin) diet for 6 wk. Formate production was measured in vivo and in isolated liver mitochondria from a variety of one-carbon precursors. We also measured the oxidation of [3-14C]-l-serine to 14CO2 in isolated rat liver mitochondria and the expression of hepatic genes involved in one-carbon unit and formate metabolism. Results Cobalamin-deficient rats produce formate at a rate 55% higher than that of replete rats. Formate production from serine was increased by 60% and from dimethylglycine and sarcosine by ∼200% in liver mitochondria isolated from cobalamin-deficient rats compared with cobalamin-replete rats. There was a 26% decrease in the 14CO2 produced by mitochondria from cobalamin-deficient rats. Gene expression analysis showed that 10-formyltetrahydrofolate dehydrogenase-cytosolic (Aldh1l1) and mitochondrial (Aldh1l2) expression were decreased by 40% and 60%, respectively, compared to control, while 10-formyltetrahydrofolate synthetase, mitochondrial, monofunctional (Mthfd1l) expression was unchanged. Conclusion We propose that a bifurcation in mitochondrial one-carbon metabolism is a key control mechanism in determining the fate of one-carbon units, to formate or CO2. During cobalamin deficiency in rats the disposition of 10-formyl-tetrahydrofolate carbon is shifted in favor of formate production. This may represent a mechanism to generate more one-carbon units for the replenishment of the S-adenosylmethionine pool which is depleted in this condition.
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Affiliation(s)
| | | | | | | | - Edward W Randell
- Laboratory Medicine, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
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Bryant JD, Sweeney SR, Sentandreu E, Shin M, Ipas H, Xhemalce B, Momb J, Tiziani S, Appling DR. Deletion of the neural tube defect-associated gene Mthfd1l disrupts one-carbon and central energy metabolism in mouse embryos. J Biol Chem 2018; 293:5821-5833. [PMID: 29483189 DOI: 10.1074/jbc.ra118.002180] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 02/23/2018] [Indexed: 11/06/2022] Open
Abstract
One-carbon (1C) metabolism is a universal folate-dependent pathway essential for de novo purine and thymidylate synthesis, amino acid interconversion, universal methyl-donor production, and regeneration of redox cofactors. Homozygous deletion of the 1C pathway gene Mthfd1l encoding methylenetetrahydrofolate dehydrogenase (NADP+-dependent) 1-like, which catalyzes mitochondrial formate production from 10-formyltetrahydrofolate, results in 100% penetrant embryonic neural tube defects (NTDs), underscoring the central role of mitochondrially derived formate in embryonic development and providing a mechanistic link between folate and NTDs. However, the specific metabolic processes that are perturbed by Mthfd1l deletion are not known. Here, we performed untargeted metabolomics on whole Mthfd1l-null and wildtype mouse embryos in combination with isotope tracer analysis in mouse embryonic fibroblast (MEF) cell lines to identify Mthfd1l deletion-induced disruptions in 1C metabolism, glycolysis, and the TCA cycle. We found that maternal formate supplementation largely corrects these disruptions in Mthfd1l-null embryos. Serine tracer experiments revealed that Mthfd1l-null MEFs have altered methionine synthesis, indicating that Mthfd1l deletion impairs the methyl cycle. Supplementation of Mthfd1l-null MEFs with formate, hypoxanthine, or combined hypoxanthine and thymidine restored their growth to wildtype levels. Thymidine addition alone was ineffective, suggesting a purine synthesis defect in Mthfd1l-null MEFs. Tracer experiments also revealed lower proportions of labeled hypoxanthine and inosine monophosphate in Mthfd1l-null than in wildtype MEFs, suggesting that Mthfd1l deletion results in increased reliance on the purine salvage pathway. These results indicate that disruptions of mitochondrial 1C metabolism have wide-ranging consequences for many metabolic processes, including those that may not directly interact with 1C metabolism.
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Affiliation(s)
| | - Shannon R Sweeney
- Nutritional Sciences and the Dell Pediatric Research Institute, The University of Texas at Austin, Austin, Texas 78712
| | - Enrique Sentandreu
- Nutritional Sciences and the Dell Pediatric Research Institute, The University of Texas at Austin, Austin, Texas 78712
| | - Minhye Shin
- From the Departments of Molecular Biosciences and
| | - Hélène Ipas
- From the Departments of Molecular Biosciences and
| | | | - Jessica Momb
- From the Departments of Molecular Biosciences and
| | - Stefano Tiziani
- Nutritional Sciences and the Dell Pediatric Research Institute, The University of Texas at Austin, Austin, Texas 78712
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Offspring sex impacts DNA methylation and gene expression in placentae from women with diabetes during pregnancy. PLoS One 2018; 13:e0190698. [PMID: 29470513 PMCID: PMC5823368 DOI: 10.1371/journal.pone.0190698] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 12/19/2017] [Indexed: 12/21/2022] Open
Abstract
Aims/Hypothesis We hypothesized that diabetes during pregnancy (DDP) alters genome-wide DNA methylation in placenta resulting in differentially methylated loci of metabolically relevant genes and downstream changes in RNA and protein expression. Methods We mapped genome-wide DNA methylation with the Infinium 450K Human Methylation Bead Chip in term fetal placentae from Native American and Hispanic women with DDP using a nested case-control design (n = 17 pairs). RNA expression and protein levels were assayed via RNA-Seq and Western Blot. Results Genome-wide DNA methylation analysis revealed 465 CpG sites with significant changes for male offspring, 247 for female offspring, and 277 for offspring of both sexes (p<0.001). Placentae from female offspring were 40% more likely to have significant gains in DNA methylation compared with placentae from male offspring exposed to DDP (p<0.001). Changes in DNA methylation corresponded to changes in RNA and protein levels for 6 genes: PIWIL3, CYBA, GSTM1, GSTM5, KCNE1 and NXN. Differential DNA methylation was detected at loci related to mitochondrial function, DNA repair, inflammation, oxidative stress. Conclusions/Interpretation These findings begin to explain mechanisms responsible for the increased risk for obesity and type 2 diabetes in offspring of mothers with DDP.
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Petschner P, Gonda X, Baksa D, Eszlari N, Trivaks M, Juhasz G, Bagdy G. Genes Linking Mitochondrial Function, Cognitive Impairment and Depression are Associated with Endophenotypes Serving Precision Medicine. Neuroscience 2018; 370:207-217. [DOI: 10.1016/j.neuroscience.2017.09.049] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 08/01/2017] [Accepted: 09/25/2017] [Indexed: 12/15/2022]
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Nrf2-Mediated Metabolic Reprogramming in Cancer. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:9304091. [PMID: 29670683 PMCID: PMC5833252 DOI: 10.1155/2018/9304091] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 12/16/2017] [Accepted: 12/31/2017] [Indexed: 02/07/2023]
Abstract
Metabolic reprogramming is one of the hallmarks of cancer. Nrf2 pathway is one of the critical signaling cascades involved in cell defense and survival against oxidative stress. The significance of Nrf2 in cancer metabolism begins to be recognized. In this minireview, we focus on the Nrf2-mediated cancer metabolic reprogramming and intend to highlight the role of Nrf2 in the regulation of malignant transformation, cancer proliferation, and the development of treatment resistance via metabolic adaptations. We hope for the development of noninvasive biomarkers and novel therapeutic approaches for cancer based on Nrf2-directed cancer metabolic reprogramming in the near future.
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Shin M, Momb J, Appling DR. Human mitochondrial MTHFD2 is a dual redox cofactor-specific methylenetetrahydrofolate dehydrogenase/methenyltetrahydrofolate cyclohydrolase. Cancer Metab 2017; 5:11. [PMID: 29225823 PMCID: PMC5718140 DOI: 10.1186/s40170-017-0173-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 11/05/2017] [Indexed: 01/13/2023] Open
Abstract
Background Folate-dependent one-carbon metabolism provides one-carbon units for several biological processes. This pathway is highly compartmentalized in eukaryotes, with the mitochondrial pathway producing formate for use in cytoplasmic processes. The mitochondrial enzyme MTHFD2 has been reported to use NAD+ as a cofactor while the isozyme MTHFD2L utilizes NAD+ or NADP+ at physiologically relevant conditions. Because MTHFD2 is highly expressed in many cancer types, we sought to determine the cofactor preference of this enzyme. Results Kinetic analysis shows that purified human MTHFD2 exhibits dual redox cofactor specificity, utilizing either NADP+ or NAD+ with the more physiologically relevant pentaglutamate folate substrate. Conclusion These results show that the mitochondrial folate pathway isozymes MTHFD2 and MTHFD2L both exhibit dual redox cofactor specificity. Our kinetic analysis clearly supports a role for MTHFD2 in mitochondrial NADPH production, indicating that this enzyme is likely responsible for mitochondrial production of both NADH and NADPH in rapidly proliferating cells.
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Affiliation(s)
- Minhye Shin
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712-0165 USA
| | - Jessica Momb
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712-0165 USA
| | - Dean R Appling
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX 78712-0165 USA
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Xu L, Wang R, Ziegelbauer J, Wu WW, Shen RF, Juhl H, Zhang Y, Pelosof L, Rosenberg AS. Transcriptome analysis of human colorectal cancer biopsies reveals extensive expression correlations among genes related to cell proliferation, lipid metabolism, immune response and collagen catabolism. Oncotarget 2017; 8:74703-74719. [PMID: 29088818 PMCID: PMC5650373 DOI: 10.18632/oncotarget.20345] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/12/2017] [Indexed: 12/12/2022] Open
Abstract
Precise characterization of biological processes critical to proliferation and metastasis of colorectal cancer should facilitate the development of diagnostic and prognostic biomarkers as well as novel treatments. Using mRNA-Seq, we examined the protein coding messenger RNA (mRNA) expression profiles across different histologically defined stages of primary colon cancers and compared them to their patient matched normal tissue controls. In comparing 79 colorectal cancers to their matched normal mucosa, tumors were distinguished from normal non-malignant tissues not only in the upregulation of biological processes pertaining to cell proliferation, inflammation, and tissue remodeling, but even more strikingly, in downregulated biological processes including fatty acid beta oxidization for ATP production and epithelial cell differentiation and function. A network analysis of deregulated genes revealed newly described cancer networks and putative hub genes. Taken together, our findings suggest that, within an inflammatory microenvironment, invasive, dedifferentiated and rapidly dividing tumor cells divert the oxidation of fatty acids and lipids from energy production into lipid components of cell membranes and organelles to support tumor proliferation. A gene co-expression network analysis provides a clear and broad picture of biological pathways in tumors that may significantly enhance or supplant current histopathologic studies.
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Affiliation(s)
- Lai Xu
- Office of Biotechnology Products, CDER, FDA, Silver Spring, MD 20993, USA
| | - Rong Wang
- Office of Biotechnology Products, CDER, FDA, Silver Spring, MD 20993, USA
| | | | - Wells W Wu
- Facility for Biotechnology Resources, CBER, FDA, Silver Spring, MD 20993, USA
| | - Rong-Fong Shen
- Facility for Biotechnology Resources, CBER, FDA, Silver Spring, MD 20993, USA
| | | | - Yaqin Zhang
- Office of Biotechnology Products, CDER, FDA, Silver Spring, MD 20993, USA
| | - Lorraine Pelosof
- Office of Hematology and Oncology Products, CDER, FDA, Silver Spring, MD 20993, USA
| | - Amy S Rosenberg
- Office of Biotechnology Products, CDER, FDA, Silver Spring, MD 20993, USA
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Abstract
Formate, the only non-tetrahydrofolate (THF)-linked intermediate in one-carbon metabolism, is produced in mammals from a variety of metabolic sources. It occurs in serum of adults at a concentration of approximately 30 μM. Its principal function lies as a source of one-carbon groups for the synthesis of 10-formyl-THF and other one-carbon intermediates; these are primarily used for purine synthesis, thymidylate synthesis, and the provision of methyl groups for synthetic, regulatory, and epigenetic methylation reactions. Although formate is largely produced in mitochondria, these functions mostly occur in the cytoplasm and nucleus. Formate plays a significant role in embryonic development, as evidenced by the effectiveness of formate in the pregnant dam's drinking water on the incidence of neural tube defects in some genetic models. High formate concentrations in fetal lambs may indicate a role in fetal development and suggest that extracellular formate may play a role in the interorgan distribution of one-carbon groups.
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Affiliation(s)
- Margaret E Brosnan
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X9, Canada;
| | - John T Brosnan
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X9, Canada;
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47
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Abstract
Neural tube defects (NTDs) are the most severe congenital malformations of the central nervous system. The etiology is complex, with both genetic and environmental factors having important contributions. Researchers have known for the past two decades that maternal periconceptional use of the B vitamin folic acid can prevent many NTDs. Though this finding is arguably one of the most important recent discoveries in birth defect research, the mechanism by which folic acid exerts this benefit remains unknown. Research to date has focused on the hypothesis that an underlying genetic susceptibility interacts with folate-sensitive metabolic processes at the time of neural tube closure. Little progress has been made searching for risk-causative variants in candidate genes; therefore, more complex genetic and epigenetic methodologies are now being considered. This article reviews the research to date that has been targeted on this important gene-nutrient locus.
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Affiliation(s)
- Anne M Molloy
- School of Medicine and School of Biochemistry and Immunology, Trinity College Dublin, The University of Dublin, 2 Ireland;
| | - Faith Pangilinan
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland 20892; ,
| | - Lawrence C Brody
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, Bethesda, Maryland 20892; ,
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48
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Lee D, Xu IMJ, Chiu DKC, Lai RKH, Tse APW, Lan Li L, Law CT, Tsang FHC, Wei LL, Chan CYK, Wong CM, Ng IOL, Wong CCL. Folate cycle enzyme MTHFD1L confers metabolic advantages in hepatocellular carcinoma. J Clin Invest 2017; 127:1856-1872. [PMID: 28394261 PMCID: PMC5409797 DOI: 10.1172/jci90253] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 02/16/2017] [Indexed: 01/02/2023] Open
Abstract
Cancer cells preferentially utilize glucose and glutamine, which provide macromolecules and antioxidants that sustain rapid cell division. Metabolic reprogramming in cancer drives an increased glycolytic rate that supports maximal production of these nutrients. The folate cycle, through transfer of a carbon unit between tetrahydrofolate and its derivatives in the cytoplasmic and mitochondrial compartments, produces other metabolites that are essential for cell growth, including nucleotides, methionine, and the antioxidant NADPH. Here, using hepatocellular carcinoma (HCC) as a cancer model, we have observed a reduction in growth rate upon withdrawal of folate. We found that an enzyme in the folate cycle, methylenetetrahydrofolate dehydrogenase 1-like (MTHFD1L), plays an essential role in support of cancer growth. We determined that MTHFD1L is transcriptionally activated by NRF2, a master regulator of redox homeostasis. Our observations further suggest that MTHFD1L contributes to the production and accumulation of NADPH to levels that are sufficient to combat oxidative stress in cancer cells. The elevation of oxidative stress through MTHFD1L knockdown or the use of methotrexate, an antifolate drug, sensitizes cancer cells to sorafenib, a targeted therapy for HCC. Taken together, our study identifies MTHFD1L in the folate cycle as an important metabolic pathway in cancer cells with the potential for therapeutic targeting.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Chun-Ming Wong
- Department of Pathology and
- State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Irene Oi-Lin Ng
- Department of Pathology and
- State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Carmen Chak-Lui Wong
- Department of Pathology and
- State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
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Abstract
Nonalcoholic fatty liver disease (NAFLD) is a spectrum of chronic liver conditions that are characterized by steatosis, inflammation, fibrosis, and liver injury. The global prevalence of NAFLD is rapidly increasing in proportion to the rising incidence of obesity and type 2 diabetes. Because NAFLD is a multifaceted disorder with many underlying metabolic abnormalities, currently, there is no pharmacological agent that is therapeutically approved for the treatment of this disease. Folate is a water-soluble B vitamin that plays an essential role in one-carbon transfer reactions involved in nucleic acid biosynthesis, methylation reactions, and sulfur-containing amino acid metabolism. The liver is the primary organ responsible for storage and metabolism of folates. Low serum folate levels have been observed in patients with obesity and diabetes. It has been reported that a low level of endogenous folates in rodents perturbs folate-dependent one-carbon metabolism, and may be associated with development of metabolic diseases such as NAFLD. This review highlights the biological role of folate in the progression of NAFLD and its associated metabolic complications including obesity and type 2 diabetes. Understanding the role of folate in metabolic disease may position this vitamin as a potential therapeutic for NAFLD.
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Affiliation(s)
- Victoria Sid
- a St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB R2H 2A6, Canada.,b Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, MB R3E 0J9, Canada
| | - Yaw L Siow
- a St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB R2H 2A6, Canada.,b Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, MB R3E 0J9, Canada.,c Agriculture and Agri-Food Canada, Winnipeg, MB R3C 1B2, Canada
| | - Karmin O
- a St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB R2H 2A6, Canada.,b Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, MB R3E 0J9, Canada.,d Department of Animal Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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50
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MacMillan L, Lamarre SG, daSilva RP, Jacobs RL, Brosnan ME, Brosnan JT. Riboflavin Deficiency in Rats Decreases de novo Formate Production but Does Not Affect Plasma Formate Concentration. J Nutr 2017; 147:346-352. [PMID: 28122934 DOI: 10.3945/jn.116.243535] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 11/29/2016] [Accepted: 12/27/2016] [Indexed: 11/14/2022] Open
Abstract
Background: The one-carbon metabolism pathway is highly dependent on a number of B vitamins in order to provide one-carbon units for purine and thymidylate biosynthesis as well as homocysteine remethylation. Previous studies have examined folate and vitamin B-12 deficiency and their effects on formate metabolism; as of yet, to our knowledge, no studies on the effects of riboflavin deficiency on formate metabolism have been published.Objective: Our objective was to determine the effects of riboflavin deficiency on formate metabolism.Methods: Weanling male rats were randomly assigned either to control, riboflavin-replete (RR) or to experimental, riboflavin-deficient (RD) versions of the AIN-93G diet for 13 d, at which time a constant infusion of [13C]-formate was carried out to ascertain the effects of deficiency on formate production. Gas chromatography-mass spectrometry was used to measure plasma formate concentration and [13C]-formate enrichment. HPLC, LC-mass spectrometry (MS)/MS, and enzymatic assays were used for the measurement of one-carbon precursors and other metabolites.Results: RD rats had significantly lower rates of formate production (15%) as well as significantly reduced hepatic methylenetetrahydrofolate reductase activity (69%) and protein concentration (54%) compared with RR rats. There was no difference in plasma formate concentrations between the groups. Plasma serine, a potential one-carbon precursor, was significantly higher in RD rats (467 ± 73 μM) than in RR rats (368 ± 52 μM).Conclusions: Although deficiencies in folate and vitamin B-12 lead to major changes in plasma formate concentrations, riboflavin deficiency results in no significant difference; this disagrees with the prediction of a published mathematical model. Our observation of a lower rate of formate production is consistent with a role for flavoproteins in this process.
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Affiliation(s)
- Luke MacMillan
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada
| | - Simon G Lamarre
- Department of Biology, University of Moncton, Moncton, New Brunswick, Canada; and
| | - Robin P daSilva
- Department of Agricultural, Food and Nutritional Sciences, Alberta Diabetes Institute, University of Alberta, Edmonton, Alberta, Canada
| | - René L Jacobs
- Department of Agricultural, Food and Nutritional Sciences, Alberta Diabetes Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Margaret E Brosnan
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada
| | - John T Brosnan
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada;
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