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Energy Metabolism in Cancer: The Roles of STAT3 and STAT5 in the Regulation of Metabolism-Related Genes. Cancers (Basel) 2020; 12:cancers12010124. [PMID: 31947710 PMCID: PMC7016889 DOI: 10.3390/cancers12010124] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/03/2019] [Accepted: 12/12/2019] [Indexed: 12/21/2022] Open
Abstract
A central characteristic of many types of cancer is altered energy metabolism processes such as enhanced glucose uptake and glycolysis and decreased oxidative metabolism. The regulation of energy metabolism is an elaborate process involving regulatory proteins such as HIF (pro-metastatic protein), which reduces oxidative metabolism, and some other proteins such as tumour suppressors that promote oxidative phosphorylation. In recent years, it has been demonstrated that signal transducer and activator of transcription (STAT) proteins play a pivotal role in metabolism regulation. STAT3 and STAT5 are essential regulators of cytokine- or growth factor-induced cell survival and proliferation, as well as the crosstalk between STAT signalling and oxidative metabolism. Several reports suggest that the constitutive activation of STAT proteins promotes glycolysis through the transcriptional activation of hypoxia-inducible factors and therefore, the alteration of mitochondrial activity. It seems that STAT proteins function as an integrative centre for different growth and survival signals for energy and respiratory metabolism. This review summarises the functions of STAT3 and STAT5 in the regulation of some metabolism-related genes and the importance of oxygen in the tumour microenvironment to regulate cell metabolism, particularly in the metabolic pathways that are involved in energy production in cancer cells.
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2
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Huang L, Wang C, Xu H, Peng G. Targeting citrate as a novel therapeutic strategy in cancer treatment. Biochim Biophys Acta Rev Cancer 2019; 1873:188332. [PMID: 31751601 DOI: 10.1016/j.bbcan.2019.188332] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/14/2019] [Accepted: 11/15/2019] [Indexed: 01/09/2023]
Abstract
An important feature shared by many cancer cells is drastically altered metabolism that is critical for rapid growth and proliferation. The distinctly reprogrammed metabolism in cancer cells makes it possible to manipulate the levels of metabolites for cancer treatment. Citrate is a key metabolite that bridges many important metabolic pathways. Recent studies indicate that manipulating the level of citrate can impact the behaviors of both cancer and immune cells, resulting in induction of cancer cell apoptosis, boosting immune responses, and enhanced cancer immunotherapy. In this review, we discuss the recent developments in this emerging area of targeting citrate in cancer treatment. Specifically, we summarize the molecular basis of altered citrate metabolism in both tumors and immune cells, explore the seemingly conflicted growth promoting and growth inhibiting roles of citrate in various tumors, discuss the use of citrate in the clinic as a novel biomarker for cancer progression and outcomes, and highlight the new development of combining citrate with other therapeutic strategies in cancer therapy. An improved understanding of complex roles of citrate in the suppressive tumor microenvironment should open new avenues for cancer therapy.
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Affiliation(s)
- Lan Huang
- Division of Infectious Diseases, Allergy & Immunology, Department of Internal Medicine, Saint Louis University School of Medicine, Saint Louis, MO 63104, USA; Department of Immunology, Jiangsu University School of Medicine, Zhenjiang 212013, PR China
| | - Cindy Wang
- Division of Infectious Diseases, Allergy & Immunology, Department of Internal Medicine, Saint Louis University School of Medicine, Saint Louis, MO 63104, USA
| | - Huaxi Xu
- Department of Immunology, Jiangsu University School of Medicine, Zhenjiang 212013, PR China
| | - Guangyong Peng
- Division of Infectious Diseases, Allergy & Immunology, Department of Internal Medicine, Saint Louis University School of Medicine, Saint Louis, MO 63104, USA.
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3
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Vela D. Iron Metabolism in Prostate Cancer; From Basic Science to New Therapeutic Strategies. Front Oncol 2018; 8:547. [PMID: 30538952 PMCID: PMC6277552 DOI: 10.3389/fonc.2018.00547] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 11/05/2018] [Indexed: 01/09/2023] Open
Abstract
An increasing amount of research has recently strengthened the case for the existence of iron dysmetabolism in prostate cancer. It is characterized with a wide array of differential expression of iron-related proteins compared to normal cells. These proteins control iron entry, cellular iron distribution but also iron exit from prostate cells. Iron dysmetabolism is not an exclusive feature of prostate cancer cells, but it is observed in other cells of the tumor microenvironment. Disrupting the machinery that secures iron for prostate cancer cells can retard tumor growth and its invasive potential. This review unveils the current understanding of the ways that prostate cancer cells secure iron in the tumor milieu and how can we exploit this knowledge for therapeutic purposes.
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Affiliation(s)
- Driton Vela
- Department of Physiology, University of Prishtina, Prishtina, Kosovo
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4
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Latonen L, Afyounian E, Jylhä A, Nättinen J, Aapola U, Annala M, Kivinummi KK, Tammela TTL, Beuerman RW, Uusitalo H, Nykter M, Visakorpi T. Integrative proteomics in prostate cancer uncovers robustness against genomic and transcriptomic aberrations during disease progression. Nat Commun 2018; 9:1176. [PMID: 29563510 PMCID: PMC5862881 DOI: 10.1038/s41467-018-03573-6] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 02/21/2018] [Indexed: 01/23/2023] Open
Abstract
To understand functional consequences of genetic and transcriptional aberrations in prostate cancer, the proteomic changes during disease formation and progression need to be revealed. Here we report high-throughput mass spectrometry on clinical tissue samples of benign prostatic hyperplasia (BPH), untreated primary prostate cancer (PC) and castration resistant prostate cancer (CRPC). Each sample group shows a distinct protein profile. By integrative analysis we show that, especially in CRPC, gene copy number, DNA methylation, and RNA expression levels do not reliably predict proteomic changes. Instead, we uncover previously unrecognized molecular and pathway events, for example, several miRNA target correlations present at protein but not at mRNA level. Notably, we identify two metabolic shifts in the citric acid cycle (TCA cycle) during prostate cancer development and progression. Our proteogenomic analysis uncovers robustness against genomic and transcriptomic aberrations during prostate cancer progression, and significantly extends understanding of prostate cancer disease mechanisms. Understanding of molecular events in cancer requires proteome-level characterisation. Here, proteome profiling of patient samples representing primary and progressed prostate cancer enables the authors to identify pathway alterations that are not reflected at the genomic and transcriptomic levels.
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Affiliation(s)
- Leena Latonen
- Prostate Cancer Research Center, Faculty of Medicine and Life Sciences and BioMediTech Institute, University of Tampere, Tampere, 33014, Finland.,FimLab Laboratories, Tampere University Hospital, Tampere, 33101, Finland
| | - Ebrahim Afyounian
- Prostate Cancer Research Center, Faculty of Medicine and Life Sciences and BioMediTech Institute, University of Tampere, Tampere, 33014, Finland
| | - Antti Jylhä
- Department of Ophthalmology, Faculty of Medicine and Life Sciences, University of Tampere, Tampere, 33014, Finland
| | - Janika Nättinen
- Department of Ophthalmology, Faculty of Medicine and Life Sciences, University of Tampere, Tampere, 33014, Finland
| | - Ulla Aapola
- Department of Ophthalmology, Faculty of Medicine and Life Sciences, University of Tampere, Tampere, 33014, Finland
| | - Matti Annala
- Prostate Cancer Research Center, Faculty of Medicine and Life Sciences and BioMediTech Institute, University of Tampere, Tampere, 33014, Finland
| | - Kati K Kivinummi
- Prostate Cancer Research Center, Faculty of Medicine and Life Sciences and BioMediTech Institute, University of Tampere, Tampere, 33014, Finland
| | - Teuvo T L Tammela
- Department of Urology, University of Tampere and Tampere University Hospital, Tampere, 33521, Finland
| | - Roger W Beuerman
- Department of Ophthalmology, Faculty of Medicine and Life Sciences, University of Tampere, Tampere, 33014, Finland.,Singapore Eye Research Institute, Singapore, 169856, Singapore.,Duke-NUS Neuroscience, Singapore, 169857, Singapore.,Duke-NUS Medical School Ophthalmology and Visual Sciences Academic Clinical Program, Singapore, 169857, Singapore.,Ophthalmology, Yong Loo Lin Medical School, National University of Singapore, Singapore, 119228, Singapore
| | - Hannu Uusitalo
- Department of Ophthalmology, Faculty of Medicine and Life Sciences, University of Tampere, Tampere, 33014, Finland.,Tays Eye Centre, Tampere University Hospital, Tampere, 33521, Finland
| | - Matti Nykter
- Prostate Cancer Research Center, Faculty of Medicine and Life Sciences and BioMediTech Institute, University of Tampere, Tampere, 33014, Finland. .,Science Center, Tampere University Hospital, Tampere, 33521, Finland.
| | - Tapio Visakorpi
- Prostate Cancer Research Center, Faculty of Medicine and Life Sciences and BioMediTech Institute, University of Tampere, Tampere, 33014, Finland. .,FimLab Laboratories, Tampere University Hospital, Tampere, 33101, Finland.
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5
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Presence of TMPRSS2-ERG is associated with alterations of the metabolic profile in human prostate cancer. Oncotarget 2018; 7:42071-42085. [PMID: 27276682 PMCID: PMC5173117 DOI: 10.18632/oncotarget.9817] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 05/16/2016] [Indexed: 12/23/2022] Open
Abstract
TMPRSS2-ERG has been proposed to be a prognostic marker for prostate cancer. The aim of this study was to identify changes in metabolism, genes and biochemical recurrence related to TMPRSS2-ERG by using an integrated approach, combining metabolomics, transcriptomics, histopathology and clinical data in a cohort of 129 human prostate samples (41 patients). Metabolic analyses revealed lower concentrations of citrate and spermine comparing ERGhigh to ERGlow samples, suggesting an increased cancer aggressiveness of ERGhigh compared to ERGlow. These results could be validated in a separate cohort, consisting of 40 samples (40 patients), and magnetic resonance spectroscopy imaging (MRSI) indicated an in vivo translational potential. Alterations of gene expression levels associated with key enzymes in the metabolism of citrate and polyamines were in consistence with the metabolic results. Furthermore, the metabolic alterations between ERGhigh and ERGlow were more pronounced in low Gleason samples than in high Gleason samples, suggesting it as a potential tool for risk stratification. However, no significant difference in biochemical recurrence was detected, although a trend towards significance was detected for low Gleason samples. Using an integrated approach, this study suggests TMPRSS2-ERG as a potential risk stratification tool for inclusion of active surveillance patients.
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Anderson NM, Mucka P, Kern JG, Feng H. The emerging role and targetability of the TCA cycle in cancer metabolism. Protein Cell 2017; 9:216-237. [PMID: 28748451 PMCID: PMC5818369 DOI: 10.1007/s13238-017-0451-1] [Citation(s) in RCA: 299] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 06/26/2017] [Indexed: 02/08/2023] Open
Abstract
The tricarboxylic acid (TCA) cycle is a central route for oxidative phosphorylation in cells, and fulfills their bioenergetic, biosynthetic, and redox balance requirements. Despite early dogma that cancer cells bypass the TCA cycle and primarily utilize aerobic glycolysis, emerging evidence demonstrates that certain cancer cells, especially those with deregulated oncogene and tumor suppressor expression, rely heavily on the TCA cycle for energy production and macromolecule synthesis. As the field progresses, the importance of aberrant TCA cycle function in tumorigenesis and the potentials of applying small molecule inhibitors to perturb the enhanced cycle function for cancer treatment start to evolve. In this review, we summarize current knowledge about the fuels feeding the cycle, effects of oncogenes and tumor suppressors on fuel and cycle usage, common genetic alterations and deregulation of cycle enzymes, and potential therapeutic opportunities for targeting the TCA cycle in cancer cells. With the application of advanced technology and in vivo model organism studies, it is our hope that studies of this previously overlooked biochemical hub will provide fresh insights into cancer metabolism and tumorigenesis, subsequently revealing vulnerabilities for therapeutic interventions in various cancer types.
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Affiliation(s)
- Nicole M Anderson
- Abramson Family Cancer Research Institute, University of Pennsylvania, Philadelphia, PA, 19104-6160, USA.,Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Patrick Mucka
- Departments of Pharmacology and Medicine, The Center for Cancer Research, Section of Hematology and Medical Oncology, Boston University School of Medicine, Boston, MA, 02118, USA
| | - Joseph G Kern
- Program in Biomedical Sciences, Boston University School of Medicine, Boston, MA, 02118, USA
| | - Hui Feng
- Departments of Pharmacology and Medicine, The Center for Cancer Research, Section of Hematology and Medical Oncology, Boston University School of Medicine, Boston, MA, 02118, USA.
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7
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Yamada S, Kotake Y, Demizu Y, Kurihara M, Sekino Y, Kanda Y. NAD-dependent isocitrate dehydrogenase as a novel target of tributyltin in human embryonic carcinoma cells. Sci Rep 2014; 4:5952. [PMID: 25092173 PMCID: PMC4121607 DOI: 10.1038/srep05952] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 07/15/2014] [Indexed: 11/20/2022] Open
Abstract
Tributyltin (TBT) is known to cause developmental defects as endocrine disruptive chemicals (EDCs). At nanomoler concentrations, TBT actions were mediated by genomic pathways via PPAR/RXR. However, non-genomic target of TBT has not been elucidated. To investigate non-genomic TBT targets, we performed comprehensive metabolomic analyses using human embryonic carcinoma NT2/D1 cells. We found that 100 nM TBT reduced the amounts of α-ketoglutarate, succinate and malate. We further found that TBT decreased the activity of NAD-dependent isocitrate dehydrogenase (NAD-IDH), which catalyzes the conversion of isocitrate to α-ketoglutarate in the TCA cycle. In addition, TBT inhibited cell growth and enhanced neuronal differentiation through NAD-IDH inhibition. Furthermore, studies using bacterially expressed human NAD-IDH and in silico simulations suggest that TBT inhibits NAD-IDH due to a possible interaction. These results suggest that NAD-IDH is a novel non-genomic target of TBT at nanomolar levels. Thus, a metabolomic approach may provide new insights into the mechanism of EDC action.
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Affiliation(s)
- Shigeru Yamada
- Division of Pharmacology, National Institute of Health Sciences, Tokyo, Japan
| | - Yaichiro Kotake
- Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Yosuke Demizu
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, Japan
| | - Masaaki Kurihara
- Division of Organic Chemistry, National Institute of Health Sciences, Tokyo, Japan
| | - Yuko Sekino
- Division of Pharmacology, National Institute of Health Sciences, Tokyo, Japan
| | - Yasunari Kanda
- Division of Pharmacology, National Institute of Health Sciences, Tokyo, Japan
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8
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Tsui KH, Chung LC, Wang SW, Feng TH, Chang PL, Juang HH. Hypoxia upregulates the gene expression of mitochondrial aconitase in prostate carcinoma cells. J Mol Endocrinol 2013; 51:131-41. [PMID: 23709747 DOI: 10.1530/jme-13-0090] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hypoxia induces metabolic alteration in cancer cells by stabilizing hypoxia-inducible factor 1α (HIF-1α (HIF1A)), which regulates the bioenergetic genes of glycolysis and lipid metabolic pathways. However, the target genes of hypoxia-induced metabolic alterations in the prostate remain uncertain. Mitochondrial aconitase (mACON) (ACONM) is an enzyme that is central to carbohydrate and energy metabolism and is responsible for the interconversion of citrate to isocitrate as part of the citric acid cycle in the human prostate. We evaluated the effects of the molecular mechanisms of hypoxia on mACON gene expression in PC-3 and LNCaP human prostate carcinoma cells. Immunoblotting assays revealed that hypoxia modulated mACON and lactate dehydrogenase A (LDHA) protein expression, while these effects were attenuated when HIF-1α was knocked down. Hypoxia induced fatty acid synthase (FASN) in PC-3 cells while hypoxia blocked FASN gene expression in LNCaP cells after 24-h incubation. Results of real-time RT-qPCR, immunoblotting, and transient gene expression assays revealed that hypoxia treatment or co-transfection with HIF-1α expression vector enhanced gene expression of mACON, implying that hypoxia modulated mACON at the transcriptional level. Hypoxia-induced mACON promoter activity is dependent on the DNA fragment located at -1013 to -842 upstream of the translation initiation site. l-mimosine, an iron chelator, stabilized HIF-1α but downregulated mACON gene expression, suggesting that iron chelation blocked the hypoxia-induced mACON gene expression. These results suggest that hypoxia dysregulates the expressions of LDHA, FASN, and mACON genes, and the hypoxia-induced mACON gene expression is via the HIF-1α-dependent and iron-dependent pathways in prostate carcinoma cells.
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Affiliation(s)
- Ke-Hung Tsui
- Department of Urology, Chang Gung Memorial Hospital, Kwei-Shan, Tao-Yuan, Taiwan
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9
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Carraway RE, Dobner PR. Zinc pyrithione induces ERK- and PKC-dependent necrosis distinct from TPEN-induced apoptosis in prostate cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2011; 1823:544-57. [PMID: 22027089 DOI: 10.1016/j.bbamcr.2011.09.013] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 09/09/2011] [Accepted: 09/13/2011] [Indexed: 10/16/2022]
Abstract
Zinc dyshomeostasis can induce cell death. However, the mechanisms involved have not been fully elucidated in prostate cancer (PCa) cells, which differ dramatically from normal cells in their zinc handling ability. Here, we studied the effects of the ionophore Zn-pyrithione (ZP) and the chelator N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN). Both compounds induced cell death at micromolar concentrations when incubated with androgen-dependent (LNCaP), androgen-independent (PC3, DU145) and androgen-sensitive (C4-2) PCa cell-lines. Compared to PCa cells, RWPE1 prostate epithelial cells were less sensitive to ZP and more sensitive to TPEN, but total cellular zinc levels were changed similarly. ZnSO4 enhanced the toxicity of ZP, but inhibited the effects of TPEN as expected. The morphological/biochemical responses to ZP and TPEN differed. ZP decreased ATP levels and stimulated ERK, AKT and PKC phosphorylation. DNA laddering was observed only at low doses of ZP but all doses of TPEN. TPEN activated caspase 3/7 and induced PARP-cleavage, DNA-fragmentation, ROS-formation and apoptotic bodies. PKC and ERK-pathway inhibitors, and antioxidants protected against ZP-induced but not TPEN-induced death. Inhibitors of MPTP-opening protected both. Cell death in response to TPEN (but not ZP) was diminished by a calpain inhibitor and largely prevented by a caspase 3 inhibitor. Overall, the results indicated primarily a necrotic cell death for ZP and an apoptotic cell death for TPEN. The enhanced sensitivity of PCa cells to ZP and the apparent ability of ZP and TPEN to kill quiescent and rapidly dividing cells in a p53-independent manner suggest that ZP/TPEN might be used to develop adjunct treatments for PCa.
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Affiliation(s)
- Robert E Carraway
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA 01655, USA.
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10
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Tsui KH, Feng TH, Lin YF, Chang PL, Juang HH. p53 downregulates the gene expression of mitochondrial aconitase in human prostate carcinoma cells. Prostate 2011; 71:62-70. [PMID: 20607720 DOI: 10.1002/pros.21222] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND Mitochondrial aconitase (mACON) is regarded as the key enzyme in citrate oxidation in human prostate epithelial cells, and its abnormal expression has been implicated in tumorigenesis of the prostate. Evidence also supports a broad role for the p53 gene in suppressing prostatic tumorigenesis. We investigated whether p53 regulates mACON expression and explore the potential mechanisms responsible for its effect on prostate cancer cells. METHODS Camptothecin (CPT) treatments and transient overexpression of p53 were used to investigate p53 regulation of mACON and may effects were assessed using immunoblotting and transient gene expression assays. RESULTS In vitro enzymatic activity assays and immunoblot assays showed that CPT treatment induced p53 expression while reducing mACON protein biosynthesis in wild-type p53 expressing LNCaP cells. Immunoblot assays and reporter assays revealed that transient transfection of a p53 expression vector into p53-null PC-3 cells decreased mACON expression. Cyclic pifithrin-α, an inhibitor of p53 transcriptional activity, blocked the decrease in mACON gene expression resulting from CPT treatment in LNCaP cells. Two putative p53 response elements were identified within the mACON promoter; however, mutation of these putative p53 response elements did not abolish the effect of CPT whereby it decreased mACON expression. A similar result was obtained for the effect of these mutants on the promoter activity of the mACON gene after transient overexpression of p53. CONCLUSIONS Together these results suggest that p53 downregulation of mACON gene expression in human prostate carcinoma cells may not occur through the putative consensus p53 response elements found within the mACON promoter.
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Affiliation(s)
- Ke-Hung Tsui
- Department of Urology, Chang Gung Memory Hospital-Linko, Kwei-Shan, Tao-Yuan, Taiwan, ROC
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11
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Khandrika L, Kumar B, Koul S, Maroni P, Koul HK. Oxidative stress in prostate cancer. Cancer Lett 2009; 282:125-36. [PMID: 19185987 PMCID: PMC2789743 DOI: 10.1016/j.canlet.2008.12.011] [Citation(s) in RCA: 347] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Revised: 12/03/2008] [Accepted: 12/04/2008] [Indexed: 02/07/2023]
Abstract
As prostate cancer and aberrant changes in reactive oxygen species (ROS) become more common with aging, ROS signaling may play an important role in the development and progression of this malignancy. Increased ROS, otherwise known as oxidative stress, is a result of either increased ROS generation or a loss of antioxidant defense mechanisms. Oxidative stress is associated with several pathological conditions including inflammation and infection. ROS are products of normal cellular metabolism and play vital roles in stimulation of signaling pathways in response to changing intra- and extracellular environmental conditions. Chronic increases in ROS over time are known to induce somatic mutations and neoplastic transformation. In this review we summarize the causes for increased ROS generation and its potential role in etiology and progression of prostate cancer.
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Affiliation(s)
- Lakshmipathi Khandrika
- Signal transduction and Molecular Urology Laboratory-Program in Urosciences, Division of Urology- Department of Surgery, School of Medicine, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
| | - Binod Kumar
- Signal transduction and Molecular Urology Laboratory-Program in Urosciences, Division of Urology- Department of Surgery, School of Medicine, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
| | - Sweaty Koul
- Signal transduction and Molecular Urology Laboratory-Program in Urosciences, Division of Urology- Department of Surgery, School of Medicine, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
| | - Paul Maroni
- Signal transduction and Molecular Urology Laboratory-Program in Urosciences, Division of Urology- Department of Surgery, School of Medicine, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
- University of Colorado Comprehensive Cancer Center, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
| | - Hari K. Koul
- Signal transduction and Molecular Urology Laboratory-Program in Urosciences, Division of Urology- Department of Surgery, School of Medicine, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
- University of Colorado Comprehensive Cancer Center, University of Colorado at Denver, Building P15 or RC2, 12700 E 19th Avenue, Room number 6430D, Aurora, CO 80045, USA
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12
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Matasova LV, Popova TN. Aconitate hydratase of mammals under oxidative stress. BIOCHEMISTRY. BIOKHIMIIA 2008; 73:957-64. [PMID: 18976211 PMCID: PMC7087844 DOI: 10.1134/s0006297908090010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/28/2007] [Revised: 12/20/2007] [Indexed: 12/14/2022]
Abstract
Data on the structure, functions, regulation of activity, and expression of cytosolic and mitochondrial aconitate hydratase isoenzymes of mammals are reviewed. The role of aconitate hydratase and structurally similar iron-regulatory protein in maintenance of homeostasis of cell iron is described. Information on modifications of the aconitate hydratase molecule and changes in expression under oxidative stress is generalized. The role of aconitate hydratase in the pathogenesis of some diseases is considered.
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Affiliation(s)
- L V Matasova
- Voronezh State University, Voronezh, 394006, Russia.
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13
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Chen JQ, Brown TR, Yager JD. Mechanisms of hormone carcinogenesis: evolution of views, role of mitochondria. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008. [PMID: 18637481 DOI: 10.1007/978-0-387-78818-0_1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
CumuIative and excessive exposure to estrogens is associated with increased breast cancer risk. The traditional mechanism explaining this association is that estrogens affect the rate of cell division and apoptosis and thus manifest their effect on the risk of breast cancer by affecting the growth of breast epithelial tissues. Highly proliferative cells are susceptible to genetic errors during DNA replication. The action of estrogen metabolites offers a complementary genotoxic pathway mediated by the generation of reactive estrogen quinone metabolites that can form adducts with DNA and generate reactive oxygen species through redox cycling. In this chapter, we discussed a novel mitochondrial pathway mediated by estrogens and their cognate estrogen receptors (ERs) and its potential implications in estrogen-dependent carcinogenesis. Several lines of evidence are presented to show: (1) mitochondrial localization of ERs in human breast cancer cells and other cell types; (2) a functional role for the mitochondrial ERs in regulation of the mitochondrial respiratory chain (MRC) proteins and (3) potential implications of the mitochondrial ER-mediated pathway in stimulation of cell proliferation, inhibition of apoptosis and oxidative damage to mitochondrial DNA. The possible involvement of estrogens and ERs in deregulation of mitochondrial bioenergetics, an important hallmark of cancer cells, is also described. An evolutionary view is presented to suggest that persistent stimulation by estrogens through ER signaling pathways of MRC proteins and energy metabolic pathways leads to the alterations in mitochondrial bioenergetics and contributes to the development of estrogen-related cancers.
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Affiliation(s)
- Jin-Qiang Chen
- Division of Pulmonary and Critical Care, Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA 22908-0546, USA.
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14
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Armstrong JS. Mitochondrial medicine: pharmacological targeting of mitochondria in disease. Br J Pharmacol 2007; 151:1154-65. [PMID: 17519949 PMCID: PMC2189819 DOI: 10.1038/sj.bjp.0707288] [Citation(s) in RCA: 155] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Mitochondria play a central role in cell life and death and are known to be important in a wide range of diseases including the cancer, diabetes, cardiovascular disease, and the age-related neurodegenerative diseases. The unique structural and functional characteristics of mitochondria enable the selective targeting of drugs designed to modulate the function of this organelle for therapeutic gain. This review discusses mitochondrial drug targeting strategies and a variety of novel mitochondrial drug targets including the electron transport chain, mitochondrial permeability transition, Bcl-2 family proteins and mitochondrial DNA. Mitochondrial drug-targeting strategies will open up avenues for manipulating mitochondrial functions and allow for selective protection or eradication of cells for therapeutic gain in a variety of diseases.
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Affiliation(s)
- J S Armstrong
- Department of Biochemistry, Faculty of Medicine, National University of SingaporeSingapore
- Author for correspondence:
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15
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Tsui KH, Chang PL, Juang HH. Manganese antagonizes iron blocking mitochondrial aconitase expression in human prostate carcinoma cells. Asian J Androl 2006; 8:307-15. [PMID: 16625280 DOI: 10.1111/j.1745-7262.2006.00139.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
AIM To investigate the possible role of manganese in the regulation of mitochondrial aconitase (mACON) activity human prostate carcinoma cell line PC-3 cells. METHODS The mACON enzymatic activities of human prostate carcinoma cell line PC-3 cells were determined using a reduced nicotinamide adenine dinucleotide-coupled assay. Immunoblot and transient gene expression assays were used to study gene expression of the mACON. The putative response element for gene expression was identified using reporter assays with site-directed mutagenesis and electrophoretic mobility-shift assays. RESULTS In vitro study revealed that manganese chloride (MnCl2) treatment for 16 h inhibited the enzymatic activity of mACON, which induced the inhibition of citrate utility and cell proliferation of PC-3 cells. Although results from transient gene expression assays showed that MnCl2 treatment upregulated gene translation by approximately 5-fold through the iron response element pathway, immunoblot and reporter assays showed that MnCl2 treatments inhibited protein and gene expression of mACON. This effect was reversed by co-treatment with ferric ammonium citrate. Additional reporter assays with site-directed mutagenesis and electrophoretic mobility-shift assays suggested that a putative metal response element in the promoter of the mACON gene was involved in the regulation of MnCl2 on the gene expression of mACON. CONCLUSION These findings suggest that manganese acts as an antagonist of iron, disrupting the enzymatic activity and gene expression of mACON and citrate metabolism in the prostate.
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Affiliation(s)
- Ke-Hung Tsui
- Department of Anatomy, Chang Gung University, 259 Wen-Hua 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan, China
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Yu Z, Costello LC, Feng P, Franklin RB. Characterization of the mitochondrial aconitase promoter and the identification of transcription factor binding. Prostate 2006; 66:1061-9. [PMID: 16598741 DOI: 10.1002/pros.20442] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Mitochondrial (m) aconitase plays an important role in the unique pathway of citrate accumulation in prostate epithelial cells through its limited activity. In the current study, we characterized the human m-aconitase gene promoter. METHODS A 1,411-bp 5'-flanking fragment of the human m-aconitase gene was cloned, followed by 5' serial deletion analysis of promoter activity. Transcriptional start sties and transcription factors bound to the promoter were identified by 5' RACE, DNA pull-down assay and transcription factor array analysis. RESULTS Two transcriptional start sites were identified. The promoter fragment pulled down 15 transcription factors, some without consensus sequences in the promoter. Deletion of one Sp1 site eliminated all promoter activity. CONCLUSIONS The m-aconitase promoter is contained in a 153-bp 5' fragment lacking a TATA or CAAT sequence. Sp1 binding to a specific Sp1 site is required for promoter activity while other transcription factors are recruited through protein-protein interactions.
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Affiliation(s)
- Ziqiang Yu
- Department of Biomedical Sciences, Dental School, University of Maryland, Baltimore, Maryland 21201, USA
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Singh KK, Desouki MM, Franklin RB, Costello LC. Mitochondrial aconitase and citrate metabolism in malignant and nonmalignant human prostate tissues. Mol Cancer 2006; 5:14. [PMID: 16595004 PMCID: PMC1484490 DOI: 10.1186/1476-4598-5-14] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Accepted: 04/04/2006] [Indexed: 11/25/2022] Open
Abstract
Background In prostate cancer, normal citrate-producing glandular secretory epithelial cells undergo a metabolic transformation to malignant citrate-oxidizing cells. m-Aconitase is the critical step involved in this altered citrate metabolism that is essential to prostate malignancy. The limiting m-aconitase activity in prostate epithelial cells could be the result of a decreased level of m-aconitase enzyme and/or the inhibition of existing m-aconitase. Earlier studies identified zinc as an inhibitor of m-aconitase activity in prostate cells; and that the depletion of zinc in malignant cells is an important factor in this metabolic transformation. However, a possibility remains that an altered expression and level of m-aconitase enzyme might also be involved in this metabolic transformation. To address this issue, the in situ level of m-aconitase enzyme was determined by immunohistochemical analysis of prostate cancer tissue sections and malignant prostate cell lines. Results The immunocytochemical procedure successfully identified the presence of m-aconitase localized in the mitochondrial compartment in PC-3, LNCaP, and DU-145 malignant prostate cell lines. The examination of prostate tissue sections from prostate cancer subjects demonstrated that m-aconitase enzyme is present in the glandular epithelium of normal glands, hyperplastic glands, adenocrcinomatous glands, and prostatic intraepithelial neoplastic foci. Quantitative analysis of the relative level of m-aconitase in the glandular epithelium of citrate-producing adenomatous glands versus the citrate-oxidizing adenocarcinomatous glands revealed no significant difference in m-aconitase enzyme levels. This is in contrast to the down-regulation of ZIP1 zinc transporter in the malignant glands versus hyperplastic glands that exists in the same tissue samples. Conclusion The results demonstrate the existence of m-aconitase enzyme in the citrate-producing glandular epithelial cells; so that deficient m-aconitase enzyme is not associated with the limiting m-aconitase activity that prevents citrate oxidation in these cells. The level of m-aconitase is maintained in the malignant cells; so that an altered enzyme level is not associated with the increased m-aconitase activity. Consequently, the elevated zinc level that inhibits m-aconitase enzyme is responsible for the impaired citrate oxidation in normal and hyperplastic prostate glandular epithelial cells. Moreover, the down-regulation of ZIP1 zinc transporter and corresponding depletion of zinc results in the increase in the activity of the existing m-aconitase activity in the malignant prostate cells. The studies now define the mechanism for the metabolic transformation that characterizes the essential transition of normal citrate-producing epithelial cells to malignant citrate-oxidizing cells.
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Affiliation(s)
- Keshav K Singh
- Department of Cancer Genetics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Mohamed M Desouki
- Department of Cancer Genetics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
- Department of Pathology Duke University Medical Center, Durham, NC 27710, USA
| | - Renty B Franklin
- Department of Biomedical Sciences, University of Maryland, Baltimore, MD 21201, USA
| | - Leslie C Costello
- Department of Biomedical Sciences, University of Maryland, Baltimore, MD 21201, USA
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Tsui KH, Chang PL, Juang HH. Zinc blocks gene expression of mitochondrial aconitase in human prostatic carcinoma cells. Int J Cancer 2006; 118:609-15. [PMID: 16094633 DOI: 10.1002/ijc.21411] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mitochondrial aconitase (mACON) contains a [4Fe-4S] cluster as the key enzyme for citrate oxidation in the human prostatic epithelial cell. Although there is accumulating evidence indicating that accumulation of high levels of zinc in prostate epithelial cells causes reduced efficiency of citrate oxidation, zinc regulation on the mACON is still not well understood. From in vitro studies, zinc chloride treatment has been developed using humic acid as the carrier (Zn-HA) in human prostatic carcinoma cells, PC-3. Zn-HA treatment (0.1-10 microM) restricts mACON enzymatic activity, which attenuates citrate utility and decreases intracellular ATP levels in PC-3 cells, whereas the effect is blocked by adding the zinc chelator, diethylenetriaminepentaacetic acid (DTPA). Immunoblot, ribonuclease-protection and transient gene-expression assays indicate that Zn-HA treatments inhibit mACON gene expression. Mutation of the putative metal response element (MRE) from CTCGCCTTCA to TGATCCTTCA abolishes Zn-HA inhibition of mACON promoter activity. Our results have demonstrated that zinc possesses a specific regulatory mechanism on the mACON gene, and a biologic function of the putative metal regulatory system in mACON gene transcription has been identified.
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Affiliation(s)
- Ke-Hung Tsui
- Department of Urology, Chang Gung Memorial Hospital, Kwei-Shan, Taiwan, Republic of China
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Liew YF, Shaw NS. Mitochondrial cysteine desulfurase iron-sulfur cluster S and aconitase are post-transcriptionally regulated by dietary iron in skeletal muscle of rats. J Nutr 2005; 135:2151-8. [PMID: 16140891 DOI: 10.1093/jn/135.9.2151] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Cysteine desulfurase IscS is required for cellular iron-sulfur protein maturation in eukaryotes and prokaryotes. In this study, we examined the effect of dietary iron intake on the expression in rat skeletal muscle of IscS in relation to 2 iron-sulfur proteins, cytosolic aconitase (c-aconitase) and mitochondrial aconitase (m-aconitase). Three groups of male weanling Wistar rats were used; 1 group was fed an iron-deficient diet (D), and the other 2 groups were pair-fed (P) or freely fed (C) a control (35 mg Fe/kg diet) diet for 1 or 2 wk. At the end of wk 1 and 2, the mitochondrial IscS protein levels in the skeletal muscle of iron-deficient rats had decreased to 45 and 50% of those of the control and pair-fed rats, respectively, whereas the IscS mRNA levels did not differ among the 3 groups, indicating that iron deficiency affected the expression of IscS protein at the post-transcriptional level. Iron deficiency caused a 55-76% reduction in c-aconitase activity and an approximately 50% reduction in the c-aconitase protein level. The m-aconitase activity and protein level in iron-deficient rats also declined to 50 and 58-64% of the control levels, respectively. Our results indicate that dietary iron modulates mitochondrial IscS protein and aconitase at the post-transcriptional level, and mitochondrial IscS may be associated with this regulation of aconitase in skeletal muscle.
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Affiliation(s)
- Yih-Fong Liew
- Institute of Microbiology and Biochemistry, National Taiwan University, Taipei, Taiwan
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Juang HH. Modulation of iron on mitochondrial aconitase expression in human prostatic carcinoma cells. Mol Cell Biochem 2005; 265:185-94. [PMID: 15543948 DOI: 10.1023/b:mcbi.0000044395.59739.1f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The mitochondrial aconitase (mACON) containing a [4Fe-4S] cluster is regarded as the key enzyme for citrate oxidation in the epithelial cells of human prostate. In vitro studies using the human prostatic carcinoma cells, PC-3 cells, found that both hemin and ferric ammonium citrate (FAC) significantly increased mACON enzymatic activity and gene expression. The effect of FAC on mACON was enhanced 2-fold by co-treating with ascorbic acid but blocked by co-treating with iron chelator, deferoxamine mesylate. Hemin treatments blocked 30% of citrate secretion from PC-3 cells but upregualted 2-fold of intracellular ATP biosynthesis. Results from reporter assay by using a cytomegalovirus enhance/promoter driven luciferase mRNA ligated to the iron response element (IRE) of mACON as a reporter construct demonstrated that modulation of FAC on gene translation of mACON gene is dependent on the IRE. Transient gene expression assays indicated that upregulation of mACON gene transcription by FAC may through the putative antioxidant response element (ARE) signal pathway. This study provides the first evidence of the biologic mechanism of human mACON gene translation/transcription and suggests a regulatory link between the energy utilization and the iron metabolism in human prostatic carcinoma cells.
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Affiliation(s)
- Horng-Heng Juang
- Department of Anatomy, Chang Gung University, Tao-Yuan 333, Taiwan, ROC.
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