101
|
Shikonin regulates C-MYC and GLUT1 expression through the MST1-YAP1-TEAD1 axis. Exp Cell Res 2016; 349:273-281. [PMID: 27793648 DOI: 10.1016/j.yexcr.2016.10.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 10/19/2016] [Accepted: 10/22/2016] [Indexed: 11/21/2022]
Abstract
The general mechanism underlying the tumor suppressor activity of the Hippo signaling pathway remains unclear. In this study, we explore the molecular mechanisms connecting the Hippo signaling pathway with glucose metabolism. We have found that two key regulators of glycolysis, C-MYC and GLUT1, are targets of the Hippo signaling pathway in human leukemia cells. Our results revealed that activation of MST1 by the natural compound shikonin inhibited the expression of GLUT1 and C-MYC. Furthermore, RNAi experiments confirmed the regulation of GLUT1 and C-MYC expression via the MST1-YAP1-TEAD1 axis. Surprisingly, YAP1 was found to positively regulate C-MYC mRNA levels in complex with TEAD1, while it negatively regulates C-MYC levels in cooperation with MST1. Hence, YAP1 serves as a rheostat for C-MYC, which is regulated by MST1. In addition, depletion of MST1 stimulates lactate production, whereas the specific depletion of TEAD1 has an opposite effect. The inhibition of lactate production and cellular proliferation induced by shikonin also depends on the Hippo pathway activity. Finally, a bioinformatic analysis revealed conserved TEAD-binding motifs in the C-MYC and GLUT1 promoters providing another molecular data supporting our observations. In summary, regulation of glucose metabolism could serve as a new tumor suppressor mechanism orchestrated by the Hippo signaling pathway.
Collapse
|
102
|
Nimri L, Saadi J, Peri I, Yehuda-Shnaidman E, Schwartz B. Mechanisms linking obesity to altered metabolism in mice colon carcinogenesis. Oncotarget 2016; 6:38195-209. [PMID: 26472027 PMCID: PMC4741993 DOI: 10.18632/oncotarget.5561] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 09/29/2015] [Indexed: 12/20/2022] Open
Abstract
There are an increasing number of reports on obesity being a key risk factor for the development of colon cancer. Our goal in this study was to explore the metabolic networks and molecular signaling pathways linking obesity, adipose tissue and colon cancer. Using in-vivo experiments, we found that mice fed a high-fat diet (HFD) and injected with MC38 colon cancer cells develop significantly larger tumors than their counterparts fed a control diet. In ex-vivo experiments, MC38 and CT26 colon cancer cells exposed to conditioned media (CM) from the adipose tissue of HFD-fed mice demonstrated significantly lower oxygen consumption rate as well as lower maximal oxygen consumption rate after carbonyl cyanide-4-trifluoromethoxy-phenylhydrazone treatment. In addition, in-vitro assays showed downregulated expression of mitochondrial genes in colon cancer cells exposed to CM prepared from the visceral fat of HFD-fed mice or to leptin. Interestingly, leptin levels detected in the media of adipose tissue explants co-cultured with MC38 cancer cells were higher than in adipose tissue explants cultures, indicating cross talk between the adipose tissue and the cancer cells. Salient findings of the present study demonstrate that this crosstalk is mediated at least partially by the JNK/STAT3-signaling pathway.
Collapse
Affiliation(s)
- Lili Nimri
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Janan Saadi
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Irena Peri
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Einav Yehuda-Shnaidman
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Betty Schwartz
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Jerusalem, Israel
| |
Collapse
|
103
|
Yang Y, Karakhanova S, Hartwig W, D'Haese JG, Philippov PP, Werner J, Bazhin AV. Mitochondria and Mitochondrial ROS in Cancer: Novel Targets for Anticancer Therapy. J Cell Physiol 2016; 231:2570-81. [PMID: 26895995 DOI: 10.1002/jcp.25349] [Citation(s) in RCA: 387] [Impact Index Per Article: 48.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 02/16/2016] [Indexed: 12/11/2022]
Abstract
Mitochondria are indispensable for energy metabolism, apoptosis regulation, and cell signaling. Mitochondria in malignant cells differ structurally and functionally from those in normal cells and participate actively in metabolic reprogramming. Mitochondria in cancer cells are characterized by reactive oxygen species (ROS) overproduction, which promotes cancer development by inducing genomic instability, modifying gene expression, and participating in signaling pathways. Mitochondrial and nuclear DNA mutations caused by oxidative damage that impair the oxidative phosphorylation process will result in further mitochondrial ROS production, completing the "vicious cycle" between mitochondria, ROS, genomic instability, and cancer development. The multiple essential roles of mitochondria have been utilized for designing novel mitochondria-targeted anticancer agents. Selective drug delivery to mitochondria helps to increase specificity and reduce toxicity of these agents. In order to reduce mitochondrial ROS production, mitochondria-targeted antioxidants can specifically accumulate in mitochondria by affiliating to a lipophilic penetrating cation and prevent mitochondria from oxidative damage. In consistence with the oncogenic role of ROS, mitochondria-targeted antioxidants are found to be effective in cancer prevention and anticancer therapy. A better understanding of the role played by mitochondria in cancer development will help to reveal more therapeutic targets, and will help to increase the activity and selectivity of mitochondria-targeted anticancer drugs. In this review we summarized the impact of mitochondria on cancer and gave summary about the possibilities to target mitochondria for anticancer therapies. J. Cell. Physiol. 231: 2570-2581, 2016. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Yuhui Yang
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Department of General Surgery, University of Heidelberg, Heidelberg, Germany
| | | | - Werner Hartwig
- Department of General, Visceral, and Transplant Surgery, Ludwig-Maximilians-University, Munich, Germany
| | - Jan G D'Haese
- Department of General, Visceral, and Transplant Surgery, Ludwig-Maximilians-University, Munich, Germany
| | - Pavel P Philippov
- Department of Cell Signalling, Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia
| | - Jens Werner
- Department of General, Visceral, and Transplant Surgery, Ludwig-Maximilians-University, Munich, Germany
| | - Alexandr V Bazhin
- Department of General, Visceral, and Transplant Surgery, Ludwig-Maximilians-University, Munich, Germany
| |
Collapse
|
104
|
Khaliullina H, Love NK, Harris WA. Nutrient-Deprived Retinal Progenitors Proliferate in Response to Hypoxia: Interaction of the HIF-1 and mTOR Pathway. J Dev Biol 2016; 4. [PMID: 27280081 PMCID: PMC4894462 DOI: 10.3390/jdb4020017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
At a cellular level, nutrients are sensed by the mechanistic Target of Rapamycin (mTOR). The response of cells to hypoxia is regulated via action of the oxygen sensor Hypoxia-Inducible Factor 1 (HIF-1). During development, injury and disease, tissues might face conditions of both low nutrient supply and low oxygen, yet it is not clear how cells adapt to both nutrient restriction and hypoxia, or how mTOR and HIF-1 interact in such conditions. Here we explore this question in vivo with respect to cell proliferation using the ciliary marginal zone (CMZ) of Xenopus. We found that both nutrient-deprivation and hypoxia cause retinal progenitors to decrease their proliferation, yet when nutrient-deprived progenitors are exposed to hypoxia there is an unexpected rise in cell proliferation. This increase, mediated by HIF-1 signalling, is dependent on glutaminolysis and reactivation of the mTOR pathway. We discuss how these findings in non-transformed tissue may also shed light on the ability of cancer cells in poorly vascularised solid tumours to proliferate.
Collapse
Affiliation(s)
- Helena Khaliullina
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK;
| | - Nicola K Love
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK;
| | - William A Harris
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK;
| |
Collapse
|
105
|
Kappler M, Pabst U, Rot S, Taubert H, Wichmann H, Schubert J, Bache M, Weinholdt C, Immel UD, Grosse I, Vordermark D, Eckert AW. Normoxic accumulation of HIF1α is associated with glutaminolysis. Clin Oral Investig 2016; 21:211-224. [PMID: 26955835 DOI: 10.1007/s00784-016-1780-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/29/2016] [Indexed: 02/06/2023]
Abstract
OBJECTIVES The stabilization of the transcription factor and prognostic tumor marker hypoxia-inducible factor 1α (HIF1α) is considered to be crucial for cellular metabolic adaptations to hypoxia. However, HIF1α has also been shown to accumulate under normoxic conditions, although this phenomenon is poorly understood. METHODS We investigated the conditions for normoxic HIF1α stabilization in different tumor cell lines (e.g., two mammary carcinoma cell lines and three oral squamous cell carcinoma cell lines) via Western blot analysis or immunohistochemical staining. The transcriptional activity of HIF1 was demonstrated by analyzing the messenger RNA (mRNA) expression of the HIF1 target carbonic anhydrase 9 (CA9) via PCR. RESULTS Our data demonstrate that the combined incubation of tumor cells with glutamine and growth factors (e.g., EGF, insulin, and serum) mediates the normoxic accumulation of HIF1α in vitro. Consequently, the inhibition of glutaminolysis by a glutaminase inhibitor blocked the normoxic accumulation of HIF1α. Additionally, the normoxic HIF1α protein displayed nuclear translocation and transcriptional activity, which was confirmed by the induction of CA9 mRNA expression. Furthermore, the normoxic accumulation of HIF1α was associated with impaired proliferation of tumor cells. Finally, ammonia, the toxic waste product of glutaminolysis, induced a normoxic accumulation of HIF1α to the same extent as glutamine. CONCLUSION Our study suggests that HIF1α is involved in the regulation of glutamine metabolism and the cellular levels of the toxic metabolic waste product ammonia under normoxia. Hence, our results, together with data presented in the literature, support the hypothesis that HIF1α and its target genes play a crucial role in metabolic pathways, such as glutaminolysis and glycolysis, under both hypoxic and normoxic conditions. CLINICAL RELEVANCE Therefore, the inhibition of HIF1α (and/or HIF1α target genes) could emerge as a promising therapeutic approach that would result in the accumulation of toxic metabolic waste products in tumor cells as well as the reduction of their nutrition and energy supply.
Collapse
Affiliation(s)
- Matthias Kappler
- Department of Oral and Maxillofacial Plastic Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097, Halle(S), Germany.
| | - Ulrike Pabst
- Department of Oral and Maxillofacial Plastic Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097, Halle(S), Germany
| | - Swetlana Rot
- Department of Oral and Maxillofacial Plastic Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097, Halle(S), Germany
| | - Helge Taubert
- Department of Urology, University Hospital Erlangen, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Henri Wichmann
- Department of Oral and Maxillofacial Plastic Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097, Halle(S), Germany
| | - Johannes Schubert
- Department of Oral and Maxillofacial Plastic Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097, Halle(S), Germany
| | - Matthias Bache
- Department of Radiotherapy, Martin Luther University Halle-Wittenberg, Halle(S), Germany
| | - Claus Weinholdt
- Institute of Computer Science, Martin Luther University Halle-Wittenberg, Halle(S), Germany
| | - Uta-Dorothee Immel
- Institute of Legal Medicine, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Ivo Grosse
- Institute of Computer Science, Martin Luther University Halle-Wittenberg, Halle(S), Germany
| | - Dirk Vordermark
- Department of Radiotherapy, Martin Luther University Halle-Wittenberg, Halle(S), Germany
| | - Alexander W Eckert
- Department of Oral and Maxillofacial Plastic Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097, Halle(S), Germany
| |
Collapse
|
106
|
Plecitá-Hlavatá L, Engstová H, Alán L, Špaček T, Dlasková A, Smolková K, Špačková J, Tauber J, Strádalová V, Malínský J, Lessard M, Bewersdorf J, Ježek P. Hypoxic HepG2 cell adaptation decreases ATP synthase dimers and ATP production in inflated cristae by mitofilin down-regulation concomitant to MICOS clustering. FASEB J 2016; 30:1941-57. [PMID: 26887443 DOI: 10.1096/fj.201500176] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 01/24/2016] [Indexed: 01/25/2023]
Abstract
The relationship of the inner mitochondrial membrane (IMM) cristae structure and intracristal space (ICS) to oxidative phosphorylation (oxphos) is not well understood. Mitofilin (subunit Mic60) of the mitochondrial contact site and cristae organizing system (MICOS) IMM complex is attached to the outer membrane (OMM) via the sorting and assembly machinery/topogenesis of mitochondrial outer membrane β-barrel proteins (SAM/TOB) complex and controls the shape of the cristae. ATP synthase dimers determine sharp cristae edges, whereas trimeric OPA1 tightens ICS outlets. Metabolism is altered during hypoxia, and we therefore studied cristae morphology in HepG2 cells adapted to 5% oxygen for 72 h. Three dimensional (3D), super-resolution biplane fluorescence photoactivation localization microscopy with Eos-conjugated, ICS-located lactamase-β indicated hypoxic ICS expansion with an unchanged OMM (visualized by Eos-mitochondrial fission protein-1). 3D direct stochastic optical reconstruction microscopy immunocytochemistry revealed foci of clustered mitofilin (but not MICOS subunit Mic19) in contrast to its even normoxic distribution. Mitofilin mRNA and protein decreased by ∼20%. ATP synthase dimers vs monomers and state-3/state-4 respiration ratios were lower during hypoxia. Electron microscopy confirmed ICS expansion (maximum in glycolytic cells), which was absent in reduced or OMM-detached cristae of OPA1- and mitofilin-silenced cells, respectively. Hypoxic adaptation is reported as rounding sharp cristae edges and expanding cristae width (ICS) by partial mitofilin/Mic60 down-regulation. Mitofilin-depleted MICOS detaches from SAM while remaining MICOS with mitofilin redistributes toward higher interdistances. This phenomenon causes partial oxphos dormancy in glycolytic cells via disruption of ATP synthase dimers.-Plecitá-Hlavatá, L., Engstová, H., Alán, L., Špaček, T., Dlasková, A., Smolková, K., Špačková, J., Tauber, J., Strádalová, V., Malínský, J., Lessard, M., Bewersdorf, J., Ježek, P. Hypoxic HepG2 cell adaptation decreases ATP synthase dimers and ATP production in inflated cristae by mitofilin down-regulation concomitant to MICOS clustering.
Collapse
Affiliation(s)
- Lydie Plecitá-Hlavatá
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Hana Engstová
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Lukáš Alán
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Tomáš Špaček
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Andrea Dlasková
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Katarína Smolková
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Jitka Špačková
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Jan Tauber
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| | - Vendula Strádalová
- Microscopy Unit, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Jan Malínský
- Microscopy Unit, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Mark Lessard
- Institute for Molecular Biophysics, The Jackson Laboratory, Bar Harbor, Maine, USA; and
| | - Joerg Bewersdorf
- Department of Cell Biology, Yale University, New Haven, Connecticut, USA
| | - Petr Ježek
- Department of Membrane Transport Biophysics, Department No. 75, Institute of Physiology, and
| |
Collapse
|
107
|
Maximchik PV, Kulikov AV, Zhivotovsky BD, Gogvadze VG. Cellular energetics as a target for tumor cell elimination. BIOCHEMISTRY (MOSCOW) 2016; 81:65-79. [DOI: 10.1134/s0006297916020012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
108
|
Yuan LW, Yamashita H, Seto Y. Glucose metabolism in gastric cancer: The cutting-edge. World J Gastroenterol 2016; 22:2046-2059. [PMID: 26877609 PMCID: PMC4726677 DOI: 10.3748/wjg.v22.i6.2046] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 09/18/2015] [Accepted: 12/01/2015] [Indexed: 02/06/2023] Open
Abstract
Glucose metabolism in gastric cancer cells differs from that of normal epithelial cells. Upregulated aerobic glycolysis (Warburg effect) in gastric cancer meeting the demands of cell proliferation is associated with genetic mutations, epigenetic modification and proteomic alteration. Understanding the mechanisms of aerobic glycolysis may contribute to our knowledge of gastric carcinogenesis. Metabolomic studies offer novel, convenient and practical tools in the search for new biomarkers for early detection, diagnosis, prognosis, and chemosensitivity prediction of gastric cancer. Interfering with the process of glycolysis in cancer cells may provide a new and promising therapeutic strategy for gastric cancer. In this article, we present a brief review of recent studies of glucose metabolism in gastric cancer, with primary focus on the clinical applications of new biomarkers and their potential therapeutic role in gastric cancer.
Collapse
|
109
|
Chen J, Ge L, Liu A, Yuan Y, Ye J, Zhong J, Liu L, Chen X. Identification of pathways related to FAF1/H. pylori-associated gastric carcinogenesis through an integrated approach based on iTRAQ quantification and literature review. J Proteomics 2016; 131:163-176. [DOI: 10.1016/j.jprot.2015.10.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 10/18/2015] [Accepted: 10/22/2015] [Indexed: 02/06/2023]
|
110
|
Khan AUH, Rathore MG, Allende-Vega N, Vo DN, Belkhala S, Orecchioni S, Talarico G, Bertolini F, Cartron G, Lecellier CH, Villalba M. Human Leukemic Cells performing Oxidative Phosphorylation (OXPHOS) Generate an Antioxidant Response Independently of Reactive Oxygen species (ROS) Production. EBioMedicine 2015; 3:43-53. [PMID: 26870816 PMCID: PMC4739420 DOI: 10.1016/j.ebiom.2015.11.045] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 11/20/2015] [Accepted: 11/25/2015] [Indexed: 11/10/2022] Open
Abstract
Tumor cell metabolism is altered during leukemogenesis. Cells performing oxidative phosphorylation (OXPHOS) generate reactive oxygen species (ROS) through mitochondrial activity. To limit the deleterious effects of excess ROS, certain gene promoters contain antioxidant response elements (ARE), e.g. the genes NQO-1 and HO-1. ROS induces conformational changes in KEAP1 and releases NRF2, which activates AREs. We show in vitro and in vivo that OXPHOS induces, both in primary leukemic cells and cell lines, de novo expression of NQO-1 and HO-1 and also the MAPK ERK5 and decreases KEAP1 mRNA. ERK5 activates the transcription factor MEF2, which binds to the promoter of the miR-23a–27a–24-2 cluster. Newly generated miR-23a destabilizes KEAP1 mRNA by binding to its 3′UTR. Lower KEAP1 levels increase the basal expression of the NRF2-dependent genes NQO-1 and HO-1. Hence, leukemic cells performing OXPHOS, independently of de novo ROS production, generate an antioxidant response to protect themselves from ROS. Leukemic cells performing OXPHOS increase ROS and antioxidant gene expression. OXPHOS-mediated ERK5 activation induces miR-23 expression through MEF2. miR-23 blocks KEAP1 expression and increases antioxidant genes.
Cells performing oxidative phosphorylation (OXPHOS) generate reactive oxygen species (ROS) through mitochondrial activity. Excess ROS is deleterious to cells; hence they should be kept at bay. We show here that leukemic cells have a genetic program that allow them to generate an antioxidant response when performing OXPHOS and this is independent of ROS generation. Because leukemic cells need protection from ROS, this pathway is a potential target for therapeutic intervention.
Collapse
Affiliation(s)
- Abrar Ul Haq Khan
- INSERM, U1183; Université de Montpellier 1, UFR Medecine, 80, Av. Augustin Fliche, 34295 Montpellier Cedex 5, France
| | - Moeez G Rathore
- INSERM, U1183; Université de Montpellier 1, UFR Medecine, 80, Av. Augustin Fliche, 34295 Montpellier Cedex 5, France
| | - Nerea Allende-Vega
- INSERM, U1183; Université de Montpellier 1, UFR Medecine, 80, Av. Augustin Fliche, 34295 Montpellier Cedex 5, France
| | - Dang-Nghiem Vo
- INSERM, U1183; Université de Montpellier 1, UFR Medecine, 80, Av. Augustin Fliche, 34295 Montpellier Cedex 5, France
| | - Sana Belkhala
- INSERM, U1183; Université de Montpellier 1, UFR Medecine, 80, Av. Augustin Fliche, 34295 Montpellier Cedex 5, France
| | - Stefania Orecchioni
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | - Giovanna Talarico
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | - Francesco Bertolini
- Laboratory of Hematology-Oncology, European Institute of Oncology, Milan, Italy
| | - Guillaume Cartron
- Département d'Hématologie Clinique, CHU Montpellier, Université Montpellier I, 80 Av. Augustin Fliche, 34295 Montpellier, France
| | - Charles-Henri Lecellier
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, France; Institut de Biologie Computationnelle, University of Montpellier, France
| | - Martin Villalba
- INSERM, U1183; Université de Montpellier 1, UFR Medecine, 80, Av. Augustin Fliche, 34295 Montpellier Cedex 5, France; Institute of Regenerative Medicine and Biotherapy (IRMB), CHU Montpellier, Montpellier, 34295, France.
| |
Collapse
|
111
|
Carpentieri A, Cozzoli E, Scimeca M, Bonanno E, Sardanelli AM, Gambacurta A. Differentiation of human neuroblastoma cells toward the osteogenic lineage by mTOR inhibitor. Cell Death Dis 2015; 6:e1974. [PMID: 26561783 PMCID: PMC4670915 DOI: 10.1038/cddis.2015.244] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 07/23/2015] [Accepted: 07/28/2015] [Indexed: 12/14/2022]
Abstract
Current hypothesis suggest that tumors can originate from adult cells after a process of 'reprogramming' driven by genetic and epigenetic alterations. These cancer cells, called cancer stem cells (CSCs), are responsible for the tumor growth and metastases. To date, the research effort has been directed to the identification, isolation and manipulation of this cell population. Independently of whether tumors were triggered by a reprogramming of gene expression or seeded by stem cells, their energetic metabolism is altered compared with a normal cell, resulting in a high aerobic glycolytic 'Warburg' phenotype and dysregulation of mitochondrial activity. This metabolic alteration is intricately linked to cancer progression.The aim of this work has been to demonstrate the possibility of differentiating a neoplastic cell toward different germ layer lineages, by evaluating the morphological, metabolic and functional changes occurring in this process. The cellular differentiation reported in this study brings to different conclusions from those present in the current literature. We demonstrate that 'in vitro' neuroblastoma cancer cells (chosen as experimental model) are able to differentiate directly into osteoblastic (by rapamycin, an mTOR inhibitor) and hepatic lineage without an intermediate 'stem' cell step. This process seems owing to a synergy among few master molecules, metabolic changes and scaffold presence acting in a concerted way to control the cell fate.
Collapse
Affiliation(s)
- A Carpentieri
- Biochemistry Laboratory, Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome 00133, Italy
| | - E Cozzoli
- Biochemistry Laboratory, Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome 00133, Italy
| | - M Scimeca
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Rome 00133, Italy
| | - E Bonanno
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Rome 00133, Italy
| | - A M Sardanelli
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari 'Aldo Moro', Bari, Italy.,Center of Integrated Research, Campus Bio-Medico, University of Rome, Rome 00128, Italy
| | - A Gambacurta
- Biochemistry Laboratory, Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome 00133, Italy.,NAST Centre for Nanoscience, University of Rome 'Tor Vergata', Rome 00133, Italy
| |
Collapse
|
112
|
Santoro M, Guido C, De Amicis F, Sisci D, Cione E, Vincenza D, Donà A, Panno ML, Aquila S. Bergapten induces metabolic reprogramming in breast cancer cells. Oncol Rep 2015; 35:568-76. [PMID: 26459431 DOI: 10.3892/or.2015.4327] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 08/04/2015] [Indexed: 11/05/2022] Open
Abstract
Alterations in cellular metabolism are among the most consistent hallmarks of cancer. Herein, after a comprehensive metabolic phenotype characterization of MCF7 and ZR75 breast cancer cells, we investigated the activity of bergapten (Bg), a plant-derived compound, against breast cancer. The study of different biochemical pathways involved in cell metabolism revealed that the two cell lines have different bioenergetic phenotypes: MCF7 cells express a glycolytic phenotype only partially oxidative, while ZR75 cells mainly have an oxidative phenotype. In both cell lines, Bg blocked glycolysis and significantly decreased glucose-6-phosphate dehydrogenase (G6PDH) activity promoting glucose accumulation; modulated bioenergetic requirements altering the expression of oxidative phosphorylation (OXPHOS) complexes and ATP production; and induced a lipid-lowering effect since an increased lipase activity concomitantly to a reduction in triglyceride levels was observed. Quantitative data of different metabolites and enzymatic activities were presented. Treatment with Bg resulted in an alteration in different metabolic pathways inducing death in the cells. We report a novel action of the natural product Bg on breast cancer, since it induced metabolic reprogramming by disrupting the interconnected network of different metabolic mechanisms. Bg can be used in combination with other forms of targeted chemotherapy to improve cancer treatment outcomes.
Collapse
Affiliation(s)
- Marta Santoro
- Centro Sanitario, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Carmela Guido
- Centro Sanitario, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Francesca De Amicis
- Centro Sanitario, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Diego Sisci
- Centro Sanitario, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Erika Cione
- Department of Pharmacy and Science of Health and Nutrition, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Dolce Vincenza
- Department of Pharmacy and Science of Health and Nutrition, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Ada Donà
- Centro Sanitario, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Maria Luisa Panno
- Department of Pharmacy and Science of Health and Nutrition, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| | - Saveria Aquila
- Centro Sanitario, University of Calabria, I-87030 Arcavacata di Rende (CS), Italy
| |
Collapse
|
113
|
Plecitá-Hlavatá L, Ježek J, Ježek P. Aglycemia keeps mitochondrial oxidative phosphorylation under hypoxic conditions in HepG2 cells. J Bioenerg Biomembr 2015; 47:467-76. [DOI: 10.1007/s10863-015-9628-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 10/01/2015] [Indexed: 12/17/2022]
|
114
|
Lee M, Yoon JH. Metabolic interplay between glycolysis and mitochondrial oxidation: The reverse Warburg effect and its therapeutic implication. World J Biol Chem 2015; 6:148-61. [PMID: 26322173 PMCID: PMC4549759 DOI: 10.4331/wjbc.v6.i3.148] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Revised: 05/26/2015] [Accepted: 07/21/2015] [Indexed: 02/05/2023] Open
Abstract
Aerobic glycolysis, i.e., the Warburg effect, may contribute to the aggressive phenotype of hepatocellular carcinoma. However, increasing evidence highlights the limitations of the Warburg effect, such as high mitochondrial respiration and low glycolysis rates in cancer cells. To explain such contradictory phenomena with regard to the Warburg effect, a metabolic interplay between glycolytic and oxidative cells was proposed, i.e., the "reverse Warburg effect". Aerobic glycolysis may also occur in the stromal compartment that surrounds the tumor; thus, the stromal cells feed the cancer cells with lactate and this interaction prevents the creation of an acidic condition in the tumor microenvironment. This concept provides great heterogeneity in tumors, which makes the disease difficult to cure using a single agent. Understanding metabolic flexibility by lactate shuttles offers new perspectives to develop treatments that target the hypoxic tumor microenvironment and overcome the limitations of glycolytic inhibitors.
Collapse
|
115
|
Alvero AB, Montagna MK, Sumi NJ, Joo WD, Graham E, Mor G. Multiple blocks in the engagement of oxidative phosphorylation in putative ovarian cancer stem cells: implication for maintenance therapy with glycolysis inhibitors. Oncotarget 2015; 5:8703-15. [PMID: 25237928 PMCID: PMC4226715 DOI: 10.18632/oncotarget.2367] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Survival rate in ovarian cancer has not improved since chemotherapy was introduced a few decades ago. The dismal prognosis is mostly due to disease recurrence where majority of the patients succumb to the disease. The demonstration that tumors are comprised of subfractions of cancer cells displaying heterogeneity in stemness potential, chemoresistance, and tumor repair capacity suggests that recurrence may be driven by the chemoresistant cancer stem cells. Thus to improve patient survival, novel therapies should eradicate this cancer cell population. We show that in contrast to the more differentiated ovarian cancer cells, the putative CD44+/MyD88+ ovarian cancer stem cells express lower levels of pyruvate dehydrogenase, Cox–I, Cox-II, and Cox–IV, and higher levels of UCP2. Together, this molecular phenotype establishes a bioenergetic profile that prefers the use of glycolysis over oxidative phosphorylation to generate ATP. This bioenergetic profile is conserved in vivo and therefore a maintenance regimen of 2-deoxyglucose administered after Paclitaxel treatment is able to delay the progression of recurrent tumors and decrease tumor burden in mice. Our findings strongly suggest the value of maintenance with glycolysis inhibitors with the goal of improving survival in ovarian cancer patients.
Collapse
Affiliation(s)
- Ayesha B Alvero
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| | - Michele K Montagna
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| | - Natalia J Sumi
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| | - Won Duk Joo
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| | - Emma Graham
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| | - Gil Mor
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA
| |
Collapse
|
116
|
Smolková K, Dvořák A, Zelenka J, Vítek L, Ježek P. Reductive carboxylation and 2-hydroxyglutarate formation by wild-type IDH2 in breast carcinoma cells. Int J Biochem Cell Biol 2015; 65:125-33. [PMID: 26007236 DOI: 10.1016/j.biocel.2015.05.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 02/27/2015] [Accepted: 05/14/2015] [Indexed: 12/27/2022]
Abstract
Mitochondrial NADPH-dependent isocitrate dehydrogenase, IDH2, and cytosolic IDH1, catalyze reductive carboxylation of 2-oxoglutarate. Both idh2 and idh1 monoallelic mutations are harbored in grade 2/3 gliomas, secondary glioblastomas and acute myeloid leukemia. Mutant IDH1/IDH2 enzymes were reported to form an oncometabolite r-2-hydroxyglutarate (2HG), further strengthening malignancy. We quantified CO2-dependent reductive carboxylation glutaminolysis (RCG) and CO2-independent 2HG production in HTB-126 and MDA-MB-231 breast carcinoma cells by measuring (13)C incorporation from 1-(13)C-glutamine into citrate, malate, and 2HG. For HTB-126 cells, (13)C-citrate, (13)C-malate, and (13)C-2-hydroxyglutarate were enriched by 2-, 5-, and 15-fold at 5mM glucose (2-, 2.5-, and 13-fold at 25 mM glucose), respectively, after 6 h. Such enrichment decreased by 6% with IDH1 silencing, but by 30-50% upon IDH2 silencing while cell respiration and ATP levels rose up to 150%. Unlike 2HG production RCG declined at decreasing CO2. At hypoxia (5% O2), IDH2-related and unrelated (13)C-accumulation into citrate and malate increased 1.5-2.5-fold with unchanged IDH2 expression; whereas hypoxic 2HG formation did not. (13)C-2HG originated by ∼50% from other than IDH2 or IDH1 reactions, substantiating remaining activity in IDH1&2-silenced cells. Relatively high basal (12)C-2HG levels existed (5-fold higher vs. non-tumor HTB-125 cells) and (13)C-2HG was formed despite the absence of any idh2 and idh1 mutations in HTB-126 cells. Since RCG is enhanced at hypoxia (frequent in solid tumors) and 2HG can be formed without idh1/2 mutations, we suggest 2HG as an analytic marker (in serum, urine, or biopsies) predicting malignancy of breast cancer in all patients.
Collapse
Affiliation(s)
- Katarína Smolková
- Department of Membrane Transport Biophysics, No.75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| | - Aleš Dvořák
- Department of Membrane Transport Biophysics, No.75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic; Institute of Medical Biochemistry and Laboratory Diagnostics, Department of Internal Medicine, 1st Faculty of Medicine, Charles University in Prague, Prague, Czech Republic.
| | - Jaroslav Zelenka
- Department of Membrane Transport Biophysics, No.75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| | - Libor Vítek
- Institute of Medical Biochemistry and Laboratory Diagnostics, Department of Internal Medicine, 1st Faculty of Medicine, Charles University in Prague, Prague, Czech Republic.
| | - Petr Ježek
- Department of Membrane Transport Biophysics, No.75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| |
Collapse
|
117
|
How do changes in the mtDNA and mitochondrial dysfunction influence cancer and cancer therapy? Challenges, opportunities and models. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2015; 764:16-30. [DOI: 10.1016/j.mrrev.2015.01.001] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 01/11/2015] [Accepted: 01/12/2015] [Indexed: 12/28/2022]
|
118
|
Vidone M, Clima R, Santorsola M, Calabrese C, Girolimetti G, Kurelac I, Amato LB, Iommarini L, Trevisan E, Leone M, Soffietti R, Morra I, Faccani G, Attimonelli M, Porcelli AM, Gasparre G. A comprehensive characterization of mitochondrial DNA mutations in glioblastoma multiforme. Int J Biochem Cell Biol 2015; 63:46-54. [PMID: 25668474 DOI: 10.1016/j.biocel.2015.01.027] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 01/31/2015] [Indexed: 12/30/2022]
Abstract
Glioblastoma multiforme (GBM) is the most malignant brain cancer in adults, with a poor prognosis, whose molecular stratification still represents a challenge in pathology and clinics. On the other hand, mitochondrial DNA (mtDNA) mutations have been found in most tumors as modifiers of the bioenergetics state, albeit in GBM a characterization of the mtDNA status is lacking to date. Here, a characterization of the burden of mtDNA mutations in GBM samples was performed. First, investigation of tumor-specific vs. non tumor-specific mutations was carried out with the MToolBox bioinformatics pipeline by analyzing 45 matched tumor/blood samples, from whole genome or whole exome sequencing datasets obtained from The Cancer Genome Atlas (TCGA) consortium. Additionally, the entire mtDNA sequence was obtained in a dataset of 104 fresh-frozen GBM samples. Mitochondrial mutations with potential pathogenic interest were prioritized based on heteroplasmic fraction, nucleotide variability, and in silico prediction of pathogenicity. A preliminary biochemical analysis of the activity of mitochondrial respiratory complexes was also performed on fresh-frozen GBM samples. Although a high number of mutations was detected, we report that the large majority of them does not pass the prioritization filters. Therefore, a relatively limited burden of pathogenic mutations is indeed carried by GBM, which did not appear to determine a general impairment of the respiratory chain. This article is part of a Directed Issue entitled: Energy Metabolism Disorders and Therapies.
Collapse
Affiliation(s)
- Michele Vidone
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Rosanna Clima
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy; Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | | | - Claudia Calabrese
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Giulia Girolimetti
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Ivana Kurelac
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Laura Benedetta Amato
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy
| | - Luisa Iommarini
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Elisa Trevisan
- Division of Neurology, Hospital of Rivoli, Rivoli, Italy
| | - Marco Leone
- Department of Pathology OIRM-S. Anna Hospital, A.O.U. City of Health and Science, Turin, Italy
| | - Riccardo Soffietti
- Department of Neuro-Oncology, University and A.O.U. City of Health and Science, Turin, Italy
| | - Isabella Morra
- Department of Pathology OIRM-S. Anna Hospital, A.O.U. City of Health and Science, Turin, Italy
| | - Giuliano Faccani
- Department of Neurosurgery CTO Hospital, A.O.U. City of Health and Science, Turin, Italy
| | - Marcella Attimonelli
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Anna Maria Porcelli
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Giuseppe Gasparre
- Department of Medical and Surgical Sciences (DIMEC), Medical Genetics Unit, University of Bologna, Bologna, Italy.
| |
Collapse
|
119
|
Chandra V, Hong KM. Effects of deranged metabolism on epigenetic changes in cancer. Arch Pharm Res 2015; 38:321-37. [PMID: 25628247 DOI: 10.1007/s12272-015-0561-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 01/09/2015] [Indexed: 12/17/2022]
Abstract
The concept of epigenetics is now providing the mechanisms by which cells transfer their new environmental-change-induced phenotypes to their daughter cells. However, how extracellular or cytoplasmic environmental cues are connected to the nuclear epigenome remains incompletely understood. Recently emerging evidence suggests that epigenetic changes are correlated with metabolic changes via chromatin remodeling. As many human complex diseases including cancer harbor both epigenetic changes and metabolic dysregulation, understanding the molecular processes linking them has huge implications for disease pathogenesis and therapeutic intervention. In this review, the impacts of metabolic changes on cancer epigenetics are discussed, along with the current knowledge on cancer metabolism and epigenetics.
Collapse
Affiliation(s)
- Vishal Chandra
- Cancer Cell and Molecular Biology Branch, Research Institute, National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang, 410-769, Korea
| | | |
Collapse
|
120
|
Cormio A, Cormio G, Musicco C, Sardanelli AM, Gasparre G, Gadaleta MN. Mitochondrial changes in endometrial carcinoma: possible role in tumor diagnosis and prognosis (review). Oncol Rep 2014; 33:1011-8. [PMID: 25530491 DOI: 10.3892/or.2014.3690] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/21/2014] [Indexed: 11/05/2022] Open
Abstract
Endometrial carcinoma (EC) is a solid neoplasia for which a role for mitochondria in cancer progression is currently emerging and yet represents a diagnostic and prognostic challenge. EC is one of the most frequently occurring gynecological malignancies in the Western world whose incidence has increased significantly during the last decades. Here, we review the literature data on mitochondrial changes reported in EC, namely, mitochondrial DNA (mtDNA) mutations, increase in mitochondrial biogenesis and discuss whether they may be used as new cancer biomarkers for early detection and prognosis of this cancer.
Collapse
Affiliation(s)
- Antonella Cormio
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Gennaro Cormio
- Gynecologic Oncology Unit, IRCCS Istituto Oncologico 'Giovanni Paolo II', Bari, Italy
| | - Clara Musicco
- CNR-Institute of Biomembranes and Bioenergetics, Bari, Italy
| | - Anna Maria Sardanelli
- Department of Basical Medical Sciences, Neurosciences and Sensory Organs, University of Bari, Bari, Italy
| | - Giuseppe Gasparre
- Department of Medical and Surgical Sciences, Unit of Medical Genetics, University of Bologna, Bologna, Italy
| | | |
Collapse
|
121
|
Abstract
Chronic inflammation predisposes tissue to cancer development. Individuals afflicted with inflammatory bowel diseases are at an increased risk of developing colorectal cancer depending on disease severity, duration, and management. The intestinal epithelium exhibits mitochondrial dysfunction during colitis and colitis-associated cancer. Signal Transducer and Activator of Transcription (Stat)-3 is a transcription factor involved in growth-promoting and antiapoptotic signaling pathways. In addition to its activities as a transcription factor, Stat3 resides in the mitochondria of cells where it is required for optimal electron transport chain activity and protects against stress-induced mitochondrial dysfunction. The function of mitochondrial Stat3 is not completely understood; dichotomous roles include protecting against cellular injury but also supporting malignant transformation. This review discusses the roles of Stat3 in the regulation of intestinal epithelial cell fate during colitis and colorectal cancer with an emphasis on mitochondrial dysfunction and the potential involvement of mitochondrial Stat3 during disease progression.
Collapse
|
122
|
Maya-Mendoza A, Ostrakova J, Kosar M, Hall A, Duskova P, Mistrik M, Merchut-Maya JM, Hodny Z, Bartkova J, Christensen C, Bartek J. Myc and Ras oncogenes engage different energy metabolism programs and evoke distinct patterns of oxidative and DNA replication stress. Mol Oncol 2014; 9:601-16. [PMID: 25435281 PMCID: PMC5528704 DOI: 10.1016/j.molonc.2014.11.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 11/03/2014] [Accepted: 11/05/2014] [Indexed: 10/28/2022] Open
Abstract
Both Myc and Ras oncogenes impact cellular metabolism, deregulate redox homeostasis and trigger DNA replication stress (RS) that compromises genomic integrity. However, how are such oncogene-induced effects evoked and temporally related, to what extent are these kinetic parameters shared by Myc and Ras, and how are these cellular changes linked with oncogene-induced cellular senescence in different cell context(s) remain poorly understood. Here, we addressed the above-mentioned open questions by multifaceted comparative analyses of human cellular models with inducible expression of c-Myc and H-RasV12 (Ras), two commonly deregulated oncoproteins operating in a functionally connected signaling network. Our study of DNA replication parameters using the DNA fiber approach and time-course assessment of perturbations in glycolytic flux, oxygen consumption and production of reactive oxygen species (ROS) revealed the following results. First, overabundance of nuclear Myc triggered RS promptly, already after one day of Myc induction, causing slow replication fork progression and fork asymmetry, even before any metabolic changes occurred. In contrast, Ras overexpression initially induced a burst of cell proliferation and increased the speed of replication fork progression. However, after several days of induction Ras caused bioenergetic metabolic changes that correlated with slower DNA replication fork progression and the ensuing cell cycle arrest, gradually leading to senescence. Second, the observed oncogene-induced RS and metabolic alterations were cell-type/context dependent, as shown by comparative analyses of normal human BJ fibroblasts versus U2-OS sarcoma cells. Third, the energy metabolic reprogramming triggered by Ras was more robust compared to impact of Myc. Fourth, the detected oncogene-induced oxidative stress was due to ROS (superoxide) of non-mitochondrial origin and mitochondrial OXPHOS was reduced (Crabtree effect). Overall, our study provides novel insights into oncogene-evoked metabolic reprogramming, replication and oxidative stress, with implications for mechanisms of tumorigenesis and potential targeting of oncogene addiction.
Collapse
Affiliation(s)
| | - Jitka Ostrakova
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark
| | - Martin Kosar
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark; Department of Genome Integrity, Institute of Molecular Genetics, v.v.i., Academy of Sciences of the Czech Republic, CZ-142 20 Prague, Czech Republic
| | - Arnaldur Hall
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark
| | - Pavlina Duskova
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-775 15 Olomouc, Czech Republic
| | - Martin Mistrik
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-775 15 Olomouc, Czech Republic
| | | | - Zdenek Hodny
- Department of Genome Integrity, Institute of Molecular Genetics, v.v.i., Academy of Sciences of the Czech Republic, CZ-142 20 Prague, Czech Republic
| | - Jirina Bartkova
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark
| | | | - Jiri Bartek
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark; Department of Genome Integrity, Institute of Molecular Genetics, v.v.i., Academy of Sciences of the Czech Republic, CZ-142 20 Prague, Czech Republic; Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-775 15 Olomouc, Czech Republic.
| |
Collapse
|
123
|
Villalba M, Lopez-Royuela N, Krzywinska E, Rathore MG, Hipskind RA, Haouas H, Allende-Vega N. Chemical metabolic inhibitors for the treatment of blood-borne cancers. Anticancer Agents Med Chem 2014; 14:223-32. [PMID: 24237221 DOI: 10.2174/18715206113136660374] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 03/20/2013] [Accepted: 10/07/2013] [Indexed: 12/16/2022]
Abstract
Tumor cells, including leukemic cells, remodel their bioenergetic system in favor of aerobic glycolysis. This process is called "the Warburg effect" and offers an attractive pharmacological target to preferentially eliminate malignant cells. In addition, recent results show that metabolic changes can be linked to tumor immune evasion. Mouse models demonstrate the importance of this metabolic remodeling in leukemogenesis. Some leukemias, although treatable, remain incurable and resistance to chemotherapy produces an elevated percentage of relapse in most leukemia cases. Several groups have targeted the specific metabolism of leukemia cells in preclinical and clinical studies to improve the prognosis of these patients, i.e. using L-asparaginase to treat pediatric acute lymphocytic leukemia (ALL). Additional metabolic drugs that are currently being used to treat other diseases or tumors could also be exploited for leukemia, based on preclinical studies. Finally, we discuss the potential use of several metabolic drugs in combination therapies, including immunomodulatory drugs (IMiDs) or immune cell-based therapies, to increase their efficacy and reduce side effects in the treatment of hematological cancers.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Nerea Allende-Vega
- INSERM U1040, Institut de Recherche en Biothérapie, 80, avenue Augustin Fliche. 34295 Montpellier Cedex 5, France.
| |
Collapse
|
124
|
Hjerpe E, Brage SE, Frostvik Stolt M, Johansson H, Shoshan M, Avall-Lundqvist E. Metabolic markers and HSP60 in chemonaive serous solid ovarian cancer versus ascites. Int J Gynecol Cancer 2014; 24:1389-94. [PMID: 25188891 DOI: 10.1097/igc.0000000000000246] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVE Metabolic pathway alterations in cancer are thought to be dependent upon tumor type-specific oncogenic activation and local nutrient and oxygen supply during disease progression. In serous ovarian cancer, the typical peritoneal spread of disease is caused by shedding of tumor cells into the abdominal cavity, often along with ascites formation. Not much is known about the metabolic features of these detached serous tumor cells. In this study, we investigate the messenger RNA (mRNA) expression of GAPDH (glycolytic glyceraldehyde 3-phosphate dehydrogenase) and PKM2 (pyruvate kinase isoform M2), ATP5B (mitochondrial β-F1-ATPase), and heat shock protein 60 in matched serous solid tumor and corresponding ascites. MATERIALS/METHODS Fresh samples from solid tumor and corresponding ascites were prospectively collected from 40 patients undergoing primary surgery for suspected advanced ovarian cancer. Of these, 25 met the study eligibility criteria, that is, stage IIC to IV disease of the serous (24) or endometrioid (1) subtype with solid and ascites specimens containing 50% or more tumor cells and with good quality and quantity mRNA yield. All but 2 patients (92%) had type II disease. GAPDH, PKM2, ATP5B, and HSP60 mRNA expressions were assessed by real-time polymerase chain reaction. For each marker, the mRNA expression in solid tumor was pairwise compared with the corresponding expression in ascites using the Wilcoxon matched pairs signed rank sum test. RESULTS In contrast to our hypothesis, the mRNA expression of analyzed metabolic markers and HSP60 did not significantly differ between matched solid tumor and malignant ascites. CONCLUSIONS Our results indicate that further expression changes in genes related to glycolysis or oxidative phosphorylation are not a prerequisite for serous cancer cell survival after detachment.
Collapse
Affiliation(s)
- Elisabet Hjerpe
- *Department of Oncology and Pathology, and †Department of Oncologyand Pathology, Cancer Center Karolinska CCK R8:03, Karolinska Institutet, Stockholm, Sweden
| | | | | | | | | | | |
Collapse
|
125
|
Lopez-Royuela N, Rathore MG, Allende-Vega N, Annicotte JS, Fajas L, Ramachandran B, Gulick T, Villalba M. Extracellular-signal-regulated kinase 5 modulates the antioxidant response by transcriptionally controlling Sirtuin 1 expression in leukemic cells. Int J Biochem Cell Biol 2014; 53:253-61. [DOI: 10.1016/j.biocel.2014.05.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 04/17/2014] [Accepted: 05/19/2014] [Indexed: 01/15/2023]
|
126
|
TRIM24 links glucose metabolism with transformation of human mammary epithelial cells. Oncogene 2014; 34:2836-45. [PMID: 25065590 DOI: 10.1038/onc.2014.220] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 05/08/2014] [Accepted: 06/02/2014] [Indexed: 12/12/2022]
Abstract
Tripartite motif 24 protein (TRIM24) is a plant homeodomain/bromodomain histone reader, recently associated with poor overall survival of breast-cancer patients. At a molecular level, TRIM24 is a negative regulator of p53 levels and a co-activator of estrogen receptor. However, the role of TRIM24 in breast tumorigenesis remains largely unknown. We used an isogenic human mammary epithelial cell (HMEC) culture model, derived from reduction mammoplasty tissue, and found that ectopic expression of TRIM24 in immortalized HMECs (TRIM24 iHMECs) greatly increased cellular proliferation and induced malignant transformation. Subcutaneous injection of TRIM24 iHMECs in nude mice led to growth of intermediate to high-grade tumors in 60-70% of mice. Molecular analysis of TRIM24 iHMECs revealed a glycolytic and tricarboxylic acid cycle gene signature, alongside increased glucose uptake and activated aerobic glycolysis. Collectively, these results identify a role for TRIM24 in breast tumorigenesis through reprogramming of glucose metabolism in HMECs, further supporting TRIM24 as a viable therapeutic target in breast cancer.
Collapse
|
127
|
Li S, Zhou T, Li C, Dai Z, Che D, Yao Y, Li L, Ma J, Yang X, Gao G. High metastaticgastric and breast cancer cells consume oleic acid in an AMPK dependent manner. PLoS One 2014; 9:e97330. [PMID: 24823908 PMCID: PMC4019637 DOI: 10.1371/journal.pone.0097330] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 04/19/2014] [Indexed: 12/21/2022] Open
Abstract
Gastric cancer and breast cancer have a clear tendency toward metastasis and invasion to the microenvironment predominantly composed of adipocytes. Oleic acid is an abundant monounsaturated fatty acid that releases from adipocytes and impinges on different energy metabolism responses. The effect and underlying mechanisms of oleic acid on highly metastatic cancer cells are not completely understood. We reported that AMP-activated protein kinase (AMPK) was obviously activated in highly aggressive carcinoma cell lines treated by oleic acid, including gastric carcinoma HGC-27 and breast carcinoma MDA-MB-231 cell lines. AMPK enhanced the rates of fatty acid oxidation and ATP production and thus significantly promoted cancer growth and migration under serum deprivation. Inactivation of AMPK attenuated these activities of oleic acid. Oleic acid inhibited cancer cell growth and survival in low metastatic carcinoma cells, such as gastric carcinoma SGC7901 and breast carcinoma MCF-7 cell lines. Pharmacological activation of AMPK rescued the cell viability by maintained ATP levels by increasing fatty acid β-oxidation. These results indicate that highly metastatic carcinoma cells could consume oleic acid to maintain malignancy in an AMPK-dependent manner. Our findings demonstrate the important contribution of fatty acid oxidation to cancer cell function.
Collapse
Affiliation(s)
- Shuai Li
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Ti Zhou
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Cen Li
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Zhiyu Dai
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Di Che
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Yachao Yao
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Lei Li
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
| | - Jianxing Ma
- Department of Physiology, University of Oklahoma, Health Sciences Center, Oklahoma City, Oklahoma, United States of America
| | - Xia Yang
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
- Key Laboratory of Functional Molecules from Marine Microorganisms (Sun Yat-sen University), Department of Education of Guangdong Province, Guangzhou, China
- * E-mail: (GG); (XY)
| | - Guoquan Gao
- Department of Biochemistry, Zhongshan School of Medicine, SunYat-sen University, Guangzhou, China
- China Key Laboratory of Tropical Disease Control (SunYat-sen University), Ministry of Education, Guangzhou, China
- * E-mail: (GG); (XY)
| |
Collapse
|
128
|
Vetvik KK, Sonerud T, Lindeberg M, Lüders T, Størkson RH, Jonsdottir K, Frengen E, Pietiläinen KH, Bukholm I. Globular adiponectin and its downstream target genes are up-regulated locally in human colorectal tumors: ex vivo and in vitro studies. Metabolism 2014; 63:672-81. [PMID: 24636346 DOI: 10.1016/j.metabol.2014.02.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 01/26/2014] [Accepted: 02/03/2014] [Indexed: 01/12/2023]
Abstract
OBJECTIVE Low plasma adiponectin levels are linked to obesity, insulin resistance, and the risk of several types of malignancy. Despite the decline in circulating adiponectin concentrations, the increase in the expression of adiponectin receptors AdipoR1 and AdipoR2 is greater in cancerous than in normal colonic tissue. The purpose of this study was to obtain new information regarding local adiponectin signaling in the pathogenesis of colorectal cancer (CRC). METHODS We characterized the expressions of adiponectin and several of its downstream targets in paired samples of tumor tissue and adjacent noncancerous mucosa in 60 surgical patients with colorectal adenocarcinomas. RESULTS Adiponectin was expressed in both colorectal tumors and the adjacent mucosa. The expressions of adiponectin mRNA and its globular protein variant (gAd), adiponectin receptor type 1 and 5' AMP-activated protein kinase (AMPK) mRNA were significantly higher in colorectal tumors than in the adjacent mucosa. This finding was accompanied by increased mRNA expression of genes encoding proteins involved in fatty-acid trafficking and oxidation. The potential interference between adiponectin stimulation and AMPK activation through AMPK1 was examined in an in vitro model with the aid of silencing-RNA experiments. Furthermore, AMPK mRNA expression on tumors was positively correlated with a more advanced tumor stage in the patients. CONCLUSION We propose that the globular adiponectin-AMPK pathway functions in an autocrine manner in colorectal tumors, explaining some of the beneficial changes in cellular oxidative capacity in tumors in favor of tumorigenesis.
Collapse
Affiliation(s)
- Katja Kannisto Vetvik
- Department of Clinical Molecular Biology and Laboratory Sciences (EpiGen), Institute for Clinical Medicine, University of Oslo, Norway; Surgical Department, Akershus University Hospital, Lørenskog, Norway.
| | - Tonje Sonerud
- Department of Clinical Molecular Biology and Laboratory Sciences (EpiGen), Institute for Clinical Medicine, University of Oslo, Norway
| | - Mona Lindeberg
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway; Department of Medical Genetics, University of Oslo, Norway
| | - Torben Lüders
- Department of Clinical Molecular Biology and Laboratory Sciences (EpiGen), Institute for Clinical Medicine, University of Oslo, Norway
| | - Ragnhild H Størkson
- Department of Clinical Molecular Biology and Laboratory Sciences (EpiGen), Institute for Clinical Medicine, University of Oslo, Norway; Surgical Department, Østfold Hospital Trust, Fredrikstad, Norway
| | - Kristin Jonsdottir
- Department of Clinical Molecular Biology and Laboratory Sciences (EpiGen), Institute for Clinical Medicine, University of Oslo, Norway
| | - Eirik Frengen
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway; Department of Medical Genetics, University of Oslo, Norway
| | - Kirsi H Pietiläinen
- Obesity Research Unit, Department of Medicine, Division of Endocrinology, Helsinki University Central Hospital and University of Helsinki, Finland; Institute of Molecular Medicine Finland, FIMM, University of Helsinki, Helsinki, Finland
| | - Ida Bukholm
- Department of Clinical Molecular Biology and Laboratory Sciences (EpiGen), Institute for Clinical Medicine, University of Oslo, Norway; Surgical Department, Akershus University Hospital, Lørenskog, Norway; Institute of Health Promotion, Akershus University Hospital, Lørenskog, Norway
| |
Collapse
|
129
|
The role of mitochondrial electron transport in tumorigenesis and metastasis. Biochim Biophys Acta Gen Subj 2014; 1840:1454-63. [DOI: 10.1016/j.bbagen.2013.10.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 09/20/2013] [Accepted: 10/10/2013] [Indexed: 12/11/2022]
|
130
|
JEŽEK P, OLEJÁR T, SMOLKOVÁ K, JEŽEK J, DLASKOVÁ A, PLECITÁ-HLAVATÁ L, ZELENKA J, ŠPAČEK T, ENGSTOVÁ H, PAJUELO REGUERA D, JABŮREK M. Antioxidant and Regulatory Role of Mitochondrial Uncoupling Protein UCP2 in Pancreatic β-cells. Physiol Res 2014; 63:S73-91. [DOI: 10.33549/physiolres.932633] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Research on brown adipose tissue and its hallmark protein, mitochondrial uncoupling protein UCP1, has been conducted for half a century and has been traditionally studied in the Institute of Physiology (AS CR, Prague), likewise UCP2 residing in multiple tissues for the last two decades. Our group has significantly contributed to the elucidation of UCP uncoupling mechanism, fully dependent on free fatty acids (FFAs) within the inner mitochondrial membrane. Now we review UCP2 physiological roles emphasizing its roles in pancreatic β-cells, such as antioxidant role, possible tuning of redox homeostasis (consequently UCP2 participation in redox regulations), and fine regulation of glucose-stimulated insulin secretion (GSIS). For example, NADPH has been firmly established as being a modulator of GSIS and since UCP2 may influence redox homeostasis, it likely affects NADPH levels. We also point out the role of phospholipase iPLA2 isoform in providing FFAs for the UCP2 antioxidant function. Such initiation of mild uncoupling hypothetically precedes lipotoxicity in pancreatic β-cells until it reaches the pathological threshold, after which the antioxidant role of UCP2 can be no more cell-protective, for example due to oxidative stress-accumulated mutations in mtDNA. These mechanisms, together with impaired autocrine insulin function belong to important causes of Type 2 diabetes etiology.
Collapse
Affiliation(s)
- P. JEŽEK
- Department of Membrane Transport Biophysics, Institute of Physiology Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
131
|
Risques RA, Ussakli C, Salk JJ, Rabinovitch PS, Brentnall TA. Response. J Natl Cancer Inst 2014; 106:djt437. [PMID: 24402500 DOI: 10.1093/jnci/djt437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Rosa Ana Risques
- Affiliations of authors: Department of Pathology (RAR, CU, JJS, PSR), Department of Medicine (JJS, TAB), and Division of Gastroenterology (TAB), University of Washington, Seattle, WA; Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA (PSR)
| | | | | | | | | |
Collapse
|
132
|
|
133
|
|
134
|
Dysfunctional oxidative phosphorylation makes malignant melanoma cells addicted to glycolysis driven by the (V600E)BRAF oncogene. Oncotarget 2013; 4:584-99. [PMID: 23603840 PMCID: PMC3720606 DOI: 10.18632/oncotarget.965] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Oncogene addiction describes how cancer cells exhibit dependence on single oncogenes to escape apoptosis and senescence. While oncogene addiction constitutes the basis for new cancer treatment strategies targeting individual kinases and pathways activated by oncogenic mutations, the biochemical basis for this addiction is largely unknown. Here we provide evidence for a metabolic rationale behind the addiction to V600EBRAF in two malignant melanoma cell lines. Both cell lines display a striking addiction to glycolysis due to underlying dysfunction of oxidative phosphorylation (OXPHOS). Notably, even minor reductions in glycolytic activity lead to increased OXPHOS activity (reversed Warburg effect), however the mitochondria are unable to sustain ATP production. We show that V600EBRAF upholds the activity of glycolysis and therefore the addiction to glycolysis de facto becomes an addiction to V600EBRAF. Finally, the senescence response associated with inhibition of V600EBRAF is rescued by overexpression of glyceraldehyde-3-phosphate dehydrogenase (GAPDH), providing direct evidence that oncogene addiction rests on a metabolic foundation.
Collapse
|
135
|
Sanli T, Steinberg GR, Singh G, Tsakiridis T. AMP-activated protein kinase (AMPK) beyond metabolism: a novel genomic stress sensor participating in the DNA damage response pathway. Cancer Biol Ther 2013; 15:156-69. [PMID: 24100703 DOI: 10.4161/cbt.26726] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
AMP-activated protein kinase (AMPK), an established metabolic stress sensor, has gained popularity in cancer biology due to its ability to control cellular growth and mediate cell cycle checkpoints in cancer cells in response to low energy levels. AMPK is a key effector of the tumor suppressor liver kinase B 1 (LKB1) which inhibits the cellular growth mediator mammalian target of rapamycin (mTOR) and activates checkpoint mediators such as p53 and the cyclin dependent kinase inhibitors p21(cip1) and p27(kip1). However, recent work describes a novel function for AMPK as a sensor of genomic stress and a participant of the DNA damage response (DDR) pathway. Ionizing radiation and chemotherapy activate AMPK in cancer cells to mediate signal transduction downstream of ataxia telangiectasia mutated (ATM) to activate p53- p21(cip1)/p27(kip1) and inhibit mTOR. We discuss evidence on the transcriptional and post-translational regulation of AMPK by ionizing radiation and the role of the enzyme as a mediator of chemo- and radiation sensitivity in epithelial cancer cells. Furthermore, we review data on the participation of AMPK in cytokinesis and observations suggesting a physical association of this enzyme with the mitotic apparatus. The evidence available to date suggests that AMPK is a point of convergence of metabolic and genomic stress signals, which (1) control the activity of growth mediators, (2) propagate DDR, and (3) mediate the anti-proliferative effects of common cytotoxic cancer therapy such as radiation and chemotherapy. This highlights the importance of targeting AMPK with novel cancer therapeutics.
Collapse
Affiliation(s)
- Toran Sanli
- Translational Radiation Biology Laboratory; Juravinski Cancer Center; Hamilton, ON Canada; Department of Oncology; McMaster University; Hamilton, ON Canada
| | | | - Gurmit Singh
- Department of Pathology and Molecular Medicine; McMaster University; Hamilton, ON Canada
| | - Theodoros Tsakiridis
- Translational Radiation Biology Laboratory; Juravinski Cancer Center; Hamilton, ON Canada; Department of Oncology; McMaster University; Hamilton, ON Canada
| |
Collapse
|
136
|
Tumor cell death induced by the inhibition of mitochondrial electron transport: The effect of 3-hydroxybakuchiol. Toxicol Appl Pharmacol 2013; 272:356-64. [DOI: 10.1016/j.taap.2013.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/29/2013] [Accepted: 06/07/2013] [Indexed: 12/14/2022]
|
137
|
Sandén C, Ageberg M, Petersson J, Lennartsson A, Gullberg U. Forced expression of the DEK-NUP214 fusion protein promotes proliferation dependent on upregulation of mTOR. BMC Cancer 2013; 13:440. [PMID: 24073922 PMCID: PMC3849736 DOI: 10.1186/1471-2407-13-440] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 09/25/2013] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND The t(6;9)(p23;q34) chromosomal translocation is found in 1% of acute myeloid leukemia and encodes the fusion protein DEK-NUP214 (formerly DEK-CAN) with largely uncharacterized functions. METHODS We expressed DEK-NUP214 in the myeloid cell lines U937 and PL-21 and studied the effects on cellular functions. RESULTS In this study, we demonstrate that expression of DEK-NUP214 increases cellular proliferation. Western blot analysis revealed elevated levels of one of the key proteins regulating proliferation, the mechanistic target of rapamycin, mTOR. This conferred increased mTORC1 but not mTORC2 activity, as determined by the phosphorylation of their substrates, p70 S6 kinase and Akt. The functional importance of the mTOR upregulation was determined by assaying the downstream cellular processes; protein synthesis and glucose metabolism. A global translation assay revealed a substantial increase in the translation rate and a metabolic assay detected a shift from glycolysis to oxidative phosphorylation, as determined by a reduction in lactate production without a concomitant decrease in glucose consumption. Both these effects are in concordance with increased mTORC1 activity. Treatment with the mTORC1 inhibitor everolimus (RAD001) selectively reversed the DEK-NUP214-induced proliferation, demonstrating that the effect is mTOR-dependent. CONCLUSIONS Our study shows that the DEK-NUP214 fusion gene increases proliferation by upregulation of mTOR, suggesting that patients with leukemias carrying DEK-NUP214 may benefit from treatment with mTOR inhibitors.
Collapse
Affiliation(s)
- Carl Sandén
- Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Malin Ageberg
- Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Jessica Petersson
- Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| | - Andreas Lennartsson
- Center for Biosciences, Department of Biosciences and Medical Nutrition, Karolinska Institute, Novum 141 83, Huddinge, Sweden
| | - Urban Gullberg
- Department of Hematology, Lund University, BMC B13, Klinikgatan 26, 221 84 Lund, Sweden
| |
Collapse
|
138
|
Yehuda-Shnaidman E, Nimri L, Tarnovscki T, Kirshtein B, Rudich A, Schwartz B. Secreted human adipose leptin decreases mitochondrial respiration in HCT116 colon cancer cells. PLoS One 2013; 8:e74843. [PMID: 24073224 PMCID: PMC3779244 DOI: 10.1371/journal.pone.0074843] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Accepted: 08/08/2013] [Indexed: 12/20/2022] Open
Abstract
Obesity is a key risk factor for the development of colon cancer; however, the endocrine/paracrine/metabolic networks mediating this connection are poorly understood. Here we hypothesize that obesity results in secreted products from adipose tissue that induce malignancy-related metabolic alterations in colon cancer cells. Human HCT116 colon cancer cells, were exposed to conditioned media from cultured human adipose tissue fragments of obese vs. non-obese subjects. Oxygen consumption rate (OCR, mostly mitochondrial respiration) and extracellular acidification rate (ECAR, mostly lactate production via glycolysis) were examined vis-à-vis cell viability and expression of related genes and proteins. Our results show that conditioned media from obese (vs. non-obese) subjects decreased basal (40%, p<0.05) and maximal (50%, p<0.05) OCR and gene expression of mitochondrial proteins and Bax without affecting cell viability or expression of glycolytic enzymes. Similar changes could be recapitulated by incubating cells with leptin, whereas, leptin-receptor specific antagonist inhibited the reduced OCR induced by conditioned media from obese subjects. We conclude that secreted products from the adipose tissue of obese subjects inhibit mitochondrial respiration and function in HCT116 colon cancer cells, an effect that is at least partly mediated by leptin. These results highlight a putative novel mechanism for obesity-associated risk of gastrointestinal malignancies, and suggest potential new therapeutic avenues.
Collapse
Affiliation(s)
- Einav Yehuda-Shnaidman
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, the Hebrew University of Jerusalem, Rehovot, Israel
- * E-mail: ; (BS)
| | - Lili Nimri
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, the Hebrew University of Jerusalem, Rehovot, Israel
| | - Tanya Tarnovscki
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be’er-Sheva, Israel
| | - Boris Kirshtein
- Department of Surgery A, Soroka Academic Medical Center, Be’er-Sheva, Israel
| | - Assaf Rudich
- Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be’er-Sheva, Israel
| | - Betty Schwartz
- Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, the Hebrew University of Jerusalem, Rehovot, Israel
- * E-mail: ; (BS)
| |
Collapse
|
139
|
Policastro LL, Ibañez IL, Notcovich C, Duran HA, Podhajcer OL. The tumor microenvironment: characterization, redox considerations, and novel approaches for reactive oxygen species-targeted gene therapy. Antioxid Redox Signal 2013; 19:854-95. [PMID: 22794113 DOI: 10.1089/ars.2011.4367] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The tumor microenvironment is a complex system that involves the interaction between malignant and neighbor stromal cells embedded in a mesh of extracellular matrix (ECM) components. Stromal cells (fibroblasts, endothelial, and inflammatory cells) are co-opted at different stages to help malignant cells invade the surrounding ECM and disseminate. Malignant cells have developed adaptive mechanisms to survive under the extreme conditions of the tumor microenvironment such as restricted oxygen supply (hypoxia), nutrient deprivation, and a prooxidant state among others. These conditions could be eventually used to target drugs that will be activated specifically in this microenvironment. Preclinical studies have shown that modulating cellular/tissue redox state by different gene therapy (GT) approaches was able to control tumor growth. In this review, we describe the most relevant features of the tumor microenvironment, addressing reactive oxygen species-generating sources that promote a prooxidative microenvironment inside the tumor mass. We describe different GT approaches that promote either a decreased or exacerbated prooxidative microenvironment, and those that make use of the differential levels of ROS between cancer and normal cells to achieve tumor growth inhibition.
Collapse
Affiliation(s)
- Lucia Laura Policastro
- Department of Micro and Nanotechnology, National Atomic Energy Commission, Buenos Aires 1650, Argentina.
| | | | | | | | | |
Collapse
|
140
|
Krasnov GS, Dmitriev AA, Lakunina VA, Kirpiy AA, Kudryavtseva AV. Targeting VDAC-bound hexokinase II: a promising approach for concomitant anti-cancer therapy. Expert Opin Ther Targets 2013; 17:1221-33. [DOI: 10.1517/14728222.2013.833607] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
141
|
Ussakli CH, Ebaee A, Binkley J, Brentnall TA, Emond MJ, Rabinovitch PS, Risques RA. Mitochondria and tumor progression in ulcerative colitis. J Natl Cancer Inst 2013; 105:1239-48. [PMID: 23852949 DOI: 10.1093/jnci/djt167] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The role of mitochondria in cancer is poorly understood. Ulcerative colitis (UC) is an inflammatory bowel disease that predisposes to colorectal cancer and is an excellent model to study tumor progression. Our goal was to characterize mitochondrial alterations in UC tumorigenesis. METHODS Nondysplastic colon biopsies from UC patients with high-grade dysplasia or cancer (progressors; n = 9) and UC patients dysplasia free (nonprogressors; n = 9) were immunostained for cytochrome C oxidase (COX), a component of the electron transport chain, and were quantified by multispectral imaging. For six additional progressors, nondysplastic and dysplastic biopsies were stained for COX and additional mitochondrial proteins including PGC1α, the master regulator of mitochondrial biogenesis. Mitochondrial DNA (mtDNA) copy number was determined by quantitative polymerase chain reaction. Generalized estimating equations with two-sided tests were used to account for correlation of measurements within individuals. RESULTS Nondysplastic biopsies of UC progressors showed statistically significant COX loss compared with UC nonprogressors by generalized estimating equation (-18.5 units, 95% confidence interval = -12.1 to -24.9; P < .001). COX intensity progressively decreased with proximity to dysplasia and was the lowest in adjacent to dysplasia and dysplastic epithelium. Surprisingly, COX intensity was statistically significantly increased in cancers. This bimodal pattern was observed for other mitochondrial proteins, including PGC1α, and was confirmed by mtDNA copy number. CONCLUSIONS Mitochondrial loss precedes the development of dysplasia, and it could be used to detect and potentially predict cancer. Cancer cells restore mitochondria, suggesting that mitochondria are needed for further proliferation. This bimodal pattern might be driven by transcriptional regulation of mitochondrial biogenesis by PGC1α.
Collapse
|
142
|
Eisenreich W, Heesemann J, Rudel T, Goebel W. Metabolic host responses to infection by intracellular bacterial pathogens. Front Cell Infect Microbiol 2013; 3:24. [PMID: 23847769 PMCID: PMC3705551 DOI: 10.3389/fcimb.2013.00024] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 06/11/2013] [Indexed: 12/12/2022] Open
Abstract
The interaction of bacterial pathogens with mammalian hosts leads to a variety of physiological responses of the interacting partners aimed at an adaptation to the new situation. These responses include multiple metabolic changes in the affected host cells which are most obvious when the pathogen replicates within host cells as in case of intracellular bacterial pathogens. While the pathogen tries to deprive nutrients from the host cell, the host cell in return takes various metabolic countermeasures against the nutrient theft. During this conflicting interaction, the pathogen triggers metabolic host cell responses by means of common cell envelope components and specific virulence-associated factors. These host reactions generally promote replication of the pathogen. There is growing evidence that pathogen-specific factors may interfere in different ways with the complex regulatory network that controls the carbon and nitrogen metabolism of mammalian cells. The host cell defense answers include general metabolic reactions, like the generation of oxygen- and/or nitrogen-reactive species, and more specific measures aimed to prevent access to essential nutrients for the respective pathogen. Accurate results on metabolic host cell responses are often hampered by the use of cancer cell lines that already exhibit various de-regulated reactions in the primary carbon metabolism. Hence, there is an urgent need for cellular models that more closely reflect the in vivo infection conditions. The exact knowledge of the metabolic host cell responses may provide new interesting concepts for antibacterial therapies.
Collapse
Affiliation(s)
- Wolfgang Eisenreich
- Lehrstuhl für Biochemie, Center of Isotopologue Profiling, Technische Universität München Garching, Germany
| | | | | | | |
Collapse
|
143
|
Peitzsch C, Kurth I, Kunz-Schughart L, Baumann M, Dubrovska A. Discovery of the cancer stem cell related determinants of radioresistance. Radiother Oncol 2013; 108:378-87. [PMID: 23830195 DOI: 10.1016/j.radonc.2013.06.003] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 05/31/2013] [Accepted: 06/05/2013] [Indexed: 12/23/2022]
Abstract
Tumors are known to be heterogeneous containing a dynamic mixture of phenotypically and functionally different tumor cells. The two concepts attempting to explain the origin of intratumor heterogeneity are the cancer stem cell hypothesis and the clonal evolution model. The stochastic model argues that tumors are biologically homogenous and all cancer cells within the tumor have equal ability to propagate the tumor growth depending on continuing mutations and selective pressure. By contrast, the stem cells model suggests that cancer heterogeneity is due to the hierarchy that originates from a small population of cancer stem cells (CSCs) which are biologically distinct from the bulk tumor and possesses self-renewal, tumorigenic and multilineage potential. Although these two hypotheses have been discussed for a long time as mutually exclusive explanations of tumor heterogeneity, they are easily reconciled serving as a driving force of cancer evolution and diversity. Recent discovery of the cancer cell plasticity and heterogeneity makes the CSC population a moving target that could be hard to track and eradicate. Understanding the signaling mechanisms regulating CSCs during the course of cancer treatment can be indispensable for the optimization of current treatment strategies.
Collapse
Affiliation(s)
- Claudia Peitzsch
- OncoRay National Center for Radiation Research in Oncology, University Hospital/Medical Faculty Carl Gustav Carus, TU Dresden, Germany
| | | | | | | | | |
Collapse
|
144
|
Two p53-related metabolic regulators, TIGAR and SCO2, contribute to oroxylin A-mediated glucose metabolism in human hepatoma HepG2 cells. Int J Biochem Cell Biol 2013; 45:1468-78. [DOI: 10.1016/j.biocel.2013.04.015] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 03/31/2013] [Accepted: 04/15/2013] [Indexed: 11/15/2022]
|
145
|
Calabrese C, Iommarini L, Kurelac I, Calvaruso MA, Capristo M, Lollini PL, Nanni P, Bergamini C, Nicoletti G, Giovanni CD, Ghelli A, Giorgio V, Caratozzolo MF, Marzano F, Manzari C, Betts CM, Carelli V, Ceccarelli C, Attimonelli M, Romeo G, Fato R, Rugolo M, Tullo A, Gasparre G, Porcelli AM. Respiratory complex I is essential to induce a Warburg profile in mitochondria-defective tumor cells. Cancer Metab 2013; 1:11. [PMID: 24280190 PMCID: PMC4178211 DOI: 10.1186/2049-3002-1-11] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Accepted: 02/27/2013] [Indexed: 01/04/2023] Open
Abstract
Background Aerobic glycolysis, namely the Warburg effect, is the main hallmark of cancer cells. Mitochondrial respiratory dysfunction has been proposed to be one of the major causes for such glycolytic shift. This hypothesis has been revisited as tumors appear to undergo waves of gene regulation during progression, some of which rely on functional mitochondria. In this framework, the role of mitochondrial complex I is still debated, in particular with respect to the effect of mitochondrial DNA mutations in cancer metabolism. The aim of this work is to provide the proof of concept that functional complex I is necessary to sustain tumor progression. Methods Complex I-null osteosarcoma cells were complemented with allotopically expressed complex I subunit 1 (MT-ND1). Complex I re-assembly and function recovery, also in terms of NADH consumption, were assessed. Clones were tested for their ability to grow in soft agar and to generate tumor masses in nude mice. Hypoxia levels were evaluated via pimonidazole staining and hypoxia-inducible factor-1α (HIF-1α) immunoblotting and histochemical staining. 454-pyrosequencing was implemented to obtain global transcriptomic profiling of allotopic and non-allotopic xenografts. Results Complementation of a truncative mutation in the gene encoding MT-ND1, showed that a functional enzyme was required to perform the glycolytic shift during the hypoxia response and to induce a Warburg profile in vitro and in vivo, fostering cancer progression. Such trigger was mediated by HIF-1α, whose stabilization was regulated after recovery of the balance between α-ketoglutarate and succinate due to a recuperation of NADH consumption that followed complex I rescue. Conclusion Respiratory complex I is essential for the induction of Warburg effect and adaptation to hypoxia of cancer cells, allowing them to sustain tumor growth. Differently from other mitochondrial tumor suppressor genes, therefore, a complex I severe mutation such as the one here reported may confer anti-tumorigenic properties, highlighting the prognostic values of such genetic markers in cancer.
Collapse
Affiliation(s)
- Claudia Calabrese
- Dip, Scienze Mediche e Chirurgiche (DIMEC), U,O, Genetica Medica, Pol, Universitario S, Orsola-Malpighi, Università di Bologna, via Massarenti 9, Bologna, 40138, Italy.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
146
|
Jose C, Melser S, Benard G, Rossignol R. Mitoplasticity: adaptation biology of the mitochondrion to the cellular redox state in physiology and carcinogenesis. Antioxid Redox Signal 2013; 18:808-49. [PMID: 22989324 DOI: 10.1089/ars.2011.4357] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Adaptation and transformation biology of the mitochondrion to redox status is an emerging domain of physiology and pathophysiology. Mitochondrial adaptations occur in response to accidental changes in cellular energy demand or supply while mitochondrial transformations are a part of greater program of cell metamorphosis. The possible role of mitochondrial adaptations and transformations in pathogenesis remains unexplored, and it has become critical to decipher the stimuli and the underlying molecular pathways. Immediate activation of mitochondrial function was described during acute exercise, respiratory chain injury, Endoplasmic Reticulum stress, genotoxic stress, or environmental toxic insults. Delayed adaptations of mitochondrial form, composition, and functions were evidenced for persistent changes in redox status as observed in endurance training, in fibroblasts grown in presence of respiratory chain inhibitors or in absence of glucose, in the smooth muscle of patients with severe asthma, or in the skeletal muscle of patients with a mitochondrial disease. Besides, mitochondrial transformations were observed in the course of human cell differentiation, during immune response activation, or in cells undergoing carcinogenesis. Little is known on the signals and downstream pathways that govern mitochondrial adaptations and transformations. Few adaptative loops, including redox sensors, kinases, and transcription factors were deciphered, but their implication in physiology and pathology remains elusive. Mitoplasticity could play a protective role against aging, diabetes, cancer, or neurodegenerative diseases. Research on adaptation and transformation could allow the design of innovative therapies, notably in cancer.
Collapse
Affiliation(s)
- Caroline Jose
- University Bordeaux, Maladies Rares: Génétique et Métabolisme, France
| | | | | | | |
Collapse
|
147
|
Krasnov GS, Dmitriev AA, Snezhkina AV, Kudryavtseva AV. Deregulation of glycolysis in cancer: glyceraldehyde-3-phosphate dehydrogenase as a therapeutic target. Expert Opin Ther Targets 2013; 17:681-93. [DOI: 10.1517/14728222.2013.775253] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
148
|
Gasparre G, Porcelli AM, Lenaz G, Romeo G. Relevance of mitochondrial genetics and metabolism in cancer development. Cold Spring Harb Perspect Biol 2013; 5:5/2/a011411. [PMID: 23378588 DOI: 10.1101/cshperspect.a011411] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cancer cells are characterized in general by a decrease of mitochondrial respiration and oxidative phosphorylation, together with a strong enhancement of glycolysis, the so-called Warburg effect. The decrease of mitochondrial activity in cancer cells may have multiple reasons, related either to the input of reducing equivalents to the electron transfer chain or to direct alterations of the mitochondrial respiratory complexes. In some cases, the depression of respiratory activity is clearly the consequence of disruptive mitochondrial DNA (mtDNA) mutations and leads as a consequence to enhanced generation of reactive oxygen species (ROS). By acting both as mutagens and cellular mitogens, ROS may contribute directly to cancer progression. On the basis of our experimental evidence, we suggest a deep implication of the supercomplex organization of the respiratory chain as a missing link between oxidative stress, energy failure, and tumorigenesis. We speculate that under conditions of oxidative stress, a dissociation of mitochondrial supercomplexes occurs, with destabilization of complex I and secondary enhanced generation of ROS, thus leading to a vicious circle amplifying mitochondrial dysfunction. An excellent model to dissect the role of pathogenic, disassembling mtDNA mutations in tumor progression and their contribution to the metabolic reprogramming of cancer cells (glycolysis vs. respiration) is provided by an often underdiagnosed subset of tumors, namely, the oncocytomas, characterized by disruptive mutations of mtDNA, especially of complex I subunits. Such mutations almost completely abolish complex I activity, which slows down the Krebs cycle, favoring a high ratio of α-ketoglutarate/succinate and consequent destabilization of hypoxia inducible factor 1α (HIF1α). On the other hand, if complex I is partially defective, the levels of NAD(+) may be sufficient to implement the Krebs cycle with higher levels of intermediates that stabilize HIF1α, thus favoring tumor malignancy. The threshold model we propose, based on the population-like dynamics of mitochondrial genetics (heteroplasmy vs. homoplasmy), implies that below threshold complex I is present and functioning correctly, thus favoring tumor growth, whereas above threshold, when complex I is not assembled, tumor growth is arrested. We have therefore termed "oncojanus" the mtDNA genes whose disruptive mutations have such a double-edged effect.
Collapse
Affiliation(s)
- Giuseppe Gasparre
- Department of Medical and Surgical Sciences, Unit of Medical Genetics, University of Bologna Medical School, 40138 Bologna, Italy
| | | | | | | |
Collapse
|
149
|
Iommarini L, Calvaruso MA, Kurelac I, Gasparre G, Porcelli AM. Complex I impairment in mitochondrial diseases and cancer: Parallel roads leading to different outcomes. Int J Biochem Cell Biol 2013; 45:47-63. [DOI: 10.1016/j.biocel.2012.05.016] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 05/03/2012] [Accepted: 05/24/2012] [Indexed: 02/06/2023]
|
150
|
Redox homeostasis in pancreatic β cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2012; 2012:932838. [PMID: 23304259 PMCID: PMC3532876 DOI: 10.1155/2012/932838] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Accepted: 10/30/2012] [Indexed: 12/20/2022]
Abstract
We reviewed mechanisms that determine reactive oxygen species (redox) homeostasis, redox information signaling and metabolic/regulatory function of autocrine insulin signaling in pancreatic β cells, and consequences of oxidative stress and dysregulation of redox/information signaling for their dysfunction. We emphasize the role of mitochondrion in β cell molecular physiology and pathology, including the antioxidant role of mitochondrial uncoupling protein UCP2. Since in pancreatic β cells pyruvate cannot be easily diverted towards lactate dehydrogenase for lactate formation, the respiration and oxidative phosphorylation intensity are governed by the availability of glucose, leading to a certain ATP/ADP ratio, whereas in other cell types, cell demand dictates respiration/metabolism rates. Moreover, we examine the possibility that type 2 diabetes mellitus might be considered as an inevitable result of progressive self-accelerating oxidative stress and concomitantly dysregulated information signaling in peripheral tissues as well as in pancreatic β cells. It is because the redox signaling is inherent to the insulin receptor signaling mechanism and its impairment leads to the oxidative and nitrosative stress. Also emerging concepts, admiting participation of redox signaling even in glucose sensing and insulin release in pancreatic β cells, fit in this view. For example, NADPH has been firmly established to be a modulator of glucose-stimulated insulin release.
Collapse
|