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Cenigaonandia-Campillo A, Garcia-Bautista A, Rio-Vilariño A, Cebrian A, Del Puerto L, Pellicer JA, Gabaldón JA, Pérez-Sánchez H, Carmena-Bargueño M, Meroño C, Traba J, Fernandez-Aceñero MJ, Baños-Herraiz N, Mozas-Vivar L, Núñez-Delicado E, Garcia-Foncillas J, Aguilera Ó. Vitamin-C-dependent downregulation of the citrate metabolism pathway potentiates pancreatic ductal adenocarcinoma growth arrest. Mol Oncol 2024. [PMID: 38425123 DOI: 10.1002/1878-0261.13616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 01/17/2024] [Accepted: 02/15/2024] [Indexed: 03/02/2024] Open
Abstract
In pancreatic ductal adenocarcinoma (PDAC), metabolic rewiring and resistance to standard therapy are closely associated. PDAC cells show enormous requirements for glucose-derived citrate, the first rate-limiting metabolite in the synthesis of new lipids. Both the expression and activity of citrate synthase (CS) are extraordinarily upregulated in PDAC. However, no previous relationship between gemcitabine response and citrate metabolism has been documented in pancreatic cancer. Here, we report for the first time that pharmacological doses of vitamin C are capable of exerting an inhibitory action on the activity of CS, reducing glucose-derived citrate levels. Moreover, ascorbate targets citrate metabolism towards the de novo lipogenesis pathway, impairing fatty acid synthase (FASN) and ATP citrate lyase (ACLY) expression. Lowered citrate availability was found to be directly associated with diminished proliferation and, remarkably, enhanced gemcitabine response. Moreover, the deregulated citrate-derived lipogenic pathway correlated with a remarkable decrease in extracellular pH through inhibition of lactate dehydrogenase (LDH) and overall reduced glycolytic metabolism. Modulation of citric acid metabolism in highly chemoresistant pancreatic adenocarcinoma, through molecules such as vitamin C, could be considered as a future clinical option to improve patient response to standard chemotherapy regimens.
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Affiliation(s)
| | - Ana Garcia-Bautista
- Translational Oncology Division, Oncohealth Institute, IIS-Fundación Jimenez Diaz-UAM (Madrid), Spain
| | - Anxo Rio-Vilariño
- Translational Oncology Division, Oncohealth Institute, IIS-Fundación Jimenez Diaz-UAM (Madrid), Spain
| | - Arancha Cebrian
- Translational Oncology Division, Oncohealth Institute, IIS-Fundación Jimenez Diaz-UAM (Madrid), Spain
| | - Laura Del Puerto
- Translational Oncology Division, Oncohealth Institute, IIS-Fundación Jimenez Diaz-UAM (Madrid), Spain
| | - José Antonio Pellicer
- Molecular Recognition and Encapsulation Research Group (REM), Health Sciences Department, Universidad Católica de Murcia (UCAM), Spain
| | - José Antonio Gabaldón
- Molecular Recognition and Encapsulation Research Group (REM), Health Sciences Department, Universidad Católica de Murcia (UCAM), Spain
| | - Horacio Pérez-Sánchez
- Bioinformatics and High-Performance Computing Research Group (BIO-HPC), Computer Engineering Department, Universidad Católica de Murcia (UCAM), Spain
| | - Miguel Carmena-Bargueño
- Bioinformatics and High-Performance Computing Research Group (BIO-HPC), Computer Engineering Department, Universidad Católica de Murcia (UCAM), Spain
| | - Carolina Meroño
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid (CSIC-UAM), Spain
- Instituto Universitario de Biología Molecular-UAM (IUBM-UAM), Departamento de Biología Molecular, Universidad Autónoma de Madrid, Spain
| | - Javier Traba
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid (CSIC-UAM), Spain
- Instituto Universitario de Biología Molecular-UAM (IUBM-UAM), Departamento de Biología Molecular, Universidad Autónoma de Madrid, Spain
| | | | | | - Lorena Mozas-Vivar
- Preclinical programe START Madrid-FJD Hospital fundación Jiménez Díaz, Spain
| | - Estrella Núñez-Delicado
- Molecular Recognition and Encapsulation Research Group (REM), Health Sciences Department, Universidad Católica de Murcia (UCAM), Spain
| | - Jesús Garcia-Foncillas
- Translational Oncology Division, Oncohealth Institute, IIS-Fundación Jimenez Diaz-UAM (Madrid), Spain
| | - Óscar Aguilera
- Translational Oncology Division, Oncohealth Institute, IIS-Fundación Jimenez Diaz-UAM (Madrid), Spain
- Universidad Católica de Murcia (UCAM), Spain
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2
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Kim HJ, Hong JH. Trafficking of carbonic anhydrase 12 and bicarbonate transporters by histamine stimulation mediates intracellular acidic scenario in lung cancer cells. J Enzyme Inhib Med Chem 2023; 38:2247181. [PMID: 37587861 PMCID: PMC10438860 DOI: 10.1080/14756366.2023.2247181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 08/07/2023] [Accepted: 08/07/2023] [Indexed: 08/18/2023] Open
Abstract
Carbonic anhydrase 12 is considered an oncogenic and acidic microenvironmental factor in cancer cells. To verify the role of histamine signalling as an anti-cancer signal, we determined the roles of CA12 and its associated bicarbonate transporters. In this study, histamine stimulation mediated mislocalization of CA12 in lung cancer cells. Histamine receptor activation-mediated CA12 endocytosis and pH were restored by CaMKII inhibition. CA12-associated AE2 expression was enhanced, whereas NBCn1 expression and its activity were reduced by histamine stimulation. Histamine receptor activation-mediated acidification was induced by internalised CA12 and NBCn1 and, at the same time by increased bicarbonate efflux through enhanced AE2 expression. Inhibition of protein trafficking by bafilomycin restored CA12 and AE2 localisation and diminished cellular acidosis. Thus, we verified that histamine stimulation induced an acidic scenario, which revealed trafficking of CA12 and its associated bicarbonate transporters in lung cancer cells and its dysregulated pH modulation may be involved in the histamine signalling-mediated anti-cancer process.
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Affiliation(s)
- Hyeong jae Kim
- Department of Physiology, College of Medicine, Gachon University, Lee Gil Ya Cancer and Diabetes Institute, Incheon, South Korea
| | - Jeong Hee Hong
- Department of Physiology, College of Medicine, Gachon University, Lee Gil Ya Cancer and Diabetes Institute, Incheon, South Korea
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3
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Lasaad S, Walter C, Rafael C, Morla L, Doucet A, Picard N, Blanchard A, Fromes Y, Matot B, Crambert G, Cheval L. GDF15 mediates renal cell plasticity in response to potassium depletion in mice. Acta Physiol (Oxf) 2023; 239:e14046. [PMID: 37665159 DOI: 10.1111/apha.14046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 09/05/2023]
Abstract
OBJECTIVE To understand the mechanisms involved in the response to a low-K+ diet (LK), we investigated the role of the growth factor GDF15 and the ion pump H,K-ATPase type 2 (HKA2) in this process. METHODS Male mice of different genotypes (WT, GDF15-KO, and HKA2-KO) were fed an LK diet for different periods of time. We analyzed GDF15 levels, metabolic and physiological parameters, and the cellular composition of collecting ducts. RESULTS Mice fed an LK diet showed a 2-4-fold increase in plasma and urine GDF15 levels. Compared to WT mice, GDF15-KO mice rapidly developed hypokalemia due to impaired renal adaptation. This is related to their 1/ inability to increase the number of type A intercalated cells (AIC) and 2/ absence of upregulation of H,K-ATPase type 2 (HKA2), the two processes responsible for K+ retention. Interestingly, we showed that the GDF15-mediated proliferative effect on AIC was dependent on the ErbB2 receptor and required the presence of HKA2. Finally, renal leakage of K+ induced a reduction in muscle mass in GDF15-KO mice fed LK diet. CONCLUSIONS In this study, we showed that GDF15 and HKA2 are linked and play a central role in the response to K+ restriction by orchestrating the modification of the cellular composition of the collecting duct.
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Affiliation(s)
- Samia Lasaad
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
| | - Christine Walter
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
| | - Chloé Rafael
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
| | - Luciana Morla
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
| | - Alain Doucet
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
| | - Nicolas Picard
- Laboratory of Tissue Biology and Therapeutic Engineering, UMR 5305 CNRS, University Lyon 1, Lyon, France
| | - Anne Blanchard
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
- Assistance Publique Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Centre d'Investigation Clinique, Paris, France
| | - Yves Fromes
- NMR Laboratory, Neuromuscular Investigation Center, Institute of Myology, Paris, France
| | - Béatrice Matot
- NMR Laboratory, Neuromuscular Investigation Center, Institute of Myology, Paris, France
| | - Gilles Crambert
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
| | - Lydie Cheval
- Laboratoire de Physiologie Rénale et Tubulopathies, Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université Paris Cité, Paris, France
- CNRS EMR 8228 - Unité Métabolisme et Physiologie Rénale, Paris, France
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4
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Di Molfetta D, Cannone S, Greco MR, Caroppo R, Piccapane F, Carvalho TMA, Altamura C, Saltarella I, Tavares Valente D, Desaphy JF, Reshkin SJ, Cardone RA. ECM Composition Differentially Regulates Intracellular and Extracellular pH in Normal and Cancer Pancreatic Duct Epithelial Cells. Int J Mol Sci 2023; 24:10632. [PMID: 37445810 DOI: 10.3390/ijms241310632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 06/07/2023] [Accepted: 06/17/2023] [Indexed: 07/15/2023] Open
Abstract
Intracellular pH (pHi) regulation is a challenge for the exocrine pancreas, where the luminal secretion of bicarbonate-rich fluid is accompanied by interstitial flows of acid. This acid-base transport requires a plethora of ion transporters, including bicarbonate transporters and the Na+/H+ exchanger isoform 1 (NHE1), which are dysregulated in Pancreatic Ductal Adenocarcinoma (PDAC). PDAC progression is favored by a Collagen-I rich extracellular matrix (ECM) which exacerbates the physiological interstitial acidosis. In organotypic cultures of normal human pancreatic cells (HPDE), parenchymal cancer cells (CPCs) and cancer stem cells (CSCs) growing on matrices reproducing ECM changes during progression, we studied resting pHi, the pHi response to fluxes of NaHCO3 and acidosis and the role of NHE1 in pHi regulation. Our findings show that: (i) on the physiological ECM, HPDE cells have the most alkaline pHi, followed by CSCs and CPCs, while a Collagen I-rich ECM reverses the acid-base balance in cancer cells compared to normal cells; (ii) both resting pHi and pHi recovery from an acid load are reduced by extracellular NaHCO3, especially in HPDE cells on a normal ECM; (iii) cancer cell NHE1 activity is less affected by NaHCO3. We conclude that ECM composition and the fluctuations of pHe cooperate to predispose pHi homeostasis towards the presence of NaHCO3 gradients similar to that expected in the tumor.
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Affiliation(s)
- Daria Di Molfetta
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Stefania Cannone
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Maria Raffaella Greco
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Rosa Caroppo
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Francesca Piccapane
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
| | | | - Concetta Altamura
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy
| | - Ilaria Saltarella
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy
| | - Diana Tavares Valente
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Jean Francois Desaphy
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy
| | - Stephan J Reshkin
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Rosa Angela Cardone
- Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70126 Bari, Italy
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5
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Jang G, Oh J, Jun E, Lee J, Kwon JY, Kim J, Lee SH, Kim SC, Cho SY, Lee C. Direct cell-to-cell transfer in stressed tumor microenvironment aggravates tumorigenic or metastatic potential in pancreatic cancer. NPJ Genom Med 2022; 7:63. [PMID: 36302783 PMCID: PMC9613679 DOI: 10.1038/s41525-022-00333-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 10/11/2022] [Indexed: 11/09/2022] Open
Abstract
Pancreatic cancer exhibits a characteristic tumor microenvironment (TME) due to enhanced fibrosis and hypoxia and is particularly resistant to conventional chemotherapy. However, the molecular mechanisms underlying TME-associated treatment resistance in pancreatic cancer are not fully understood. Here, we developed an in vitro TME mimic system comprising pancreatic cancer cells, fibroblasts and immune cells, and a stress condition, including hypoxia and gemcitabine. Cells with high viability under stress showed evidence of increased direct cell-to-cell transfer of biomolecules. The resulting derivative cells (CD44high/SLC16A1high) were similar to cancer stem cell-like-cells (CSCs) with enhanced anchorage-independent growth or invasiveness and acquired metabolic reprogramming. Furthermore, CD24 was a determinant for transition between the tumorsphere formation or invasive properties. Pancreatic cancer patients with CD44low/SLC16A1low expression exhibited better prognoses compared to other groups. Our results suggest that crosstalk via direct cell-to-cell transfer of cellular components foster chemotherapy-induced tumor evolution and that targeting of CD44 and MCT1(encoded by SLC16A1) may be useful strategy to prevent recurrence of gemcitabine-exposed pancreatic cancers.
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Affiliation(s)
- Giyong Jang
- Department of Life Science, Ewha Womans University, Seoul, 03760, Republic of Korea.,Ewha-JAX Cancer Immunotherapy Research Center, Ewha Womans University, Seoul, 03760, Republic of Korea.,Medical Research Center, Genomic Medicine Institute, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Jaeik Oh
- Department of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.,Department of Internal Medicine, Seoul National University Hospital, Seoul, 03080, Republic of Korea
| | - Eunsung Jun
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea.,Asan Medical Institute of Convergence Science and Technology (AMIST), Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea.,Department of Convergence Medicine, Asan Institute for Life Sciences, University of Ulsan College of Medicine and Asan Medical Center, Seoul, 05505, Republic of Korea
| | - Jieun Lee
- Department of Life Science, Ewha Womans University, Seoul, 03760, Republic of Korea.,Ewha-JAX Cancer Immunotherapy Research Center, Ewha Womans University, Seoul, 03760, Republic of Korea.,Department of Surgery, Seoul National University Bundang Hospital, Gyeonggi-do, 13620, Republic of Korea
| | - Jee Young Kwon
- Department of Life Science, Ewha Womans University, Seoul, 03760, Republic of Korea.,Ewha-JAX Cancer Immunotherapy Research Center, Ewha Womans University, Seoul, 03760, Republic of Korea.,The Jackson Laboratory for Genomic Medicine, Farmington, CT, 06032, USA
| | - Jaesang Kim
- Department of Life Science, Ewha Womans University, Seoul, 03760, Republic of Korea.,Ewha-JAX Cancer Immunotherapy Research Center, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Sang-Hyuk Lee
- Department of Life Science, Ewha Womans University, Seoul, 03760, Republic of Korea.,Ewha-JAX Cancer Immunotherapy Research Center, Ewha Womans University, Seoul, 03760, Republic of Korea.,Department of Bio-Information Science, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Song Cheol Kim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea.,Asan Medical Institute of Convergence Science and Technology (AMIST), Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea.,Department of Convergence Medicine, Asan Institute for Life Sciences, University of Ulsan College of Medicine and Asan Medical Center, Seoul, 05505, Republic of Korea
| | - Sung-Yup Cho
- Medical Research Center, Genomic Medicine Institute, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea. .,Department of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea. .,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea. .,Cancer Research Institute, Seoul National University, Seoul, 03080, Republic of Korea.
| | - Charles Lee
- Department of Life Science, Ewha Womans University, Seoul, 03760, Republic of Korea. .,Ewha-JAX Cancer Immunotherapy Research Center, Ewha Womans University, Seoul, 03760, Republic of Korea. .,The Jackson Laboratory for Genomic Medicine, Farmington, CT, 06032, USA.
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6
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Ferdek PE, Krzysztofik D, Stopa KB, Kusiak AA, Paw M, Wnuk D, Jakubowska MA. When healing turns into killing ‐ the pathophysiology of pancreatic and hepatic fibrosis. J Physiol 2022; 600:2579-2612. [DOI: 10.1113/jp281135] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 04/12/2022] [Indexed: 01/18/2023] Open
Affiliation(s)
- Pawel E. Ferdek
- Department of Cell Biology Faculty of Biochemistry Biophysics and Biotechnology Jagiellonian University Krakow Poland
| | - Daria Krzysztofik
- Malopolska Centre of Biotechnology Jagiellonian University Krakow Poland
| | - Kinga B. Stopa
- Malopolska Centre of Biotechnology Jagiellonian University Krakow Poland
| | - Agnieszka A. Kusiak
- Department of Cell Biology Faculty of Biochemistry Biophysics and Biotechnology Jagiellonian University Krakow Poland
| | - Milena Paw
- Department of Cell Biology Faculty of Biochemistry Biophysics and Biotechnology Jagiellonian University Krakow Poland
| | - Dawid Wnuk
- Department of Cell Biology Faculty of Biochemistry Biophysics and Biotechnology Jagiellonian University Krakow Poland
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7
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Kalthoff H. How open is the therapeutic horizon for pancreatic cancer patients? Hepatobiliary Pancreat Dis Int 2022; 21:1-3. [PMID: 34789410 DOI: 10.1016/j.hbpd.2021.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 10/26/2021] [Indexed: 02/05/2023]
Affiliation(s)
- Holger Kalthoff
- Institute for Experimental Cancer Research, Christian-Albrechts-University, Kiel, Germany.
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8
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Carvalho TMA, Di Molfetta D, Greco MR, Koltai T, Alfarouk KO, Reshkin SJ, Cardone RA. Tumor Microenvironment Features and Chemoresistance in Pancreatic Ductal Adenocarcinoma: Insights into Targeting Physicochemical Barriers and Metabolism as Therapeutic Approaches. Cancers (Basel) 2021; 13:6135. [PMID: 34885243 PMCID: PMC8657427 DOI: 10.3390/cancers13236135] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/26/2021] [Accepted: 12/01/2021] [Indexed: 12/14/2022] Open
Abstract
Currently, the median overall survival of PDAC patients rarely exceeds 1 year and has an overall 5-year survival rate of about 9%. These numbers are anticipated to worsen in the future due to the lack of understanding of the factors involved in its strong chemoresistance. Chemotherapy remains the only treatment option for most PDAC patients; however, the available therapeutic strategies are insufficient. The factors involved in chemoresistance include the development of a desmoplastic stroma which reprograms cellular metabolism, and both contribute to an impaired response to therapy. PDAC stroma is composed of immune cells, endothelial cells, and cancer-associated fibroblasts embedded in a prominent, dense extracellular matrix associated with areas of hypoxia and acidic extracellular pH. While multiple gene mutations are involved in PDAC initiation, this desmoplastic stroma plays an important role in driving progression, metastasis, and chemoresistance. Elucidating the mechanisms underlying PDAC resistance are a prerequisite for designing novel approaches to increase patient survival. In this review, we provide an overview of the stromal features and how they contribute to the chemoresistance in PDAC treatment. By highlighting new paradigms in the role of the stromal compartment in PDAC therapy, we hope to stimulate new concepts aimed at improving patient outcomes.
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Affiliation(s)
- Tiago M. A. Carvalho
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (D.D.M.); (M.R.G.); (S.J.R.); (R.A.C.)
| | - Daria Di Molfetta
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (D.D.M.); (M.R.G.); (S.J.R.); (R.A.C.)
| | - Maria Raffaella Greco
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (D.D.M.); (M.R.G.); (S.J.R.); (R.A.C.)
| | | | - Khalid O. Alfarouk
- Al-Ghad International College for Applied Medical Sciences, Al-Madinah Al-Munwarah 42316, Saudi Arabia;
| | - Stephan J. Reshkin
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (D.D.M.); (M.R.G.); (S.J.R.); (R.A.C.)
| | - Rosa A. Cardone
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (D.D.M.); (M.R.G.); (S.J.R.); (R.A.C.)
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9
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Role of Stromal Cells in Determining Tumor and Cancer Stem Cell Behaviors and Therapeutic Response. Cancers (Basel) 2020; 12:cancers12113162. [PMID: 33126471 PMCID: PMC7693000 DOI: 10.3390/cancers12113162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 10/27/2020] [Indexed: 11/17/2022] Open
Abstract
While research previously focused extensively on the tumor cells, over the last two decades, the tumor microenvironment (TME) has received increasing attention with a particular emphasis in its role in tumor development, metabolism, progression, and treatment response [...].
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10
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Jentzsch V, Davis JAA, Djamgoz MBA. Pancreatic Cancer (PDAC): Introduction of Evidence-Based Complementary Measures into Integrative Clinical Management. Cancers (Basel) 2020; 12:E3096. [PMID: 33114159 PMCID: PMC7690843 DOI: 10.3390/cancers12113096] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 10/09/2020] [Indexed: 02/07/2023] Open
Abstract
The most common form of pancreatic cancer is pancreatic ductal adenocarcinoma (PDAC), which comprises some 85% of all cases. Currently, this is the fourth highest cause of cancer mortality worldwide and its incidence is rising steeply. Commonly applied clinical therapies offer limited chance of a lasting cure and the five-year survival rate is one of the lowest of the commonly occurring cancers. This review cultivates the hypothesis that the best management of PDAC would be possible by integrating 'western' clinical medicine with evidence-based complementary measures. Protecting the liver, where PDAC frequently first spreads, is also given some consideration. Overall, the complementary measures are divided into three groups: dietary factors, nutraceutical agents and lifestyle. In turn, dietary factors are considered as general conditioners, multi-factorial foodstuffs and specific compounds. The general conditioners are alkalinity, low-glycemic index and low-cholesterol. The multi-factorial foodstuffs comprise red meat, fish, fruit/vegetables, dairy, honey and coffee. The available evidence for the beneficial effects of the specific dietary and nutraceutical agents was considered at four levels (in order of prominence): clinical trials, meta-analyses, in vivo tests and in vitro studies. Thus, 9 specific agents were identified (6 dietary and 3 nutraceutical) as acceptable for integration with gemcitabine chemotherapy, the first-line treatment for pancreatic cancer. The specific dietary agents were the following: Vitamins A, C, D and E, genistein and curcumin. As nutraceutical compounds, propolis, triptolide and cannabidiol were accepted. The 9 complementary agents were sub-grouped into two with reference to the main 'hallmarks of cancer'. Lifestyle factors covered obesity, diabetes, smoking, alcohol and exercise. An integrative treatment regimen was devised for the management of PDAC patients. This involved combining first-line gemcitabine chemotherapy with the two sub-groups of complementary agents alternately in weekly cycles. The review concludes that integrated management currently offers the best patient outcome. Opportunities to be investigated in the future include emerging modalities, precision medicine, the nerve input to tumors and, importantly, clinical trials.
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Affiliation(s)
- Valerie Jentzsch
- Department of Life Sciences, Neuroscience Solutions to Cancer Research Group, Imperial College London, South Kensington Campus, London SW7 2AZ, UK; (V.J.); (J.A.A.D.)
- Business School, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - James A. A. Davis
- Department of Life Sciences, Neuroscience Solutions to Cancer Research Group, Imperial College London, South Kensington Campus, London SW7 2AZ, UK; (V.J.); (J.A.A.D.)
| | - Mustafa B. A. Djamgoz
- Department of Life Sciences, Neuroscience Solutions to Cancer Research Group, Imperial College London, South Kensington Campus, London SW7 2AZ, UK; (V.J.); (J.A.A.D.)
- Biotechnology Research Centre, Cyprus International University, Haspolat, Nicosia, TRNC, Mersin 10, Turkey
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Schnipper J, Dhennin-Duthille I, Ahidouch A, Ouadid-Ahidouch H. Ion Channel Signature in Healthy Pancreas and Pancreatic Ductal Adenocarcinoma. Front Pharmacol 2020; 11:568993. [PMID: 33178018 PMCID: PMC7596276 DOI: 10.3389/fphar.2020.568993] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 09/16/2020] [Indexed: 12/11/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is the fourth most common cause of cancer-related deaths in United States and Europe. It is predicted that PDAC will become the second leading cause of cancer-related deaths during the next decades. The development of PDAC is not well understood, however, studies have shown that dysregulated exocrine pancreatic fluid secretion can contribute to pathologies of exocrine pancreas, including PDAC. The major roles of healthy exocrine pancreatic tissue are secretion of enzymes and bicarbonate rich fluid, where ion channels participate to fine-tune these biological processes. It is well known that ion channels located in the plasma membrane regulate multiple cellular functions and are involved in the communication between extracellular events and intracellular signaling pathways and can function as signal transducers themselves. Hereby, they contribute to maintain resting membrane potential, electrical signaling in excitable cells, and ion homeostasis. Despite their contribution to basic cellular processes, ion channels are also involved in the malignant transformation from a normal to a malignant phenotype. Aberrant expression and activity of ion channels have an impact on essentially all hallmarks of cancer defined as; uncontrolled proliferation, evasion of apoptosis, sustained angiogenesis and promotion of invasion and migration. Research indicates that certain ion channels are involved in the aberrant tumor growth and metastatic processes of PDAC. The purpose of this review is to summarize the important expression, localization, and function of ion channels in normal exocrine pancreatic tissue and how they are involved in PDAC progression and development. As ion channels are suggested to be potential targets of treatment they are furthermore suggested to be biomarkers of different cancers. Therefore, we describe the importance of ion channels in PDAC as markers of diagnosis and clinical factors.
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Affiliation(s)
- Julie Schnipper
- Laboratory of Cellular and Molecular Physiology, UR-4667, University of Picardie Jules Verne, Amiens, France
| | - Isabelle Dhennin-Duthille
- Laboratory of Cellular and Molecular Physiology, UR-4667, University of Picardie Jules Verne, Amiens, France
| | - Ahmed Ahidouch
- Laboratory of Cellular and Molecular Physiology, UR-4667, University of Picardie Jules Verne, Amiens, France.,Department of Biology, Faculty of Sciences, Ibn Zohr University, Agadir, Morocco
| | - Halima Ouadid-Ahidouch
- Laboratory of Cellular and Molecular Physiology, UR-4667, University of Picardie Jules Verne, Amiens, France
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12
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Role of pH Regulatory Proteins and Dysregulation of pH in Prostate Cancer. Rev Physiol Biochem Pharmacol 2020; 182:85-110. [PMID: 32776252 DOI: 10.1007/112_2020_18] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Prostate cancer is the fourth most commonly diagnosed cancer, and although it is often a slow-growing malignancy, it is the second leading cause of cancer-associated deaths in men and the first in Europe and North America. In many forms of cancer, when the disease is a solid tumor confined to one organ, it is often readily treated. However, when the cancer becomes an invasive metastatic carcinoma, it is more often fatal. It is therefore of great interest to identify mechanisms that contribute to the invasion of cells to identify possible targets for therapy. During prostate cancer progression, the epithelial cells undergo epithelial-mesenchymal transition that is characterized by morphological changes, a loss of cell-cell adhesion, and invasiveness. Dysregulation of pH has emerged as a hallmark of cancer with a reversed pH gradient and with a constitutively increased intracellular pH that is elevated above the extracellular pH. This phenomenon has been referred to as "a perfect storm" for cancer progression. Acid-extruding ion transporters include the Na+/H+ exchanger NHE1 (SLC9A1), the Na+HCO3- cotransporter NBCn1 (SLC4A7), anion exchangers, vacuolar-type adenosine triphosphatases, and the lactate-H+ cotransporters of the monocarboxylate family (MCT1 and MCT4 (SLC16A1 and 3)). Additionally, carbonic anhydrases contribute to acid transport. Of these, several have been shown to be upregulated in different human cancers including the NBCn1, MCTs, and NHE1. Here the role and contribution of acid-extruding transporters in prostate cancer growth and metastasis were examined. These proteins make significant contributions to prostate cancer progression.
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Abstract
Ion channels and transporters (ICT) play important roles in almost all basic cellular processes. During last decades, abundant evidences have been provided that ICT (e.g., Ca2+ and K+ channels) are notable for regulating physiological pancreatic duct cellular function and deregulation of ICT is closely associated with the widely accepted hallmarks of pancreatic ductal adenocarcinoma (PDAC) such as proliferation, apoptosis resistance, invasion, and metastasis. Hence this review focuses on the role of ICT malfunctions in context with the hallmarks of PDAC. After briefly introducing epidemiology and history of molecular oncology of PDAC and summarizing the recent studies on molecular classification systems, we focus then on the exocrine pancreas as a very active secretory gland which considerably impacts the changes in the ion transport system (the transportome) upon malignant transformation. We highlight multiplicity of ICT members (H+ transporters, Ca2+, K+, Na+ and Cl- channels) and their functional impact in PDAC. We also present some selective therapeutic options to interfere with transportome functions and thereby with key mechanisms of malignant progression. This will hopefully contribute to a better clinical outcome based on improved therapeutic strategies for this still extremely deadly disease.
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14
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Malinda RR, Zeeberg K, Sharku PC, Ludwig MQ, Pedersen LB, Christensen ST, Pedersen SF. TGFβ Signaling Increases Net Acid Extrusion, Proliferation and Invasion in Panc-1 Pancreatic Cancer Cells: SMAD4 Dependence and Link to Merlin/NF2 Signaling. Front Oncol 2020; 10:687. [PMID: 32457840 PMCID: PMC7221161 DOI: 10.3389/fonc.2020.00687] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 04/14/2020] [Indexed: 12/14/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a major cause of cancer-related death, with a 5-year survival of <10% and severely limited treatment options. PDAC hallmarks include profound metabolic acid production and aggressive local proliferation and invasiveness. This phenotype is supported by upregulated net acid extrusion and epithelial-to-mesenchymal transition (EMT), the latter typically induced by aberrant transforming growth factor-β (TGFβ) signaling. It is, however, unknown whether TGFβ-induced EMT and upregulation of acid extrusion are causally related. Here, we show that mRNA and protein expression of the net acid extruding transporters Na+/H+ exchanger 1 (NHE1, SLC9A1) and Na+, HCO3- cotransporter 1 (NBCn1, SLC4A7) are increased in a panel of human PDAC cell lines compared to immortalized human pancreatic ductal epithelial (HPDE) cells. Treatment of Panc-1 cells (which express SMAD4, required for canonical TGFβ signaling) with TGFβ-1 for 48 h elicited classical EMT with down- and upregulation of epithelial and mesenchymal markers, respectively, in a manner inhibited by SMAD4 knockdown. Accordingly, less pronounced EMT was induced in BxPC-3 cells, which do not express SMAD4. TGFβ-1 treatment elicited a SMAD4-dependent increase in NHE1 expression, and a smaller, SMAD4-independent increase in NBCn1 in Panc-1 cells. Consistent with this, TGFβ-1 treatment led to elevated intracellular pH and increased net acid extrusion capacity in Panc-1 cells, but not in BxPC-3 cells, in an NHE1-dependent manner. Proliferation was increased in Panc-1 cells and decreased in BxPC-3 cells, upon TGFβ-1 treatment, and this, as well as EMT per se, was unaffected by NHE1- or NBCn1 inhibition. TGFβ-1-induced EMT was associated with a 4-fold increase in Panc-1 cell invasiveness, which further increased ~10-fold upon knockdown of the tumor suppressor Merlin (Neurofibromatosis type 2). Knockdown of NHE1 or NBCn1 abolished Merlin-induced invasiveness, but not that induced by TGFβ-1 alone. In conclusion, NHE1 and NBCn1 expression and NHE-dependent acid extrusion are upregulated during TGFβ-1-induced EMT of Panc-1 cells. NHE1 upregulation is SMAD4-dependent, and SMAD4-deficient BxPC-3 cells show no change in pHi regulation. NHE1 and NBCn1 are not required for EMT per se or EMT-associated proliferation changes, but are essential for the potentiation of invasiveness induced by Merlin knockdown.
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Affiliation(s)
- Raj R Malinda
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Katrine Zeeberg
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Patricia C Sharku
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Mette Q Ludwig
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Lotte B Pedersen
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Søren T Christensen
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Stine F Pedersen
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
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15
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LEFTY2/endometrial bleeding-associated factor up-regulates Na+ Coupled Glucose Transporter SGLT1 expression and Glycogen Accumulation in Endometrial Cancer Cells. PLoS One 2020; 15:e0230044. [PMID: 32236143 PMCID: PMC7112196 DOI: 10.1371/journal.pone.0230044] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 02/20/2020] [Indexed: 02/05/2023] Open
Abstract
LEFTY2 (endometrial bleeding associated factor; EBAF or LEFTYA), a cytokine released shortly before menstrual bleeding, is a negative regulator of cell proliferation and tumour growth. LEFTY2 down-regulates Na+/H+ exchanger activity with subsequent inhibition of glycolytic flux and lactate production in endometrial cancer cells. Glucose can be utilized not only for glycolysis but also for glycogen formation. Both glycolysis and glycogen formation require cellular glucose uptake which could be accomplished by the Na+ coupled glucose transporter-1 (SGLT1; SLC5A1). The present study therefore explored whether LEFTY2 modifies endometrial SGLT1 expression and activity as well as glycogen formation. Ishikawa and HEC1a cells were exposed to LEFTY2, SGLT1 and glycogen synthase (GYS1) transcript levels determined by qRT-PCR. SGLT1, GYS1 and phospho-GYS1 protein abundance was quantified by western blotting, cellular glucose uptake from 2-(N-(7-Nitrobenz-2-oxa-1,3-diazol-4-yl)Amino)-2-Deoxyglucose (2-NBDG) uptake, and cellular glycogen content utilizing an enzymatic assay and subsequent colorimetry. As a result, a 48-hour treatment with LEFTY2 significantly increased SGLT1 and GYS1 transcript levels as well as SGLT1 and GYS1 protein abundance in both Ishikawa and HEC1a cells. 2-NBDG uptake and cellular glycogen content were upregulated significantly in Ishikawa (type 1) but not in type 2 endometrial HEC1a cells, although there was a tendency of increased 2-NBDG uptake. Further, none of the effects were seen in human benign endometrial cells (HESCs). Interestingly, in both Ishikawa and HEC1a cells, a co-treatment with TGF-β reduced SGLT1, GYS and phospho-GYS protein levels, and thus reduced glycogen levels and again HEC1a cells had no significant change. In conclusion, LEFTY2 up-regulates expression and activity of the Na+ coupled glucose transporter SGLT1 and glycogen synthase GYS1 in a cell line specific manner. We further show the treatment with LEFTY2 fosters cellular glucose uptake and glycogen formation and TGF-β can negate this effect in endometrial cancer cells.
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16
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Tawfik D, Zaccagnino A, Bernt A, Szczepanowski M, Klapper W, Schwab A, Kalthoff H, Trauzold A. The A818-6 system as an in-vitro model for studying the role of the transportome in pancreatic cancer. BMC Cancer 2020; 20:264. [PMID: 32228510 PMCID: PMC7106758 DOI: 10.1186/s12885-020-06773-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 03/23/2020] [Indexed: 02/08/2023] Open
Abstract
Background The human pancreatic cancer cell line A818–6 can be grown in vitro either as a highly malignant, undifferentiated monolayer (ML) or as three-dimensional (3D) single layer hollow spheres (HS) simulating a benign, highly differentiated, duct-like pancreatic epithelial structure. This characteristic allowing A818–6 cells to switch from one phenotype to another makes these cells a unique system to characterize the cellular and molecular modifications during differentiation on one hand and malignant transformation on the other hand. Ion channels and transport proteins (transportome) have been implicated in malignant transformation. Therefore, the current study aimed to analyse the transportome gene expression profile in the A818–6 cells growing as a monolayer or as hollow spheres. Methods & Results The study identified the differentially expressed transportome genes in both cellular states of A818–6 using Agilent and Nanostring arrays and some targets were validated via immunoblotting. Additionally, these results were compared to a tissue Affymetrix microarray analysis of pancreatic adenocarcinoma patients’ tissues. The overall transcriptional profile of the ML and HS cells confirmed the formerly described mesenchymal features of ML and epithelial nature of HS which was further verified via high expression of E-cadherin and low expression of vimentin found in HS in comparison to ML. Among the predicted features between HS and ML was the involvement of miRNA-9 in this switch. Importantly, the bioinformatics analysis also revealed substantial number (n = 126) of altered transportome genes. Interestingly, three genes upregulated in PDAC tissue samples (GJB2, GJB5 and SLC38A6) were found to be also upregulated in ML and 3 down-regulated transportome genes (KCNQ1, TRPV6 and SLC4A) were also reduced in ML. Conclusion This reversible HS/ML in vitro system might help in understanding the pathophysiological impact of the transportome in the dedifferentiation process in pancreatic carcinogenesis. Furthermore, the HS/ML model represents a novel system for studying the role of the transportome during the switch from a more benign, differentiated (HS) to a highly malignant, undifferentiated (ML) phenotype.
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Affiliation(s)
- Doaa Tawfik
- Institute for Experimental Cancer Research, Christian-Albrechts-University of Kiel, Arnold-Heller Str. 3, 24105, Kiel, Germany
| | - Angela Zaccagnino
- Institute for Experimental Cancer Research, Christian-Albrechts-University of Kiel, Arnold-Heller Str. 3, 24105, Kiel, Germany
| | - Alexander Bernt
- Institute for Experimental Cancer Research, Christian-Albrechts-University of Kiel, Arnold-Heller Str. 3, 24105, Kiel, Germany
| | - Monika Szczepanowski
- Clinic for Internal Medicine II, Christian-Albrechts-University of Kiel, UKSH, Kiel, Germany
| | - Wolfram Klapper
- Institute of Pathology, Hematopathology Section and Lymph Node Registry, Christian-Albrechts-University of Kiel, UKSH, Kiel, Germany
| | - Albrecht Schwab
- Institute of Physiology II, Westfälische Wilhelms-Universität, Münster, Germany
| | - Holger Kalthoff
- Institute for Experimental Cancer Research, Christian-Albrechts-University of Kiel, Arnold-Heller Str. 3, 24105, Kiel, Germany
| | - Anna Trauzold
- Institute for Experimental Cancer Research, Christian-Albrechts-University of Kiel, Arnold-Heller Str. 3, 24105, Kiel, Germany.
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17
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Cao L, Yuan Z, Liu M, Stock C. (Patho-)Physiology of Na +/H + Exchangers (NHEs) in the Digestive System. Front Physiol 2020; 10:1566. [PMID: 32009977 PMCID: PMC6974801 DOI: 10.3389/fphys.2019.01566] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 12/12/2019] [Indexed: 02/06/2023] Open
Abstract
Na+/H+ exchangers (NHEs) are expressed in virtually all human tissues and organs. Two major tasks of those NHE isoforms that are located in plasma membranes are cell volume control by Na+-uptake and cellular pH regulation by H+-extrusion. Several NHEs, particularly NHE 1–4 and 8, are involved in the pathogenesis of diseases of the digestive system such as inflammatory bowel disease (ulcerative colitis, Crohn’s disease) and gastric and colorectal tumorigenesis. In the present review, we describe the physiological purposes, possible malfunctions and pathophysiological effects of the different NHE isoforms along the alimentary canal from esophagus to colon, including pancreas, liver and gallbladder. Particular attention is paid to the functions of NHEs in injury repair and to the role of NHE1 in Barrett’s esophagus. The impact of NHEs on gut microbiota and intestinal mucosal integrity is also dealt with. As the hitherto existing findings are not always consistent, sometimes even controversial, they are compared and critically discussed.
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Affiliation(s)
- Li Cao
- Department of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhenglin Yuan
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Mei Liu
- Department of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Christian Stock
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hanover, Germany
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18
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Lee D, Hong JH. The Fundamental Role of Bicarbonate Transporters and Associated Carbonic Anhydrase Enzymes in Maintaining Ion and pH Homeostasis in Non-Secretory Organs. Int J Mol Sci 2020; 21:ijms21010339. [PMID: 31947992 PMCID: PMC6981687 DOI: 10.3390/ijms21010339] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/02/2020] [Accepted: 01/03/2020] [Indexed: 12/18/2022] Open
Abstract
The bicarbonate ion has a fundamental role in vital systems. Impaired bicarbonate transport leads to various diseases, including immune disorders, cystic fibrosis, tumorigenesis, kidney diseases, brain dysfunction, tooth fracture, ischemic reperfusion injury, hypertension, impaired reproductive system, and systemic acidosis. Carbonic anhydrases are involved in the mechanism of bicarbonate movement and consist of complex of bicarbonate transport systems including bicarbonate transporters. This review focused on the convergent regulation of ion homeostasis through various ion transporters including bicarbonate transporters, their regulatory enzymes, such as carbonic anhydrases, pH regulatory role, and the expression pattern of ion transporters in non-secretory systems throughout the body. Understanding the correlation between these systems will be helpful in order to obtain new insights and design potential therapeutic strategies for the treatment of pH-related disorders. In this review, we have discussed the broad prospects and challenges that remain in elucidation of bicarbonate-transport-related biological and developmental systems.
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Affiliation(s)
| | - Jeong Hee Hong
- Correspondence: ; Tel.: +82-32-899-6682; Fax: +82-32-899-6039
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19
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Chen X, Yu Q, Liu Y, Sheng Q, Shi K, Wang Y, Li M, Zhang Z, He Q. Synergistic cytotoxicity and co-autophagy inhibition in pancreatic tumor cells and cancer-associated fibroblasts by dual functional peptide-modified liposomes. Acta Biomater 2019; 99:339-349. [PMID: 31499197 DOI: 10.1016/j.actbio.2019.09.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 08/17/2019] [Accepted: 09/04/2019] [Indexed: 12/12/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDA) is a highly fatal disease with 5-year survival of ∼8.5%. Nanoplatforms such as nab-paclitaxel and nanoliposomal irinotecan demonstrate superiority and utility in treating different progressions of PDA by prolonging the median overall survival by only a few months. Due to the dense surrounding stroma and the high autophagy in pancreatic cancer, integrin ɑvβ3 targeting, acid environmental sensitive, TR peptide-modified liposomal platforms loaded with combined autophagy inhibiting hydroxychloroquine (HCQ), and cytotoxic paclitaxel (PTX) were designed (TR-PTX/HCQ-Lip) to accomplish the aim of synergistically killing tumor cells while inhibiting stroma fibrosis. The results showed that TR peptide-modified liposomes (TR-Lip) have superior targeting and penetrating effects both in vitro and in vivo. TR-PTX/HCQ-Lip efficiently inhibited autophagy in pancreatic cells and surrounding cancer-associated fibroblasts. The synergistic anti-fibrosis roles were also confirmed both in vitro and in vivo, all of which contributes to the enhanced curative effects of TR-PTX/HCQ-Lip in both heterogenetic and orthotopic pancreatic cancer models. STATEMENT OF SIGNIFICANCE: Autophagy plays a significant role in pancreatic ductal adenocarcinoma, especially in activating cancer associated fibroblasts which is also related to collagen generation that promotes the formation of dense stroma, which hinder the cytotoxic drugs to target and kill cancer cells. In this study, we designed integrin ɑvβ3 targeting, acid environmental sensitive liposomal platforms to co-loaded paclitaxel and the autophagy inhibitor hydroxychloroquine. The results showed that the muti-functional liposomes can target to the pancreatic tumor and efficiently kill tumor cells and inhibit stroma fibrosis, thus improve the therapeutic effect in orthotopic pancreatic cancer models.
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Affiliation(s)
- Xiaoxiao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Qianwen Yu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Yinke Liu
- West China School of Stomotology, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu 610041, PR China
| | - Qinglin Sheng
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Kairong Shi
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Yang Wang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Man Li
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Zhirong Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China
| | - Qin He
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy Sichuan University, Chengdu 610064, PR China.
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20
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Pedersen SF, Counillon L. The SLC9A-C Mammalian Na +/H + Exchanger Family: Molecules, Mechanisms, and Physiology. Physiol Rev 2019; 99:2015-2113. [PMID: 31507243 DOI: 10.1152/physrev.00028.2018] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Na+/H+ exchangers play pivotal roles in the control of cell and tissue pH by mediating the electroneutral exchange of Na+ and H+ across cellular membranes. They belong to an ancient family of highly evolutionarily conserved proteins, and they play essential physiological roles in all phyla. In this review, we focus on the mammalian Na+/H+ exchangers (NHEs), the solute carrier (SLC) 9 family. This family of electroneutral transporters constitutes three branches: SLC9A, -B, and -C. Within these, each isoform exhibits distinct tissue expression profiles, regulation, and physiological roles. Some of these transporters are highly studied, with hundreds of original articles, and some are still only rudimentarily understood. In this review, we present and discuss the pioneering original work as well as the current state-of-the-art research on mammalian NHEs. We aim to provide the reader with a comprehensive view of core knowledge and recent insights into each family member, from gene organization over protein structure and regulation to physiological and pathophysiological roles. Particular attention is given to the integrated physiology of NHEs in the main organ systems. We provide several novel analyses and useful overviews, and we pinpoint main remaining enigmas, which we hope will inspire novel research on these highly versatile proteins.
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Affiliation(s)
- S F Pedersen
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark; and Université Côte d'Azur, CNRS, Laboratoire de Physiomédecine Moléculaire, LP2M, France, and Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
| | - L Counillon
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark; and Université Côte d'Azur, CNRS, Laboratoire de Physiomédecine Moléculaire, LP2M, France, and Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
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21
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Yang OCY, Loh SH. Acidic Stress Triggers Sodium-Coupled Bicarbonate Transport and Promotes Survival in A375 Human Melanoma Cells. Sci Rep 2019; 9:6858. [PMID: 31048755 PMCID: PMC6497716 DOI: 10.1038/s41598-019-43262-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 04/18/2019] [Indexed: 12/27/2022] Open
Abstract
Melanoma cells preserve intracellular pH (pHi) within a viable range despite an acidic ambient pH that typically falls below pH 7.0. The molecular mechanisms underlying this form of acidic preservation in melanoma remain poorly understood. Previous studies had demonstrated that proton transporters including the monocarboxylate transporter (MCT), the sodium hydrogen exchanger (NHE), and V-Type ATPase mediate acid extrusion to counter intracellular acidification in melanoma cells. In this report, the expression and function of the Sodium-Coupled Bicarbonate Transporter (NCBT) family of base loaders were further characterized in melanoma cell lines. NCBT family members were found to be expressed in three different melanoma cell lines – A375, MeWo, and HS695T – and included the electrogenic sodium-bicarbonate cotransporter isoforms 1 and 2 (NBCe1 and NBCe2), the electroneutral sodium-bicarbonate cotransporter (NBCn1), and the sodium-dependent chloride-bicarbonate exchanger (NDCBE). These transporters facilitated 4,4′-diisothiocyanatostilbene-2,2′-disulfonic acid (DIDS)-dependent pHi recovery in melanoma cells, in response to intracellular acidification induced by ammonium chloride prepulse. Furthermore, the expression of NCBTs were upregulated via chronic exposure to extracellular acidification. Given the current research interest in the NCBTs as a molecular driver of tumourigenesis, characterising NCBT in melanoma provides impetus for developing novel therapeutic targets for melanoma treatment.
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Affiliation(s)
- Oscar C Y Yang
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, United Kingdom.,Department of Pharmacology, National Defense Medical Center, Taipei, Taiwan
| | - Shih-Hurng Loh
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, United Kingdom. .,Department of Pharmacology, National Defense Medical Center, Taipei, Taiwan. .,Department of Pharmacy Practice, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
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22
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Zaccagnino A, Managò A, Leanza L, Gontarewitz A, Linder B, Azzolini M, Biasutto L, Zoratti M, Peruzzo R, Legler K, Trauzold A, Kalthoff H, Szabo I. Tumor-reducing effect of the clinically used drug clofazimine in a SCID mouse model of pancreatic ductal adenocarcinoma. Oncotarget 2018; 8:38276-38293. [PMID: 27542263 PMCID: PMC5503532 DOI: 10.18632/oncotarget.11299] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 07/09/2016] [Indexed: 12/11/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) represents the most common form of pancreatic cancer with rising incidence in developing countries. Unfortunately, the overall 5-year survival rate is still less than 5%. The most frequent oncogenic mutations in PDAC are loss-of function mutations in p53 and gain-of-function mutations in KRAS. Here we show that clofazimine (Lamprene), a drug already used in the clinic for autoimmune diseases and leprosy, is able to efficiently kill in vitro five different PDAC cell lines harboring p53 mutations. We provide evidence that clofazimine induces apoptosis in PDAC cells with an EC50 in the μM range via its specific inhibitory action on the potassium channel Kv1.3. Intraperitoneal injection of clofazimine resulted in its accumulation in the pancreas of mice 8 hours after administration. Using an orthotopic PDAC xenotransplantation model in SCID beige mouse, we show that clofazimine significantly and strongly reduced the primary tumor weight. Thus, our work identifies clofazimine as a promising therapeutic agent against PDAC and further highlights ion channels as possible oncological targets.
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Affiliation(s)
- Angela Zaccagnino
- Institute for Experimental Cancer Research, Medical Faculty, CAU, Kiel, Arnold-Heller-Strasse 3 (Haus 17) D-24105 Kiel, Germany
| | - Antonella Managò
- Department of Biology, University of Padova, viale G. Colombo 3. Padova, I-35121 Italy
| | - Luigi Leanza
- Department of Biology, University of Padova, viale G. Colombo 3. Padova, I-35121 Italy
| | - Artur Gontarewitz
- Institute for Experimental Cancer Research, Medical Faculty, CAU, Kiel, Arnold-Heller-Strasse 3 (Haus 17) D-24105 Kiel, Germany
| | - Bernhard Linder
- Institute for Experimental Cancer Research, Medical Faculty, CAU, Kiel, Arnold-Heller-Strasse 3 (Haus 17) D-24105 Kiel, Germany
| | - Michele Azzolini
- Department of Biomedical Sciences, University of Padova, I-35121 Italy.,CNR Institute of Neuroscience, Padova, Italy
| | - Lucia Biasutto
- Department of Biomedical Sciences, University of Padova, I-35121 Italy.,CNR Institute of Neuroscience, Padova, Italy
| | - Mario Zoratti
- Department of Biomedical Sciences, University of Padova, I-35121 Italy.,CNR Institute of Neuroscience, Padova, Italy
| | - Roberta Peruzzo
- Department of Biology, University of Padova, viale G. Colombo 3. Padova, I-35121 Italy
| | - Karen Legler
- Institute for Experimental Cancer Research, Medical Faculty, CAU, Kiel, Arnold-Heller-Strasse 3 (Haus 17) D-24105 Kiel, Germany
| | - Anna Trauzold
- Institute for Experimental Cancer Research, Medical Faculty, CAU, Kiel, Arnold-Heller-Strasse 3 (Haus 17) D-24105 Kiel, Germany
| | - Holger Kalthoff
- Institute for Experimental Cancer Research, Medical Faculty, CAU, Kiel, Arnold-Heller-Strasse 3 (Haus 17) D-24105 Kiel, Germany
| | - Ildiko Szabo
- Department of Biology, University of Padova, viale G. Colombo 3. Padova, I-35121 Italy.,CNR Institute of Neuroscience, Padova, Italy
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23
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Hao G, Xu ZP, Li L. Manipulating extracellular tumour pH: an effective target for cancer therapy. RSC Adv 2018; 8:22182-22192. [PMID: 35541713 PMCID: PMC9081285 DOI: 10.1039/c8ra02095g] [Citation(s) in RCA: 180] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 06/07/2018] [Indexed: 12/12/2022] Open
Abstract
The pH in tumour cells and the tumour microenvironment has played important roles in cancer development and treatment.
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Affiliation(s)
- Guanyu Hao
- Australian Institute for Bioengineering and Nanotechnology (AIBN)
- The University of Queensland
- Brisbane
- Australia 4072
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology (AIBN)
- The University of Queensland
- Brisbane
- Australia 4072
| | - Li Li
- Australian Institute for Bioengineering and Nanotechnology (AIBN)
- The University of Queensland
- Brisbane
- Australia 4072
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24
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Dovmark TH, Hulikova A, Niederer SA, Vaughan-Jones RD, Swietach P. Normoxic cells remotely regulate the acid-base balance of cells at the hypoxic core of connexin-coupled tumor growths. FASEB J 2017; 32:83-96. [PMID: 28883041 DOI: 10.1096/fj.201700480r] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 08/14/2017] [Indexed: 12/19/2022]
Abstract
ATP fuels the removal of metabolic end-products, including H+ ions that profoundly modulate biological activities. Energetic resources in hypoxic tumor regions are constrained by low-yielding glycolysis, and any means of reducing the cost of acid extrusion, without compromising pH homeostasis, would therefore be advantageous for cancer cells. Some cancers express connexin channels that allow solute exchange between cells, and we propose that, via this route, normoxic cells supply hypoxic neighbors with acid-neutralizing HCO3- ions. This hypothesis was tested by imaging cytoplasmic pH in spheroidal tissue growths of connexin43-positive pancreatic cancer Colo357 cells during light-controlled H+ uncaging at the hypoxic core. Cytoplasmic acid retention at the core was halved in the presence of CO2/HCO3-, but this process requires a restorative HCO3- flux. The effect of CO2/HCO3- was ablated by connexin43 inhibition or knockdown. In connexin-decoupled spheroids, 4,4'-diisothiocyano-2,2'-stilbenedisulfonic acid (DIDS), an inhibitor of HCO3- uptake, had no effect on cytoplasmic [H+] in the H+-uncaging region, indicating that DIDS-sensitive transport is not an adequate pH-regulatory strategy therein. With intact connexin-coupling, acid retention at the core increased upon DIDS treatment, indicating that HCO3- ions are taken up actively by peripheral cells and then transmitted passively to cells at the hypoxic core. Thus, the energetic burden of pH regulation is offloaded from hypoxic cells onto metabolically altruistic normoxic neighbors.-Dovmark, T. H., Hulikova, A., Niederer, S. A., Vaughan-Jones, R. D., Swietach, P. Normoxic cells remotely regulate the acid-base balance of cells at the hypoxic core of connexin-coupled tumor growths.
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Affiliation(s)
- Tobias H Dovmark
- Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, United Kingdom, and
| | - Alzbeta Hulikova
- Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, United Kingdom, and
| | - Steven A Niederer
- Division of Imaging Sciences and Biomedical Engineering, St. Thomas' Hospital, London, United Kingdom
| | - Richard D Vaughan-Jones
- Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, United Kingdom, and
| | - Pawel Swietach
- Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, United Kingdom, and
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Lin S, Lin B, Wang X, Pan Y, Xu Q, He JS, Gong W, Xing R, He Y, Guo L, Lu Y, Wang JM, Huang J. Silencing of ATP4B of ATPase H +/K + Transporting Beta Subunit by Intragenic Epigenetic Alteration in Human Gastric Cancer Cells. Oncol Res 2017; 25:317-329. [PMID: 28281974 PMCID: PMC7840950 DOI: 10.3727/096504016x14734735156265] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The ATPase H+/K+ Transporting Beta Subunit (ATP4B) encodes the β subunit of the gastric H+, K+-ATPase, which controls gastric acid secretion and is therefore a target for acid reduction. Downregulation of ATP4B was recently observed in human gastric cancer (GC) without known mechanisms. In the present study, we demonstrated that ATP4B expression was decreased in human GC tissues and cell lines associated with DNA hypermethylation and histone hypoacetylation of histone H3 lysine 9 at its intragenic region close to the transcriptional start site. The expression of ATP4B was restored in GC cell lines by treatment with the DNA methyltransferase inhibitor, 5-aza-2'-deoxycytidine (5-AZA), or histone deacetylase inhibitor, trichostatin A (TSA), with further enhancement by combined treatment with both drugs. In contrast, 5-AZA had no effect on ATP4B expression in human hepatocellular carcinoma (HCC) and pancreatic cancer cell lines, in which ATP4B was silenced and accompanied by intragenic methylation. Chromatin immunoprecipitation (ChIP) showed that, in BGC823 GC cells, histone H3 lysine 9 acetylation (H3K9ac) was enhanced in the intragenic region of ATP4B upon TSA treatment, whereas 5-AZA showed a minimal effect. Additionally, ATP4B expression enhanced the inhibitory effects of chemotherapeutic mediation docetaxel on GC cell growth. Thus, as opposed to HCC and pancreatic cancer cells, the silencing of ATP4B in GC cells is attributable to the interplay between intragenic DNA methylation and histone acetylation of ATP4B, the restoration of which is associated with a favorable anticancer effect of docetaxel. These results have implications for targeting epigenetic alteration at the intragenic region of ATP4B in GC cells to benefit diagnosis and treatment of GC.
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Affiliation(s)
- Shuye Lin
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
- †Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - Bonan Lin
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
| | - Xiaoyue Wang
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
| | - Yuanming Pan
- ‡Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital/Institute, Beijing, P.R. China
| | - Qing Xu
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
| | - Jin-Shen He
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
| | - Wanghua Gong
- §Basic Research Program, Leidos Biomedical Research, Inc., Frederick, MD, USA
| | - Rui Xing
- ‡Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital/Institute, Beijing, P.R. China
| | - Yuqi He
- ¶Department of Gastroenterology, PLA Army General Hospital, Beijing, P.R. China
| | - Lihua Guo
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
| | - Youyong Lu
- ‡Laboratory of Molecular Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital/Institute, Beijing, P.R. China
| | - Ji Ming Wang
- †Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - Jiaqiang Huang
- *College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing, P.R. China
- †Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
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26
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Zeng N, Zhou Y, Zhang S, Singh Y, Shi B, Salker MS, Lang F. 1α,25(OH) 2D3 Sensitive Cytosolic pH Regulation and Glycolytic Flux in Human Endometrial Ishikawa Cells. Cell Physiol Biochem 2017; 41:678-688. [PMID: 28222424 DOI: 10.1159/000458427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 01/15/2017] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND/AIMS Tumor cell proliferation is modified by 1,25-Dihydroxy-Vitamin D3 (1,25(OH)2D3), a steroid hormone predominantly known for its role in calcium and phosphorus metabolism. Key properties of tumor cells include enhanced glycolytic flux with excessive consumption of glucose and formation of lactate. As glycolysis is highly sensitive to cytosolic pH, maintenance of glycolysis requires export of H+ ions and lactate, which is in part accomplished by Na+/H+ exchangers, such as NHE1 and monocarboxylate transporters, such as MCT4. An effect of 1,25(OH)2D3 on those transport processes has, however, never been reported. As cytosolic pH impacts on apoptosis, the study further explored the effect of 1,25(OH)2D3 on apoptosis and on the apoptosis regulating kinase AKT, transcription factor Forkhead box O-3 (FOXO3A) and B-cell lymphoma protein BCL-2. METHODS In human endometrial adenocarcinoma (Ishikawa) cells, cytosolic pH (pHi) was determined utilizing (2',7'-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein [BCECF] fluorescence, Na+/H+ exchanger activity from Na+ dependent realkalinization after an ammonium pulse, NHE1 and MCT4 transcript levels using qRT-PCR, NHE1, MCT4, total & phospho AKT, total & phospho-FOXO3A and BCL-2 protein abundance by Western blotting, lactate concentration in the supernatant utilizing a colorimetric enzyme assay and cell death quantification using CytoTox 96®, Annexin V and Propidium Iodide staining. RESULTS A 24 hours treatment with 1,25(OH)2D3 (100 nM) significantly increased cytosolic pH (pHi), significantly decreased Na+/H+ exchanger activity, NHE1 and MCT4 transcript levels as well as protein abundance and significantly increased lactate concentration in the supernatant. Treatment of Ishikawa cells with 1,25(OH)2D3 (100 nM) further triggered apoptosis, an effect paralleled by decreased phosphorylation of AKT and FOXO3A as well as decreased abundance of BCL-2. CONCLUSIONS In Ishikawa cells 1,25(OH)2D3 is a powerful stimulator of glycolysis, an effect presumably due to cytosolic alkalinization. Despite stimulation of glycolysis, 1,25(OH)2D3 stimulates slightly but significantly suicidal cell death, an effect presumably in part due to decreased activation of AKT with decreased inhibition of pro-apoptotic transcription factor FOXO3A and downregulation of the anti-apoptotic protein BCL-2.
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27
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Amith SR, Fliegel L. Na +/H + exchanger-mediated hydrogen ion extrusion as a carcinogenic signal in triple-negative breast cancer etiopathogenesis and prospects for its inhibition in therapeutics. Semin Cancer Biol 2017; 43:35-41. [PMID: 28104391 DOI: 10.1016/j.semcancer.2017.01.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 01/09/2017] [Accepted: 01/10/2017] [Indexed: 12/17/2022]
Abstract
Breast cancer is the leading cause of cancer-related death in women in Europe and North America, and metastasis is the primary cause of fatality in patients with breast cancer. While some breast cancers are quite treatable, the triple-negative breast cancers are more metastatic and resistant to chemotherapy. There is clearly an urgent need for better treatments for this form of the disease. Breast cancer is characterized by genetically complex intra-tumour heterogeneity, particularly within the triple-negative clinical subtype. This complicates treatment options, so the development of specifically targeted chemotherapy for less treatable forms is critical. Dysregulation of pH homeostasis is a common factor in breast tumour cells. This occurs in concert with a metabolic switch to aerobic glycolysis that occurs at the onset of oncogenic transformation. The Na+/H+ exchanger isoform 1 (NHE1) is the major pH regulatory protein involved in the increased proton extrusion of breast cancer cells. Its increased activity results in intracellular alkalinisation and extracellular acidification that drives cancer progression. The acidification of the extracellular tumour microenvironment also contributes to the development of chemotherapy resistance. In this review, we outline the role of H+ as a carcinogenic signal and the role and regulation of NHE1 as a trigger for metastasis. We review recent evidence supporting the use of pharmacological inhibitors of NHE1 as a viable treatment option for triple-negative breast cancer.
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Affiliation(s)
- Schammim Ray Amith
- Biomedical Science, School of Life Sciences, Keele University, 103B Huxley Building, Keele, Staffordshire, ST5 5BG, United Kingdom.
| | - Larry Fliegel
- Department of Biochemistry, University of Alberta, 347 Medical Sciences Building, Edmonton, Alberta, T6G 2H7, Canada.
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28
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Stock C, Pedersen SF. Roles of pH and the Na +/H + exchanger NHE1 in cancer: From cell biology and animal models to an emerging translational perspective? Semin Cancer Biol 2016; 43:5-16. [PMID: 28007556 DOI: 10.1016/j.semcancer.2016.12.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 12/10/2016] [Indexed: 01/30/2023]
Abstract
Acidosis is characteristic of the solid tumor microenvironment. Tumor cells, because they are highly proliferative and anabolic, have greatly elevated metabolic acid production. To sustain a normal cytosolic pH homeostasis they therefore need to either extrude excess protons or to neutralize them by importing HCO3-, in both cases causing extracellular acidification in the poorly perfused tissue microenvironment. The Na+/H+ exchanger isoform 1 (NHE1) is a ubiquitously expressed acid-extruding membrane transport protein, and upregulation of its expression and/or activity is commonly correlated with tumor malignancy. The present review discusses current evidence on how altered pH homeostasis, and in particular NHE1, contributes to tumor cell motility, invasion, proliferation, and growth and facilitates evasion of chemotherapeutic cell death. We summarize data from in vitro studies, 2D-, 3D- and organotypic cell culture, animal models and human tissue, which collectively point to pH-regulation in general, and NHE1 in particular, as potential targets in combination chemotherapy. Finally, we discuss the possible pitfalls, side effects and cellular escape mechanisms that need to be considered in the process of translating the plethora of basic research data into a clinical setting.
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Affiliation(s)
- Christian Stock
- Department of Gastroenterology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Stine Falsig Pedersen
- Department of Biology, Section for Cell Biology and Physiology, University of Copenhagen, Universitetsparken 13, 2100 Copenhagen, Denmark.
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29
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Zaccagnino A, Pilarsky C, Tawfik D, Sebens S, Trauzold A, Novak I, Schwab A, Kalthoff H. In silico analysis of the transportome in human pancreatic ductal adenocarcinoma. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2016; 45:749-763. [PMID: 27652669 DOI: 10.1007/s00249-016-1171-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 07/18/2016] [Accepted: 08/30/2016] [Indexed: 12/14/2022]
Abstract
The altered expression and/or activity of ion channels and transporters (transportome) have been associated with malignant behavior of cancer cells and were proposed to be a hallmark of cancer. However, the impact of altered transportome in epithelial cancers, such as pancreatic ductal adenocarcinoma (PDAC), as well as its pathophysiological consequences, still remains unclear. Here, we report the in silico analysis of 840 transportome genes in PDAC patients' tissues. Our study was focused on the transportome changes and their correlation with functional and behavioral responses in PDAC tumor and stromal compartments. The dysregulated gene expression datasets were filtered using a cut-off of fold-change values ≤-2 or ≥2 (adjusted p value ≤0.05). The dysregulated transportome genes were clearly associated with impaired physiological secretory mechanisms and/or pH regulation, control of cell volume, and cell polarity. Additionally, some down-regulated transportome genes were found to be closely linked to epithelial cell differentiation. Furthermore, the observed decrease in genes coding for calcium and chloride transport might be a mechanism for evasion of apoptosis. In conclusion, the current work provides a comprehensive overview of the altered transportome expression and its association with predicted PDAC malignancy with special focus on the epithelial compartment.
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Affiliation(s)
- A Zaccagnino
- Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel, UKSH, Campus Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Germany.
| | - C Pilarsky
- Department of Surgery, University Clinic, Krankenhausstr. 12, 91054, Erlangen, Germany
| | - D Tawfik
- Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel, UKSH, Campus Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Germany
| | - S Sebens
- Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel, UKSH, Campus Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Germany
| | - A Trauzold
- Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel, UKSH, Campus Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Germany
| | - I Novak
- Section for Cell Biology and Physiology, Department of Biology, Faculty of Science, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen, Denmark
| | - A Schwab
- Institute of Physiology II, University of Muenster, Robert-Koch-Str. 27 b, 48149, Muenster, Germany
| | - H Kalthoff
- Institute for Experimental Cancer Research, Christian-Albrechts-University Kiel, UKSH, Campus Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Germany.
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30
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Monocarboxylate Transporters MCT1 and MCT4 Regulate Migration and Invasion of Pancreatic Ductal Adenocarcinoma Cells. Pancreas 2016; 45:1036-47. [PMID: 26765963 DOI: 10.1097/mpa.0000000000000571] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVES Novel treatments for pancreatic ductal adenocarcinoma (PDAC) are severely needed. The aim of this work was to explore the roles of H-lactate monocarboxylate transporters 1 and 4 (MCT1 and MCT4) in PDAC cell migration and invasiveness. METHODS Monocarboxylate transporter expression, localization, activity, and function were explored in human PDAC cells (MIAPaCa-2, Panc-1, BxPC-3, AsPC-1) and normal human pancreatic ductal epithelial (HPDE) cells, by quantitative polymerase chain reaction, immunoblotting, immunocytochemistry, lactate flux, migration, and invasion assays. RESULTS MCT1 and MCT4 (messenger RNA, protein) were robustly expressed in all PDAC lines, localizing to the plasma membrane. Lactate influx capacity was highest in AsPC-1 cells and lowest in HPDE cells and was inhibited by the MCT inhibitor α-cyano-4-hydroxycinnamate (4-CIN), MCT1/MCT2 inhibitor AR-C155858, or knockdown of MCT1 or MCT4. PDAC cell migration was largely unaffected by MCT1/MCT2 inhibition or MCT1 knockdown but was reduced by 4-CIN and by MCT4 knockdown (BxPC-3). Invasion measured in Boyden chamber (BxPC-3, Panc-1) and spheroid outgrowth (BxPC-3) assays was attenuated by 4-CIN and AR-C155858 and by MCT1 or MCT4 knockdown. CONCLUSIONS Human PDAC cells exhibit robust MCT1 and MCT4 expression and partially MCT1- and MCT4-dependent lactate flux. PDAC cell migration is partially dependent on MCT4; and invasion, on MCT1 and MCT4. Inhibition of MCT1 and MCT4 may have clinical relevance in PDAC.
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Andersen AP, Flinck M, Oernbo EK, Pedersen NB, Viuff BM, Pedersen SF. Roles of acid-extruding ion transporters in regulation of breast cancer cell growth in a 3-dimensional microenvironment. Mol Cancer 2016; 15:45. [PMID: 27266704 PMCID: PMC4896021 DOI: 10.1186/s12943-016-0528-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 05/20/2016] [Indexed: 12/20/2022] Open
Abstract
Background The 3-dimensional (3D) microenvironment of breast carcinomas is characterized by profoundly altered pH homeostasis, reflecting increased metabolic acid production and a confined extracellular space characterized by poor diffusion, yet the relative contributions of specific pH-regulatory transporters to 3D growth are poorly understood. The aim of this work was to determine how 3D spheroid growth of breast cancer cells impacts the expression and spatial organization of major acid extruding proteins, and how these proteins in turn are required for spheroid growth. Methods MCF-7 (Luminal-A) and MDA-MB-231 (Triple-negative) human breast cancer cells were grown as ~700-950 μm diameter spheroids, which were subjected to Western blotting for relevant transporters (2- and 3D growth), quantitative immunohistochemical analysis, and spheroid growth assays. Individual transporter contributions were assessed (i) pharmacologically, (ii) by stable shRNA- and transient siRNA-mediated knockdown, and (iii) by CRISPR/Cas9 knockout. Results In MCF-7 spheroids, expression of the lactate-H+ cotransporter MCT1 (SLC16A1) increased from the spheroid periphery to its core, the Na+,HCO3− cotransporter NBCn1 (SLC4A7) was most highly expressed at the periphery, and the Na+/H+ exchanger NHE1 (SLC9A1) and MCT4 (SLC16A3) were evenly distributed. A similar pattern was seen in MDA-MB-231 spheroids, except that these cells do not express MCT1. The relative total expression of NBCn1 and NHE1 was decreased in 3D compared to 2D, while that of MCT1 and MCT4 was unaltered. Inhibition of MCT1 (AR-C155858) attenuated MCF-7 spheroid growth and this was exacerbated by addition of S0859, an inhibitor of Na+,HCO3− cotransporters and MCTs. The pharmacological data was recapitulated by stable knockdown of MCT1 or NBCn1, whereas knockdown of MCT4 had no effect. CRISPR/Cas9 knockout of NHE1, but neither partial NHE1 knockdown nor the NHE1 inhibitor cariporide, inhibited MCF-7 spheroid growth. In contrast, growth of MDA-MB-231 spheroids was inhibited by stable or transient NHE1 knockdown and by NHE1 knockout, but not by knockdown of NBCn1 or MCT4. Conclusions This work demonstrates the distinct expression and localization patterns of four major acid-extruding transporters in 3D spheroids of human breast cancer cells and reveals that 3D growth is dependent on these transporters in a cell type-dependent manner, with potentially important implications for breast cancer therapy. Electronic supplementary material The online version of this article (doi:10.1186/s12943-016-0528-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Anne Poder Andersen
- Department of Biology, Section for Cell Biology and Physiology, Faculty of Science, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark
| | - Mette Flinck
- Department of Biology, Section for Cell Biology and Physiology, Faculty of Science, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark
| | - Eva Kjer Oernbo
- Department of Biology, Section for Cell Biology and Physiology, Faculty of Science, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark
| | - Nis Borbye Pedersen
- Department of Biology, Section for Cell Biology and Physiology, Faculty of Science, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark
| | - Birgitte Martine Viuff
- Department of Veterinary Disease Biology, Section for Molecular Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Strandboulevarden 49, DK-2100, Copenhagen, Denmark
| | - Stine Falsig Pedersen
- Department of Biology, Section for Cell Biology and Physiology, Faculty of Science, University of Copenhagen, Universitetsparken 13, DK-2100, Copenhagen, Denmark.
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32
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Kv10.1 K+ channel: from physiology to cancer. Pflugers Arch 2016; 468:751-62. [DOI: 10.1007/s00424-015-1784-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 12/11/2015] [Accepted: 12/27/2015] [Indexed: 12/18/2022]
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33
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Kimbrough CW, Khanal A, Zeiderman M, Khanal BR, Burton NC, McMasters KM, Vickers SM, Grizzle WE, McNally LR. Targeting Acidity in Pancreatic Adenocarcinoma: Multispectral Optoacoustic Tomography Detects pH-Low Insertion Peptide Probes In Vivo. Clin Cancer Res 2015; 21:4576-85. [PMID: 26124201 PMCID: PMC4609270 DOI: 10.1158/1078-0432.ccr-15-0314] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 06/12/2015] [Indexed: 02/07/2023]
Abstract
BACKGROUND pH-low insertion peptides (pHLIP) can serve as a targeting moiety that enables pH-sensitive probes to detect solid tumors. Using these probes in conjunction with multispectral optoacoustic tomography (MSOT) is a promising approach to improve imaging for pancreatic cancer. METHODS A pH-sensitive pHLIP (V7) was conjugated to 750 NIR fluorescent dye and evaluated as a targeted probe for pancreatic adenocarcinoma. The pH-insensitive K7 pHLIP served as an untargeted control. Probe binding was assessed in vitro at pH 7.4, 6.8, and 6.6 using human pancreatic cell lines S2VP10 and S2013. Using MSOT, semiquantitative probe accumulation was then assessed in vivo with a murine orthotopic pancreatic adenocarcinoma model. RESULTS In vitro, the V7-750 probe demonstrated significantly higher fluorescence at pH 6.6 compared with pH 7.4 (S2VP10, P = 0.0119; S2013, P = 0.0160), whereas no difference was observed with the K7-750 control (S2VP10, P = 0.8783; S2013, P = 0.921). In the in vivo S2VP10 model, V7-750 probe resulted in 782.5 MSOT a.u. signal compared with 5.3 MSOT a.u. in K7-750 control in tumor (P = 0.0001). Similarly, V7-750 probe signal was 578.3 MSOT a.u. in the S2013 model compared with K7-750 signal at 5.1 MSOT a.u. (P = 0.0005). There was minimal off-target accumulation of the V7-750 probe within the liver or kidney, and probe distribution was confirmed with ex vivo imaging. CONCLUSIONS Compared with pH-insensitive controls, V7-750 pH-sensitive probe specifically targets pancreatic adenocarcinoma and has minimal off-target accumulation. The noninvasive detection of pH-targeted probes by means of MSOT represents a promising modality to improve the detection and monitoring of pancreatic cancer.
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Affiliation(s)
- Charles W Kimbrough
- The Hiram C. Polk Jr, MD Department of Surgery, University of Louisville, Louisville, Kentucky
| | - Anil Khanal
- Department of Medicine, University of Louisville, Louisville, Kentucky
| | - Matthew Zeiderman
- The Hiram C. Polk Jr, MD Department of Surgery, University of Louisville, Louisville, Kentucky
| | - Bigya R Khanal
- Department of Medicine, University of Louisville, Louisville, Kentucky
| | | | - Kelly M McMasters
- The Hiram C. Polk Jr, MD Department of Surgery, University of Louisville, Louisville, Kentucky
| | | | | | - Lacey R McNally
- Department of Medicine, University of Louisville, Louisville, Kentucky.
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Wang J, Barbuskaite D, Tozzi M, Giannuzzo A, Sørensen CE, Novak I. Proton Pump Inhibitors Inhibit Pancreatic Secretion: Role of Gastric and Non-Gastric H+/K+-ATPases. PLoS One 2015; 10:e0126432. [PMID: 25993003 PMCID: PMC4436373 DOI: 10.1371/journal.pone.0126432] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 04/02/2015] [Indexed: 02/07/2023] Open
Abstract
The mechanism by which pancreas secretes high HCO3- has not been fully resolved. This alkaline secretion, formed in pancreatic ducts, can be achieved by transporting HCO3- from serosa to mucosa or by moving H+ in the opposite direction. The aim of the present study was to determine whether H+/K+-ATPases are expressed and functional in human pancreatic ducts and whether proton pump inhibitors (PPIs) have effect on those. Here we show that the gastric HKα1 and HKβ subunits (ATP4A; ATP4B) and non-gastric HKα2 subunits (ATP12A) of H+/K+-ATPases are expressed in human pancreatic cells. Pumps have similar localizations in duct cell monolayers (Capan-1) and human pancreas, and notably the gastric pumps are localized on the luminal membranes. In Capan-1 cells, PPIs inhibited recovery of intracellular pH from acidosis. Furthermore, in rats treated with PPIs, pancreatic secretion was inhibited but concentrations of major ions in secretion follow similar excretory curves in control and PPI treated animals. In addition to HCO3-, pancreas also secretes K+. In conclusion, this study calls for a revision of the basic model for HCO3- secretion. We propose that proton transport is driving secretion, and that in addition it may provide a protective pH buffer zone and K+ recirculation. Furthermore, it seems relevant to re-evaluate whether PPIs should be used in treatment therapies where pancreatic functions are already compromised.
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Affiliation(s)
- Jing Wang
- Department of Biology, Section for Molecular Integrative Physiology, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
| | - Dagne Barbuskaite
- Department of Biology, Section for Molecular Integrative Physiology, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
| | - Marco Tozzi
- Department of Biology, Section for Molecular Integrative Physiology, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
| | - Andrea Giannuzzo
- Department of Biology, Section for Molecular Integrative Physiology, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
| | - Christiane E. Sørensen
- Department of Biology, Section for Molecular Integrative Physiology, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
| | - Ivana Novak
- Department of Biology, Section for Molecular Integrative Physiology, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
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LeftyA sensitive cytosolic pH regulation and glycolytic flux in Ishikawa human endometrial cancer cells. Biochem Biophys Res Commun 2015; 460:845-9. [PMID: 25838200 DOI: 10.1016/j.bbrc.2015.03.120] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 03/21/2015] [Indexed: 12/11/2022]
Abstract
OBJECTIVE LeftyA, a powerful regulator of stemness, embryonic differentiation, and reprogramming of cancer cells, counteracts cell proliferation and tumor growth. Key properties of tumor cells include enhanced glycolytic flux, which is highly sensitive to cytosolic pH and thus requires export of H(+) and lactate. H(+) extrusion is in part accomplished by Na(+)/H(+) exchangers, such as NHE1. An effect of LeftyA on transport processes has, however, never been reported. The present study thus explored whether LeftyA modifies regulation of cytosolic pH (pHi) in Ishikawa cells, a well differentiated endometrial carcinoma cell model. METHODS NHE1 transcript levels were determined by qRT-PCR, NHE1 protein abundance quantified by Western blotting, pHi estimated utilizing (2',7'-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein [BCECF] fluorescence, Na(+)/H(+) exchanger activity from Na(+) dependent realkalinization after an ammonium pulse, and lactate concentration in the supernatant utilizing an enzymatic assay and subsequent colorimetry. RESULTS A 2 h treatment with LeftyA (8 ng/ml) significantly decreased NHE1 transcript levels (by 99.6%), NHE1 protein abundance (by 71%), Na(+)/H(+) exchanger activity (by 55%), pHi (from 7.22 ± 0.02 to 7.05 ± 0.02), and lactate release (by 41%). CONCLUSIONS LeftyA markedly down-regulates NHE1 expression, Na(+)/H(+) exchanger activity, pHi, and lactate release in Ishikawa cells. Those effects presumably contribute to cellular reprogramming and growth inhibition.
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