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González-González L, González-Ramírez R, Flores A, Avelino-Cruz JE, Felix R, Monjaraz E. Epidermal Growth Factor Potentiates Migration of MDA-MB 231 Breast Cancer Cells by Increasing NaV1.5 Channel Expression. Oncology 2019; 97:373-382. [PMID: 31430760 DOI: 10.1159/000501802] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 06/27/2019] [Indexed: 12/24/2022]
Abstract
INTRODUCTION Breast cancer is one of the leading causes of death worldwide and is the result of dysregulation of various signaling pathways in mammary epithelial cells. The mortality rate in patients suffering from breast cancer is high because the tumor cells have a prominent invasive capacity towards the surrounding tissues. Previous studies carried out in tumor cell models show that voltage-gated ion channels may be important molecular actors that contribute to the migratory and invasive capacity of the tumor cells. METHODS In this study, by using an experimental strategy that combines cell and molecular biology assays with electrophysiological recording, we sought to determine whether the voltage-dependent sodium channel NaV1.5 regulates the migratory capacity of the human breast cancer cell line MDA-MB 231, when cells are maintained in the presence of epidermal growth factor (EGF), as an inductor of the epithelial-mesenchymal transition. RESULTS Our data show that EGF stimulates the migratory capacity of MDA-MB 231 cells, by regulating the functional expression of NaV1.5 channels. Consistent with this, the stimulatory actions of the growth factor were prevented by the use of tetrodotoxin, an Na+ channel selective blocker, as well as by resveratrol, an antioxidant that can also affect Na+ channel activity. DISCUSSION The understanding of molecular mechanisms, such as the EGF pathway in the progression of breast cancer is fundamental for the design of more effective therapeutic strategies for the disease.
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Affiliation(s)
| | - Ricardo González-Ramírez
- Department of Molecular Biology and Histocompatibility, Dr. Manuel Gea González General Hospital, Mexico City, Mexico
| | - Amira Flores
- Institute of Physiology, Meritorious Autonomous University of Puebla (BUAP), Puebla, Mexico
| | - José E Avelino-Cruz
- Institute of Physiology, Meritorious Autonomous University of Puebla (BUAP), Puebla, Mexico
| | - Ricardo Felix
- Department of Cell Biology, Center for Research and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN), Mexico City, Mexico,
| | - Eduardo Monjaraz
- Institute of Physiology, Meritorious Autonomous University of Puebla (BUAP), Puebla, Mexico
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2
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Sassano MF, Doak AK, Roth BL, Shoichet BK. Colloidal aggregation causes inhibition of G protein-coupled receptors. J Med Chem 2013; 56:2406-14. [PMID: 23437772 PMCID: PMC3613083 DOI: 10.1021/jm301749y] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
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Colloidal
aggregation is the dominant mechanism for artifactual
inhibition of soluble proteins, and controls against it are now widely
deployed. Conversely, investigating this mechanism for membrane-bound
receptors has proven difficult. Here we investigate the activity of
four well-characterized aggregators against three G protein-coupled
receptors (GPCRs) recognizing peptide and protein ligands. Each of
the aggregators was active at micromolar concentrations against the
three GPCRs in cell-based assays. This activity could be attenuated
by either centrifugation of the inhibitor stock solution or by addition
of Tween-80 detergent. In the absence of agonist, the aggregators
acted as inverse agonists, consistent with a direct receptor interaction.
Meanwhile, several literature GPCR ligands that resemble aggregators
themselves formed colloids, by both physical and enzymological tests.
These observations suggest that some GPCRs may be artifactually antagonized
by colloidal aggregates, an effect that merits the attention of investigators
in this field.
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Affiliation(s)
- Maria F Sassano
- Department of Pharmacology and the NIMH Psychoactive Drug Screening Program, University of North Carolina Chapel Hill School of Medicine , Chapel Hill, North Carolina 27759, USA
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3
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Gabriele B, Veltri L, Mancuso R, Salerno G, Maggi S, Aresta BM. A Palladium Iodide-Catalyzed Carbonylative Approach to Functionalized Pyrrole Derivatives. J Org Chem 2012; 77:4005-16. [DOI: 10.1021/jo300365n] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Bartolo Gabriele
- Dipartimento
di Scienze Farmaceutiche, Università della Calabria, 87036 Arcavacata
di Rende (CS), Italy
| | - Lucia Veltri
- Dipartimento
di Chimica, Università della Calabria, 87036 Arcavacata
di Rende (CS), Italy
| | - Raffaella Mancuso
- Dipartimento
di Chimica, Università della Calabria, 87036 Arcavacata
di Rende (CS), Italy
| | - Giuseppe Salerno
- Dipartimento
di Chimica, Università della Calabria, 87036 Arcavacata
di Rende (CS), Italy
| | - Sabino Maggi
- Istituto di Cristallografia, CNR, 70124 Via Amendola,
122/O, Bari, Italy
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4
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Chang HC, Cheng HH, Huang CJ, Chen WC, Chen IS, Liu SI, Hsu SS, Chang HT, Wang JK, Lu YC, Chou CT, Jan CR. Safrole-Induced Ca2+Mobilization and Cytotoxicity in Human PC3 Prostate Cancer Cells. J Recept Signal Transduct Res 2008; 26:199-212. [PMID: 16777715 DOI: 10.1080/10799890600662595] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The effect of the carcinogen safrole on intracellular Ca2+ mobilization and on viability of human PC3 prostate cancer cells was examined. Cytosolic free Ca2+ levels ([Ca2+]i) were measured by using fura-2 as a probe. Safrole at concentrations above 10 microM increased [Ca2+]i in a concentration-dependent manner with an EC50 value of 350 microM. The Ca2+ signal was reduced by more than half after removing extracellular Ca2+ but was unaffected by nifedipine, nicardipine, nimodipine, diltiazem, or verapamil. In Ca2+-free medium, after treatment with 650 microM safrole, 1 microM thapsigargin (an endoplasmic reticulum Ca2+ pump inhibitor) failed to release Ca2+. Neither inhibition of phospholipase C with U73122 nor modulation of protein kinase C activity affected safrole-induced Ca2+ release. Overnight incubation with 0.65-65 microM safrole did not affect cell viability, but incubation with 325-625 microM safrole decreased viability. Collectively, the data suggest that in PC3 cells, safrole induced a [Ca2+]i increase by causing Ca2+ release from the endoplasmic reticulum in a phospholipase C- and protein kinase C-independent fashion, and by inducing Ca2+ influx. Safrole can decrease cell viability in a concentration-dependent manner.
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Affiliation(s)
- H C Chang
- Department of Urology, College of Medicine, National Taiwan University, Taipei, Taiwan
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Carraway RE, Hassan S, Dobner PR. Protein kinase C inhibitors alter neurotensin receptor binding and function in prostate cancer PC3 cells. ACTA ACUST UNITED AC 2008; 147:96-109. [DOI: 10.1016/j.regpep.2008.01.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2007] [Revised: 11/30/2007] [Accepted: 01/31/2008] [Indexed: 01/02/2023]
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Abstract
This article discusses the use of nanotechnology in drug delivery approaches. Magnetic nanotechnology is finding wide applications in medicine, most notably in MRI and magnetic separation. The impedance biosensor is expected to find applications in monitoring cytokines in cancer, bone turnover markers in osteoporosis, and understanding neural-degenerative diseases.
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Affiliation(s)
- Chiming Wei
- Department of Surgery, Johns Hopkins University School of Medicine, 600 N. Wolfe Street/Harvey 606, Baltimore, MD 21205, USA.
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Letelier ME, Entrala P, López-Alarcón C, González-Lira V, Molina-Berríos A, Cortés-Troncoso J, Jara-Sandoval J, Santander P, Núñez-Vergara L. Nitroaryl-1,4-dihydropyridines as antioxidants against rat liver microsomes oxidation induced by iron/ascorbate, nitrofurantoin and naphthalene. Toxicol In Vitro 2007; 21:1610-8. [PMID: 17669617 DOI: 10.1016/j.tiv.2007.06.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2007] [Revised: 05/08/2007] [Accepted: 06/04/2007] [Indexed: 11/27/2022]
Abstract
1,4-Dihydropyridines (DHPs) used in the treatment of cardiovascular diseases, are calcium channel antagonists and also antioxidant agents. These drugs are metabolized through cytochrome P(450) oxidative system, majority localized in the hepatic endoplasmic reticulum. Several lipophilic drugs generate oxidative stress to be metabolized by this cellular system. Thus, DHP antioxidant properties may prevent the oxidative stress associated with hepatic biotransformation of drugs. In this work, we tested the antioxidant capacity of several synthetic nitro-phenyl-DHPs. These compounds (I-IV) inhibited the microsomal lipid peroxidation, UDPGT oxidative activation and microsomal thiols oxidation; all phenomena induced by Fe(3+)/ascorbate, a generator system of oxygen free radicals. As the same manner, these compounds inhibited the oxygen consumption induced by Cu(2+)/ascorbate in the absence of microsomes. Furthermore, compound III (2,6-dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridin-3,5-ethyl-dicarboxylate) and compound V (N-ethyl-2,6-dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridin-3,5-methyl-dicarboxylate) inhibited the microsomal lipid peroxidation induced by Nitrofurantoin and naphthalene in the presence of NADPH. Oxidative stress induced on endoplasmic reticulum may alter the biotransformation of drugs, so, modifying their plasmatic concentrations and therapeutic effects. When drugs which are activated by biotransformation are administered together with antioxidant drugs, such as DHPs, oxidative stress induced in situ may be prevented.
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Affiliation(s)
- María Eugenia Letelier
- Laboratory of Pharmacology, Department of Pharmacological and Toxicological Chemistry, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Olivos 1007, Independencia, Santiago, Chile.
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8
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Zhang X, Yin H, Cooper JM, Haswell SJ. A microfluidic-based system for analysis of single cells based on Ca2+ flux. Electrophoresis 2007; 27:5093-100. [PMID: 17117377 DOI: 10.1002/elps.200600390] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A microfluidic format-based system has been developed for in situ monitoring of the calcium flux response to agonists using Chinese hamster ovary (CHO) cells. The assay is based on measuring the fluorescent intensity of the calcium-sensitive indicator, Fluo-4 AM, and was performed in a modified glass chip channel, whose surface was functionalised using a silanisation method with 3-aminopropyltriethoxysilane (APTS) (enabling the cells to be immobilised on the channel surface). CHO cells calcium flux response was measured for different agonists over a range of concentrations. Cells and reagents were introduced into the chip in a continuous flow as a series of plugs in a given sequence.
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Affiliation(s)
- Xunli Zhang
- Department of Chemistry, The University of Hull, Hull, UK
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Carraway RE, Hassan S. Neurotensin receptor binding and neurotensin-induced growth signaling in prostate cancer PC3 cells are sensitive to metabolic stress. ACTA ACUST UNITED AC 2007; 141:140-53. [PMID: 17289170 DOI: 10.1016/j.regpep.2006.12.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2006] [Revised: 12/19/2006] [Accepted: 12/23/2006] [Indexed: 01/03/2023]
Abstract
Neurotensin (NT) stimulates the proliferation of prostate cancer PC3 cells, which express high levels of its G protein-coupled receptor NTS1. To shed light on mechanisms that might serve to coordinate mitogenic responses to metabolic status, we studied the effects of metabolic inhibitors on NTS1 function. We also related these effects to cellular ATP levels and to the activation of AMP-activated protein kinase (AMPK). Glycolytic and mitochondrial inhibitors, at concentrations that reduced cellular ATP levels, altered NT binding to the cells, inhibited NT-induced inositol phosphate formation, and inhibited NT-induced DNA synthesis. For eight of the nine inhibitors, the potencies to alter NT receptor function correlated to the potencies to decrease cellular ATP levels. In keeping with its known role to oppose metabolic stress, AMPK was activated by the metabolic inhibitors. Accordingly, the AMPK activator AICAR elevated cellular ATP levels and produced effects on NTS1 function that were opposite to those for the metabolic inhibitors. These results indicate that metabolic stress inhibited NTS1 function by a mechanism that involved a fall in cellular ATP levels and that was opposed by activation of AMPK. In a broader context, these findings are compatible with the idea that one means by which cells might coordinate mitogenic signaling to metabolic status could involve changes in growth factor receptor function.
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Affiliation(s)
- Robert E Carraway
- Department of Physiology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA.
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Carraway RE, Plona AM. Involvement of neurotensin in cancer growth: evidence, mechanisms and development of diagnostic tools. Peptides 2006; 27:2445-60. [PMID: 16887236 DOI: 10.1016/j.peptides.2006.04.030] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2005] [Accepted: 04/06/2006] [Indexed: 12/22/2022]
Abstract
Focusing on the literature of the past 15 years, we evaluate the evidence that neurotensin and neurotensin receptors participate in cancer growth and we describe possible mechanisms. In addition, we review the progress achieved in the use of neurotensin analogs to image tumors in animals and humans. These exciting advances encourage us to pursue further research and stimulate us to consider novel ideas regarding the multiple inputs to cancer growth that neurotensin might influence.
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Affiliation(s)
- Robert E Carraway
- Department of Physiology, University of Massachusetts Medical School, Worcester, MA 01655, USA.
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Carraway RE, Hassan S, Cochrane DE. Regulation of neurotensin receptor function by the arachidonic acid-lipoxygenase pathway in prostate cancer PC3 cells. Prostaglandins Leukot Essent Fatty Acids 2006; 74:93-107. [PMID: 16406549 DOI: 10.1016/j.plefa.2005.11.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2005] [Revised: 11/04/2005] [Accepted: 11/09/2005] [Indexed: 11/19/2022]
Abstract
Neurotensin (NT) elevates leukotriene levels in animals and stimulates 5-HETE formation in prostate cancer PC3 cells. PC3 cell growth is stimulated by NT and inhibited by lipoxygenase (LOX) blockers. This led us to test LOX blockers (NDGA, MK886, ETYA, Rev5901, AA861 and others) for effects on NT binding and signaling. LOX blockers dramatically enhanced 125I-neurotensin binding to NT receptor NTR1 in PC3 cells, whereas they inhibited NT-induced inositol phosphate formation. These effects were indirect (binding to isolated membranes was unaffected), receptor-specific (binding to beta2-adrenergic, V1a-vasopressin, EGF and bombesin receptor was unaffected) and pathway-specific (cyclooxygenase inhibitors were inactive). NT receptor affinity was increased but receptor number and % internalization were unchanged. Also supporting the involvement of arachidonic acid metabolism in NTR1 regulation was the finding that inhibitors of PLA2 and DAG lipase enhanced NT binding. These findings suggest that NTR1 is regulated by specific feedback mechanism(s) involving lipid peroxidation and/or LOX-dependent processes.
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Affiliation(s)
- Robert E Carraway
- Department of Physiology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA.
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