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He Y, Li H, Chen Y, Li P, Gao L, Zheng Y, Sun Y, Chen J, Qian X. Expression of anoctamin 1 is associated with advanced tumor stage in patients with non-small cell lung cancer and predicts recurrence after surgery. Clin Transl Oncol 2017; 19:1091-1098. [DOI: 10.1007/s12094-017-1643-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 03/02/2017] [Indexed: 02/07/2023]
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102
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Liu L, Zhan P, Nie D, Fan L, Lin H, Gao L, Mao X. Intermediate-Conductance-Ca2-Activated K Channel IKCa1 Is Upregulated and Promotes Cell Proliferation in Cervical Cancer. Med Sci Monit Basic Res 2017; 23:45-57. [PMID: 28280257 PMCID: PMC5358865 DOI: 10.12659/msmbr.901462] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 12/20/2016] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Accumulating data point to intermediate-conductance calcium-activated potassium channel (IKCa1) as a key player in controlling cell cycle progression and proliferation of human cancer cells. However, the role that IKCa1 plays in the growth of human cervical cancer cells is largely unexplored. MATERIAL AND METHODS In this study, Western blot analysis, immunohistochemical staining, and RT-PCR were first used for IKCa1protein and gene expression assays in cervical cancer tissues and HeLa cells. Then, IKCa1 channel blocker and siRNA were employed to inhibit the functionality of IKCa1 and downregulate gene expression in HeLa cells, respectively. After these treatments, we examined the level of cell proliferation by MTT method and measured IKCa1 currents by conventional whole-cell patch clamp technique. Cell apoptosis was assessed using the Annexin V-FITC/Propidium Iodide (PI) double-staining apoptosis detection kit. RESULTS We demonstrated that IKCa1 mRNA and protein are preferentially expressed in cervical cancer tissues and HeLa cells. We also showed that the IKCa1 channel blocker, clotrimazole, and IKCa1 channel siRNA can be used to suppress cervical cancer cell proliferation and decrease IKCa1 channel current. IKCa1 downregulation by specific siRNAs induced a significant increase in the proportion of apoptotic cells in HeLa cells. CONCLUSIONS IKCa1 is overexpressed in cervical cancer tissues, and IKCa1 upregulation in cervical cancer cell linea enhances cell proliferation, partly by reducing the proportion of apoptotic cells.
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Affiliation(s)
| | | | | | | | | | | | - Xiguang Mao
- Corresponding Authors: Xiguang Mao, e-mail: ; Lanyang Gao, e-mail:
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Abstract
Frequently observed phenotypes of tumours include high metabolic activity, hypoxia and poor perfusion; these act to produce an acidic microenvironment. Cellular function depends on pH homoeostasis, and thus, tumours become dependent on pH regulatory mechanisms. Many of the proteins involved in pH regulation are highly expressed in tumours, and their expression is often of prognostic significance. The more acidic tumour microenvironment also has important implications with regard to chemotherapeutic and radiotherapeutic interventions. In addition, we review pH-sensing mechanisms, the role of pH regulation in tumour phenotype and the use of pH regulatory mechanisms as therapeutic targets.
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Affiliation(s)
- Alan McIntyre
- Molecular Oncology Laboratories, Department of Medical Oncology, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Adrian L Harris
- Molecular Oncology Laboratories, Department of Medical Oncology, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
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104
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Geybels MS, McCloskey KD, Mills IG, Stanford JL. Calcium Channel Blocker Use and Risk of Prostate Cancer by TMPRSS2:ERG Gene Fusion Status. Prostate 2017; 77:282-290. [PMID: 27753122 PMCID: PMC5668682 DOI: 10.1002/pros.23267] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 09/30/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND Calcium channel blockers (CCBs) may affect prostate cancer (PCa) growth by various mechanisms including those related to androgens. The fusion of the androgen-regulated gene TMPRSS2 and the oncogene ERG (TMPRSS2:ERG or T2E) is common in PCa, and prostate tumors that harbor the gene fusion are believed to represent a distinct disease subtype. We studied the association of CCB use with the risk of PCa, and molecular subtypes of PCa defined by T2E status. METHODS Participants were residents of King County, Washington, recruited for population-based case-control studies (1993-1996 or 2002-2005). Tumor T2E status was determined by fluorescence in situ hybridization using tumor tissue specimens from radical prostatectomy. Detailed information on use of CCBs and other variables was obtained through in-person interviews. Binomial and polytomous logistic regression were used to generate odds ratios (ORs) and 95% confidence intervals (CIs). RESULTS The study included 1,747 PCa patients and 1,635 age-matched controls. A subset of 563 patients treated with radical prostatectomy had T2E status determined, of which 295 were T2E positive (52%). Use of CCBs (ever vs. never) was not associated with overall PCa risk. However, among European-American men, users had a reduced risk of higher-grade PCa (Gleason scores ≥7: adjusted OR = 0.64; 95% CI: 0.44-0.95). Further, use of CCBs was associated with a reduced risk of T2E positive PCa (adjusted OR = 0.38; 95% CI: 0.19-0.78), but was not associated with T2E negative PCa. CONCLUSIONS This study found suggestive evidence that use of CCBs is associated with reduced relative risks for higher Gleason score and T2E positive PCa. Future studies of PCa etiology should consider etiologic heterogeneity as PCa subtypes may develop through different causal pathways. Prostate 77:282-290, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Milan S. Geybels
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington
- Department of Epidemiology, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, the Netherlands
- Corresponding authors: ;
| | - Karen D. McCloskey
- Centre for Cancer Research and Cell Biology, Queen’s University of Belfast, Belfast, UK
| | - Ian G. Mills
- Prostate Cancer Research Group, Centre for Molecular Medicine, University of Oslo and Oslo University Hospitals, Oslo, Norway; Department of Molecular Oncology, Institute for Cancer Research, Oslo University Hospitals-Radium Hospital, Montebello, Oslo, Norway
| | - Janet L. Stanford
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington
- Department of Epidemiology, University of Washington, School of Public Health, Seattle, Washington
- Corresponding authors: ;
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105
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Tomita Y, Dorward H, Yool AJ, Smith E, Townsend AR, Price TJ, Hardingham JE. Role of Aquaporin 1 Signalling in Cancer Development and Progression. Int J Mol Sci 2017; 18:ijms18020299. [PMID: 28146084 PMCID: PMC5343835 DOI: 10.3390/ijms18020299] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 01/19/2017] [Accepted: 01/23/2017] [Indexed: 02/07/2023] Open
Abstract
Cancer is a major health burden worldwide. Despite the advances in our understanding of its pathogenesis and continued improvement in cancer management and outcomes, there remains a strong clinical demand for more accurate and reliable biomarkers of metastatic progression and novel therapeutic targets to abrogate angiogenesis and tumour progression. Aquaporin 1 (AQP1) is a small hydrophobic integral transmembrane protein with a predominant role in trans-cellular water transport. Recently, over-expression of AQP1 has been associated with many types of cancer as a distinctive clinical prognostic factor. This has prompted researchers to evaluate the link between AQP1 and cancer biological functions. Available literature implicates the role of AQP1 in tumour cell migration, invasion and angiogenesis. This article reviews the current understanding of AQP1-facilitated tumour development and progression with a focus on regulatory mechanisms and downstream signalling pathways.
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Affiliation(s)
- Yoko Tomita
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital & Discipline of Physiology, School of Medicine, University of Adelaide, Adelaide, SA 5000, Australia.
| | - Hilary Dorward
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia.
| | - Andrea J Yool
- Discipline of Physiology, School of Medicine, University of Adelaide, Adelaide, SA 5000, Australia.
| | - Eric Smith
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia.
| | - Amanda R Townsend
- Medical Oncology, The Queen Elizabeth Hospital & School of Medicine, University of Adelaide, Adelaide, SA 5000, Australia.
| | - Timothy J Price
- Medical Oncology, The Queen Elizabeth Hospital & School of Medicine, University of Adelaide, Adelaide, SA 5000, Australia.
| | - Jennifer E Hardingham
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital & Discipline of Physiology, School of Medicine, University of Adelaide, Adelaide, SA 5000, Australia.
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106
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Zhai J, Hsu CH, Daye ZJ. Ridle for sparse regression with mandatory covariates with application to the genetic assessment of histologic grades of breast cancer. BMC Med Res Methodol 2017; 17:12. [PMID: 28122498 PMCID: PMC5267467 DOI: 10.1186/s12874-017-0291-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2016] [Accepted: 01/06/2017] [Indexed: 12/13/2022] Open
Abstract
Background Many questions in statistical genomics can be formulated in terms of variable selection of candidate biological factors for modeling a trait or quantity of interest. Often, in these applications, additional covariates describing clinical, demographical or experimental effects must be included a priori as mandatory covariates while allowing the selection of a large number of candidate or optional variables. As genomic studies routinely require mandatory covariates, it is of interest to propose principled methods of variable selection that can incorporate mandatory covariates. Methods In this article, we propose the ridge-lasso hybrid estimator (ridle), a new penalized regression method that simultaneously estimates coefficients of mandatory covariates while allowing selection for others. The ridle provides a principled approach to mitigate effects of multicollinearity among the mandatory covariates and possible dependency between mandatory and optional variables. We provide detailed empirical and theoretical studies to evaluate our method. In addition, we develop an efficient algorithm for the ridle. Software, based on efficient Fortran code with R-language wrappers, is publicly and freely available at https://sites.google.com/site/zhongyindaye/software. Results The ridle is useful when mandatory predictors are known to be significant due to prior knowledge or must be kept for additional analysis. Both theoretical and comprehensive simulation studies have shown that the ridle to be advantageous when mandatory covariates are correlated with the irrelevant optional predictors or are highly correlated among themselves. A microarray gene expression analysis of the histologic grades of breast cancer has identified 24 genes, in which 2 genes are selected only by the ridle among current methods and found to be associated with tumor grade. Conclusions In this article, we proposed the ridle as a principled sparse regression method for the selection of optional variables while incorporating mandatory ones. Results suggest that the ridle is advantageous when mandatory covariates are correlated with the irrelevant optional predictors or are highly correlated among themselves. Electronic supplementary material The online version of this article (doi:10.1186/s12874-017-0291-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jing Zhai
- Epidemiology and Biostatistics Department, University of Arizona, Tucson, USA
| | - Chiu-Hsieh Hsu
- Epidemiology and Biostatistics Department, University of Arizona, Tucson, USA
| | - Z John Daye
- Epidemiology and Biostatistics Department, University of Arizona, Tucson, USA.
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Rivarola V, Di Giusto G, Christensen MJ, Ford P, Capurro C. AQP2-Induced Acceleration of Renal Cell Proliferation Involves the Activation of a Regulatory Volume Increase Mechanism Dependent on NHE2. J Cell Biochem 2017; 118:967-978. [DOI: 10.1002/jcb.25602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 05/17/2016] [Indexed: 02/04/2023]
Affiliation(s)
- Valeria Rivarola
- Facultad de Medicina, Departamento de Ciencia Fisiológicas; Laboratorio de Biomembranas, IFIBIO Houssay, CONICET-UBA, Universidad de Buenos Aires; Buenos Aires Argentina
| | - Gisela Di Giusto
- Facultad de Medicina, Departamento de Ciencia Fisiológicas; Laboratorio de Biomembranas, IFIBIO Houssay, CONICET-UBA, Universidad de Buenos Aires; Buenos Aires Argentina
| | - María José Christensen
- Facultad de Medicina, Departamento de Ciencia Fisiológicas; Laboratorio de Biomembranas, IFIBIO Houssay, CONICET-UBA, Universidad de Buenos Aires; Buenos Aires Argentina
| | - Paula Ford
- Facultad de Medicina, Departamento de Ciencia Fisiológicas; Laboratorio de Biomembranas, IFIBIO Houssay, CONICET-UBA, Universidad de Buenos Aires; Buenos Aires Argentina
| | - Claudia Capurro
- Facultad de Medicina, Departamento de Ciencia Fisiológicas; Laboratorio de Biomembranas, IFIBIO Houssay, CONICET-UBA, Universidad de Buenos Aires; Buenos Aires Argentina
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108
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Latorre R, Castillo K, Carrasquel-Ursulaez W, Sepulveda RV, Gonzalez-Nilo F, Gonzalez C, Alvarez O. Molecular Determinants of BK Channel Functional Diversity and Functioning. Physiol Rev 2017; 97:39-87. [DOI: 10.1152/physrev.00001.2016] [Citation(s) in RCA: 151] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Large-conductance Ca2+- and voltage-activated K+ (BK) channels play many physiological roles ranging from the maintenance of smooth muscle tone to hearing and neurosecretion. BK channels are tetramers in which the pore-forming α subunit is coded by a single gene ( Slowpoke, KCNMA1). In this review, we first highlight the physiological importance of this ubiquitous channel, emphasizing the role that BK channels play in different channelopathies. We next discuss the modular nature of BK channel-forming protein, in which the different modules (the voltage sensor and the Ca2+ binding sites) communicate with the pore gates allosterically. In this regard, we review in detail the allosteric models proposed to explain channel activation and how the models are related to channel structure. Considering their extremely large conductance and unique selectivity to K+, we also offer an account of how these two apparently paradoxical characteristics can be understood consistently in unison, and what we have learned about the conduction system and the activation gates using ions, blockers, and toxins. Attention is paid here to the molecular nature of the voltage sensor and the Ca2+ binding sites that are located in a gating ring of known crystal structure and constituted by four COOH termini. Despite the fact that BK channels are coded by a single gene, diversity is obtained by means of alternative splicing and modulatory β and γ subunits. We finish this review by describing how the association of the α subunit with β or with γ subunits can change the BK channel phenotype and pharmacology.
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Affiliation(s)
- Ramon Latorre
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Karen Castillo
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Willy Carrasquel-Ursulaez
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Romina V. Sepulveda
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Fernando Gonzalez-Nilo
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Carlos Gonzalez
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Osvaldo Alvarez
- Centro Interdisciplinario de Neurociencia de Valparaíso and Doctorado en Ciencias Mención Neurociencia, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile; Universidad Andres Bello, Facultad de Ciencias Biologicas, Center for Bioinformatics and Integrative Biology, Avenida Republica 239, Santiago, Chile and Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
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109
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Zhao LY, Xu WL, Xu ZQ, Qi C, Li Y, Cheng J, Liu LK, Wu YN, Gao J, Ye JH. The overexpressed functional transient receptor potential channel TRPM2 in oral squamous cell carcinoma. Sci Rep 2016; 6:38471. [PMID: 28008929 PMCID: PMC5180100 DOI: 10.1038/srep38471] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 11/10/2016] [Indexed: 12/20/2022] Open
Abstract
TRPM2, one member of the transient receptor potential (TRP) protein super-family, is a Ca2+-permeable channel that is activated by oxidative stress and confers susceptibility to cell death. In the human tongue specimens of carcinoma and the tongue carcinoma SCC cell lines, we observed the enhanced expression of TRPM2. By means of the whole-cell electrophysiological recording, the ADPR-induced currents mediated by TRPM2 were recorded in cultured SCC9 cells. Moreover, after H2O2 treatment for 24 hours, the apoptotic number of SCC9 cells was significantly increased. However, the selectively knocked-down TRPM2 with the small interfering RNA technique inhibited the survival and migration of the SCC9 cancer cells, which was independent of the p53-p21 pathway, since the expression of p21 was enhanced after TRPM2 knockdown. Furthermore, the sub-cellular localization of TRPM2 was remarkably different between cancerous and non-cancerous cells. A significant amount of the TRPM2 proteins were located in the nuclei in cancer cells. All these data suggest that TRPM2 is essential for the survival and migration of SCC cancer cells and may be a potential target for the selective treatment of tongue cancer.
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Affiliation(s)
- Ling-Yan Zhao
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
| | - Wan-Lin Xu
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China.,Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Department of Oral and Maxillofacial-Head and Neck Oncology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200011, China
| | - Zeng-Qi Xu
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
| | - Cui Qi
- Key Laboratory of Human Functional Genomics of Jiangsu, Department of Neurobiology, Nanjing Medical University, 101 Longmian Road, Nanjing, Jiangsu, 211166, China
| | - Yang Li
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
| | - Jie Cheng
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
| | - Lai-Kui Liu
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
| | - Yu-Nong Wu
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
| | - Jun Gao
- Key Laboratory of Human Functional Genomics of Jiangsu, Department of Neurobiology, Nanjing Medical University, 101 Longmian Road, Nanjing, Jiangsu, 211166, China
| | - Jin-Hai Ye
- Jiangsu Key Laboratory of Oral Diseases and Department of Oral and maxillofacial surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China
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Fusi F, Spiga O, Trezza A, Sgaragli G, Saponara S. The surge of flavonoids as novel, fine regulators of cardiovascular Ca v channels. Eur J Pharmacol 2016; 796:158-174. [PMID: 28012974 DOI: 10.1016/j.ejphar.2016.12.033] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 12/15/2016] [Accepted: 12/20/2016] [Indexed: 01/28/2023]
Abstract
Ion channels underlie a wide variety of physiological processes that involve rapid changes in cell dynamics, such as cardiac and vascular smooth muscle contraction. Overexpression or dysfunction of these membrane proteins are the basis of many cardiovascular diseases that represent the leading cause of morbidity and mortality for human beings. In the last few years, flavonoids, widely distributed in the plant kingdom, have attracted the interest of many laboratories as an emerging class of fine ion, in particular Cav, channels modulators. Pieces of in vitro evidence for direct as well as indirect effects exerted by various flavonoids on ion channel currents are now accumulating in the scientific literature. This activity may be responsible, at least in part, for the beneficial and protective effects of dietary flavonoids toward cardiovascular diseases highlighted in several epidemiological studies. Here we examine numerous studies aimed at analysing this feature of flavonoids, focusing on the mechanisms that promote their sometimes controversial activities at cardiovascular Cav channels. New methodological approaches, such as molecular modelling and docking to Cav1.2 channel α1c subunit, used to elucidate flavonoids intrinsic mechanism of action, are introduced. Moreover, flavonoid-membrane interaction, bioavailability, and antioxidant activity are taken into account and discussed.
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Affiliation(s)
- Fabio Fusi
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy.
| | - Ottavia Spiga
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| | - Alfonso Trezza
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| | - Giampietro Sgaragli
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
| | - Simona Saponara
- Dipartimento di Scienze della Vita, Università degli Studi di Siena, via A. Moro 2, 53100 Siena, Italy
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111
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Kim YS, Hong CS, Lee SW, Nam JH, Kim BJ. Effects of ginger and its pungent constituents on transient receptor potential channels. Int J Mol Med 2016; 38:1905-1914. [PMID: 27840893 DOI: 10.3892/ijmm.2016.2791] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 10/24/2016] [Indexed: 11/05/2022] Open
Abstract
Ginger extract is used as an analeptic in herbal medicine and has been reported to exert antioxidant effects. Transient receptor potential (TRP) canonical 5 (TRPC5), TRP cation channel, subfamily M, member 7 (TRPM7; melastatin 7), and TRP cation channel, subfamily A, member 1 (TRPA1; ankyrin 1) are non-selective cation channels that are modulated by reactive oxygen/nitrogen species (ROS/RNS) and subsequently control various cellular processes. The aim of this study was to evaluate whether ginger and its pungent constituents modulate these channels and exert antioxidant effects. It was found that TRPC5 and TRPA1 currents were modulated by ginger extract and by its pungent constituents, [6]-gingerol, zingerone and [6]-shogaol. In particular, [6]-shogaol markedly and dose-dependently inhibited TRPC5 currents with an IC50 of value of ~18.3 µM. Furthermore, the strong dose-dependent activation of TRPA1 currents by [6]-shogaol was abolished by A‑967079 (a selective TRPA1 inhibitor). However, ginger extract and its pungent constituents had no effect on TRPM7 currents. These results suggest the antioxidant effects of ginger extract and its pungent constituents are mediated through TRPC5 and TRPA1, and that [6]-shogaol is predominantly responsible for the regulation of TRPC5 and TRPA1 currents by ginger extract.
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Affiliation(s)
- Young-Soo Kim
- Department of Neurosurgery, College of Medicine, Pusan National University, Yangsan Hospital, Yangsan, Republic of Korea
| | - Chan Sik Hong
- Department of Physiology and Biophysics, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sang Weon Lee
- Department of Neurosurgery, College of Medicine, Pusan National University, Yangsan Hospital, Yangsan, Republic of Korea
| | - Joo Hyun Nam
- Department of Physiology, Dongguk University, College of Medicine, Kyungju, Republic of Korea
| | - Byung Joo Kim
- Healthy Aging Korean Medical Research Center (HAKMRC), Pusan National University, School of Korean Medicine, Yangsan, Republic of Korea
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Gonnissen D, Qu Y, Langer K, Öztürk C, Zhao Y, Chen C, Seebohm G, Düfer M, Fuchs H, Galla HJ, Riehemann K. Comparison of cellular effects of starch-coated SPIONs and poly(lactic-co-glycolic acid) matrix nanoparticles on human monocytes. Int J Nanomedicine 2016; 11:5221-5236. [PMID: 27789942 PMCID: PMC5072557 DOI: 10.2147/ijn.s106540] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Within the last years, progress has been made in the knowledge of the properties of medically used nanoparticles and their toxic effects, but still, little is known about their influence on cellular processes of immune cells. The aim of our comparative study was to present the influence of two different nanoparticle types on subcellular processes of primary monocytes and the leukemic monocyte cell line MM6. We used core-shell starch-coated superparamagnetic iron oxide nanoparticles (SPIONs) and matrix poly(lactic-co-glycolic acid) (PLGA) nanoparticles for our experiments. In addition to typical biocompatibility testing like the detection of necrosis or secretion of interleukins (ILs), we investigated the impact of these nanoparticles on the actin cytoskeleton and the two voltage-gated potassium channels Kv1.3 and Kv7.1. Induction of necrosis was not seen for PLGA nanoparticles and SPIONs in primary monocytes and MM6 cells. Likewise, no alteration in secretion of IL-1β and IL-10 was detected under the same experimental conditions. In contrast, IL-6 secretion was exclusively downregulated in primary monocytes after contact with both nanoparticles. Two-electrode voltage clamp experiments revealed that both nanoparticles reduce currents of the aforementioned potassium channels. The two nanoparticles differed significantly in their impact on the actin cytoskeleton, demonstrated via atomic force microscopy elasticity measurement and phalloidin staining. While SPIONs led to the disruption of the respective cytoskeleton, PLGA did not show any influence in both experimental setups. The difference in the effects on ion channels and the actin cytoskeleton suggests that nanoparticles affect these subcellular components via different pathways. Our data indicate that the alteration of the cytoskeleton and the effect on ion channels are new parameters that describe the influence of nanoparticles on cells. The results are highly relevant for medical application and further evaluation of nanomaterial biosafety.
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Affiliation(s)
- Dominik Gonnissen
- Center for Nanotechnology, Institute of Physics, University of Münster, Münster, Germany
| | - Ying Qu
- Center for Nanotechnology, Institute of Physics, University of Münster, Münster, Germany; National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Klaus Langer
- Institute of Pharmaceutical Technology and Biopharmacy, University of Münster, Münster
| | | | - Yuliang Zhao
- National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Chunying Chen
- National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Guiscard Seebohm
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases, University Hospital Münster
| | - Martina Düfer
- Department of Pharmacology, Institute of Pharmaceutical and Medicinal Chemistry
| | - Harald Fuchs
- Center for Nanotechnology, Institute of Physics, University of Münster, Münster, Germany
| | - Hans-Joachim Galla
- Department of Cell Biology/Biophysics, Institute of Biochemistry, University of Münster, Münster, Germany
| | - Kristina Riehemann
- Center for Nanotechnology, Institute of Physics, University of Münster, Münster, Germany
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Biasiotta A, D'Arcangelo D, Passarelli F, Nicodemi EM, Facchiano A. Ion channels expression and function are strongly modified in solid tumors and vascular malformations. J Transl Med 2016; 14:285. [PMID: 27716384 PMCID: PMC5050926 DOI: 10.1186/s12967-016-1038-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 09/21/2016] [Indexed: 12/21/2022] Open
Abstract
Background Several cellular functions relate to ion-channels activity. Physiologically relevant chains of events leading to angiogenesis, cell cycle and different forms of cell death, require transmembrane voltage control. We hypothesized that the unordered angiogenesis occurring in solid cancers and vascular malformations might associate, at least in part, to ion-transport alteration. Methods The expression level of several ion-channels was analyzed in human solid tumor biopsies. Expression of 90 genes coding for ion-channels related proteins was investigated within the Oncomine database, in 25 independent patients-datasets referring to five histologically-different solid tumors (namely, bladder cancer, glioblastoma, melanoma, breast invasive-ductal cancer, lung carcinoma), in a total of 3673 patients (674 control-samples and 2999 cancer-samples). Furthermore, the ion-channel activity was directly assessed by measuring in vivo the electrical sympathetic skin responses (SSR) on the skin of 14 patients affected by the flat port-wine stains vascular malformation, i.e., a non-tumor vascular malformation clinical model. Results Several ion-channels showed significantly increased expression in tumors (p < 0.0005); nine genes (namely, CACNA1D, FXYD3, FXYD5, HTR3A, KCNE3, KCNE4, KCNN4, CLIC1, TRPM3) showed such significant modification in at least half of datasets investigated for each cancer type. Moreover, in vivo analyses in flat port-wine stains patients showed a significantly reduced SSR in the affected skin as compared to the contralateral healthy skin (p < 0.05), in both latency and amplitude measurements. Conclusions All together these data identify ion-channel genes showing significantly modified expression in different tumors and cancer-vessels, and indicate a relevant electrophysiological alteration in human vascular malformations. Such data suggest a possible role and a potential diagnostic application of the ion–electron transport in vascular disorders underlying tumor neo-angiogenesis and vascular malformations.
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Affiliation(s)
| | - Daniela D'Arcangelo
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Fondazione Luigi Maria Monti, via Monti di Creta 104, 00167, Rome, Italy
| | - Francesca Passarelli
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Fondazione Luigi Maria Monti, via Monti di Creta 104, 00167, Rome, Italy
| | - Ezio Maria Nicodemi
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Fondazione Luigi Maria Monti, via Monti di Creta 104, 00167, Rome, Italy.
| | - Antonio Facchiano
- Istituto Dermopatico dell'Immacolata, IDI-IRCCS, Fondazione Luigi Maria Monti, via Monti di Creta 104, 00167, Rome, Italy.
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Nriagu J, Darroudi F, Shomar B. Health effects of desalinated water: Role of electrolyte disturbance in cancer development. ENVIRONMENTAL RESEARCH 2016; 150:191-204. [PMID: 27295409 DOI: 10.1016/j.envres.2016.05.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 05/18/2016] [Accepted: 05/20/2016] [Indexed: 06/06/2023]
Abstract
This review contends that "healthy" water in terms of electrolyte balance is as important as "pure" water in promoting public health. It considers the growing use of desalination (demineralization) technologies in drinking water treatment which often results in tap water with very low concentrations of sodium, potassium, magnesium and calcium. Ingestion of such water can lead to electrolyte abnormalities marked by hyponatremia, hypokalemia, hypomagnesemia and hypocalcemia which are among the most common and recognizable features in cancer patients. The causal relationships between exposure to demineralized water and malignancies are poorly understood. This review highlights some of the epidemiological and in vivo evidence that link dysregulated electrolyte metabolism with carcinogenesis and the development of cancer hallmarks. It discusses how ingestion of demineralized water can have a procarcinogenic effect through mediating some of the critical pathways and processes in the cancer microenvironment such as angiogenesis, genomic instability, resistance to programmed cell death, sustained proliferative signaling, cell immortalization and tumorigenic inflammation. Evidence that hypoosmotic stress-response processes can upregulate a number of potential oncogenes is well supported by a number studies. In view of the rising production and consumption of demineralized water in most parts of the world, there is a strong need for further research on the biological importance and protean roles of electrolyte abnormalities in promoting, antagonizing or otherwise enabling the development of cancer. The countries of the Gulf Cooperative Council (GCC) where most people consume desalinated water would be a logical place to start this research.
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Affiliation(s)
- Jerome Nriagu
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 48109, United States.
| | - Firouz Darroudi
- Centre of Human Safety and Environmental Research, Department of Health Sciences, College of North Atlantic, Doha, Qatar; Centre of Human Safety & Health and Diagnostic Genome Analysis, Red Crescent Hospital, Dubai, United Arab Emirates
| | - Basem Shomar
- Qatar Environmental and Energy Research Institute (QEERI), Qatar Foundation, Doha, Qatar
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A Characeae Cells Plasma Membrane as a Model for Selection of Bioactive Compounds and Drugs: Interaction of HAMLET-Like Complexes with Ion Channels of Chara corallina Cells Plasmalemma. J Membr Biol 2016; 249:801-811. [DOI: 10.1007/s00232-016-9930-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 09/07/2016] [Indexed: 01/10/2023]
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Sales TT, Resende FFB, Chaves NL, Titze-De-Almeida SS, Báo SN, Brettas ML, Titze-De-Almeida R. Suppression of the Eag1 potassium channel sensitizes glioblastoma cells to injury caused by temozolomide. Oncol Lett 2016; 12:2581-2589. [PMID: 27698831 PMCID: PMC5038559 DOI: 10.3892/ol.2016.4992] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 06/16/2016] [Indexed: 01/31/2023] Open
Abstract
Glioblastoma multiforme (GBM) is the most aggressive type of human primary brain tumor. The standard treatment protocol includes radiotherapy in combination with temozolomide (TMZ). Despite advances in GBM treatment, the survival time of patients diagnosed with glioma is 14.5 months. Regarding tumor biology, various types of cancer cell overexpress the ether à go-go 1 (Eag1) potassium channel. Therefore, the present study examined the role of Eag1 in the cell damage caused by TMZ on the U87MG glioblastoma cell line. Eag1 was inhibited using a channel blocker (astemizole) or silenced by a short-hairpin RNA expression vector (pKv10.1-3). pKv10.1-3 (0.2 µg) improved the Eag1 silencing caused by 250 µM TMZ, as determined by reverse transcription-quantitative polymerase chain reaction and immunocytochemistry. Additionally, inhibiting Eag1 with the vector or astemizole (5 µM) reduced glioblastoma cell viability and sensitized cells to TMZ. Cell viability decreased by 63% for pKv10.1-3 + TMZ compared with 34% for TMZ alone, and by 77% for astemizole + TMZ compared with 46% for TMZ alone, as determined by MTT assay. In addition, both the vector and astemizole increased the apoptosis rate of glioblastoma cells triggered by TMZ, as determined by an Annexin V apoptosis assay. Collectively, the current data reveal that Eag1 has a role in the damage caused to glioblastoma by TMZ. Furthermore, suppression of this channel can improve the action of TMZ on U87MG glioblastoma cells. Thus, silencing Eag1 is a promising strategy to improve GBM treatment and merits additional studies in animal models of glioma.
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Affiliation(s)
- Thais Torquato Sales
- Technology for Gene Therapy Laboratory, Central Institute of Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasília, Brasília DF 70910-900, Brazil
| | - Fernando Francisco Borges Resende
- Technology for Gene Therapy Laboratory, Central Institute of Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasília, Brasília DF 70910-900, Brazil
| | - Natália Lemos Chaves
- Department of Cellular Biology, Institute of Biological Sciences, University of Brasília, Brasília DF 70910-900, Brazil
| | - Simoneide Souza Titze-De-Almeida
- Technology for Gene Therapy Laboratory, Central Institute of Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasília, Brasília DF 70910-900, Brazil
| | - Sônia Nair Báo
- Department of Cellular Biology, Institute of Biological Sciences, University of Brasília, Brasília DF 70910-900, Brazil
| | - Marcella Lemos Brettas
- Department of Cellular Biology, Institute of Biological Sciences, University of Brasília, Brasília DF 70910-900, Brazil; Planaltina Campus, University of Brasília, Brasília DF 70910-900, Brazil
| | - Ricardo Titze-De-Almeida
- Technology for Gene Therapy Laboratory, Central Institute of Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasília, Brasília DF 70910-900, Brazil
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117
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Wang Z, Jin K, Xia Y. Transcriptional analysis of the conidiation pattern shift of the entomopathogenic fungus Metarhizium acridum in response to different nutrients. BMC Genomics 2016; 17:586. [PMID: 27506833 PMCID: PMC4979188 DOI: 10.1186/s12864-016-2971-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 07/27/2016] [Indexed: 12/14/2022] Open
Abstract
Background Most fungi, including entomopathogenic fungi, have two different conidiation patterns, normal and microcycle conidiation, under different culture conditions, eg, in media containing different nutrients. However, the mechanisms underlying the conidiation pattern shift are poorly understood. Results In this study, Metarhizium acridum undergoing microcycle conidiation on sucrose yeast extract agar (SYA) medium shifted to normal conidiation when the medium was supplemented with sucrose, nitrate, or phosphate. By linking changes in nutrients with the conidiation pattern shift and transcriptional changes, we obtained conidiation pattern shift libraries by Solexa/Illumina deep-sequencing technology. A comparative analysis demonstrated that the expression of 137 genes was up-regulated during the shift to normal conidiation, while the expression of 436 genes was up-regulated at the microcycle conidiation stage. A comparison of subtractive libraries revealed that 83, 216, and 168 genes were related to sucrose-induced, nitrate-induced, and phosphate-induced conidiation pattern shifts, respectively. The expression of 217 genes whose expression was specific to microcycle conidiation was further analyzed by the gene expression profiling via multigene concatemers method using mRNA isolated from M. acridum grown on SYA and the four normal conidiation media. The expression of 142 genes was confirmed to be up-regulated on standard SYA medium. Of these 142 genes, 101 encode hypothetical proteins or proteins of unknown function, and only 41 genes encode proteins with putative functions. Of these 41 genes, 18 are related to cell growth, 10 are related to cell proliferation, three are related to the cell cycle, three are related to cell differentiation, two are related to cell wall synthesis, two are related to cell division, and seven have other functions. These results indicate that the conidiation pattern shift in M. acridum mainly results from changes in cell growth and proliferation. Conclusions The results indicate that M. acridum shifts conidiation pattern from microcycle conidiation to normal conidiation when there is increased sucrose, nitrate, or phosphate in the medium during microcycle conidiation. The regulation of conidiation patterning is a complex process involving the cell cycle and metabolism of M. acridum. This study provides essential information about the molecular mechanism of the induction of the conidiation pattern shift by single nutrients. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-2971-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zhenglong Wang
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400045, People's Republic of China.,Chongqing Engineering Research Center for Fungal Insecticide, Chongqing University, Chongqing, 400045, People's Republic of China.,Key Laboratory of Gene Function and Regulation Technologies under Chongqing Municipal Education Commission, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Kai Jin
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400045, People's Republic of China.,Chongqing Engineering Research Center for Fungal Insecticide, Chongqing University, Chongqing, 400045, People's Republic of China.,Key Laboratory of Gene Function and Regulation Technologies under Chongqing Municipal Education Commission, Chongqing University, Chongqing, 400045, People's Republic of China
| | - Yuxian Xia
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400045, People's Republic of China. .,Chongqing Engineering Research Center for Fungal Insecticide, Chongqing University, Chongqing, 400045, People's Republic of China. .,Key Laboratory of Gene Function and Regulation Technologies under Chongqing Municipal Education Commission, Chongqing University, Chongqing, 400045, People's Republic of China.
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Potential Roles of Amiloride-Sensitive Sodium Channels in Cancer Development. BIOMED RESEARCH INTERNATIONAL 2016; 2016:2190216. [PMID: 27403419 PMCID: PMC4926023 DOI: 10.1155/2016/2190216] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 04/18/2016] [Accepted: 05/23/2016] [Indexed: 12/15/2022]
Abstract
The ENaC/degenerin ion channel superfamily includes the amiloride-sensitive epithelial sodium channel (ENaC) and acid sensitive ionic channel (ASIC). ENaC is a multimeric ion channel formed by heteromultimeric membrane glycoproteins, which participate in a multitude of biological processes by mediating the transport of sodium (Na+) across epithelial tissues such as the kidney, lungs, bladder, and gut. Aberrant ENaC functions contribute to several human disease states including pseudohypoaldosteronism, Liddle syndrome, cystic fibrosis, and salt-sensitive hypertension. Increasing evidence suggests that ion channels not only regulate ion homeostasis and electric signaling in excitable cells but also play important roles in cancer cell behaviors such as proliferation, apoptosis, invasion, and migration. Indeed, ENaCs/ASICs had been reported to be associated with cancer characteristics. Given their cell surface localization and pharmacology, pharmacological strategies to target ENaC/ASIC family members may be promising cancer therapeutics.
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119
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Cong D, Zhu W, Kuo JS, Hu S, Sun D. Ion transporters in brain tumors. Curr Med Chem 2016; 22:1171-81. [PMID: 25620102 DOI: 10.2174/0929867322666150114151946] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 01/05/2015] [Accepted: 01/08/2015] [Indexed: 11/22/2022]
Abstract
Ion transporters are important in regulation of ionic homeostasis, cell volume, and cellular signal transduction under physiological conditions. They have recently emerged as important players in cancer progression. In this review, we discussed two important ion transporter proteins, sodium-potassium-chloride cotransporter isoform 1 (NKCC-1) and sodium-hydrogen exchanger isoform 1 (NHE-1) in Glioblastoma multiforme (GBM) and other malignant tumors. NKCC-1 is a Na(+)- dependent Cl(-) transporter that mediates the movement of Na(+), K(+), and Cl(-) ions across the plasma membrane and maintains cell volume and intracellular K(+) and Cl(-) homeostasis. NHE-1 is a ubiquitously expressed cell membrane protein which regulates intracellular pH (pH(i)) and extracellular pH (pH(e)) homeostasis and cell volume. Here, we summarized recent pre-clinical experimental studies on NKCC-1 and NHE-1 in GBM and other malignant tumors, such as breast cancer, hepatocellular carcinoma, and lung cancer cells. These studies illustrated that pharmacological inhibition or down-regulation of these ion transporter proteins reduces proliferation, increases apoptosis, and suppresses migration and invasion of cancer cells. These new findings reveal the potentials of these ion transporters as new targets for cancer diagnosis and/or treatment.
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Affiliation(s)
| | | | | | | | - Dandan Sun
- Department of Neurology, University of Pittsburgh Medical School, S-598 South Biomedical Science Tower (BST), 3500 Terrace St., Pittsburgh, PA 15213, USA.
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Abstract
Activation of ion channels and pores are essential steps during regulated cell death. Channels and pores participate in execution of apoptosis, necroptosis and other forms of caspase-independent cell death. Within the program of regulated cell death, these channels are strategically located. Ion channels can shrink cells and drive them towards apoptosis, resulting in silent, i.e. immunologically unrecognized cell death. Alternatively, activation of channels can induce cell swelling, disintegration of the cell membrane, and highly immunogenic necrotic cell death. The underlying cell death pathways are not strictly separated as identical stimuli may induce cell shrinkage and apoptosis when applied at low strength, but may also cause cell swelling at pronounced stimulation, resulting in regulated necrosis. Nevertheless, the precise role of ion channels during regulated cell death is far from being understood, as identical channels may support regulated death in some cell types, but may cause cell proliferation, cancer development, and metastasis in others. Along this line, the phospholipid scramblase and Cl(-)/nonselective channel anoctamin 6 (ANO6) shows interesting features, as it participates in apoptotic cell death during lower levels of activation, thereby inducing cell shrinkage. At strong activation, e.g. by stimulation of purinergic P2Y7 receptors, it participates in pore formation, causes massive membrane blebbing, cell swelling, and membrane disintegration. The LRRC8 proteins deserve much attention as they were found to have a major role in volume regulation, apoptotic cell shrinkage and resistance towards anticancer drugs.
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Affiliation(s)
- Karl Kunzelmann
- Institut für Physiologie, Universität Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany.
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121
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Scherl C, Schäfer R, Schlabrakowski A, Tziridis K, Iro H, Wendler O. Nicotinic Acetylcholine Receptors in Head and Neck Cancer and Their Correlation to Tumor Site and Progression. ORL J Otorhinolaryngol Relat Spec 2016; 78:151-8. [DOI: 10.1159/000445781] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 03/22/2016] [Indexed: 11/19/2022]
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122
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Hua X, Szymanski C, Wang Z, Zhou Y, Ma X, Yu J, Evans J, Orr G, Liu S, Zhu Z, Yu XY. Chemical imaging of molecular changes in a hydrated single cell by dynamic secondary ion mass spectrometry and super-resolution microscopy. Integr Biol (Camb) 2016; 8:635-644. [DOI: 10.1039/c5ib00308c] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Affiliation(s)
- Xin Hua
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu Province, 211189, China
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Craig Szymanski
- W. R. Wiley Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Zhaoying Wang
- W. R. Wiley Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Yufan Zhou
- W. R. Wiley Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Xiang Ma
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Jiachao Yu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu Province, 211189, China
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - James Evans
- W. R. Wiley Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Galya Orr
- W. R. Wiley Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Songqin Liu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu Province, 211189, China
| | - Zihua Zhu
- W. R. Wiley Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Xiao-Ying Yu
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
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Fernández-Valle Á, Rodrigo JP, Rodríguez-Santamarta T, Villaronga MÁ, Álvarez-Teijeiro S, García-Pedrero JM, Suárez-Fernández L, Lequerica-Fernández P, de Vicente JC. HERG1 potassium channel expression in potentially malignant disorders of the oral mucosa and prognostic relevance in oral squamous cell carcinoma. Head Neck 2016; 38:1672-1678. [DOI: 10.1002/hed.24493] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 02/24/2016] [Accepted: 03/21/2016] [Indexed: 01/17/2023] Open
Affiliation(s)
- Álvaro Fernández-Valle
- Department of Oral and Maxillofacial Surgery; Hospital Universitario Central de Asturias (HUCA); Oviedo Asturias Spain
| | - Juan Pablo Rodrigo
- Department of Otolaryngology; Hospital Universitario Central de Asturias (HUCA); Oviedo Asturias Spain
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA); Hospital Universitario Central de Asturias, Edificio Consultas Externas, Planta Baja Lab 2 ORL-IUOPA; Oviedo Asturias Spain
| | - Tania Rodríguez-Santamarta
- Department of Oral and Maxillofacial Surgery; Hospital Universitario Central de Asturias (HUCA); Oviedo Asturias Spain
| | - M. Ángeles Villaronga
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA); Hospital Universitario Central de Asturias, Edificio Consultas Externas, Planta Baja Lab 2 ORL-IUOPA; Oviedo Asturias Spain
| | - Saúl Álvarez-Teijeiro
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA); Hospital Universitario Central de Asturias, Edificio Consultas Externas, Planta Baja Lab 2 ORL-IUOPA; Oviedo Asturias Spain
| | - Juana M. García-Pedrero
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA); Hospital Universitario Central de Asturias, Edificio Consultas Externas, Planta Baja Lab 2 ORL-IUOPA; Oviedo Asturias Spain
| | - Laura Suárez-Fernández
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA); Hospital Universitario Central de Asturias, Edificio Consultas Externas, Planta Baja Lab 2 ORL-IUOPA; Oviedo Asturias Spain
| | | | - Juan Carlos de Vicente
- Department of Oral and Maxillofacial Surgery; Hospital Universitario Central de Asturias (HUCA); Oviedo Asturias Spain
- Instituto Universitario de Oncología del Principado de Asturias (IUOPA); Hospital Universitario Central de Asturias, Edificio Consultas Externas, Planta Baja Lab 2 ORL-IUOPA; Oviedo Asturias Spain
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Lin CM, Ma JM, Zhang L, Hao ZY, Zhou J, Zhou ZY, Shi HQ, Zhang YF, Shao EM, Liang CZ. Inhibition of Transient Receptor Potential Melastain 7 Enhances Apoptosis Induced by TRAIL in PC-3 cells. Asian Pac J Cancer Prev 2016; 16:4469-75. [PMID: 26028116 DOI: 10.7314/apjcp.2015.16.10.4469] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Transient receptor potential melastain 7 (TRPM7) is a bifunctional protein with dual structure of both ion channel and protein kinase, participating in a wide variety of diseases including cancer. Recent researches have reported the mechanism of TRPM7 in human cancers. However, the correlation between TRPM7 and prostate cancer (PCa) has not been well studied. The objective of this study was to investigate the potential the role of TRPM7 in the apoptosis of PC-3 cells, which is the key cell of advanced metastatic PCa. In this study, we demonstrated the influence and potential function of TRPM7 on the PC-3 cells apoptosis induced by TNF-related apoptosis inducing-ligand (TRAIL). The study also found a novel up-regulated expression of TRPM7 in PC-3 cells after treating with TRAIL. Suppression of TRPM7 by TRPM7 non-specific inhibitors (Gd3+ or 2-aminoethoxy diphenylborate (2-APB) ) not only markedly eliminated TRPM7 expression level, but also increased the apoptosis of TRAIL-treated PC-3 cells, which may be regulated by the phosphatidylinositol 3-kinase/protein kinase B (PI3K/AKT) signaling pathway accompany with up-regulated expression of cleaved Caspase-3, (TRAIL-receptor 1, death receptors 4) DR4, and (TRAIL-receptor 2, death receptors 5) DR5. Taken together, our findings strongly suggested that TRPM7 was involved in the apoptosis of PC-3 cells induced by TRAIL, indicating that TRPM7 may be applied as a therapeutic target for PCa.
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Affiliation(s)
- Chang-Ming Lin
- Department of Urology, The First Affiliated Hospital of Anhui Medical University, Hefei, China E-mail :
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Voltage-Gated K+ Channel, Kv3.3 Is Involved in Hemin-Induced K562 Differentiation. PLoS One 2016; 11:e0148633. [PMID: 26849432 PMCID: PMC4743930 DOI: 10.1371/journal.pone.0148633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 01/20/2016] [Indexed: 12/31/2022] Open
Abstract
Voltage-gated K+ (Kv) channels are well known to be involved in cell proliferation. However, even though cell proliferation is closely related to cell differentiation, the relationship between Kv channels and cell differentiation remains poorly investigated. This study demonstrates that Kv3.3 is involved in K562 cell erythroid differentiation. Down-regulation of Kv3.3 using siRNA-Kv3.3 increased hemin-induced K562 erythroid differentiation through decreased activation of signal molecules such as p38, cAMP response element-binding protein, and c-fos. Down-regulation of Kv3.3 also enhanced cell adhesion by increasing integrin β3 and this effect was amplified when the cells were cultured with fibronectin. The Kv channels, or at least Kv3.3, appear to be associated with cell differentiation; therefore, understanding the mechanisms of Kv channel regulation of cell differentiation would provide important information regarding vital cellular processes.
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126
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Martial S. Involvement of ion channels and transporters in carcinoma angiogenesis and metastasis. Am J Physiol Cell Physiol 2016; 310:C710-27. [PMID: 26791487 DOI: 10.1152/ajpcell.00218.2015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Angiogenesis is a finely tuned process, which is the result of the equilibrium between pro- and antiangiogenic factors. In solid tumor angiogenesis, the balance is highly in favor of the production of new, but poorly functional blood vessels, initially intended to provide growing tumors with nutrients and oxygen. Among the numerous proteins involved in tumor development, several types of ion channels are overexpressed in tumor cells, as well as in stromal and endothelial cells. Ion channels thus actively participate in the different hallmarks of cancer, especially in tumor angiogenesis and metastasis. Indeed, from their strategic localization in the plasma membrane, ion channels are key operators of cell signaling, as they sense and respond to environmental changes. This review aims to decipher how ion channels of different families are intricately involved in the fundamental angiogenesis and metastasis hallmarks, which lead from a nascent tumor to systemic dissemination. An overview of the possible use of ion channels as therapeutic targets will also be given, showing that ion channel inhibitors or specific antibodies may provide effective tools, in the near future, in the treatment of carcinomas.
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Affiliation(s)
- Sonia Martial
- Institut de Recherche sur le Cancer et le Vieillissement, CNRS UMR 7284, Inserm U1081, Université Nice-Sophia Antipolis, Nice, France
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127
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Guo R, Pan F, Tian Y, Li H, Li S, Cao C. Down-Regulation of ClC-3 Expression Reduces Epidermal Stem Cell Migration by Inhibiting Volume-Activated Chloride Currents. J Membr Biol 2016; 249:281-92. [DOI: 10.1007/s00232-015-9867-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/30/2015] [Indexed: 01/10/2023]
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128
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Galán-Cobo A, Ramírez-Lorca R, Echevarría M. Role of aquaporins in cell proliferation: What else beyond water permeability? Channels (Austin) 2016; 10:185-201. [PMID: 26752515 PMCID: PMC4954585 DOI: 10.1080/19336950.2016.1139250] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 12/30/2015] [Accepted: 12/31/2015] [Indexed: 02/07/2023] Open
Abstract
In addition to the extensive data demonstrating the importance of mammalian AQPs for the movement of water and some small solutes across the cell membrane, there is now a growing body of evidence indicating the involvement of these proteins in numerous cellular processes seemingly unrelated, at least some of them in a direct way, to their canonical function of water permeation. Here, we have presented a broad range of evidence demonstrating that these proteins have a role in cell proliferation by various different mechanisms, namely, by allowing fast cell volume regulation during cell division; by affecting progression of cell cycle and helping maintain the balance between proliferation and apoptosis, and by crosstalk with other cell membrane proteins or transcription factors that, in turn, modulate progression of the cell cycle or regulate biosynthesis pathways of cell structural components. In the end, however, after discussing all these data that strongly support a role for AQPs in the cell proliferation process, it remains impossible to conclude that all these other functions attributed to AQPs occur completely independently of their water permeability, and there is a need for new experiments designed specifically to address this interesting issue.
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Affiliation(s)
- Ana Galán-Cobo
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla (Departamento de Fisiología Médica y Biofísica), Seville, Spain
| | - Reposo Ramírez-Lorca
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla (Departamento de Fisiología Médica y Biofísica), Seville, Spain
| | - Miriam Echevarría
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla (Departamento de Fisiología Médica y Biofísica), Seville, Spain
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129
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Chen Q, Tao J, Hei H, Li F, Wang Y, Peng W, Zhang X. Up-Regulatory Effects of Curcumin on Large Conductance Ca2+-Activated K+ Channels. PLoS One 2015; 10:e0144800. [PMID: 26672753 PMCID: PMC4682634 DOI: 10.1371/journal.pone.0144800] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 11/24/2015] [Indexed: 12/21/2022] Open
Abstract
Large conductance Ca2+-activated potassium channels (BK) are targets for research that explores therapeutic means to various diseases, owing to the roles of the channels in mediating multiple physiological processes in various cells and tissues. We investigated the pharmacological effects of curcumin, a compound isolated from the herb Curcuma longa, on BK channels. As recorded by whole-cell patch-clamp, curcumin increased BK (α) and BK (α+β1) currents in transfected HEK293 cells as well as the current density of BK in A7r5 smooth muscle cells in a dose-dependent manner. By incubating with curcumin for 24 hours, the current density of exogenous BK (α) in HEK293 cells and the endogenous BK in A7r5 cells were both enhanced notably, though the steady-state activation of the channels did not shift significantly, except for BK (α+β1). Curcumin up-regulated the BK protein expression without changing its mRNA level in A7r5 cells. The surface expression and the half-life of BK channels were also increased by curcumin in HEK293 cells. These effects of curcumin were abolished by MG-132, a proteasome inhibitor. Curcumin also increased ERK 1/2 phosphorylation, while inhibiting ERK by U0126 attenuated the curcumin-induced up-regulation of BK protein expression. We also observed that the curcumin-induced relaxation in the isolated rat aortic rings was significantly attenuated by paxilline, a BK channel specific blocker. These results show that curcumin enhances the activity of the BK channels by interacting with BK directly as well as enhancing BK protein expression through inhibiting proteasomal degradation and activating ERK signaling pathway. The findings suggest that curcumin is a potential BK channel activator and provide novel insight into its complicated pharmacological effects and the underlying mechanisms.
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Affiliation(s)
- Qijing Chen
- Department of Pharmacology, School of Pharmacy, Fudan University, 826 Zhangheng Road, Pudong New District, Shanghai, 201203, China
| | - Jie Tao
- Department of Pharmacology, School of Pharmacy, Fudan University, 826 Zhangheng Road, Pudong New District, Shanghai, 201203, China
- Department of Nephrology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine,164 Lanxi road, Shanghai, 200062, China
| | - Hongya Hei
- Department of Pharmacology, School of Pharmacy, Fudan University, 826 Zhangheng Road, Pudong New District, Shanghai, 201203, China
| | - Fangping Li
- Department of Pharmacology, School of Pharmacy, Fudan University, 826 Zhangheng Road, Pudong New District, Shanghai, 201203, China
| | - Yunman Wang
- Department of Nephrology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine,164 Lanxi road, Shanghai, 200062, China
| | - Wen Peng
- Department of Nephrology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine,164 Lanxi road, Shanghai, 200062, China
- * E-mail: (XZ); (WP)
| | - Xuemei Zhang
- Department of Pharmacology, School of Pharmacy, Fudan University, 826 Zhangheng Road, Pudong New District, Shanghai, 201203, China
- * E-mail: (XZ); (WP)
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130
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Pai VP, Martyniuk CJ, Echeverri K, Sundelacruz S, Kaplan DL, Levin M. Genome-wide analysis reveals conserved transcriptional responses downstream of resting potential change in Xenopus embryos, axolotl regeneration, and human mesenchymal cell differentiation. ACTA ACUST UNITED AC 2015; 3:3-25. [PMID: 27499876 PMCID: PMC4857752 DOI: 10.1002/reg2.48] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 08/20/2015] [Accepted: 08/25/2015] [Indexed: 12/14/2022]
Abstract
Endogenous bioelectric signaling via changes in cellular resting potential (Vmem) is a key regulator of patterning during regeneration and embryogenesis in numerous model systems. Depolarization of Vmem has been functionally implicated in dedifferentiation, tumorigenesis, anatomical re‐specification, and appendage regeneration. However, no unbiased analyses have been performed to understand genome‐wide transcriptional responses to Vmem change in vivo. Moreover, it is unknown which genes or gene networks represent conserved targets of bioelectrical signaling across different patterning contexts and species. Here, we use microarray analysis to comparatively analyze transcriptional responses to Vmem depolarization. We compare the response of the transcriptome during embryogenesis (Xenopus development), regeneration (axolotl regeneration), and stem cell differentiation (human mesenchymal stem cells in culture) to identify common networks across model species that are associated with depolarization. Both subnetwork enrichment and PANTHER analyses identified a number of key genetic modules as targets of Vmem change, and also revealed important (well‐conserved) commonalities in bioelectric signal transduction, despite highly diverse experimental contexts and species. Depolarization regulates specific transcriptional networks across all three germ layers (ectoderm, mesoderm, and endoderm) such as cell differentiation and apoptosis, and this information will be used for developing mechanistic models of bioelectric regulation of patterning. Moreover, our analysis reveals that Vmem change regulates transcripts related to important disease pathways such as cancer and neurodegeneration, which may represent novel targets for emerging electroceutical therapies.
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Affiliation(s)
- Vaibhav P Pai
- Biology Department and Center for Regenerative and Developmental Biology Tufts University Medford Massachusetts 02155 USA
| | - Christopher J Martyniuk
- Center for Environmental and Human Toxicology and Department of Physiological Sciences UF Genetics Institute, University of Florida Gainesville Florida 32611 USA
| | - Karen Echeverri
- Department of Genetics, Cell Biology and Development University of Minnesota Minneapolis Minnesota 55455 USA
| | - Sarah Sundelacruz
- Department of Biomedical Engineering Tufts University Medford Massachusetts 02155 USA
| | - David L Kaplan
- Department of Biomedical Engineering Tufts University Medford Massachusetts 02155 USA
| | - Michael Levin
- Biology Department and Center for Regenerative and Developmental Biology Tufts University Medford Massachusetts 02155 USA
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131
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Mohammed FH, Khajah MA, Yang M, Brackenbury WJ, Luqmani YA. Blockade of voltage-gated sodium channels inhibits invasion of endocrine-resistant breast cancer cells. Int J Oncol 2015; 48:73-83. [PMID: 26718772 PMCID: PMC4734602 DOI: 10.3892/ijo.2015.3239] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 09/24/2015] [Indexed: 12/18/2022] Open
Abstract
Voltage-gated Na+ channels (VGSCs) are membrane proteins which are normally expressed in excitable cells but have also been detected in cancer cells, where they are thought to be involved in malignancy progression. In this study we examined the ion current and expression profile of VGSC (Nav1.5) in estrogen receptor (ER)-positive (MCF-7) and silenced (pII) breast cancer cells and its possible influence on their proliferation, motility and invasion. VGSC currents were analysed by whole cell patch clamp recording. Nav1.5 expression and localization, in response to EGF stimulation, was examined by western blotting and immunofluorescence respectively. Cell invasion (under-agarose and Matrigel assays), motility (wound healing assay) and proliferation (MTT assay) were assessed in pII cells in response to VGSC blockers, phenytoin (PHT) and tetrodotoxin (TTX), or by siRNA knockdown of Nav1.5. The effect of PHT and TTX on modulating EGF-induced phosphorylation of Akt and ERK1/2 was determined by western blotting. Total matrix metalloproteinase (MMP) was determined using a fluorometric-based activity assay. The level of various human proteases was detected by using proteome profiler array kit. VGSC currents were detected in pII cells, but were absent in MCF-7. Nav1.5 showed cytoplasmic and perinuclear expression in both MCF-7 and pII cells, with enhanced expression upon EGF stimulation. Treatment of pII cells with PHT, TTX or siRNA significantly reduced invasion towards serum components and EGF, in part through reduction of P-ERK1/2 and proteases such as cathepsin E, kallikrein-10 and MMP-7, as well as total MMP activity. At high concentrations, PHT inhibited motility while TTX reduced cell proliferation. Pharmacological or genetic blockade of Nav1.5 may serve as a potential anti-metastatic therapy for breast cancer.
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Affiliation(s)
| | | | - Ming Yang
- Department of Biology, University of York, Heslington, York, YO10 5DD, UK
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132
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Biller A, Badde S, Nagel A, Neumann JO, Wick W, Hertenstein A, Bendszus M, Sahm F, Benkhedah N, Kleesiek J. Improved Brain Tumor Classification by Sodium MR Imaging: Prediction of IDH Mutation Status and Tumor Progression. AJNR Am J Neuroradiol 2015; 37:66-73. [PMID: 26494691 DOI: 10.3174/ajnr.a4493] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 06/09/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE MR imaging in neuro-oncology is challenging due to inherent ambiguities in proton signal behavior. Sodium-MR imaging may substantially contribute to the characterization of tumors because it reflects the functional status of the sodium-potassium pump and sodium channels. MATERIALS AND METHODS Sodium-MR imaging data of patients with treatment-naïve glioma WHO grades I-IV (n = 34; mean age, 51.29 ± 17.77 years) were acquired by using a 7T MR system. For acquisition of sodium-MR images, we applied density-adapted 3D radial projection reconstruction pulse sequences. Proton-MR imaging data were acquired by using a 3T whole-body system. RESULTS We demonstrated that the initial sodium signal of a treatment-naïve brain tumor is a significant predictor of isocitrate dehydrogenase (IDH) mutation status (P < .001). Moreover, independent of this correlation, the Cox proportional hazards model confirmed the sodium signal of treatment-naïve brain tumors as a predictor of progression (P = .003). Compared with the molecular signature of IDH mutation status, information criteria of model comparison revealed that the sodium signal is even superior to IDH in progression prediction. In addition, sodium-MR imaging provides a new approach to noninvasive tumor classification. The sodium signal of contrast-enhancing tumor portions facilitates differentiation among most glioma types (P < .001). CONCLUSIONS The information of sodium-MR imaging may help to classify neoplasias at an early stage, to reduce invasive tissue characterization such as stereotactic biopsy specimens, and overall to promote improved and individualized patient management in neuro-oncology by novel imaging signatures of brain tumors.
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Affiliation(s)
- A Biller
- From the Departments of Neuroradiology (A.B., M.B., J.K.) Departments of Radiology (A.B., J.K.)
| | - S Badde
- Department of Biological Psychology and Neuropsychology (S.B.), University of Hamburg, Hamburg, Germany
| | - A Nagel
- Medical Physics in Radiology (A.N., N.B.), German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | | | - W Wick
- Neuro-Oncology (W.W., A.H.)
| | | | - M Bendszus
- From the Departments of Neuroradiology (A.B., M.B., J.K.)
| | | | - N Benkhedah
- Medical Physics in Radiology (A.N., N.B.), German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - J Kleesiek
- From the Departments of Neuroradiology (A.B., M.B., J.K.) Multidimensional Image Processing Group (J.K.), HCI/IWR, University of Heidelberg, Heidelberg, Germany Departments of Radiology (A.B., J.K.)
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133
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Hu L, Li LL, Lin ZG, Jiang ZC, Li HX, Zhao SG, Yang KB. Blockage of potassium channel inhibits proliferation of glioma cells via increasing reactive oxygen species. Oncol Res 2015; 22:57-65. [PMID: 25700359 PMCID: PMC7592800 DOI: 10.3727/096504014x14098532393518] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The potassium (K+) channel plays an important role in the cell cycle and proliferation of tumor cells, while its role in brain glioma cells and the signaling pathways remains unclear. We used tetraethylammonium (TEA), a nonselective antagonist of big conductance K+ channels, to block K+ channels in glioma cells, and antioxidant N-acetyl-l-cysteine (NAC) to inhibit production of intracellular reactive oxygen species (ROS). TEA showed an antiproliferation effect on C6 and U87 glioma cells in a time-dependent manner, which was accompanied by an increased intracellular ROS level. Antioxidant NAC pretreatment reversed TEA-mediated antiproliferation and restored ROS level. TEA treatment also caused significant increases in mRNA and protein levels of tumor-suppressor proteins p53 and p21, and the upregulation was attenuated by pretreatment of NAC. Our results suggest that K+ channel activity significantly contributes to brain glioma cell proliferation via increasing ROS, and it might be an upstream factor triggering the activation of the p53/p21Cip1-dependent signaling pathway, consequently leading to glioma cell cycle arrest.
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Affiliation(s)
- Li Hu
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
| | - Li-Li Li
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
| | - Zhi-Guo Lin
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
| | - Zhi-Chao Jiang
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
| | - Hong-Xing Li
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
| | - Shi-Guang Zhao
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
| | - Kong-Bin Yang
- Department of Neurosurgery, the First Affiliated Hospital of Harbin Medical UniversityHarbinChina
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134
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X-ray irradiation activates K+ channels via H2O2 signaling. Sci Rep 2015; 5:13861. [PMID: 26350345 PMCID: PMC4642570 DOI: 10.1038/srep13861] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 08/07/2015] [Indexed: 02/07/2023] Open
Abstract
Ionizing radiation is a universal tool in tumor therapy but may also cause secondary cancers or cell invasiveness. These negative side effects could be causally related to the human-intermediate-conductance Ca2+-activated-K+-channel (hIK), which is activated by X-ray irradiation and affects cell proliferation and migration. To analyze the signaling cascade downstream of ionizing radiation we use genetically encoded reporters for H2O2 (HyPer) and for the dominant redox-buffer glutathione (Grx1-roGFP2) to monitor with high spatial and temporal resolution, radiation-triggered excursions of H2O2 in A549 and HEK293 cells. The data show that challenging cells with ≥1 Gy X-rays or with UV-A laser micro-irradiation causes a rapid rise of H2O2 in the nucleus and in the cytosol. This rise, which is determined by the rate of H2O2 production and glutathione-buffering, is sufficient for triggering a signaling cascade that involves an elevation of cytosolic Ca2+ and eventually an activation of hIK channels.
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135
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Receptor channel TRPC6 orchestrate the activation of human hepatic stellate cell under hypoxia condition. Exp Cell Res 2015; 336:66-75. [DOI: 10.1016/j.yexcr.2015.03.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/08/2015] [Accepted: 03/26/2015] [Indexed: 02/02/2023]
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136
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Felipe AV, Oliveira J, Chang PYJ, Moraes AADFS, da Silva TD, Tucci-Viegas VM, Forones NM. RNA interference: a promising therapy for gastric cancer. Asian Pac J Cancer Prev 2015; 15:5509-15. [PMID: 25081656 DOI: 10.7314/apjcp.2014.15.14.5509] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Gastric cancer (GC) remains a virtually incurable disease when metastatic and requires early screening tools for detection of early tumor stages. Therefore, finding effective strategies for prevention or recurrence of GC has become a major overall initiative. RNA-interference (RNAi) is an innovative technique that can significantly regulate the expression of oncogenes involved in gastric carcinogenesis, thus constituting a promising epigenetic approach to GC therapy. This review presents recent advances concerning the promising biomolecular mechanism of RNAi for GC treatment.
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Affiliation(s)
- Aledson Vitor Felipe
- Department of Medicine, Gastroenterology Division, Federal University of Sao Paulo, Sao Paulo, Brazil E-mail :
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137
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Single Cell Electrical Characterization Techniques. Int J Mol Sci 2015; 16:12686-712. [PMID: 26053399 PMCID: PMC4490468 DOI: 10.3390/ijms160612686] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 04/13/2015] [Indexed: 01/09/2023] Open
Abstract
Electrical properties of living cells have been proven to play significant roles in understanding of various biological activities including disease progression both at the cellular and molecular levels. Since two decades ago, many researchers have developed tools to analyze the cell’s electrical states especially in single cell analysis (SCA). In depth analysis and more fully described activities of cell differentiation and cancer can only be accomplished with single cell analysis. This growing interest was supported by the emergence of various microfluidic techniques to fulfill high precisions screening, reduced equipment cost and low analysis time for characterization of the single cell’s electrical properties, as compared to classical bulky technique. This paper presents a historical review of single cell electrical properties analysis development from classical techniques to recent advances in microfluidic techniques. Technical details of the different microfluidic techniques are highlighted, and the advantages and limitations of various microfluidic devices are discussed.
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138
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Jang SH, Byun JK, Jeon WI, Choi SY, Park J, Lee BH, Yang JE, Park JB, O'Grady SM, Kim DY, Ryu PD, Joo SW, Lee SY. Nuclear localization and functional characteristics of voltage-gated potassium channel Kv1.3. J Biol Chem 2015; 290:12547-57. [PMID: 25829491 PMCID: PMC4432276 DOI: 10.1074/jbc.m114.561324] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 03/26/2015] [Indexed: 12/29/2022] Open
Abstract
It is widely known that ion channels are expressed in the plasma membrane. However, a few studies have suggested that several ion channels including voltage-gated K(+) (Kv) channels also exist in intracellular organelles where they are involved in the biochemical events associated with cell signaling. In the present study, Western blot analysis using fractionated protein clearly indicates that Kv1.3 channels are expressed in the nuclei of MCF7, A549, and SNU-484 cancer cells and human brain tissues. In addition, Kv1.3 is located in the plasma membrane and the nucleus of Jurkat T cells. Nuclear membrane hyperpolarization after treatment with margatoxin (MgTX), a specific blocker of Kv1.3 channels, provides evidence for functional channels at the nuclear membrane of A549 cells. MgTX-induced hyperpolarization is abolished in the nuclei of Kv1.3 silenced cells, and the effects of MgTX are dependent on the magnitude of the K(+) gradient across the nuclear membrane. Selective Kv1.3 blockers induce the phosphorylation of cAMP response element-binding protein (CREB) and c-Fos activation. Moreover, Kv1.3 is shown to form a complex with the upstream binding factor 1 in the nucleus. Chromatin immunoprecipitation assay reveals that Sp1 transcription factor is directly bound to the promoter region of the Kv1.3 gene, and the Sp1 regulates Kv1.3 expression in the nucleus of A549 cells. These results demonstrate that Kv1.3 channels are primarily localized in the nucleus of several types of cancer cells and human brain tissues where they are capable of regulating nuclear membrane potential and activation of transcription factors, such as phosphorylated CREB and c-Fos.
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Affiliation(s)
- Soo Hwa Jang
- From the Laboratories of Veterinary Pharmacology and the Biomedical Research Center, School of Biological Sciences, University of Ulsan, Ulsan 680-749, Korea
| | - Jun Kyu Byun
- From the Laboratories of Veterinary Pharmacology and
| | - Won-Il Jeon
- From the Laboratories of Veterinary Pharmacology and
| | | | - Jin Park
- the Department of Chemistry, Soongsil University, Seoul 156-743, Korea
| | - Bo Hyung Lee
- From the Laboratories of Veterinary Pharmacology and
| | - Ji Eun Yang
- From the Laboratories of Veterinary Pharmacology and
| | - Jin Bong Park
- the Department of Physiology, School of Medicine, Chungnam National University, Daejeon 305-764, Korea, and
| | - Scott M O'Grady
- the Department of Animal Science and Integrative Biology and Physiology, University of Minnesota, St. Paul, Minnesota 55455
| | - Dae-Yong Kim
- Veterinary Pathology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 151-742, Korea
| | - Pan Dong Ryu
- From the Laboratories of Veterinary Pharmacology and
| | - Sang-Woo Joo
- the Department of Chemistry, Soongsil University, Seoul 156-743, Korea
| | - So Yeong Lee
- From the Laboratories of Veterinary Pharmacology and
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139
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Squecco R, Tani A, Zecchi-Orlandini S, Formigli L, Francini F. Melatonin affects voltage-dependent calcium and potassium currents in MCF-7 cell line cultured either in growth or differentiation medium. Eur J Pharmacol 2015; 758:40-52. [PMID: 25843408 DOI: 10.1016/j.ejphar.2015.03.068] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 03/24/2015] [Accepted: 03/25/2015] [Indexed: 11/29/2022]
Abstract
Big efforts have been dedicated up to now to identify novel targets for cancer treatment. The peculiar biophysical profile and the atypical ionic channels activity shown by diverse types of human cancers suggest that ion channels may be possible targets in cancer therapy. Earlier studies have shown that melatonin exerts an oncostatic action on different tumors. In particular, it was shown that melatonin was able to inhibit growth/viability and proliferation, to reduce the invasiveness and metastatic properties of human estrogen-sensitive breast adenocarcinoma MCF-7 cell line cultured in growth medium, with substantial impairments of epidermal growth factor (EGF) and Notch-1-mediated signaling. The purpose of this work was to evaluate on MCF-7 cells the possible effects of melatonin on the biophysical features known to have a role in proliferation and differentiation, by using the patch-clamp technique. Our results show that in cells cultured in growth as well as in differentiation medium melatonin caused a hyperpolarization of resting membrane potential paralleled by significant changes of the inward Ca(2+) currents (T- and L-type), outward delayed rectifier K(+) currents and cell capacitance. All these effects are involved in MCF-7 growth and differentiation. These findings strongly suggest that melatonin, acting as a modulator of different voltage-dependent ion channels, might be considered a new promising tool for specifically disrupting cell viability and differentiation pathways in tumour cells with possible beneficial effects on cancer therapy.
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Affiliation(s)
- Roberta Squecco
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy
| | - Alessia Tani
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, 50134 Florence, Italy
| | - Sandra Zecchi-Orlandini
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy
| | - Lucia Formigli
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, 50134 Florence, Italy
| | - Fabio Francini
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy.
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140
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Hao J, Bao X, Jin B, Wang X, Mao Z, Li X, Wei L, Shen D, Wang JL. Ca2+ channel subunit α 1D promotes proliferation and migration of endometrial cancer cells mediated by 17β-estradiol via the G protein-coupled estrogen receptor. FASEB J 2015; 29:2883-93. [PMID: 25805831 DOI: 10.1096/fj.14-265603] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 03/05/2015] [Indexed: 12/15/2022]
Abstract
Calcium and calcium channels are closely related to the estrogen-induced nongenomic effect of endometrial carcinoma, but the specific role of calcium channels is unknown. This study aimed to explore the expression and the biologic effect of the L-type calcium channel in endometrial carcinoma cells and to clarify the molecular mechanism of the relationship between L-type calcium channels and estrogen. The immunohistochemical results showed that Ca(2+) channel subunit α 1D (Cav1.3) expression was high in atypical hyperplasia (1.90 ± 0.35) and endometrial carcinoma tissues (2.05 ± 0.82) but weak (0.80 ± 0.15) in benign endometrial tissues (P < 0.05). Treatment with 17β-estradiol rapidly increased Cav1.3 expression in a dose- and time-dependent manner, and 100 nM cell-impermeable β-estradiol-6-(O-carboxymethyl)oxime:bovine serum albumin also promoted Cav1.3 expression. Transfection with small interfering RNA against G protein-coupled estrogen receptor (GPER) suppressed estrogen-induced up-regulation of Cav1.3 compared with control cells and markedly reduced the estrogen-induced phosphorylation of ERK1/2 and CREB. Knocking down the Cav1.3 significantly suppressed estrogen-stimulated Ca(2+) influx, cell proliferation, and migration in endometrial cancer cells. Taken together, Cav1.3 was overexpressed in atypical hyperplasia and endometrial carcinoma, and the estrogen-induced phosphorylation of downstream molecular ERK1/2 and CREB is the result of activation of the GPER pathway. L-type channel Cav1.3 is required for estrogen-stimulated Ca(2+) influx and contributes broadly to the development of endometrial cancer. The Cav1.3 channel may be a new target for endometrial carcinoma treatment.
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Affiliation(s)
- Juan Hao
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Xiaoxia Bao
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Bo Jin
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Xiujuan Wang
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Zebin Mao
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Xiaoping Li
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Lihui Wei
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Danhua Shen
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
| | - Jian-Liu Wang
- *Department of Obstetrics and Gynaecology and Department of Pathology, Peking University People's Hospital, Beijing, China; and Department of Biochemistry and Molecular Biology, Peking University, Beijing, China
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141
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Vegara-Meseguer JM, Pérez-Sánchez H, Araujo R, Martín F, Soria B. L-Type Ca(2+) Channels and SK Channels in Mouse Embryonic Stem Cells and Their Contribution to Cell Proliferation. J Membr Biol 2015; 248:671-82. [PMID: 25666166 DOI: 10.1007/s00232-015-9779-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 01/23/2015] [Indexed: 12/12/2022]
Abstract
Mouse embryonic stem cells (mESCs) are capable of both self-renewal and multilineage differentiation; thus, they can be expanded in vivo or in vitro and differentiated to produce different cell types. Despite their biological and medical interest, many physiological properties of undifferentiated mESCs, such as ion channel function, are not fully understood. Ion channels are thought to be involved in cell proliferation and differentiation. The aim of this study was to characterize functional ion channels in cultured undifferentiated mESCs and their role in cell proliferation. L-type voltage-activated Ca(2+) channels sensitive to nifedipine and small-conductance Ca(2+)-activated K(+) (SK) channels sensitive to apamin were identified. Ca(2+)-activated K(+) currents were blocked by millimolar concentrations of tetraethylammonium. The effects of Ca(2+) channel and Ca(2+)-activated K(+) channel blockers on the proliferation of undifferentiated mESCs were investigated by bromodeoxyuridine (BrdU) incorporation. Dihydropyridine derivatives, such as nifedipine, inhibited cell growth and BrdU incorporation into the cells, whereas apamin, which selectively blocks SK channels, had no effect on cell growth. These results demonstrate that functional voltage-operated Ca(2+) channels and Ca(2+)-activated K(+) channels are present in undifferentiated mESCs. Moreover, voltage-gated L-type Ca(2+) channels, but not SK channels, might be necessary for proliferation of undifferentiated mESCs.
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Affiliation(s)
- Josefina M Vegara-Meseguer
- Escuela Politécnica Superior, Universidad Católica de Murcia (UCAM), Campus de Los Jerónimos, 30107, Guadalupe, Murcia, Spain,
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142
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Abdolahad M, Saeidi A, Janmaleki M, Mashinchian O, Taghinejad M, Taghinejad H, Azimi S, Mahmoudi M, Mohajerzadeh S. A single-cell correlative nanoelectromechanosensing approach to detect cancerous transformation: monitoring the function of F-actin microfilaments in the modulation of the ion channel activity. NANOSCALE 2015; 7:1879-1887. [PMID: 25524888 DOI: 10.1039/c4nr06102k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Cancerous transformation may be dependent on correlation between electrical disruptions in the cell membrane and mechanical disruptions of cytoskeleton structures. Silicon nanotube (SiNT)-based electrical probes, as ultra-accurate signal recorders with subcellular resolution, may create many opportunities for fundamental biological research and biomedical applications. Here, we used this technology to electrically monitor cellular mechanosensing. The SiNT probe was combined with an electrically activated glass micropipette aspiration system to achieve a new cancer diagnostic technique that is based on real-time correlation between mechanical and electrical behaviour of single cells. Our studies demonstrated marked changes in the electrical response following increases in the mechanical aspiration force in healthy cells. In contrast, such responses were extremely weak for malignant cells. Confocal microscopy results showed the impact of actin microfilament remodelling on the reduction of the electrical response for aspirated cancer cells due to the significant role of actin in modulating the ion channel activity in the cell membrane.
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Affiliation(s)
- Mohammad Abdolahad
- Nanoelectronic Center of Excellence, Thin Film and Nanoelectronic Lab, School of Electrical and Computer Engineering, University of Tehran, P.O. Box 14395/515, Tehran, Iran
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143
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Warnier M, Roudbaraki M, Derouiche S, Delcourt P, Bokhobza A, Prevarskaya N, Mariot P. CACNA2D2 promotes tumorigenesis by stimulating cell proliferation and angiogenesis. Oncogene 2015; 34:5383-94. [PMID: 25619833 DOI: 10.1038/onc.2014.467] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 11/05/2014] [Accepted: 12/19/2014] [Indexed: 01/16/2023]
Abstract
In the present study, we have assessed whether a putative calcium channel α2δ2 auxiliary subunit (CACNA2D2 gene) could be involved in prostate cancer (PCA) progression. We therefore carried out experiments to determine whether this protein is expressed in PCA LNCaP cells and in PCA tissues, and whether its expression may be altered during cancer development. In addition, we evaluated the influence on cell proliferation of overexpressing or downregulating this subunit. In vitro experiments show that α2δ2 subunit overexpression is associated with increased cell proliferation, alterations of calcium homeostasis and the recruitment of a nuclear factor of activated T-cells pathway. Furthermore, we carried out in vivo experiments on immuno-deficient nude mice in order to evaluate the tumorigenic potency of the α2δ2 subunit. We show that α2δ2-overexpressing PCA LNCaP cells are more tumorigenic than control LNCaP cells when injected into nude mice. In addition, gabapentin, a ligand of α2δ2, reduces tumor development in LNCaP xenografts. Finally, we show that the action of α2δ2 on tumor development occurs not only through a stimulation of proliferation, but also through a stimulation of angiogenesis, via an increased secretion of vascular endothelial growth factor in cells overexpressing α2δ2.
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Affiliation(s)
- M Warnier
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
| | - M Roudbaraki
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
| | - S Derouiche
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
| | - P Delcourt
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
| | - A Bokhobza
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
| | - N Prevarskaya
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
| | - P Mariot
- Laboratoire de Physiologie Cellulaire, INSERM U1003, Villeneuve d'Ascq Cédex, France
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144
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Chernet BT, Levin M. Transmembrane voltage potential of somatic cells controls oncogene-mediated tumorigenesis at long-range. Oncotarget 2015; 5:3287-306. [PMID: 24830454 PMCID: PMC4102810 DOI: 10.18632/oncotarget.1935] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The microenvironment is increasingly recognized as a crucial aspect of cancer. In contrast and complement to the field's focus on biochemical factors and extracellular matrix, we characterize a novel aspect of host:tumor interaction - endogenous bioelectric signals among non-excitable somatic cells. Extending prior work focused on the bioelectric state of cancer cells themselves, we show for the first time that the resting potentials of distant cells are critical for oncogene-dependent tumorigenesis. In the Xenopus laevis tadpole model, we used human oncogenes such as mutant KRAS to drive formation of tumor-like structures that exhibited overproliferation, increased nuclear size, hypoxia, acidity, and leukocyte attraction. Remarkably, misexpression of hyperpolarizing ion channels at distant sites within the tadpole significantly reduced the incidence of these tumors. The suppression of tumorigenesis could also be achieved by hyperpolarization using native CLIC1 chloride channels, suggesting a treatment modality not requiring gene therapy. Using a dominant negative approach, we implicate HDAC1 as the mechanism by which resting potential changes affect downstream cell behaviors. Based on published data on the voltage-mediated changes of butyrate flux through the SLC5A8 transporter, we present a model linking resting potentials of host cells to the ability of oncogenes to initiate tumorigenesis. Antibiotic data suggest that the relevant butyrate is generated by a native bacterial species, identifying a novel link between the microbiome and cancer that is mediated by alterations in bioelectric signaling.
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Affiliation(s)
- Brook T Chernet
- Center for Regenerative and Developmental Biology and Department of Biology Tufts University 200 Boston Avenue,Suite 4600 Medford, MA 02155 U.S.A
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145
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Sui B, Yue X, Tichy MG, Liu T, Belfield KD. Improved Synthesis of the Triazacryptand (TAC) and its Application in the Construction of a Fluorescent TAC-BODIPY Conjugate for K+Sensing in Live Cells. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403600] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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146
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Involvement of potassium channels in the progression of cancer to a more malignant phenotype. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1848:2477-92. [PMID: 25517985 DOI: 10.1016/j.bbamem.2014.12.008] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 12/01/2014] [Accepted: 12/08/2014] [Indexed: 12/22/2022]
Abstract
Potassium channels are a diverse group of pore-forming transmembrane proteins that selectively facilitate potassium flow through an electrochemical gradient. They participate in the control of the membrane potential and cell excitability in addition to different cell functions such as cell volume regulation, proliferation, cell migration, angiogenesis as well as apoptosis. Because these physiological processes are essential for the correct cell function, K+ channels have been associated with a growing number of diseases including cancer. In fact, different K+ channel families such as the voltage-gated K+ channels, the ether à-go-go K+ channels, the two pore domain K+ channels and the Ca2+-activated K+ channels have been associated to tumor biology. Potassium channels have a role in neoplastic cell-cycle progression and their expression has been found abnormal in many types of tumors and cancer cells. In addition, the expression and activity of specific K+ channels have shown a significant correlation with the tumor malignancy grade. The aim of this overview is to summarize published data on K+ channels that exhibit oncogenic properties and have been linked to a more malignant cancer phenotype. This article is part of a Special Issue entitled: Membrane channels and transporters in cancers.
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147
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Extended ultrastructural characterization of chordoma cells: the link to new therapeutic options. PLoS One 2014; 9:e114251. [PMID: 25479055 PMCID: PMC4257693 DOI: 10.1371/journal.pone.0114251] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 11/05/2014] [Indexed: 01/25/2023] Open
Abstract
Chordomas are rare bone tumors, developed from the notochord and largely resistant to chemotherapy. A special feature of this tumor is the heterogeneity of its cells. By combining high pressure freezing (HPF) with electron tomography we were able to illustrate the connections within the cells, the cell-cell interface, and the mitochondria-associated endoplasmic reticulum membrane complex that appears to play a special role among the characteristics of chordoma. These lipid raft-like regions are responsible for lipid syntheses and for calcium signaling. Compared to other tumor cells, chordoma cells show a close connection of rough endoplasmic reticulum and mitochondria, which may influence the sphingolipid metabolism and calcium release. We quantified levels of ceramide and glycosylceramide species by the methyl tert-butyl ether extraction method and we assessed the intracellular calcium concentration with the ratiometric fluorescent dye Fura-2AM. Measurements of the changes in the intracellular calcium concentration revealed an increase in calcium due to the application of acetylcholine. With regard to lipid synthesis, glucosylceramide levels in the chordoma cell line were significantly higher than those in normal healthy cells. The accumulation of glycosylceramide in drug resistant cancer cells has been confirmed in many types of cancer and may also account for drug resistance in chordoma. This study aimed to provide a deep morphological description of chordoma cells, it demonstrated that HPF analysis is useful in elucidating detailed structural information. Furthermore we demonstrate how an accumulation of glycosylceramide in chordoma provides links to drug resistance and opens up the field for new research options.
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148
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Ru Q, Tian X, Pi MS, Chen L, Yue K, Xiong Q, Ma BM, Li CY. Voltage‑gated K+ channel blocker quinidine inhibits proliferation and induces apoptosis by regulating expression of microRNAs in human glioma U87‑MG cells. Int J Oncol 2014; 46:833-40. [PMID: 25420507 DOI: 10.3892/ijo.2014.2777] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/10/2014] [Indexed: 11/06/2022] Open
Abstract
Accumulating evidence has proved that potassium channels (K+ channels) are involved in regulating cell proliferation, cell cycle progression and apoptosis of tumor cells. However, the precise cellular mechanisms are still unknown. In the present study, we investigated the effect and mechanisms of quinidine, a commonly used voltage-gated K+ channel blocker, on cell proliferation and apoptosis of human glioma U87-MG cells. We found that quinidine significantly inhibited the proliferation of U87-MG cells and induced apoptosis in a dose-dependent manner. The results of caspase colorimetric assay showed that the mitochondrial pathway was the main mode involved in the quinidine-induced apoptotic process. Furthermore, the concentration range of quinidine, which inhibited voltage-gated K+ channel currents in electrophysiological assay, was consistent with that of quinidine inhibiting cell proliferation and inducing cell apoptosis. In U87-MG cells treated with quinidine (100 µmol/l), 11 of 2,042 human microRNAs (miRNAs) were upregulated and 16 were downregulated as detected with the miRNA array analysis. The upregulation of miR-149-3p and downregulation of miR-424-5p by quinidine treatment were further verified by using quantitative real-time PCR. In addition, using miRNA target prediction program, putative target genes related to cell proliferation and apoptosis for two differentially expressed miRNAs were predicted. Taken together, these data suggested that the anti-proliferative and pro-apoptosis effect of voltage-gated K+ channel blocker quinidine in human glioma cells was mediated at least partly through regulating expression of miRNAs, and provided further support for the mechanisms of voltage-gated K+ channels in mediating cell proliferation and apoptosis.
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Affiliation(s)
- Qin Ru
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Xiang Tian
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Ming-Shan Pi
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Lin Chen
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Kai Yue
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Qi Xiong
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Bao-Miao Ma
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
| | - Chao-Ying Li
- Wuhan Institutes of Biomedical Sciences, Jianghan University, Wuhan, Hubei 430056, P.R. China
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149
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Hong S, Bi M, Wang L, Kang Z, Ling L, Zhao C. CLC-3 channels in cancer (review). Oncol Rep 2014; 33:507-14. [PMID: 25421907 DOI: 10.3892/or.2014.3615] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 10/30/2014] [Indexed: 11/06/2022] Open
Abstract
Ion channels are involved in regulating cell proliferation and apoptosis (programed cell death). Since increased cellular proliferation and inhibition of apoptosis are characteristic features of tumorigenesis, targeting ion channels is a promising strategy for treating cancer. CLC-3 is a member of the voltage-gated chloride channel superfamily and is expressed in many cancer cells. In the plasma membrane, CLC-3 functions as a chloride channel and is associated with cell proliferation and apoptosis. CLC-3 is also located in intracellular compartments, contributing to their acidity, which increases sequestration of drugs and leads to chemotherapy drug resistance. In this review, we summarize the recent findings concerning the involvement of CLC-3 in cancer and explore its potential in cancer therapy.
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Affiliation(s)
- Sen Hong
- Department of Physiology, The Basic Medical College, Jilin University, Changchun 130021, P.R. China
| | - Miaomiao Bi
- Department of Ophthalmology, The China‑Japan Union Hospital of Jilin University, Jilin University, Changchun 130033, P.R. China
| | - Lei Wang
- Department of Colon and Anal Surgery, The First Hospital of Jilin University, Jilin University, Changchun 130021, P.R. China
| | - Zhenhua Kang
- Department of Colon and Anal Surgery, The First Hospital of Jilin University, Jilin University, Changchun 130021, P.R. China
| | - Limian Ling
- Department of Colon and Anal Surgery, The First Hospital of Jilin University, Jilin University, Changchun 130021, P.R. China
| | - Chunyan Zhao
- Department of Physiology, The Basic Medical College, Jilin University, Changchun 130021, P.R. China
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150
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Ordóñez R, Gallo-Oller G, Martínez-Soto S, Legarra S, Pata-Merci N, Guegan J, Danglot G, Bernheim A, Meléndez B, Rey JA, Castresana JS. Genome-wide microarray expression and genomic alterations by array-CGH analysis in neuroblastoma stem-like cells. PLoS One 2014; 9:e113105. [PMID: 25392930 PMCID: PMC4231109 DOI: 10.1371/journal.pone.0113105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 10/14/2014] [Indexed: 01/08/2023] Open
Abstract
Neuroblastoma has a very diverse clinical behaviour: from spontaneous regression to a very aggressive malignant progression and resistance to chemotherapy. This heterogeneous clinical behaviour might be due to the existence of Cancer Stem Cells (CSC), a subpopulation within the tumor with stem-like cell properties: a significant proliferation capacity, a unique self-renewal capacity, and therefore, a higher ability to form new tumors. We enriched the CSC-like cell population content of two commercial neuroblastoma cell lines by the use of conditioned cell culture media for neurospheres, and compared genomic gains and losses and genome expression by array-CGH and microarray analysis, respectively (in CSC-like versus standard tumor cells culture). Despite the array-CGH did not show significant differences between standard and CSC-like in both analyzed cell lines, the microarray expression analysis highlighted some of the most relevant biological processes and molecular functions that might be responsible for the CSC-like phenotype. Some signalling pathways detected seem to be involved in self-renewal of normal tissues (Wnt, Notch, Hh and TGF-β) and contribute to CSC phenotype. We focused on the aberrant activation of TGF-β and Hh signalling pathways, confirming the inhibition of repressors of TGF-β pathway, as SMAD6 and SMAD7 by RT-qPCR. The analysis of the Sonic Hedgehog pathway showed overexpression of PTCH1, GLI1 and SMO. We found overexpression of CD133 and CD15 in SIMA neurospheres, confirming that this cell line was particularly enriched in stem-like cells. This work shows a cross-talk among different pathways in neuroblastoma and its importance in CSC-like cells.
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Affiliation(s)
- Raquel Ordóñez
- Department of Biochemistry and Genetics, University of Navarra School of Sciences, Pamplona, Spain
| | - Gabriel Gallo-Oller
- Department of Biochemistry and Genetics, University of Navarra School of Sciences, Pamplona, Spain
| | - Soledad Martínez-Soto
- Department of Biochemistry and Genetics, University of Navarra School of Sciences, Pamplona, Spain
| | - Sheila Legarra
- Department of Biochemistry and Genetics, University of Navarra School of Sciences, Pamplona, Spain
| | | | | | | | | | - Bárbara Meléndez
- Molecular Pathology Research Unit, Department of Pathology, Virgen de la Salud Hospital, Toledo, Spain
| | - Juan A. Rey
- IdiPaz Research Unit, La Paz University Hospital, Madrid, Spain
| | - Javier S. Castresana
- Department of Biochemistry and Genetics, University of Navarra School of Sciences, Pamplona, Spain
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