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Sponder G, Abdulhanan N, Fröhlich N, Mastrototaro L, Aschenbach JR, Röntgen M, Pilchova I, Cibulka M, Racay P, Kolisek M. Overexpression of Na +/Mg 2+ exchanger SLC41A1 attenuates pro-survival signaling. Oncotarget 2017; 9:5084-5104. [PMID: 29435164 PMCID: PMC5797035 DOI: 10.18632/oncotarget.23598] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 11/13/2017] [Indexed: 01/07/2023] Open
Abstract
The Na+/Mg2+ exchanger SLC41A1 (A1), a key component of intracellular Mg homeostasis (IMH), is the major cellular Mg2+ efflux system, and its overexpression decreases [Mg2+]intracellular. IMH plays an important role in the regulation of many cellular processes, including cellular signaling. However, whether the overexpression of A1 and the consequent drop of [Mg2+]i impact on intracellular signaling is unknown. To examine the latter, we utilized dynamic mass redistribution (DMR) assay, PathScan® RTK signaling antibody (PRSA) array, confirmatory Western blot (WB) analyses of phosphorylation of kinases selected by PRSA, and mag-fura 2-assisted fast filter spectrometry (FFS). We demonstrate here that the overexpression of A1 quantitatively and qualitatively changes the DMR signal evoked by the application of PAR-1-selective activating peptide and/or by changing [Mg2+]extracellular in HEK293 cells. PRSA profiling of the phosphorylation of important signaling nodes followed by confirmatory WB has revealed that, in HEK293 cells, A1 overexpression significantly attenuates the phosphorylation of Akt/PKB on Thr308 and/or Ser473 and of Erk1/2 on Thr202/Tyr204 in the presence of 0 or 1 mM (physiological) Mg2+ in the bath solution. The latter is also true for SH-SY5Y and HeLa cells. Overexpression of A1 in HEK293 cells significantly lowers [Mg2+]i in the presence of [Mg2+]e = 0 or 1 mM. This correlates with the observed attenuation of prosurvival Akt/PKB - Erk1/2 signaling in these cells. Thus, A1 expression status and [Mg2+]e (and consequently also [Mg2+]i) modulate the complex physiological fingerprint of the cell and influence the activity of kinases involved in anti-apoptotic and, hence, pro-survival events in cells.
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Affiliation(s)
- Gerhard Sponder
- Institute of Veterinary-Physiology, Free University of Berlin, Berlin, Germany
| | - Nasrin Abdulhanan
- Institute of Veterinary-Physiology, Free University of Berlin, Berlin, Germany
| | - Nadine Fröhlich
- PerkinElmer Life and Analytical Sciences GmbH, Rodgau, Germany
| | - Lucia Mastrototaro
- Institute of Veterinary-Physiology, Free University of Berlin, Berlin, Germany
| | - Jörg R Aschenbach
- Institute of Veterinary-Physiology, Free University of Berlin, Berlin, Germany
| | - Monika Röntgen
- Leibnitz Institute for Farm Animal Biology, Department of Muscle and Growth Physiology, Dummerstorf, Germany
| | - Ivana Pilchova
- Biomedical Center Martin, Division of Neurosciences, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
| | - Michal Cibulka
- Institute of Medical Biochemistry, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
| | - Peter Racay
- Biomedical Center Martin, Division of Neurosciences, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia.,Institute of Medical Biochemistry, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
| | - Martin Kolisek
- Institute of Veterinary-Physiology, Free University of Berlin, Berlin, Germany.,Biomedical Center Martin, Division of Neurosciences, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
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Carter RL, Grisanti LA, Yu JE, Repas AA, Woodall M, Ibetti J, Koch WJ, Jacobson MA, Tilley DG. Dynamic mass redistribution analysis of endogenous β-adrenergic receptor signaling in neonatal rat cardiac fibroblasts. Pharmacol Res Perspect 2014; 2. [PMID: 24683488 PMCID: PMC3968527 DOI: 10.1002/prp2.24] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Label-free systems for the agnostic assessment of cellular responses to receptor stimulation have been shown to provide a sensitive method to dissect receptor signaling. β-adenergic receptors (βAR) are important regulators of normal and pathologic cardiac function and are expressed in cardiomyocytes as well as cardiac fibroblasts, where relatively fewer studies have explored their signaling responses. Using label-free whole cell dynamic mass redistribution (DMR) assays we investigated the response patterns to stimulation of endogenous βAR in primary neonatal rat cardiac fibroblasts (NRCF). The EPIC-BT by Corning was used to measure DMR responses in primary isolated NRCF treated with various βAR and EGFR ligands. Additional molecular assays for cAMP generation and receptor internalization responses were used to correlate the DMR findings with established βAR signaling pathways. Catecholamine stimulation of NRCF induced a concentration-dependent negative DMR deflection that was competitively blocked by βAR blockade and non-competitively blocked by irreversible uncoupling of Gs proteins. Subtype-selective βAR ligand profiling revealed a dominant role for β2AR in mediating the DMR responses, consistent with the relative expression levels of β2AR and β1AR in NRCF. βAR-mediated cAMP generation profiles revealed similar kinetics to DMR responses, each of which were enhanced via inhibition of cAMP degradation, as well as dynamin-mediated receptor internalization. Finally, G protein-independent βAR signaling through epidermal growth factor receptor (EGFR) was assessed, revealing a smaller but significant contribution of this pathway to the DMR response to βAR stimulation. Measurement of DMR responses in primary cardiac fibroblasts provides a sensitive readout for investigating endogenous βAR signaling via both G protein-dependent and –independent pathways.
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Affiliation(s)
- Rhonda L Carter
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Laurel A Grisanti
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Justine E Yu
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Ashley A Repas
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Meryl Woodall
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Jessica Ibetti
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Walter J Koch
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Marlene A Jacobson
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
| | - Douglas G Tilley
- Center for Translational Medicine (R.L.C., L.A.G., J.E.Y., A.A.R., M.W., J.I., W.J.K. and D.G.T.) and Department of Pharmacology (W.J.K. and D.G.T.), Temple University School of Medicine, and Moulder Center for Drug Discovery Research and Temple University School of Pharmacy (M.A.J.), Philadelphia, PA 19140, USA
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Deng H, Sun H, Fang Y. Label-free cell phenotypic assessment of the biased agonism and efficacy of agonists at the endogenous muscarinic M3 receptors. J Pharmacol Toxicol Methods 2013; 68:323-33. [PMID: 23933114 DOI: 10.1016/j.vascn.2013.07.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 07/26/2013] [Accepted: 07/30/2013] [Indexed: 01/14/2023]
Abstract
INTRODUCTION Efficacy describes the property of a ligand that enables the receptor to change its behavior towards the host cell, while biased agonism defines the ability of a ligand to differentially activate some of the vectorial pathways over others mediated through the receptor. However, little is known about the molecular basis defining the efficacy of ligands at G protein-coupled receptors. Here we characterize the biased agonism and cell phenotypic efficacy of seven agonists at the endogenous muscarinic M3 receptors in six different cell lines including HT-29, PC-3, HeLa, SF268, CCRF-CEM and HCT-15 cells. METHODS Quantitative real-time PCR and multiple label-free whole cell dynamic mass redistribution (DMR) assays were used to determine the functional muscarinic receptors in each cell line. DMR pathway deconvolution assay was used to determine the pathway biased activity of the muscarinic agonists. Operational agonism model was used to quantify the pathway bias, while macro-kinetic data reported in literature was used to analyze the biochemical mechanism of action of these agonists. RESULTS Quantitative real-time PCR and ligand pharmacology studies showed that all the native cell lines endogenously express functional M3 receptors. Furthermore, different agonists triggered distinct DMR signals in a specific cell line as well as in different cell lines. DMR pathway deconvolution using known G protein modulators revealed that the M3 receptor in all the six cell lines signals through multiple G protein-mediated pathways, and certain agonists display biased agonism in a cell line-dependent manner. The whole cell efficacy and potency of these agonists were found to be sensitive to the assay time as well as the cell background. Correlation analysis suggested that the whole cell efficacy of agonists is correlated well with their macro-dissociation rate constants. DISCUSSION This study implicates that the endogenous M3 receptors are coupled to multiple pathways, and the muscarinic agonists can display distinct biased agonism and whole cell phenotypic efficacy.
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Affiliation(s)
- Huayun Deng
- Biochemical Technologies, Science and Technology Division, Corning Incorporated, Corning, NY 14831, United States
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Abstract
IMPORTANCE OF THE FIELD: Cancer is a collection of diseases that arise from the progressive accumulation of genetic alterations in somatic cells. Genomic approaches have identified a great variety of genetic abnormalities associated with tumorigenesis, and molecular imaging and quantification assays have further elucidated the complex interactions within or between pathways. It is acknowledged that it is proteins, rather than genes, to fulfill most cellular functions; and signaling proteins largely operate through a large and complex network. To this end, cancer is mostly a pathway dysregulated disease - a small number of core pathways are dominate in aberrant cell growth leading to cancer. Thus, understanding the functional consequences of dysregulated and/or mutant signaling proteins in the context of native signaling networks is the frontier in cancer research. AREAS COVERED IN THIS REVIEW: This article reviews why resonant waveguide grating (RWG) biosensor cellular assays are considered to be integrative in nature, and how RWG biosensor can be used for mining the surface markers of cancer cells, and discovering core pathway(s) of cancer receptor signaling. WHAT THE READER WILL GAIN: The reader will gain an overview of cancer biology from pathway perspective, and have a glimpse of potential implications of integrative cellular assays, as promised by RWG biosensor, in cancer research and diagnosis. TAKE HOME MESSAGE: Successful approaches for developing next-generation anti-cancer therapies and diagnostic protocols should take into account that the dysregulation of oncogenic pathways is central to tumorigenesis. The biosensor cellular assays offer unprecedented advantage in characterizing cancer biology. However, significant challenges are also presented in deconvoluting and validating cellular mechanisms identified in cancer receptor signaling using these assays.
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Affiliation(s)
- Ye Fang
- Senior Research Manager, Biochemical Technologies, Science and Technology Division, Corning Inc., Sullivan Park, Corning, NY 14831, Tele: 607-9747203, ,
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