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Toni LS, Carroll IA, Jones KL, Schwisow JA, Minobe WA, Rodriguez EM, Altman NL, Lowes BD, Gilbert EM, Buttrick PM, Kao DP, Bristow MR. Sequential analysis of myocardial gene expression with phenotypic change: Use of cross-platform concordance to strengthen biologic relevance. PLoS One 2019; 14:e0221519. [PMID: 31469842 PMCID: PMC6716635 DOI: 10.1371/journal.pone.0221519] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 08/08/2019] [Indexed: 12/13/2022] Open
Abstract
Objectives To investigate the biologic relevance of cross-platform concordant changes in gene expression in intact human failing/hypertrophied ventricular myocardium undergoing reverse remodeling. Background Information is lacking on genes and networks involved in remodeled human LVs, and in the associated investigative best practices. Methods We measured mRNA expression in ventricular septal endomyocardial biopsies from 47 idiopathic dilated cardiomyopathy patients, at baseline and after 3–12 months of β-blocker treatment to effect left ventricular (LV) reverse remodeling as measured by ejection fraction (LVEF). Cross-platform gene expression change concordance was investigated in reverse remodeling Responders (R) and Nonresponders (NR) using 3 platforms (RT-qPCR, microarray, and RNA-Seq) and two cohorts (All 47 subjects (A-S) and a 12 patient “Super-Responder” (S-R) subset of A-S). Results For 50 prespecified candidate genes, in A-S mRNA expression 2 platform concordance (CcpT), but not single platform change, was directly related to reverse remodeling, indicating CcpT has biologic significance. Candidate genes yielded a CcpT (PCR/microarray) of 62% for Responder vs. Nonresponder (R/NR) change from baseline analysis in A-S, and ranged from 38% to 100% in S-R for PCR/microarray/RNA-Seq 2 platform comparisons. Global gene CcpT measured by microarray/RNA-Seq was less than for candidate genes, in S-R R/NR 17.5% vs. 38% (P = 0.036). For S-R global gene expression changes, both cross-cohort concordance (CccT) and CcpT yielded markedly greater values for an R/NR vs. an R-only analysis (by 22 fold for CccT and 7 fold for CcpT). Pathway analysis of concordant global changes for R/NR in S-R revealed signals for downregulation of multiple phosphoinositide canonical pathways, plus expected evidence of a β1-adrenergic receptor gene network including enhanced Ca2+ signaling. Conclusions Two-platform concordant change in candidate gene expression is associated with LV biologic effects, and global expression concordant changes are best identified in an R/NR design that can yield novel information.
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Affiliation(s)
- Lee S Toni
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America
| | - Ian A Carroll
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America.,ARCA biopharma, Westminster, Colorado, United States of America
| | - Kenneth L Jones
- Department of Pediatrics, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America
| | - Jessica A Schwisow
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America
| | - Wayne A Minobe
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America.,University of Colorado Cardiovascular Institute Pharmacogenomics, Boulder and Aurora, Colorado, United States of America
| | - Erin M Rodriguez
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America
| | - Natasha L Altman
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America.,University of Colorado Cardiovascular Institute Pharmacogenomics, Boulder and Aurora, Colorado, United States of America
| | - Brian D Lowes
- Division of Cardiology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Edward M Gilbert
- Division of Cardiology, University of Utah Medical Center, Salt Lake City, Utah, United States of America
| | - Peter M Buttrick
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America.,University of Colorado Cardiovascular Institute Pharmacogenomics, Boulder and Aurora, Colorado, United States of America
| | - David P Kao
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America.,University of Colorado Cardiovascular Institute Pharmacogenomics, Boulder and Aurora, Colorado, United States of America
| | - Michael R Bristow
- Division of Cardiology, University of Colorado, Denver/Anschutz Medical Campus, Aurora, Colorado, United States of America.,ARCA biopharma, Westminster, Colorado, United States of America.,University of Colorado Cardiovascular Institute Pharmacogenomics, Boulder and Aurora, Colorado, United States of America
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Mutlu M, Saatci Ö, Ansari SA, Yurdusev E, Shehwana H, Konu Ö, Raza U, Şahin Ö. miR-564 acts as a dual inhibitor of PI3K and MAPK signaling networks and inhibits proliferation and invasion in breast cancer. Sci Rep 2016; 6:32541. [PMID: 27600857 PMCID: PMC5013276 DOI: 10.1038/srep32541] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/11/2016] [Indexed: 12/19/2022] Open
Abstract
Dysregulation of PI3K and MAPK pathways promotes uncontrolled cell proliferation, apoptotic inhibition and metastasis. Individual targeting of these pathways using kinase inhibitors has largely been insufficient due to the existence of cross-talks between these parallel cascades. MicroRNAs are small non-coding RNAs targeting several genes simultaneously and controlling cancer-related processes. To identify miRNAs repressing both PI3K and MAPK pathways in breast cancer, we re-analyzed our previous miRNA mimic screen data with reverse phase protein array (RPPA) output, and identified miR-564 inhibiting both PI3K and MAPK pathways causing markedly decreased cell proliferation through G1 arrest. Moreover, ectopic expression of miR-564 blocks epithelial-mesenchymal transition (EMT) and reduces migration and invasion of aggressive breast cancer cells. Mechanistically, miR-564 directly targets a network of genes comprising AKT2, GNA12, GYS1 and SRF, thereby facilitating simultaneous repression of PI3K and MAPK pathways. Notably, combinatorial knockdown of these target genes using a cocktail of siRNAs mimics the phenotypes exerted upon miR-564 expression. Importantly, high miR-564 expression or low expression of target genes in combination is significantly correlated with better distant relapse-free survival of patients. Overall, miR-564 is a potential dual inhibitor of PI3K and MAPK pathways, and may be an attractive target and prognostic marker for breast cancer.
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Affiliation(s)
- Merve Mutlu
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Özge Saatci
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Suhail A Ansari
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Emre Yurdusev
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Huma Shehwana
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Özlen Konu
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Umar Raza
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
| | - Özgür Şahin
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800 Ankara, Turkey
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Sassmann A, Gier B, Gröne HJ, Drews G, Offermanns S, Wettschureck N. The Gq/G11-mediated signaling pathway is critical for autocrine potentiation of insulin secretion in mice. J Clin Invest 2010; 120:2184-93. [PMID: 20440069 DOI: 10.1172/jci41541] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Accepted: 03/03/2010] [Indexed: 11/17/2022] Open
Abstract
A variety of neurotransmitters, gastrointestinal hormones, and metabolic signals are known to potentiate insulin secretion through GPCRs. We show here that beta cell-specific inactivation of the genes encoding the G protein alpha-subunits Galphaq and Galpha11 resulted in impaired glucose tolerance and insulin secretion in mice. Interestingly, the defects observed in Galphaq/Galpha11-deficient beta cells were not restricted to loss of muscarinic or metabolic potentiation of insulin release; the response to glucose per se was also diminished. Electrophysiological recordings revealed that glucose-induced depolarization of isolated beta cells was impaired in the absence of Galphaq/Galpha11, and closure of KATP channels was inhibited. We provide evidence that this reduced excitability was due to a loss of beta cell-autonomous potentiation of insulin secretion through factors cosecreted with insulin. We identified as autocrine mediators involved in this process extracellular nucleotides such as uridine diphosphate acting through the Gq/G11-coupled P2Y6 receptor and extracellular calcium acting through the calcium-sensing receptor. Thus, the Gq/G11-mediated signaling pathway potentiates insulin secretion in response to glucose by integrating systemic as well as autocrine/paracrine mediators.
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Affiliation(s)
- Antonia Sassmann
- Department of Pharmacology, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany
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Koitabashi N, Aiba T, Hesketh GG, Rowell J, Zhang M, Takimoto E, Tomaselli GF, Kass DA. Cyclic GMP/PKG-dependent inhibition of TRPC6 channel activity and expression negatively regulates cardiomyocyte NFAT activation Novel mechanism of cardiac stress modulation by PDE5 inhibition. J Mol Cell Cardiol 2009; 48:713-24. [PMID: 19961855 DOI: 10.1016/j.yjmcc.2009.11.015] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Revised: 10/28/2009] [Accepted: 11/19/2009] [Indexed: 12/15/2022]
Abstract
Increased cyclic GMP from enhanced synthesis or suppressed catabolism (e.g. PDE5 inhibition by sildenafil, SIL) activates protein kinase G (PKG) and blunts cardiac pathological hypertrophy. Suppressed calcineurin (Cn)-NFAT (nuclear factor of activated T-cells) signaling appears to be involved, though it remains unclear how this is achieved. One potential mechanism involves activation of Cn/NFAT by calcium entering via transient receptor potential canonical (TRPC) channels (notably TRPC6). Here, we tested the hypothesis that PKG blocks Cn/NFAT activation by modifying and thus inhibiting TRPC6 current to break the positive feedback loop involving NFAT and NFAT-dependent TRPC6 upregulation. TRPC6 expression rose with pressure-overload in vivo, and angiotensin (ATII) or endothelin (ET1) stimulation in neonatal and adult cardiomyocytes in vitro. 8Br-cGMP and SIL reduced ET1-stimulated TRPC6 expression and NFAT dephosphorylation (activity). TRPC6 upregulation was absent if its promoter was mutated with non-functional NFAT binding sites, whereas constitutively active NFAT triggered TRPC6 expression that was not inhibited by SIL. PKG phosphorylated TRPC6, and both T70 and S322 were targeted. Both sites were functionally relevant, as 8Br-cGMP strongly suppressed current in wild-type TRPC6 channels, but not in those with phospho-silencing mutations (T70A, S322A or S322Q). NFAT activation and increased protein synthesis stimulated by ATII or ET1 was blocked by 8Br-cGMP or SIL. However, transfection with T70A or S322Q TRPC6 mutants blocked this inhibitory effect, whereas phospho-mimetic mutants (T70E, S322E, and both combined) suppressed NFAT activation. Thus PDE5-inhibition blocks TRPC6 channel activation and associated Cn/NFAT activation signaling by PKG-dependent channel phosphorylation.
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Affiliation(s)
- Norimichi Koitabashi
- Division of Cardiology, Ross 858, Department of Medicine, Johns Hopkins University Medical Institutions, 720 Rutland Avenue, Baltimore, MD 21205, USA
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