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Tirronen A, Downes NL, Huusko J, Laakkonen JP, Tuomainen T, Tavi P, Hedman M, Ylä-Herttuala S. The Ablation of VEGFR-1 Signaling Promotes Pressure Overload-Induced Cardiac Dysfunction and Sudden Death. Biomolecules 2021; 11:452. [PMID: 33802976 PMCID: PMC8002705 DOI: 10.3390/biom11030452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 03/15/2021] [Indexed: 12/28/2022] Open
Abstract
Molecular mechanisms involved in cardiac remodelling are not fully understood. To study the role of vascular endothelial growth factor receptor 1 (VEGFR-1) signaling in left ventricular hypertrophy (LVH) and heart failure, we used a mouse model lacking the intracellular VEGFR-1 tyrosine kinase domain (VEGFR-1 TK-/-) and induced pressure overload with angiotensin II infusion. Using echocardiography (ECG) and immunohistochemistry, we evaluated pathological changes in the heart during pressure overload and measured the corresponding alterations in expression level and phosphorylation of interesting targets by deep RNA sequencing and Western blot, respectively. By day 6 of pressure overload, control mice developed significant LVH whereas VEGFR-1 TK-/- mice displayed a complete absence of LVH, which correlated with significantly increased mortality. At a later time point, the cardiac dysfunction led to increased ANP and BNP levels, atrial dilatation and prolongation of the QRSp duration as well as increased cardiomyocyte area. Immunohistochemical analyses showed no alterations in fibrosis or angiogenesis in VEGFR-1 TK-/- mice. Mechanistically, the ablation of VEGFR-1 signaling led to significantly upregulated mTOR and downregulated PKCα phosphorylation in the myocardium. Our results show that VEGFR-1 signaling regulates the early cardiac remodelling during the compensatory phase of pressure overload and increases the risk of sudden death.
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Affiliation(s)
- Annakaisa Tirronen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
| | - Nicholas L. Downes
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
| | - Jenni Huusko
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
| | - Johanna P. Laakkonen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
| | - Tomi Tuomainen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
| | - Pasi Tavi
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
| | - Marja Hedman
- Institute of Clinical Medicine, University of Eastern Finland, 70029 Kuopio, Finland;
- Heart Center and Cardiothoracic Surgery, Kuopio University Hospital, 70029 Kuopio, Finland
| | - Seppo Ylä-Herttuala
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (A.T.); (N.L.D.); (J.H.); (J.P.L.); (T.T.); (P.T.)
- Heart Center and Gene Therapy Unit, Kuopio University Hospital, 70029 Kuopio, Finland
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2
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Godsman N, Kohlhaas M, Nickel A, Cheyne L, Mingarelli M, Schweiger L, Hepburn C, Munts C, Welch A, Delibegovic M, Van Bilsen M, Maack C, Dawson DK. Metabolic alterations in a rat model of Takotsubo syndrome. Cardiovasc Res 2021; 118:1932-1946. [PMID: 33711093 PMCID: PMC9239582 DOI: 10.1093/cvr/cvab081] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 03/09/2021] [Indexed: 12/16/2022] Open
Abstract
AIMS Cardiac energetic impairment is a major finding in takotsubo patients. We investigate specific metabolic adaptations to direct future therapies. METHODS AND RESULTS An isoprenaline-injection female rat model (versus sham) was studied at day-3; recovery assessed at day-7. Substrate uptake, metabolism, inflammation and remodelling were investigated by 18F-FDG-PET, metabolomics, qPCR and WB. Isolated cardiomyocytes were patch-clamped during stress protocols for redox states of NAD(P)H/FAD or [Ca2+]c, [Ca2+]m and sarcomere length. Mitochondrial respiration was assessed by seahorse/Clark electrode (glycolytic and β-oxidation substrates).Cardiac 18F-FDG metabolic rate was increased in takotsubo (p = 0.006), as were expression of GLUT4-RNA/GLUT1/HK2-RNA and HK activity (all p < 0.05), with concomitant accumulation of glucose- and fructose-6-phosphates (p > 0.0001). Both lactate and pyruvate were lower (p < 0.05) despite increases in LDH-RNA and PDH (p < 0.05 both). β-oxidation enzymes CPT1b-RNA and 3KAT were increased (p < 0.01) but malonyl-CoA (CPT-1 regulator) was upregulated (p = 0.01) with decreased fatty acids and acyl-carnitines levels (p = 0.0001-0.02). Krebs cycle intermediates α-ketoglutarate and succinyl-carnitine were reduced (p < 0.05) as was cellular ATP reporter dihydroorotate (p = 0.003). Mitochondrial Ca2+ uptake during high workload was impaired on day-3 (p < 0.0001), inducing oxidation of NAD(P)H and FAD (p = 0.03) but resolved by day-7. There were no differences in mitochondrial respiratory function, sarcomere shortening or [Ca2+] transients of isolated cardiomyocytes, implying preserved integrity of both mitochondria and cardiomyocyte. Inflammation and remodelling were upregulated - increased CD68-RNA, collagen RNA/protein and skeletal actin RNA (all p < 0.05). CONCLUSION Dys-regulation of glucose and lipid metabolic pathways with decreases in final glycolytic and β-oxidation metabolites and reduced availability of Krebs intermediates characterises takotsubo myocardium. The energetic deficit accompanies defective Ca2+ handling, inflammation and upregulation of remodelling pathways, with preservation of sarcomeric and mitochondrial integrity. TRANSLATIONAL PERSPECTIVE The simultaneous dysregulation in the glycolytic and beta-oxidation pathways which underlies the energetic deficit of the takotsubo heart supports further testing of currently available metabolic modulators as possible candidates for successful therapy, as well as targeting the inflammatory and remodelling pathways.
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Affiliation(s)
- Nadine Godsman
- Aberdeen Cardiovascular and Diabetes Centre, University of Aberdeen, Aberdeen, United Kingdom
| | | | | | - Lesley Cheyne
- Aberdeen Cardiovascular and Diabetes Centre, University of Aberdeen, Aberdeen, United Kingdom
| | - Marco Mingarelli
- Biomedical physics, University of Aberdeen, Aberdeen, United Kingdom
| | - Lutz Schweiger
- John Mallard Scottish P.E.T. Centre, University of Aberdeen, Aberdeen, United Kingdom
| | - Claire Hepburn
- Aberdeen Cardiovascular and Diabetes Centre, University of Aberdeen, Aberdeen, United Kingdom
| | - Chantal Munts
- School for Cardiovascular Diseases, Faculty of Health, Medicine and Life Sciences Maastricht University, Netherlands
| | - Andy Welch
- Biomedical physics, University of Aberdeen, Aberdeen, United Kingdom
| | - Mirela Delibegovic
- Aberdeen Cardiovascular and Diabetes Centre, University of Aberdeen, Aberdeen, United Kingdom
| | - Marc Van Bilsen
- School for Cardiovascular Diseases, Faculty of Health, Medicine and Life Sciences Maastricht University, Netherlands
| | - Christoph Maack
- Comprehensive Heart Failure Center (CHFC), Würzburg, Germany
| | - Dana K Dawson
- Aberdeen Cardiovascular and Diabetes Centre, University of Aberdeen, Aberdeen, United Kingdom
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3
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Magaye RR, Savira F, Hua Y, Xiong X, Huang L, Reid C, Flynn B, Kaye D, Liew D, Wang BH. Exogenous dihydrosphingosine 1 phosphate mediates collagen synthesis in cardiac fibroblasts through JAK/STAT signalling and regulation of TIMP1. Cell Signal 2020; 72:109629. [PMID: 32278008 DOI: 10.1016/j.cellsig.2020.109629] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 03/30/2020] [Accepted: 04/01/2020] [Indexed: 02/03/2023]
Abstract
Cardiac fibrosis and myocyte hypertrophy are hallmarks of the cardiac remodelling process in cardiomyopathies such as heart failure (HF). Dyslipidemia or dysregulation of lipids contribute to HF. The dysregulation of high density lipoproteins (HDL) could lead to altered levels of other lipid metabolites that are bound to it such as sphingosine-1- phosphate (S1P). Recently, it has been shown that S1P and its analogue dihydrosphingosine-1-phosphate (dhS1P) are bound to HDL in plasma. The effects of dhS1P on cardiac cells have been obscure. In this study, we show that extracellular dhS1P is able to increase collagen synthesis in neonatal rat cardiac fibroblasts (NCFs) and cause hypertrophy of neonatal cardiac myocytes (NCMs). The janus kinase/signal transducer and activator (JAK/STAT) signalling pathway was involved in the increased collagen synthesis by dhS1P, through sustained increase of tissue inhibitor of matrix metalloproteinase 1 (TIMP1). Extracellular dhS1P increased phosphorylation levels of STAT1 and STAT3 proteins, also caused an early increase in gene expression of transforming growth factor-β (TGFβ), and sustained increase in TIMP1. Inhibition of JAKs led to inhibition of TIMP1 and TGFβ gene and protein expression. We also show that dhS1P is able to cause NCM hypertrophy through S1P-receptor-1 (S1PR1) signalling which is opposite to that of its analogue, S1P. Taken together, our results show that dhS1P increases collagen synthesis in cardiac fibroblasts causing fibrosis through dhS1P-JAK/STAT-TIMP1 signalling.
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Affiliation(s)
- Ruth R Magaye
- Biomarker Discovery Laboratory, Baker Heart and Diabetes Institute, Melbourne, Australia; Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia
| | - Feby Savira
- Biomarker Discovery Laboratory, Baker Heart and Diabetes Institute, Melbourne, Australia; Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia
| | - Yue Hua
- Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia; School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, China
| | - Xin Xiong
- Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia; Shanghai Institute of Heart Failure, Research Centre for Translational Medicine, Shanghai East Hospital, Tongji University, School of Medicine, Shanghai 200120, China
| | - Li Huang
- Biomarker Discovery Laboratory, Baker Heart and Diabetes Institute, Melbourne, Australia; Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia
| | - Christopher Reid
- Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia; School of Public Health School, Curtin University, Perth, Australia
| | - Bernard Flynn
- Australian Translational Medicinal Chemistry Facility, Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, Australia
| | - David Kaye
- Heart Failure Research Group, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Danny Liew
- Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia
| | - Bing H Wang
- Biomarker Discovery Laboratory, Baker Heart and Diabetes Institute, Melbourne, Australia; Monash Centre of Cardiovascular Research and Education in therapeutics, Melbourne, Australia.
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4
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Rossi S, Savi M, Mazzola M, Pinelli S, Alinovi R, Gennaccaro L, Pagliaro A, Meraviglia V, Galetti M, Lozano-Garcia O, Rossini A, Frati C, Falco A, Quaini F, Bocchi L, Stilli D, Lucas S, Goldoni M, Macchi E, Mutti A, Miragoli M. Subchronic exposure to titanium dioxide nanoparticles modifies cardiac structure and performance in spontaneously hypertensive rats. Part Fibre Toxicol 2019; 16:25. [PMID: 31234877 PMCID: PMC6591966 DOI: 10.1186/s12989-019-0311-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 06/06/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Non-communicable diseases, intended as the results of a combination of inherited, environmental and biological factors, kill 40 million people each year, equivalent to roughly 70% of all premature deaths globally. The possibility that manufactured nanoparticles (NPs) may affect cardiac performance, has led to recognize NPs-exposure not only as a major Public Health concern, but also as an occupational hazard. In volunteers, NPs-exposure is problematic to quantify. We recently found that inhaled titanium dioxide NPs, one of the most produced engineered nanomaterials, acutely increased cardiac excitability and promoted arrhythmogenesis in normotensive rats by a direct interaction with cardiac cells. We hypothesized that such scenario can be exacerbated by latent cardiovascular disorders such as hypertension. RESULTS We monitored cardiac electromechanical performance in spontaneously hypertensive rats (SHRs) exposed to titanium dioxide NPs for 6 weeks using a combination of cardiac functional measurements associated with toxicological, immunological, physical and genetic assays. Longitudinal radio-telemetry ECG recordings and multiple-lead epicardial potential mapping revealed that atrial activation times significantly increased as well as proneness to arrhythmia. At the third week of nanoparticles administration, the lung and cardiac tissue encountered a maladaptive irreversible structural remodelling starting with increased pro-inflammatory cytokines levels and lipid peroxidation, resulting in upregulation of the main pro-fibrotic cardiac genes. At the end of the exposure, the majority of spontaneous arrhythmic events terminated, while cardiac hemodynamic deteriorated and a significant accumulation of fibrotic tissue occurred as compared to control untreated SHRs. Titanium dioxide nanoparticles were quantified in the heart tissue although without definite accumulation as revealed by particle-induced X-ray emission and ultrastructural analysis. CONCLUSIONS The co-morbidity of hypertension and inhaled nanoparticles induces irreversible hemodynamic impairment associated with cardiac structural damage potentially leading to heart failure. The time-dependence of exposure indicates a non-return point that needs to be taken into account in hypertensive subjects daily exposed to nanoparticles.
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Affiliation(s)
- Stefano Rossi
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy
| | - Monia Savi
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Marta Mazzola
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Silvana Pinelli
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy
| | - Rossella Alinovi
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy
| | - Laura Gennaccaro
- Institute for Biomedicine, Eurac Research, Bolzano, Italy.,Affiliated Institute of the University of Lübeck, Lübeck, Germany.,Present address: Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126, Bologna, Italy
| | - Alessandra Pagliaro
- Institute for Biomedicine, Eurac Research, Bolzano, Italy.,Affiliated Institute of the University of Lübeck, Lübeck, Germany
| | - Viviana Meraviglia
- Institute for Biomedicine, Eurac Research, Bolzano, Italy.,Affiliated Institute of the University of Lübeck, Lübeck, Germany
| | - Maricla Galetti
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy
| | - Omar Lozano-Garcia
- Namur Nanosafety Centre (NNC), Namur Research Institute for Life Sciences (NARILIS), Research Centre for the Physics of Matter and Radiation (PMR), University of Namur, B-5000, Namur, Belgium.,Present address: Cátedra de Cardiología y Medicina Vascular, Escuela de Medicina y Ciencias de la Salud Tecnologico de Monterrey, Monterrey, Mexico
| | - Alessandra Rossini
- Institute for Biomedicine, Eurac Research, Bolzano, Italy.,Affiliated Institute of the University of Lübeck, Lübeck, Germany
| | - Caterina Frati
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy
| | - Angela Falco
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy
| | - Federico Quaini
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy
| | - Leonardo Bocchi
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Donatella Stilli
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Stéphane Lucas
- Namur Nanosafety Centre (NNC), Namur Research Institute for Life Sciences (NARILIS), Research Centre for the Physics of Matter and Radiation (PMR), University of Namur, B-5000, Namur, Belgium
| | - Matteo Goldoni
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy
| | - Emilio Macchi
- CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy.,Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Antonio Mutti
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy.,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy.,Azienda Ospedaliera-Universitaria, Unità di Medicina del lavoro e Tossicologia industriale, Parma, Italy
| | - Michele Miragoli
- Department of Medicine and Surgery, University of Parma, Via Gramsci, n° 14, 43126, Parma, Italy. .,CERT, Center of Excellence for Toxicological Research, INAIL, ex-ISPESL, University of Parma, Parma, Italy. .,Humanitas Clinical and Research Center, Rozzano, Milan, Italy.
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5
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Kant S, Freytag B, Herzog A, Reich A, Merkel R, Hoffmann B, Krusche CA, Leube RE. Desmoglein 2 mutation provokes skeletal muscle actin expression and accumulation at intercalated discs in murine hearts. J Cell Sci 2019; 132:jcs.199612. [PMID: 30659114 DOI: 10.1242/jcs.199612] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 12/30/2018] [Indexed: 01/05/2023] Open
Abstract
Arrhythmogenic cardiomyopathy (AC) is an incurable progressive disease that is linked to mutations in genes coding for components of desmosomal adhesions that are localized to the intercalated disc region, which electromechanically couples adjacent cardiomyocytes. To date, the underlying molecular dysfunctions are not well characterized. In two murine AC models, we find an upregulation of the skeletal muscle actin gene (Acta1), which is known to be a compensatory reaction to compromised heart function. Expression of this gene is elevated prior to visible morphological alterations and clinical symptoms, and persists throughout pathogenesis with an additional major rise during the chronic disease stage. We provide evidence that the increased Acta1 transcription is initiated through nuclear activation of the serum response transcription factor (SRF) by its transcriptional co-activator megakaryoblastic leukemia 1 protein (MKL1, also known as MRTFA). Our data further suggest that perturbed desmosomal adhesion causes Acta1 overexpression during the early stages of the disease, which is amplified by transforming growth factor β (TGFβ) release from fibrotic lesions and surrounding cardiomyocytes during later disease stages. These observations highlight a hitherto unknown molecular AC pathomechanism.
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Affiliation(s)
- Sebastian Kant
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, 52074 Aachen, Germany
| | - Benjamin Freytag
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, 52074 Aachen, Germany
| | - Antonia Herzog
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, 52074 Aachen, Germany
| | - Anna Reich
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, 52074 Aachen, Germany
| | - Rudolf Merkel
- Forschungszentrum Jülich, Institute of Complex Systems, ICS-7, Biomechanics, 52428 Jülich, Germany
| | - Bernd Hoffmann
- Forschungszentrum Jülich, Institute of Complex Systems, ICS-7, Biomechanics, 52428 Jülich, Germany
| | - Claudia A Krusche
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, 52074 Aachen, Germany
| | - Rudolf E Leube
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, 52074 Aachen, Germany
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6
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Yang T, Miao Y, Zhang T, Mu N, Ruan L, Duan J, Zhu Y, Zhang R. Ginsenoside Rb1 inhibits autophagy through regulation of Rho/ROCK and PI3K/mTOR pathways in a pressure-overload heart failure rat model. J Pharm Pharmacol 2018; 70:830-838. [PMID: 29574918 DOI: 10.1111/jphp.12900] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 01/27/2018] [Indexed: 11/28/2022]
Abstract
Abstract
Objective
This study was designed to explore the relationship between ginsenoside Rb1 (Grb1) and high-load heart failure (HF) in rats.
Methods
The parameters of cardiac systolic function (left ventricular posterior wall thickness (LVPWT), left ventricular internal diastolic diameter (LVID), fraction shortening (FS) and mitral valves (MVs)) of rat hearts in each group were inspected by echocardiogram. The expressions of rat myocardial contractile proteins, autophagy-related proteins and the activation of Rho/ROCK and PI3K/mTOR pathways were detected by Western blot.
Key findings
LVPWT, FS, MVs and the expression of myocardial contractile proteins α-MHC, apoptosis-related proteins Bcl-2 and signalling pathway involved proteins pAkt and mTOR were significantly reduced in the HF, HF+5 mg/kg Grb1 (HF+Grb1-5) and HF+Grb1+arachidonic acid (AA) groups with LVID, β-MHC, cell apoptosis, cell autophagy and Rho/ROCK significantly increased compared with the control group, of which the tendency was contrary to the HF+20 mg/kg Grb1 (HF+Grb1-20) group compared with the HF group (P < 0.05). In the HF+Grb1+AA group, there was no significant change in the above indexes compared with the HF group.
Conclusions
The results indicated that Grb1 can exert anti-HF function by inhibiting cardiomyocyte autophagy of rats through regulation of Rho/ROCK and PI3K/mTOR pathways.
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Affiliation(s)
- Tianrui Yang
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
- College of Pharmacy, Kunming Medical University, Kunming, Yunnan, China
| | - Yunbo Miao
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Tong Zhang
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Ninghui Mu
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Libo Ruan
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Jinlan Duan
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Ying Zhu
- Department of Geriatrics, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Rongping Zhang
- Biomedical Engineering Research Center, Kunming Medical University, Kunming, Yunnan, China
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7
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Prado FP, dos Santos DO, Blefari V, Silva CA, Machado J, Kettelhut IDC, Ramos SG, Baruffi MD, Salgado HC, Prado CM. Early dystrophin loss is coincident with the transition of compensated cardiac hypertrophy to heart failure. PLoS One 2017; 12:e0189469. [PMID: 29267303 PMCID: PMC5739420 DOI: 10.1371/journal.pone.0189469] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 11/28/2017] [Indexed: 12/13/2022] Open
Abstract
Hypertension causes cardiac hypertrophy, one of the most important risk factors for heart failure (HF). Despite the importance of cardiac hypertrophy as a risk factor for the development of HF, not all hypertrophied hearts will ultimately fail. Alterations of cytoskeletal and sarcolemma-associated proteins are considered markers cardiac remodeling during HF. Dystrophin provides mechanical stability to the plasma membrane through its interactions with the actin cytoskeleton and, indirectly, to extracellular matrix proteins. This study was undertaken to evaluate dystrophin and calpain-1 in the transition from compensated cardiac hypertrophy to HF. Wistar rats were subjected to abdominal aorta constriction and killed at 30, 60 and 90 days post surgery (dps). Cardiac function and blood pressure were evaluated. The hearts were collected and Western blotting and immunofluorescence performed for dystrophin, calpain-1, alpha-fodrin and calpastatin. Statistical analyses were performed and considered significant when p<0.05. After 90 dps, 70% of the animals showed hypertrophic hearts (HH) and 30% hypertrophic+dilated hearts (HD). Systolic and diastolic functions were preserved at 30 and 60 dps, however, decreased in the HD group. Blood pressure, cardiomyocyte diameter and collagen content were increased at all time points. Dystrophin expression was lightly increased at 30 and 60 dps and HH group. HD group showed decreased expression of dystrophin and calpastatin and increased expression of calpain-1 and alpha-fodrin fragments. The first signals of dystrophin reduction were observed as early as 60 dps. In conclusion, some hearts present a distinct molecular pattern at an early stage of the disease; this pattern could provide an opportunity to identify these failure-prone hearts during the development of the cardiac disease. We showed that decreased expression of dystrophin and increased expression of calpains are coincident and could work as possible therapeutic targets to prevent heart failure as a consequence of cardiac hypertrophy.
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Affiliation(s)
- Fernanda P. Prado
- Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Daniele O. dos Santos
- Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Valdecir Blefari
- Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Carlos A. Silva
- Department of Phisiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Juliano Machado
- Department of Biochemistry/Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Isis do Carmo Kettelhut
- Department of Biochemistry/Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Simone G. Ramos
- Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Marcelo Dias Baruffi
- Department of Clinical Analysis, Toxicology and Food Science, Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Helio C. Salgado
- Department of Phisiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Cibele M. Prado
- Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
- * E-mail:
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8
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Vela-Guajardo JE, Pérez-Treviño P, Rivera-Álvarez I, González-Mondellini FA, Altamirano J, García N. The 8-oxo-deoxyguanosine glycosylase increases its migration to mitochondria in compensated cardiac hypertrophy. ACTA ACUST UNITED AC 2017; 11:660-672. [PMID: 28882450 DOI: 10.1016/j.jash.2017.08.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/30/2017] [Accepted: 08/15/2017] [Indexed: 11/19/2022]
Abstract
Cardiac hypertrophy is a compensatory mechanism maladapted because it presents an increase in the oxidative stress which could be associated with the development of the heart failure. A mechanism proposed is by mitochondrial DNA (mtDNA) oxidation, which evolved to a vicious cycle because of the synthesis of proteins encoded in the genome is committed. Therefore, the aim of the present work was to evaluate the mtDNA damage and enzyme repairing the 8-oxo-deoxyguanosine glycosylase mitochondrial isoform 1-2a (OGG1-2a) in the early stage of compensated cardiac hypertrophy induced by abdominal aortic constriction (AAC). Results showed that after 6 weeks of AAC, hearts presented a compensated hypertrophy (22%), with an increase in the cell volume (35%), mitochondrial mass (12%), and mitochondrial membrane potential (94%). However, the increase of oxidative stress did not affect mtDNA most probably because OGG1-2a was found to increase 3.2 times in the mitochondrial fraction. Besides, mitochondrial function was not altered by the cardiac hypertrophy condition but in vitro mitochondria from AAC heart showed an increased sensibility to stress induced by the high Ca2+ concentration. The increase in the oxidative stress in compensated cardiac hypertrophy induced the OGG1-2a migration to mitochondria to repair mtDNA oxidation, as a mechanism that allows maintaining the cardiac function in the compensatory stage.
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Affiliation(s)
- Jorge E Vela-Guajardo
- Medicina Cardiovascular y Metabolómica, Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, San Pedro Garza García, Nuevo León, México
| | - Perla Pérez-Treviño
- Medicina Cardiovascular y Metabolómica, Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, San Pedro Garza García, Nuevo León, México
| | - Irais Rivera-Álvarez
- Medicina Cardiovascular y Metabolómica, Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, San Pedro Garza García, Nuevo León, México
| | - Fabio A González-Mondellini
- Medicina Cardiovascular y Metabolómica, Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, San Pedro Garza García, Nuevo León, México
| | - Julio Altamirano
- Medicina Cardiovascular y Metabolómica, Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, San Pedro Garza García, Nuevo León, México
| | - Noemí García
- Medicina Cardiovascular y Metabolómica, Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, San Pedro Garza García, Nuevo León, México.
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9
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Savi M, Bocchi L, Rossi S, Frati C, Graiani G, Lagrasta C, Miragoli M, Di Pasquale E, Stirparo GG, Mastrototaro G, Urbanek K, De Angelis A, Macchi E, Stilli D, Quaini F, Musso E. Antiarrhythmic effect of growth factor-supplemented cardiac progenitor cells in chronic infarcted heart. Am J Physiol Heart Circ Physiol 2016; 310:H1622-48. [PMID: 26993221 DOI: 10.1152/ajpheart.00035.2015] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 03/10/2016] [Indexed: 12/12/2022]
Abstract
c-Kit(pos) cardiac progenitor cells (CPCs) represent a successful approach in healing the infarcted heart and rescuing its mechanical function, but electrophysiological consequences are uncertain. CPC mobilization promoted by hepatocyte growth factor (HGF) and IGF-1 improved electrogenesis in myocardial infarction (MI). We hypothesized that locally delivered CPCs supplemented with HGF + IGF-1 (GFs) can concur in ameliorating electrical stability of the regenerated heart. Adult male Wistar rats (139 rats) with 4-wk-old MI or sham conditions were randomized to receive intramyocardial injection of GFs, CPCs, CPCs + GFs, or vehicle (V). Enhanced green fluorescent protein-tagged CPCs were used for cell tracking. Vulnerability to stress-induced arrhythmia was assessed by telemetry-ECG. Basic cardiac electrophysiological properties were examined by epicardial multiple-lead recording. Hemodynamic function was measured invasively. Hearts were subjected to anatomical, morphometric, immunohistochemical, and molecular biology analyses. Compared with V and at variance with individual CPCs, CPCs + GFs approximately halved arrhythmias in all animals, restoring cardiac anisotropy toward sham values. GFs alone reduced arrhythmias by less than CPCs + GFs, prolonging ventricular refractoriness without affecting conduction velocity. Concomitantly, CPCs + GFs reactivated the expression levels of Connexin-43 and Connexin-40 as well as channel proteins of key depolarizing and repolarizing ion currents differently than sole GFs. Mechanical function and anatomical remodeling were equally improved by all regenerative treatments, thus exhibiting a divergent behavior relative to electrical aspects. Conclusively, we provided evidence of distinctive antiarrhythmic action of locally injected GF-supplemented CPCs, likely attributable to retrieval of Connexin-43, Connexin-40, and Cav1.2 expression, favoring intercellular coupling and spread of excitation in mended heart.
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Affiliation(s)
- Monia Savi
- Department of Life Sciences, University of Parma, Italy
| | | | - Stefano Rossi
- Department of Life Sciences, University of Parma, Italy
| | - Caterina Frati
- Department of Biomedical, Biotechnological and Translational Sciences, University of Parma, Italy
| | - Gallia Graiani
- Department of Biomedical, Biotechnological and Translational Sciences, University of Parma, Italy
| | - Costanza Lagrasta
- Department of Biomedical, Biotechnological and Translational Sciences, University of Parma, Italy; Cardiac Stem Cell Interdepartmental Center "CISTAC," University of Parma, Italy
| | | | - Elisa Di Pasquale
- Humanitas Clinical and Research Center, Rozzano (MI), Italy; Institute of Genetic and Biomedical Research-UOS Milan-National Research Council, Milan, Italy
| | | | | | - Konrad Urbanek
- Department of Experimental Medicine, Section of Pharmacology, Second University of Naples, Italy
| | - Antonella De Angelis
- Department of Experimental Medicine, Section of Pharmacology, Second University of Naples, Italy
| | - Emilio Macchi
- Department of Life Sciences, University of Parma, Italy; Cardiac Stem Cell Interdepartmental Center "CISTAC," University of Parma, Italy
| | - Donatella Stilli
- Department of Life Sciences, University of Parma, Italy; Cardiac Stem Cell Interdepartmental Center "CISTAC," University of Parma, Italy
| | - Federico Quaini
- Department of Clinical and Experimental Medicine, University of Parma, Italy; Cardiac Stem Cell Interdepartmental Center "CISTAC," University of Parma, Italy
| | - Ezio Musso
- Department of Life Sciences, University of Parma, Italy; Cardiac Stem Cell Interdepartmental Center "CISTAC," University of Parma, Italy
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10
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Chen YC, Ayaz-Guner S, Peng Y, Lane NM, Locher M, Kohmoto T, Larsson L, Moss RL, Ge Y. Effective top-down LC/MS+ method for assessing actin isoforms as a potential cardiac disease marker. Anal Chem 2015; 87:8399-8406. [PMID: 26189812 DOI: 10.1021/acs.analchem.5b01745] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Actin is the major component of the cytoskeleton, playing an essential role in the structure and motility of both muscle and nonmuscle cells. It is highly conserved and encoded by a multigene family. α-Cardiac actin (αCAA) and α-skeletal actin (αSKA), encoded by two different genes, are the primary actin isoforms expressed in striated muscles. The relative expression levels of αSKA and αCAA have been shown to vary between species and under pathological conditions. In particular, an increased αSKA expression is believed to be a programmed response of a diseased heart. Therefore, it is essential to quantify the relative expression of αSKA and αCAA, which remains challenging due to the high degree of sequence similarity between these isoforms (98.9%). Herein, we developed a top-down liquid chromatography/mass spectrometry-based ("LC/MS+") method for the rapid purification and comprehensive analysis of α-actin extracted from muscle tissues. We thoroughly investigated all of the actin isoforms in healthy human cardiac and skeletal muscles. We found that αSKA is the only isoform expressed in skeletal muscle, whereas αCAA and αSKA are coexpressed in cardiac muscle. We then applied our method to quantify the α-actin isoforms in human healthy hearts and failing hearts with dilated cardiomyopathy (DCM). We found that αSKA is augmented in DCM compared with healthy controls, 43.1 ± 0.9% versus 23.7 ± 1.7%, respectively. As demonstrated, top-down LC/MS+ provides an effective and comprehensive method for the purification, quantification, and characterization of α-actin isoforms, enabling assessment of their clinical potential as cardiac disease markers.
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Affiliation(s)
- Yi-Chen Chen
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA.,Department of Chemistry, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Serife Ayaz-Guner
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Ying Peng
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA.,Human Proteomics Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Nicole M Lane
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Matthew Locher
- Department of Surgery, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Takushi Kohmoto
- Department of Surgery, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Lars Larsson
- Department of Physiology and Pharmacology, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Richard L Moss
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA.,Human Proteomics Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Ying Ge
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA.,Department of Chemistry, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA.,Human Proteomics Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
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Temporal and Molecular Analyses of Cardiac Extracellular Matrix Remodeling following Pressure Overload in Adiponectin Deficient Mice. PLoS One 2015; 10:e0121049. [PMID: 25910275 PMCID: PMC4409146 DOI: 10.1371/journal.pone.0121049] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 02/05/2015] [Indexed: 12/16/2022] Open
Abstract
Adiponectin, circulating levels of which are reduced in obesity and diabetes, mediates cardiac extracellular matrix (ECM) remodeling in response to pressure overload (PO). Here, we performed a detailed temporal analysis of progressive cardiac ECM remodelling in adiponectin knockout (AdKO) and wild-type (WT) mice at 3 days and 1, 2, 3 and 4 weeks following the induction of mild PO via minimally invasive transverse aortic banding. We first observed that myocardial adiponectin gene expression was reduced after 4 weeks of PO, whereas increased adiponectin levels were detected in cardiac homogenates at this time despite decreased circulating levels of adiponectin. Scanning electron microscopy and Masson’s trichrome staining showed collagen accumulation increased in response to 2 and 4 weeks of PO in WT mice, while fibrosis in AdKO mice was notably absent after 2 weeks but highly apparent after 4 weeks of PO. Time and intensity of fibroblast appearance after PO was not significantly different between AdKO and WT animals. Gene array analysis indicated that MMP2, TIMP2, collagen 1α1 and collagen 1α3 were induced after 2 weeks of PO in WT but not AdKO mice. After 4 weeks MMP8 was induced in both genotypes, MMP9 only in WT mice and MMP1α only in AdKO mice. Direct stimulation of primary cardiac fibroblasts with adiponectin induced a transient increase in total collagen detected by picrosirius red staining and collagen III levels synthesis, as well as enhanced MMP2 activity detected via gelatin zymography. Adiponectin also enhanced fibroblast migration and attenuated angiotensin-II induced differentiation to a myofibroblast phenotype. In conclusion, these data indicate that increased myocardial bioavailability of adiponectin mediates ECM remodeling following PO and that adiponectin deficiency delays these effects.
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12
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Magi S, Nasti AA, Gratteri S, Castaldo P, Bompadre S, Amoroso S, Lariccia V. Gram-negative endotoxin lipopolysaccharide induces cardiac hypertrophy: Detrimental role of Na+–Ca2+ exchanger. Eur J Pharmacol 2015; 746:31-40. [DOI: 10.1016/j.ejphar.2014.10.054] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 10/22/2014] [Accepted: 10/25/2014] [Indexed: 01/18/2023]
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13
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Chung E, Leinwand LA. Pregnancy as a cardiac stress model. Cardiovasc Res 2014; 101:561-70. [PMID: 24448313 PMCID: PMC3941597 DOI: 10.1093/cvr/cvu013] [Citation(s) in RCA: 137] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 11/28/2013] [Accepted: 12/08/2013] [Indexed: 02/07/2023] Open
Abstract
Cardiac hypertrophy occurs during pregnancy as a consequence of both volume overload and hormonal changes. Both pregnancy- and exercise-induced cardiac hypertrophy are generally thought to be similar and physiological. Despite the fact that there are shared transcriptional responses in both forms of cardiac adaptation, pregnancy results in a distinct signature of gene expression in the heart. In some cases, however, pregnancy can induce adverse cardiac events in previously healthy women without any known cardiovascular disease. Peripartum cardiomyopathy is the leading cause of non-obstetric mortality during pregnancy. To understand how pregnancy can cause heart disease, it is first important to understand cardiac adaptation during normal pregnancy. This review provides an overview of the cardiac consequences of pregnancy, including haemodynamic, functional, structural, and morphological adaptations, as well as molecular phenotypes. In addition, this review describes the signalling pathways responsible for pregnancy-induced cardiac hypertrophy and angiogenesis. We also compare and contrast cardiac adaptation in response to disease, exercise, and pregnancy. The comparisons of these settings of cardiac hypertrophy provide insight into pregnancy-associated cardiac adaptation.
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Affiliation(s)
- Eunhee Chung
- Department of Health, Exercise, and Sport Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Leslie A. Leinwand
- Department of Molecular, Cellular, and Developmental Biology and BioFrontiers Institute, University of Colorado, Boulder, CO 80309, USA
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14
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Comparative proteomic analysis of hearts of adult SCNT Bama miniature pigs (Sus scrofa). Theriogenology 2014; 81:901-5. [PMID: 24560549 DOI: 10.1016/j.theriogenology.2014.01.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 01/07/2014] [Accepted: 01/07/2014] [Indexed: 01/01/2023]
Abstract
This study aims to determine the effects of SCNT on cardiac development of SCNT pigs through proteomic methods. Heart proteins from three adult SCNTs and two normal reproductive Bama miniature pigs were extracted, separated, and identified via comparative proteomic methods, including two-dimensional gel electrophoresis, mass spectrometry, and Western blot. Eleven differentially expressed spots were identified as differentially expressed proteins, of which five spots were upregulated proteins such as cardiac myosin heavy chain, cathepsin D, and heat shock protein beta-1 (HSP27). By contrast, six spots were downregulated proteins such as alpha skeletal muscle and actin. The results also demonstrated that nuclear transfer might result in abnormal expression of some important proteins in hearts from SCNT pigs, and affect the cardiac development in SCNT pigs' survival.
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15
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Distinct cardiac transcriptional profiles defining pregnancy and exercise. PLoS One 2012; 7:e42297. [PMID: 22860109 PMCID: PMC3409173 DOI: 10.1371/journal.pone.0042297] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Accepted: 07/02/2012] [Indexed: 12/11/2022] Open
Abstract
Background Although the hypertrophic responses of the heart to pregnancy and exercise are both considered to be physiological processes, they occur in quite different hormonal and temporal settings. In this study, we have compared the global transcriptional profiles of left ventricular tissues at various time points during the progression of hypertrophy in exercise and pregnancy. Methodology/Principal Findings The following groups of female mice were analyzed: non-pregnant diestrus cycle sedentary control, mid-pregnant, late-pregnant, and immediate-postpartum, and animals subjected to 7 and 21 days of voluntary wheel running. Hierarchical clustering analysis shows that while mid-pregnancy and both exercise groups share the closest relationship and similar gene ontology categories, late pregnancy and immediate post-partum are quite different with high representation of secreted/extracellular matrix-related genes. Moreover, pathway-oriented ontological analysis shows that metabolism regulated by cytochrome P450 and chemokine pathways are the most significant signaling pathways regulated in late pregnancy and immediate-postpartum, respectively. Finally, increases in expression of components of the proteasome observed in both mid-pregnancy and immediate-postpartum also result in enhanced proteasome activity. Interestingly, the gene expression profiles did not correlate with the degree of cardiac hypertrophy observed in the animal groups, suggesting that distinct pathways are employed to achieve similar amounts of cardiac hypertrophy. Conclusions/Significance Our results demonstrate that cardiac adaptation to the later stages of pregnancy is quite distinct from both mid-pregnancy and exercise. Furthermore, it is very dynamic since, by 12 hours post-partum, the heart has already initiated regression of cardiac growth, and 50 genes have changed expression significantly in the immediate-postpartum compared to late-pregnancy. Thus, pregnancy-induced cardiac hypertrophy is a more complex process than exercise-induced cardiac hypertrophy and our data suggest that the mechanisms underlying the two types of hypertrophy have limited overlap.
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16
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Hou J, Kang YJ. Regression of pathological cardiac hypertrophy: signaling pathways and therapeutic targets. Pharmacol Ther 2012; 135:337-54. [PMID: 22750195 DOI: 10.1016/j.pharmthera.2012.06.006] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Accepted: 06/12/2012] [Indexed: 02/05/2023]
Abstract
Pathological cardiac hypertrophy is a key risk factor for heart failure. It is associated with increased interstitial fibrosis, cell death and cardiac dysfunction. The progression of pathological cardiac hypertrophy has long been considered as irreversible. However, recent clinical observations and experimental studies have produced evidence showing the reversal of pathological cardiac hypertrophy. Left ventricle assist devices used in heart failure patients for bridging to transplantation not only improve peripheral circulation but also often cause reverse remodeling of the geometry and recovery of the function of the heart. Dietary supplementation with physiologically relevant levels of copper can reverse pathological cardiac hypertrophy in mice. Angiogenesis is essential and vascular endothelial growth factor (VEGF) is a constitutive factor for the regression. The action of VEGF is mediated by VEGF receptor-1, whose activation is linked to cyclic GMP-dependent protein kinase-1 (PKG-1) signaling pathways, and inhibition of cyclic GMP degradation leads to regression of pathological cardiac hypertrophy. Most of these pathways are regulated by hypoxia-inducible factor. Potential therapeutic targets for promoting the regression include: promotion of angiogenesis, selective enhancement of VEGF receptor-1 signaling pathways, stimulation of PKG-1 pathways, and sustention of hypoxia-inducible factor transcriptional activity. More exciting insights into the regression of pathological cardiac hypertrophy are emerging. The time of translating the concept of regression of pathological cardiac hypertrophy to clinical practice is coming.
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Affiliation(s)
- Jianglong Hou
- Regenerative Medicine Research Center, West China Hospital, Sichuan University, Chengdu, China
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17
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Syndecan-4 is essential for development of concentric myocardial hypertrophy via stretch-induced activation of the calcineurin-NFAT pathway. PLoS One 2011; 6:e28302. [PMID: 22164265 PMCID: PMC3229559 DOI: 10.1371/journal.pone.0028302] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Accepted: 11/05/2011] [Indexed: 12/26/2022] Open
Abstract
Sustained pressure overload leads to compensatory myocardial hypertrophy and subsequent heart failure, a leading cause of morbidity and mortality. Further unraveling of the cellular processes involved is essential for development of new treatment strategies. We have investigated the hypothesis that the transmembrane Z-disc proteoglycan syndecan-4, a co-receptor for integrins, connecting extracellular matrix proteins to the cytoskeleton, is an important signal transducer in cardiomyocytes during development of concentric myocardial hypertrophy following pressure overload. Echocardiographic, histochemical and cardiomyocyte size measurements showed that syndecan-4−/− mice did not develop concentric myocardial hypertrophy as found in wild-type mice, but rather left ventricular dilatation and dysfunction following pressure overload. Protein and gene expression analyses revealed diminished activation of the central, pro-hypertrophic calcineurin-nuclear factor of activated T-cell (NFAT) signaling pathway. Cardiomyocytes from syndecan-4−/−-NFAT-luciferase reporter mice subjected to cyclic mechanical stretch, a hypertrophic stimulus, showed minimal activation of NFAT (1.6-fold) compared to 5.8-fold increase in NFAT-luciferase control cardiomyocytes. Accordingly, overexpression of syndecan-4 or introducing a cell-permeable membrane-targeted syndecan-4 polypeptide (gain of function) activated NFATc4 in vitro. Pull-down experiments demonstrated a direct intracellular syndecan-4-calcineurin interaction. This interaction and activation of NFAT were increased by dephosphorylation of serine 179 (pS179) in syndecan-4. During pressure overload, phosphorylation of syndecan-4 was decreased, and association between syndecan-4, calcineurin and its co-activator calmodulin increased. Moreover, calcineurin dephosphorylated pS179, indicating that calcineurin regulates its own binding and activation. Finally, patients with hypertrophic myocardium due to aortic stenosis had increased syndecan-4 levels with decreased pS179 which was associated with increased NFAT activation. In conclusion, our data show that syndecan-4 is essential for compensatory hypertrophy in the pressure overloaded heart. Specifically, syndecan-4 regulates stretch-induced activation of the calcineurin-NFAT pathway in cardiomyocytes. Thus, our data suggest that manipulation of syndecan-4 may provide an option for therapeutic modulation of calcineurin-NFAT signaling.
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Castello L, Maina M, Testa G, Cavallini G, Biasi F, Donati A, Leonarduzzi G, Bergamini E, Poli G, Chiarpotto E. Alternate-day fasting reverses the age-associated hypertrophy phenotype in rat heart by influencing the ERK and PI3K signaling pathways. Mech Ageing Dev 2011; 132:305-14. [PMID: 21741396 DOI: 10.1016/j.mad.2011.06.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 06/09/2011] [Accepted: 06/15/2011] [Indexed: 11/18/2022]
Abstract
The age-related increased impedance in large arteries overloads the senescent heart, and the myocardial phenotype is hypertrophic. Together with qualitative changes observed in the senile heart, this can be responsible for impaired diastolic function. A restricted diet providing adequate nutrient intake, e.g. alternate-day fasting (ADF), has been shown to extend life-span and decrease incidence and progression of age-associated diseases in laboratory rodents, and to ameliorate some metabolic markers of aging in rhesus monkeys and humans. This study reports an age-related increase of some biological and morphological hypertrophy markers in the rat heart, together with increased plasma BNP, a well known marker of heart failure. The tissue modifications might likely be related to hyper-activation of two of the signaling pathways associated with myocardial pathological hypertrophy: ERK1/2 and PI3Kγ. Increased ERK1/2 activation might be in part related to the disturbance of STAT3, with a consequent decrease of SOCS3. In this context, the down-modulation of ERK1/2 and PI3Kγ signaling, together with the restoration of STAT3 activity and SOCS3 content, both observed with ADF, might help to reduce pathological hypertrophy stimuli and to rescue an important cardioprotective pathway, possibly opening new preventive and therapeutic perspectives in age-related heart failure.
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Affiliation(s)
- Laura Castello
- Pediatric Hospital Regina Margherita-S. Anna, Pediatric Oncohematology, Stem Cell Transplant and Cellular Therapy Centre, P.zza Polonia 94, 10126 Torino, Italy.
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19
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D'Souza A, Howarth FC, Yanni J, Dobryznski H, Boyett MR, Adeghate E, Bidasee KR, Singh J. Left ventricle structural remodelling in the prediabetic Goto-Kakizaki rat. Exp Physiol 2011; 96:875-88. [PMID: 21622965 DOI: 10.1113/expphysiol.2011.058271] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This study tested the hypothesis that experimental prediabetes can elicit structural remodelling in the left ventricle (LV). Left ventricles isolated from 8-week-old male Goto-Kakizaki (GK) rats and age-matched male Wistar control rats were used to assess remodelling changes and underlying transforming growth factor β1 (TGFβ1) activity, prohypertrophic Akt-p70S6K1 signalling and gene expression profile of the extracellular matrix (ECM) using histological, immunohistochemical, immunoblotting and quantitative gene expression analyses. Prediabetes in GK rats was confirmed by impaired glucose tolerance and modestly elevated fasting blood glucose. Left ventricle remodelling in the GK rat presented with marked hypertrophy of cardiomyocytes and increased ECM deposition that together translated into increased heart size in the absence of ultrastructural changes or fibre disarray. Molecular derangements underlying this phenotype included recapitulation of the fetal gene phenotype markers B-type natriuretic peptide and α-skeletal muscle actin, activation of the Akt-p70S6K1 pathway and altered gene expression profile of key components (collagen 1α and fibronectin) and modulators of the ECM (matrix metalloproteinases 2 and 9 and connective tissue growth factor). These changes were correlated with parallel findings of increased TGFβ1 transcription and activation in the LV and elevated active TGFβ1 in plasma of GK rats compared with control animals (Student's t test, P < 0.05 versus age-matched Wistar control animals for all parameters). This is the first report to describe LV structural remodelling in experimental prediabetes. The results suggest that ventricular decompensation pathognomonic of advanced diabetic cardiomyopathy may have possible origins in profibrotic and prohypertrophic mechanisms triggered before the onset of type 2 diabetes mellitus.
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Affiliation(s)
- Alicia D'Souza
- School of Forensic and Investigative Science, University of Central Lancashire, Preston, Lancashire PR1 2HE, UK
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Stabile AM, Aceros H, Stockmeyer K, Abdel Rahman AA, Noiseux N, Mukaddam-Daher S. Functional and molecular effects of imidazoline receptor activation in heart failure. Life Sci 2011; 88:493-503. [PMID: 21277868 DOI: 10.1016/j.lfs.2011.01.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Revised: 12/05/2010] [Accepted: 12/27/2010] [Indexed: 12/17/2022]
Abstract
AIMS Heart failure is a progressive deterioration in heart function associated with overactivity of the sympathetic nervous system. The benefit of inhibition of sympathetic activity by moxonidine, a centrally acting imidazoline receptor agonist, was questioned based on the outcome of a failing clinical trial. The following studies measured cardiac structure and hemodynamics and mechanisms underlying moxonidine-induced changes, in cardiomyopathic hamsters, where the stage of the disease, dose, and compliance were controlled. MAIN METHODS Male BIO 14.6 hamsters (6 and 10 months old, with moderate and advanced heart failure, respectively) received moxonidine at 2 concentrations: low (2.4 mg/kg/day) and high (9.6 mg/kg/day), or vehicle, subcutaneously, for 1month. Cardiac function was measured by echocardiography, plasma and hearts were collected for histological determination of fibrosis and apoptosis, as well as for measurement cytokines by Elisa and cardiac proteins by Western blotting. KEY FINDINGS Compared to age-matched vehicle-treated BIO 14.6, moxonidine did not reduce blood pressure but significantly reduced heart rate and improved cardiac performance. Moxonidine exerted anti-apoptotic effect with differential inflammatory/anti-inflammatory responses that culminate in attenuated cardiac apoptosis and fibrosis and altered protein expression of collagen types. Some effects were observed regardless of treatment onset, although the changes were more significant in the younger group. Interestingly, moxonidine resulted in upregulation of cardiac imidazoline receptors. SIGNIFICANCE These studies imply that in addition to centrally mediated sympathetic inhibition, the effects of moxonidine may, at least in part, be mediated by direct actions on the heart. Further investigation of imidazolines/imidazoline receptors in cardiovascular diseases is warranted.
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Affiliation(s)
- Angelita Maria Stabile
- Centre Hospitalier de L'Université de Montréal Research Center (CRCHUM), Montreal, QC, Canada
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Rasi K, Piuhola J, Czabanka M, Sormunen R, Ilves M, Leskinen H, Rysä J, Kerkelä R, Janmey P, Heljasvaara R, Peuhkurinen K, Vuolteenaho O, Ruskoaho H, Vajkoczy P, Pihlajaniemi T, Eklund L. Collagen XV Is Necessary for Modeling of the Extracellular Matrix and Its Deficiency Predisposes to Cardiomyopathy. Circ Res 2010; 107:1241-52. [DOI: 10.1161/circresaha.110.222133] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Rationale:
The extracellular matrix (ECM) is a major determinant of the structural integrity and functional properties of the myocardium in common pathological conditions, and changes in vasculature contribute to cardiac dysfunction. Collagen (Col) XV is preferentially expressed in the ECM of cardiac muscle and microvessels.
Objective:
We aimed to characterize the ECM, cardiovascular function and responses to elevated cardiovascular load in mice lacking Col XV (
Col15a1
−/−
) to define its functional role in the vasculature and in age- and hypertension-associated myocardial remodeling.
Methods and Results:
Cardiac structure and vasculature were analyzed by light and electron microscopy. Cardiac function, intraarterial blood pressure, microhemodynamics, and gene expression profiles were studied using echocardiography, telemetry, intravital microscopy, and PCR, respectively. Experimental hypertension was induced with angiotensin II or with a nitric oxide synthesis inhibitor. Under basal conditions, lack of Col XV resulted in increased permeability and impaired microvascular hemodynamics, distinct early-onset and age-dependent defects in heart structure and function, a poorly organized fibrillar collagen matrix with marked interstitial deposition of nonfibrillar protein aggregates, increased tissue stiffness, and irregularly organized cardiomyocytes. In response to experimental hypertension,
Col15a1
gene expression was increased in the left ventricle of wild-type mice, and mRNA expression of natriuretic peptides (ANP and BNP) and ECM modeling were abnormal in
Col15a1
−/−
mice.
Conclusions:
Col XV is necessary for ECM organization in the heart, and for the structure and functions of microvessels. Col XV deficiency leads to a complex cardiac phenotype and predisposes the subject to pathological responses under cardiac stress.
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Affiliation(s)
- Karolina Rasi
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Jarkko Piuhola
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Marcus Czabanka
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Raija Sormunen
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Mika Ilves
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Hanna Leskinen
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Jaana Rysä
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Risto Kerkelä
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Paul Janmey
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Ritva Heljasvaara
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Keijo Peuhkurinen
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Olli Vuolteenaho
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Heikki Ruskoaho
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Peter Vajkoczy
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Taina Pihlajaniemi
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
| | - Lauri Eklund
- From the Oulu Center for Cell-Matrix Research, Biocenter Oulu, and Department of Medical Biochemistry and Molecular Biology (K.R., R.H., T.P., L.E.); Biocenter Oulu and Department of Pharmacology and Toxicology (J.P., H.L., J.R., R.K., H.R.); Department of Internal Medicine, Division of Cardiology (J.P.); Biocenter Oulu and Department of Pathology (R.S.); and Department of Physiology (M.I., O.V.), University of Oulu, Finland; Department of Neurosurgery (M.C., P.V.), Charité-Universitätsmedizin
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22
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Copeland O, Nowak KJ, Laing NG, Ravenscroft G, Messer AE, Bayliss CR, Marston SB. Investigation of changes in skeletal muscle alpha-actin expression in normal and pathological human and mouse hearts. J Muscle Res Cell Motil 2010; 31:207-14. [PMID: 20706863 DOI: 10.1007/s10974-010-9224-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Accepted: 07/21/2010] [Indexed: 10/19/2022]
Abstract
We have developed a quantitative antibody-based assay to measure the content of skeletal muscle alpha-actin relative to cardiac alpha-actin. We found 21 +/- 2% skeletal muscle alpha-actin content in normal heart muscle of adult man and mouse. In end stage failing heart 53 +/- 5% of striated actin was skeletal muscle alpha-actin and in samples of inter-ventricular septum from patients with hypertrophic obstructive cardiomyopathy (HOCM) skeletal muscle alpha-actin was 72 +/- 2% of sarcomeric actin. Thin filaments containing actin isolated from normal and HOCM heart muscle were functionally indistinguishable when studied by quantitative in vitro motility assay. We also found elevated skeletal muscle alpha-actin (60 +/- 7%) in a mouse model of dilated cardiomyopathy.
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Affiliation(s)
- O'Neal Copeland
- NHLI, Cardiovascular Science, Imperial College London, London, UK
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23
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Balasubramanian S, Mani SK, Kasiganesan H, Baicu CC, Kuppuswamy D. Hypertrophic stimulation increases beta-actin dynamics in adult feline cardiomyocytes. PLoS One 2010; 5:e11470. [PMID: 20635003 PMCID: PMC2902504 DOI: 10.1371/journal.pone.0011470] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Accepted: 06/15/2010] [Indexed: 02/04/2023] Open
Abstract
The myocardium responds to hemodynamic stress through cellular growth and organ hypertrophy. The impact of cytoskeletal elements on this process, however, is not fully understood. While α-actin in cardiomyocytes governs muscle contraction in combination with the myosin motor, the exact role of β-actin has not been established. We hypothesized that in adult cardiomyocytes, as in non-myocytes, β-actin can facilitate cytoskeletal rearrangement within cytoskeletal structures such as Z-discs. Using a feline right ventricular pressure overload (RVPO) model, we measured the level and distribution of β-actin in normal and pressure overloaded myocardium. Resulting data demonstrated enriched levels of β-actin and enhanced translocation to the Triton-insoluble cytoskeletal and membrane skeletal complexes. In addition, RVPO in vivo and in vitro hypertrophic stimulation with endothelin (ET) or insulin in isolated adult cardiomyocytes enhanced the content of polymerized fraction (F-actin) of β-actin. To determine the localization and dynamics of β-actin, we adenovirally expressed GFP-tagged β-actin in isolated adult cardiomyocytes. The ectopically expressed β-actin-GFP localized to the Z-discs, costameres, and cell termini. Fluorescence recovery after photobleaching (FRAP) measurements of β-actin dynamics revealed that β-actin at the Z-discs is constantly being exchanged with β-actin from cytoplasmic pools and that this exchange is faster upon hypertrophic stimulation with ET or insulin. In addition, in electrically stimulated isolated adult cardiomyocytes, while β-actin overexpression improved cardiomyocyte contractility, immunoneutralization of β-actin resulted in a reduced contractility suggesting that β-actin could be important for the contractile function of adult cardiomyocytes. These studies demonstrate the presence and dynamics of β-actin in the adult cardiomyocyte and reinforce its usefulness in measuring cardiac cytoskeletal rearrangement during hypertrophic stimulation.
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Affiliation(s)
- Sundaravadivel Balasubramanian
- Cardiology Division, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, South Carolina, United States of America.
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24
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Deckmann AC, Theizen TH, Medrano FJ, Franchini KG, Pereira GAG. Immediate response of myocardium to pressure overload includes transient regulation of genes associated with mitochondrial bioenergetics and calcium availability. Genet Mol Biol 2010; 33:12-6. [PMID: 21637598 PMCID: PMC3036092 DOI: 10.1590/s1415-47572010005000004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Accepted: 08/17/2009] [Indexed: 12/24/2022] Open
Abstract
Ventricular hypertrophy is one of the major myocardial responses to pressure overload (PO). Most studies on early myocardial response focus on the days or even weeks after induction of hypertrophic stimuli. Since mechanotransduction pathways are immediately activated in hearts undergoing increased work load, it is reasonable to infer that the myocardial gene program may be regulated in the first few hours. In the present study, we monitored the expression of some genes previously described in the context of myocardial hypertrophic growth by using the Northern blot technique, to estimate the mRNA content of selected genes in rat myocardium for the periods 1, 3, 6, 12 and 48 h after PO stimuli. Results revealed an immediate switch in the expression of genes encoding alpha and beta isoforms of myosin heavy chain, and up-regulation of the cardiac isoform of alpha actin. We also detected transitory gene regulation as the increase in mitochondrial cytochrome c oxidase 1 gene expression, parallel to down-regulation of genes encoding sarco(endo)plasmic reticulum Ca+2 ATPase and sodium-calcium exchanger. Taken together, these results indicate that initial myocardial responses to increased work load include alterations in the contractile properties of sarcomeres and transitory adjustment of mitochondrial bioenergetics and calcium availability.
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Affiliation(s)
- Ana Carolina Deckmann
- Departamento de Genética e Evolução, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP Brazil
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25
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Driesen RB, Verheyen FK, Debie W, Blaauw E, Babiker FA, Cornelussen RNM, Ausma J, Lenders MH, Borgers M, Chaponnier C, Ramaekers FCS. Re-expression of alpha skeletal actin as a marker for dedifferentiation in cardiac pathologies. J Cell Mol Med 2009; 13:896-908. [PMID: 19538254 PMCID: PMC3823406 DOI: 10.1111/j.1582-4934.2008.00523.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Differentiation of foetal cardiomyocytes is accompanied by sequential actin isoform expression, i.e. down-regulation of the ‘embryonic’ alpha smooth muscle actin, followed by an up-regulation of alpha skeletal actin (αSKA) and a final predominant expression of alpha cardiac actin (αCA). Our objective was to detect whether re-expression of αSKA occurred during cardiomyocyte dedifferentiation, a phenomenon that has been observed in different pathologies characterized by myocardial dysfunction. Immunohistochemistry of αCA, αSKA and cardiotin was performed on left ventricle biopsies from human patients after coronary bypass surgery. Furthermore, actin isoform expression was investigated in left ventricle samples of rabbit hearts suffering from pressure- and volume-overload and in adult rabbit ventricular cardiomyocytes during dedifferentiation in vitro. Atrial goat samples up to 16 weeks of sustained atrial fibrillation (AF) were studied ultrastructurally and were immunostained for αCA and αSKA. Up-regulation of αSKA was observed in human ventricular cardiomyocytes showing down-regulation of αCA and cardiotin. A patchy re-expression pattern of αSKA was observed in rabbit left ventricular tissue subjected to pressure- and volume-overload. Dedifferentiating cardiomyocytes in vitro revealed a degradation of the contractile apparatus and local re-expression of αSKA. Comparable αSKA staining patterns were found in several areas of atrial goat tissue during 16 weeks of AF together with a progressive glycogen accumulation at the same time intervals. The expression of αSKA in adult dedifferentiating cardiomyocytes, in combination with PAS-positive glycogen and decreased cardiotin expression, offers an additional tool in the evaluation of myocardial dysfunction and indicates major changes in the contractile properties of these cells.
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Affiliation(s)
- Ronald B Driesen
- Department of Molecular Cell Biology, Maastricht University, Maastricht, The Netherlands
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26
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Berni R, Savi M, Bocchi L, Delucchi F, Musso E, Chaponnier C, Gabbiani G, Clement S, Stilli D. Modulation of actin isoform expression before the transition from experimental compensated pressure-overload cardiac hypertrophy to decompensation. Am J Physiol Heart Circ Physiol 2009; 296:H1625-32. [PMID: 19252091 DOI: 10.1152/ajpheart.01057.2008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In a rat model of long-lasting pressure-overload hypertrophy, we investigated whether changes in the relative expression of myocardial actin isoforms are among the early signs of ventricular mechanical dysfunction before the transition toward decompensation. Forty-four rats with infrarenal aortic banding (AC rats) were studied. Hemodynamic parameters were measured 1 mo (AC(1) group; n = 20) or 2 mo (AC(2); n = 24) after aortic ligature. Then subgroups of AC(1) and AC(2) left ventricles (LV) were used to evaluate 1) LV anatomy and fibrosis (morphometry), 2) expression levels (immunoblotting) and spatial distribution (immunohistochemistry) of alpha-skeletal actin (alpha-SKA), alpha-cardiac actin (alpha-CA), and alpha-smooth muscle actin (alpha-SMA), and 3) cell mechanics and calcium transients in enzimatically isolated myocytes. Although the two AC groups exhibited a comparable degree of hypertrophy (+30% in LV mass; +20% in myocyte surface) and a similar increase in the amount of fibrosis compared with control animals (C group; n = 22), a worsening of LV mechanical performance was observed only in AC(2) rats at both organ and cellular levels. Conversely, AC(1) rats exhibited enhanced LV contractility and preserved cellular contractile behavior associated with increased calcium transients. Alpha-SKA expression was upregulated (+60%) in AC(1). In AC(2) ventricles, prolonged hypertension also induced a significant increase in alpha-SMA expression, mainly at the level of arterial vessels. No significant differences among groups were observed in alpha-CA expression. Our findings suggest that alpha-SKA expression regulation and wall remodeling of coronary arterioles participate in the development of impaired kinetics of contraction and relaxation in prolonged hypertension before the occurrence of marked histopathologic changes.
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Affiliation(s)
- Roberta Berni
- Dept. of Evolutionary and Functional Biology, Physiology Section, Univ. of Parma, V. le G. P. Usberti 11/A, I-43100, Italy
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27
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Ravenscroft G, Colley SM, Walker KR, Clement S, Bringans S, Lipscombe R, Fabian VA, Laing NG, Nowak KJ. Expression of cardiac α-actin spares extraocular muscles in skeletal muscle α-actin diseases – Quantification of striated α-actins by MRM-mass spectrometry. Neuromuscul Disord 2008; 18:953-8. [DOI: 10.1016/j.nmd.2008.09.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Revised: 07/09/2008] [Accepted: 09/16/2008] [Indexed: 10/21/2022]
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28
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Prostaglandin E2 induces hypertrophic changes and suppresses alpha-skeletal actin gene expression in rat cardiomyocytes. J Cardiovasc Pharmacol 2008; 50:548-54. [PMID: 18030065 DOI: 10.1097/fjc.0b013e318145ae2e] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Prostaglandin E2 (PGE2) is a potent lipid mediator in a diverse range of biological processes. This study examined the hypertrophic effect of PGE2 in primary cultured rat neonatal cardiomyocytes. PGE2 increased total protein synthesis in a dose-dependent manner, as measured by [3H]-phenylalanine uptake. PGE2 increased the cell size and surface area and induced the reorganization of myofilaments. Phosphorylation of the p42/44 and p38 mitogen-activated protein kinases (MAPK) was also induced by PGE2, and U0126 [a mitogen-activated extracellular signal regulated kinase kinase (MEK) 1/2 inhibitor] significantly inhibited the PGE2-induced protein synthesis. Expression of the hypertrophic marker genes, atrial natriuretic peptide and brain natriuretic peptide, was increased by PGE2, but expression of the alpha-skeletal actin gene was significantly attenuated. Transcripts for all 4 PGE2 receptor subtypes (EP1, EP2, EP3, and EP4) were detected in the cardiomyocytes. AE3-208 (an EP4-selective antagonist) significantly inhibited the alpha-skeletal actin gene suppression induced by PGE2, whereas SC51322 (an EP1-selective antagonist) did not. In conclusion, PGE2 induced hypertrophic changes in cardiomyocytes and attenuated alpha-skeletal actin gene expression in part via EP4.
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29
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Gustafson-Wagner EA, Sinn HW, Chen YL, Wang DZ, Reiter RS, Lin JLC, Yang B, Williamson RA, Chen J, Lin CI, Lin JJC. Loss of mXinalpha, an intercalated disk protein, results in cardiac hypertrophy and cardiomyopathy with conduction defects. Am J Physiol Heart Circ Physiol 2007; 293:H2680-92. [PMID: 17766470 PMCID: PMC2394510 DOI: 10.1152/ajpheart.00806.2007] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The intercalated disk protein Xin was originally discovered in chicken striated muscle and implicated in cardiac morphogenesis. In the mouse, there are two homologous genes, mXinalpha and mXinbeta. The human homolog of mXinalpha, Cmya1, maps to chromosomal region 3p21.2-21.3, near a dilated cardiomyopathy with conduction defect-2 locus. Here we report that mXinalpha-null mouse hearts are hypertrophied and exhibit fibrosis, indicative of cardiomyopathy. A significant upregulation of mXinbeta likely provides partial compensation and accounts for the viability of the mXinalpha-null mice. Ultrastructural studies of mXinalpha-null mouse hearts reveal intercalated disk disruption and myofilament disarray. In mXinalpha-null mice, there is a significant decrease in the expression level of p120-catenin, beta-catenin, N-cadherin, and desmoplakin, which could compromise the integrity of the intercalated disks and functionally weaken adhesion, leading to cardiac defects. Additionally, altered localization and decreased expression of connexin 43 are observed in the mXinalpha-null mouse heart, which, together with previously observed abnormal electrophysiological properties of mXinalpha-deficient mouse ventricular myocytes, could potentially lead to conduction defects. Indeed, ECG recordings on isolated, perfused hearts (Langendorff preparations) show a significantly prolonged QT interval in mXinalpha-deficient hearts. Thus mXinalpha functions in regulating the hypertrophic response and maintaining the structural integrity of the intercalated disk in normal mice, likely through its association with adherens junctional components and actin cytoskeleton. The mXinalpha-knockout mouse line provides a novel model of cardiac hypertrophy and cardiomyopathy with conduction defects.
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30
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Stilli D, Lagrasta C, Berni R, Bocchi L, Savi M, Delucchi F, Graiani G, Monica M, Maestri R, Baruffi S, Rossi S, Macchi E, Musso E, Quaini F. Preservation of ventricular performance at early stages of diabetic cardiomyopathy involves changes in myocyte size, number and intercellular coupling. Basic Res Cardiol 2007; 102:488-99. [PMID: 17585379 DOI: 10.1007/s00395-007-0665-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2007] [Revised: 05/03/2007] [Accepted: 05/23/2007] [Indexed: 01/07/2023]
Abstract
In a rat model of diabetic cardiomyopathy, we tested whether specific changes in myocyte turnover and intercellular coupling contribute to preserving ventricular performance after a short period of hyperglycemia. In 41 rats with streptozotocin-induced diabetes and 24 control animals, cardiac electromechanical properties were assessed by telemetry ECG, epicardial potential mapping, and hemodynamic measurements to document normal ventricular function. Myocardial remodeling, expression of gap-junction proteins and myocyte regeneration were evaluated by tissue morphometry, immunohistochemistry and immunoblotting. Ventricular myocyte number and volume were also determined. In diabetic hearts, after 3 weeks of hyperglycemia, left ventricular mass was lowered by 23%, while left ventricular wall thickness and chamber volume were maintained, in the absence of fibrosis and myocyte hypertrophy. In the presence of a marked DNA oxidative damage, an increased rate of DNA replication and mitotic divisions associated with generation of new myocytes were detected. The number of cells expressing the receptor for Stem Cell Factor (c-kit) and their rate of proliferation were preserved in the left ventricle while the atrial storage of these primitive cells was severely reduced by diabetes-induced oxidative stress. Despite a down-regulation of Connexin43 and over-expression of both Connexin40 and Connexin45, the junctional proteins were normally distributed in diabetic ventricular myocardium,justifying the preserved tissue excitability and conduction velocity. In conclusion, before the appearance of the diabetic cardiomyopathic phenotype,myocardial cell proliferation associated with gap junction protein remodeling may contribute to prevent marked alterations of cardiac structure and electrophysiological properties, preserving ventricular performance.
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Affiliation(s)
- Donatella Stilli
- Dept of Evolutionary and Functional, Biology-Physiology Section, University of Parma, Parma, Italy.
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Schroen B, Leenders JJ, van Erk A, Bertrand AT, van Loon M, van Leeuwen RE, Kubben N, Duisters RF, Schellings MW, Janssen BJ, Debets JJ, Schwake M, Høydal MA, Heymans S, Saftig P, Pinto YM. Lysosomal integral membrane protein 2 is a novel component of the cardiac intercalated disc and vital for load-induced cardiac myocyte hypertrophy. J Exp Med 2007; 204:1227-35. [PMID: 17485520 PMCID: PMC2118572 DOI: 10.1084/jem.20070145] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2007] [Accepted: 04/16/2007] [Indexed: 01/01/2023] Open
Abstract
The intercalated disc (ID) of cardiac myocytes is emerging as a crucial structure in the heart. Loss of ID proteins like N-cadherin causes lethal cardiac abnormalities, and mutations in ID proteins cause human cardiomyopathy. A comprehensive screen for novel mechanisms in failing hearts demonstrated that expression of the lysosomal integral membrane protein 2 (LIMP-2) is increased in cardiac hypertrophy and heart failure in both rat and human myocardium. Complete loss of LIMP-2 in genetically engineered mice did not affect cardiac development; however, these LIMP-2 null mice failed to mount a hypertrophic response to increased blood pressure but developed cardiomyopathy. Disturbed cadherin localization in these hearts suggested that LIMP-2 has important functions outside lysosomes. Indeed, we also find LIMP-2 in the ID, where it associates with cadherin. RNAi-mediated knockdown of LIMP-2 decreases the binding of phosphorylated beta-catenin to cadherin, whereas overexpression of LIMP-2 has the opposite effect. Collectively, our data show that LIMP-2 is crucial to mount the adaptive hypertrophic response to cardiac loading. We demonstrate a novel role for LIMP-2 as an important mediator of the ID.
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Affiliation(s)
- Blanche Schroen
- Department of Experimental and Molecular Cardiology, University of Maastricht, Maastricht, Netherlands
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Characterization of a rat model of right-sided heart failure induced by pulmonary trunk banding. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.jeas.2006.10.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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