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Skogestad J, Albert I, Hougen K, Lothe GB, Lunde M, Eken OS, Veras I, Huynh NTT, Børstad M, Marshall S, Shen X, Louch WE, Robinson EL, Cleveland JC, Ambardekar AV, Schwisow JA, Jonas E, Calejo AI, Morth JP, Taskén K, Melleby AO, Lunde PK, Sjaastad I, Carlson CR, Aronsen JM. Disruption of Phosphodiesterase 3A Binding to SERCA2 Increases SERCA2 Activity and Reduces Mortality in Mice With Chronic Heart Failure. Circulation 2023; 147:1221-1236. [PMID: 36876489 DOI: 10.1161/circulationaha.121.054168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 02/08/2023] [Indexed: 03/07/2023]
Abstract
BACKGROUND Increasing SERCA2 (sarco[endo]-plasmic reticulum Ca2+ ATPase 2) activity is suggested to be beneficial in chronic heart failure, but no selective SERCA2-activating drugs are available. PDE3A (phosphodiesterase 3A) is proposed to be present in the SERCA2 interactome and limit SERCA2 activity. Disruption of PDE3A from SERCA2 might thus be a strategy to develop SERCA2 activators. METHODS Confocal microscopy, 2-color direct stochastic optical reconstruction microscopy, proximity ligation assays, immunoprecipitations, peptide arrays, and surface plasmon resonance were used to investigate colocalization between SERCA2 and PDE3A in cardiomyocytes, map the SERCA2/PDE3A interaction sites, and optimize disruptor peptides that release PDE3A from SERCA2. Functional experiments assessing the effect of PDE3A-binding to SERCA2 were performed in cardiomyocytes and HEK293 vesicles. The effect of SERCA2/PDE3A disruption by the disruptor peptide OptF (optimized peptide F) on cardiac mortality and function was evaluated during 20 weeks in 2 consecutive randomized, blinded, and controlled preclinical trials in a total of 148 mice injected with recombinant adeno-associated virus 9 (rAAV9)-OptF, rAAV9-control (Ctrl), or PBS, before undergoing aortic banding (AB) or sham surgery and subsequent phenotyping with serial echocardiography, cardiac magnetic resonance imaging, histology, and functional and molecular assays. RESULTS PDE3A colocalized with SERCA2 in human nonfailing, human failing, and rodent myocardium. Amino acids 277-402 of PDE3A bound directly to amino acids 169-216 within the actuator domain of SERCA2. Disruption of PDE3A from SERCA2 increased SERCA2 activity in normal and failing cardiomyocytes. SERCA2/PDE3A disruptor peptides increased SERCA2 activity also in the presence of protein kinase A inhibitors and in phospholamban-deficient mice, and had no effect in mice with cardiomyocyte-specific inactivation of SERCA2. Cotransfection of PDE3A reduced SERCA2 activity in HEK293 vesicles. Treatment with rAAV9-OptF reduced cardiac mortality compared with rAAV9-Ctrl (hazard ratio, 0.26 [95% CI, 0.11 to 0.63]) and PBS (hazard ratio, 0.28 [95% CI, 0.09 to 0.90]) 20 weeks after AB. Mice injected with rAAV9-OptF had improved contractility and no difference in cardiac remodeling compared with rAAV9-Ctrl after aortic banding. CONCLUSIONS Our results suggest that PDE3A regulates SERCA2 activity through direct binding, independently of the catalytic activity of PDE3A. Targeting the SERCA2/PDE3A interaction prevented cardiac mortality after AB, most likely by improving cardiac contractility.
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Affiliation(s)
- Jonas Skogestad
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Ingrid Albert
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Karina Hougen
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Gustav B Lothe
- Department of Pharmacology, Oslo University Hospital, Norway (G.B.L.)
- Bjørknes College, Oslo, Norway (G.B.L., J.M.A.)
| | - Marianne Lunde
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Olav Søvik Eken
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Ioanni Veras
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Ngoc Trang Thi Huynh
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Mira Børstad
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Serena Marshall
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Xin Shen
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - William E Louch
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Emma Louise Robinson
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Joseph C Cleveland
- Department of Surgery (J.C.C.), University of Colorado Anschutz Medical Campus, Aurora
| | - Amrut V Ambardekar
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Jessica A Schwisow
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Eric Jonas
- Division of Cardiology, Department of Medicine (E.L.R., A.V.A., J.A.S., E.J.), University of Colorado Anschutz Medical Campus, Aurora
| | - Ana I Calejo
- Centre for Molecular Medicine Norway, Nordic European Molecular Biology Laboratory Partnership (A.I.C.C., J.P.M., K.T.), Oslo University Hospital and University of Oslo, Norway
| | - Jens Preben Morth
- Centre for Molecular Medicine Norway, Nordic European Molecular Biology Laboratory Partnership (A.I.C.C., J.P.M., K.T.), Oslo University Hospital and University of Oslo, Norway
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby (J.P.M.)
| | - Kjetil Taskén
- Centre for Molecular Medicine Norway, Nordic European Molecular Biology Laboratory Partnership (A.I.C.C., J.P.M., K.T.), Oslo University Hospital and University of Oslo, Norway
- Institute for Cancer Research, Oslo University Hospital and Institute for Clinical Medicine, University of Oslo, Norway (K.T.)
| | - Arne Olav Melleby
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
| | - Per Kristian Lunde
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Ivar Sjaastad
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Cathrine Rein Carlson
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
| | - Jan Magnus Aronsen
- Institute for Experimental Medical Research (J.S., I.A., K.H., M.L., O.S.E., I.V., M.B., S.M., X.S., W.E.L., P.K.L., I.S., C.R.C., J.M.A.), Oslo University Hospital and University of Oslo, Norway
- Bjørknes College, Oslo, Norway (G.B.L., J.M.A.)
- Department of Molecular Medicine, University of Oslo, Norway (O.S.E., I.V., N.T.T.-H., A.O.M., J.M.A.)
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Danielsen TK, Sadredini M, Manotheepan R, Aronsen JM, Frisk M, Hansen MH, Andressen KW, Hougen K, Levy FO, Louch WE, Sejersted OM, Sjaastad I, Stokke MK. Exercise Training Stabilizes RyR2-Dependent Ca 2+ Release in Post-infarction Heart Failure. Front Cardiovasc Med 2021; 7:623922. [PMID: 33569394 PMCID: PMC7868397 DOI: 10.3389/fcvm.2020.623922] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/17/2020] [Indexed: 11/20/2022] Open
Abstract
Aim: Dysfunction of the cardiac ryanodine receptor (RyR2) is an almost ubiquitous finding in animal models of heart failure (HF) and results in abnormal Ca2+ release in cardiomyocytes that contributes to contractile impairment and arrhythmias. We tested whether exercise training (ET), as recommended by current guidelines, had the potential to stabilize RyR2-dependent Ca2+ release in rats with post-myocardial infarction HF. Materials and Methods: We subjected male Wistar rats to left coronary artery ligation or sham operations. After 1 week, animals were characterized by echocardiography and randomized to high-intensity interval ET on treadmills or to sedentary behavior (SED). Running speed was adjusted based on a weekly VO2max test. We repeated echocardiography after 5 weeks of ET and harvested left ventricular cardiomyocytes for analysis of RyR2-dependent systolic and spontaneous Ca2+ release. Phosphoproteins were analyzed by Western blotting, and beta-adrenoceptor density was quantified by radioligand binding. Results: ET increased VO2max in HF-ET rats to 127% of HF-SED (P < 0.05). This coincided with attenuated spontaneous SR Ca2+ release in left ventricular cardiomyocytes from HF-ET but also reduced Ca2+ transient amplitude and slowed Ca2+ reuptake during adrenoceptor activation. However, ventricular diameter and fractional shortening were unaffected by ET. Analysis of Ca2+ homeostasis and major proteins involved in the regulation of SR Ca2+ release and reuptake could not explain the attenuated spontaneous SR Ca2+ release or reduced Ca2+ transient amplitude. Importantly, measurements of beta-adrenoceptors showed a normalization of beta1-adrenoceptor density and beta1:beta2-adrenoceptor ratio in HF-ET. Conclusion: ET increased aerobic capacity in post-myocardial infarction HF rats and stabilized RyR2-dependent Ca2+ release. Our data show that these effects of ET can be gained without major alterations in SR Ca2+ regulatory proteins and indicate that future studies should include upstream parts of the sympathetic signaling pathway.
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Affiliation(s)
- Tore Kristian Danielsen
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Mani Sadredini
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Ravinea Manotheepan
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Jan Magnus Aronsen
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Bjørknes College, Oslo, Norway
| | - Michael Frisk
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Marie Haugsten Hansen
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Kjetil Wessel Andressen
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Karina Hougen
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Finn Olav Levy
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - William E Louch
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Ole Mathias Sejersted
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Ivar Sjaastad
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
| | - Mathis Korseberg Stokke
- Institute for Experimental Medical Research, Oslo University Hospital, University of Oslo, Oslo, Norway.,Kristian Gerhard (KG) Jebsen Centre for Cardiac Research, University of Oslo, Oslo, Norway
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Skogestad J, Aronsen JM, Tovsrud N, Wanichawan P, Hougen K, Stokke MK, Carlson CR, Sjaastad I, Sejersted OM, Swift F. Coupling of the Na+/K+-ATPase to Ankyrin B controls Na+/Ca2+ exchanger activity in cardiomyocytes. Cardiovasc Res 2020; 116:78-90. [PMID: 30949686 DOI: 10.1093/cvr/cvz087] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 02/22/2019] [Accepted: 04/03/2019] [Indexed: 01/28/2023] Open
Abstract
AIMS Ankyrin B (AnkB) is an adaptor protein that assembles Na+/K+-ATPase (NKA) and Na+/Ca2+ exchanger (NCX) in the AnkB macromolecular complex. Loss-of-function mutations in AnkB cause the AnkB syndrome in humans, characterized by ventricular arrhythmias and sudden cardiac death. It is unclear to what extent NKA binding to AnkB allows regulation of local Na+ and Ca2+ domains and hence NCX activity. METHODS AND RESULTS To investigate the role of NKA binding to AnkB in cardiomyocytes, we synthesized a disruptor peptide (MAB peptide) and its AnkB binding ability was verified by pulldown experiments. As opposed to control, the correlation between NKA and NCX currents was abolished in adult rat ventricular myocytes dialyzed with MAB peptide, as well as in cardiomyocytes from AnkB+/- mice. Disruption of NKA from AnkB (with MAB peptide) increased NCX-sensed cytosolic Na+ concentration, reduced Ca2+ extrusion through NCX, and increased frequency of Ca2+ sparks and Ca2+ waves without concomitant increase in Ca2+ transient amplitude or SR Ca2+ load, suggesting an effect in local Ca2+ domains. Selective inhibition of the NKAα2 isoform abolished both the correlation between NKA and NCX currents and the increased rate of Ca2+ sparks and waves following NKA/AnkB disruption, suggesting that an AnkB/NKAα2/NCX domain controls Ca2+ fluxes in cardiomyocytes. CONCLUSION NKA binding to AnkB allows ion regulation in a local domain, and acute disruption of the NKA/AnkB interaction using disruptor peptides lead to increased rate of Ca2+ sparks and waves. The functional effects were mediated through the NKAα2 isoform. Disruption of the AnkB/NKA/NCX domain could be an important pathophysiological mechanism in the AnkB syndrome.
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Affiliation(s)
- Jonas Skogestad
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Jan Magnus Aronsen
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,Bjørknes College, Oslo, Norway
| | - Nils Tovsrud
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Pimthanya Wanichawan
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Karina Hougen
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Mathis Korseberg Stokke
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway.,Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Cathrine Rein Carlson
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Ivar Sjaastad
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Ole Mathias Sejersted
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway
| | - Fredrik Swift
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Ullevål, N-0407 Oslo, Norway.,KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, University of Oslo, Oslo, Norway.,Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
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Meier S, Andressen KW, Aronsen JM, Sjaastad I, Hougen K, Skomedal T, Osnes JB, Qvigstad E, Levy FO, Moltzau LR. PDE3 inhibition by C-type natriuretic peptide-induced cGMP enhances cAMP-mediated signaling in both non-failing and failing hearts. Eur J Pharmacol 2017; 812:174-183. [PMID: 28697992 DOI: 10.1016/j.ejphar.2017.07.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 12/28/2022]
Abstract
We have previously shown that the natriuretic peptide receptor B (NPR-B) agonist C-type natriuretic peptide (CNP) enhances cyclic adenosine 3´,5´-monophosphate (cAMP)-mediated signaling in failing hearts, through cyclic guanosine 3´,5´-monophosphate (cGMP)-mediated phosphodiesterase (PDE) 3 inhibition. As several signaling pathways are importantly changed in failing hearts, it could not be taken for granted that this crosstalk would be the same in non-failing hearts. Thus, we wanted to clarify to which extent this effect of CNP occurred also in non-failing hearts. Inotropic and lusitropic responses were measured in muscle strips and cGMP levels, localized cAMP levels, cAMP-PDE activity and mRNA levels were analyzed in isolated cardiomyocytes from left ventricles of non-failing and failing rat hearts. CNP increased cGMP and enhanced β1- and β2-adrenoceptor-mediated inotropic and β1-adrenoceptor-mediated lusitropic responses, in non-failing and failing hearts. The NPR-A agonist brain natriuretic peptide (BNP) increased cGMP, but did not affect inotropic or lusitropic responses, indicating different compartmentation of cGMP from the two natriuretic peptide receptors. cAMP-PDE activity of PDE3 was concentration-dependently inhibited by cGMP with the same potency and to the same extent in non-failing and failing cardiomyocytes. CNP enhanced β1-adrenoceptor-induced cAMP increase in living cardiomyocytes in the absence, but not in the presence of a PDE3 inhibitor indicating involvement of PDE3. In summary, CNP sensitizes cAMP-mediated signaling in non-failing as in failing hearts, via NPR-B-mediated increase of cGMP that inhibits the cAMP-PDE activity of PDE3.
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Affiliation(s)
- Silja Meier
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Kjetil Wessel Andressen
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Jan Magnus Aronsen
- Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Institute for Experimental Medical Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Bjørknes College, Oslo, Norway
| | - Ivar Sjaastad
- Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Institute for Experimental Medical Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Karina Hougen
- Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Institute for Experimental Medical Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Tor Skomedal
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Jan-Bjørn Osnes
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Eirik Qvigstad
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
| | - Finn Olav Levy
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway.
| | - Lise Román Moltzau
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
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Aronsen JM, Skogestad J, Lewalle A, Louch WE, Hougen K, Stokke MK, Swift F, Niederer S, Smith NP, Sejersted OM, Sjaastad I. Hypokalaemia induces Ca²⁺ overload and Ca²⁺ waves in ventricular myocytes by reducing Na⁺,K⁺-ATPase α₂ activity. J Physiol 2014; 593:1509-21. [PMID: 25772299 DOI: 10.1113/jphysiol.2014.279893] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 10/02/2014] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Hypokalaemia is a risk factor for development of ventricular arrhythmias. In rat ventricular myocytes, low extracellular K(+) (corresponding to clinical moderate hypokalaemia) increased Ca(2+) wave probability, Ca(2+) transient amplitude, sarcoplasmic reticulum (SR) Ca(2+) load and induced SR Ca(2+) leak. Low extracellular K(+) reduced Na(+),K(+)-ATPase (NKA) activity and hyperpolarized the resting membrane potential in ventricular myocytes. Both experimental data and modelling indicate that reduced NKA activity and subsequent Na(+) accumulation sensed by the Na(+), Ca(2+) exchanger (NCX) lead to increased Ca(2+) transient amplitude despite concomitant hyperpolarization of the resting membrane potential. Low extracellular K(+) induced Ca(2+) overload by lowering NKA α2 activity. Triggered ventricular arrhythmias in patients with hypokalaemia may therefore be attributed to reduced NCX forward mode activity linked to an effect on the NKA α2 isoform. ABSTRACT Hypokalaemia is a risk factor for development of ventricular arrhythmias. The aim of this study was to determine the cellular mechanisms leading to triggering of arrhythmias in ventricular myocytes exposed to low Ko. Low Ko, corresponding to moderate hypokalaemia, increased Ca(2+) transient amplitude, sarcoplasmic reticulum (SR) Ca(2+) load, SR Ca(2+) leak and Ca(2+) wave probability in field stimulated rat ventricular myocytes. The mechanisms leading to Ca(2+) overload were examined. Low Ko reduced Na(+),K(+)-ATPase (NKA) currents, increased cytosolic Na(+) concentration and increased the Na(+) level sensed by the Na(+), Ca(2+) exchanger (NCX). Low Ko also hyperpolarized the resting membrane potential (RMP) without significant alterations in action potential duration. Experiments in voltage clamped and field stimulated ventricular myocytes, along with mathematical modelling, suggested that low Ko increases the Ca(2+) transient amplitude by reducing NKA activity despite hyperpolarization of the RMP. Selective inhibition of the NKA α2 isoform by low dose ouabain abolished the ability of low Ko to reduce NKA currents, to increase Na(+) levels sensed by NCX and to increase the Ca(2+) transient amplitude. We conclude that low Ko, within the range of moderate hypokalaemia, increases Ca(2+) levels in ventricular myocytes by reducing the pumping rate of the NKA α2 isoform with subsequent Na(+) accumulation sensed by the NCX. These data highlight reduced NKA α2 -mediated control of NCX activity as a possible mechanism underlying triggered ventricular arrhythmias in patients with hypokalaemia.
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Affiliation(s)
- J M Aronsen
- Institute for Experimental Medical Research, Oslo University Hospital Ullevål and University of Oslo, Oslo, Norway; Bjørknes College, Oslo, Norway
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Moltzau LR, Aronsen JM, Meier S, Nguyen CHT, Hougen K, Ørstavik Ø, Sjaastad I, Christensen G, Skomedal T, Osnes JB, Levy FO, Qvigstad E. SERCA2 activity is involved in the CNP-mediated functional responses in failing rat myocardium. Br J Pharmacol 2014; 170:366-79. [PMID: 23808942 DOI: 10.1111/bph.12282] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 06/03/2013] [Accepted: 06/10/2013] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSES Myocardial C-type natriuretic peptide (CNP) levels are increased in heart failure. CNP can induce negative inotropic (NIR) and positive lusitropic responses (LR) in normal hearts, but its effects in failing hearts are not known. We studied the mechanism of CNP-induced NIR and LR in failing hearts and determined whether sarcoplasmatic reticulum Ca(2+) ATPase2 (SERCA2) activity is essential for these responses. EXPERIMENTAL APPROACH Contractility, cGMP levels, Ca(2+) transient amplitudes and protein phosphorylation were measured in left ventricular muscle strips or ventricular cardiomyocytes from failing hearts of Wistar rats 6 weeks after myocardial infarction. KEY RESULTS CNP increased cGMP levels, evoked a NIR and LR in muscle strips, and caused phospholamban (PLB) Ser(16) and troponin I (TnI) Ser(23/24) phosphorylation in cardiomyocytes. Both the NIR and LR induced by CNP were reduced in the presence of a PKG blocker/cGMP analogue (Rp-8-Br-Pet-cGMPS) and the SERCA inhibitor thapsigargin. CNP increased the amplitude of the Ca(2+) transient and increased SERCA2 activity in cardiomyocytes. The CNP-elicited NIR and LR were not affected by the L-type Ca(2+) channel activator BAY-K8644, but were abolished in the presence of isoprenaline (induces maximal activation of cAMP pathway). This suggests that phosphorylation of PLB and TnI by CNP causes both a NIR and LR. The NIR to CNP in mouse heart was abolished 8 weeks after cardiomyocyte-specific inactivation of the SERCA2 gene. CONCLUSIONS AND IMPLICATIONS We conclude that CNP-induced PLB and TnI phosphorylation by PKG in concert mediate both a predictable LR as well as the less expected NIR in failing hearts.
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Affiliation(s)
- L R Moltzau
- Department of Pharmacology, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; KG Jebsen Cardiac Research Centre and Center for Heart Failure Research, Faculty of Medicine, University of Oslo, Oslo, Norway
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Danielsen T, Manotheepan R, Sadredini M, Aronsen J, Hougen K, Sejersted O, Sjaastad I, Stokke M. The Effect of Exercise Training on Ca2+ Wave Probability After Myocardial Infarction Depends on Cardiac Function at Onset of Training. Heart Rhythm 2013. [DOI: 10.1016/j.hrthm.2013.09.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Stokke MK, Tovsrud N, Louch WE, Øyehaug L, Hougen K, Sejersted OM, Swift F, Sjaastad I. I(CaL) inhibition prevents arrhythmogenic Ca(2+) waves caused by abnormal Ca(2+) sensitivity of RyR or SR Ca(2+) accumulation. Cardiovasc Res 2013; 98:315-25. [PMID: 23417043 DOI: 10.1093/cvr/cvt037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIMS Arrhythmogenic Ca(2+) waves result from uncontrolled Ca(2+) release from the sarcoplasmic reticulum (SR) that occurs with increased Ca(2+) sensitivity of the ryanodine receptor (RyR) or excessive Ca(2+) accumulation during β-adrenergic stimulation. We hypothesized that inhibition of the L-type Ca(2+) current (I(CaL)) could prevent such Ca(2+) waves in both situations. METHODS AND RESULTS Ca(2+) waves were induced in mouse left ventricular cardiomyocytes by isoproterenol combined with caffeine to increase RyR Ca(2+) sensitivity. I(CaL) inhibition by verapamil (0.5 µM) reduced Ca(2+) wave probability in cardiomyocytes during electrostimulation, and during a 10 s rest period after ceasing stimulation. A separate type of Ca(2+) release events occurred during the decay phase of the Ca(2+) transient and was not prevented by verapamil. Verapamil decreased Ca(2+) spark frequency, but not in permeabilized cells, indicating that this was not due to direct effects on RyR. The antiarrhythmic effect of verapamil was due to reduced SR Ca(2+) content following I(CaL) inhibition. Computational modelling supported that the level of I(CaL) inhibition obtained experimentally was sufficient to reduce the SR Ca(2+) content. Ca(2+) wave prevention through reduced SR Ca(2+) content was also effective in heterozygous ankyrin B knockout mice with excessive SR Ca(2+) accumulation during β-adrenergic stimulation. CONCLUSION I(CaL) inhibition prevents diastolic Ca(2+) waves caused by increased Ca(2+) sensitivity of RyR or excessive SR Ca(2+) accumulation during β-adrenergic stimulation. In contrast, unstimulated early Ca(2+) release during the decay of the Ca(2+) transient is not prevented, and merits further study to understand the full antiarrhythmic potential of I(CaL) inhibition.
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Affiliation(s)
- Mathis K Stokke
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Oslo, Norway.
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Swift F, Magnus Aronsen J, Stokke MK, Hougen K, Egger M, Roderick HL, Sejersted OM, Sjaastad I. IP3 Receptors in Heart Failure: Arrhythmogenic Troublemakers or SR Calcium Security Valves? Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Hougen K, Aronsen JM, Stokke MK, Enger U, Nygard S, Andersson KB, Christensen G, Sejersted OM, Sjaastad I. Cre-loxP DNA recombination is possible with only minimal unspecific transcriptional changes and without cardiomyopathy in Tg(alphaMHC-MerCreMer) mice. Am J Physiol Heart Circ Physiol 2010; 299:H1671-8. [PMID: 20802136 DOI: 10.1152/ajpheart.01155.2009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cre-loxP technology for conditional gene inactivation is a powerful tool in cardiovascular research. Induction of gene inactivation can be carried out by per oral or intraperitoneal tamoxifen administration. Unintended transient cardiomyopathy following tamoxifen administration for gene inactivation has recently been reported. We aimed to develop a protocol for tamoxifen-induced gene inactivation with minimal effects on gene transcription and in vivo cardiac function, allowing studies of acute loss of the targeted gene. In mRNA microarrays, 35% of the 34,760 examined genes were significantly regulated in MCM(+/0) compared with wild type. In MCM(+/0), we found a correlation between tamoxifen dose and degree of gene regulation. Comparing one and four intraperitoneal injections of 40 mg·kg(-1)·day(-1) tamoxifen, regulated genes were reduced to 1/5 in the single injection group. Pronounced alteration in protein abundance and acute cardiomyopathy were observed after the four-injection protocols but not the one-injection protocol. For verification of gene inactivation following one injection of tamoxifen, this protocol was applied to MCM(+/0)/Serca2(fl/fl). Serca2 mRNA levels and protein abundance followed the same pattern of decline with one and four tamoxifen injections. The presence of the MCM transgene induced major alterations of gene expression while administration of tamoxifen induced additional but less gene regulation. Thus nonfloxed MCM(+/0) should be considered as controls for mice that carry both a floxed gene of interest and the MCM transgene. One single tamoxifen injection administered to MCM(+/0)/Serca2(fl/fl) was sufficient for target gene inactivation, without acute cardiomyopathy, allowing acute studies subsequent to gene inactivation.
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Affiliation(s)
- Karina Hougen
- Institute for Experimental Medical Research, Oslo Univ. Hospital Ullevål, Kirkevn 166, 0407 Oslo, Norway.
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Louch WE, Mørk HK, Hougen K, Sjaastad I, Sejersted OM. Alterations in Ca2+ Sparks and T-Tubules Promote Slowed, Dyssynchronous Ca2+ Release in Failing Cardiomyocytes. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Stokke MK, Hougen K, Sjaastad I, Louch WE, Briston SJ, Enger UH, Andersson KB, Christensen G, Eisner DA, Sejersted OM, Trafford AW. Reduced SERCA2 abundance decreases the propensity for Ca2+ wave development in ventricular myocytes. Cardiovasc Res 2009; 86:63-71. [PMID: 20019150 DOI: 10.1093/cvr/cvp401] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS To describe the overall role of reduced sarcoplasmic reticulum Ca(2+) ATPase (SERCA2) for Ca(2+) wave development. METHODS AND RESULTS SERCA2 knockout [Serca2(flox/flox) Tg(alphaMHC-MerCreMer); KO] mice allowing inducible cardiomyocyte-specific disruption of the Serca2 gene in adult mice were compared with Serca(flox/flox) (FF) control mice. Six days after Serca2 gene disruption, SERCA2 protein abundance was reduced by 53% in KO compared with FF, whereas SERCA2 activity in field-stimulated, Fluo-5F AM-loaded cells was reduced by 42%. Baseline Ca(2+) content of the sarcoplasmic reticulum (SR) and Ca(2+) transient amplitude and rate constant of decay measured in whole-cell voltage-clamped cells were decreased in KO to 75, 81, and 69% of FF values. Ca(2+) waves developed in only 31% of KO cardiomyocytes compared with 57% of FF when external Ca(2+) was raised (10 mM), although SR Ca(2+) content needed for waves to develop was 79% of FF values. In addition, waves propagated at a 15% lower velocity in KO cells. Ventricular extrasystoles (VES) occurred with lower frequency in SERCA2 KO mice (KO: 3 +/- 1 VES/h vs. FF: 8 +/- 1 VES/h) (P < 0.05 for all results). CONCLUSION Reduced SERCA2 abundance resulted in decreased amplitude and decay rate of Ca(2+) transients, reduced SR Ca(2+) content, and decreased propensity for Ca(2+) wave development.
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Affiliation(s)
- Mathis K Stokke
- Institute for Experimental Medical Research, Oslo University Hospital, Ullevål, Kirkeveien 166, N-0407 Oslo, Norway.
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Louch WE, Hougen K, Mørk HK, Swift F, Aronsen JM, Sjaastad I, Reims HM, Roald B, Andersson KB, Christensen G, Sejersted OM. Sodium accumulation promotes diastolic dysfunction in end-stage heart failure following Serca2 knockout. J Physiol 2009; 588:465-78. [PMID: 20008467 DOI: 10.1113/jphysiol.2009.183517] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Alterations in trans-sarcolemmal and sarcoplasmic reticulum (SR) Ca(2+) fluxes may contribute to impaired cardiomyocyte contraction and relaxation in heart failure. We investigated the mechanisms underlying heart failure progression in mice with conditional, cardiomyocyte-specific excision of the SR Ca(2+)-ATPase (SERCA) gene. At 4 weeks following gene deletion (4-week KO) cardiac function remained near normal values. However, end-stage heart failure developed by 7 weeks (7-week KO) as systolic and diastolic performance declined. Contractions in isolated myocytes were reduced between 4- and 7-week KO, and relaxation was slowed. Ca(2+) transients were similarly altered. Reduction in Ca(2+) transient magnitude resulted from complete loss of SR Ca(2+) release between 4- and 7-week KO, due to loss of a small remaining pool of SERCA2. Declining SR Ca(2+) release was partly offset by increased L-type Ca(2+) current, which was facilitated by AP prolongation in 7-week KO. Ca(2+) entry via reverse-mode Na(+)-Ca(2+) exchange (NCX) was also enhanced. Up-regulation of NCX and plasma membrane Ca(2+)-ATPase increased Ca(2+) extrusion rates in 4-week KO. Diastolic dysfunction in 7-week KO resulted from further SERCA2 loss, but also impaired NCX-mediated Ca(2+) extrusion following Na(+) accumulation. Reduced Na(+)-K(+)-ATPase activity contributed to the Na(+) gain. Normalizing [Na(+)] by dialysis increased the Ca(2+) decline rate in 7-week KO beyond 4-week values. Thus, while SERCA2 loss promotes both systolic and diastolic dysfunction, Na(+) accumulation additionally impairs relaxation in this model. Our observations indicate that if cytosolic Na(+) gain is prevented, up-regulated Ca(2+) extrusion mechanisms can maintain near-normal diastolic function in the absence of SERCA2.
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Affiliation(s)
- William E Louch
- Institute for Experimental Medical Research, Oslo University Hospital Ullevaal, 0407 Oslo, Norway.
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Qvigstad E, Moltzau LR, Aronsen JM, Nguyen CHT, Hougen K, Sjaastad I, Levy FO, Skomedal T, Osnes JB. Natriuretic peptides increase beta1-adrenoceptor signalling in failing hearts through phosphodiesterase 3 inhibition. Cardiovasc Res 2009; 85:763-72. [PMID: 19900965 DOI: 10.1093/cvr/cvp364] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
AIMS Whereas natriuretic peptides increase cGMP levels with beneficial cardiovascular effects through protein kinase G, we found an unexpected cardio-excitatory effect of C-type natriuretic peptide (CNP) through natriuretic peptide receptor B (NPR-B) stimulation in failing cardiac muscle and explored the mechanism. METHODS AND RESULTS Heart failure was induced in male Wistar rats by coronary artery ligation. Contraction studies were performed in left ventricular muscle strips. Cyclic nucleotides were measured by radio- and enzyme immunoassay. Apoptosis was determined in isolated cardiomyocytes by Annexin-V/propidium iodide staining and phosphorylation of phospholamban (PLB) and troponin I was measured by western blotting. Stimulation of NPR-B enhanced beta1-adrenoceptor (beta1-AR)-evoked contractile responses through cGMP-mediated inhibition of phosphodiesterase 3 (PDE3). CNP enhanced beta1-AR-mediated increase of cAMP levels to the same extent as the selective PDE3 inhibitor cilostamide and increased beta1-AR-stimulated protein kinase A activity, as demonstrated by increased PLB and troponin I phosphorylation. CNP promoted cardiomyocyte apoptosis similar to inhibition of PDE3 by cilostamide, indicative of adverse effects of NPR-B signalling in failing hearts. CONCLUSION An NPR-B-cGMP-PDE3 inhibitory pathway enhances beta(1)-AR-mediated responses and may in the long term be detrimental to the failing heart through mechanisms similar to those operating during treatment with PDE3 inhibitors or during chronic beta-adrenergic stimulation.
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Affiliation(s)
- Eirik Qvigstad
- Department of Pharmacology, University of Oslo, PO Box 1057 Blindern, Oslo 0316, Norway
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Hougen K. [The Health Committee and the distribution of dentists]. Nor Tannlaegeforen Tid 1968; 78:754-5. [PMID: 5257800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Hougen K. [Development of our social dental prophylaxis service and the distribution of dentists]. Nor Tannlaegeforen Tid 1968; 78:600-1. [PMID: 5257160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Hougen K. [Educational activities in the dental health service]. Nor Tannlaegeforen Tid 1968; 78:255-62. [PMID: 4174919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Hougen K. [Caries registration in the public health service]. Nor Tannlaegeforen Tid 1965; 75:427-9. [PMID: 4379026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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