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Benzoni P, Arici M, Giannetti F, Cospito A, Prevostini R, Volani C, Fassina L, Rosato-Siri MD, Metallo A, Gennaccaro L, Suffredini S, Foco L, Mazzetti S, Calogero A, Cappelletti G, Leibbrandt A, Elling U, Broso F, Penninger JM, Pramstaller PP, Piubelli C, Bucchi A, Baruscotti M, Rossini A, Rocchetti M, Barbuti A. Striatin knock out induces a gain of function of I Na and impaired Ca 2+ handling in mESC-derived cardiomyocytes. Acta Physiol (Oxf) 2024; 240:e14160. [PMID: 38747650 DOI: 10.1111/apha.14160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 04/23/2024] [Accepted: 04/24/2024] [Indexed: 07/16/2024]
Abstract
AIM Striatin (Strn) is a scaffold protein expressed in cardiomyocytes (CMs) and alteration of its expression are described in various cardiac diseases. However, the alteration underlying its pathogenicity have been poorly investigated. METHODS We studied the role(s) of cardiac Strn gene (STRN) by comparing the functional properties of CMs, generated from Strn-KO and isogenic WT mouse embryonic stem cell lines. RESULTS The spontaneous beating rate of Strn-KO CMs was faster than WT cells, and this correlated with a larger fast INa conductance and no changes in If. Paced (2-8 Hz) Strn-KO CMs showed prolonged action potential (AP) duration in comparison with WT CMs and this was not associated with changes in ICaL and IKr. Motion video tracking analysis highlighted an altered contraction in Strn-KO CMs; this was associated with a global increase in intracellular Ca2+, caused by an enhanced late Na+ current density (INaL) and a reduced Na+/Ca2+ exchanger (NCX) activity and expression. Immunofluorescence analysis confirmed the higher Na+ channel expression and a more dynamic microtubule network in Strn-KO CMs than in WT. Indeed, incubation of Strn-KO CMs with the microtubule stabilizer taxol, induced a rescue (downregulation) of INa conductance toward WT levels. CONCLUSION Loss of STRN alters CMs electrical and contractile profiles and affects cell functionality by a disarrangement of Strn-related multi-protein complexes. This leads to impaired microtubules dynamics and Na+ channels trafficking to the plasma membrane, causing a global Na+ and Ca2+ enhancement.
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Affiliation(s)
- P Benzoni
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
| | - M Arici
- Department of Biotecnologie e Bioscienze, Università degli Studi di Milano Bicocca Milano, Milan, Italy
| | - F Giannetti
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
| | - A Cospito
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
| | - R Prevostini
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
| | - C Volani
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - L Fassina
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy
| | | | - A Metallo
- Department of Biotecnologie e Bioscienze, Università degli Studi di Milano Bicocca Milano, Milan, Italy
| | - L Gennaccaro
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - S Suffredini
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - L Foco
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - S Mazzetti
- Department of Biosciences, Università Degli Studi Di Milano, Milan, Italy
| | - A Calogero
- Department of Biosciences, Università Degli Studi Di Milano, Milan, Italy
| | - G Cappelletti
- Department of Biosciences, Università Degli Studi Di Milano, Milan, Italy
| | - A Leibbrandt
- IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - U Elling
- IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - F Broso
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - J M Penninger
- IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
- Department of Medical Genetics, The University of British Columbia, Vancouver, British Columbia, Canada
| | | | - C Piubelli
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - A Bucchi
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
| | - M Baruscotti
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
| | - A Rossini
- Institute for Biomedicine, Eurac Research, Bolzano, Italy
| | - M Rocchetti
- Department of Biotecnologie e Bioscienze, Università degli Studi di Milano Bicocca Milano, Milan, Italy
| | - A Barbuti
- Department of Biosciences, The Cell Physiology MiLab, Università Degli Studi Di Milano, Milan, Italy
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Segal S, Yaniv Y. Ca 2+-Driven Selectivity of the Effect of the Cardiotonic Steroid Marinobufagenin on Rabbit Sinoatrial Node Function. Cells 2023; 12:1881. [PMID: 37508546 PMCID: PMC10378090 DOI: 10.3390/cells12141881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 06/19/2023] [Accepted: 07/17/2023] [Indexed: 07/30/2023] Open
Abstract
The synergy between Na+-K+ pumps, Na+-Ca2+ exchangers, membrane currents and the sarcoplasmic reticulum (SR) generates the coupled-clock system, which governs the spontaneous electrical activity of heart sinoatrial node cells (SANCs). Ca2+ mediates the degree of clock coupling via local Ca2+ release (LCR) from the SR and activation of cAMP/PKA signaling. Marinobufagenin (MBG) is a natural Na+-K+ pump inhibitor whose effect on SANCs has not been measured before. The following two hypotheses were tested to determine if and how MBG mediates between the Na+-K+ pump and spontaneous SAN activity: (i) MBG has a distinct effect on beat interval (BI) due to variable effects on LCR characteristics, and (ii) Ca2+ is an important mediator between MBG and SANC activity. Ca2+ transients were measured by confocal microscopy during application of increasing concentrations of MBG. To further support the hypothesis that Ca2+ mediates between MBG and SANC activity, Ca2+ was chelated by the addition of BAPTA. Dose response tests found that 100 nM MBG led to no change in BI in 6 SANCs (no BI change group), and to BI prolongation in 10 SANCs (BI change group). At the same concentration, the LCR period was prolonged in both groups, but more significantly in the BI change group. BAPTA-AM prolonged the BI in 12 SANCs. In the presence of BAPTA, 100 nM MBG had no effect on SANC BI or on the LCR period. In conclusion, the MBG effects on SANC function are mediated by the coupled clock system, and Ca2+ is an important regulator of these effects.
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Affiliation(s)
- Sofia Segal
- Laboratory of Bioelectric and Bioenergetic Systems, Faculty of Biomedical Engineering, Technion-IIT, Haifa 3200003, Israel
| | - Yael Yaniv
- Laboratory of Bioelectric and Bioenergetic Systems, Faculty of Biomedical Engineering, Technion-IIT, Haifa 3200003, Israel
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Zhai Y, Yang J, Zhang J, Yang J, Li Q, Zheng T. Src-family Protein Tyrosine Kinases: A promising target for treating Cardiovascular Diseases. Int J Med Sci 2021; 18:1216-1224. [PMID: 33526983 PMCID: PMC7847615 DOI: 10.7150/ijms.49241] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 12/18/2020] [Indexed: 02/07/2023] Open
Abstract
The Src-family protein tyrosine kinases (SFKs), a subfamily of non-receptor tyrosine kinases, are ubiquitously expressed in various cell types. Numerous studies have suggested that SFKs are related to signal transduction in major cardiac physiological and pathological processes, it is the activity of SFKs that is connected with the maintenance of cardiovascular homeostasis. Upon stimulation of various injury factors or stress, the phosphorylation state of SFKs is changed, which has been found to modulate different cardiac pathological conditions, such as hypertension, coronary heart disease, ischemic heart disease, myocardial ischemia-reperfusion injury, arrhythmia and cardiomyopathy via regulating cell growth, differentiation, movement and function, electrophysiologic signals. This review summarizes the basic information about SFKs, updates its role in the different processes underlying the development of multiple cardiovascular diseases (CVDs), and highlights their potential role as disease biomarkers and therapeutic targets, which would help understand the pathophysiology of CVDs and promote the further potential clinical adhibition.
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Affiliation(s)
- Yuhong Zhai
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University, Yichang 443000, China.,Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, China.,Central Laboratory, Yichang Central People's Hospital, Yichang 443000, China
| | - Jun Yang
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University, Yichang 443000, China.,Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, China
| | - Jing Zhang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, China.,Central Laboratory, Yichang Central People's Hospital, Yichang 443000, China
| | - Jian Yang
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University, Yichang 443000, China
| | - Qi Li
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University, Yichang 443000, China.,Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, China.,Central Laboratory, Yichang Central People's Hospital, Yichang 443000, China
| | - Tao Zheng
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University, Yichang 443000, China.,Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, China.,Central Laboratory, Yichang Central People's Hospital, Yichang 443000, China
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Sizemore G, McLaughlin S, Newman M, Brundage K, Ammer A, Martin K, Pugacheva E, Coad J, Mattes MD, Yu HG. Opening large-conductance potassium channels selectively induced cell death of triple-negative breast cancer. BMC Cancer 2020; 20:595. [PMID: 32586284 PMCID: PMC7318490 DOI: 10.1186/s12885-020-07071-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 06/15/2020] [Indexed: 12/15/2022] Open
Abstract
Background Unlike other breast cancer subtypes that may be treated with a variety of hormonal or targeted therapies, there is a need to identify new, effective targets for triple-negative breast cancer (TNBC). It has recently been recognized that membrane potential is depolarized in breast cancer cells. The primary objective of the study is to explore whether hyperpolarization induced by opening potassium channels may provide a new strategy for treatment of TNBC. Methods Breast cancer datasets in cBioPortal for cancer genomics was used to search for ion channel gene expression. Immunoblots and immunohistochemistry were used for protein expression in culture cells and in the patient tissues. Electrophysiological patch clamp techniques were used to study properties of BK channels in culture cells. Flow cytometry and fluorescence microscope were used for cell viability and cell cycle studies. Ultrasound imaging was used to study xenograft in female NSG mice. Results In large datasets of breast cancer patients, we identified a gene, KCNMA1 (encoding for a voltage- and calcium-dependent large-conductance potassium channel, called BK channel), overexpressed in triple-negative breast cancer patients. Although overexpressed, 99% of channels are closed in TNBC cells. Opening BK channels hyperpolarized membrane potential, which induced cell cycle arrest in G2 phase and apoptosis via caspase-3 activation. In a TNBC cell induced xenograft model, treatment with a BK channel opener significantly slowed tumor growth without cardiac toxicity. Conclusions Our results support the idea that hyperpolarization induced by opening BK channel in TNBC cells can become a new strategy for development of a targeted therapy in TNBC.
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Affiliation(s)
- Gina Sizemore
- Clinical and Translational Sciences Institute, West Virginia University, Morgantown, USA
| | - Sarah McLaughlin
- Animal Models & Imaging Facility, Cancer Institute, West Virginia University, Morgantown, USA
| | - Mackenzie Newman
- Department of Physiology & Pharmacology, West Virginia University, Morgantown, WV, 26506, USA
| | - Kathleen Brundage
- Department of Microbiology and Cell Biology, Flow Cytometry Facility, West Virginia University, Morgantown, USA
| | - Amanda Ammer
- Animal Models & Imaging Facility, Cancer Institute, West Virginia University, Morgantown, USA
| | - Karen Martin
- Animal Models & Imaging Facility, Cancer Institute, West Virginia University, Morgantown, USA
| | - Elena Pugacheva
- Department of Biochemistry, Cancer Institute, West Virginia University, Morgantown, USA
| | - James Coad
- Department of Pathology, West Virginia University, Morgantown, USA
| | - Malcolm D Mattes
- Department of Radiation Oncology, Cancer Institute, West Virginia University, Morgantown, USA
| | - Han-Gang Yu
- Department of Physiology & Pharmacology, West Virginia University, Morgantown, WV, 26506, USA.
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Grzelka K, Kurowski P, Gawlak M, Szulczyk P. Noradrenaline Modulates the Membrane Potential and Holding Current of Medial Prefrontal Cortex Pyramidal Neurons via β 1-Adrenergic Receptors and HCN Channels. Front Cell Neurosci 2017; 11:341. [PMID: 29209170 PMCID: PMC5701640 DOI: 10.3389/fncel.2017.00341] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 10/16/2017] [Indexed: 12/27/2022] Open
Abstract
The medial prefrontal cortex (mPFC) receives dense noradrenergic projections from the locus coeruleus. Adrenergic innervation of mPFC pyramidal neurons plays an essential role in both physiology (control of memory formation, attention, working memory, and cognitive behavior) and pathophysiology (attention deficit hyperactivity disorder, posttraumatic stress disorder, cognitive deterioration after traumatic brain injury, behavioral changes related to addiction, Alzheimer's disease and depression). The aim of this study was to elucidate the mechanism responsible for adrenergic receptor-mediated control of the resting membrane potential in layer V mPFC pyramidal neurons. The membrane potential or holding current of synaptically isolated layer V mPFC pyramidal neurons was recorded in perforated-patch and classical whole-cell configurations in slices from young rats. Application of noradrenaline (NA), a neurotransmitter with affinity for all types of adrenergic receptors, evoked depolarization or inward current in the tested neurons irrespective of whether the recordings were performed in the perforated-patch or classical whole-cell configuration. The effect of noradrenaline depended on β1- and not α1- or α2-adrenergic receptor stimulation. Activation of β1-adrenergic receptors led to an increase in inward Na+ current through hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, which carry a mixed Na+/K+ current. The protein kinase A- and C-, glycogen synthase kinase-3β- and tyrosine kinase-linked signaling pathways were not involved in the signal transduction between β1-adrenergic receptors and HCN channels. The transduction system operated in a membrane-delimited fashion and involved the βγ subunit of G-protein. Thus, noradrenaline controls the resting membrane potential and holding current in mPFC pyramidal neurons through β1-adrenergic receptors, which in turn activate HCN channels via a signaling pathway involving the βγ subunit.
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Affiliation(s)
- Katarzyna Grzelka
- Laboratory of Physiology and Pathophysiology, Centre for Preclinical Research and Technology, Medical University of Warsaw, Warsaw, Poland
| | | | | | - Paweł Szulczyk
- Laboratory of Physiology and Pathophysiology, Centre for Preclinical Research and Technology, Medical University of Warsaw, Warsaw, Poland
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Zhang Z, Huang TQ, Nepliouev I, Zhang H, Barnett AS, Rosenberg PB, Ou SHI, Stiber JA. Crizotinib Inhibits Hyperpolarization-activated Cyclic Nucleotide-Gated Channel 4 Activity. CARDIO-ONCOLOGY 2017; 3. [PMID: 28217366 PMCID: PMC5310672 DOI: 10.1186/s40959-017-0020-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Sinus bradycardia is frequently observed in patients treated with crizotinib, a receptor tyrosine kinase inhibitor used for the treatment of anaplastic lymphoma kinase (ALK)-rearranged non-small cell lung cancer (NSCLC). We investigated whether crizotinib could influence heart rate (HR) through direct cardiac effects. METHODS The direct effect of crizotinib on HR was studied using ECG analysis of Langendorff-perfused mouse hearts. The whole-cell patch clamp technique was used to measure the effects of crizotinib on the hyperpolarization-activated funny current, If, in mouse sinoatrial node cells (SANCs) and hyperpolarization-activated cyclic nucleotide-gated channel 4 (HCN4) activity in HEK-293 cells stably expressing human HCN4. RESULTS Crizotinib resulted in a dose-dependent reduction in HR in isolated intact mouse hearts with a half maximal inhibitory concentration (IC50) of 1.7 ± 0.4 μmol/L. Because ECG analysis revealed that crizotinib (0-5 μmol/L) resulted in significant reductions in HR in isolated mouse hearts without changes in PR, QRS, or QT intervals, we performed whole-cell patch clamp recordings of SANCs which showed that crizotinib inhibited If which regulates cardiac pacemaker activity. Crizotinib resulted in diminished current density of HCN4, the major molecular determinant of If, with an IC50 of 1.4 ± 0.3 μmol/L. Crizotinib also slowed HCN4 activation and shifted the activation curve to the left towards more hyperpolarized potentials. CONCLUSIONS Our results suggest that crizotinib's effects on HCN4 channels play a significant role in mediating its observed effects on HR.
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Affiliation(s)
- Zhushan Zhang
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
| | - Tai-Qin Huang
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
| | - Igor Nepliouev
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
| | - Hengtao Zhang
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
| | - Adam S Barnett
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
| | - Paul B Rosenberg
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
| | - Sai-Hong I Ou
- Department of Medicine, University of California Irvine School of Medicine, Orange, CA 92868
| | - Jonathan A Stiber
- Department of Medicine, Duke University Medical Center, Durham, NC USA 27710
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Lin YC, Huang J, Hileman S, Martin KH, Hull R, Davis M, Yu HG. Leptin decreases heart rate associated with increased ventricular repolarization via its receptor. Am J Physiol Heart Circ Physiol 2015; 309:H1731-9. [PMID: 26408544 DOI: 10.1152/ajpheart.00623.2015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 09/21/2015] [Indexed: 11/22/2022]
Abstract
Leptin has been proposed to modulate cardiac electrical properties via β-adrenergic receptor activation. The presence of leptin receptors and adipocytes in myocardium raised a question as to whether leptin can directly modulate cardiac electrical properties such as heart rate and QT interval via its receptor. In this work, the role of local direct actions of leptin on heart rate and ventricular repolarization was investigated. We identified the protein expression of leptin receptors at cell surface of sinus node, atrial, and ventricular myocytes isolated from rat heart. Leptin at low doses (0.1-30 μg/kg) decreased resting heart rate; at high doses (150-300 μg/kg), leptin induced a biphasic effect (decrease and then increase) on heart rate. In the presence of high-dose propranolol (30 mg/kg), high-dose leptin only reduced heart rate and sometimes caused sinus pauses and ventricular tachycardia. The leptin-induced inhibition of resting heart rate was fully reversed by leptin antagonist. Leptin also increased heart rate-corrected QT interval (QTc), and leptin antagonist did not. In isolated ventricular myocytes, leptin (0.03-0.3 μg/ml) reversibly increased the action potential duration. These results supported our hypothesis that in addition to indirect pathway via sympathetic tone, leptin can directly decrease heart rate and increase QT interval via its receptor independent of β-adrenergic receptor stimulation. During inhibition of β-adrenergic receptor activity, high concentration of leptin in myocardium can cause deep bradycardia, prolonged QT interval, and ventricular arrhythmias.
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Affiliation(s)
- Yen-Chang Lin
- Graduate Institute of Biotechnology, Chinese Culture University, Taipei, Taiwan
| | - Jianying Huang
- Center for Cardiovascular and Respiratory Sciences, Department of Physiology and Pharmacology, and
| | | | - Karen H Martin
- Mary Babb Randolph Cancer Center and Department of Neurobiology and Anatomy, Department of Cardiology and Heart Institute of Health Sciences Center, and
| | - Robert Hull
- Heart Institute, West Virginia University, Morgantown, West Virginia
| | - Mary Davis
- Department of Physiology and Pharmacology, and
| | - Han-Gang Yu
- Center for Cardiovascular and Respiratory Sciences, Department of Physiology and Pharmacology, and
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PP2 Prevents Isoproterenol Stimulation of Cardiac Pacemaker Activity. J Cardiovasc Pharmacol 2015. [DOI: 10.1097/01.fjc.0000464892.61748.a6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register]
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9
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PP2 Prevents Isoproterenol Stimulation of Cardiac Pacemaker Activity. J Cardiovasc Pharmacol 2015. [DOI: 10.1097/01.fjc.0000461685.26610.ba] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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