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Cooper TJ, Cleland JG, Guazzi M, Pellicori P, Ben Gal T, Amir O, Al-Mohammad A, Clark AL, McConnachie A, Steine K, Dickstein K. Effects of sildenafil on symptoms and exercise capacity for heart failure with reduced ejection fraction and pulmonary hypertension (The SilHF study): A randomised placebo-controlled multicentre trial. Eur J Heart Fail 2022; 24:1239-1248. [PMID: 35596935 PMCID: PMC9544113 DOI: 10.1002/ejhf.2527] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 04/26/2022] [Accepted: 04/30/2022] [Indexed: 11/25/2022] Open
Abstract
Aims Pulmonary hypertension (PHT) may complicate heart failure with reduced ejection fraction (HFrEF) and is associated with a substantial symptom burden and poor prognosis. Sildenafil, a phosphodiesterase‐5 (PDE‐5) inhibitor, might have beneficial effects on pulmonary haemodynamics, cardiac function and exercise capacity in HFrEF and PHT. The aim of this study was to determine the safety, tolerability, and efficacy of sildenafil in patients with HFrEF and indirect evidence of PHT. Methods and results The Sildenafil in Heart Failure (SilHF) trial was an investigator‐led, randomized, multinational trial in which patients with HFrEF and a pulmonary artery systolic pressure (PASP) ≥40 mmHg by echocardiography were randomly assigned in a 2:1 ratio to receive sildenafil (up to 40 mg three times/day) or placebo. The co‐primary endpoints were improvement in patient global assessment by visual analogue scale and in the 6‐min walk test at 24 weeks. The planned sample size was 210 participants but, due to problems with supplying sildenafil/placebo and recruitment, only 69 patients (11 women, median age 68 (interquartile range [IQR] 62–74) years, median left ventricular ejection fraction 29% (IQR 24–35), median PASP 45 (IQR 42–55) mmHg) were included. Compared to placebo, sildenafil did not improve symptoms, quality of life, PASP or walk test distance. Sildenafil was generally well tolerated, but those assigned to sildenafil had numerically more serious adverse events (33% vs. 21%). Conclusion Compared to placebo, sildenafil did not improve symptoms, quality of life or exercise capacity in patients with HFrEF and PHT.
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Affiliation(s)
| | - John Gf Cleland
- National Heart Lung Institute, Imperial College, London, UK.,Robertson Centre for Biostatistics and Glasgow Clinical Trials Unit, University of Glasgow, University Avenue, Glasgow, UK
| | - Marco Guazzi
- Cardiology Department, University of Milano, San Paolo Hospital, Milan, Italy
| | - Pierpaolo Pellicori
- Robertson Centre for Biostatistics and Glasgow Clinical Trials Unit, University of Glasgow, University Avenue, Glasgow, UK
| | - Tuvia Ben Gal
- Heart Failure Unit, Cardiology department, Rabin Medical Center, Petah Tikva and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Offer Amir
- Division of Cardiology, Hadassah Medical Center, Faculty of Medicine, Hebrew University Jerusalem Israel & Azrieli Faculty of Medicine, Bar-Ilan University, Zfat, Israel
| | - Abdallah Al-Mohammad
- Cardiology Department, Sheffield Teaching Hospital, NHS Foundation Trust, Sheffield, UK
| | - Andrew L Clark
- Hull University Teaching Hospitals NHS Trust, Castle Hill Hospital, Cottingham, UK
| | - Alex McConnachie
- Robertson Centre for Biostatistics and Glasgow Clinical Trials Unit, University of Glasgow, University Avenue, Glasgow, UK
| | - Kjetil Steine
- Department of Cardiology, Akershus University Hospital, Oslo, Norway
| | - Kenneth Dickstein
- University of Bergen, Stavanger University Hospital, Stavanger, Norway
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2
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Garcia-Gonzalez MA, Vallejo-Ruiz V, Atonal-Flores F, Flores-Hernandez J, Torres-Ramírez O, Diaz-Fonsecae A, Perez Vizcaino F, Lopez-Lopez JG. Sildenafil prevents right ventricular hypertrophy and improves heart rate variability in rats with pulmonary hypertension secondary to experimental diabetes. Clin Exp Hypertens 2022; 44:355-365. [DOI: 10.1080/10641963.2022.2050743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Miguel Angel Garcia-Gonzalez
- Departamento de Farmacia, Benemerita Universidad Autonoma de Puebla, Laboratorio de Farmacia Clinica, Edificio FCQ10, Ciudad Universitaria, Col. Jardines de San Manuel, Puebla, Mexico
| | - Veronica Vallejo-Ruiz
- Instituto Mexicano del Seguro Social, Centro de Investigación Biomédica de Oriente, Laboratorio de Biología Molecular, Puebla, Mexico
| | - Fausto Atonal-Flores
- Departamento de Fisiología, Benemérita Universidad Autónoma de Puebla, Facultad de Medicina, Metepec, Mexico
| | - Jorge Flores-Hernandez
- Laboratorio de Neuromodulación, Benemerita Universidad Autonoma de Puebla, Fisiología, Puebla,Mexico
| | - Oswaldo Torres-Ramírez
- Departamento de Farmacia, Benemérita Universidad Autónoma de Puebla, Facultad de Ciencias Químicas, Puebla, Mexico
| | - Alfonso Diaz-Fonsecae
- Departamento de Farmacia, Benemérita Universidad Autónoma de Puebla, Facultad de Ciencias Químicas, Puebla, Mexico
| | - Francisco Perez Vizcaino
- Departamento de Farmacología y Toxicología, Universidad Complutense de Madrid, Escuela de Medicina, Puebla,Mexico
| | - Jose Gustavo Lopez-Lopez
- Departamento de Farmacia, Benemerita Universidad Autonoma de Puebla, Laboratorio de Farmacia Clinica, Edificio FCQ10, Ciudad Universitaria, Col. Jardines de San Manuel, Puebla, Mexico
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Melillo E, Masarone D, Oh JK, Verrengia M, Valente F, Vastarella R, Ammendola E, Pacileo R, Pacileo G. Echocardiography in Advanced Heart Failure for Diagnosis, Management, and Prognosis. Heart Fail Clin 2021; 17:547-560. [PMID: 34511204 DOI: 10.1016/j.hfc.2021.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Advanced heart failure, an end-stage disease characterized by high mortality and morbidity despite standard medical therapy, requires various therapeutic strategies like heart transplant and long-term mechanical circulatory support. Echocardiography is the main imaging technique to identify transitions to advanced stages of disease and guide risk stratification and therapeutic decision-making processes. Progressive development of advanced echocardiographic techniques allows more comprehensive assessment of the hemodynamic and structural profiles of patients with advanced heart failure, and its use in clinical practice continues to expand. This article provides an overview of basic and emerging echocardiographic tools to assess patients with advanced heart failure.
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Affiliation(s)
- Enrico Melillo
- Heart Failure Unit, AORN dei Colli, Monaldi Hospital, Naples, Italy.
| | - Daniele Masarone
- Heart Failure Unit, AORN dei Colli, Monaldi Hospital, Naples, Italy
| | - Jae K Oh
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Marina Verrengia
- Heart Failure Unit, AORN dei Colli, Monaldi Hospital, Naples, Italy
| | - Fabio Valente
- Heart Failure Unit, AORN dei Colli, Monaldi Hospital, Naples, Italy
| | | | | | - Roberta Pacileo
- Heart Failure Unit, AORN dei Colli, Monaldi Hospital, Naples, Italy
| | - Giuseppe Pacileo
- Heart Failure Unit, AORN dei Colli, Monaldi Hospital, Naples, Italy
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Ravi Y, Sai-Sudhakar CB, Kuppusamy P. PTEN as a Therapeutic Target in Pulmonary Hypertension Secondary to Left-heart Failure: Effect of HO-3867 and Supplemental Oxygenation. Cell Biochem Biophys 2021; 79:593-607. [PMID: 34133009 DOI: 10.1007/s12013-021-01010-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/31/2021] [Indexed: 01/27/2023]
Abstract
Pulmonary hypertension (PH) is a condition when the pressure in the lung blood vessels is elevated. This leads to increase in thickness of the blood vessels and increases the workload of the heart and lungs. The incidence and prevalence of PH has been on the increase in the last decade. It is estimated that PH affects about 1% of the global population and about 10% of individuals >65 years of age. Of the various types, Group 2 PH is the most common type seen in the elderly population. Fixed PH or PH refractive to therapies is considered a contraindication for heart transplantation; the 30-day mortality in heart transplant recipients is significantly increased in the subset of this population. In general, the pathobiology of PH involves multiple factors including hypoxia, oxidative stress, growth factor receptors, vascular stress, etc. Hence, it is challenging and important to identify specific mechanisms, diagnosis and develop effective therapeutic strategies. The focus of this manuscript is to review some of the important pathobiological processes and mechanisms in the development of PH. Results from our previously reported studies, including targeted treatments along with some new data on PH secondary to left-heart failure, are presented.
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Affiliation(s)
- Yazhini Ravi
- Department of Surgery, University of Tennessee Health Science Center, Memphis, TN, USA
| | | | - Periannan Kuppusamy
- Departments of Radiology and Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA.
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Long-Chain Acylcarnitines and Monounsaturated Fatty Acids Discriminate Heart Failure Patients According to Pulmonary Hypertension Status. Metabolites 2021; 11:metabo11040196. [PMID: 33810372 PMCID: PMC8066759 DOI: 10.3390/metabo11040196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 11/17/2022] Open
Abstract
Defects in fatty acid (FA) utilization have been well described in group 1 pulmonary hypertension (PH) and in heart failure (HF), yet poorly studied in group 2 PH. This study was to assess whether the metabolomic profile of patients with pulmonary hypertension (PH) due HF, classified as group 2 PH, differs from those without PH. We conducted a proof-of-principle cross-sectional analysis of 60 patients with chronic HF with reduced ejection fraction and 72 healthy controls in which the circulating level of 71 energy-related metabolites was measured using various methods. Echocardiography was used to classify HF patients as noPH-HF (n = 27; mean pulmonary artery pressure [mPAP] 21 mmHg) and PH-HF (n = 33; mPAP 35 mmHg). The profile of circulating metabolites among groups was compared using principal component analysis (PCA), analysis of covariance (ANCOVA), and Pearson’s correlation tests. Patients with noPH-HF and PH-HF were aged 64 ± 11 and 68 ± 10 years, respectively, with baseline left ventricular ejection fractions of 27 ± 7% and 26 ± 7%. Principal component analysis segregated groups, more markedly for PH-HF, with long-chain acylcarnitines, acetylcarnitine, and monounsaturated FA carrying the highest loading scores. After adjustment for age, sex, kidney function, insulin resistance, and N-terminal pro-brain natriuretic peptide (NT-proBNP), 5/15 and 8/15 lipid-related metabolite levels were significantly different from controls in noPH-HF and PH-HF subjects, respectively. All metabolites for which circulating levels interacted between group and NT-proBNP significantly correlated with NT-proBNP in HF-PH, but none with HF-noPH. FA-related metabolites were differently affected in HF with or without PH, and may convey adverse outcomes given their distinct correlation with NT-proBNP in the setting of PH.
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Palmiero G, Melillo E, Ferro A, Carlomagno G, Sordelli C, Ascione R, Monda V, Severino S, Ascione L, Caso P. Significant functional mitral regurgitation affects left atrial function in heart failure patients: haemodynamic correlations and prognostic implications. Eur Heart J Cardiovasc Imaging 2020; 20:1012-1019. [PMID: 30863840 DOI: 10.1093/ehjci/jez036] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 12/17/2018] [Accepted: 02/19/2019] [Indexed: 12/22/2022] Open
Abstract
AIMS Functional mitral regurgitation (FMR) is a well-known pathophysiological factor in heart failure (HF) patients, and left atrial function (LAF) is a novel determinant of clinical status and outcome in this setting. However, little is known about the pathophysiological role of FMR on LAF in HFrEF patients. Aim of this study is to explore the possible interplay between the severity of FMR and LAF in heart failure with reduce ejection fraction (HFrEF) patients and their possible consequences. METHODS AND RESULTS We studied 97 consecutive patients with FMR classified in two groups: mild-to-moderate MR ore less (FMR group, n = 38) and moderate-to-severe or more (SFMR group, n = 59). Using the phasic method, left atrial contractile, conduit, reservoir, and total emptying function (TLAEF) were calculated to assess LAF. SFMR group showed significantly lower values of LAF compared to FMR group. LA dysfunction (LA-dys) was defined for TLAEF values below the median and groups divided in four subgroups based on its presence. Patient with LA-Dys in SFMR group showed a worse clinical status, higher incidence of right ventricular dysfunction (RV-Dys), and pulmonary hypertension (PH), and a significant worse clinical survival compared to all other groups. CONCLUSION In our study, the survival was significantly lower in SFMR/LA-Dys+ group. Furthermore, LA-Dys was strongly related with worse clinical status and higher incidence of PH and RV-Dys. These results suggest that in patients with SFMR and HFrEF, LA-Dys may represent both a marker of more advanced disease and a novel prognostic factor.
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Affiliation(s)
- Giuseppe Palmiero
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Enrico Melillo
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Adele Ferro
- Institute of Biostructure and Bioimaging, National Council of Research (CNR), Naples, Italy
| | - Guido Carlomagno
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Chiara Sordelli
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Raffaele Ascione
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Vittorio Monda
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Sergio Severino
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Luigi Ascione
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
| | - Pio Caso
- Department of Cardiology, AORN Ospedali dei Colli-Monaldi, Naples, Italy
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Dianat M, Radan M, Mard SA, Sohrabi F, Saryazdi SSN. Contribution of reactive oxygen species via the OXR1 signaling pathway in the pathogenesis of monocrotaline-induced pulmonary arterial hypertension: The protective role of Crocin. Life Sci 2020; 256:117848. [DOI: 10.1016/j.lfs.2020.117848] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/16/2020] [Accepted: 05/23/2020] [Indexed: 12/19/2022]
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8
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A right ventricular state of mind in the progression of heart failure with reduced ejection fraction: implications for left ventricular assist device therapy. Heart Fail Rev 2020; 26:1467-1475. [DOI: 10.1007/s10741-020-09935-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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9
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Meng Q, Guo Y, Zhang D, Zhang Q, Li Y, Bian H. Tongsaimai reverses the hypertension and left ventricular remolding caused by abdominal aortic constriction in rats. JOURNAL OF ETHNOPHARMACOLOGY 2020; 246:112154. [PMID: 31415848 DOI: 10.1016/j.jep.2019.112154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 08/01/2019] [Accepted: 08/10/2019] [Indexed: 06/10/2023]
Abstract
Treating ventricular remodeling continues to be a clinical challenge. Studies have shown that hypertension is one of the most common causes of ventricular remodeling, and is a major cause of cardiovascular risk in adults. Here, we report that Tongsaimai (TSM), a Chinese traditional medicine, could inhibit arterial pressure and left ventricular pressure to improve hemodynamic abnormalities in rats impaired by abdominal aortic constriction (AAC). Administration of TSM significantly reduced the heart mass index and the left ventricular mass index significantly in AAC rats. TSM could also markedly ameliorate cardiac collagen deposition and reduce the concentration of hydroxyproline in the heart of AAC rats. Moreover, TSM alleviated cardiac histomorphology injury resulting from AAC, including reducing cardiomyocyte hypertrophy, fibrous connective tissue hyperplasia, cardiomyocyte apoptosis, replacement fibrosis and the disorders of myocardial myofibrils, intercalated discs, mitochondria and mitochondrial crista. In addition, the levels of transforming growth factor (TGF) - β and inflammation-related molecules including tumor necrosis factor-α (TNF-α), which were over-expressed with AAC, were decreased by STM. In conclusion, STM could reverse the hypertension and left ventricular remolding caused by abdominal aortic constriction in rats.
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Affiliation(s)
- Qinghai Meng
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, 210023, China.
| | - Yao Guo
- Nanjing TechBoon Biotechnology Company Limited, Nanjing, Jiangsu, 211899, China.
| | - Dini Zhang
- Department of Environmental Protection, Nanjing Institute of Environmental Sciences, Nanjing, Jiangsu, 210042, China.
| | - Qichun Zhang
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, 210023, China.
| | - Yu Li
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, 210023, China.
| | - Huimin Bian
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, 210023, China.
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10
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Fischer-Rasokat U, Renker M, Liebetrau C, Weferling M, Rolf A, Doss M, Möllmann H, Walther T, Hamm CW, Kim WK. Outcome of patients with heart failure after transcatheter aortic valve implantation. PLoS One 2019; 14:e0225473. [PMID: 31770401 PMCID: PMC6879149 DOI: 10.1371/journal.pone.0225473] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 11/04/2019] [Indexed: 12/12/2022] Open
Abstract
AIMS Patients with aortic stenosis (AS) may have concomitant heart failure (HF) that determines prognosis despite successful transcatheter aortic valve implantation (TAVI). We compared outcomes of TAVI patients with low stroke volume index (SVI) ≤35 ml/m2 body surface area in different HF classes. METHODS AND RESULTS Patients treated by transfemoral TAVI at our center (n = 1822) were classified as 1) 'HF with preserved ejection fraction (EF)' (HFpEF, EF ≥50%), 2) 'HF with mid-range EF' (HFmrEF, EF 40-49%), or 3) 'HF with reduced EF' (HFrEF, EF <40%). Patients with SVI >35 ml/m2 served as controls. The prevalence of cardiovascular disease and symptoms increased stepwise from controls (n = 968) to patients with HFpEF (n = 591), HFmrEF (n = 97), and HFrEF (n = 166). Mortality tended to be highest in HFrEF patients 30 days post-procedure, and it became significant after one year: 10.2% (controls), 13.5% (HFpEF), 13.4% (HFmrEF), and 23.5% (HFrEF). However, symptomatic improvement in survivors of all groups was achieved in the majority of patients without differences among groups. CONCLUSIONS Patients with AS and HF benefit from TAVI with respect to symptom alleviation. TAVI in patients with HFpEF and HFmrEF led to an identical, favorable post-procedural prognosis that was significantly better than that of patients with HFrEF, which remains a high-risk population.
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Affiliation(s)
- Ulrich Fischer-Rasokat
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
- Department of Cardiology and Angiology, Medical Clinic I, University Hospital of Giessen, Giessen, Germany
- * E-mail:
| | - Matthias Renker
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
- Department of Cardiac Surgery, Kerckhoff Heart Center, Bad Nauheim, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site RheinMain, Bad Nauheim, Germany
| | - Christoph Liebetrau
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
- Department of Cardiology and Angiology, Medical Clinic I, University Hospital of Giessen, Giessen, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site RheinMain, Bad Nauheim, Germany
| | - Maren Weferling
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
| | - Andreas Rolf
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
- Department of Cardiology and Angiology, Medical Clinic I, University Hospital of Giessen, Giessen, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site RheinMain, Bad Nauheim, Germany
| | - Mirko Doss
- Department of Cardiac Surgery, Kerckhoff Heart Center, Bad Nauheim, Germany
| | - Helge Möllmann
- Department of Cardiology, Medical Clinic I, St. Johannes Hospital, Dortmund, Germany
| | - Thomas Walther
- Department of Cardiac Surgery, Kerckhoff Heart Center, Bad Nauheim, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site RheinMain, Bad Nauheim, Germany
- Department of Cardiac, Thoracic and Thoracic Vascular Surgery, University Hospital of the Goethe University, Frankfurt/Main, Germany
| | - Christian W. Hamm
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
- Department of Cardiology and Angiology, Medical Clinic I, University Hospital of Giessen, Giessen, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site RheinMain, Bad Nauheim, Germany
| | - Won-Keun Kim
- Department of Cardiology, Kerckhoff Heart Center, Bad Nauheim, Germany
- Department of Cardiology and Angiology, Medical Clinic I, University Hospital of Giessen, Giessen, Germany
- Department of Cardiac Surgery, Kerckhoff Heart Center, Bad Nauheim, Germany
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Pedersen SF, Counillon L. The SLC9A-C Mammalian Na +/H + Exchanger Family: Molecules, Mechanisms, and Physiology. Physiol Rev 2019; 99:2015-2113. [PMID: 31507243 DOI: 10.1152/physrev.00028.2018] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Na+/H+ exchangers play pivotal roles in the control of cell and tissue pH by mediating the electroneutral exchange of Na+ and H+ across cellular membranes. They belong to an ancient family of highly evolutionarily conserved proteins, and they play essential physiological roles in all phyla. In this review, we focus on the mammalian Na+/H+ exchangers (NHEs), the solute carrier (SLC) 9 family. This family of electroneutral transporters constitutes three branches: SLC9A, -B, and -C. Within these, each isoform exhibits distinct tissue expression profiles, regulation, and physiological roles. Some of these transporters are highly studied, with hundreds of original articles, and some are still only rudimentarily understood. In this review, we present and discuss the pioneering original work as well as the current state-of-the-art research on mammalian NHEs. We aim to provide the reader with a comprehensive view of core knowledge and recent insights into each family member, from gene organization over protein structure and regulation to physiological and pathophysiological roles. Particular attention is given to the integrated physiology of NHEs in the main organ systems. We provide several novel analyses and useful overviews, and we pinpoint main remaining enigmas, which we hope will inspire novel research on these highly versatile proteins.
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Affiliation(s)
- S F Pedersen
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark; and Université Côte d'Azur, CNRS, Laboratoire de Physiomédecine Moléculaire, LP2M, France, and Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
| | - L Counillon
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Copenhagen, Denmark; and Université Côte d'Azur, CNRS, Laboratoire de Physiomédecine Moléculaire, LP2M, France, and Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
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