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Liu D, Song AT, Qi X, van Vliet PP, Xiao J, Xiong F, Andelfinger G, Nattel S. Cohesin-protein Shugoshin-1 controls cardiac automaticity via HCN4 pacemaker channel. Nat Commun 2021; 12:2551. [PMID: 33953173 PMCID: PMC8100125 DOI: 10.1038/s41467-021-22737-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 03/16/2021] [Indexed: 12/12/2022] Open
Abstract
Endogenous cardiac pacemaker function regulates the rate and rhythm of cardiac contraction. The mutation p.Lys23Glu in the cohesin protein Shugoshin-1 causes severe heart arrhythmias due to sinoatrial node dysfunction and a debilitating gastrointestinal motility disorder, collectively termed the Chronic Atrial and Intestinal Dysrhythmia Syndrome, linking Shugoshin-1 and pacemaker activity. Hyperpolarization-activated, cyclic nucleotide-gated cation channel 4 (HCN4) is the predominant pacemaker ion-channel in the adult heart and carries the majority of the "funny" current, which strongly contributes to diastolic depolarization in pacemaker cells. Here, we study the mechanism by which Shugoshin-1 affects cardiac pacing activity with two cell models: neonatal rat ventricular myocytes and Chronic Atrial and Intestinal Dysrhythmia Syndrome patient-specific human induced pluripotent stem cell derived cardiomyocytes. We find that Shugoshin-1 interacts directly with HCN4 to promote and stabilize cardiac pacing. This interaction enhances funny-current by optimizing HCN4 cell-surface expression and function. The clinical p.Lys23Glu mutation leads to an impairment in the interaction between Shugoshin-1 and HCN4, along with depressed funny-current and dysrhythmic activity in induced pluripotent stem cell derived cardiomyocytes derived from Chronic Atrial and Intestinal Dysrhythmia Syndrome patients. Our work reveals a critical non-canonical, cohesin-independent role for Shugoshin-1 in maintaining cardiac automaticity and identifies potential therapeutic avenues for cardiac pacemaking disorders, in particular Chronic Atrial and Intestinal Dysrhythmia Syndrome.
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Affiliation(s)
- Donghai Liu
- Montreal Heart Institute, Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Andrew Taehun Song
- Department of Anatomy and Cell Biology, McGill University, Montréal, QC, Canada
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine Research Centre, University of Montreal, Montréal, QC, Canada
| | - Xiaoyan Qi
- Montreal Heart Institute, Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Patrick Piet van Vliet
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine Research Centre, University of Montreal, Montréal, QC, Canada
- LIA (International Associated Laboratory) INSERM, Marseille, France
- LIA (International Associated Laboratory) Centre Hospitalier Universitaire Sainte-Justine, Montréal, QC, Canada
| | - Jiening Xiao
- Montreal Heart Institute, Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Feng Xiong
- Montreal Heart Institute, Department of Medicine, Université de Montréal, Montréal, QC, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada
| | - Gregor Andelfinger
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte-Justine Research Centre, University of Montreal, Montréal, QC, Canada
- Department of Pediatrics, University of Montreal, Montréal, QC, Canada
- Department of Biochemistry, University of Montreal, Montréal, QC, Canada
| | - Stanley Nattel
- Montreal Heart Institute, Department of Medicine, Université de Montréal, Montréal, QC, Canada.
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC, Canada.
- Institute of Pharmacology, West German Heart and Vascular Center, Faculty of Medicine, University Duisburg-Essen, Essen, Germany.
- IHU LIRYC Institute, Fondation Bordeaux Université, Bordeaux, France.
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