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Matsumoto K, Luther KB, Haltiwanger RS. Analysis of endogenous NOTCH1 from POFUT1 S162L patient fibroblasts reveals the importance of the O -fucose modification on EGF12 in human development. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.09.588484. [PMID: 38645096 PMCID: PMC11030454 DOI: 10.1101/2024.04.09.588484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
NOTCH1 (N1) is a transmembrane receptor interacting with membrane-tethered ligands on opposing cells that mediate the direct cell-cell interaction necessary for many cell fate decisions. Protein O -fucosyltransferase 1 (POFUT1) adds O -fucose to Epidermal Growth Factor (EGF)-like repeats in the NOTCH1 extracellular domain, which is required for trafficking and signaling activation. We previously showed that POFUT1 S162L caused a 90% loss of POFUT1 activity and global developmental defects in a patient; however, the mechanism by which POFUT1 contributes to these symptoms is still unclear. Compared to controls, POFUT1 S162L patient fibroblast cells had an equivalent amount of N1 on the cell surface but showed a 60% reduction of DLL1 ligand binding and a 70% reduction in JAG1 ligand binding. To determine if the reduction of O -fucose on N1 in POFUT1 S162L patient fibroblasts was the cause of these effects, we immunopurified endogenous N1 from control and patient fibroblasts and analyzed O -fucosylation using mass spectral glycoproteomics methods. N1 EGF8 to EGF12 comprise the ligand binding domain, and O -fucose on EGF8 and EGF12 physically interact with ligands to enhance affinity. Glycoproteomics of N1 from POFUT1 S162L patient fibroblasts showed WT fucosylation levels at all sites analyzed except for a large decrease at EGF9 and the complete absence of O -fucose at EGF12. Since the loss of O -fucose on EGF12 is known to have significant effects on N1 activity, this may explain the symptoms observed in the POFUT1 S162L patient.
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Zhang X, Cui S, Ding Y, Li Y, Wu B, Gao J, Li M, Xu L, Xia H. Downregulation of B4GALT5 attenuates cardiac fibrosis through Lumican and Akt/GSK-3β/β-catenin pathway. Eur J Pharmacol 2024; 963:176263. [PMID: 38081351 DOI: 10.1016/j.ejphar.2023.176263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 11/30/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
Virtually all forms of cardiac disease exhibit cardiac fibrosis as a common trait, which ultimately leads to adverse ventricular remodeling and heart failure. To improve the prognosis of heart disease, it is crucial to halt the progression of cardiac fibrosis. Protein function is intricately linked with protein glycosylation, a vital post-translational modification. As a fundamental member of the β1,4-galactosyltransferase gene family (B4GALT), β1,4-galactosyltransferase V (B4GALT5) is associated with various disorders. In this study, significant levels of B4GALT5 expression were observed in cardiac fibrosis induced by transverse aortic constriction (TAC) or TGFβ1 and the activation of cardiac fibroblasts (CFs). Subsequently, by administering AAV9-shB4GALT5 injections to TAC animals, we were able to demonstrate that in vivo B4GALT5 knockdown decreased the transformation of CFs into myofibroblasts (myoFBs) and reduced the deposition of cardiac collagen fibers. In vitro tests revealed the same results. Conversely, both in vivo and in vitro experiments indicated that overexpression of B4GALT5 stimulates CFs activation and exacerbates cardiac fibrosis. Initially, we elucidated the primary mechanism by which B4GALT5 regulates the Akt/GSK-3β/β-catenin pathway and directly interacts with laminin, thereby affecting cardiac fibrosis. Our findings demonstrate that B4GALT5 promotes cardiac fibrosis through the Akt/GSK-3β/β-catenin pathway and reveal laminin as the target protein of B4GALT5.
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Affiliation(s)
- Xutao Zhang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, China
| | - Shengyu Cui
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, China
| | - Yuewen Ding
- Department of Anesthesiology, Medical Center of Anesthesiology and Pain, The First Affiliated Hospital of Nanchang University, China
| | - Yuhua Li
- Intensive Care Unit, Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
| | - Bing Wu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, China
| | - Jixian Gao
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, China
| | - Ming Li
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, China
| | - Lin Xu
- Department of Geriatrics, Renmin Hospital of Wuhan University, Wuhan, Hubei, 430060, China.
| | - Hao Xia
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, China.
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Dong XL, Yuan BH, Yu SZ, Liu H, Pan XH, Sun J, Pan LL. Adriamycin induces cardiac fibrosis in mice via PRMT5-mediated cardiac fibroblast activation. Acta Pharmacol Sin 2023; 44:573-583. [PMID: 36056082 PMCID: PMC9958096 DOI: 10.1038/s41401-022-00963-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 07/21/2022] [Indexed: 11/08/2022] Open
Abstract
Long-term treatment with adriamycin (ADR) is associated with higher incidences of cumulative cardiotoxicity manifest as heart failure. ADR-induced cardiomyopathy is characterized by extensive fibrosis that is caused by cardiac fibroblast activation. To date, however, no specific treatment is available to alleviate ADR-induced cardiotoxicity. Protein arginine methyltransferase 5 (PRMT5), a major enzyme responsible for methylation of arginine, regulates numerous cellular processes such as cell differentiation. In the present study we investigated the role of PRMT5 in cardiac fibrosis. Mice were administered ADR (3 mg/kg, i.p., every 2 days) for 2 weeks. We showed that aberrant PRMT5 expression was largely co-localized with α-SMA-positive activated cardiac fibroblasts in ADR-injected mice and in ADR-treated cardiac fibroblasts in vitro. PRMT5-overexpression exacerbated, whereas PRMT5 knockdown alleviated ADR-induced cardiac fibrosis in vivo and TGF-β1-induced cardiac fibroblast activation in vitro. We demonstrated that PRMT5-overexpression enhanced methylated-Smad3 levels in vivo and in vitro. Pretreatment with a specific PRMT5 inhibitor EPZ015666 (5 nM) or overexpression of a catalytically inactive mutant of PRMT5, PRMT5(E444Q), reduced PRMT5-induced methylation of Smad3, thus suppressing PRMT5-mediated cardiac fibroblast activation in vitro. Furthermore, ADR activated cardiac fibroblasts was depending on autocrine TGF-β1. Taken together, our results demonstrate that PRMT5 promotes ADR-induced cardiac fibrosis via activating cardiac fibroblasts, suggesting that it may be a potential therapeutic target of ADR-caused cardiotoxicity.
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Affiliation(s)
- Xiao-Liang Dong
- Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China
| | - Bao-Hui Yuan
- School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, China
| | - Sheng-Zhou Yu
- Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China
| | - He Liu
- School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, China
| | - Xiao-Hua Pan
- School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, China
| | - Jia Sun
- School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China.
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, China.
| | - Li-Long Pan
- Wuxi School of Medicine, Jiangnan University, Wuxi, 214122, China.
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Picchio V, Floris E, Derevyanchuk Y, Cozzolino C, Messina E, Pagano F, Chimenti I, Gaetani R. Multicellular 3D Models for the Study of Cardiac Fibrosis. Int J Mol Sci 2022; 23:ijms231911642. [PMID: 36232943 PMCID: PMC9569892 DOI: 10.3390/ijms231911642] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/19/2022] [Accepted: 09/27/2022] [Indexed: 11/06/2022] Open
Abstract
Ex vivo modelling systems for cardiovascular research are becoming increasingly important in reducing lab animal use and boosting personalized medicine approaches. Integrating multiple cell types in complex setups adds a higher level of significance to the models, simulating the intricate intercellular communication of the microenvironment in vivo. Cardiac fibrosis represents a key pathogenetic step in multiple cardiovascular diseases, such as ischemic and diabetic cardiomyopathies. Indeed, allowing inter-cellular interactions between cardiac stromal cells, endothelial cells, cardiomyocytes, and/or immune cells in dedicated systems could make ex vivo models of cardiac fibrosis even more relevant. Moreover, culture systems with 3D architectures further enrich the physiological significance of such in vitro models. In this review, we provide a summary of the multicellular 3D models for the study of cardiac fibrosis described in the literature, such as spontaneous microtissues, bioprinted constructs, engineered tissues, and organs-on-chip, discussing their advantages and limitations. Important discoveries on the physiopathology of cardiac fibrosis, as well as the screening of novel potential therapeutic molecules, have been reported thanks to these systems. Future developments will certainly increase their translational impact for understanding and modulating mechanisms of cardiac fibrosis even further.
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Affiliation(s)
- Vittorio Picchio
- Department of Medical Surgical Sciences and Biotechnologies, Sapienza University, 04100 Latina, Italy
| | - Erica Floris
- Department of Medical Surgical Sciences and Biotechnologies, Sapienza University, 04100 Latina, Italy
| | - Yuriy Derevyanchuk
- Department of Molecular Medicine, Sapienza University, 00161 Rome, Italy
| | - Claudia Cozzolino
- Department of Medical Surgical Sciences and Biotechnologies, Sapienza University, 04100 Latina, Italy
| | - Elisa Messina
- Department of Molecular Medicine, Sapienza University, 00161 Rome, Italy
| | - Francesca Pagano
- Institute of Biochemistry and Cell Biology, National Council of Research (IBBC-CNR), 00015 Monterotondo, Italy
| | - Isotta Chimenti
- Department of Medical Surgical Sciences and Biotechnologies, Sapienza University, 04100 Latina, Italy
- Mediterranea Cardiocentro, 80122 Napoli, Italy
- Correspondence: ; Tel.: +39-077-3175-7234
| | - Roberto Gaetani
- Department of Molecular Medicine, Sapienza University, 00161 Rome, Italy
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Xu Y, Qi J, Zhou W, Liu X, Zhang L, Yao X, Wu H. Generation of ring-shaped human iPSC-derived functional heart microtissues in a Möbius strip configuration. Biodes Manuf 2022. [DOI: 10.1007/s42242-022-00204-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AbstractAlthough human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) have been used for disease modeling and drug discovery, clinically relevant three-dimensional (3D) functional myocardial microtissues are lacking. Here, we developed a novel ring-shaped cardiac microtissue comprised of chamber-specific tissues to achieve a geometrically non-orientable ventricular myocardial band, similar to a Möbius loop. The ring-shaped cardiac tissue was constructed of hiPSC-CMs and human cardiac fibroblasts (hCFs) through a facile cellular self-assembly approach. It exhibited basic anatomical structure, positive cardiac troponin T (cTnT) immunostaining, regular calcium transients, and cardiac-like mechanical strength. The cardiac rings can be self-assembled and scaled up into various sizes with outstanding stability, suggesting their potential for precise therapy, pathophysiological investigation, and large-scale drug screening.
Graphic abstract
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Xuan Y, Chen C, Wen Z, Wang DW. The Roles of Cardiac Fibroblasts and Endothelial Cells in Myocarditis. Front Cardiovasc Med 2022; 9:882027. [PMID: 35463742 PMCID: PMC9022788 DOI: 10.3389/fcvm.2022.882027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 03/16/2022] [Indexed: 11/13/2022] Open
Abstract
In myocarditis caused by various etiologies, activated immune cells and the immune regulatory factors released by them play important roles. But in this complex microenvironment, non-immune cells and non-cardiomyocytes in the heart, such as cardiomyocytes (CMs), cardiac fibroblasts (CFs) and endothelial cells (ECs), play the role of “sentinel”, amplify inflammation, and interact with the cardiomyocytes. The complex interactions between them are rarely paid attention to. This review will re-examine the functions of CFs and ECs in the pathological conditions of myocarditis and their direct and indirect interactions with CMs, in order to have a more comprehensive understanding of the pathogenesis of myocarditis and better guide the drug development and clinical treatment of myocarditis.
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Affiliation(s)
- Yunling Xuan
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
| | - Chen Chen
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
| | - Zheng Wen
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
- *Correspondence: Zheng Wen
| | - Dao Wen Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Wuhan, China
- Dao Wen Wang
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Dunham CS, Mackenzie ME, Nakano H, Kim AR, Juda MB, Nakano A, Stieg AZ, Gimzewski JK. Pacemaker translocations and power laws in 2D stem cell-derived cardiomyocyte cultures. PLoS One 2022; 17:e0263976. [PMID: 35286321 PMCID: PMC8920264 DOI: 10.1371/journal.pone.0263976] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 02/01/2022] [Indexed: 11/18/2022] Open
Abstract
Power laws are of interest to several scientific disciplines because they can provide important information about the underlying dynamics (e.g. scale invariance and self-similarity) of a given system. Because power laws are of increasing interest to the cardiac sciences as potential indicators of cardiac dysfunction, it is essential that rigorous, standardized analytical methods are employed in the evaluation of power laws. This study compares the methods currently used in the fields of condensed matter physics, geoscience, neuroscience, and cardiology in order to provide a robust analytical framework for evaluating power laws in stem cell-derived cardiomyocyte cultures. One potential power law-obeying phenomenon observed in these cultures is pacemaker translocations, or the spatial and temporal instability of the pacemaker region, in a 2D cell culture. Power law analysis of translocation data was performed using increasingly rigorous methods in order to illustrate how differences in analytical robustness can result in misleading power law interpretations. Non-robust methods concluded that pacemaker translocations adhere to a power law while robust methods convincingly demonstrated that they obey a doubly truncated power law. The results of this study highlight the importance of employing comprehensive methods during power law analysis of cardiomyocyte cultures.
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Affiliation(s)
- Christopher S. Dunham
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, United States of America
| | - Madelynn E. Mackenzie
- Department of Microbiology, Immunology & Molecular Genetics, University of California, Los Angeles, California, United States of America
| | - Haruko Nakano
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, California, United States of America
| | - Alexis R. Kim
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, United States of America
| | - Michal B. Juda
- Molecular Biology Institute, University of California, Los Angeles, California, United States of America
| | - Atsushi Nakano
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, California, United States of America
- Molecular Biology Institute, University of California, Los Angeles, California, United States of America
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, California, United States of America
- Division of Cardiology, Department of Medicine, University of California, Los Angeles, California, United States of America
- Department of Cell Physiology, The Jikei University, Tokyo, Japan
| | - Adam Z. Stieg
- California NanoSystems Institute, University of California, Los Angeles, California, United States of America
- International Center for Materials Nanoarchitectonics (MANA), National Institute of Materials Science, Tsukuba, Japan
| | - James K. Gimzewski
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, United States of America
- California NanoSystems Institute, University of California, Los Angeles, California, United States of America
- International Center for Materials Nanoarchitectonics (MANA), National Institute of Materials Science, Tsukuba, Japan
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A Calibration-Free Measurement for Monitoring Cellular Calcium Transients Adaptively. Appl Biochem Biotechnol 2022; 194:2236-2250. [DOI: 10.1007/s12010-021-03771-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2021] [Indexed: 11/02/2022]
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Gomez AH, Joshi S, Yang Y, Tune JD, Zhao MT, Yang H. Bioengineering Systems for Modulating Notch Signaling in Cardiovascular Development, Disease, and Regeneration. J Cardiovasc Dev Dis 2021; 8:125. [PMID: 34677194 PMCID: PMC8541010 DOI: 10.3390/jcdd8100125] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/27/2021] [Accepted: 09/27/2021] [Indexed: 12/13/2022] Open
Abstract
The Notch intercellular signaling pathways play significant roles in cardiovascular development, disease, and regeneration through modulating cardiovascular cell specification, proliferation, differentiation, and morphogenesis. The dysregulation of Notch signaling leads to malfunction and maldevelopment of the cardiovascular system. Currently, most findings on Notch signaling rely on animal models and a few clinical studies, which significantly bottleneck the understanding of Notch signaling-associated human cardiovascular development and disease. Recent advances in the bioengineering systems and human pluripotent stem cell-derived cardiovascular cells pave the way to decipher the role of Notch signaling in cardiovascular-related cells (endothelial cells, cardiomyocytes, smooth muscle cells, fibroblasts, and immune cells), and intercellular crosstalk in the physiological, pathological, and regenerative context of the complex human cardiovascular system. In this review, we first summarize the significant roles of Notch signaling in individual cardiac cell types. We then cover the bioengineering systems of microfluidics, hydrogel, spheroid, and 3D bioprinting, which are currently being used for modeling and studying Notch signaling in the cardiovascular system. At last, we provide insights into ancillary supports of bioengineering systems, varied types of cardiovascular cells, and advanced characterization approaches in further refining Notch signaling in cardiovascular development, disease, and regeneration.
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Affiliation(s)
- Angello Huerta Gomez
- Department of Biomedical Engineering, University of North Texas, Denton, TX 76207, USA; (A.H.G.); (S.J.); (Y.Y.)
| | - Sanika Joshi
- Department of Biomedical Engineering, University of North Texas, Denton, TX 76207, USA; (A.H.G.); (S.J.); (Y.Y.)
- Texas Academy of Mathematics and Science, University of North Texas, Denton, TX 76201, USA
| | - Yong Yang
- Department of Biomedical Engineering, University of North Texas, Denton, TX 76207, USA; (A.H.G.); (S.J.); (Y.Y.)
| | - Johnathan D. Tune
- Department of Physiology & Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA;
| | - Ming-Tao Zhao
- Center for Cardiovascular Research, Abigail Wexner Research Institute, Nationwide Children’s Hospital, Columbus, OH 43215, USA;
- The Heart Center, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Huaxiao Yang
- Department of Biomedical Engineering, University of North Texas, Denton, TX 76207, USA; (A.H.G.); (S.J.); (Y.Y.)
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10
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Joviano-Santos JV, Santos-Miranda A, Neri EA, Fonseca-Alaniz MH, Krieger JE, Pereira AC, Roman-Campos D. SCN5A compound heterozygosity mutation in Brugada syndrome: Functional consequences and the implication for pharmacological treatment. Life Sci 2021; 278:119646. [PMID: 34048814 DOI: 10.1016/j.lfs.2021.119646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 05/13/2021] [Accepted: 05/18/2021] [Indexed: 11/28/2022]
Abstract
AIMS SCN5A gene encodes the α-subunit of Nav1.5, mainly found in the human heart. SCN5A variants are the most common genetic alterations associated with Brugada syndrome (BrS). In rare cases, compound heterozygosity is observed; however, its functional consequences are poorly understood. We aimed to analyze the functional impact of de novo Nav1.5 mutations in compound heterozygosity in distinct alleles (G400R and T1461S positions) previously found in a patient with BrS. Moreover, we evaluated the potential benefits of quinidine to improve the phenotype of mutant Na+ channels in vitro. MATERIALS AND METHODS The functional properties of human wild-type and Nav1.5 variants were evaluated using whole-cell patch-clamp and immunofluorescence techniques in transiently expressed human embryonic kidney (HEK293) cells. KEY FINDINGS Both variants occur in the highly conservative positions of SCN5A. Although all variants were expressed in the cell membrane, a significant reduction in the Na+ current density (except for G400R alone, which was undetected) was observed along with abnormal biophysical properties, once the variants were expressed in homozygosis and heterozygosis. Interestingly, the incubation of transfected cells with quinidine partially rescued the biophysical properties of the mutant Na+ channel. SIGNIFICANCE De novo compound heterozygosis mutations in SNC5A disrupt the Na+ macroscopic current. Quinidine could partially reverse the in vitro loss-of-function phenotype of Na+ current. Thus, our data provide, for the first time, a detailed biophysical characterization of dysfunctional Na+ channels linked to compound heterozygosity in BrS as well as the benefits of the pharmacological treatment using quinidine on the biophysical properties of Nav1.5.
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Affiliation(s)
- J V Joviano-Santos
- Laboratory of CardioBiology, Department of Biophysics, Federal University of São Paulo, Brazil
| | - A Santos-Miranda
- Laboratory of CardioBiology, Department of Biophysics, Federal University of São Paulo, Brazil
| | - E A Neri
- Laboratory of Genetics and Molecular Cardiology, Heart Institute, University of São Paulo Medical School, São Paulo, Brazil
| | - M H Fonseca-Alaniz
- Laboratory of Genetics and Molecular Cardiology, Heart Institute, University of São Paulo Medical School, São Paulo, Brazil
| | - J E Krieger
- Laboratory of Genetics and Molecular Cardiology, Heart Institute, University of São Paulo Medical School, São Paulo, Brazil
| | - A C Pereira
- Laboratory of Genetics and Molecular Cardiology, Heart Institute, University of São Paulo Medical School, São Paulo, Brazil
| | - D Roman-Campos
- Laboratory of CardioBiology, Department of Biophysics, Federal University of São Paulo, Brazil.
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11
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Gong Z, Ye Q, Wu JW, Zhou JL, Kong XY, Ma LK. UCHL1 inhibition attenuates cardiac fibrosis via modulation of nuclear factor-κB signaling in fibroblasts. Eur J Pharmacol 2021; 900:174045. [PMID: 33745956 DOI: 10.1016/j.ejphar.2021.174045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/17/2021] [Accepted: 03/16/2021] [Indexed: 01/05/2023]
Abstract
The ubiquitin-proteasome system (UPS) plays an essential role in cellular homeostasis and myocardial function. Ubiquitin carboxy-terminal hydrolase 1 (UCHL1) is involved in cardiac remodeling, but its underlying mechanisms are largely unknown. Here, we observed that the UCHL1 was significantly up-regulated in angiotensin II-infused heart and primary cardiac fibroblast (CF). Systemic administration of the UCHL1 inhibitor LDN57444 significantly ameliorated cardiac fibrosis and improved cardiac function induced by angiotensin II. Also, LDN57444 inhibited CF cell proliferation as well as attenuated collagen I, and CTGF gene expression in the presence of Ang II. Mechanistically, UCHL1 promotes angiotensin II-induced fibrotic responses by way of activating nuclear factor kappa B (NF-κB) signaling. Moreover, suppression of the NF-κB pathway interfered with UCHL1 overexpression-mediated fibrotic responses. Besides, the chromatin immunoprecipitation assay demonstrated that NF-κB can bind to the UCHL1 promoter and trigger its transcription in cardiac fibroblasts. These findings suggest that UCHL1 positively regulates cardiac fibrosis by modulating NF-κB signaling pathway and identify UCHL1 could be a new treatment strategy for cardiac fibrosis.
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Affiliation(s)
- Zheng Gong
- Provincial Hospital of Anhui Medical University, Hefei, 230000, Anhui, PR China
| | - Qing Ye
- The First Hospital of University of Science and Technology of China, Hefei, 230000, Anhui, PR China
| | - Jia-Wei Wu
- The First Hospital of University of Science and Technology of China, Hefei, 230000, Anhui, PR China
| | - Jun-Ling Zhou
- The First Hospital of University of Science and Technology of China, Hefei, 230000, Anhui, PR China
| | - Xiang-Yong Kong
- The First Hospital of University of Science and Technology of China, Hefei, 230000, Anhui, PR China
| | - Li-Kun Ma
- Provincial Hospital of Anhui Medical University, Hefei, 230000, Anhui, PR China; The First Hospital of University of Science and Technology of China, Hefei, 230000, Anhui, PR China.
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