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Xu C, Zhang G, Wang X, Huang X, Zhang J, Han S, Wang J, Hall DD, Xu R, He F, Chang X, Wang F, Xie W, Wu Z, Song LS, Han P. Ptpn23 Controls Cardiac T-Tubule Patterning by Promoting the Assembly of Dystrophin-Glycoprotein Complex. Circulation 2024; 149:1375-1390. [PMID: 38214189 PMCID: PMC11039371 DOI: 10.1161/circulationaha.123.065767] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 12/14/2023] [Indexed: 01/13/2024]
Abstract
BACKGROUND Cardiac transverse tubules (T-tubules) are anchored to sarcomeric Z-discs by costameres to establish a regular spaced pattern. One of the major components of costameres is the dystrophin-glycoprotein complex (DGC). Nevertheless, how the assembly of the DGC coordinates with the formation and maintenance of T-tubules under physiological and pathological conditions remains unclear. METHODS Given the known role of Ptpn23 (protein tyrosine phosphatase, nonreceptor type 23) in regulating membrane deformation, its expression in patients with dilated cardiomyopathy was determined. Taking advantage of Cre/Loxp, CRISPR/Cas9, and adeno-associated virus 9 (AAV9)-mediated in vivo gene editing, we generated cardiomyocyte-specific Ptpn23 and Actn2 (α-actinin-2, a major component of Z-discs) knockout mice. We also perturbed the DGC by using dystrophin global knockout mice (DmdE4*). MM 4-64 and Di-8-ANEPPS staining, Cav3 immunofluorescence, and transmission electron microscopy were performed to determine T-tubule structure in isolated cells and intact hearts. In addition, the assembly of the DGC with Ptpn23 and dystrophin loss of function was determined by glycerol-gradient fractionation and SDS-PAGE analysis. RESULTS The expression level of Ptpn23 was reduced in failing hearts from dilated cardiomyopathy patients and mice. Genetic deletion of Ptpn23 resulted in disorganized T-tubules with enlarged diameters and progressive dilated cardiomyopathy without affecting sarcomere organization. AAV9-mediated mosaic somatic mutagenesis further indicated a cell-autonomous role of Ptpn23 in regulating T-tubule formation. Genetic and biochemical analyses showed that Ptpn23 was essential for the integrity of costameres, which anchor the T-tubule membrane to Z-discs, through interactions with α-actinin and dystrophin. Deletion of α-actinin altered the subcellular localization of Ptpn23 and DGCs. In addition, genetic inactivation of dystrophin caused similar T-tubule defects to Ptpn23 loss-of-function without affecting Ptpn23 localization at Z-discs. Last, inducible Ptpn23 knockout at 1 month of age showed Ptpn23 is also required for the maintenance of T-tubules in adult cardiomyocytes. CONCLUSIONS Ptpn23 is essential for cardiac T-tubule formation and maintenance along Z-discs. During postnatal heart development, Ptpn23 interacts with sarcomeric α-actinin and coordinates the assembly of the DGC at costameres to sculpt T-tubule spatial patterning and morphology.
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Affiliation(s)
- Chen Xu
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Ge Zhang
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Xinjian Wang
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Xiaozhi Huang
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Jiayin Zhang
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Shuxian Han
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Jinxi Wang
- Department of Internal Medicine, Abboud Cardiovascular Research Center, Carver College of Medicine, University of Iowa, Iowa City (J.W., D.D.H., L.-S.S.)
| | - Duane D Hall
- Department of Internal Medicine, Abboud Cardiovascular Research Center, Carver College of Medicine, University of Iowa, Iowa City (J.W., D.D.H., L.-S.S.)
| | - Ruoqing Xu
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Feng He
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
| | - Xing Chang
- Research Center for Industries of the Future, Westlake University, Hangzhou, China (X.C.)
| | - Fudi Wang
- School of Public Health, State Key Laboratory of Experimental Hematology (F.W.), Zhejiang University School of Medicine, Hangzhou, China
| | - Wenjun Xie
- Department of Cardiology, First Affiliated Hospital of Xi'an Jiaotong University, China (W.X.)
| | - Zhichao Wu
- Department of Thoracic Surgery, People's Hospital of Xinjiang Uyghur Autonomous Region, Urumqi, China (Z.W.)
- Department of Cardiovascular Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China (Z.W.)
| | - Long-Sheng Song
- Department of Internal Medicine, Abboud Cardiovascular Research Center, Carver College of Medicine, University of Iowa, Iowa City (J.W., D.D.H., L.-S.S.)
| | - Peidong Han
- Center for Genetic Medicine, The Fourth Affiliated Hospital (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.), Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University International School of Medicine, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
- Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Hangzhou, China (C.X., G.Z., X.W., X.H., J.Z., S.H., R.X., F.H., P.H.)
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Manso AM, Okada H, Sakamoto FM, Moreno E, Monkley SJ, Li R, Critchley DR, Ross RS. Loss of mouse cardiomyocyte talin-1 and talin-2 leads to β-1 integrin reduction, costameric instability, and dilated cardiomyopathy. Proc Natl Acad Sci U S A 2017; 114:E6250-E6259. [PMID: 28698364 PMCID: PMC5544289 DOI: 10.1073/pnas.1701416114] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Continuous contraction-relaxation cycles of the heart require strong and stable connections of cardiac myocytes (CMs) with the extracellular matrix (ECM) to preserve sarcolemmal integrity. CM attachment to the ECM is mediated by integrin complexes localized at the muscle adhesion sites termed costameres. The ubiquitously expressed cytoskeletal protein talin (Tln) is a component of muscle costameres that links integrins ultimately to the sarcomere. There are two talin genes, Tln1 and Tln2. Here, we tested the function of these two Tln forms in myocardium where Tln2 is the dominant isoform in postnatal CMs. Surprisingly, global deletion of Tln2 in mice caused no structural or functional changes in heart, presumably because CM Tln1 became up-regulated. Tln2 loss increased integrin activation, although levels of the muscle-specific β1D-integrin isoform were reduced by 50%. With this result, we produced mice that had simultaneous loss of both CM Tln1 and Tln2 and found that cardiac dysfunction occurred by 4 wk with 100% mortality by 6 mo. β1D integrin and other costameric proteins were lost from the CMs, and membrane integrity was compromised. Given that integrin protein reduction occurred with Tln loss, rescue of the phenotype was attempted through transgenic integrin overexpression, but this could not restore WT CM integrin levels nor improve heart function. Our results show that CM Tln2 is essential for proper β1D-integrin expression and that Tln1 can substitute for Tln2 in preserving heart function, but that loss of all Tln forms from the heart-muscle cell leads to myocyte instability and a dilated cardiomyopathy.
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Affiliation(s)
- Ana Maria Manso
- Division of Cardiology, Department of Medicine, University of California at San Diego School of Medicine, La Jolla, CA 92093;
- Cardiology Section, Department of Medicine, Veterans Administration Healthcare, San Diego, CA 92161
| | - Hideshi Okada
- Division of Cardiology, Department of Medicine, University of California at San Diego School of Medicine, La Jolla, CA 92093
- Cardiology Section, Department of Medicine, Veterans Administration Healthcare, San Diego, CA 92161
| | - Francesca M Sakamoto
- Division of Cardiology, Department of Medicine, University of California at San Diego School of Medicine, La Jolla, CA 92093
| | - Emily Moreno
- Division of Cardiology, Department of Medicine, University of California at San Diego School of Medicine, La Jolla, CA 92093
| | - Susan J Monkley
- Department of Molecular Cell Biology, University of Leicester, Leicester LE1 9HN, United Kingdom
| | - Ruixia Li
- Division of Cardiology, Department of Medicine, University of California at San Diego School of Medicine, La Jolla, CA 92093
| | - David R Critchley
- Department of Molecular Cell Biology, University of Leicester, Leicester LE1 9HN, United Kingdom
| | - Robert S Ross
- Division of Cardiology, Department of Medicine, University of California at San Diego School of Medicine, La Jolla, CA 92093;
- Cardiology Section, Department of Medicine, Veterans Administration Healthcare, San Diego, CA 92161
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