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Nagatomo R, Higuchi Y, Takei J, Nakamura T, Hashiguchi H, Takashima H. [A case of myofibrillary myopathy due to Bcl2-Associated Athanogene 3 (BAG3) mutation complicated by peripheral neuropathy]. Rinsho Shinkeigaku 2023; 63:836-842. [PMID: 37989284 DOI: 10.5692/clinicalneurol.cn-001915] [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] [Indexed: 11/23/2023]
Abstract
A 19-year-old female, normal at birth, grew up without neck movement when getting up. She needed a handrail to climb stairs since the age of 10 years old, and walked slowly since the age of 16 years old. Neurological examination revealed loss of deep tendon reflexes, decreased vibratory sensation, weakness of distal muscles of the lower extremities, and weakness of mainly cervical trunk muscles suspected to be due to myopathy. Nerve conduction studies suggested axonal polyneuropathy, and needle EMG showed short duration MUP, myotonic discharge, and rimmed vacuoles on muscle biopsy. Genetic analysis revealed a previously reported pathological mutation (p.P209L, heterozygous) in Bcl2-Associated Athanogene 3 (BAG3), and a diagnosis of MFM6 was made. P209L is a poor prognosis myopathy that develops in childhood and is associated with cardiomyopathy. P209L is a solitary myopathy associated with axonal neuropathy and characterized by apex foot contracture and weak neck to trunk flexion. This disease is suspected in young-onset neuromyopathy.
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Affiliation(s)
- Risa Nagatomo
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences
| | - Yujiro Higuchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences
| | - Jun Takei
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences
| | - Tomonori Nakamura
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences
| | - Hiroaki Hashiguchi
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences
| | - Hiroshi Takashima
- Department of Neurology and Geriatrics, Kagoshima University Graduate School of Medical and Dental Sciences
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2
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Hernandez IE, Prakash A. Coexisting BAG3 Variant and the Anomalous Origin of the Right Coronary Artery Presenting with Recurrent Ventricular Tachycardia. J Innov Card Rhythm Manag 2023; 14:5431-5434. [PMID: 37216087 PMCID: PMC10193872 DOI: 10.19102/icrm.2023.14051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 11/07/2022] [Indexed: 05/24/2023] Open
Abstract
A 49-year-old woman presented with recurrent palpitations and presyncope. Monitoring revealed recurrent non-sustained ventricular tachycardia (VT) episodes. Cardiac catheterization showed the right coronary artery originating from the left coronary cusp. Cardiac computerized tomography revealed the course between the aorta and the pulmonary artery. Despite surgical correction, VT persisted. Genetic testing revealed a rare BCL2-associated athanogene 3 (BAG3) variant associated with dilated cardiomyopathy.
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Affiliation(s)
- Ilsen E. Hernandez
- Medicine/Cardiology Department, St. Mary’s General Hospital, Passaic, NJ, USA
| | - Atul Prakash
- Medicine/Cardiology Department, St. Mary’s General Hospital, Passaic, NJ, USA
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3
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Tedesco B, Vendredy L, Adriaenssens E, Cozzi M, Asselbergh B, Crippa V, Cristofani R, Rusmini P, Ferrari V, Casarotto E, Chierichetti M, Mina F, Pramaggiore P, Galbiati M, Piccolella M, Baets J, Baeke F, De Rycke R, Mouly V, Laurenzi T, Eberini I, Vihola A, Udd B, Weiss L, Kimonis V, Timmerman V, Poletti A. HSPB8 frameshift mutant aggregates weaken chaperone-assisted selective autophagy in neuromyopathies. Autophagy 2023:1-23. [PMID: 36854646 DOI: 10.1080/15548627.2023.2179780] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023] Open
Abstract
Chaperone-assisted selective autophagy (CASA) is a highly selective pathway for the disposal of misfolding and aggregating proteins. In muscle, CASA assures muscle integrity by favoring the turnover of structural components damaged by mechanical strain. In neurons, CASA promotes the removal of aggregating substrates. A crucial player of CASA is HSPB8 (heat shock protein family B (small) member 8), which acts in a complex with HSPA, their cochaperone BAG3, and the E3 ubiquitin ligase STUB1. Recently, four novel HSPB8 frameshift (fs) gene mutations have been linked to neuromyopathies, and encode carboxy-terminally mutated HSPB8, sharing a common C-terminal extension. Here, we analyzed the biochemical and functional alterations associated with the HSPB8_fs mutant proteins. We demonstrated that HSPB8_fs mutants are highly insoluble and tend to form proteinaceous aggregates in the cytoplasm. Notably, all HSPB8 frameshift mutants retain their ability to interact with CASA members but sequester them into the HSPB8-positive aggregates together with two autophagy receptors SQSTM1/p62 and TAX1BP1. This copartitioning process negatively affects the CASA capability to remove its clients and causes a general failure in proteostasis response. Further analyses revealed that the aggregation of the HSPB8_fs mutants occurs independently of the other CASA members or from the autophagy receptors interaction, but it is an intrinsic feature of the mutated amino acid sequence. HSPB8_fs mutants aggregation alters the differentiation capacity of muscle cells and impairs sarcomere organization. Collectively, these results shed light on a potential pathogenic mechanism shared by the HSPB8_fs mutants described in neuromuscular diseases.Abbreviations : ACD: α-crystallin domain; ACTN: actinin alpha; BAG3: BAG cochaperone 3; C: carboxy; CASA: chaperone-assisted selective autophagy; CE: carboxy-terminal extension; CLEM: correlative light and electron microscopy; CMT2L: Charcot-Marie-Tooth type 2L; CTR: carboxy-terminal region; dHMNII: distal hereditary motor neuropathy type II; EV: empty vector; FRA: filter retardation assay; fs: frameshift; HSPA/HSP70: heat shock protein family A (Hsp70); HSPB1/Hsp27: heat shock protein family B (small) member 1; HSPB8/Hsp22: heat shock protein family B (small) member 8; HTT: huntingtin; KO: knockout; MAP1LC3B/LC3: microtubule associated protein 1 light chain 3 beta; MD: molecular dynamics; MTOC: microtubule organizing center; MYH: myosin heavy chain; MYOG: myogenin; NBR1: NBR1 autophagy cargo receptor; CALCOCO2/NDP52: calcium binding and coiled-coil domain 2; NSC34: Neuroblastoma X Spinal Cord 34; OPTN: optineurin; polyQ: polyglutamine; SQSTM1/p62: sequestosome 1; STUB1/CHIP: STIP1 homology and U-box containing protein 1; TARDBP/TDP-43: TAR DNA binding protein; TAX1BP1: Tax1 binding protein 1; TUBA: tubulin alpha; WT: wild-type.
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Affiliation(s)
- Barbara Tedesco
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy.,Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Leen Vendredy
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences and Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Elias Adriaenssens
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences and Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Marta Cozzi
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Bob Asselbergh
- Neuromics Support Facility, VIB Center for Molecular Neurology, VIB, Antwerp, Belgium.,Neuromics Support Facility, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Valeria Crippa
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Riccardo Cristofani
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Paola Rusmini
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Veronica Ferrari
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Elena Casarotto
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Marta Chierichetti
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Francesco Mina
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Paola Pramaggiore
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Mariarita Galbiati
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Margherita Piccolella
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Jonathan Baets
- Laboratory of Neuromuscular Pathology, Institute Born Bunge, and Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.,Neuromuscular Reference Centre, Department of Neurology, Antwerp University Hospital, Antwerp, Belgium
| | - Femke Baeke
- Department of Biomedical Molecular Biology, and VIB Center for Inflammation Research, and VIB Bioimaging Core, Ghent University Ghent, Belgium
| | - Riet De Rycke
- Department of Biomedical Molecular Biology, and VIB Center for Inflammation Research, and VIB Bioimaging Core, Ghent University Ghent, Belgium
| | - Vincent Mouly
- Sorbonne Université, Inserm, Institut de Myologie, Centre de Recherche en Myologie, Paris, France
| | - Tommaso Laurenzi
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Ivano Eberini
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
| | - Anna Vihola
- Folkhälsan Research Center, University of Helsinki, Helsinki, Finland.,Neuromuscular Research Center, Tampere University Hospital, Tampere, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, University of Helsinki, Helsinki, Finland.,Neuromuscular Research Center, Tampere University Hospital, Tampere, Finland.,Vasa Central Hospital, Vasa, Finland
| | - Lan Weiss
- Department of Pediatrics, University of California, Irvine, Lombardy, United States
| | - Virginia Kimonis
- Department of Pediatrics, University of California, Irvine, Lombardy, United States
| | - Vincent Timmerman
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences and Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Angelo Poletti
- Dipartimento di Scienze Farmacologiche e Biomolecolari "Rodolfo Paoletti", Dipartimento di Eccellenza 2018-2027, Università degli Studi di Milano, Milan, Italy
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4
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Tedesco B, Vendredy L, Timmerman V, Poletti A. The chaperone-assisted selective autophagy complex dynamics and dysfunctions. Autophagy 2023:1-23. [PMID: 36594740 DOI: 10.1080/15548627.2022.2160564] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Each protein must be synthesized with the correct amino acid sequence, folded into its native structure, and transported to a relevant subcellular location and protein complex. If any of these steps fail, the cell has the capacity to break down aberrant proteins to maintain protein homeostasis (also called proteostasis). All cells possess a set of well-characterized protein quality control systems to minimize protein misfolding and the damage it might cause. Autophagy, a conserved pathway for the degradation of long-lived proteins, aggregates, and damaged organelles, was initially characterized as a bulk degradation pathway. However, it is now clear that autophagy also contributes to intracellular homeostasis by selectively degrading cargo material. One of the pathways involved in the selective removal of damaged and misfolded proteins is chaperone-assisted selective autophagy (CASA). The CASA complex is composed of three main proteins (HSPA, HSPB8 and BAG3), essential to maintain protein homeostasis in muscle and neuronal cells. A failure in the CASA complex, caused by mutations in the respective coding genes, can lead to (cardio)myopathies and neurodegenerative diseases. Here, we summarize our current understanding of the CASA complex and its dynamics. We also briefly discuss how CASA complex proteins are involved in disease and may represent an interesting therapeutic target.Abbreviation ALP: autophagy lysosomal pathway; ALS: amyotrophic lateral sclerosis; AMOTL1: angiomotin like 1; ARP2/3: actin related protein 2/3; BAG: BAG cochaperone; BAG3: BAG cochaperone 3; CASA: chaperone-assisted selective autophagy; CMA: chaperone-mediated autophagy; DNAJ/HSP40: DnaJ heat shock protein family (Hsp40); DRiPs: defective ribosomal products; EIF2A/eIF2α: eukaryotic translation initiation factor 2A; EIF2AK1/HRI: eukaryotic translation initiation factor 2 alpha kinase 1; GABARAP: GABA type A receptor-associated protein; HDAC6: histone deacetylase 6; HSP: heat shock protein; HSPA/HSP70: heat shock protein family A (Hsp70); HSP90: heat shock protein 90; HSPB8: heat shock protein family B (small) member 8; IPV: isoleucine-proline-valine; ISR: integrated stress response; KEAP1: kelch like ECH associated protein 1; LAMP2A: lysosomal associated membrane protein 2A; LATS1: large tumor suppressor kinase 1; LIR: LC3-interacting region; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MTOC: microtubule organizing center; MTOR: mechanistic target of rapamycin kinase; NFKB/NF-κB: nuclear factor kappa B; NFE2L2: NFE2 like bZIP transcription factor 2; PLCG/PLCγ: phospholipase C gamma; polyQ: polyglutamine; PQC: protein quality control; PxxP: proline-rich; RAN translation: repeat-associated non-AUG translation; SG: stress granule; SOD1: superoxide dismutase 1; SQSTM1/p62: sequestosome 1; STUB1/CHIP: STIP1 homology and U-box containing protein 1; STK: serine/threonine kinase; SYNPO: synaptopodin; TBP: TATA-box binding protein; TARDBP/TDP-43: TAR DNA binding protein; TFEB: transcription factor EB; TPR: tetratricopeptide repeats; TSC1: TSC complex subunit 1; UBA: ubiquitin associated; UPS: ubiquitin-proteasome system; WW: tryptophan-tryptophan; WWTR1: WW domain containing transcription regulator 1; YAP1: Yes1 associated transcriptional regulator.
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Affiliation(s)
- Barbara Tedesco
- Laboratory of Experimental Biology, Dipartimento di Scienze Farmacologiche e Biomolecolari, Dipartimento di Eccellenza 2018-2027, Università degli studi di Milano, Milan, Italy.,Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Leen Vendredy
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences, Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Vincent Timmerman
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences, Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Angelo Poletti
- Laboratory of Experimental Biology, Dipartimento di Scienze Farmacologiche e Biomolecolari, Dipartimento di Eccellenza 2018-2027, Università degli studi di Milano, Milan, Italy
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5
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Wide Spectrum of Cardiac Phenotype in Myofibrillar Myopathy Associated With a Bcl-2-Associated Athanogene 3 Mutation: A Case Report and Literature Review. J Clin Neuromuscul Dis 2022; 24:49-54. [PMID: 36005473 DOI: 10.1097/cnd.0000000000000392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Myofibrillar myopathy is a clinically and genetically heterogeneous group of muscle disorders characterized by myofibrillar degeneration. Bcl-2-associated athanogene 3 (BAG3)-related myopathy is the rarest form of myofibrillar myopathy. Patients with BAG3-related myopathy present with early-onset and progressive muscle weakness, rigid spine, respiratory insufficiency, and cardiomyopathy. Notably, the heterozygous mutation (Pro209Leu) in BAG3 is commonly associated with rapidly progressive cardiomyopathy in childhood. We describe a male patient with the BAG3 (Pro209Leu) mutation. The patient presented at age 7 years with muscle weakness predominantly in the proximal lower limbs. Histologic findings revealed a mixture of severe neurogenic and myogenic changes. His motor symptoms progressed rapidly in the next decade, becoming wheelchair-dependent by age 17 years; however, at the age of 19 years, cardiomyopathy was not evident. This study reports a case of BAG3-related myopathy without cardiac involvement and further confirmed the wide phenotypic spectrum of BAG3-related myopathy.
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6
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Tedesco B, Cristofani R, Ferrari V, Cozzi M, Rusmini P, Casarotto E, Chierichetti M, Mina F, Galbiati M, Piccolella M, Crippa V, Poletti A. Insights on Human Small Heat Shock Proteins and Their Alterations in Diseases. Front Mol Biosci 2022; 9:842149. [PMID: 35281256 PMCID: PMC8913478 DOI: 10.3389/fmolb.2022.842149] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 01/19/2022] [Indexed: 11/13/2022] Open
Abstract
The family of the human small Heat Shock Proteins (HSPBs) consists of ten members of chaperones (HSPB1-HSPB10), characterized by a low molecular weight and capable of dimerization and oligomerization forming large homo- or hetero-complexes. All HSPBs possess a highly conserved centrally located α-crystallin domain and poorly conserved N- and C-terminal domains. The main feature of HSPBs is to exert cytoprotective functions by preserving proteostasis, assuring the structural maintenance of the cytoskeleton and acting in response to cellular stresses and apoptosis. HSPBs take part in cell homeostasis by acting as holdases, which is the ability to interact with a substrate preventing its aggregation. In addition, HSPBs cooperate in substrates refolding driven by other chaperones or, alternatively, promote substrate routing to degradation. Notably, while some HSPBs are ubiquitously expressed, others show peculiar tissue-specific expression. Cardiac muscle, skeletal muscle and neurons show high expression levels for a wide variety of HSPBs. Indeed, most of the mutations identified in HSPBs are associated to cardiomyopathies, myopathies, and motor neuropathies. Instead, mutations in HSPB4 and HSPB5, which are also expressed in lens, have been associated with cataract. Mutations of HSPBs family members encompass base substitutions, insertions, and deletions, resulting in single amino acid substitutions or in the generation of truncated or elongated proteins. This review will provide an updated overview of disease-related mutations in HSPBs focusing on the structural and biochemical effects of mutations and their functional consequences.
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Affiliation(s)
- B. Tedesco
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - R. Cristofani
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - V. Ferrari
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - M. Cozzi
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - P. Rusmini
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - E. Casarotto
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - M. Chierichetti
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - F. Mina
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - M. Galbiati
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - M. Piccolella
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - V. Crippa
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | - A. Poletti
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
- *Correspondence: A. Poletti,
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Bang ML, Bogomolovas J, Chen J. Understanding the molecular basis of cardiomyopathy. Am J Physiol Heart Circ Physiol 2022; 322:H181-H233. [PMID: 34797172 PMCID: PMC8759964 DOI: 10.1152/ajpheart.00562.2021] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/16/2021] [Accepted: 11/16/2021] [Indexed: 02/03/2023]
Abstract
Inherited cardiomyopathies are a major cause of mortality and morbidity worldwide and can be caused by mutations in a wide range of proteins located in different cellular compartments. The present review is based on Dr. Ju Chen's 2021 Robert M. Berne Distinguished Lectureship of the American Physiological Society Cardiovascular Section, in which he provided an overview of the current knowledge on the cardiomyopathy-associated proteins that have been studied in his laboratory. The review provides a general summary of the proteins in different compartments of cardiomyocytes associated with cardiomyopathies, with specific focus on the proteins that have been studied in Dr. Chen's laboratory.
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Affiliation(s)
- Marie-Louise Bang
- Institute of Genetic and Biomedical Research (IRGB), National Research Council (CNR), Milan Unit, Milan, Italy
- IRCCS Humanitas Research Hospital, Rozzano (Milan), Italy
| | - Julius Bogomolovas
- Division of Cardiovascular Medicine, Department of Medicine Cardiology, University of California, San Diego, La Jolla, California
| | - Ju Chen
- Division of Cardiovascular Medicine, Department of Medicine Cardiology, University of California, San Diego, La Jolla, California
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8
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Daimi H, Lozano-Velasco E, Aranega A, Franco D. Genomic and Non-Genomic Regulatory Mechanisms of the Cardiac Sodium Channel in Cardiac Arrhythmias. Int J Mol Sci 2022; 23:1381. [PMID: 35163304 PMCID: PMC8835759 DOI: 10.3390/ijms23031381] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/30/2021] [Accepted: 01/06/2022] [Indexed: 12/19/2022] Open
Abstract
Nav1.5 is the predominant cardiac sodium channel subtype, encoded by the SCN5A gene, which is involved in the initiation and conduction of action potentials throughout the heart. Along its biosynthesis process, Nav1.5 undergoes strict genomic and non-genomic regulatory and quality control steps that allow only newly synthesized channels to reach their final membrane destination and carry out their electrophysiological role. These regulatory pathways are ensured by distinct interacting proteins that accompany the nascent Nav1.5 protein along with different subcellular organelles. Defects on a large number of these pathways have a tremendous impact on Nav1.5 functionality and are thus intimately linked to cardiac arrhythmias. In the present review, we provide current state-of-the-art information on the molecular events that regulate SCN5A/Nav1.5 and the cardiac channelopathies associated with defects in these pathways.
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Affiliation(s)
- Houria Daimi
- Biochemistry and Molecular Biology Laboratory, Faculty of Pharmacy, University of Monastir, Monastir 5000, Tunisia
| | - Estefanía Lozano-Velasco
- Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (A.A.); (D.F.)
- Medina Foundation, Technology Park of Health Sciences, Av. del Conocimiento, 34, 18016 Granada, Spain
| | - Amelia Aranega
- Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (A.A.); (D.F.)
- Medina Foundation, Technology Park of Health Sciences, Av. del Conocimiento, 34, 18016 Granada, Spain
| | - Diego Franco
- Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (A.A.); (D.F.)
- Medina Foundation, Technology Park of Health Sciences, Av. del Conocimiento, 34, 18016 Granada, Spain
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9
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Zhan L, Lv L, Chen X, Xu X, Ni J. Ultrasound evaluation of diaphragm motion in BAG-3 myofibrillar myopathy: A case report. Medicine (Baltimore) 2022; 101:e28484. [PMID: 35029900 PMCID: PMC8735720 DOI: 10.1097/md.0000000000028484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 12/16/2021] [Indexed: 11/25/2022] Open
Abstract
RATIONALE Mutations in Bcl-2-associated athanogene-3 (BAG-3) can cause a rare subtype of myofibrillar myopathies (MFMs), characterized by progressive muscle weakness, cardiomyopathy, and severe respiratory insufficiency in childhood. Little is known about diaphragmatic function in BAG-3 MFM. To our knowledge, this is the first case report of detailed evaluation of diaphragmatic function with ultrasound in BAG-3 MFM. PATIENT CONCERN We describe the case of a 15-year-old girl who complained of fever and shortness of breath. Diaphragmatic sonography revealed bilateral diaphragmatic paralysis. Shortness of breath progressed to respiratory failure approximately 3 months later. DIAGNOSIS A neurologist was consulted and genetic sequencing identified a p.Pro209Leu mutation in BAG-3, yielding diagnosis of BAG-3 MFM leading to bilateral diaphragmatic paralysis. INTERVENTIONS Respiratory muscle training and long-term mechanical ventilation. OUTCOMES It is quite unfortunate for this patient to have a poor prognosis due to the lack of effective treatment for this genetic disorder. LESSONS This case provides more clinical information for this rare disease which may cause severe diaphragm pathological damage leading to respiratory failure in BAG3 MFM and a future study with a systematic evaluation of a greater number of patients will be necessary to characterize this population.
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Affiliation(s)
- Liqiong Zhan
- Department of Rehabilitation Medicine, First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Lan Lv
- Department of Rehabilitation Medicine, First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Xinyuan Chen
- Department of Rehabilitation Medicine, First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Xiang Xu
- Department of Ultrasound Medicine, First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Jun Ni
- Department of Rehabilitation Medicine, First Affiliated Hospital of Fujian Medical University, Fuzhou, China
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Lin H, Koren SA, Cvetojevic G, Girardi P, Johnson GV. The role of BAG3 in health and disease: A "Magic BAG of Tricks". J Cell Biochem 2022; 123:4-21. [PMID: 33987872 PMCID: PMC8590707 DOI: 10.1002/jcb.29952] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 04/25/2021] [Indexed: 01/03/2023]
Abstract
The multi-domain structure of Bcl-2-associated athanogene 3 (BAG3) facilitates its interaction with many different proteins that participate in regulating a variety of biological pathways. After revisiting the BAG3 literature published over the past ten years with Citespace software, we classified the BAG3 research into several clusters, including cancer, cardiomyopathy, neurodegeneration, and viral propagation. We then highlighted recent key findings in each cluster. To gain greater insight into the roles of BAG3, we analyzed five different published mass spectrometry data sets of proteins that co-immunoprecipitate with BAG3. These data gave us insight into universal, as well as cell-type-specific BAG3 interactors in cancer cells, cardiomyocytes, and neurons. Finally, we mapped variable BAG3 SNPs and also mutation data from previous publications to further explore the link between the domains and function of BAG3. We believe this review will provide a better understanding of BAG3 and direct future studies towards understanding BAG3 function in physiological and pathological conditions.
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Affiliation(s)
- Heng Lin
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Rochester NY 14642 USA
| | - Shon A. Koren
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Rochester NY 14642 USA
| | - Gregor Cvetojevic
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Rochester NY 14642 USA
| | - Peter Girardi
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Rochester NY 14642 USA
| | - Gail V.W. Johnson
- Department of Anesthesiology and Perioperative Medicine, University of Rochester Medical Center, Rochester NY 14642 USA
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11
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BAG3 Myopathy Presenting With Prominent Neuropathic Phenotype and No Cardiac or Respiratory Involvement: A Case Report and Literature Review. J Clin Neuromuscul Dis 2021; 21:230-239. [PMID: 32453099 DOI: 10.1097/cnd.0000000000000300] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Bcl-2-associated athanogene 3 (BAG3) myopathy is a rare myofibrillar myopathy characterized by toe walking and clumsiness in the first decade with rapid progression to cardiomyopathy and restrictive lung disease in the second decade. Most patients (18 patients) have the c.626C >T (p.Pro209Leu) mutation. We describe BAG3 myopathy due to p.Pro209Leu in a 13-year-old girl with initial prominent neuropathic phenotype and no cardiac or respiratory involvement. Parents reported toe walking and clumsiness since 3 years old. Examination at the age of 13 years showed findings suggestive of Charcot-Marie-Tooth disease. Nerve conduction studies revealed demyelinating polyneuropathy. Next-generation sequencing panel for inherited neuropathies was unrevealing. Whole exome sequencing identified a de novo mutation in BAG3. Muscle biopsy confirmed myofibrillar myopathy. No cardiac involvement or symptoms of respiratory involvement at the age of 14 years. This case emphasizes the phenotypic variability of BAG3 myopathy and the importance of thorough electrophysiological examination and muscle pathology for establishing a precise diagnosis.
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12
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BAG3 Proteomic Signature under Proteostasis Stress. Cells 2020; 9:cells9112416. [PMID: 33158300 PMCID: PMC7694386 DOI: 10.3390/cells9112416] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 10/28/2020] [Accepted: 10/31/2020] [Indexed: 12/13/2022] Open
Abstract
The multifunctional HSP70 co-chaperone BAG3 (BCL-2-associated athanogene 3) represents a key player in the quality control of the cellular proteostasis network. In response to stress, BAG3 specifically targets aggregation-prone proteins to the perinuclear aggresome and promotes their degradation via BAG3-mediated selective macroautophagy. To adapt cellular homeostasis to stress, BAG3 modulates and functions in various cellular processes and signaling pathways. Noteworthy, dysfunction and deregulation of BAG3 and its pathway are pathophysiologically linked to myopathies, cancer, and neurodegenerative disorders. Here, we report a BAG3 proteomic signature under proteostasis stress. To elucidate the dynamic and multifunctional action of BAG3 in response to stress, we established BAG3 interactomes under basal and proteostasis stress conditions by employing affinity purification combined with quantitative mass spectrometry. In addition to the identification of novel potential BAG3 interactors, we defined proteins whose interaction with BAG3 was altered upon stress. By functional annotation and protein-protein interaction enrichment analysis of the identified potential BAG3 interactors, we confirmed the multifunctionality of BAG3 and highlighted its crucial role in diverse cellular signaling pathways and processes, ensuring cellular proteostasis and cell viability. These include protein folding and degradation, gene expression, cytoskeleton dynamics (including cell cycle and transport), as well as granulostasis, in particular.
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13
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A family with adult-onset myofibrillar myopathy with BAG3 mutation (P470S) presenting with axonal polyneuropathy. Neuromuscul Disord 2020; 30:727-731. [PMID: 32859500 DOI: 10.1016/j.nmd.2020.07.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 06/05/2020] [Accepted: 07/28/2020] [Indexed: 11/22/2022]
Abstract
We report a family with adult-onset myofibrillar myopathy with BAG3 mutation who presented peroneal weakness and axonal polyneuropathy, mimicking axonal Charcot-Marie-Tooth disease. The male proband noticed difficulty in tiptoeing at age 34. At age 42, the examination showed muscle weakness and atrophy in distal lower extremities with diminished patellar and Achilles tendon reflexes. Thermal and vibration sensations were also impaired in both feet. The serum CK level was 659 U/L. On muscle imaging, predominant semitendinosus muscle atrophy coexisted with atrophies in the quadriceps, gastrocnemius and lumbar paraspinal muscles. The muscle biopsy showed myofibrillar myopathy with fiber type grouping. His 68-year-old mother also had suffered from distal leg weakness and sensory impairment since her forties. A heterozygous mutation in BAG3 (P470S) was identified in both patients. Clinical features of myofibrillar myopathy with axonal polyneuropathy were consistent with BAG3-related myopathy. Our patients showed remarkably mild presentations without cardiomyopathy, unlike the majorities of previously reported cases.
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14
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Neuromuscular Diseases Due to Chaperone Mutations: A Review and Some New Results. Int J Mol Sci 2020; 21:ijms21041409. [PMID: 32093037 PMCID: PMC7073051 DOI: 10.3390/ijms21041409] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 12/12/2022] Open
Abstract
Skeletal muscle and the nervous system depend on efficient protein quality control, and they express chaperones and cochaperones at high levels to maintain protein homeostasis. Mutations in many of these proteins cause neuromuscular diseases, myopathies, and hereditary motor and sensorimotor neuropathies. In this review, we cover mutations in DNAJB6, DNAJB2, αB-crystallin (CRYAB, HSPB5), HSPB1, HSPB3, HSPB8, and BAG3, and discuss the molecular mechanisms by which they cause neuromuscular disease. In addition, previously unpublished results are presented, showing downstream effects of BAG3 p.P209L on DNAJB6 turnover and localization.
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15
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Robertson R, Conte TC, Dicaire MJ, Rymar VV, Sadikot AF, Bryson-Richardson RJ, Lavoie JN, O'Ferrall E, Young JC, Brais B. BAG3 P215L/KO Mice as a Model of BAG3 P209L Myofibrillar Myopathy. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:554-562. [PMID: 31953038 DOI: 10.1016/j.ajpath.2019.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 11/22/2019] [Accepted: 11/26/2019] [Indexed: 10/25/2022]
Abstract
BCL-2-associated athanogene 3 (BAG3) is a co-chaperone to heat shock proteins important in degrading misfolded proteins through chaperone-assisted selective autophagy. The recurrent dominant BAG3-P209L mutation results in a severe childhood-onset myofibrillar myopathy (MFM) associated with progressive muscle weakness, cardiomyopathy, and respiratory failure. Because a homozygous knock-in (KI) strain for the mP215L mutation homologous to the human P209L mutation did not have a gross phenotype, compound heterozygote knockout (KO) and KI mP215L mice were generated to establish whether further reduction in BAG3 expression would lead to a phenotype. The KI/KO mice have a significant decrease in voluntary movement compared with wild-type and KI/KI mice in the open field starting at 7 months. The KI/KI and KI/KO mice both have significantly smaller muscle fiber cross-sectional area. However, only the KI/KO mice have clear skeletal muscle histologic changes in MFM. As in patient muscle, there are increased levels of BAG3-interacting proteins, such as p62, heat shock protein B8, and αB-crystallin. The KI/KO mP215L strain is the first murine model of BAG3 myopathy that resembles the human skeletal muscle pathologic features. The results support the hypothesis that the pathologic development of MFM requires a significant decrease in BAG3 protein level and not only a gain of function caused by the dominant missense mutation.
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Affiliation(s)
- Rebecca Robertson
- Neurogenetics of Motion Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Human Genetics, McGill University, Montreal, Quebec, Canada
| | - Talita C Conte
- Neurogenetics of Motion Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada; Department of Human Genetics, McGill University, Montreal, Quebec, Canada
| | - Marie-Josée Dicaire
- Neurogenetics of Motion Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Vladimir V Rymar
- Cone Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Abbas F Sadikot
- Cone Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | | | - Josée N Lavoie
- Centre de Recherche sur le Cancer, l'Université Laval, Québec, Quebec, Canada; Oncology Axis, Centre de Recherche du Centre Hospitalier Universitaire (CHU), Québec-Université Laval, Québec, Quebec, Canada; Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, l'Université Laval, Québec, Quebec, Canada
| | - Erin O'Ferrall
- Rare Neurological Diseases Group, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Jason C Young
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
| | - Bernard Brais
- Neurogenetics of Motion Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.
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16
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Fu J, Ma M, Song J, Pang M, Li G, Zhang J. BAG3 p.Pro209Ser mutation identified in a Chinese family with Charcot-Marie-Tooth disease. J Neurol 2019; 267:1080-1085. [PMID: 31853710 DOI: 10.1007/s00415-019-09680-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 12/12/2019] [Accepted: 12/14/2019] [Indexed: 12/18/2022]
Abstract
Bcl2-associated athanogene 3 (BAG3) gene mutations cause dilated cardiomyopathy and myofibrillar myopathy. Recently, a novel c.625C>T (p.Pro209Ser) mutation in BAG3 was reported to cause axonal Charcot-Marie-Tooth (CMT) disease in three families. Here, we describe two patients with adult-onset and moderate CMT in a Chinese family. Nerve conduction velocity studies revealed an axonal sensorimotor neuropathy, which was supported by sural nerve biopsy. Lower limb magnetic resonance imaging (MRI) revealed fatty infiltration more severe in the soleus and deep posterior compartment muscles than in the medial gastrocnemius and anterior compartment muscles. Whole exome sequencing identified the same c.625C>T (p.Pro209Ser) mutation in BAG3, which co-segregated with the CMT disease in this family. This study further enforces the association between BAG3 gene and CMT disease, indicating that BAG3 should be considered in the genetic testing for CMT. The p.Pro209Ser mutation with different ethnic origins might be another hotspot mutation of BAG3. MRI is helpful to detect accurate extent of muscle involvement.
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Affiliation(s)
- Jun Fu
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan, China
| | - Mingming Ma
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan, China
| | - Jia Song
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan, China
| | - Mi Pang
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan, China
| | - Gang Li
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan, China
| | - Jiewen Zhang
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Henan University, No. 7, Weiwu Road, Zhengzhou, 450003, Henan, China.
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Abstract
The B cell lymphoma 2-associated anthanogene (BAG3) is an anti-apoptotic co-chaperone protein. Previous reports suggest that mutations in BAG3 are associated with dilated cardiomyopathy. This review aims to summarize the current understanding of the relationship between BAG3 mutations and dilated cardiomyopathy, primarily focusing on the role and protective mechanism of BAG3 in cardiomyocytes from individuals with dilated cardiomyopathy. The results of published studies show that BAG3 is critically important for reducing cardiomyocyte apoptosis, maintaining protein homeostasis, regulating mitochondrial stability, modulating myocardial contraction, and reducing cardiac arrhythmia, which suggests an indispensable protective mechanism of BAG3 in dilated cardiomyopathy. The significant role of BAG3 in protecting cardiomyocytes provides a new direction for the diagnosis and treatment of dilated cardiomyopathy. However, further research is required to explore the molecular mechanisms that regulate BAG3 expression, to identify a novel therapy for patients with dilated cardiomyopathy.
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18
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ANO5 mutations in the Polish limb girdle muscular dystrophy patients: Effects on the protein structure. Sci Rep 2019; 9:11533. [PMID: 31395899 PMCID: PMC6687736 DOI: 10.1038/s41598-019-47849-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 07/25/2019] [Indexed: 01/06/2023] Open
Abstract
LGMD2L is a subtype of limb-girdle muscular dystrophy (LGMD), caused by recessive mutations in ANO5, encoding anoctamin-5 (ANO5). We present the analysis of five patients with skeletal muscle weakness for whom heterozygous mutations within ANO5 were identified by whole exome sequencing (WES). Patients varied in the age of the disease onset (from 22 to 38 years) and severity of the morphological and clinical phenotypes. Out of the nine detected mutations one was novel (missense p.Lys132Met, accompanied by p.His841Asp) and one was not yet characterized in the literature (nonsense, p.Trp401Ter, accompanied by p.Asp81Gly). The p.Asp81Gly mutation was also identified in another patient carrying a p.Arg758Cys mutation as well. Also, a c.191dupA frameshift (p.Asn64LysfsTer15), the first described and common mutation was identified. Mutations were predicted by in silico tools to have damaging effects and are likely pathogenic according to criteria of the American College of Medical Genetics and Genomics (ACMG). Indeed, molecular modeling of mutations revealed substantial changes in ANO5 conformation that could affect the protein structure and function. In addition, variants in other genes associated with muscle pathology were identified, possibly affecting the disease progress. The presented data indicate that the identified ANO5 mutations contribute to the observed muscle pathology and broaden the genetic spectrum of LGMD myopathies.
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19
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Al-Tahan S, Weiss L, Yu H, Tang S, Saporta M, Vihola A, Mozaffar T, Udd B, Kimonis V. New family with HSPB8-associated autosomal dominant rimmed vacuolar myopathy. NEUROLOGY-GENETICS 2019; 5:e349. [PMID: 31403083 PMCID: PMC6659134 DOI: 10.1212/nxg.0000000000000349] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 05/16/2019] [Indexed: 12/29/2022]
Abstract
Objective We clinically and molecularly characterize a new family with autosomal dominant rimmed vacuolar myopathy (RVM) caused by mutations in the HSPB8 gene. Methods We performed whole-exome and whole-genome sequencing in the family. Western blot and immunocytochemistry were used to analyze 3 patient fibroblasts, and findings were compared with their age- and sex-matched controls. Results Affected patients have distal and proximal myopathy, with muscle biopsy showing rimmed vacuoles, muscle fiber atrophy, and endomysial fibrosis typical of RVM. Muscle MRI showed severe relatively symmetric multifocal fatty degenerative changes of the lower extremities. We identified a duplication of C at position 515 of the HSPB8 gene (c.515dupC) by whole-genome sequencing, which caused a frameshift with a predicted alternate stop codon p.P173SFS*43 in all affected individuals, resulting in an elongated protein product. Western blot and immunocytochemistry studies revealed reduced expression of heat shock protein beta 8 in patient fibroblasts compared with control fibroblasts, in addition to disrupted autophagy pathology. Conclusions We report a novel family with autosomal dominant RVM caused by the c.515dupC mutation of the HSPB8 gene, causing a translational frameshift that results in an elongated protein. Understanding the mechanism for the RVM pathology caused by mutated chaperone will permit novel targeted strategies to alter the natural history progression. As next-generation sequencing becomes more available, additional myopathic families will be identified with HSPB8 mutations.
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Affiliation(s)
- Sejad Al-Tahan
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Lan Weiss
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Howard Yu
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Sha Tang
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Mario Saporta
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Anna Vihola
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Tahseen Mozaffar
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Bjarne Udd
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
| | - Virginia Kimonis
- Division of Genetics and Genomic Medicine (S.A.-T., L.W., H.Y.), Department of Pediatrics, University of California, Irvine; Opti West (S.A.-T.), West Anaheim Medical Center, Anaheim; Ambry Genetics (S.T.), Mission Viejo, CA; Miller School of Medicine (M.S.), University of Miami, FL; Folkhälsan Institute of Genetics and the Department of Medical Genetics (A.V., B.U.), Medicum, University of Helsinki; Neuromuscular Research Center (A.V., B.U.), Tampere University and University Hospital, Neurology, Finland; Neuromuscular Program (T.M.), Department of Neurology, University of California-Irvine, Orange; and Neurology Department (B.U.), Vasa Central Hospital, Finland
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Fang X, Bogomolovas J, Zhou PS, Mu Y, Ma X, Chen Z, Zhang L, Zhu M, Veevers J, Ouyang K, Chen J. P209L mutation in Bag3 does not cause cardiomyopathy in mice. Am J Physiol Heart Circ Physiol 2018; 316:H392-H399. [PMID: 30499714 DOI: 10.1152/ajpheart.00714.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Bcl-2-associated athanogene 3 (BAG3) is a cochaperone protein and a central player of the cellular protein quality control system. BAG3 is prominently expressed in the heart and plays an essential role in cardiac protein homeostasis by interacting with chaperone heat shock proteins (HSPs) in large, functionally distinct multichaperone complexes. The BAG3 mutation of proline 209 to leucine (P209L), which resides in a critical region that mediates the direct interaction between BAG3 and small HSPs (sHSPs), is associated with cardiomyopathy in humans. However, the mechanism by which the BAG3 P209L missense mutation leads to cardiomyopathy remains unknown. To determine the molecular basis underlying the cardiomyopathy caused by the BAG3 P209L mutation, we generated a knockin (KI) mouse model in which the endogenous Bag3 gene was replaced with mutant Bag3 containing the P215L mutation, which is equivalent to the human P209L mutation. We performed physiological, histological, and biochemical analyses of Bag3 P209L KI mice to determine the functional, morphological, and molecular consequences of the P209L mutation. We found that Bag3 P209L KI mice exhibited normal cardiac function and morphology up to 16 mo of age. Western blot analysis further revealed that levels of sHSPs, stress-inducible HSPs, ubiquitinated proteins, and autophagy were unaffected in P209L mutant mouse hearts. In conclusion, the P209L mutation in Bag3 does not cause cardiomyopathy in mice up to 16 mo of age under baseline conditions. NEW & NOTEWORTHY Bcl-2-associated athanogene 3 (BAG3) P209L mutation is associated with human cardiomyopathy. A recent study reported that transgenic mice overexpressing human BAG3 P209L in cardiomyocytes have cardiac dysfunction. In contrast, our P209L mice that express mutant BAG3 at the same level as that of wild-type mice displayed no overt phenotype. Our results suggest that human cardiomyopathy may result from species-specific requirements for the conserved motif that is disrupted by P209L mutation or from genetic background-dependent effects.
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Affiliation(s)
- Xi Fang
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Julius Bogomolovas
- Department of Medicine, University of California-San Diego , La Jolla, California.,Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University , Mannheim , Germany
| | - Paul Shichao Zhou
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Yongxin Mu
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Xiaolong Ma
- Department of Medicine, University of California-San Diego , La Jolla, California.,Department of Cardiothoracic Surgery, The Second Xiangya Hospital, Central South University , Changsha, Hunan , China
| | - Zee Chen
- Department of Medicine, University of California-San Diego , La Jolla, California.,Drug Discovery Center, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen , China
| | - Lunfeng Zhang
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Mason Zhu
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Jennifer Veevers
- Department of Medicine, University of California-San Diego , La Jolla, California
| | - Kunfu Ouyang
- Drug Discovery Center, Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen , China
| | - Ju Chen
- Department of Medicine, University of California-San Diego , La Jolla, California
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21
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Andersen AG, Fornander F, Schrøder HD, Krag T, Straub V, Duno M, Vissing J. BAG3 myopathy is not always associated with cardiomyopathy. Neuromuscul Disord 2018; 28:798-801. [DOI: 10.1016/j.nmd.2018.06.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 05/03/2018] [Accepted: 06/30/2018] [Indexed: 02/05/2023]
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22
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Kim SJ, Nam SH, Kanwal S, Nam DE, Yoo DH, Chae JH, Suh YL, Chung KW, Choi BO. BAG3 mutation in a patient with atypical phenotypes of myofibrillar myopathy and Charcot-Marie-Tooth disease. Genes Genomics 2018; 40:1269-1277. [PMID: 30145633 DOI: 10.1007/s13258-018-0721-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/18/2018] [Indexed: 12/16/2022]
Abstract
Bcl2-associated athanogene 3 (BAG3) mutations have been reported to cause the myofibrillar myopathy (MFM) which shows progressive limb muscle weakness, respiratory failure, and cardiomyopathy. Myopathy patients with BAG3 mutation are very rare. We described a patient showing atypical phenotypes. We aimed to find the genetic cause of Korean patients with sensory motor polyneuropathy, myopathy and rigid spine. We performed whole exome sequencing (WES) with 423 patients with sensory motor polyneuropathy. We found BAG3 mutation in one patient with neuropathy, myopathy and rigid spine syndrome, and performed electrophysiological study, whole body MRI and muscle biopsy on the patient. A de novo heterozygous p.Pro209Leu (c.626C>T) mutation in BAG3 was identified in a female myopathy. She first noticed a gait disturbance and spinal rigidity at the age of 11, and serum creatine kinase levels were elevated ninefolds than normal. She showed an axonal sensory-motor polyneuropathy like Charcot-Marie-Tooth disease (CMT), myopathy, rigid spine and respiratory dysfunction; however, she did not show any cardiomyopathy, which is a common symptom in BAG3 mutation. Lower limb MRI and whole spine MRI showed bilateral symmetric fatty atrophy of muscles at the lower limb and paraspinal muscles. When we track traceable MRI 1 year later, the muscle damage progressed slowly. As far as our knowledge, this is the first Korean patient with BAG3 mutation. We described a BAG3 mutation patient with atypical phenotype of CMT and myopathy, and those are expected to broaden the clinical spectrum of the disease and help to diagnose it.
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Affiliation(s)
- Seung Ju Kim
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea
| | - Soo Hyun Nam
- Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea
| | - Sumaira Kanwal
- Department of Biosciences, COMSATS Institute of Information Technology, Sahiwal, Pakistan
| | - Da Eun Nam
- Department of Biological Sciences, Kongju National University, 56 Gonjudaehak-ro, Gongju, 32588, South Korea
| | - Da Hye Yoo
- Department of Biological Sciences, Kongju National University, 56 Gonjudaehak-ro, Gongju, 32588, South Korea
| | - Jong-Hee Chae
- Department of Pediatrics, Seoul National University College of Medicine, 101 Daehak-ro Jongno-gu, Seoul, 03080, South Korea
| | - Yeon-Lim Suh
- Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea
| | - Ki Wha Chung
- Department of Biological Sciences, Kongju National University, 56 Gonjudaehak-ro, Gongju, 32588, South Korea.
| | - Byung-Ok Choi
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea. .,Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea.
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23
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Translating emerging molecular genetic insights into clinical practice in inherited cardiomyopathies. J Mol Med (Berl) 2018; 96:993-1024. [PMID: 30128729 DOI: 10.1007/s00109-018-1685-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 07/22/2018] [Accepted: 08/08/2018] [Indexed: 12/19/2022]
Abstract
Cardiomyopathies are primarily genetic disorders of the myocardium associated with higher risk of life-threatening cardiac arrhythmias, heart failure, and sudden cardiac death. The evolving knowledge in genomic medicine during the last decade has reshaped our understanding of cardiomyopathies as diseases of multifactorial nature and complex pathophysiology. Genetic testing in cardiomyopathies has subsequently grown from primarily a research tool into an essential clinical evaluation piece with important clinical implications for patients and their families. The purpose of this review is to provide with a contemporary insight into the implications of genetic testing in diagnosis, therapy, and prognosis of patients with inherited cardiomyopathies. Here, we summarize the contemporary knowledge on genotype-phenotype correlations in inherited cardiomyopathies and highlight the recent significant achievements in the field of translational cardiovascular genetics.
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24
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Finsterer J, Zarrouk-Mahjoub S. BAG3-related myofibrillar myopathy requiring heart transplantation for restrictive cardiomyopathy. Mol Genet Metab Rep 2018; 15:65-66. [PMID: 30023292 PMCID: PMC6047054 DOI: 10.1016/j.ymgmr.2018.02.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 02/01/2018] [Indexed: 02/02/2023] Open
Affiliation(s)
| | - Sinda Zarrouk-Mahjoub
- University of Tunis El Manar, Genomics Platform, Pasteur Institute of Tunis, Tunisia
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25
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Avila F, Mickelson JR, Schaefer RJ, McCue ME. Genome-Wide Signatures of Selection Reveal Genes Associated With Performance in American Quarter Horse Subpopulations. Front Genet 2018; 9:249. [PMID: 30105047 PMCID: PMC6060370 DOI: 10.3389/fgene.2018.00249] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 06/22/2018] [Indexed: 11/13/2022] Open
Abstract
Selective breeding for athletic performance in various disciplines has resulted in population stratification within the American Quarter Horse (QH) breed. The goals of this study were to utilize high density genotype data to: (1) identify genomic regions undergoing positive selection within and among QH subpopulations; (2) investigate haplotype structure within each QH subpopulation; and (3) identify candidate genes within genomic regions of interest (ROI), as well as biological pathways, predicted to play a role in elite performance in each group. For that, 65K SNP genotyping data on 143 elite individuals from 6 QH subpopulations (cutting, halter, racing, reining, western pleasure, and working cow) were imputed to 2M SNPs. Signatures of selection were identified using FST-based (di ) and haplotype-based (hapFLK) analyses, accompanied by identification of local haplotype structure and sharing within subpopulations (hapQTL). Regions undergoing positive selection were identified on all 31 autosomes, and ROI on 2 chromosomes were identified by all 3 methods combined. Genes within each ROI were retrieved and used to identify pathways and genes that might contribute to performance in each subpopulation. These included, among others, candidate genes associated with skeletal muscle development, metabolism, and central nervous system development. This work improves our understanding of equine breed development, and provides breeders with a better understanding of how selective breeding impacts the performance of QH populations.
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Affiliation(s)
- Felipe Avila
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
| | - James R Mickelson
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
| | - Robert J Schaefer
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
| | - Molly E McCue
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
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26
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Ranek MJ, Stachowski MJ, Kirk JA, Willis MS. The role of heat shock proteins and co-chaperones in heart failure. Philos Trans R Soc Lond B Biol Sci 2018; 373:rstb.2016.0530. [PMID: 29203715 DOI: 10.1098/rstb.2016.0530] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2017] [Indexed: 12/18/2022] Open
Abstract
The ongoing contractile and metabolic demands of the heart require a tight control over protein quality control, including the maintenance of protein folding, turnover and synthesis. In heart disease, increases in mechanical and oxidative stresses, post-translational modifications (e.g., phosphorylation), for example, decrease protein stability to favour misfolding in myocardial infarction, heart failure or ageing. These misfolded proteins are toxic to cardiomyocytes, directly contributing to the common accumulation found in human heart failure. One of the critical class of proteins involved in protecting the heart against these threats are molecular chaperones, including the heat shock protein70 (HSP70), HSP90 and co-chaperones CHIP (carboxy terminus of Hsp70-interacting protein, encoded by the Stub1 gene) and BAG-3 (BCL2-associated athanogene 3). Here, we review their emerging roles in the maintenance of cardiomyocytes in human and experimental models of heart failure, including their roles in facilitating the removal of misfolded and degraded proteins, inhibiting apoptosis and maintaining the structural integrity of the sarcomere and regulation of nuclear receptors. Furthermore, we discuss emerging evidence of increased expression of extracellular HSP70, HSP90 and BAG-3 in heart failure, with complementary independent roles from intracellular functions with important therapeutic and diagnostic considerations. While our understanding of these major HSPs in heart failure is incomplete, there is a clear potential role for therapeutic modulation of HSPs in heart failure with important contextual considerations to counteract the imbalance of protein damage and endogenous protein quality control systems.This article is part of the theme issue 'Heat shock proteins as modulators and therapeutic targets of chronic disease: an integrated perspective'.
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Affiliation(s)
- Mark J Ranek
- Division of Cardiology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
| | - Marisa J Stachowski
- Department of Cell and Molecular Physiology, Stritch School of Medicine, Loyola University, Chicago, IL 60302, USA
| | - Jonathan A Kirk
- Department of Cell and Molecular Physiology, Stritch School of Medicine, Loyola University, Chicago, IL 60302, USA
| | - Monte S Willis
- Department of Pathology and Laboratory Medicine, McAllister Heart Institute, CB#7525, Chapel Hill, NC 27599-7525, USA
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27
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Kiselev A, Vaz R, Knyazeva A, Khudiakov A, Tarnovskaya S, Liu J, Sergushichev A, Kazakov S, Frishman D, Smolina N, Pervunina T, Jorholt J, Sjoberg G, Vershinina T, Rudenko D, Arner A, Sejersen T, Lindstrand A, Kostareva A. De novo mutations in FLNC
leading to early-onset restrictive cardiomyopathy and congenital myopathy. Hum Mutat 2018; 39:1161-1172. [DOI: 10.1002/humu.23559] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 05/22/2018] [Accepted: 05/30/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Artem Kiselev
- Almazov National Medical Research Centre; Saint Petersburg Russia
| | - Raquel Vaz
- Department of Molecular Medicine and Surgery and Center for molecular medicine; Karolinska Institutet; Stockholm Sweden
| | | | | | - Svetlana Tarnovskaya
- Almazov National Medical Research Centre; Saint Petersburg Russia
- Peter the Great St.Petersburg Polytechnic University; Saint Petersburg Russia
| | - Jiao Liu
- Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
| | | | | | - Dmitrij Frishman
- Peter the Great St.Petersburg Polytechnic University; Saint Petersburg Russia
- Department of Bioinformatics; Technische Universität München; Wissenschaftszentrum Weihenstephan; Freising Germany
| | - Natalia Smolina
- Almazov National Medical Research Centre; Saint Petersburg Russia
- ITMO University; Saint Petersburg Russia
- Department of Women's and Children's Health and Center for Molecular Medicine; Karolinska Institute; Stockholm Sweden
| | | | - John Jorholt
- Department of Women's and Children's Health and Center for Molecular Medicine; Karolinska Institute; Stockholm Sweden
| | - Gunnar Sjoberg
- Department of Women's and Children's Health and Center for Molecular Medicine; Karolinska Institute; Stockholm Sweden
| | | | | | - Anders Arner
- Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
| | - Thomas Sejersen
- Department of Women's and Children's Health and Center for Molecular Medicine; Karolinska Institute; Stockholm Sweden
| | - Anna Lindstrand
- Department of Molecular Medicine and Surgery and Center for molecular medicine; Karolinska Institutet; Stockholm Sweden
- Clinical Genetics; Karolinska University Laboratory; Karolinska University Hospital; Stockholm Sweden
| | - Anna Kostareva
- Almazov National Medical Research Centre; Saint Petersburg Russia
- Department of Women's and Children's Health and Center for Molecular Medicine; Karolinska Institute; Stockholm Sweden
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28
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Schänzer A, Rupp S, Gräf S, Zengeler D, Jux C, Akintürk H, Gulatz L, Mazhari N, Acker T, Van Coster R, Garvalov BK, Hahn A. Dysregulated autophagy in restrictive cardiomyopathy due to Pro209Leu mutation in BAG3. Mol Genet Metab 2018; 123:388-399. [PMID: 29338979 DOI: 10.1016/j.ymgme.2018.01.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 01/02/2018] [Accepted: 01/02/2018] [Indexed: 12/13/2022]
Abstract
Myofibrillary myopathies (MFM) are hereditary myopathies histologically characterized by degeneration of myofibrils and aggregation of proteins in striated muscle. Cardiomyopathy is common in MFM but the pathophysiological mechanisms are not well understood. The BAG3-Pro209Leu mutation is associated with early onset MFM and severe restrictive cardiomyopathy (RCM), often necessitating heart transplantation during childhood. We report on a young male patient with a BAG3-Pro209Leu mutation who underwent heart transplantation at eight years of age. Detailed morphological analyses of the explanted heart tissue showed intracytoplasmic inclusions, aggregation of BAG3 and desmin, disintegration of myofibers and Z-disk alterations. The presence of undegraded autophagosomes, seen by electron microscopy, as well as increased levels of p62, LC3-I and WIPI1, detected by immunohistochemistry and western blot analyses, indicated a dysregulation of autophagy. Parkin and PINK1, proteins involved in mitophagy, were slightly increased whereas mitochondrial OXPHOS activities were not altered. These findings indicate that altered autophagy plays a role in the pathogenesis and rapid progression of RCM in MFM caused by the BAG3-Pro209Leu mutation, which could have implications for future therapeutic strategies.
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Affiliation(s)
- A Schänzer
- Institute of Neuropathology, Justus Liebig University Giessen, 35392 Giessen, Germany.
| | - S Rupp
- Pediatric Heart Center, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - S Gräf
- Institute of Neuropathology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - D Zengeler
- Center for Genomics and Transcriptomics (CeGat) GmbH, 72076 Tübingen, Germany
| | - C Jux
- Pediatric Heart Center, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - H Akintürk
- Pediatric Heart Center, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - L Gulatz
- Institute of Neuropathology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - N Mazhari
- Pediatric Heart Center, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - T Acker
- Institute of Neuropathology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - R Van Coster
- Division of Child Neurology, Department of Pediatrics, University Hospital Gent, 9000 Gent, Belgium
| | - B K Garvalov
- Institute of Neuropathology, Justus Liebig University Giessen, 35392 Giessen, Germany; Department of Microvascular Biology and Pathobiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Medical Faculty Mannheim, University of Heidelberg, 68167 Mannheim, Germany
| | - A Hahn
- Department of Child Neurology, Justus Liebig University Giessen, 35392 Giessen, Germany
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29
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Myers VD, McClung JM, Wang J, Tahrir FG, Gupta MK, Gordon J, Kontos CH, Khalili K, Cheung JY, Feldman AM. The Multifunctional Protein BAG3: A Novel Therapeutic Target in Cardiovascular Disease. JACC Basic Transl Sci 2018; 3:122-131. [PMID: 29938246 PMCID: PMC6013050 DOI: 10.1016/j.jacbts.2017.09.009] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The B-cell lymphoma 2–associated anthanogene (BAG3) protein is expressed most prominently in the heart, the skeletal muscle, and in many forms of cancer. In the heart, it serves as a co-chaperone with heat shock proteins in facilitating autophagy; binds to B-cell lymphoma 2, resulting in inhibition of apoptosis; attaches actin to the Z disk, providing structural support for the sarcomere; and links the α-adrenergic receptor with the L-type Ca2+ channel. When BAG3 is overexpressed in cancer cells, it facilitates prosurvival pathways that lead to insensitivity to chemotherapy, metastasis, cell migration, and invasiveness. In contrast, in the heart, mutations in BAG3 have been associated with a variety of phenotypes, including both hypertrophic/restrictive and dilated cardiomyopathy. In murine skeletal muscle and vasculature, a mutation in BAG3 leads to critical limb ischemia after femoral artery ligation. An understanding of the biology of BAG3 is relevant because it may provide a therapeutic target in patients with both cardiac and skeletal muscle disease.
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Affiliation(s)
- Valerie D Myers
- Department of Medicine, Division of Cardiology, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Joseph M McClung
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, North Carolina
| | - JuFang Wang
- Center for Translational Medicine, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Farzaneh G Tahrir
- Department of Neuroscience, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Manish K Gupta
- Department of Neuroscience, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Jennifer Gordon
- Department of Neuroscience, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Christopher H Kontos
- Department of Medicine, Division of Cardiology, Duke University School of Medicine, Durham, North Carolina
| | - Kamel Khalili
- Department of Neuroscience, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Joseph Y Cheung
- Department of Medicine, Division of Cardiology, Lewis Katz School of Medicine, Philadelphia, Pennsylvania.,Center for Translational Medicine, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
| | - Arthur M Feldman
- Department of Medicine, Division of Cardiology, Lewis Katz School of Medicine, Philadelphia, Pennsylvania
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30
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Okeke E, Dokun AO. Role of genetics in peripheral arterial disease outcomes; significance of limb-salvage quantitative locus-1 genes. Exp Biol Med (Maywood) 2017; 243:190-197. [PMID: 29199462 DOI: 10.1177/1535370217743460] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Peripheral artery disease is a major health care problem with significant morbidity and mortality. Humans with peripheral artery disease exhibit two major and differential clinical manifestations - intermittent claudication and critical limb ischemia. Individuals with intermittent claudication or critical limb ischemia have overlapping risk factors and objective measures of blood flow. Hence, we hypothesized that variation in genetic make-up may be an important determinant in the severity of peripheral artery disease. Previous studies have identified polymorphism in genes, contributing to extent of atherosclerosis but much less is known about polymorphisms associated with genes that can influence peripheral artery disease severity. This review outlines some of the progress made up-to-date to unravel the molecular mechanisms underlining differential peripheral artery disease severity. By exploring the recovery phenotype of different mouse strains following experimental peripheral artery disease, our group identified the limb salvage-associated quantitative trait locus 1 on mouse chromosome 7 as the first genetic modifier of perfusion recovery and tissue necrosis phenotypes. Furthermore, a number of genes within LSq-1, such as ADAM12, IL-21Rα, and BAG3 were identified as genetic modifiers of peripheral artery disease severity that function through preservation of endothelial and skeletal muscle cells during ischemia. Taken together, these studies suggest manipulation of limb salvage-associated quantitative trait locus 1 genes show great promise as therapeutic targets in the management of peripheral artery disease. Impact statement Peripheral artery disease (PAD) is a major health care problem with significant morbidity and mortality. Individuals with similar atherosclerosis burden do display different severity of disease. This review outlines some of the progress made up-to-date in unraveling the molecular mechanisms underlining differential PAD severity with a focus on the role of the Limb Salvage-associated Quantitative trait locus 1 (LSq-1), a key locus in adaptation to ischemia in PAD.
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Affiliation(s)
- Emmanuel Okeke
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, 12325 University of Tennessee Health Sciences Center , Memphis, TN 38163, USA
| | - Ayotunde O Dokun
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, 12325 University of Tennessee Health Sciences Center , Memphis, TN 38163, USA
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31
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Role of BAG3 in cancer progression: A therapeutic opportunity. Semin Cell Dev Biol 2017; 78:85-92. [PMID: 28864347 DOI: 10.1016/j.semcdb.2017.08.049] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/26/2017] [Accepted: 08/28/2017] [Indexed: 02/06/2023]
Abstract
BAG3 is a multifunctional protein that can bind to heat shock proteins (Hsp) 70 through its BAG domain and to other partners through its WW domain, proline-rich (PXXP) repeat and IPV (Ile-Pro-Val) motifs. Its intracellular expression can be induced by stressful stimuli, while is constitutive in skeletal muscle, cardiac myocytes and several tumour types. BAG3 can modulate the levels, localisation or activity of its partner proteins, thereby regulating major cell pathways and functions, including apoptosis, autophagy, mechanotransduction, cytoskeleton organisation, motility. A secreted form of BAG3 has been identified in studies on pancreatic ductal adenocarcinoma (PDAC). Secreted BAG3 can bind to a specific receptor, IFITM2, expressed on macrophages, and induce the release of factors that sustain tumour growth and the metastatic process. BAG3 neutralisation therefore appears to constitute a novel potential strategy in the therapy of PDAC and, possibly, other tumours.
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32
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Stürner E, Behl C. The Role of the Multifunctional BAG3 Protein in Cellular Protein Quality Control and in Disease. Front Mol Neurosci 2017; 10:177. [PMID: 28680391 PMCID: PMC5478690 DOI: 10.3389/fnmol.2017.00177] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 05/18/2017] [Indexed: 01/01/2023] Open
Abstract
In neurons, but also in all other cells the complex proteostasis network is monitored and tightly regulated by the cellular protein quality control (PQC) system. Beyond folding of newly synthesized polypeptides and their refolding upon misfolding the PQC also manages the disposal of aberrant proteins either by the ubiquitin-proteasome machinery or by the autophagic-lysosomal system. Aggregated proteins are primarily degraded by a process termed selective macroautophagy (or aggrephagy). One such recently discovered selective macroautophagy pathway is mediated by the multifunctional HSP70 co-chaperone BAG3 (BCL-2-associated athanogene 3). Under acute stress and during cellular aging, BAG3 in concert with the molecular chaperones HSP70 and HSPB8 as well as the ubiquitin receptor p62/SQSTM1 specifically targets aggregation-prone proteins to autophagic degradation. Thereby, BAG3-mediated selective macroautophagy represents a pivotal adaptive safeguarding and emergency system of the PQC which is activated under pathophysiological conditions to ensure cellular proteostasis. Interestingly, BAG3-mediated selective macroautophagy is also involved in the clearance of aggregated proteins associated with age-related neurodegenerative disorders, like Alzheimer’s disease (tau-protein), Huntington’s disease (mutated huntingtin/polyQ proteins), and amyotrophic lateral sclerosis (mutated SOD1). In addition, based on its initial description BAG3 is an anti-apoptotic protein that plays a decisive role in other widespread diseases, including cancer and myopathies. Therefore, in the search for novel therapeutic intervention avenues in neurodegeneration, myopathies and cancer BAG3 is a promising candidate.
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Affiliation(s)
- Elisabeth Stürner
- Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg University MainzMainz, Germany
| | - Christian Behl
- Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg University MainzMainz, Germany
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33
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Rigid spine syndrome associated with sensory-motor axonal neuropathy resembling Charcot-Marie-Tooth disease is characteristic of Bcl-2-associated athanogene-3
gene mutations even without cardiac involvement. Muscle Nerve 2017; 57:330-334. [DOI: 10.1002/mus.25631] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2017] [Indexed: 01/07/2023]
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34
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Klimek C, Kathage B, Wördehoff J, Höhfeld J. BAG3-mediated proteostasis at a glance. J Cell Sci 2017; 130:2781-2788. [DOI: 10.1242/jcs.203679] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
ABSTRACT
Cellular and organismal survival depend on the ability to maintain the proteome, even under conditions that threaten protein integrity. BCL2-associated athanogene 3 (BAG3) is essential for protein homeostasis (proteostasis) in stressed cells. Owing to its multi-domain structure, it engages in diverse processes that are crucial for proteome maintenance. BAG3 promotes the activity of molecular chaperones, sequesters and concentrates misfolded proteins, initiates autophagic disposal, and balances transcription, translation and degradation. In this Cell Science at a Glance article and the accompanying poster, we discuss the functions of this multi-functional proteostasis tool with a focus on mechanical stress protection and describe the importance of BAG3 for human physiology and pathophysiology.
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Affiliation(s)
- Christina Klimek
- Institute for Cell Biology, University of Bonn, Ulrich-Haberland-Str. 61a, D-53121 Bonn, Germany
| | - Barbara Kathage
- Institute for Cell Biology, University of Bonn, Ulrich-Haberland-Str. 61a, D-53121 Bonn, Germany
| | - Judith Wördehoff
- Institute for Cell Biology, University of Bonn, Ulrich-Haberland-Str. 61a, D-53121 Bonn, Germany
| | - Jörg Höhfeld
- Institute for Cell Biology, University of Bonn, Ulrich-Haberland-Str. 61a, D-53121 Bonn, Germany
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35
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Exome sequencing identifies variants in two genes encoding the LIM-proteins NRAP and FHL1 in an Italian patient with BAG3 myofibrillar myopathy. J Muscle Res Cell Motil 2016; 37:101-15. [PMID: 27443559 PMCID: PMC5010835 DOI: 10.1007/s10974-016-9451-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 07/09/2016] [Indexed: 11/06/2022]
Abstract
Myofibrillar myopathies (MFMs) are genetically heterogeneous dystrophies characterized by the disintegration of Z-disks and myofibrils and are associated with mutations in genes encoding Z-disk or Z-disk-related proteins. The c.626 C > T (p.P209L) mutation in the BAG3 gene has been described as causative of a subtype of MFM. We report a sporadic case of a 26-year-old Italian woman, affected by MFM with axonal neuropathy, cardiomyopathy, rigid spine, who carries the c.626 C > T mutation in the BAG3 gene. The patient and her non-consanguineous healthy parents and brother were studied with whole exome sequencing (WES) to further investigate the genetic basis of this complex phenotype. In the patient, we found that the BAG3 mutation is associated with variants in the NRAP and FHL1 genes that encode muscle-specific, LIM domain containing proteins. Quantitative real time PCR, immunohistochemistry and Western blot analysis of the patient’s muscular biopsy showed the absence of NRAP expression and FHL1 accumulation in aggregates in the affected skeletal muscle tissue. Molecular dynamic analysis of the mutated FHL1 domain showed a modification in its surface charge, which could affect its capability to bind its target proteins. To our knowledge this is the first study reporting, in a BAG3 MFM, the simultaneous presence of genetic variants in the BAG3 and FHL1 genes (previously described as independently associated with MFMs) and linking the NRAP gene to MFM for the first time.
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Insight into muscle physiology through understanding mechanisms of muscle pathology. J Muscle Res Cell Motil 2015; 36:359-61. [PMID: 26671444 PMCID: PMC4762911 DOI: 10.1007/s10974-015-9437-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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