1
|
Finsterer J, Stöllberger C, Maeztu C. Sudden cardiac death in neuromuscular disorders. Int J Cardiol 2016; 203:508-15. [DOI: 10.1016/j.ijcard.2015.10.176] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/25/2015] [Accepted: 10/24/2015] [Indexed: 12/31/2022]
|
2
|
Kostera-Pruszczyk A, Suszek M, Płoski R, Franaszczyk M, Potulska-Chromik A, Pruszczyk P, Sadurska E, Karolczak J, Kamińska AM, Rędowicz MJ. BAG3-related myopathy, polyneuropathy and cardiomyopathy with long QT syndrome. J Muscle Res Cell Motil 2015; 36:423-32. [PMID: 26545904 PMCID: PMC4762926 DOI: 10.1007/s10974-015-9431-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Accepted: 10/28/2015] [Indexed: 12/14/2022]
Abstract
BAG3 belongs to BAG family of molecular chaperone regulators interacting with HSP70 and anti-apoptotic protein Bcl-2. It is ubiquitously expressed with strong expression in skeletal and cardiac muscle, and is involved in a panoply of cellular processes. Mutations in BAG3 and aberrations in its expression cause fulminant myopathies, presenting with progressive limb and axial muscle weakness, and respiratory insufficiency and neuropathy. Herein, we report a sporadic case of a 15-years old girl with symptoms of myopathy, demyelinating polyneuropathy and asymptomatic long QT syndrome. Genetic testing demonstrated heterozygous mutation Pro209Leu (c.626C > T) in exon 3 of BAG3 gene causing severe myopathy and neuropathy, often associated with restrictive cardiomyopathy. We did not find a mutation in any known LQT syndrome genes. Analysis of muscle biopsy revealed profound disintegration of Z-discs with extensive accumulation of granular debris and large inclusions within fibers. We demonstrated profound alterations in BAG3 distribution as the protein localized to long filamentous structures present across the fibers that were positively stained not only for α-actinin but also for desmin and filamin indicating that those disintegrated Z-disc regions contained also other sarcomeric proteins. The mutation caused a decrease in the content of BAG3 and HSP70, and also of α-actinin desmin, filamin and fast myosin heavy chain, confirming its severe effect on the muscle fiber morphology and thus function. We provide further evidence that BAG3 is associated with Z-disc maintenance, and the Pro209Leu mutation may occur worldwide. We also provide a summary of cases associated with this mutation reported so far.
Collapse
Affiliation(s)
- Anna Kostera-Pruszczyk
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097, Warsaw, Poland
| | - Małgorzata Suszek
- Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland
| | - Rafał Płoski
- Department of Medical Genetics, Medical University of Warsaw, 3c Pawińskiego St., 02-106, Warsaw, Poland
| | - Maria Franaszczyk
- Laboratory of Molecular Biology, Institute of Cardiology, 42 Alpejska St., 04-628, Warsaw, Poland
| | - Anna Potulska-Chromik
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097, Warsaw, Poland
| | - Piotr Pruszczyk
- Department of Internal Medicine and Cardiology with the Center for Diagnosis and Treatment of Venous Thromboembolism, Medical University of Warsaw, 4 Lindleya St., 02-005, Warsaw, Poland
| | - Elżbieta Sadurska
- Department of Pediatric Cardiology, Medical University of Lublin, Chodźki 2, 20-093, Lublin, Poland
| | - Justyna Karolczak
- Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland
| | - Anna M Kamińska
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097, Warsaw, Poland
| | - Maria Jolanta Rędowicz
- Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland.
| |
Collapse
|
3
|
Faksh A, Codsi E, Barsoum MK, Brost BC. Pregnancy in Desmin-Related Cardiomyopathy. AJP Rep 2015; 5:e165-7. [PMID: 26495177 PMCID: PMC4603864 DOI: 10.1055/s-0035-1555130] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Accepted: 05/14/2015] [Indexed: 02/03/2023] Open
Abstract
The course of desmin-related restrictive cardiomyopathy (DRCM) during pregnancy has not been described previously because of the rarity of the condition. Following an episode of heart failure antecedent to conception, a 28-year-old primigravida with DRCM presented to establish prenatal care during the first trimester. Prenatal management consisted of β-blocker and diuretic therapy, with serial echocardiography to monitor cardiac function. Spontaneous labor ensued at 39 weeks' gestation, and vacuum-assisted delivery was performed for fetal indication. Postpartum blood transfusion was required for symptomatic anemia because of uterine atony, and subsequent maternal and neonatal courses were uncomplicated. Cardiac evaluation postpartum demonstrated stable maternal status. Pregnancy in women with controlled DRCM is not contraindicated, however, it requires careful planning and monitoring during the antenatal, intrapartum, and postpartum periods. On the basis of this report, pregnancy does not appear to exert a permanent deleterious effect on cardiac function in women with DRCM.
Collapse
Affiliation(s)
- Arij Faksh
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota
| | - Elisabeth Codsi
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota
| | - Michel K Barsoum
- Department of Cardiology, Mayo Clinic Health System, Eau Claire, Wisconsin
| | - Brian C Brost
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota
| |
Collapse
|
4
|
Desminopathies: pathology and mechanisms. Acta Neuropathol 2013; 125:47-75. [PMID: 23143191 PMCID: PMC3535371 DOI: 10.1007/s00401-012-1057-6] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2012] [Revised: 10/15/2012] [Accepted: 10/18/2012] [Indexed: 12/22/2022]
Abstract
The intermediate filament protein desmin is an essential component of the extra-sarcomeric cytoskeleton in muscle cells. This three-dimensional filamentous framework exerts central roles in the structural and functional alignment and anchorage of myofibrils, the positioning of cell organelles and signaling events. Mutations of the human desmin gene on chromosome 2q35 cause autosomal dominant, autosomal recessive, and sporadic myopathies and/or cardiomyopathies with marked phenotypic variability. The disease onset ranges from childhood to late adulthood. The clinical course is progressive and no specific treatment is currently available for this severely disabling disease. The muscle pathology is characterized by desmin-positive protein aggregates and degenerative changes of the myofibrillar apparatus. The molecular pathophysiology of desminopathies is a complex, multilevel issue. In addition to direct effects on the formation and maintenance of the extra-sarcomeric intermediate filament network, mutant desmin affects essential protein interactions, cell signaling cascades, mitochondrial functions, and protein quality control mechanisms. This review summarizes the currently available data on the epidemiology, clinical phenotypes, myopathology, and genetics of desminopathies. In addition, this work provides an overview on the expression, filament formation processes, biomechanical properties, post-translational modifications, interaction partners, subcellular localization, and functions of wild-type and mutant desmin as well as desmin-related cell and animal models.
Collapse
|