Brain Advance Access published online on November 16, 2008
Brain, doi:10.1093/brain/awn289
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Cyclosporine A treatment for Ullrich congenital muscular dustrophy: a cellular study of mitochondrial dysfunction and its rescue
1Institute of Human Genetics, Newcastle University, Newcastle upon Tyne, UK, 2INSERM, U582, Institut de Myologie, 3UPMC Univ Paris 06, UMR_S582, IFR14, Paris, France, 4Dubowitz Neuromuscular Centre, UCL Institute of Child Health, London, UK, 5Friedrich-Baur-Institute, Department of Neurology, Ludwig-Maximilians-University, Munich, Germany, 6Assistance Publique Hôpitaux de Paris, Service de Pédiatrie, Hôpital Raymond Poincaré, Garches and 7Assistance Publique Hôpitaux de Paris, Groupe Hospitalier Pitié-Salpêtrière, UF Cardiogénétique et Myogénétique, Service de Biochimie Métabolique, Paris, France
Correspondence to:
Prof. K Bushby, Institute of Human Genetics, International Centre for Life, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK E-mail: kate.bushby{at}ncl.ac.uk
Mutations in COL6A1, COL6A2 and COL6A3, the genes which encode the extra-cellular matrix component collagen VI, lead to Bethlem myopathy and Ullrich congenital muscular dystrophy (UCMD). Although the Col6a1–/– null mouse has an extremely mild neuromuscular phenotype, a mitochondrial defect has been demonstrated, linked to dysregulation of the mitochondrial permeability transition pore (PTP) opening. This finding has been replicated in UCMD muscle cells in culture, providing justification for a clinical trial using cyclosporine A, an inhibitor of PTP opening. We investigated whether PTP dysregulation could be detected in UCMD fibroblasts (the predominant source of muscle collagen VI), in myoblast cells from patients with other diseases and its response to rescue agents other than collagen VI. Although we confirm the presence of PTP dysregulation in muscle-derived cultures from two UCMD patients, fibroblasts from the same patients and the majority of fibroblasts from other well-characterized UCMD patients behave normally. PTP dysregulation is found in limb girdle muscular dystrophy (LGMD) type 2B myoblasts but not in myoblasts from patients with Bethlem myopathy, merosin-deficient congenital muscular dystrophy, LGMD2A, Duchenne muscular dystrophy and Leigh syndrome. In addition to rescue by cyclosporine A and collagen VI, this cellular phenotype was also rescued by other extra-cellular matrix constituents (laminin and collagen I). As the muscle derived cultures demonstrating PTP dysregulation shared poor growth in culture and lack of desmin labelling, we believe that PTP dysregulation may be a particular characteristic of the state of these cells in culture and is not specific to the collagen VI defect, and can in any case be rescued by a range of extra-cellular matrix components. Further work is needed on the relationship of PTP dysregulation with UCMD pathology.
Key Words: Muscular dystrophy; MPTP; extracellular matrix; Membrane Potential; mitochondria
Abbreviations: BM, Bethlem myopathy; CsA, cyclosporine A; ECM, extra-cellular matrix; LGMD, limb girdle muscular dystrophy; MDC1A, merosin-deficient congenital muscular dystrophy type 1A; PTP, permeability transition pore; TMRM, tetramethyl rhodamine methyl ester; UCMD, Ullrich congenital muscular dystrophy.
Received June 2, 2008. Revised September 9, 2008. Accepted October 8, 2008.
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