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Bittel AJ, Sreetama SC, Bittel DC, Horn A, Novak JS, Yokota T, Zhang A, Maruyama R, Rowel Q. Lim K, Jaiswal JK, Chen YW. Membrane Repair Deficit in Facioscapulohumeral Muscular Dystrophy. Int J Mol Sci 2020; 21:ijms21155575. [PMID: 32759720 PMCID: PMC7432481 DOI: 10.3390/ijms21155575] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 07/28/2020] [Accepted: 07/30/2020] [Indexed: 12/14/2022] Open
Abstract
Deficits in plasma membrane repair have been identified in dysferlinopathy and Duchenne Muscular Dystrophy, and contribute to progressive myopathy. Although Facioscapulohumeral Muscular Dystrophy (FSHD) shares clinicopathological features with these muscular dystrophies, it is unknown if FSHD is characterized by plasma membrane repair deficits. Therefore, we exposed immortalized human FSHD myoblasts, immortalized myoblasts from unaffected siblings, and myofibers from a murine model of FSHD (FLExDUX4) to focal, pulsed laser ablation of the sarcolemma. Repair kinetics and success were determined from the accumulation of intracellular FM1-43 dye post-injury. We subsequently treated FSHD myoblasts with a DUX4-targeting antisense oligonucleotide (AON) to reduce DUX4 expression, and with the antioxidant Trolox to determine the role of DUX4 expression and oxidative stress in membrane repair. Compared to unaffected myoblasts, FSHD myoblasts demonstrate poor repair and a greater percentage of cells that failed to repair, which was mitigated by AON and Trolox treatments. Similar repair deficits were identified in FLExDUX4 myofibers. This is the first study to identify plasma membrane repair deficits in myoblasts from individuals with FSHD, and in myofibers from a murine model of FSHD. Our results suggest that DUX4 expression and oxidative stress may be important targets for future membrane-repair therapies.
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Affiliation(s)
- Adam J. Bittel
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
| | - Sen Chandra Sreetama
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
| | - Daniel C. Bittel
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
| | - Adam Horn
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
| | - James S. Novak
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
- Department of Genomics and Precision Medicine, The George Washington University School of Medicine and Health Science, 111 Michigan Ave NW, Washington, DC 20010, USA
| | - Toshifumi Yokota
- Department of Medical Genetics, University of Alberta, 116 St. & 85 Ave., Edmonton, AB T6G 2R3, Canada; (T.Y.); (R.M.); (K.R.Q.L.)
| | - Aiping Zhang
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
| | - Rika Maruyama
- Department of Medical Genetics, University of Alberta, 116 St. & 85 Ave., Edmonton, AB T6G 2R3, Canada; (T.Y.); (R.M.); (K.R.Q.L.)
| | - Kenji Rowel Q. Lim
- Department of Medical Genetics, University of Alberta, 116 St. & 85 Ave., Edmonton, AB T6G 2R3, Canada; (T.Y.); (R.M.); (K.R.Q.L.)
| | - Jyoti K. Jaiswal
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
- Department of Integrative Systems Biology, Institute for Biomedical Sciences, The George Washington University, 2121 I St. NW, Washington, DC 20052, USA
- Correspondence: (J.K.J.); (Y.-W.C.)
| | - Yi-Wen Chen
- Research Center for Genetic Medicine, Children’s National Hospital, 111 Michigan Ave NW, Washington, DC 20010, USA; (A.J.B.); (S.C.S.); (D.C.B.); (A.H.); (J.S.N.); (A.Z.)
- Department of Integrative Systems Biology, Institute for Biomedical Sciences, The George Washington University, 2121 I St. NW, Washington, DC 20052, USA
- Correspondence: (J.K.J.); (Y.-W.C.)
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