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Dis Model Mech. 2018 Nov 5. pii: dmm.036137. doi: 10.1242/dmm.036137. [Epub ahead of print]

Muscle strength deficiency and mitochondrial dysfunction in a muscular dystrophy model of C. elegans and its functional response to drugs.

Author information

1
Department of Chemical Engineering, Texas Tech University, Lubbock, TX, USA.
2
MRC/ARUK Centre for Musculoskeletal Ageing Research, Royal Derby Hospital, University of Nottingham & National Institute for Health Research Nottingham Biomedical Research Centre, Derby, UK.
3
Sport and Health Sciences, University of Exeter, St Luke's Campus, Exeter, EX1 2LU, UK.
4
Lancaster Medical School, Furness College, Lancaster University, Lancaster, LA1 4YG, UK.
5
MRC/ARUK Centre for Musculoskeletal Ageing Research, Royal Derby Hospital, University of Nottingham & National Institute for Health Research Nottingham Biomedical Research Centre, Derby, UK siva.vanapalli@ttu.edu nathaniel.szewczyk@nottingham.ac.uk.
6
Department of Chemical Engineering, Texas Tech University, Lubbock, TX, USA siva.vanapalli@ttu.edu nathaniel.szewczyk@nottingham.ac.uk.

Abstract

Muscle strength is a key clinical parameter used to monitor the progression of human muscular dystrophies including Duchenne and Becker muscular dystrophies. Although Caenorhabditis elegans is an established genetic model for studying mechanisms and treatments of muscular dystrophies, analogous strength-based measurements in this disease model are lacking. Here we describe the first demonstration of the direct measurement of muscular strength in dystrophin-deficient C. elegans mutants using a micropillar-based force measurement system called NemaFlex. We show that dys-1(eg33) mutants, but not dys-1(cx18) mutants, are significantly weaker than their wild-type counterparts in early adulthood, cannot thrash in liquid at wild-type rates, and display mitochondrial network fragmentation in the body wall muscles as well as abnormally high baseline mitochondrial respiration. Furthermore, treatment with prednisone, the standard treatment for muscular dystrophy in humans, and melatonin both improve muscular strength, thrashing rate, and mitochondrial network integrity in dys-1(eg33), and prednisone treatment also returns baseline respiration to normal levels. Thus, our results demonstrate that the dys-1(eg33) strain is more clinically relevant than dys-1(cx18) for muscular dystrophy studies in C. elegans This finding in combination with the novel NemaFlex platform can be used as an efficient workflow for identifying candidate compounds that can improve strength in the C. elegans muscular dystrophy model. Our study also lays the foundation for further probing of the mechanism of muscle function loss in dystrophin-deficient C. elegans, leading to knowledge translatable to human muscular dystrophy.

KEYWORDS:

C. elegans; Melatonin; Muscle strength; Muscular dystrophy; Prednisone

PMID:
30396907
DOI:
10.1242/dmm.036137
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