Key result
Nebulin deficiency in mice led to a 40% reduction in specific maximal force production and a 45% reduction in muscle volume, but improved fatigue resistance due to a slower contractile phenotype.
Why the study?
The conditional nebulin knockout mouse is a new model mimicking nemaline myopathy, prompting investigation of the in vivo impact of nebulin deficiency on muscle function.
Does nebulin deficiency affect muscle function and anatomy in vivo in a mouse model of nemaline myopathy?
Does nebulin deficiency affect muscle function and anatomy in vivo in a mouse model of nemaline myopathy?
In a mouse model of nemaline myopathy, nebulin deficiency leads to severe muscle atrophy and weakness but improves fatigue resistance due to a slower contractile phenotype.
Nebulin loss impairs force and volume yet aids fatigue resistance in mice; leaves open human nemaline myopathy mechanisms and therapies.
INTRODUCTION: The conditional nebulin knockout mouse is a new model mimicking nemaline myopathy, a rare disease characterized by muscle weakness and rods within muscle fibers. We investigated the impact of nebulin (NEB) deficiency on muscle function in vivo. METHODS: Conditional nebulin knockout mice and control littermates were studied at 10 to 12 months. Muscle function (force and fatigue) and anatomy (muscles volume and fat content) were measured in vivo. Myosin heavy chain (MHC) composition and nebulin (NEB) protein expression were assessed by protein electrophoresis. RESULTS: Conditional nebulin knockout mice displayed a lower NEB level (-90%) leading to a 40% and 45% reduction in specific maximal force production and muscles volume, respectively. Nebulin deficiency was also associated with higher resistance to fatigue and increased MHC I content. DISCUSSION: Adult nebulin-deficient mice displayed severe muscle atrophy and weakness in vivo related to a low NEB content but an improved fatigue resistance due to a slower contractile phenotype.
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Gineste et al. (2020) studied Nemaline myopathy. Conditional nebulin knockout vs. Control littermates was evaluated on Muscle function (force and fatigue) and anatomy (muscles volume and fat content). Nebulin deficiency in mice led to a 40% reduction in specific maximal force production and a 45% reduction in muscle volume, but improved fatigue resistance due to a slower contractile phenotype.
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