Key result
Nebulin knock-out muscle fibers exhibited increased tension cost (5.9 vs 4.4 pmol/mN/mm/s) and reduced rate of tension re-development (4.7 vs 7.3 s-1) compared to wild type.
Why the study?
Does nebulin knock-out alter cross-bridge cycling kinetics and thin filament activation in skeletal muscle?
Does nebulin knock-out alter cross-bridge cycling kinetics and thin filament activation in skeletal muscle?
Nebulin increases thin filament activation and alters cross-bridge cycling kinetics to increase force and efficiency of contraction, providing a mechanism for muscle weakness in nemaline myopathy.
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Nebulin deficiency impairs contraction efficiency in animal models; leaves open whether thin-filament targeting alters weakness in human nemaline myopathy.
Chandra et al. (2009) studied this question. Nebulin knock-out (NEB KO) vs. Wild type was evaluated on Tension cost, rate of tension re-development, calcium sensitivity, and cooperativity of activation. Nebulin knock-out muscle fibers exhibited increased tension cost (5.9 vs 4.4 pmol/mN/mm/s) and reduced rate of tension re-development (4.7 vs 7.3 s-1) compared to wild type.
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