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Influences of desmin and keratin 19 on passive biomechanical properties of mouse skeletal muscle. | LitMetric

Influences of desmin and keratin 19 on passive biomechanical properties of mouse skeletal muscle.

J Biomed Biotechnol

Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA.

Published: June 2012

AI Article Synopsis

Article Abstract

In skeletal muscle fibers, forces must be transmitted between the plasma membrane and the intracellular contractile lattice, and within this lattice between adjacent myofibrils. Based on their prevalence, biomechanical properties and localization, desmin and keratin intermediate filaments (IFs) are likely to participate in structural connectivity and force transmission. We examined the passive load-bearing response of single fibers from the extensor digitorum longus (EDL) muscles of young (3 months) and aged (10 months) wild-type, desmin-null, K19-null, and desmin/K19 double-null mice. Though fibers are more compliant in all mutant genotypes compared to wild-type, the structural response of each genotype is distinct, suggesting multiple mechanisms by which desmin and keratin influence the biomechanical properties of myofibers. This work provides additional insight into the influences of IFs on structure-function relationships in skeletal muscle. It may also have implications for understanding the progression of desminopathies and other IF-related myopathies.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3263816PMC
http://dx.doi.org/10.1155/2012/704061DOI Listing

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