Variable cytoplasmic actin expression impacts the sensitivity of different dystrophin‐deficientmdxskeletal muscles to eccentric contraction

Autor:	Dawn A. Lowe, Angus Lindsay, James M. Ervasti, James S. Hodges, Alexie A. Larson, William M. Southern, Preston M. McCourt
Rok vydání:	2019
Předmět:	Male 0301 basic medicine Utrophin genetic structures animal diseases Duchenne muscular dystrophy Muscle Fibers Skeletal Biochemistry Article Dystrophin Mice 03 medical and health sciences 0302 clinical medicine Myosin medicine Animals Eccentric Molecular Biology Cells Cultured Intermediate Fiber Myosin Heavy Chains biology Chemistry Skeletal muscle Cell Biology musculoskeletal system medicine.disease Actins Cell biology Mice Inbred C57BL Calcium ATPase stomatognathic diseases 030104 developmental biology medicine.anatomical_structure 030220 oncology & carcinogenesis Mice Inbred mdx biology.protein tissues Muscle Contraction
Zdroj:	FEBS J
ISSN:	1742-4658 1742-464X
Popis:	Eccentric contractions (ECCs) induce force loss in several skeletal muscles of dystrophin-deficient mice (mdx), with the exception of the soleus (Sol). The eccentric force : isometric force (ECC : ISO), expression level of utrophin, fiber type distribution, and sarcoendoplasmic reticulum calcium ATPase expression are factors that differ between muscles and may contribute to the sensitivity of mdx skeletal muscle to ECC. Here, we confirm that the Sol of mdx mice loses only 13% force compared to 87% in the extensor digitorum longus (EDL) following 10 ECC of isolated muscles. The Sol has a greater proportion of fibers expressing Type I myosin heavy chain (MHC) and expresses 2.3-fold more utrophin compared to the EDL. To examine the effect of ECC : ISO, we show that the mdx Sol is insensitive to ECC at ECC : ISO up to 230 ± 15%. We show that the peroneus longus (PL) muscle presents with similar ECC : ISO compared to the EDL, intermediate force loss (68%) following 10 ECC, and intermediate fiber type distribution and utrophin expression relative to EDL and Sol. The combined absence of utrophin and dystrophin in mdx/utrophin-/- mice rendered the Sol only partially susceptible to ECC and exacerbated force loss in the EDL and PL. Most interestingly, the expression levels of cytoplasmic β- and γ-actins correlate inversely with a given muscle's sensitivity to ECC; EDL
Databáze:	OpenAIRE
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