Key result
Throughout the lifespan of the mdx mouse, dystrophic slow-twitch soleus muscle is no more susceptible to eccentric contraction-induced injury than age-matched littermate controls.
Why the study?
It was proposed that branched fibers weaken dystrophic muscle during eccentric contractions, prompting study of contractile function and branching in slow-twitch soleus muscle across the mdx lifespan.
Population
Slow-twitch soleus muscle from dystrophic mdx mice across 2-3 wk, 6-9 wk, and 58-112 wk
Comparison
Dystrophic mdx soleus muscle vs age-matched littermate controls
Authors
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Slow-twitch resilience in mdx models may refine fiber-type DMD research; leaves open human translation and therapeutic targeting.
In the mdx mouse model of DMD, slow-twitch soleus muscles are protected from eccentric contraction-induced injury compared to fast-twitch muscles, correlating with fewer branched fibers.
Kiriaev et al. (2021) studied Duchenne muscular dystrophy (mdx mouse model). Dystrophin-negative slow-twitch soleus muscle vs. Age-matched littermate controls was evaluated on Susceptibility to eccentric contraction-induced injury and fiber branching. Throughout the lifespan of the mdx mouse, dystrophic slow-twitch soleus muscle is no more susceptible to eccentric contraction-induced injury than age-matched littermate controls.
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