Key result
Repetitive stimulation of rat skeletal muscle increased LC2 phosphate content from 0.21 to 0.51 mol phosphate/mol LC2, which positively correlated with potentiation of peak twitch tension.
Why the study?
Does repetitive stimulation or isoproterenol alter LC2 phosphorylation in rat skeletal muscle?
Population
Rat fast-twitch (extensor digitorum longus) and slow-twitch (soleus) skeletal muscles
Comparison
Repetitive stimulation at 23 and 35 degrees C… vs Baseline/unstimulated state or different…
Design
Preclinical
Authors
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LC2 phosphorylation dynamics in rat skeletal muscle are temperature-independent; leaves open translation to cardiac myosin regulation or clinical relevance.
Does repetitive stimulation or isoproterenol alter LC2 phosphorylation in rat skeletal muscle?
Absolute Event Rate: 0.51% vs 0.21%
LC2 phosphorylation increases with repetitive stimulation in rat skeletal muscle and correlates with peak twitch tension potentiation, suggesting a physiological role.
Manning et al. (1982) studied this question. Repetitive stimulation and isoproterenol incubation was evaluated on LC2 phosphate content. Repetitive stimulation of rat skeletal muscle increased LC2 phosphate content from 0.21 to 0.51 mol phosphate/mol LC2, which positively correlated with potentiation of peak twitch tension.
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