Key result
Altered thyroid hormone levels significantly contribute to muscle phenotype transformation, with hypothyroidism favoring slower phenotypes and hyperthyroidism enhancing fast phenotypes.
Why the study?
Do altered thyroid hormone levels affect the expression of myosin heavy chain isoforms and muscle phenotype in rat skeletal muscles?
Population
Female inbred Lewis rats (control and regenerating soleus and extensor digitorum longus muscles)
Comparison
Altered thyroid hormone levels vs Euthyroid state
Design
Preclinical
Authors
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Thyroid hormone effects on muscle phenotype should not yet influence practice; leaves open translational relevance from this rat model.
Do altered thyroid hormone levels affect the expression of myosin heavy chain isoforms and muscle phenotype in rat skeletal muscles?
Thyroid hormone levels modulate the extent of muscle phenotype transformation in rat skeletal muscles, secondary to the primary role of innervation.
Vadászová et al. (2004) conducted a review in Altered thyroid status. Altered thyroid status (T3 administration or methimazole) vs. Euthyroid status was evaluated on Muscle fiber type and MyHC isoform composition. Altered thyroid hormone levels significantly contribute to muscle phenotype transformation, with hypothyroidism favoring slower phenotypes and hyperthyroidism enhancing fast phenotypes.
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