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Hypothyroidism is associated with increased myostatin expression in rats
I Carneiro1, I Castro-Piedras, A Muñoz
1Department of Physiology, University of Santiago de Compostela, Santiago de Compostela, Spain.
Journal of Endocrinological Investigation
|November 11, 2008
Summary
Thyroid hormone status influences myostatin expression. Hypothyroidism increases myostatin mRNA and protein, suggesting a role in muscle loss associated with low thyroid function.
Area of Science:
- Endocrinology
- Muscle Physiology
- Molecular Biology
Background:
- Myostatin regulates muscle growth and homeostasis, with expression increasing during muscle atrophy.
- Thyroid status significantly impacts muscle physiology.
- Thyroid hormone response elements are present in the myostatin promoter region.
Purpose of the Study:
- To investigate the role of thyroid hormones in regulating myostatin gene expression.
- To determine if hypothyroidism or hyperthyroidism affects myostatin levels.
Main Methods:
- Adult male rats were induced into hypothyroid (aminotriazole) or hyperthyroid (L-T4) states.
- Myostatin mRNA and protein levels were measured in rat muscle tissue.
- C2C12 myoblast cells were treated with thyroid hormones in vitro.
Main Results:
- Hypothyroid rats exhibited increased myostatin mRNA and protein compared to controls.
- Hyperthyroid rats showed no significant change in myostatin mRNA levels.
- Thyroid hormone treatment of C2C12 cells promoted differentiation but did not alter myostatin mRNA.
Conclusions:
- Myostatin expression is elevated in hypothyroid states.
- These findings suggest myostatin may contribute to muscle loss observed in hypothyroidism.
- Thyroid hormones do not directly upregulate myostatin expression in this context.
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