Abstract
We discuss the functional roles of β2-adrenergic receptors in skeletal muscle hypertrophy and atrophy, as well as the adaptive responses of β2-adrenergic receptor expression to anabolic and catabolic conditions. Stimulation of the β2-adrenergic receptor using anabolic drugs increases muscle mass by promoting muscle protein synthesis and/or attenuating protein degradation. These effects are prevented by the downregulation of the receptor. Endurance training improves oxidative performance, partly by increasing β2-adrenergic receptor density in exercise-recruited slow-twitch muscles. However, excessive stimulation of β2-adrenergic receptors negates their beneficial effects. Although preventive effects of β2-adrenergic receptor stimulation on atrophy induced by muscle disuse and catabolic hormones or drugs were observed, these catabolic conditions decreased β2-adrenergic receptor expression in slow-twitch muscles. These findings present evidence against the use of β2-adrenergic agonists in therapy for muscle wasting and weakness. Thus, β2-adrenergic receptors in the skeletal muscles play an important physiological role in the regulation of protein and energy balance.
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Sato, S., Shirato, K., Mitsuhashi, R., Suzuki, H., Tachiyashiki, K., Imaizumi, K. (2015). Functional Roles of β2-Adrenergic Receptors in Skeletal Muscle Hypertrophy and Atrophy. In: Kanosue, K., Oshima, S., Cao, ZB., Oka, K. (eds) Physical Activity, Exercise, Sedentary Behavior and Health. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55333-5_18
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