1. Effects of β2-agonists and exercise on β2-adrenergic receptor signaling in skeletal muscles
- Author
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Kaoru Tachiyashiki, Takako Kizaki, Shogo Sato, Hideki Ohno, Kazuhiko Imaizumi, and Ken Shirato
- Subjects
Beta-3 adrenergic receptor ,medicine.medical_specialty ,sports doping ,exercise ,Physiology ,Chemistry ,β2 agonists ,Skeletal muscle ,Alpha-1A adrenergic receptor ,β2 adrenergic receptor ,medicine.anatomical_structure ,Endocrinology ,Internal medicine ,β2-adrenergic receptor signaling ,Sports medicine ,medicine ,QP1-981 ,skeletal muscle ,β2-agonist clenbuterol ,RC1200-1245 - Abstract
In this review, we discuss the anabolic and metabolic responses of skeletal muscles to β2-agonists and exercise. β2-agonists increase muscle mass, particularly in fast-twitch muscles. Exercise positively regulates glucose homeostasis, mitochondrial biogenesis, and metabolic enzyme levels in skeletal muscles; whereas treatment with β2-agonists attenuates these beneficial effects. This review also describes the role of β2-adrenergic receptor (β2-AR) signaling molecules, such as cyclic adenosine monophosphate response element-binding protein, mitogen-activated protein kinase, and Akt/protein kinase B, in the response of skeletal muscles to β2-agonist treatment and exercise. For example, β2-agonists and exercise increase the phosphorylation of p38 mitogen-activated protein kinase in slow-twitch muscles. Our interpretation of these findings is that β2-adrenergic receptor signaling plays a functional role in the anabolic and metabolic responses of skeletal muscles to β2-agonists and exercise.
- Published
- 2012