Abstract Title:

Hypothalamic orexin stimulates feeding-associated glucose utilization in skeletal muscle via sympathetic nervous system.

Abstract Source:

Cell Metab. 2009 Dec ;10(6):466-80. PMID: 19945404

Abstract Author(s):

Tetsuya Shiuchi, Mohammad Shahidul Haque, Shiki Okamoto, Tsuyoshi Inoue, Haruaki Kageyama, Suni Lee, Chitoku Toda, Atsushi Suzuki, Eric S Bachman, Young-Bum Kim, Takashi Sakurai, Masashi Yanagisawa, Seiji Shioda, Keiji Imoto, Yasuhiko Minokoshi

Article Affiliation:

Division of Endocrinology and Metabolism, Department of Developmental Physiology, National Institute for Physiological Sciences, Okazaki, Aichi 444-8585, Japan.

Abstract:

Hypothalamic neurons containing orexin (hypocretin) are activated during motivated behaviors and active waking. We show that injection of orexin-A into the ventromedial hypothalamus (VMH) of mice or rats increased glucose uptake and promoted insulin-induced glucose uptake and glycogen synthesis in skeletal muscle, but not in white adipose tissue, by activating the sympathetic nervous system. These effects of orexin were blunted in mice lacking beta-adrenergic receptors but were restored by forced expression of the beta(2)-adrenergic receptor in both myocytes and nonmyocyte cells of skeletal muscle. Orexin neurons are activated by conditioned sweet tasting and directly excite VMH neurons, thereby increasing muscle glucose metabolism and its insulin sensitivity. Orexin and its receptor in VMH thus play a key role in the regulation of muscle glucose metabolism associated with highly motivated behavior by activating muscle sympathetic nerves and beta(2)-adrenergic signaling.

Study Type : Animal Study
Additional Links
Problem Substances : Insulin : CK(149) : AC(23)

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