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Orexin receptors 1 and 2 in serotonergic neurons differentially regulate peripheral glucose metabolism in obesity
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Orexin receptors 1 and 2 in serotonergic neurons differentially regulate peripheral glucose metabolism in obesity
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Journal Article
Orexin receptors 1 and 2 in serotonergic neurons differentially regulate peripheral glucose metabolism in obesity
2021
Overview
The wake-active orexin system plays a central role in the dynamic regulation of glucose homeostasis. Here we show orexin receptor type 1 and 2 are predominantly expressed in dorsal raphe nucleus-dorsal and -ventral, respectively. Serotonergic neurons in ventral median raphe nucleus and raphe pallidus selectively express orexin receptor type 1. Inactivation of orexin receptor type 1 in serotonin transporter-expressing cells of mice reduced insulin sensitivity in diet-induced obesity, mainly by decreasing glucose utilization in brown adipose tissue and skeletal muscle. Selective inactivation of orexin receptor type 2 improved glucose tolerance and insulin sensitivity in obese mice, mainly through a decrease in hepatic gluconeogenesis. Optogenetic activation of orexin neurons in lateral hypothalamus or orexinergic fibers innervating raphe pallidus impaired or improved glucose tolerance, respectively. Collectively, the present study assigns orexin signaling in serotonergic neurons critical, yet differential orexin receptor type 1- and 2-dependent functions in the regulation of systemic glucose homeostasis.
The wake-active orexin system plays a central role in the dynamic regulation of glucose homeostasis. Here the authors report that inactivation of the orexin receptor type 1 or 2 in serotonergic neurons differentially regulate systemic glucose homeostasis in the context of diet induced obesity.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
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/ Adipose Tissue, Brown - metabolism
/ Animals
/ Diet
/ Diet, High-Fat - adverse effects
/ Fibers
/ Glucose
/ Humanities and Social Sciences
/ Hypothalamic Area, Lateral - cytology
/ Hypothalamic Area, Lateral - metabolism
/ Insulin
/ Mice
/ Muscles
/ Neurons
/ Obesity
/ Orexin Receptors - metabolism
/ Orexins
/ Science
/ Serotonergic Neurons - metabolism
/ Serotonin Plasma Membrane Transport Proteins - genetics
