Abstract
The orexins and their cognate G-protein coupled receptors have been widely studied due to their associations with various behaviors and cellular processes. However, the detailed downstream signaling cascades that mediate these effects are not completely understood. We report the generation of a neuronal model cell line that stably expresses the OX1 orexin receptor (OX1) and an RNA-Seq analysis of changes in gene expression seen upon receptor activation. Upon treatment with orexin, several families of related transcription factors are transcriptionally regulated, including the early growth response genes (Egr), the Kruppel-like factors (Klf), and the Nr4a subgroup of nuclear hormone receptors. Furthermore, some of the transcriptional effects observed have also been seen in data from in vivo sleep deprivation microarray studies, supporting the physiological relevance of the data set. Additionally, inhibition of one of the most highly regulated genes, serum and glucocorticoid-regulated kinase 1 (Sgk1), resulted in the diminished orexin-dependent induction of a subset of genes. These results provide new insight into the molecular signaling events that occur during OX1 signaling and support a role for orexin signaling in the stimulation of wakefulness during sleep deprivation studies.
Highlights
We report the generation of a neuronal model cell line that stably expresses the OX1 orexin receptor (OX1) and an RNA-Seq analysis of changes in gene expression seen upon receptor activation
Because the orexin system has been shown to regulate behavior primarily via its actions in the central nervous system, studying orexin receptor signaling in a neuronal context is of particular interest
A recombinant model stably expressing OX1 was generated in GT1-7 cells, a mouse cell line derived from gonadotropin releasing hormone (GnRH)-expressing neurons of the hypothalamus
Summary
The orexin system has been shown to influence several biological processes including appetite [1,2,3], wakefulness [4,5,6,7,8,9,10], reward behaviors [11,12,13,14,15,16,17,18], and energy metabolism [19,20,21,22,23,24]. In addition to efforts demonstrating the behavioral effects of the orexin system, a number of studies have addressed the intracellular molecular signaling events that occur in response to orexin receptor activation [26,27,28,29,30]. Upon ligand binding, these receptors can couple to various.
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