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Pancreatic α-cells secrete glucagon to maintain energy homeostasis. Although histamine has an important role in energy homeostasis, the expression and function of histamine receptors in pancreatic α-cells remains unknown. We found that the histamine H3 receptor (H3R) was expressed in mouse pancreatic α-cells and αTC1.6 cells, a mouse pancreatic α-cell line. H3R inhibited glucagon secretion from αTC1.6 cells by inhibiting an increase in intracellular Ca(2+) concentration. We also found that immepip, a selective H3R agonist, decreased serum glucagon concentration in rats. These results suggest that H3R modulates glucagon secretion from pancreatic α-cells.
The dysregulation of monoamine clearance in the central nervous system occurs in various neuropsychiatric disorders, and the role of polyspecific monoamine transporters in monoamine clearance is increasingly highlighted in recent studies. However, no study to date has properly characterized polyspecific monoamine transporters in the mouse brain. In the present study, we examined the kinetic properties of three mouse polyspecific monoamine transporters [organic cation transporter 2 (Oct2), Oct3, and plasma membrane monoamine transporter (Pmat)] and compared the absolute mRNA expression levels of these transporters in various brain areas. First, we evaluated the affinities of each transporter for noradrenaline, dopamine, serotonin, and histamine, and found that mouse ortholog substrate affinities were similar to those of human orthologs. Next, we performed drug inhibition assays and identified interspecies differences in the pharmacological properties of polyspecific monoamine transporters; in particular, corticosterone and decynium-22, which are widely recognized as typical inhibitors of human OCT3, enhanced the transport activity of mouse Oct3. Finally, we quantified absolute mRNA expression levels of each transporter in various regions of the mouse brain and found that while all three transporters were ubiquitously expressed, Pmat was the most highly expressed transporter. These results provide an important foundation for future translational research investigating the roles of polyspecific monoamine transporters in neurological and neuropsychiatric disease.
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