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- W1553695642 abstract "Histamine is a physiological amine which initiates a multitude of physiological responses by binding to four known G-protein coupled histamine receptor subtypes as follows: histamine H1 receptor (H1 R), H2 R, H3 R, and H4 R. Brain histamine elicits neuronal excitation and regulates a variety of physiological processes such as learning and memory, sleep-awake cycle and appetite regulation. Microglia, the resident macrophages in the brain, express histamine receptors; however, the effects of histamine on critical microglial functions such as chemotaxis, phagocytosis, and cytokine secretion have not been examined in primary cells. We demonstrated that mouse primary microglia express H2 R, H3 R, histidine decarboxylase, a histamine synthase, and histamine N-methyltransferase, a histamine metabolizing enzyme. Both forskolin-induced cAMP accumulation and ATP-induced intracellular Ca(2+) transients were reduced by the H3 R agonist imetit but not the H2 R agonist amthamine. H3 R activation on two ubiquitous second messenger signalling pathways suggests that H3 R can regulate various microglial functions. In fact, histamine and imetit dose-dependently inhibited microglial chemotaxis, phagocytosis, and lipopolysaccharide (LPS)-induced cytokine production. Furthermore, we confirmed that microglia produced histamine in the presence of LPS, suggesting that H3 R activation regulate microglial function by autocrine and/or paracrine signalling. In conclusion, we demonstrate the involvement of histamine in primary microglial functions, providing the novel insight into physiological roles of brain histamine." @default.
- W1553695642 created "2016-06-24" @default.
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- W1553695642 date "2015-03-10" @default.
- W1553695642 modified "2023-10-05" @default.
- W1553695642 title "Histamine H<sub>3</sub>receptor in primary mouse microglia inhibits chemotaxis, phagocytosis, and cytokine secretion" @default.
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- W1553695642 doi "https://doi.org/10.1002/glia.22812" @default.
- W1553695642 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25754956" @default.
- W1553695642 hasPublicationYear "2015" @default.
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