Histamine modulates microglia function.

Journal of Neuroinflammation
Raquel FerreiraLiliana Bernardino

Abstract

Histamine is commonly acknowledged as an inflammatory mediator in peripheral tissues, leaving its role in brain immune responses scarcely studied. Therefore, our aim was to uncover the cellular and molecular mechanisms elicited by this molecule and its receptors in microglia-induced inflammation by evaluating cell migration and inflammatory mediator release. Firstly, we detected the expression of all known histamine receptor subtypes (H1R, H2R, H3R and H4R), using a murine microglial cell line and primary microglia cell cultures from rat cortex, by real-time PCR analysis, immunocytochemistry and Western blotting. Then, we evaluated the role of histamine in microglial cell motility by performing scratch wound assays. Results were further confirmed using murine cortex explants. Finally, interleukin-1beta (IL-1β) and tumor necrosis factor-alpha (TNF-α) levels were evaluated by ELISA measurements to determine the role of histamine on the release of these inflammatory mediators. After 12 h of treatment, 100 μM histamine and 10 μg/ml histamine-loaded poly (lactic-co-glycolic acid) microparticles significantly stimulated microglia motility via H4R activation. In addition, migration involves α5β1 integrins, and p38 and Akt signaling pa...Continue Reading

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Methods Mentioned

BETA
motility assay
ELISA
PCR
electrophoresis
scanning electron microscopy
Enzyme-linked
confocal microscopy
Enzyme-linked Immunosorbent Assay

Software Mentioned

NIH ImageJ
GraphPad
GraphPad Prism
MetaFluor
Biorad iQ5

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