PMID: 11898002Mar 19, 2002Paper

Expression and function of histamine receptors 1 and 2 on human monocyte-derived dendritic cells

The Journal of Allergy and Clinical Immunology
Ralf GutzmerThomas Werfel

Abstract

Histamine is a well-known mediator of inflammatory and allergic reactions and has immunomodulatory capacities. There is increasing evidence that dendritic cells as professional antigen-presenting cells play a major role in the development of allergic reactions. However, a possible link between histamine and dendritic cells has not been investigated thus far. We investigated the effect of histamine on human monocyte-derived dendritic cells (MoDCs). Expression of histamine H1 and H2 receptors (H1R and H2R) on MoDCs was assessed by means of RT-PCR and flow cytometry. Functional exploration of these receptors was performed by monitoring the increase of intracellular calcium levels (H1R), cyclic adenosine monophosphate formation (H2R), F-actin polymerization, and IL-12p70 production. MoDCs express both H1R and H2R. Stimulation of dendritic cells with histamine resulted in F-actin polymerization and cyclic adenosine monophosphate production through H2R. Influx of calcium could not be detected after stimulation of dendritic cells with histamine under conditions in which histamine induced calcium influx in monocytes. Histamine and H1R and H2R agonists downregulated IL-12p70 production of prestimulated MoDCs. MoDCs express histamine H1 ...Continue Reading

Citations

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