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• W2111567195 abstract "Abstract Background During rat development, histamine (HA) is one of the first neuroactive molecules to appear in the brain, reaching its maximal value at embryonic day 14, a period when neurogenesis of deep layers is occurring in the cerebral cortex, suggesting a role of this amine in neuronal specification. We previously reported, using high-density cerebrocortical neural precursor cultures, that micromolar HA enhanced the effect of fibroblast growth factor (FGF)-2 on proliferation, and that HA increased neuronal differentiation, due to HA type 1 receptor (H 1 R) activation. Results Clonal experiments performed here showed that HA decreased colony size and caused a significant increase in the percentage of clones containing mature neurons through H 1 R stimulation. In proliferating precursors, we studied whether HA activates G protein-coupled receptors linked to intracellular calcium increases. Neural cells presented an increase in cytoplasmic calcium even in the absence of extracellular calcium, a response mediated by H 1 R. Since FGF receptors (FGFRs) are known to be key players in cell proliferation and differentiation, we determined whether HA modifies the expression of FGFRs1-4 by using RT-PCR. An important transcriptional increase in FGFR1 was elicited after H 1 R activation. We also tested whether HA promotes differentiation specifically to neurons with molecular markers of different cortical layers by immunocytochemistry. HA caused significant increases in cells expressing the deep layer neuronal marker FOXP2; this induction of FOXP2-positive neurons elicited by HA was blocked by the H 1 R antagonist chlorpheniramine in vitro . Finally, we found a notable decrease in FOXP2+ cortical neurons in vivo , when chlorpheniramine was infused in the cerebral ventricles through intrauterine injection. Conclusion These results show that HA, by activating H 1 R, has a neurogenic effect in clonal conditions and suggest that intracellular calcium elevation and transcriptional up-regulation of FGFR1 participate in HA-induced neuronal differentiation to FOXP2 cells in vitro ; furthermore, H 1 R blockade in vivo resulted in decreased cortical FOXP2+ neurons." @default.
• W2111567195 created "2016-06-24" @default.
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• W2111567195 date "2013-03-07" @default.
• W2111567195 modified "2023-10-16" @default.
• W2111567195 title "Histamine up-regulates fibroblast growth factor receptor 1 and increases FOXP2 neurons in cultured neural precursors by histamine type 1 receptor activation: conceivable role of histamine in neurogenesis during cortical development in vivo" @default.
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• W2111567195 doi "https://doi.org/10.1186/1749-8104-8-4" @default.
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