Current Issues in Molecular Biology (Sep 2021)

Signaling Pathway of Histamine H<sub>1</sub> Receptor-Mediated Histamine H<sub>1</sub> Receptor Gene Upregulation Induced by Histamine in U-373 MG Cells

  • Hiroyuki Mizuguchi,
  • Yuko Miyamoto,
  • Takuma Terao,
  • Haruka Yoshida,
  • Wakana Kuroda,
  • Yoshiaki Kitamura,
  • Noriaki Takeda,
  • Hiroyuki Fukui

DOI
https://doi.org/10.3390/cimb43030088
Journal volume & issue
Vol. 43, no. 3
pp. 1243 – 1254

Abstract

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Histamine H1 receptor (H1R) is one of the targets of histamine in the nervous system and the peripheral tissues. Protein kinase Cδ (PKCδ) signaling is involved in histamine-induced upregulation of H1R gene expression in HeLa cells. Histamine also upregulates H1R gene expression in U-373 MG cells. However, the molecular signaling of this upregulation is still unclear. Here, we investigated the molecular mechanism of histamine-induced H1R gene upregulation in U-373 MG cells. Histamine-induced H1R gene upregulation was inhibited by H1R antagonist d-chlorpheniramine, but not by ranitidine, ciproxifan, or JNJ77777120, and H2R, H3R, or H4R antagonists, respectively. Ro-31-8220 and Go6976 also suppressed this upregulation, however, the PKCδ selective inhibitor rottlerin and the PKCβ selective inhibitor Ly333531 did not. Time-course studies showed distinct kinetics of H1R gene upregulation in U-373 MG cells from that in HeLa cells. A promoter assay revealed that the promoter region responsible for H1R gene upregulation in U-373 MG cells was different from that of HeLa cells. These data suggest that the H1R-activated H1R gene expression signaling pathway in U-373 MG cells is different from that in HeLa cells, possibly by using different promoters. The involvement of PKCα also suggests that compounds that target PKCδ could work as peripheral type H1R-selective inhibitors without a sedative effect.

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