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Histamine receptor H4 (H4R) on colon epithelial cells worsens colitis severity in mice. Blocking H4R on non-immune cells reduces inflammation and protects the gut barrier.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Pharmacology

Background:

  • The role of histamine and its receptors in intestinal inflammation is complex.
  • Histamine receptor subtype 4 (H4R) is implicated in immune cell function.
  • Its specific role in colon epithelial cells and barrier integrity remains unclear.

Purpose of the Study:

  • To investigate the role of H4R on colon epithelial cells in regulating epithelial barrier integrity.
  • To determine if H4R in non-hematopoietic cells exacerbates colitis.
  • To assess the functional expression of H4R in mouse colon epithelial cells.

Main Methods:

  • Dextran sodium sulfate (DSS)-induced acute colitis model in bone marrow-chimeric mice.
  • H4R knockout (H4R-/-) and wild-type (WT) BALB/cJ mice were used.
  • Gene expression analysis (RT-qPCR) and measurement of transepithelial electrical resistance (TEER) in epithelial monolayers.

Main Results:

  • Mice lacking H4R in non-hematopoietic cells showed reduced severity of DSS-induced colitis.
  • H4R mRNA was detected in colon epithelial cells.
  • H4R activation reduced TEER in colon epithelial monolayers, indicating impaired barrier function.

Conclusions:

  • H4R is functionally expressed on mouse colon epithelial cells.
  • H4R on non-hematopoietic cells aggravates DSS-induced colitis.
  • Histamine signaling via H4R negatively impacts epithelial barrier integrity in the colon.