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Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Immunology

Background:

  • Reg family proteins are implicated in gastrointestinal (GI) inflammation.
  • The precise role and regulation of Reg family protein overexpression in GI pathophysiology remain unclear.

Purpose of the Study:

  • Investigate Reg family gene expression in a colitis model.
  • Elucidate the regulation of Reg IIIβ and Reg IIIγ in inflamed colonic mucosa.
  • Examine the role of STAT3-associated cytokines in Reg protein expression.

Main Methods:

  • Dextran sulfate sodium (DSS)-induced colitis model in C57BL/6 mice.
  • Real-time RT-PCR for gene expression analysis (Reg family, IL-6, IL-17, IL-22).
  • Immunohistochemistry for Reg IIIβ/γ expression.
  • Western blot analysis of STAT3 phosphorylation and HIP/PAP expression in Caco2 and HCT116 cells.

Main Results:

  • Reg IIIβ and Reg IIIγ were significantly overexpressed in DSS-induced colitis tissues.
  • Expression of IL-6, IL-17, and IL-22 correlated significantly with Reg IIIβ/γ levels.
  • IL-6, IL-17, and IL-22 stimulation enhanced STAT3 phosphorylation and HIP/PAP expression in intestinal cell lines.

Conclusions:

  • Reg IIIβ and Reg IIIγ overexpression is linked to STAT3-associated cytokines in colitis.
  • This interplay plays a crucial role in the pathophysiology of DSS-induced colitis.
  • Findings provide insights into the molecular mechanisms of inflammatory bowel disease.