Secreted glucose regulated protein78 ameliorates DSS-induced mouse colitis

Area of Science:

• Immunology
• Gastroenterology
• Molecular Biology

Background:

• Secreted 78-kDa glucose-regulated protein (sGRP78) is known for anti-inflammatory properties.
• Its role in colitis treatment remains largely unexplored.

Purpose of the Study:

• To investigate the expression pattern and therapeutic potential of sGRP78 in ulcerative colitis.
• To elucidate the mechanisms underlying sGRP78's effects on intestinal inflammation.

Main Methods:

• sGRP78 expression analysis in human and murine colitis samples.
• Administration of sGRP78 in DSS-induced colitis models.
• Assessment of intestinal integrity, immune cell infiltration, and cytokine production.
• Analysis of macrophage polarization and signaling pathways (TLR4, MAP-kinases, NF-κB).

Main Results:

• sGRP78 levels decreased during active colitis but rebounded during resolution.
• sGRP78 administration improved colitis symptoms, restored TJ integrity, and reduced immune cell infiltration and inflammatory cytokines.
• Cleavage of endogenous sGRP78 aggravated colitis.
• sGRP78 treatment modulated macrophage biology, inhibiting TLR4-dependent pathways and skewing polarization.

Conclusions:

• sGRP78 is a naturally occurring immunomodulatory molecule with therapeutic potential for acute intestinal inflammation.
• sGRP78 may represent a novel therapeutic agent for colitis by targeting macrophage-mediated inflammation.