Succinylated chitosan derivative has local protective effects on intestinal inflammation

Area of Science:

• Biochemistry
• Immunology
• Gastroenterology

Background:

• Chitosan derivatives are known for anti-inflammatory properties.
• Zwitterionic chitosan (ZWC) is a water-soluble derivative with potential therapeutic applications.

Purpose of the Study:

• To investigate the hypothesis that orally administered ZWC exerts local anti-inflammatory effects within the intestinal lumen.
• To evaluate the efficacy of ZWC in preventing and treating intestinal inflammation.

Main Methods:

• In vitro studies using peritoneal macrophages, THP1 monocytes, and Caco-2 cells challenged with lipopolysaccharide (LPS).
• In vivo studies involving prophylactic oral administration of ZWC in mice subjected to 2,4,6-trinitrobenzene sulphonic acid (TNBS)-induced colitis and LPS-induced systemic inflammation.

Main Results:

• ZWC exhibited anti-inflammatory effects in vitro, particularly when pre-applied to Caco-2 cells before LPS challenge.
• Oral ZWC administration protected mice from TNBS-induced colitis, improving body weight, colon appearance, and promoting FoxP3+ T cell generation.
• ZWC did not protect against LPS-induced systemic inflammation, suggesting limited upper gastrointestinal absorption.

Conclusions:

• Orally administered ZWC acts locally in the colon with minimal systemic absorption.
• ZWC shows promise as a therapeutic agent for localized intestinal inflammatory conditions like colitis.