INTESTINAL DAMAGE AND IMMUNE RESPONSE AFTER EXPERIMENTAL BLUNT ABDOMINAL TRAUMA

Area of Science:

• Trauma research
• Immunology
• Gastroenterology

Background:

• Blunt abdominal trauma (AT) poses global health risks, with blast injuries increasing.
• Pathophysiology and immune responses in AT are poorly understood.
• Existing models lack comprehensive analysis of early intestinal effects.

Purpose of the Study:

• Investigate spatiotemporal effects of blast-induced blunt AT on the intestine.
• Analyze the innate immune response following blunt AT.
• Establish a reliable mouse model for AT research.

Main Methods:

• Used a standardized blast wave model on male C57Bl6 mice.
• Assessed intestinal injury via histology (Chiu score) and plasma markers (intestinal fatty acid-binding protein).
• Measured gut-blood barrier integrity (syndecan-1, claudin-5, mucin-2) and inflammatory cytokines (TNF, MIP-2).

Main Results:

• 36% of AT mice showed macroscopic intestinal injuries.
• Histology confirmed epithelial damage; elevated intestinal fatty acid-binding protein indicated enterocyte damage.
• Impaired gut-blood barrier and systemic immune activation (increased TNF, MIP-2) were observed early post-trauma.

Conclusions:

• Blast-induced blunt AT causes early intestinal damage and gut-blood barrier dysfunction.
• Elevated intestinal fatty acid-binding protein is an early indicator of enterocyte damage.
• The established mouse model is suitable for studying AT's immunopathophysiological consequences and testing therapeutics.