Lung and intestine: a specific link in an ulcerative colitis rat model

Area of Science:

• Gastroenterology and Pulmonology
• Immunology
• Pathology

Background:

• Ulcerative colitis (UC) is an inflammatory bowel disease with potential systemic effects.
• The relationship between intestinal inflammation and lung pathology is not fully understood.
• Investigating shared mechanisms in UC models can provide insights into multiorgan damage.

Purpose of the Study:

• To explore the link and underlying mechanisms between the intestine and lung in a rat model of ulcerative colitis.
• To analyze inflammatory markers and microvascular responses in both colon and lung tissues.

Main Methods:

• Established a UC rat model using immunological sensitization and 2,4,6-trinitrobenzene sulfonic acid (TNBS) enema.
• Assessed general condition, body weight, and performed histological and functional analyses of colon, lung, liver, and kidney.
• Quantified expression of iNOS, TXB2, P-selectin, ICAM-1, and VEGF-A in colon and lung tissues.

Main Results:

• UC rats exhibited pulmonary dysfunction (ventilator disorder) and interstitial pneumonia.
• No significant changes were observed in liver or kidney function and histopathology.
• Significantly elevated levels of iNOS, TXB2, P-selectin, ICAM-1, and VEGF-A were found in both colon and lung tissues of UC rats.

Conclusions:

• This study demonstrates a significant association between the large intestine and lung in the TNBS-induced UC rat model.
• Shared pathological specificities may arise in organs with common embryonic origins during disease.
• Findings offer a novel perspective on multiorgan damage in complex clinical diseases like UC.