Ocular dysfunction in a mouse model of chronic gut inflammation

Area of Science:

• Ophthalmology
• Gastroenterology
• Immunology

Background:

• Ocular disease is a known extraintestinal manifestation in a subset of inflammatory bowel disease (IBD) patients.
• The pathogenic mechanisms underlying this distant organ inflammatory response remain unclear.
• This study investigates the link between colitis and ocular dysfunction in a preclinical model.

Purpose of the Study:

• To investigate the ocular manifestations in a T-cell transfer model of chronic colitis in mice.
• To determine the relationship between colonic inflammation and retinal function, blood flow, and oxygenation.
• To explore potential mechanisms linking IBD to eye disease.

Main Methods:

• Utilized a T-cell transfer model of chronic colitis in mice.
• Assessed colonic inflammation, ocular function via electroretinography, and retinal blood flow using intravital microscopy.
• Measured intraocular pressure and quantified retinal hypoxia using a hypoxia-dependent probe.

Main Results:

• Colitic mice exhibited significantly impaired ocular function, including decreased retinal b-wave amplitudes and delayed oscillatory potentials.
• Retinal blood flow was markedly reduced in colitic mice, correlating with decreased hematocrit and diminished oxygen delivery to the eye.
• Severe colitis was associated with increased retinal hypoxia and reduced intraocular pressure.

Conclusions:

• Ocular disease, characterized by retinal dysfunction, occurs in a mouse model of chronic colitis.
• Retinal dysfunction appears linked to insufficient perfusion and subsequent oxygen deprivation.
• Findings suggest a potential mechanism for ocular complications in inflammatory bowel disease.