Development of wheat-sensitive enteropathy in Irish Setters: biochemical changes

Area of Science:

• Veterinary Medicine
• Gastroenterology
• Canine Health

Background:

• Naturally acquired wheat-sensitive enteropathy affects Irish Setters, causing intestinal issues.
• Distinguishing primary biochemical defects from secondary effects of intestinal damage is crucial for understanding the condition.

Purpose of the Study:

• To investigate biochemical changes in the small intestine of Irish Setters with wheat-sensitive enteropathy.
• To differentiate primary biochemical abnormalities from secondary consequences of intestinal damage caused by dietary wheat.

Main Methods:

• Comparison of affected progeny on wheat-containing vs. cereal-free diets with healthy controls.
• Sequential peroral jejunal biopsies from weaning to 1 year of age.
• Analysis of specific activity and distribution of organelle marker enzymes.

Main Results:

• No major primary biochemical abnormalities were detected in affected dogs.
• Affected dogs fed wheat showed a selective loss of brush border alkaline phosphatase and aminopeptidase N activities.
• This loss was linked to villus atrophy but was specific to dietary wheat, as other brush border enzymes remained unaffected.

Conclusions:

• The observed brush border enzyme loss is a secondary effect of dietary wheat, not a primary defect.
• Dietary wheat specifically impacts brush border enzymes in Irish Setters with enteropathy.
• Lysosomal and peroxisomal enzyme alterations may occur secondary to mucosal damage late in the disease.