Intussusception in the Syrian golden hamster

Area of Science:

• Gastroenterology
• Animal Nutrition
• Comparative Pathology

Background:

• Dietary changes in laboratory animals can induce physiological alterations.
• Intussusception, a serious gastrointestinal condition, has been observed in hamsters.
• The role of specific dietary components in hamster intussusception is not fully understood.

Purpose of the Study:

• To investigate the cause of colocolic intussusception in Syrian hamsters fed a semi-purified diet.
• To examine the relationship between diet composition, gut morphology, and hormonal changes.
• To identify dietary factors that may prevent or trigger intussusception.

Main Methods:

• A cohort of 96 young male Syrian hamsters was studied.
• Diets were systematically altered, comparing a standard rodent chow to semi-purified diets with varying carbohydrate and fatty acid compositions.
• Clinical signs, histological examination of the colon, and plasma levels of gastrointestinal hormones (GIP, peptide tyrosine/tyrosine, enteroglucagon) were assessed.

Main Results:

• 13% of hamsters developed lethargy, anorexia, diarrhea, and colocolic intussusception after switching to a semi-purified diet.
• Histology revealed significantly reduced mucus production in the colons of affected hamsters.
• Plasma levels showed an 80% decrease in gastric inhibitory polypeptide (GIP) and significant increases in peptide tyrosine/tyrosine and enteroglucagon in hamsters with intussusception. Dietary fatty acids had no effect, but substituting starch for sucrose prevented intussusception.

Conclusions:

• Dietary semi-purified formulations, particularly those containing sucrose, can induce colocolic intussusception in Syrian hamsters.
• Reduced colonic mucus production and altered gut hormone profiles are associated with diet-induced intussusception.
• Dietary carbohydrate source (starch vs. sucrose) is a critical factor in preventing this condition.