Differences in Intestinal Barrier Development between Intrauterine Growth Restricted and Normal Birth Weight Piglets

Area of Science:

• Veterinary Pathology
• Developmental Biology
• Gastroenterology

Background:

• Intrauterine growth restriction (IUGR) in piglets results in low birth weight and compromised intestinal function, leading to high mortality.
• The gut barrier and immune functions in IUGR are not well understood.
• Early postnatal gut mucosal changes in IUGR piglets require detailed investigation.

Purpose of the Study:

• To microscopically evaluate early postnatal changes in the gut mucosa of IUGR piglets.
• To compare the development of gut barrier and immune structures between IUGR and normal piglets.
• To determine the timeline of gut maturation and recovery in IUGR piglets.

Main Methods:

• Small intestine samples from littermate IUGR and normal piglets were collected on postnatal days 7, 14, and 180.
• Light microscopy was used to analyze intraepithelial leukocytes, goblet cells, and Peyer's patches.
• Histological parameters were compared between IUGR and control groups at different developmental stages.

Main Results:

• IUGR piglets showed reduced intraepithelial leukocytes in the duodenum on day 7 but increased levels in the jejunum on days 7 and 14, suggesting inflammation.
• Goblet cell numbers were reduced in IUGR piglets by day 14.
• Peyer's patch size was reduced in IUGR piglets on day 7 but normalized by day 14; no differences were observed at day 180.

Conclusions:

• IUGR pig neonates exhibit retarded development of gut barrier and immune structures in the first week of life.
• These developmental deficits in the gut mucosa of IUGR piglets show significant recovery within the second postnatal week.
• Long-term histological differences in the gut were not apparent by day 180 in IUGR piglets compared to normal littermates.