Intrauterine growth restriction alters postnatal colonic barrier maturation in rats

Area of Science:

• Gastroenterology
• Developmental Biology
• Perinatal Medicine

Background:

• Intrauterine growth restriction (IUGR) is a significant cause of infant mortality and morbidity.
• IUGR is linked to an increased risk of necrotizing enterocolitis and potential long-term intestinal issues.
• Mucins and trefoil factor family 3 (TFF3) are crucial for maintaining the integrity and healing of the gut epithelium.

Purpose of the Study:

• To investigate the impact of IUGR on the maturation of the colonic mucosa.
• To determine if IUGR affects the expression of mucins and TFF3 in the developing colon.

Main Methods:

• IUGR was induced in pregnant rats via dietary protein restriction.
• Colonic mucosa maturation, mucin, and TFF3 expression were analyzed during postnatal development.
• Quantitative analysis included mRNA and protein levels, crypt depth, and crypt fission rates.

Main Results:

• Rats with IUGR exhibited reduced mucin 2 and TFF3 protein levels before weaning.
• Post-weaning, IUGR was associated with lower mucin 2 (mRNA and protein) and mucin 4 (mRNA) expression.
• IUGR led to reduced colonic crypt depth and an increased percentage of crypts in fission.

Conclusions:

• IUGR significantly impairs the development of the colonic mucus barrier.
• Long-term alterations in mucin expression are a consequence of IUGR.
• The compromised colonic barrier in IUGR may predispose individuals to both neonatal and adult colonic injury.