Effects of maternal undernutrition on lung growth and insulin-like growth factor system expression in rat offspring

Area of Science:

• Developmental biology
• Endocrinology
• Pulmonology

Background:

• Maternal undernutrition during gestation can significantly affect fetal development.
• The lung's structural and functional development may be influenced by nutritional status during critical prenatal periods.

Purpose of the Study:

• To investigate the impact of maternal undernutrition on the expression of the insulin-like growth factor (IGF) system in rat offspring's lungs.
• To understand the developmental regulation of lung IGF system components in response to intrauterine growth restriction (IUGR).

Main Methods:

• Pregnant rats were subjected to undernutrition (50% of control intake) during the final week of gestation.
• Lung tissue from offspring was analyzed for the expression of IGF-I, IGF-II, IGF receptors (IGFR-1, IGFR-2), and IGF binding protein (IGFBP) mRNA at various postnatal ages.

Main Results:

• Intrauterine growth restriction (IUGR) resulted in lower body and lung weights in offspring compared to controls.
• Maternal undernutrition significantly increased lung IGF-I and IGF-II mRNA expression on postnatal days 1 and 28.
• Lung IGFR-1, IGFR-2, and IGFBP mRNA expression showed similar developmental patterns in both control and IUGR rats.

Conclusions:

• The study provides a detailed analysis of the lung IGF system's expression during postnatal development in control and IUGR rats.
• Maternal undernutrition alters specific components of the lung IGF system, highlighting its role in developmental programming.