Developmental programming of bone deficits in growth-restricted offspring

Area of Science:

• Bone Biology
• Developmental Origins of Health and Disease (DOHaD)

Background:

• Emerging evidence suggests a link between low birth weight and compromised adult bone health.
• Uteroplacental insufficiency during gestation is a known cause of fetal growth restriction.

Purpose of the Study:

• To investigate the long-term effects of uteroplacental insufficiency on bone development and strength in rats.
• To characterize gender-specific skeletal changes from weaning through adulthood.

Main Methods:

• Uteroplacental insufficiency was induced in pregnant rats via bilateral uterine vessel ligation.
• Offspring bone characteristics (size, mineral content, density, strength) were assessed using quantitative computed tomography (pQCT) at multiple time points.
• Bone strength was evaluated using the stress-strain index (SSI).

Main Results:

• Restricted offspring exhibited reduced femur length and bone mineral content compared to controls.
• Trabecular bone content was lower in restricted rats, while cortical bone content and density were reduced, particularly in females.
• Stress-strain index (SSI) indicated significantly lower bone strength in restricted males and females across various ages, with some deficits worsening over time.

Conclusions:

• Uteroplacental insufficiency during gestation results in persistent skeletal deficits in offspring.
• Observed bone impairments display distinct gender-specific patterns and can be exacerbated by aging.
• These findings highlight the critical impact of early-life nutrition and development on long-term bone health.