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Catch-up growth in the rat skull after retardation during the suckling period
Insights
Neonatal undernutrition impacts rat skull development differently by sex. Females recovered skull size and shape after rehabilitation, while males showed lasting width deficits.
Area of Science:
- Developmental biology
- Comparative anatomy
- Animal physiology
Background:
- Early life nutrition is crucial for growth and development.
- Skeletal development, particularly the skull, can be sensitive to nutritional insults.
- Sex-specific responses to developmental stressors are observed in various biological systems.
Purpose of the Study:
- To investigate the effects of growth restriction during early development on skull morphology in rats.
- To examine potential sex differences in the impact of undernutrition and subsequent rehabilitation on skull development.
- To compare the vulnerability of different skull regions (braincase vs. face) and the spine to early life growth restriction.
Main Methods:
- Rats were reared in large litters to induce growth restriction (undernutrition).
- Skull and spinal measurements were taken before, during, and after a rehabilitation period.
- Comparisons were made between undernourished rats, rehabilitated rats, and control groups, analyzing sex-specific differences.
Main Results:
- Skull development was less affected than spinal development by growth restriction.
- The braincase was less affected than the facial skeleton.
- No sex differences were observed during undernutrition.
- Rehabilitated females showed significant recovery in skull size and shape, matching controls.
- Undernourished males exhibited persistent deficits in skull width compared to controls.
Conclusions:
- Early life undernutrition differentially affects skeletal development, with the skull being more resilient than the spine.
- Sex plays a critical role in the long-term skeletal recovery from neonatal growth restriction.
- Females demonstrate a greater capacity for skull development recovery than males following nutritional rehabilitation.
Abstract:
In rats whose growth was restricted by rearing in large litters the skull was less affected than the spine and the brain case less than the face. No sex difference was apparent during undernutrition but on subsequent rehabilitation females had caught up to controls in four out of five skull measurements within 4 weeks and by the end of the experiment the skulls of the neonatally undernourished females were the same size and shape as the controls. In the case of males, however, the skull of the undernourished rats never attained the same width as the controls.