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Bone growth and sexual dimorphism at birth in intrauterine-growth-retarded rats
Evelia Edith Oyhenart1, María Florencia Cesani, Luis Eduardo Castro
1Instituto de Genética Veterinaria ¨Ing. Fernando Noel Dulout¨ (IGEVET), Universidad Nacional de La Plata (UNLP)-CCT La Plata-CONICET, Buenos Aires, Argentina. eoyenart@fcv.unlp.edu.ar
Insights
Reduced uterine blood flow (RUB) in pregnant rats significantly impacts fetal bone development, causing growth retardation in limb and pelvic bones. Males showed more pronounced effects than females, indicating sex-specific resilience.
Area of Science:
- Developmental Biology
- Orthopedic Research
- Reproductive Physiology
Background:
- Reduced uterine blood flow (RUB) can impair fetal development.
- Understanding its impact on skeletal growth is crucial for prenatal health.
- Sex-specific differences in growth responses are not fully characterized.
Purpose of the Study:
- To characterize skeletal changes in offspring due to reduced placental blood flow.
- To determine if bone growth retardation varies by skeletal element.
- To investigate sex-specific effects of reduced uterine blood flow on bone development.
Main Methods:
- Induced RUB by partially bending uterine vessels in pregnant rats.
- Measured lengths and widths of limb (humerus, radius, femur, tibia) and pelvic bones at birth.
- Utilized X-ray imaging and statistical analysis (ANOVA, LSD post hoc tests).
Main Results:
- RUB significantly impacted postcranial bone growth at birth.
- Pelvic length and bone widths (pelvic and limb) were more affected than bone lengths.
- Males exhibited more significant growth alterations than females.
Conclusions:
- Reduced uterine blood flow leads to observable appendicular bone growth delays at birth.
- Bone width is more sensitive to reduced blood flow than bone length.
- Females demonstrated greater resilience to growth compromise compared to males.
Abstract:
This paper addresses the effect of a reduction of uterine blood flow (RUB) on postcranial bone growth in rats. The objectives were: (1) to discover and characterize the changes evoked by growth retardation through a reduction in placental blood flow, (2) to see if the resulting growth retardation is different in each bone, and (3) to analyze any sex-specific features. RUB was induced by the partial bending of uterine vessels at day 1 of pregnancy. Control and sham-operated animals were also included. The animals were X-rayed at birth. The lengths and widths of the humerus, radius, and femur and pelvic length, interischial, interpubic, and pubic widths were measured. Data were analyzed by ANOVA and LSD post hoc tests. The intersubject analysis showed significant differences between groups and non-significant differences between sexes. In males, sham-operated and RUB showed significant differences in pelvic lengths and widths, and humeral, radial, femoral, and tibial widths. In females, there were significant differences only for humeral widths, radial lengths and widths, and femoral and tibial widths. We conclude that reduced blood flow delays appendicular bone growth as observed at birth. Pelvic length was more affected than that of the limbs. The widths of the pelvic and limbs bones, in turn, were more altered than the lengths, and the growth of the males more than that of the females. Partial bending of uterine vessels compromised postcranial growth, though under such disadvantageous circumstances the females proved to be more capable of growing and thus more resilient than the males.
