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Prenatal Exposure to Continuous Constant Light Alters Endochondral Ossification of the Tibiae of Rat Pups
Insights
Prenatal exposure to constant light, a chronic stressor, impaired offspring tibia development. This stress reduced hypertrophic cartilage and subchondral bone volume in pups, indicating developmental deficits.
Area of Science:
- Developmental biology
- Endocrinology
- Histology
Background:
- Prenatal stress is known to affect offspring growth and development.
- Constant light exposure during pregnancy can serve as a chronic stressor.
- Endochondral ossification is a critical process for long bone development.
Purpose of the Study:
- To investigate the impact of prenatal constant light exposure on endochondral ossification in rat tibiae.
- To histomorphometrically evaluate bone development in offspring exposed to a light/light cycle during gestation.
Main Methods:
- Pregnant rats were divided into light/light (LL) and light/dark (control) cycle groups during days 10-20 of gestation.
- Offspring tibiae were collected on postnatal days 3 and 15 for histological analysis.
- Histomorphometric analysis included hematoxylin and eosin staining and TRAP histochemistry to assess bone and cartilage parameters.
Main Results:
- Prenatal stress (LL) significantly decreased hypertrophic cartilage thickness in 3-day-old and 15-day-old pups.
- Subchondral bone volume was significantly reduced in 3-day-old LL pups compared to controls.
- These findings indicate impaired tibial growth due to prenatal stress.
Conclusions:
- Prenatal exposure to constant light as a chronic stressor negatively impacts offspring skeletal development.
- The observed reductions in hypertrophic cartilage and subchondral bone suggest developmental delays in endochondral ossification.
- This study highlights the vulnerability of fetal bone development to maternal stress during critical gestational periods.
Unlabelled:
Clinical and experimental studies suggest that prenatal exposure to stress can impact the growth and development of offspring. The effect of prenatal exposure to constant light, applied as a chronic stressor, on endochondral ossification of the tibiae of 3-day-old and 15-day-old pups was histomorphometrically evaluated. Pregnant rats were divided into 2 groups: mothers chronically exposed to a 12:12-hour light/light cycle (LL) and control mothers maintained on a 12:12-hour light/dark cycle on days 10-20 of pregnancy. On postnatal days 3 and 15, the pups were weighed and euthanized. The tibiae were resected and histologically processed to obtain sections for hematoxylin and eosin staining (HE) and tartrate-resistant acid phosphatase (TRAP) histochemistry, in order to perform histomorphometric determinations. The data were statistically analyzed. A significant decrease in hypertrophic cartilage thickness was observed in the tibiae of the 3-day-old (LL: 0.134 ± 0.02 vs.
Controls:
0.209 ± 0.023 mm; p < 0.01) and 15-day-old (LL: 23.32 ± 3.98 vs.
Controls:
22.96 ± 1.93 mm; p < 0.05) prenatally stressed pups. The subchondral bone volume was significantly lower in the tibiae of the 3-day-old LL pups (38.83 ± 6.14%) than in the controls (62.83 ± 10.67%; p < 0.01). The decrease in subchondral bone volume and hypertrophic cartilage thickness shows that the normal growth process of the tibia is impaired in prenatally stressed pups.
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