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Cyclooxygenase inhibitors affect bone mineralization in rat fetuses
Franciszek Burdan1, Ingrid Rozylo-Kalinowska, Justyna Szumilo
1Experimental Teratology Unit, Human Anatomy Department, Medical University of Lublin, Lublin, Poland. fb3@wp.pl
Cells, Tissues, Organs
|November 10, 2007
Summary
Nonselective COX inhibitors, like tolmetin, can decrease fetal bone mineralization in rats at high doses. Maternal health and protein levels significantly impact fetal bone development during prenatal drug exposure.
Area of Science:
- Pharmacology
- Developmental Biology
- Toxicology
Background:
- Nonselective (e.g., ibuprofen, piroxicam, tolmetin) and selective (DFU) cyclooxygenase (COX)-2 inhibitors, or nonsteroidal anti-inflammatory drugs (NSAIDs), have been linked to developmental issues.
- Previous reports noted intrauterine growth retardation and cartilage/joint abnormalities with NSAID use.
Purpose of the Study:
- To investigate the impact of prenatal exposure to COX inhibitors on lumbar vertebra mineralization in fetal rats.
- To assess dose-dependent effects and compare nonselective vs. selective COX-2 inhibitors on fetal bone development.
Main Methods:
- Pregnant rats received intragastric administration of COX inhibitors from gestational days 8 to 21.
- Fetuses were delivered on day 21 for digital radiological examination and alizarin/alcian blue staining.
- Qualitative (staining intensity) and quantitative (radiological analysis) assessments of vertebra mineralization were performed.
Main Results:
- Highest doses of nonselective COX inhibitors led to a significant decrease in alizarin staining, indicating reduced mineralization.
- Quantitative analysis confirmed decreased vertebra mineralization, with significant effects on lumbar vertebrae 5 and 6 at the highest tolmetin dose.
- Maternal serum total protein levels strongly correlated with fetal bone optical density.
Conclusions:
- High-dose nonselective COX inhibitors, unlike DFU, reduced fetal bone mineralization in rats.
- Maternal health status and nutritional factors (e.g., protein levels) play a crucial role in mediating the effects of prenatal drug exposure on fetal bone development.
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