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Aspirin-induced psychoteratogenesis in rats as a function of embryonic age
Insights
Aspirin exposure during early gestation in rats significantly impacts offspring neurobehavior and growth. Timing of aspirin (acetylsalicylic acid) administration is critical, with Day 11 exposure causing more severe deficits than Day 12.
Area of Science:
- Developmental toxicology
- Neuroscience
- Pharmacology
Background:
- Aspirin (acetylsalicylic acid) is commonly used, but its effects on prenatal development require further investigation.
- The timing of drug exposure during critical developmental windows can influence outcomes.
- Understanding the specific neurobehavioral impacts of aspirin is crucial for assessing developmental risks.
Purpose of the Study:
- To investigate the impact of aspirin exposure on specific gestational days (Day 11 vs. Day 12) on postnatal neurobehavior and growth in Wistar rats.
- To determine if the timing of aspirin administration influences the severity of developmental effects.
- To analyze the relationship between aspirin-induced growth deficits and observed behavioral changes.
Main Methods:
- Gravid Wistar rats were administered aspirin (625 mg/kg) or vehicle on gestational Day 11 or Day 12.
- Progeny were assessed postnatally using standardized neurobehavioral tests (locomotion, geotaxis, olfactory orientation, swimming) and physical measurements.
- Statistical analyses were performed to correlate behavioral outcomes with body weight changes.
Main Results:
- Aspirin administered on Day 11 resulted in significant maternal and offspring growth deficits, unlike administration on Day 12.
- Day 11 aspirin exposure impaired progeny performance in pivoting locomotion, negative geotaxis, olfactory orientation, and swimming.
- Some behavioral deficits (e.g., negative geotaxis) correlated with reduced body weight, while others (e.g., olfactory orientation) were more pronounced after accounting for weight differences.
Conclusions:
- A 24-hour difference in embryonic exposure timing to aspirin significantly alters postnatal neurobehavioral outcomes and growth.
- The interpretation of behavioral test results must consider potential confounding effects of body weight changes.
- Neurobehavioral assessments provide valuable insights into the toxicological effects of aspirin beyond simple growth or physical development metrics.
Abstract:
Gravid Wistar rats were treated with either 625 mg/kg of aspirin (acetylsalicylic acid) or vehicle alone on either gestational Day 11 or 12, and their progeny were evaluated postnatally using a standardized series of neurobehavioral tests and physical measurements. The results showed that aspirin given on Day 11 produced maternal and offspring growth deficits not seen when given on Day 12. In addition, aspirin on Day 11 reduced behavioral performance in the progeny on tests of pivoting locomotion, negative geotaxis orientation, home scent (olfactory) orientation, and swimming performance. Further analysis revealed that some of the behavioral effects of aspirin on Day 11 significantly covaried with the body weight reductions noted in this group, such as negative geotaxis, whereas other results showed only minor associations with weight, such as pivoting and swimming. Interestingly, the olfactory orientation results were more apparent after body weight differences were factored out. These data demonstrate that (1) aspirin causes marked differences both in behavior and postnatal growth with only a 24-hr difference in embryonic age at the time of treatment; (2) behavioral tests are differentially affected by differences in body weight; and (3) behavioral tests appear to be measuring phenomena not reflected by growth, survival, or physical landmarks of development and, as such, add significant information about the toxicological effects of aspirin.