Hyperactivity induced by prenatal BrdU exposure across several experimental conditions

Area of Science:

• Neuroscience
• Toxicology
• Developmental Biology

Background:

• Reproducibility of behavioral results in developmental neurotoxicity (DNT) testing is a significant challenge.
• Positive controls are crucial for validating DNT test protocols, but their reliability can be affected by various factors.

Purpose of the Study:

• To investigate the reproducibility of BrdU-induced hyperactivity as a positive control in DNT tests.
• To assess the impact of strain, gender, and test conditions on BrdU-induced hyperactivity.

Main Methods:

• Administered BrdU (bromodeoxyuridine) to rodents.
• Assessed hyperactivity as a behavioral outcome.
• Varied rat strains (SD and F344), rodent species (rat and mouse), sex, and background sound levels during testing.

Main Results:

• BrdU-induced hyperactivity was consistently reproducible across different rat strains, between rats and mice, and in both male and female subjects.
• Increased background sound levels did not alter the persistent hyperactivity observed.
• The BrdU-animal model proved effective as a positive control.

Conclusions:

• The BrdU-animal model is a robust and reproducible positive control for DNT testing.
• Prenatal BrdU exposure can validate the entire DNT testing process, enhancing reliability.
• The model's consistency across diverse conditions supports its utility in toxicological assessments.