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Effects of perinatal diazepam exposure on the sexually dimorphic rat locus coeruleus
M Rodriguez-Zafra1, M R De Blas, C Perez-Laso
1Departamento de Psicobiología, Universidad Nacional de Educación a Distancia, Ciudad Universitaria, Madrid, Spain.
Insights
Prenatal exposure to diazepam (DZ) increased male LC size, while prenatal and postnatal exposure decreased female LC size. These findings highlight developmental neurotoxicity risks of diazepam.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- The Locus Coeruleus (LC) plays a crucial role in brain development and function.
- Prenatal and early-life exposures to substances can impact neurodevelopmental trajectories.
- Sex-specific differences in brain development are well-documented.
Purpose of the Study:
- To investigate the effects of diazepam (DZ) exposure during different developmental periods on the morphology of the Locus Coeruleus (LC).
- To determine if these effects exhibit sex-specific patterns.
Main Methods:
- Administration of diazepam (DZ) during prenatal, postnatal, and combined pre/postnatal periods in a rodent model.
- Morphometric analysis of the Locus Coeruleus (LC) to assess volume and neuron number.
Main Results:
- Prenatal diazepam (DZ) exposure significantly increased LC volume and neuron number in males.
- Both prenatal and postnatal diazepam (DZ) exposure decreased LC volume and neuron number in females.
- Combined prenatal and postnatal diazepam (DZ) exposure did not alter female LC morphology.
Conclusions:
- Developmental exposure to diazepam (DZ) differentially affects male and female Locus Coeruleus (LC) morphology.
- Prenatal exposure poses a risk for male LC development, while combined exposure periods pose risks for females.
- These findings underscore the potential for sex-specific neurodevelopmental toxicity from early-life diazepam (DZ) exposure.
Abstract:
Diazepam (DZ) administration over prenatal, postnatal, and pre plus postnatal periods altered the normal expression of the morphological sex differences of the LC. Males were affected only by the prenatal exposure and the effect of this exposure produced an increase in the volume and neuron number of male's LC. By contrast, females were affected by both pre and postnatal treatments and the effect of this exposure resulted in a decrease in the volume and neuron number of female's LC. However, pre plus postnatal treatment did not affect female's LC.