Gestational Paracetamol (Acetaminophen) Toxicity Induces Behavioral and Structural Brain Defects in Rats

Area of Science:

• Neuroscience
• Developmental Biology
• Pharmacology

Background:

• Paracetamol (acetaminophen) is a widely used analgesic.
• Gestational paracetamol use has been tentatively linked to neurodevelopmental disorders in offspring.
• The precise impact of prenatal paracetamol exposure on offspring neurodevelopment requires further investigation.

Purpose of the Study:

• To investigate the effects of prenatal paracetamol exposure on neurobehavioral and neuropathological outcomes in 1-month-old rat offspring.
• To assess the role of brain-derived neurotrophic factor (BDNF) in paracetamol-induced neurodevelopmental changes.

Main Methods:

• Pregnant rats were administered saline, sodium valproate (positive control), or varying doses of paracetamol during critical developmental periods.
• Offspring were evaluated using neurobehavioral tests.
• Histopathological and immunohistochemical analyses were performed on offspring brains, focusing on the cerebellum and hippocampus, and assessing BDNF expression.

Main Results:

• Offspring exposed prenatally to a single high dose of paracetamol (group IV) and valproic acid (group II) exhibited significant alterations in neurobehavioral parameters.
• These behavioral changes were correlated with observed cerebellar and hippocampal pathology.
• Immunohistochemical analysis revealed altered BDNF staining patterns in the cerebellum and hippocampus of exposed offspring.

Conclusions:

• High-dose prenatal paracetamol exposure can induce neurodevelopmental pathology in rat offspring.
• The findings suggest that the safety of paracetamol use during pregnancy warrants continued scrutiny and further research.
• Altered BDNF expression may play a role in the observed neurodevelopmental effects.