Paroxetine Triggers Inflammatory State on Zebrafish Early Embryonic Development.

Area of Science:

• Environmental toxicology
• Developmental biology
• Neuroscience

Background:

• Paroxetine (PRX) is a widely used antidepressant, often prescribed during pregnancy.
• Increased environmental paroxetine levels raise concerns about unintended embryonic exposure.
• The impact of PRX on early embryonic neurodevelopment remains understudied.

Purpose of the Study:

• To investigate the toxicological effects of paroxetine on early embryonic development.
• To assess the impact of PRX on the embryonic brain and associated biomarkers.

Main Methods:

• Utilized the Zebrafish Embryo Toxicity Test (ZFET) to expose Danio rerio embryos to varying concentrations of PRX (1, 10, 100 μg/L).
• Assessed embryonic development, larval heart rate, inflammatory markers (ROS, apoptotic cells), and acetylcholinesterase activity via immunofluorescence.

Main Results:

• Paroxetine exposure did not impede overall embryonic development.
• Larvae exposed to PRX exhibited adverse effects, including cardiac irregularities and inflammation.
• Significant reduction in acetylcholinesterase activity was observed in paroxetine-exposed larvae, particularly in the head region.

Conclusions:

• Paroxetine can penetrate the developing nervous system during embryogenesis.
• Observed neurotoxic effects, including reduced acetylcholinesterase activity, suggest potential risks to embryonic neurodevelopment.
• The findings support the need for increased caution regarding paroxetine use during pregnancy.