Objective:

To examine how atrazine (ATZ) modulates spine development, glutamatergic receptor expression, and microRNA-mediated regulatory pathways in primary hippocampal neurons.

Approach:

• Primary Cultures of Rat Hippocampal Neurons: Primary cultures were prepared from rat hippocampi at embryonic day 18-19, followed by enzymatic digestion and maintenance in Neurobasal medium.
• Atrazine Treatments: ATZ was dissolved in DMSO and administered to neurons from DIV 1 to 14, 16, or 18, with weekly medium replacement to mimic exposure throughout maturation.
• Cell Viability Assessment: Cell viability was measured using an MTT colorimetric assay to quantify mitochondrial dehydrogenase activity.

Key Findings:

• ATZ exposure during gestation and lactation alters spatial learning and memory in offspring.
• Chronic ATZ exposure is associated with changes in NMDA glutamatergic gene expression in the hippocampus.
• ATZ may interfere with dendritic spine formation and maturation in developing hippocampal neurons.

Interpretation:

The study indicates that ATZ exposure can negatively impact the development of the hippocampus, particularly affecting synaptic structures and glutamatergic signaling pathways.

Limitations:

• The study primarily focuses on in vitro models, which may not fully replicate in vivo conditions.
• Long-term effects of ATZ exposure beyond the studied time frames remain unclear.

Conclusion:

ATZ has the potential to disrupt critical developmental processes in hippocampal neurons, warranting further investigation into its neurotoxic effects.