Waterborne Risperidone Decreases Stress Response in Zebrafish

Area of Science:

• Environmental toxicology
• Neuroendocrinology
• Aquatic ecotoxicology

Background:

• Pharmaceuticals, including antipsychotics, are increasingly detected in surface waters.
• The ecological impacts of these contaminants on aquatic organisms remain poorly understood.
• Risperidone is a widely prescribed antipsychotic with potential environmental release.

Purpose of the Study:

• To investigate the effects of acute risperidone exposure on zebrafish.
• To assess the impact on stress and behavioral responses.
• To understand the neuroendocrine mechanisms involved.

Main Methods:

• Zebrafish were exposed to varying concentrations of risperidone.
• Stress responses were evaluated by examining the hypothalamic-pituitary-interrenal (HPI) axis.
• Behavioral assays were conducted to assess anxiolytic-like effects.

Main Results:

• Intermediate concentrations of risperidone inhibited the HPI axis in zebrafish.
• Exposure to risperidone resulted in anxiolytic-like behavioral changes.
• These findings indicate a direct impact on the neuroendocrine system.

Conclusions:

• Aquatic environments contaminated with risperidone can alter zebrafish neuroendocrine and behavior profiles.
• The study highlights the potential risks of antipsychotic drugs to aquatic ecosystems.
• Further research is needed to assess long-term and population-level effects.