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Pharmaceuticals like diazepam and fluoxetine disrupt the stress axis in zebrafish. Environmental drug concentrations can impair fish neuroendocrine function, highlighting risks to aquatic ecosystems.

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Area of Science:

  • Environmental toxicology
  • Aquatic pharmacology
  • Fish neuroendocrinology

Background:

  • Pharmaceuticals are detected in aquatic environments globally.
  • The ecological impact of these contaminants on aquatic organisms remains largely unknown.
  • Psychoactive drugs, including anxiolytics and antidepressants, are among the frequently detected pharmaceuticals.

Purpose of the Study:

  • To investigate the effects of acute exposure to diazepam and fluoxetine on the stress response in zebrafish (Danio rerio).
  • To characterize the neuroendocrine disruption potential of common psychoactive pharmaceuticals in fish.

Main Methods:

  • Zebrafish were exposed to varying concentrations of diazepam or fluoxetine.
  • The stress response was evaluated by measuring cortisol levels, a key biomarker of the hypothalamic-pituitary-adrenal axis.
  • Acute toxicity and neuroendocrine effects were assessed.

Main Results:

  • Both diazepam and fluoxetine were found to inhibit the zebrafish stress axis.
  • Diazepam suppressed cortisol levels at intermediate concentrations.
  • Fluoxetine inhibited cortisol increase at environmentally relevant concentrations, indicating significant ecological risk.

Conclusions:

  • Psychoactive pharmaceuticals in aquatic ecosystems can lead to significant neuroendocrine dysfunction in fish.
  • The findings underscore the potential for widespread ecological harm from pharmaceutical pollution.
  • Further research is needed to understand the long-term consequences for aquatic life.