Potential effects of bexarotene on neural development and function in zebrafish embryos

Area of Science:

• Environmental Toxicology
• Developmental Neuroscience
• Pharmacology

Background:

• Bexarotene, a retinoid X receptor agonist, treats cutaneous T-cell lymphoma.
• Its effects on aquatic vertebrate neurodevelopment are largely unknown.
• Zebrafish are a key model for studying developmental toxicity.

Purpose of the Study:

• Investigate bexarotene's impact on zebrafish embryonic nervous system development.
• Determine dose-dependent effects and underlying molecular mechanisms.
• Assess potential neurodevelopmental risks of bexarotene exposure.

Main Methods:

• Exposed zebrafish embryos to bexarotene (3, 6, 9 μg/L).
• Utilized transcriptomics, qPCR, and histopathology.
• Performed pharmacological interventions (Wnt inhibitor IWR-1).

Main Results:

• Observed morphological abnormalities, head malformations, and shortened head dimensions.
• Detected cell apoptosis, shortened motor neuron axons, and impaired myelin development.
• Noted cerebellar damage, abnormal behavior, altered gene expression, and increased acetylcholinesterase activity.

Conclusions:

• Bexarotene induces significant neurodevelopmental toxicity in zebrafish embryos.
• Wnt signaling pathway activation is implicated in these effects.
• Findings underscore the importance of evaluating drug safety in aquatic models.