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Updated: May 30, 2026
Small Molecule Screening and Toxicity Testing in Early-stage Zebrafish Larvae
Published on: March 7, 2025
Developmental anomalies induced by a non-selective COX inhibitor (ibuprofen) in zebrafish (Danio rerio)
Anuradha David1, Katti Pancharatna
1Department of Zoology, Karnatak University, Dharwad-580 003, India.
Abstract:
Effects of ibuprofen (a non-selective COX inhibitor) on the embryonic development, hatching success, larval growth, behavioral pattern and survival competence were studied in Danio rerio. Embryos at 2/4 celled stage were exposed to graded doses (0, 1, 5, 10, 50 and 100μg/L distilled water) of ibuprofen in triplicate sets (n=30). The experiment was repeated thrice. The results indicate that developing embryos tolerated lower (1 and 5μg/L) doses of the drug readily but, exposure to higher doses (>10μg/L) caused retarded development, decreased hatching rate and growth, cardiac anomalies, spinal curvature, pectoral fin malformation and behavioral alterations resulting in greater mortality of experimental embryos. This study suggests that, ibuprofen which is marketed as over-the-counter (OTC) drug is embryotoxic at least at higher (>10μg/L) dose level to zebrafish embryos.
Insights
Ibuprofen, an over-the-counter pain reliever, harms zebrafish embryo development at higher doses. This study shows ibuprofen causes developmental issues, reduced hatching, and increased mortality in zebrafish embryos above 10μg/L.
Area of Science:
- Environmental Toxicology
- Developmental Biology
- Pharmacology
Background:
- Ibuprofen is a widely used non-selective cyclooxygenase (COX) inhibitor.
- Over-the-counter (OTC) medications can enter aquatic environments, potentially impacting wildlife.
- Zebrafish (Danio rerio) are a valuable model organism for studying embryonic development and toxicity.
Purpose of the Study:
- To investigate the effects of various ibuprofen concentrations on zebrafish embryonic development.
- To assess the impact of ibuprofen on hatching success, larval growth, and survival.
- To determine the dose-dependent toxicity of ibuprofen in zebrafish embryos.
Main Methods:
- Zebrafish embryos at the 2/4-cell stage were exposed to a range of ibuprofen concentrations (0, 1, 5, 10, 50, 100 μg/L).
- Experiments were conducted in triplicate with 30 embryos per set and repeated three times.
- Evaluated endpoints included embryonic development, hatching rates, larval growth, physical malformations, behavioral patterns, and mortality.
Main Results:
- Zebrafish embryos tolerated low ibuprofen doses (1 and 5 μg/L) without significant adverse effects.
- Higher ibuprofen concentrations (>10 μg/L) led to retarded embryonic development and reduced hatching success.
- Exposure to elevated ibuprofen levels resulted in cardiac anomalies, spinal curvature, fin malformations, behavioral changes, and increased mortality.
Conclusions:
- Ibuprofen exhibits embryotoxic effects on zebrafish embryos at concentrations exceeding 10 μg/L.
- The study highlights potential risks of OTC drug pollution to aquatic vertebrate development.
- Further research is warranted to understand the long-term ecological consequences of ibuprofen exposure in aquatic ecosystems.
