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Updated: Oct 23, 2025
Small Molecule Screening and Toxicity Testing in Early-stage Zebrafish Larvae
Published on: March 7, 2025
Developmental toxicity of cryptotanshinone on the early-life stage of zebrafish development
1Department of Pharmacology, School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People's Republic of China.
Abstract:
Cryptotanshinone (Cry) has multiple potential functions in treating different diseases. Most studies on Cry focus on its pharmacological effects and mechanisms, but toxicological reports on Cry are rare. Zebrafish is used as a model organism in drug development as it saves costs and time. This work aimed to investigate the toxicity of Cry on zebrafish. Results showed that growth retardation, pericardial edema, and scoliosis occurred when zebrafish embryos were exposed to Cry, indicating its teratogenic effects. Cell apoptosis was observed in the brainstem area of embryos using acridine orange staining, and qPCR showed that caspase-3 was increased in Cry-exposed embryos. The results of locomotor activity and touched-evoke escape reaction experiments showed that Cry significantly reduced the swimming speed and escape reaction time of larvae.
Insights
Cryptotanshinone (Cry) exhibits teratogenic effects in zebrafish, causing developmental abnormalities and impacting larval behavior. Further research is needed to understand its toxicity profile.
Area of Science:
- Toxicology
- Developmental Biology
- Pharmacology
Background:
- Cryptotanshinone (Cry) shows therapeutic potential, but its toxicological profile is largely unexplored.
- Zebrafish serve as a valuable model organism for cost-effective drug development and toxicity screening.
Purpose of the Study:
- To investigate the potential toxicity of Cryptotanshinone (Cry) in zebrafish embryos and larvae.
- To assess the developmental and behavioral effects of Cry exposure.
Main Methods:
- Zebrafish embryos were exposed to varying concentrations of Cry.
- Teratogenic effects were assessed, and cell apoptosis in the brainstem was analyzed using acridine orange staining.
- Quantitative PCR (qPCR) was used to measure caspase-3 expression.
- Locomotor activity and escape responses in larvae were evaluated.
Main Results:
- Cry exposure led to significant growth retardation, pericardial edema, and scoliosis in zebrafish embryos, indicating teratogenicity.
- Increased cell apoptosis was observed in the brainstem of Cry-exposed embryos, with elevated caspase-3 levels.
- Larval locomotor activity was reduced, and their escape response to touch stimuli was impaired.
Conclusions:
- Cryptotanshinone (Cry) exhibits significant teratogenic effects in zebrafish, impacting embryonic development and larval neurobehavior.
- Cry-induced toxicity may involve apoptosis in the brainstem and impaired motor function.
- These findings highlight the need for careful toxicological evaluation of Cry in drug development.
