PUBLICATION
Exposure to Boscalid Induces Reproductive Toxicity of Zebrafish by Gender-Specific Alterations in Steroidogenesis
- Authors
- Qian, L., Qi, S., Zhang, J., Duan, M., Schlenk, D., Jiang, J., Wang, C.
- ID
- ZDB-PUB-201120-7
- Date
- 2020
- Source
- Environmental science & technology 54: 14275-14287 (Journal)
- Registered Authors
- Keywords
- none
- MeSH Terms
-
- Animals
- Biphenyl Compounds
- Female
- Gonads
- Male
- Molecular Docking Simulation
- Niacinamide/analogs & derivatives
- Reproduction
- Vitellogenins
- Water Pollutants, Chemical*/toxicity
- Zebrafish*
- PubMed
- 33138376 Full text @ Env. Sci. Tech.
Citation
Qian, L., Qi, S., Zhang, J., Duan, M., Schlenk, D., Jiang, J., Wang, C. (2020) Exposure to Boscalid Induces Reproductive Toxicity of Zebrafish by Gender-Specific Alterations in Steroidogenesis. Environmental science & technology. 54:14275-14287.
Abstract
Boscalid is a succinate dehydrogenase inhibitor fungicide and is frequently detected in surface water. Due to the frequent detection of boscalid, we evaluated its impact on the reproduction of adult zebrafish following a 21 d exposure to 0, 0.01, 0.1, and 1.0 mg/L. Following exposure to boscalid, the fertility of female zebrafish and fertilization rate of spawning eggs were reduced in a concentration-dependent manner up to a respective 87% and 20% in the highest concentration. A significant 16% reduction in the percentage of late vitellogenic oocytes was noted in ovaries, and a significant 74% reduction in the percentage of spermatids in testis was also observed after treatment with 1.0 mg/L. 17β-Estradiol (E2) concentrations decreased significantly in females (34% decrease) but significantly increased in males (15% increase) following 1.0 mg/L boscalid treatment. The expression of genes (such as era, er2b, cyp19a, and cyp19b) related to the hypothalamus-pituitary-gonad-liver (HPGL) axis was significantly altered and positively correlated with E2 concentrations in female and male zebrafish (p < 0.05). Molecular docking results revealed that the binding modes between boscalid and target proteins (ER and CYP19) of zebrafish were similar to that of the reference compounds and the target proteins. The binding energies indicate that boscalid may have a weak estrogen-like binding effect or CYP19 inhibition, potentially altering the HPGL axis, thereby reducing E2 concentrations and fecundity in females. In contrast, boscalid caused significant induction of E2 steroidogenesis and subsequent feminization of gonads in males, indicating gender-specific adverse outcome pathways.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping