PUBLICATION
Single and combined exposure of microcystin-LR and nitrite results in reproductive endocrine disruption via hypothalamic-pituitary-gonadal-liver axis
- Authors
- Lin, W., Guo, H., Li, Y., Wang, L., Zhang, D., Hou, J., Wu, X., Li, L., Li, D., Zhang, X.
- ID
- ZDB-PUB-180919-1
- Date
- 2018
- Source
- Chemosphere 211: 1137-1146 (Journal)
- Registered Authors
- Keywords
- Endocrine disruption, Hypothalamic-pituitary-gonadal axis, Microcystin-LR, Nitrite, Reproductive toxicity
- MeSH Terms
-
- Animals
- Drug Synergism
- Endocrine Disruptors/toxicity*
- Endocrine System/drug effects
- Enzyme Inhibitors/pharmacology
- Gene Expression Regulation/drug effects
- Gonads/drug effects
- Male
- Microcystins/toxicity*
- Microcystis/metabolism
- Nitrites/metabolism
- Nitrites/pharmacology*
- Reproduction/drug effects
- Testis/drug effects
- Water Pollutants, Chemical/toxicity
- Zebrafish/growth & development
- Zebrafish/metabolism
- PubMed
- 30223329 Full text @ Chemosphere
Citation
Lin, W., Guo, H., Li, Y., Wang, L., Zhang, D., Hou, J., Wu, X., Li, L., Li, D., Zhang, X. (2018) Single and combined exposure of microcystin-LR and nitrite results in reproductive endocrine disruption via hypothalamic-pituitary-gonadal-liver axis. Chemosphere. 211:1137-1146.
Abstract
Microcystin-LR (MC-LR) released by Microcystis blooms degradation usually co-exists with a chemical called nitrite, posing a serious harm to aquatic organisms. To assess the single and combined effects of MC-LR and nitrite on the reproductive endocrine system, a fully factorial experiment was designed and adult male zebrafish (Danio rerio) were exposed to 9 treatment combinations of MC-LR (0, 3, 30 μg/L) and nitrite (0, 2, 20 mg/L) for 30 d. The results showed that both MC-LR and nitrite caused concentration-dependent effects including the growth inhibition, decreased gonad index as well as testicular injuries with widen intercellular spaces and seminiferous epithelium deteriorations. And testicular pathological changes in the co-exposure groups of MC-LR and nitrite were similar but more serious than those in single-factor exposure groups. Concurrently, exposure to MC-LR or nitrite alone could significantly decrease T levels by downregulating gene expressions (gnrh2, lhβ, ar, lhr) in the hypothalamic-pituitary-gonadal-liver-axis (HPGL-axis), and there were significant interactions between MC-LR and nitrite on them. In contrast, E2 levels as well as transcriptional levels of cyp19a1b, cyp19a1a and vtg1 showed significant inductions with increasing MC-LR concentrations, indicating an estrogen-like effect of MC-LR. Our findings illustrated that co-exposure of MC-LR and nitrite synergistically cause reproductive dysfunction by interfering with the HPGL axis in male fish, which prompt us to focus more on the potential risks in fish reproduction and even population dynamics due to the wide occurrence of toxic cyanobacterial blooms.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping