PUBLICATION
Preheating mitigates cadmium toxicity in zebrafish livers: Evidence from promoter demethylation, gene transcription to biochemical levels
- Authors
- Zheng, J.L., Guo, S.N., Yuan, S.S., Xia, H., Zhu, Q.L., Lv, Z.M.
- ID
- ZDB-PUB-170714-3
- Date
- 2017
- Source
- Aquatic toxicology (Amsterdam, Netherlands) 190: 104-111 (Journal)
- Registered Authors
- Keywords
- Cadmium exposure, Fish, Gene regulation, Heat treatment
- MeSH Terms
-
- Animals
- Cadmium/toxicity*
- DNA Methylation/drug effects*
- HSP70 Heat-Shock Proteins/metabolism
- Lipid Peroxidation/drug effects
- Lipid Peroxidation/genetics
- Liver/drug effects*
- Liver/metabolism
- Promoter Regions, Genetic
- Thermotolerance/physiology*
- Transcription, Genetic/drug effects*
- Up-Regulation
- Water Pollutants, Chemical/toxicity*
- Zebrafish/genetics
- Zebrafish/metabolism*
- PubMed
- 28704659 Full text @ Aquat. Toxicol.
Citation
Zheng, J.L., Guo, S.N., Yuan, S.S., Xia, H., Zhu, Q.L., Lv, Z.M. (2017) Preheating mitigates cadmium toxicity in zebrafish livers: Evidence from promoter demethylation, gene transcription to biochemical levels. Aquatic toxicology (Amsterdam, Netherlands). 190:104-111.
Abstract
The working hypothesis for this study was that moderate heat stress would alleviate the deleterious effects of subsequent cadmium (Cd) exposure on fish. Thus, zebrafish (Danio rerio) were subjected to water maintained at 26°C and 34°C for 4days, and then exposed to 0 or 200μg/L Cd for 1 week at 26°C. Multiple indicators were measured from livers of zebrafish at different levels, including DNA, RNA, protein and enzymatic activity associated with oxidative stress, inflammation and metal transport. The ameliorative effect of preheatinging on Cd toxicity was demonstrated. In the Cd-exposed groups, preheating decreased mortality and lipid peroxidation, increased activity levels of catalase (CAT) and copper/zinc-superoxide dismutase (Cu/Zn-SOD), and up-regulated mRNA levels of heat shock protein 70 (HSP70) and heat shock factor 2 (HSF2). Preheating also mitigated Cd-induced increases in protein and mRNA levels of metallothioneins (MTs), and mRNA levels of several inflammation-related genes. Furthermore, preheating alone dramatically up-regulated mRNA levels of genes related to antioxidant and immune defenses, zinc and copper transporters, protein folding, and reduced methylation levels in the HSF binding motif of the HSP70 promoter. Overall, preheating-induced accumulation of transcripts via demethylation might support the rapid defense responses at post-transcriptional levels caused by subsequent Cd exposure, indicating an adaptive mechanism for organisms exposed to one mild stressor followed by another.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping