Moderate temperature elevation increase susceptibility of early-life stage of the Mediterranean mussel, Mytilus galloprovincialis to metal-induced genotoxicity
OYSTER CRASSOSTREA-GIGAS
; DNA STRAND BREAKS
; OXIDATIVE STRESS
; PACIFIC OYSTER
; SILVER NANOPARTICLES
; LARVAL DEVELOPMENT
; CHEMICAL TOXICITY
; THERMAL-STRESS
; CLIMATE-CHANGE
; HEAVY-METALS
WOS学科分类:
Environmental Sciences
WOS研究方向:
Environmental Sciences & Ecology
英文摘要:
The present study aims to evaluate the effects of copper and silver alone or along with a moderate temperature increase on embryonic development, DNA integrity and target gene expression levels in early life stages of Mytilus galloprovincialis. For this purpose, upon fertilized embryos were exposed to a sub-lethal concentration of Cu (9.54 mu g/L), Ag (2.55 mu g/L) and to the mixture of the two metals (Cu (6.67 mu g/L) + Ag (1.47 mu g/L)) along with a temperature gradient (18, 20 and 22 degrees C). In all experiments, larvae were exposed to stressors for 48 h except for those designed to DNA damage analysis exposed only for 24 h (before shell formation). Our results showed a significant increase in the percentage of malformed D-larvae (p < 0.05) with increasing temperature and exposure to silver and copper alone or in a mixture. Moreover, metal toxicity increased significantly (p < 0.05) with the temperature rise. Genotoxicity was evaluated using classic and modified with Formamidopyrimidine DNA glycosylase (Fpg) Comet assay. Results suggest that co-exposure to metals and temperature significantly increased DNA damage on mussel larvae with a more accentuated oxidative damage. A significant transcription modulation was observed for genes involved in DNA repair and DNA replication (p53, DNA ligase II and topoisomerase II) when larvae are exposed to a single stressor. However, in the case of multiple stresses, caspase involved in the cell apoptosis pathway was overexpressed. Our study suggests that mussel larvae exposed to a moderate increase in temperature may have a compromised ability to defend against genotoxicity. This is particularly relevant in the context of global warming and thermal pollution. (C) 2019 Elsevier B.V. All rights reserved.
Boukadida, Khouloud,Cachot, Jerome,Morin, Benedicte,et al. Moderate temperature elevation increase susceptibility of early-life stage of the Mediterranean mussel, Mytilus galloprovincialis to metal-induced genotoxicity[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019-01-01,663:351-360