Overexpression of Mn-superoxide dismutase in Oxya chinensis mediates increased malathion tolerance

Autor: Xuekai Shi, Yiwei Zhang, Jianzhen Zhang, Enbo Ma, Haihua Wu
Rok vydání: 2017
Předmět:
0301 basic medicine
Insecticides
Environmental Engineering
animal diseases
Health
Toxicology and Mutagenesis
0211 other engineering and technologies
Grasshoppers
02 engineering and technology
medicine.disease_cause
Superoxide dismutase
03 medical and health sciences
chemistry.chemical_compound
RNA interference
Escherichia coli
medicine
Animals
Environmental Chemistry
Gene silencing
Genetics
chemistry.chemical_classification
021110 strategic
defence & security studies
Reactive oxygen species
biology
Superoxide Dismutase
fungi
Organophosphate
Public Health
Environmental and Occupational Health
General Medicine
General Chemistry
Pollution
Molecular biology
Up-Regulation
Oxidative Stress
030104 developmental biology
chemistry
Malathion
biology.protein
Reactive Oxygen Species
Oxidation-Reduction
Oxidative stress
Intracellular
Zdroj: Chemosphere. 181:352-359
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2017.04.087
Popis: Superoxide dismutase (SOD) is the first line of defense against oxidative damage. Malathion is an organophosphate insecticide and can induce the production of reactive oxygen species (ROS) and cause the intracellular oxidative stress. The present study was undertaken to examine the effects of malathion on SODs activity and their transcriptional levels in Oxya chinensis (Thunberg) (Orthoptera: Acrididae). The results showed that total SOD and MnSOD activities increased as a dose-dependent manner while CuZnSOD activity has no significant changes after malathion treatments. Total SOD and MnSOD activities were the highest at the concentration of 0.8 μg μL −1 malathion treatment and increased significantly about 1.81- and 2.48-fold compared with the control, respectively. Increased mRNA expression of MnSOD , ecCuZnSOD1 , and ecCuZnSOD2 were observed after malathion treatments. Moreover, the alteration of MnSOD transcript was similar to the profiles of MnSOD activity. These results suggested that the up-regulation expression of MnSOD transcript led to the increase of MnSOD activity in order to eliminate the excessive ROS caused by malathion. In addition, we evaluated the role of individual SOD gene in malathion stress by using RNAi and recombinant SOD proteins. The results showed that ROS contents increased significantly after the silencing of MnSOD and ecCuZnSOD1 genes. The OD values of the E. coli cells transformed with pET-28a-OcMnSOD plasmid were 1.13–1.31-fold and 1.08–1.33-fold higher than those of cells with pET-28a plasmids under 0.4 and 0.8 μg μL −1 malathion treatments, respectively. These findings indicated that MnSOD exerted an important role in defense oxidative stress caused by malathion.
Databáze: OpenAIRE
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