Biochemical biomarkers of Glyphodes pyloalis Walker (Lepidoptera: Pyralidae) in exposure to TiO2 nanoparticles

Authors

  • N Memarizadeh Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
  • M Ghadamyari Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
  • M Adeli Department of Chemistry, Faculty of Science, University of Lorestan, Khoramabad, Iran ; Department of Chemistry, Sharif University of Technology, Tehran, Iran
  • K Talebi Department of Plant Protection, Faculty of Agriculture, University of Tehran, Karaj, Iran

Keywords:

TiO2-NPs, biomarker, Glyphodes pyloalis, esterases, glutathione S-transferase, peroxidase

Abstract

Biochemical biomarkers and bioassays, due to their assumed immediate response after acute
exposure of the organism to the stressor, are useful tools to gauging anthropogenic impacts. The toxicity of TiO2-nanoparticles (TiO2-NPs) on the Glyphodes pyloalis Walker was assessed and the LC50 value obtained as 660.85 mg/L. The in vivo responses of G. pyloalis to sub-lethal concentrations of TiO2-NPs were surveyed by monitoring the activity of general esterases (EST), peroxidase (POD) and glutathione S-transferase (GST), as biochemical biomarkers. Activity of these biomarkers affected by exposure to TiO2-NPs and this could lead to the mortality or sub-lethal impacts. The effect of TiO2-NPs concentrations on the activity of these enzymes was correlated to the exposure time. The activity of EST and GST was significantly decreased compared to the control, after 24 h of treatments. By increasing exposure time, the expression of EST and GST was significantly increased. More POD expression was occurred at low concentrations (i.e. LC20 and LC30); however, at high concentrations, less POD activity obtained. It can be concluded that these enzymes are good early indicator of toxicity and in conjunction with acute toxicity studies allow adverse effects of TiO2-NPs to be predicted and managed.

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Published

2014-01-28

Issue

Section

Research Reports