Gene expression responses in different regions of Eisenia fetida with antiparasitic albendazole exposure

Albendazole (ABZ) is a veterinary drug with a high efficiency against parasite. The aim of this research is to investigate and characterize the response of gene expression in different regions of earthworms Eisenia fetida in relation to ABZ exposure. In this research, the earthworms were exposed to ABZ at 0, 10, 30, 90, and 270 mg/kg concentrations for 42 days. Within the initial 14-day exposure, the expression levels of two target genes (mitochondrial large ribosomal subunit (l-rRNA) and heat shock protein (HSP90)) in different regions of earthworms were affected significantly by the different exposure concentrations of ABZ, but the growth rates were similar among the ABZ and control groups. With longer exposure time, growth rates decreased significantly after 28 days of exposure at 90 and 270 mg/kg. These results of target genes expression suggest that, at low ABZ concentrations, the middle region of earthworms is more sensitive to ABZ than the anterior and posterior regions. In the middle region, the l-rRNA expression of the ABZ-exposed groups was significantly lower than the control group, with a reduction to 23%, 25% and 31% for 10, 30 and 90 mg/kg ABZ concentrations, respectively (P<0.01). In contrast, the HSP90 expression of the ABZ groups (full range of 10 to 270 mg/kg) in the middle region increased 4.1-8.7 folds over the control group (P<0.01). In the anterior and posterior regions, the expression of the two target genes at 10mg/kg did not differ significantly among the ABZ and control groups (P>0.05), except for l-rRNA in the posterior region. The characterization and understanding of target genes expression in different regions of earthworms can provide important information on predictive early reading on the pollution of ABZ residue in soils.