Abstract
To study the responses of digestive system of the freshwater crab Sinopotamon henanense to the exposure with cadmium (Cd), crabs were acutely exposed to 7.25, 14.50, and 29.00 mg/l Cd for 96 h and subchronically exposed to 0.725, 1.450, and 2.900 mg/l for 21 days. Cd bioaccumulation in the hepatopancreas and digestive tract (esophagus and intestine) was examined. Furthermore, histopathological alterations of the esophagus, midgut, hindgut, and hepatopancreas were assessed in animals from the 29.0 and 2.90 mg/l Cd treatment groups, and expression of metallothionein messenger RNA (MT mRNA) in the hepatopancreas and intestine was measured in all treatment groups. The results showed difference in the middle and high concentrations between acute and subchronic treatment groups. Cd content in digestive tract after acute 14.5 and 29.0 mg/l Cd exposure was significantly higher than that at subchronic 1.45 and 2.90 mg/l exposure, but Cd levels in hepatopancreas were not significantly different under the same condition. Acute exposure to Cd induced greater morphological damage than subchronic exposure: large areas of epithelial cells were necrotic in hepatopancreas and midgut, which detached from the basal lamina. Vacuolated muscle cells were observed in the hindgut of animals from the acute exposure group, but the changes of esophageal morphology were not obvious after acute or subchronic treatments. The expression of MT mRNA increased with increasing Cd concentration, and MT mRNA level in acute exposure groups was significantly lower when compared to the subchronic exposure groups. Higher Cd content and lower MT mRNA expression in the acutely exposed groups may be responsible for more severe damage of digestive system in these exposure groups.
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Acknowledgments
This work was supported by the National Nature Science Foundation (No. 31272319) and the Overseas Returnee Research Fund in Shanxi Province (No. 201015). The authors are thankful to Prof. Hans-Uwe Dahms and Shaoqin Li for critical amendments to the manuscript.
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Wu, H., Li, Y., Lang, X. et al. Bioaccumulation, morphological changes, and induction of metallothionein gene expression in the digestive system of the freshwater crab Sinopotamon henanense after exposure to cadmium. Environ Sci Pollut Res 22, 11585–11594 (2015). https://doi.org/10.1007/s11356-015-4419-5
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DOI: https://doi.org/10.1007/s11356-015-4419-5