Abstract
Studies on the freshwater crab Sinopotamon henanense have shown that acute and sub-chronic Cd2+ exposure induced differential alterations in the respiratory physiology and gill morphology. To elucidate Cd2+ toxicity under these two exposure conditions, crabs were acutely exposed to 7.14, 14.28, and 28.55 mg/L Cd2+ for 96 h and sub-chronically exposed to 0.71, 1.43, and 2.86 mg/L Cd2+ for 3 weeks. The Cd2+ accumulation, total metallothionein (MT), superoxide dismutase, and malondialdehyde (MDA) contents in the gill tissues were detected. Moreover, the glucose-6-phosphate dehydrogenase (G6PDH) activity, NADPH content, reduced glutathione (GSH), oxidized glutathione (GSSG), and GSH/GSSG ratio in the hepatopancreas were determined. The morphology of the X-organ–sinus gland complex was also observed. The results showed that sub-chronical Cd2+ exposure induced lower MT content and higher MDA level in the gills than in the acute exposure. In the hepatopancreas, acute Cd2+ exposure decreased the pentose phosphate pathway activity and NADPH content; however, an increased G6PDH activity and NADPH content were detected in sub-chronic Cd2+ exposure (2.86 mg/L). Morphological changes occurred in the sinus gland in crabs exposed to 2.86 mg/L Cd2+ for 3 weeks. The tightly packed structure composed by the axons, enlarged terminals, and glial cells, became loose and porous. Ultra-structurally, a large number of vacuoles and few neurosecretory granules were observed in the axon terminal. These effects added to our understanding of the toxic effects of Cd2+ and provide biochemical and histopathological evidence for S. henanense as a biomarker of acute or long-term waterborne Cd2+ pollution.
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The data sets used and analyzed during the current study are available from the corresponding author on reasonable request.
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We would like to thank Editage (www.editage.cn) for English language editing.
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The work was supported by the Natural Science Foundation of China (NO. 31272319), PhD Start-up Fund of Shanxi Medical University (NO. 03201552), and Youth Fund of Shanxi Medical University (NO.02201626).
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R.X participated in each experiment in the present study and completed the writing of the manuscript; H.W participated in the histological and ultra-structural examination of the X organ-sinus gland complex; Y. L participated in the determination of cadmium accumulation and MT content in the gill; B.W participated in the analysis of the data. The design, execution, data analysis of all experiments in this study, and manuscript writing and revision were completed under the guidance of L.W. All authors read and approved the final manuscript.
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Xuan, R., Wu, H., Li, Y. et al. Comparative responses of Sinopotamon henanense to acute and sub-chronic Cd exposure. Environ Sci Pollut Res 28, 35038–35050 (2021). https://doi.org/10.1007/s11356-021-13230-z
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DOI: https://doi.org/10.1007/s11356-021-13230-z