Abstract
Soil cadmium (Cd) pollution is global environmental pollution and adversely affects paddy field organisms. Wolf spider grants a new insight to evaluate the toxicity triggered by Cd, yet the impact of chronic Cd exposure on the spider and its molecular mechanism remains unclear. The present study found that the wolf spider Pirata subpiraticus fed with Cd-accumulated flies for 5 weeks presented lower catalase, peroxidase, and acetylcholinesterase activities and higher malonaldehyde content than the control spiders (p < 0.05). An in-depth transcriptomic analysis yielded a total of 5995 differentially expressed genes (DEGs, with 3857 up-regulated and 2138 down-regulated genes) from the comparison, and 19 DEGs encoding three enzymatic indicators were down-regulated. Further enrichment analysis indicated that Cd stress could inhibit the expression of cuticle and chitin-encoding genes via the down-regulation of several key enzymes, such as chitin synthase, glutamine-fructose-6-phosphate transaminase, and chitinase. In addition, our findings suggested that hedgehog and FoxO signaling pathways might play an essential role in regulating survival, cell cycle, and autophagy process in spiders, which were primarily down-regulated under Cd stress. An intensely interactive network displayed that Cd exposure could repress key biological processes in P. subpiraticus, particularly peptide metabolic process and peptide biosynthetic process. To sum up, this integrative investigation confirmed an effective bioindicator for assessing Cd-induced toxicity; provided a mass of genes, proteins, and enzymes for further validation; and granted novel perspectives to uncover the molecular responses of spiders to Cd pollution.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Funding
This work was supported by the Natural Science Foundation of Hunan Province (2020JJ4427) and Key Project of Education Department of Hunan Province (18A024).
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Zhi Wang: conceptualization and methodology. Ou-lin Dai: data curation, writing original draft, and visualization. Zi-yan Lei: formal analysis and materials preparation. Yuan-de Peng: supervision.
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Dai, Ol., Lei, Zy., Peng, Yd. et al. Integrative analysis uncovers response mechanism of Pirata subpiraticus to chronic cadmium stress. Environ Sci Pollut Res 29, 90070–90080 (2022). https://doi.org/10.1007/s11356-022-22043-7
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DOI: https://doi.org/10.1007/s11356-022-22043-7