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Zhang Y, Zhao C, Zhang H, Liu R, Wang S, Pu Y, Yin L. Integrating transcriptomics and behavior tests reveals how the C. elegans responds to copper induced aging. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 222:112494. [PMID: 34265532 DOI: 10.1016/j.ecoenv.2021.112494] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/28/2021] [Accepted: 07/03/2021] [Indexed: 06/13/2023]
Abstract
Copper (Cu) pollution in water and agricultural soil has always been a worldwide concern. This research aims to investigate the health effects of copper exposure on Caenorhabditis elegans (C. elegans) under the existing environmental quality standards (1 mg/L and 2 mg/L) via lifespan, reproduction, biological markers and transcriptome analysis. The results showed that copper of these two environmental standards shorten the lifespan of nematodes, reduced the brood size, reduced the frequency of pharyngeal pumps and prolonged defecation time as aging-related behaviors, and increased the levels of aging-related markers ROS, MDA and H2O2. There was a certain effect trend for the two exposure concentrations. Further, the possible molecular mechanism of copper-induced aging and reproductive effects on C. elegans was explored. Differential gene expression analysis was performed, and 2332 genes (567 up- and 1765 down-regulated genes) in the 1 mg/L group, 2449 DEGs (724 up- and 1725 down-regulated genes) in the 2 mg/L group in response to copper treatment. The top 20 regulated genes were vit (vit-1, vit-3, vit-4) genes, col genes (col-35, col-72, col-114, col-123, col-164, col-183, col-185), eea-1, him-18 and grl-20, which suggested that cuticle collagen synthesis and yolk expression were disrupted by copper. Analysis of KEGG pathway showed copper exposure widely affects longevity regulation pathways, thereby promoting aging. In summary, the sequencing results extensively and deeply reveal the health hazards of environmentally relevant doses of copper exposure to C. elegans, and behavioral testing verified that copper promoted aging of C. elegans.
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Affiliation(s)
- Ying Zhang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Chao Zhao
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Hu Zhang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Ran Liu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Shizhi Wang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Yuepu Pu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Lihong Yin
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
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Starnes DL, Lichtenberg SS, Unrine JM, Starnes CP, Oostveen EK, Lowry GV, Bertsch PM, Tsyusko OV. Distinct transcriptomic responses of Caenorhabditis elegans to pristine and sulfidized silver nanoparticles. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 213:314-321. [PMID: 26925754 DOI: 10.1016/j.envpol.2016.01.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 12/23/2015] [Accepted: 01/07/2016] [Indexed: 06/05/2023]
Abstract
Manufactured nanoparticles (MNP) rapidly undergo aging processes once released from products. Silver sulfide (Ag2S) is the major transformation product formed during the wastewater treatment process for Ag-MNP. We examined toxicogenomic responses of pristine Ag-MNP, sulfidized Ag-MNP (sAg-MNP), and AgNO3 to a model soil organism, Caenorhabditis elegans. Transcriptomic profiling of nematodes which were exposed at the EC30 for reproduction for AgNO3, Ag-MNP, and sAg-MNP resulted in 571 differentially expressed genes. We independently verified expression of 4 genes (numr-1, rol-8, col-158, and grl-20) using qRT-PCR. Only 11% of differentially expressed genes were common among the three treatments. Gene ontology enrichment analysis also revealed that Ag-MNP and sAg-MNP had distinct toxicity mechanisms and did not share any of the biological processes. The processes most affected by Ag-MNP relate to metabolism, while those processes most affected by sAg-MNP relate to molting and the cuticle, and the most impacted processes for AgNO3 exposed nematodes was stress related. Additionally, as observed from qRT-PCR and mutant experiments, the responses to sAg-MNP were distinct from AgNO3 while some of the effects of pristine MNP were similar to AgNO3, suggesting that effects from Ag-MNP is partially due to dissolved silver ions.
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Affiliation(s)
- Daniel L Starnes
- Department of Plant and Soil Sciences, University of Kentucky, 1100 South Limestone Street, Lexington, KY 40546, United States
| | - Stuart S Lichtenberg
- Department of Plant and Soil Sciences, University of Kentucky, 1100 South Limestone Street, Lexington, KY 40546, United States; Center for Environmental Implications of NanoTechnology (CEINT), P.O. Box 90287, Duke University, Durham, NC 27708-0287, United States
| | - Jason M Unrine
- Department of Plant and Soil Sciences, University of Kentucky, 1100 South Limestone Street, Lexington, KY 40546, United States; Center for Environmental Implications of NanoTechnology (CEINT), P.O. Box 90287, Duke University, Durham, NC 27708-0287, United States
| | - Catherine P Starnes
- Department of Statistics, University of Kentucky, 725 Rose Street, MDS Building 305, Lexington, KY 40536, United States
| | - Emily K Oostveen
- Department of Plant and Soil Sciences, University of Kentucky, 1100 South Limestone Street, Lexington, KY 40546, United States
| | - Gregory V Lowry
- Center for Environmental Implications of NanoTechnology (CEINT), P.O. Box 90287, Duke University, Durham, NC 27708-0287, United States; Department of Civil & Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Paul M Bertsch
- Department of Plant and Soil Sciences, University of Kentucky, 1100 South Limestone Street, Lexington, KY 40546, United States; Center for Environmental Implications of NanoTechnology (CEINT), P.O. Box 90287, Duke University, Durham, NC 27708-0287, United States; Division of Land and Water, CSIRO, Ecosciences Precinct, Brisbane, QLD, Australia
| | - Olga V Tsyusko
- Department of Plant and Soil Sciences, University of Kentucky, 1100 South Limestone Street, Lexington, KY 40546, United States; Center for Environmental Implications of NanoTechnology (CEINT), P.O. Box 90287, Duke University, Durham, NC 27708-0287, United States.
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Abstract
Hormones play a critical role in driving major stage transitions and developmental timing events in many species. In the nematode C. elegans the steroid hormone receptor, DAF-12, works at the confluence of pathways regulating developmental timing, stage specification, and longevity. DAF-12 couples environmental and physiologic signals to life history regulation, and it is embedded in a rich architecture governing diverse processes. Here, we highlight the molecular insights, extraordinary circuitry, and signaling pathways governing life stage transitions in the worm and how they have yielded fundamental insights into steroid regulation of biological time.
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Affiliation(s)
- Adam Antebi
- Max Planck Institute for Biology of Ageing, Cologne, Germany.
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