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Gogoi B, Acharjee SA, Bharali P, Sorhie V, Walling B, Alemtoshi. A critical review on the ecotoxicity of heavy metal on multispecies in global context: A bibliometric analysis. ENVIRONMENTAL RESEARCH 2024; 248:118280. [PMID: 38272294 DOI: 10.1016/j.envres.2024.118280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 01/27/2024]
Abstract
Heavy metals (HMs) have become a significant concern in the current era, with deleterious effects on diverse living organisms when exposed beyond threshold concentrations. Both nature and human beings have been constantly casting out HMs into environmental matrices through various activities. Innumerable cases of threatened diseases such as cancer, respiratory ailments, reproductive defects, skin diseases, and several others have been a cause of significant concern for humans as the number of instances has been increasing with each decade. HMs migrates via several pathways to infiltrate biological organisms and amass within them. Even though numerous treatment approaches are available for remediating HM pollution, however, they are expensive, along with other setbacks. Due to such constraints, combating HM contamination requires environmentally conscious strategies like bioremediation, which employs an array of biological systems to remove HMs from the environment. Nonetheless, to address the current global HM pollution situation, it is critical to comprehend not only how these hazardous HMs cause toxicity in various living organisms but also the knowledge gaps that currently exist concerning the subject of HM ecotoxicity. In the present investigation, data was extracted from Google Scholar using software program called Harzing's Publish or Perish. The collected information has been subsequently displayed as a network file using the VOSViewer software tool. Thus, the current review presents a significant insight with the inclusion of a readily accessible bibliometric analysis to comprehend the present status of HMs research, global research trends, existing knowledge discrepancies, and research challenges. Further, it also provides an in-depth review of HMs ecotoxicity, with a focus on arsenic (As), cadmium (Cd), and lead (Pb). Thus, as indicated by the bibliometric study, the present review will assist future investigators studying HMs ecotoxicity by providing baseline data concerning a wide range of living organisms and by addressing research gaps.
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Affiliation(s)
- Bhagyudoy Gogoi
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, HQ: Lumami, Zunheboto-798627, Nagaland, India
| | - Shiva Aley Acharjee
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, HQ: Lumami, Zunheboto-798627, Nagaland, India
| | - Pranjal Bharali
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, HQ: Lumami, Zunheboto-798627, Nagaland, India.
| | - Viphrezolie Sorhie
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, HQ: Lumami, Zunheboto-798627, Nagaland, India
| | - Bendangtula Walling
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, HQ: Lumami, Zunheboto-798627, Nagaland, India
| | - Alemtoshi
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, HQ: Lumami, Zunheboto-798627, Nagaland, India
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2
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Motta CM, Rosati L, Cretì P, Montinari MR, Denre P, Simoniello P, Fogliano C, Scudiero R, Avallone B. Histopathological effects of long-term exposure to realistic concentrations of cadmium in the hepatopancreas of Sparus aurata juveniles. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2024; 268:106858. [PMID: 38325058 DOI: 10.1016/j.aquatox.2024.106858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 01/25/2024] [Accepted: 02/02/2024] [Indexed: 02/09/2024]
Abstract
In recent decades, cadmium has emerged as an environmental stressor in aquatic ecosystems due to its persistence and toxicity. It can enter water bodies from various natural and anthropogenic sources and, once introduced into aquatic systems, can accumulate in sediments and biota, leading to bioaccumulation and biomagnification in the food chain. For this reason, the effects of cadmium on aquatic life remain an area of ongoing research and concern. In this paper, a multidisciplinary approach was used to assess the effects of long-term exposure to an environmental concentration on the hepatopancreas of farmed juveniles of sea bream, Sparus aurata. After determining metal uptake, metallothionein production was assessed to gain insight into the organism's defence response. The effects were also assessed by histological and ultrastructural analyses. The results indicate that cadmium accumulates in the hepatopancreas at significant concentrations, inducing structural and functional damage. Despite the parallel increase in metallothioneins, fibrosis, alterations in carbohydrate distribution and endocrine disruption were also observed. These effects would decrease animal fitness although it did not translate into high mortality or reduced growth. This could depend on the fact that the animals were farmed, protected from the pressure deriving from having to search for food or escape from predators. Not to be underestimated is the return to humans, as this species is edible. Understanding the behaviour of cadmium in aquatic systems, its effects at different trophic levels and the potential risks to human health from the consumption of contaminated seafood would therefore be essential for informed environmental management and policy decisions.
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Affiliation(s)
| | - Luigi Rosati
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Patrizia Cretì
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - Maria Rosa Montinari
- Chair of History of Medicine, Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - Pabitra Denre
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Palma Simoniello
- Department of Science and Technology, University of Naples Parthenope, Naples, Italy
| | - Chiara Fogliano
- Department of Biology, University of Naples Federico II, Naples, Italy.
| | - Rosaria Scudiero
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Bice Avallone
- Department of Biology, University of Naples Federico II, Naples, Italy
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3
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Brix KV, Baken S, Poland CA, Blust R, Pope LJ, Tyler CR. Challenges and Recommendations in Assessing Potential Endocrine-Disrupting Properties of Metals in Aquatic Organisms. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:2564-2579. [PMID: 37671843 DOI: 10.1002/etc.5741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 07/25/2023] [Accepted: 08/29/2023] [Indexed: 09/07/2023]
Abstract
New tools and refined frameworks for identifying and regulating endocrine-disrupting chemicals (EDCs) are being developed as our scientific understanding of how they work advances. Although focus has largely been on organic chemicals, the potential for metals to act as EDCs in aquatic systems is receiving increasing attention. Metal interactions with the endocrine system are complicated because some metals are essential to physiological systems, including the endocrine system, and nonessential metals can have similar physiochemical attributes that allow substitution into or interference with these systems. Consequently, elevated metal exposure could potentially cause endocrine disruption (ED) but can also cause indirect effects on the endocrine system via multiple pathways or elicit physiologically appropriate compensatory endocrine-mediated responses (endocrine modulation). These latter two effects can be confused with, but are clearly not, ED. In the present study, we provide several case studies that exemplify the challenges encountered in evaluating the endocrine-disrupting (ED) potential of metals, followed by recommendations on how to meet them. Given that metals have multiple modes of action (MOAs), we recommend that assessments use metal-specific adverse outcome pathway networks to ensure that accurate causal links are made between MOAs and effects on the endocrine system. We recommend more focus on establishing molecular initiating events for chronic metal toxicity because these are poorly understood and would reduce uncertainty regarding the potential for metals to be EDCs. Finally, more generalized MOAs such as oxidative stress could be involved in metal interactions with the endocrine system, and we suggest it may be experimentally efficient to evaluate these MOAs when ED is inferred. These experiments, however, must provide explicit linkage to the ED endpoints of interest. Environ Toxicol Chem 2023;42:2564-2579. © 2023 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Kevin V Brix
- EcoTox, Miami, Florida, USA
- Rosenstiel School of Marine, Atmospheric & Earth Science, University of Miami, Miami, Florida, USA
| | - Stijn Baken
- International Copper Association, Brussels, Belgium
| | - Craig A Poland
- Regulatory Compliance Limited, Loanhead, United Kingdom
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Ronny Blust
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | | | - Charles R Tyler
- Biosciences, Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom
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4
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Das S, Kar I, Patra AK. Cadmium induced bioaccumulation, histopathology, gene regulation in fish and its amelioration - A review. J Trace Elem Med Biol 2023; 79:127202. [PMID: 37263063 DOI: 10.1016/j.jtemb.2023.127202] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 05/03/2023] [Accepted: 05/14/2023] [Indexed: 06/03/2023]
Abstract
Different anthropogenic activities as well as natural sources contribute enormously towards various heavy metal contaminations in aquatic habitats. Cadmium (Cd) is one of most prevalent and toxic heavy metals with a long half life. Unlike terrestrial animals, exposure of Cd in fishes may happen not only through feeds but also from its habitat water. Bioaccumulation of Cd in fishes occurs in many tissues, but mainly in gill, liver, kidney, skin, and muscle. The concentrations of Cd in fish tissues depend upon the extent and duration of Cd exposure, species and age of fishes, dietary minerals and antioxidant concentrations, and habitat water quality. Specific histopathological observations in liver, kidney, and gill are useful to understand the effects of Cd, which could help to determine the ameliorating methods to be adopted. Exposure of Cd exerts several adverse effects on general growth and development, reproductive processes, osmoregulation, morphological and histological structures, stress tolerance, and endocrine system, mainly due to changes in biological functions induced by differential expressions of several genes related to oxidative stress, apoptosis, inflammation, immunosuppressions, genotoxicity, Cd chelation and carbohydrate metabolism. Chronic biomagnifications of Cd exceeding the permitted level may be harmful not only to the fishes itself but also to humans through food chains. Amelioration of such toxic heavy metal that has been categorized as a potent carcinogenic in humans is of utmost importance. Main modes of amelioration encompas reducing oxidative damages by promoting the antioxidative defenses, decreasing Cd absorption, increasing excretion through excretory system and improving the tolerance of fishes to Cd toxicity. Many amelioration measures such as use of minerals (for example, zinc, calcium, and iron), vitamins (vitamin C, A, and E), different herbs, probiotics and other agents (taurine, bentonite, chitosan, zeolite, and metallothionein) have been explored for their effective roles to reduce Cd bioaccumulation and toxicity symptoms in fishes. The present review discusses bioaccumulation of Cd, histopathological alterations, oxidative stress, synergism-antagonism, and gene regulation in different tissues, and its amelioration measures in fishes.
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Affiliation(s)
- Srinibas Das
- Department of Fish Nutrition, West Bengal University of Animal and Fishery Sciences, Kolkata, West Bengal, India
| | - Indrajit Kar
- Department of Avian Sciences, West Bengal University of Animal and Fishery Sciences, Mohanpur, Nadia, West Bengal, India.
| | - Amlan Kumar Patra
- Department of Animal Nutrition, West Bengal University of Animal and Fishery Sciences, Kolkata, West Bengal, India.
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5
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Bhat RA, Saoca C, Cravana C, Fazio F, Guerrera MC, Labh SN, Kesbiç OS. Effects of heavy pollution in different water bodies on male rainbow trout (Oncorhynchus mykiss) reproductive health. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:23467-23479. [PMID: 36322349 DOI: 10.1007/s11356-022-23670-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
This research aimed to investigate the influence of heavy metals on the reproductive health of rainbow trout (Oncorhynchus mykiss) captured from two locations, Verinag (S1) and Panzath (S2). Sixty (n. 60) mature rainbow trout samples (30 from each site) with body weights ranging from 400 to 650 g were collected from Verinag hatchery, which was less polluted (S1), and Panzath hatchery, which was more polluted (S2). The findings revealed significant differences between the two sites, S1 (less polluted) and S2 (more polluted), as well as significant variations within the tissues. Iron (Fe) and Zinc (Zn) were found to be highest in sampling water as well as in fish tissues sampled from S2 sites. Similarly, concerning S1 captured fishes, histopathological examination of testes from S2 captured fish was found. Testicular abnormalities that included disorganization of the seminiferous tubules, reduction in the number of germ cells (sperm cells, spermatozoa), vacuolization, and large empty areas in the seminiferous epithelium were found. In testicular cells, the frequency of apoptotic cells collected from S2 water increased significantly (P < 0.05). SOD, catalase, and glutathione peroxidase activity increased in S1 captured fishes but decreased in S2 captured fishes. MDA levels gradually increased in S2 captured fish, and the degree of heavy metal stress was positively correlated (P < 0.05). In male rainbow trout, testosterone and 11-ketotestosterone levels increased substantially in S1 captured fishes. While the fatty acids of testes in S2 fishes decreased with respect to S1 fishes. In conclusion, S2 captured fish suffered more damage due to heavy metals including cellular damage, apoptosis, oxidative damage, and altered steroid hormones when compared to fish from S1 waters.
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Affiliation(s)
| | - Concetta Saoca
- Department of Clinical and Experimental Medicine, AOU "G. Martino, " University of Messina, Via Consolare Valeria 1, 98125, Messina, Italy
| | - Cristina Cravana
- Department of Veterinary Sciences, University of Messina, Polo Universitario Dell'Annunziata, Viale Palatucci snc, 98168, Messina, Italy
| | - Francesco Fazio
- Department of Veterinary Sciences, University of Messina, Polo Universitario Dell'Annunziata, Viale Palatucci snc, 98168, Messina, Italy
| | - Maria Cristina Guerrera
- Department of Veterinary Sciences, University of Messina, Polo Universitario Dell'Annunziata, Viale Palatucci snc, 98168, Messina, Italy.
| | - Shyam Narayan Labh
- Department of Zoology, Amrit Campus, Tribhuvan University, Kathmandu, Nepal
| | - Osman Sabri Kesbiç
- Department of Animal Nutrition and Nutritional Diseases, Veterinary Faculty, Kastamonu University, 37150, Kastamonu, Turkey
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6
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Shahjahan M, Taslima K, Rahman MS, Al-Emran M, Alam SI, Faggio C. Effects of heavy metals on fish physiology - A review. CHEMOSPHERE 2022; 300:134519. [PMID: 35398071 DOI: 10.1016/j.chemosphere.2022.134519] [Citation(s) in RCA: 92] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/22/2022] [Accepted: 04/02/2022] [Indexed: 06/14/2023]
Abstract
The pollution by heavy metals poses a serious threat to the aquatic environment and to the organisms if the concentration of heavy metals in the environment exceeds the safe limits. Due to their non-biodegradable and long persistence nature in the environment, heavy metals cause toxicity in fish by producing oxygen reactive species through oxidizing radical production. In this review, we investigated the effects of heavy metals on fish physiology with special emphasis on hemato-biochemical properties, immunological parameters especially hormones and enzymes, histopathology of different major organs and underlying molecular mechanisms. All those parameters are significantly affected by heavy metal exposure and are found to be important bio-monitoring tools to assess heavy metal toxicity. Hematological and biochemical alterations have been documented including cellular and nuclear abnormalities in different fish species exposed to different concentrations of heavy metals. Major fish organs (gills, liver, kidneys) including intestine, muscles showed different types of pathology specific to organs in acute and chronic exposure to different heavy metals. This study also revealed the expression of different genes involved in oxidative stress and detoxification of heavy metals. In a nutshell, this article shades light on the manipulation of fish physiology by the heavy metals and sought attention in the prevention and maintenance of aquatic environments particularly from heavy metals contaminations.
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Affiliation(s)
- Md Shahjahan
- Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
| | - Khanam Taslima
- Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Mohammad Shadiqur Rahman
- Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University, Melandah, Jamalpur, Bangladesh
| | - Md Al-Emran
- Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Shanon Iffat Alam
- Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Caterina Faggio
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166, S.Agata-Messina, Italy
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7
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Hegeman KA, Marlatt VL. Reproductive and thyroid endocrine axis cross-talk in rainbow trout (Oncorhynchus mykiss) alevins. Gen Comp Endocrinol 2021; 312:113855. [PMID: 34284022 DOI: 10.1016/j.ygcen.2021.113855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 06/08/2021] [Accepted: 07/14/2021] [Indexed: 11/18/2022]
Abstract
The goal of this study was to characterize morphological and molecular effects in rainbow trout alevins after waterborne exposures to 17β-estradiol (E2; 0.0008 to 0.5 μg/L), triiodothyronine (T3; 0.52 to 65 μg/L), and various co-treatments for 21 to 23 days. Interestingly, there was no consistent evidence that E2 alone influenced growth, development or deformity rates, however, 65 μg/L T3 alone expedited development, and both 13 μg/L and 65 μg/L alone caused a unique opercular deformity not previously reported. In addition, some potentiation between E2 and T3 at lower concentrations suggests some cross-talk between these two hormonal pathways may also contribute to the development of this opercular deformity. Gene expression changes were observed, including induction of vtg in rainbow trout alevins at 0.02 μg/L concentration of E2, which is the lowest concentration reported to induce vtg in rainbow trout alevins. These data suggest low-level E2 does not negate abnormal growth and development caused by hyperthyroidism, and examining more time points is likely required to demonstrate a stronger response profile for individual hormones and endocrine axes cross-talk.
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Affiliation(s)
- Kevin A Hegeman
- Simon Fraser University, Department of Biological Sciences, 8888 University Dr, Burnaby, BC V5A 1S6, Canada.
| | - Vicki L Marlatt
- Simon Fraser University, Department of Biological Sciences, 8888 University Dr, Burnaby, BC V5A 1S6, Canada
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Nowosad J, Kucharczyk D, Szmyt M, Łuczynska J, Tamás M, Horváth L. Changes in Cadmium Concentration in Muscles, Ovaries, and Eggs of Silver European Eel ( Anguilla anguilla) during Maturation under Controlled Conditions. Animals (Basel) 2021; 11:1027. [PMID: 33916407 PMCID: PMC8066507 DOI: 10.3390/ani11041027] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 03/30/2021] [Accepted: 04/02/2021] [Indexed: 12/23/2022] Open
Abstract
This study determined the contents of cadmium (Cd) in the muscles, ovaries, and eggs of silver female European eels. The analysis of cadmium content was performed on female European eels caught during commercial fishing in freshwater in Warmia and Mazury (Poland), and then subjected to artificial maturation and ovulation processing under controlled conditions. The content of cadmium (Cd) in the tissues was determined by flameless atomic spectrometry using an electrothermal atomizer. The analysis showed statistically significant differences between the cadmium content in the muscles, ovaries, and eggs (p < 0.05) of female European eels. The lowest cadmium content was found in the muscle tissue (0.0012 ± 0.0001 mg kg-1 wet weight) and the highest in eggs (after ovulation) (0.0038 ± 0.0007 mg kg-1 wet weight). Moreover, a relationship was found between the cadmium content in the muscle tissue and the ovaries (R = 0.673; p = 0.0117) in the same fish. The movement of cadmium from tissues to oocytes may indicate a significant problem concerning this heavy metal content in the reproduction of European eel.
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Affiliation(s)
- Joanna Nowosad
- Department of Ichthyology and Aquaculture, Faculty of Animal Bioengineering, University of Warmia and Mazury, 10-719 Olsztyn, Poland; (J.N.); (M.S.)
- ChemProf, 11-041 Olsztyn, Poland
| | - Dariusz Kucharczyk
- Department of Ichthyology and Aquaculture, Faculty of Animal Bioengineering, University of Warmia and Mazury, 10-719 Olsztyn, Poland; (J.N.); (M.S.)
| | - Mariusz Szmyt
- Department of Ichthyology and Aquaculture, Faculty of Animal Bioengineering, University of Warmia and Mazury, 10-719 Olsztyn, Poland; (J.N.); (M.S.)
| | - Joanna Łuczynska
- Department of Commodity and Food Analysis, University of Warmia and Mazury, 10-726 Olsztyn, Poland;
| | - Müller Tamás
- Department of Freshwater Fish Ecology, Hungarian University of Agricultural and Life Sciences, 2100 Gödöllő, Hungary;
| | - László Horváth
- Department of Aquaculture, Hungarian University of Agricultural and Life Sciences, 2100 Gödöllő, Hungary;
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9
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Prepubertal exposure to high dose of cadmium induces hypothalamic injury through transcriptome profiling alteration and neuronal degeneration in female rats. Chem Biol Interact 2021; 337:109379. [PMID: 33453195 DOI: 10.1016/j.cbi.2021.109379] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/23/2020] [Accepted: 01/10/2021] [Indexed: 11/20/2022]
Abstract
Cadmium (Cd) is a toxic metal, which seems to be crucial during the prepubertal period. Cd can destroy the structural integrity of the blood-brain barrier (BBB) and enters into the brain. Although the brain is susceptible to neurotoxicity induced by Cd, the effects of Cd on the brain, particularly hypothalamic transcriptome, are still relatively poorly understood. Therefore, we investigated the molecular effects of Cd exposure on the hypothalamus by profiling the transcriptomic response of the hypothalamus to high dose of Cd (25 mg/kg bw/day cadmium chloride (CdCl2)) during the prepubertal period in Sprague-Dawley female rats. After sequencing and annotation, differential expression analysis revealed 1656 genes that were differentially expressed that 108 of them were classified into 37 transcription factor (TF) families. According to gene ontology (GO) annotation and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, these differentially expressed genes (DEGs) were involved in different biological processes and neurological disorders including Alzheimer's disease (AD), Huntington's disease (HD), and Parkinson's disease (PD), prolactin signaling pathway, PI3K/Akt signaling, and dopaminergic synapse. Five transcripts were selected for further analyses with Real-time quantitative PCR (RT-qPCR). The RT-qPCR results were mostly consistent with those from the high throughput RNA sequencing (RNA-seq). Cresyl violet staining clearly showed an increased neuronal degeneration in the dorsomedial hypothalamus (DMH) and arcuate (Arc) nuclei of the CdCl2 group. Overall, this study demonstrates that prepubertal exposure to high doses of Cd induces hypothalamic injury through transcriptome profiling alteration in female rats, which reveals the new mechanisms of pathogenesis of Cd in the hypothalamus.
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Lead, Mercury and Cadmium in Fish and Shellfish from the Indian Ocean and Red Sea (African Countries): Public Health Challenges. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2020. [DOI: 10.3390/jmse8050344] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The main aim of this review was to assess the incidence of Pb, Hg and Cd in seafood from African countries on the Indian and the Red Sea coasts and the level of their monitoring and control, where the direct consumption of seafood without quality control are frequently due to the poverty in many African countries. Some seafood from African Indian and the Red Sea coasts such as mollusks and fishes have presented Cd, Pb and Hg concentrations higher than permitted limit by FAOUN/EU regulations, indicating a possible threat to public health. Thus, the operationalization of the heavy metals (HM) monitoring and control is strongly recommended since these countries have laboratories with minimal conditions for HM analysis.
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11
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Gárriz Á, Del Fresno PS, Carriquiriborde P, Miranda LA. Effects of heavy metals identified in Chascomús shallow lake on the endocrine-reproductive axis of pejerrey fish (Odontesthes bonariensis). Gen Comp Endocrinol 2019; 273:152-162. [PMID: 29940183 DOI: 10.1016/j.ygcen.2018.06.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 06/14/2018] [Accepted: 06/21/2018] [Indexed: 10/28/2022]
Abstract
Some heavy metals related to human activities were measured in the water of Chascomús lake. The maximum concentrations were: 0.23 μg/L for Cd, 4.28 μg/L for Cr, 22.09 μg/L for Cu, 2.49 μg/L for Ni, 3.24 μg/L for Pb and 210.76 μg/L for Zn. The values of Cd, Cr, Cr, Pb and Zn were above the Argentine National Guidelines for the Protection of the Aquatic life. The analysis of gonadal condition of pejerrey fish (Odontesthes bonariensis) from this lake did not revealed any reproductive damages. However, exposures with environmental concentrations of Cd, Cr, Cu and Zn under laboratory conditions of pejerrey males (14 days), caused a significant increase of the expression of the three variants of gnrh in the brain (within Cd exposure) and a decrease in cyp19a1b mRNA (within Cu exposure). Furthermore, at pituitary level, a decrease in fshb transcript levels was observed in the fish exposed to Cd and Cr and a decrease in the expression of both gonadotropin receptors at gonadal level in Zn exposure. Moreover, the gonads of the fish exposed to all the tested metals suffered structural damages showing shortness of the spermatic lobules, fibrosis, testis ova and the presence of piknotic cells. All these findings alert that heavy metals pollution affects the expression of key reproductive genes and gonadal structure of fish species that represent the predominant group of organisms and are considered sentinel species in the aquatic ecosystems.
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Affiliation(s)
- Ángela Gárriz
- Laboratorio de Ictiofisiología y Acuicultura, Instituto de Investigaciones Biotecnológicas Instituto Tecnológico de Chascomús "Dr. Raúl Alfonsín", IIB-INTECH (CONICET-UNSAM), Calle Intendente Marino Km. 8.200 (B7130IWA), Chascomús, Buenos Aires, Argentina
| | - Pamela S Del Fresno
- Laboratorio de Ictiofisiología y Acuicultura, Instituto de Investigaciones Biotecnológicas Instituto Tecnológico de Chascomús "Dr. Raúl Alfonsín", IIB-INTECH (CONICET-UNSAM), Calle Intendente Marino Km. 8.200 (B7130IWA), Chascomús, Buenos Aires, Argentina
| | - Pedro Carriquiriborde
- Centro de Investigaciones del Medio Ambiente (CIMA), Facultad de Ciencias Exactas, UNLP - CONICET, Calle 47 y 115, 1900 La Plata, Buenos Aires, Argentina
| | - Leandro A Miranda
- Laboratorio de Ictiofisiología y Acuicultura, Instituto de Investigaciones Biotecnológicas Instituto Tecnológico de Chascomús "Dr. Raúl Alfonsín", IIB-INTECH (CONICET-UNSAM), Calle Intendente Marino Km. 8.200 (B7130IWA), Chascomús, Buenos Aires, Argentina.
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12
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Faheem M, Jahan N, Khaliq S, Lone KP. Modulation of brain kisspeptin expression after bisphenol-A exposure in a teleost fish, Catla catla. FISH PHYSIOLOGY AND BIOCHEMISTRY 2019; 45:33-42. [PMID: 29971526 DOI: 10.1007/s10695-018-0532-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/22/2018] [Indexed: 06/08/2023]
Abstract
Endocrine-disrupting chemicals (EDCs) affect the neuroendocrine system which in turn influences the reproductive regulation. Neuronal genes disrupted by EDCs are the gonadotropin-releasing hormone (gnrh2), the Kiss/GPR54 system that regulates gonadotropin release and cyp19b gene encoding brain aromatase. In the present study, pubertal Catla catla expected to spawn for first the time in the coming season were exposed to graded concentration of bisphenol-A (10, 100, 1000 μg/l) for 14 days. Messenger RNA (mRNA) levels of neuroendocrine genes, i.e., kisspeptins and their receptors, gonadotropin-releasing hormone type II and brain aromatase were studied after 14 days exposure. Results showed that bisphenol-A (BPA) strongly upregulated expression of kiss1, kiss2, gpr54a, and gnrh2 in fish exposed to 10 μg/l BPA. Fish exposed to 1000 μg/l BPA, expression of kiss1 and gnrh2 were comparable to control while kiss2 mRNA increased compared to controls. Brain aromatase (cyp19b) mRNA expression increased in fish exposed to both 10 and 1000 μg/l BPA. These results indicate that BPA exposure can disrupt organization of the kisspeptin signaling pathways. This neuroendocrine disruption may be the underlying mechanism by which a suite of reproductive abnormalities are induced.
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Affiliation(s)
- Mehwish Faheem
- Department of Zoology, Government College University, Near Nasir Bagh, Katchery Road, Lahore, Pakistan.
| | - Nusrat Jahan
- Department of Zoology, Government College University, Near Nasir Bagh, Katchery Road, Lahore, Pakistan
| | - Saba Khaliq
- Department of Physiology and Cell biology, University of Health Sciences, Lahore, Pakistan
| | - Khalid Parvez Lone
- Department of Physiology and Cell biology, University of Health Sciences, Lahore, Pakistan
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13
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Płachetka-Bożek A, Kafel A, Augustyniak M. Reproduction and development of Spodoptera exigua from cadmium and control strains under differentiated cadmium stress. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 166:138-145. [PMID: 30265877 DOI: 10.1016/j.ecoenv.2018.09.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 08/29/2018] [Accepted: 09/02/2018] [Indexed: 06/08/2023]
Abstract
The growth and development of living organisms is programmed in genes, but exogenous factors (e.g. cadmium) may modulate endogenous information. Heavy metals may disturb physiological functions and accumulate in the tissues. The insects under prolonged heavy metal stress show some modifications in their metabolism management. The aim of this study was to compare the reproduction and development between individuals of S. exigua from the strain, exposed over 130 generations to sublethal concentration of cadmium (44 mg Cd/kg dry weight of larval diet), and the individuals from the control strain, both additionally exposed to different concentration of cadmium (22-704 mg Cd/kg dry weight of larval diet). The exposure to various cadmium concentrations in the diet revealed survival difference between the cadmium and the control animals at the larvae stage. The differences between adults were not evident. The telomere length (responsible for the duration of a lifespan) in the cadmium strain was shorter in the females than in the males and the individuals from the control strain. TERF1 gene expression (indirectly responsible for the telomere length) was higher in the individuals from the cadmium strain 24 hrs after eclosion. The significant reduction in the larvae body mass was observed in both strains, when the metal concentration was equal to or higher than 264 mg/kg dry weight of larval diet. The EC50 values (defined as of body mass loss), calculated 48 hours after cadmium exposure of individuals from control and cadmium strains, were respectively 632 and 725 mg Cd/kg dry weight of diet. However, some difference in reproduction (the total number of eggs laid and the oviposition time) between the strains appeared only in the groups fed on the uncontaminated diet. The control females laid almost two times more eggs than those from the cadmium strain, and the control ones had more than two times longer oviposition time than the females from the cadmium strain. The fluctuation was also noted in the size of eggs and the hatching success on the following days when both strains were compared, while the hatching success was higher for the insects from the cadmium strain. In conclusion, the insects from the cadmium strain are more resistant to cadmium contamination, as it is evidenced by the EC50 parameter. However, the females from the cadmium strain start laying eggs statistically later, have shorter telomeres and slightly reduced TERF1 gene expression, but hutching success in the strain is significantly higher when compared with the control individuals.
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Affiliation(s)
- Anna Płachetka-Bożek
- Department of Animal Physiology and Ecotoxicology, University of Silesia in Katowice, Bankowa 9, 40-007 Katowice, Poland.
| | - Alina Kafel
- Department of Animal Physiology and Ecotoxicology, University of Silesia in Katowice, Bankowa 9, 40-007 Katowice, Poland
| | - Maria Augustyniak
- Department of Animal Physiology and Ecotoxicology, University of Silesia in Katowice, Bankowa 9, 40-007 Katowice, Poland
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14
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Togno-Peirce C, Limón-Morales O, Montes-López S, Rojas-Castañeda J, Márquez-Aguiluz D, Bonilla-Jaime H, Arteaga-Silva M. Pleiotropic Effects of Cadmium Toxicity on the Neuroendocrine-Immune Network. ACTA ACUST UNITED AC 2018. [DOI: 10.3233/nib-180138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Cristián Togno-Peirce
- Department of Biology of Reproduction, DCBS, The Metropolitan Autonomous University-Iztapalapa, Mexico City, Mexico
| | - Ofelia Limón-Morales
- Department of Biology of Reproduction, DCBS, The Metropolitan Autonomous University-Iztapalapa, Mexico City, Mexico
| | - Sergio Montes-López
- Department of Neurochemistry, National Institute of Neurology and Neurosurgery “Dr. Manuel Velasco Suarez”, Mexico City, Mexico
| | | | - Darla Márquez-Aguiluz
- Department of Biology of Reproduction, DCBS, The Metropolitan Autonomous University-Iztapalapa, Mexico City, Mexico
| | - Herlinda Bonilla-Jaime
- Department of Biology of Reproduction, DCBS, The Metropolitan Autonomous University-Iztapalapa, Mexico City, Mexico
| | - Marcela Arteaga-Silva
- Department of Biology of Reproduction, DCBS, The Metropolitan Autonomous University-Iztapalapa, Mexico City, Mexico
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15
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Jovanovic Z, Mihaljevic O, Kostic I. Effects of Divalent Cations on Outward Potassium Currents in Leech Retzius Nerve Cells. SERBIAN JOURNAL OF EXPERIMENTAL AND CLINICAL RESEARCH 2016. [DOI: 10.1515/sjecr-2016-0029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractThe present study examines the effects of divalent metals, cadmium (Cd2+) and manganese (Mn2+), on the outward potassium currents of Retzius cells in the hirudinid leeches Haemopis sanguisuga using conventional two-microelectrode voltageclamp techniques. The outward potassium current is activated by depolarization and plays an important role in determining both the neuronal excitability and action potential duration. A strong inhibition of the fast current and a clear reduction in the late currents of the outward current with 1 mM Cd2+were obtained, which indicated that both components are sensitive to this metal. Complete blockage of the fast and partial reduction of the slow outward currents was observed after adding 1 mM Mn2+to the extracellular fluid. These data show that the outward K+current in leech Retzius nerve cells comprises at least two components: a voltage-dependent K+current and a Ca2+- activated K+current. These observations also indicate that Cd2+is more eff ective than Mn2+in blocking ion fl ow through these channels and that suppressing Ca2+-activated K+outward currents can prolong the action potential in nerve cells.
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Affiliation(s)
- Zorica Jovanovic
- Faculty of Medical Science, University of Kragujevac, Svetozara Markovica 69, 34 000 Kragujevac, Serbia
| | - Olgica Mihaljevic
- Department of Pathological Physiology, Faculty of Medical Sciences, University of Kragujevac, Serbia
| | - Irena Kostic
- Department of Pathological Physiology, Faculty of Medical Sciences, University of Kragujevac, Serbia
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16
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Chen YY, Chan KM. Regulation of vitellogenin (vtg1) and estrogen receptor (er) gene expression in zebrafish (Danio rerio) following the administration of Cd²⁺ and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). CHEMOSPHERE 2016; 147:467-476. [PMID: 26799766 DOI: 10.1016/j.chemosphere.2015.12.083] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 12/21/2015] [Accepted: 12/22/2015] [Indexed: 06/05/2023]
Abstract
We evaluated the individual and joint estrogenic effects of cadmium (Cd(2+)) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in the zebrafish liver (ZFL) cell line, zebrafish embryo, larvae and the liver of adult zebrafish. The mRNA expression of vtg1 was inhibited by Cd(2+), but unaffected by TCDD in ZFL cells. Similar changes in the mRNA levels of ERα, ERβ1, ERβ2 and GPER (G protein coupled estrogen receptor) in ZFL cells were also observed. Deletion mutants of vtg1 gene promoters were constructed to investigate transcriptional regulation, and we found that all of the constructs failed to respond to TCDD or Cd(2+). However, after co-transfection with a vtg1 promoter-luciferase construct to the ERα, ERβ1, ERβ2 and GPER expression vectors, decreased luciferase activity was observed in the ERα co-transfection group after treatment with Cd(2+), suggesting that ERα participates in vtg1 transcriptional regulation and is affected by Cd(2+). Differences in the regulation of the mRNA levels of these genes were also observed between different developmental stages and between the livers of male and female zebrafish.
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Affiliation(s)
- Ying Ying Chen
- School of Life Sciences, Chinese University, Sha Tin, Hong Kong SAR, China
| | - King Ming Chan
- School of Life Sciences, Chinese University, Sha Tin, Hong Kong SAR, China.
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17
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Jiang X, Guan X, Yao L, Zhang H, Jin X, Han Y. Effects of Single and Joint Subacute Exposure of Copper and Cadmium on Heat Shock Proteins in Common Carp (Cyprinus carpio). Biol Trace Elem Res 2016; 169:374-81. [PMID: 26105544 DOI: 10.1007/s12011-015-0402-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 06/08/2015] [Indexed: 10/23/2022]
Abstract
Copper (Cu) and cadmium (Cd) are the most common heavy metals that are easily detected in aquatic environments on a global scale. In this paper, we investigated the messenger RNA (mRNA) and protein levels of HSPs (HSP60, HSP70, and HSP90) in the liver of the common carp exposed to Cu, Cd, and a combination of both metals by real-time quantitative PCR and Western blot. The results indicated that in each exposure group, the mRNA levels of HSP60, HSP70, and HSP90 were increased significantly compared to the corresponding controls after 96 h of exposure (P < 0.05). A significant increase was observed in the HSP70 protein level in the high-dose Cu group and all of the Cd groups. Significant increases were also observed in the protein levels of HSP60 and HSP90 in the high combination group and the low combination group, respectively. These results indicated that the dynamics of HSP expression observed in the common carp support the role of HSPs as biochemical markers in response to environmental pollution and provided valuable insights into the adaptive mechanisms used by the common carp to adapt to the challenges of stressful environments.
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Affiliation(s)
- Xuyang Jiang
- College of Animal Science and Technology, Northeast Agricultural University, 59 Mucai Street, Harbin, 150030, People's Republic of China
- National and Local Joint Freshwater Fish Breeding Engineering Laboratory of China, 43 Songfa Street, Harbin, 150030, People's Republic of China
| | - Xueting Guan
- College of Animal Science and Technology, Northeast Agricultural University, 59 Mucai Street, Harbin, 150030, People's Republic of China
| | - Linlin Yao
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Harbin, 150030, People's Republic of China
| | - Hong Zhang
- College of Animal Science and Technology, Northeast Agricultural University, 59 Mucai Street, Harbin, 150030, People's Republic of China
| | - Xian Jin
- Harbin Academy of Agricultural Sciences, 5399 Wanbao Street, Harbin, 150030, People's Republic of China.
| | - Ying Han
- College of Animal Science and Technology, Northeast Agricultural University, 59 Mucai Street, Harbin, 150030, People's Republic of China.
- National and Local Joint Freshwater Fish Breeding Engineering Laboratory of China, 43 Songfa Street, Harbin, 150030, People's Republic of China.
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18
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Outerbridge ME, O'Riordan R, Fort DJ, Davenport J. Ecotoxicological assessment of diamondback terrapin (Malaclemys terrapin) pond habitat, prey and eggs in Bermuda. MARINE POLLUTION BULLETIN 2016; 102:36-43. [PMID: 26707979 DOI: 10.1016/j.marpolbul.2015.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 12/03/2015] [Accepted: 12/09/2015] [Indexed: 06/05/2023]
Abstract
Total petroleum hydrocarbons, PAH and various trace metal residues were extracted and analyzed from fresh whole diamondback terrapin (Malaclemys terrapin) eggs, whole brackish-water gastropods (terrapin prey) and benthic sediment from anchialine pond environments in Bermuda inhabited by terrapins. Gastropods and terrapin eggs showed higher concentrations of trace metals and organic contaminants than sediments. Conversely, PAHs were mostly found within the sediment and smaller amounts detected in gastropods and terrapin eggs. Results indicated that contaminants in prey were transferred to terrapin eggs, and that concentrations of several contaminants exceeded potentially toxic concentrations for aquatic vertebrates. Necropsy of unhatched eggs from nests that had yielded viable hatchlings showed significantly compromised embryonic development. Bermudian diamondback terrapins reside and feed in brackish wetland habitats characterized by widespread, multifactorial contamination. This study suggests that environmental contamination plays a role in the recorded low hatching success in terrapin eggs in Bermuda.
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Affiliation(s)
- Mark E Outerbridge
- Department of Conservation Services, Government of Bermuda, P.O. Box FL 145, FL BX, Bermuda.
| | - Ruth O'Riordan
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall Campus, Cork, Ireland.
| | - Douglas J Fort
- Fort Environmental Laboratories, 515 South Duncan, Stillwater, OK OK74074, USA.
| | - John Davenport
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall Campus, Cork, Ireland.
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19
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Driessnack MK, Matthews AL, Raine JC, Niyogi S. Interactive effects of chronic waterborne copper and cadmium exposure on tissue-specific metal accumulation and reproduction in fathead minnow (Pimephales promelas). Comp Biochem Physiol C Toxicol Pharmacol 2016; 179:165-73. [PMID: 26498072 DOI: 10.1016/j.cbpc.2015.10.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 10/16/2015] [Accepted: 10/16/2015] [Indexed: 01/04/2023]
Abstract
The present study was carried out to examine the interactive effects of chronic waterborne copper (Cu) and cadmium (Cd) on tissue-specific metal accumulation and reproduction in fathead minnow (Pimephales promelas). Trios (1 male: 2 female; n=5) of fish were exposed for 21days to: (i) control (no added Cu or Cd), (ii) waterborne Cu (75μg/L), (iii) waterborne Cd (5μg/L), and (iv) Cu and Cd mixture (75 and 5μg/L, respectively). Reproductive output (cumulative egg production) was significantly reduced by Cu but not by Cd. Interestingly however, no spawning occurred in fish exposed to the mixture of waterborne Cu and Cd. In general, both Cu and Cd accumulation in target tissues (gill, liver, gonad and carcass) increased significantly in fish exposed to Cu and Cd mixture, and no interaction between Cu and Cd accumulation was observed in any tissues, except in the liver where Cu accumulation was significantly reduced by Cd. The expression of female hepatic estrogen receptor genes (ER-α and ER-β) was most significantly elevated in fish exposed to Cu and Cd mixture, whereas vitellogenin gene expression was reduced maximally in the same exposure. Similarly, the hepatic expression of the metallothionein gene was most significantly upregulated in fish exposed to Cu and Cd mixture. Moreover, the circulating estradiol level in females was significantly decreased only during the co-exposure of waterborne Cu and Cd. Overall, the present study indicates that the interaction of chronic waterborne Cu and Cd exposure may elicit greater than additive effect on reproductive output in fish.
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Affiliation(s)
- Melissa K Driessnack
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada
| | - Amber L Matthews
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada
| | - Jason C Raine
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada
| | - Som Niyogi
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada; Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK, Canada.
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20
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Verderame M, Limatola E, Scudiero R. Estrogenic contamination by manure fertilizer in organic farming: a case study with the lizard Podarcis sicula. ECOTOXICOLOGY (LONDON, ENGLAND) 2016; 25:105-14. [PMID: 26475047 DOI: 10.1007/s10646-015-1571-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/09/2015] [Indexed: 05/20/2023]
Abstract
In the last years, worldwide organic farming has grown exponentially; as a consequence, the use of animal manure as a soil fertility source has become the principal agricultural choice. However, the use of manure as fertilizer can increase the amount of steroid hormone metabolites in the soil. In southern Italy, lacertidae lizards are the most abundant vertebrate group in agroecosystems and have been identified as potential model species for ecotoxicological studies. The aim of this study was to understand if the manure applied in organic farming has estrogen-like effects in the lizard Podarcis sicula. Adult male lizards were captured in two organic agricultural fields (manure-treated sites) and in an uncultivated field (control site). Lizards from the two organic farms displayed hepatic biosynthetic alterations typical of an estrogenic contamination; hepatocytes contained both vitellogenin and estrogen receptor alpha transcripts and proteins, detected by in situ hybridization and immunocytochemistry. The same cells did not show cadmium, lead and metallothionein accumulation, indicative of the lack of inorganic contamination. These findings suggest that exogenous estrogens, arising from the use of manure, could affect the welfare of wild animals and animal breeding, leading to bioaccumulation of estrogens in food chain, with possible risk for human consumers. For this reason, organic farming should implement the use of sustainable practices such as crop rotation to preserve the soil biological activity, rather than organic manure as fertilizer.
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21
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Gerbron M, Geraudie P, Xuereb B, Marie S, Minier C. In vitro and in vivo studies of the endocrine disrupting potency of cadmium in roach (Rutilus rutilus) liver. MARINE POLLUTION BULLETIN 2015; 95:582-589. [PMID: 26024563 DOI: 10.1016/j.marpolbul.2015.03.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 03/11/2015] [Accepted: 03/28/2015] [Indexed: 06/04/2023]
Abstract
Cadmium has been reported to exert estrogenic, antiestrogenic or both effects in vertebrate species. To elucidate the endocrine disrupting action of CdCl2, ex vivo and in vivo experiments were performed in roach (Rutilus rutilus). Roach liver explants were exposed to a range of CdCl2 concentrations alone (0.1-50μM) or with an effective concentration (100nM) of 17β-estradiol (E2). In addition, juvenile roach were intraperitoneally injected with CdCl2 (0.1-2.5mg/kg) with or without 1mg E2/kg. Subsequent analysis evaluated the effect of CdCl2 on vitellogenin (VTG) synthesis both at the mRNA and protein level, on estrogen receptors (erα and erβ1) and on androgen receptor (ar) mRNA expression. Ex vivo and in vivo experiments indicated that CdCl2 is strongly anti-estrogenic as, when co-exposed to E2, CdCl2 significantly inhibited VTG production as well as vtg and erα mRNA expressions. Moreover, CdCl2 compromised the E2-mediated induction of the ar mRNA expression in vivo.
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Affiliation(s)
- M Gerbron
- Laboratory of Ecotoxicology, ULH Normandie Université, SFR SACLE 4116, BP 540, 76058 Le Havre, France.
| | - P Geraudie
- Laboratory of Ecotoxicology, ULH Normandie Université, SFR SACLE 4116, BP 540, 76058 Le Havre, France; Akvaplan Niva as, Fram Centre, 9296 Tromsø, Norway
| | - B Xuereb
- Laboratory of Ecotoxicology, ULH Normandie Université, SFR SACLE 4116, BP 540, 76058 Le Havre, France
| | - S Marie
- Laboratory of Ecotoxicology, ULH Normandie Université, SFR SACLE 4116, BP 540, 76058 Le Havre, France
| | - C Minier
- Laboratory of Ecotoxicology, ULH Normandie Université, SFR SACLE 4116, BP 540, 76058 Le Havre, France
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22
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Olivares-Rubio HF, Dzul-Caamal R, Gallegos-Rangel ME, Madera-Sandoval RL, Domínguez-López ML, García-Latorre E, Vega-López A. Relationship between biomarkers and endocrine-disrupting compounds in wild Girardnichthys viviparus from two lakes with different degrees of pollution. ECOTOXICOLOGY (LONDON, ENGLAND) 2015; 24:664-685. [PMID: 25567190 DOI: 10.1007/s10646-014-1414-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/30/2014] [Indexed: 06/04/2023]
Abstract
Despite great efforts worldwide to evaluate the effects of endocrine-disrupting compounds (EDCs) in fish, there is little information available about the interactions of EDCs with the disruption of the sexual endocrine axis in fish species with matrotrophic viviparity and intraluminal gestation. To understand these interactions, six sampling campaigns were performed within a period of 1 year in two lakes with different degrees of pollution. A battery of biomarkers of the oestrogenic response was assessed in the liver [vitellogenin, CYP 1A1, epoxide hydrolase activity, and metallothioneins (MT)] and MT in the head of Girardinichthys viviparus. Linear correlation analysis and canonical correspondence analysis were performed to explore the relationship between the oestrogenic response with EDCs and with metals. The biomarker responses were assessed using the water content of EDCs (oestrone, 17-β-oestradiol, oestriol, 17-α-ethinyl oestradiol, total phenols, bisphenol A, nonyl phenol, octyl phenol), as well as the PAHs indene[1,2,3-c,d]pyrene, naphthalene, pyrene, benzo[a]anthracene, benzo[k]fluoranthene and benzo[a]pyrene) and metals (Cu, Fe, Mn, Pb and Zn). Greater disruption of the sexual endocrine axis occurred in fish of both sexes inhabiting the polluted lake whose effects were apparently influenced by CYP 1A1 activity and by 17-α-ethinyl oestradiol. In addition, non-estrogenic mechanisms in the hypothalamus and pituitary glands in male fish were observed, elicited by endogenous levels and the water concentration of Pb. In contrast, in females from the less polluted lake, VTG induction was related to exogenous oestrogens. The disruption of the hypothalamic-pituitary-gonadal axis is a complex process influenced by both endogenous and exogenous factors and contributes to male feminisation by exposure to EDCs.
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Affiliation(s)
- Hugo F Olivares-Rubio
- Laboratorio de Toxicología Ambiental, Escuela Nacional de Ciencias Biológicas, IPN, Wilfrido Massieu s/n, Unidad Profesional Zacatenco, CP 07839, Mexico, DF, Mexico
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23
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Wang Y, Ferrari MCO, Hoover Z, Yousafzai AM, Chivers DP, Niyogi S. The effects of chronic exposure to environmentally relevant levels of waterborne cadmium on reproductive capacity and behaviour in fathead minnows. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2014; 67:181-191. [PMID: 24658919 DOI: 10.1007/s00244-014-0018-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 03/10/2014] [Indexed: 06/03/2023]
Abstract
Cadmium (Cd) is a priority pollutant in aquatic ecosystems because of its highly toxic effects at low concentrations. Recent work has highlighted that at sublethal concentrations, Cd can impair the ability of fish to respond to important sensory cues. In the present study, we examined whether chronic exposure to environmentally relevant concentrations of waterborne Cd (1, 2.5 and 5 μg/L) can result in reproductive impairment in fathead minnows (Pimephales promelas) as measured by the standard Organization for Economic Cooperation and Development (OECD) 21-day reproductive assay. In addition, we also evaluated the effects of chronic waterborne Cd exposure on Cd accumulation in target tissues (liver and ovary) and plasma estradiol level in females and on the reproductive behaviour of fathead minnows. We found that the standard endpoints used in the OECD reproductive assays (e.g., egg production, number of spawning attempts, brood size) are more sensitive to Cd exposure than behavioural endpoints; however, the traditional method of interpreting reproductive impairment may underestimate toxic effects. Cadmium accumulation in liver and ovary of fish increased with increasing Cd exposure concentrations; however, plasma estradiol level remained unaffected. Reproductive capacity in fathead minnows decreased at waterborne Cd concentrations as low as 1 μg/L. The findings of our study have important implications for understanding the effects of chronic Cd exposure in metal-impacted feral fish populations.
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Affiliation(s)
- Yinxian Wang
- Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK S7N 5E2, Canada
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24
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Huang GY, Ying GG, Liang YQ, Liu SS, Liu YS. Expression patterns of metallothionein, cytochrome P450 1A and vitellogenin genes in western mosquitofish (Gambusia affinis) in response to heavy metals. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2014; 105:97-102. [PMID: 24793519 DOI: 10.1016/j.ecoenv.2014.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 04/03/2014] [Accepted: 04/09/2014] [Indexed: 05/21/2023]
Abstract
The aim of this study was to evaluate the effects of three metals (Zn, Cd and Pb) on hepatic metallothionein (MT), cytochrome P450 1A (CYP1A) and vitellogenin (Vtg) mRNA expression in the liver of adult female mosquitofish (Gambusia affinis) after 1, 3 or 8d. Both concentration-response and time-course effects of hepatic MT, CYP1A and Vtg at the transcription level were determined by quantitative real-time PCR. The results from this study showed that Zn, Cd and Pb could significantly induced MT, CYP1A and Vtg mRNA expression levels in mosquitofish. In general, this study demonstrated that heavy metals modulate MT, CYP1A and Vtg mRNA expression levels in a metal-, concentration- or time-dependent manner.
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Affiliation(s)
- Guo-Yong Huang
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
| | - Guang-Guo Ying
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
| | - Yan-Qiu Liang
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Shuang-Shuang Liu
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - You-Sheng Liu
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
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Wang B, Du Y. Cadmium and its neurotoxic effects. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2013; 2013:898034. [PMID: 23997854 PMCID: PMC3753751 DOI: 10.1155/2013/898034] [Citation(s) in RCA: 315] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 06/28/2013] [Accepted: 06/30/2013] [Indexed: 11/18/2022]
Abstract
Cadmium (Cd) is a heavy metal that has received considerable concern environmentally and occupationally. Cd has a long biological half-life mainly due to its low rate of excretion from the body. Thus, prolonged exposure to Cd will cause toxic effect due to its accumulation over time in a variety of tissues, including kidneys, liver, central nervous system (CNS), and peripheral neuronal systems. Cd can be uptaken from the nasal mucosa or olfactory pathways into the peripheral and central neurons; for the latter, Cd can increase the blood brain barrier (BBB) permeability. However, mechanisms underlying Cd neurotoxicity remain not completely understood. Effect of Cd neurotransmitter, oxidative damage, interaction with other metals such as cobalt and zinc, estrogen-like, effect and epigenetic modification may all be the underlying mechanisms. Here, we review the in vitro and in vivo evidence of neurotoxic effects of Cd. The available finding indicates the neurotoxic effects of Cd that was associated with both biochemical changes of the cell and functional changes of central nervous system, suggesting that neurotoxic effects may play a role in the systemic toxic effects of the exposure to Cd, particularly the long-term exposure.
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Affiliation(s)
- Bo Wang
- Department of Pathology, The Second Clinical Medical School of Inner Mongolia University for the Nationalities (Inner Mongolia Forestry General Hospital), Yakeshi 022150, Inner Mongolia, China
| | - Yanli Du
- Department of Neurosurgery, The Second Clinical Medical School of Inner Mongolia University for the Nationalities (Inner Mongolia Forestry General Hospital), Yakeshi 022150, Inner Mongolia, China
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Nair PMG, Park SY, Lee SW, Choi J. Differential expression of ribosomal protein gene, gonadotrophin releasing hormone gene and Balbiani ring protein gene in silver nanoparticles exposed Chironomus riparius. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 101:31-7. [PMID: 20870301 DOI: 10.1016/j.aquatox.2010.08.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 08/18/2010] [Accepted: 08/26/2010] [Indexed: 05/03/2023]
Abstract
The eco- and genotoxicity of silver nanoparticles (AgNPs) was investigated in the fourth instar larvae of the aquatic midge, Chironomus riparius. AgNPs did not have acute toxicity in C. riparius, but did exhibited chronic toxicity on development (pupation and emergence failure) and reproduction. Genotoxicity also occurred in AgNPs exposed C. riparius. Differential Display PCR (DD-PCR), based on the Annealing Control Primer (ACP) technique, was conducted to investigate the underlying toxic mechanism, which identified altered gene expression in C. riparius after treatment with AgNPs. The possible toxicity mechanism of AgNPs in C. riparius involves the down regulation of the ribosomal protein gene (CrL15) affecting the ribosomal assembly and consequently, protein synthesis. Up regulation of the gonadotrophin releasing hormone gene (CrGnRH1) might lead to the activation of gonadotrophin releasing hormone mediated signal transduction pathways and reproductive failure. Up regulation of the Balbiani ring protein gene (CrBR2.2) may be an indication of the organism's protection mechanism against the AgNPs. The overall results suggest that the toxicity of AgNPs towards aquatic organisms should be thoroughly investigated to allow for their safe use, as they seem to exhibit important toxicity towards C. riparius.
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Affiliation(s)
- Prakash M Gopalakrishnan Nair
- School of Environmental Engineering and Graduate School of Urban Sciences, University of Seoul, Seoul, Republic of Korea
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Gagnaire B, Adam-Guillermin C, Bouron A, Lestaevel P. The effects of radionuclides on animal behavior. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2011; 210:35-58. [PMID: 21170702 DOI: 10.1007/978-1-4419-7615-4_2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Concomitant with the expansion of the nuclear industry, the concentrations of several pollutants, radioactive or otherwise, including uranium, caesium, cadmium and cobalt, have increased over the last few decades. These elemental pollutants do exist in the environment and are a threat to many organisms. Behavior represents the integration of all the anatomical adaptations and physiological processes that occur within an organism. Compared to other biological endpoints, the effects of pollutants on animal behavior have been the focus of only a few studies. However, behavioral changes appear to be ideal for assessing the effects of pollutants on animal populations, because behavior links physiological functions with ecological processes. The alteration of behavioral responses can have severe implications for survival of individuals and of population of some species. Behavioral disruptions may derive from several underlying mechanisms: disruption of neuro-sensorial activity and of endocrines, or oxidative and metabolic disruptions. In this review, we presented an overview of the current literature in which the effects of radioactive pollutants on behavior in humans, rodents, fish and wildlife species are addressed. When possible, we have also indicated the potential underlying mechanisms of the behavioral alterations and parameters measured. In fried, chronic uranium contamination is associated with behavior alterations and mental disorders in humans, and cognitive deficits in rats. Comparative studies on depleted and enriched uranium effects in rats showed that chemical and radiological activities of this metal induced negative effects on several behavioral parameters and also produced brain oxidative stress. Uranium exposure also modifies feeding behavior of bivalves and reproductive behavior of fish. Studies of the effects of the Chernobyl accident shows that chronic irradiation to 137Cs induces both nervous system diseases and mental disorders in humans leading to increased suicides, as well as modification of preferred nesting sites, reduced hatching success and fecundity in birds that live in the Chernobyl zone. No significant effect from caesium exposure was shown in laboratory experiments with rats, but few studies were conducted. Data on radioactive cadmium are not available in the literature, but the effects of its metallic form have been well studied. Cadmium induces mental retardation and psychomotor alterations in exposed populations and increases anxiety in rats, leading to depression. Cadmium exposure also results in well-documented effects on feeding and burrowing behavior in several invertebrate species (crustaceans, gastropods, annelids, bivalves) and on different kinds of fish behavior (swimming activity, fast-start response, antipredatory behavior). Cobalt induces memory deficits in humans and may be involved in Alzheimer's disease; gamma irradiation by cobalt also decreases fecundity and alters mating behavior in insects. Collectively, data are lacking or are meagre on radionuclide pollutants, and a better knowledge of their actions on the cellular and molecular mechanisms that control animal behavior is needed.
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Affiliation(s)
- Beatrice Gagnaire
- Laboratoire de Radioécologie et d'Ecotoxicologie, IRSN, Centre de Cadarache, Bat 186, 13115, Saint-Paul-Lez-Durance Cedex, France.
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Le Page Y, Vosges M, Servili A, Brion F, Kah O. Neuroendocrine effects of endocrine disruptors in teleost fish. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2011; 14:370-86. [PMID: 21790317 DOI: 10.1080/10937404.2011.578558] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Because a large proportion of potential endocrine disruptors (EDC) end up in surface waters, aquatic species are particularly vulnerable to their potential adverse effects. Recent studies identified a number of brain targets for EDC commonly present in environmentally relevant concentrations in surface waters. Among those neuronal systems disrupted by EDC are the gonadotropin-releasing hormone (GnRH) neurons, the dopaminergic and serotoninergic circuits, and more recently the Kiss/GPR54 system, which regulates gonadotropin release. However, one of the most striking effects of EDC, notably estrogen mimics, is their impact on the cyp19a1b gene that encodes the brain aromatase isoform in fish. Moreover, this is the only example in which the molecular basis of endocrine disruption is fully understood. The aims of this review were to (1) synthesize the most recent discoveries concerning the EDC effects upon neuroendocrine systems of fish and (2) provide, when possible, the underlying molecular basis of disruption for each system concerned. The potential adverse effects of EDC on neurogenesis, puberty, and brain sexualization are also described. It is important to point out the future environmental, social, and economical issues arising from endocrine disruption studies in the context of risk assessment.
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Affiliation(s)
- Yann Le Page
- Neurogenesis and Estrogens, UMR CNRS 6026, Rennes, France.
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Ali I, Penttinen-Damdimopoulou PE, Mäkelä SI, Berglund M, Stenius U, Åkesson A, Håkansson H, Halldin K. Estrogen-like effects of cadmium in vivo do not appear to be mediated via the classical estrogen receptor transcriptional pathway. ENVIRONMENTAL HEALTH PERSPECTIVES 2010; 118:1389-94. [PMID: 20525538 PMCID: PMC2957917 DOI: 10.1289/ehp.1001967] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Accepted: 06/04/2010] [Indexed: 05/25/2023]
Abstract
BACKGROUND Cadmium (Cd), a ubiquitous food contaminant, has been proposed to be an endocrine disruptor by inducing estrogenic responses in vivo. Several in vitro studies suggested that these effects are mediated via estrogen receptors (ERs). OBJECTIVE We performed this study to clarify whether Cd-induced effects in vivo are mediated via classical ER signaling through estrogen responsive element (ERE)-regulated genes or if other signaling pathways are involved. METHODS We investigated the estrogenic effects of cadmium chloride (CdCl2) exposure in vivo by applying the Organisation for Economic Co-operation and Development (OECD) rodent uterotrophic bioassay to transgenic ERE-luciferase reporter mice. Immature female mice were injected subcutaneously with CdCl2 (5, 50, or 500 µg/kg body weight) or with 17α-ethinylestradiol (EE2) on 3 consecutive days. We examined uterine weight and histology, vaginal opening, body and organ weights, Cd tissue retention, activation of mitogen-activated protein kinase (MAPK) pathways, and ERE-dependent luciferase expression. RESULTS CdCl2 increased the height of the uterine luminal epithelium in a dose-dependent manner without increasing the uterine wet weight, altering the timing of vaginal opening, or affecting the luciferase activity in reproductive or nonreproductive organs. However, we observed changes in the phosphorylation of mouse double minute 2 oncoprotein (Mdm2) and extracellular signal-regulated kinase (Erk1/2) in the liver after CdCl2 exposure. As we expected, EE2 advanced vaginal opening and increased uterine epithelial height, uterine wet weight, and luciferase activity in various tissues. CONCLUSION Our data suggest that Cd exposure induces a limited spectrum of estrogenic responses in vivo and that, in certain targets, effects of Cd might not be mediated via classical ER signaling through ERE-regulated genes.
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Affiliation(s)
- Imran Ali
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | | | - Sari I. Mäkelä
- Functional Foods Forum and Institute of Biomedicine, University of Turku, Turku, Finland
| | - Marika Berglund
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Ulla Stenius
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Agneta Åkesson
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Helen Håkansson
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Krister Halldin
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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Dangre AJ, Manning S, Brouwer M. Effects of cadmium on hypoxia-induced expression of hemoglobin and erythropoietin in larval sheepshead minnow, Cyprinodon variegatus. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2010; 99:168-175. [PMID: 20447699 DOI: 10.1016/j.aquatox.2010.04.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Revised: 04/12/2010] [Accepted: 04/17/2010] [Indexed: 05/29/2023]
Abstract
Hypoxia and toxic metals are two common stressors found in the estuarine environment. To date little information is available on the combined effects of these stressors on early larval development in fish. We investigated the effect of cadmium and hypoxia exposure alone as well in combination on larval Cyprinodon variegatus. The LC(10) for cadmium was determined to be 0.3 ppm in a 96 h acute exposure. This concentration was used in all studies. Cadmium in larvae increased significantly with exposure time (1, 3, 5 and 7 days post-hatch). The increase was proportional to body weight and not affected by hypoxia. Cadmium responsive genes were identified by suppression subtractive hybridization (SSH) in Cyprinodon variegatus larvae after exposure to cadmium for 1, 3, 5 and 7 days. We obtained over 700 sequences from the cadmium cDNA library. Blast search of ESTs suggested that cadmium modulates multiple physiological processes. Pertinent to this study, cadmium was found to down-regulate both embryonic alpha and beta globin, which are expressed in erythrocytes generated during the first, or primitive, wave of erythropoiesis in teleosts. Hemoglobin (Hb) and erythropoietin (Epo) (the hormone that promotes red blood cell production) are known hypoxia-inducible genes. To explore the possibility that cadmium might offset the hypoxia-induced expression of Hb and Epo, we investigated the expression of both genes following hypoxia, cadmium and combined exposures for 1, 3, 5 and 7 days post-hatch. Since Epo had not yet been identified in C. variegatus we first successfully cloned a partial coding sequence of the C. variegatus hormone. Subsequent studies revealed that expression levels of Hb and Epo remained unchanged in the normoxic controls during the time course of the study. Hypoxia increased Epo expression relative to normoxic controls, on days 3, 5 and 7, while cadmium in hypoxia inhibited the increase. Only the changes on days 5 and 7 were statistically significant. Hypoxia also lead to a modest, but significant induction of Hb after 5 days. However, in spite of the Cd-induced down-regulation of Epo on day 5, Cd did not affect the hypoxia-induced expression of embryonic Hb at this time point. It appears therefore that Epo has only limited effect on primitive erythropoiesis in C. variegatus.
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Affiliation(s)
- A J Dangre
- Department of Coastal Sciences, The University of Southern Mississippi, 703 East Beach Drive, Ocean Springs, MS 39564, USA
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Huang CC, Xu Y, Briggler JT, McKee M, Nam P, Huang YW. Heavy metals, hematology, plasma chemistry, and parasites in adult hellbenders (Cryptobranchus alleganiensis). ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2010; 29:1132-1137. [PMID: 20821549 DOI: 10.1002/etc.148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Ozark (Cryptobranchus alleganiensis bishopi) and eastern hellbenders (C. a. alleganiensis) from seven rivers in Missouri, USA, were collected to investigate essential information on hematology, parasites, and plasma chemistry and levels of select heavy metals (Hg, Pb, Cd, Cr, and Co) in the animals' blood. The body masses of Ozark hellbenders were much smaller than those of eastern hellbenders. Blood parasites were detected in Ozark hellbenders, but not eastern hellbenders. The higher frequency in occurrence of eosinophils in Ozark hellbenders (8.8-16.8%) than in eastern hellbenders (highest at 6.6%) might result from the infection of parasites. Seven of the 18 hematology and plasma parameters (hematocrit, basophils, eosinophils, K, P, Ca, and chloride) showed significant differences between subspecies. The blood levels of heavy metals Co, Hg, and Pb differed significantly between subspecies. Ozark hellbenders had higher blood levels of Co (p<0.001), while blood levels of Hg and Pb were higher in eastern hellbenders. The levels of chromium (Cr) and cadmium (Cd) were not different between subspecies and among rivers. The eastern hellbenders at Niangua River and the Ozark hellbenders at the North Fork of the White River had lower Hg levels compared to eastern and Ozark hellbenders at other sites. All together, our findings provide important baseline information for managing this endangered species.
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Affiliation(s)
- Chuan-Chin Huang
- Department of Biological Sciences, Missouri University of Science and Technology, 105 Schrenk Hall, Rolla, Missouri 65409, USA
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Piña B, Boronat S, Casado M, Olivares A. Recombinant Yeast Assays and Gene Expression Assays for the Analysis of Endocrine Disruption. THE HANDBOOK OF ENVIRONMENTAL CHEMISTRY 2009. [DOI: 10.1007/978-3-540-36253-1_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Sharma B, Patiño R. Exposure of Xenopus laevis Tadpoles to Cadmium Reveals Concentration-dependent Bimodal Effects on Growth and Monotonic Effects on Development and Thyroid Gland Activity. Toxicol Sci 2008; 105:51-8. [DOI: 10.1093/toxsci/kfn119] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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McClusky LM. Cadmium accumulation and binding characteristics in intact Sertoli/germ cell units, and associated effects on stage-specific functionsin vitro: insights from a shark testis model. J Appl Toxicol 2008; 28:112-21. [PMID: 17557368 DOI: 10.1002/jat.1253] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The increased human use of cadmium (Cd) and its increased occurrence in the environment is of concern. The testis is sensitive to Cd because of the steroid-mediated regulation of spermatogenesis, high levels of DNA synthesis and gene transcription, all of which varies in a stage-related manner. Validated techniques (acridine orange vital staining to detect apoptosis and dextran-rhodamine exclusion to assess blood-testis barrier function) were recently developed and the shark testis was proposed as an alternative model for assessing stage-specific functions in living testicular tissue and to study toxicant actions on spermatogenesis. The present paper shows that 109Cd accumulation and binding in vitro was stage-dependent (premeiotic, PrM > meiotic, M > postmeiotic, PoM), rapid and persisted in spermatocysts (intact germ cell/Sertoli cell units) 49 h after washout. In competitive binding analyses of all three spermatocyst stages, Hg, but not Zn, could replace bound 109Cd, suggesting that Cd binding was specific. These findings were associated with a biphasic apoptotic response in the PrM spermatocysts, which was maximal at 10 microm CdCl2 and 1 microm CdCl2 after 2 and 4 days in culture, respectively. Although Cd uptake in PoM cysts was more than 2-fold less than uptake in PrM cysts, the percentage dextran-rhodamine permeant PoM cysts was approximately 8-fold greater than in controls in the presence of both 10 microm CdCl2 and 30 microm CdCl2 after 4 days culture, indicating that blood-testis barrier function in PoM spermatocysts was compromised. These findings demonstrate that this model has utility for use in screening assays of environmental toxicants.
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Affiliation(s)
- Leon M McClusky
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, P.O. Box 2034, Pretoria, South Africa.
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Cadmium Disrupts the Diethylstilbestrol Effect on Very-Low-Density Apolipoprotein II Gene Transcription in the Liver of Japanese Quail (Coturnix japonica). J Poult Sci 2008. [DOI: 10.2141/jpsa.45.62] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Gagnon E, Hontela A, Jumarie C. Reciprocal inhibition of Cd and Ca uptake in isolated head kidney cells of rainbow trout (Oncorhynchus mykiss). Toxicol In Vitro 2007; 21:1077-86. [PMID: 17540537 DOI: 10.1016/j.tiv.2007.03.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2006] [Revised: 02/22/2007] [Accepted: 03/28/2007] [Indexed: 10/23/2022]
Abstract
Some environmental pollutants, including cadmium (Cd) and zinc (Zn), can act as endocrine disruptors in fish, either in vivo or through a direct action on steroidogenic cells, as has been demonstrated in vitro. We have previously characterized Cd uptake in head kidney (homologue of mammalian adrenal) cells of rainbow trout (Oncorhynchus mykiss) and have provided evidence for a Cd/Ca interaction. Here, we pursued our investigation of metal competition for uptake. Our results show that inorganic speciation conditions favour Cd uptake with optimal level of accumulation for Cd2+ compared to chlorocomplexes (CdCl(n)(2-n)). Calcium uptake was studied for the first time in the fish head kidney cells and Ca was found to be less efficiently accumulated compared to Cd. A specific saturable mechanism of transport was characterized for Ca uptake but voltage-gated or La-sensitive cationic channels are unlikely to contribute appreciably. A concentration-dependent reciprocal inhibition was observed between Ca and Cd, whereas, Zn proved to inhibit Cd uptake exclusively. Additive inhibitory effect on Cd uptake was obtained with co-exposure to Ca and Zn. We conclude that Cd, but not Zn, may decrease Ca availability to the head kidney tissue. Also, Zn may partially protect against Cd toxicity but Zn would not protect against Cd-induced perturbation of Ca homeostasis.
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Affiliation(s)
- E Gagnon
- Département des sciences biologiques, centre TOXEN, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec, Canada H3C 3P8
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Wang N, Mackenzie L, De Souza AG, Zhong H, Goss G, Li L. Proteome profile of cytosolic component of zebrafish liver generated by LC-ESI MS/MS combined with trypsin digestion and microwave-assisted acid hydrolysis. J Proteome Res 2007; 6:263-72. [PMID: 17203970 DOI: 10.1021/pr060367o] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The zebrafish genome has recently been sequenced and annotated allowing for high-throughput proteomic analysis. Here, we report for the first time a proteomic subset of zebrafish liver, an important organ for metabolizing toxins. Using a newly developed analytical procedure, we have identified 1204 proteins from the cytosolic component of a zebrafish liver tissue sample. Our methods involve cell-compartment fractionation of liver tissue samples, four levels of protein digestion, and off-line two-dimensional liquid chromatography (2-D LC) separations of resultant peptides. Proteins are identified using an electrospray ionization quadrupole time-of-flight tandem mass spectrometer (ESI-QTOF MS/MS), which provides high-resolution and high-accuracy mass measurement of peptide ions and their fragment ions. We demonstrate that greater proteome coverage can be achieved by combining the results obtained from four methods of protein digestion: three tryptic digests (one in buffer, one in methanol, and another in SDS), and a microwave-assisted acid hydrolysate of the protein extracts. Identified proteins--which included several groups of established protein biomarkers--were functionally classified. We discuss the functions and implications of these biomarkers within the context of zebrafish toxicology.
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Affiliation(s)
- Nan Wang
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
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Sellin MK, Kolok AS. Cd exposures in fathead minnows: effects on adult spawning success and reproductive physiology. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2006; 51:594-9. [PMID: 17009127 PMCID: PMC2689789 DOI: 10.1007/s00244-006-0026-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2006] [Accepted: 04/16/2006] [Indexed: 05/02/2023]
Abstract
The primary objective of this study was to determine whether cadmium (Cd) exposures alter reproduction in fathead minnows (Pimephales promelas). Pairs of sexually mature minnows were exposed to waterborne Cd at 0, 12.5, 25, or 50 microg/L for 21 days. During this exposure period, the reproductive success of pairs was assessed. Following the exposure, gonadosomatic index (GSI), male secondary sexual characteristics, male plasma 11-ketotestosterone (11-KT) concentrations, and female plasma estradiol (E2) concentrations were determined. Results of this study show that Cd exposures impair reproduction in fathead minnows. Pairs exposed to 50 microg/L experienced a significant decline in spawning frequency and fecundity relative to unexposed minnows. Cd exposures also caused alterations in male secondary sexual characteristics, as males exposed to 25 microg/L had significantly fewer nuptial tubercles than controls. Furthermore, males exposed to 12.5 microg/L Cd experienced a significant increase in plasma 11-KT concentrations relative to controls. No alterations in GSI or female plasma E2 concentrations were observed.
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Affiliation(s)
- Marlo K Sellin
- Department of Biology, University of Nebraska at Omaha, 6001 Dodge Street, Omaha, Nebraska 68182-0040, USA.
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Williams TD, Diab AM, George SG, Godfrey RE, Sabine V, Conesa A, Minchin SD, Watts PC, Chipman JK. Development of the GENIPOL European flounder (Platichthys flesus) microarray and determination of temporal transcriptional responses to cadmium at low dose. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2006; 40:6479-88. [PMID: 17120584 DOI: 10.1021/es061142h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We have constructed a high density, 13 270-clone cDNA array for the sentinel fish species European flounder (Platichthys flesus), combining clones from suppressive subtractive hybridization and a liver cDNA library; DNA sequences of 5211 clones were determined. Fish were treated by single intraperitoneal injection with 50 micrograms cadmium chloride per kilogram body weight, a dose relevant to environmental exposures, and hepatic gene expression changes were determined at 1, 2, 4, 8, and 16 days postinjection in comparison to saline-treated controls. Gene expression responses were confirmed by real-time reverse transcription polymerase chain reaction (RT-PCR). Blast2GO gene ontology analysis highlighted a general induction of the unfolded protein response, response to oxidative stress, protein synthesis, transport, and degradation pathways, while apoptosis, cell cycle, cytoskeleton, and cytokine genes were also affected. Transcript levels of cytochrome P450 1A (CYP1A) were repressed and vitellogenin altered, real-time PCR showed induction of metallothionein. We thus describe the establishment of a useful resource for ecotoxicogenomics and the determination of the temporal molecular responses to cadmium, a prototypical heavy metal pollutant.
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Affiliation(s)
- Tim D Williams
- School of Biosciences, The University of Birmingham, Edgbaston, Birmingham, B15 2TT UK.
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Klaper R, Rees CB, Drevnick P, Weber D, Sandheinrich M, Carvan MJ. Gene expression changes related to endocrine function and decline in reproduction in fathead minnow (Pimephales promelas) after dietary methylmercury exposure. ENVIRONMENTAL HEALTH PERSPECTIVES 2006; 114:1337-43. [PMID: 16966085 PMCID: PMC1570078 DOI: 10.1289/ehp.8786] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
BACKGROUND Methylmercury (MeHg) is a known neurotoxic agent, but the mechanisms by which MeHg may act on reproductive pathways are relatively unknown. Several studies have indicated potential changes in hormone levels as well as declines in vertebrates with increasing dietary MeHg exposure. OBJECTIVES The purpose of this study was to identify alterations in gene expression associated with MeHg exposure, specifically those associated with previously observed changes in reproduction and reproductive biomarkers. Fathead minnows, Pimephales promelas, were fed one of three diets that were similar to documented concentrations of MeHg in the diets of wild invertivorous and piscivorous fish. We used a commercial macroarray in conjunction with quantitative polymerase chain reaction to examine gene expression in fish in relation to exposure to these environmentally relevant doses of MeHg. RESULTS Expression of genes commonly associated with endocrine disruption was altered with Hg exposure. Specifically, we observed a marked up-regulation in vitellogenin mRNA in individual Hg-exposed males and a significant decline in vitellogenin gene expression in female fish with increasing Hg concentrations. Other genes identified by the macroarray experiment included those associated with egg fertilization and development, sugar metabolism, apoptosis, and electron transport. We also observed differences in expression patterns between male and female fish not related to genes specifically associated with reproduction, indicating a potential physiological difference in the reaction of males and females to MeHg. CONCLUSION Gene expression data may provide insight into the mechanisms by which MeHg affects reproduction in fish and indicate how MeHg differs in its effect from other heavy metals and endocrine-disrupting compounds.
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Affiliation(s)
- Rebecca Klaper
- Great Lakes WATER Institute, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA.
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Darbre PD. Metalloestrogens: an emerging class of inorganic xenoestrogens with potential to add to the oestrogenic burden of the human breast. J Appl Toxicol 2006; 26:191-7. [PMID: 16489580 DOI: 10.1002/jat.1135] [Citation(s) in RCA: 180] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Many compounds in the environment have been shown capable of binding to cellular oestrogen receptors and then mimicking the actions of physiological oestrogens. The widespread origin and diversity in chemical structure of these environmental oestrogens is extensive but to date such compounds have been organic and in particular phenolic or carbon ring structures of varying structural complexity. Recent reports of the ability of certain metal ions to also bind to oestrogen receptors and to give rise to oestrogen agonist responses in vitro and in vivo has resulted in the realisation that environmental oestrogens can also be inorganic and such xenoestrogens have been termed metalloestrogens. This report highlights studies which show metalloestrogens to include aluminium, antimony, arsenite, barium, cadmium, chromium (Cr(II)), cobalt, copper, lead, mercury, nickel, selenite, tin and vanadate. The potential for these metal ions to add to the burden of aberrant oestrogen signalling within the human breast is discussed.
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Affiliation(s)
- P D Darbre
- School of Biological Sciences, The University of Reading, UK.
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Vetillard A, Ferriere F, Jego P, Bailhache T. Regulation of salmon gonadotrophin-releasing hormone gene expression by sex steroids in rainbow trout brain. J Neuroendocrinol 2006; 18:445-53. [PMID: 16684134 DOI: 10.1111/j.1365-2826.2006.01432.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Salmon gonadotrophin-releasing hormone (sGnRH) is the major form of gonadotrophin-releasing hormone in the brain of Salmonids and is encoded by two different genes: sGnRH1 and sGnRH2. In the present study, we examined the expression patterns of these two genes during development and throughout the reproductive cycle of the female rainbow trout (Oncorhynchus mykiss), and also investigated the feedback action of sex steroids on brain mRNA levels. Both genes are expressed as early as 14 days postfertilisation and show a similar expression pattern during early life stages. In the adult female, sGnRH1 and sGnRH2 mRNAs are both present in neurones located in the ventral forebrain. This gene expression in the brain appears to be low during early vitellogenesis, and increases during oocyte maturation to reach a maximum after ovulation. The expression of sGnRH1 was not modified by in vivo steroid treatments in any experiment; however, testosterone and 5alpha-dihydrotestosterone down-regulate brain sGnRH2 gene in immature and adult ovariectomised females. Oestradiol treatment decreases sGnRH2 mRNA levels in the brain of adult ovariectomised females only. In the triploid fish brain, none of the steroids affect brain sGnRH mRNA levels. Our results suggest that, unlike sGnRH1, the sGnRH2 gene is under a strongly androgenic inhibitory control in the immature and adult female rainbow trout.
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Affiliation(s)
- A Vetillard
- MRC Toxicology Unit, Hodgkin Building, University of Leicester, Leicester, UK.
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Vetillard A, Bailhache T. Effects of 4-n-Nonylphenol and Tamoxifen on Salmon Gonadotropin-Releasing Hormone, Estrogen Receptor, and Vitellogenin Gene Expression in Juvenile Rainbow Trout. Toxicol Sci 2006; 92:537-44. [PMID: 16705041 DOI: 10.1093/toxsci/kfl015] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Alkylphenols such as nonylphenol (NP) are one of a wide variety of environmental chemicals reported to have estrogenic effects in both in vitro and in vivo studies. Induction of hepatic vitellogenin (Vg) gene expression is widely used as a biomarker for xenoestrogen exposure in fish. However, little work has been done to characterize the molecular effects of xenoestrogens on other potential target organs such as the brain. To evaluate brain and liver effects of 4-n-nonylphenol (4-NP), juvenile rainbow trout (Oncorhynchus mykiss) were exposed to waterborne 4-NP or 17beta-estradiol (E(2)). Changes in mRNA levels of salmon gonadotropin-releasing hormone (sGnRH) and estrogen receptor alpha (ERalpha) isoforms in the brain and ERalpha isoforms and Vg in the liver were measured after 3 and 6 days of exposure, with the help of a relative RT-PCR-based quantification method. Fish were treated with increasing doses of 4-NP ranging from 0.01 to 10 microM (2.2 microg/l to 2.2 mg/l), and results were compared to the effect of E(2) or tamoxifen, a specific ER modulator. In liver, E(2) and the highest doses of 4-NP increased Vg and ERalpha long-isoform mRNA levels within 3 or 6 days of exposure, but 4-NP did not have any effect on ERalpha short-isoform transcription level. In the brain, 4-NP reduced sGnRH2 gene expression in a dose-dependent manner, but did not modify sGnRH1 or ERalpha mRNA levels.
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Affiliation(s)
- Angelique Vetillard
- MRC Toxicology Unit, University of Leicester, Leicester LE1 9HN, United Kingdom.
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McClusky LM. Stage-dependency of apoptosis and the blood-testis barrier in the dogfish shark (Squalus acanthias): cadmium-induced changes as assessed by vital fluorescence techniques. Cell Tissue Res 2006; 325:541-53. [PMID: 16596392 DOI: 10.1007/s00441-006-0184-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2005] [Accepted: 02/01/2006] [Indexed: 11/25/2022]
Abstract
Naturally occurring heavy metals and synthetic compounds are potentially harmful for testicular function but evidence linking heavy metal exposure to reduced semen parameters is inconclusive. Elucidation of the exact stage at which the toxicant interferes with spermatogenesis is difficult because the various germ cell stages may have different sensitivities to any given toxicant, germ cell development is influenced by supporting testicular somatic cells and the presence of inter-Sertoli cell tight junctions create a blood-testis barrier, sequestering meiotic and postmeiotic germ cells in a special microenvironment. Sharks such as Squalus acanthias provide a suitable model for studying aspects of vertebrate spermatogenosis because of their unique features: spermatogenesis takes place within spermatocysts and relies mainly on Sertoli cells for somatic cell support; spermatocysts are linearly arranged in a maturational order across the diameter of the elongated testis; spermatocysts containing germ cells at different stages of development are topographically separated, resulting in visible zonation in testicular cross sections. We have used the vital dye acridine orange and a novel fluorescence staining technique to study this model to determine (1) the efficacy of these methods in assays of apoptosis and blood-testis barrier function, (2) the sensitivity of the various spermatogonial generations in Squalus to cadmium (as an illustrative spermatotoxicant) and (3) the way that cadmium might affect more mature spermatogenic stages and other physiological processes in the testis. Our results show that cadmium targets early spermatogenic stages, where it specifically activates a cell death program in susceptible (mature) spermatogonial clones, and negatively affects blood-testis barrier function. Since other parameters are relatively unaffected by cadmium, the effects of this toxicant on apoptosis are presumably process-specific and not attributable to general toxicity.
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Affiliation(s)
- Leon M McClusky
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, P.O. Box 2034 Pretoria, South Africa.
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Mandon CA, Diaz-Latoud C, Arrigo AP, Blum LJ. Dithiocarbamate fungicide thiram detection: comparison of bioluminescent and fluorescent whole-cell bioassays based on hsp22 stress promoter induction. J Biotechnol 2006; 124:392-402. [PMID: 16492392 DOI: 10.1016/j.jbiotec.2006.01.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2005] [Revised: 12/16/2005] [Accepted: 01/04/2006] [Indexed: 10/25/2022]
Abstract
Detection of toxic substances interfering with endocrine system is one of the major preoccupations of the European community. A whole-cell bioassay for pollution detection based on stress induction has been designed. Well characterized toxicants, cadmium chloride and thiram (a dithiocarbamate fungicide), were used to optimize the detection conditions such as time-course conditions, cell line and reporter gene to be used. HeLa cells containing the firefly luciferase (luc) reporter gene under the control of the Drosophila melanogaster hsp22 promoter were compared to liver cells (HepG2) containing the same stress gene promoter fused either to the luc or the EGFP (Enhanced-Green Fluorescent Protein) gene. The sensitivity of the obtained bioassay was found to be enhanced by the concomitant use of liver cells and EGFP reporter gene. The detection limits of the toxicants were then lowered from 1 to 0.1 microM and from 1 to 0.01 microM for CdCl(2) and thiram, respectively.
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Affiliation(s)
- C A Mandon
- Laboratoire de Génie Enzymatique et Biomoléculaire, UMR 5013 CNRS, Université Claude Bernard Lyon 1, Villeurbanne, France.
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Nesatyy VJ, Ammann AA, Rutishauser BV, Suter MJF. Effect of cadmium on the interaction of 17beta-estradiol with the rainbow trout estrogen receptor. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2006; 40:1358-63. [PMID: 16572797 DOI: 10.1021/es051346i] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The widely reported negative effects of xenoestrogens on the endocrine system of aquatic organisms gave raise to public concern and led to a number of screening and testing initiatives on the international level. Recent studies indicated that not only organic chemicals but also certain heavy metals, including cadmium, can mimic the effects of the endogenous estrogen receptor agonist 17beta-estradiol (E2) and lead to estrogen receptor activation. While the effects of cadmium on the endocrine system and its potential to harm living organisms are no longer in doubt, the exact mode of action is still essentially unknown. In the present study we utilized the rainbow trout ER alpha ligand binding domain (rtER-LBD) fused to glutathione-S-transferase, to study noncovalent interactions between cadmium and the rtER-LBD. ICP-MS data showed that the Cd uptake by the rtER-LBD was strongly pH-dependent. Previous results showing that Cd shields Cys residues of the rtER-LBD against chemical modification, and competitive binding experiments reported here provide insights into the specificity of the interaction of cadmium with the ER hormone binding cavity. It could, for instance, be shown that most of the cadmium adsorbed to the protein could be released into solution either under denaturing conditions, or by stripping from the protein surface using EDTA at physiological conditions. Competitive binding experiments using radio-labeled estradiol showed that, in contrast to previously published data, E2 has an affinity an order of magnitude higher for the ER than for Cd. ICP-MS experiments showed that, despite its higher affinity, increasing E2 concentrations were unable to replace Cd from the rtER-LBD that had been preequilibrated with Cd. These findings were independently confirmed by the [3H]-E2 binding assay. At the same time both ICP-MS and the [3H]-E2 binding assay showed that increasing Cd concentrations not only lead to a decrease in the specific estradiol binding, but also to the release of E2 from the preequilibrated rtER-LBD. The gradual release of [3H]-E2 from the rtER-LBD following incubation with increasing Cd concentrations indicates either direct competition for the same binding site or Cd-induced conformational changes resulting in the release of estradiol.
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Affiliation(s)
- Victor J Nesatyy
- Department of Environmental Toxicology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), CH-8600 Duebendorf Switzerland
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