Phenotypically-anchored transcriptome profiling of developmental exposure to the antimicrobial agent, triclosan, reveals hepatotoxicity in embryonic zebrafish
Ontology highlight
ABSTRACT:
ORGANISM(S): Danio rerio
PROVIDER: GSE80955 | GEO | 2016/10/31
SECONDARY ACCESSION(S): PRJNA320110
REPOSITORIES: GEO
Similar Datasets
Project description:Triclosan (TCS) is an antimicrobial agent commonly found in a variety of personal care products and cosmetics. TCS readily enters the environment through wastewater and is detected in human plasma, urine, and breast milk due to its widespread use. Studies have implicated TCS as a disruptor of thyroid and estrogen signaling; therefore, research examining the developmental effects of TCS is warranted. In this study, we used embryonic zebrafish to investigate the developmental toxicity and potential mechanism of action of TCS. Embryos were exposed to graded concentrations of TCS from 6 to 120hours post-fertilization (hpf) and the concentration where 80% of the animals had mortality or morbidity at 120hpf (EC80) was calculated. Transcriptomic profiling was conducted on embryos exposed to the EC80 (7.37?M). We identified a total of 922 significant differentially expressed transcripts (FDR adjusted P-value?0.05; fold change ?2). Pathway and gene ontology enrichment analyses identified biological networks and transcriptional hubs involving normal liver functioning, suggesting TCS may be hepatotoxic in zebrafish. Tissue-specific gene enrichment analysis further supported the role of the liver as a target organ for TCS toxicity. We also examined the in vitro bioactivity profile of TCS reported by the ToxCast screening program. TCS had a diverse bioactivity profile and was a hit in 217 of the 385 assay endpoints we identified. We observed similarities in gene expression and hepatic steatosis assays; however, hit data for TCS were more concordant with the hypothesized CAR/PXR activity of TCS from rodent and human in vitro studies.
| S-EPMC5023494 | biostudies-literature
Project description:Triclosan is a commonly used antibacterial and antifungal agent. However, safety of TCS has been disputed. We performed gene expression profiling of TCS and estrogen-administrered rat uterus to compare genes and cellular processes to find the effects of TCS and estrogen.
2017-08-13 | GSE89321 | GEO
Project description:Triclosan (TCS), an antimicrobial agent in thousands of consumer products, is a risk factor for colitis and colitis-associated colorectal cancer. While the intestinal toxicities of TCS require the presence of gut microbiota, the molecular mechanisms involved have not been defined. Here we show that intestinal commensal microbes mediate metabolic activation of TCS in the colon and drive its gut toxicology. Using a range of in vitro, ex vivo, and in vivo approaches, we identify specific microbial β-glucuronidase (GUS) enzymes involved and pinpoint molecular motifs required to metabolically activate TCS in the gut. Finally, we show that targeted inhibition of bacterial GUS enzymes abolishes the colitis-promoting effects of TCS, supporting the essential roles of specific microbial proteins in TCS toxicity. Our results define a mechanism by which intestinal microbes cause the gut toxicity of environmental chemicals and suggest a therapeutic approach to alleviate colitis and associated diseases.
2021-11-04 | PXD025887 | Pride
Project description:Aiming at the development of a micropollutant biosensor in the frame of the Micro-Ecological Life Support System Alternative (MELiSSA), a pilot study was initiated to identify triclosan (TCS)-responsive biomarker genes in the MELiSSA carbon-mineralizing microorganism, Rhodospirillum rubrum S1H. TCS is a biocide, commonly found in human excrements and is considered an emerging pollutant in wastewater and the environment. Chronic exposure to MELiSSA-relevant concentrations (≥25 µg L-1) TCS caused a significant extension of the lag phase without affecting the growth rate. Analytical determination gave no indication of TCS biodegradation during the growth experiment and flow cytometric viability analyses revealed that TCS is only slightly toxic to R. rubrum. Through microarray analyses, the genetic mechanisms supporting the reversibility of TCS-induced inhibition were scrutinized. Hence, an extremely TCS-responsive cluster of four small adjacent genes was revealed, with up to 34-fold induction at 25 µg L-1. These four genes, for which the name micropollutant-upregulated factor (muf) was proposed; appear to be unique to R. rubrum and are shown for the first time to be involved in the response to stress. Moreover, numerous other systems that are associated with the proton-motive force were shown to be responsive to TCS, but never as highly upregulated as the muf genes. Hence, R. rubrum induced the phage shock protein operon (pspABC), numerous major facilitator efflux systems, cell envelope consolidation mechanisms, oxidative stress response, beta-oxidation, and carbonic anhydrase; while downregulating bacterial conjugation- and carboxysome synthesis genes. The muf genes and three efflux-related genes showed most potential as low-dose biomarkers. The two microarray experiments (10 and 25 µg l-1 Triclosan) were all performed in biological triplicate and containing three (in-slide) technical repeats. For all conditions, the Triclosan exposed sample (Cy5) was compared with the non-exposed solvent control (Cy3) to identify those genes that were differentially expressed upon Triclosan exposure.
2010-05-19 | E-GEOD-16189 | biostudies-arrayexpress
Project description:Triclosan (TCS), an antibacterial compound commonly added to personal care products, could be an endocrine disruptor at low doses. Although TCS has been shown to alter fetal physiology, its effects in the developing fetal brain are unknown. The objective of this study was to use transcriptomics and systems analysis to determine significantly altered biological processes in the late gestation ovine fetal hypothalamus after direct or indirect exposure to low doses of TCS. We found that short-term infusion of TCS induces vigorous changes in the fetal hypothalamic transcriptomics, which are mainly related to food intake pathways and metabolism. For direct TCS exposure, chronically catheterized late gestation fetal sheep were infused with vehicle (n=4) or TCS (250 μg/day; n=4) iv. For indirect TCS exposure, TCS (100 μg/kg/day; n=3) or vehicle (n=3) was infused into the maternal circulation. Fetal hypothalami were collected after 2 days of infusion, and gene expression was measured using Agilent 15k ovine microarrays.
2016-02-29 | E-GEOD-69275 | biostudies-arrayexpress
Project description:Triclosan (TCS), an antibacterial compound commonly added to personal care products, could be an endocrine disruptor at low doses. Although TCS has been shown to alter fetal physiology, its effects in the developing fetal brain are unknown. The objective of this study was to use transcriptomics and systems analysis to determine significantly altered biological processes in the late gestation ovine fetal hypothalamus after direct or indirect exposure to low doses of TCS. We found that short-term infusion of TCS induces vigorous changes in the fetal hypothalamic transcriptomics, which are mainly related to food intake pathways and metabolism.
2016-02-29 | GSE69275 | GEO
Project description:In this study, the effects of Triclosan (TCS) and its alternatives, including Benzalkonium chloride (BAM), Benzethonium chloride (BEC), Chloroxylenol (CEO), Chlorhexidine (CHX) and Cetylpyridinium chloride (CPC), were investigated in THP-1 macrophages. For this purpose, untargeted proteomics was applied.
2024-02-05 | PXD044828 | Pride
Project description:Triclosan (TCS) is an antimicrobial toxicant found in a myriad of consumer products and has been detected in human tissues, including breastmilk. We have evaluated the impact of lactational TCS on UDP-glucuronosyltransferase 1A1 (UGT1A1) expression and bilirubin metabolism in humanized UGT1 (hUGT1) neonatal mice. In hUGT1 mice, expression of the hepatic UGT1A1 gene is developmentally delayed resulting in elevated total serum bilirubin (TSB) levels. We found that newborn hUGT1 mice breastfed or orally treated with TCS presented lower TSB levels along with induction of hepatic UGT1A1. Lactational and oral treatment by gavage with TCS leads to the activation of hepatic nuclear receptors CAR, PPARα, and stress sensor, ATF4. When CAR-deficient hUGT1 mice (hUGT1/Car-/-) were treated with TCS, TSB levels were reduced with a robust induction of hepatic UGT1A1, leaving us to conclude that CAR is not tied to UGT1A1 induction. Alternatively, when PPAR-deficient hUGT1 mice (hUGT1/Ppar-/-) were treated with TCS, hepatic UGT1A1 was not induced. Additionally, we had previously demonstrated that TCS is a potent inducer of ATF4, a transcriptional factor linked to the integrated stress response. When ATF4 was deleted in liver of hUGT1 mice (hUGT1/Atf4∆Hep), and these mice treated with TCS, we observed superinduction of hepatic UGT1A1. Oxidative stress genes in livers of hUGT1/Atf4∆Hep treated with TCS were increased, suggesting that ATF4 protects liver from excessive oxidative stress. The increase oxidative stress may be associated with superinduction of UGT1A1. The expression of ATF4 in neonatal hUGT1 hepatic tissue may play a role in the developmental repression of UGT1A1.
2024-04-24 | GSE264293 | GEO
Project description:The effects of the antimicrobial triclosan (TCS) and its transformation product methyl-triclosan (MTCS) on the earthworm Eisenia fetida were investigated using GC-MS metabolomics. TCS is ubiquitous in sewage sludge, but a large proportion is transformed into MTCS during wastewater treatment and in soil when sewage sludge is applied to land. Our objective was to determine if earthworms exposed to ng/g to μg/g concentrations of TCS or MTCS exhibit toxic effects, and to identify the toxic mode of action of each compound. Ten individual earthworm replicates in 10 g worm bedding were exposed to 0, 0.25, 1, 4, 16, or 64 μg/g of either TCS or MTCS (120 experimental units) for 14 days. No mortalities were observed. All MTCS exposed worms had an instantaneous growth rate (IGR) over two times higher than the control during the study, but there was no effect of increasing concentration. Succinic acid was elevated relative to the control at concentrations ≥ 0.25 μg/g and glucose was elevated at 1 μg/g. There was separation from the control at all concentrations except 4 μg/g using Principal Components Analysis. Glucose, palmitic acid, and IGR contributed most strongly to the separation. Discriminant analysis with succinic acid, glucose, and IGR as variables showed a clear separation at all concentrations from the control along Canonical 1. Disruption of energy metabolism was hypothesized as a possible mode of action for MTCS.
2018-09-17 | MTBLS532 | MetaboLights
Project description:In the present study, we employed Affymetrix Staphylococcus aureus GeneChip arrays to investigate the dynamics of global gene expression profiles during the cellular response of Staphylococcus aureus to triclosan, which involved initial growth inhibition and metabolism. Keywords: Transcriptome study; antimicrobial response; time course
2007-08-25 | GSE8861 | GEO