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Structure-dependent activity of polybrominated diphenyl ethers and their hydroxylated metabolites on estrogen related receptor gamma: in vitro and in silico study
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0002-2088-6756
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2018 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 52, no 15, p. 8894-8902Article in journal (Refereed) Published
Abstract [en]

Estrogen-related receptor gamma (ERR gamma) is an orphan nuclear receptor having functional cross-talk with classical estrogen receptors. Here, we investigated whether ERR gamma is a potential target 8 of polybrominated diphenyl ethers (PBDEs) and their hydroxylated metabolites (OH-PBDEs). By using a fluorescence competitive binding method established in our laboratory, the binding potencies of 30 PBDEs/OH-PBDEs with ERR gamma were determined for the first time. All of the tested OH-PBDEs and some PBDEs bound to ERR gamma with K-d values ranging from 0.13-13.61 mu M. The OH-PBDEs showed much higher binding potency than their parent PBDEs. A quantitative structure-activity relationship (QSAR) model was developed to analyze the chemical binding potencies in relation to their structural and chemical characteristics. The QSAR model indicated that the molecular size, relative ratios of aromatic atoms, and hydrogen bond donors and acceptors were crucial factors for PBDEs/OH-PBDEs binding. By using a reporter gene assay, we found that most of the low-brominated PBDEs/OH-PBDEs exerted agonistic activity toward ERR gamma, while high-brominated PBDEs/OH-PBDEs had no effect on the basal ERR gamma activity. The docking results showed that the low-brominated PBDEs/OH-PBDEs tended to take an agonistic binding mode while the high-brominated ones tended to take an antagonistic binding mode. Overall, our results suggest ERR gamma to be a potential novel target for PBDEs/OH-PBDEs.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 52, no 15, p. 8894-8902
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:umu:diva-151394DOI: 10.1021/acs.est.8b02509ISI: 000441477600091PubMedID: 30005570Scopus ID: 2-s2.0-85050009923OAI: oai:DiVA.org:umu-151394DiVA, id: diva2:1245388
Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2023-03-24Bibliographically approved
In thesis
1. Improving alternatives assessment of plastic additives: exploring in silico tools to identify less hazardous flame retardants
Open this publication in new window or tab >>Improving alternatives assessment of plastic additives: exploring in silico tools to identify less hazardous flame retardants
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Alternatives assessment is applied for replacing hazardous chemicals with viable, safer substitutes. High quality experimental hazard data, however, are usually unavailable for this purpose, and obtaining in silico data is the only approach to fill in data gaps. In silico tools also have the advantage of providing a large amount of data with much lower cost and time requirements.

The aim of this PhD project was to explore the use of in silico tools for alternatives assessment, and develop practical tools for alternatives assessment of organic plastic additives. For this purpose, flame retardants were used as case chemicals. The major results were:

1. Quantitative structure-activity relationship (QSAR) models for endocrine disruption were developed and explored (Paper I and II). These developed models were able to identify chemical properties that impact the binding affinities of brominated organic chemicals with estrogen-related receptor γ (Paper I), and to predict the androgen receptor activity of several organic chemicals, including flame retardants (Paper II);

2. A hazard ranking tool was developed for alternatives assessment based on the hazard properties of persistence (P), bioaccumulation (B), mobility in the aquatic environment (M) and toxicity (T). The flame retardant decabromodiphenyl ether (decaBDE) and 16 of its alternatives were taken as case chemicals to develop the tool. From a comparison of experimental and in silico data for these case chemicals, hazard data predicted by in silico tools were identified as the more suitable data source for the hazard ranking tool as the experimental data were confounded by large data gaps (Paper III);

3. The inclusion of chemical transformation products for the hazard ranking tool were studied with the case of decaBDE and its alternatives. Several in silico tools were used to predict transformation products, and a strategy for prioritizing chemical transformations with high occurrence potential in the environment was developed (Paper IV);

4. Multicriteria decision analysis (MCDA) tools were used to evaluate diverse P, B, M and T endpoints of parent compounds (Paper III) and their transformation products (Paper IV) simultaneously based on in silico data. Three different MCDA methods were explored, and one of them was developed to include the consideration of uncertainties of in silico data;

5. In the studied case of decaBDE alternatives, the three different MCDA methods generally agreed on the most and least hazardous alternatives. With the consideration of hazard for the studied flame retardants and their in silico predicted transformation products, two alternatives, melamine and bis(2-ethylhexyl) tetrabromophthalate, were identified as the least hazardous of considered alternatives for decaBDE (Paper III and IV);

6. It is critical for the exposure aspect of alternatives assessment to identify the key properties that influence the emission process. For this, a fast measuring method for the emission of polymer additives was developed based on a Quartz Crystal Microbalance (QCM). Empirical linear models were applied to describe the emission patterns (Weibull model) to better understand the chemical mechanism behind the emissions of organophosphate flame retardants from various polymers. The results showed that the octanol-water partitioning coefficient and molecular size are key parameters for the emission process, but also showed that the emission process is complex and is likely driven by a combination of both polymer and additive properties, as well as their interactions (Paper V).

This research shows how alternatives assessment can make more effective use of in silico tools. and it also highlights current challenges in the use of these in silico tools that require further development. The next steps to make a holistic alternatives assessment would include an exposure assessment procedure based on the work in Paper V, and combining this with the hazard ranking tools (developed in Paper III and IV), including information on technical feasibilities, economic feasibilities, and also life cycle impacts. The MCDA methods for hazard ranking in Paper III and IV can be further adapted for the decision component of such a more complete alternatives assessment for specific uses of chemicals.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2021. p. 51
Keywords
Chemical alternatives assessment, plastic additives, flame retardants, hazard, emission, in silico, modeling, quantitative structure-activity relationship (QSAR), multi-criteria decision analysis (MCDA)
National Category
Organic Chemistry Environmental Sciences
Research subject
environmental science; Organic Chemistry; Ecotoxicology; Toxicology
Identifiers
urn:nbn:se:umu:diva-182073 (URN)978-91-7855-475-1 (ISBN)978-91-7855-476-8 (ISBN)
Public defence
2021-05-06, Glasburen, KBC-huset, Linnaeus väg 6, Umeå, 09:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas, 942-2015-672
Available from: 2021-04-15 Created: 2021-04-08 Last updated: 2021-05-04Bibliographically approved

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Zheng, ZiyeAndersson, Patrik L.

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