Abstract
Perfluorinated compounds (PFCs) are a large group of chemicals used in different industrial and commercial applications. Studies have suggested the potential of some PFCs to disrupt endocrine homeostasis, increasing the risk of adverse health effects. This study aimed to elucidate mechanisms behind PFC interference with steroid hormone receptor functions. Seven PFCs [perfluorohexane sulfonate (PFHxS), perfluorooctane sulfonate (PFOS), perfluorooctanoate (PFOA), perfluorononanoate (PFNA), perfluorodecanoate (PFDA), perfluoroundecanoate (PFUnA), and perfluorododecanoate (PFDoA)] were analyzed in vitro for their potential to affect estrogen receptor (ER) and androgen receptor (AR) transactivity as well as aromatase enzyme activity. The PFCs were assessed as single compounds and in an equimolar mixture. PFHxS, PFOS and PFOA significantly induced the ER transactivity, whereas PFHxS, PFOS, PFOA, PFNA and PFDA significantly antagonized the AR activity in a concentration-dependent manner. Moreover, PFDA weakly decreased the aromatase activity at a high test concentration. A mixture effect more than additive was observed on AR function. We conclude that five of the seven PFCs possess the potential in vitro to interfere with the function of the ER and/or the AR. The observed mixture effect emphasizes the importance of considering the combined action of PFCs in future studies to assess related health risks.
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Abbreviations
- 4-AOD:
-
4-Androsten-4-ol-3,17-dione
- AR:
-
Androgen receptor
- CA:
-
Concentration addition
- CV:
-
Coefficient of variation
- CYP:
-
Cytochrome P450
- DHT:
-
Dihydrotestosterone
- DMSO:
-
Dimethyl sulfoxide
- E2:
-
17β-Estradiol
- ER:
-
Estrogen receptor
- HF:
-
Hydroxyflutamide
- LDH:
-
Lactate dehydrogenase
- LOEC:
-
Lowest observed effect concentration
- MOEC:
-
Maximum observed effect concentration
- PFAA:
-
Perfluoroalkyl acid
- PFC:
-
Perfluorinated compound
- PFDA:
-
Perfluorodecanoate
- PFDoA:
-
Perfluorododecanoate
- PFHxS:
-
Perfluorohexane sulfonate
- PFNA:
-
Perfluorononanoate
- PFOA:
-
Perfluorooctanoate
- PFOS:
-
Perfluorooctane sulfonate
- PFUnA:
-
Perfluoroundecanoate
- POP:
-
Persistent organic pollutant
- SC:
-
Solvent control
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Acknowledgments
This study was supported by the Danish Strategic Research Council and Aarhus University. We thank lab technician Dorte Olsson for the technical support, performing the ER transactivation bioassays, as well as the aromatase enzyme activity bioassays, and our colleagues at the Centre for Arctic Health for scientific support.
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The authors declare that there are no conflicts of interest.
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Kjeldsen, L.S., Bonefeld-Jørgensen, E.C. Perfluorinated compounds affect the function of sex hormone receptors. Environ Sci Pollut Res 20, 8031–8044 (2013). https://doi.org/10.1007/s11356-013-1753-3
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DOI: https://doi.org/10.1007/s11356-013-1753-3