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Suteau V, Briet C, Lebeault M, Gourdin L, Henrion D, Rodien P, Munier M. Human amniotic fluid-based exposure levels of phthalates and bisphenol A mixture reduce INSL3/RXFP2 signaling. Environ Int 2020; 138:105585. [PMID: 32126385 DOI: 10.1016/j.envint.2020.105585] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 01/22/2020] [Accepted: 02/14/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND The presence of chemical pollutants in the environment can affect human health. Epidemiological and in vivo experimental studies reveal reprotoxic effects (undescended testis) of phthalates (diethylhexyl phthalate (DEHP), dibutyl phthalate (DBP)) and bisphenol A (BPA), resulting in particular of a decrease in INSL3 (Insulin-Like 3 peptide) production. This hormone is essential for normal testis development and acts on a G protein-coupled receptor: RXFP2. OBJECTIVES The aim of this study was to evaluate the individual and combined impacts of DEHP, DBP, and BPA on human RXFP2 (hRXFP2) activity. METHODS We used HEK293 cells transiently transfected with hRXFP2 and receptor activity was analyzed by measuring intracellular cAMP production. The mixture was established at concentrations reported in human amniotic fluid, for the three compounds. RESULTS Individually, DEHP, DBP and BPA increased the response to INSL3 by 19.3 to 27.5%. This potentiating effect was specific for RXFP2, because it was absent in the cells which did not express this receptor. On the other hand, and interestingly, the mixture of the three compounds reduced significantly the response to INSL3 by 12%, and the observed effects were opposite to those predicted, suggesting an antagonist effect. DISCUSSION-CONCLUSION Taken together, our results demonstrate for the first time that a mixture of phthalates and BPA present in human amniotic fluid disturbs the human RXFP2 function. Moreover, we demonstrate that mixture can produce potential antagonistic effects that are not displayed by the compounds, individually.
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Affiliation(s)
- Valentine Suteau
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France; Department of Endocrinology, University Hospital, 4 rue Larrey, 49933 Angers, France.
| | - Claire Briet
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France; Department of Endocrinology, University Hospital, 4 rue Larrey, 49933 Angers, France; Reference Center for Rare Diseases of Thyroid and Hormone Receptors, University Hospital, 4 rue Larrey, 49933 Angers, France.
| | - Maÿlis Lebeault
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France; Department of Endocrinology, University Hospital, 4 rue Larrey, 49933 Angers, France.
| | - Louis Gourdin
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France; Reference Center for Rare Diseases of Thyroid and Hormone Receptors, University Hospital, 4 rue Larrey, 49933 Angers, France.
| | - Daniel Henrion
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France.
| | - Patrice Rodien
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France; Department of Endocrinology, University Hospital, 4 rue Larrey, 49933 Angers, France; Reference Center for Rare Diseases of Thyroid and Hormone Receptors, University Hospital, 4 rue Larrey, 49933 Angers, France.
| | - Mathilde Munier
- UMR CNRS 6015, INSERM 1083, MITOVASC Institute, 3 rue Roger Amsler, 49000 Angers, France; Department of Endocrinology, University Hospital, 4 rue Larrey, 49933 Angers, France; Reference Center for Rare Diseases of Thyroid and Hormone Receptors, University Hospital, 4 rue Larrey, 49933 Angers, France.
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