Abstract
Oestrogens participate in various biological processes such as oogenesis, vitellogenesis and testicular development, but studies regarding the distribution and protein levels of oestrogen receptors (ERα and ERβ) and aromatase (Cyp19) in testis are rarely investigated in fish species. The aim of the present study was to analyse the expression pattern of ERα, ERβ and Cyp19 in testis of Astyanax rivularis and, in addition, to verify if oestrogenic contamination interferes in the expression levels of these proteins. Quarterly, field samplings were carried out during a reproductive cycle in a stream of the Upper Velhas River with a good conservation status (site S1). In the gonadal maturation peak (June), when ripe stage was most abundant, fish collection was made in three streams: S1, reference site, and S2 and S3, sites contaminated by untreated sewage. The results of immunohistochemistry demonstrated labelling of Cyp19 in Leydig cells and acidophilic granulocytes, but spermatogonia, Sertoli cells, spermatids and spermatozoa were also labelled. ERα was more widely distributed than ERβ being found in all developmental germ cell phases. On the other hand, ERβ was found only in spermatogonia and spermatocytes. During testicular maturation, ELISA levels for Cyp19, ERα and ERβ followed the gonadosomatic index (GSI) with significant higher values in the ripe stage. Regarding to endocrine disruption, the males exposed to domestic sewage presented significant higher expression of Cyp19 and ERα when compared to the non-exposed fish. Together, our results demonstrate expression patterns of Cyp19, ERα and ERβ in the testis of A. rivularis. In addition, we indicate ERα and Cyp19 as sensitive biomarkers for monitoring of oestrogenic contamination in freshwater environments.
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Acknowledgments
The authors would like to thank Bruna Toledo Maria for preparing the histological slides, Dr. Priscila Divina Diniz Alves for helping in immunofluorescence procedures and also to Stephen Latham for the valuable suggestions with the English language.
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The work was supported by Brazilian funding agencies: Conselho Nacional Científico e Tecnológico (CNPq 14/2012) and Fundação de Amparo a Pesquisa no Estado de Minas Gerais (FAPEMIG 01/2015 - CVZ-APQ-00898-15).
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Weber, A.A., Moreira, D.P., Melo, R.M.C. et al. Stage-specific testicular protein levels of the oestrogen receptors (ERα and ERβ) and Cyp19 and association with oestrogenic contamination in the lambari Astyanax rivularis (Pisces: Characidae). Environ Sci Pollut Res 25, 34403–34413 (2018). https://doi.org/10.1007/s11356-018-3392-1
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DOI: https://doi.org/10.1007/s11356-018-3392-1