Abstract
Endocrine-disrupting chemicals can influence the hypothalamus–pituitary–gonad axis and possibly affect reproduction in vertebrates. We analyzed the effect of 30-day endosulfan (ES) exposure in sexually undifferentiated larvae of the cichlid fish Cichlasoma dimerus. The number, area, mean cytoplasmic and nuclear diameter, and mean cytoplasmic optical density of gonadotropin-releasing hormone (GnRH) I, II, and III immunoreactive (ir-) neurons and β follicle-stimulating hormone (βFSH) ir-cells were measured. Animals exposed to the highest ES concentration (0.1 μg/l) showed a decrease in GnRH I nucleus/cytoplasm area ratio upon exposure. Nuclear area and mean nuclear diameter of βFSH ir-cells was higher in ES treated fish. βFSH nucleus/cytoplasm area ratio was high in exposed animals, and animals exposed to 0.1 μg/l ES showed smaller mean cytoplasmic optical density. These findings suggest that ES affects GnRH I and βFSH protein synthesis/release. However, these responses seem to be insufficient to affect gonadal differentiation at this stage of development.
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Acknowledgments
We are grateful to R. Da Cuña for helpful suggestions to the manuscript. This work was supported by the National Council of Scientific and Technical Research (CONICET, PIP 5877 and 2302) and the University of Buenos Aires (UBACyT, x457).
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Piazza, Y.G., Pandolfi, M. & Lo Nostro, F.L. Effect of the Organochlorine Pesticide Endosulfan on GnRH and Gonadotrope Cell Populations in Fish Larvae. Arch Environ Contam Toxicol 61, 300–310 (2011). https://doi.org/10.1007/s00244-010-9621-3
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DOI: https://doi.org/10.1007/s00244-010-9621-3