INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Unidad Ejecutora - UE
Impairments on aromatase expression, reproductive behavior and sperm quality of male fish exposed to 17â-estradiol.
GUYÓN N.F.; ROGGIO M.A.; AMÉ, M.V.; HUED, A.C.; VALDÉS, M.E.; GIOJALAS, L.; WUNDERLIN, D.A.; BISTONI, M.A.
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
Lugar: Pensacola; Año: 2012 vol. 31 p. 935 - 935
There is growing evidence that environmental estrogen can reach high enough levels to exert adverse reproductive effects on wild fish populations. We report different parameters of male reproductive behavior, brain and gonadal aromatase expression,and sperm quality in an internally fertilizing fish species (Jenynsia multidentata, Jenyns) exposed to environmentally relevant concentrations of 17â-estradiol (E2). Adult males were exposed 0, 50, 100 and 250 ng/L E2 during 28 d. Our findings demonstrated that E2 exposure resulted in a very clear increase in brain aromatase transcript abundance at all assayed concentrations in comparison to control, however no effects on gonadal aromatase expression were observed. Behavioral measures revealed an exacerbated sexual activity at 50ng/L E2. In contrast to the molecular and behavioral responses, the condition factor, gonadosomatic index and sperm quality were unaltered by E2 exposure. The results from the present work suggest that E2 affects some aspects of the reproductive biology of J. multidentata. These modifications in the reproductive biology caused by exposure to E2 could potentially lead to long term effects at population levels that may not always be immediately evident. To the extent of our knowledge, this is the first report on the combined effect of E2 on several reproductive fish functions.