ABSTRACT
Cefadroxil and cefradine have frequently been detected in surface waters, however toxicological studies in aquatic organisms have mostly been limited to acute lethal effects. In the present study, endocrine disruption caused by cefadroxil and cefradine, and its underlying mechanism were investigated by chronic exposure of Daphnia magna (21 d) and Oryzias latipes (120 d). In medaka fish, the effects on growth, mortality, and reproduction, as well as on the levels of hormones and genes related to the hypothalamic-pituitary-gonad (HPG) axis, were investigated after 120 d exposure. In D. magna, the chronic effects on growth were observed at the highest concentration of 83.0 mg L-1 cefadroxil and 80.8 mg L-1 cefradine. The growth of juvenile fish was significantly impaired by exposure to cefradine. Following exposure to cefadroxil and cefradine for 120 d, sex-dependent changes in E2 hormones were observed and their levels were supported by the regulation of genes along the HPG axis. We found that chronic exposure to cefadroxil and cefradine impaired growth and reproduction in a freshwater invertebrate and fish, and altered the levels of sex hormones and genes associated with the HPG axis in fish.
Subject(s)
Cefadroxil/toxicity , Cephradine/toxicity , Water Pollutants, Chemical/toxicity , Animals , Daphnia/drug effects , Endocrine Disruptors/toxicity , Endocrine System/drug effects , Fresh Water , Gonadal Steroid Hormones , Male , Oryzias/physiology , Reproduction/drug effects , Toxicity Tests, ChronicABSTRACT
Sä discutidas as propriedades microbiológicas, a farmacocinética, os usos clínicos e a toxicologia do cefadroxil, uma cefalosporina para uso oral. Säo destacados os níveis séricos prolongados após administraçäo oral, permitindo tratamento em duas tomadas ao dia. Säo revistas avaliaçöes clínicas, recentes, em várias doenças infecciosas
