期刊
TOXICOLOGY LETTERS
卷 131, 期 1-2, 页码 65-74出版社
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/S0378-4274(02)00043-7
关键词
vitellogenin; half-life; kinetics; fathead minnow; ethinylestradiol; fitness
类别
A lack of knowledge persists concerning the combination of kinetics on protein and mRNA levels of the most commonly used biomarker for estrogenic influences-vitellogenin (VTG). Consequently, male fathead minnows were exposed to 17alpha-ethinylestradiol (EE2) for 35 days, followed by an equally long depuration period in a flow-through system. VTG mRNA levels reached a plateau after 3 days of exposure, which remained stable until 3 days after EE2 removal. Control levels were re-attained within 7 days of the depuration phase. VTG protein accumulated in the plasma following a two-phased model. The first phase depicting an exponential increase lasted 15 days and was followed by a saturation phase approaching a plateau of approximately 47 mg VTG/ml plasma. Clearance kinetics could be described by a two-compartment open model, with half-lives of 2.17 and 21.32 days for the alpha- and beta-phases, respectively. In addition, a high VTG protein synthesis rate seemed to adversely affect fitness and mortality of the fish. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
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