Vitellogenin in African Sharptooth Catfish (Clarias gariepinus): Purification, Characterization, and Elisa Development

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dc.contributor.authorBraathen, M
dc.contributor.authorMdegela, R. H.
dc.contributor.authorCorreia, D
dc.contributor.authorRundberget, T
dc.contributor.authorMyburgh, J
dc.contributor.authorBotha, C
dc.contributor.authorSkaare, J.U
dc.contributor.authorSandvik, M
dc.date.accessioned2017-03-23T08:35:42Z
dc.date.available2017-03-23T08:35:42Z
dc.date.issued2009-01-30
dc.descriptionJournal of Toxicology and Environmental Health, Part A 2009, 72: 173–183en_US
dc.description.abstractVitellogenin (Vtg) induction in African sharptooth catfish (Clarias gariepinus) was assessed in order to develop a method for monitoring estrogenic pollution in African freshwater systems. Clarias gariepinus Vtg (Cg-Vtg) was purified from serum obtained from 17a-ethynylestradiol (EE2)-exposed fish and polyclonal antibodies against Cg-Vtg were raised. An enzyme-linked immunosorbent assay (ELISA) was developed and the induction and kinetics of Vtg were assessed in male fish in three different exposure trials using both natural estrogen (17a-estradiol [E2]) and synthetic EE2. Concentrations of EE2 in water and levels of EE2 conjugates in bile were quantified by liquid chromatography– mass spectrometry (LC-MS). In addition, co-administration of E2 and benzo[a]pyrene (BaP) were studied. Vtg was induced in all exposure trials and the maximum induction was observed 1 wk after exposure. Exposure of male C. gariepinus to 1.4, 2.7, and 13.9 mg/ml EE2 induced Vtg synthesis at all concentrations. BaP did not influence the Vtg kinetics. However, an increased rate of biliary excretion of EE2 was observed when BaP was additionally administered. In conclusion, Vtg is induced in male C. gariepinus after exposure to both E2 and EE2, rendering it a suitable biomarker for endocrine-disrupting chemicals in African freshwater systems.en_US
dc.identifier.issn1528-7394
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/123456789/1356
dc.language.isoenen_US
dc.subjectAfrican Sharptooth Catfishen_US
dc.subjectClarias gariepinusen_US
dc.subjectElisa Developmenten_US
dc.subjectAfrican freshwater systemsen_US
dc.subjectVitellogenin inductionen_US
dc.subjectEstrogenic pollutionen_US
dc.titleVitellogenin in African Sharptooth Catfish (Clarias gariepinus): Purification, Characterization, and Elisa Developmenten_US
dc.typeArticleen_US
dc.urlDOI: 10.1080/1528739080253912en_US

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