Description: In Wasser- und Abwasserproben wurden in juengerer Zeit verschiedentlich Medikamentenrueckstaende und hormonaktive Stoffe nachgewiesen. Einige dieser Stoffe koennen die selben rezeptorvermittelten Wirkungsmechanismen besitzen. Um die Gesamtwirkung und damit das Gesamtgefahrenpotential dieser Stoffe zu erfassen, sollte die Analytik mit einem entsprechenden Nachweis der 'Aktivitaet' (additive Schadwirkung) der Umweltprobe verknuepft werden. Dieser Ansatz ist der einfachste Weg, um die fuer die 'Aktivitaet' verantwortlichen Stoffe zu identifizieren. Projektziele: Ziel des Auftrags ist es, Methoden zu erarbeiten, die es erlauben, die Aktivitaet von Medikamentenrueckstaenden und hormonaktiven Stoffen in Umweltproben zu bestimmen. Umsetzung und Anwendungen: Die Resultate der Arbeit sind in Environ Health Perspect 108:621-629 (2000) publiziert. http://ehpnet1.niehs.nih.gov/docs/2000/108p621-629lascombe/abstract.html
Types:
SupportProgram
Origins:
/Bund/UBA/UFORDAT
Tags:
Synergistische Wirkung
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Biomarker
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Endokrine Wirkung
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Arzneimittel
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Rückstandsanalyse
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Schadstoffwirkung
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Zusatzstoff
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Wirkungsmonitoring
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Schädliche Umwelteinwirkung
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Abwasseruntersuchung
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Analyseverfahren
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Arzneimittelrückstand
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Bestimmungsmethode
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Chemische Zusammensetzung
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Hormon
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Risikoanalyse
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Wasserprobe
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Wasseruntersuchung
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Wirkungsanalyse
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Wirkungsforschung
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Abwasserprobe
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Endokrin aktive Substanz
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Aktivitätsmessung
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Analytik
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Hormonaktive-Stoffe
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In-vitro-Test
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Methodenbank
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Rezeptor
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endocrine disrupters
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environmental effect monitoring
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receptor based assay
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License: cc-by-nc-nd/4.0
Language: Deutsch
Organisations
Time ranges:
1999-02-22 - 2000-08-15
Alternatives
-
Language: Englisch/English
Title: Methods for recording the effect of medicines and active hormonal substances
Description: Environmental chemicals with estrogenic activities have been suggested to be associated with deleterious effects in animals and humans. To characterize estrogenic chemicals and their mechanisms of action, we established in vitro and cell culture assays that detect human estrogen receptor (hER)-mediated estrogenicity. First, we assayed chemicals to determine their ability to modulate direct interaction between the hER and the steroid receptor coactivator-1 (SRC-1) and in a competition binding assay to displace 17 beta-estradiol (E2). Second, we tested the chemicals for estrogen-associated transcriptional activity in the yeast estrogen screen and in the estrogen-responsive MCF-7 human breast cancer cell line. The chemicals investigated in this study were o,p -DDT (racemic mixture and enantiomers), nonylphenol mixture (NPm), and two poorly analyzed compounds in the environment, namely, tris-4-(chlorophenyl)methane (Tris-H) and tris-4-(chlorophenyl)methanol (Tris-OH). In both yeast and MCF-7 cells, we determined estrogenic activity via the estrogen receptor (ER) for o,p -DDT, NPm, and for the very first time, Tris-H and Tris-OH. However, unlike estrogens, none of these xenobiotics seemed to be able to induce ER/SRC-1 interactions, most likely because the conformation of the activated receptor would not allow direct contacts with this coactivator. However, these compounds were able to inhibit (3H)-E2 binding to hER, which reveals a direct interaction with the receptor. In conclusion, the test compounds are estrogen mimics, but their molecular mechanism of action appears to be different from that of the natural hormone as revealed by the receptor/coactivator interaction analysis. Key words: coactivator SRC-1, environmental chemicals, estrogen receptor , MCF-7 cells, transcriptional activity, xenoestrogen, yeast. Environ Health Perspect 108:621-629 (2000). (Online 26 May 2000) http://ehpnet1.niehs.nih.gov/docs/2000/108p621-629lascombe/abstract.html. (FRA)
https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=76926
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