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(Received for publication, July 15, 1996, and in revised form, October 15, 1996)
From the Department of Biology and Biochemistry, Brunel University,
Uxbridge, Middlesex UB8 3PH, United Kingdom
The ability of certain man-made chemicals to
mimic the effects of natural steroid hormones and their potential to
disrupt the delicate balance of the endocrine system in animals are of increasing concern. The growing list of reported hormone-mimics includes the alkylphenolic (AP) compounds, a small number of which have
been reported to be weakly estrogenic. In their most basic form, APs
are composed of an alkyl group, which can vary in size, branching, and
position, joined to a phenolic ring. The aim of this project was to
identify the important structural features responsible for the
estrogenic activity of AP chemicals. This was achieved by incubating
APs with different structural features in a medium containing a
previously described estrogen-inducible strain of yeast
(Saccharomyces cerevisiae) expressing the human estrogen
receptor and comparing their activity spectrophotometrically by the
resulting color change of the medium. The results were compared to the
effects of the main natural estrogen 17
Volume 272, Number 6,
Issue of February 7, 1997
pp. 3280-3288
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
-estradiol. The data indicate
that both the position (para > meta > ortho) and branching (tertiary > secondary = normal) of the alkyl group affect estrogenicity. Optimal estrogenic
activity requires a single tertiary branched alkyl group composed of
between 6 and 8 carbons located at the para position on an
otherwise unhindered phenol ring. The results are discussed in relation
to the purity and composition of the chemicals tested.
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