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(Received for publication, April 2, 1996, and in revised form, July 11, 1996)
From the Department of Molecular Biology and Research Center for
Cell Differentiation, Seoul National University, Seoul 151-742, Korea and the We report here that the ginseng saponins induce
the transcription of Cu,Zn-superoxide dismutase gene
(SOD1), which is one of the major antioxidant enzymes.
Total saponins and panaxatriol did not elevate the level of
SOD1, but panaxadiol significantly increased
SOD1. Among the panaxadiol fractions, ginsenoside
Rb2 was a more specific and more remarkable inducer of the
SOD1 gene than ginsenoside Rb1. Deletion
analyses of the SOD1 promoter revealed that the proximal
promoter is responsible for this induction. Mobility shift assays with
cis-elements in the proximal promoter region showed that
specific binding of the AP2 transcription factor was significantly
increased by treatment with ginsenoside Rb2. Mutations of
the AP2 binding sites in the heterologous promoter and natural context
systems abolished the transcriptional activation by ginsenoside
Rb2. These results suggest that the SOD1 gene
was greatly activated by ginsenoside Rb2 through
transcription factor AP2 binding sites and its induction.
Volume 271, Number 40,
Issue of October 4, 1996
pp. 24539-24543
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
and
Korea Ginseng and Tobacco Research
Institute, Taejon 305-345, Korea
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