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J. Biol. Chem., Vol. 276, Issue 9, 6191-6199, March 2, 2001
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§,
¶,
From the Division of Tumor Biology, Netherlands Cancer Institute,
Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
The mucin-like glycoprotein episialin (MUC1) is
highly overproduced by a number of human carcinomas. We have shown
previously in a variety of mammalian cell lines that overexpression of
this very large transmembrane molecule diminishes cellular adhesion, suggesting that episialin/MUC1 overexpression may play an important role in tumor invasion and metastasis. By using in situ
hybridization, we show here that episialin/MUC1 mRNA expression can
be increased more than 10-fold in breast carcinoma cells relative to
the expression in adjacent normal breast epithelium. In search of the
molecular mechanism of this overexpression, we observed that the
episialin/MUC1 promoter contains a candidate binding site
for transcription factors of the STAT family ~500 base pairs upstream
of the transcription start site. Cytokines and/or growth factors such
as interleukin-6 or interferon-
can activate STATs. In the human
breast carcinoma cell line T47D, both compounds are able to stimulate
transcription of a luciferase reporter gene under the control of a
750-base pair MUC1 promoter fragment proximal to the
transcription start site. The observed increase is entirely mediated by
the single STAT-binding site, since mutation of this site abolishes
stimulation of the reporter by interleukin-6 and interferon-
. In
addition, mutation of the STAT site also decreased the promoter
activity in nonstimulated T47D cells, suggesting that the STAT-binding site is among the elements that are involved in the overexpression of
MUC1 in tumor cells.
Both authors contributed equally to this work.
§
Supported by NCI Grant 1R01 CA79580-01 from the National Institutes
of Health.
¶
Supported by Grant 93-523 of the Dutch Cancer Society.
To whom correspondence should be addressed. Tel.:
31-20-5122018; Fax: 31-20-5122029; E-mail: jhi@nki.nl.
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