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J. Biol. Chem., Vol. 275, Issue 34, 26245-26251, August 25, 2000
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§,
§¶,
,

, and
§§
From the Caveolin-3 protein is the only member of the
caveolin family that shows a unique muscle-specific expression pattern,
and loss of its functional activity causes muscular dystrophy.
Caveolin-3 mRNA levels are dramatically increased during the
formation of myotubes in the C2C12 cell line. In this study, we
characterized the human caveolin-3 5'-flanking region. Promoter
analyses demonstrate that the proximal E box element serves as a
myogenin binding site and is both necessary and sufficient to control
caveolin-3 gene transcription. Transient transfection assays indicated
that overexpression of myogenin activates caveolin-3 reporter gene
expression, whereas Id2 overexpression inhibited caveolin-3 promoter
activation by myogenin. A mutant Id2 protein lacking the HLH
domain was not capable of suppressing myogenin-mediated activation.
Determination of caveolin-3 transcript distribution patterns in
vivo revealed that mRNA was first detectable at day 10 of
gestation in the developing somites and heart. Caveolin-3 protein in
myoblasts and myotubes was expressed in both the plasma membrane and
vesicular structures. During skeletal myogenesis the level of Id2, an
inhibitor of differentiation, decreases, allowing the induced
basic helix-loop-helix transcription factor myogenin to form
transcriptionally active heterodimers that bind to the caveolin-3
promoter and thereby mediate its transcription.
University of California, San Francisco,
School of Medicine, Cancer Research Institute, San Francisco,
California 94143-0128, the
Institute of Pathology, University
Hospital RWTH Aachen, D-52074 Aachen, Germany, and the ** University of
California, San Francisco, Preuss Laboratory for Molecular
Neuro-Oncology, Brain Tumor Research Center, Department of Neurological
Surgery, San Francisco, California 94143-0520
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AF204690.
§ These authors contributed equally to this work. ¶ Recipient of a Deutscher Akademischer Austausch Dieust (DAAD) fellowship as part of the Gemeinsames Hochschulsonderprogramm III von Bund und Laendern.
Supported by the David A. Wood Foundation.
§§
To whom correspondence should be addressed: Inst. of Pathology,
University Hospital, RWTH Aachen, Pauwelsstrasse 30, D-52074 Aachen,
Germany. Tel.: 49-241-8089280; Fax: 49-241-8888439; E-mail: Buettner@pat.rwth-aachen.de.
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