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J Biol Chem, Vol. 275, Issue 19, 14013-14016, May 12, 2000
From the Department of Molecular Biology and Applied Physiology,
Tohoku University School of Medicine, Aoba-ku, Sendai, Miyagi 980-8575, Japan, Microphthalmia-associated transcription factor
(Mitf) plays a critical role in the development of neural crest-derived
melanocytes. Here, we show that exogenously added Wnt-3a protein, an
intercellular signaling molecule, up-regulates the expression of
endogenous melanocyte-specific Mitf (Mitf-M) mRNA in cultured
melanocytes. The melanocyte-specific promoter of the human
MITF gene (MITF-M promoter) contains a
functional LEF-1-binding site, which is bound in vitro by
LEF-1 and confers the preferential expression on a reporter gene in
melanocytes and melanoma cells, as judged by the transient transfection
assays. Moreover, the LEF-1-binding site is required for the
transactivation of a reporter gene by LEF-1,
ACCELERATED PUBLICATION
Induction of Melanocyte-specific Microphthalmia-associated
Transcription Factor by Wnt-3a*
,
§,
Kondoh Differentiation Signaling Project, ERATO,
Japan Science and Technology Corporation (JST), 14 Yoshidakawaramachi,
Sakyo-ku, Kyoto 606-8305, Japan, and § Center for Molecular
and Developmental Biology, Graduate School of Science, Kyoto
University, Sakyo-ku, Kyoto 606-8502, Japan
-catenin, or their
combination. Exogenously added Wnt-3a protein also transactivates the
MITF-M promoter via the LEF-1-binding site; this activation
was abolished when a dominant-negative form of LEF-1 was coexpressed.
These results suggest that Wnt-3a signaling recruits
-catenin and
LEF-1 to the LEF-1-binding site of the MITF-M promoter.
Therefore, the present study identifies Mitf-M/MITF-M as a direct
target of Wnt signaling.
*
This work was supported in part by grants-in-aid for
scientific research (B), for exploratory research, and for
encouragement of young scientist (to K. Y.) from the Ministry of
Education, Science, Sports and Culture of Japan. This work was also
supported in part by the Nakatomi Foundation and the Kao Foundation for Arts and Sciences.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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