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J. Exp. Med.,
Volume 189, Number 1, January 4, 1999 63-73
By
From the Division of Molecular Oncology, Biomedical Research Center, Osaka University Medical
School, Suita, Osaka 565-0871, Japan
The signal transducers and activators of transcription (STAT) family members have been implicated in regulating the growth, differentiation, and death of normal and transformed cells in response to either extracellular stimuli, including cytokines and growth factors, or intracellular
tyrosine kinases. c-myc expression is coordinately regulated by multiple signals in these diverse cellular responses. We show that STAT3 mostly mediates the rapid activation of the c-myc gene
upon stimulation of the interleukin (IL)-6 receptor or gp130, a signal transducing subunit of
the receptor complexes for the IL-6 cytokine family. STAT3 does so most likely by binding to
cis-regulatory region(s) of the c-myc gene. We show that STAT3 binds to a region overlapping
with the E2F site in the c-myc promoter and this site is critical for the c-myc gene promoter-
driven transcriptional activation by IL-6 or gp130 signals. This is the first identification of the
linkage between a member of the STAT family and the c-myc gene activation, and also explains
how the IL-6 family of cytokines is capable of inducing the expression of the c-myc gene.
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