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2001 ; 92
(3
): 257-68
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Targets of transcriptional regulation by transforming growth factor-beta:
expression profile analysis using oligonucleotide arrays
#MMPMID11267935
Akiyoshi S
; Ishii M
; Nemoto N
; Kawabata M
; Aburatani H
; Miyazono K
Jpn J Cancer Res
2001[Mar]; 92
(3
): 257-68
PMID11267935
show ga
Transforming growth factor-betas (TGF-betas) are potent inhibitors of cell
proliferation, and disruption of components of the TGF-beta signaling pathway
leads to tumorigenesis. Mutations of transmembrane receptors and Smads mediating
intracellular signaling have been reported in various cancers. To identify
transcriptional targets of TGF-beta, we conducted an expression profile analysis.
HaCaT cells derived from human keratinocytes and highly sensitive to TGF-beta
were treated with TGF-beta in the absence or presence of cycloheximide (CHX).
mRNAs extracted from the HaCaT cells were used for hybridization of
oligonucleotide arrays representing approximately 5600 human genes. TGF-beta
increased the expression of PAI-1, junB, p21 cdk inhibitor, Smad7, betaIG-H3, and
involucrin that have been reported to be up-regulated by TGF-beta, validating the
usefulness of this approach. The induction of betaIG-H3 by TGF-beta was
completely abolished by CHX, suggesting that the transcription of betaIG-H3 is
not directly regulated by TGF-beta. Unexpectedly, we identified more genes
down-regulated by TGF-beta than up-regulated ones. TGF-beta repressed the
expression of epithelial specific Ets that may be involved in breast and lung
tumorigenesis, which could contribute to tumor suppression by TGF-beta. Among a
panel of cell cycle regulators, TGF-beta induced the expression of p21 cdk
inhibitor; however, the induction of other cdk inhibitors was not significant in
the present study. Taken together, the results suggest that TGF-beta may suppress
tumorigenesis through positive and negative regulation of transcription.