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Elevated expression and potential roles of human Sp5, a member of Sp transcription factor family, in human cancers.

Abstract：

:In this report, we describe the expression and function of human Sp5, a member of the Sp family of zinc finger transcription factors. Like other family members, the Sp5 protein contains a Cys2His2 zinc finger DNA binding domain at the C-terminus. Our experiments employing Gal4-Sp5 fusion proteins reveal multiple transcriptional domains, including a N-terminal activity domain, an intrinsic repressive element, and a C-terminal synergistic domain. Elevated expression of Sp5 was noted in several human tumors including hepatocellular carcinoma, gastric cancer, and colon cancer. To study the effects of the Sp5 protein on growth properties of human cancer cells and facilitate the identification of its downstream genes, we combined an inducible gene expression system with microarray analysis to screen for its transcriptional targets. Transfer of Sp5 into MCF-7 cells that expressed no detectable endogenous Sp5 protein elicited significant growth promotion activity. Several of the constitutively deregulated genes have been associated with tumorigenesis (CDC25C, CEACAM6, TMPRSS2, XBP1, MYBL1, ABHD2, and CXCL12) and Wnt/beta-Catenin signaling pathways (BAMBI, SIX1, IGFBP5, AES, and p21WAF1). This information could be utilized for further mechanistic research and for devising optimized therapeutic strategies against human cancers.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Chen Y,Guo Y,Ge X,Itoh H,Watanabe A,Fujiwara T,Kodama T,Aburatani H

doi

10.1016/j.bbrc.2005.12.068

subject

Has Abstract

pub_date

2006-02-17 00:00:00

pages

758-66

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)02765-8

journal_volume

340

pub_type

杂志文章

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