期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 277, 期 13, 页码 10804-10812出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M112069200
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资金
- NCI NIH HHS [R01 CA58311] Funding Source: Medline
- NIDCR NIH HHS [R01 DE10845, P50 DE11906-01] Funding Source: Medline
The murine homologue of the ATF3 transcription factor increases tumor metastases but, surprisingly, represses 72-kDa type IV metalloproteinase (MMP-2) expression. The current study describes a novel mechanism by which ATF3 regulates transcription. Progressive deletions of the MMP-2 promoter indicated a 38-base pair region (-1659/-1622) necessary for the ATF3-mediated repression. This region lacked CREB/ AP-1 motifs but contained a consensus p53 motif shown previously to regulate MMP-2 expression. The activity of a p53 response element-driven luciferase reporter was reduced in ATF3-expressing HT1080 clones. Although MMP-2 promoter activity was not repressed by ATF3 in p53-deficient Saos-2 cells, p53 re-expression increased MMP-2 promoter activity and restored the sensitivity to ATF3. The activity of a GAL4-driven reporter in HT1080 cells co-expressing the full-length p53 sequence fused to the GAL4 DNA binding domain was diminished by ATF3 p53-ATF3 protein-protein interactions were demonstrated both in vivo and in vitro. Cell cycle analysis, performed as an independent assay of p53 function, revealed that gamma-irradiation-induced slowed G(2)/M cell. cycle progression (attributable to p53) was countered by ATF3. Thus, ATF3 represses MMP-2 expression by decreasing the trans-activation of this gene by p53.
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