Cell-type specific regulation of human interstitial collagenase-1 gene expression by interleukin-1 beta (IL-1 beta) in human fibroblasts and BC-8701 breast cancer cells.

Abstract

Interleukin-1 beta (IL-1 beta) is a potent cytokine that stimulates interstitial collagenase-1 (matrix metalloproteinase-1; MMP-1). In this study, we compared the mechanism(s) by which IL-1 beta induces collagenase gene expression in two very different cells, normal human foreskin fibroblasts (HFFs) and an aggressive breast cancer cell line, BC-8701 cells. Northern analysis showed that the time course of collagenase induction was distinct in the two cells: although both cells expressed low levels of MMP-1 constitutively, addition of IL-1 beta increased MMP-1 mRNA in HFFs by 1 h and levels remained high over a 24-h period. In contrast, MMP-1 levels in IL-1 beta-treated BC-8701 cells did not increase until 4 h, peaked by 12 h and then declined. To analyze the transcriptional response, we cloned and sequenced more than 4,300 bp of the human MMP-1 promoter, and from this promoter clone, we prepared a series of 5'-deletion constructs linked to the luciferase reporter and transiently transfected these constructs into both cell types to measure both basal and IL-1 beta induced transcription. When both cell types were uninduced, promoter fragments containing less than 2,900 bp gave only a minimal transcriptional response, while larger fragments showed increased transcriptional activity. With IL-1 beta treatment, significant responsiveness (P < 0.001) in HFFs was seen only with the larger fragments, while in the BC-8701 cells, all fragments were significantly induced with IL-1 beta. Finally, we found that IL-1 beta stabilized MMP-1 mRNA in normal fibroblasts, but not in BC-8701 breast cancer cells. We conclude that both the transcriptional and post-transcriptional regulation of MMP-1 gene expression by IL-1 beta is controlled by cell-type specific mechanisms, and we suggest that IL-1 induced MMP-1 expression in tumor cells and in neighboring stromal cells may amplify the invasive ability of tumor cells.

• Authors: J L Rutter, U Benbow, C I Coon, C E Brinckerhoff
• Journal: Journal of cellular biochemistry (J Cell Biochem) Vol. 66 Issue 3 Pg. 322-36 (Sep 01 1997) ISSN: 0730-2312 [Print] United States
• PMID: 9257189 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Interleukin-1
• RNA, Messenger
• Recombinant Proteins
• Dichlororibofuranosylbenzimidazole
• Luciferases
• Collagenases
• Matrix Metalloproteinase 1

Topics

• Base Sequence
• Breast Neoplasms (drug therapy, genetics, metabolism)
• Cloning, Molecular
• Collagenases (drug effects, genetics)
• Dichlororibofuranosylbenzimidazole (pharmacology)
• Fibroblasts (drug effects, metabolism)
• Gene Expression Regulation, Neoplastic
• Genes, jun
• Half-Life
• Humans
• Interleukin-1 (pharmacology)
• Luciferases (genetics, metabolism)
• Matrix Metalloproteinase 1
• Molecular Sequence Data
• Promoter Regions, Genetic
• RNA, Messenger
• Recombinant Proteins (drug effects, genetics, metabolism)
• Sequence Analysis, DNA
• Skin (cytology)
• Transcription, Genetic
• Tumor Cells, Cultured