Regulating expression of the gene for matrix metalloproteinase-1 (collagenase): Mechanisms that control enzyme activity, transcription, and mRNA stability

被引:224
作者
Vincenti, MP [1 ]
White, LA [1 ]
Schroen, DJ [1 ]
Benbow, U [1 ]
Brinckerhoff, CE [1 ]
机构
[1] DARTMOUTH COLL SCH MED, DEPT BIOCHEM, HANOVER, NH 03755 USA
来源
CRITICAL REVIEWS IN EUKARYOTIC GENE EXPRESSION | 1996年 / 6卷 / 04期
关键词
enzyme activation and inhibition; phorbol esters; cytokines; growth factors; retinoids; glucocorticoids; transfection; connective tissue;
D O I
10.1615/CritRevEukarGeneExpr.v6.i4.40
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Matrix metalloproteinase-1 (MMP-1) is one of three collagenases that can degrade the interstitial collagens, types I, II, and III at neutral pH. As these collagens are the most abundant proteins in the body, collagenase plays a critical role in modeling and remodeling the extracellular matrix. Therefore, it is not surprising that MMP-1 gene expression can be regulated at multiple points. Procollagenase can be activated by mechanisms that generate an active enzyme with differing specific activities, and the active enzyme can be inhibited by complexing with either the tissue inhibitor of metalloproteinases (TIMPs) or alpha(2) macroglobulin. The activator protein-1 (AP-1) site in the collagenase promoter plays a prominent role in the transcriptional control of the collagenase gene. It is essential for basal transcription, and contributes to induction by phorbol esters, although other sites in the proximal promoter are essential. In contrast, transactivation by cytokines such as Interleukin-l depends on sequences in more distal regions of the promoter. Posttranscriptional mechanisms also regulate gene expression, and several cytokines and growth factors increase the stability of the collagenase transcript. Finally, glucocorticoid hormones repress transcription of the collagenase gene by the interaction of glucocorticoid receptors with the AP-1 proteins, Fos and Jun. Retinoids also suppress transcription by mechanisms that involve downregulation of fos and jun mRNA, sequestration of Fos and Jun proteins, and the formation of complexes of retinoic acid receptors (RAR/RXR heterodimers) and AP-1 proteins on the DNA. These multiple points of regulation assure precise control of collagenolytic activity in a variety of physiologic and pathologic conditions.
引用
收藏
页码:391 / 411
页数:21
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