Abstract:
:We recently reported enhanced tumor growth and stimulation of vascular endothelial growth factor (VEGF) expression in rat mammary carcinoma cells transfected with a human tissue inhibitor of metalloproteinases-1 (hTIMP-1) cDNA (1). In the present study, we examined if the composition of the stroma was altered in the tumors with the highest hTIMP-1 production. Immunohistological examination revealed increased amounts of the basement membrane (BM) components, type IV collagen and laminin, in the hTIMP-1 overexpressing tumors compared to that of the control. In vitro studies also revealed upregulation of type IV collagen and laminin gene expression associated with the hTIMP-1 overexpression. Endogenous RNA levels of rat TIMP-1 and the rat matrix metalloproteinases (MMPs), MMP-2, MMP-3, and MMP-9, were not affected by the hTIMP-1 transfection, suggesting that the increase in BM deposition was not a result of decreased collagenolytic activity. This is the first report to show an association between overexpression of TIMP-1 and increased tumor BM matrix production through stimulation of type IV collagen and laminin gene expression.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Yoshiji H,Buck TB,Harris SR,Ritter LM,Lindsay CK,Thorgeirsson UPdoi
10.1006/bbrc.1998.8805subject
Has Abstractpub_date
1998-06-29 00:00:00pages
605-9issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(98)98805-2journal_volume
247pub_type
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