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Vincent T. Lombardi Cancer Research Center and Department of Anatomy and Cell Biology, Georgetown University Medical Center, Washington, DC 20007
Although the Mr 72,000 type IV collagenase (matrix metalloproteinase 2) has been implicated in a variety of normal and pathogenic processes, its activation mechanism in vivo is unclear. We have found that fibroblasts from normal and neoplastic human breast, as well as the sarcomatous human Hs578T and HT1080 cell lines, activate endogenous matrix metalloprotease 2 when cultured on type I collagen gels, but not on plastic, fibronectin, collagen IV, gelatin, matrigel, or basement membrane-like HR9 cell matrix. This activation is monitored by the zymographic detection of Mr 59,000 and/or Mr 62,000 species, requires 23 days of culture on vitrogen to manifest, is cycloheximide inhibitable, and correlates with an arborized morphology. A similar activation pattern was seen in these cells in response to Concanavalin A but not transforming growth factor ß or 12-O-tetradecanoylphorbol-13-acetate. The interstitial matrix may thus play an important role in regulating matrix degradation in vivo.
1 Supported in part by NIH Grant UO1-CA51908.
2 To whom requests for reprints should be addressed, at Vincent T. Lombardi Cancer Research Center, Georgetown University Medical Center, 3800 Reservoir Road, Washington, DC 20007-2197.
Received 5/20/92. Accepted 6/29/92.
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