Secretion of metalloproteinases by stimulated capillary endothelial cells. I. Production of procollagenase and prostromelysin exceeds expression of proteolytic activity - PubMed (original) (raw)
. 1986 Feb 25;261(6):2810-3.
- PMID: 3005265
Free article
Secretion of metalloproteinases by stimulated capillary endothelial cells. I. Production of procollagenase and prostromelysin exceeds expression of proteolytic activity
G S Herron et al. J Biol Chem. 1986.
Free article
Abstract
We have characterized the biosynthesis of two metalloproteinases, procollagenase and prostromelysin, by rabbit brain capillary endothelial cells (RBCE) by means of immunochemical, biosynthetic, and functional assays. Unstimulated RBCE secreted no detectable metalloproteinases. Secretion of both procollagenase and prostromelysin was induced within 6 h by treating the cells with 50 ng/ml 12-O-tetradecanoylphorbol-13-acetate. In treated cells, the two proenzymes accounted for up to 20% of the [35S]methionine-labeled secreted proteins; about 15 micrograms of each protein was secreted in 48 h by 10(6) RBCE. Although RBCE secreted approximately as much procollagenase and prostromelysin as did rabbit fibroblasts, virtually no enzyme activity could be measured in RBCE-conditioned medium, even after activation of the proenzymes by trypsin or an organomercurial agent.
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