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Mechanism Of Cell Surface Activation Of 72-kDa Type IV Collagenase
TLDR
Activation of 72T4Cl on the cell membrane provides a basic mechanism for spatially regulated extracellular proteolysis and presents a new target for prognosis and treatment of metastatic disease. Expand
SV40-transformed human lung fibroblasts secrete a 92-kDa type IV collagenase which is identical to that secreted by normal human macrophages.
TLDR
The complete structure of this enzyme is presented along with the evidence that it is identical to the 92-kDa metalloprotease secreted by normal human alveolar macrophages, phorbol ester-differentiated monocytic leukemia U937 cells, fibrosarcoma HT1080 cells, and cultured human keratinocytes. Expand
H-ras oncogene-transformed human bronchial epithelial cells (TBE-1) secrete a single metalloprotease capable of degrading basement membrane collagen.
TLDR
H-ras-transformed human bronchial epithelial cells (TBE-1) secrete a single major extracellular matrix metalloprotease which is not found in the normal parental cells, which is likely the human analog of type IV collagenase detected in several rodent tumors. Expand
Interaction of 92-kDa type IV collagenase with the tissue inhibitor of metalloproteinases prevents dimerization, complex formation with interstitial collagenase, and activation of the proenzyme with
TLDR
It is demonstrated that in the absence of TIMP, 92-kDa Type IV procollagenase (92T4Cl) can form a covalent homodimer and a novel complex with ClI, suggesting a mechanism for cooperative action of two enzymes in reducing collagen fibrils to small peptides under physiologic conditions. Expand
Alanine scanning mutagenesis and functional analysis of the fibronectin-like collagen-binding domain from human 92-kDa type IV collagenase.
TLDR
The results suggest that the gelatin binding of the type IV collagenase proenzyme is mediated by the FN-like domain, although the presence of another gelatin-binding site cannot be excluded. Expand
Interstitial Collagenase Is a Brownian Ratchet Driven by Proteolysis of Collagen
We show that activated collagenase (MMP-1) moves processively on the collagen fibril. The mechanism of movement is a biased diffusion with the bias component dependent on the proteolysis of itsExpand
Human skin fibroblast stromelysin: structure, glycosylation, substrate specificity, and differential expression in normal and tumorigenic cells.
TLDR
The data indicate that the expression and the possible involvement of secreted metalloproteases in tumorigenesis result from a specific interaction between the transforming factor and the target cell, which may vary in different species. Expand
Substrate Binding of Gelatinase B Induces Its Enzymatic Activity in the Presence of Intact Propeptide*
TLDR
It is demonstrated that gelatinolytic activity in situ, in tissue sections of term placenta, is co-localized with gelatinase B, suggesting that although activation of all known matrix metalloproteases in vitro is accomplished by proteolytic processing of the propeptide, other mechanisms, such as binding to a ligand or to a substrate, may lead to a disengagement of the proenzyme from the active center of the enzyme, causing its activation. Expand
Diffusion of MMPs on the Surface of Collagen Fibrils: The Mobile Cell Surface – Collagen Substratum Interface
TLDR
The finding that the inactivation of the enzymatic activity of MT1-MMP has a detectable negative effect on the cell force developed in miniaturized 3D tissue constructs suggests a new mechanism for the role of spatially regulated peri-cellular proteolysis in cell-matrix interactions. Expand
Adenovirus E1A represses protease gene expression and inhibits metastasis of human tumor cells.
Stable transfection of human tumor cell lines with the adenovirus-5 E1A gene repressed the expression of the secreted proteases, type IV collagenase, interstitial collagenase and urokinase. InExpand
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