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• W1549209983 abstract "The human tissue inhibitor of metalloproteinases (TIMP) is a glycoprotein with a molecular weight of 28,000. It appears to be ubiquitous in human mesoderm tissues and has previously been shown to be identical to the collagenase inhibitor isolated from human skin fibroblasts. TIMP inhibits type I- and IV-specific collagenases and other neutral metalloendoproteinases that may be responsible for the degradation of extracellular matrix in tumor cell metastasis. In this work we have utilized recombinant human TIMP (rTIMP) obtained by expression of its cDNA gene (Carmichael et al., Proc. Natl. Acad. Sci. USA, 83:2407, 1986). The rTIMP is shown to have similar inhibition properties as natural TIMP against human skin fibroblast collagenase. In an in vitro amnion invasion assay system, rTIMP inhibited the invasion of B16-F10 murine melanoma cells through the human amniotic membrane at an identical concentration to that reported previously for natural TIMP. The mechanism by which rTIMP inhibits amniotic membrane invasion was compared to the mechanism by which the fibronectin receptor binding peptide RGDS and the aminin receptor binding peptide YIGSR inhibit amnion invasion. RGDS and YIGSR inhibited strong binding of the tumor cells to the amniotic membrane. In contrast rTIMP did not inhibit the cell adhesion step in amnion invasion, but actually increased the number of tumor cells that were tightly bound to the amnion. Thus rTIMP appears to inhibit a later step in the amnion invasion process, following B16-F10 cell adhesion. C57BL/6 mice treated with i.p. injections of rTIMP every 12 h for 6.5 days showed a significant inhibition of metastatic lung colonization by B16-F10 murine melanoma cells. While the rTIMP inhibited the number of metastatic lung tumors formed, it had no significant effect on the size of the lung tumors. Furthermore, tumors grown s.c. in mice receiving 12-h i.p. injections of rTIMP for 6.5 days, as in the in vivo colonization assay, showed no difference in size from controls. Thus the anticolonization effect of rTIMP appears not be due to an effect on tumor growth, but on the invasion step itself. The inhibition of lung colonization in C57BL/6 mice by rTIMP is one of the first examples showing an antimetastatic effect of a selective metalloproteinase inhibitor in a mammalian animal model, and supports an essential role for metalloproteinase(s) in the extravasation and invasion of tumor cells during lung colonization by blood-borne tumor cells." @default.
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• W1549209983 date "1988-10-01" @default.
• W1549209983 modified "2023-10-17" @default.
• W1549209983 title "Inhibition by human recombinant tissue inhibitor of metalloproteinases of human amnion invasion and lung colonization by murine B16-F10 melanoma cells." @default.
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