Linked Life Data

16315320

Source:http://linkedlifedata.com/resource/pubmed/id/16315320

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2006-3-27
pubmed:abstractText
The lysosomal cysteine protease cathepsin B is implicated in degradation of extracellular matrix (ECM), a crucial step in a variety of physiological and pathological processes, including tumor dissemination and angiogenesis. In this study, we analyzed the contribution of extracellular and intracellular cathepsin B activity on the formation of capillary-like tubular structures by human umbilical vein endothelial cells (HUVECs) grown on Matrigel matrix, using general and specific cysteine protease inhibitors. We demonstrated, by confocal assay using quenched fluorescent protein substrate DQ-collagen IV, that endothelial cells degrade ECM both intracellularly and pericellularly. Intracellular cathepsin B activity detected by degradation of Z-Arg-Arg cresyl violet substrate was co-localized with the products of DQ-collagen IV degradation in the perinuclear region and in the capillary-like tubular structures. Treatment of cells with membrane-permeable CA-074 Me effectively abolished intracellular cathepsin B activity, and resulted in reduced tube length (32.3+/-9.4% at 10 microM), total tubule area (49.6+/-12.4% at 10 microM), and the number of branch points of tubules (47.5+/-7.7% at 10 microM) in a dose-dependent manner. In contrast, CA-074 (0.1-10 microM), a membrane-impermeable cathepsin B specific inhibitor, general cysteine protease inhibitors chicken cystatin (5 microM) and E-64 (10 microM), and the metalloprotease inhibitor Minocycline (10 microM) showed no significant inhibitory effect in our angiogenesis model. These results show that, besides multiple regulatory molecules, intracellular cathepsin B also contributes to the neovascularization process and should be considered as a potential therapeutic target.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0730-2312
pubmed:author
pubmed:copyrightInfo
Copyright (c) 2005 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
97
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1230-40
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Intracellular proteolytic activity of cathepsin B is associated with capillary-like tube formation by endothelial cells in vitro.
pubmed:affiliation
Department of Biochemistry and Molecular Biology, JoZef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. ales.premzl@ijs.si
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't