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pubmed-article:17689495pubmed:abstractTextThe endoglycosidase heparanase is the predominant enzyme that degrades heparan sulfate side chains of heparan sulfate proteoglycans, activity that is strongly implicated in tumor metastasis. Apart of its well characterized enzymatic activity, heparanase was noted to exert also enzymatic-independent functions. Among these is the induction of Akt/PKB phosphorylation noted in endothelial- and tumor-derived cells. Protein domains of heparanase required for signaling were not identified to date, nor were identified heparanase binding proteins/receptors capable of transmitting heparanase signals. Here, we examined the possible function of mannose 6-phosphate receptor (MPR) and low-density lipoprotein-receptor related protein (LRP), recently implicated in cellular uptake of heparanase, as heparanase receptors mediating Akt phosphorylation. We found that heparanase addition to MPR- and LRP-deficient fibroblasts elicited Akt activation indistinguishable from control fibroblasts. In contrast, disruption of lipid rafts abrogated Akt/PKB phosphorylation following heparanase addition. These results suggest that lipid raft-resident receptor mediates heparanase signaling.lld:pubmed
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pubmed-article:17689495pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:17689495pubmed:articleTitleHeparanase induces Akt phosphorylation via a lipid raft receptor.lld:pubmed
pubmed-article:17689495pubmed:affiliationCancer and Vascular Biology Research Center, Bruce Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel.lld:pubmed
pubmed-article:17689495pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17689495pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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