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- W2011832904 abstract "Neutrophil elastase (NE) is a neutrophil-derived serine proteinase with broad substrate specificity. We have recently demonstrated that NE is capable of entering tumor cell endosomes and processing novel intracellular substrates. In the current study, we sought to determine the mechanism by which NE enters tumor cells. Our results show that NE enters into early endosomal antigen-1(+) endosomes in a dynamin- and clathrin-dependent but flotillin-1- and caveolin-1-independent fashion. Cathepsin G (but not proteinase-3) also enters tumor endosomes via the same mechanism. We utilized (125)I-labeled NE to demonstrate that NE binds to the surface of cancer cells. Incubation of radiolabeled NE with lung cancer cells displays a dissociation constant (K(d)) of 284 nm. Because NE is known to bind to heparan sulfate- and chondroitin sulfate-containing proteoglycans, we treated cells with glycanases to remove these confounding factors, which did not significantly diminish cell surface binding or endosomal entry. Thus, NE and CG bind to the surface of cancer cells, presumably to a cell surface receptor, and subsequently undergo clathrin pit-mediated endocytosis." @default.
- W2011832904 created "2016-06-24" @default.
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- W2011832904 date "2012-10-01" @default.
- W2011832904 modified "2023-10-11" @default.
- W2011832904 title "Clathrin Pit-mediated Endocytosis of Neutrophil Elastase and Cathepsin G by Cancer Cells" @default.
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- W2011832904 doi "https://doi.org/10.1074/jbc.m112.385617" @default.
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