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- W2188308003 abstract "The ectodomain shedding of numerous transmembrane proteins by the A Disintegrin And Metalloprotease 17 (ADAM17) governs a variety of physiological and developmental processes. Focusing on murine embryonic fibroblasts (MEFs) of ADAM17wt/wt and ADAM17ex/ex (hypomorphic) mice, we investigated ADAM17-mediated changes in conditioned cell culture supernatants, in membrane preparations and in whole cell lysates using a 2D-DiGE proteomic approach. The detection of high amounts of cleaved TNFα in supernatants of TNFα-overexpressing wild-type but not ADAM17ex/ex MEF cells demonstrated the general suitability of the employed 2D-DiGE approach for the identification of shed protein fragments. Interestingly, the analyses of whole-cell lysates revealed that ADAM17 might also influence intracellular protein levels since a variety of proteins (e.g. annexins) showed altered abundances at reduced levels of ADAM17. From conditioned MEF supernatants, seventy differentially abundant secreted and cell-surface proteins were identified. These included collagens and other extracellular matrix components, several proteases and several protein fragments. Thus, wild-type and ADAM17ex/ex MEF cells clearly differ in their ability to secrete or shed proteins. However, only fourteen different protein fragments showed altered abundances in ADAM17ex/ex MEF cell supernatants, including only two known ADAM17 substrates (TNFα and NCAM-1). Notably, most full length proteins that were detected as fragments lack a transmembrane region and are thus no bona fide ADAM17 substrates. The high amounts of the perlecan LG3 peptide and of the type-I collagen C-terminal propeptide in supernatants of wild-type MEF cells point to a reduced collagen maturation and degradation in ADAM17ex/ex MEF cells. Since we also observed reduced levels of the C-procollagenase “bone morphogenic protein 1” and reduced matrix metalloproteinase activity in ADAM17ex/ex MEF cell culture supernatants, the observed processing of collagen and perlecan might reflect “proteolytic side effects” by other proteases in a complex “protease web”." @default.
- W2188308003 created "2016-06-24" @default.
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- W2188308003 date "2014-10-02" @default.
- W2188308003 modified "2023-09-26" @default.
- W2188308003 title "Proteome analyses for the characterization of the ADAM17ex/ex hypomorphic mouse model" @default.
- W2188308003 hasPublicationYear "2014" @default.
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