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- W2073071344 abstract "PN-E2 is a monoclonal antibody generated against recombinant tumor necrosis factor-alpha (TNF-alpha)-treated human umbilical vein endothelial cells (EC). PN-E2 recognized a molecule with expression levels in vitro that could be downregulated by TNF, and in situ PN-E2 showed only weak reactivity with vascular EC in normal skin, as assessed by immunohistochemical staining. The expression of PN-E2 was considerably increased on EC in various pathologic skin lesions, including psoriasis, granulation tissue, and inflamed skin. PN-E2 antigen expression was analyzed in more detail in vitro on cultured EC and fibroblasts by use of enzyme-linked immunosorbent assay and fluorescence-activated cell sorter techniques. The expression level on human umbilical vein endothelial cells and capillary EC was, in contrast to the in situ immunohistologic findings, invariably high. On fibroblasts, a low expression was found. Incubation of the EC with recombinant TNF-alpha decreased expression by a factor of 2. Incubation of EC with recombinant interferon-gamma resulted in a twofold increase in PN-E2 antigen expression, whereas other cytokines [recombinant interleukin (rIL)-1 alpha, rIL-1 beta, rIL-4, rIL-6], lipopolysaccharide, or recombinant basic fibroblast growth factor had no effect. Immunoelectron microscopy of tissue specimens and EC preparations localized the antigen on the luminal membrane of the endothelium. Immunoprecipitation followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis revealed a major band at 90 kDa and a minor band at 80 kDa under reducing conditions and bands of 180 and 400 kDa under non-reducing conditions. Molecular weight and expression patterns in vitro on EC after incubation with cytokines excluded most of the known endothelium-specific molecules, with the possible exception of endoglin (the 44G4 antigen). We conclude from our findings that this new antigen could be useful as a marker for endothelial activation in skin biopsy material." @default.
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- W2073071344 date "1993-01-01" @default.
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- W2073071344 title "A New 180-kDa Dermal Endothelial Cell Activation Antigen: In Vitro and In Situ Characteristics" @default.
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- W2073071344 doi "https://doi.org/10.1111/1523-1747.ep12349946" @default.
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