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• W2033748051 abstract "Tumor necrosis factor alpha (TNF alpha) production by proximal tubuli was studied by immunoperoxidase staining of 20 renal biopsies from transplant patients. A positive staining for TNF alpha on proximal tubuli was seen in nine out of 15 patients with interstitial infiltrate, five without clinical significant rejection and four with moderate to severe interstitial rejection. TNF alpha was only expressed on tubuli within areas of interstitial infiltrate. Expression of TNF alpha in the mononuclear cell infiltrate was seen only in three patients with interstitial rejection. Absence of TNF alpha could be seen in biopsies with no renal abnormalities. To obtain more information on the regulation of TNF alpha production, proximal tubular epithelial cells (PTEC) cultures were established and assessed for production of TNF alpha. Heterogenicity in production of TNF alpha was found in 14 tested PTEC lines cultured under serum free conditions. The presence of IL-1 alpha in the cultures induced a time- and dose-dependent enhancement of TNF alpha production by PTEC. Enhanced production of TNF alpha was not seen after stimulation with other cytokines such as IL-2 or IFN gamma. Inhibition studies with cycloheximide indicated de novo synthesis of TNF alpha. Western blot analysis of supernatants of unstimulated and IL-1 alpha stimulated PTEC indicated a 17 kd product, a size similar to that of recombinant TNF alpha. Northern blot analysis revealed the presence of a 2.0 kb hybridization signal in total RNA of PTEC cultures and up regulation upon treatment of PTEC with 1 ng/ml of IL-1 alpha.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2033748051 date "1992-08-01" @default.
• W2033748051 modified "2023-09-27" @default.
• W2033748051 title "IL-1α stimulated TNFα production by cultured human proximal tubular epithelial cells" @default.
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• W2033748051 doi "https://doi.org/10.1038/ki.1992.299" @default.
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