Purification and biologic characterization of a specific tumor necrosis factor alpha inhibitor - PubMed (original) (raw)
. 1989 Jul 15;264(20):11966-73.
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- PMID: 2545692
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Purification and biologic characterization of a specific tumor necrosis factor alpha inhibitor
P Seckinger et al. J Biol Chem. 1989.
Free article
Abstract
The purpose of the present investigation was to purify a urine-derived tumor necrosis factor alpha inhibitor (TNF alpha INH) and to characterize its mechanism of action. For the purification procedure, urine was concentrated and TNF alpha INH purified by ion-exchange chromatographies, gel filtration, TNF alpha affinity column, and reverse-phase chromatography. The TNF alpha INH migrates with an apparent Mr of approximately 33,000 when estimated on sodium dodecyl sulfate-polyacrylamide gel electrophoresis run under both reducing and nonreducing conditions. Elution of TNF alpha INH activity from the gel yields also a approximately 33,000-Da inhibitory fraction. Besides inhibiting TNF alpha-induced cytotoxicity in L929 cells in the presence of actinomycin D, the TNF alpha INH impeded in a dose-dependent manner prostaglandin E2 production and expression of cell-associated interleukin-1 by human dermal fibroblasts. Therefore, TNF alpha INH is active on both actinomycin D-treated and untreated cells. In contrast to TNF alpha, TNF beta-induced cytotoxicity was only slightly affected by the inhibitor. This specificity was confirmed by the fact that it affected neither interleukin-1 alpha nor interleukin-1 beta biologic activities. The mechanism of action of TNF alpha INH involves blocking of 125I-TNF alpha binding to the promonocytic cell line U937. Moreover, preincubation of 125I-TNF alpha with TNF alpha INH increased binding inhibition, suggesting an interaction between TNF alpha and the inhibitor.
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