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Production of interleukin 1 by human endothelial cells.

P Miossec, D Cavender and M Ziff
J Immunol April 1, 1986, 136 (7) 2486-2491;
P Miossec
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D Cavender
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M Ziff
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Abstract

Vascular endothelial cells (EC) play an important role in the emigration from the blood of the mononuclear cells that participate in the chronic inflammatory response. Because EC express a number of functions of cells of the monocyte/macrophage lineage, EC culture supernatants (ECSN) were examined for the presence of IL 1. In these supernatants, IL 1 activity was low when EC were cultured in the presence of serum. The low level of activity appeared to be due to the spontaneous production by the EC of inhibitors of the thymocyte proliferation assay of IL 1, of 70 kd and 9 kd, as measured by AcA Ultrogel filtration. When EC were cultured in the absence of serum, IL 1 activity was easily demonstrated in crude supernatants. Upon stimulation with LPS, the amounts of IL 1 activity were greatly increased. The release of IL 1 was an early event, detectable after 1 hr of incubation and reaching a maximum after 24 hr. The IL 1 activity produced by EC demonstrated a number of similarities to that of IL 1 produced by monocytes. On AcA 54 gel filtration, as with monocyte-derived IL 1, the IL 1 activity was found in two peaks of 50 to 60 kd and 16 to 18 kd. Upon chromatofocusing of the 16 to 18 kd peak, three active fractions were found, eluting near pH 7.0, 5.6, and 5.0. In addition, when LPS-stimulated ECSN and purified monocyte-derived IL 1 were incubated with a rabbit anti-IL 1 antibody, a parallel reduction in thymocyte-stimulating activity was observed, suggesting that the active agent in ECSN shared a common antigenic site with IL 1. The demonstration of IL 1 production by EC provides additional evidence that these cells, in addition to their functions as vascular cells, may also participate in some of the immune and nonimmune functions previously ascribed to macrophages.

  • Copyright © 1986 by American Association of Immunologists

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The Journal of Immunology
Vol. 136, Issue 7
1 Apr 1986
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Production of interleukin 1 by human endothelial cells.
P Miossec, D Cavender, M Ziff
The Journal of Immunology April 1, 1986, 136 (7) 2486-2491;

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Production of interleukin 1 by human endothelial cells.
P Miossec, D Cavender, M Ziff
The Journal of Immunology April 1, 1986, 136 (7) 2486-2491;
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