Interleukin (IL)-6 release and fever induced by a pre-formed pyrogenic factor (PFPF) derived from LPS-stimulated macrophages

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Author(s):	Zampronio‚ AR ; Hoadley‚ ME ; Luheshi‚ G. ; Rothwell‚ NJ ; de Souza‚ G.E.P. ; Hopkins‚ SJ ; others Total Authors: 7
Document type:	Journal article
Source:	EUROPEAN CYTOKINE NETWORK; v. 11, n. 4, p. 589-596, 2000.
Abstract
A novel pre-formed pyrogenic factor (PFPF), released by LPS-stimulated macrophages, has been identified, that induces an indomethacin-resistant fever. Its activity has to date not been found to match that of any described cytokine, In this study we observed that PFPF induced the release of large amounts of IL-6 from rat peritoneal macrophages, A combination of anti-cytokine antibodies and heat treatment excluded IL-1, tumor necrosis factor (TNF)-alpha and lipopolysaccharide (LPS) as being responsible for this effect. PFPF also induced interleukin (IL)-1, IL-6 and TNF-alpha in a subcutaneous air pouch, as well as increasing plasma IL-6, and induced a fever of 0.58 +/- 0.07 degrees C (3 hours) that was not reduced by indomethacin (2 mg/kg, ip), Preparative isoelectric focusing (IEF) showed that the material responsible for inducing IL-6 release had a pi between 4.7 and 5.8 and corresponded to the IEF pool that induced fever when injected intracerebroventricularly. (AU)

FAPESP's process:	97/09837-6 - Mechanisms and mediators involved in the integration of fever and inflammatory responses
Grantee:	Glória Emília Petto de Souza
Support Opportunities:	Research Projects - Thematic Grants