Community Research and Development Information Service - CORDIS

Abstract

The generation of biologically active complement split products through the direct reaction of microorganisms with complement proteins is one of the earliest events of the defence reaction in humans. Complement activation develops within minutes, which highly corresponds with the onset of a febrile reaction after exposure to pyrogens. The possibility of the use of complement activation in human plasma as an indicator of pyrogen contamination has been tested. Additionally, the co-stimulatory effect of complement activation on tumor necrosis factor-alpha (TNF-alpha) production by blood-separated macrophages exposed to lipopolysaccharide (LPS) has been demonstrated. As an indicator of complement activation in test samples, the concentration of the iC3b fragment was measured by using an ELISA system based on neoantigen formation. The 3-h exposure time has been identified as optimal for the test. The variability between iC3b concentrations in untreated control samples obtained from seven unrelated healthy donors was less than 10%, while after activation by 100 ng/ml LPS, it increased to 13%. The lower detection limit has been identified as 10 pg/ml LPS. As the complement test is not affected by drug-cell interactions or cell viability, the test can be used in situations where tested formulations contain active substances, which interfere with a cell-based test. We conclude that a test based on the detection of complement activation in human plasma should be considered as a valuable element of an in vitro pyrogenicity testing battery along with a cell-based assay.

This article is available to subscribers online via the website: http://www.elsevier.nl/locate/toxinvit

Additional information

Authors: SLADOWSKI D, European Commission, Joint Research Centre, Institute for Health & Consumer Protection, ECVAM, Ispra (IT);LANGEZAAL I, European Commission, Joint Research Centre, Institute for Health & Consumer Protection, ECVAM, Ispra (IT);KAY S, European Commission, Joint Research Centre, Institute for Health & Consumer Protection, ECVAM, Ispra (IT);COECKE S, European Commission, Joint Research Centre, Institute for Health & Consumer Protection, ECVAM, Ispra (IT);KINSNER A, Department of Transplantology & Central Tissue Bank, Centre of Biostructure, Medical University of Warsaw (PL)
Bibliographic Reference: An article published in: Toxicology in Vitro, 15 (4-5) (2001) pp. 339-342
Record Number: 200214695 / Last updated on: 2002-05-15
Category: PUBLICATION
Original language: en
Available languages: en