High levels of neutralizing IL-6 autoantibodies in 0.1% of apparently healthy blood donors.

Abstract:

:IL-6-specific autoantibodies (aAb-IL-6) have been reported in diseased and healthy individuals. We recently established a model for aAb-IL-6 in different mouse strains, based on vaccination with immunogenic IL-6 analogues, in which titers of aAb-IL-6 above 1,000 resulted in an in vivo IL-6 deficiency. Here, we examined aAb-IL-6 in 4,230 blood donors. Stable low titers of aAb-IL-6 were found in 9% of the donors, while 1% had titers ranging from 64 to greater than 10,000. Such aAb-IL-6-positive donors appeared normal with no overt signs of pathology. Natural and recombinant forms of IL-6 bound avidly to their IgG, and their plasma strongly neutralized IL-6 in vitro. Slightly elevated concentrations of IL-6 exclusively in the form of IL-6-IgG complexes were present in their circulation. The complexes did not contain soluble IL-6 receptors. Titers of 0.1% of the blood donors were as positive as the vaccination-induced IL-6-deficient mice. Such donors might be IL-6 deficient, and if so, IL-6 seems be dispensable for several months in otherwise healthy individuals. Such highly positive donors also explain why normal human IgG for pharmaceutical use may contain high anti-IL-6 activity. Finally, transfusion of plasma with a high titer of aAb-IL-6 might, temporally, render a recipient IL-6 deficient.

journal_name

Eur J Immunol

authors

Galle P,Svenson M,Bendtzen K,Hansen MB

doi

10.1002/eji.200425268

keywords:

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

3267-75

issue

11

eissn

0014-2980

issn

1521-4141

journal_volume

34

pub_type

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