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M9550126.TXT
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1995-03-04
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Document 0126
DOCN M9550126
TI Role of IL-2 and IL-4 in exacerbations of murine antigen-induced
arthritis.
DT 9505
AU Jacobs MJ; van den Hoek AE; van Lent PL; van de Loo FA; van de Putte LB;
van den Berg WB; Department of Rheumatology, University Hospital
Nijmegen, The; Netherlands.
SO Immunology. 1994 Nov;83(3):390-6. Unique Identifier : AIDSLINE
MED/95137667
AB In this study the roles of different T-cell subsets, and produced
cytokines, were investigated in an animal model for acute exacerbations.
Flare-up reactions are inducible in the chronic phase of a smouldering
antigen-induced inflammation by injection of a small amount of an
antigen into a hyper-reactive knee joint. In vivo treatment with
anti-CD4 monoclonal antibodies (mAb) almost totally blocked the flare
reaction, whereas anti-CD8 treatment did not exert any effect. The role
of T-helper 1 (Th1) cells in delayed-type hypersensitivity-resembling
diseases is generally entitled proinflammatory, whereas Th2 cells act in
an anti-inflammatory manner. To investigate the role of these T-cell
subsets in flare-up reactions, anti-interleukin-2 (IL-2) and anti-IL-4
mAb treatments were performed. Anti-IL-2 treatment partly blocked the
flare reaction, and anti-IL-4 treatment, although the result was
unexpected, blocked the flare more efficiently. Furthermore, when human
recombinant IL-2 (hrIL-2) and murine recombinant IL-4 (mrIL-4) were
co-injected with the antigen to test their ability respectively to
potentiate or down-regulate the flare reaction, both cytokines
demonstrated additional pro-inflammatory effects, although hrIL-2 was
more potent than mrIL-4. The mere effect of hrIL-2 and mrIL-4 was
studied by direct injection into a hyperreactive joint. No flare-up
reaction or cell-influx could be induced, suggesting that other
mediators are needed to exert pro-inflammatory effects of IL-2 or IL-4.
We conclude that not only Th1 cells, but also Th2 lymphocytes (at least
regarding IL-4 production) may play a pro-inflammatory role in flare-up
reactions of chronic arthritis. Considering therapeutic application of
Th2 cell-derived cytokines, one should be aware of the possible
pro-inflammatory potential of IL-4.
DE Acute Disease Animal Antibodies, Monoclonal/ADMINISTRATION & DOSAGE
Arthritis/*IMMUNOLOGY Female Immunization Interleukin-2/PHYSIOLOGY
Interleukin-4/PHYSIOLOGY Interleukins/*PHYSIOLOGY Mice Mice, Inbred
C57BL Support, Non-U.S. Gov't T-Lymphocytes,
Helper-Inducer/*IMMUNOLOGY Th1 Cells/IMMUNOLOGY Th2 Cells/IMMUNOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).