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Published on: October 21, 2013
Systemic macrophage activation in locally-induced experimental arthritis
J Simon1, R Surber, G Kleinstäuber
1Institute of Pathology, Friedrich Schiller University, Jena, Germany.
Journal of Autoimmunity
|October 10, 2001
Summary
This study investigated macrophage activation in antigen-induced arthritis (AIA). Both local and systemic immune responses were observed, with specific cytokines and nitric oxide levels changing during arthritis development and resolution.
Area of Science:
- Immunology
- Rheumatology
- Cell Biology
Background:
- Macrophage activation is crucial in inflammatory arthritis.
- Antigen-induced arthritis (AIA) models offer insights into disease pathogenesis.
- Understanding local vs. systemic immune responses is key.
Purpose of the Study:
- To examine local and systemic macrophage activation during murine antigen-induced arthritis (AIA).
- To quantify cytokine and nitric oxide levels in joints, sera, and macrophages.
- To differentiate immune responses following systemic immunization and local induction.
Main Methods:
- Monoarticular AIA induced in mice via systemic immunization and local challenge.
- Measurement of TNF-alpha, IL-1beta, IL-6, IL-12p70, and nitric oxide (NO).
- Analysis of samples from joints, sera, and ex vivo stimulated/unstimulated peritoneal macrophages.
Main Results:
- Systemic immunization increased serum TNF-alpha, joint IL-1beta, and macrophage IL-6/IL-12p70.
- Local induction further elevated joint and serum cytokines (TNF-alpha, IL-1beta, IL-6) and macrophage IL-1beta/IL-6.
- Macrophage NO and IL-12p70 increased during acute AIA; IL-1beta remained elevated in joints chronically.
Conclusions:
- Murine AIA involves both local and systemic mononuclear phagocyte system (MPS) activation.
- Systemic MPS activation precedes arthritis and is an integral part of AIA pathogenesis.
- The AIA model highlights the interplay between systemic priming and local inflammatory triggers.
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