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[Neutrophil granulocytes in rheumatic tissue destruction]
Abstract:
Periarticular rheumatoid nodules from 27 patients with rheumatoid arthritis were investigated with a histochemical method to identify polymorphonuclear granulocytes (PMN's). In all necrotic areas PMN's were present, however, in different densities. Most of the necrotic areas contained a minimal or intermediate infiltration with these inflammatory cells. Six rheumatoid nodules exhibited a severe vasculitis with dense perivascular infiltrations of PMN's. This vasculitis was preferentially seen in nodules with necrosis densely infiltrated with PMN's. From the present results it is assumed that PMN's may be involved in the pathogenesis of fibrinoid necrosis in rheumatoid nodules.
Insights
Polymorphonuclear granulocytes (PMNs) are present in rheumatoid nodule necrosis. These inflammatory cells may play a role in the development of fibrinoid necrosis in rheumatoid arthritis nodules.
Area of Science:
- Rheumatology
- Pathology
- Immunology
Context:
- Rheumatoid nodules are common in rheumatoid arthritis.
- The pathogenesis of rheumatoid nodule necrosis is not fully understood.
- Polymorphonuclear granulocytes (PMNs) are key inflammatory cells.
Purpose:
- To investigate the presence and density of PMNs in rheumatoid nodule necrotic areas.
- To determine the relationship between PMN infiltration and vasculitis in rheumatoid nodules.
Summary:
- Histochemical analysis of 27 rheumatoid arthritis patients' nodules revealed PMNs in all necrotic areas, with varying densities.
- Severe vasculitis was observed in six nodules, correlating with dense PMN infiltration.
- PMNs are implicated in the pathogenesis of fibrinoid necrosis within rheumatoid nodules.
Impact:
- Provides insights into the cellular mechanisms driving rheumatoid nodule formation.
- Suggests a potential therapeutic target for managing rheumatoid arthritis complications.
- Enhances understanding of inflammatory processes in autoimmune diseases.