Pathways of mononuclear cell infiltration in rheumatoid synovitis.

Rheumatology International
M Ziff

Abstract

The mononuclear cell infiltration which characterizes the chronic inflammatory reaction results from the migration of lymphocytes and monocytes through the endothelium of the postcapillary venule. The initial step in the emigration of these cells in their binding to the vascular endothelium. The binding capacity of the endothelial cell (EC) for lymphocytes and monocytes is increased by IFN-gamma, IL-1, TNF alpha, and TNF beta. Production of these cytokines by chronic inflammatory cells may be expected to amplify the chronic inflammatory reaction. Initiation of the chronic synovitis of rheumatoid and other chronic synovitides probably results from the interaction of antigen with sensitized T cells in the sublining region of the synovium. This interaction is facilitated by the presence of substantial numbers of DR + macrophage + accessory cells in the synovial interstitial space. It is likely that these accessory cells are bone marrow derived monocytes migrating to the synovial lining layer in response to chemotactic factors released by the hyperplastic synovial lining cells. Lymphocytes differ in their binding affinity for ECs, and more strongly binding lymphocytes may be preferentially bound. Since binding is the first step in ...Continue Reading

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