Relationships between HLA‐DR‐expressing Cells and T Lymphocytes of Different Subsets in Rheumatoid Synovial Tissue

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Abstract
An immunohistochemical double staining technique was used to study the relationships between HLA-DR-expressing, mostly macrophage-like cells, and different populations of T lymphocytes in frozen sections of synovial tissue from patients with Inflammatory joint disease, particularly rheumatoid arthritis. Substantial T-lymphocyte infiltration as measured by Leu I antibody binding was found, especially adjacent to HLA-DR-expressing cells near the synovial cavity and around small vessels. Most of the T cells reacted with Leu 3a ('helper/inducer'-cell-specific) antibodies, whereas relatively few cells were Leu 2a (cytotoxic/suppressor’ T-cell-specific)-positive.