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. 1984 Jun;56(3):683–693.

The role of MHC class II antigenic determinants in the function of human antigen binding T8+ cells, monocytes and helper and suppressor factors.

T Lehner, T Jones
PMCID: PMC1536012  PMID: 6204796

Abstract

The role of MHC class II antigens was investigated in the process of antigen binding by T8+ cells and monocytes (Mo) and in the functions of helper factor (HF) and suppressor factor (SF). Monoclonal antibodies (MoAbs) to HLA-DR, DC and SB determinants were used in immunofluorescence, inhibition of antigen binding and affinity chromatography of HF and SF. Indirect immunofluorescence studies suggest that T lymphocytes from peripheral blood of healthy subjects have a small proportion of cells expressing HLA-DR, beta chain determinants (1.4-3.8%). These belong predominantly to the T8+ subset of cells (4.6-8.8%), with only a very small proportion in the T4+ cells (0.1-1.8%). However, DC1 on DRw6+ T cells and SB2,3 on any HLA typed cells were found in significantly greater proportion than the DR antigens in both T8+ and T4+ cells, though this was again greater on T8+ (30 and 25%) than T4+ (8.3 and 14.4%) cells. Although Mo had a greatly increased proportion of cells with DR-beta chain determinants (27-45%) than the T8+ cells, the converse was found with DC1 and SB2,3 determinants (13.9 and 11.4%). Inhibition of 125I-streptococcal antigen (SA) binding to T8+ cells and to Mo by MoAbs to the class II antigens showed that DR-beta chain monomorphic or polymorphic antibodies and DC1 antibodies inhibited binding to both cell types by 66-94%. However, MoAbs to DR-alpha chains or to the SB2,3 determinant failed to yield significant inhibition. Affinity chromatography studies of HF and SF revealed that the DR-beta chain monomorphic and DC1 antibodies bound HF and SF activities and that this was not found with the DR-beta chain polymorphic or SB2,3 antibodies. The results of inhibition of 125I-SA binding to T8+ cells and Mo, and absorption of HF and SF by affinity chromatography with MoAbs suggest four categories of recognition of human MHC class II antigenic determinants. (1) Class II determinants shared by the T8+ cells, Mo, HF and SF and recognized by MoAbs to monomorphic beta chains (DA6.231) and to DC1. (2) Class II determinants shared only by the SA binding T8+ cells and Mo and recognized by the MoAbs to a polymorphic beta chain (DA6.164) and to a monomorphic DR determinant (OK.Ial). (3) Class II determinants shared only by the HF and SF and recognized by the MoAbs to one of the alpha chains (TAL.1B5). (4) Class II determinants not detected on the two cells or the two T cell factors.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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