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Lymphocyte functional antigens stabilize agglutination between Reed-Sternberg cells and T cells, but are not responsible for homotypic binding of Hodgkin's Reed-Sternberg cells

Lymphocyte functional antigens stabilize agglutination between Reed-Sternberg cells and T cells, but are not responsible for homotypic binding of Hodgkin's Reed-Sternberg cells

American Journal of Pathology 137(3): 563-574

The neoplastic (Hodgkin's Reed-Sternberg [H-RS]) cells in Hodgkin's disease (HD) are known for their unique capacity to form rosettes with unprimed T cells. Recently, a family of leukocyte-adherence molecules (LFA-1 and LFA-2) has been identified on T lymphocytes. The molecules bind to intercellular-adhesion molecules (ICAMs) and to LFA-3, respectively, which are associated with antigen-presenting cells. In this study, the authors examined whether these molecules are responsible for the homotypic and heterotypic agglutination that occurs in the cultured H-RS cells HDLM-1, HDLM-1d, and KM-H2. Despite their similar expressions of LFA-3 and ICAM-1, the different H-RS cells tested showed different growth patterns in culture. HDLM-1 cells grew singly, whereas HDLM-1d and KM-H2 cells grew in clumps. The HDLM-1 cells formed clumps when mixed with peripheral-blood T lymphocytes, cells of two lymphoblastic T-cell lines (MOLT-3 and MOLT-4), and cells of two monocyte lines (ML-1 and U-937). The addition of anti-LFA and ICAM-1 antibodies to cultures did not result in disassembly of the homotypic clusters of HDLM-1d or KM-H2 cells and it did not cause any significant changes in the size of heterotypic clusters or in the timing of cluster formation of HDLM-1 cells with other types of cells. In all studies, the cell clusters formed during homotypic and heterotypic aggregation were disassembled only minimally by cell shearing with pipetting. The disaggregation by pipetting was slightly more prominent in the presence of antibodies than was that of control cultures. However, in no case did the use of monoclonal antibodies (MAbs) and cell shearing cause complete disaggregation of homotypic and heterotypic clusters. The result seems to suggest that binding between H-RS cells and T cells and between H-RS cells and monocytes is not mediated primarily by LFAs and ICAMs, but that the binding may be strengthened in the presence of these molecules.

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Accession: 040613261

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PMID: 1698024

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