Summary
Highly purified follicular dendritic cells (FDC) were isolated from human tonsils and cultivated for up to 150 days. The cell separation method employed produced pure aggregates (FDC-clusters) composed of FDC and germinal center lymphoid cells, useful for the analysis of the relationship between these two cell types and of the behavior of FDC in culture. During the first few days of culture, lymphoid cells located between FDC extensions survived better than those which were free or partly covered by FDC. After 6 days, the lymphoid population degenerated and only the FDC survived. The unique antigenic pattern of FDC (positive for HLA-DR, DRC-1, CD14b, CD21, CD23, CD35) disappeared within a few days of culture. Recombinant interferon-γ ex-erted a positive effect either on retaining HLA-DR expression or on the reexpression of these antigens by FDC. HLA-ABC antigens were traced until the 10th day and desmosomal junctions until the 14th day. Subsequently, FDC presented peculiar features, including oval and rhomboid shapes, one to ten nuclei, fine amoeboid extensions, stress fibers and a radical dense zone in their cytoplasm. FDC possessed actin, tubulin and vimentin, but neither desmin nor cytokeratin. After 40 days of culture, FDC enlarged and were covered with abundant membrane extensions. Even when kept as long as 150 days in vitro, FDC did not proliferate in any of the culture conditions employed.
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Tsunoda, R., Nakayama, M., Onozaki, K. et al. Isolation and long-term cultivation of human tonsil follicular dendritic cells. Virchows Archiv B Cell Pathol 59, 95–105 (1990). https://doi.org/10.1007/BF02899393
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DOI: https://doi.org/10.1007/BF02899393