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Interdigitating reticulum cells in dermatopathic lymphadenitis: freeze-fracture and ultrathin-section morphology

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Virchows Archiv B

Summary

Dermatopathic lymphadenitis is a non-neoplastic lesion found with various chronic skin lesions and associated with hyperplasia of the thymus-dependent (T) areas. These areas consist chiefly of interdigitating reticulum cells (IDC’s), which are known to be accessory cells for T-cell-dependent immune reactions. The most characteristic features of IDC’s are the bizarre-shaped cell nucleus, numerous cytoplasmic processes, deep cytoplasmic invaginations, and a close topographical relationship to surrounding (T) lymphocytes. The cytoplasmic processes of IDC’s do not interdigitate with adjacent lymphocytes, as previously reported in the literature, but show close interdigitations with the processes of neighboring IDC’s. With the freeze-fracture technique it can be seen that IDC’s exhibit a characteristic distribution of intramembranous particles (IMP). While, for example, macrophages, epithelioid cells and lymphocytes display a clearly greater number of IMP on the P face than on the E face, IDC’s show an equally high particle density on both the P face and the E face. The organelle content of IDC’s in dermatopathic lymphadenitis varies considerably. Tubular profiles, the Golgi apparatus and vesicles may be increased in number. Birbeck granules are also found in IDC’s, but only rarely. Variations in the numbers of the different cytoplasmic organelles may be a reflection of varying degrees of metabolic activity of IDC’s.

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  1. Institute of Pathology, Eberhard-Karls University, Liebermeisterstraße 8, D-7400, Tübingen, Federal Republic of Germany

    E. Kaiserling & H. Wolburg

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  1. E. Kaiserling
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  2. H. Wolburg
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Kaiserling, E., Wolburg, H. Interdigitating reticulum cells in dermatopathic lymphadenitis: freeze-fracture and ultrathin-section morphology. Virchows Archiv B Cell Pathol 55, 19–30 (1988). https://doi.org/10.1007/BF02896556

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  • DOI: https://doi.org/10.1007/BF02896556

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