Title: Nodular alteration of the paracortical area. An in situ immunohistochemical analysis of primary, secondary, and tertiary T-nodules
Authors: van den Oord, Joost ×
De Wolf-Peeters, C
Desmet, V J
Takahashi, K
Ohtsuki, Y
Akagi, T #
Issue Date: Jul-1985
Series Title: The American journal of pathology vol:120 issue:1 pages:55-66
Abstract: With the use of in situ immunohistochemical techniques on freshly frozen and paraffin-embedded material from 63 reactive lymph nodes, the cellular composition of T-nodules observed in 30 cases with nodular alteration of the paracortical area was analyzed. T-nodules were composed of S-100 beta + interdigitating reticulum cells (IDRCs), variable numbers of OKT6+ dendritic cells (DCs), high endothelial venules, and a very high T helper/T suppressor ratio because of an enrichment of OKT4+, Leu3a+ helper/inducer T cells in these nodules. According to their localization in the paracortical area, and the arrangement of IDRCs and high endothelial venules, T-nodules could be divided into "primary" and "secondary" T nodules. In all cases of dermatopathic lymphadenitis, very large aggregates of S-100 beta + and OKT6+ DCs, admixed with few high endothelial venules and variable numbers of OKT4+, Leu3a+ helper/inducer T cells, were observed and were termed "tertiary T-nodules." It is suggested that T-nodules represent the paracortical counterparts of B-lymphoid follicles and are the in vivo equivalents of DC/T-cell clusters observed in vitro. According to their cellular composition and localization in the lymph node, "primary" and "secondary" T-nodules probably represent subsequent maturation stages of distinctive nodular paracortical structures, which play an important role in the presentation of antigens to helper/inducer T cells and in the proliferation of antigen-responsive T cells. Their close topographic relationship to B-lymphoid follicles may indicate their role in the extrafollicular generation of antibody-forming cells.
ISSN: 0002-9440
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Translational Cell & Tissue Research
× corresponding author
# (joint) last author

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