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[Cytostructure of the mantle zone in lymphatic tissue]
1Hlavův I. patologicko-anatomický ústav 1. LF UK, Praha.
Insights
The palatine tonsil
Area of Science:
- Immunology and cell biology.
- Histology of lymphatic tissues.
Context:
- The follicular mantle zone in palatine tonsils plays a crucial role in immune responses.
- Understanding the cellular composition and differentiation within this zone is key to deciphering local immune mechanisms.
Purpose:
- To investigate the distinct cellular layers within the palatine tonsil's follicular mantle zone.
- To elucidate the immunophenotypic characteristics and potential functional roles of these cellular layers using electron microscopy.
Summary:
- Electron microscopy and immunophenotyping revealed four distinct cellular layers in the palatine tonsil follicular mantle zone.
- The study identified a unique B monocytoid layer and described transitional forms suggesting local differentiation from B monocytoid cells.
- Outer mantle layers exhibit characteristics of aggressive immune cells, potentially involving both B and T cell components in tissue defense.
Impact:
- Provides novel insights into the heterogeneity and potential functional specialization of cells within the tonsillar follicular mantle zone.
- Suggests a local origin for certain cell types, challenging previous assumptions about lymphocyte origins and differentiation.
- Highlights the potential involvement of the follicular mantle zone in both adaptive and innate-like immune responses at mucosal surfaces.
Abstract:
Four cellular layers of the follicular mantle zone in palatine tonsil lymphatic tissue were studied by electron microscopy after simultaneous immunophenotypical investigation. The first layer of the mantle zone consisting of small blastic cells was analogous to the small (centrocytoid) blastic layer of germinal centres. The second B monocytoid layer was lacking analogy in basic series of lymphocytes and seemed to be an independent morphological and probably functional unit. Plasmacytoid and clarocellular elements in outer layers of follicular mantle zone were in a way similar to T plasmacytoid and clarocellular components of Sézary syndrome infiltrates but considering transitional forms they had a local origin from incompletely transformed elements of B monocytoid layer. Inner follicular mantle zone was discussed as a source of incompletely transformed B lymphocytes for further mantle layers where their immunophenotypical modulation is taking place according to actual need. Outer mantle layers are aggressive against damaged epithelial and litoral structures and may be instrumental in a common reaction of B and T components.