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[Isolation of FDC-lymphocyte clusters from human tonsillar tissues]
1Department of Otolaryngology, Tokyo Women's Medical University, Tokyo.
Nihon Jibiinkoka Gakkai Kaiho
|February 24, 2001
Summary
Researchers developed a method to isolate follicular dendritic cell (FDC)-lymphocyte clusters from fixed tonsil tissue. These clusters, crucial for humoral immunity, showed distinct cellular compositions across different lymphoid follicle zones.
Area of Science:
- Immunology
- Cell Biology
- Histology
Context:
- Follicular B cells and follicular dendritic cells (FDCs) form clusters within lymphoid follicles (LFs), playing a key role in humoral immunity.
- Secondary LFs are functionally zoned, but the distribution of FDC-lymphocyte clusters across these zones is not well understood.
Purpose:
- To establish a procedure for isolating FDC-lymphocyte clusters from fixed tonsillar tissues.
- To compare the cellular structure of FDC-lymphocyte clusters from the mantle, light, and dark zones of lymphoid follicles.
Summary:
- A method was developed to isolate FDC-lymphocyte clusters from fixed tonsillar tissues using enzymatic digestion, density gradient, and magnetic separation.
- The optimal incubation time for isolating medium-sized clusters (6-25 cells) was determined to be 40 minutes.
- Immunostaining revealed that clusters are primarily composed of B cells (approx. 80%), with varying proportions of T cells, NK/T cells, and macrophages across the mantle, light, and dark zones.
- CD45 RO-positive and CD4-positive cell proportions differed significantly between zones, with CD4-positive cells being predominant.
Impact:
- The described procedure is effective for isolating FDC-lymphocyte clusters from fixed lymphoid tissues.
- The study reveals distinct cellular compositions of FDC-lymphocyte clusters in different lymphoid follicle zones, providing insights into localized immune responses.