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[The role and expression of CD27/CD70 in tonsil]
1Department of Otorhinolaryngology, Juntendo University, School of Medicine, Tokyo.
Nihon Jibiinkoka Gakkai Kaiho
|February 20, 1999
Summary
This study investigated CD27 and CD70 in chronic tonsillitis, finding they are crucial for T-B cell interactions and antibody production. Increased CD27- CD4+ memory cells in tonsils suggest ongoing immune responses.
Area of Science:
- Immunology
- Cell Biology
Background:
- Chronic tonsillitis involves complex immune cell interactions within tonsillar tissues.
- CD27 and CD70 are known co-stimulatory molecules implicated in T-cell and B-cell responses.
Purpose of the Study:
- To investigate the expression and function of CD27 and CD70 in tonsillar lymphocytes from patients with chronic tonsillitis.
- To compare these molecules in tonsillar versus peripheral lymphocytes and their role in T-B cell interactions and antibody production.
Main Methods:
- Comparative analysis of CD27 and CD70 expression in tonsillar and peripheral lymphocytes.
- Assessment of T-B cell interactions and antibody production.
- Flow cytometry to identify and quantify CD4+ T-cell subsets (CD27+ and CD27-).
- Investigation of CD27 and CD70 localization within tonsillar tissue.
Main Results:
- CD27 and CD70 were confirmed to be involved in T/T, T/B, and B/B cell interactions within the tonsil.
- While peripheral lymphocyte levels showed no significant difference, tonsillar lymphocytes exhibited an increase in CD27- CD4+ cells.
- This increase in CD27- CD4+ cells suggests recurrent antigenic stimulation and the presence of memory T-cells in tonsillar lymphocytes.
Conclusions:
- CD27 and CD70 play a significant role in the immune response within the tonsils of patients with chronic tonsillitis.
- The observed increase in CD27- CD4+ cells indicates a memory cell population actively responding to persistent antigenic stimuli in the tonsils.
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