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Lymphocyte subpopulations in middle ear effusions: flow cytometry analysis
Bozena Skotnicka1, Anna Stasiak-Barmuta, Elizbieta Hassmann-Poznanska
1Department of Pediatric Otolaryngology, Medical University, Białystok, Poland. pedorl@amb.edu.pl
Insights
This study found that lymphocyte populations in middle ear effusions of children with otitis media show local immune responses. T cells, particularly helper T cells, dominate these effusions.
Area of Science:
- Immunology
- Otolaryngology
- Pediatrics
Background:
- Otitis media with effusion (OME) is common in children.
- Understanding the immune response in OME is crucial for effective treatment.
Purpose of the Study:
- To identify and quantify lymphocyte subpopulations in middle ear effusions (MEE), peripheral blood, and adenoids of children with OME.
- To compare these lymphocyte profiles between different sample sites.
Main Methods:
- Flow cytometry was used to analyze CD3, CD4, CD8, CD19, and natural killer cell populations.
- Samples were collected from 33 children undergoing myringotomy for OME.
- Quantitative estimation was performed on middle ear effusion, peripheral blood, and adenoid tissues.
Main Results:
- T cells (CD3), predominantly helper T cells (CD4), were the main lymphocytes in MEE.
- CD4 and CD8 cell percentages and the CD4/CD8 ratio were significantly higher in MEE compared to blood.
- Memory CD4 and naive CD8 lymphocytes were less prevalent in MEE than in blood.
Conclusions:
- Lymphocyte profiles in MEE suggest a localized immune response.
- The immune response in both ears of the same patient appears to be in a similar phase.
Objective:
The aim of this study was to identify lymphocyte subpopulations in middle ear effusions, peripheral blood, and adenoids in children suffering from otitis media with effusion.
Setting:
Tertiary referral center.
Patients:
Thirty-three children (55 ears) undergoing myringotomy for otitis media with effusion.
Methods:
CD3, CD4, CD8, CD19, and natural killer cell populations were investigated in middle ear effusion, peripheral blood, and adenoids using a three-color monoclonal antibody and flow cytometry method for quantitative estimation.
Results:
T cells (CD3) are dominating lymphocytes in middle ear effusion. Among T lymphocytes, the majority are those of the helper type (CD4). The dominating isoform among CD4 lymphocytes are memory cells (CD4CD45RO); among CD8 lymphocytes, naive cells (CD8CD45RA). The percentage of CD4 cells, CD8 cells, and the CD4/CD8 ratio was significantly higher in middle ear effusions than in blood. The percentage of memory CD4 lymphocytes and naive CD8 lymphocytes was significantly lower in the middle ear effusion. Lymphocyte subsets were compared between 22 pairs of effusions from each patient. The percentage of each type of cell did not differ significantly.
Conclusion:
The results of this study indicate local regulation of the lymphocyte profile in middle ear effusions and the same phase of immune response in two ears of the same patient.
