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Natural cellular cytotoxicity in Behçet's disease
M Onder1, M Bozkurt, M A Gürer
1Department of Dermatology, Gazi University School of Medicine, Beşevler, Ankara, Türkiye.
Insights
Natural killer cell activity in Behçet
Area of Science:
- Immunology
- Cellular Biology
- Rheumatology
Background:
- Behçet's disease (BD) is a chronic inflammatory disorder with complex immunopathogenesis.
- Understanding the role of natural killer (NK) cells in different disease stages is crucial for explaining BD's immune mechanisms.
Purpose of the Study:
- To evaluate the cytotoxic activity of natural killer cells in active and inactive Behçet's disease.
- To explore a novel hypothesis for the immunopathogenesis of Behçet's disease based on NK cell function.
Main Methods:
- Blood samples were collected from 16 Behçet's disease patients and 11 healthy controls.
- Lymphocytes were isolated and co-cultured with Candida albicans as target cells at varying effector-to-target ratios (1:5 and 1:25).
- Natural cytotoxicity was quantified by calculating the anticandidal index based on colony counts.
Main Results:
- Natural cytotoxicity was significantly decreased in the active stage of Behçet's disease compared to the inactive stage.
- Natural cytotoxicity in the active stage showed no significant difference compared to healthy controls.
- Natural cytotoxicity was significantly higher in the inactive stage of Behçet's disease compared to healthy controls.
Conclusions:
- Natural killer cell activity exhibits distinct patterns in active versus inactive Behçet's disease.
- Increased natural cytotoxicity during the inactive phase may contribute to the immunopathogenesis of Behçet's disease, potentially alongside other immune factors.
Abstract:
This study evaluated the cytotoxic activity of natural killer cells in the active and inactive stages of Behçet's disease (BD) and attempted to develop a new explanation for its immunopathogenesis. Blood samples were taken from 16 BD patients and compared with 11 healthy individuals. The lymphocyte fraction was separated and diluted in RPMI-1640. Candida as a target cell (T) was mixed with lymphocytes (E) (effector cells) in ratios of T:E 1/5 and T:E 1/25. After the numbers of colonies were counted with controls, the anticandidal index (natural cytotoxicity) was calculated. Natural cytotoxicity relatively decreased in the active stage and increased in the inactive stage of BD. Although the difference between the mean value of natural cytotoxicity in the active stage and in the inactive stage was significant, the difference between the averages of active stage and the control group was insignificant. However, the difference between inactive stage and the control group was remarkable. The increase of the natural cytotoxic activity in the inactive period of the disease may play a role together with other immune mechanisms in the aetiopathogenesis of BD.