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Phagocyte function in juvenile periodontitis
1Department of Bacteriology and Immunology, University of Helsinki, Finland.
Abstract:
We studied the chemotaxis of peripheral blood polymorphonuclear leukocytes (PMNs) and monocytes and the production of tumor necrosis factor alpha by monocytes of patients with juvenile periodontitis (JP). As a group, the patients' PMNs showed significantly increased chemotaxis determined by counting the number of migrating cells within a 3-microns-pore-size filter. Determined as distance of migration within the filter, as chemotactic increment based on checkerboard analysis, as leukotactic index calculated on the basis of distance of migration and cell count at different depths within a 3-microns-pore-size filter, as distance of migration under agarose, and as the number of PMNs migrating across a 5-microns-pore-size filter, the chemotactic migration rates of PMNs of patients were similar to those of controls. Evaluation of the data on an individual basis suggested that in terms of PMN chemotaxis some patients were hyperresponsive and some were hyporesponsive. Chemotaxis, spontaneous migration, and the rates of lipopolysaccharide-induced tumor necrosis factor alpha production by JP monocytes were similar to those of control cells. Our results give credence to the view that there are minor aberrations in the functions of JP phagocytes, but the extent to which these aberrations are relevant to accumulation of PMNs at sites of infection and inflammation in vivo and possibly contribute to the pathogenesis of JP remains unclear.
Insights
Juvenile periodontitis (JP) patients exhibit varied polymorphonuclear leukocyte (PMN) chemotaxis, with some showing hyper-responsiveness and others hypo-responsiveness. Monocyte functions, including tumor necrosis factor alpha production, remained comparable to controls in JP patients.
Area of Science:
- Immunology
- Oral Biology
- Cell Biology
Background:
- Juvenile periodontitis (JP) is a severe form of gum disease affecting adolescents.
- Understanding immune cell function in JP is crucial for elucidating disease pathogenesis.
Purpose of the Study:
- To investigate the chemotaxis of polymorphonuclear leukocytes (PMNs) and monocytes in patients with JP.
- To assess the production of tumor necrosis factor alpha (TNF-α) by monocytes from JP patients.
Main Methods:
- Chemotaxis assays were performed using various methods, including migration through filters and under agarose.
- Monocyte TNF-α production was measured following lipopolysaccharide (LPS) stimulation.
- Data were analyzed both as a group and on an individual basis.
Main Results:
- As a group, JP patients' PMNs showed significantly increased chemotaxis by cell count.
- However, PMN migration rates, when assessed by distance or other metrics, were similar to controls.
- Individual analysis revealed heterogeneous PMN chemotactic responses (hyper- and hypo-responsive).
- JP monocyte chemotaxis, spontaneous migration, and LPS-induced TNF-α production were comparable to controls.
Conclusions:
- The study suggests minor aberrations in JP phagocyte function, particularly in PMN chemotaxis.
- The clinical relevance of these observed functional differences to PMN accumulation and JP pathogenesis remains uncertain.