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Flow cytometric approach to human polymorphonuclear leukocyte activation induced by gingival crevicular fluid in
R Biselli1, C Ferlini, C Di Murro
1Laboratorio di Immunologia, Rep. Medicina, D.A.S.R.S., Aeroporto Pratica di Mare, Roma, Italy.
Abstract:
In gingival pockets of patients with periodontal disease, polymorphonuclear leukocytes (PMN) are in contact with a peculiar exudate, the gingival crevicular fluid (GCF). Because of the pivotal role played by PMN in periodontal disease, we evaluated the ability of GCF in modulating normal human PMN. GCF was obtained from two gingival sites with severe periodontitis (SP) and two gingival sites with only mild periodontitis (MP) in 12 patients. Purified PMN were exposed to GCF from SP and MP sites and, as a control, to sterile culture medium. GCF activity was evaluated by monitoring the modulation of membrane molecules relevant to cell function. Compared to control medium, GCF from SP and MP sites was able to induce an activation status in PMN evidenced by an increased CD11b (62 +/- 9% and 28 +/- 7%, respectively) and f-Met-Leu-Phe (56 +/- 5% and 31 +/- 7%, respectively) receptor expression, with a concomitant reduction of CD62L expression (56 +/- 8% and 23 +/- 7%, respectively). Thus, reflecting the clinical status, GCF from SP sites was significantly more efficient in affecting PMN than GCF from MP sites. Cell size modifications, evaluated as an additional indicator of PMN activation, were consistent with membrane molecule modulation. The difference in PMN-activating capacity between SP and MP was abrogated by the successful completion of an appropriate periodontal therapy that dramatically improved clinical status. This is the first direct demonstration that GCF from periodontitis has the capacity to activate normal resting PMN and that this capacity reflects the magnitude of the inflammatory process that takes place in the gingiva.
Insights
Gingival crevicular fluid (GCF) from periodontitis activates human polymorphonuclear leukocytes (PMN). This activation correlates with disease severity and is reversed by periodontal therapy, highlighting GCF
Area of Science:
- Oral Biology
- Immunology
- Periodontology
Background:
- Periodontal disease involves polymorphonuclear leukocytes (PMN) interacting with gingival crevicular fluid (GCF).
- Understanding GCF's role in modulating PMN function is crucial for periodontitis research.
Purpose of the Study:
- To investigate the capacity of GCF from periodontitis patients to modulate normal human PMN.
- To determine if GCF's effect on PMN correlates with the severity of periodontitis.
Main Methods:
- GCF was collected from patients with severe (SP) and mild (MP) periodontitis.
- Human PMN were exposed to GCF, and changes in membrane molecule expression (CD11b, f-Met-Leu-Phe, CD62L) and cell size were analyzed.
Main Results:
- GCF from both SP and MP sites significantly increased PMN activation markers (CD11b, f-Met-Leu-Phe) and decreased CD62L expression compared to controls.
- GCF from SP sites demonstrated a greater capacity to activate PMN than GCF from MP sites.
- Periodontal therapy reversed the PMN-activating capacity of GCF, correlating with improved clinical status.
Conclusions:
- GCF from periodontitis patients directly activates normal human PMN.
- The extent of PMN activation by GCF reflects the magnitude of the gingival inflammatory process.
- Successful periodontal therapy diminishes the PMN-activating potential of GCF.