Effects of periodontal therapy on phagocytic activity of peripheral blood neutrophils - evidence for an extrinsic cellular defect.

PURPOSE: To compare phagocytic activity of peripheral blood neutrophils from subjects with and without periodontal disease and evaluate the effects of periodontal therapy in individuals with similar levels of resolution of inflammation at the end of treatment. MATERIALS AND METHODS: To compare the phagocytic activity of neutrophils, peripheral blood was collected from 27 control subjects with a healthy periodontium and 28 periodontitis subjects before and after treatment. The phagocytosis of killed Saccharomyces cerevisiae, pre-sensitised or non-sensitised with fresh serum from the donor, was quantified and a phagocytic index was calculated as the mean number of yeast cells phagocytised by the percentage of neutrophils involved in phagocytosis. RESULTS: Prior to periodontal treatment, subjects with periodontitis exhibited significantly lower neutrophil phagocytic activity than control subjects with a healthy periodontium. Periodontal treatment significantly improved in clinical periodontal status and resulted in significantly increased phagocytosis of both pre-sensitised (from 113.0 pre- to 157.0 post-treatment, P = 0.02) and non-sensitised S. cerevisiae (from 1.5 pre- to 3.5 post-treatment, P = 0.001), to levels observed in control subjects. CONCLUSIONS: The phagocytic activity of peripheral blood neutrophils from subjects with periodontal disease was lower than that of healthy controls. Subjects who underwent non-surgical periodontal treatment and strict supportive therapy for 6 months showed improved phagocytic activity in peripheral blood neutrophils. The phagocytic index values from subjects with periodontal disease after treatment achieved those found in the control group.

Decreased phagocytic function in neutrophils and monocytes from peripheral blood in periodontal disease.

UNLABELLED: Phagocytosis by neutrophils and monocytes constitutes the main defense mechanism against bacterial challenges in periodontitis. Phagocytosis by neutrophils has already been evaluated, whereas phagocytic function of monocytes has hardly been addressed so far. OBJECTIVES: The aim of this study was to assess phagocytosis by neutrophils and monocytes in periodontitis. MATERIAL AND METHODS: The sample included 30 subjects with severe periodontitis and 27 control subjects without periodontal disease. The phagocytic index (PhI) was calculated as the mean number of adhered/ingested Saccharomyces cerevisiae per phagocytozing monocyte or neutrophil multiplied by the percentage of phagocytes involved in phagocytosis. RESULTS: A significant reduction in phagocyte functions was observed in individuals with periodontitis. The median of PhI of neutrophils using nonsensitized S. cerevisiae was 3 for the control group, and 1.5 for the periodontitis group (p=0.01, Mann-Whitney test). The median of PhI of monocytes with non-sensitized S. cerevisiae was 26.13 for the control group, and 13.23 for the periodontitis group (p=0.03, Mann Whitney test). The median of PhI of monocytes assessed with sensitized S. cerevisiae was 97.92 for the control group and 60.1 for the periodontitis group (p=0.005, t-test). CONCLUSION: The data demonstrated a reduction in the function of phagocytes, suggesting a decrease in immune defenses in periodontitis.

Decreased phagocytic function in neutrophils and monocytes from peripheral blood in periodontal disease

Phagocytosis by neutrophils and monocytes constitutes the main defense mechanism against bacterial challenges in periodontitis. Phagocytosis by neutrophils has already been evaluated, whereas phagocytic function of monocytes has hardly been addressed so far. Objectives: The aim of this study was to assess phagocytosis by neutrophils and monocytes in periodontitis. Material and Methods: The sample included 30 subjects with severe periodontitis and 27 control subjects without periodontal disease. The phagocytic index (PhI) was calculated as the mean number of adhered/ingested Saccharomyces cerevisiae per phagocytozing monocyte or neutrophil multiplied by the percentage of phagocytes involved in phagocytosis. Results: A significant reduction in phagocyte functions was observed in individuals with periodontitis. The median of PhI of neutrophils using nonsensitized S. cerevisiae was 3 for the control group, and 1.5 for the periodontitis group (p=0.01, Mann-Whitney test). The median of PhI of monocytes with non-sensitized S. cerevisiae was 26.13 for the control group, and 13.23 for the periodontitis group (p=0.03, Mann Whitney test). The median of PhI of monocytes assessed with sensitized S. cerevisiae was 97.92 for the control group and 60.1 for the periodontitis group (p=0.005, t-test). Conclusion: The data demonstrated a reduction in the function of phagocytes, suggesting a decrease in immune defenses in periodontitis.