title: Natural T Regulatory Cells (n Treg) in the Peripheral Blood of Healthy Subjects and Subjects with Chronic Periodontitis - A Pilot Study.
abstract: BACKGROUND
  The T cells play a central role in the aetiopathogenesis of periodontal disease. Natural T regulatory cells (nTreg) are the key stone immunoregulatory elements having an anergic phenotype and play an important role in the suppression of exaggerated immune responses thereby maintaining homeostasis. There are increasing evidences for the role of nTreg in the periodontal disease pathogenesis.
  
  
  OBJECTIVE
  To identify the proportion of natural T regulatory cells in the peripheral blood of periodontally healthy subjects and subjects with chronic periodontitis.
  
  
  METHODS
  A total of 15 subjects (7 with healthy gingiva and 8 with chronic periodontitis) were recruited for this pilot study. Baseline periodontal parameters were recorded and 5 ml of peripheral blood was collected. The samples from both the groups were analysed for the relative proportion of nTreg (identified by the expression CD45RB+CD4+CD25+FOXP3+) using flow cytometry.
  
  
  RESULTS
  The mean percentages of the CD45RB+CD4+CD25+ cells expressing FOXP3 in control and chronic periodontitis group were found to be 14.75±5.04 and 43.13±11.17 respectively. The mean proportion of nTreg were compared between the control and chronic periodontitis sample using Mann-Whitney Test and was found to be statistically significant with (p<0.001).
  
  
  CONCLUSIONS
  A higher proportion of nTreg in the peripheral blood sample of chronic periodontitis subjects were observed as compared to that of healthy individuals.
authors.affiliation: Senior Lecturer, Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra University , Chennai, India .
authors.forename: Ram
authors.initials: R
authors.lastname: Sabarish
authors.affiliation: Professor and Head, Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra University , Chennai, India .
authors.forename: Suresh Ranga
authors.initials: SR
authors.lastname: Rao
authors.affiliation: Associate Professor, Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra University , Chennai, India .
authors.forename: Vamsi
authors.initials: V
authors.lastname: Lavu
keywords: CD25; FOXP3; Periodontal disease; Regulatory T lymphocytes