Foxp3+ T-Regulatory Cells in Sjögren's Syndrome

Abstract

Sjögren's syndrome (SS) is a chronic autoimmune exocrinopathy associated with variable lymphocytic infiltration of the affected organs (primarily salivary and lacrimal glands) and broad clinical manifestations, including lymphoma development. To investigate the potential implication of Foxp3(+) T-regulatory cells in the regulation of SS inflammatory responses, we studied their incidence in the minor salivary glands (MSGs) and their relationship with histopathological and clinical disease parameters. Similar percentages of infiltrating Foxp3(+) cells were observed in the MSG lesions of all SS patients (n = 30) and non-SS sialadenitis controls (n = 7). Foxp3(+) cells were not detected in sicca-complaining controls with negative biopsy (n = 6). In SS patients, Foxp3(+) cell frequency varied according to lesion severity, with the highest and lowest frequencies obtained in intermediate and mild MSG lesions, respectively. In the peripheral blood of these patients, reverse distribution of Foxp3(+) cells was observed. Furthermore, the frequency of Foxp3(+) cells in the MSG lesions and peripheral blood was negatively associated (r = -0.6679, P = 0.0065). MSG-infiltrating Foxp3(+) cells were found to positively correlate with biopsy focus score (P = 0.05), infiltrating mononuclear cells, dendritic cells, and macrophages (P