Analysis of adhesion molecules, target cells, and role of IL-2 in human FOXP3+ regulatory T cell suppressor function.

ABSTRACT: FOXP3(+) regulatory T cells (Tregs) are central to the maintenance of self-tolerance and immune homeostasis. The mechanisms of action and cellular targets for Treg-mediated suppression remain controversial. The critical adhesion molecules utilized by Tregs for the interaction with their target cells have not been well characterized. We show that human CD4(+)FOXP3(+)CD25(high) cells (hTregs) suppress the activation of mouse responders as efficiently as mouse Tregs. LFA-1 (CD11a/CD18) on the hTregs is critical for their suppressor function, since suppression can be reversed with blocking anti-hCD11a or anti-hCD18 mAb. Tregs from patients with LFA-1 deficiency fail to suppress human and mouse responders. Mouse CD4(+) T cells deficient in ICAM-1 can be suppressed by hTregs, indicating that the

SUBMITTER: Tran DQ 

PROVIDER: S-EPMC2777511 | biostudies-literature | 2009 Mar

REPOSITORIES: biostudies-literature