CD4+CD25+Foxp3+ T cells (Treg cells) and CD4+CD25+Foxp3+ CCR2-transfected T cells (CCR2-Treg cells) were transferred via retro-orbital injection into 12-week-old MRL/lpr mice at the early stage of pneumonitis and sialadenitis, and the pathological changes were evaluated. Here, FOXP3 is linked to pneumonitis.