| First Author | Mor A | Year | 2008 |
| Journal | Eur J Immunol | Volume | 38 |
| Issue | 6 | Pages | 1493-502 |
| PubMed ID | 18461565 | Mgi Jnum | J:136199 |
| Mgi Id | MGI:3795623 | Doi | 10.1002/eji.200838292 |
| Citation | Mor A, et al. (2008) N-Ras or K-Ras inhibition increases the number and enhances the function of Foxp3 regulatory T cells. Eur J Immunol 38(6):1493-502 |
| abstractText | Naturally occurring regulatory T cells (Treg) driven by their transcriptional controller Foxp3 are compromised in immune-mediated disorders and confer protection when adoptively transferred. We examined the Ras-inhibitory effect on functional determinants of Treg in vivo and in vitro. Ras was inhibited in Jurkat T cells by transfection with a dominant-negative form of Ras, or by shRNA for N-Ras, K-Ras, and H-Ras, or by farnesylthiosalycylic acid, a small-molecule inhibitor. Except for H-Ras transduction with shRNA, each inhibitory mode increased expression of Foxp3 and nuclear factor of activated T cell proteins, and surface expression of CD25. Ras inhibition in PBMC and spleen-derived lymphocytes reproduced these findings. The heightened Foxp3 expression reflected both increased basal cellular protein and peripheral conversion of non-Treg to Treg. Ras inhibition enhanced Treg-induced suppression; thus, when adoptively transferred to mice, Ras-inhibited Treg reduced the incidence of diabetes. Inhibition of Foxp3 by respective siRNA reversed the enhancement. Thus, inhibition of the N- or K-Ras isoform triggers an anti-inflammatory effect by up-regulating, via Foxp3 elevation, the numbers and functional suppressive properties of Treg. |
