Central immune tolerance depends on crosstalk between the classical and alternative NF-κB pathways in medullary thymic epithelial cells
Authors
- M. Riemann
- N. Andreas
- M. Fedoseeva
- E. Meier
- D. Weih
- H. Freytag
- R. Schmidt-Ullrich
- U. Klein
- Z.Q. Wang
- F. Weih
Journal
- Journal of Autoimmunity
Citation
- J Autoimmun 81: 56-67
Abstract
Medullary thymic epithelial cells (mTECs) contribute to self-tolerance by expressing and presenting peripheral tissue antigens for negative selection of autoreactive T cells and differentiation of natural regulatory T cells. The molecular control of mTEC development remains incompletely understood. We here demonstrate by TEC-specific gene manipulation in mice that the NF-{kappa}B transcription factor subunit RelB, which is activated by the alternative NF-{kappa}B pathway, regulates development of mature mTECs in a dose-dependent manner. Mice with conditional deletion of Relb lacked mature mTECs and developed spontaneous autoimmunity. In addition, the NF-{kappa}B subunits RelA and c-Rel, which are both activated by classical NF-{kappa}B signaling, were jointly required for mTEC differentiation by directly regulating the transcription of Relb. Our data reveal a crosstalk mechanism between classical and alternative NF-{kappa}B pathways that tightly controls the development of mature mTECs to ensure self-tolerance.