Seung-Chul Choi, Yuk Pheel Park, Tracoyia Roach, Damian Jimenez, Amanda Fisher, Mojgan Zadeh, Longhuan Ma, Eric S Sobel, Yong Ge, Mansour Mohamadzadeh, Laurence Morel
The maintenance of regulatory T (Treg ) cells critically prevents autoimmunity. Pre-B cell leukemia transcription factor 1 ( Pbx1 ) variants are associated with lupus susceptibility, particularly through the expression of a dominant negative isoform Pbx1-d in CD4+ T cells. Pbx1-d overexpression impaired Treg cell homeostasis and promoted inflammatory CD4+ T cells. Here, we showed a high expression of Pbx1 in human and murine Treg cells, which is decreased in lupus patients and mice. Pbx1 deficiency or Pbx1-d overexpression reduced the number, stability, and suppressive activity of Treg cells, which increased murine responses to immunization and autoimmune induction...
March 29, 2024: Science Advances