14
Apr
On days 1 and 2, fresh viral supernatant was added and spun at 2500 rpm for 90 min in the presence of 6 g/ml of polybrene. lymphocyte antigen-4 (CTLA-4) is a structural homologue of CD28 and a negative regulator required for T cell homeostasis and tolerance1,2. CTLA-4/mice develop a fatal lymphoproliferative disorder characterized by expansion of CD4+T cells into multiple non-lymphoid tissues35. While the importance of CTLA-4 is clear, several aspects of its mechanism in maintaining self-tolerance are poorly understood6. Specifically, it is not clear if specific self-antigens are involved in the expansion of CD4+T cells or in which lymphocyte…