1539-Astrocyte CD40&MHC-II Presentation in CNS Autoimmunity

Recent research identifies a specific subset of astrocytes expressing CD40 and MHC-II that actively drive autoimmune responses in the central nervous system. Using advanced tools like RABID-seq and CRISPR-Cas9, scientists discovered that these glial cells function as non-professional antigen-presenting cells by interacting directly with CD4+ T cells. These interactions specifically amplify the activity of pathogenic TH17 cells, which are known to worsen conditions like multiple sclerosis and its animal model, EAE. The study further reveals that CD40 signaling triggers the accumulation of lipid droplets within astrocytes, providing the metabolic energy needed to sustain their inflammatory and antigen-presenting roles. These findings were validated in human multiple sclerosis samples, suggesting that targeting these astrocyte-T cell partnerships could offer a new therapeutic path for treating neuroinflammatory diseases.

References:

• Lee J H, Li Z, Soto J S, et al. Antigen presentation by CD40+ MHC-II+ astrocytes promotes CNS autoimmunity[J]. Nature, 2026: 1-10.