Astrocytes go into presenter mode.

CD40 engagement and cytokines induce lipid droplet accumulation and antigen presentation in astrocytes, enhancing pathogenic CD4+ T cell responses during experimental autoimmune encephalomyelitis.

• Why it matters: Understanding astrocyte functions in CNS immunopathology is crucial because their role in immune responses may influence disease progression and potential therapies for neuroinflammatory conditions.
• What they did: Lee et al. used experimental autoimmune encephalomyelitis models to show that CD40 engagement and proinflammatory cytokines promote lipid droplet buildup and antigen presentation in astrocytes.
• The result: This discovery suggests astrocytes can switch to a presenter mode, potentially amplifying immune responses and contributing to CNS autoimmune disease mechanisms.