@rheumnow #ACR2019 ABS857 Stdy of 21 SLE pts received allogenic mesench stem cells IV ⬇️ inflamm through upregulation of periph tolerogenic CD1c+ DC, esp in LN. UC-MSCs express FLT3L that binds to FLT3 on CD1c+DCs to promote proliferat&inhibit apoptosis of tolerogenic CD1c+DCs