Figure 3

Engineered Tregs localize to the CNS when administered intranasally in naive mice. Treg cells were administered intranasally in the right nostril and the distribution of green fluorescent protein (GFP) in horizontal cryosections of the brain of naïve mice was studied 24 hours after the delivery. The schematic drawing describes a selective immunofluorescence in various brain regions (green spots). GFP immunofluorescence is present in the granular and to a lower extent in the external plexiform layer of the olfactory bulb (B, C), lateral septal nucleus (E), central medial thalamic nucleus (F), ectorhinal cortex (H), medial genic nucleus (I) and cerebellum (K, L) of a CAR Treg-treated naïve mouse. Corresponding areas showing no GFP fluorescence in a PBS-treated naïve mouse are (A, D, G, J). Enlargements of areas in olfactory bulb and cerebellum (as indicated by boxes) are depicted in C and L. Detail of GFP immunofluorescence in the central medial thalamic nucleus and medial genic nucleus (F, I). Cell nuclei (blue) are stained with DAPI Original magnification 10× (A, B, D, E, G, H, J, K) and 40× (C, F, I, L).