Robo3 in the GnRH neuronal system.

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Robo3 in the GnRH neuronal system. Robo3 in the GnRH neuronal system. (A,B) Expression of Robo3 in GnRH neurons. (A) RT-PCR on FACS-sorted E14.5 GFP-GnRH neurons revealed the expression of Robo3 (229 bp). C+, positive control E14.5 mouse head; C–, negative control water. (B) Sagittal sections from E14 Robo3+/– animals were immunostained for GnRH and GFP. Colocalisation of GnRH (red) and Robo3 (green) is indicated (arrowheads and inset). (C-F) Robo3–/– mice have a reduced number of GnRH neurons in the FB. (C-D′) Sagittal sections of E14.5 mouse heads were immunolabelled for GnRH to reveal migrating neurons (arrowheads) in NC and FB. Higher magnification images are shown in C′,D′. There is a reduction of GnRH neurons in the FB of Robo3–/– mice (Δ in D′). (E,F) Counts of GnRH+ neurons in the head (E) and FB (F) of E14.5 wild-type and Robo3–/– mice revealed no differences in total number (E), but a statistically significant reduction in the FB of Robo3 mutants compared with wild-type littermates (F). (G-K) Chemomigratory response of GN11 cells towards Slit2. Representative images of migrated GN11 cells in a Boyden chamber assay with mock conditioned media of COS-7 cells (G) and Slit2-expressing COS-7 cells in the absence (H) or presence of Robo1/2 (I), Robo1-3 (J) or Robo3 (K) antibodies. (L) Counts of migrated GN11 cells/mm2 towards the indicated stimuli. Mean ± s.e.m. **P<0.01, ***P<0.001. Scale bars: 50 μm in B; 100 μm in C,D; 75 μm in C′,D′; 50 μm in G-K. Anna Cariboni et al. Development 2012;139:3326-3331 © 2012.