Fig. 3.

ADAM10 heterozygous deletion in the forebrain rescues ultrastructural defects of the HD hippocampal synapse. A Diagram showing SVs classification based on distance from the presynaptic membrane (docked: 0–50 nm, reserve: 50–300 nm, resting: > 300 nm) with corresponding tenuous background colors added as a guide for the eye in TEM images reported in panel (B). B Representative TEM images of excitatory synapses in pyramidal neurons of the CA1 region of the hippocampus of WT, R6/2, R6/2-A10cKO and A10cKO mice at 13 weeks of age. Scale bars: 100 nm. PSD, post-synaptic density. C Density of total SVs. D Density of docked SVs. E Density of reserve SVs. F Density of resting SVs. In C-F, n = 3 mice/genotype and n = 60 excitatory synapses/genotype were analyzed. Each dot in the graphs represents the n° SVs/µm² for each excitatory synapse analyzed. Data are presented as mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001, Kruskal–Wallis with Dunn’s multiple comparisons test