Density of dendritic spines on L2/3 pyramidal neurons is greater in visual cortex of germline PirB−/− mice than in PirB+/+ mice at P30. Density of dendritic.

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Density of dendritic spines on L2/3 pyramidal neurons is greater in visual cortex of germline PirB−/− mice than in PirB+/+ mice at P30. Density of dendritic spines on L2/3 pyramidal neurons is greater in visual cortex of germline PirB−/− mice than in PirB+/+ mice at P30. A, A low-magnification fluorescence micrograph of P30 mouse visual cortex showing GFP expression (green) in cells in L2/3 after GFP.Cre electroporation at E15.5. B, C, Higher-magnification views of boxed region shown in A; DAPI nuclear counterstain (B) shows that most of the GFP+ neurons (C) are in layer 2 and upper layer 3. Soluble GFP fills the cells: cell bodies and dendrites, as well as descending axons clustering within layer 5 are all clearly visible. D, High-magnification maximum intensity projection of boxed region shown in C. Dendritic spines and axonal boutons are visible. E–H, High-magnification fluorescent micrographs showing apical (E, G) and basal (F, H) dendritic spines in PirB+/+ and PirB−/− mice. I, Apical dendritic spine density on L2/3 pyramidal neurons of PirB−/− visual cortex is elevated compared with PirB+/+ (PirB+/+ GFP+;Cre+: 7.0 ± 0.6 dendritic spines/10 μm of dendrite length, n = 9 cells, 5 mice; PirB−/−: GFP+;Cre+: 11.5 ± 1.0, n = 13 cells, 5 mice; p = 0.004a, one-way ANOVA with post hoc Bonferroni’s multiple comparisons). J, Basal dendritic spine density is also increased in PirB−/− mice compared with PirB+/+ mice (PirB+/+ GFP+;Cre+: 6.6 ± 0.6 dendritic spines/10 μm of dendrite length, n = 9 cells, 5 mice; PirB−/− GFP+;Cre+: 11.4 ± 1.1, n = 10 cells, 5 mice; p = 0.002b, one-way ANOVA with post hoc Bonferroni’s multiple comparisons). K, L, Sholl analysis reveals no significant changes in apical (K) or basal (L) dendritic branching between PirB+/+ and PirB−/− L2/3 neurons (PirB+/+ GFP+;Cre+: n = 5 cells, 3 mice; PirB−/− GFP+;Cre+: n = 8 cells, 5 mice; p = 0.2443c (K), p = 0.0574d (L), two-way ANOVA with repeated measures). **p < 0.01. Scale bars: A, 0.2 mm; B, C, 50 μm; D, 25 μm; E–H, 3 μm. George S. Vidal et al. eneuro 2016;3:ENEURO.0089-16.2016 ©2016 by Society for Neuroscience