Knockdown of NR2A and NR2B leads to distinct rearrangements of the dendritic arbor architecture. Knockdown of NR2A and NR2B leads to distinct rearrangements.

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Knockdown of NR2A and NR2B leads to distinct rearrangements of the dendritic arbor architecture. Knockdown of NR2A and NR2B leads to distinct rearrangements of the dendritic arbor architecture. A, Images and drawings of representative neurons imaged on day 1 and day 3 after single-cell electroporation of control, NR2A and NR2B MOs. Axons present in the images are not shown in the drawings. B, Pixel density analysis of the dendritic arbor highlights areas of high and low branch density. C, IBTD analysis shows that cells expressing NR2B MO have shorter IBTDs, whereas neurons expressing NR2A MO have longer IBTDs. Control cells have IBTDs that are in between the two groups. D, Cumulative frequency plot of the IBTDs (control MO vs NR2A MO, *p < 0.01; control MO vs NR2B MO, *p < 0.05; NR2A MO vs NR2B MO, *p < 0.0001). E, Quantification of the averaged median IBTD for each group (control MO, 45.40 ± 3.31 μm; NR2A MO, 52.19 ± 4.77 μm; NR2B MO, 38.78 ± 3.62 μm; *p = 0.05). F, Three-dimensional Sholl analysis of dendritic arbor structure and complexity. G, TDBL is similar at day 1 and day 3 for all three groups [days 1 and 3, respectively (in μm): control MO, 509.77 ± 55.1, 1280.69 ± 166.77; NR2B MO, 511.06 ± 63.15, 1007.61 ± 144.48; NR2A MO, 462.49 ± 63.29, 1208.19 ± 118.39; n = 9–14 cells per group]. H, BTNs are smaller for cells expressing NR2A MO compared with controls on day 3 [days 1 and 3, respectively: control MO, 47.29 ± 5.71, 131.21 ± 16.97; NR2B MO, 49.6 ± 5.94, 109.9 ± 16.1; NR2A MO, 39.89 ± 6.21, 85.33 ± 6.13; *p < 0.05). I, The change in TDBL and BTN over 3 d normalized to the starting size at day 1 shows no significant difference in growth rate or rate of branch tip additions [TDBL and BTN, respectively: control, 1.94 ± 0.44, 2.64 ± 0.66; NR2B MO, 1.21 ± 0.25, 1.3 ± 0.19; NR2A MO, 2.04 ± 0.46, 1.98 ± 0.77]. Error bars are SEM. The statistical tests are Mann–Whitney U tests, and the Kolmogorov–Smirnov test for the cumulative frequency plots. Rebecca C. Ewald et al. J. Neurosci. 2008;28:850-861 ©2008 by Society for Neuroscience