IONC increased non-PrV2-origin lemniscal fiber terminals in V2 VPM related to newly recruited lemniscal fibers onto VPM neurons. IONC increased non-PrV2-origin.

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IONC increased non-PrV2-origin lemniscal fiber terminals in V2 VPM related to newly recruited lemniscal fibers onto VPM neurons. IONC increased non-PrV2-origin lemniscal fiber terminals in V2 VPM related to newly recruited lemniscal fibers onto VPM neurons. A, VGluT2-immunostained V2 VPM sections of Krox20-Ai14 mice. VGluT2 is a marker of lemniscal fiber terminals in the VPM. Top, Significant increase of tdT-negative (non-PrV2-origin) VGluT2 puncta in the contralateral V2 VPM after IONC. Scale bar, 20 µm. Bottom, The soma and dendrites of V2 VPM neurons were visualized by fluoro Nissl and MAP2 stainings, respectively, in addition to VGluT2 and tdTomato (top) to examine subcellular distribution of the VGluT2 puncta in their origin-specific manner. * indicates a V2 VPM neuron; arrows indicate somatic puncta; arrowheads indicate dendritic puncta. Scale bar, 5 µm. B, Summary density of VGluT2 puncta in the V2 VPM. tdT(+) = tdTomato-positive VGluT2; tdT(-) = tdTomato-negative ones. C, IONC decreased proportion of tdT(+) VGluT2 puncta in the contralateral V2 VPM. D, Summary numbers of VGluT2 puncta on the soma (left) and proximal dendrites (right) in the contralateral V2 VPM. tdT-positive puncta decreased whereas tdT-negative ones increased both on the soma and dendrites. A marker indicates each V2 VPM neuron examined. tdT(+) = tdTomato-positive VGluT2; tdT(-) = tdTomato-negative ones. E, Correlated postoperative time course of anatomic and functional lemniscal fiber remodeling in the V2 VPM. Top: VGluT2 immunostaining. Scale bar, 20 µm. Bottom: Discrete lemniscal fiber-mediated EPSCs in a V2 VPM neuron in response to increasing electrical stimuli on the medial lemniscal fiber bundle (Takeuchi et al., 2012). F, Correlation between anatomic and functional lemniscal fiber remodeling in the contralateral V2 VPM. r, Pearson’s correlation coefficient. Broken line is the regression line. G, Experimental schedule of whisker deprivation. H, VGluT2-immunostained sections of the V2 VPM in Krox20-Ai14 mice after whisker deprivation. Scale bar, 20µm. I, Summary density of VGluT2 puncta in the contralateral V2 VPM. tdT(+) = tdTomato-positive VGluT2; tdT(-) = tdTomato-negative ones. Values are represented as mean (±SD). Three to nine mice (eight images from each mouse) were analyzed for each group in A–I. In total, 94 neurons from four mice (4-10 neurons from each image) were analyzed for each group in D. In total, 215 neurons from 91 mice and 118 images from 14 mice were analyzed for E and F. Statistical significance was tested by two-way repeated measures ANOVA (main effect of IONC or whisker deprivation; B–D and I) and Pearson’s product-moment correlation test (F). *p < 0.05; **p < 0.01; ***p < 0.001; n.s., not significant; two-tailed. Yuichi Takeuchi et al. eNeuro 2017;4:ENEURO.0345-16.2017 ©2017 by Society for Neuroscience