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. 2021 Nov 19;27(3):1552–1561. doi: 10.1038/s41380-021-01372-y

Fig. 1. Increased density, morphological complexity and recruitment of PNNs around parvalbumin neurons in the vmPFC of depressed suicides with a history of child abuse.

Fig. 1

A Representative images of PNNs labeled with WFL and their distribution throughout human vmPFC cortical layers. Scale bars = 100 and 20 µm (high-magnification panel). B Depressed suicides with a history of child abuse (DS-CA, N = 11) have significantly higher PNN densities compared to controls (CTRL, N = 10) and depressed suicides without history of child abuse (DS, N = 14) (group effect: F(2, 32) = 7.029, P = 0.0029; layer effect: F(3.395, 78.09) = 194.2, P < 0.0001; layer × group: F(10, 115) = 2.07, P = 0.0029, followed by Tukey’s multiple comparison test). C Representative images of a low (top) and high (bottom) intensity PNN in the vmPFC. PNNs from DS-CA subjects (N = 5) showed higher average WFL intensity (arbitrary units) compared to CTRLs (N = 5) or DS (N = 4) (Kruskal–Wallis ANOVA: H(2, 14) = 5.57, P = 0.049, followed by Dunn’s test). D PNNs from DS-CA subjects (N = 5) showed higher complexity (area covered by PNNs) compared to CTRLs (N = 5) or DS (N = 4) (Kruskal–Wallis ANOVA: H(2, 14) = 6.223, P = 0.034, followed by Dunn’s test). E Left: representative images of in situ hybridization for SLC17A7 (green) followed by WFL labeling (red). Nuclei were stained with DAPI (blue); right: representative images of in situ hybridization for PVALB (green) and GAD1 (white) followed by WFL labeling (red). Nuclei were stained with DAPI (blue). Scale bars = 20 µm. F Proportions of WFL-labeled PNNs expressing PVALB (PV+ neurons), GAD1 but not PVALB (other inhibitory neurons), and SLC17A7 (excitatory neurons). G DS-CA (N = 9) subjects have higher ratios of PVALB+ cells surrounded by PNNs compared to CTRLs (N = 8) and DS subjects (N = 4) (Kruskal–Wallis ANOVA H(2,21) = 9.45, P = 0.0037, followed by Dunn’s test), but not of GAD1+/PVALB− cells (Krukal–Wallis ANOVA H(2,20) = 3.28, P = 0.2) nor SLC17A7+ cells (Kruskal–Wallis ANOVA, H(2,21) = 2.58, P = 0.29). G Densities of PV+ cells assessed by immunohistology. No change between groups was observed (group effect: P = 0.132; layer effect: P < 0.0001; group × layer: P = 0.083).