Journal: Signal Transduction and Targeted Therapy
Article Title: Astrocytic noncanonical WNT5B signaling modulates extracellular matrix remodeling and neuropathology in Huntington’s disease
doi: 10.1038/s41392-025-02545-9
Figure Lengend Snippet: WNT5B overexpression enhances MMP14 expression in striatal astrocytes, leading to extracellular matrix (ECM) disruption and neuronal atrophy in HD mice. ( a ) Experimental design for AAV (pAAV-GFAP(pro)-Control-mCherry or pAAV-GFAP(pro)-WNT5B-P2A-mCherry) delivery into the dorsal striatum of N171-82Q mice via bilateral stereotaxic injection. ( b ) Brain sections stained with cresyl violet. Scale bars: 20 μm. Right: quantification of neuronal size in the dorsal striatum. A total of 40 cells per group were analyzed (8 cells per mouse; N = 5 mice per group: WT, N171-82Q, and N171-82Q + WNT5B). The error bars represent the means ± SEMs. One-way ANOVA ( ***, p < 0.001 ). ( c ) DARPP-32 immunoreactivity was reduced in the striatum of N171-82Q mice and further decreased in N171-82Q + WNT5B mice. Nuclei were counterstained with DAPI. Scale bars: 20 μm. ( d ) Quantitation of DARPP-32 immunoreactivity. A total of 20 cells per group were analyzed (4 cells per mouse; N = 5 mice per group: WT, N171-82Q, and N171-82Q + WNT5B). *, p < 0.05; **, p < 0.01; ***, p < 0.001. ( e ) Immunostaining for MMP14 and GFAP. Three-dimensional (3D) images were reconstructed for Sholl analysis of GFAP-positive astrocytes in the three groups of mice. Scale bars: 20 μm. ( f ) Quantification of MMP14 immunoreactivity in GFAP-positive cells in the dorsal striatum. A total of 15 cells per group were analyzed (3 cells per mouse; N = 5 mice per group: WT, N171-82Q, and N171-82Q + WNT5B). *, p < 0.05; ***, p < 0.001. ( g ) Quantification of the total number of processes associated with astrocytic processes via Sholl analysis. A total of 15 cells per group were analyzed (3 cells per mouse; N = 5 mice per group). One-way ANOVA (*, p < 0.05; **, p < 0.01; ***, p < 0.001). ( h ) Western blot analysis of the MMP14 and GFAP protein levels in striatal lysates from WT, N171-82Q, and N171-82Q + WNT5B mice. ( i ) Densitometry of MMP14 and GFAP protein levels from panel H. N = 3 samples per group. One-way ANOVA (*, p < 0.05; **, p < 0.01). ( j ) Alcian blue staining revealed the loss of glycosaminoglycans in the dorsal striatum of N171-82Q + WNT5B mice. Scale bar: 20 μm. Right: quantification of Alcian blue staining density in the dorsal striatum. Three ROIs (0.05 mm 2 each) per mouse were analyzed ( n = 5 mice per group). *, p < 0.05; ***, p < 0.001. ( k ) mHTT (mEM48) immunoreactivity was elevated in the striatum of N171-82Q + WNT5B mice. Scale bars: 10 μm. Right: quantification of mHTT immunoreactivity. A total of 25 cells per group were analyzed (5 cells per mouse; N = 5 mice per group). *, p < 0.05; ***, p < 0.001
Article Snippet: Primary antibody incubation was performed overnight (24 h) at 4 °C, using the following antibodies at the indicated dilutions: WNT5B (1:100, Santa Cruz, USA), MMP14 (1:200, Abcam, USA), NFATC2 (1:100, Invitrogen, USA), S100β (1:200, Synaptic Systems, Germany), β-catenin (1:200, Santa Cruz, USA), and non-phospho (active) β-catenin (Ser33/37/Thr41; 1:1000, Cell Signaling, USA).
Techniques: Over Expression, Expressing, Disruption, Control, Injection, Staining, Quantitation Assay, Immunostaining, Western Blot