Figure 2. LRP6 is required selectively for excitatory synaptogenesis.
A) (i–iv) Loss of LRP6 leads to reduction in excitatory synapses as evident by reduced number of PSD95 and vGluT1 puncta (n = 20 each). Human LRP6 (hLRP6) that has sequence mismatch with shRNA against mouse/rat LRP6 can rescue the phenotype from effect of shRNA. (v) Loss of LRP6 causes reduction in spine density that can be rescued by hLRP6 (n = 20 each). B) Knockdown of LRP6 does not affect formation of inhibitory synapses, as there was no change in the number of Gephyrin and vGAT puncta in neurons that were transfected with shRNA-LRP6 (n=12). (P < .05, t test). Merged frames show GFP (Green), PSD95 (Red), vGluT1 (Blue) in panel A, and GFP (Green), Gephyrin (Red) and vGAT (Blue) in panel B.
