Temozolomide causes a dose- and time-dependent loss of PSD95 puncta in cultured hippocampal neurons. (A) Graph and representative images of dendrites immunolabeled for postsynaptic density-95 (PSD95) depict a dose-dependent reduction in PSD95 puncta after 4 h exposure. (B) The loss of PSD95 is more prominent after 24 h exposure. Dendritic beading (arrows) prevented quantification out to 100 μm from the soma for the 500 μM TMZ dose at 24 h, and therefore was omitted from the analysis. Scale bars, 5 μm. Data are presented as mean ± SEM, **** p < 0.0001, (n = 4 neurons per group). Scale bars, 20 μm. Red, PSD95.