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. 2021 Feb 2;12:751. doi: 10.1038/s41467-021-21025-6

Fig. 7. The Cdc42 downregulation suppresses sLTP induced by single- and clustered-spine stimulation.

Fig. 7

a Verification of shRNA. HeLa cells were transfected with control shRNA (shCtrl) or shRNA against Cdc42 (shCdc42), coexpressed with wild-type Clover-Cdc42 or its shRNA-resistant mutant (Clover-Cdc42res), respectively. The transfection of shCdc42 suppresses the expression of Clover-Cdc42 (lane 2 in the top panel). The transfection of shCdc42 does not suppress the expression of Clover-Cdc42res (lane 3 in the top panel). Averaged time courses of spine volume change upon single-spine stimulation (b) or clustered-spine stimulation (e) in neurons under manipulations of Cdc42 signaling. For single-spine stimulation, n(spines/neurons) = 17/6 shCtrl, 13/7 shCdc42, and 12/4 rescue. For clustered-spine stimulation, n(spines/neurons) = 51/6 shCtrl, 45/7 shCdc42, and 25/4 rescue. Quantification of transient (c, averaged over 4–6 min) and sustained (d, averaged over 20–30 min) spine volume change after single-spine stimulation. The data set used in b was analyzed. n(spines/neurons) is the same as in b. f Quantification of spine volume change (averaged over 20–30 min) after clustered-spine stimulation. The data set used in e was analyzed. n(spines/neurons) is the same as in e. g A model of CaMKII-dependent Cdc42 activation and its relationship with sLTP. Simultaneous activation of CaMKII in clustered spines leads to enhanced Cdc42 activity and sLTP. For all figures, the data are presented as mean ± SEM. Statistical comparisons were performed using two-tailed unpaired t test (c, d, and f). ***p < 0.001; **p < 0.01; *p < 0.05; N.S. not significant. Source data are provided as a Source Data file.