FIGURE 5.
Dantrolene or Xestospongin C applied at the time and location of axotomy prevent retrograde enhancement of presynaptic release rate. (A) FM unloading curves at 48 h following application of vehicle or Dantrolene (20 μM) or Xestospongin C (1 μM) to axons for 1 h during axotomy. Uninjured control: n = 1076 puncta; Axot. + Veh: n = 893 puncta; Axot. + Dan: n = 1136 puncta; Axot. + Xes: n = 2234; 5 chambers per condition over two experiments. Two-way ANOVA, Bonferroni post hoc test. (B) FM decay time constant (τ) for puncta with τ < 360 s (Uninj. control: n = 1045; Axot. + Veh: n = 857; Axot. + Dan: n = 1058; Axot. + Xes: n = 2139). Unpaired two-tailed t-test. Each condition includes 5 chambers combined over 2 independent experiments. Error bars, SEM. ∗∗p < 0.005.