D-Aspartate Modulates Nociceptive-Specific Neuron Activity and Pain Threshold in Inflammatory and Neuropathic Pain Condition in Mice

Figure 2

Representative ratemeters showing the responses of a single spinal NS neuron to a mechanical noxious stimulation (von Frey filaments 97.8 mN/2 sec) in Ddo ^+/+ (a and c) and Ddo ^−/− (b and d) male mice 7 days after sham (a and b) or CCI (c and d) surgery. The lower panels show the evoked activity (e), the duration (f), and the onset (g) of the evoked activity induced by the noxious stimulation in NS neurons in sham and CCI Ddo ^+/+ or Ddo ^−/− male mice. Small black arrows indicate the noxious stimulation on mouse hind paw and grey scale bar indicates 5 min intervals for ratemeter. Each point represents the mean ± S.E.M of 6–8 neurons of different groups of mice. values were considered statistically significant (two-way ANOVA followed by Bonferroni posttest, for comparisons between groups). indicates significant differences versus Sham/Ddo ^+/+, ^#significant differences versus sham/Ddo ^−/−, and ^°significant differences versus CCI/Ddo ^+/+.

(a)

(b)

(c)

(d)

(e)

(f)

(g)