Figure 3.
Tactile allodynia in a model of inflammatory pain is prevented by suppressing Netrin-4. (A and B) Paw withdrawal threshold of wild-type littermates (+/+; n = 6; A) and Netrin-4–mutant (Tp/Tp; n = 6; B) rats after CFA injections. After surgery, the +/+ rats showed decreases in the thresholds on the ipsilateral (ipsi) side (A), whereas the Tp/Tp rats did not exhibit decreases (B). contra, contralateral. (C) Comparison of the relative withdrawal thresholds between +/+ and Tp/Tp animals after CFA injections. (D) Effect of Netrin-4 siRNA on inflammation-induced tactile allodynia. The paw withdrawal threshold of the Netrin-4 siRNA–treated group (●; n = 6) was significantly increased compared with the control siRNA–treated group (○; n = 6). The data are presented as the mean ± SEM. *, P < 0.05; **, P < 0.01; Tukey-Kramer test. Each experiment was performed three times.