Fig. 4

Attenuated neuropathic pain by of MIP after CCI treatment. a-b CCI-induced mechanical allodynia (a) and thermal hyperalgesia (b). Two-way ANOVA, *P < 0.05 versus sham. c-d Pre-intrathecal injection of MIP attenuated CCI-induced mechanical allodynia (c) and thermal hyperalgesia (d) (each administration is indicated by an arrow on the 3, 2, and 1 days before CCI). e-f Mechanical allodynia (e) and thermal hyperalgesia (f) is attenuated by MIP in the early phase of CCI operation (each administration is indicated by an arrow on the 3, 4, and 5 days after CCI). MIP (500 mM) was administrated i.t.in a volume of 20 μl; The control peptide was used in the control (Ctrl) group. Nine rats were included in each group. Two-way ANOVA, *P < 0.05 vs. Sham + Ctrl or Sham + MIP, #P < 0.05 vs. Sham + Ctrl, Sham + MIP or CCI + Ctrl