Figure 5.

Nitration of glutamine synthase occurs following NMDA (2 nmol) induced thermal hyperalgesia ((a)–(c)). The time at which the NMDA mediated hyperalgesia was at its peak (40 minutes), immunoprecipitation analysis revealed that FeTM-4-PyP⁵⁺ (2 nmol given 15 min before NMDA) reduced the NMDA mediated nitration of GS at the level of the spinal cord ((a)–(b)). Immunoprecipitation data are representative of at least 6 gels from 3 different animals performed on different days. Bar graph in (b) represents quantification by densitometric analysis. No difference for GS or β-actin expression was detected among the lanes in these conditions. ^† P < 0.001 compared to vehicle and *P < 0.001 compared to NMDA alone.