Abstract
1. Intraplantar carrageenin (6 mg 150 microliters-1) evoked a high level of spinal c-Fos expression in the dorsal horn, of segments L4-L5 of the spinal cord, and an extensive peripheral oedema; both parameters were assessed 3 h after carrageenin. 2. Two series of experiments were performed, with the mean total number of Fos like-immunoreactive neurones (Fos-LI), after carrageenin, not being significantly different for the two series of experiments (266 +/- 17 and 332 +/- 31 Fos-LI neurones). For both series of experiments Fos-LI neurones were predominantly located in the superficial and deep laminae, only 10% of the total number of Fos-LI neurones were located in the nucleus proprius and 10% were located in the ventral horn. 3. Pre-administration of the N-methyl-D-aspartate (NMDA) receptor antagonist, (+)-HA966 (0.5 mg kg-1 and 2.5 mg kg-1, s.c.), 30 min before carrageenin, did not significantly influence the total number of Fos-LI neurones, as compared to control carrageenin expression. 4. Pre-administration of the highest dose of (+)-HA966 (10 mg kg-1) significantly reduced the number of deep laminae Fos-LI neurones (28 +/- 3% reduction of control number of Fos-LI neurones after carrageenin, P < or = 0.05), without influencing the number of superficial Fos-LI neurones. There was a tendency towards a reduction of the number of Fos-LI neurones in the nucleus proprius by the highest concentration of pre-administered (+)-HA966, (31 +/- 8% reduction), but this effect did not reach significance.(ABSTRACT TRUNCATED AT 250 WORDS)
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