Abstract
Objective To investigate the analgesic effects of intrathecal administration of Ro 25-6981, a selective antagonist of the NR2B subunit of NMDA receptors (NR2B), in a rat model of incision pain. Methods Sixty SD rats were randomly divided into 4 groups: control group (C); incisional pain group (Ⅰ); intrathecal group of Ro 25-6981 at the dose of 50 μg/25 μl(R1);intrathecal group of Ro 25-6981 at the dose of 200 μg/25 μl(R2). Intrathecal injection of 5% DMSO solvent at the dose of 25 μl was administrated in group C and Ⅰ. Rat models of incisional pain on the right hind were prepared after intrathecal injection in group Ⅰ,R1 and R2. All rats were anesthetized with sevoflurane. The 50% paw withdrawal mechanical threshold (PWMT) and paw withdrawal thermal latency (PWTL) were tested to evaluate the behavioral changes and measured at 24 h before incision and at 2,6,24 h after incision. And the locomotor functions were also examined at the same time points. Results Compared with group C and baseline,the decreases of 50% PWMT (7.0±0.9), (6.7±0.7), (6.4±1.2) g and PWTL (10.3±1.4), ( 10. 1±1.0), (10.0±1.0) s were observed at each time point after incision in group Ⅰ (P＜0.05); Compared with group Ⅰ, significant changes of 50% PWMT and PWTL were not observed at each time point in group R1 (P＞0.05); Compared with group Ⅰ, increases of both 50% PWMT (9.0±0.8) g and PWTL (13.7±1.0) s were observed at 2 h after incision in group R2 (P＜0.05), while no significant changes of 50% PWMT and PWTL were observed at 6 h and 24 h after incision in group R2. No significant changes in locomotor functions were observed before and after intrathecal administration in rats (P＞0.05). Conclusion Intrathecal injection of Ro 25-6981 at the dose of 200.0 μg, the selective antagonist of the NR2B, exerts significant analgesic effects on incision pain in rats without affecting of locomotor functions. Key words: Ro 25-6981; NMDA receptor subunit NR2B; Incision pain; Intrathecal injection
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