Memantine, a promising drug for the prevention of neuropathic pain in rat

作者：Morel Veronique; Etienne Monique; Wattiez Anne Sophie; Dupuis Amandine; Privat Anne Marie; Chalus Maryse; Eschalier Alain; Daulhac Laurence^*; Pickering Gisele

来源：European Journal of Pharmacology, 2013, 721(1-3): 382-390.

DOI：10.1016/j.ejphar.2013.06.020

• Memantine
• Spinal nerve ligation
• Neuropathic pain
• N-methyl-D-aspartate recepto
• NR2B subunit
• Synaptic plasticity

N-methyl-D-aspartate (NMDA) receptor antagonists are used for post-surgery neuropathic pain but severe side-effects limit their clinical use. Memantine, when given after surgery, shows conflicting results as regard to neuropathic pain alleviation. Here memantine is administered in animals before or after spinal nerve ligation (SNL) in order to evaluate the induced antinociceptivelcognitive effects and associated molecular events, including the phosphorylation of several tyrosine (pTyr(1336), pTyr(1472)) and serine (pSer(1303)) residues in the NR2B subunit of the NMDA receptor. Spinal nerve ligated and sham animals received memantine (20 mg/kg/clay) or vehicle (1 mfikg/clay) by intraperitoneal route. Pre-emptive protocol started 4 clays before surgery and continued for 2 clays post-surgery. In the postoperative protocol, the 7 clay-treatment began on the day of surgery. Tests were clone before and after surgery. Tactile allodynia, mechanical hyperalgesia and spatial memory were evaluated by von Frey, Randall & Selitto and Y-maze-tests respectively, and molecular events by western-blot analysis. Spinal nerve ligated animals displayed nociception, impaired memory and increased expression of the 3 phosphorylated residues. Post operative memantine had no beneficial effect. Pre-emptive memantine prevented the development of post surgical nociception, impairment of spatial memory and did not increase the expression of pTyr(1472)NR2B at spinal, insular and hippocampal levels. Memantine administered a few days before surgery is a promising strategy to alleviate neuropathic pain development and impairment of cognitive function in animals. The pivotal role of pTyr(1472)NR2B must be studied further, and these findings will now be challenged in patients for the prevention of postsurgical neuropathic pain. Ks.

• 出版日期2013-12-5