Inhibition of Spinal TRPV1 Reduces NMDA Receptor 2B Phosphorylation and Produces Anti-Nociceptive Effects in Mice with Inflammatory Pain

被引:20
作者
Kang, Suk-Yun [1 ]
Seo, Su Yeon [1 ]
Bang, Se Kyun [1 ]
Cho, Seong Jin [1 ]
Choi, Kwang-Ho [1 ]
Ryu, Yeonhee [1 ]
机构
[1] Korea Inst Oriental Med, KM Sci Res Div, Daejeon 34054, South Korea
关键词
transient receptor potential vanilloid 1 (TRPV1); N-methyl-D-aspartate (NMDA); glutamate; capsazepine; inflammatory pain; NEUROPATHIC PAIN; MECHANICAL HYPERALGESIA; MOLECULAR-MECHANISMS; REPETITIVE TREATMENT; INVOLVEMENT; MODULATION; MODELS;
D O I
10.3390/ijms222011177
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Transient receptor potential vanilloid 1 (TRPV1) has been implicated in peripheral inflammation and is a mediator of the inflammatory response to various noxious stimuli. However, the interaction between TRPV1 and N-methyl-D-aspartate (NMDA) receptors in the regulation of inflammatory pain remains poorly understood. This study aimed to investigate the analgesic effects of intrathecal administration of capsazepine, a TRPV1 antagonist, on carrageenan-induced inflammatory pain in mice and to identify its interactions with NMDA receptors. Inflammatory pain was induced by intraplantar injection of 2% carrageenan in male ICR mice. To investigate the analgesic effects of capsazepine, pain-related behaviors were evaluated using von Frey filaments and a thermal stimulator placed on the hind paw. TRPV1 expression and NMDA receptor phosphorylation in the spinal cord and glutamate concentration in the spinal cord and serum were measured. Intrathecal treatment with capsazepine significantly attenuated carrageenan-induced mechanical allodynia and thermal hyperalgesia. Moreover, carrageenan-enhanced glutamate and phosphorylation of NMDA receptor subunit 2B in the spinal cord were suppressed by capsazepine administration. These results indicate that TRPV1 and NMDA receptors in the spinal cord are associated with inflammatory pain transmission, and inhibition of TRPV1 may reduce inflammatory pain via NMDA receptors.
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页数:13
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