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http://dx.doi.org/10.17135/jdhs.2015.15.6.800

Analgesic Effects of Triptolide and N-nitro-L-arginine Methyl Ester in Rat's Temporomandibular Joint Pain Model  

Kim, Yun-Kyung (Department of Biomedical Health Science, Dong-Eui University)
Lee, Min-Kyung (Department of Biomedical Health Science, Dong-Eui University)
Publication Information
Journal of dental hygiene science / v.15, no.6, 2015 , pp. 800-806 More about this Journal
Abstract
The aim of this study was to investigate whether intracisternal administrations of triptolide and N-nitro-L-arginine Methyl Ester (L-NAME) are involved in the regulation of temporomandibular joint (TMJ) pain. The TMJ pain was induced by the injection of 5% formalin ($30{\mu}l$) into TMJ capsule of rats. The pain behavioral responses was recorded the number of grooming or scratching on the left TMJ area for 9 successive 5 minutes intervals. Triptolide and L-NAME were administrated intracisternally 10 minutes before formalin injection. The intra-articular injection of formalin produced a biphasic pattern of pain response (first phase: 0~10 minutes and second phase: 11~45 minutes). The intracisternal administration of triptolide ($1{\mu}g/10{\mu}l$) and L-NAME ($0.1{\mu}g/10{\mu}l$) suppressed the TMJ pain behavior in each experiment. Co-administration of two drugs was shown the enhanced effect than the analgesic effect by single-administration of triptolide ($1{\mu}g/10{\mu}l$). The triptolide could be a useful analgesic agent for the treatment of TMJ pain, and it is expected to reduce the substantial amount of it via co-administration of synthetic chemical compound and natural products.
Keywords
Analgesic effect; L-NAME; Pain; Temporomandibular joint; Triptolide;
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