The effects of intra-articular resiniferatoxin on monosodium iodoacetate-induced osteoarthritic pain in rats

Youngkyung Kim, Eun Hye Kim, Kyu Sang Lee, Koeun Lee, Sung Ho Park, Sook Hyun Na, Cheolwoong Ko, Junesun Kim, Young Wook Yooon

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


This study was performed to investigate whether an intra-articular injection of transient receptor potential vanilloid 1 (TRPV1) receptor agonist, resiniferatoxin (RTX) would alleviate behavioral signs of arthritic pain in a rat model of osteoarthritis (OA). We also sought to determine the effect of RTX treatment on calcitonin gene-related peptide (CGRP) expression in the spinal cord. Knee joint inflammation was induced by intra-articular injection of monosodium iodoacetate (MIA, 8 mg/50 μl) and weight bearing percentage on right and left hindpaws during walking, paw withdrawal threshold to mechanical stimulation, and paw withdrawal latency to heat were measured to evaluate pain behavior. Intra-articular administration of RTX (0.03, 0.003 and 0.0003%) at 2 weeks after the induction of knee joint inflammation significantly improved reduction of weight bearing on the ipsilateral hindlimb and increased paw withdrawal sensitivity to mechanical and heat stimuli. The reduction of pain behavior persisted for 3∼10 days according to each behavioral test. The MIA-induced increase in CGRP immunoreactivity in the spinal cord was decreased by RTX treatment in a dose-dependent manner. The present study demonstrated that a single intra-articular administration of RTX reduced pain behaviors for a relatively long time in an experimental model of OA and could normalize OA-associated changes in peptide expression in the spinal cord.

Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalKorean Journal of Physiology and Pharmacology
Issue number1
Publication statusPublished - 2016 Jan

Bibliographical note

Funding Information:
This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST) 2010-0006489 and 2011-0005415. It was also partially supported by a grant of the Korea Institute of Industrial Technology (KITECH).

Publisher Copyright:
Copyright © Korean J Physiol Pharmacol.


  • Calcitonin gene-related peptide (CGRP)
  • Joint pain
  • Monosodium iodoacetate (MIA)
  • Osteoarthritis
  • Resiniferatoxin (RTX)

ASJC Scopus subject areas

  • Physiology
  • Pharmacology


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