Journal
BIOMED RESEARCH INTERNATIONAL
Volume 2015, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2015/812949
Keywords
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MEST) [2012-0003901]
- Korea Institute of Industrial Technology (KITECH)
- Korea University College of Health Science [K1508371]
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The present study examined the analgesic effects of slow-releasing bupivacaine from hydrogel on chronic arthritic pain in rats. Osteoarthritis (OA) was induced by monosodium iodoacetate (MIA) injection into the right knee joint. Hydrogel (HG: 20, 30, and 50 mu L) and temperature-sensitive hydrogel containing bupivacaine (T-gel: 20, 30, and 50 mu L) were injected intra-articularly 14 days after MIA injection. Behavioral tests were conducted. The rats showed a significant decrease in weight load and paw withdrawal threshold (PWT). Intra-articular 0.5% bupivacaine (10 and 20 mu L) significantly reversed MIA-induced decreased PWT, with no effect on weight load. In normal rats, hydrogel did not produce significant changes in PWT but at 30 and 50 mu L slightly decreased weight bearing; T-gel did not cause any changes in both the weight load and PWT. In OA rats, T-gel at 20 mu L had a significant analgesic effect for 2 days, even though T-gel at 50 mu L further reduced the weight load, demonstrating that intra-articular T-gel (20 mu L) has long-lasting analgesic effects in OA rats. Thus, T-gel designed to deliver analgesics into the joint cavity could be an effective therapeutic tool in the clinical setting.
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