• Neuroscience letters · Mar 2015

    Urinary trypsin inhibitor attenuates the development of neuropathic pain following spinal nerve ligation.

    • Seon Hee Oh, Hyung Jin So, Hyun Young Lee, Kyung Joon Lim, Myung Ha Yoon, and Ki Tae Jung.
    • The Division of Natural Medical Sciences, College of Health Science, Chosun University, Seosuk-dong, Dong-gu, Gwangju 501-759, South Korea. Electronic address: seonh@chosun.ac.kr.
    • Neurosci. Lett. 2015 Mar 17;590:150-5.

    AbstractFollowing nerve injury, inflammatory and algesic mediators are released. This neuroinflammatory outbreak causes neuronal damage and chronic neuropathic pain. Urinary trypsin inhibitor (ulinastatin, UTI), which has anti-inflammatory properties and neuroprotective effects, is used to lower the levels of inflammatory factors during surgery. This study evaluated the effect of ulinastatin in a rat model of spinal nerve ligation (SNL). Neuropathic pain was induced by L5 and L6 SNL in male Sprague-Dawley rats. Rats were divided into three groups: group N (control) received normal saline through the tail vein for three days immediately following SNL, group U pre received ulinastatin (50,000 U/kg) intravenously for three days immediately following SNL, and group U post received ulinastatin (50,000 U/kg) intravenously for three days from the 3rd day following SNL. The paw withdrawal threshold was examined and the development of mechanical allodynia was confirmed with a behavioral test using a von Frey filament three days following SNL. On the 3rd, 5th, 7th, 14th, and 28th day following SNL, the paw withdrawal threshold was examined and the levels of inflammatory mediators (i.e., tumor necrosis factor alpha [TNF-α], interleukin-1β [IL-1β], and interleukin-6 [IL-6]) were measured by ELISA. The paw withdrawal threshold was significantly increased in the rats from group U pre compared with the rats from groups N and U post until the 7th post-SNL day (P<0.05). The levels of IL-6 also were significantly decreased in the rats from group U pre compared with the rats from group N and U post until the 7th post-SNL day (P<0.05). Ulinastatin increased the paw withdrawal threshold following SNL when it was administered before the development of neuropathic pain, and may attenuate the development of neuropathic pain.Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.

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