• Xiao-Hui Zhao, Ting Zhang, and Yun-Qing Li.
• Department of Anatomy, Histology and Embryology, K.K. Leung Brain Research Centre, The Fourth Military Medical University, No. 169 West Changle Road, Xi'an 710032, PR China; Department of Physical Education, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an, 710055, PR China. Electronic address: zxh7612@126.com.
• Brain Res. Bull. 2015 Feb 1;111:97-103.

AbstractPeripheral inflammation induces central sensitization that displays the features by the development of pain hypersensitivity to the stimuli. It has been shown that activation of glia contributes to the development of behavioral hypersensitivity after peripheral inflammation. It has been suggested that Toll-like receptor 4 (TLR4) primarily expressed on microglia affects central pain response. The present study was designed to examine the expressions of TLR4 and microglia in the spinal cord in different time points of inflammatory pain induced by complete Freund's adjuvant (CFA). The results show that CFA induces significant pain hypersensitivity and paw edema as well as spinal dorsal horn (SDH) microglia activation with the increased expressions of OX-42 and TLR4 during the inflammatory pain, respectively. The quantification of TLR4 with Western Blot analysis also suggests the same patter with the morphological results during the progress of inflammatory pain. In addition, chronic minocycline hydrochloride intrathecal injection reverses pain hypersensitivity and suppresses activation of microglia and TLR4 induced by CFA, but has hardly any effects on paw edema. Taken together, our data demonstrate the importance of TLR4 and microglia in rats in CFA inflammatory pain states, and suggest that blockade of microglia should likely be considered as a therapeutic opportunity.Copyright © 2015 Elsevier Inc. All rights reserved.

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