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Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury

  • Authors:
    • Lan‑Ji Huang
    • Shu‑Shan Jia
    • Xue‑Hua Sun
    • Xin‑You Li
    • Fei‑Fei Wang
    • Wei Li
    • Qing‑Song Jin
  • View Affiliations / Copyright

    Affiliations: Department of Anesthesiology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China, Department of Endocrinology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China
    Copyright: © Huang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 2684-2690
    |
    Published online on: July 17, 2020
       https://doi.org/10.3892/etm.2020.9019
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Abstract

In the present study, the ability of baicalin to relieve neuropathic pain due to spinal nerve ligation in rats was explored, and the relationship between baicalin and α2‑adrenoceptors (α2‑AR) was determined. The neuropathic pain model was established by ligating the L5‑L6 spinal nerves in Sprague‑Dawley rats. Several α2‑AR antagonists were injected into the intramedullary sheath to evaluate the role of baicalin in neuropathic pain. The antagonists included nonselective α2‑AR antagonist idazoxan, α2a‑AR antagonist BRL 44408, α2b‑AR antagonist ARC 239 and α2c‑AR antagonist JP 1302. The rats were divided into an untreated control group, saline group, baicalin group and baicalin + α2‑AR antagonist groups. Paw withdrawal threshold (PWT) was tested to assess the level of pain felt by the rats. The levels of α2‑AR mRNA were tested by reverse transcription‑quantitative PCR. Inflammatory factors, including tumor necrosis factor (TNF)‑α, interleukin (IL)‑6, IL‑17 and IL‑1β, were analyzed by ELISA. The histopathological changes were assessed by hematoxylin and eosin staining. Flow cytometry was used to examine the percentage of CD4+ peripheral blood mononuclear cells (PBMCs). Compared with the saline group, the PWT value increased after treating with baicalin. However, intrathecal injection of α2‑AR antagonist reversed the antinociceptive effects of baicalin. Compared with the saline group, the expression of α2a‑AR and α2c‑AR mRNA was upregulated significantly in the baicalin group (P<0.05). Levels of α2‑AR mRNA were also decreased in the baicalin + idazoxan group compared with the baicalin group (P<0.05). The levels of TNF‑α, IL‑6, IL‑17 and IL‑1β were raised after treatment with baicalin. In addition, baicalin treatment ameliorated the histological damage in the spinal cord. The percentage of CD4+ PBMCs was increased in the saline group compared with the control group (P<0.05). Compared with the baicalin group, the percentage of CD4+ PBMCs was raised after treatment with the α2‑AR antagonists. In conclusion, intrathecal injection of baicalin produced an antiallodynic effect in a spinal nerve ligation‑induced neuropathic pain model. The mechanism may be related to the regulation of a2‑AR expression.
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Copy and paste a formatted citation
Spandidos Publications style
Huang LJ, Jia SS, Sun XH, Li XY, Wang FF, Li W and Jin QS: Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury. Exp Ther Med 20: 2684-2690, 2020.
APA
Huang, L., Jia, S., Sun, X., Li, X., Wang, F., Li, W., & Jin, Q. (2020). Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury. Experimental and Therapeutic Medicine, 20, 2684-2690. https://doi.org/10.3892/etm.2020.9019
MLA
Huang, L., Jia, S., Sun, X., Li, X., Wang, F., Li, W., Jin, Q."Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury". Experimental and Therapeutic Medicine 20.3 (2020): 2684-2690.
Chicago
Huang, L., Jia, S., Sun, X., Li, X., Wang, F., Li, W., Jin, Q."Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury". Experimental and Therapeutic Medicine 20, no. 3 (2020): 2684-2690. https://doi.org/10.3892/etm.2020.9019
Copy and paste a formatted citation
x
Spandidos Publications style
Huang LJ, Jia SS, Sun XH, Li XY, Wang FF, Li W and Jin QS: Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury. Exp Ther Med 20: 2684-2690, 2020.
APA
Huang, L., Jia, S., Sun, X., Li, X., Wang, F., Li, W., & Jin, Q. (2020). Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury. Experimental and Therapeutic Medicine, 20, 2684-2690. https://doi.org/10.3892/etm.2020.9019
MLA
Huang, L., Jia, S., Sun, X., Li, X., Wang, F., Li, W., Jin, Q."Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury". Experimental and Therapeutic Medicine 20.3 (2020): 2684-2690.
Chicago
Huang, L., Jia, S., Sun, X., Li, X., Wang, F., Li, W., Jin, Q."Baicalin relieves neuropathic pain by regulating α2‑adrenoceptor levels in rats following spinal nerve injury". Experimental and Therapeutic Medicine 20, no. 3 (2020): 2684-2690. https://doi.org/10.3892/etm.2020.9019
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