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Glucocorticoid Receptor/HCN4 Channels Interaction in Spinal Dorsal Horn Participates in the Regulation of Neuropathic Pain after Peripheral Nerve Injury in Rats

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We studied the interaction between glucocorticoid receptor (GR) and HCN4 channels in the rat model of spared nerve injury (SNI) in Sprague-Dawley rats (n=124). The animals were randomly divided into 6 groups: sham-operated (SO; n=24), SNI (reference group; n=20), and 4 experimental SNI groups intrathecally treated with dexamethasone (DEX; GR agonist; n=20), RU38486 (GR antagonist; n=20), ZD7288 (HCN channels blocker; n=20), and ZD7288+DEX (n=20). The paw mechanical withdrawal threshold (PWT) was measured one day before surgery (SO group) and on days 1, 3, 7, 14, and 21 after surgery. Behavioral results showed that mechanical hyperalgesia appeared on day 1 after SNI, while PWT decreased gradually with time. The expression of GR and HCN4 channels in L4-L6 dorsal horn of the spinal cord was detected by Western blotting and immunohistochemistry. In the reference group, SNI significantly increased GR expression up to day 14 after surgery in comparison with the SO group. The expression of GR showed a tendency to increase in the DEX group (with the maximum expression on days 14 and 21), significantly increased in the RU38486 group (maximum on day 7). In the ZD7288 group, GR expression was lower than in the SNI group and did not change throughout the experiment, suggesting that ZD7288 could block the expression of GR. In the DEX group, the expression of HCN4 channels was significantly higher on day 1 after SNI, but there were no differences in this parameter between the RU38486 and ZD7288 groups. In the ZD7288+DEX group, the expression of HCN4 channels significantly increased on days 14 and 21 after SNI. Thus, GR and HCN4 have the same linkage in the formation of central sensitization after SNI, but antagonists have no significant effect on the improvement of pain behavior.

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Authors and Affiliations

  1. Department of Anesthesiology, First Affiliated Hospital of Dalian Medical University, Dalian, China

    L. Zhengshuai, F. Yan, L. Jinglin & W. Chunmei

  2. Department of Physiology, Dalian Medical University, Dalian, China

    P. Hua

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  1. L. Zhengshuai
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  2. F. Yan
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  3. L. Jinglin
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  4. P. Hua
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  5. W. Chunmei
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Correspondence to P. Hua or W. Chunmei.

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Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 173, No. 5, pp. 558-566, May, 2022

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Zhengshuai, L., Yan, F., Jinglin, L. et al. Glucocorticoid Receptor/HCN4 Channels Interaction in Spinal Dorsal Horn Participates in the Regulation of Neuropathic Pain after Peripheral Nerve Injury in Rats. Bull Exp Biol Med 173, 594–601 (2022). https://doi.org/10.1007/s10517-022-05594-0

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