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Tetrandrine attenuates SNI-induced mechanical allodynia by inhibiting spinal CKLF1
Neuropharmacology ( IF 4.6 ) Pub Date : 2023-07-28 , DOI: 10.1016/j.neuropharm.2023.109673
Zhi-Ling Zhang 1 , Zhi-Tong Wang 1 , Jing Shi 1 , Xiao-Ping Pu 2 , Suo-Di Zhai 1
Affiliation  

Neuropathic pain (NP) is a prevalent clinical problem for which satisfactory treatment options are unavailable. Tetrandrine (TET), a bisbenzylisoquinoline alkaloid extracted from , possesses anti-inflammatory and immune-modulatory properties. Chemokine-like factor 1 (CKLF1) is known to play a crucial role in both peripheral and central inflammatory processes. This study aimed to investigate the potential anti-NP effects of TET and the involvement of CKLF1 in the action of TET. A male C57BL/6J mice model of NP caused by spared nerve injury (SNI) was established and mechanical withdrawal thresholds were measured using von Frey filaments. The results showed that TET improved mechanical allodynia in SNI mice and the propofol-induced sleep assay demonstrated that the TET group did not exhibit central inhibition, while the pregabalin (PGB) group showed significant central inhibition. Western blotting and immunofluorescence staining showed that TET significantly inhibited spinal protein expression levels of CKLF1, p-NF-κB/NF-κB, p-IKK/IKK, pro-inflammatory cytokines IL-1β and TNF-α, and increased protein expression levels of the anti-inflammatory cytokine IL-10, while inhibiting the expression levels of microglia and astrocyte markers IBA-1 and GFAP of SNI mice. Moreover, immunofluorescence double-labeling results revealed that CKLF1 was predominantly colocalized with microglia of the spinal cord (SC) in SNI mice. C19 (an antagonism peptide of CKLF1) alleviated SNI-induced mechanical pain hypersensitivity, while C27 (an analog peptide of CKLF1) induced mechanical allodynia in normal mice. TET significantly attenuated mechanical allodynia induced by C27 in mice. TET may effectively alleviate NP by reducing neuroinflammation and decreasing CKLF1.

中文翻译:


粉防己碱通过抑制脊髓 CKLF1 减轻 SNI 引起的机械异常性疼痛



神经性疼痛(NP)是一个普遍存在的临床问题,目前尚无令人满意的治疗方案。粉防己碱 (TET) 是一种从粉防己碱中提取的双苄基异喹啉生物碱,具有抗炎和免疫调节特性。已知趋化因子样因子 1 (CKLF1) 在外周和中枢炎症过程中发挥着至关重要的作用。本研究旨在探讨 TET 的潜在抗 NP 作用以及 CKLF1 在 TET 作用中的参与情况。建立雄性 C57BL/6J 小鼠免遭神经损伤 (SNI) 引起的 NP 模型,并使用 von Frey 丝测量机械撤退阈值。结果显示,TET改善了SNI小鼠的机械性异常性疼痛,异丙酚诱导的睡眠试验表明TET组没有表现出中枢抑制作用,而普瑞巴林(PGB)组则表现出明显的中枢抑制作用。 Western blotting和免疫荧光染色显示TET显着抑制脊髓中CKLF1、p-NF-κB/NF-κB、p-IKK/IKK、促炎细胞因子IL-1β和TNF-α的蛋白表达水平,并增加蛋白表达水平抗炎细胞因子 IL-10 的表达,同时抑制 SNI 小鼠小胶质细胞和星形胶质细胞标志物 IBA-1 和 GFAP 的表达水平。此外,免疫荧光双标记结果显示,CKLF1 主要与 SNI 小鼠脊髓 (SC) 的小胶质细胞共定位。 C19(CKLF1 的拮抗肽)可减轻 SNI 诱导的机械性疼痛过敏,而 C27(CKLF1 的类似肽)可在正常小鼠中诱导机械性异常性疼痛。 TET 显着减轻 C27 引起的小鼠机械异常性疼痛。 TET可以通过减少神经炎症和降低CKLF1来有效缓解NP。
更新日期:2023-07-28
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