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雷公藤甲素调节 cGAS/STING 信号通路对坐骨神经痛大鼠的改

          善作用及机制
                                Δ


                *
          闫改霞 ,林淑霞,孟 燕,张慧宇,景彦林(山西大同大学中医药健康服务学院,山西 大同 037009)
                                                #
          中图分类号  R965      文献标志码  A      文章编号  1001-0408(2024)13-1594-06
          DOI  10.6039/j.issn.1001-0408.2024.13.09

          摘   要  目的  探究雷公藤甲素(TP)对坐骨神经痛大鼠的改善作用及机制。方法  制备坐骨神经痛大鼠模型,然后将大鼠随机分
          为模型组(生理盐水),吲哚美辛组(阳性对照,7.5 mg/kg),低、高剂量TP干预组(分别记为TP-L组、TP-H组,50、100 μg/kg TP)和
          高剂量 TP+干扰素基因刺激因子(STING)激活剂干预组(TP-H+DMXAA 组,100 μg/kg TP+25 mg/kg DMXAA),每组 12 只;另取
          12只不结扎的大鼠作为假手术组(生理盐水)。腹腔注射给药/生理盐水14 d后,检测大鼠机械刺激缩足反射阈值(PWT)、热刺激
          缩足反射潜伏期(PWL);观察大鼠坐骨神经病理学改变、坐骨神经元形态及小胶质细胞数;检测大鼠坐骨神经中白细胞介素1β
         (IL-1β)、肿瘤坏死因子α(TNF-α)水平及环磷酸鸟苷-腺苷酸合成酶(cGAS)、STING mRNA及其蛋白表达。结果  与假手术组比
          较,Model组大鼠PWT、PWL均显著降低/缩短(P<0.05),尼氏体数量显著减少(P<0.05);小胶质细胞数、坐骨神经病理学评分,
          IL-1β、TNF-α水平,cGAS、STING mRNA及其蛋白表达水均显著增加/升高(P<0.05);坐骨神经损伤严重。与Model组比较,吲哚
          美辛组、TP-L组、TP-H组大鼠各指标变化与上述相反(P<0.05),坐骨神经损伤减轻。STING激活剂DMXAA减弱了TP对坐骨神
          经痛大鼠小胶质细胞活性和炎症反应的抑制作用(P<0.05)。结论 TP可能通过下调cGAS/STING信号通路,降低小胶质细胞活
          性和炎症反应,从而改善大鼠坐骨神经痛。
          关键词  雷公藤甲素;坐骨神经痛;cGAS/STING信号通路;小胶质细胞;炎症反应

          Improvement  effect  and  mechanism  of  triptolide  on  sciatica  rats  by  regulating  cGAS/STING  signaling
          pathway
          YAN Gaixia,LIN Shuxia,MENG Yan,ZHANG Huiyu,JING Yanlin(College  of  Traditional  Chinese  Medicine
          Health Service, Shanxi Datong University, Shanxi Datong 037009, China)

          ABSTRACT    OBJECTIVE To investigate the improvement effect and mechanism of triptolide (TP) on sciatica rats. METHODS
          Sciatica  rat  model  was  prepared  and  then  randomly  divided  into  model  group (normal  saline),  indomethacin  group (positive
          control,  7.5  mg/kg), TP  low-dose  and  high-dose  groups (TP-L  group  and TP-H  group,  50,  100  μg/kg TP),  and  high-dose TP+
          stimulator  of  interferon  gene (STING)  activator  group (TP-H+DMXAA  group,  100  μg/kg TP+25  mg/kg  DMXAA),  with  12  rats
          in  each  group. Another  12  unligated  rats  were  selected  as  sham  operation  group (normal  saline). After  14  days  of  intraperitoneal
          administration,  the  paw  mechanical  withdrawal  threshold (PWT)  and  paw  withdrawal  thermal  latency (PWL)  were  detected;  the
          pathological  changes,  morphology  of  sciatic  nerve  and  the  number  of  microglia  in  sciatic  nerve  were  observed.  The  levels  of
          interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α), mRNA and protein expression levels of cyclic guanosine monophosphate-
          adenosine  monophosphate  synthase (cGAS)  and  STING  in  sciatic  nerve  were  detected.  RESULTS  Compared  with  sham  operation
          group,  PWT  and  PWL  of  rats  in  model  group  were  obviously  reduced  and  shortened,  the  number  of  Nissl  bodies  was  obviously
          decreased,  while  the  number  of  microglia,  sciatic  neuropathology  score,  the  levels  of  IL-1β  and  TNF- α,  mRNA  and  protein
          expressions of cGAS and STING were obviously increased (P<0.05), and sciatic nerve injury was serious. Compared with model
          group, the changes of various indexes in indomethacin group, TP-L group and TP-H group were opposite to the above (P<0.05),
          and  sciatic  nerve  injury  was  reduced.  STING  activator  DMXAA  weakened  the  inhibitory  effect  of  TP  on  the  activity  of  microglia
          and inflammatory response in sciatica rats (P<0.05). CONCLUSIONS  TP may reduce the activity of microglia and inflammatory
          response by down-regulating the cGAS/STING signaling pathway, thus alleviating sciatica in rats.
          KEYWORDS     triptolide; sciatica; cGAS/STING signaling pathway; microglia; inflammation reaction

              Δ 基金项目 山 西 省 基 础 研 究 计 划(自 由 探 索 类)项 目(No.
          20210302123478)                                         坐骨神经痛是由于各种原因导致的坐骨神经通路
             *第一作者 讲师,副主任医师,硕士。研究方向:针刺临床及机                    及其分布区失调而引起的神经病理性疼痛,是临床常见
          制。E-mail:yangaixia2023@126.com
                                                                                     [1]
                                                              的症状,其发病率逐渐上升 。患者主要出现腰背部、臀
              # 通信作者 副教授,副主任医师,硕士。研究方向:针药结合治疗
          不孕症。E-mail:m13008080301@163.com                     部直至下肢的放射性疼痛,且这种疼痛可能会对患者的

          · 1594 ·    China Pharmacy  2024 Vol. 35  No. 13                            中国药房  2024年第35卷第13期
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