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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)
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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