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灯盏花乙素调节 cGAS/STING 信号通路对创伤性脑损伤大鼠神
经炎症的影响
Δ
宋 宇 ,宋明明 ,魏志玄 ,王海均(1.南阳医学高等专科学校第一附属医院神经外科,河南 南阳 473000;
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1*
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2.南阳医学高等专科学校第三附属医院神经外科,河南 南阳 473007;3.华中科技大学协和医院神经外科,
武汉 430022)
中图分类号 R965 文献标志码 A 文章编号 1001-0408(2023)17-2107-06
DOI 10.6039/j.issn.1001-0408.2023.17.11
摘 要 目的 探讨灯盏花乙素(Scu)改善创伤性脑损伤(TBI)大鼠神经炎症的作用及机制。方法 采用改良Feeney法构建TBI大
鼠模型。将成模大鼠随机分为TBI组、Scu低剂量组(40 mg/kg)、Scu高剂量组(80 mg/kg)和环鸟苷酸-腺苷酸合成酶(cGAS)抑制
剂组(cGAS抑制剂RU.521,450 μg/kg),每组24只;另取24只大鼠作为假手术组。采用改良神经功能缺损评分(mNSS)法评估大
鼠神经功能;以干/湿比重法测定大鼠脑含水量;以苏木素-伊红、原位末端标记染色法观察大鼠脑组织病理学变化和细胞凋亡情
况;采用酶联免疫吸附检测法测定大鼠脑组织中β干扰素(IFN-β)、CXC趋化因子配体10(CXCL10)、肿瘤坏死因子α(TNF-α)、白
细胞介素 6(IL-6)含量;以 Western blot 法检测大鼠脑组织中 cGAS/干扰素基因刺激蛋白(STING)信号通路相关蛋白的表达情
况。结果 与假手术组比较,TBI 组大鼠的 mNSS,脑含水量,脑组织细胞凋亡率,IFN-β、CXCL10、TNF-α、IL-6 含量和 cGAS、
STING蛋白相对表达水平均显著升高(P<0.05);脑组织存在水肿、出血、神经元病理学损伤。与TBI组比较,各给药组大鼠的上
述指标及病理变化均显著改善(P<0.05),且Scu的作用具有剂量依赖性(P<0.05),而Scu高剂量组和cGAS抑制剂组大鼠上述指
标比较差异均无统计学意义(P>0.05)。结论 Scu可能通过抑制cGAS/STING信号通路激活来减轻TBI大鼠神经炎症,减少其脑
组织损伤及细胞凋亡,促进其神经功能恢复。
关键词 灯盏花乙素;创伤性脑损伤;神经炎症;环鸟苷酸-腺苷酸合成酶;干扰素基因刺激蛋白
Effects of scutellarin on neuroinflammation in rats with traumatic brain injury by regulating cGAS/STING
signaling pathway
SONG Yu ,SONG Mingming ,WEI Zhixuan ,WANG Haijun(1. Dept. of Neurosurgery,the First Affiliated
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Hospital of Nanyang Medical College,Henan Nanyang 473000,China;2. Dept. of Neurosurgery,the Third
Affiliated Hospital of Nanyang Medical College,Henan Nanyang 473007,China;3. Dept. of Neurosurgery,the
Union Hospital of Huazhong University of Science and Technology,Wuhan 430022,China)
ABSTRACT OBJECTIVE To investigate the improvement effects and mechanism of scutellarin (Scu) on neuroinflammation in
rats with traumatic brain injury (TBI). METHODS The modified Feeney method was applied to construct TBI rat model. The rats
were randomly grouped into TBI group,Scu low-dose group (40 mg/kg),Scu high-dose group (80 mg/kg),cyclic guanylate-
adenylate synthase (cGAS) inhibitor group (cGAS inhibitor RU.521,450 μg/kg),with 24 rats in each group. Other 24 rats were
included in the sham operation group. The modified neurological deficit score (mNSS) method was applied to assess the
neurological function of rats; the brain water content of rats was measured by dry/wet specific gravity method; hematoxylin-eosin
and TdT-mediated dUTP nick-end labeling staining were applied to observe the pathological changes and apoptosis of brain tissue in
rats; the levels of interferon-β (IFN-β),CXC chemokine ligand-10 (CXCL10),tumor necrosis factor-α (TNF-α) and interleukin-6
(IL-6) in rat brain tissue were detected by enzyme-linked immunosorbent assay; Western blot method was applied to detect the
expression of cGAS/interferon gene stimulating protein (STING) signal pathway-related proteins in brain tissue of rats. RESULTS
Compared with the sham operation group,the mNSS,brain water content,apoptosis rate,the contents of IFN-β,CXCL10,TNF-α
and IL-6,and the relative expressions of cGAS and STING proteins in TBI group increased significantly (P<0.05); there were
edema,bleeding and pathological damage to neurons in the brain tissue. Compared with TBI group,the above indicators and
pathological changes of rats in administration groups were improved significantly (P<0.05),and the effect of Scu was in a dose-
dependent manner (P<0.05); however,there was no statistically obvious difference in the above indicators between the Scu high-
dose group and the cGAS inhibitor group (P>0.05).
Δ 基金项目 河南省医学教育研究项目(No.Wjlx2020483)
*第一作者 主任医师,硕士。研究方向:神经外科、脑肿瘤、脑外 CONCLUSIONS Scu may alleviate neuroinflammation,reduce
伤、脑出血。电话:0377-62238711。E-mail:13683927543@163.com brain tissue damage and apoptosis,and promote the recovery of
中国药房 2023年第34卷第17期 China Pharmacy 2023 Vol. 34 No. 17 · 2107 ·