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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;
                          2
                 1*
                                           3
                                  1
          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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                   1
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                                    2
          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 ·
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