中国神经再生研究(英文版) ›› 2024, Vol. 19 ›› Issue (7): 1532-1540.doi: 10.4103/1673-5374.385846

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

大动脉粥样硬化性脑卒中患者的出血转化与肠道微生物群及其代谢产物脂多糖有关

  


  • 出版日期:2024-07-15 发布日期:2023-11-28
  • 基金资助:
    国家重点研发计划项目;国家老年医学临床研究中心(湘雅医院)项目;国家自然科学基金

Hemorrhagic transformation in patients with large-artery atherosclerotic stroke is associated with the gut microbiota and lipopolysaccharide

Qin Huang1, 2, Minping Wei1, Xianjing Feng1, Yunfang Luo1, Yunhai Liu1, Jian Xia1, 3, 4, *   

  1. 1Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China; 2Department of Neurology, Peking University People’s Hospital, Beijing, China; 3Clinical Research Center for Cerebrovascular Disease of Hunan Province, Central South University, Changsha, Hunan Province, China; 4National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
  • Online:2024-07-15 Published:2023-11-28
  • Contact: Jian Xia, MD, xjian1216@csu.edu.cn.
  • Supported by:
    This study was supported by the National Key Research and Development Projects, Nos. 2022YFC3602400, 2022YFC3602401 (to JX); the Project Program of National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), No. 2020LNJJ16 (to JX); and the National Natural Science Foundation of China, No. 82271369 (to JX).

摘要:

出血转化是大动脉粥样硬化性脑卒中的主要并发症,会恶化预后并增加死亡率。肠道微生物群的破坏是脑卒中的一个重要特征,而一些特殊细菌与细菌代谢产物的结合可能会参与脑卒中的发病机制。为了解大动脉粥样硬化性脑卒中患者肠道微生物群与出血转化间的关系,开展了一项观察性回顾研究,该研究于2020 年 5 月至 2021 年 9 月纳入48名参与者,其中急性大动脉粥样硬化型卒中患者伴有出血转化15例(HT组),卒中后无出血转化17例(非HT组),以及由16名年龄性别相匹配的受试者作为健康对照组(HC组)。应用 16s 核糖体核糖核酸(rRNA)序列评估肠道微生物群。同时,还研究了脂多糖通路的关键成分:脂多糖、脂多糖结合蛋白和溶质CD14。结果发现,与健康对照组相比,HT组和non-HT组的细菌多样性都有所减少。HT 的缺血性脑卒中患者的肠道微生物群组成不同,尤其是肠杆菌科成员的相对丰度和多样性增加。与非 HT 组相比,HT 组血浆脂多糖和脂多糖结合蛋白水平更高。脂多糖、脂多糖结合蛋白和溶质CD14的浓度与肠杆菌的数量增加有关。为了确定肠道菌群和脂多糖相关炎症反应在HT中的作用,构建了梗死后出血转化大鼠模型,并进行了粪菌移植实验。结果发现,相对于移植无出血转化供体的肠道菌群而言,移植出血转化供体的肠道菌群可以增加受体大鼠的梗死体积和加重出血转化严重程度。出血转化供体来源的微生物群使受体大鼠血浆中存在较高水平的脂多糖,脂多糖结合蛋白和溶质CD14。这表明,梗死后出血转化促进肠道菌群紊乱,使肠杆菌科相对丰度升高,致病代谢产物脂多糖增加,肠脑屏障受损,这可能是影响梗死后出血转化发生的重要因素。该研究为脑梗死后出血转化提供了可能的作用靶点。

https://orcid.org/0000-0001-9154-131X (Jian Xia)


Abstract: Hemorrhagic transformation is a major complication of large-artery atherosclerotic stroke (a major ischemic stroke subtype) that worsens outcomes and increases mortality. Disruption of the gut microbiota is an important feature of stroke, and some specific bacteria and bacterial metabolites may contribute to hemorrhagic transformation pathogenesis. We aimed to investigate the relationship between the gut microbiota and hemorrhagic transformation in large-artery atherosclerotic stroke. An observational retrospective study was conducted. From May 2020 to September 2021, blood and fecal samples were obtained upon admission from 32 patients with first-ever acute ischemic stroke and not undergoing intravenous thrombolysis or endovascular thrombectomy, as well as 16 healthy controls. Patients with stroke who developed hemorrhagic transformation (n = 15) were compared to those who did not develop hemorrhagic transformation (n = 17) and with healthy controls. The gut microbiota was assessed through 16S ribosomal ribonucleic acid sequencing. We also examined key components of the lipopolysaccharide pathway: lipopolysaccharide, lipopolysaccharide-binding protein, and soluble CD14. We observed that bacterial diversity was decreased in both the hemorrhagic transformation and non-hemorrhagic transformation group compared with the healthy controls. The patients with ischemic stroke who developed hemorrhagic transformation exhibited altered gut microbiota composition, in particular an increase in the relative abundance and diversity of members belonging to the Enterobacteriaceae family. Plasma lipopolysaccharide and lipopolysaccharide-binding protein levels were higher in the hemorrhagic transformation group compared with the non-hemorrhagic transformation group. lipopolysaccharide, lipopolysaccharide-binding protein, and soluble CD14 concentrations were associated with increased abundance of Enterobacteriaceae. Next, the role of the gut microbiota in hemorrhagic transformation was evaluated using an experimental stroke rat model. In this model, transplantation of the gut microbiota from hemorrhagic transformation rats into the recipient rats triggered higher plasma levels of lipopolysaccharide, lipopolysaccharide-binding protein, and soluble CD14. Taken together, our findings demonstrate a noticeable change in the gut microbiota and lipopolysaccharide-related inflammatory response in stroke patients with hemorrhagic transformation. This suggests that maintaining a balanced gut microbiota may be an important factor in preventing hemorrhagic transformation after stroke.

Key words: gut microbiota, hemorrhagic transformation, inflammation, lipopolysaccharide, stroke