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iPLA2β loss leads to age-related cognitive decline and neuroinflammation by disrupting neuronal mitophagy iPLA2β 的缺失会破坏神经元的有丝分裂,从而导致与年龄相关的认知能力下降和神经炎症
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-18 DOI: 10.1186/s12974-024-03219-z
Li Jiao, Wenxin Shao, Wenqi Quan, Longjiang Xu, Penghui Liu, Jinling Yang, Xiaozhong Peng
During brain aging, disturbances in neuronal phospholipid metabolism result in impaired cognitive function and dysregulation of neurological processes. Mutations in iPLA2β are associated with neurodegenerative conditions that significantly impact brain phospholipids. iPLA2β deficiency exacerbates mitochondrial dysfunction and abnormal mitochondrial accumulation. We hypothesized that iPLA2β contributes to age-related cognitive decline by disrupting neuronal mitophagy. We used aged wild-type (WT) mice and iPLA2β−/− mice as natural aging models to assess cognitive performance, iPLA2β expression in the cortex, levels of chemokines and inflammatory cytokines, and mitochondrial dysfunction, with a specific focus on mitophagy and the mitochondrial phospholipid profile. To further elucidate the role of iPLA2β, we employed adeno-associated virus (AAV)-mediated iPLA2β overexpression in aged mice and re-evaluated these parameters. Our findings revealed a significant reduction in iPLA2β levels in the prefrontal cortex of aged brains. Notably, iPLA2β-deficient mice exhibited impaired learning and memory. Loss of iPLA2β in the PFC of aged mice led to increased levels of chemokines and inflammatory cytokines. This damage was associated with altered mitochondrial morphology, reduced ATP levels due to dysregulation of the parkin-independent mitophagy pathway, and changes in the mitochondrial phospholipid profile. AAV-mediated overexpression of iPLA2β alleviated age-related parkin-independent mitophagy pathway dysregulation in primary neurons and the PFC of aged mice, reduced inflammation, and improved cognitive function. Our study suggests that age-related iPLA2β loss in the PFC leads to cognitive decline through the disruption of mitophagy. These findings highlight the potential of targeting iPLA2β to ameliorate age-related neurocognitive disorders.
在大脑衰老过程中,神经元磷脂代谢紊乱会导致认知功能受损和神经过程失调。iPLA2β的突变与神经退行性疾病有关,这些疾病对脑磷脂有重大影响。iPLA2β的缺乏会加剧线粒体功能障碍和线粒体的异常积累。我们假设,iPLA2β 通过破坏神经元的有丝分裂而导致与年龄相关的认知能力下降。我们使用老龄野生型(WT)小鼠和 iPLA2β-/- 小鼠作为自然衰老模型,评估认知能力、皮层中 iPLA2β 的表达、趋化因子和炎症细胞因子的水平以及线粒体功能障碍,并特别关注有丝分裂吞噬和线粒体磷脂谱。为了进一步阐明 iPLA2β 的作用,我们采用了腺相关病毒(AAV)介导的 iPLA2β 在老年小鼠中的过表达,并重新评估了这些参数。我们的研究结果表明,老龄大脑前额叶皮层中的 iPLA2β 水平明显下降。值得注意的是,iPLA2β缺陷小鼠的学习和记忆能力受损。老龄小鼠前额叶皮质中 iPLA2β 的缺失导致趋化因子和炎症细胞因子水平升高。这种损伤与线粒体形态的改变、帕金不依赖的有丝分裂途径失调导致的 ATP 水平降低以及线粒体磷脂谱的变化有关。AAV介导的iPLA2β过表达缓解了原发性神经元和老年小鼠PFC中与年龄相关的帕金依赖性有丝分裂途径失调,减少了炎症并改善了认知功能。我们的研究表明,与年龄相关的iPLA2β在PFC中的缺失会通过破坏有丝分裂而导致认知功能下降。这些发现凸显了以 iPLA2β 为靶点改善与年龄相关的神经认知障碍的潜力。
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引用次数: 0
Characterization of the angiomodulatory effects of Interleukin 11 cis- and trans-signaling in the retina 白细胞介素 11 顺式和反式信号在视网膜中的血管调节作用特征
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-18 DOI: 10.1186/s12974-024-03223-3
Paula Liang, Jan Ness, Julian Rapp, Stefaniya Boneva, Melanie Schwämmle, Malte Jung, Günther Schlunck, Hansjürgen Agostini, Felicitas Bucher
The IL-6 cytokine family, with its crucial and pleiotropic intracellular signaling pathway STAT3, is a promising target for treating vasoproliferative retinal diseases. Previous research has shown that IL-6 cis-signaling (via membrane-bound receptors) and trans-signaling (via soluble receptors) can have distinct effects on target cells, leading to their application in various disease treatments. While IL-6 has been extensively studied, less is known about the angiogenic effects of IL-11, another member of the IL-6 family, in the retina. Therefore, the aim of this study was to characterize the effects of IL-11 on retinal angiogenesis. In vitreous samples from proliferative diabetic retinopathy (PDR) patients, elevated levels of IL-11Rα, but not IL-11, were detected. In vitro studies using vascular endothelial cells revealed distinct effects of cis- and trans-signaling: cis-signaling (IL-11 alone) had antiangiogenic effects, while trans-signaling (IL-11 + sIL-11Rα) had proangiogenic and pro-migratory effects. These differences can be attributed to their individual signaling responses and associated transcriptomic changes. Notably, no differences in cis- and trans-signaling were detected in primary mouse Müller cell cultures. STAT3 and STAT1 siRNA knockdown experiments revealed opposing effects on IL-11 signaling, with STAT3 functioning as an antiproliferative and proapoptotic player while STAT1 acts in opposition to STAT3. In vivo, both IL-11 and IL-11 + sIL-11Rα led to a reduction in retinal neovascularization. Immunohistochemical staining revealed Müller cell activation in response to treatment, suggesting that IL-11 affects multiple retinal cell types in vivo beyond vascular endothelial cells. Cis- and trans-signaling by IL-11 have contrasting angiomodulatory effects on endothelial cells in vitro. In vivo, cis- and trans-signaling also influence Müller cells, ultimately determining the overall angiomodulatory impact on the retina, highlighting the intricate interplay between vascular and glial cells in the retina.
IL-6细胞因子家族及其关键的多效应细胞内信号通路STAT3是治疗血管增生性视网膜疾病的一个很有前景的靶点。先前的研究表明,IL-6 顺信号(通过膜结合受体)和跨信号(通过可溶性受体)可对靶细胞产生不同的影响,从而将其应用于各种疾病的治疗。虽然 IL-6 已被广泛研究,但人们对 IL-6 家族的另一成员 IL-11 在视网膜中的血管生成作用却知之甚少。因此,本研究的目的是鉴定 IL-11 对视网膜血管生成的影响。在增殖性糖尿病视网膜病变(PDR)患者的玻璃体样本中,检测到 IL-11Rα 水平升高,但未检测到 IL-11。利用血管内皮细胞进行的体外研究显示,顺式信号和反式信号具有不同的作用:顺式信号(仅IL-11)具有抗血管生成作用,而反式信号(IL-11 + sIL-11Rα)具有促血管生成和促迁移作用。这些差异可归因于它们各自的信号反应和相关的转录组变化。值得注意的是,在原代小鼠 Müller 细胞培养物中没有检测到顺式信号转导和反式信号转导的差异。STAT3和STAT1 siRNA敲除实验显示了对IL-11信号转导的相反作用,STAT3起着抗增殖和促凋亡的作用,而STAT1的作用则与STAT3相反。在体内,IL-11和IL-11+sIL-11Rα都会导致视网膜新生血管减少。免疫组化染色显示,Müller细胞在治疗过程中被激活,这表明IL-11在体内影响着血管内皮细胞以外的多种视网膜细胞类型。在体外,IL-11的顺式信号传导和反式信号传导对内皮细胞的血管调节作用截然不同。在体内,顺式信号转导和反式信号转导也会影响Müller细胞,最终决定对视网膜的整体血管调节作用,这凸显了视网膜中血管细胞和神经胶质细胞之间错综复杂的相互作用。
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引用次数: 0
The regulation of NFKB1 on CD200R1 expression and their potential roles in Parkinson’s disease NFKB1 对 CD200R1 表达的调控及其在帕金森病中的潜在作用
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-18 DOI: 10.1186/s12974-024-03231-3
Suzhen Lin, Yimei Shu, Ruinan Shen, Yifan Zhou, Hong Pan, Lu He, Fang Fang, Xue Zhu, Xinrui Wang, Ying Wang, Wei Xu, Jianqing Ding
Overactivated microglia are a key contributor to Parkinson’s disease (PD) by inducing neuroinflammation. CD200R1, a membrane glycoprotein mainly found on microglia, is crucial for maintaining quiescence with its dysregulation linked to microglia’s abnormal activation. We and other groups have reported a decline in CD200R1 levels in several neurological disorders including PD. However, the mechanism regulating CD200R1 expression and the specific reasons for its reduction in PD remain largely unexplored. Given the pivotal role of transcription factors in gene expression, this study aimed to elucidate the transcriptional regulation of CD200R1 and its implications in PD. The CD200R1 promoter core region was identified via luciferase assays. Potential transcription factors were predicted using the UCSC ChIP-seq database and JASPAR. NFKB1 binding to the CD200R1 core promoter was substantiated through electrophoretic mobility shift and chromatin immunoprecipitation assays. Knocking-down or overexpressing NFKB1 validated its regulatory effect on CD200R1. Correlation between decreased CD200R1 and deficient NFKB1 was studied using Genotype-Tissue Expression database. The clinical samples of the peripheral blood mononuclear cells were acquired from 44 PD patients (mean age 64.13 ± 9.78, 43.2% male, median Hoehn-Yahr stage 1.77) and 45 controls (mean age 64.70 ± 9.41, 52.1% male). NFKB1 knockout mice were utilized to study the impact of NFKB1 on CD200R1 expression and to assess their roles in PD pathophysiology. The study identified the CD200R1 core promoter region, located 482 to 146 bp upstream of its translation initiation site, was directly regulated by NFKB1. Significant correlation between NFKB1 and CD200R1 expression was observed in human PMBCs. Both NFKB1 and CD200R1 were significantly decreased in PD patient samples. Furthermore, NFKB1-/- mice exhibited exacerbated microglia activation and dopaminergic neuron loss after 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) treatment. Our study identified that NFKB1 served as a direct regulator of CD200R1. Reduced NFKB1 played a critical role in CD200R1 dysregulation and subsequent microglia overactivation in PD. These findings provide evidence that targeting the NFKB1-CD200R1 axis would be a novel therapeutic strategy for PD.
过度激活的小胶质细胞会诱发神经炎症,是导致帕金森病(PD)的一个关键因素。CD200R1是一种主要存在于小胶质细胞上的膜糖蛋白,对维持静止状态至关重要,其失调与小胶质细胞的异常激活有关。我们和其他研究小组已经报道了包括帕金森病在内的多种神经系统疾病中 CD200R1 水平的下降。然而,CD200R1表达的调控机制及其在帕金森病中下降的具体原因在很大程度上仍未得到探讨。鉴于转录因子在基因表达中的关键作用,本研究旨在阐明CD200R1的转录调控及其在帕金森病中的影响。通过荧光素酶实验确定了CD200R1启动子核心区域。利用 UCSC ChIP-seq 数据库和 JASPAR 预测了潜在的转录因子。通过电泳迁移和染色质免疫沉淀实验证实了NFKB1与CD200R1核心启动子的结合。敲除或过表达 NFKB1 验证了其对 CD200R1 的调控作用。利用基因型-组织表达数据库研究了 CD200R1 减少与 NFKB1 缺乏之间的相关性。临床外周血单核细胞样本来自44名帕金森病患者(平均年龄为64.13±9.78岁,男性占43.2%,Hoehn-Yahr分期中位数为1.77期)和45名对照组患者(平均年龄为64.70±9.41岁,男性占52.1%)。研究人员利用NFKB1基因敲除小鼠研究NFKB1对CD200R1表达的影响,并评估其在帕金森病病理生理学中的作用。研究发现,CD200R1核心启动子区位于其翻译起始位点上游482至146 bp处,受NFKB1直接调控。在人PMBCs中观察到NFKB1和CD200R1的表达存在显著相关性。在帕金森病患者样本中,NFKB1和CD200R1的表达量均明显下降。此外,1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)治疗后,NFKB1-/-小鼠表现出加剧的小胶质细胞激活和多巴胺能神经元丢失。我们的研究发现,NFKB1 是 CD200R1 的直接调节因子。NFKB1 的减少在 CD200R1 失调和随后的帕金森病小胶质细胞过度激活中起着关键作用。这些发现为靶向 NFKB1-CD200R1 轴将成为治疗帕金森病的新策略提供了证据。
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引用次数: 0
Microenvironmental regulation of tumor-associated neutrophils in malignant glioma: from mechanism to therapy 恶性胶质瘤中肿瘤相关中性粒细胞的微环境调控:从机制到治疗
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-16 DOI: 10.1186/s12974-024-03222-4
Jiayi Wen, Dan Liu, Hongtao Zhu, Kai Shu
Glioma is the most common primary intracranial tumor in adults, with high incidence, recurrence, and mortality rates. Tumor-associated neutrophils (TANs) are essential components of the tumor microenvironment (TME) in glioma and play a crucial role in glioma cell proliferation, invasion and proneural-mesenchymal transition. Besides the interactions between TANs and tumor cells, the multi-dimensional crosstalk between TANs and other components within TME have been reported to participate in glioma progression. More importantly, several therapies targeting TANs have been developed and relevant preclinical and clinical studies have been conducted in cancer therapy. In this review, we introduce the origin of TANs and the functions of TANs in malignant behaviors of glioma, highlighting the microenvironmental regulation of TANs. Moreover, we focus on summarizing the TANs-targeted methods in cancer therapy, aiming to provide insights into the mechanisms and therapeutic opportunities of TANs in the malignant glioma microenvironment.
胶质瘤是成人最常见的原发性颅内肿瘤,发病率、复发率和死亡率都很高。肿瘤相关中性粒细胞(TANs)是胶质瘤肿瘤微环境(TME)的重要组成部分,在胶质瘤细胞增殖、侵袭和软骨-间质转化中起着至关重要的作用。除了TANs与肿瘤细胞之间的相互作用外,有报道称TANs与TME内其他成分之间的多维串扰也参与了胶质瘤的进展。更重要的是,一些针对 TANs 的疗法已经开发出来,相关的临床前和临床研究也已在癌症治疗中展开。在这篇综述中,我们将介绍 TANs 的起源以及 TANs 在胶质瘤恶性行为中的功能,重点介绍 TANs 的微环境调控。此外,我们还重点总结了以TANs为靶点的癌症治疗方法,旨在深入探讨TANs在恶性胶质瘤微环境中的作用机制和治疗机会。
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引用次数: 0
Microglia mediate memory dysfunction via excitatory synaptic elimination in a fracture surgery mouse model 在骨折手术小鼠模型中,小胶质细胞通过兴奋性突触消除介导记忆功能障碍
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-16 DOI: 10.1186/s12974-024-03216-2
Shuming Li, Huan Liu, Pin Lv, Yu Yao, Liangyu Peng, Tianjiao Xia, Chao Yan, Zhengliang Ma, Zhang-Peng Chen, Chunjie Zhao, Xiaoping Gu
Cognitive impairment is a common issue among human patients undergoing surgery, yet the neural mechanism causing this impairment remains unidentified. Surgical procedures often lead to glial cell activation and neuronal hypoexcitability, both of which are known to contribute to postoperative cognitive dysfunction (POCD). However, the role of neuron-glia crosstalk in the pathology of POCD is still unclear. Through integrated transcriptomics and proteomics analyses, we found that the complement cascades and microglial phagocytotic signaling pathways are activated in a mouse model of POCD. Following surgery, there is a significant increase in the presence of complement C3, but not C1q, in conjunction with presynaptic elements. This triggers a reduction in excitatory synapses, a decline in excitatory synaptic transmission, and subsequent memory deficits in the mouse model. By genetically knockout out C3ar1 or inhibiting p-STAT3 signaling, we successfully prevented neuronal hypoexcitability and alleviated cognitive impairment in the mouse model. Therefore, targeting the C3aR and downstream p-STAT3 signaling pathways could serve as potential therapeutic approaches for mitigating POCD.
认知功能障碍是接受外科手术的人类患者的常见问题,但导致这种障碍的神经机制仍未确定。外科手术通常会导致神经胶质细胞活化和神经元兴奋性降低,而这两种情况都是导致术后认知功能障碍(POCD)的原因。然而,神经元-胶质细胞串扰在 POCD 病理学中的作用仍不清楚。通过综合转录组学和蛋白质组学分析,我们发现补体级联和小胶质细胞吞噬信号通路在 POCD 小鼠模型中被激活。手术后,与突触前元件结合的补体 C3(而非 C1q)显著增加。这引发了兴奋性突触的减少、兴奋性突触传递的下降以及小鼠模型随后出现的记忆障碍。通过基因敲除 C3ar1 或抑制 p-STAT3 信号转导,我们成功地防止了小鼠模型中神经元的低兴奋性并缓解了认知障碍。因此,靶向 C3aR 和下游 p-STAT3 信号通路可作为缓解 POCD 的潜在治疗方法。
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引用次数: 0
Multiomics integrated analysis and experimental validation identify TLR4 and ALOX5 as oxidative stress-related biomarkers in intracranial aneurysms 多组学综合分析和实验验证发现 TLR4 和 ALOX5 是颅内动脉瘤中与氧化应激相关的生物标记物
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-15 DOI: 10.1186/s12974-024-03226-0
Lvyin Luo, Xinlong Ma, Debin Kong, Yuxiang Dai, Tao Li, Han Yu, Jingzheng Liu, Maogui Li, Yangyang Xu, Guo Xiang, Zhimin Zhao, Weiying Zhong, Donghai Wang, Yunyan Wang
Intracranial aneurysm (IA) is a severe cerebrovascular disease, and effective gene therapy and drug interventions for its treatment are still lacking. Oxidative stress (OS) is closely associated with the IA, but the key regulatory genes involved are still unclear. Through multiomics analysis and experimental validation, we identified two diagnostic markers for IA associated with OS. In this study, we first analyzed the IA dataset GSE75436 and conducted a joint analysis of oxidative stress-related genes (ORGs). Differential analysis, functional enrichment analysis, immune infiltration, WGCNA, PPI, LASSO, and other methods were used to identify IA diagnostic markers related to OS. Next, the functions of TLR4 and ALOX5 expression in IA and their potential targeted therapeutic drugs were analyzed. We also performed single-cell sequencing of patient IA and control (superficial temporal artery, STA) tissues. 23,342 cells were captured from 2 IA and 3 STA samples obtained from our center. Cell clustering and annotation were conducted using R software to observe the distribution of TLR4 and ALOX5 expression in IAs. Finally, the expression of TLR4 and ALOX5 were validated in IA patients and in an elastase-induced mouse IA model using experiments such as WB and immunofluorescence. Through bioinformatics analysis, we identified 16 key ORGs associated with IA pathogenesis. Further screening revealed that ALOX5 and TLR4 were highly expressed to activate a series of inflammatory responses and reduce the production of myocytes. Methotrexate (MTX) may be a potential targeted drug. Single-cell analysis revealed a notable increase in immune cells in the IA group, with ALOX5 and TLR4 primarily localized to monocytes/macrophages. Validation through patient samples and mouse models confirmed high expression of ALOX5 and TLR4 in IAs. Bioinformatics analysis indicated that ALOX5 and TLR4 are the most significant ORGs associated with the pathogenesis of IA. Single-cell sequencing and experiments revealed that the high expression of ALOX5 and TLR4 are closely related to IA. These two genes are promising new targets for IA therapy.
颅内动脉瘤(IA)是一种严重的脑血管疾病,目前仍缺乏有效的基因疗法和药物干预来治疗这种疾病。氧化应激(OS)与颅内动脉瘤密切相关,但其中的关键调控基因仍不清楚。通过多组学分析和实验验证,我们发现了两个与OS相关的IA诊断标志物。在这项研究中,我们首先分析了 IA 数据集 GSE75436,并对氧化应激相关基因(ORGs)进行了联合分析。我们采用了差异分析、功能富集分析、免疫浸润、WGCNA、PPI、LASSO 等方法来确定与 OS 相关的 IA 诊断标记。接着,我们分析了TLR4和ALOX5在IA中的表达功能及其潜在的靶向治疗药物。我们还对患者IA和对照组(颞浅动脉,STA)组织进行了单细胞测序。我们从本中心获得的 2 个 IA 和 3 个 STA 样本中捕获了 23342 个细胞。使用 R 软件对细胞进行聚类和注释,以观察 TLR4 和 ALOX5 在 IA 中的表达分布。最后,通过WB和免疫荧光等实验验证了TLR4和ALOX5在IA患者和弹性蛋白酶诱导的小鼠IA模型中的表达。通过生物信息学分析,我们确定了 16 个与 IA 发病机制相关的关键 ORGs。进一步筛选发现,ALOX5 和 TLR4 高度表达,可激活一系列炎症反应并减少肌细胞的生成。甲氨蝶呤(MTX)可能是一种潜在的靶向药物。单细胞分析显示,IA 组免疫细胞明显增加,ALOX5 和 TLR4 主要定位于单核细胞/巨噬细胞。通过患者样本和小鼠模型验证,证实了ALOX5和TLR4在IAs中的高表达。生物信息学分析表明,ALOX5和TLR4是与IA发病机制相关的最重要的ORG。单细胞测序和实验显示,ALOX5和TLR4的高表达与IA密切相关。这两个基因有望成为治疗内脏癌的新靶点。
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引用次数: 0
The extracellular vesicle of depressive patient-derived Escherichia fergusonii induces vagus nerve-mediated neuroinflammation in mice 源于抑郁症患者的弗氏菌细胞外囊泡诱导小鼠迷走神经介导的神经炎症
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-14 DOI: 10.1186/s12974-024-03211-7
Xiaoyang Ma, Hee-Seo Park, Yoon-Jung Shin, Jeon-Kyung Kim, Jung Kyung Hong, Seung-Won Han, In-Young Yoon, Dong-Hyun Kim
Gut microbiota dysbiosis is closely associated with psychiatric disorders such as depression and anxiety (DA). In our preliminary study, fecal microbiota transplantation from volunteers with psychological stress and subclinical symptoms of depression (Vsd) induced DA-like behaviors in mice. Escherichia fergusonii (Esf) was found to be more abundant in the feces of Vsd compared to healthy volunteers. Therefore, we investigated the effect of Esf on DA-like behavior and neuroinflammation in mice with and without celiac vagotomy. Orally gavaged Esf increased DA-like behaviors, tumor necrosis factor (TNF)-α, and toll-like receptor-4 (TLR4) expression, and NF-κB+Iba1+ and lipopolysaccharide (LPS)+Iba1+ cell populations, while decreasing serotonin, 5-HT1A receptor, and brain-derived neurotrophic factor (BDNF) expression in the hippocampus and prefrontal cortex. However, celiac vagotomy attenuated Esf-induced DA-like behavior and neuroinflammation. Orally gavaged extracellular vesicle (EV) from Vsd feces (vfEV) or Esf culture (esEV) induced DA-like behavior and inflammation in hippocampus, prefrontal cortex and colon. However, celiac vagotomy attenuated vfEV- or esEV-induced DA-like behaviors and inflammation in the brain alone, while vfEV- or esEV-induced blood LPS and TNF-α levels, colonic TNF-α expression and NF-κB-positive cell number, and fecal LPS level were not. Although orally gavaged fluorescence isothiocyanate-labeled esEV was translocated into the blood and hippocampus, celiac vagotomy decreased its translocation into the hippocampus alone. esEVs may be translocated into the brain via the vagus nerve and bloodstream, subsequently inducing TNF-α expression and suppressing serotonin, its receptor, and BDNF expression through the activation of TLR4-mediated NF-κB signaling, thereby contributing to DA pathogenesis.
肠道微生物群失调与抑郁症和焦虑症(DA)等精神疾病密切相关。在我们的初步研究中,将有心理压力和亚临床抑郁症状的志愿者(Vsd)的粪便微生物群移植到小鼠体内会诱发类似抑郁症的行为。研究发现,与健康志愿者相比,Vsd 粪便中的弗氏大肠杆菌(Esf)含量更高。因此,我们研究了Esf对乳糜泻小鼠DA样行为和神经炎症的影响。口服Esf增加了小鼠的DA样行为、肿瘤坏死因子(TNF)-α和toll样受体-4(TLR4)的表达、NF-κB+Iba1+和脂多糖(LPS)+Iba1+细胞群,同时降低了海马和前额叶皮层中血清素、5-HT1A受体和脑源性神经营养因子(BDNF)的表达。然而,腹腔迷走神经切断术可减轻Esf诱导的DA样行为和神经炎症。口服来自Vsd粪便(vfEV)或Esf培养物(esEV)的细胞外囊泡(EV)可诱导海马、前额叶皮质和结肠的DA样行为和炎症。然而,腹腔迷走神经切断术可单独减轻vfEV或esEV诱导的大脑DA样行为和炎症,而vfEV或esEV诱导的血液LPS和TNF-α水平、结肠TNF-α表达和NF-κB阳性细胞数量以及粪便LPS水平则没有减轻。虽然口服异硫氰酸荧光标记的 esEV 可转运到血液和海马中,但腹腔迷走神经切断术仅减少了其在海马中的转运。esEV可能通过迷走神经和血液转运到大脑,随后通过激活TLR4介导的NF-κB信号,诱导TNF-α的表达,抑制5-羟色胺、其受体和BDNF的表达,从而导致DA发病。
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引用次数: 0
Targeting the NLRP3 inflammasome in cochlear macrophages protects against hearing loss in chronic suppurative otitis media 靶向耳蜗巨噬细胞中的 NLRP3 炎性体可预防慢性化脓性中耳炎患者的听力损失
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-14 DOI: 10.1186/s12974-024-03212-6
Viktoria Schiel, Ritwija Bhattacharya, Ankur Gupta, Kourosh Eftekharian, Anping Xia, Peter L Santa Maria
The activation of the NLRP3 inflammasome has been linked to several inflammatory and autoinflammatory diseases. Despite cases of potential hearing improvement in immune-mediated diseases, direct evidence of the efficacy of targeting this mechanism in the inner ear is still lacking. Previously, we discovered that macrophages are associated with Sensorineural Hearing loss (SNHL) in Chronic Suppurative Otitis Media (CSOM), the leading cause of this permanent hearing loss in the developing world and incurring costs of $4 to $11 billion dollars in the United States. However, the underlying mechanism remained unknown. Here, we investigate how macrophages drive permanent hearing loss in CSOM. We first confirmed the occurrence of NLRP3 inflammasome activation in cochlear macrophages in CSOM. We then revealed that Outer Hair Cells (OHCs) were protected in CSOM by macrophage depletion and subsequently confirmed the same protection in the NLRP3 knockout condition. Furthermore, we showed that therapeutic inhibition of NLRP3 inflammasome activation and downstream inhibition of IL-1β protects OHCs in CSOM. Collectively, our data demonstrates that the main driver for hearing loss in CSOM is NLRP3 inflammasome activation in cochlear macrophages and this is therapeutically targetable, leading the way for the development of interventions to prevent the leading cause of permanent hearing loss and a costly disease in the developed world.
NLRP3 炎性体的激活与多种炎症和自身炎症疾病有关。尽管在免疫介导的疾病中存在潜在的听力改善病例,但仍缺乏直接证据证明针对内耳中这一机制的疗效。在此之前,我们发现巨噬细胞与慢性化脓性中耳炎(CSOM)中的感音神经性听力损失(SNHL)有关,慢性化脓性中耳炎是发展中国家造成这种永久性听力损失的主要原因,在美国造成的损失高达 40 亿至 110 亿美元。然而,其潜在机制仍不为人知。在此,我们研究了巨噬细胞是如何驱动 CSOM 出现永久性听力损失的。我们首先证实了 CSOM 中的耳蜗巨噬细胞发生了 NLRP3 炎性体激活。然后,我们发现外耳道毛细胞(OHC)在CSOM中受到巨噬细胞消耗的保护,随后又证实了在NLRP3基因敲除条件下也受到了同样的保护。此外,我们还发现,治疗性抑制 NLRP3 炎性体活化和下游抑制 IL-1β 可保护 CSOM 中的外耳道细胞。总之,我们的数据表明,CSOM听力损失的主要驱动因素是耳蜗巨噬细胞中NLRP3炎性体的活化,而这是可治疗的靶点,这为开发干预措施以预防永久性听力损失的主要原因和发达国家的昂贵疾病开辟了道路。
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引用次数: 0
Permethrin exposure primes neuroinflammatory stress response to drive depression-like behavior through microglial activation in a mouse model of Gulf War Illness 在海湾战争病小鼠模型中,暴露于氯菊酯会激发神经炎症应激反应,通过激活小胶质细胞驱动类似抑郁症的行为
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-13 DOI: 10.1186/s12974-024-03215-3
Sean X. Naughton, Eun-Jeong Yang, Umar Iqbal, Kyle Trageser, Daniel Charytonowicz, Sibilla Masieri, Molly Estill, Henry Wu, Urdhva Raval, Weiting Lyu, Qing-li Wu, Li Shen, James Simon, Robert Sebra, Giulio Maria Pasinetti
Gulf War Illness (GWI) is a chronic multisymptom disorder that affects approximately 25–32% of Gulf War veterans and is characterized by a number of symptoms such as cognitive impairment, psychiatric disturbances, chronic fatigue and gastrointestinal distress, among others. While the exact etiology of GWI is unknown, it is believed to have been caused by toxic exposures encountered during deployment in combination with other factors such as stress. In the present study we sought to evaluate the hypothesis that exposure to the toxin permethrin could prime neuroinflammatory stress response and elicit psychiatric symptoms associated with GWI. Specifically, we developed a mouse model of GWI, to evaluate the effects of chronic permethrin exposure followed by unpredictable stress. We found that subjecting mice to 14 days of chronic permethrin exposure followed by 7 days of unpredictable stress resulted in the development of depression-like behavior. This behavioral change coincided with distinct alterations in the microglia phenotype, indicating microglial activation in the hippocampus. We revealed that blocking microglial activation through Gi inhibitory DREADD receptors in microglia effectively prevented the behavioral change associated with permethrin and stress exposure. To elucidate the transcriptional networks impacted within distinct microglia populations linked to depression-like behavior in mice exposed to both permethrin and stress, we conducted a single-cell RNA sequencing analysis using 21,566 single nuclei collected from the hippocampus of mice. For bioinformatics, UniCell Deconvolve was a pre-trained, interpretable, deep learning model used to deconvolve cell type fractions and predict cell identity across spatial datasets. Our bioinformatics analysis identified significant alterations in permethrin exposure followed by stress-associated microglia population, notably pathways related to neuronal development, neuronal communication, and neuronal morphogenesis, all of which are associated with neural synaptic plasticity. Additionally, we observed permethrin exposure followed by stress-mediated changes in signal transduction, including modulation of chemical synaptic transmission, regulation of neurotransmitter receptors, and regulation of postsynaptic neurotransmitter receptor activity, a known contributor to the pathophysiology of depression in a subset of the hippocampal pyramidal neurons in CA3 subregions. Our findings tentatively suggest that permethrin may prime microglia towards a state of inflammatory activation that can be triggered by psychological stressors, resulting in depression-like behavior and alterations of neural plasticity. These findings underscore the significance of synergistic interactions between multi-causal factors associated with GWI.
海湾战争疾病(GWI)是一种慢性多症状疾病,约有 25%-32% 的海湾战争退伍军人患有这种疾病,其特征是出现认知障碍、精神障碍、慢性疲劳和肠胃不适等一系列症状。虽然海湾战争综合症的确切病因尚不清楚,但人们认为它是由部署期间接触的有毒物质与压力等其他因素共同造成的。在本研究中,我们试图对以下假设进行评估:暴露于菊酯类毒素可能会引发神经炎症应激反应,并诱发与 GWI 相关的精神症状。具体来说,我们建立了一个 GWI 小鼠模型,以评估长期接触氯菊酯和不可预测的应激所产生的影响。我们发现,让小鼠长期接触氯菊酯 14 天,然后再接受 7 天不可预测的应激,会导致小鼠出现类似抑郁症的行为。这种行为变化与小胶质细胞表型的明显改变相吻合,表明海马中的小胶质细胞被激活。我们发现,通过小胶质细胞中的Gi抑制性DREADD受体阻断小胶质细胞的活化能有效地防止与氯菊酯和应激暴露相关的行为变化。为了阐明与暴露于氯菊酯和应激的小鼠抑郁样行为相关的不同小胶质细胞群内的转录网络,我们使用从小鼠海马中收集的 21,566 个单个细胞核进行了单细胞 RNA 测序分析。在生物信息学方面,UniCell Deconvolve 是一种预先训练好的、可解释的深度学习模型,用于解卷积细胞类型分数和预测跨空间数据集的细胞身份。我们的生物信息学分析发现,在暴露于菊酯后,应激相关的小胶质细胞群发生了显著变化,特别是与神经元发育、神经元通讯和神经元形态发生相关的通路,所有这些通路都与神经突触可塑性有关。此外,我们还观察到暴露于菊酯后应激介导的信号转导变化,包括化学突触传递的调节、神经递质受体的调节以及突触后神经递质受体活性的调节。我们的研究结果初步表明,菊酯可能会促使小胶质细胞进入炎症激活状态,而这种激活状态可由心理压力触发,从而导致类似抑郁症的行为和神经可塑性的改变。这些发现强调了与 GWI 相关的多因果因素之间协同作用的重要性。
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引用次数: 0
Preoperative gut microbiota of POCD patients induces pre- and postoperative cognitive impairment and systemic inflammation in rats POCD 患者术前肠道微生物群诱导大鼠术前和术后认知障碍和全身炎症
IF 9.3 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-09-12 DOI: 10.1186/s12974-024-03220-6
Xin Wei, Fei Xing, Yaowei Xu, Fan Zhang, Dan Cheng, Yinhui Zhou, Fei Zheng, Wei Zhang
Postoperative cognitive dysfunction (POCD) is common following surgery in elderly patients. The role of the preoperative gut microbiota in POCD has attracted increasing attention, but the potential underlying mechanisms remain unclear. This research aimed to investigate the impact of the preoperative gut microbiota on POCD. Herein, we analyzed the preoperative gut microbiota of POCD patients through a prospective specimen collection and retrospective blinded evaluation study. Then, we transferred the preoperative gut microbiota of POCD patients to antibiotic-treated rats and established POCD model by abdominal surgery to explore the impact of the preoperative gut microbiota on pre- and postoperative cognitive function and systemic inflammation. The gut microbiota was analyzed using 16S rRNA sequencing analysis. The Morris water maze test was performed to evaluate learning and memory abilities. The inflammatory cytokines TNF-α, IL-1β and IL-6 in the serum and hippocampus were measured by ELISA. Microglia were examined by immunofluorescence staining for Iba-1. Based on the decrease in the postoperative MMSE score, 24 patients were identified as having POCD and were matched with 24 control patients. Compared with control patients, POCD patients exhibited higher BMI and lower preoperative MMSE score. The preoperative gut microbiota of POCD patients had lower bacterial richness but a larger distribution, decreased abundance of Firmicutes and increased abundance of Proteobacteria than did that of control patients. Compared with rats that received preoperative fecal samples of control patients, rats that received preoperative fecal samples of POCD patients presented an increased abundance of Desulfobacterota, decreased cognitive function, increased levels of TNF-α and IL-1β in the serum, increased levels of TNF-α and greater microglial activation in the hippocampus. Additionally, correlation analysis revealed a positive association between the abundance of Desulfobacterota and the level of serum TNF-α in rats. Then, we performed abdominal surgery to investigate the impact of the preoperative gut microbiota on postoperative conditions, and the surgery did indeed cause POCD and inflammatory response. Notably, compared with rats that received preoperative fecal samples of control patients, rats that received preoperative fecal samples of POCD patients displayed exacerbated cognitive impairment; increased levels of TNF-α, IL-1β and IL-6 in the serum and hippocampus; and increased activation of microglia in the hippocampus. Our findings suggest that the preoperative gut microbiota of POCD patients can induce preoperative and aggravate postoperative cognitive impairment and systemic inflammation in rats. Modulating inflammation by targeting the gut microbiota might be a promising approach for preventing POCD.
术后认知功能障碍(POCD)是老年患者手术后的常见症状。术前肠道微生物群在 POCD 中的作用已引起越来越多的关注,但其潜在的内在机制仍不清楚。本研究旨在探讨术前肠道微生物群对 POCD 的影响。在此,我们通过前瞻性标本采集和回顾性盲法评估研究分析了 POCD 患者术前的肠道微生物群。然后,我们将 POCD 患者术前的肠道微生物群转入抗生素治疗的大鼠体内,通过腹部手术建立 POCD 模型,探讨术前肠道微生物群对术前、术后认知功能和全身炎症的影响。采用 16S rRNA 测序分析法对肠道微生物群进行分析。进行莫里斯水迷宫测试以评估学习和记忆能力。用酶联免疫吸附法测定了血清和海马中的炎症细胞因子 TNF-α、IL-1β 和 IL-6。用免疫荧光染色法检测小胶质细胞的 Iba-1。根据术后 MMSE 评分的下降情况,24 名患者被确定为 POCD 患者,并与 24 名对照组患者进行配对。与对照组患者相比,POCD 患者的体重指数(BMI)较高,术前 MMSE 评分较低。与对照组患者相比,POCD 患者术前肠道微生物群的细菌丰富度较低,但分布范围更大,固醇菌的丰富度降低,变形菌的丰富度升高。与接受了对照组患者术前粪便样本的大鼠相比,接受了 POCD 患者术前粪便样本的大鼠体内脱硫杆菌丰度增加,认知功能下降,血清中 TNF-α 和 IL-1β 水平升高,TNF-α 水平升高,海马中的小胶质细胞活化程度升高。此外,相关分析表明,大鼠脱硫杆菌群的丰度与血清中 TNF-α 的水平呈正相关。随后,我们进行了腹部手术,以研究术前肠道微生物群对术后情况的影响。值得注意的是,与接受对照组患者术前粪便样本的大鼠相比,接受 POCD 患者术前粪便样本的大鼠表现出认知障碍加重;血清和海马中 TNF-α、IL-1β 和 IL-6 水平升高;海马中小胶质细胞活化增加。我们的研究结果表明,POCD 患者术前的肠道微生物群可诱导大鼠术前认知功能障碍和全身炎症,并加重术后认知功能障碍和全身炎症。通过靶向肠道微生物群来调节炎症可能是一种很有前景的预防 POCD 的方法。
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引用次数: 0
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Journal of Neuroinflammation
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