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Navigating the mutation maze: An oncogenic driver’s guide to macrophage reprogramming 穿越突变迷宫:巨噬细胞重编程的致癌驱动指南
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-11-12 DOI: 10.1016/j.immuni.2024.10.007
Ziyi Li, Ankur Sharma
The mechanisms by which oncogenic mutations and anatomical locations work together to influence the immune environment within tumors are not well understood. In this issue of Immunity, Ross et al. show that H3.3K27M diffuse midline gliomas (DMGs) are enriched with disease-associated myeloid cells (DAMs). Myeloid-targeted strategies reprogram DAMs to a homeostatic state, reduce myeloid infiltration into tumors, and prolong survival.
致癌突变和解剖位置共同影响肿瘤内免疫环境的机制尚不十分清楚。在本期《免疫》杂志上,Ross等人的研究表明,H3.3K27M弥漫中线胶质瘤(DMGs)富含疾病相关髓系细胞(DAMs)。以髓系细胞为靶点的策略能将DAMs重新编程为一种平衡状态,减少髓系细胞对肿瘤的浸润,并延长生存期。
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引用次数: 0
Maintenance and functional regulation of immune memory to COVID-19 vaccines in tissues 组织中 COVID-19 疫苗免疫记忆的维持和功能调节
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-11-06 DOI: 10.1016/j.immuni.2024.10.003
Julia Davis-Porada, Alex B. George, Nora Lam, Daniel P. Caron, Joshua I. Gray, Jenny Huang, Jennifer Hwu, Steven B. Wells, Rei Matsumoto, Masaru Kubota, YoonSeung Lee, Rory Morrison-Colvin, Isaac J. Jensen, Basak B. Ural, Namir Shaabani, Daniela Weiskopf, Alba Grifoni, Alessandro Sette, Peter A. Szabo, John R. Teijaro, Donna L. Farber
Memory T and B cells in tissues are essential for protective immunity. Here, we performed a comprehensive analysis of the tissue distribution, phenotype, durability, and transcriptional profile of COVID-19 mRNA vaccine-induced immune memory across blood, lymphoid organs, and lungs obtained from 63 vaccinated organ donors aged 23–86, some of whom experienced SARS-CoV-2 infection. Spike (S)-reactive memory T cells were detected in lymphoid organs and lungs and variably expressed tissue-resident markers based on infection history, and S-reactive B cells comprised class-switched memory cells resident in lymphoid organs. Compared with blood, S-reactive tissue memory T cells persisted for longer times post-vaccination and were more prevalent with age. S-reactive T cells displayed site-specific subset compositions and functions: regulatory cell profiles were enriched in tissues, while effector and cytolytic profiles were more abundant in circulation. Our findings reveal functional compartmentalization of vaccine-induced T cell memory where surveilling effectors and in situ regulatory responses confer protection with minimal tissue damage.
组织中的记忆性 T 细胞和 B 细胞对保护性免疫至关重要。在这里,我们对 COVID-19 mRNA 疫苗诱导的免疫记忆在血液、淋巴器官和肺部的组织分布、表型、持久性和转录谱进行了全面分析,研究对象是 63 名年龄在 23-86 岁之间的器官捐献者,其中一些人曾感染过 SARS-CoV-2。在淋巴器官和肺部检测到尖峰(S)反应记忆T细胞,并根据感染史不同表达不同的组织驻留标记,S反应B细胞包括驻留在淋巴器官的类调换记忆细胞。与血液相比,S反应性组织记忆T细胞在接种疫苗后持续存在的时间更长,而且随着年龄的增长更为普遍。S 反应性 T 细胞显示出特定部位的亚群组成和功能:调节细胞特征在组织中更为丰富,而效应细胞和细胞溶解特征在循环中更为丰富。我们的研究结果揭示了疫苗诱导的 T 细胞记忆的功能分区,在这些分区中,监测效应细胞和原位调节反应可提供保护,同时将组织损伤降到最低。
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引用次数: 0
Isolation and escape mapping of broadly neutralizing antibodies against emerging delta-coronaviruses 针对新出现的δ-冠状病毒的广谱中和抗体的分离和逃逸图谱绘制
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-11-01 DOI: 10.1016/j.immuni.2024.10.001
Megi Rexhepaj, Daniel Asarnow, Lisa Perruzza, Young-Jun Park, Barbara Guarino, Mathew Mccallum, Katja Culap, Christian Saliba, Giada Leoni, Alessio Balmelli, Courtney N. Yoshiyama, Miles S. Dickinson, Joel Quispe, Jack T. Brown, M. Alejandra Tortorici, Kaitlin R. Sprouse, Ashley L. Taylor, Davide Corti, Tyler N. Starr, Fabio Benigni, David Veesler
Porcine delta-coronavirus (PDCoV) spillovers were recently detected in febrile children, underscoring the recurrent zoonoses of divergent CoVs. To date, no vaccines or specific therapeutics are approved for use in humans against PDCoV. To prepare for possible future PDCoV epidemics, we isolated PDCoV spike (S)-directed monoclonal antibodies (mAbs) from humanized mice and found that two, designated PD33 and PD41, broadly neutralized a panel of PDCoV variants. Cryoelectron microscopy (cryo-EM) structures of PD33 and PD41 in complex with the S receptor-binding domain (RBD) and ectodomain trimer revealed the epitopes recognized by these mAbs, rationalizing their broad inhibitory activity. We show that both mAbs competitively interfere with host aminopeptidase N binding to neutralize PDCoV and used deep-mutational scanning epitope mapping to associate RBD antigenic sites with mAb-mediated neutralization potency. Our results indicate a PD33-PD41 mAb cocktail may heighten the barrier to escape. PD33 and PD41 are candidates for clinical advancement against future PDCoV outbreaks.
最近在发热儿童中发现了猪三角冠状病毒(PDCoV)的外溢,这突显了不同的 CoVs 在人畜间的反复传播。迄今为止,还没有针对 PDCoV 的疫苗或特定疗法获准用于人类。为了应对未来可能出现的 PDCoV 流行病,我们从人源化小鼠体内分离出了 PDCoV 穗状病毒(S)定向单克隆抗体 (mAbs),并发现 PD33 和 PD41 这两种单克隆抗体能广泛中和一系列 PDCoV 变种。PD33 和 PD41 与 S 受体结合域(RBD)和外显子三聚体的冷冻电子显微镜(cryo-EM)结构揭示了这些 mAbs 识别的表位,从而使其广泛的抑制活性更加合理。我们发现这两种 mAb 都能竞争性地干扰宿主氨肽酶 N 的结合,从而中和 PDCoV,并利用深度突变扫描表位图谱将 RBD 抗原位点与 mAb 介导的中和效力联系起来。我们的研究结果表明,PD33-PD41 mAb 鸡尾酒可增强逃逸障碍。PD33 和 PD41 是应对未来 PDCoV 爆发的候选临床药物。
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引用次数: 0
Progressive polyadenylation and m6A modification of Ighg1 mRNA maintain IgG1 antibody homeostasis in antibody-secreting cells Ighg1 mRNA 的渐进多腺苷酸化和 m6A 修饰维持抗体分泌细胞中 IgG1 抗体的稳态
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-29 DOI: 10.1016/j.immuni.2024.10.004
Yu Wang, Shaocun Zhang, Na Kang, Lihui Dong, Haochen Ni, Sichen Liu, Siankang Chong, Zhenglin Ji, Zhengpeng Wan, Xiangjun Chen, Fei Wang, Yun Lu, Baidong Hou, Pei Tong, Hai Qi, Meng Michelle Xu, Wanli Liu
Antigen-specific antibodies are generated by antibody-secreting cells (ASCs). How RNA post-transcriptional modification affects antibody homeostasis remains unclear. Here, we found that mRNA polyadenylations and N6-methyladenosine (m6A) modifications maintain IgG1 antibody production in ASCs. IgG heavy-chain transcripts (Ighg) possessed a long 3′ UTR with m6A sites, targeted by the m6A reader YTHDF1. B cell-specific deficiency of YTHDF1 impaired IgG production upon antigen immunization through reducing Ighg1 mRNA abundance in IgG1+ ASCs. Disrupting either the m6A modification of a nuclear-localized splicing intermediate Ighg1 or the nuclear localization of YTHDF1 reduced Ighg1 transcript stability. Single-cell RNA sequencing identified an ASC subset with excessive YTHDF1 expression in systemic lupus erythematosus patients, which was decreased upon therapy with immunosuppressive drugs. In a lupus mouse model, inhibiting YTHDF1-m6A interactions alleviated symptoms. Thus, we highlight a mechanism in ASCs to sustain the homeostasis of IgG antibody transcripts by integrating Ighg1 mRNA polyadenylation and m6A modification.
抗原特异性抗体由抗体分泌细胞(ASCs)产生。RNA转录后修饰如何影响抗体稳态仍不清楚。在这里,我们发现mRNA多腺苷酸化和N6-甲基腺苷(m6A)修饰能维持ASCs中IgG1抗体的产生。IgG 重链转录本(Ighg)具有长的 3′ UTR,带有 m6A 位点,是 m6A 阅读器 YTHDF1 的靶标。B 细胞特异性缺乏 YTHDF1 会降低 IgG1+ ASCs 中 Ighg1 mRNA 的丰度,从而影响抗原免疫后 IgG 的产生。破坏核定位剪接中间体Ighg1的m6A修饰或YTHDF1的核定位都会降低Ighg1转录本的稳定性。单细胞 RNA 测序确定了系统性红斑狼疮患者中 YTHDF1 过度表达的 ASC 亚群,该亚群在接受免疫抑制剂治疗后表达减少。在狼疮小鼠模型中,抑制 YTHDF1-m6A 的相互作用可减轻症状。因此,我们强调了ASCs中通过整合Ighg1 mRNA多腺苷酸化和m6A修饰来维持IgG抗体转录本平衡的机制。
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引用次数: 0
Transcription factor TCF1 binds to RORγt and orchestrates a regulatory network that determines homeostatic Th17 cell state 转录因子 TCF1 与 RORγt 结合,协调决定 Th17 细胞平衡状态的调控网络
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-23 DOI: 10.1016/j.immuni.2024.09.017
Davide Mangani, Ayshwarya Subramanian, Linglin Huang, Hanning Cheng, S. Harsha Krovi, Yufan Wu, Dandan Yang, Thais G. Moreira, Giulia Escobar, Alexandra Schnell, Karen O. Dixon, Rajesh K. Krishnan, Vasundhara Singh, Raymond A. Sobel, Howard L. Weiner, Vijay K. Kuchroo, Ana C. Anderson
T helper (Th) 17 cells encompass a spectrum of cell states, including cells that maintain homeostatic tissue functions and pro-inflammatory cells that can drive autoimmune tissue damage. Identifying regulators that determine Th17 cell states can identify ways to control tissue inflammation and restore homeostasis. Here, we found that interleukin (IL)-23, a cytokine critical for inducing pro-inflammatory Th17 cells, decreased transcription factor T cell factor 1 (TCF1) expression. Conditional deletion of TCF1 in mature T cells increased the pro-inflammatory potential of Th17 cells, even in the absence of IL-23 receptor signaling, and conferred pro-inflammatory potential to homeostatic Th17 cells. Conversely, sustained TCF1 expression decreased pro-inflammatory Th17 potential. Mechanistically, TCF1 bound to RORγt, thereby interfering with its pro-inflammatory functions, and orchestrated a regulatory network that determined Th17 cell state. Our findings identify TCF1 as a major determinant of Th17 cell state and provide important insight for the development of therapies for Th17-driven inflammatory diseases.
T辅助(Th)17细胞包含一系列细胞状态,包括维持组织稳态功能的细胞和可导致自身免疫组织损伤的促炎症细胞。确定决定 Th17 细胞状态的调节因子可以找出控制组织炎症和恢复平衡的方法。在这里,我们发现白细胞介素(IL)-23(一种对诱导促炎Th17细胞至关重要的细胞因子)会降低转录因子T细胞因子1(TCF1)的表达。即使在没有IL-23受体信号传导的情况下,成熟T细胞中TCF1的条件性缺失也会增加Th17细胞的促炎潜能,并使处于平衡状态的Th17细胞具有促炎潜能。相反,TCF1的持续表达会降低Th17细胞的促炎潜能。从机理上讲,TCF1与RORγt结合,从而干扰了其促炎功能,并协调了一个决定Th17细胞状态的调控网络。我们的研究结果确定了TCF1是Th17细胞状态的主要决定因素,并为开发治疗Th17驱动的炎症性疾病的疗法提供了重要启示。
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引用次数: 0
Apolipoprotein E aggregation in microglia initiates Alzheimer’s disease pathology by seeding β-amyloidosis 小胶质细胞中载脂蛋白 E 的聚集通过播散 β 淀粉样蛋白沉积引发阿尔茨海默病的病理变化
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-16 DOI: 10.1016/j.immuni.2024.09.014
Seiji Kaji, Stefan A. Berghoff, Lena Spieth, Lennart Schlaphoff, Andrew O. Sasmita, Simona Vitale, Luca Büschgens, Shreeya Kedia, Martin Zirngibl, Taisiia Nazarenko, Alkmini Damkou, Leon Hosang, Constanze Depp, Frits Kamp, Patricia Scholz, David Ewers, Martin Giera, Till Ischebeck, Wolfgang Wurst, Benedikt Wefers, Mikael Simons
The seeded growth of pathogenic protein aggregates underlies the pathogenesis of Alzheimer’s disease (AD), but how this pathological cascade is initiated is not fully understood. Sporadic AD is linked genetically to apolipoprotein E (APOE) and other genes expressed in microglia related to immune, lipid, and endocytic functions. We generated a transgenic knockin mouse expressing HaloTag-tagged APOE and optimized experimental protocols for the biochemical purification of APOE, which enabled us to identify fibrillary aggregates of APOE in mice with amyloid-β (Aβ) amyloidosis and in human AD brain autopsies. These APOE aggregates that stained positive for β sheet-binding dyes triggered Aβ amyloidosis within the endo-lysosomal system of microglia, in a process influenced by microglial lipid metabolism and the JAK/STAT signaling pathway. Taking these observations together, we propose a model for the onset of Aβ amyloidosis in AD, suggesting that the endocytic uptake and aggregation of APOE by microglia can initiate Aβ plaque formation.
致病蛋白聚集体的种子生长是阿尔茨海默病(AD)发病机制的基础,但这一病理级联是如何启动的还不完全清楚。散发性阿兹海默病在遗传学上与载脂蛋白 E(APOE)和其他在小胶质细胞中表达的与免疫、脂质和内细胞功能相关的基因有关。我们生成了表达 HaloTag 标记 APOE 的转基因基因敲除小鼠,并优化了生化纯化 APOE 的实验方案,这使我们能够在淀粉样蛋白-β(Aβ)淀粉样变性小鼠和人类 AD 脑尸检中鉴定出 APOE 的纤维状聚集体。这些对β片状结合染料染色呈阳性的APOE聚集体引发了小胶质细胞内溶酶体系统中的β淀粉样变性,这一过程受到小胶质细胞脂质代谢和JAK/STAT信号通路的影响。综合这些观察结果,我们提出了AD中Aβ淀粉样变性的发病模型,认为小胶质细胞对APOE的内摄和聚集可启动Aβ斑块的形成。
{"title":"Apolipoprotein E aggregation in microglia initiates Alzheimer’s disease pathology by seeding β-amyloidosis","authors":"Seiji Kaji, Stefan A. Berghoff, Lena Spieth, Lennart Schlaphoff, Andrew O. Sasmita, Simona Vitale, Luca Büschgens, Shreeya Kedia, Martin Zirngibl, Taisiia Nazarenko, Alkmini Damkou, Leon Hosang, Constanze Depp, Frits Kamp, Patricia Scholz, David Ewers, Martin Giera, Till Ischebeck, Wolfgang Wurst, Benedikt Wefers, Mikael Simons","doi":"10.1016/j.immuni.2024.09.014","DOIUrl":"https://doi.org/10.1016/j.immuni.2024.09.014","url":null,"abstract":"The seeded growth of pathogenic protein aggregates underlies the pathogenesis of Alzheimer’s disease (AD), but how this pathological cascade is initiated is not fully understood. Sporadic AD is linked genetically to apolipoprotein E (<em>APOE</em>) and other genes expressed in microglia related to immune, lipid, and endocytic functions. We generated a transgenic knockin mouse expressing HaloTag-tagged APOE and optimized experimental protocols for the biochemical purification of APOE, which enabled us to identify fibrillary aggregates of APOE in mice with amyloid-β (Aβ) amyloidosis and in human AD brain autopsies. These APOE aggregates that stained positive for β sheet-binding dyes triggered Aβ amyloidosis within the endo-lysosomal system of microglia, in a process influenced by microglial lipid metabolism and the JAK/STAT signaling pathway. Taking these observations together, we propose a model for the onset of Aβ amyloidosis in AD, suggesting that the endocytic uptake and aggregation of APOE by microglia can initiate Aβ plaque formation.","PeriodicalId":13269,"journal":{"name":"Immunity","volume":"92 1","pages":""},"PeriodicalIF":32.4,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142439689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Retinoic acid and TGF-β orchestrate organ-specific programs of tissue residency 维甲酸和 TGF-β 协调器官特异性组织驻留程序
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-14 DOI: 10.1016/j.immuni.2024.09.015
Andreas Obers, Tobias Poch, Grace Rodrigues, Susan N. Christo, Luke C. Gandolfo, Raissa Fonseca, Ali Zaid, Joey En Yu Kuai, Hongjin Lai, Pirooz Zareie, Marina H. Yakou, Lachlan Dryburgh, Thomas N. Burn, James Dosser, Frank A. Buquicchio, Caleb A. Lareau, Calum Walsh, Louise Judd, Maria Rafailia Theodorou, Katharina Gutbrod, Laura K. Mackay
Tissue-resident memory T (TRM) cells are integral to tissue immunity, persisting in diverse anatomical sites where they adhere to a common transcriptional framework. How these cells integrate distinct local cues to adopt the common TRM cell fate remains poorly understood. Here, we show that whereas skin TRM cells strictly require transforming growth factor β (TGF-β) for tissue residency, those in other locations utilize the metabolite retinoic acid (RA) to drive an alternative differentiation pathway, directing a TGF-β-independent tissue residency program in the liver and synergizing with TGF-β to drive TRM cells in the small intestine. We found that RA was required for the long-term maintenance of intestinal TRM populations, in part by impeding their retrograde migration. Moreover, enhanced RA signaling modulated TRM cell phenotype and function, a phenomenon mirrored in mice with increased microbial diversity. Together, our findings reveal RA as a fundamental component of the host-environment interaction that directs immunosurveillance in tissues.
组织驻留记忆 T(TRM)细胞是组织免疫不可或缺的一部分,它们持续存在于不同的解剖部位,在那里它们遵循共同的转录框架。人们对这些细胞如何整合不同的局部线索以采用共同的TRM细胞命运仍然知之甚少。在这里,我们发现皮肤TRM细胞严格需要转化生长因子β(TGF-β)才能在组织中驻留,而其他部位的TRM细胞则利用代谢产物视黄酸(RA)来驱动另一种分化途径,在肝脏中引导不依赖于TGF-β的组织驻留程序,并与TGF-β协同驱动小肠中的TRM细胞。我们发现,肠道 TRM 群体的长期维持需要 RA,部分原因是 RA 阻碍了它们的逆向迁移。此外,增强的 RA 信号调节了 TRM 细胞的表型和功能,这一现象反映在微生物多样性增加的小鼠身上。总之,我们的研究结果揭示了 RA 是宿主与环境相互作用的基本组成部分,它引导着组织中的免疫监视。
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引用次数: 0
CRISPR screens unveil nutrient-dependent lysosomal and mitochondrial nodes impacting intestinal tissue-resident memory CD8+ T cell formation CRISPR 筛选揭示了影响肠组织驻留记忆 CD8+ T 细胞形成的营养依赖性溶酶体和线粒体节点
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-14 DOI: 10.1016/j.immuni.2024.09.013
Jana L. Raynor, Nicholas Collins, Hao Shi, Cliff Guy, Jordy Saravia, Seon Ah Lim, Nicole M. Chapman, Peipei Zhou, Yan Wang, Yu Sun, Isabel Risch, Haoran Hu, Anil KC, Renqiang Sun, Sharad Shrestha, Hongling Huang, Jon P. Connelly, Shondra M. Pruett-Miller, Miguel Reina-Campos, Ananda W. Goldrath, Hongbo Chi
Nutrient availability and organelle biology direct tissue homeostasis and cell fate, but how these processes orchestrate tissue immunity remains poorly defined. Here, using in vivo CRISPR-Cas9 screens, we uncovered organelle signaling and metabolic processes shaping CD8+ tissue-resident memory T (TRM) cell development. TRM cells depended on mitochondrial translation and respiration. Conversely, three nutrient-dependent lysosomal signaling nodes—Flcn, Ragulator, and Rag GTPases—inhibited intestinal TRM cell formation. Depleting these molecules or amino acids activated the transcription factor Tfeb, thereby linking nutrient stress to TRM programming. Further, Flcn deficiency promoted protective TRM cell responses in the small intestine. Mechanistically, the Flcn-Tfeb axis restrained retinoic acid-induced CCR9 expression for migration and transforming growth factor β (TGF-β)-mediated programming for lineage differentiation. Genetic interaction screening revealed that the mitochondrial protein Mrpl52 enabled early TRM cell formation, while Acss1 controlled TRM cell development under Flcn deficiency-associated lysosomal dysregulation. Thus, the interplay between nutrients, organelle signaling, and metabolic adaptation dictates tissue immunity.
营养供应和细胞器生物学指导着组织的稳态和细胞的命运,但这些过程如何协调组织免疫仍未明确。在这里,我们利用体内 CRISPR-Cas9 筛选,发现了影响 CD8+ 组织驻留记忆 T(TRM)细胞发育的细胞器信号传导和代谢过程。TRM细胞依赖线粒体翻译和呼吸。相反,三个营养依赖性溶酶体信号节点--Flcn、Ragulator 和 Rag GTPases抑制了肠道 TRM 细胞的形成。缺乏这些分子或氨基酸会激活转录因子 Tfeb,从而将营养压力与 TRM 的形成联系起来。此外,Flcn的缺乏促进了小肠中TRM细胞的保护性反应。从机理上讲,Flcn-Tfeb轴抑制了维甲酸诱导的CCR9表达以促进迁移和转化生长因子β(TGF-β)介导的细胞系分化程序。基因相互作用筛选显示,线粒体蛋白Mrpl52能促进TRM细胞的早期形成,而Acss1则能在Flcn缺乏相关溶酶体失调的情况下控制TRM细胞的发育。因此,营养物质、细胞器信号传导和代谢适应之间的相互作用决定了组织免疫力。
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引用次数: 0
Autoimmune CD4+ T cells fine-tune TCF1 expression to maintain function and survive persistent antigen exposure during diabetes 自身免疫性 CD4+ T 细胞对 TCF1 的表达进行微调,以维持功能并在糖尿病期间持续接触抗原后存活下来
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-12 DOI: 10.1016/j.immuni.2024.09.016
Nouf Aljobaily, Denise Allard, Bryant Perkins, Arielle Raugh, Tessa Galland, Yi Jing, W. Zac Stephens, Matthew L. Bettini, J. Scott Hale, Maria Bettini
Self-reactive T cells experience chronic antigen exposure but do not exhibit signs of exhaustion. Here, we investigated the mechanisms for sustained, functioning autoimmune CD4+ T cells despite chronic stimulation. Examination of T cell priming showed that CD4+ T cells activated in the absence of infectious signals retained TCF1 expression. At later time points and during blockade of new T cell recruitment, most islet-infiltrating autoimmune CD4+ T cells were TCF1+, although expression was reduced on a per T cell basis. The Tcf7 locus was epigenetically modified in circulating autoimmune CD4+ T cells, suggesting a pre-programmed de novo methylation of the locus in early stages of autoimmune CD4+ T cell differentiation. This mirrored the epigenetic profile of recently recruited CD4+CD62L+ T cells in the pancreas. Collectively, these data reveal a unique environment during autoimmune CD4+ T cell priming that allows T cells to fine-tune TCF1 expression and maintain long-term survival and function.
自我反应 T 细胞会长期暴露于抗原,但不会表现出衰竭的迹象。在这里,我们研究了自身免疫 CD4+ T 细胞在长期刺激下仍能持续发挥作用的机制。对 T 细胞引物的研究表明,在没有感染信号的情况下激活的 CD4+ T 细胞保留了 TCF1 的表达。在较晚的时间点和阻断新T细胞招募期间,大多数小岛浸润的自身免疫CD4+ T细胞都是TCF1+,尽管每个T细胞的表达量减少了。在循环的自身免疫 CD4+ T 细胞中,Tcf7 基因座发生了表观遗传学改变,这表明在自身免疫 CD4+ T 细胞分化的早期阶段,该基因座发生了预编程的从头甲基化。这反映了胰腺中最近招募的 CD4+CD62L+ T 细胞的表观遗传学特征。总之,这些数据揭示了自身免疫 CD4+ T 细胞初始化过程中的独特环境,它允许 T 细胞微调 TCF1 的表达并维持长期存活和功能。
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引用次数: 0
Microglia and monocyte-derived macrophages drive progression of pediatric high-grade gliomas and are transcriptionally shaped by histone mutations 小胶质细胞和单核细胞衍生巨噬细胞推动小儿高级别胶质瘤的发展,并通过组蛋白突变形成转录
IF 32.4 1区 医学 Q1 IMMUNOLOGY Pub Date : 2024-10-11 DOI: 10.1016/j.immuni.2024.09.007
James L. Ross, Montserrat Puigdelloses-Vallcorba, Gonzalo Piñero, Nishant Soni, Wes Thomason, John DeSisto, Angelo Angione, Nadejda M. Tsankova, Maria G. Castro, Matthew Schniederjan, Nitin R. Wadhwani, G. Praveen Raju, Peter Morgenstern, Oren J. Becher, Adam L. Green, Alexander M. Tsankov, Dolores Hambardzumyan
Pediatric high-grade gliomas (pHGGs), including hemispheric pHGGs and diffuse midline gliomas (DMGs), harbor mutually exclusive tumor location-specific histone mutations. Using immunocompetent de novo mouse models of pHGGs, we demonstrated that myeloid cells were the predominant infiltrating non-neoplastic cell population. Single-cell RNA sequencing (scRNA-seq), flow cytometry, and immunohistochemistry illustrated the presence of heterogeneous myeloid cell populations shaped by histone mutations and tumor location. Disease-associated myeloid (DAM) cell phenotypes demonstrating immune permissive characteristics were identified in murine and human pHGG samples. H3.3K27M DMGs, the most aggressive DMG, demonstrated enrichment of DAMs. Genetic ablation of chemokines Ccl8 and Ccl12 resulted in a reduction of DAMs and an increase in lymphocyte infiltration, leading to increased survival of tumor-bearing mice. Pharmacologic inhibition of chemokine receptors CCR1 and CCR5 resulted in extended survival and decreased myeloid cell infiltration. This work establishes the tumor-promoting role of myeloid cells in DMG and the potential therapeutic opportunities for targeting them.
小儿高级别胶质瘤(pHGGs),包括半球pHGGs和弥漫中线胶质瘤(DMGs),都存在相互排斥的肿瘤位置特异性组蛋白突变。我们利用免疫功能正常的 pHGGs 新生小鼠模型证明,髓系细胞是主要的浸润性非肿瘤细胞群。单细胞 RNA 测序(scRNA-seq)、流式细胞术和免疫组织化学表明,组蛋白突变和肿瘤位置决定了异质性髓系细胞群的存在。在小鼠和人类pHGG样本中发现了疾病相关髓系(DAM)细胞表型,这些细胞表现出免疫许可特性。H3.3K27M DMG是最具侵袭性的DMG,显示出DAMs的富集。趋化因子 Ccl8 和 Ccl12 的基因消减导致 DAMs 减少,淋巴细胞浸润增加,从而提高了肿瘤小鼠的存活率。药物抑制趋化因子受体 CCR1 和 CCR5 可延长生存期并减少髓系细胞浸润。这项研究确定了髓系细胞在 DMG 中的肿瘤促进作用,以及针对髓系细胞的潜在治疗机会。
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引用次数: 0
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Immunity
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