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Molecular characterization of endosomal self RNA Rmrp-engaged TLR3 dimerization to prime innate activation 内体自身RNA rmrp参与TLR3二聚化以启动先天激活的分子特征。
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-09-08 DOI: 10.1038/s41422-025-01178-5
Shikun Zhang, Bo Li, Lun Liu, Dongsheng Gong, Deyu Zhang, Fengjiang Liu, Xiuna Yang, Hua Qin, Deling Kong, Shuyang Zhang, Zihe Rao, Xuetao Cao
The pre-dimerization of endosome-localized RNA sensor Toll-like receptor 3 (TLR3) is required for its innate recognition, yet how TLR3 pre-dimers are formed and precisely primed for innate activation remains unclear. Here, we demonstrate that endosome-localized self RNA Rmrp directly binds to TLR3 and induces TLR3 dimerization in the early endosome but does not interact with endosome-localized TLR7, TLR8, TLR9 or cytoplasmic RNA sensor RIG-I under homeostatic conditions. Cryo-EM structure of Rmrp–TLR3 complex reveals a novel lapped conformation of TLR3 dimer engaged by Rmrp, which is distinct from the activation mechanism by dsRNA and the specific structural feature at the 3’-end of Rmrp is critical for its functional interaction with TLR3. Furthermore, K42 residue of TLR3 is essential for binding to Rmrp and subsequent dimerization. Rmrp dissociates from TLR3 following endosomal acidification, generating a matured TLR3 dimer which is primed for innate recognition and activation. Myeloid-cell deficiency of Rmrp reduces TLR3 dimerization and attenuates TLR3-mediated antiviral responses against influenza A both in vitro and in vivo. These findings elucidate the structural mode of self RNA Rmrp-primed TLR3 dimerization and ready for efficient innate recognition on endosomal membrane, extending our knowledge of how membrane-associated TLRs pre-dimerize and suggesting a new function of subcellular localized self RNAs in empowering innate activation.
内核体定位RNA传感器toll样受体3 (TLR3)的预二聚体是其先天识别所必需的,但TLR3的预二聚体是如何形成的,以及如何精确地为先天激活启动尚不清楚。在此,我们证明了内核体定位的自身RNA Rmrp直接与TLR3结合并在早期内核体中诱导TLR3二聚化,但在稳态条件下不与内核体定位的TLR7、TLR8、TLR9或细胞质RNA传感器rig - 1相互作用。Rmrp-TLR3复合物的cro - em结构揭示了Rmrp参与的TLR3二聚体的一种新的重叠构象,这与dsRNA的激活机制不同,Rmrp 3'端的特定结构特征对于其与TLR3的功能相互作用至关重要。此外,TLR3的K42残基对于Rmrp的结合和随后的二聚化是必不可少的。Rmrp在内体酸化后与TLR3分离,产生成熟的TLR3二聚体,为先天识别和激活做好准备。在体外和体内研究中,髓细胞Rmrp缺失可降低TLR3二聚体并减弱TLR3介导的抗甲型流感抗病毒反应。这些发现阐明了自身RNA rmrp引发的TLR3二聚化的结构模式,并准备好在内体膜上进行有效的先天识别,扩展了我们对膜相关TLRs如何预二聚化的认识,并提示亚细胞定位的自身RNA在增强先天激活方面的新功能。
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引用次数: 0
Osteocalcin has many tricks to get γ-carboxylated 骨钙素有很多方法来使γ-羧化
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-09-05 DOI: 10.1038/s41422-025-01177-6
Mathieu Ferron
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引用次数: 0
Targeting necrotic lipid release in tumors enhances immunosurveillance and cancer immunotherapy of glioblastoma 靶向肿瘤坏死脂质释放增强胶质母细胞瘤的免疫监测和肿瘤免疫治疗
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-09-03 DOI: 10.1038/s41422-025-01155-y
Yapeng Ji, Junyao Jiang, Lei Hu, Peng Lin, Mingshan Zhou, Song Hu, Minkai Wang, Yuchen Ji, Xianzhi Liu, Dongming Yan, Yang Guo, Adwait Amod Sathe, Bret M. Evers, Chao Xing, Xuelian Luo, Qi Xie, Weike Pei, Zhenyu Zhang, Hongtao Yu
Tumors evolve to avoid immune destruction and establish an immunosuppressive microenvironment. Syngeneic mouse tumor models are critical for understanding tumor immune evasion and testing cancer immunotherapy. Derived from established mouse tumor cell lines that can already evade the immune system, these models cannot simulate early phases of immunoediting during initial tumorigenesis. We developed a syngeneic mouse teratoma model derived from noncancerous mouse embryonic stem cells and conducted a genome-wide CRISPR screen to identify genes that impact early phases of cancer immunoediting. We found that loss of pro-apoptotic tumor suppressor genes, including Trp53, increased necrosis in teratomas, releasing APOE lipid particles into the extracellular milieu. Infiltrating T cells drawn to tumor necrotic regions accumulated lipids and became dysfunctional. Blocking lipid uptake in T cells or reducing necrosis in teratomas by inactivating the mitochondrial permeability transition pore (mPTP) restored immunosurveillance. Because mouse teratomas were highly enriched for brain tissues, we next examined the tumor-immune interaction in human glioblastoma (GBM). Indeed, infiltrating T cells in TP53-mutated human GBM accumulated APOE and were dysfunctional. Anti-APOE and anti-PDCD1 antibodies synergistically boosted anti-GBM immunity and prolonged survival in mice. Our results link mPTP-mediated tumor necrosis to immune evasion and suggest that targeting the uptake of lipids released by necrotic tumor cells by infiltrating immune cells can enhance cancer immunotherapy.
肿瘤进化以避免免疫破坏并建立免疫抑制微环境。同基因小鼠肿瘤模型是了解肿瘤免疫逃避和测试癌症免疫治疗的关键。这些模型来源于已经建立的小鼠肿瘤细胞系,这些细胞系已经可以逃避免疫系统,因此不能模拟初始肿瘤发生过程中免疫编辑的早期阶段。我们开发了一种来自非癌小鼠胚胎干细胞的同基因小鼠畸胎瘤模型,并进行了全基因组CRISPR筛选,以确定影响癌症免疫编辑早期阶段的基因。我们发现,包括Trp53在内的促凋亡肿瘤抑制基因的缺失会增加畸胎瘤的坏死,将APOE脂质颗粒释放到细胞外环境中。浸润性T细胞被吸引到肿瘤坏死区域积聚脂质并变得功能失调。通过使线粒体通透性过渡孔(mPTP)失活,阻断T细胞脂质摄取或减少畸胎瘤坏死,可恢复免疫监视功能。由于小鼠畸胎瘤在脑组织中高度富集,我们接下来研究了人类胶质母细胞瘤(GBM)的肿瘤-免疫相互作用。事实上,tp53突变的人GBM中浸润的T细胞积累了APOE,并且功能失调。抗apoe和抗pdcd1抗体协同增强抗gbm免疫,延长小鼠生存期。我们的研究结果将mptp介导的肿瘤坏死与免疫逃避联系起来,并表明通过浸润免疫细胞靶向坏死肿瘤细胞释放的脂质摄取可以增强癌症免疫治疗。
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引用次数: 0
Autism-related proteins form a complex to maintain the striatal asymmetry in mice 自闭症相关蛋白形成复合体,维持小鼠纹状体的不对称性
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-09-02 DOI: 10.1038/s41422-025-01174-9
Yisheng Jiang, Feipeng Zhu, Jie Zhong, Xiaomei Sun, Yuting Yuan, Shuo Wang, Haiyang Chen, Zhiheng Xu
The brain’s hemispheres exhibit profound lateralization, yet the underlying mechanisms remain elusive. Using proteomic and phosphoproteomic analyses of the bilateral striatum — a hub for important brain functions and a common node of autism pathophysiology — we identified significant phosphorylation asymmetries. Particularly, the phosphorylation processes in the left striatum appear more prone to disturbance. Notably, SH3RF2, whose single-copy knockout leads to autism spectrum disorder (ASD)-like behaviors in mice, is uniquely expressed in the striatum, forming a complex with CaMKII (an ASD-associated protein) and PPP1CC. Loss of SH3RF2 disturbs the CaMKII/PP1 “switch”, resulting in hyperactivity of CaMKII and increased phosphorylation of its substrate GluR1. In Sh3rf2-deficient mice, heightened GluR1-Ser831 phosphorylation and its aberrant postsynaptic membrane localization in the left striatum may impair the functional lateralization of striatal neurons and contribute to autism-like behaviors. This study unveils the first molecular mechanism governing brain lateralization in mammals, linking its impairment to autism development and treatment strategies.
大脑的两个半球表现出深刻的偏侧化,但其潜在的机制仍然难以捉摸。通过对双侧纹状体的蛋白质组学和磷酸化蛋白质组学分析,我们发现了显著的磷酸化不对称。双侧纹状体是重要脑功能的中心,也是自闭症病理生理的共同节点。特别是,左纹状体的磷酸化过程似乎更容易受到干扰。值得注意的是,SH3RF2,其单拷贝敲除导致小鼠自闭症谱系障碍(ASD)样行为,在纹状体中唯一表达,与CaMKII(一种ASD相关蛋白)和PPP1CC形成复合物。SH3RF2的缺失扰乱了CaMKII/PP1“开关”,导致CaMKII过度活跃,其底物GluR1磷酸化增加。在sh3rp2缺失的小鼠中,左侧纹状体中GluR1-Ser831磷酸化的升高及其突触后膜定位的异常可能会损害纹状体神经元的功能侧化,并导致自闭症样行为。这项研究首次揭示了哺乳动物大脑偏侧化的分子机制,将其损伤与自闭症的发展和治疗策略联系起来。
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引用次数: 0
Structural insights into the vitamin K-dependent γ-carboxylation of osteocalcin 对维生素k依赖性骨钙素γ-羧化的结构见解
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-09-02 DOI: 10.1038/s41422-025-01161-0
Qing Cao, Jianjun Fan, Aaron Ammerman, Samjhana Awasthi, Zongtao Lin, Saimi Mierxiati, Huaping Chen, Jinbin Xu, Benjamin A. Garcia, Bin Liu, Weikai Li
The γ-carboxylation state of osteocalcin determines its essential functions in bone mineralization or systemic metabolism and serves as a prominent biomarker for bone health and vitamin K nutrition. This post-translational modification of glutamate residues is catalyzed by the membrane-embedded vitamin K-dependent γ-carboxylase (VKGC), which typically recognizes protein substrates through their tightly bound propeptide that triggers γ-carboxylation. However, the osteocalcin propeptide exhibits negligible affinity for VKGC. To understand the underlying molecular mechanism, we determined the cryo-electron microscopy structures of VKGC with osteocalcin carrying a native propeptide or a high-affinity variant at different carboxylation states. The structures reveal a large chamber in VKGC that maintains uncarboxylated and partially carboxylated osteocalcin in partially unfolded conformations, allowing their glutamate-rich region and C-terminal helices to engage with VKGC at multiple sites. Binding of this mature region together with the low-affinity propeptide effectively stimulates VKGC activity, similar to high-affinity propeptides that differ only in closely fitting interactions. However, the low-affinity propeptide renders osteocalcin prone to undercarboxylation at low vitamin K levels, thereby serving as a discernible biomarker. Overall, our studies reveal the unique interaction of osteocalcin with VKGC and provide a framework for designing therapeutic strategies targeting osteocalcin-related bone and metabolic disorders.
骨钙素的γ-羧化状态决定了其在骨矿化或全身代谢中的基本功能,是骨骼健康和维生素K营养的重要生物标志物。这种谷氨酸残基的翻译后修饰是由膜嵌入的维生素k依赖性γ-羧化酶(VKGC)催化的,该酶通常通过紧密结合的前肽来识别蛋白质底物,从而触发γ-羧化。然而,骨钙素前肽对VKGC的亲和力可以忽略不计。为了了解潜在的分子机制,我们测定了骨钙素携带天然前肽或高亲和力变体在不同羧化状态下的VKGC的冷冻电镜结构。这些结构揭示了VKGC中的一个大腔室,该腔室将未羧化和部分羧化的骨钙素维持在部分展开的构象中,允许其富含谷氨酸的区域和c端螺旋在多个位点与VKGC结合。这一成熟区域与低亲和力前肽结合可有效刺激VKGC活性,类似于高亲和力前肽,其区别仅在于紧密配合的相互作用。然而,低亲和力的前肽使骨钙素在低维生素K水平下易于羧化,从而作为可识别的生物标志物。总之,我们的研究揭示了骨钙素与VKGC的独特相互作用,并为设计针对骨钙素相关骨和代谢紊乱的治疗策略提供了框架。
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引用次数: 0
Modeling post-gastrula development via bidirectional pluripotent stem cells 通过双向多能干细胞模拟原肠胚后发育。
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-08-29 DOI: 10.1038/s41422-025-01172-x
Kuisheng Liu, Zihui Yan, Dandan Bai, Rui Jiang, Yan Bi, Xiangjun Ma, Jiani Xiang, Yifan Sheng, Baoxing Dong, Zhiyuan Ning, Shanru Yi, Yingdong Liu, Xinyi Lei, Yanping Jia, Yan Zhang, Yalin Zhang, Yanhe Li, Tao Wu, Chenxiang Xi, Shanyao Liu, Shuyi Liu, Jiayu Chen, Jiqing Yin, Xiaochen Kou, Yanhong Zhao, Hong Wang, Yixuan Wang, Ke Wei, Shaorong Gao, Wenqiang Liu
The absence of stem cells capable of efficiently generating both trophoblast and epiblast lineages has hindered precise recapitulation of embryonic development. Through high-content chemical screening, we established an (AS and LY) AL medium to generate mouse bidirectional pluripotent stem cells (BPSCs) characterized by concurrent expression of OCT4 and CDX2. Mouse BPSCs demonstrated highly plastic differentiation into trophoblast, epiblast and primitive endoderm (PrE) lineages in vitro within 48 h without exogenous inducing factors and efficiently contributed to embryonic and extraembryonic tissues in vivo. Mechanistically, hyperactivation of the Wnt signaling pathway breaks the early lineage differentiation barrier by initiating a Lef1-dependent bypass. Remarkably, integration of BPSCs with PrE induction system enables high-efficiency generation of E8.5-stage embryo models. These advanced models complete gastrulation and recapitulate definitive developmental milestones including brain morphogenesis, neural tube closure, cardiac contraction, somite patterning, and primordial germ cell specification. Moreover, human cells cultured under AL conditions acquire an OCT4 and CDX2 double-positive state and corresponding gene expression profiles, revealing conserved functionality of this culturing platform across species. These findings highlight BPSCs as a powerful tool for investigating early lineage specification and post-gastrulation embryonic development.
缺乏能够有效地产生滋养细胞和外胚层谱系的干细胞阻碍了胚胎发育的精确再现。通过高含量的化学筛选,我们建立了一种(AS和LY) AL培养基,用于生成以OCT4和CDX2同时表达为特征的小鼠双向多能干细胞(BPSCs)。小鼠BPSCs在体外无外源诱导的情况下,可在48 h内高度分化为滋养细胞、外胚层和原始内胚层(PrE)谱系,并在体内有效地促进胚胎和胚胎外组织的形成。机制上,Wnt信号通路的过度激活通过启动lef1依赖性旁路打破了早期谱系分化障碍。值得注意的是,将bpsc与PrE诱导系统相结合,可以高效地生成e8.5期胚胎模型。这些先进的模型完成了原肠胚形成,概括了最终的发育里程碑,包括脑形态发生,神经管闭合,心脏收缩,体模式和原始生殖细胞规范。此外,在AL条件下培养的人类细胞获得OCT4和CDX2双阳性状态和相应的基因表达谱,揭示了该培养平台跨物种的保守功能。这些发现强调了bpsc作为研究早期谱系规范和原肠胚形成后胚胎发育的有力工具。
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引用次数: 0
Novel organoid culture condition: modeling fetal-like plasticity in colorectal cancer 新型类器官培养条件:模拟结直肠癌胎儿样可塑性。
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-08-29 DOI: 10.1038/s41422-025-01170-z
Chao Wu, Min Jung Kim, J. Joshua Smith
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引用次数: 0
Sabotaging TCR signaling—LAG3 interferes with the CD3ε–LCK interaction 破坏TCR信号- lag3干扰CD3ε-LCK相互作用。
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-08-22 DOI: 10.1038/s41422-025-01168-7
Gina J. Fiala, Wolfgang W. Schamel
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引用次数: 0
A decade of migrasome research: biogenesis, physiological functions, and disease implications 十年来偏头痛研究:生物发生、生理功能和疾病影响。
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-08-22 DOI: 10.1038/s41422-025-01153-0
Jinqiang Yu, Li Yu
Since their first report a decade ago, our understanding of migrasomes — specialized organelles initially identified in migrating cells—has advanced considerably. Researchers have elucidated key aspects of migrasome biology, including the mechanisms of their biogenesis, their roles in cellular physiology, and their implications in various diseases. Concurrently, the development of a robust toolkit for migrasome analysis has transformed these structures from mere microscopy curiosities into central players in an emerging field with significant impact on cell biology, developmental biology, immunology, and disease pathology. This review provides a comprehensive summary of current insights into migrasome biology, with a particular focus on the molecular mechanisms governing their formation and their established cellular and physiological functions. In addition, we highlight the current challenges and unresolved questions that continue to shape and propel future research in this exciting area of study.
自从十年前他们的第一份报告以来,我们对迁移体(最初在迁移细胞中发现的特化细胞器)的理解有了很大的进步。研究人员已经阐明了迁移体生物学的关键方面,包括它们的生物发生机制,它们在细胞生理学中的作用,以及它们在各种疾病中的意义。同时,一个强大的迁移体分析工具包的发展已经将这些结构从单纯的显微镜好奇心转变为对细胞生物学、发育生物学、免疫学和疾病病理学产生重大影响的新兴领域的核心参与者。本文综述了目前对迁移体生物学的深入研究,重点介绍了迁移体形成的分子机制及其已建立的细胞和生理功能。此外,我们还强调了当前的挑战和未解决的问题,这些问题将继续塑造和推动这一令人兴奋的研究领域的未来研究。
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引用次数: 0
Broad-spectrum plant immunity: engineering pathogen protease-activated autoactive NLRs 广谱植物免疫:工程病原体蛋白酶激活的自体NLRs。
IF 25.9 1区 生物学 Q1 CELL BIOLOGY Pub Date : 2025-08-20 DOI: 10.1038/s41422-025-01169-6
Qibin Wu, Wanying Zhao, Zheng Qing Fu, Youxiong Que
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引用次数: 0
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Cell Research
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