当前共找到 1275 篇文献分享,本页显示第 541 - 560 篇。
541.
Spring
(2023-07-31 19:40):
#paper doi: 10.1016/j.chom.2023.06.009
Circulating T cell profiles associate with enterotype signatures underlying hematological malignancy relapses
① 纳入55名接受阿奇霉素(27名)或安慰剂(28名)治疗的患者,收集粪便样本,分析肠道菌群、病毒组和代谢组的时间特征;② 描述四种肠道类型以及相关的细菌噬菌体种群和代谢途径网络;③ 其中一种肠型与持续缓解相关,拟杆菌属的一种分类单元与复发相关,拟杆菌属和普雷沃氏菌属的两种分类单元与完全缓解相关;④ 分类单元与脂质、戊糖和支链氨基酸代谢途径和几种噬菌体种群相关;⑤ 肠型和分类单元与耗竭T细胞和循环免疫细胞的功能状态相关。
Abstract:
Early administration of azithromycin after allogeneic hematopoietic stem cell transplantation was shown to increase the relapse of hematological malignancies. To determine the impact of azithromycin on the post-transplant gut ecosystem …
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Early administration of azithromycin after allogeneic hematopoietic stem cell transplantation was shown to increase the relapse of hematological malignancies. To determine the impact of azithromycin on the post-transplant gut ecosystem and its influence on relapse, we characterized overtime gut bacteriome, virome, and metabolome of 55 patients treated with azithromycin or a placebo. We describe four enterotypes and the network of associated bacteriophage species and metabolic pathways. One enterotype associates with sustained remission. One taxon from Bacteroides specifically associates with relapse, while two from Bacteroides and Prevotella correlate with complete remission. These taxa are associated with lipid, pentose, and branched-chain amino acid metabolic pathways and several bacteriophage species. Enterotypes and taxa associate with exhausted T cells and the functional status of circulating immune cells. These results illustrate how an antibiotic influences a complex network of gut bacteria, viruses, and metabolites and may promote cancer relapse through modifications of immune cells.
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542.
小年
(2023-07-31 19:35):
#paper https://doi.org/10.1038/ncomms13404 Direct identification of clinically relevant neoepitopes presented on native human melanoma tissue by mass spectrometry
这篇研究采用高灵敏度质谱技术,对25名黑色素瘤患者的原发肿瘤组织进行了全面的免疫肽谱学分析,发现了近10万个肿瘤相关肽段。研究团队还首次直接鉴定了携带突变的肽段,其中11个突变肽段在患者样本中得到证实。这些突变肽段中有4个显示出免疫原性,能够诱导患者体内T细胞产生针对癌症的免疫反应。这表明直接通过质谱技术识别突变肽段是寻找个性化肿瘤免疫治疗靶点的有效方法。此外,研究还在未富集的样本中检测到磷酸化肽段,为未来研发癌症免疫治疗提供了潜在目标。虽然该方法灵敏度仍需改进,但研究结果为癌症免疫治疗提供了重要的启示和新方向。
Abstract:
Although mutations may represent attractive targets for immunotherapy, direct identification of mutated peptide ligands isolated from human leucocyte antigens (HLA) on the surface of native tumour tissue has so far …
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Although mutations may represent attractive targets for immunotherapy, direct identification of mutated peptide ligands isolated from human leucocyte antigens (HLA) on the surface of native tumour tissue has so far not been successful. Using advanced mass spectrometry (MS) analysis, we survey the melanoma-associated immunopeptidome to a depth of 95,500 patient-presented peptides. We thereby discover a large spectrum of attractive target antigen candidates including cancer testis antigens and phosphopeptides. Most importantly, we identify peptide ligands presented on native tumour tissue samples harbouring somatic mutations. Four of eleven mutated ligands prove to be immunogenic by neoantigen-specific T-cell responses. Moreover, tumour-reactive T cells with specificity for selected neoantigens identified by MS are detected in the patient's tumour and peripheral blood. We conclude that direct identification of mutated peptide ligands from primary tumour material by MS is possible and yields true neoepitopes with high relevance for immunotherapeutic strategies in cancer.
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543.
庞庞
(2023-07-31 19:14):
#paper doi:10.1038/s41380-021-01247-2, Disrupted intrinsic functional brain topology in patients with major depressive disorder 之前人们去比较抑郁症和正常人大脑功能的拓扑差异,结果多有不同。这可能是因为数据量不够的原因。严超赣课题组使用了16个站点的821名MDD患者和765名正常对照,发现与正常人相比,抑郁症患者的全局和局部效率降低。在节点水平上,患者感觉运动网络(SMN)、背侧注意网络(DAN)和视觉网络(VN)的节点度降低,默认模式网络(DMN)、SMN、DAN和VN的节点效率降低。
Abstract:
Aberrant topological organization of whole-brain networks has been inconsistently reported in studies of patients with major depressive disorder (MDD), reflecting limited sample sizes. To address this issue, we utilized a …
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Aberrant topological organization of whole-brain networks has been inconsistently reported in studies of patients with major depressive disorder (MDD), reflecting limited sample sizes. To address this issue, we utilized a big data sample of MDD patients from the REST-meta-MDD Project, including 821 MDD patients and 765 normal controls (NCs) from 16 sites. Using the Dosenbach 160 node atlas, we examined whole-brain functional networks and extracted topological features (e.g., global and local efficiency, nodal efficiency, and degree) using graph theory-based methods. Linear mixed-effect models were used for group comparisons to control for site variability; robustness of results was confirmed (e.g., multiple topological parameters, different node definitions, and several head motion control strategies were applied). We found decreased global and local efficiency in patients with MDD compared to NCs. At the nodal level, patients with MDD were characterized by decreased nodal degrees in the somatomotor network (SMN), dorsal attention network (DAN) and visual network (VN) and decreased nodal efficiency in the default mode network (DMN), SMN, DAN, and VN. These topological differences were mostly driven by recurrent MDD patients, rather than first-episode drug naive (FEDN) patients with MDD. In this highly powered multisite study, we observed disrupted topological architecture of functional brain networks in MDD, suggesting both locally and globally decreased efficiency in brain networks.
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544.
符毓
(2023-07-31 16:41):
#paper doi: 10.48550/arXiv.2307.05973 2023, Composable 3D Value Maps for Robotic Manipulation with Language Models.
李飞飞团队最新论文研究,把语言模型与机器人操作结合。与大语言模型结合后人机交互效率得到提高,并且能做到基于视觉的实时轨迹规划。目测机械臂移动速率为常见机械臂工作速率的八分之一,到真实应用的话稳定性还需要进一步提高(超过25%的出错率)
arXiv,
2023.
DOI: 10.48550/arXiv.2307.05973
Abstract:
Large language models (LLMs) are shown to possess a wealth of actionable knowledge that can be extracted for robot manipulation in the form of reasoning and planning. Despite the progress, …
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Large language models (LLMs) are shown to possess a wealth of actionable knowledge that can be extracted for robot manipulation in the form of reasoning and planning. Despite the progress, most still rely on pre-defined motion primitives to carry out the physical interactions with the environment, which remains a major bottleneck. In this work, we aim to synthesize robot trajectories, i.e., a dense sequence of 6-DoF end-effector waypoints, for a large variety of manipulation tasks given an open-set of instructions and an open-set of objects. We achieve this by first observing that LLMs excel at inferring affordances and constraints given a free-form language instruction. More importantly, by leveraging their code-writing capabilities, they can interact with a visual-language model (VLM) to compose 3D value maps to ground the knowledge into the observation space of the agent. The composed value maps are then used in a model-based planning framework to zero-shot synthesize closed-loop robot trajectories with robustness to dynamic perturbations. We further demonstrate how the proposed framework can benefit from online experiences by efficiently learning a dynamics model for scenes that involve contact-rich interactions. We present a large-scale study of the proposed method in both simulated and real-robot environments, showcasing the ability to perform a large variety of everyday manipulation tasks specified in free-form natural language. Project website: this https URL
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545.
Vincent
(2023-07-31 14:42):
#paper Deep learning-based prediction of the T cell receptor–antigen binding specificity https://doi.org/10.1038/s42256-021-00383-2 2021 nature machine intelligence. 肿瘤新抗原在T细胞识别肿瘤细胞的过程中发挥着重要的作用,肿瘤新抗原与T细胞受体的结合与相互作用预测一直备受关注,然而相关的实验与计算方法一直有诸多不足,可验证性也很差。这篇文章开发了一套基于迁移学习的机器学习方法pMTnet,来预测抗原MHC结合物与T细胞受体的结合能力。通过将pMTnet运用到人的肿瘤基因组数据上,发现肿瘤新抗原比自身抗原的免疫原性更高,拥有对肿瘤新抗原结合能力强的T细胞克隆的病人在免疫治疗中有更好的预后和治疗效果。
IF:18.800Q1
Nature machine intelligence,
2021-Oct.
DOI: 10.1038/s42256-021-00383-2
PMID: 36003885
PMCID:PMC9396750
Abstract:
Neoantigens play a key role in the recognition of tumor cells by T cells. However, only a small proportion of neoantigens truly elicit T cell responses, and fewer clues exist …
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Neoantigens play a key role in the recognition of tumor cells by T cells. However, only a small proportion of neoantigens truly elicit T cell responses, and fewer clues exist as to which neoantigens are recognized by which T cell receptors (TCRs). We built a transfer learning-based model, named pMHC-TCR binding prediction network (pMTnet), to predict TCR-binding specificities of neoantigens, and T cell antigens in general, presented by class I major histocompatibility complexes (pMHCs). pMTnet was comprehensively validated by a series of analyses, and showed advance over previous work by a large margin. By applying pMTnet in human tumor genomics data, we discovered that neoantigens were generally more immunogenic than self-antigens, but HERV-E, a special type of self-antigen that is re-activated in kidney cancer, is more immunogenic than neoantigens. We further discovered that patients with more clonally expanded T cells exhibiting better affinity against truncal, rather than subclonal, neoantigens, had more favorable prognosis and treatment response to immunotherapy, in melanoma and lung cancer but not in kidney cancer. Predicting TCR-neoantigen/antigen pairs is one of the most daunting challenges in modern immunology. However, we achieved an accurate prediction of the pairing only using the TCR sequence (CDR3β), antigen sequence, and class I MHC allele, and our work revealed unique insights into the interactions of TCRs and pMHCs in human tumors using pMTnet as a discovery tool.
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546.
周周复始
(2023-07-31 13:03):
#paper The Minimal Preprocessing Pipelines for the Human Connectome Project. DOI: 10.1016/j.neuroimage.2013.04.127.人类连接组计划(HCP)面临着将多种磁共振成像(MRI)模式整合到一个跨越大量受试者的通用自动化预处理框架中的挑战性任务。HCP获得的MRI数据在许多方面与传统的3特斯拉扫描仪获得的数据不同,并且通常需要新开发的预处理方法。本文描述了由HCP开发的用于结构、功能和扩散MRI的最小预处理管道,以完成许多低级任务,包括空间伪影/失真去除、表面生成、跨模态配准以及与标准空间对齐。这些管道是专门设计用来利用HCP提供的高质量数据的。最后的标准空间使用了最近引入的CIFTI文件格式和相关的灰坐标空间坐标系统。这允许结合皮质表面和皮质下体积分析,同时减少高空间和时间分辨率数据的存储和处理要求。本文提供了HCP最小预处理管道的最低图像采集要求,并为有兴趣复制HCP采集协议或使用这些管道的研究人员提供了额外的建议。最后讨论了管道的一些潜在的未来改进。
Abstract:
The Human Connectome Project (HCP) faces the challenging task of bringing multiple magnetic resonance imaging (MRI) modalities together in a common automated preprocessing framework across a large cohort of subjects. …
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The Human Connectome Project (HCP) faces the challenging task of bringing multiple magnetic resonance imaging (MRI) modalities together in a common automated preprocessing framework across a large cohort of subjects. The MRI data acquired by the HCP differ in many ways from data acquired on conventional 3 Tesla scanners and often require newly developed preprocessing methods. We describe the minimal preprocessing pipelines for structural, functional, and diffusion MRI that were developed by the HCP to accomplish many low level tasks, including spatial artifact/distortion removal, surface generation, cross-modal registration, and alignment to standard space. These pipelines are specially designed to capitalize on the high quality data offered by the HCP. The final standard space makes use of a recently introduced CIFTI file format and the associated grayordinate spatial coordinate system. This allows for combined cortical surface and subcortical volume analyses while reducing the storage and processing requirements for high spatial and temporal resolution data. Here, we provide the minimum image acquisition requirements for the HCP minimal preprocessing pipelines and additional advice for investigators interested in replicating the HCP's acquisition protocols or using these pipelines. Finally, we discuss some potential future improvements to the pipelines.
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547.
钟鸣
(2023-07-30 10:58):
#paper doi:10.1128/iai.00037-23 Identification of Virulence Factors Involved in a Murine Model of Severe Achromobacter xylosoxidans Infection
本文使用正常鼠、免疫低下鼠、正常毒株、弱毒株进行攻毒实验,以此研究木糖氧化无色杆菌(Ax)的毒力影响因素。核心结论是,插入突变研究结果表明, III 型分泌系统、Vi 胶囊、antisigma-E 因子,以及ArtA 粘附素是影响毒力强弱的主要因素。
Abstract:
Achromobacter xylosoxidans (Ax) is an opportunistic pathogen and causative agent of numerous infections particularly in immunocompromised individuals with increasing prevalence in cystic fibrosis (CF). To date, investigations have focused on …
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Achromobacter xylosoxidans (Ax) is an opportunistic pathogen and causative agent of numerous infections particularly in immunocompromised individuals with increasing prevalence in cystic fibrosis (CF). To date, investigations have focused on the clinical epidemiology and genomic comparisons of Ax isolates, yet little is known about disease pathology or the role that specific virulence factors play in tissue invasion or damage. Here, we model an acute Ax lung infection in immunocompetent C57BL/6 mice and immunocompromised CF mice, revealing a link between cytotoxicity and disease in an intact host. Mice were intratracheally challenged with sublethal doses of a cytotoxic (GN050) or invasive (GN008) strain of Ax. Bacterial burden, immune cell populations, and inflammatory markers in bronchoalveolar lavage fluid and lung homogenates were measured at different time points to assess disease severity. CF mice had a similar but delayed immune response toward both Ax strains compared to C57BL/6J mice. GN050 caused more severe disease and higher mortality which correlated with greater bacterial burden and increased proinflammatory responses in both mouse models. In agreement with the cytotoxicity of GN050 toward macrophages , mice challenged with GN050 had fewer macrophages. Mutants with transposon insertions in predicted virulence factors of GN050 showed that disease severity depended on the type III secretion system, Vi capsule, antisigma-E factor, and partially on the ArtA adhesin. The development of an acute infection model provides an essential tool to better understand the infectivity of diverse Ax isolates and enable improved identification of virulence factors important to bacterial persistence and disease.
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548.
惊鸿
(2023-07-29 17:48):
#paper CAR T therapy beyond cancer: the evolution of a living drug DOI : 10.1038/s41586-023-06243-w 2023-07-26 通过改造患者自身的 T 细胞来选择性地靶向并消除肿瘤细胞,已经治愈了患有无法治疗的血液癌症的患者。这些结果推动了嵌合抗原受体 (CAR) T 疗法在整个肿瘤学领域的应用。然而,临床和临床前研究的证据强调了 CAR T 疗法在肿瘤学之外治疗自身免疫、慢性感染、心脏纤维化、衰老相关疾病和其他疾病方面的潜力。同时,新技术和平台的部署为 CAR T 疗法应用于非癌症病理提供了进一步的机会。在这里,我们回顾了 CAR T 疗法背后的基本原理、当前肿瘤学面临的挑战、非癌症疾病初步报告的概要,以及对相关新兴技术的讨论。我们研究了这种疗法在各种情况下的潜在应用。最后,我们强调了对特异性和安全性的担忧,并概述了 CAR T 疗法超越癌症的前进道路。
Abstract:
Engineering a patient's own T cells to selectively target and eliminate tumour cells has cured patients with untreatable haematologic cancers. These results have energized the field to apply chimaeric antigen …
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Engineering a patient's own T cells to selectively target and eliminate tumour cells has cured patients with untreatable haematologic cancers. These results have energized the field to apply chimaeric antigen receptor (CAR) T therapy throughout oncology. However, evidence from clinical and preclinical studies underscores the potential of CAR T therapy beyond oncology in treating autoimmunity, chronic infections, cardiac fibrosis, senescence-associated disease and other conditions. Concurrently, the deployment of new technologies and platforms provides further opportunity for the application of CAR T therapy to noncancerous pathologies. Here we review the rationale behind CAR T therapy, current challenges faced in oncology, a synopsis of preliminary reports in noncancerous diseases, and a discussion of relevant emerging technologies. We examine potential applications for this therapy in a wide range of contexts. Last, we highlight concerns regarding specificity and safety and outline the path forward for CAR T therapy beyond cancer.
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549.
DeDe宝
(2023-07-29 14:54):
#paper Language network lateralization is reflected throughout the macroscale functional
organization of cortex doi:10.1038/s41467-023-39131-y
半球偏侧化是人类大脑组织的一个基本特征。虽然大多数人表现出左半球语言优势,但相当一部分人口表现出反向偏侧化。利用来自HCP的双胞胎和家庭数据,本研究为语言偏侧化在大脑皮层宏观功能组织中的反映提供证据。分析表明,语言的侧化和梯度不对称在一定程度上是由遗传因素驱动的。这些发现为更深入地理解大脑半球偏侧化的种群水平变异和皮层组织的整体属性之间的起源和关系铺平了道路。
Abstract:
Hemispheric specialization is a fundamental feature of human brain organization. However, it is not yet clear to what extent the lateralization of specific cognitive processes may be evident throughout the …
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Hemispheric specialization is a fundamental feature of human brain organization. However, it is not yet clear to what extent the lateralization of specific cognitive processes may be evident throughout the broad functional architecture of cortex. While the majority of people exhibit left-hemispheric language dominance, a substantial minority of the population shows reverse lateralization. Using twin and family data from the Human Connectome Project, we provide evidence that atypical language dominance is associated with global shifts in cortical organization. Individuals with atypical language organization exhibit corresponding hemispheric differences in the macroscale functional gradients that situate discrete large-scale networks along a continuous spectrum, extending from unimodal through association territories. Analyses reveal that both language lateralization and gradient asymmetries are, in part, driven by genetic factors. These findings pave the way for a deeper understanding of the origins and relationships linking population-level variability in hemispheric specialization and global properties of cortical organization.
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550.
李翛然
(2023-07-28 15:19):
#paper Role of neuroinflammation in neurodegeneration development doi:10.3892/mmr.2016.4948 这是一篇综述,陕西师范大学夏海滨/张伟锋教授团队,主要介绍炎症 神经退行病变之间的关联和联系,介绍了目前被生物信息及试验验证的一些总结,以及正在临床方面的进展。 总体来说,就是目前从国际上,越来越认可很多的严重疾病,比如神经退行病变,癌症的初始诱因都是炎症的持续发展,免疫系统的混乱以及细胞功能的变化。 从药物公司的角度来说,我有一个横向的很好的对比思路。 这个器官及细胞炎症的症候很能对应起中医的“湿气”,然而调控所谓的“湿气”其实就是把免疫系统调节正常。 免疫是一个直到目前为止,西方医学理论都没有完整的体系化解释清楚的一个大的系统性问题。 等待AI和更多的生物信息学介入,会让生物带来全新的革命。 至少这几年卖的最好的药 基本都是 单抗和细胞治疗,本质上都是免疫调节。
Abstract:
Neurodegeneration is a phenomenon that occurs in the central nervous system through the hallmarks associating the loss of neuronal structure and function. Neurodegeneration is observed after viral insult and mostly …
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Neurodegeneration is a phenomenon that occurs in the central nervous system through the hallmarks associating the loss of neuronal structure and function. Neurodegeneration is observed after viral insult and mostly in various so-called 'neurodegenerative diseases', generally observed in the elderly, such as Alzheimer's disease, multiple sclerosis, Parkinson's disease and amyotrophic lateral sclerosis that negatively affect mental and physical functioning. Causative agents of neurodegeneration have yet to be identified. However, recent data have identified the inflammatory process as being closely linked with multiple neurodegenerative pathways, which are associated with depression, a consequence of neurodegenerative disease. Accordingly, pro‑inflammatory cytokines are important in the pathophysiology of depression and dementia. These data suggest that the role of neuroinflammation in neurodegeneration must be fully elucidated, since pro‑inflammatory agents, which are the causative effects of neuroinflammation, occur widely, particularly in the elderly in whom inflammatory mechanisms are linked to the pathogenesis of functional and mental impairments. In this review, we investigated the role played by the inflammatory process in neurodegenerative diseases.
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551.
徐炳祥
(2023-07-26 17:11):
#paper doi: 10.1016/j.tem.2011.10.001. Trends in Endocrinology and Metabolism, 2012, Transcriptional networks and chromatin remodeling controlling adipogenesis。脂肪生成过程受一系列转录因子和表观遗传信号的控制,从而在时间上形成多波次的级联调控关系。此过程不仅是代谢研究的核心,也是表观遗传研究的重要载体。这篇旧文对脂肪生成过程中重要的转录因子的行为和调控关系,及其与其他表观信号的关系进行了梳理,并按照脂肪分化过程早期和晚期分别进行了系统性介绍。受限于时代,文中未涉及染色质空间构象和启动子-增强子相互作用的内容,但其主要观点至今仍有重要的参考价值。
Trends in endocrinology and metabolism: TEM,
2012-Feb.
DOI: 10.1016/j.tem.2011.10.001
PMID: 22079269
Abstract:
Adipocyte differentiation is tightly controlled by a transcriptional cascade, which directs the extensive reprogramming of gene expression required to convert fibroblast-like precursor cells into mature lipid-laden adipocytes. Recent global analyses …
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Adipocyte differentiation is tightly controlled by a transcriptional cascade, which directs the extensive reprogramming of gene expression required to convert fibroblast-like precursor cells into mature lipid-laden adipocytes. Recent global analyses of transcription factor binding and chromatin remodeling have revealed 'snapshots' of this cascade and the chromatin landscape at specific time-points of differentiation. These studies demonstrate that multiple adipogenic transcription factors co-occupy hotspots characterized by an open chromatin structure and specific epigenetic modifications. Such transcription factor hotspots are likely to represent key signaling nodes which integrate multiple adipogenic signals at specific chromatin sites, thereby facilitating coordinated action on gene expression.
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552.
颜林林
(2023-07-25 00:17):
#paper doi:10.1038/s41588-023-01452-5. Nature Genetics, 2023, Crosstalk between RNA m6A and DNA methylation regulates transposable element chromatin activation and cell fate in human pluripotent stem cells. 这篇文章开发了一种名为CARGO-BioID的方法,基于CRISPR技术 和 蛋白质邻位连接技术(Proximity Ligation Assay,PLA),能够抓取与基因组上特定转座元件(Transposable elements,TEs)区域序列相结合的蛋白,并通过质谱和ChIP-seq等实验,对这些蛋白进行鉴定和定量检测。文章以LTR7/HRV-H为目标,这是个灵长目特有的TE序列,通过上述技术方法,识别出与之结合的蛋白,其中包括 YTHDC2 和 TET1 这两个蛋白,前者是RNA m6A甲基化的读取器(reader),后者则是DNA 5mC甲基化的去甲基酶。随后,文章又利用一系列细胞实验,证实了这两个蛋白在该基因组区域上的生物学作用,包括相应的RNA甲基化与DNA甲基化之间的相互作用(crosstalk)、它们对TE活性的调控、以及对hPSC(人多能干细胞)分化命运的影响等。
Abstract:
Transposable elements (TEs) are parasitic DNA sequences accounting for over half of the human genome. Tight control of the repression and activation states of TEs is critical for genome integrity, …
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Transposable elements (TEs) are parasitic DNA sequences accounting for over half of the human genome. Tight control of the repression and activation states of TEs is critical for genome integrity, development, immunity and diseases, including cancer. However, precisely how this regulation is achieved remains unclear. Here we develop a targeted proteomic proximity labeling approach to capture TE-associated proteins in human embryonic stem cells (hESCs). We find that the RNA N-methyladenosine (mA) reader, YTHDC2, occupies genomic loci of the primate-specific TE, LTR7/HERV-H, specifically through its interaction with mA-modified HERV-H RNAs. Unexpectedly, YTHDC2 recruits the DNA 5-methylcytosine (5mC)-demethylase, TET1, to remove 5mC from LTR7/HERV-H and prevent epigenetic silencing. Functionally, the YTHDC2/LTR7 axis inhibits neural differentiation of hESCs. Our results reveal both an underappreciated crosstalk between RNA mA and DNA 5mC, the most abundant regulatory modifications of RNA and DNA in eukaryotes, and the fact that in hESCs this interplay controls TE activity and cell fate.
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553.
龙海晨
(2023-07-11 02:13):
#paper Sun M, Ji H, Xu N, Jiang P, Qu T, Li Y. Real-world data analysis of immune checkpoint inhibitors in stage III-IV adenocarcinoma and squamous cell carcinoma. BMC Cancer. 2022 Jul 13;22(1):762. doi: 10.1186/s12885-022-09843-3. PMID: 35831785; PMCID: PMC9277844. 这是一篇临床上回顾性研究肺癌的文章,主要研究对象:III-IV期肺腺癌和鳞状细胞癌患者。使用免疫检查点抑制剂immune checkpoint inhibitors (ICIs)方法治疗后的情况。对315名患者使用ICIs疗法,并对患者进行评估,发现,ICIs对肺癌患者有良好的疗效,显著提高了患者生存期中位数,也缓解了症状。从结果数据看,使用ICIs也存在不良反应。
Abstract:
Abstract Background This study was designed to investigate the clinical application, efficacy, and safety of immune checkpoint inhibitors (ICIs) in the treatment of lung cancer in the real world. Methods …
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Abstract Background This study was designed to investigate the clinical application, efficacy, and safety of immune checkpoint inhibitors (ICIs) in the treatment of lung cancer in the real world. Methods A retrospective, observational analysis was conducted on patients treated with ICIs in four tertiary hospitals in the region from January 2015 to March 2021, to evaluate the clinical efficacy of ICIs single-agent or combined chemotherapy and anti-vascular drugs in the first-line or second-line treatment of patients with lung cancer. Results Three hundred and fifteen patients were enrolled in this study. In patients with stage III-IV adenocarcinoma and Squamous cell carcinoma, the objective response rate (ORR) and disease control rate (DCR) were 35.5% (87/245) and 93.5% (229/245), respectively, the median progression-free survival (PFS) was 10.8 months, and the median overall survival (OS) was not reached. A total of 132 patients received ICIs as the first-line treatment, the median treatment cycle was 8 cycles (2–20 cycles), the short-term efficacy ORR was 38.6%, DCR was 93.9%, and the median PFS was 11.4 months. One hundred thirteen patients received ICIs treatment as second-line treatment, the median treatment cycle was five cycles (2–10 cycles), the short-term efficacy ORR was 31.9%, DCR was 92.9%, and the median PFS was 10.0 months. There were no statistically significant differences in ORR, DCR, or median PFS with ICIs as the first-line treatment compared with the second-line treatment(P > 0.05). The results of subgroup analysis showed that Eastern Cooperative Oncology Group performance status (ECOG PS), epidermal growth factor receptor (EGFR) mutation status, pathological type and number of treatment lines were not correlated with median PFS(P > 0.05). However, there were statistically significant differences in programmed death-ligand 1(PD-L1) expression, corticosteroid interference, and antibiotic (Abx) treatment among all groups (P < 0.05). In terms of safety, the overall incidence of adverse reactions in 315 patients was 62.5%, and the incidence of immune-related adverse events (irAEs) was 13.7%. Grade 1–2 and 3–4 incidence of adverse events were 34.9 and 27.65%, respectively. There were four patients who experienced fatal irAEs, two cases were liver damage leading to liver failure, one case was immune related pneumonia, and one case was immune related myocarditis. Conclusion In the real world, ICIs has a good effect on patients with lung cancer and significantly improves ORR and PFS.
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554.
AI 5.0.3
(2023-06-30 23:56):
#paper doi:10.1038/s41398-023-02471-w Both reactive and proactive control are deficient in children with ADHD and predictive of clinical symptoms.这篇文献介绍了ADHD儿童反应性控制和主动控制都相较于TD儿童出现了显著下降
Abstract:
Cognitive control deficits are a hallmark of attention deficit hyperactivity disorder (ADHD) in children. Theoretical models posit that cognitive control involves reactive and proactive control processes but their distinct roles …
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Cognitive control deficits are a hallmark of attention deficit hyperactivity disorder (ADHD) in children. Theoretical models posit that cognitive control involves reactive and proactive control processes but their distinct roles and inter-relations in ADHD are not known, and the contributions of proactive control remain vastly understudied. Here, we investigate the dynamic dual cognitive control mechanisms associated with both proactive and reactive control in 50 children with ADHD (16F/34M) and 30 typically developing (TD) children (14F/16M) aged 9-12 years across two different cognitive controls tasks using a within-subject design. We found that while TD children were capable of proactively adapting their response strategies, children with ADHD demonstrated significant deficits in implementing proactive control strategies associated with error monitoring and trial history. Children with ADHD also showed weaker reactive control than TD children, and this finding was replicated across tasks. Furthermore, while proactive and reactive control functions were correlated in TD children, such coordination between the cognitive control mechanisms was not present in children with ADHD. Finally, both reactive and proactive control functions were associated with behavioral problems in ADHD, and multi-dimensional features derived from the dynamic dual cognitive control framework predicted inattention and hyperactivity/impulsivity clinical symptoms. Our findings demonstrate that ADHD in children is characterized by deficits in both proactive and reactive control, and suggest that multi-componential cognitive control measures can serve as robust predictors of clinical symptoms.
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555.
彬
(2023-06-30 23:50):
#paper doi: 10.3168/jds.2022-22540. Effect of diets enriched in n-6 or n-3 fatty acid on dry matter intake, energy balance, oxidative stress, and milk fat profile of transition cows. 这篇文献表明增加日粮中n-3 PUFA的含量可以增加过渡期奶牛的DMI和产后的产奶量。与产后补充饲喂n-6 PUFA相比,补充饲喂n-3 PUFA能更有效地缓解产后净能量平衡。同时补充饲喂n-3 PUFA可以降低牛乳中n-6 PUFA/n-3 PUFA的比例,该作者推测这可能是生产有益于人体健康食物的一种策略。
Abstract:
The objective of this study was to determine the effect of dietary supplementation of n-3 polyunsaturated fatty acids (PUFA) and n-6 PUFA on dry matter intake (DMI), energy balance, oxidative …
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The objective of this study was to determine the effect of dietary supplementation of n-3 polyunsaturated fatty acids (PUFA) and n-6 PUFA on dry matter intake (DMI), energy balance, oxidative stress, and performance of transition cows. Forty-five multiparous Holstein dairy cows with similar parity, body weight (BW), body condition score (BCS), and milk yield were used in a completely randomized design during a 56-d experimental period including 28 d prepartum and 28 d postpartum. At 240 d of pregnancy, cows were randomly assigned to one of the 3 isoenergetic and isoprotein dietary treatments, including a control ration containing 1% hydrogenated fatty acid (CON), a ration with 8% extruded soybean (HN6, high n-6 PUFA source), and a ration with 3.5% extruded flaxseed (HN3; high n-3 PUFA source). The HN6 and HN3 diets had an n-6/n-3 ratio of 3.05:1 and 0.64:1 in prepartum cows and 8.16:1 and 1.59:1 in postpartum cows, respectively. During the prepartum period (3, 2, and 1 wk before calving), DMI, DMI per unit of BW, total net energy intake, and net energy balance were higher in the HN3 than in the CON and NH6 groups. During the postpartum period (2, 3, and 4 wk after calving), cows fed HN3 and HN6 diets both showed increasing DMI, DMI as a percentage of BW, and total net energy intake compared with those fed the CON diet. The BW of calves in the HN3 group was 12.91% higher than those in the CON group. Yield and nutrient composition of colostrum (first milking after calving) were not affected by HN6 or HN3 but milk yield from 1 to 4 wk of milking was significantly improved compared with CON. During the transition period, BW, BCS, and BCS changes were not affected. Cows fed the HN6 diet had a higher plasma NEFA concentration compared with the CON cows during the prepartum period. Feeding HN3 reduced the proportion of de novo fatty acids and increased the proportion of preformed long-chain fatty acids in regular milk. In addition, the n-3 PUFA-enriched diet reduced the n-6/n-3 PUFA ratio in milk. In conclusion, increasing the n-3 fatty acids concentration in the diet increased both DMI during the transition period and milk production after calving, and supplementing n-3 fatty acids was more effective in mitigating the net energy balance after calving.
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556.
Ricardo
(2023-06-30 23:49):
#paper Denoising Diffusion Probabilistic Models.
doi: https://doi.org/10.48550/arXiv.2006.11239 大名鼎鼎的DDPM模型,算法结构出奇的简单,分为前向加噪过程和反向去噪过程。前向加噪过程是通过在多个时间步里加小噪声,反向去噪过程则在每一个时间步上通过网络学习噪声分布去掉噪声。通过一长串的公式推导,其最终的损失函数相当的简单,就是个mse。看起来就像是很多个VAE叠加在一起。DDPM的一个缺点就是采样步长很长,通常需要1000步以上;而之后提出的DDIM模型将这个采样步长缩小到了50步左右,而这个效果是通过牺牲生成样本多样性实现的。DDIM模型通过一个叫做飘逸扩散方程的模型(这个模型在行为决策等研究中常常被采纳)来解释其原理。原本的DDPM模型其实只有漂移扩散方程中的扩散部分,而DDIM模型则加上了漂移的部分,可以将模型往数据采样密度较高的地方去靠近。
arXiv,
2020.
DOI: 10.48550/arXiv.2006.11239
Abstract:
We present high quality image synthesis results using diffusion probabilistic models, a class of latent variable models inspired by considerations from nonequilibrium thermodynamics. Our best results are obtained by training …
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We present high quality image synthesis results using diffusion probabilistic models, a class of latent variable models inspired by considerations from nonequilibrium thermodynamics. Our best results are obtained by training on a weighted variational bound designed according to a novel connection between diffusion probabilistic models and denoising score matching with Langevin dynamics, and our models naturally admit a progressive lossy decompression scheme that can be interpreted as a generalization of autoregressive decoding. On the unconditional CIFAR10 dataset, we obtain an Inception score of 9.46 and a state-of-the-art FID score of 3.17. On 256x256 LSUN, we obtain sample quality similar to ProgressiveGAN. Our implementation is available at this https URL
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557.
林海onrush
(2023-06-30 23:49):
#paper,doi:10.1017/fms.2015.2,A THEORY OF COMPLEXITY,CONDITION,AND ROUNDOFF,计算复杂性理论作为评判算法的重要标准,研究各种复杂性类的范围问题具有数学和工程意义,作者开发了一个理论的复杂性数值计算,考虑到输入数据的条件,并允许舍入的计算。Shub和Smale在R上的计算 (这又遵循了由Cook、Karp和Levin等人提出的经典、离散、复杂性理论)。特别专注于决策问题的复杂性类,不同版本的P,NP和EXP的多项式和非确定性多项式。及指数时间。作者证明了这些复杂性类之间的一些基本关系,并提供自然NP完全问题。
Forum of Mathematics, Sigma,
2015.
DOI: 10.1017/fms.2015.2
Abstract:
We develop a theory of complexity for numerical computations that takes into account the condition of the input data and allows for roundoff in the computations. We follow the lines …
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We develop a theory of complexity for numerical computations that takes into account the condition of the input data and allows for roundoff in the computations. We follow the lines of the theory developed by Blum, Shub and Smale for computations over $\mathbb{R}$ (which in turn followed those of the classical, discrete, complexity theory as laid down by Cook, Karp, and Levin, among others). In particular, we focus on complexity classes of decision problems and, paramount among them, on appropriate versions of the classes $\mathsf{P}$, $\mathsf{NP}$, and $\mathsf{EXP}$ of polynomial, nondeterministic polynomial, and exponential time, respectively. We prove some basic relationships between these complexity classes, and provide natural NP-complete problems.
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558.
小W
(2023-06-30 23:48):
#paper doi:https://doi.org/10.1016/j.cmet.2023.05.008 Ketogenic diet promotes tumor ferroptosis but induces relative corticosterone deficiency that accelerates cachexia 一项关于生酮饮食(KD)饿死肿瘤的研究。之前的研究(2022)指出生酮饮食的代谢产物β-羟丁酸(BHB,脂肪酸代谢后产生的酮体)可通过与细胞表面受体Hcar2结合,诱导转录调节因子Hopx表达增加,从而抑制肿瘤细胞增殖。本文则发现在产生IL-6相关(肝脏生酮损伤)的癌症小鼠模型,生酮饮食的抗癌作用与存活率(OS)不符合。生酮饮食延缓小鼠的肿瘤生长,但加速恶病质的进展,导致总体生存期缩短。作者通过代谢组学和转录组学数据,证明在肿瘤中,KD不仅通过营养剥夺,同时脂质过氧化增加,导致癌细胞的铁死亡。在宿主系统中KD增加了脂质氢过氧化物(looh)的产生,使GSH通路饱和,消耗NADPH储存,同时导致LPPs的积累,导致应激引起的食欲抑制因子GDF-15的升高。NADPH辅助因子的不足,导致下丘脑-垂体-肾上腺(HPA)轴缺陷,诱导相对低皮质酮血症,导致应激反应缺陷和癌症恶病质的早期发作。地塞米松(皮质类固醇)给药,降低了正常饮食喂养小鼠的PFS和OS,延长了KD喂养小鼠的PFS和OS。IL-6相关癌症小鼠OS:KD / 正常 + 地塞米松 < 正常 < KD + 地塞米松。IL-6相关癌症小鼠PFS:正常 + 地塞米松 < 正常 < KD / KD + 地塞米松。
Abstract:
Glucose dependency of cancer cells can be targeted with a high-fat, low-carbohydrate ketogenic diet (KD). However, in IL-6-producing cancers, suppression of the hepatic ketogenic potential hinders the utilization of KD …
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Glucose dependency of cancer cells can be targeted with a high-fat, low-carbohydrate ketogenic diet (KD). However, in IL-6-producing cancers, suppression of the hepatic ketogenic potential hinders the utilization of KD as energy for the organism. In IL-6-associated murine models of cancer cachexia, we describe delayed tumor growth but accelerated cachexia onset and shortened survival in mice fed KD. Mechanistically, this uncoupling is a consequence of the biochemical interaction of two NADPH-dependent pathways. Within the tumor, increased lipid peroxidation and, consequently, saturation of the glutathione (GSH) system lead to the ferroptotic death of cancer cells. Systemically, redox imbalance and NADPH depletion impair corticosterone biosynthesis. Administration of dexamethasone, a potent glucocorticoid, increases food intake, normalizes glucose levels and utilization of nutritional substrates, delays cachexia onset, and extends the survival of tumor-bearing mice fed KD while preserving reduced tumor growth. Our study emphasizes the need to investigate the effects of systemic interventions on both the tumor and the host to accurately assess therapeutic potential. These findings may be relevant to clinical research efforts that investigate nutritional interventions such as KD in patients with cancer.
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559.
小擎子
(2023-06-30 23:20):
#paper doi:10.1126/science.aba6527 Science, 2020, Designed protein logic to target cells with precise combinations of surface antigens 设计蛋白质逻辑,以靶向具有表面抗原精确组合的细胞。文献从头设计了协同定位依赖性蛋白质开关(Co-LOCKR),可执行“AND”、“OR”和“NOT”布尔逻辑运算。只有当满足所有条件时,这些开关才会通过构象变化激活,实现在复杂细胞群中以单细胞分辨率产生快速的、转录依赖的反应。使用“AND”门来重定向T细胞对表达两种表面抗原的肿瘤细胞的特异性,同时避免对单抗原细胞的脱靶识别,以及添加“NOT”或“OR”以避免或包括表达第三抗原的细胞。文章涉及蛋白质设计知识太多了,有点看不懂,但是这个设计是很有想象力很有意思的,可以实现只在特定细胞的细胞膜附近反应的效果。蛋白质设计的门槛现在降得很低,但就像David Baker说的,关键是你想设计什么样的蛋白。
Abstract:
Precise cell targeting is challenging because most mammalian cell types lack a single surface marker that distinguishes them from other cells. A solution would be to target cells using specific …
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Precise cell targeting is challenging because most mammalian cell types lack a single surface marker that distinguishes them from other cells. A solution would be to target cells using specific combinations of proteins present on their surfaces. In this study, we design colocalization-dependent protein switches (Co-LOCKR) that perform AND, OR, and NOT Boolean logic operations. These switches activate through a conformational change only when all conditions are met, generating rapid, transcription-independent responses at single-cell resolution within complex cell populations. We implement AND gates to redirect T cell specificity against tumor cells expressing two surface antigens while avoiding off-target recognition of single-antigen cells, and three-input switches that add NOT or OR logic to avoid or include cells expressing a third antigen. Thus, de novo designed proteins can perform computations on the surface of cells, integrating multiple distinct binding interactions into a single output.
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560.
张贝
(2023-06-30 23:14):
#paper DNA methylation-based classification of central nervous system tumours Nature. 2018 Mar 22;555(7697):469-474.doi:10.1038/nature26000
肿瘤的正确诊断对于后期治疗至关重要,然而在已知的近100多种中枢神经系统肿瘤 (central nervous system tumor,CNS tumor)中,相关标准化的诊断面临很大的挑战。为了高效、迅速的对CNS肿瘤进行分类,作者开发了一个机器学习模型,它可以对甲基化数据进行分类。开发出来的程序经过训练后,可以使用甲基化特征鉴定91种CNS肿瘤。训练集采用的参照数据来自约2800名癌症患者。作者在1104例已经经过人工检查的中枢神经系统肿瘤上进行了测试,发现有12%例存在误诊。该模型不仅可以提高诊断准确率,而且还可以鉴定出新型罕见肿瘤。为了让这种新方法得到广泛应用,作者生成了一款免费在线工具 (Molecular Neuropathology 2.0; http://www.kitz-heidelberg.de/molecular-diagnostics),可以在几分钟内分析上传的数据。自2016年12月上线以来,该工具已被使用逾4500次,用户可以选择分享他们的数据,以便进一步优化算法。作者总结表示,将甲基化特征与脑肿瘤自动分类器整合起来还可以为创造类似的肿瘤分类算法用于诊断其它癌症类型提供一个蓝图。
Abstract:
Accurate pathological diagnosis is crucial for optimal management of patients with cancer. For the approximately 100 known tumour types of the central nervous system, standardization of the diagnostic process has …
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Accurate pathological diagnosis is crucial for optimal management of patients with cancer. For the approximately 100 known tumour types of the central nervous system, standardization of the diagnostic process has been shown to be particularly challenging-with substantial inter-observer variability in the histopathological diagnosis of many tumour types. Here we present a comprehensive approach for the DNA methylation-based classification of central nervous system tumours across all entities and age groups, and demonstrate its application in a routine diagnostic setting. We show that the availability of this method may have a substantial impact on diagnostic precision compared to standard methods, resulting in a change of diagnosis in up to 12% of prospective cases. For broader accessibility, we have designed a free online classifier tool, the use of which does not require any additional onsite data processing. Our results provide a blueprint for the generation of machine-learning-based tumour classifiers across other cancer entities, with the potential to fundamentally transform tumour pathology.
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