Core Findings - An international study has identified a key protein (SIRT6) that regulates tryptophan metabolism, significantly impacting sleep, mood, and neurodegenerative diseases, providing new research directions for treatment [1][2] Group 1: Tryptophan Metabolism - Tryptophan is a precursor for serotonin and melatonin synthesis, with serotonin playing a crucial role in mood regulation and melatonin maintaining circadian rhythms and promoting sleep [1] - The study found that aging and neurodegenerative diseases can disrupt tryptophan metabolism, although the underlying molecular mechanisms were previously unclear [1] Group 2: SIRT6's Role - Researchers discovered that SIRT6 acts as a "gatekeeper" in maintaining the balance of tryptophan metabolism by actively regulating the expression of related genes [1] - A decline in SIRT6 activity due to aging and neurodegenerative diseases leads to a shift in tryptophan metabolism towards the kynurenine pathway, resulting in decreased serotonin and melatonin production and increased neurotoxins [1] Group 3: Reversibility of Damage - The damage caused by the accumulation of neurotoxic metabolites is not irreversible; in SIRT6-deficient fruit fly models, researchers successfully reversed the accumulation by altering SIRT6-regulated genes, protecting brain tissue and improving motor behavior [2] - This research offers new targets for treating age-related cognitive impairments, insomnia, and depression [2] Group 4: Publication - The research findings have been published in the journal Nature Communications [3]

Core Viewpoint - The research highlights the role of tumor-produced ammonia in enhancing regulatory T cells (Treg cells), which impedes anti-tumor immunity, suggesting ammonia generation as a potential target for cancer immunotherapy [2][5]. Group 1: Research Findings - The study published in Cell reveals that ammonia produced by tumors is metabolized by Treg cells, leading to their enhancement and further obstruction of anti-tumor immune responses [2][5]. - The research team identified metabolic heterogeneity in human hepatocellular carcinoma (HCC), characterized by high levels of glutamine breakdown and ammonia, where Treg cells are prevalent while CD8+ and CD4+ effector T cells are diminished [3]. - Treg cells utilize the urea cycle to detoxify ammonia by upregulating argininosuccinate lyase (ASL), and ammonia is converted into spermidine under the regulation of the FOXP3 transcription factor [3][8]. Group 2: Clinical Implications - The study indicates that tumor cells undergoing anti-PD-1 treatment release ammonia through deamination, which enhances Treg cell function and leads to resistance to immunotherapy [4][8]. - The findings suggest that targeting ammonia production could inhibit Treg cells, providing a novel strategy for enhancing anti-tumor immunity [5][8].

Core Viewpoint - The research highlights the importance of the interaction between the embryo and the endometrium during the early stages of pregnancy, revealing that the endometrium actively regulates the implantation process rather than being a passive recipient [2][5]. Group 1: Research Findings - A 3D co-culture system was developed to allow human embryos to interact with endometrial tissue, significantly improving embryo survival rates and providing insights into early pregnancy mechanisms [2][5]. - The study found that trophoblast cells began to invade the endometrial organoid by day 7, and key developmental milestones were observed that were not seen in previous culture systems without maternal tissue [5][8]. - The endometrium was shown to initiate the invasion program of extravillous trophoblasts (EVT) three days earlier than previously recorded, indicating a proactive role in the implantation process [8]. Group 2: Molecular Mechanisms - The research identified that EVT cells, crucial for placental invasion, appeared significantly earlier in the co-culture system, with molecular signals activating key invasion genes [8][9]. - The study demonstrated that human chorionic gonadotropin (hCG) is essential for successful implantation, with blocking its function leading to a drastic decrease in embryo adhesion and development [9][10]. - The embryo was observed to exchange materials with the mother through vesicle transport, mimicking in vivo dynamics within the co-culture environment [10].

撰文丨王聪 编辑丨王多鱼 排版丨水成文 慢性肾病 （ Chronic Kidney Disease ） 影响着全球十分之一的人口，其中被称为 足细胞 （ Podocyte ） 的肾脏特殊滤血细胞的损伤，发挥着关键作用。在肾 病综合征的主要病因—— 膜性肾病 （ membranous nephropathy，MN ） 中，循环 自身抗体 会攻击足细胞足突上的蛋白质，从而损害肾脏的过滤屏障 ， 导致 大量蛋白质从血液泄漏到尿液中 （即 蛋白尿 ） 。 近日，德国 汉堡-埃彭多夫大学医学中心的研究人员在国际顶尖学术期刊 Cell 上发表了题为： Autoantibody-triggered podocyte membrane budding drives autoimmune kidney disease 的研究论文。 我们研究发现， 自身免疫球蛋白触发的细胞外囊泡 （AIT-EV） 的形成是足细胞质膜出芽的重要病理学特征，这一过程由足细胞试图清除与足突跨膜抗原结合的 致病性自身抗体所引发，为 膜性肾 病 （MN） 中异质性的肾小球蛋白质聚集提供了一个统一而保守的机制。此外，该研究还表明，尿液 AIT-EV 分析可 ...

Core Insights - The article discusses the significant impact of rotavirus infections on neonates, particularly highlighting the severe symptoms and systemic infections that can arise, which are not effectively prevented by existing vaccines [2][5] - A recent study reveals that dysregulation of the hepcidin-iron axis plays a critical role in impairing antiviral immunity and causing liver damage in neonates infected with rotavirus, providing new therapeutic targets for related diseases such as biliary atresia [3][11] Summary by Sections Rotavirus and Its Impact - Rotavirus is a major cause of life-threatening gastroenteritis in children under five, leading to severe symptoms in neonates, including blood in stool and unstable vital signs, with current vaccination strategies offering no protection [2][5] - The prevalence of biliary atresia (BA) is noted, affecting 1 in every 5,000 to 18,000 newborns, with its etiology linked to infections, immune dysregulation, and genetic susceptibility [5] Research Findings - The study published in the journal Immunity identifies iron metabolism dysregulation as a key mechanism in rotavirus-related systemic infections in neonates, suggesting new treatment avenues [3][11] - Single-cell RNA sequencing revealed that iron dysregulation is a driving factor for liver damage in rotavirus infections, with elevated hepcidin levels inhibiting iron export and leading to cellular damage [6][9] Clinical Implications - An open-label clinical trial demonstrated that preoperative folic acid supplementation significantly reduced the incidence of cholangitis from 74% to 21% and liver transplantation rates from 41.1% to 11.1% in biliary atresia patients [8] - The study emphasizes the importance of targeting the hepcidin-iron signaling pathway to mitigate liver damage and improve outcomes in neonates with rotavirus infections [9][11]

Core Insights - Lung cancer is the most common malignant tumor globally and the leading cause of cancer-related deaths, with non-small cell lung cancer (NSCLC) accounting for over 85% of cases. Despite advancements in clinical management, the 5-year overall survival rate for NSCLC patients has only increased from 15% to 25% [2] - Immune checkpoint inhibitors (ICIs), such as PD-1 and PD-L1 inhibitors, have transformed the treatment landscape for NSCLC. However, the objective response rate (ORR) for unselected NSCLC patients receiving ICI treatment is only 10%-30%, with some patients experiencing accelerated disease progression or early death [2] - A new study identified a circRNA signature (circRNA-Sig) consisting of 11 circRNAs that can predict the response to immunotherapy in advanced NSCLC, potentially guiding clinical treatment [3][8] Summary by Sections CircRNA and Cancer - CircRNA is associated with dysregulated RNA expression in cancer and has potential as a biomarker for predicting responses to ICIs [3] Research Findings - The research team analyzed circRNA expression profiles from 891 advanced NSCLC patients in the OAK and POPLAR clinical trials, identifying significantly differentially expressed circRNAs [4] - A predictive model was constructed using machine learning, which was validated and revealed key circRNAs that may influence the efficacy of NSCLC immunotherapy [4] CircRNA-Sig Model - The circRNA-Sig model demonstrated an area under the curve (AUC) of 0.71 in the OAK trial and 0.67 in the POPLAR trial for predicting the efficacy of atezolizumab [5] - Survival analysis indicated that patients with low circRNA-Sig scores benefited significantly more from ICI treatment compared to chemotherapy (HR=1.347), while high-score patients showed no significant difference [5] - Enrichment analysis suggested that low-score patients exhibited an activated tumor immune microenvironment, indicating a mechanistic link between circRNA and ICI treatment sensitivity [5] Clinical Application - The circRNA-Sig model, validated across two large clinical trial cohorts, offers a new stratification tool for NSCLC patients undergoing atezolizumab treatment, enhancing personalized treatment strategies [8]

新华社赫尔辛基12月4日电（记者朱昊晨 徐谦）斯德哥尔摩消息：瑞典卡罗琳医学院参与的一项国际研 究发现，大脑中两种受体可调控与阿尔茨海默病密切相关的贝塔淀粉样蛋白的分解过程。 ...

Core Viewpoint - Obesity is identified as a chronic metabolic disease characterized by excessive fat accumulation and is a major global public health concern, with nearly 50% of the adult population estimated to be overweight, leading to various non-communicable diseases [2] Group 1: Chronic Inflammation and Obesity - Chronic inflammation in adipose tissue is a key link between obesity and several chronic diseases, including type 2 diabetes, non-alcoholic fatty liver disease, and cardiovascular diseases [7] - The interaction between adipocytes and resident immune cells in adipose tissue plays a crucial regulatory role in this pathological process, although the underlying mechanisms remain largely unclear [7] Group 2: Research Findings - A recent study published in Signal Transduction and Targeted Therapy reveals that hypertrophic adipocytes mediate inflammation through a β2-microglobulin (B2M)-dependent mechanism, activating resident CD8+ T cells and macrophages in adipose tissue [4][5] - The study emphasizes the potential of targeting B2M in adipocytes as a therapeutic strategy for obesity-related chronic inflammation and metabolic disorders [5] Group 3: Mechanisms of Action - The research indicates that during obesity, the expression of B2M in hypertrophic adipocytes is upregulated, which not only activates CD8+ T cells but also promotes iron overload and ferroptosis in adipocytes, leading to M1 polarization of macrophages [7] - Specific knockout of B2M in adipocytes effectively inhibits the activation and accumulation of CD8+ T cells, as well as iron-induced cell death and M1 polarization, preventing obesity and related inflammation and metabolic disorders induced by a high-fat diet [7] Group 4: Correlation with Human Data - Bioinformatics analysis of human adipose tissue transcriptome data shows a strong correlation between B2M levels and obesity, with significantly elevated B2M expression found in adipocytes isolated from obese patients [9] - Overall, the findings highlight the critical role of adipocytes in obesity-related chronic inflammation and metabolic disorders through a B2M-dependent mechanism [9]

Core Viewpoint - The study reveals a signaling axis involving visceral adipose tissue-derived extracellular vesicles (VAT-EV) that promotes pancreatic cancer development and resistance to immune checkpoint blockade therapy in obese patients, suggesting potential new therapeutic strategies for obesity-related cancers [4][7]. Group 1: Research Findings - The research identifies that VAT-EV from obese patients facilitates communication with pancreatic ductal adenocarcinoma (PDAC) tissues [4]. - PDAC cells can internalize VAT-EV, leading to the stabilization of ribonuclease Rnaset2b and the production of free pseudouridine [4][5]. - Pseudouridine activates mast cells by increasing reactive oxygen species (ROS) and reducing H3K27me3 modifications, creating an immunosuppressive tumor microenvironment that promotes cancer progression [4][5]. Group 2: Implications for Therapy - Targeting the VAT-EV-CTSA-pseudouridine-mast cell signaling pathway could enhance the efficacy of immune checkpoint blockade therapy for PDAC [5][7]. - The study provides hope for developing new treatment strategies for obesity-related cancers by elucidating the molecular mechanisms linking obesity and cancer [7].

Core Viewpoint - The recent research from the University of California, Berkeley, challenges the traditional belief that high-calorie foods are solely responsible for obesity, suggesting that the pleasure derived from eating can play a positive role in weight management [4][7]. Group 1: Research Findings - The study titled "Changes in neurotensin signalling drive hedonic devaluation in obesity" reveals that the enjoyment of food can help maintain energy balance, redefining the relationship between food pleasure and obesity [4][7]. - High-fat diets were shown to impair the brain's reward system, leading to reduced appetite for high-calorie foods in obese mice, despite weight gain [9][11]. - The research identified neurotensin (NTS) as a key player in this process, with high-fat diets significantly suppressing NTS expression, which is crucial for enhancing dopamine neuron activity during food enjoyment [11][12]. Group 2: Implications for Weight Management - Restoring NTS levels through dietary intervention or gene therapy resulted in obese mice regaining normal food responses, reducing overall food intake, and improving anxiety symptoms [12]. - The findings suggest a shift from traditional weight loss strategies focused on appetite suppression to approaches that enhance the brain's reward mechanisms related to food enjoyment, potentially leading to the development of "happy dieting" therapies [12]. - This research opens new avenues for addressing obesity and related metabolic disorders, emphasizing the intersection of neuroscience and nutrition [12].