参考文献

Psychological stress causes gut microbial dysbiosis and cancer progression,yet how gut microbiota determines psychological stress-induced tumor development remains unclear. Here we showed that psychological stress promotes breast tumor growth and cancer stemness,an outcome that depends on gut microbiota in germ-free and antibiotic-treated mice. Metagenomic and metabolomic analyses revealed that psychological stress markedly alters the composition and abundance of gut microbiota,especially Akkermansia muciniphila ( A. muciniphila ),and decreases short-chain fatty acid butyrate. Supplement of active A. muciniphila,butyrate or a butyrate-producing high fiber diet dramatically reversed the oncogenic property and anxiety-like behavior of psychological stress in a murine spontaneous tumor model or an orthotopic tumor model. Mechanistically,RNA sequencing analysis screened out that butyrate decreases LRP5 expression to block the activation of Wnt/β-catenin signaling pathway,dampening breast cancer stemness. Moreover,butyrate as a HDAC inhibitor elevated histone H3K9 acetylation level to transcriptionally activate ZFP36,which further accelerates LRP5 mRNA decay by binding adenine uridine-rich (AU-rich) elements of LRP5 transcript. Clinically,fecal A. muciniphila and serum butyrate were inversely correlated with tumoral LRP5/β-catenin expression,poor prognosis and negative mood in breast cancer patients. Altogether,our findings uncover a microbiota-dependent mechanism of psychological stress-triggered cancer stemness,and provide both clinical biomarkers and potential therapeutic avenues for cancer patients undergoing psychological stress. Subject terms: Cancer metabolism,Cancer stem cells View Publication

Lung transplantation is the primary treatment for end-stage lung diseases. However,ischemia-reperfusion injury (IRI) significantly impacts transplant outcomes. 4-Octyl itaconate (4-OI) has shown potential in mitigating organ IRI,although its effects in lung transplantation require further exploration. BEAS-2B cells were used to model transplantation,assessing the effects of 4-OI through viability,apoptosis,and ROS assays. qRT-PCR analyzed cytokine transcription post-cold ischemia/reperfusion (CI/R). RNA sequencing and Gene Ontology analysis elucidated 4-OI’s mechanisms of action,confirmed by Western blotting. ALI-airway and lung transplantation organoid models evaluated improvements in bronchial epithelial morphology and function due to 4-OI. ELISA measured IL-6 and IL-8 levels. Rat models of extended cold preservation and non-heart-beating transplantation assessed 4-OI’s impact on lung function,injury,and inflammation. Our findings indicate that 4-OI (100 µM) during cold preservation effectively maintained cell viability,decreased apoptosis,and reduced ROS production in BEAS-2B cells under CI/R conditions. It also downregulated pro-inflammatory cytokine transcription,including IL1B,IL6,and TNF. Inhibition of Nrf2 partially reversed these protective effects. In cold preservation solutions,4-OI upregulated Nrf2 target genes such as NQO1,HMOX1,and SLC7A11. In ALI airway models,4-OI enhanced bronchial epithelial barrier integrity and ciliary beat function after CI/R. In rat models,4-OI administration improved lung function and reduced pulmonary edema,tissue injury,apoptosis,and systemic inflammation following extended cold preservation or non-heart-beating lung transplantation. Incorporating 4-OI into cold preservation solutions appears promising for alleviating CI/R-induced bronchial epithelial injury and enhancing lung transplant outcomes via Nrf2 pathway activation. The online version contains supplementary material available at 10.1186/s12931-025-03151-7. View Publication

Small nucleolar RNAs (snoRNAs) are non-coding RNAs that function in ribosome and spliceosome biogenesis,primarily by guiding modifying enzymes to specific sites on ribosomal RNA (rRNA) and spliceosomal RNA (snRNA). However,many orphan snoRNAs remain uncharacterized,with unidentified or unvalidated targets,and studies on additional snoRNA-associated proteins are limited. We adapted an enhanced chimeric eCLIP approach to comprehensively profile snoRNA-target RNA interactions using both core and accessory snoRNA-binding proteins as baits. Using core snoRNA-binding proteins,we confirmed most annotated snoRNA-rRNA and snoRNA-snRNA interactions in mouse and human cell lines and called novel,high-confidence interactions for orphan snoRNAs. While some of these interactions result in chemical modification,others may have modification-independent functions. We showed that snoRNA ribonucleoprotein complexes containing certain accessory proteins,like WDR43 and NOLC1,enriched for specific subsets of snoRNA-target RNA interactions with distinct roles in ribosome and spliceosome biogenesis. Notably,we discovered that SNORD89 guides 2′-O-methylation at two neighboring sites in U2 snRNA that fine-tune splice site recognition. Chimeric eCLIP of snoRNA-associating proteins enables a comprehensive framework for studying snoRNA-target interactions in an RNA-binding protein-dependent manner,revealing novel interactions and regulatory roles in RNA biogenesis. The online version contains supplementary material available at 10.1186/s13059-025-03508-7. View Publication

Induced pluripotent stem cell (iPSC)-derived mesenchymal stem cells (iMSCs) have greater potential for generating chondrocytes without hypertrophic and fibrotic phenotypes compared to bone marrow-derived mesenchymal stem/stromal cells (BMSCs). However,there is a lack of research demonstrating the use of autologous iMSCs for repairing articular chondral lesions in large animal models. In this study,we aimed to evaluate the effectiveness of autologous miniature pig (minipig) iMSC-chondrocyte (iMSC-Ch)-laden implants in comparison to autologous BMSC-chondrocyte (BMSC-Ch)-laden implants for cartilage repair in porcine femoral condyles. iMSCs and BMSCs were seeded into fibrin glue/nanofiber constructs and cultured with chondrogenic induction media for 7 days before implantation. To assess the regenerative capacity of the cells,19 skeletally mature Yucatan minipigs were randomly divided into microfracture control,acellular scaffold,iMSC,and BMSC subgroups. A cylindrical defect measuring 7 mm in diameter and 0.6 mm in depth was created on the articular cartilage surface without violating the subchondral bone. The defects were then left untreated or treated with acellular or cellular implants. Both cellular implant-treated groups exhibited enhanced joint repair compared to the microfracture and acellular control groups. Immunofluorescence analysis yielded significant findings,showing that cartilage treated with iMSC-Ch implants exhibited higher expression of COL2A1 and minimal to no expression of COL1A1 and COL10A1,in contrast to the BMSC-Ch-treated group. This indicates that the iMSC-Ch implants generated more hyaline cartilage-like tissue compared to the BMSC-Ch implants. Our findings contribute to filling the knowledge gap regarding the use of autologous iPSC derivatives for cartilage repair in a translational animal model. Moreover,these results highlight their potential as a safe and effective therapeutic strategy. The online version contains supplementary material available at 10.1186/s13287-025-04215-7. View Publication

Persistence of drug-resistant breast cancer stem cells (brCSCs) after a chemotherapeutic regime correlates with disease recurrence and elevated mortality. Therefore,deciphering mechanisms that dictate their drug-resistant phenotype is imperative for designing targeted and more effective therapeutic strategies. The transcription factor SOX2 has been recognized as a protagonist in brCSC maintenance,and previous studies have confirmed that inhibition of SOX2 purportedly eliminated these brCSCs. However,pharmacological targeting of transcription factors like SOX2 is challenging due to their structural incongruities and intrinsic disorders in their binding interfaces. Therefore,transcriptional co-activators may serve as a feasible alternative for effectively targeting the brCSCs. Incidentally,transcriptional co-activators YAP/TAZ were found to be upregulated in CD44 + /CD24 - /ALDH + cells isolated from patient breast tumors and CSC-enriched mammospheres. Interestingly,it was observed that YAP/TAZ exhibited direct physical interaction with SOX2 and silencing YAP/TAZ attenuated SOX2 expression in mammospheres,leading to significantly reduced sphere forming efficiency and cell viability. YAP/TAZ additionally manipulated redox homeostasis and regulated mitochondrial dynamics by restraining the expression of the mitochondrial fission marker,DRP1. Furthermore,YAP/TAZ inhibition induced DRP1 expression and impaired OXPHOS,consequently inducing apoptosis in mammospheres. In order to enhance clinical relevance of the study,an FDA-approved drug verteporfin (VP),was used for pharmacological inhibition of YAP/TAZ. Surprisingly,VP administration was found to reduce tumor-initiating capacity of the mammospheres,concomitant with disrupted mitochondrial homeostasis and significantly reduced brCSC population. Therefore,VP holds immense potential for repurposing and decisively eliminating the chemoresistant brCSCs,offering a potent strategy for managing tumor recurrence effectively. Subject terms: Cancer stem cells,Cancer stem cells View Publication

Telomeres are terminal protective chromosome structures. Genetic variants in genes coding for proteins required for telomere maintenance cause rare,life-threatening Telomere Biology Disorders (TBDs) such as dyskeratosis congenita,aplastic anemia or pulmonary fibrosis. The more frequently used mice strains have telomeres much longer than the human ones which question their use as in vivo models for TBDs. One mice model with shorter telomeres based on the CAST/EiJ mouse strain carrying a mutation in the Terc gene,coding for the telomerase RNA component,has been studied in comparison with C57BL/6J mice,carrying the same mutation and long telomeres. The possible alterations produced in lungs and the haematopoietic system,frequently affected in TBD patients,were determined at different ages of the mice. Homozygous mutant mice presented a very shortened life span,more notorious in the short-telomeres CAST/EiJ strain. The lungs of mutant mice presented a transitory increase in fibrosis and a significant decrease in the relative amount of the alveolar epithelial type 2 cells from six months of age. This decrease was larger in mutant homozygous animals but was also observed in heterozygous animals. On the contrary the expression of the senescence-related protein P21 increased from six months of age in mutant mice of both strains. The analysis of the haematopoietic system indicated a decrease in the number of megakaryocyte-erythroid progenitors in homozygous mutants and an increase in the clonogenic potential of bone marrow and LSK cells. Bone marrow cells from homozygous mutant animals presented decreasing in vitro expansion capacity. The alterations observed are compatible with precocious ageing of lung alveolar cells and the bone marrow cells that correlate with the alterations observed in TBD patients. The alterations seem to be more related to the genotype of the animals that to the basal telomere length of the strains although they are more pronounced in the short-telomere CAST/EiJ-derived strain than in C57BL/6J animals. Therefore,both animal models,at ages over 6–8 months,could represent valuable and convenient models for the study of TBDs and for the assay of new therapeutic products. View Publication

Understanding the interaction between genetic and epigenetic variation remains a challenge due to confounding environmental factors. We propose that human induced Pluripotent Stem Cells (iPSCs) are an excellent model to study the relationship between genetic and epigenetic variation while controlling for environmental factors. In this study,we have created a comprehensive resource of high-quality genomic,epigenomic,and transcriptomic data from iPSC lines and three iPSC-derived cell types (neural stem cell (NSC),motor neuron,monocyte) from three healthy donors. We find that epigenetic variation is most strongly associated with genetic variation at the iPSC stage,and that relationship weakens as epigenetic variation increases in differentiated cells. Additionally,cell type is a stronger source of epigenetic variation than genetic variation. Further,we elucidate a utility of studying epigenetic variation in iPSCs and their derivatives for identifying important loci for GWAS studies and the cell types in which they may be acting. Subject terms: Epigenomics,Genomics,Transcriptomics View Publication

Respiratory viruses pose an ongoing threat to human health with excessive cytokine secretion contributing to severe illness and mortality. However,the relationship between cytokine secretion and viral infection remains poorly understood. Here we elucidate the role of CXCL8 as an early response gene to EV-D68 infection. Silencing CXCL8 or its receptors,CXCR1/2,impedes EV-D68 replication in vitro. Upon recognition of CXCL8 by CXCR1/2,the MAPK pathway is activated,facilitating the translocation of nuclear hnRNP-K to the cytoplasm. This translocation increases the recognition of viral RNA by hnRNP-K in the cytoplasm,promoting the function of the 5′ untranslated region in the viral genome. Moreover,our investigations also reveal the importance of the CXCL8 signaling pathway in the replication of both influenza virus and rhinovirus. In summary,our findings hint that these viruses exploit the CXCL8/MAPK/hnRNP-K axis to enhance viral replication in respiratory cells in vitro. Subject terms: Virus-host interactions,Chemokines,Antimicrobial responses,Viral host response View Publication

In contrast to mammals,adult zebrafish achieve complete heart regeneration via proliferation of cardiomyocytes. Surprisingly,we found that regenerating cardiomyocytes experience DNA replication stress,which represents one reason for declining tissue regeneration during aging in mammals. Pharmacological inhibition of ATM and ATR kinases revealed that DNA damage response signaling is essential for zebrafish heart regeneration. Manipulation of Bone Morphogenetic Protein (BMP)-Smad signaling using transgenics and mutants showed that BMP signaling alleviates cardiomyocyte replication stress. BMP signaling also rescues neonatal mouse cardiomyocytes,human fibroblasts and human hematopoietic stem and progenitor cells (HSPCs) from replication stress. DNA fiber spreading assays indicate that BMP signaling facilitates re-start of replication forks after replication stress-induced stalling. Our results identify the ability to overcome replication stress as key factor for the elevated zebrafish heart regeneration capacity and reveal a conserved role for BMP signaling in promotion of stress-free DNA replication. Subject terms: Cardiac regeneration,DNA damage and repair,Ageing View Publication

Animal models of the neuromuscular junction (NMJ) have been widely studied but exhibit critical differences from human biology limiting utility in drug and disease modelling. Challenges with scarcity,scalability,throughput,and ethical considerations further limit the suitability of animal models for preclinical screening. Engineered models have emerged as alternatives for studying NMJ functionality in response to genetic and/or pharmacological challenge. However,these models have faced challenges associated with their poorly scalable creation,sourcing suitable cells,and the extraction of reliable,quantifiable metrics. We present a turnkey iPSC-based model of the NMJ employing channelrhodopsin-2 expression within the motor neuron (MN) population driving muscle contraction in response to blue light. MNs co-cultured with engineered skeletal muscle tissues produced twitch forces of 34.7 ± 22.7 µN in response to blue light,with a response fidelity > 92 %. Histological analysis revealed characteristic punctate acetylcholine receptor staining co-localized with the presynaptic marker synaptic vesicle protein-2. Dose-response studies using botulinum neurotoxin showed loss of function in a dose- and time-dependent manner (EC50 - 0.11 ± 0.015 µg). Variability of the EC50 values between 2 different iPSC differentiations of both cell types and 2 users was less than 2 %. Further testing with the acute neurotoxins acetylcholine mustard and d-tubocurarine validated the biological relevance of the postsynaptic machinery of the model. This model marks a meaningful progression of 3D engineered models of the NMJ,providing engineered tissues at a throughput relevant to potency and screening applications with an abundant iPSC cell source and standardized hardware-software ecosystem allowing technology transfer across laboratories. View Publication