摘要：Traditional tumor models do not tend to accurately simulate tumor growth in vitro or enable personalized treatment and are particularly unable to discover more beneficial targeted *** address this,this study describes the use of threedimensional(3D)bioprinting technology to construct a 3D model with human hepatocarcinoma SMMC-7721 cells(3DP-7721)by combining gelatin methacrylate(GelMA)and poly(ethylene oxide)(PEO)as two immiscible aqueous phases to form a bioink and innovatively applying fluorescent carbon quantum dots for long-term tracking of *** GelMA(10%,mass fraction)and PEO(1.6%,mass fraction)hydrogel with 3:1 volume ratio offered distinct pore-forming characteristics,satisfactorymechanical properties,and biocompatibility for the creation of the 3DP-7721 *** analysis and quantitative real-time fluorescence polymerase chain reaction(PCR)were used to evaluate the biological properties of the *** with the two-dimensional culture cell model(2D-7721)and the 3D mixed culture cell model(3DM-7721),3DP-7721 significantly improved the proliferation of cells and expression of tumor-related proteins and ***,we evaluated the differences between the three culture models and the effectiveness of antitumor drugs in the three models and discovered that the efficacy of antitumor drugs varied because of significant differences in resistance proteins and genes between the three *** addition,the comparison of tumor formation in the three models found that the cells cultured by the 3DP-7721 model had strong tumorigenicity in nude *** evaluation of the levels of biochemical indicators related to the formation of solid tumors showed that the 3DP-7721 model group exhibited pathological characteristics of malignant tumors,the generated solid tumors were similar to actual tumors,and the deterioration was *** research therefore acts as a foundation for the application of 3DP-7721 models in drug devel

摘要：Bio-nanochannels in living organisms participate in the physiological activities by selectively transporting ions through cell *** structure and function of biological ion channels inspire the development of artificial ion nanochannels with practical *** bioinspired nanochannels based on polymer materials present good mechanical stability,high-performance ion transport and designability,which have attracted much *** this review,we mainly focus on the fabrication and application of polymer-based biomimetic nanochannels especially in environmentally responsive biosensor and energy *** firstly introduce the basic understanding of nanochannels in ion regulation and osmotic energy ***,we discuss the fabrication methods of polymer-based nanochannels and highlight their advantages compared with other *** practical applications of polymer-based biomimetic nanochannels,especially in energy conversion and environmentally responsive biosensor,are detailedly ***,we summarize the unsolved problems in bioinspired nanochannels and overview the further developing direction in this field.

摘要：清除衰老细胞是延缓衰老或治疗衰老相关疾病的一种有前途的方法.目前,达沙替尼和槲皮素的组合是研究最为广泛的衰老细胞裂解剂.然而,这两种药物的药代动力学和组织分布不同,迫切需要一种靶向递送策略使其能够同步到达组织或器官.本文设计了一种双药纳米递送系统(L-DQ),以达沙替尼和槲皮素纳米粒子(DQ)为核心,通过将纳米粒子与靶向蛋白相结合,使其具有靶向特定器官的能力.将DQ与溶菌酶结合得到能够靶向肾脏并清除肾脏衰老细胞的L-DQ.L-DQ能够特异性清除衰老细胞而不损害非衰老细胞,有效降低了受损肾脏的衰老细胞比例,促进了肾功能的恢复.这种双药纳米递送系统有助于靶向递送衰老细胞裂解剂至特定器官,为防治衰老相关疾病提供了一种潜在的策略.

摘要：The stiffness and nanotopographical characteristics of the extracellular matrix （ECM） influence numerous developmental, physiological, and pathological processes in vivo. These biophysical cues have therefore been applied to modulate almost all aspects of cell behavior, from cell adhesion and spreading to proliferation and differentiation. Delineation of the biophysical modulation of cell behavior is critical to the rational design of new biomaterials, implants, and medical devices. The effects of stiffness and topographical cues on cell behavior have previously been reviewed, respectively; however, the interwoven effects of stiffness and nanotopographical cues on cell behavior have not been well described, despite similarities in phenotypic manifestations. Herein, we first review the effects of substrate stiffness and nanotopography on cell behavior, and then focus on intracellular transmission of the biophysical signals from integrins to nucleus. Attempts are made to connect extracellular regulation of cell behavior with the biophysical cues. We then discuss the challenges in dissecting the biophysical regulation of cell behavior and in translating the mechanistic understanding of these cues to tissue engineering and regenerative medicine.

摘要：Tissue implant-related infections are among the most serious complications after surgical implantation,including orthopedics and *** with antibacterial ion release systems are efficient and economical antibiotic substitutes to fight against bacterial ***,the excessive amount of released antibacterial ions may cause biological toxicity while killing *** raises a fundamental issue on how to properly control the amounts of ions and their ***,we develop low-dose antibacterial ions-incorporated ferroelectric implants(copper-doped potassium sodium niobate,K0.5Na0.5NbO3-Cu,KNNCu)whose surface potential can be tuned via external *** released Cu2+ions can be targeted to bacteria via endogenous electric field(EEF)between KNNCu implants and negatively charged ***,the antibacterial efficacy of the implants is determined by the amount of Cu^2+ions that reaches bacteria,instead of the total amount of released Cu2+*** amount of Cu2+ions reaching bacteria from the high-surface-potential implant is 2.4 times that from the lowsurface-potential implant within 12 h,resulting in the increased antibacterial ratio from about 65%to 100%,while remaining low cell *** work provides insights into the specific role of the EEF in guiding mass transport between charged materials and living organisms,and a new perspective for the design of high-performance antibacterial biomaterials.

摘要：临床上常用的广谱抗生素无法有效解决抗生素高度耐药ESKAPE菌感染的难题,ESKAPE耐药菌已经成为人类生命健康的重大威胁.抗生素与佐剂的联合治疗是解决抗生素耐药菌感染的重要途径,但是探索对所有ESKAPE耐药菌都具有广谱和高效抗菌活性的抗生素-佐剂组合仍然面临巨大挑战.在这里,我们提出了一种抗生素-佐剂的有效设计策略,将对ESKAPE中耐药阴性菌具有高活性的多粘菌素B(PMB)与模拟宿主防御肽的细菌膜靶向阳离子聚(2-噁唑啉)相结合.我们通过2-噁唑啉单体可控聚合,合成了一系列具有不同疏水性侧链的阳离子聚(2-噁唑啉).研究表明,聚(2-噁唑啉)和PMB的组合效果随着聚(2-噁唑啉)侧链疏水性的提高呈现出从拮抗效应到协同效应的逐渐变化.其中,优选的聚(2-噁唑啉)EACA-POX_(20)显著增强了PMB的抗菌活性,尤其是对于ESKAPE耐药阳性菌的抗菌活性增强了16–32倍.聚(2-噁唑啉)EACA-POX_(20)有效增强了PMB的抗菌活性并扩展了PMB的抗菌谱.聚(2-噁唑啉)和PMB的组合策略能够有效对抗所有耐药ESKAPE病原体,为解决ESKAPE耐药菌提供了新的思路.

摘要：Although dielectric elastomer(DE)with substantial actuated strain(AS)has been reported 20 years ago,its scientific understanding remains *** most accepted theory of DE,which is proposed in 2000,holds the view that AS of DE is induced by the Maxwell *** to this theory,materials have similar ratios of permittivity and Young’s modulus should have similar AS,while the experimental results are on contrary to this theory,and the experimental AS has no relationship with ideal ***,a new dipole-conformation-actuated strain cross-scale model is proposed,which can be generally applied to explain the AS of DE without *** to this model,several characteristics of an ideal DE are listed in this work and a new DE based on polyphosphazene(PPZ)is *** AS of PPZ can reach 84%without any *** last,a PPZ-based all soft artificial heart(ASAH)is built,which works in the similar way with natural myocardium,indicating that this material has great application potential and possibility in the construction of an ASAH for heart failure(HF)patients.

摘要：Three-dimensional(3D)tumor models prepared from patient-derived cells have been reported to imitate some of the biological development processes of in situ tumors in *** 3D tumor models share several important characteristics with their in vivo tumor ***,their applications in tumor modeling,drug screening,and precision-targeted treatment are ***,the establishment of tumormodels is subject to several challenges,including advancements in scale size,repeatability,structural precision in time and space,vascularization,and the tumor ***,bioprinting technologies enabling the editorial arrangement of cells,factors,and materials have improved the simulation of tumormodels in *** the 3D bioprinted tumor models,the organoidmodel has been widely appreciated for its advantages of maintaining high heterogeneity and capacity for simulating the developmental process of tumor *** this review,we outline approaches and potential prospects for tumor model bioprinting and discuss the existing bioprinting technologies and bioinks in tumor model *** multidisciplinary combination of tumor pathology,molecular biology,material science,and additive manufacturing will help overcome the barriers to tumor model construction by allowing consideration of the structural and functional characteristics of in vitro models and promoting the development of heterogeneous tumor precision therapies.

摘要：激活环状GMP-AMP合成酶-干扰素基因刺激因子(cGAS-STING)通路可以有效启动抗肿瘤免疫,但如何特异性地激活STING通路仍是一个巨大的挑战.本文设计了一种铁死亡触发肿瘤细胞线粒体DNA释放,用于激活STING通路的肿瘤免疫治疗纳米平台(命名为HBMn-FA).一方面,HBMn-FA介导的铁死亡可以诱导肿瘤细胞中活性氧(ROS)水平急剧升高,引起线粒体氧化应激,释放内源性信号分子-线粒体DNA,并在Mn^(2+)的协同作用下特异性启动cGAS-STING通路.另一方面,HBMn-FA也可以造成肿瘤细胞死亡,并释放死亡肿瘤细胞碎片中的胞质双链DNA(dsDNA)进一步激活抗原提呈细胞(如DC细胞)中的cGAS-STING通路.通过建立铁死亡和cGAS-STING通路之间的连接可以快速启动全身抗肿瘤免疫响应,并增强免疫检查点疗法,从而抑制局部和转移性肿瘤的生长.