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Ion osmolarity-driven sequential concentration-enrichment for the scale-up isolation of extracellular vesicles. 离子渗透压驱动的顺序浓度富集,用于扩大细胞外囊泡的分离。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02956-w
Lizhi Wang, Junhao Xia, Xin Guan, Yang Song, Mengru Zhu, Fengya Wang, Baofeng Zhao, Lukuan Liu, Jing Liu

Extracellular vesicles (EVs) carry a variety of bioactive molecules and are becoming a promising alternative to cell therapy. Scale-up EV isolation is necessary for their functional studies and biological applications, while the traditional methods are challenged by low throughput, low yield, and potential damage. Herein, we developed an ion osmolarity-driven sequential concentration-enrichment strategy (IOSCE) for the EV isolation. IOSCE is composed of a novel superabsorbent polymers (SAPs) for EV concentration and a charged polymer for EV enrichment. Based on the driving force of ionic osmotic pressure, IOSCE can isolate EVs on a large scale from cell culture medium. The saturated water absorption capacity of IOSCE is 13.62 times higher than that of commercial SAPs. Compared with the ultracentrifugation method, IOSCE exhibited a 2.64 times higher yield (6.33 × 108 particles/mL). Moreover, the mesenchymal stem cell-derived EVs isolated using IOSCE demonstrate strong biological activity and can reduce neuroinflammation by affecting RNA metabolism and translation processes. IOSCE provides a cost-effective, high-throughput, and low-damage method for the scale up EV isolation, which is promising for disease diagnosis and treatment.

细胞外囊泡(EVs)携带多种生物活性分子,正在成为细胞疗法的一种有前途的替代方法。EVs的功能研究和生物应用离不开规模化的EVs分离,而传统方法面临着低通量、低产率和潜在损伤的挑战。在此,我们开发了一种离子渗透压驱动的连续浓缩富集策略(IOSCE),用于 EV 分离。IOSCE 由用于 EV 浓缩的新型超吸收聚合物(SAP)和用于 EV 富集的带电聚合物组成。基于离子渗透压的驱动力,IOSCE 可以从细胞培养基中大规模分离出 EV。IOSCE 的饱和吸水能力是商用 SAP 的 13.62 倍。与超速离心法相比,IOSCE 的产量高出 2.64 倍(6.33 × 108 颗粒/毫升)。此外,利用 IOSCE 分离的间充质干细胞衍生的 EVs 具有很强的生物活性,可通过影响 RNA 代谢和翻译过程减轻神经炎症。IOSCE提供了一种经济高效、高通量、低损伤的EV分离方法,有望用于疾病诊断和治疗。
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引用次数: 0
Nanocarriers for intracellular delivery of proteins in biomedical applications: strategies and recent advances. 生物医学应用中用于细胞内输送蛋白质的纳米载体:策略与最新进展。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02969-5
Chuanda Zhu, Jing Mu, Ling Liang

Protein drugs are of great importance in maintaining the normal functioning of living organisms. Indeed, they have been instrumental in combating tumors and genetic diseases for decades. Among these pharmaceutical agents, those that target intracellular components necessitate the use of therapeutic proteins to exert their effects within the targeted cells. However, the use of protein drugs is limited by their short half-life and potential adverse effects in the physiological environment. The advent of nanoparticles offers a promising avenue for prolonging the half-life of protein drugs. This is achieved by encapsulating proteins, thereby safeguarding their biological activity and ensuring precise delivery into cells. This nanomaterial-based intracellular protein drug delivery system mitigates the rapid hydrolysis and unwarranted diffusion of proteins, thereby minimizing potential side effects and circumventing the limitations inherent in traditional techniques like electroporation. This review examines established protein drug delivery systems, including those based on polymers, liposomes, and protein nanoparticles. We delve into the operational principles and transport mechanisms of nanocarriers, discussing the various considerations essential for designing cutting-edge delivery platforms. Additionally, we investigate innovative designs and applications of traditional cytosolic protein delivery systems in medical research and clinical practice, particularly in areas like tumor treatment, gene editing and fluorescence imaging. This review sheds light on the current restrictions of protein delivery systems and anticipates future research avenues, aiming to foster the continued advancement in this field.

蛋白质药物对维持生物体的正常功能具有重要意义。事实上,几十年来,蛋白质药物在抗击肿瘤和遗传疾病方面发挥了重要作用。在这些药物中,针对细胞内成分的药物必须使用治疗蛋白质才能在目标细胞内发挥作用。然而,蛋白质药物的半衰期较短,在生理环境中可能产生不良影响,这限制了蛋白质药物的使用。纳米粒子的出现为延长蛋白质药物的半衰期提供了一条大有可为的途径。这是通过封装蛋白质来实现的,从而保护了蛋白质的生物活性,并确保将其精确输送到细胞内。这种基于纳米材料的细胞内蛋白质给药系统可减轻蛋白质的快速水解和不必要的扩散,从而最大限度地减少潜在的副作用,并规避电穿孔等传统技术固有的局限性。本综述探讨了现有的蛋白质给药系统,包括基于聚合物、脂质体和蛋白质纳米颗粒的系统。我们深入探讨了纳米载体的工作原理和传输机制,讨论了设计尖端传输平台所必须考虑的各种因素。此外,我们还探讨了传统细胞膜蛋白质递送系统在医学研究和临床实践中的创新设计和应用,尤其是在肿瘤治疗、基因编辑和荧光成像等领域。这篇综述揭示了蛋白质递送系统目前存在的限制,并预测了未来的研究途径,旨在促进这一领域的持续发展。
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引用次数: 0
Correction: Preparation and characterization of BSA‑loaded liraglutide and platelet fragment nanoparticle delivery system for the treatment of diabetic atherosclerosis. 更正:用于治疗糖尿病动脉粥样硬化的 BSA 负载利拉鲁肽和血小板片段纳米颗粒给药系统的制备与表征。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02947-x
Mingping He, Ming Fang, Limin Fan, Alimujiang Maimaitijiang
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引用次数: 0
Genetically modified E. Coli secreting melanin (E.melanin) activates the astrocytic PSAP-GPR37L1 pathway and mitigates the pathogenesis of Parkinson's disease. 分泌黑色素的转基因大肠杆菌(E.melanin)能激活星形胶质细胞 PSAP-GPR37L1 通路,并减轻帕金森病的发病机制。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02955-x
Weixian Kong, Yu Liu, Pu Ai, Yong Bi, Chaoguang Wei, Xiaoyang Guo, Zhenyu Cai, Ge Gao, Peng Hu, Jialin Zheng, Jianhui Liu, Minfeng Huo, Yuting Guan, Qihui Wu

The characteristic neuropathology of Parkinson's disease (PD) involves the abnormal accumulation of phosphorylated α-synuclein (αSyn), as well as a significant decrease in neuromelanin (NM) levels within dopamine neurons (DaNs). Unlike αSyn aggregates, the relationship between NM levels and PD pathogenesis is not well understood. In this study, we engineered an E. coli MG1655 strain to produce exosomes containing melanin (E.melanin), and investigated its potential neuroprotective effects on DaNs in the context of PD. By employing a combination of cell cultures, biochemical studies, single nuclear RNA sequencing (snRNA seq), and various in vivo validations, we found that administration of E.melanin effectively alleviated DaNs loss and improved motor behavior impairments observed in both pharmacological and transgenic PD mouse models. Mechanistically, snRNA seq data suggested that E.melanin activated the PSAP-GPR37L1 signaling pathway specifically within astrocytes, leading to a reduction in astrocytic engulfment of synapses. Notably, activation of the GPR37L1 receptor using Tx14(A) peptide successfully rescued motor defects as well as protected against DaNs degeneration in mice with PD. Overall, our findings provide novel insights into understanding the molecular mechanisms underlying melanin's protective effects on DaNs in PD while offering potential strategies for manipulating and treating its pathophysiological progression.

帕金森病(PD)的特征性神经病理学包括磷酸化α-突触核蛋白(αSyn)的异常聚集,以及多巴胺神经元(DaNs)内神经髓鞘素(NM)水平的显著下降。与αSyn聚集不同,NM水平与帕金森病发病机制之间的关系尚不十分清楚。在本研究中,我们设计了一种大肠杆菌 MG1655 菌株来产生含有黑色素的外泌体(E.melanin),并研究了其在帕金森病中对 DaNs 的潜在神经保护作用。通过综合运用细胞培养、生化研究、单核糖核酸测序(snRNA seq)和各种体内验证,我们发现服用黑色素外泌体能有效缓解药物和转基因帕金森病小鼠模型中观察到的DaNs缺失,并改善运动行为障碍。从机理上讲,snRNA 序列数据表明,黑色素激活了星形胶质细胞内特异性的 PSAP-GPR37L1 信号通路,导致星形胶质细胞对突触的吞噬减少。值得注意的是,使用 Tx14(A) 肽激活 GPR37L1 受体成功地挽救了运动缺陷,并防止了帕金森病小鼠的 DaNs 退化。总之,我们的研究结果为了解黑色素对帕金森病 DaNs 的保护作用的分子机制提供了新的见解,同时也为操纵和治疗帕金森病的病理生理进展提供了潜在的策略。
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引用次数: 0
Silver nanoparticle induced immunogenic cell death can improve immunotherapy. 银纳米粒子诱导的免疫细胞死亡可改善免疫疗法。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02951-1
Ara Sargsian, Xanthippi Koutsoumpou, Hermon Girmatsion, Çan Egil, Kiana Buttiens, Carla Rios Luci, Stefaan J Soenen, Bella B Manshian

Cancer immunotherapy is often hindered by an immunosuppressive tumor microenvironment (TME). Various strategies are being evaluated to shift the TME from an immunologically 'cold' to 'hot' tumor and hereby improve current immune checkpoint blockades (ICB). One particular hot topic is the use of combination therapies. Here, we set out to screen a variety of metallic nanoparticles and explored their in vitro toxicity against a series of tumor and non-tumor cell lines. For silver nanoparticles, we also explored the effects of core size and surface chemistry on cytotoxicity. Ag-citrate-5 nm nanoparticles were found to induce high cytotoxicity in Renca cells through excessive generation of reactive oxygen species (ROS) and significantly increased cytokine production. The induced toxicity resulted in a shift of the immunogenic cell death (ICD) marker calreticulin to the cell surface in vitro and in vivo. Subcutaneous Renca tumors were treated with anti-PD1 or in combination with Ag-citrate-5 nm. The combination group resulted in significant reduction in tumor size, increased necrosis, and immune cell infiltration at the tumor site. Inhibition of cytotoxic CD8 + T cells confirmed the involvement of these cells in the observed therapeutic effects. Our results suggest that Ag-citrate-5 nm is able to promote immune cell influx and increase tumor responsiveness to ICB therapies.

癌症免疫疗法常常受到免疫抑制性肿瘤微环境(TME)的阻碍。目前正在评估各种策略,以将肿瘤微环境从免疫学上的 "冷 "环境转变为 "热 "环境,从而改善目前的免疫检查点阻断疗法(ICB)。其中一个特别热门的话题是使用联合疗法。在这里,我们开始筛选各种金属纳米粒子,并探索它们对一系列肿瘤和非肿瘤细胞系的体外毒性。对于银纳米粒子,我们还探讨了核心尺寸和表面化学成分对细胞毒性的影响。研究发现,柠檬酸银-5 nm 纳米粒子通过产生过多的活性氧(ROS)和显著增加细胞因子的产生,诱导 Renca 细胞产生高细胞毒性。诱导的毒性导致免疫原性细胞死亡(ICD)标志物钙网蛋白在体外和体内转移到细胞表面。用抗 PD1 或与 Ag-citrate-5 nm 联合治疗皮下 Renca 肿瘤。联合治疗组的肿瘤体积明显缩小,坏死增加,肿瘤部位的免疫细胞浸润明显减少。细胞毒性 CD8 + T 细胞的抑制证实了这些细胞参与了所观察到的治疗效果。我们的研究结果表明,Ag-citrate-5 nm 能够促进免疫细胞流入,提高肿瘤对 ICB 疗法的反应性。
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引用次数: 0
A collagenase-decorated Cu-based nanotheranostics: remodeling extracellular matrix for optimizing cuproptosis and MRI in pancreatic ductal adenocarcinoma. 胶原酶装饰的铜基纳米otheranostics:重塑细胞外基质,优化胰腺导管腺癌的杯突症和磁共振成像。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02968-6
Yining Wang, Qiaomei Zhou, Wangping Luo, Xiaoyan Yang, Jinguo Zhang, Yijie Lou, Jin Mao, Jiayi Chen, Fan Wu, Jue Hou, Guping Tang, Hongzhen Bai, Risheng Yu

Pancreatic ductal adenocarcinoma (PDAC), characterized by a dense extracellular matrix (ECM), presents significant therapeutic challenges due to its poor prognosis and high resistance to chemotherapy. Current chemodrugs and diagnostic agents largely fail to cross the barrier posed by the ECM, which severely limits the PDAC theranostics. This study introduces a novel theranostic strategy using thioether-hybridized hollow mesoporous organosilica nanoparticles (dsMNs) for the co-delivery of copper (Cu) and disulfiram (DSF), aiming to induce cuproptosis in PDAC cells. Our approach leverages the ECM-degrading enzyme collagenase, integrated with dsMNs, to enhance drug penetration by reducing matrix stiffness. Furthermore, the innovative use of a pancreatic cancer cell membrane coating on the nanoparticles enhances tumor targeting and stability (dsMCu-D@M-Co). The multifunctional platform not only facilitates deep drug penetration and triggers cuproptosis effectively but also utilizes the inherent properties of Cu to serve as a T1-weighted magnetic resonance imaging (MRI) contrast agent. In vitro and in vivo assessments demonstrate significant tumor size reduction in PDAC-bearing mice, highlighting the dual functionality of our platform in improving therapeutic efficacy and diagnostic precision. This integrated strategy represents a significant advancement in the management of PDAC, offering a promising new direction for overcoming one of the most lethal cancers.

胰腺导管腺癌(PDAC)以致密的细胞外基质(ECM)为特征,由于预后不良和对化疗的高度耐药性,给治疗带来了巨大挑战。目前的化疗药物和诊断药物大多无法穿过 ECM 构成的屏障,这严重限制了 PDAC 的治疗。本研究采用硫醚杂化中空介孔有机硅纳米颗粒(dsMNs)来联合递送铜(Cu)和双硫嘧啶(DSF),旨在诱导 PDAC 细胞的杯突变,从而提出了一种新的治疗策略。我们的方法利用了与dsMNs结合的ECM降解酶胶原酶,通过降低基质硬度来增强药物渗透。此外,在纳米粒子上创新性地使用了胰腺癌细胞膜涂层,增强了肿瘤靶向性和稳定性(dsMCu-D@M-Co)。该多功能平台不仅能促进药物的深层渗透,有效触发杯突症,还能利用铜的固有特性作为 T1 加权磁共振成像(MRI)造影剂。体外和体内评估表明,PDAC 小鼠的肿瘤体积明显缩小,这凸显了我们的平台在提高疗效和诊断精确度方面的双重功能。这一综合策略代表了 PDAC 治疗的重大进展,为攻克最致命的癌症之一提供了一个充满希望的新方向。
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引用次数: 0
Exploring the cytotoxic and antioxidant properties of lanthanide-doped ZnO nanoparticles: a study with machine learning interpretation. 探索掺杂镧系元素的氧化锌纳米粒子的细胞毒性和抗氧化特性:一项机器学习解释研究。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-10 DOI: 10.1186/s12951-024-02957-9
Jorge L Mejia-Mendez, Edwin E Reza-Zaldívar, A Sanchez-Martinez, O Ceballos-Sanchez, Diego E Navarro-López, L Marcelo Lozano, Juan Armendariz-Borunda, Naveen Tiwari, Daniel A Jacobo-Velázquez, Gildardo Sanchez-Ante, Edgar R López-Mena

Background: Lanthanide-based nanomaterials offer a promising alternative for cancer therapy because of their selectivity and effectiveness, which can be modified and predicted by leveraging the improved accuracy and enhanced decision-making of machine learning (ML) modeling.

Methods: In this study, erbium (Er3+) and ytterbium (Yb3+) were used to dope zinc oxide (ZnO) nanoparticles (NPs). Various characterization techniques and biological assays were employed to investigate the physicochemical and optical properties of the (Er, Yb)-doped ZnO NPs, revealing the influence of the lanthanide elements.

Results: The (Er, Yb)-doped ZnO NPs exhibited laminar-type morphologies, negative surface charges, and optical bandgaps that vary with the presence of Er3+ and Yb3+. The incorporation of lanthanide ions reduced the cytotoxicity activity of ZnO against HEPG-2, CACO-2, and U87 cell lines. Conversely, doping with Er3+ and Yb3+ enhanced the antioxidant activity of the ZnO against DPPH, ABTS, and H2O2 radicals. The extra tree (ET) and random forest (RF) models predicted the relevance of the characterization results vis-à-vis the cytotoxic properties of the synthesized NPs.

Conclusion: This study demonstrates, for the first time, the synthesis of ZnO NPs doped with Er and Yb via a solution polymerization route. According to characterization results, it was unveiled that the effect of optical bandgap variations influenced the cytotoxic performance of the developed lanthanide-doped ZnO NPs, being the undoped ZnO NPs the most cytotoxic ones. The presence alone or in combination of Er and Yb enhanced their scavenging capacity. ML models such as ET and RF efficiently demonstrated that the concentration and cell line type are key parameters that influence the cytotoxicity of (Er, Yb)-doped ZnO NPs achieving high accuracy rates of 98.96% and 98.67%, respectively. This study expands the knowledge of lanthanides as dopants of nanomaterials for biological and medical applications and supports their potential in cancer therapy by integrating robust ML approaches.

背景:基于镧系元素的纳米材料因其选择性和有效性而为癌症治疗提供了一种前景广阔的替代方案:本研究使用铒(Er3+)和镱(Yb3+)掺杂氧化锌(ZnO)纳米粒子(NPs)。为了研究掺杂了(Er, Yb)的氧化锌纳米粒子的物理化学和光学特性,我们采用了各种表征技术和生物检测方法,以揭示镧系元素的影响:结果:掺杂(Er、Yb)的 ZnO NPs 呈现出层状形态、负表面电荷以及随 Er3+ 和 Yb3+ 的存在而变化的光带隙。镧系离子的加入降低了氧化锌对 HEPG-2、CACO-2 和 U87 细胞系的细胞毒性活性。相反,掺杂 Er3+ 和 Yb3+ 则增强了氧化锌对 DPPH、ABTS 和 H2O2 自由基的抗氧化活性。额外树(ET)和随机森林(RF)模型预测了表征结果与合成纳米粒子细胞毒性特性的相关性:本研究首次证明了通过溶液聚合路线合成掺杂了铒和镱的氧化锌纳米粒子。表征结果表明,光带隙的变化影响了掺杂镧系元素 ZnO NPs 的细胞毒性,其中未掺杂 ZnO NPs 的细胞毒性最强。铒和镱的单独或混合存在增强了它们的清除能力。ET和RF等ML模型有效地证明了浓度和细胞系类型是影响(Er, Yb)掺杂ZnO NPs细胞毒性的关键参数,准确率分别高达98.96%和98.67%。这项研究拓展了镧系元素作为纳米材料掺杂剂在生物和医学应用方面的知识,并通过整合稳健的多线性方法支持了镧系元素在癌症治疗方面的潜力。
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引用次数: 0
Manipulation in root-associated microbiome via carbon nanosol for plant growth improvements. 通过纳米碳溶胶操纵根相关微生物群以改善植物生长。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-09 DOI: 10.1186/s12951-024-02971-x
Lingtong Cheng, Jiemeng Tao, Peng Lu, Taibo Liang, Xutao Li, Dong Chang, Huan Su, Wei He, Zechao Qu, He Li, Wenjun Mu, Wei Zhang, Nan Liu, Jianfeng Zhang, Peijian Cao, Jingjing Jin

Background: Modulating the microbiome with nanomaterials has been proposed to improve plant growth, and reduce reliance on external inputs. Carbon Nanosol (CNS) was attracted for its potential to improve plant productivity. However, the mechanism between CNS and rhizosphere microorganisms remained largely elusive.

Results: Here, we tried to systematically explore the effects of CNS (600 and 1200 mg/L by concentration) on tobacco growth, soil physical properties, and root-associated microbiome. The influence of CNS on soil physicochemical properties and plant growth was significant and dose-dependent, leading to a 28.82% increase in biomass accumulation by 600 mg/L CNS. Comparison between the CNS-treated and control plants revealed significant differences in microbiome composition, including 1148 distinct ASVs (923 bacteria and 225 fungi), microbiome interactions, and metabolic function of root-associated microbiomes. Fungal and bacterial communities had different response patterns for CNS treatment, with phased and dose-dependent effects, with the most significant changes in microbial community structure observed at 1200 mg/L after 10 days of treatment. Microbial networks of CNS-treated plants had more nodes and edges, higher connectivity, and more hub microorganisms than those of control plants. Compared with control, CNS significantly elevated abundances of various bacterial biomarkers (such as Sphingomonas and Burkholderia) and fungi biomarkers (including Penicillium, Myceliophthora, and Talaromyces), which were potential plant-beneficial organisms. Functional prediction based on metagenomic data demonstrated pathways related to nutrient cycling being greatly enriched under CNS treatment. Furthermore, 391 culturable bacteria and 44 culturable fungi were isolated from soil and root samples. Among them, six bacteria and two fungi strains enriched upon CNS treatment were validated to have plant growth promotion effect, and two fungi (Cladosporium spp. and Talaromyces spp.) played their roles by mediating volatile organic compounds (VOCs). To some extent, the driving and shaping of the microbiome by CNS contributed to its impact on plant growth and development.

Conclusion: Our results revealed the key role of root-associated microbiota in mediating the interaction between CNS and plants, thus providing valuable insights and strategies for harnessing CNS to enhance plant growth.

背景:有人提出用纳米材料调节微生物组来改善植物生长,减少对外部投入的依赖。纳米碳溶胶(CNS)因其提高植物生产力的潜力而备受关注。然而,纳米碳溶胶与根瘤微生物之间的作用机理在很大程度上仍然难以捉摸:结果:在此,我们试图系统地探讨纳米碳溶胶(浓度分别为 600 毫克/升和 1200 毫克/升)对烟草生长、土壤物理特性和根相关微生物群的影响。CNS 对土壤理化性质和植物生长的影响显著,且呈剂量依赖性,600 毫克/升 CNS 可使生物量积累增加 28.82%。对比 CNS 处理过的植物和对照植物,发现微生物群组成存在显著差异,包括 1148 种不同的 ASV(923 种细菌和 225 种真菌)、微生物群相互作用以及根相关微生物群的代谢功能。真菌和细菌群落对 CNS 处理有不同的反应模式,具有阶段性和剂量依赖性效应,处理 10 天后,在 1200 毫克/升浓度下观察到的微生物群落结构变化最为显著。与对照植物相比,CNS 处理植物的微生物网络具有更多的节点和边缘、更高的连通性和更多的中枢微生物。与对照组相比,CNS 显著提高了各种细菌生物标志物(如鞘氨单胞菌和伯克霍尔德氏菌)和真菌生物标志物(包括青霉、嗜菌菌和担子菌)的丰度,而这些生物标志物都是潜在的对植物有益的生物。根据元基因组数据进行的功能预测表明,在 CNS 处理下,与养分循环相关的途径大大丰富。此外,从土壤和根部样本中分离出了 391 种可培养细菌和 44 种可培养真菌。其中,6 种细菌和 2 种真菌在 CNS 处理后富集,被证实具有促进植物生长的作用,2 种真菌(Cladosporium spp.在某种程度上,中枢神经系统对微生物组的驱动和塑造有助于其对植物生长和发育的影响:我们的研究结果揭示了根相关微生物群在介导中枢神经系统与植物之间相互作用中的关键作用,从而为利用中枢神经系统促进植物生长提供了有价值的见解和策略。
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引用次数: 0
Binding-driven forward tearing protospacer activated CRISPR-Cas12a system and applications for microRNA detection. 结合驱动的前向撕裂原位激活 CRISPR-Cas12a 系统及其在 microRNA 检测中的应用。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-08 DOI: 10.1186/s12951-024-02915-5
Lina Zhao, Xiangyu Deng, Yuqing Li, Qing Zhao, Lizhu Xiao, Jianjiang Xue, Anyi Chen, Wei Cheng, Min Zhao

CRISPR-Cas12a system, characterized by its precise sequence recognition and cleavage activity, has emerged as a powerful and programmable tool for molecular diagnostics. However, current CRISPR-Cas12a-based nucleic acid detection methods, particularly microRNA (miRNA) detection, necessitate additional bio-engineering strategies to exert control over Cas12a activity. Herein, we propose an engineered target-responsive hairpin DNA activator (TRHDA) to mediate forward tearing protospacer activated CRISPR-Cas12a system, which enables direct miRNA detection with high specificity and sensitivity. Target miRNA specifically binding to hairpin DNA can drive forward tearing protospacer in the stem sequence of hairpin structure, facilitating the complementarity between crRNA spacer and protospacer to activate Cas12a. Upon the hairpin DNA as input-responsive activator of Cas12a, a universal biosensing method enables the multiple miRNAs (miR-21, let-7a, miR-30a) detection and also has exceptional capability in identifying single-base mismatches and distinguishing homologous let-7/miR-30 family members. Besides, TRHDA-mediated Cas12a-powered biosensing has realized the evaluation of miR-21 expression levels in diverse cellular contexts by intracellular imaging. Considering the easy programmability of hairpin DNA in responsive region, this strategy could expand for the other target molecules detection (e.g., proteins, micromolecules, peptides, exosomes), which offers significant implications for biomarkers diagnostics utilizing the CRISPR-Cas12a system toolbox.

CRISPR-Cas12a 系统以其精确的序列识别和裂解活性为特点,已成为分子诊断领域一种强大的可编程工具。然而,目前基于CRISPR-Cas12a的核酸检测方法,尤其是microRNA(miRNA)检测,需要额外的生物工程策略来控制Cas12a的活性。在这里,我们提出了一种工程化的靶响应发夹DNA激活剂(TRHDA)来介导前向撕裂原位激活CRISPR-Cas12a系统,从而实现高特异性和高灵敏度的直接miRNA检测。目标 miRNA 与发夹 DNA 特异性结合后,可在发夹结构的茎序列中驱动前向撕裂原位聚合体,促进 crRNA spacer 与原位聚合体的互补,从而激活 Cas12a。利用发夹 DNA 作为 Cas12a 的输入响应激活剂,一种通用的生物传感方法可实现多种 miRNA(miR-21、let-7a、miR-30a)的检测,而且在识别单碱基错配和区分同源的 let-7/miR-30 家族成员方面也具有卓越的能力。此外,TRHDA 介导的 Cas12a 驱动生物传感技术通过细胞内成像实现了对不同细胞环境中 miR-21 表达水平的评估。考虑到发夹 DNA 在响应区的可编程性,这种策略可以扩展到其他目标分子(如蛋白质、微分子、肽、外泌体)的检测,这对利用 CRISPR-Cas12a 系统工具箱进行生物标记物诊断具有重要意义。
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引用次数: 0
Tetrahedral framework nucleic acids inhibit Aβ-mediated ferroptosis and ameliorate cognitive and synaptic impairments in Alzheimer's disease. 四面体框架核酸可抑制 Aβ 介导的铁突变,改善阿尔茨海默病的认知和突触损伤。
IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Pub Date : 2024-11-07 DOI: 10.1186/s12951-024-02963-x
Lu Tan, Jiazhao Xie, Chenqi Liao, Xiaoguang Li, Weiyun Zhang, Changchun Cai, Liming Cheng, Xiong Wang

Background: Ferroptosis represents a nonapoptotic type of programmed cell death induced by excessive intracellular iron accumulation. Ferroptosis is an essential driver of the pathogenesis of Alzheimer's disease (AD). Tetrahedral framework nucleic acids (tFNAs) are a novel type of nanoparticle with superior antiapoptotic capacity and excellent biocompatibility. However, the effect of tFNAs on Aβ triggered ferroptosis, cognitive and synaptic impairments in AD remains unknown.

Methods: N2a cells were treated with Aβ combined with/without tFNAs. Cell viability and levels of Fe2+, lipid peroxidation, MDA, LDH, and GSH were examined. RNA sequencing was applied to explore dysregulated ferroptosis related genes. Seven-month-old APP/PS1 mice were intranasally administrated with tFNAs for two weeks. Fluorescence imaging was used to detect the tFNAs distribution in the brain. Novel object recognition (NOR) test followed by Morris water maze (MWM) was used to test the learning and memory performance of mice. Golgi staining, Western blot, and immunofluorescence staining were used to examine synaptic plasticity.

Results: tFNAs promoted cell viability and GSH levels, reduced the levels of Fe2+, lipid peroxidation, MDA, and LDH in N2a cells treated with Aβ. RNA sequencing revealed that tFNAs reversed the promotive effect of Aβ on ferroptosis driver Atf3 gene and suppressive effect on ferroptosis suppressors Rrm2 and Furin genes. Fluorescence imaging confirmed the brain infiltration of tFNAs. tFNAs rescued synaptic and memory impairments, and ferroptosis in seven-month-old APP/PS1 mice.

Conclusions: Collectively, tFNAs inhibited Aβ-mediated ferroptosis and ameliorated cognitive and synaptic impairments in AD mice. tFNAs may serve as novel option to deal with AD.

背景:铁凋亡是一种非凋亡性的细胞程序性死亡,由细胞内铁的过度积累诱发。铁凋亡是阿尔茨海默病(AD)发病机制的重要驱动因素。四面体框架核酸(tFNAs)是一种新型纳米粒子,具有卓越的抗细胞凋亡能力和良好的生物相容性。然而,tFNAs对Aβ引发的铁凋亡、AD认知和突触损伤的影响仍是未知数:方法:用Aβ结合/不结合tFNAs处理N2a细胞。方法:用 Aβ 结合/不结合 tFNAs 处理 N2a 细胞,检测细胞活力和 Fe2+、脂质过氧化、MDA、LDH 和 GSH 水平。应用 RNA 测序来探索与铁突变相关的失调基因。给七个月大的 APP/PS1 小鼠鼻内注射 tFNAs,为期两周。利用荧光成像检测tFNAs在大脑中的分布。用新物体识别(NOR)测试和莫里斯水迷宫(MWM)测试小鼠的学习和记忆能力。结果表明:tFNAs能提高Aβ处理的N2a细胞的活力和GSH水平,降低Fe2+、脂质过氧化、MDA和LDH水平。RNA 测序显示,tFNAs 逆转了 Aβ 对铁氧化驱动基因 Atf3 的促进作用,以及对铁氧化抑制基因 Rrm2 和 Furin 的抑制作用。荧光成像证实了 tFNAs 在大脑中的浸润。tFNAs 可挽救 7 个月大的 APP/PS1 小鼠的突触和记忆损伤以及铁突变:总之,tFNAs 可抑制 Aβ 介导的铁突变,改善 AD 小鼠的认知和突触损伤。
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引用次数: 0
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Journal of Nanobiotechnology
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