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Investigating the Influence of Heterogeneity Within Cell Types on Microvessel Network Transport 研究细胞类型异质性对微血管网络运输的影响
IF 2.8 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-11-29 DOI: 10.1007/s12195-023-00790-y
Junyu Nan, Sayan Roychowdhury, Amanda Randles

Background

Current research on the biophysics of circulating tumor cells often overlooks the heterogeneity of cell populations, focusing instead on average cellular properties. This study aims to address the gap by considering the diversity of cell biophysical characteristics and their implications on cancer spread.

Methods

We utilized computer simulations to assess the influence of variations in cell size and membrane elasticity on the behavior of cells within fluid environments. The study controlled cell and fluid properties to systematically investigate the transport of tumor cells through a simulated network of branching channels.

Results

The simulations revealed that even minor differences in cellular properties, such as slight changes in cell radius or shear elastic modulus, lead to significant changes in the fluid conditions that cells experience, including velocity and wall shear stress (p < 0.001).

Conclusion

The findings underscore the importance of considering cell heterogeneity in biophysical studies and suggest that small variations in cellular characteristics can profoundly impact the dynamics of tumor cell circulation. This has potential implications for understanding the mechanisms of cancer metastasis and the development of therapeutic strategies.

当前关于循环肿瘤细胞生物物理学的研究往往忽略了细胞群的异质性,而将重点放在平均细胞特性上。本研究旨在通过考虑细胞生物物理特性的多样性及其对癌症扩散的影响来解决这一差距。方法利用计算机模拟方法研究细胞大小和膜弹性的变化对细胞在流体环境中行为的影响。该研究控制了细胞和流体特性,系统地研究了肿瘤细胞通过模拟分支通道网络的运输。模拟结果显示,即使细胞性质的微小差异,如细胞半径或剪切弹性模量的微小变化,也会导致细胞所经历的流体条件发生显著变化,包括速度和壁面剪切应力(p < 0.001)。结论这些发现强调了在生物物理研究中考虑细胞异质性的重要性,并表明细胞特性的微小变化可以深刻影响肿瘤细胞循环的动力学。这对理解癌症转移的机制和制定治疗策略具有潜在的意义。
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引用次数: 0
Three-Dimensional Fractal Analysis of the Interstitial Cells of Cajal Networks of Gastrointestinal Tissue Specimens 胃肠组织标本Cajal网络间质细胞的三维分形分析
IF 2.8 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-11-27 DOI: 10.1007/s12195-023-00789-5
Sue Ann Mah, Recep Avci, Jean-Marie Vanderwinden, Peng Du

Introduction

Several functional gastrointestinal disorders (FGIDs) have been associated with the degradation or remodeling of the network of interstitial cells of Cajal (ICC). Introducing fractal analysis to the field of gastroenterology as a promising data analytics approach to extract key structural characteristics that may provide insightful features for machine learning applications in disease diagnostics. Fractal geometry has advantages over several physically based parameters (or classical metrics) for analysis of intricate and complex microstructures that could be applied to ICC networks.

Methods

In this study, three fractal structural parameters: Fractal Dimension, Lacunarity, and Succolarity were employed to characterize scale-invariant complexity, heterogeneity, and anisotropy; respectively of three types of gastric ICC network structures from a flat-mount transgenic mouse stomach.

Results

The Fractal Dimension of ICC in the longitudinal muscle layer was found to be significantly lower than ICC in the myenteric plexus and circumferential muscle in the proximal, and distal antrum, respectively (both p < 0.0001). Conversely, the Lacunarity parameters for ICC-LM and ICC-CM were found to be significantly higher than ICC-MP in the proximal and in the distal antrum, respectively (both p < 0.0001). The Succolarity measures of ICC-LM network in the aboral direction were found to be consistently higher in the proximal than in the distal antrum (p < 0.05).

Conclusions

The fractal parameters presented here could go beyond the limitation of classical metrics to provide better understanding of the structural-functional relationship between ICC networks and the conduction of gastric bioelectrical slow waves.

几种功能性胃肠疾病(fgid)与Cajal (ICC)间质细胞网络的降解或重塑有关。将分形分析引入胃肠病学领域,作为一种有前途的数据分析方法来提取关键结构特征,这些特征可能为机器学习在疾病诊断中的应用提供有见地的特征。分形几何比几种基于物理的参数(或经典度量)具有优势,可用于分析ICC网络中错综复杂的微观结构。方法本研究采用分形维数、缺度和分形三个分形结构参数来表征尺度不变复杂性、非均质性和各向异性;三种类型的胃ICC网络结构分别来自平装转基因小鼠胃。结果纵肌层ICC分形维数显著低于肌丛ICC分形维数(p < 0.0001),明显低于上颌窦近端、远端肌周肌层ICC分形维数。相反,我们发现ICC-LM和ICC-CM的腔隙参数在近端和远端分别显著高于ICC-MP (p < 0.0001)。ICC-LM网络在离口方向的锥度测量在近端上颌窦始终高于远端上颌窦(p < 0.05)。结论本文提出的分形参数可以超越经典指标的限制,更好地理解ICC网络与胃生物电慢波传导的结构-功能关系。
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引用次数: 0
The 2023 CMBE Young Innovators: ChatGPT Gets the Final Word 2023年CMBE青年创新者:ChatGPT获得最终决定权
4区 医学 Q3 BIOPHYSICS Pub Date : 2023-10-30 DOI: 10.1007/s12195-023-00788-6
Alisa Morss Clyne, Owen J. T. McCarty, Michael R. King
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引用次数: 0
Head-to-Head Comparison of CCN4, DNMT3A, PTPN11, and SPARC as Suppressors of Anti-tumor Immunity CCN4、DNMT3A、PTPN11和SPARC作为抗肿瘤免疫抑制因子的对照研究
4区 医学 Q3 BIOPHYSICS Pub Date : 2023-10-28 DOI: 10.1007/s12195-023-00787-7
Anika C. Pirkey, Wentao Deng, Danielle Norman, Atefeh Razazan, David J. Klinke
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引用次数: 0
Engineered Extracellular Vesicle-Based Therapies for Valvular Heart Disease. 工程细胞外囊泡治疗瓣膜性心脏病。
IF 2.3 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-09-26 eCollection Date: 2023-08-01 DOI: 10.1007/s12195-023-00783-x
Ana I Salazar-Puerta, Mia Kordowski, Tatiana Z Cuellar-Gaviria, Maria A Rincon-Benavides, Jad Hussein, Dorma Flemister, Gabriel Mayoral-Andrade, Grant Barringer, Elizabeth Guilfoyle, Britani N Blackstone, Binbin Deng, Diana Zepeda-Orozco, David W McComb, Heather Powell, Lakshmi P Dasi, Daniel Gallego-Perez, Natalia Higuita-Castro

Introduction: Valvular heart disease represents a significant burden to the healthcare system, with approximately 5 million cases diagnosed annually in the US. Among these cases, calcific aortic stenosis (CAS) stands out as the most prevalent form of valvular heart disease in the aging population.  CAS is characterized by the progressive calcification of the aortic valve leaflets, leading to valve stiffening. While aortic valve replacement is the standard of care for CAS patients, the long-term durability of prosthetic devices is poor, calling for innovative strategies to halt  or reverse disease progression. Here, we explor the potential use of novel extracellular vesicle (EV)-based nanocarriers for delivering molecular payloads to the affected valve tissue. This approach aims to reduce inflammation and potentially promote resorption of the calcified tissue.

Methods: Engineered EVs loaded with the reprogramming myeloid transcription factors, CEBPA and Spi1, known to mediate the transdifferentiation of committed endothelial cells into macrophages. We evaluated the ability of these engineered EVs to deliver DNA and transcripts encoding CEBPA and Spil into calcified aortic valve tissue obtained from patients undergoing valve replacement due to aortic stenosis. We also investigated whether these EVs could induce the transdifferentiation of endothelial cells into macrophage-like cells.

Results: Engineered EVs loaded with CEBPA + Spi1 were successfully derived from human dermal fibroblasts. Peak EV loading was found to be at 4 h after nanotransfection of donor cells.  These CEBPA + Spi1 loaded EVs effectively transfected aortic valve cells, resulting in the successful induction of transdifferentiation, both in vitro with  endothelial cells and ex vivo with valvular endothelial cells, leading to the development of anti-inflammatory macrophage-like cells.

Conclusions: Our findings highlight the potential of engineered EVs as a next generation nanocarrier to target aberrant calcifications on diseased heart valves. This development holds promise as a novel therapy for high-risk patients who may not be suitable candidates for valve replacement surgery.

Supplementary information: The online version contains supplementary material available at 10.1007/s12195-023-00783-x.

简介:瓣膜性心脏病是医疗系统的一大负担,美国每年约有500万例确诊病例。在这些病例中,钙化性主动脉瓣狭窄(CAS)是老年人口中最常见的瓣膜性心脏疾病。CAS的特征是主动脉瓣叶进行性钙化,导致瓣膜硬化。虽然主动脉瓣置换术是CAS患者的标准护理,但人工装置的长期耐用性较差,需要创新策略来阻止或逆转疾病进展。在这里,我们探索了新型基于细胞外囊泡(EV)的纳米载体在向受影响的瓣膜组织递送分子有效载荷方面的潜在用途。这种方法旨在减少炎症,并可能促进钙化组织的吸收。方法:负载重编程骨髓转录因子CEBPA和Spi1的工程EVs,已知可介导定向内皮细胞转分化为巨噬细胞。我们评估了这些工程EVs将编码CEBPA和Spil的DNA和转录物递送到钙化主动脉瓣组织中的能力,这些钙化主动脉瓣是从因主动脉狭窄而进行瓣膜置换的患者获得的。我们还研究了这些EVs是否可以诱导内皮细胞转分化为巨噬细胞样细胞。结果:装有CEBPA的工程电动汽车 + Spi1成功地来源于人真皮成纤维细胞。发现EV负载峰值在供体细胞纳米转染后4小时。这些CEBPA + Spi1负载的EVs有效地转染了主动脉瓣细胞,导致在体外用内皮细胞和离体用瓣膜内皮细胞成功诱导转分化,从而形成抗炎巨噬细胞样细胞。结论:我们的发现突出了工程EVs作为下一代纳米载体靶向病变心脏瓣膜异常钙化的潜力。这一进展有望成为一种新的治疗方法,用于可能不适合瓣膜置换手术的高危患者。补充信息:在线版本包含补充材料,请访问10.1007/s12195-023-00783-x。
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引用次数: 0
The 2023 Young Innovators of Cellular and Molecular Bioengineering. 2023年细胞和分子生物工程的年轻创新者。
IF 2.3 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-09-22 eCollection Date: 2023-08-01 DOI: 10.1007/s12195-023-00785-9
Michael R King, Owen J T McCarty, Alisa Morss Clyne
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引用次数: 0
Elucidating Mechanotransduction Processes During Magnetomechanical Neuromodulation Mediated by Magnetic Nanodiscs. 阐明磁性纳米盘介导的磁机械神经调控过程中的机械传导过程。
IF 2.3 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-09-20 eCollection Date: 2023-08-01 DOI: 10.1007/s12195-023-00786-8
Amanda Gomez, Nicolas Muzzio, Ania Dudek, Athena Santi, Carolina Redondo, Raquel Zurbano, Rafael Morales, Gabriela Romero

Purpose: Noninvasive cell-type-specific manipulation of neural signaling is critical in basic neuroscience research and in developing therapies for neurological disorders. Magnetic nanotechnologies have emerged as non-invasive neuromodulation approaches with high spatiotemporal control. We recently developed a wireless force-induced neurostimulation platform utilizing micro-sized magnetic discs (MDs) and low-intensity alternating magnetic fields (AMFs). When targeted to the cell membrane, MDs AMFs-triggered mechanoactuation enhances specific cell membrane receptors resulting in cell depolarization. Although promising, it is critical to understand the role of mechanical forces in magnetomechanical neuromodulation and their transduction to molecular signals for its optimization and future translation.

Methods: MDs are fabricated using top-down lithography techniques, functionalized with polymers and antibodies, and characterized for their physical properties. Primary cortical neurons co-cultured with MDs and transmembrane protein chemical inhibitors are subjected to 20 s pulses of weak AMFs (18 mT, 6 Hz). Calcium cell activity is recorded during AMFs stimulation.

Results: Neuronal activity in primary rat cortical neurons is evoked by the AMFs-triggered actuation of targeted MDs. Ion channel chemical inhibition suggests that magnetomechanical neuromodulation results from MDs actuation on Piezo1 and TRPC1 mechanosensitive ion channels. The actuation mechanisms depend on MDs size, with cell membrane stretch and stress caused by the MDs torque being the most dominant.

Conclusions: Magnetomechanical neuromodulation represents a tremendous potential since it fulfills the requirements of negligible heating (ΔT < 0.1 °C) and weak AMFs (< 100 Hz), which are limiting factors in the development of therapies and the design of clinical equipment.

Supplementary information: The online version contains supplementary material available at 10.1007/s12195-023-00786-8.

目的:神经信号的非侵入性细胞类型特异性操作在基础神经科学研究和开发神经疾病治疗方法中至关重要。磁性纳米技术已经成为具有高度时空控制的非侵入性神经调控方法。我们最近开发了一种利用微型磁盘(MD)和低强度交变磁场(AMF)的无线力诱导神经刺激平台。当靶向细胞膜时,MDs-AMFs触发的机械激活增强了特定的细胞膜受体,导致细胞去极化。尽管很有前景,但了解机械力在磁机械神经调控中的作用及其对分子信号的转导对于其优化和未来的翻译至关重要。方法:使用自上而下的光刻技术制造MD,用聚合物和抗体进行功能化,并对其物理性能进行表征。与MD和跨膜蛋白化学抑制剂共培养的原代皮层神经元受到20s脉冲的弱AMF(18mT,6Hz)。在AMFs刺激过程中记录钙细胞活性。结果:AMFs触发靶向MD的致动可诱发原代大鼠皮层神经元的神经元活动。离子通道化学抑制表明,磁机械神经调控是由Piezo1和TRPC1机械敏感离子通道上的MD驱动引起的。驱动机制取决于MDs的大小,其中细胞膜拉伸和MDs扭矩引起的应力是最主要的。结论:磁机械神经调控表现出巨大的潜力,因为它满足了可忽略的加热(ΔT 补充信息:在线版本包含补充材料,请访问10.1007/s12195-023-00786-8。
{"title":"Elucidating Mechanotransduction Processes During Magnetomechanical Neuromodulation Mediated by Magnetic Nanodiscs.","authors":"Amanda Gomez, Nicolas Muzzio, Ania Dudek, Athena Santi, Carolina Redondo, Raquel Zurbano, Rafael Morales, Gabriela Romero","doi":"10.1007/s12195-023-00786-8","DOIUrl":"10.1007/s12195-023-00786-8","url":null,"abstract":"<p><strong>Purpose: </strong>Noninvasive cell-type-specific manipulation of neural signaling is critical in basic neuroscience research and in developing therapies for neurological disorders. Magnetic nanotechnologies have emerged as non-invasive neuromodulation approaches with high spatiotemporal control. We recently developed a wireless force-induced neurostimulation platform utilizing micro-sized magnetic discs (MDs) and low-intensity alternating magnetic fields (AMFs). When targeted to the cell membrane, MDs AMFs-triggered mechanoactuation enhances specific cell membrane receptors resulting in cell depolarization. Although promising, it is critical to understand the role of mechanical forces in magnetomechanical neuromodulation and their transduction to molecular signals for its optimization and future translation.</p><p><strong>Methods: </strong>MDs are fabricated using top-down lithography techniques, functionalized with polymers and antibodies, and characterized for their physical properties. Primary cortical neurons co-cultured with MDs and transmembrane protein chemical inhibitors are subjected to 20 s pulses of weak AMFs (18 mT, 6 Hz). Calcium cell activity is recorded during AMFs stimulation.</p><p><strong>Results: </strong>Neuronal activity in primary rat cortical neurons is evoked by the AMFs-triggered actuation of targeted MDs. Ion channel chemical inhibition suggests that magnetomechanical neuromodulation results from MDs actuation on Piezo1 and TRPC1 mechanosensitive ion channels. The actuation mechanisms depend on MDs size, with cell membrane stretch and stress caused by the MDs torque being the most dominant.</p><p><strong>Conclusions: </strong>Magnetomechanical neuromodulation represents a tremendous potential since it fulfills the requirements of negligible heating (ΔT < 0.1 °C) and weak AMFs (< 100 Hz), which are limiting factors in the development of therapies and the design of clinical equipment.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s12195-023-00786-8.</p>","PeriodicalId":9687,"journal":{"name":"Cellular and molecular bioengineering","volume":"16 4","pages":"283-298"},"PeriodicalIF":2.3,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10550892/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41108674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nuclear Entry of DNA and Transgene Expression in Dividing and Non-dividing Cells 分裂细胞和非分裂细胞中DNA的细胞核进入和转基因表达
4区 医学 Q3 BIOPHYSICS Pub Date : 2023-09-17 DOI: 10.1007/s12195-023-00784-w
Justin Sylvers, Yifei Wang, Fan Yuan
{"title":"Nuclear Entry of DNA and Transgene Expression in Dividing and Non-dividing Cells","authors":"Justin Sylvers, Yifei Wang, Fan Yuan","doi":"10.1007/s12195-023-00784-w","DOIUrl":"https://doi.org/10.1007/s12195-023-00784-w","url":null,"abstract":"","PeriodicalId":9687,"journal":{"name":"Cellular and molecular bioengineering","volume":"694 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135257272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
siRNA Lipid-Polymer Nanoparticles Targeting E-Selectin and Cyclophilin A in Bone Marrow for Combination Multiple Myeloma Therapy. 靶向骨髓中E-选择素和亲环素A的siRNA脂质聚合物纳米粒子用于联合治疗多发性骨髓瘤。
IF 2.3 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-09-14 eCollection Date: 2023-08-01 DOI: 10.1007/s12195-023-00774-y
Christian G Figueroa-Espada, Pedro P G Guimarães, Rachel S Riley, Lulu Xue, Karin Wang, Michael J Mitchell

Introduction: Multiple myeloma (MM) is a hematological blood cancer of the bone marrow that remains largely incurable, in part due to its physical interactions with the bone marrow microenvironment. Such interactions enhance the homing, proliferation, and drug resistance of MM cells. Specifically, adhesion receptors and homing factors, E-selectin (ES) and cyclophilin A (CyPA), respectively, expressed by bone marrow endothelial cells enhance MM colonization and dissemination. Thus, silencing of ES and CyPA presents a potential therapeutic strategy to evade MM spreading. However, small molecule inhibition of ES and CyPA expressed by bone marrow endothelial cells remains challenging, and blocking antibodies induce further MM propagation. Therefore, ES and CyPA are promising candidates for inhibition via RNA interference (RNAi).

Methods: Here, we utilized a previously developed lipid-polymer nanoparticle for RNAi therapy, that delivers siRNA to the bone marrow perivascular niche. We utilized our platform to co-deliver ES and CyPA siRNAs to prevent MM dissemination in vivo.

Results: Lipid-polymer nanoparticles effectively downregulated ES expression in vitro, which decreased MM cell adhesion and migration through endothelial monolayers. Additionally, in vivo delivery of lipid-polymer nanoparticles co-encapsulating ES and CyPA siRNA extended survival in a xenograft mouse model of MM, either alone or in combination with the proteasome inhibitor bortezomib.

Conclusions: Our combination siRNA lipid-polymer nanoparticle therapy presents a vascular microenvironment-targeting strategy as a potential paradigm shift for MM therapies, which could be extended to other cancers that colonize the bone marrow.

Supplementary information: The online version contains supplementary material available at 10.1007/s12195-023-00774-y.

简介:多发性骨髓瘤(MM)是一种骨髓癌症,在很大程度上仍然无法治愈,部分原因是其与骨髓微环境的物理相互作用。这种相互作用增强MM细胞的归巢、增殖和耐药性。具体而言,骨髓内皮细胞分别表达的粘附受体和归巢因子E-选择素(ES)和亲环素A(CyPA)增强了MM的定植和扩散。因此,ES和CyPA的沉默提供了一种潜在的治疗策略来逃避MM的传播。然而,骨髓内皮细胞表达的ES和CyPA的小分子抑制仍然具有挑战性,阻断抗体诱导MM的进一步繁殖。因此,ES和CyPA是通过RNA干扰(RNAi)抑制的有希望的候选者。方法:在这里,我们使用了一种先前开发的脂质聚合物纳米颗粒进行RNAi治疗,该纳米颗粒将siRNA递送到骨髓血管周围小生境。我们利用我们的平台共同递送ES和CyPA siRNA,以防止MM在体内传播。结果:脂质聚合物纳米颗粒在体外有效下调ES的表达,降低MM细胞通过内皮单层的粘附和迁移。此外,共包封ES和CyPA siRNA的脂质聚合物纳米颗粒的体内递送延长了MM异种移植小鼠模型中的存活率,无论是单独递送还是与蛋白酶体抑制剂硼替佐米组合递送。结论:我们的siRNA脂质聚合物纳米颗粒联合治疗提供了一种血管微环境靶向策略,作为MM治疗的潜在范式转变,可以扩展到其他骨髓定植的癌症。补充信息:在线版本包含补充材料,请访问10.1007/s12195-023-00774-y。
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引用次数: 0
Amyloid-β Pathology-Specific Cytokine Secretion Suppresses Neuronal Mitochondrial Metabolism. 淀粉样蛋白-β病理学特异性细胞因子分泌抑制神经元线粒体代谢。
IF 2.8 4区 医学 Q3 BIOPHYSICS Pub Date : 2023-09-11 eCollection Date: 2023-08-01 DOI: 10.1007/s12195-023-00782-y
Madison K Kuhn, Rebecca M Fleeman, Lynne M Beidler, Amanda M Snyder, Dennis C Chan, Elizabeth A Proctor

Introduction: Neuroinflammation and metabolic dysfunction are early alterations in Alzheimer's disease (AD) brain that are thought to contribute to disease onset and progression. Glial activation due to protein deposition results in cytokine secretion and shifts in brain metabolism, which have been observed in AD patients. However, the mechanism by which this immunometabolic feedback loop can injure neurons and cause neurodegeneration remains unclear.

Methods: We used Luminex XMAP technology to quantify hippocampal cytokine concentrations in the 5xFAD mouse model of AD at milestone timepoints in disease development. We used partial least squares regression to build cytokine signatures predictive of disease progression, as compared to healthy aging in wild-type littermates. We applied the disease-defining cytokine signature to wild-type primary neuron cultures and measured downstream changes in gene expression using the NanoString nCounter system and mitochondrial function using the Seahorse Extracellular Flux live-cell analyzer.

Results: We identified a pattern of up-regulated IFNγ, IP-10/CXCL10, and IL-9 as predictive of advanced disease. When healthy neurons were exposed to these cytokines in proportions found in diseased brain, gene expression of mitochondrial electron transport chain complexes, including ATP synthase, was suppressed. In live cells, basal and maximal mitochondrial respiration were impaired following cytokine stimulation.

Conclusions: We identify a pattern of cytokine secretion predictive of progressing amyloid-β pathology in the 5xFAD mouse model of AD that reduces expression of mitochondrial electron transport complexes and impairs mitochondrial respiration in healthy neurons. We establish a mechanistic link between disease-specific immune cues and impaired neuronal metabolism, potentially causing neuronal vulnerability and susceptibility to degeneration in AD.

Supplementary information: The online version contains supplementary material available at 10.1007/s12195-023-00782-y.

引言:神经炎症和代谢功能障碍是阿尔茨海默病(AD)大脑的早期改变,被认为有助于疾病的发作和进展。蛋白质沉积引起的胶质细胞激活导致细胞因子分泌和大脑代谢的变化,这在AD患者中已经观察到。然而,这种免疫代谢反馈回路损伤神经元并导致神经退行性变的机制尚不清楚。方法:我们使用Luminex XMAP技术在疾病发展的里程碑时间点量化5xFAD AD小鼠模型中的海马细胞因子浓度。与野生型同窝出生的健康衰老相比,我们使用偏最小二乘回归来构建预测疾病进展的细胞因子特征。我们将疾病定义的细胞因子特征应用于野生型原代神经元培养,并使用NanoString nCounter系统测量基因表达的下游变化,使用海马细胞外通量活细胞分析仪测量线粒体功能。结果:我们确定了上调的IFNγ、IP-10/CXCL10和IL-9可预测晚期疾病。当健康神经元以患病大脑中发现的比例暴露于这些细胞因子时,包括ATP合酶在内的线粒体电子传递链复合物的基因表达受到抑制。在活细胞中,细胞因子刺激后,线粒体基本和最大呼吸受损。结论:我们在5xFAD AD小鼠模型中确定了一种细胞因子分泌模式,该模式可预测进展中的淀粉样蛋白-β病理,降低线粒体电子运输复合物的表达,并损害健康神经元的线粒体呼吸。我们在疾病特异性免疫线索和受损的神经元代谢之间建立了机制联系,这可能会导致AD中的神经元脆弱性和变性易感性。补充信息:在线版本包含补充材料,可访问10.1007/s12195-023-00782-y。
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引用次数: 0
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