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Zhang H, Ma Y, Wang Y, Niu L, Zou R, Zhang M, Liu H, Genin GM, Li A, Xu F. Rational Design of Soft-Hard Interfaces through Bioinspired Engineering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2204498. [PMID: 36228093 DOI: 10.1002/smll.202204498] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 09/19/2022] [Indexed: 06/16/2023]
Abstract
Soft-hard tissue interfaces in nature present a diversity of hierarchical transitions in composition and structure to address the challenge of stress concentrations that would otherwise arise at their interface. The translation of these into engineered materials holds promise for improved function of biomedical interfaces. Here, soft-hard tissue interfaces found in the body in health and disease, and the application of the diverse, functionally graded, and hierarchical structures that they present to bioinspired engineering materials are reviewed. A range of such bioinspired engineering materials and associated manufacturing technologies that are on the horizon in interfacial tissue engineering, hydrogel bioadhesion at the interfaces, and healthcare and medical devices are described.
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Affiliation(s)
- Hui Zhang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, P. R. China
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Yufei Ma
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Yijie Wang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, P. R. China
| | - Lin Niu
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, P. R. China
| | - Rui Zou
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, P. R. China
| | - Min Zhang
- State Key Laboratory of Military Stomatology, Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Hao Liu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Guy M Genin
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
- NSF Science and Technology Center for Engineering MechanoBiology, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Ang Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, P. R. China
| | - Feng Xu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, 710049, P. R. China
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CXCR4 as a novel target in immunology: moving away from typical antagonists. FUTURE DRUG DISCOVERY 2022; 4:FDD77. [PMID: 35875591 PMCID: PMC9298491 DOI: 10.4155/fdd-2022-0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/17/2022] [Indexed: 11/17/2022] Open
Abstract
CXCR4 has been a target of interest in drug discovery for numerous years. However, so far, most if not all studies focused on finding antagonists of CXCR4 function. Recent studies demonstrate that targeting a minor allosteric pocket of CXCR4 induces an immunomodulating effect in immune cells expressing CXCR4, connected to the TLR pathway. Compounds binding in this minor pocket seem to be functionally selective with inverse agonistic properties in selected GPCR signaling pathways (Gi activation), but additional signaling pathways are likely to be involved in the immunomodulating effects. In depth research into these CXCR4-targeted immunomodulators could lead to novel treatment options for (auto)-immune diseases.
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Zhou G, Wang Y, Gao S, Fu X, Cao Y, Peng Y, Zhuang J, Hu J, Shao A, Wang L. Potential Mechanisms and Perspectives in Ischemic Stroke Treatment Using Stem Cell Therapies. Front Cell Dev Biol 2021; 9:646927. [PMID: 33869200 PMCID: PMC8047216 DOI: 10.3389/fcell.2021.646927] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 03/05/2021] [Indexed: 12/12/2022] Open
Abstract
Ischemic stroke (IS) remains one of the major causes of death and disability due to the limited ability of central nervous system cells to regenerate and differentiate. Although several advances have been made in stroke therapies in the last decades, there are only a few approaches available to improve IS outcome. In the acute phase of IS, mechanical thrombectomy and the administration of tissue plasminogen activator have been widely used, while aspirin or clopidogrel represents the main therapy used in the subacute or chronic phase. However, in most cases, stroke patients fail to achieve satisfactory functional recovery under the treatments mentioned above. Recently, cell therapy, especially stem cell therapy, has been considered as a novel and potential therapeutic strategy to improve stroke outcome through mechanisms, including cell differentiation, cell replacement, immunomodulation, neural circuit reconstruction, and protective factor release. Different stem cell types, such as mesenchymal stem cells, marrow mononuclear cells, and neural stem cells, have also been considered for stroke therapy. In recent years, many clinical and preclinical studies on cell therapy have been carried out, and numerous results have shown that cell therapy has bright prospects in the treatment of stroke. However, some cell therapy issues are not yet fully understood, such as its optimal parameters including cell type choice, cell doses, and injection routes; therefore, a closer relationship between basic and clinical research is needed. In this review, the role of cell therapy in stroke treatment and its mechanisms was summarized, as well as the function of different stem cell types in stroke treatment and the clinical trials using stem cell therapy to cure stroke, to reveal future insights on stroke-related cell therapy, and to guide further studies.
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Affiliation(s)
- Guoyang Zhou
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yongjie Wang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Shiqi Gao
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Xiongjie Fu
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yang Cao
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yucong Peng
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Jianfeng Zhuang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Junwen Hu
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Anwen Shao
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Lin Wang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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Jiao Y, Liu YW, Chen WG, Liu J. Neuroregeneration and functional recovery after stroke: advancing neural stem cell therapy toward clinical application. Neural Regen Res 2021; 16:80-92. [PMID: 32788451 PMCID: PMC7818886 DOI: 10.4103/1673-5374.286955] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Stroke is a main cause of death and disability worldwide. The ability of the brain to self-repair in the acute and chronic phases after stroke is minimal; however, promising stem cell-based interventions are emerging that may give substantial and possibly complete recovery of brain function after stroke. Many animal models and clinical trials have demonstrated that neural stem cells (NSCs) in the central nervous system can orchestrate neurological repair through nerve regeneration, neuron polarization, axon pruning, neurite outgrowth, repair of myelin, and remodeling of the microenvironment and brain networks. Compared with other types of stem cells, NSCs have unique advantages in cell replacement, paracrine action, inflammatory regulation and neuroprotection. Our review summarizes NSC origins, characteristics, therapeutic mechanisms and repair processes, then highlights current research findings and clinical evidence for NSC therapy. These results may be helpful to inform the direction of future stroke research and to guide clinical decision-making.
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Affiliation(s)
- Yang Jiao
- Stem Cell Clinical Research Center, National Joint Engineering Laboratory, Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University; Dalian Innovation Institute of Stem Cells and Precision Medicine, Dalian, Liaoning Province, China
| | - Yu-Wan Liu
- Stem Cell Clinical Research Center, National Joint Engineering Laboratory, Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China
| | - Wei-Gong Chen
- Stem Cell Clinical Research Center, National Joint Engineering Laboratory, Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University; Dalian Innovation Institute of Stem Cells and Precision Medicine, Dalian, Liaoning Province, China
| | - Jing Liu
- Stem Cell Clinical Research Center, National Joint Engineering Laboratory, Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University; Dalian Innovation Institute of Stem Cells and Precision Medicine, Dalian, Liaoning Province, China
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Liu B, Ma Z, Yang J, Gao G, Liu H. A Concentration Gradients Tunable Generator with Adjustable Position of the Acoustically Oscillating Bubbles. MICROMACHINES 2020; 11:mi11090827. [PMID: 32878158 PMCID: PMC7570149 DOI: 10.3390/mi11090827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 08/26/2020] [Accepted: 08/29/2020] [Indexed: 01/29/2023]
Abstract
It is essential to control concentration gradients at specific locations for many biochemical experiments. This paper proposes a tunable concentration gradient generator actuated by acoustically oscillating bubbles trapped in the bubble channels using a controllable position based on the gas permeability of polydimethylsiloxane (PDMS). The gradient generator consists of a glass substrate, a PDMS chip, and a piezoelectric transducer. When the trapped bubbles are activated by acoustic waves, the solution near the gas–liquid interface is mixed. The volume of the bubbles and the position of the gas–liquid interface are regulated through the permeability of the PDMS wall. The tunable concentration gradient can be realized by changing the numbers and positions of the bubbles that enable the mixing of fluids in the main channel, and the amplitude of the applied voltage. This new device is easy to fabricate, responsive, and biocompatible, and therefore has great application prospects. In particular, it is suitable for biological research with high requirements for temporal controllability.
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Affiliation(s)
- Bendong Liu
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; (Z.M.); (J.Y.); (G.G.); (H.L.)
- Correspondence: ; Tel.: +86-010-67396187
| | - Zhigao Ma
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; (Z.M.); (J.Y.); (G.G.); (H.L.)
| | - Jiahui Yang
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; (Z.M.); (J.Y.); (G.G.); (H.L.)
- Electrical and Mechanical College, Beijing Vocational College of Agriculture, Beijing 102208, China
| | - Guohua Gao
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; (Z.M.); (J.Y.); (G.G.); (H.L.)
| | - Haibin Liu
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; (Z.M.); (J.Y.); (G.G.); (H.L.)
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Peña JS, Vazquez M. VEGF Upregulates EGFR Expression to Stimulate Chemotactic Behaviors in the rMC-1 Model of Müller Glia. Brain Sci 2020; 10:E330. [PMID: 32485834 PMCID: PMC7348795 DOI: 10.3390/brainsci10060330] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 03/28/2020] [Accepted: 05/27/2020] [Indexed: 12/14/2022] Open
Abstract
Progressive vision loss in adults has become increasingly prevalent worldwide due to retinopathies associated with aging, genetics, and epigenetic factors that damage the retinal microvasculature. Insufficient supply of oxygen and/or nutrients upregulates factors such as vascular endothelial growth factor (VEGF) and epidermal growth factor (EGF), which can induce abnormal angiogenesis and damage the structural arrangement of the retinal blood barrier (BRB). Müller glia (MG) regulate the diffusion of essential compounds across the BRB and respond to retinal insults via reactive gliosis, which includes cell hypertrophy, migration, and/or proliferation near areas of elevated VEGF concentration. Increasing concentrations of exogenous VEGF, upregulated by retinal pigmented epithelium cells, and endogenous epidermal growth factor receptor (EGF-R) stimulation in MG, implicated in MG proliferative and migratory behavior, often lead to progressive and permanent vision loss. Our project examined the chemotactic responses of the rMC-1 cell line, a mammalian MG model, toward VEGF and EGF signaling fields in transwell assays, and within respective concentration gradient fields produced in the glia line (gLL) microfluidic system previously described by our group. rMC-1 receptor expression in defined ligand fields was also evaluated using quantitative polymerase chain reaction (qPCR) and immunocytochemical staining. Results illustrate dramatic increases in rMC-1 chemotactic responses towards EGF gradient fields after pre-treatment with VEGF. In addition, qPCR illustrated significant upregulation of EGF-R upon VEGF pre-treatment, which was higher than that induced by its cognate ligand, EGF. These results suggest interplay of molecular pathways between VEGF and EGF-R that have remained understudied in MG but are significant to the development of effective anti-VEGF treatments needed for a variety of retinopathies.
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Affiliation(s)
| | - Maribel Vazquez
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA;
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Berendsen JTW, Kruit SA, Atak N, Willink E, Segerink LI. Flow-Free Microfluidic Device for Quantifying Chemotaxis in Spermatozoa. Anal Chem 2020; 92:3302-3306. [PMID: 31994387 PMCID: PMC7031847 DOI: 10.1021/acs.analchem.9b05183] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Current male fertility diagnosis tests focus on assessing the quality of semen samples by studying the concentration, total volume, and motility of spermatozoa. However, other characteristics such as the chemotactic ability of a spermatozoon might influence the chance of fertilization. Here we describe a simple, easy to fabricate and handle, flow-free microfluidic chip to test the chemotactic response of spermatozoa made out of a hybrid hydrogel (8% gelatin/1% agarose). A chemotaxis experiment with 1 μM progesterone was performed that significantly demonstrated that boar spermatozoa are attracted by a progesterone gradient.
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Affiliation(s)
- Johanna T W Berendsen
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Technology and Technical Medicine , University of Twente , 7500 AE Enschede , The Netherlands
| | - Stella A Kruit
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Technology and Technical Medicine , University of Twente , 7500 AE Enschede , The Netherlands
| | - Nihan Atak
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Technology and Technical Medicine , University of Twente , 7500 AE Enschede , The Netherlands
| | - Ellen Willink
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Technology and Technical Medicine , University of Twente , 7500 AE Enschede , The Netherlands
| | - Loes I Segerink
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Technology and Technical Medicine , University of Twente , 7500 AE Enschede , The Netherlands
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Dravid A, Parittotokkaporn S, Aqrawe Z, O’Carroll SJ, Svirskis D. Determining Neurotrophin Gradients in Vitro To Direct Axonal Outgrowth Following Spinal Cord Injury. ACS Chem Neurosci 2020; 11:121-132. [PMID: 31825204 DOI: 10.1021/acschemneuro.9b00565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A spinal cord injury can damage neuronal connections required for both motor and sensory function. Barriers to regeneration within the central nervous system, including an absence of neurotrophic stimulation, impair the ability of injured neurons to reestablish their original circuitry. Exogenous neurotrophin administration has been shown to promote axonal regeneration and outgrowth following injury. The neurotrophins possess chemotrophic properties that guide axons toward the region of highest concentration. These growth factors have demonstrated potential to be used as a therapeutic intervention for orienting axonal growth beyond the injury lesion, toward denervated targets. However, the success of this approach is dependent on the appropriate spatiotemporal distribution of these molecules to ensure detection and navigation by the axonal growth cone. A number of in vitro gradient-based assays have been employed to investigate axonal response to neurotrophic gradients. Such platforms have helped elucidate the potential of applying a concentration gradient of neurotrophins to promote directed axonal regeneration toward a functionally significant target. Here, we review these techniques and the principles of gradient detection in axonal guidance, with particular focus on the use of neurotrophins to orient the trajectory of regenerating axons.
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Affiliation(s)
- Anusha Dravid
- School of Pharmacy, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Sam Parittotokkaporn
- Department of Anatomy and Medical Imaging, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Zaid Aqrawe
- School of Pharmacy, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
- Department of Anatomy and Medical Imaging, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Simon J. O’Carroll
- Department of Anatomy and Medical Imaging, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Darren Svirskis
- School of Pharmacy, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
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Kim JA, Hong S, Rhee WJ. Microfluidic three-dimensional cell culture of stem cells for high-throughput analysis. World J Stem Cells 2019; 11:803-816. [PMID: 31693013 PMCID: PMC6828593 DOI: 10.4252/wjsc.v11.i10.803] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 07/02/2019] [Accepted: 07/29/2019] [Indexed: 02/06/2023] Open
Abstract
Although the recent advances in stem cell engineering have gained a great deal of attention due to their high potential in clinical research, the applicability of stem cells for preclinical screening in the drug discovery process is still challenging due to difficulties in controlling the stem cell microenvironment and the limited availability of high-throughput systems. Recently, researchers have been actively developing and evaluating three-dimensional (3D) cell culture-based platforms using microfluidic technologies, such as organ-on-a-chip and organoid-on-a-chip platforms, and they have achieved promising breakthroughs in stem cell engineering. In this review, we start with a comprehensive discussion on the importance of microfluidic 3D cell culture techniques in stem cell research and their technical strategies in the field of drug discovery. In a subsequent section, we discuss microfluidic 3D cell culture techniques for high-throughput analysis for use in stem cell research. In addition, some potential and practical applications of organ-on-a-chip or organoid-on-a-chip platforms using stem cells as drug screening and disease models are highlighted.
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Affiliation(s)
- Jeong Ah Kim
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Cheongju 28119, South Korea
- Department of Bio-Analytical Science, University of Science and Technology, Daejeon 34113, South Korea
| | - Soohyun Hong
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Cheongju 28119, South Korea
- Program in Biomicro System Technology, Korea University, Seoul 02841, South Korea
| | - Won Jong Rhee
- Division of Bioengineering, Incheon National University, Incheon 22012, South Korea
- Department of Bioengineering and Nano-Bioengineering, Incheon National University, Incheon 22012, South Korea
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Hwang HM, Ku RY, Hashimoto-Torii K. Prenatal Environment That Affects Neuronal Migration. Front Cell Dev Biol 2019; 7:138. [PMID: 31380373 PMCID: PMC6652208 DOI: 10.3389/fcell.2019.00138] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 07/08/2019] [Indexed: 11/22/2022] Open
Abstract
Migration of neurons starts in the prenatal period and continues into infancy. This developmental process is crucial for forming a proper neuronal network, and the disturbance of this process results in dysfunction of the brain such as epilepsy. Prenatal exposure to environmental stress, including alcohol, drugs, and inflammation, disrupts neuronal migration and causes neuronal migration disorders (NMDs). In this review, we summarize recent findings on this topic and specifically focusing on two different modes of migration, radial, and tangential migration during cortical development. The shared mechanisms underlying the NMDs are discussed by comparing the molecular changes in impaired neuronal migration under exposure to different types of prenatal environmental stress.
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Affiliation(s)
- Hye M Hwang
- Center for Neuroscience Research, Children's National Medical Center, The Children's Research Institute, Washington, DC, United States.,The Institute for Biomedical Sciences, School of Medicine and Health Sciences, The George Washington University, Washington, DC, United States
| | - Ray Y Ku
- Center for Neuroscience Research, Children's National Medical Center, The Children's Research Institute, Washington, DC, United States
| | - Kazue Hashimoto-Torii
- Center for Neuroscience Research, Children's National Medical Center, The Children's Research Institute, Washington, DC, United States.,Departments of Pediatrics, and Pharmacology & Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, DC, United States
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Chen Z, Luo X, Zhao X, Yang M, Wen C. Label-free cell sorting strategies via biophysical and biochemical gradients. J Orthop Translat 2019; 17:55-63. [PMID: 31194093 PMCID: PMC6551360 DOI: 10.1016/j.jot.2019.01.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/23/2019] [Accepted: 01/28/2019] [Indexed: 01/08/2023] Open
Abstract
Isolating active mesenchymal stem cells from a heterogeneous population is an essential step that determines the efficacy of stem cell therapy such as for osteoarthritis. Nowadays, the gold standard of cell sorting, fluorescence-activated cell sorting, relies on labelling surface markers via antibody-antigen reaction. However, sorting stem cells with high stemness usually requires the labelling of multiple biomarkers. Moreover, the labelling process is costly, and the high operating pressure is harmful to cell functionality and viability. Although label-free cell sorting, based on physical characteristics, has gained increasing interest in the past decades, it has not shown the ability to eliminate stem cells with low stemness. Cell motility, as a novel sorting marker, is hence proposed for label-free sorting active stem cells. Accumulating evidence has demonstrated the feasibility in manipulating directional cell migration through patterning the biophysical, biochemical or both gradients of the extracellular matrix. However, applying those findings to label-free cell sorting has not been well discussed and studied. This review thus first provides a brief overview about the effect of biophysical and biochemical gradients of the extracellular matrix on cell migration. State-of-the-art fabrication techniques for generating such gradients of hydrogels are then introduced. Among current research, the authors suggest that hydrogels with dual-gradients of biochemistry and biophysics are potential tools for accurate label-free cell sorting with satisfactory selectivity and efficiency. TRANSLATIONAL POTENTIAL OF THIS ARTICLE The reviewed label-free cell sorting approaches enable us to isolate active cell for cytotherapy. The proposed system can be further modified for single-cell analysis and drug screening.
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Affiliation(s)
| | | | | | | | - Chunyi Wen
- Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, China
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Zhang G, Guo X, Chen L, Li B, Gu B, Wang H, Wu G, Kong J, Chen W, Yu Y. Interferon-γ Promotes Neuronal Repair by Transplanted Neural Stem Cells in Ischemic Rats. Stem Cells Dev 2018; 27:355-366. [PMID: 29298609 DOI: 10.1089/scd.2017.0225] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Ischemic stroke represents the leading cause of adult neurological disability, with no effective therapeutic strategy. Stem cell transplantation promises a new promising for treating stroke, through cell replacement and cytokine paracrine. However, due to the effect of hostile immune microenvironment, the survival and differentiation of stem cells are limited in vivo. Furthermore, the delayed inflammatory response to stroke induced secondary neurological injury. IFN-γ as pro-inflammatory cytokine has the potential to protect stem cell population during inflammatory response, as well as stimulates neurogenesis of stem cells. The purpose of this study was to investigate whether co-injection of neural stem cells and IFN-γ can improve therapeutic outcomes in ischemic stroke model. In this study, we found that IFN-γ did not interfere with the proliferation of neural stem cells (NSCs) in vitro and induced levels of subsequent neuronal differentiation significantly superior to those of other four cytokines BDNF, VEGF, TGF-β, and IGF-1. Co-delivery of IFN-γ (concentration: 50 ng) enhanced the effectiveness of NSC transplantation therapy in ischemic rats. And combined IFN-γ treatment significantly increased neurogenesis in vivo, with more BrdU/DCX dual-positive cells found in ischemic areas. Moreover, co-treatment with IFN-γ and NSCs exerted additional neurological benefits compared with NSC transplantation alone. In conclusion, low concentration of IFN-γ can promote the functions of transplanted NSCs and facilitate their ability of neurological repair. Thus, our findings suggest that co-delivery of NSCs and IFN-γ without genetic modification may be an effective, simple, and novel approach for the treatment of ischemic stroke.
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Affiliation(s)
- Guilong Zhang
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Xiaoyuan Guo
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Lukui Chen
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Bingqian Li
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Bin Gu
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Hong Wang
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Guojian Wu
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Jun Kong
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Wanghao Chen
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Yongbo Yu
- Department of Neurosurgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
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Li ZC, Jia YP, Wang Y, Qi JL, Han XP. Effects of dexmedetomidine post‑treatment on BDNF and VEGF expression following cerebral ischemia/reperfusion injury in rats. Mol Med Rep 2018; 17:6033-6037. [PMID: 29436655 DOI: 10.3892/mmr.2018.8597] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 10/25/2017] [Indexed: 11/05/2022] Open
Abstract
Brain‑derived neurotrophic factor (BDNF) and vascular endothelial growth factor (VEGF) serves a significant role in neural protection by activating the phosphatidylinositol 3‑kinase (PI3K)/Akt signaling pathway, which also was associated with the neuroprotective the treatment with dexmedetomidine (DEX). The present study aimed to further explore whether treatment with DEX post‑IR increased the expression level of BDNF and VEGF in the rat brain. A total of 30 healthy, clean male Wistar rats were randomly divided into 3 experimental groups: Control group, ischemia/reperfusion (I/R) group and DEX treatment group. Subsequently, BDNF and VEGF mRNA and protein expression levels were analyzed. The results indicated that the mRNA expression levels of BDNF and VEGF were higher in the I/R and DEX groups compared with expression levels in the Control group at 6 h and 1 day post‑treatment; the levels of BNDF mRNA expression were higher in the DEX group compared with the I/R group. The levels of BDNF and VEGF protein expression in the I/R and DEX groups were also significantly higher compared with those in the Control group. I/R surgery significantly increased the expression of BDNF and VEGF protein DEX group at 6 h, day 1 and day 3 compared with expression levels in the I/R group. Results from the present study indicated that post‑surgical treatment with DEX may increase the expression of BDNF and VEGF following I/R, which may serve a role in nerve protection.
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Affiliation(s)
- Zheng-Chen Li
- Department of Anesthesia, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
| | - Ying-Ping Jia
- Department of Anesthesia, Zhengzhou Children's Hospital, Zhengzhou, Henan 450053, P.R. China
| | - Yuan Wang
- Department of Anesthesia, Zhengzhou Children's Hospital, Zhengzhou, Henan 450053, P.R. China
| | - Jin-Lian Qi
- Department of Anesthesia, Zhengzhou Children's Hospital, Zhengzhou, Henan 450053, P.R. China
| | - Xue-Ping Han
- Department of Anesthesia, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
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Osaki T, Shin Y, Sivathanu V, Campisi M, Kamm RD. In Vitro Microfluidic Models for Neurodegenerative Disorders. Adv Healthc Mater 2018; 7. [PMID: 28881425 DOI: 10.1002/adhm.201700489] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 07/18/2017] [Indexed: 01/09/2023]
Abstract
Microfluidic devices enable novel means of emulating neurodegenerative disease pathophysiology in vitro. These organ-on-a-chip systems can potentially reduce animal testing and substitute (or augment) simple 2D culture systems. Reconstituting critical features of neurodegenerative diseases in a biomimetic system using microfluidics can thereby accelerate drug discovery and improve our understanding of the mechanisms of several currently incurable diseases. This review describes latest advances in modeling neurodegenerative diseases in the central nervous system and the peripheral nervous system. First, this study summarizes fundamental advantages of microfluidic devices in the creation of compartmentalized cell culture microenvironments for the co-culture of neurons, glial cells, endothelial cells, and skeletal muscle cells and in their recapitulation of spatiotemporal chemical gradients and mechanical microenvironments. Then, this reviews neurodegenerative-disease-on-a-chip models focusing on Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis. Finally, this study discusses about current drawbacks of these models and strategies that may overcome them. These organ-on-chip technologies can be useful to be the first line of testing line in drug development and toxicology studies, which can contribute significantly to minimize the phase of animal testing steps.
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Affiliation(s)
- Tatsuya Osaki
- Department of Mechanical EngineeringMassachusetts Institutes of Technology 500 Technology Square MIT Building, Room NE47‐321 Cambridge MA 02139 USA
| | - Yoojin Shin
- Department of Mechanical EngineeringMassachusetts Institutes of Technology 500 Technology Square MIT Building, Room NE47‐321 Cambridge MA 02139 USA
| | - Vivek Sivathanu
- Department of Mechanical EngineeringMassachusetts Institutes of Technology 500 Technology Square MIT Building, Room NE47‐321 Cambridge MA 02139 USA
| | - Marco Campisi
- Department of Mechanical and Aerospace EngineeringPolitecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino Italy
| | - Roger D. Kamm
- Department of Mechanical EngineeringMassachusetts Institutes of Technology 500 Technology Square MIT Building, Room NE47‐321 Cambridge MA 02139 USA
- Department of Biological EngineeringMassachusetts Institutes of Technology 500 Technology Square, MIT Building, Room NE47‐321 Cambridge MA 02139 USA
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15
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Abstract
In mammals, recent studies have demonstrated that the brain, the hypothalamus in particular, is a key bidirectional integrator of humoral and neural information from peripheral tissues, thus influencing ageing both in the brain and at the 'systemic' level. CNS decline drives the progressive impairment of cognitive, social and physical abilities, and the mechanisms underlying CNS regulation of the ageing process, such as microglia-neuron networks and the activities of sirtuins, a class of NAD+-dependent deacylases, are beginning to be understood. Such mechanisms are potential targets for the prevention or treatment of age-associated dysfunction and for the extension of a healthy lifespan.
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16
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Chu T, Shields LBE, Zhang YP, Feng SQ, Shields CB, Cai J. CXCL12/CXCR4/CXCR7 Chemokine Axis in the Central Nervous System: Therapeutic Targets for Remyelination in Demyelinating Diseases. Neuroscientist 2017; 23:627-648. [PMID: 29283028 DOI: 10.1177/1073858416685690] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The chemokine CXCL12 plays a vital role in regulating the development of the central nervous system (CNS) by binding to its receptors CXCR4 and CXCR7. Recent studies reported that the CXCL12/CXCR4/CXCR7 axis regulates both embryonic and adult oligodendrocyte precursor cells (OPCs) in their proliferation, migration, and differentiation. The changes in the expression and distribution of CXCL12 and its receptors are tightly associated with the pathological process of demyelination in multiple sclerosis (MS), suggesting that modulating the CXCL12/CXCR4/CXCR7 axis may benefit myelin repair by enhancing OPC recruitment and differentiation. This review aims to integrate the current findings of the CXCL12/CXCR4/CXCR7 signaling pathway in the CNS and to highlight its role in oligodendrocyte development and demyelinating diseases. Furthermore, this review provides potential therapeutic strategies for myelin repair by analyzing the relevance between the pathological changes and the regulatory roles of CXCL12/CXCR4/CXCR7 during MS.
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Affiliation(s)
- Tianci Chu
- 1 Department of Pediatrics, University of Louisville School of Medicine, Louisville, KY, USA
| | - Lisa B E Shields
- 2 Norton Neuroscience Institute, Norton Healthcare, Louisville, KY, USA
| | - Yi Ping Zhang
- 2 Norton Neuroscience Institute, Norton Healthcare, Louisville, KY, USA
| | - Shi-Qing Feng
- 3 Department of Orthopedics, General Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | | | - Jun Cai
- 1 Department of Pediatrics, University of Louisville School of Medicine, Louisville, KY, USA.,4 Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, Louisville, KY, USA
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17
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Yu S, Gao Y, Mei X, Ren T, Liang S, Mao Z, Gao C. Preparation of an Arg-Glu-Asp-Val Peptide Density Gradient on Hyaluronic Acid-Coated Poly(ε-caprolactone) Film and Its Influence on the Selective Adhesion and Directional Migration of Endothelial Cells. ACS APPLIED MATERIALS & INTERFACES 2016; 8:29280-29288. [PMID: 27723284 DOI: 10.1021/acsami.6b09375] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Selective adhesion and migration of endothelial cells (ECs) over smooth muscle cells (SMCs) is very important in the rapid endothelialization of blood-contacting implants to prevent vascular restenosis. In this study, a uniform cell-resistant layer of methacrylate-functionalized hyaluronic acid (HA) was first immobilized on a poly(ε-caprolactone) (PCL) film via polydopamine coupling. Then, a density gradient of thiol-functionalized Arg-Glu-Asp-Val (REDV) peptide was prepared on the HA layer via thiol-ene click chemistry and the continuous injection method. The REDV gradient selectively enhanced EC adhesion and preferential directional migration toward the region of higher REDV density, reaching 86% directionality in the middle of the gradient. The migration rate of ECs was also significantly enhanced twofold compared with that on tissue culture polystyrene (TCPS). In contrast, the gradient significantly weakened the adhesion of SMCs to 25% of that on TCPS but had no obvious impact on the migration rate and directionality. Successful modulation of the selective adhesion and directional migration of ECs over SMCs on biodegradable polymers serves as an important step toward practical applications for guided tissue regeneration.
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Affiliation(s)
- Shan Yu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | - Ying Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | - Xu Mei
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | - Tanchen Ren
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | - Su Liang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | - Zhengwei Mao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | - Changyou Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou 310027, China
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Li X, Li M, Sun J, Zhuang Y, Shi J, Guan D, Chen Y, Dai J. Radially Aligned Electrospun Fibers with Continuous Gradient of SDF1α for the Guidance of Neural Stem Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:5009-5018. [PMID: 27442189 DOI: 10.1002/smll.201601285] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/10/2016] [Indexed: 06/06/2023]
Abstract
Repair of spinal cord injury will require enhanced recruitment of endogenous neural stem cells (NSCs) from the central canal region to the lesion site to reestablish neural connectivity. The strategy toward this goal is to provide directional cues, e.g., alignment topography and biological gradients from the rostral and caudal ends toward the center. This study demonstrates a facile method for fabrication of continuous gradients of stromal-cell-derived factor-1α (SDF1α) embedded in the radially aligned electrospun collagen/poly (ε-caprolactone) mats. Gradients can be readily produced in a controllable and reproducible fashion by adjusting the collection time and collector size during electrospinning. To get a long-term gradient, the SDF1α is fused with a unique peptide of collagen-binding domain (CBD), which can bind to collagen specifically. Aligned CBD-SDF1α gradients show stable, sustained, and gradual release during 7 d. Further, the effect of aligned CBD-SDF1α gradients on the guidance of NSCs is investigated. It is found that the CBD-SDF1α gradient scaffolds direct and enhance NSC migration from the periphery to the center along the aligned electrospun fibers. Taken together, the tubular conduits based on radially aligned electrospun fibers with continuous SDF1α gradient show great potential for guiding nerve regeneration.
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Affiliation(s)
- Xiaoran Li
- Key Laboratory for Nano-Bio Interface Research, Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China
| | - Mengyuan Li
- Key Laboratory for Nano-Bio Interface Research, Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China
- School of Life Sciences, Shanghai University, Shanghai, 200444, China
| | - Jie Sun
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China
| | - Yan Zhuang
- Key Laboratory for Nano-Bio Interface Research, Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China
| | - Jiajia Shi
- Key Laboratory for Nano-Bio Interface Research, Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China
- School of Life Sciences, Shanghai University, Shanghai, 200444, China
| | - Dongwei Guan
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China
| | - Yanyan Chen
- Key Laboratory for Nano-Bio Interface Research, Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China
| | - Jianwu Dai
- Key Laboratory for Nano-Bio Interface Research, Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
- Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100080, China.
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19
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Yoon D, Kim H, Lee E, Park MH, Chung S, Jeon H, Ahn CH, Lee K. Study on chemotaxis and chemokinesis of bone marrow-derived mesenchymal stem cells in hydrogel-based 3D microfluidic devices. Biomater Res 2016; 20:25. [PMID: 27489724 PMCID: PMC4971648 DOI: 10.1186/s40824-016-0070-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 07/15/2016] [Indexed: 12/23/2022] Open
Abstract
Background Controlling the fate of mesenchymal stems cells (MSCs) including proliferation, migration and differentiation has recently been studied by many researchers in the tissue engineering field. Especially, recruitment of stem cells to injury sites is the first and crucial step in tissue regeneration. Although significant progress has been made in the chemotactic migration of MSCs, MSC migration in three dimensional environments remains largely unknown. We developed a 3D hydrogel-based microfluidic-device to study the migration behavior of human MSCs in the presence of stromal-cell derived factor-1α (SDF-1α), interleukin 8 (IL-8) and Substance P (SP) which have been utilized as chemoattractant candidates of human mesenchymal stem cells (hMSCs). Results We systematically investigated the chemotactic migration behaviors of hMSCs and their responses to SDF-1α, IL-8, and SP. SDF-1α was shown to be the most fascinating chemoattractant candidate among those factors at a certain time point. We also found that each chemokine showed different chemoattractant abilities according to their concentration. In the case of SP, this factor showed chemokinesis not chemotaxis. Especially at a 7–8 × 10−8 M concentration range, the chemokinesis ability driven by SP was further increased. The data suggest that some factors at the optimal concentration exhibit chemokinesis or chemotaxis in a 3D hydrogel-based microfluidic device. Conclusion In this study on chemotaxis and chemokinesis of hMSCs, the system parameters such as chemokine concentration, system stability, and 2D or 3D microenvironment are critically important to obtain meaningful results.
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Affiliation(s)
- Dayoung Yoon
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea ; Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Hyerim Kim
- Program in Nanoscience and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea
| | - Eojin Lee
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Min Hee Park
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Seok Chung
- School of Mechanical Engineering, Korea University, Seoul, Republic of Korea
| | - Hojeong Jeon
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Cheol-Hee Ahn
- Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Kangwon Lee
- Program in Nanoscience and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea ; Advanced Institutes of Convergence Technology, Gyeonggi-do, Republic of Korea
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20
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Karimi M, Bahrami S, Mirshekari H, Basri SMM, Nik AB, Aref AR, Akbari M, Hamblin MR. Microfluidic systems for stem cell-based neural tissue engineering. LAB ON A CHIP 2016; 16:2551-71. [PMID: 27296463 PMCID: PMC4935609 DOI: 10.1039/c6lc00489j] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Neural tissue engineering aims at developing novel approaches for the treatment of diseases of the nervous system, by providing a permissive environment for the growth and differentiation of neural cells. Three-dimensional (3D) cell culture systems provide a closer biomimetic environment, and promote better cell differentiation and improved cell function, than could be achieved by conventional two-dimensional (2D) culture systems. With the recent advances in the discovery and introduction of different types of stem cells for tissue engineering, microfluidic platforms have provided an improved microenvironment for the 3D-culture of stem cells. Microfluidic systems can provide more precise control over the spatiotemporal distribution of chemical and physical cues at the cellular level compared to traditional systems. Various microsystems have been designed and fabricated for the purpose of neural tissue engineering. Enhanced neural migration and differentiation, and monitoring of these processes, as well as understanding the behavior of stem cells and their microenvironment have been obtained through application of different microfluidic-based stem cell culture and tissue engineering techniques. As the technology advances it may be possible to construct a "brain-on-a-chip". In this review, we describe the basics of stem cells and tissue engineering as well as microfluidics-based tissue engineering approaches. We review recent testing of various microfluidic approaches for stem cell-based neural tissue engineering.
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Affiliation(s)
- Mahdi Karimi
- Department of Medical Nanotechnology, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Sajad Bahrami
- Department of Medical Nanotechnology, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran. and Nanomedicine Research Association (NRA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Hamed Mirshekari
- Advanced Nanobiotechnology and Nanomedicine Research Group (ANNRG), Iran University of Medical Sciences, Tehran, Iran.
| | - Seyed Masoud Moosavi Basri
- Bioenvironmental Research Center, Sharif University of Technology, Tehran, Iran. and Civil & Environmental Engineering Department, Shahid Beheshti University, Tehran, Iran
| | - Amirala Bakhshian Nik
- Department of Biomedical Engineering, Faculty of New Sciences and Technologies, University of Tehran, Iran.
| | - Amir R Aref
- Department of Cancer Biology, Center for Cancer Systems Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA and Department of Genetics, Harvard Medical School, Boston, MA 02215, USA.
| | - Mohsen Akbari
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02215, USA. and Laboratory for Innovations in MicroEngineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC, Canada
| | - Michael R Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA. and Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA and Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA
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21
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22
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Abstract
The underlying physical properties of microfluidic tools have led to new biological insights through the development of microsystems that can manipulate, mimic and measure biology at a resolution that has not been possible with macroscale tools. Microsystems readily handle sub-microlitre volumes, precisely route predictable laminar fluid flows and match both perturbations and measurements to the length scales and timescales of biological systems. The advent of fabrication techniques that do not require highly specialized engineering facilities is fuelling the broad dissemination of microfluidic systems and their adaptation to specific biological questions. We describe how our understanding of molecular and cell biology is being and will continue to be advanced by precision microfluidic approaches and posit that microfluidic tools - in conjunction with advanced imaging, bioinformatics and molecular biology approaches - will transform biology into a precision science.
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23
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Integrative Utilization of Microenvironments, Biomaterials and Computational Techniques for Advanced Tissue Engineering. J Biotechnol 2015; 212:71-89. [DOI: 10.1016/j.jbiotec.2015.08.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Revised: 08/02/2015] [Accepted: 08/11/2015] [Indexed: 01/13/2023]
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Wostradowski T, Gudi V, Pul R, Gingele S, Lindquist JA, Stangel M, Lindquist S. Effect of interferon-β1b on CXCR4-dependent chemotaxis in T cells from multiple sclerosis patients. Clin Exp Immunol 2015. [PMID: 26212126 DOI: 10.1111/cei.12689] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Multiple sclerosis (MS) is an inflammatory, demyelinating and neurodegenerative disease triggered by infiltration of activated T cells into the central nervous system. Interferon (IFN)-β is an established, safe and effective treatment for patients with relapsing-remitting MS (RRMS). The cytokine can inhibit leucocyte infiltration into the central nervous system; however, little is known about the precise molecular mechanisms. Previously, in vitro application of IFN-β1b was shown to reduce CXCL12/CXCR4-mediated monocyte migration. Here, we analysed the effects of IFN-β1b on CXCR4-dependent T cell function. In vitro exposure to IFN-β1b (1000 U/ml) for 20 h reduced CXCR4-dependent chemotaxis of primary human T cells from healthy individuals and patients with RRMS. Investigating the IFN-β1b/CXCR4 signalling pathways, we found no difference in phosphorylation of ZAP70, ERK1/2 and AKT despite an early induction of the negative regulator of G-protein signalling, RGS1 by IFN-β1b. However, CXCR4 surface expression was reduced. Quantitative real time-PCR revealed a similar reduction in CXCR4-mRNA, and the requirement of several hours' exposure to IFN-β1b supports a transcriptional regulation. Interestingly, T cells from MS patients showed a lower CXCR4 expression than T cells from healthy controls, which was not reduced further in patients under IFN-β1b therapy. Furthermore, we observed no change in CXCL12-dependent chemotaxis in RRMS patients. Our results demonstrate clearly that IFN-β1b can impair the functional response to CXCR4 by down-regulating its expression, but also points to the complex in vivo effects of IFN-β1b therapy.
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Affiliation(s)
- T Wostradowski
- Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hannover Medical School, Hannover, Germany.,Center for Systems Neuroscience, Hannover, Germany
| | - V Gudi
- Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hannover Medical School, Hannover, Germany
| | - R Pul
- Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hannover Medical School, Hannover, Germany
| | - S Gingele
- Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hannover Medical School, Hannover, Germany
| | - J A Lindquist
- Department of Nephrology, Hypertension, Diabetes and Endocrinology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.,Institute for Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - M Stangel
- Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hannover Medical School, Hannover, Germany.,Center for Systems Neuroscience, Hannover, Germany
| | - S Lindquist
- Clinical Neuroimmunology and Neurochemistry, Department of Neurology, Hannover Medical School, Hannover, Germany.,Department of Neurochemistry and Molecular Biology, Leibniz-Institute for Neurobiology, and Neurological Rehabilitation Centre, MEDIAN Kliniken, Magdeburg, Germany
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25
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Li X, Liang H, Sun J, Zhuang Y, Xu B, Dai J. Electrospun Collagen Fibers with Spatial Patterning of SDF1α for the Guidance of Neural Stem Cells. Adv Healthc Mater 2015; 4:1869-76. [PMID: 26120820 DOI: 10.1002/adhm.201500271] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 05/30/2015] [Indexed: 01/06/2023]
Abstract
Producing gradients of biological cues into nerve conduits is crucial for nerve guidance and regeneration. Herein, the fabrication of gradients of stromal cell-derived factor-1α (SDF1α) on electrospun collagen mats is reported using an electrohydrodynamic jet printing technique. The fabrication of various SDF1α gradated patterns on collagen fibrous mats is successfully demonstrated including shallow continuous gradient, steep continuous gradient, and step gradient by controlling the processing parameters. The SDF1α graded collagen scaffolds show a long-term stable gradient, as SDF1α is fused with a unique peptide of collagen binding domain (CBD), and CBD-SDF1α can specifically bind to the collagen mat. Such graded scaffolds exhibit sustained release of SDF1α. Further examination of neural stem cell (NSC) response to the CBD-SDF1α gradients with various patterns show that the NSCs can sense the CBD-SDF1α gradients, display a polarized morphology, and tend to migrate toward the region with a higher CBD-SDF1α content. The collagen mats with CBD-SDF1α gradients guide gradual distribution of NSCs, and NSC-differentiated neurons and astrocytes after seeding for 1 and 7 d. This new class of CBD-SDF1α gradient scaffolds can potentially be employed for guided nerve regeneration.
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Affiliation(s)
- Xiaoran Li
- Key Laboratory for Nano-Bio Interface Research; Division of Nanobiomedicine; Suzhou Institute of Nano-Tech and Nano-Bionics; Chinese Academy of Sciences; Suzhou 215123 China
| | - Hui Liang
- Key Laboratory for Nano-Bio Interface Research; Division of Nanobiomedicine; Suzhou Institute of Nano-Tech and Nano-Bionics; Chinese Academy of Sciences; Suzhou 215123 China
| | - Jie Sun
- Institute of Combined Injury State Key Laboratory of Trauma Burns and Combined Injury; College of Preventive Medicine; Third Military Medical University; Chongqing 400038 China
| | - Yan Zhuang
- Key Laboratory for Nano-Bio Interface Research; Division of Nanobiomedicine; Suzhou Institute of Nano-Tech and Nano-Bionics; Chinese Academy of Sciences; Suzhou 215123 China
| | - Bai Xu
- Key Laboratory for Nano-Bio Interface Research; Division of Nanobiomedicine; Suzhou Institute of Nano-Tech and Nano-Bionics; Chinese Academy of Sciences; Suzhou 215123 China
| | - Jianwu Dai
- Key Laboratory for Nano-Bio Interface Research; Division of Nanobiomedicine; Suzhou Institute of Nano-Tech and Nano-Bionics; Chinese Academy of Sciences; Suzhou 215123 China
- Institute of Combined Injury State Key Laboratory of Trauma Burns and Combined Injury; College of Preventive Medicine; Third Military Medical University; Chongqing 400038 China
- Key Laboratory of Molecular Developmental Biology; Institute of Genetics and Developmental Biology Chinese Academy of Sciences; Beijing 100080 China
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26
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Yu S, Mao Z, Gao C. Preparation of gelatin density gradient on poly(ε-caprolactone) membrane and its influence on adhesion and migration of endothelial cells. J Colloid Interface Sci 2015; 451:177-83. [DOI: 10.1016/j.jcis.2015.03.056] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 03/29/2015] [Accepted: 03/30/2015] [Indexed: 10/23/2022]
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Ren T, Yu S, Mao Z, Gao C. A complementary density gradient of zwitterionic polymer brushes and NCAM peptides for selectively controlling directional migration of Schwann cells. Biomaterials 2015; 56:58-67. [DOI: 10.1016/j.biomaterials.2015.03.052] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 03/26/2015] [Accepted: 03/27/2015] [Indexed: 12/13/2022]
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28
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García S, Sunyer R, Olivares A, Noailly J, Atencia J, Trepat X. Generation of stable orthogonal gradients of chemical concentration and substrate stiffness in a microfluidic device. LAB ON A CHIP 2015; 15:2606-14. [PMID: 25977997 DOI: 10.1039/c5lc00140d] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Cellular responses to chemical cues are at the core of a myriad of fundamental biological processes ranging from embryonic development to cancer metastasis. Most of these biological processes are also influenced by mechanical cues such as the stiffness of the extracellular matrix. How a biological function is influenced by a synergy between chemical concentration and extracellular matrix stiffness is largely unknown, however, because no current strategy enables the integration of both types of cues in a single experiment. Here we present a robust microfluidic device that generates a stable, linear and diffusive chemical gradient over a biocompatible hydrogel with a well-defined stiffness gradient. Device fabrication relies on patterned PSA (Pressure Sensitive Adhesive) stacks that can be implemented with minimal cost and lab equipment. This technique is suitable for long-term observation of cell migration and application of traction force microscopy. We validate our device by testing MDCK cell scattering in response to perpendicular gradients of hepatocyte growth factor (HGF) and substrate stiffness.
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Affiliation(s)
- S García
- Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, 08028 Barcelona, Spain.
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BDNF-TrkB axis regulates migration of the lateral line primordium and modulates the maintenance of mechanoreceptor progenitors. PLoS One 2015; 10:e0119711. [PMID: 25751404 PMCID: PMC4353718 DOI: 10.1371/journal.pone.0119711] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 01/16/2015] [Indexed: 12/12/2022] Open
Abstract
BDNF and its specialized receptor TrkB are expressed in the developing lateral line system of zebrafish, but their role in this organ is unknown. To tackle this problem in vivo, we used transgenic animals expressing fluorescent markers in different cell types of the lateral line and combined a BDNF gain-of-function approach by BDNF mRNA overexpression and by soaking embryos in a solution of BDNF, with a loss-of-function approach by injecting the antisence ntrk2b-morpholino and treating embryos with the specific Trk inhibitor K252a. Subsequent analysis demonstrated that the BDNF-TrkB axis regulates migration of the lateral line primordium. In particular, BDNF-TrkB influences the expression level of components of chemokine signaling including Cxcr4b, and the generation of progenitors of mechanoreceptors, at the level of expression of Atoh1a-Atp2b1a.
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Tang YH, Ma YY, Zhang ZJ, Wang YT, Yang GY. Opportunities and challenges: stem cell-based therapy for the treatment of ischemic stroke. CNS Neurosci Ther 2015; 21:337-47. [PMID: 25676164 DOI: 10.1111/cns.12386] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Revised: 01/09/2015] [Accepted: 01/09/2015] [Indexed: 01/01/2023] Open
Abstract
Stem cell-based therapy for ischemic stroke has been widely explored in animal models and provides strong evidence of benefits. In this review, we summarize the types of stem cells, various delivery routes, and tracking tools for stem cell therapy of ischemic stroke. MSCs, EPCs, and NSCs are the most explored cell types for ischemic stroke treatment. Although the mechanisms of stem cell-based therapies are not fully understood, the most possible functions of the transplanted cells are releasing growth factors and regulating microenvironment through paracrine mechanism. Clinical application of stem cell-based therapy is still in its infancy. The next decade of stem cell research in stroke field needs to focus on combining different stem cells and different imaging modalities to fully explore the potential of this therapeutic avenue: from bench to bedside and vice versa.
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Affiliation(s)
- Yao-Hui Tang
- Neuroscience and Neuroengineering Center, Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
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31
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Shamloo A, Heibatollahi M, Mofrad MRK. Directional migration and differentiation of neural stem cells within three-dimensional microenvironments. Integr Biol (Camb) 2015; 7:335-44. [PMID: 25633746 DOI: 10.1039/c4ib00144c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Harnessing neural stem cells to repair neuronal damage is a promising potential treatment for neuronal diseases. To enable future therapeutic efficacy, the survival, proliferation, migration and differentiation of neural stem/progenitor cells (NPCs) should be accurately studied and optimized in in vitro platforms before transplanting these cells into the body for treatment purposes. Such studies can determine the appropriate quantities of the biochemical and biomechanical factors needed to control and optimize NPC behavior in vivo. In this study, NPCs were cultured within a microfluidic device while being encapsulated within the collagen matrix. The migration and differentiation of NPCs were studied in response to varying concentrations of nerve growth factor (NGF) and within varying densities of collagen matrices. It was shown that the migration and differentiation of NPCs can be significantly improved by providing the appropriate range of NGF concentrations while encapsulating the cells within the collagen matrix of optimal density. In particular, it was observed that within collagen matrices of intermediate density (0.9 mg ml(-1)), NPCs have a higher ability to migrate farther and in a collective manner while their differentiation into neurons is significantly higher and the cells can form protrusions and connections with their neighboring cells. Within collagen matrices with higher densities (1.8 mg ml(-1)), the cells did not migrate significantly as compared to the ones within lower matrix densities; within the matrices with lower collagen densities (0.45 mg ml(-1)) most of the cells migrated in an individual manner. However, no significant differentiation into neurons was observed for these two cases. It was also found that depending on the collagen matrix density, a minimum concentration of NGF caused a collective migration of NPCs, and a minimum concentration gradient of this factor stimulated the directional navigation of the cells. The results of this study can be implemented in designing platforms appropriate for regeneration of damaged neuronal systems.
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Affiliation(s)
- Amir Shamloo
- Molecular Cell Biomechanics Laboratory, Departments of Bioengineering and Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
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32
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Tchafa AM, Ta M, Reginato MJ, Shieh AC. EMT Transition Alters Interstitial Fluid Flow-Induced Signaling in ERBB2-Positive Breast Cancer Cells. Mol Cancer Res 2015; 13:755-64. [PMID: 25566992 DOI: 10.1158/1541-7786.mcr-14-0471] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 12/07/2014] [Indexed: 11/16/2022]
Abstract
UNLABELLED A variety of biophysical forces are altered in the tumor microenvironment (TME) and these forces can influence cancer progression. One such force is interstitial fluid flow (IFF)-the movement of fluid through the tissue matrix. IFF was previously shown to induce invasion of cancer cells, but the activated signaling cascades remain poorly understood. Here, it is demonstrated that IFF induces invasion of ERBB2/HER2-expressing breast cancer cells via activation of phosphoinositide-3-kinase (PI3K). In constitutively activate ERBB2-expressing cells that have undergone epithelial-to-mesenchymal transition (EMT), IFF-mediated invasion requires the chemokine receptor CXCR4, a gradient of its ligand CXCL12, and activity of the PI3K catalytic subunits p110α and β. In wild-type ERBB2-expressing cells, IFF-mediated invasion is chemokine receptor-independent and requires only p110α activation. To test whether cells undergoing EMT alter their signaling response to IFF, TGFβ1 was used to induce EMT in wild-type ERBB2-expressing cells, resulting in IFF-induced invasion dependent on CXCR4 and p110β. IMPLICATIONS This study identifies a novel signaling mechanism for interstitial flow-induced invasion of ERBB2-expressing breast cancer cells, one that depends on EMT and acts through a CXCR4-PI3K pathway. These findings suggest that the response of cancer cells to interstitial flow depends on EMT status and malignancy.
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Affiliation(s)
- Alimatou M Tchafa
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania
| | - Mi Ta
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania
| | - Mauricio J Reginato
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, Pennsylvania.
| | - Adrian C Shieh
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania.
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Xiao RR, Wang L, Zhang L, Liu YN, Yu XL, Huang WH. Quantifying biased response of axon to chemical gradient steepness in a microfluidic device. Anal Chem 2014; 86:11649-56. [PMID: 25381866 DOI: 10.1021/ac504159g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Axons are very sensitive to molecular gradients and can discriminate extremely small differences in gradient steepness. Microfluidic devices capable of generating chemical gradients and adjusting their steepness could be used to quantify the sensitivity of axonal response. Here, we present a versatile and robust microfluidic device that can generate substrate-bound molecular gradients with evenly varying steepness on a single chip to precisely quantify axonal response. In this device, two solutions are perfused into a central channel via two inlets while partially flowing into two peripheral channels through interconnecting grooves, which gradually decrease the fluid velocity along the central channel. Molecular gradients with evenly and gradually decreased steepness can therefore be generated with a high resolution that is less than 0.05%/mm. In addition, the overall distribution range and resolution of the gradient steepness can be highly and flexibly controlled by adjusting various parameters of the device. Using this device, we quantified the hippocampal axonal response to substrate-bound laminin and ephrin-A5 gradients with varying steepnesses. Our results provided more detailed information on how and to what extent different steepnesses guide hippocampal neuron development during the initial outgrowth. Furthermore, our results show that axons can sensitively respond to very shallow laminin and ephrin-A5 gradients, which could effectively initiate biased differentiation of hippocampal neurons in the steepness range investigated in this study.
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Affiliation(s)
- Rong-Rong Xiao
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China
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Moreno-Arotzena O, Mendoza G, Cóndor M, Rüberg T, García-Aznar JM. Inducing chemotactic and haptotactic cues in microfluidic devices for three-dimensional in vitro assays. BIOMICROFLUIDICS 2014; 8:064122. [PMID: 25587374 PMCID: PMC4265035 DOI: 10.1063/1.4903948] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 12/22/2014] [Accepted: 11/28/2014] [Indexed: 05/09/2023]
Abstract
Microfluidic devices allow for the production of physiologically relevant cellular microenvironments by including biomimetic hydrogels and generating controlled chemical gradients. During transport, the biomolecules interact in distinct ways with the fibrillar networks: as purely diffusive factors in the soluble fluid or bound to the matrix proteins. These two main mechanisms may regulate distinct cell responses in order to guide their directional migration: caused by the substrate-bound chemoattractant gradient (haptotaxis) or by the gradient established within the soluble fluid (chemotaxis). In this work 3D diffusion experiments, in combination with ELISA assays, are performed using microfluidic platforms in order to quantify the distribution of PDGF-BB and TGF-β1 across collagen and fibrin gels. Furthermore, to gain a deeper understanding of the fundamental processes, the experiments are reproduced by computer simulations based on a reaction-diffusion transport model. This model yields an accurate prediction of the experimental results, confirming that diffusion and binding phenomena are established within the microdevice.
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Affiliation(s)
- O Moreno-Arotzena
- Multiscale in Mechanical and Biological Engineering, Aragon Institute of Engineering Research, University of Zaragoza , Zaragoza, Spain
| | - G Mendoza
- Multiscale in Mechanical and Biological Engineering, Aragon Institute of Engineering Research, University of Zaragoza , Zaragoza, Spain
| | - M Cóndor
- Multiscale in Mechanical and Biological Engineering, Aragon Institute of Engineering Research, University of Zaragoza , Zaragoza, Spain
| | | | - J M García-Aznar
- Multiscale in Mechanical and Biological Engineering, Aragon Institute of Engineering Research, University of Zaragoza , Zaragoza, Spain
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Xu H, Ferreira MM, Heilshorn SC. Small-molecule axon-polarization studies enabled by a shear-free microfluidic gradient generator. LAB ON A CHIP 2014; 14:2047-56. [PMID: 24781157 PMCID: PMC4528973 DOI: 10.1039/c4lc00162a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A deep understanding of the mechanisms behind neurite polarization and axon path-finding is important for interpreting how the human body guides neurite growth during development and response to injury. Further, it is of great clinical importance to identify diffusible chemical cues that promote neurite regeneration for nervous tissue repair. Despite the fast development of various types of concentration gradient generators, it has been challenging to fabricate neuron-friendly (i.e. shear-free and biocompatible for neuron growth and maturation) devices to create stable gradients, particularly for fast diffusing small molecules, which typically require high flow and shear rates. Here we present a finite element analysis for a polydimethylsiloxane/polyethylene glycol diacrylate (PDMS/PEG-DA) based gradient generator, describe the microfabrication process, and validate its use for neuronal axon polarization studies. This device provides a totally shear-free, biocompatible microenvironment with a linear and stable concentration gradient of small molecules such as forskolin. The gradient profile in this device can be customized by changing the composition or width of the PEG-DA barriers during direct UV photo-patterning within a permanently bonded PDMS device. Primary rat cortical neurons (embryonic E18) exposed to soluble forskolin gradients for 72 h exhibited statistically significant polarization and guidance of their axons. This device provides a useful platform for both chemotaxis and directional guidance studies, particularly for shear sensitive and non-adhesive cell cultures, while allowing fast new device design prototyping at a low cost.
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Affiliation(s)
- Hui Xu
- Department of Materials Science and Engineering, Stanford Cardiovascular Institute, Stanford University, 476 Lomita Mall, McCullough Building, Stanford, CA 94305-4045, USA.
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36
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Phillips C, Baktir MA, Srivatsan M, Salehi A. Neuroprotective effects of physical activity on the brain: a closer look at trophic factor signaling. Front Cell Neurosci 2014; 8:170. [PMID: 24999318 PMCID: PMC4064707 DOI: 10.3389/fncel.2014.00170] [Citation(s) in RCA: 188] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 06/02/2014] [Indexed: 12/18/2022] Open
Abstract
While the relationship between increased physical activity and cognitive ability has been conjectured for centuries, only recently have the mechanisms underlying this relationship began to emerge. Convergent evidence suggests that physical activity offers an affordable and effective method to improve cognitive function in all ages, particularly the elderly who are most vulnerable to neurodegenerative disorders. In addition to improving cardiac and immune function, physical activity alters trophic factor signaling and, in turn, neuronal function and structure in areas critical for cognition. Sustained exercise plays a role in modulating anti-inflammatory effects and may play a role in preserving cognitive function in aging and neuropathological conditions. Moreover, recent evidence suggests that myokines released by exercising muscles affect the expression of brain-derived neurotrophic factor synthesis in the dentate gyrus of the hippocampus, a finding that could lead to the identification of new and therapeutically important mediating factors. Given the growing number of individuals with cognitive impairments worldwide, a better understanding of how these factors contribute to cognition is imperative, and constitutes an important first step toward developing non-pharmacological therapeutic strategies to improve cognition in vulnerable populations.
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Affiliation(s)
- Cristy Phillips
- Department of Physical Therapy, Arkansas State University Jonesboro, AR, USA
| | - Mehmet Akif Baktir
- Department of Physiology, Erciyes University Kayseri, Turkey; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Malathi Srivatsan
- Department of Biological Sciences, Arkansas State University Jonesboro, AR, USA
| | - Ahmad Salehi
- VA Palo Alto Health Care System Palo Alto, CA, USA
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Ren T, Yu S, Mao Z, Moya SE, Han L, Gao C. Complementary Density Gradient of Poly(hydroxyethyl methacrylate) and YIGSR Selectively Guides Migration of Endotheliocytes. Biomacromolecules 2014; 15:2256-64. [DOI: 10.1021/bm500385n] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tanchen Ren
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Shan Yu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Zhengwei Mao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | | | - Lulu Han
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Changyou Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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Williams JL, Patel JR, Daniels BP, Klein RS. Targeting CXCR7/ACKR3 as a therapeutic strategy to promote remyelination in the adult central nervous system. ACTA ACUST UNITED AC 2014; 211:791-9. [PMID: 24733828 PMCID: PMC4010893 DOI: 10.1084/jem.20131224] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Current treatment modalities for the neurodegenerative disease multiple sclerosis (MS) use disease-modifying immunosuppressive compounds but do not promote repair. Although several potential targets that may induce myelin production have been identified, there has yet to be an approved therapy that promotes remyelination in the damaged central nervous system (CNS). Remyelination of damaged axons requires the generation of new oligodendrocytes from oligodendrocyte progenitor cells (OPCs). Although OPCs are detected in MS lesions, repair of myelin is limited, contributing to progressive clinical deterioration. In the CNS, the chemokine CXCL12 promotes remyelination via CXCR4 activation on OPCs, resulting in their differentiation into myelinating oligodendrocytes. Although the CXCL12 scavenging receptor CXCR7/ACKR3 (CXCR7) is also expressed by OPCs, its role in myelin repair in the adult CNS is unknown. We show that during cuprizone-induced demyelination, in vivo CXCR7 antagonism augmented OPC proliferation, leading to increased numbers of mature oligodendrocytes within demyelinated lesions. CXCR7-mediated effects on remyelination required CXCR4 activation, as assessed via both phospho-S339-CXCR4-specific antibodies and administration of CXCR4 antagonists. These findings identify a role for CXCR7 in OPC maturation during remyelination and are the first to use a small molecule to therapeutically enhance myelin repair in the demyelinated adult CNS.
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Affiliation(s)
- Jessica L Williams
- Department of Internal Medicine, 2 Department of Pathology and Immunology, and 3 Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, MO 63110
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39
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Ertl P, Sticker D, Charwat V, Kasper C, Lepperdinger G. Lab-on-a-chip technologies for stem cell analysis. Trends Biotechnol 2014; 32:245-53. [PMID: 24726257 DOI: 10.1016/j.tibtech.2014.03.004] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Revised: 02/20/2014] [Accepted: 03/05/2014] [Indexed: 01/21/2023]
Abstract
The combination of microfabrication-based technologies with cell biology has laid the foundation for the development of advanced in vitro diagnostic systems capable of analyzing cell cultures under physiologically relevant conditions. In the present review, we address recent lab-on-a-chip developments for stem cell analysis. We highlight in particular the tangible advantages of microfluidic devices to overcome most of the challenges associated with stem cell identification, expansion and differentiation, with the greatest advantage being that lab-on-a-chip technology allows for the precise regulation of culturing conditions, while simultaneously monitoring relevant parameters using embedded sensory systems. State-of-the-art lab-on-a-chip platforms for in vitro assessment of stem cell cultures are presented and their potential future applications discussed.
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Affiliation(s)
- Peter Ertl
- BioSensor Technologies, AIT Austrian Institute of Technology GmbH, Vienna, Austria.
| | - Drago Sticker
- BioSensor Technologies, AIT Austrian Institute of Technology GmbH, Vienna, Austria
| | - Verena Charwat
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Cornelia Kasper
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
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40
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McLaughlin LM, Xu H, Carden SE, Fisher S, Reyes M, Heilshorn SC, Monack DM. A microfluidic-based genetic screen to identify microbial virulence factors that inhibit dendritic cell migration. Integr Biol (Camb) 2014; 6:438-49. [PMID: 24599496 DOI: 10.1039/c3ib40177d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Microbial pathogens are able to modulate host cells and evade the immune system by multiple mechanisms. For example, Salmonella injects effector proteins into host cells and evades the host immune system in part by inhibiting dendritic cell (DC) migration. The identification of microbial factors that modulate normal host functions should lead to the development of new classes of therapeutics that target these pathways. Current screening methods to identify either host or pathogen genes involved in modulating migration towards a chemical signal are limited because they do not employ stable, precisely controlled chemical gradients. Here, we develop a positive selection microfluidic-based genetic screen that allows us to identify Salmonella virulence factors that manipulate DC migration within stable, linear chemokine gradients. Our screen identified 7 Salmonella effectors (SseF, SifA, SspH2, SlrP, PipB2, SpiC and SseI) that inhibit DC chemotaxis toward CCL19. This method is widely applicable for identifying novel microbial factors that influence normal host cell chemotaxis as well as revealing new mammalian genes involved in directed cell migration.
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Shamloo A, Manchandia M, Ferreira M, Mani M, Nguyen C, Jahn T, Weinberg K, Heilshorn S. Complex chemoattractive and chemorepellent Kit signals revealed by direct imaging of murine mast cells in microfluidic gradient chambers. Integr Biol (Camb) 2014; 5:1076-85. [PMID: 23835699 DOI: 10.1039/c3ib40025e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Besides its cooperating effects on stem cell proliferation and survival, Kit ligand (KL) is a potent chemotactic protein. While transwell assays permit studies of the frequency of migrating cells, the lack of direct visualization precludes dynamic chemotaxis studies. In response, we utilize microfluidic chambers that enable direct observation of murine bone marrow-derived mast cells (BMMC) within stable KL gradients. Using this system, individual Kit+ BMMC were quantitatively analyzed for migration speed and directionality during KL-induced chemotaxis. Our results indicated a minimum activating threshold of ~3 ng ml(-1) for chemoattraction. Analysis of cells at KL concentrations below 3 ng ml(-1) revealed a paradoxical chemorepulsion, which has not been described previously. Unlike chemoattraction, which occurred continuously after an initial time lag, chemorepulsion occurred only during the first 90 minutes of observation. Both chemoattraction and chemorepulsion required the action of G-protein coupled receptors (GPCR), as treatment with pertussis toxin abrogated directed migration. These results differ from previous studies of GPCR-mediated chemotaxis, where chemorepulsion occurred at high ligand concentrations. These data indicate that Kit-mediated chemotaxis is more complex than previously understood, with the involvement of GPCRs in addition to the Kit receptor tyrosine kinase and the presence of both chemoattractive and chemorepellent phases.
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Affiliation(s)
- Amir Shamloo
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-4045, USA
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