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Jariwala N, Ozols M, Eckersley A, Mambwe B, Watson REB, Zeef L, Gilmore A, Debelle L, Bell M, Bradley EJ, Doush Y, Keenan A, Courage C, Leroux R, Peschard O, Mondon P, Ringenbach C, Bernard L, Pitois A, Sherratt MJ. Prediction, screening and characterization of novel bioactive tetrapeptide matrikines for skin rejuvenation. Br J Dermatol 2024; 191:92-106. [PMID: 38375775 DOI: 10.1093/bjd/ljae061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 02/08/2024] [Accepted: 02/10/2024] [Indexed: 02/21/2024]
Abstract
BACKGROUND Extracellular matrices play a critical role in tissue structure and function and aberrant remodelling of these matrices is a hallmark of many age-related diseases. In skin, loss of dermal collagens and disorganization of elastic fibre components are key features of photoageing. Although the application of some small matrix-derived peptides to aged skin has been shown to beneficially affect in vitro cell behaviour and, in vivo, molecular architecture and clinical appearance, the discovery of new peptides has lacked a guiding hypothesis. OBJECTIVES To identify, using protease cleavage site prediction, novel putative matrikines with beneficial activities for skin composition and structure. METHODS Here, we present an in silico (peptide cleavage prediction) to in vitro (proteomic and transcriptomic activity testing in cultured human dermal fibroblasts) to in vivo (short-term patch test and longer-term split-face clinical study) discovery pipeline, which enables the identification and characterization of peptides with differential activities. RESULTS Using this pipeline we showed that cultured fibroblasts were responsive to all applied peptides, but their associated bioactivity was sequence-dependent. Based on bioactivity, toxicity and protein source, we further characterized a combination of two novel peptides, GPKG (glycine-proline-lysine-glycine) and LSVD (leucine-serine-valine-aspartate), that acted in vitro to enhance the transcription of matrix -organization and cell proliferation genes and in vivo (in a short-term patch test) to promote processes associated with epithelial and dermal maintenance and remodelling. Prolonged use of a formulation containing these peptides in a split-face clinical study led to significantly improved measures of crow's feet and firmness in a mixed population. CONCLUSIONS This approach to peptide discovery and testing can identify new synthetic matrikines, providing insights into biological mechanisms of tissue homeostasis and repair and new pathways to clinical intervention.
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Affiliation(s)
- Nathan Jariwala
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Science
| | - Matiss Ozols
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Science
- Department of Human Genetics, Wellcome Sanger Institute, Genome Campus, Hinxton, UK
- British Heart Foundation Centre of Research Excellence, University of Cambridge, Cambridge, UK
| | - Alexander Eckersley
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Science
- Division of Musculoskeletal and Dermatological Sciences
| | | | - Rachel E B Watson
- Division of Musculoskeletal and Dermatological Sciences
- A*STAR Skin Research Laboratory (A*SRL), Agency for Science, Technology and Research (A*STAR) and National Skin Centre, Skin Research Institute of Singapore, Republic of Singapore
| | | | - Andrew Gilmore
- Wellcome Centre for Cell Matrix Research, Division of Cancer Sciences; Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - Laurent Debelle
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Science
- UMR CNRS 7369 MEDyC, Université de Reims Champagne Ardenne, UFR Sciences Exactes et Naturelles, SFR CAP Santé, Moulin de la Housse, Reims, France
| | - Mike Bell
- No7 Beauty Company, Walgreens Boots Alliance, Nottingham, UK
| | | | - Yegor Doush
- No7 Beauty Company, Walgreens Boots Alliance, Nottingham, UK
| | - Amy Keenan
- No7 Beauty Company, Walgreens Boots Alliance, Nottingham, UK
| | - Carole Courage
- No7 Beauty Company, Walgreens Boots Alliance, Nottingham, UK
| | | | | | | | | | | | | | - Michael J Sherratt
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Science
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Zhou W, Rahman MSU, Sun C, Li S, Zhang N, Chen H, Han CC, Xu S, Liu Y. Perspectives on the Novel Multifunctional Nerve Guidance Conduits: From Specific Regenerative Procedures to Motor Function Rebuilding. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307805. [PMID: 37750196 DOI: 10.1002/adma.202307805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 09/19/2023] [Indexed: 09/27/2023]
Abstract
Peripheral nerve injury potentially destroys the quality of life by inducing functional movement disorders and sensory capacity loss, which results in severe disability and substantial psychological, social, and financial burdens. Autologous nerve grafting has been commonly used as treatment in the clinic; however, its rare donor availability limits its application. A series of artificial nerve guidance conduits (NGCs) with advanced architectures are also proposed to promote injured peripheral nerve regeneration, which is a complicated process from axon sprouting to targeted muscle reinnervation. Therefore, exploring the interactions between sophisticated NGC complexes and versatile cells during each process including axon sprouting, Schwann cell dedifferentiation, nerve myelination, and muscle reinnervation is necessary. This review highlights the contribution of functional NGCs and the influence of microscale biomaterial architecture on biological processes of nerve repair. Progressive NGCs with chemical molecule induction, heterogenous topographical morphology, electroactive, anisotropic assembly microstructure, and self-powered electroactive and magnetic-sensitive NGCs are also collected, and they are expected to be pioneering features in future multifunctional and effective NGCs.
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Affiliation(s)
- Weixian Zhou
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety & CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Muhammad Saif Ur Rahman
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education Guangdong province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Chengmei Sun
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education Guangdong province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Shilin Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety & CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Nuozi Zhang
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Hao Chen
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Charles C Han
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
- Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Shanshan Xu
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
- Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Ying Liu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety & CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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3
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Kong J, Teng C, Liu F, Wang X, Zhou Y, Zong Y, Wan Z, Qin J, Yu B, Mi D, Wang Y. Enhancing regeneration and repair of long-distance peripheral nerve defect injuries with continuous microcurrent electrical nerve stimulation. Front Neurosci 2024; 18:1361590. [PMID: 38406586 PMCID: PMC10885699 DOI: 10.3389/fnins.2024.1361590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 01/29/2024] [Indexed: 02/27/2024] Open
Abstract
Introduction Peripheral nerve injuries, especially those involving long-distance deficits, pose significant challenges in clinical repair. This study explores the potential of continuous microcurrent electrical nerve stimulation (cMENS) as an adjunctive strategy to promote regeneration and repair in such cases. Methods The study initially optimized cMENS parameters and assessed its impact on Schwann cell activity, neurotrophic factor secretion, and the nerve regeneration microenvironment. Subsequently, a rat sciatic nerve defect-bridge repair model was employed to evaluate the reparative effects of cMENS as an adjuvant treatment. Functional recovery was assessed through gait analysis, motor function tests, and nerve conduction assessments. Additionally, nerve regeneration and denervated muscle atrophy were observed through histological examination. Results The study identified a 10-day regimen of 100uA microcurrent stimulation as optimal. Evaluation focused on Schwann cell activity and the microenvironment, revealing the positive impact of cMENS on maintaining denervated Schwann cell proliferation and enhancing neurotrophic factor secretion. In the rat model of sciatic nerve defect-bridge repair, cMENS demonstrated superior effects compared to control groups, promoting motor function recovery, nerve conduction, and sensory and motor neuron regeneration. Histological examinations revealed enhanced maturation of regenerated nerve fibers and reduced denervated muscle atrophy. Discussion While cMENS shows promise as an adjuvant treatment for long-distance nerve defects, future research should explore extended stimulation durations and potential synergies with tissue engineering grafts to improve outcomes. This study contributes comprehensive evidence supporting the efficacy of cMENS in enhancing peripheral nerve regeneration.
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Affiliation(s)
- Junjie Kong
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Cheng Teng
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Fenglan Liu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Xuzhaoyu Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Yi Zhou
- Department of Orthopedics, Nantong City Hospital of Traditional Chinese Medicine, Nantong, China
| | - Ying Zong
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Zixin Wan
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Jun Qin
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Bin Yu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
| | - Daguo Mi
- Department of Orthopedics, Nantong City Hospital of Traditional Chinese Medicine, Nantong, China
| | - Yaxian Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Affiliated Hospital and Medical School, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
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Yun J, Jin X, Sun Q, Xu L, Gao J, Wang X, Zhao S. Transcriptional Analysis of Mice Melanoma B16-F10 Cells in Response to Directed Current Electric Fields. Bioelectromagnetics 2022; 43:297-308. [PMID: 35638237 DOI: 10.1002/bem.22412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/21/2022] [Accepted: 05/04/2022] [Indexed: 11/10/2022]
Abstract
The endogenous electric field (EF) is widely observed among tissues. It is supposed to be an important environmental factor in tumor metastasis. To explore the role of endogenous EFs in tumor metastasis, the migration of mouse melanoma B16-F10 cells in directed current EFs (dcEFs) was investigated. The transcriptome of melanoma B16-F10 cells in response to EF stimulation was analyzed using RNA sequencing. The results demonstrated that the mouse melanoma B16-F10 cells migrated toward the cathode in applied dcEFs. Directional migration occurred in a voltage-dependent manner. Approximately 3000 upregulated and 2613 downregulated genes were identified under dcEF. Some genes correlated with cell migration, such as Serpine1, Ctgf, Fosb, and Fos, were upregulated. The signaling pathways involved in cell motility were significantly altered. Some genes, highly related to tumorigenesis, invasion, and metastasis, are upregulated in response to EF stimulation. Endogenous EFs may play a role in tumorigenesis and metastasis in vivo. © 2022 Bioelectromagnetics Society.
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Affiliation(s)
- Jinlei Yun
- School of Life Sciences, Yunnan Normal University, Kunming, China
| | - Xiaoli Jin
- School of Life Sciences, Yunnan Normal University, Kunming, China
| | - Qin Sun
- School of Life Sciences, Yunnan Normal University, Kunming, China
| | - Linfeng Xu
- School of Life Sciences, Yunnan Normal University, Kunming, China.,Division of Life science and Medicine, University of Science and Technology of China, Hefei, China
| | - Jing Gao
- School of Life Sciences, Yunnan Normal University, Kunming, China.,School of Agriculture, Yunnan University, Kunming, China
| | - Xiaoyan Wang
- School of Life Sciences, Yunnan Normal University, Kunming, China
| | - Sanjun Zhao
- School of Life Sciences, Yunnan Normal University, Kunming, China
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5
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Afjeh-Dana E, Naserzadeh P, Moradi E, Hosseini N, Seifalian AM, Ashtari B. Stem Cell Differentiation into Cardiomyocytes: Current Methods and Emerging Approaches. Stem Cell Rev Rep 2022; 18:2566-2592. [PMID: 35508757 DOI: 10.1007/s12015-021-10280-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2021] [Indexed: 12/26/2022]
Abstract
Cardiovascular diseases (CVDs) are globally known to be important causes of mortality and disabilities. Common treatment strategies for CVDs, such as pharmacological therapeutics impose serious challenges due to the failure of treatments for myocardial necrosis. By contrast, stem cells (SCs) based therapies are seen to be promising approaches to CVDs treatment. In such approaches, cardiomyocytes are differentiated from SCs. To fulfill SCs complete potential, the method should be appointed to generate cardiomyocytes with more mature structure and well-functioning operations. For heart repairing applications, a greatly scalable and medical-grade cardiomyocyte generation must be used. Nonetheless, there are some challenges such as immune rejection, arrhythmogenesis, tumorigenesis, and graft cell death potential. Herein, we discuss the types of potential SCs, and commonly used methods including embryoid bodies related techniques, co-culture, mechanical stimulation, and electrical stimulation and their applications, advantages and limitations in this field. An estimated 17.9 million people died from CVDs in 2019, representing 32 % of all global deaths. Of these deaths, 85 % were due to heart attack and stroke.
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Affiliation(s)
- Elham Afjeh-Dana
- Radiation Biology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | - Parvaneh Naserzadeh
- Radiation Biology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | - Elham Moradi
- Radiation Biology Research Centre, Iran University of Medical Sciences, Tehran, Iran.,Endocrine Research Center, Institute of Endocrinology and Metabolism, Iran University of Medical Sciences, Tehran, Iran
| | - Nasrin Hosseini
- Neuroscience Research Centre, Iran University of Medical Sciences, Tehran, Iran.
| | - Alexander Marcus Seifalian
- Nanotechnology & Regenerative Medicine Commercialisation Centre (NanoRegMed Ltd), London BioScience Innovation Centre, London, UK
| | - Behnaz Ashtari
- Radiation Biology Research Centre, Iran University of Medical Sciences, Tehran, Iran. .,Endocrine Research Center, Institute of Endocrinology and Metabolism, Iran University of Medical Sciences, Tehran, Iran. .,Cellular and Molecular Research Centre, Iran University of Medical Sciences, Tehran, Iran.
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6
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Sanie-Jahromi F, Azizi A, Shariat S, Johari M. Effect of Electrical Stimulation on Ocular Cells: A Means for Improving Ocular Tissue Engineering and Treatments of Eye Diseases. BIOMED RESEARCH INTERNATIONAL 2021; 2021:6548554. [PMID: 34840978 PMCID: PMC8612806 DOI: 10.1155/2021/6548554] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 09/25/2021] [Accepted: 11/08/2021] [Indexed: 01/09/2023]
Abstract
Tissue engineering is biomedical engineering that uses suitable biochemical and physicochemical factors to assemble functional constructs that restore or improve damaged tissues. Recently, cell therapies as a subset of tissue engineering have been very promising in the treatment of ocular diseases. One of the most important biophysical factors to make this happen is noninvasive electrical stimulation (ES) to target ocular cells that may preserve vision in multiple retinal and optic nerve diseases. The science of cellular and biophysical interactions is very exciting in regenerative medicine now. Although the exact effect of ES on cells is unknown, multiple mechanisms are considered to underlie the effects of ES, including increased production of neurotrophic agents, improved cell migration, and inhibition of proinflammatory cytokines and cellular apoptosis. In this review, we highlighted the effects of ES on ocular cells, especially on the corneal, retinal, and optic nerve cells. Initially, we summarized the current literature on the in vitro and in vivo effects of ES on ocular cells and then we provided the clinical studies describing the effect of ES on ocular complications. For each area, we used some of the most impactful articles to show the important concepts and results that advanced the state of these interactions. We conclude with reflections on emerging new areas and perspectives for future development in this field.
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Affiliation(s)
- Fatemeh Sanie-Jahromi
- Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ali Azizi
- Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sahar Shariat
- Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammadkarim Johari
- Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
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Lang M, Bunn S, Gopalakrishnan B, Li J. Use of weak DC electric fields to rapidly align mammalian cells. J Neural Eng 2021; 18. [PMID: 34544059 DOI: 10.1088/1741-2552/ac284b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/20/2021] [Indexed: 11/11/2022]
Abstract
Objective.The ability to modulate cell morphology has clinical relevance in regenerative biology. For example, cells of the skeletal muscle, peripheral nerve and vasculature have specific oriented architectures that emerge from unique structure-function relationships. Methods that can induce similar cell morphologiesin vitrocan be of use in the development of biomimetic constructs for the repair or replacement of damaged tissues. In this work, we demonstrate that direct current (DC) electric fields (EFs) can be used as a tool to globally align cell populationsin vitro. Approach.Using a 2D culture chamber system, we were able to quickly (within hours) align Schwann cells at different culture densities with an application of steady EFs at 200-500 mV mm-1.Main results.Cellular alignment was perpendicular to the field vector and varied proportionately as a function of field magnitude. In addition, the degree of cellular alignment was also dependent on cellular density. Even well-established Schwann cell monolayers were responsive to the applied DC fields with cells retracting parallel oriented processes (with respect to the imposed field) and re-extending them along the perpendicular axis. When the DC field was removed, monolayers retained the aligned morphology for many days afterwards, likely due to contact inhibition. We further show the method is applicable to other field-responsive cells, such as 3T3 fibroblasts.Significance.The patterned cells provided nanoscale haptotactic cues and can be subsequently used as a basal layer for co-culturing or manipulated for other applications. DC fields represent a rapid, simple, and efficient technique compared to other cell patterning methods such as substrate manipulation.
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Affiliation(s)
- Mary Lang
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, 47907, United States of America.,Veterinary Center for Paralysis Research, Purdue University, West Lafayette, IN, 47907, United States of America
| | - Spencer Bunn
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, 47907, United States of America.,Veterinary Center for Paralysis Research, Purdue University, West Lafayette, IN, 47907, United States of America
| | - Bhavani Gopalakrishnan
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, 47907, United States of America.,Veterinary Center for Paralysis Research, Purdue University, West Lafayette, IN, 47907, United States of America
| | - Jianming Li
- Veterinary Center for Paralysis Research, Purdue University, West Lafayette, IN, 47907, United States of America.,Department of Basic Medical Sciences, Purdue University, West Lafayette, IN, 47907, United States of America
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Analysis of the Differential Gene and Protein Expression Profiles of Corneal Epithelial Cells Stimulated with Alternating Current Electric Fields. Genes (Basel) 2021; 12:genes12020299. [PMID: 33672614 PMCID: PMC7924190 DOI: 10.3390/genes12020299] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/10/2021] [Accepted: 02/17/2021] [Indexed: 12/17/2022] Open
Abstract
In cells, intrinsic endogenous direct current (DC) electric fields (EFs) serve as morphogenetic cues and are necessary for several important cellular responses including activation of multiple signaling pathways, cell migration, tissue regeneration and wound healing. Endogenous DC EFs, generated spontaneously following injury in physiological conditions, directly correlate with wound healing rate, and different cell types respond to these EFs via directional orientation and migration. Application of external DC EFs results in electrode polarity and is known to activate intracellular signaling events in specific direction. In contrast, alternating current (AC) EFs are known to induce continuous bidirectional flow of charged particles without electrode polarity and also minimize electrode corrosion. In this context, the present study is designed to study effects of AC EFs on corneal epithelial cell gene and protein expression profiles in vitro. We performed gene and antibody arrays, analyzed the data to study specific influence of AC EFs, and report that AC EFs has no deleterious effect on epithelial cell function. Gene Ontology results, following gene and protein array data analysis, showed that AC EFs influence similar biological processes that are predominantly responsive to organic substance, chemical, or external stimuli. Both arrays activate cytokine–cytokine receptor interaction, MAPK and IL-17 signaling pathways. Further, in comparison to the gene array data, the protein array data show enrichment of diverse activated signaling pathways through several interconnecting networks.
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Chen J, Guan L, Fan P, Liu X, Liu R, Liu Y, Bai H. In vitro study of the effects of DC electric fields on cell activities and gene expression in human choriocarcinoma cells. Electromagn Biol Med 2021; 40:49-64. [PMID: 33179558 DOI: 10.1080/15368378.2020.1846555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 11/01/2020] [Indexed: 02/08/2023]
Abstract
Physiological electric fields (EFs), as one of the environmental cues influencing both normal and tumor cells, have profound effects on tumor cell malignancy potential. The cellular responses to EFs by choriocarcinoma cells and their underlying mechanisms are unknown. In this study, the migration/motility, cell cycle progression and proliferation of choriocarcinoma cells in electric field culture showed that choriocarcinoma cells migrated cathodally in an applied EF, and EF stimulation influenced cell cycle progression through G2/M arrest and therefore induced a reduction in cellular proliferation. The transcriptome of choriocarcinoma cells subjected to EF stimulation (150 mV/mm) was analyzed using RNA sequencing (RNA-Seq), and the results were verified by reverse transcription quantitative polymerase chain reaction. A Kyoto Encyclopedia of Genes and Genomes pathway analysis revealed that ErbB and HIF-1 signaling pathways that are involved in cell migration/motility, cell cycle progression and proliferation were significantly altered in cells treated with an EF of 150 mV/mm compared with control cells, and in addition, the downstream pathways of these signaling pathways such as AKT and P42/P44 MAPK (ERK1/2) showed primary activation by Western blotting. This study's results suggest that an applied EF is an effective cue in regulating cellular phenotypes of choriocarcinoma cells and that transcriptional analysis contributes to the understanding of the mechanism of EF-guided cell functions.
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Affiliation(s)
- Jinxin Chen
- Laboratory of Genetic Disease and Perinatal Medicine and Key Laboratory of Birth Defects and Related Diseases of Women and Children of the Ministry of Education, West China Second University Hospital, Sichuan University , Chengdu, P. R. China
- Department of Biochemistry, North Sichuan Medical College , Nanchong, P. R. China
| | - Linbo Guan
- Laboratory of Genetic Disease and Perinatal Medicine and Key Laboratory of Birth Defects and Related Diseases of Women and Children of the Ministry of Education, West China Second University Hospital, Sichuan University , Chengdu, P. R. China
| | - Ping Fan
- Laboratory of Genetic Disease and Perinatal Medicine and Key Laboratory of Birth Defects and Related Diseases of Women and Children of the Ministry of Education, West China Second University Hospital, Sichuan University , Chengdu, P. R. China
| | - Xinghui Liu
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University , Chengdu, P. R. China
| | - Rui Liu
- Division of Peptides Related with Human Disease, West China Hospital, Sichuan University , Chengdu, P. R. China
| | - Yu Liu
- Department of Biochemistry and Molecular Biology, West China School of Preclinical and Forensic Medicine, Sichuan University , Chengdu, P. R. China
| | - Huai Bai
- Laboratory of Genetic Disease and Perinatal Medicine and Key Laboratory of Birth Defects and Related Diseases of Women and Children of the Ministry of Education, West China Second University Hospital, Sichuan University , Chengdu, P. R. China
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10
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Li L, Hu C, Lu C, Zhang K, Han R, Lin C, Zhao S, A C, Cheng C, Zhao M, He Y. Applied electric fields suppress osimertinib-induced cytotoxicity via inhibiting FOXO3a nuclear translocation through AKT activation. Carcinogenesis 2020; 41:600-610. [PMID: 31504249 DOI: 10.1093/carcin/bgz150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 07/16/2019] [Accepted: 08/29/2019] [Indexed: 12/12/2022] Open
Abstract
Osimertinib is a third-generation epidermal growth factor receptor tyrosine kinase inhibitor against T790M-mutant non-small cell lung cancer (NSCLC). Acquired resistance to osimertinib is a growing clinical challenge that is not fully understood. Endogenous electric fields (EFs), components of the tumor microenvironment, are associated with cancer cell migration and proliferation. However, the impact of EFs on drug efficiency has not been studied. In this study, we observed that EFs counteracted the effects of osimertinib. EFs of 100 mV/mm suppressed osimertinib-induced cell death and promoted cell proliferation. Transcriptional analysis revealed that the expression pattern induced by osimertinib was altered by EFs stimulation. KEGG analysis showed that differential expression genes were mostly enriched in PI3K-AKT pathway. Then, we found that osimertinib inhibited AKT phosphorylation, while EFs stimulation resulted in significant activation of AKT, which could override the effects generated by osimertinib. Importantly, pharmacological inhibition of PI3K/AKT by LY294002 diminished EF-induced activation of AKT and restored the cytotoxicity of osimertinib suppressed by EFs, which proved that AKT activation was essential for EFs to attenuate the efficacy of osimertinib. Furthermore, activation of AKT by EFs led to phosphorylation of forkhead box O3a (FOXO3a), and reduction in nuclear translocation of FOXO3a induced by osimertinib, resulting in decreased expression of Bim and attenuated cytotoxicity of osimertinib. Taken together, we demonstrated that EFs suppressed the antitumor activity of osimertinib through AKT/FOXO3a/Bim pathway, and combination of PI3K/AKT inhibitor with osimertinib counteracted the effects of EFs. Our findings provided preliminary data for therapeutic strategies to enhance osimertinib efficacy in NSCLC patients.
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Affiliation(s)
- Li Li
- Department of Respiratory Disease, Daping Hospital, Army Medical University, Chongqing, China
| | - Chen Hu
- Department of Respiratory Disease, Daping Hospital, Army Medical University, Chongqing, China
| | - Conghua Lu
- Department of Respiratory Disease, Daping Hospital, Army Medical University, Chongqing, China
| | - Kejun Zhang
- Department of Clinical Laboratory, Daping Hospital, Army Medical University, Chongqing, China
| | - Rui Han
- Department of Respiratory Disease, Daping Hospital, Army Medical University, Chongqing, China
| | - Caiyu Lin
- Department of Respiratory Disease, Daping Hospital, Army Medical University, Chongqing, China
| | - Sanjun Zhao
- School of Life Sciences, Yunnan Normal University, Kunming, China
| | - Chunxian A
- School of Life Sciences, Yunnan Normal University, Kunming, China
| | | | - Min Zhao
- Department of Dermatology, Department of Ophthalmology, Institute for Regenerative Cures, University of California, Davis, CA, USA
| | - Yong He
- Department of Respiratory Disease, Daping Hospital, Army Medical University, Chongqing, China
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11
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Yao L, Shippy T, Li Y. Genetic analysis of the molecular regulation of electric fields-guided glia migration. Sci Rep 2020; 10:16821. [PMID: 33033380 PMCID: PMC7546725 DOI: 10.1038/s41598-020-74085-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 08/31/2020] [Indexed: 11/09/2022] Open
Abstract
In a developing nervous system, endogenous electric field (EF) influence embryonic growth. We reported the EF-directed migration of both rat Schwann cells (SCs) and oligodendrocyte precursor cells (OPCs) and explored the molecular mechanism using RNA-sequencing assay. However, previous studies revealed the differentially expressed genes (DEGs) associated with EF-guided migration of SCs or OPCs alone. In this study, we performed joint differential expression analysis on the RNA-sequencing data from both cell types. We report a number of significantly enriched gene ontology (GO) terms that are related to the cytoskeleton, cell adhesion, and cell migration. Of the DEGs associated with these terms, nine up-regulated DEGs and 32 down-regulated DEGs showed the same direction of effect in both SCs and OPCs stimulated with EFs, while the remaining DEGs responded differently. Thus, our study reveals the similarities and differences in gene expression and cell migration regulation of different glial cell types in response to EF stimulation.
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Affiliation(s)
- Li Yao
- Department of Biological Sciences, Wichita State University, 1845 Fairmount Street, Wichita, KS, 67260, USA.
| | - Teresa Shippy
- Bioinformatics Specialist, KSU Bioinformatics Center, Kansas State University, Manhattan, KS, 66506, USA
| | - Yongchao Li
- Department of Biological Sciences, Wichita State University, 1845 Fairmount Street, Wichita, KS, 67260, USA
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12
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Min Q, Parkinson DB, Dun XP. Migrating Schwann cells direct axon regeneration within the peripheral nerve bridge. Glia 2020; 69:235-254. [PMID: 32697392 DOI: 10.1002/glia.23892] [Citation(s) in RCA: 100] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 07/03/2020] [Accepted: 07/08/2020] [Indexed: 12/12/2022]
Abstract
Schwann cells within the peripheral nervous system possess a remarkable regenerative potential. Current research shows that peripheral nerve-associated Schwann cells possess the capacity to promote repair of multiple tissues including peripheral nerve gap bridging, skin wound healing, digit tip repair as well as tooth regeneration. One of the key features of the specialized repair Schwann cells is that they become highly motile. They not only migrate into the area of damaged tissue and become a key component of regenerating tissue but also secrete signaling molecules to attract macrophages, support neuronal survival, promote axonal regrowth, activate local mesenchymal stem cells, and interact with other cell types. Currently, the importance of migratory Schwann cells in tissue regeneration is most evident in the case of a peripheral nerve transection injury. Following nerve transection, Schwann cells from both proximal and distal nerve stumps migrate into the nerve bridge and form Schwann cell cords to guide axon regeneration. The formation of Schwann cell cords in the nerve bridge is key to successful peripheral nerve repair following transection injury. In this review, we first examine nerve bridge formation and the behavior of Schwann cell migration in the nerve bridge, and then discuss how migrating Schwann cells direct regenerating axons into the distal nerve. We also review the current understanding of signals that could activate Schwann cell migration and signals that Schwann cells utilize to direct axon regeneration. Understanding the molecular mechanism of Schwann cell migration could potentially offer new therapeutic strategies for peripheral nerve repair.
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Affiliation(s)
- Qing Min
- School of Pharmacy, Hubei University of Science and Technology, Xianning, Hubei Province, People's Republic of China
| | - David B Parkinson
- Peninsula Medical School, Faculty of Health, Plymouth University, Plymouth, Devon, UK
| | - Xin-Peng Dun
- School of Pharmacy, Hubei University of Science and Technology, Xianning, Hubei Province, People's Republic of China
- Peninsula Medical School, Faculty of Health, Plymouth University, Plymouth, Devon, UK
- The Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, People's Republic of China
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13
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Chen C, Bai X, Ding Y, Lee IS. Electrical stimulation as a novel tool for regulating cell behavior in tissue engineering. Biomater Res 2019; 23:25. [PMID: 31844552 PMCID: PMC6896676 DOI: 10.1186/s40824-019-0176-8] [Citation(s) in RCA: 185] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/27/2019] [Indexed: 12/18/2022] Open
Abstract
Recently, electrical stimulation as a physical stimulus draws lots of attention. It shows great potential in disease treatment, wound healing, and mechanism study because of significant experimental performance. Electrical stimulation can activate many intracellular signaling pathways, and influence intracellular microenvironment, as a result, affect cell migration, cell proliferation, and cell differentiation. Electrical stimulation is using in tissue engineering as a novel type of tool in regeneration medicine. Besides, with the advantages of biocompatible conductive materials coming into view, the combination of electrical stimulation with suitable tissue engineered scaffolds can well combine the benefits of both and is ideal for the field of regenerative medicine. In this review, we summarize the various materials and latest technologies to deliver electrical stimulation. The influences of electrical stimulation on cell alignment, migration and its underlying mechanisms are discussed. Then the effect of electrical stimulation on cell proliferation and differentiation are also discussed.
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Affiliation(s)
- Cen Chen
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018 People’s Republic of China
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Hangzhou, 310018 People’s Republic of China
| | - Xue Bai
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018 People’s Republic of China
| | - Yahui Ding
- Department of Cardiology, Zhejiang Provincial People’s Hospital, Hangzhou, 310014 People’s Republic of China
- People’s Hospital of Hangzhou Medical College, Hangzhou, 310014 People’s Republic of China
| | - In-Seop Lee
- Institute of Natural Sciences, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul, 03722 Republic of Korea
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14
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DC Electric Fields Induce Perpendicular Alignment and Enhanced Migration in Schwann Cell Cultures. Ann Biomed Eng 2019; 47:1584-1595. [PMID: 30963382 DOI: 10.1007/s10439-019-02259-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 03/29/2019] [Indexed: 12/30/2022]
Abstract
Schwann cells (SCs) are PNS glia that play numerous support functions including myelination of axons. After PNS injury, SCs facilitate regeneration by phagocytosing cellular debris and providing physical and biochemical cues to guide axon growth. This reparative phenotype suggests SCs could be critical cellular targets for enhancing nerve regeneration. One method for altering cell morphology and motility is the application of direct current (DC) electric fields (EFs). Endogenous EFs have physiologic relevance during embryogenesis and serve as guidance and polarization cues. While much literature exists on EFs and CNS and PNS neurons, the effects of EFs on SCs have not been extensively studied. In this work, cell alignment, migration, and morphology of rat SCs were measured in response to several EF stimulation regimes including constant DC, 50% duty cycle DC and oscillating DC. SCs were found to re-orient perpendicular to field lines and respond to DC EFs as low as 75 mV/mm. EF exposure promoted directed migration, with travel towards the cathode at a mean rate of 7.5 µm/h. The data highlight the utility of EFs in modulating SC morphology, alignment and migration. Results may have implications for using EFs to attract and realign SCs at the site of PNS trauma.
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15
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Electrotaxis of Glioblastoma and Medulloblastoma Spheroidal Aggregates. Sci Rep 2019; 9:5309. [PMID: 30926929 PMCID: PMC6441013 DOI: 10.1038/s41598-019-41505-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 02/26/2019] [Indexed: 11/08/2022] Open
Abstract
Treatment of neuroepithelial cancers remains a daunting clinical challenge, particularly due to an inability to address rampant invasion deep into eloquent regions of the brain. Given the lack of access, and the dispersed nature of brain tumor cells, we explore the possibility of electric fields inducing directed tumor cell migration. In this study we investigate the properties of populations of brain cancer undergoing electrotaxis, a phenomenon whereby cells are directed to migrate under control of an electrical field. We investigate two cell lines for glioblastoma and medulloblastoma (U87mg & DAOY, respectively), plated as spheroidal aggregates in Matrigel-filled electrotaxis channels, and report opposing electrotactic responses. To further understand electrotactic migration of tumor cells, we performed RNA-sequencing for pathway discovery to identify signaling that is differentially affected by the exposure of direct-current electrical fields. Further, using selective pharmacological inhibition assays, focused on the PI3K/mTOR/AKT signaling axis, we validate whether there is a causal relationship to electrotaxis and these mechanisms of action. We find that U87 mg electrotaxis is abolished under pharmacological inhibition of PI3Kγ, mTOR, AKT and ErbB2 signaling, whereas DAOY cell electrotaxis was not attenuated by these or other pathways evaluated.
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16
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Li J. Weak direct current (DC) electric fields as a therapy for spinal cord injuries: review and advancement of the oscillating field stimulator (OFS). Neurosurg Rev 2019; 42:825-834. [DOI: 10.1007/s10143-018-01068-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 11/07/2018] [Accepted: 12/07/2018] [Indexed: 12/14/2022]
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17
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Iwasa SN, Popovic MR, Morshead CM. Skin-derived precursor cells undergo substrate-dependent galvanotaxis that can be modified by neighbouring cells. Stem Cell Res 2018; 31:95-101. [PMID: 30059907 DOI: 10.1016/j.scr.2018.07.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 06/13/2018] [Accepted: 07/18/2018] [Indexed: 12/28/2022] Open
Abstract
Many cell types respond to electric fields (EFs) through cell migration, a process termed galvanotaxis. The galvanotactic response is critical for development and wound healing. Here we investigate whether skin-derived precursor cells (SKPs), which have the potential to differentiate into mesodermal and peripheral neural cell types, undergo directed migration in the presence of an EF. We found that EF application promotes SKP migration towards the anode. The migratory response is substrate-dependent as SKPs undergo directed migration on laminin and Matrigel, but not collagen. The majority of SKPs express the undifferentiated cell markers nestin, fibronectin and Sox2, after both EF application and in sister cultures with no EF application, suggesting that EFs do not promote cell differentiation. Co-cultures of SKPs and brain-derived neural precursor cells (NPCs), a population of cells that undergo rapid, cathode-directed migration, reveal that in the presence of NPCs an increased percentage of SKPs undergo galvanotaxis, providing evidence that cells can provide cues to modify the galvanotactic response. We propose that a better understanding of SKP migration in the presence of EFs may provide insight into improved strategies for wound repair.
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Affiliation(s)
- Stephanie N Iwasa
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3E1, Canada; Toronto Rehabilitation Institute - University Health Network, Toronto, Ontario M4G 3V9, Canada.
| | - Milos R Popovic
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3E1, Canada; Toronto Rehabilitation Institute - University Health Network, Toronto, Ontario M4G 3V9, Canada.
| | - Cindi M Morshead
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3E1, Canada; Toronto Rehabilitation Institute - University Health Network, Toronto, Ontario M4G 3V9, Canada; Department of Surgery, University of Toronto, Toronto, Ontario M5S 3E1, Canada.
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18
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Yao L, Li Y. The Role of Direct Current Electric Field-Guided Stem Cell Migration in Neural Regeneration. Stem Cell Rev Rep 2017; 12:365-75. [PMID: 27108005 DOI: 10.1007/s12015-016-9654-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Effective directional axonal growth and neural cell migration are crucial in the neural regeneration of the central nervous system (CNS). Endogenous currents have been detected in many developing nervous systems. Experiments have demonstrated that applied direct current (DC) electric fields (EFs) can guide axonal growth in vitro, and attempts have been made to enhance the regrowth of damaged spinal cord axons using DC EFs in in vivo experiments. Recent work has revealed that the migration of stem cells and stem cell-derived neural cells can be guided by DC EFs. These studies have raised the possibility that endogenous and applied DC EFs can be used to direct neural tissue regeneration. Although the mechanism of EF-directed axonal growth and cell migration has not been fully understood, studies have shown that the polarization of cell membrane proteins and the activation of intracellular signaling molecules are involved in the process. The application of EFs is a promising biotechnology for regeneration of the CNS.
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Affiliation(s)
- Li Yao
- Department of Biological Sciences, Wichita State University, Wichita, KS, 67260, USA.
| | - Yongchao Li
- Department of Biological Sciences, Wichita State University, Wichita, KS, 67260, USA
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19
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Li Y, Xu T, Zou H, Chen X, Sun D, Yang M. Cell migration microfluidics for electrotaxis-based heterogeneity study of lung cancer cells. Biosens Bioelectron 2016; 89:837-845. [PMID: 27816579 DOI: 10.1016/j.bios.2016.10.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Revised: 09/30/2016] [Accepted: 10/03/2016] [Indexed: 01/17/2023]
Abstract
Tumor metastasis involves the migration of cells from primary site to a distant location. Recently, it was established that cancer cells from the same tumor were heterogeneous in migratory ability. Numerous studies have demonstrated that cancer cells undergo reorientation and migration directionally under physiological electric field (EF), which has potential implications in metastasis. Microfluidic devices with channel structures of defined dimensions provide controllable microenvironments to enable real-time observation of cell migration. In this study, we developed two polydimethylsiloxane (PDMS)-based microfluidic devices for long-term electrotaxis study. In the first chip, three different intensities of EFs were generated in a single channel to study cell electrotactic behavior with high efficiency. We observed that the lung adenocarcinoma H1975 cells underwent cathodal migration with changing cellular orientation. To address the issue of cell electrotactic heterogeneity, we also developed a cell isolation device integrating cell immobilization structure, stable EF generator and cell retrieval module in one microfluidic chip to sort out different cell subpopulations based on electrotactic ability. High electrotactic and low electrotactic cells were harvested separately for colony formation assay and transcriptional analysis of migration-related genes. The results showed that H1975 cell motility was related to EGFR expression in the absence of EF stimulation, while in the presence of EF it was associated with PTEN expression. Up-regulation of RhoA was observed in cells with high motility, regardless of EF. The easy cell manipulation and precise field control of the microfluidic devices may enable further study of tumor heterogeneity in complex electrotactic environments.
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Affiliation(s)
- Yaping Li
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China; Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen, Research Institutes of City University of Hong Kong, Shenzhen, China
| | - Tao Xu
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China; Liaoning Medical University, Jinzhou, Liaoning, China
| | - Heng Zou
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China; Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen, Research Institutes of City University of Hong Kong, Shenzhen, China
| | - Xiaomei Chen
- Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen, Research Institutes of City University of Hong Kong, Shenzhen, China
| | - Dong Sun
- Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China
| | - Mengsu Yang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China; Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen, Research Institutes of City University of Hong Kong, Shenzhen, China.
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20
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Seyedhassantehrani N, Li Y, Yao L. Dynamic behaviors of astrocytes in chemically modified fibrin and collagen hydrogels. Integr Biol (Camb) 2016; 8:624-34. [PMID: 27079938 PMCID: PMC4868780 DOI: 10.1039/c6ib00003g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Astrocytes play a critical role in supporting the normal physiological function of neurons in the central nervous system (CNS). Astrocyte transplantation can potentially promote axonal regeneration and functional recovery after spinal cord injury (SCI). Fibrin and collagen hydrogels provide growth-permissive substrates and serve as carriers for therapeutic cell transplantation into an injured spinal cord. However, the application of fibrin and collagen hydrogels may be limited due to their relatively rapid degradation rate in vivo. In this study, immature astrocytes isolated from neonatal rats were grown in fibrin hydrogels containing aprotinin and collagen hydrogels crosslinked with poly(ethylene glycol) ether tetrasuccinimidyl glutarate (4S-StarPEG), and the cell behavior in these hydrogels was studied. The cell viability of astrocytes in the hydrogels was tested using the LIVE/DEAD® assay and the AlamarBlue® assay, and this study showed that astrocytes maintained good viability in these hydrogels. The cell migration study showed that astrocytes migrated in the fibrin and collagen hydrogels, and the migration speed is similar in these hydrogels. The crosslinking of collagen hydrogels with 4S-StarPEG did not change the astrocyte migration speed. However, the addition of aprotinin in the fibrin hydrogel inhibited astrocyte migration. The expression of chondroitin sulfate proteoglycan (CSPG), including NG2, neurocan, and versican, by astrocytes grown in the hydrogels was analyzed by quantitative RT-PCR. The expression of NG2, neurocan, and versican by the cells in these hydrogels was not significantly different.
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Affiliation(s)
- Negar Seyedhassantehrani
- Department of Biological Sciences, Wichita State University, Fairmount 1845, Wichita, KS 67260, USA.
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21
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Lee D, Jeong DE, Son HG, Yamaoka Y, Kim H, Seo K, Khan AA, Roh TY, Moon DW, Lee Y, Lee SJV. SREBP and MDT-15 protect C. elegans from glucose-induced accelerated aging by preventing accumulation of saturated fat. Genes Dev 2015; 29:2490-503. [PMID: 26637528 PMCID: PMC4691952 DOI: 10.1101/gad.266304.115] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 11/05/2015] [Indexed: 11/25/2022]
Abstract
Glucose-rich diets shorten the life spans of various organisms. However, the metabolic processes involved in this phenomenon remain unknown. Here, we show that sterol regulatory element-binding protein (SREBP) and mediator-15 (MDT-15) prevent the life-shortening effects of a glucose-rich diet by regulating fat-converting processes in Caenorhabditis elegans. Up-regulation of the SREBP/MDT-15 transcription factor complex was necessary and sufficient for alleviating the life-shortening effect of a glucose-rich diet. Glucose feeding induced key enzymes that convert saturated fatty acids (SFAs) to unsaturated fatty acids (UFAs), which are regulated by SREBP and MDT-15. Furthermore, SREBP/MDT-15 reduced the levels of SFAs and moderated glucose toxicity on life span. Our study may help to develop strategies against elevated blood glucose and free fatty acids, which cause glucolipotoxicity in diabetic patients.
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Affiliation(s)
- Dongyeop Lee
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Dae-Eun Jeong
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Heehwa G Son
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Yasuyo Yamaoka
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Hyunmin Kim
- Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, South Korea
| | - Keunhee Seo
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Abdul Aziz Khan
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Tae-Young Roh
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea; Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Dae Won Moon
- Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, South Korea
| | - Youngsook Lee
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea; Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
| | - Seung-Jae V Lee
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea; Information Technology Convergence Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea; School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, South Korea
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22
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Li Y, Wang X, Yao L. Directional migration and transcriptional analysis of oligodendrocyte precursors subjected to stimulation of electrical signal. Am J Physiol Cell Physiol 2015; 309:C532-40. [PMID: 26269459 DOI: 10.1152/ajpcell.00175.2015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 08/05/2015] [Indexed: 12/28/2022]
Abstract
Loss of oligodendrocytes as the result of central nervous system disease causes demyelination that impairs axon function. Effective directional migration of endogenous or grafted oligodendrocyte precursor cells (OPCs) to a lesion is crucial in the neural remyelination process. In this study, the migration of OPCs in electric fields (EFs) was investigated. We found that OPCs migrated anodally in applied EFs, and the directedness and displacement of anodal migration increased significantly when the EF strength increased from 50 to 200 mV/mm. However, EFs did not significantly affect the cell migration speed. The transcriptome of OPCs subjected to EF stimulation (100 and 200 mV/mm) was analyzed using RNA sequencing (RNA-Seq), and results were verified by the reverse transcription quantitative polymerase chain reaction. A Kyoto Encyclopedia of Genes and Genomes pathway analysis revealed that the mitogen-activated protein kinase pathway that signals cell migration was significantly upregulated in cells treated with an EF of 200 mV/mm compared with control cells. Gene ontology enrichment analysis showed the downregulation of differentially expressed genes in chemotaxis. This study suggests that an applied EF is an effective cue to guiding OPC migration in neural regeneration and that transcriptional analysis contributes to the understanding of the mechanism of EF-guided cell migration.
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Affiliation(s)
- Yongchao Li
- Department of Biological Sciences, Wichita State University, Wichita, Kansas; and
| | - Xinkun Wang
- Genome Sequencing Core and Genomics Facility, University of Kansas, Lawrence, Kansas
| | - Li Yao
- Department of Biological Sciences, Wichita State University, Wichita, Kansas; and
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