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Solomatina ES, Kovaleva AV, Tvorogova AV, Vorobjev IA, Saidova AA. Effect of Focal Adhesion Kinase and Vinculin Expression on Migration Parameters of Normal and Tumor Epitheliocytes. BIOCHEMISTRY. BIOKHIMIIA 2024; 89:474-486. [PMID: 38648767 DOI: 10.1134/s0006297924030088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/11/2024] [Accepted: 01/17/2024] [Indexed: 04/25/2024]
Abstract
Focal adhesions (FAs) are mechanosensory structures that transform physical stimuli into chemical signals guiding cell migration. Comprehensive studies postulate correlation between the FA parameters and cell motility metrics for individual migrating cells. However, which properties of the FAs are critical for epithelial cell motility in a monolayer remains poorly elucidated. We used high-throughput microscopy to describe relationship between the FA parameters and cell migration in immortalized epithelial keratinocytes (HaCaT) and lung carcinoma cells (A549) with depleted or inhibited vinculin and focal adhesion kinase (FAK) FA proteins. To evaluate relationship between the FA morphology and cell migration, we used substrates with varying stiffness in the model of wound healing. Cells cultivated on fibronectin had the highest FA area values, migration rate, and upregulated expression of FAK and vinculin mRNAs, while the smallest FA area and slower migration rate to the wound were specific to cells cultivated on glass. Suppression of vinculin expression in both normal and tumor cells caused decrease of the FA size and fluorescence intensity but did not affect cell migration into the wound. In contrast, downregulation or inactivation of FAK did not affect the FA size but significantly slowed down the wound closure rate by both HaCaT and A549 cell lines. We also showed that the FAK knockdown results in the FA lifetime decrease for the cells cultivated both on glass and fibronectin. Our data indicate that the FA lifetime is the most important parameter defining migration of epithelial cells in a monolayer. The observed change in the cell migration rate in a monolayer caused by changes in expression/activation of FAK kinase makes FAK a promising target for anticancer therapy of lung carcinoma.
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Affiliation(s)
- Evgenia S Solomatina
- Lomonosov Moscow State University, Department of Biology, Moscow, 119991, Russia
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Anastasia V Kovaleva
- Lomonosov Moscow State University, Department of Biology, Moscow, 119991, Russia
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
| | - Anna V Tvorogova
- Lomonosov Moscow State University, Department of Biology, Moscow, 119991, Russia
- Belozersky Research Institute of Physico-Chemical Biology, Moscow, 119991, Russia
| | - Ivan A Vorobjev
- Lomonosov Moscow State University, Department of Biology, Moscow, 119991, Russia
| | - Aleena A Saidova
- Lomonosov Moscow State University, Department of Biology, Moscow, 119991, Russia.
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
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Toledo E, Iraqi M, Pandey A, Tzadka S, Le Saux G, Porgador A, Schvartzman M. Multifunctional Nanoscale Platform for the Study of T Cell Receptor Segregation. ACS OMEGA 2023; 8:28968-28975. [PMID: 37599975 PMCID: PMC10433356 DOI: 10.1021/acsomega.2c08194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 05/10/2023] [Indexed: 08/22/2023]
Abstract
T cells respond not only to biochemical stimuli transmitted through their activating, costimulatory, and inhibitory receptors but also to biophysical aspects of their environment, including the receptors' spatial arrangement. While these receptors form nanoclusters that can either colocalize or segregate, the roles of these colocalization and segregation remain unclear. Deciphering these roles requires a nanoscale platform with independent and simultaneous spatial control of multiple types of receptors. Herein, using a straightforward and modular fabrication process, we engineered a tunable nanoscale chip used as a platform for T cell stimulation, allowing spatial control over the clustering and segregation of activating, costimulatory, and inhibitory receptors. Using this platform, we showed that, upon blocked inhibition, cells became sensitive to changes in the nanoscale ligand configuration. The nanofabrication methodology described here opens a pathway to numerous studies, which will produce an important insight into the molecular mechanism of T cell activation. This insight is essential for the fundamental understanding of our immune system as well as for the rational design of future immunotherapies.
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Affiliation(s)
- Esti Toledo
- Department
of Materials Engineering, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
- Ilse
Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Muhammed Iraqi
- The
Shraga Segal Department of Microbiology, Immunology, and Genetics,
Faculty of Health Science, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
| | - Ashish Pandey
- Department
of Materials Engineering, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
- Ilse
Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Sivan Tzadka
- Department
of Materials Engineering, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
- Ilse
Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Guillaume Le Saux
- Department
of Materials Engineering, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
- Ilse
Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Angel Porgador
- The
Shraga Segal Department of Microbiology, Immunology, and Genetics,
Faculty of Health Science, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
| | - Mark Schvartzman
- Department
of Materials Engineering, Ben-Gurion University
of the Negev, Beer-Sheva 8410501, Israel
- Ilse
Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
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Sarhane KA, Qiu C, Harris TG, Hanwright PJ, Mao HQ, Tuffaha SH. Translational bioengineering strategies for peripheral nerve regeneration: opportunities, challenges, and novel concepts. Neural Regen Res 2022; 18:1229-1234. [PMID: 36453398 PMCID: PMC9838159 DOI: 10.4103/1673-5374.358616] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Peripheral nerve injuries remain a challenging problem in need of better treatment strategies. Despite best efforts at surgical reconstruction and postoperative rehabilitation, patients are often left with persistent, debilitating motor and sensory deficits. There are currently no therapeutic strategies proven to enhance the regenerative process in humans. A clinical need exists for the development of technologies to promote nerve regeneration and improve functional outcomes. Recent advances in the fields of tissue engineering and nanotechnology have enabled biomaterial scaffolds to modulate the host response to tissue repair through tailored mechanical, chemical, and conductive cues. New bioengineered approaches have enabled targeted, sustained delivery of protein therapeutics with the capacity to unlock the clinical potential of a myriad of neurotrophic growth factors that have demonstrated promise in enhancing regenerative outcomes. As such, further exploration of combinatory strategies leveraging these technological advances may offer a pathway towards clinically translatable solutions to advance the care of patients with peripheral nerve injuries. This review first presents the various emerging bioengineering strategies that can be applied for the management of nerve gap injuries. We cover the rationale and limitations for their use as an alternative to autografts, focusing on the approaches to increase the number of regenerating axons crossing the repair site, and facilitating their growth towards the distal stump. We also discuss the emerging growth factor-based therapeutic strategies designed to improve functional outcomes in a multimodal fashion, by accelerating axonal growth, improving the distal regenerative environment, and preventing end-organs atrophy.
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Affiliation(s)
- Karim A. Sarhane
- Department of Plastic and Reconstructive Surgery, Peripheral Nerve Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Chenhu Qiu
- Department of Materials Science and Engineering, Johns Hopkins University Whiting School of Engineering, Baltimore, MD, USA,Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA,Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Thomas G.W. Harris
- Department of Plastic and Reconstructive Surgery, Peripheral Nerve Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Philip J. Hanwright
- Department of Plastic and Reconstructive Surgery, Peripheral Nerve Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hai-Quan Mao
- Department of Materials Science and Engineering, Johns Hopkins University Whiting School of Engineering, Baltimore, MD, USA,Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA,Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sami H. Tuffaha
- Department of Plastic and Reconstructive Surgery, Peripheral Nerve Research Laboratory, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Correspondence to: Sami H. Tuffaha, .
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Das P, Jana S, Kumar Nandi S. Biomaterial-Based Therapeutic Approaches to Osteoarthritis and Cartilage Repair Through Macrophage Polarization. CHEM REC 2022; 22:e202200077. [PMID: 35792527 DOI: 10.1002/tcr.202200077] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 06/15/2022] [Indexed: 11/06/2022]
Abstract
There is an ever-increasing clinical and socioeconomic burden associated with cartilage lesions & osteoarthritis (OA). Its progression, chondrocyte death & hypertrophy are all facilitated by inflamed synovium & joint environment. Due to their capacity to switch between pro- & anti-inflammatory phenotypes, macrophages are increasingly being recognized as a key player in the healing process, which has been largely overlooked in the past. A biomaterial's inertness has traditionally been a goal while developing them in order to reduce the likelihood of adverse reactions from the host organism. A better knowledge of how macrophages respond to implanted materials has made it feasible to determine the biomaterial architectural parameters that control the host response & aid in effective tissue integration. Thus, this review summarizes novel therapeutic techniques for avoiding OA or increasing cartilage repair & regeneration that might be developed using new technologies tuning macrophages into desirable functional phenotypes.
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Affiliation(s)
- Piyali Das
- Department of Microbiology, School of Life Science and Biotechnology, Adamas University, Kolkata, 700126, India
| | - Sonali Jana
- Department of Veterinary Physiology, West Bengal University of Animal and Fishery Sciences, 700037, Kolkata, India
| | - Samit Kumar Nandi
- Department of Veterinary Surgery and Radiology, West Bengal University of Animal and Fishery Sciences, 700037, Kolkata, India
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Legerstee K, Houtsmuller AB. A Layered View on Focal Adhesions. BIOLOGY 2021; 10:biology10111189. [PMID: 34827182 PMCID: PMC8614905 DOI: 10.3390/biology10111189] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/06/2021] [Accepted: 11/08/2021] [Indexed: 12/31/2022]
Abstract
Simple Summary The cytoskeleton is a network of protein fibres within cells that provide structure and support intracellular transport. Focal adhesions are protein complexes associated with the outer cell membrane that are found at the ends of specialised actin fibres of this cytoskeleton. They mediate cell adhesion by connecting the cytoskeleton to the extracellular matrix, a protein and sugar network that surrounds cells in tissues. Focal adhesions also translate forces on actin fibres into forces contributing to cell migration. Cell adhesion and migration are crucial to diverse biological processes such as embryonic development, proper functioning of the immune system or the metastasis of cancer cells. Advances in fluorescence microscopy and data analysis methods provided a more detailed understanding of the dynamic ways in which proteins bind and dissociate from focal adhesions and how they are organised within these protein complexes. In this review, we provide an overview of the advances in the current scientific understanding of focal adhesions and summarize relevant imaging techniques. One of the key insights is that focal adhesion proteins are organised into three layers parallel to the cell membrane. We discuss the relevance of this layered nature for the functioning of focal adhesion. Abstract The cytoskeleton provides structure to cells and supports intracellular transport. Actin fibres are crucial to both functions. Focal Adhesions (FAs) are large macromolecular multiprotein assemblies at the ends of specialised actin fibres linking these to the extracellular matrix. FAs translate forces on actin fibres into forces contributing to cell migration. This review will discuss recent insights into FA protein dynamics and their organisation within FAs, made possible by advances in fluorescence imaging techniques and data analysis methods. Over the last decade, evidence has accumulated that FAs are composed of three layers parallel to the plasma membrane. We focus on some of the most frequently investigated proteins, two from each layer, paxillin and FAK (bottom, integrin signalling layer), vinculin and talin (middle, force transduction layer) and zyxin and VASP (top, actin regulatory layer). Finally, we discuss the potential impact of this layered nature on different aspects of FA behaviour.
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Zheng T, Abadi PPSS, Seo J, Cha BH, Miccoli B, Li YC, Park K, Park S, Choi SJ, Bayaniahangar R, Zhang D, Lee SH, Lee CK, Khademhosseini A, Shin SR. Biocompatible Carbon Nanotube-Based Hybrid Microfiber for Implantable Electrochemical Actuator and Flexible Electronic Applications. ACS APPLIED MATERIALS & INTERFACES 2019; 11:20615-20627. [PMID: 31050404 PMCID: PMC6660641 DOI: 10.1021/acsami.9b02927] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Biocompatible, electrically conductive microfibers with superior mechanical properties have received a great attention due to their potential applications in various biomedical applications such as implantable medical devices, biosensors, artificial muscles, and microactuators. Here, we developed an electrically conductive and mechanically stable carbon nanotube-based microactuator with a low degradability that makes it usable for an implantable device in the body or biological environments. The microfiber was composed of hyaluronic acid (HA) hydrogel and single-wall carbon nanotubes (SWCNTs) (HA/SWCNT). HA hydrogel acts as biosurfactant and ion-conducting binder to improve the dispersion of SWCNTs resulting in enhanced electrical and mechanical properties of the hybrid microfiber. In addition, HA was crosslinked to prevent the leaking of the nanotubes from the composite. Crosslinking of HA hydrogel significantly enhances Young's modulus, the failure strain, the toughness, the stability of the electrical conductivity, and the resistance to biodegradation and creep of hybrid microfibers. The obtained crosslinked HA/SWCNT hybrid microfibers show an excellent capacitance and actuation behavior under mechanical loading with a low potential of ±1 V in a biological environment. Furthermore, the HA/SWCNT microfibers exhibit an excellent in vitro viability. Finally, the biocompatibility is shown through the resolution of an early inflammatory response in less than 3 weeks after the implantation of the microfibers in the subcutaneous tissue of mice.
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Affiliation(s)
- Ting Zheng
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- School of Materials Science and Engineering, Harbin Institute of Technology, 150001, China
| | - Parisa Pour Shahid Saeed Abadi
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Jungmok Seo
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Byung-Hyun Cha
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Biomedical Science, CHA University, 13488, Republic of Korea
| | - Beatrice Miccoli
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Electronics and Telecommunications, Politecnico di Torino, Torino, 10129, Italy
| | - Yi-Chen Li
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Kijun Park
- School of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Sunghyun Park
- Department of Biomedical Science, CHA University, 13488, Republic of Korea
| | - Seon-Ji Choi
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Rasoul Bayaniahangar
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, USA
| | - Dongxing Zhang
- School of Materials Science and Engineering, Harbin Institute of Technology, 150001, China
| | - Soo-Hong Lee
- Department of Biomedical Science, CHA University, 13488, Republic of Korea
| | - Chang-Kee Lee
- Korea Packaging Center, Korea Institute of Industrial Technology, Bucheon, Gyeonggi-do 14449, South Korea
| | - Ali Khademhosseini
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Bioengineering, Department of Chemical and Biomolecular Engineering, Henry Samueli School of Engineering and Applied Sciences, University of California-Los Angeles, Los Angeles, CA 90095, USA
- California NanoSystems Institute (CNSI), University of California-Los Angeles, Los Angeles, CA 90095, USA
- Department of Bioindustrial Technologies, College of Animal Bioscience and Technology, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
- Center of Nanotechnology, Department of Physics, King Abdulaziz University, Jeddah 21569, Saudi Arabia
| | - Su Ryon Shin
- Division of Engineering in Medicine, Department of Medicine, Brigham Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Sarhane KA, Ibrahim Z, Martin R, Krick K, Cashman CR, Tuffaha SH, Broyles JM, Prasad N, Yao ZC, Cooney DS, Mi R, Lee WPA, Hoke A, Mao HQ, Brandacher G. Macroporous nanofiber wraps promote axonal regeneration and functional recovery in nerve repair by limiting fibrosis. Acta Biomater 2019; 88:332-345. [PMID: 30807875 DOI: 10.1016/j.actbio.2019.02.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 02/14/2019] [Accepted: 02/22/2019] [Indexed: 12/19/2022]
Abstract
Functional outcomes following nerve repair remain suboptimal. Scarring at the repair site is a major impediment to regeneration. A biomaterial scaffold applied around the coaptation site that decreases inflammation holds great potential in reducing scarring, enhancing axonal growth, and improving functional recovery. In this study, we evaluated the effect of a macroporous nanofiber wrap, comprised of nonwoven electrospun poly-ε-caprolactone (PCL), in improving axonal regeneration in a rat sciatic nerve cut and direct repair model. Controls consisted of conventional epineurial repair. We also evaluated our wrap against the commercially available AxoGuard wrap. At five weeks following repair, the nanofiber wrap group showed a significantly decreased intraneural macrophage invasion and collagen deposition at the repair site. This was associated with increased expression of the anti-inflammatory cytokine (IL-10), decreased expression of the pro-inflammatory cytokine (TNF-α), and a decrease in the M1:M2 macrophage phenotype ratio. These findings suggest that this nanofiber wrap, with its unique macroporosity, is modulating the inflammatory response at the repair site by polarizing macrophages towards a pro-regenerative M2 phenotype. Concomitantly, a higher number of regenerated axons was noted. At sixteen weeks, the nanofiber wrap resulted in enhanced functional recovery as demonstrated by electrophysiology, neuromuscular re-innervation, and muscle histology. When compared to the AxoGuard wrap, the nanofiber wrap showed similar inflammation at the repair site and similar nerve morphometric findings, but there was a trend towards a lower overall number of macrophages invading the wrap wall. These results demonstrate favorable outcomes of the macroporous nanofiber wrap in promoting neuroregeneration and functional recovery following nerve repair. STATEMENT OF SIGNIFICANCE: Electrospun nanofiber scaffolds, with specific fiber and pore sizes, were shown to modulate the immune response and create a regenerative environment. In this paper, we present a macroporous nanofiber wrap, made of poly-ε-caprolactone, to be applied at the coaptation site in primary nerve repair. We show that it regulates the inflammatory response at the repair site and decreases scarring/fibrosis. This results in enhanced axonal regeneration, allowing a higher number of axons to cross the suture line and reach the target muscle in a timely fashion. Functional outcomes are thus improved.
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Le Saux G, Schvartzman M. Advanced Materials and Devices for the Regulation and Study of NK Cells. Int J Mol Sci 2019; 20:E646. [PMID: 30717370 PMCID: PMC6386824 DOI: 10.3390/ijms20030646] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 01/24/2019] [Accepted: 01/29/2019] [Indexed: 02/07/2023] Open
Abstract
Natural Killer (NK) cells are innate lymphocytes that contribute to immune protection by cytosis, cytokine secretion, and regulation of adaptive responses of T cells. NK cells distinguish between healthy and ill cells, and generate a cytotoxic response, being cumulatively regulated by environmental signals delivered through their diverse receptors. Recent advances in biomaterials and device engineering paved the way to numerous artificial microenvironments for cells, which produce synthetic signals identical or similar to those provided by the physiological environment. In this paper, we review recent advances in materials and devices for artificial signaling, which have been applied to regulate NK cells, and systematically study the role of these signals in NK cell function.
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Affiliation(s)
- Guillaume Le Saux
- Department of Materials Engineering, Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.
| | - Mark Schvartzman
- Department of Materials Engineering, Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.
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9
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Adutler-Lieber S, Friedman N, Geiger B. Expansion and Antitumor Cytotoxicity of T-Cells Are Augmented by Substrate-Bound CCL21 and Intercellular Adhesion Molecule 1. Front Immunol 2018; 9:1303. [PMID: 29942308 PMCID: PMC6004589 DOI: 10.3389/fimmu.2018.01303] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 05/25/2018] [Indexed: 12/31/2022] Open
Abstract
Adoptive immunotherapy is based on ex vivo expansion and stimulation of T-cells, followed by their transfer into patients. The need for the ex vivo culturing step provides opportunities for modulating the properties of transferred T-cells, enhancing their antitumor abilities, and increasing their number. Here, we present a synthetic immune niche (SIN) that increases the number and antitumor activity of cytotoxic CD8+ T-cells. We first evaluated the effect of various SIN compositions that mimic the physiological microenvironment encountered by T-cells during their activation and expansion in the lymph node. We found that substrates coated with the chemokine CCL21 together with the adhesion molecule intercellular adhesion molecule 1 significantly increase the number of ovalbumin-specific murine CD8+ T-cells activated by antigen-loaded dendritic cells or activation microbeads. Notably, cells cultured on these substrates also displayed augmented cytotoxic activity toward ovalbumin-expressing melanoma cells, both in culture and in vivo. This increase in specific cytotoxic activity was associated with a major increase in the cellular levels of the killing-mediator granzyme B. Our results suggest that this SIN may be used for generating T-cells with augmented cytotoxic function, for use in cancer immunotherapy.
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Affiliation(s)
| | - Nir Friedman
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Benjamin Geiger
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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10
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de la Zerda A, Kratochvil MJ, Suhar NA, Heilshorn SC. Review: Bioengineering strategies to probe T cell mechanobiology. APL Bioeng 2018; 2:021501. [PMID: 31069295 PMCID: PMC6324202 DOI: 10.1063/1.5006599] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 01/29/2018] [Indexed: 01/08/2023] Open
Abstract
T cells play a major role in adaptive immune response, and T cell dysfunction can lead to the progression of several diseases that are often associated with changes in the mechanical properties of tissues. However, the concept that mechanical forces play a vital role in T cell activation and signaling is relatively new. The endogenous T cell microenvironment is highly complex and dynamic, involving multiple, simultaneous cell-cell and cell-matrix interactions. This native complexity has made it a challenge to isolate the effects of mechanical stimuli on T cell activation. In response, researchers have begun developing engineered platforms that recapitulate key aspects of the native microenvironment to dissect these complex interactions in order to gain a better understanding of T cell mechanotransduction. In this review, we first describe some of the unique characteristics of T cells and the mounting research that has shown they are mechanosensitive. We then detail the specific bioengineering strategies that have been used to date to measure and perturb the mechanical forces at play during T cell activation. In addition, we look at engineering strategies that have been used successfully in mechanotransduction studies for other cell types and describe adaptations that may make them suitable for use with T cells. These engineering strategies can be classified as 2D, so-called 2.5D, or 3D culture systems. In the future, findings from this emerging field will lead to an optimization of culture environments for T cell expansion and the development of new T cell immunotherapies for cancer and other immune diseases.
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Affiliation(s)
- Adi de la Zerda
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
| | | | - Nicholas A Suhar
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
| | - Sarah C Heilshorn
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
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11
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Correia CR, Gaifem J, Oliveira MB, Silvestre R, Mano JF. The influence of surface modified poly(l-lactic acid) films on the differentiation of human monocytes into macrophages. Biomater Sci 2018; 5:551-560. [PMID: 28128374 DOI: 10.1039/c6bm00920d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Macrophages play a crucial role in the biological performance of biomaterials, as key factors in defining the optimal inflammation-healing balance towards tissue regeneration and implant integration. Here, we investigate how different surface modifications performed on poly(l-lactic acid) (PLLA) films would influence the differentiation of human monocytes into macrophages. We tested PLLA films without modification, surface-modified by plasma treatment (pPLLA) or by combining plasma treatment with different coating materials, namely poly(l-lysine) and a series of proteins from the extracellular matrix: collagen I, fibronectin, vitronectin, laminin and albumin. While all the tested films are non-cytotoxic, differences in cell adhesion and morphology are observed. Monocyte-derived macrophages (MDM) present a more rounded shape in non-modified films, while a more elongated phenotype is observed containing filopodia-like and podosome-like structures in all modified films. No major differences are found for the expression of HLA-DR+/CD80+ and CD206+/CD163+ surface markers, as well as for the ability of MDM to phagocytize. Interestingly, MDM differentiated on pPLLA present the highest expression of MMP9. Upon differentiation, MDM in all surface modified films present lower amounts of IL-6 and IL-10 compared to non-modified films. After stimulating MDM with the potent pro-inflammatory agent LPS, pPLLA and poly(l-lysine) and fibronectin-modified films reveal a significant reduction in IL-6 secretion, while the opposite effect is observed with IL-10. Of note, in comparison to non-modified films, all surface modified films induce a significant reduction of the IL-6/IL-10 ratio, a valuable prognosticator of the pro- versus anti-inflammatory balance. These findings provide important insights into MDM-biomaterial interactions, while strengthening the need for designing immune-informed biomaterials.
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Affiliation(s)
- Clara R Correia
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4805-017 Barco, Guimarães, Portugal. and ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| | - Joana Gaifem
- ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal. and Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Mariana B Oliveira
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4805-017 Barco, Guimarães, Portugal. and ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| | - Ricardo Silvestre
- ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal. and Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - João F Mano
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4805-017 Barco, Guimarães, Portugal. and ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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12
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Abstract
Cancer immunotherapy can successfully promote long-term anticancer immune responses, although there is still only a limited number of patients who benefit from such treatment, and it can sometimes have severe treatment-associated adverse events. Compared with systemic immunomodulation, local immunomodulation may enable more effective treatment at lower doses and, at the same time, prevent systemic toxicity. Local delivery of engineered three-dimensional scaffolds may fulfil this role by acting as synthetic immune niches that boost anticancer immunity. In this Opinion article, we highlight the potential of scaffold-based adoptive cell transfer and scaffold-based cancer vaccines that, although applied locally, can promote systemic antitumour immunity. Furthermore, we discuss how scaffold-based cancer immunotherapy may contribute to the development of the next generation of cancer treatments.
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13
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Substrate-bound CCL21 and ICAM1 combined with soluble IL-6 collectively augment the expansion of antigen-specific murine CD4 + T cells. Blood Adv 2017; 1:1016-1030. [PMID: 29296744 DOI: 10.1182/bloodadvances.2016001545] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 05/13/2017] [Indexed: 01/24/2023] Open
Abstract
Immune processes within the complex microenvironment of the lymph node involve multiple intercellular, cell-matrix, and paracrine interactions, resulting in the expansion of antigen-specific T cells. Inspired by the lymph node microenvironment, we aimed to develop an ex vivo "synthetic immune niche" (SIN), which could effectively stimulate the proliferation of antigen-activated CD4+ T cells. This engineered SIN consisted of surfaces coated with the chemokine C-C motif ligand 21 (CCL21) and with the intercellular adhesion molecule 1 (ICAM1), coupled with the soluble cytokine interleukin 6 (IL-6) added to the culture medium. When activated by ovalbumin-loaded dendritic cells, OT-II T cells growing on regular uncoated culture plates form nonadherent, dynamic clusters around the dendritic cells. We found that functionalization of the plate surface with CCL21 and ICAM1 and the addition of IL-6 to the medium dramatically increases T-cell proliferation and transforms the culture topology from that of suspended 3-dimensional cell clusters into a firm, substrate-attached monolayer of cells. Our findings demonstrate that the components of this SIN collectively modulate T-cell interactions and augment both the proliferation and survival of T cells in an antigen-specific manner, potentially serving as a powerful approach for expanding immunotherapeutic T cells.
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14
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Yesildag C, Tyushina A, Lensen M. Nano-Contact Transfer with Gold Nanoparticles on PEG Hydrogels and Using Wrinkled PDMS-Stamps. Polymers (Basel) 2017; 9:E199. [PMID: 30970878 PMCID: PMC6432311 DOI: 10.3390/polym9060199] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 05/13/2017] [Accepted: 05/17/2017] [Indexed: 11/22/2022] Open
Abstract
In the present work, a soft lithographic process is used to create nanometer-sized line patterns of gold nanoparticles (Au NPs) on PEG-based hydrogels. Hereby nanometer-sized wrinkles on polydimethylsiloxane (PDMS) are first fabricated, then functionalized with amino-silane and subsequently coated with Au NPs. The Au NPs are electrostatically bound to the surface of the wrinkled PDMS. In the next step, these relatively loosely bound Au NPs are transferred to PEG based hydrogels by simple contacting, which we denote "nano-contact transfer". Nano-patterned Au NPs lines on PEG hydrogels are thus achieved, which are of interesting potential in nano-photonics, biosensor applications (using SERS) and to control nanoscopic cell adhesion events.
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Affiliation(s)
- Cigdem Yesildag
- Technische Universität Berlin, Nanopatterned Biomaterials, Sekr. TC 1, Strasse des 17. Juni 124, 10623 Berlin, Germany.
| | - Arina Tyushina
- Technische Universität Berlin, Nanopatterned Biomaterials, Sekr. TC 1, Strasse des 17. Juni 124, 10623 Berlin, Germany.
| | - Marga Lensen
- Technische Universität Berlin, Nanopatterned Biomaterials, Sekr. TC 1, Strasse des 17. Juni 124, 10623 Berlin, Germany.
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15
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Jasti AK, Selmi C, Sarmiento-Monroy JC, Vega DA, Anaya JM, Gershwin ME. Guillain-Barré syndrome: causes, immunopathogenic mechanisms and treatment. Expert Rev Clin Immunol 2016. [DOI: 10.1080/1744666x.2016.1193006 10.1080/1744666x.2016.1193006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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16
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Geiger B, Spatz J. Application of synthetic biology approaches for understanding encounters between cells and their microenvironment. Cell Adh Migr 2016; 10:447-450. [PMID: 27442709 DOI: 10.1080/19336918.2016.1215184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Benjamin Geiger
- a Department of Molecular Cell Biology Weizmann Institute of Science , Rehovot , Israel
| | - Joachim Spatz
- b Department of Biointerphase Science & Technology Max Planck Institute for Medical Research Jahnstraße, Heidelberg, Germany Laboratory of Biophysical Chemistry Institute of Physical Chemistry, University of Heidelberg Im Neuenheimer Feld, Heidelberg , Germany
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17
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Weigelin B, Friedl P. Cancer cells: Stemness shaped by curvature. NATURE MATERIALS 2016; 15:827-828. [PMID: 27443907 DOI: 10.1038/nmat4711] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- Bettina Weigelin
- David H. Koch Center for Applied Research of Genitourinary Cancers, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA and in the Department of Cell Biology, Radboud University Medical Centre, 6525GA Nijmegen, Netherlands
| | - Peter Friedl
- David H. Koch Center for Applied Research of Genitourinary Cancers, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA and in the Department of Cell Biology, Radboud University Medical Centre, 6525GA Nijmegen, Netherlands
- Cancer Genomics Center, 3584 CG Utrecht, Netherlands
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18
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Jasti AK, Selmi C, Sarmiento-Monroy JC, Vega DA, Anaya JM, Gershwin ME. Guillain-Barré syndrome: causes, immunopathogenic mechanisms and treatment. Expert Rev Clin Immunol 2016; 12:1175-1189. [PMID: 27292311 DOI: 10.1080/1744666x.2016.1193006] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Guillain-Barré syndrome is a rare disease representing the most frequent cause of acute flaccid symmetrical weakness of the limbs and areflexia usually reaching its peak within a month. The etiology and pathogenesis remain largely enigmatic and the syndrome results in death or severe disability in 9-17% of cases despite immunotherapy. Areas covered: In terms of etiology, Guillain-Barré syndrome is linked to Campylobacter infection but less than 0.1% of infections result in the syndrome. In terms of pathogenesis, activated macrophages and T cells and serum antibodies against gangliosides are observed but their significance is unclear. Expert commentary: Guillain-Barré syndrome is a heterogeneous condition with numerous subtypes and recent data point towards the role of ganglioside epitopes by immunohistochemical methods. Ultimately, the syndrome results from a permissive genetic background on which environmental factors, including infections, vaccination and the influence of aging, lead to disease.
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Affiliation(s)
- Anil K Jasti
- a Division of Rheumatology, Allergy, and Clinical Immunology , University of California Davis , Davis , CA , USA
| | - Carlo Selmi
- b Rheumatology and Clinical Immunology , Humanitas Research Hospital , Rozzano , Milan , Italy.,c BIOMETRA Department , University of Milan , Milan , Italy
| | - Juan C Sarmiento-Monroy
- d Center for Autoimmune Diseases Research (CREA) , Universidad del Rosario , Bogota , Colombia
| | - Daniel A Vega
- e Intensive Care Unit, Mederi, Hospital Universitario Mayor , Universidad del Rosario , Bogotá , Colombia
| | - Juan-Manuel Anaya
- d Center for Autoimmune Diseases Research (CREA) , Universidad del Rosario , Bogota , Colombia
| | - M Eric Gershwin
- a Division of Rheumatology, Allergy, and Clinical Immunology , University of California Davis , Davis , CA , USA
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19
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Wang J, Yang G, Dubrovsky AM, Choi J, Leung PSC. Xenobiotics and loss of tolerance in primary biliary cholangitis. World J Gastroenterol 2016; 22:338-348. [PMID: 26755880 PMCID: PMC4698496 DOI: 10.3748/wjg.v22.i1.338] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 08/15/2015] [Accepted: 12/01/2015] [Indexed: 02/06/2023] Open
Abstract
Data from genome wide association studies and geoepidemiological studies established that a combination of genetic predisposition and environmental stimulation is required for the loss of tolerance in primary biliary cholangitis (PBC). The serologic hallmark of PBC are the presence of high titer anti-mitochondrial autoantibodies (AMA) that recognize the lipoyl domain of the mitochondrial pyruvate dehydrogenase E2 (PDC-E2) subunit. Extensive efforts have been directed to investigate the molecular basis of AMA. Recently, experimental data has pointed to the thesis that the breaking of tolerance to PDC-E2 is a pivotal event in the initial etiology of PBC, including environmental xenobiotics including those commonly found in cosmetics and food additives, suggesting that chemical modification of the PDC-E2 epitope may render its vulnerable to become a neo-antigen and trigger an immune response in genetically susceptible hosts. Here, we will discuss the natural history, genetics and immunobiology of PBC and structural constraints of PDC-E2 in AMA recognition which makes it vulnerable to chemical modification.
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20
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Beuers U, Gershwin ME. Unmet challenges in immune-mediated hepatobiliary diseases. Clin Rev Allergy Immunol 2016; 48:127-31. [PMID: 25820618 DOI: 10.1007/s12016-015-8484-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
It is ironic that the liver, which serves a critical function in immune tolerance, itself becomes the victim of an autoimmune attack. Indeed, liver autoimmunity and the autoimmune diseases associated with both innate and adaptive responses to hepatocytes and/or cholangiocytes are models of human autoimmunity. For example, in primary biliary cirrhosis, there exists a well-defined and characteristic autoantibody and considerable homogeneity between patients. In autoimmune hepatitis, there are clinical characteristics that allow a rigorous subset definition and well-defined inflammatory infiltrates. In both cases, there are defects in a variety of immune pathways and including regulatory cells. In primary sclerosing cholangitis, with its characteristic overlap with inflammatory bowel disease, there are unique defects in innate immunity and particular important contribution of lymphoid homing to disease pathogenesis. In these diseases, as with other human autoimmune processes, there is the critical understanding that pathogenesis requires a genetic background, but is determined by environmental features, and indeed the concordance of these diseases in identical twins highlights the stochastic nature of immunopathology. Unfortunately, despite major advances in basic immunology and in immunopathology in these diseases, there remains a major void in therapy. The newer biologics that are so widely used in rheumatology, neurology, and gastroenterology have not yet seen success in autoimmune liver disease. Future efforts will depend on more rigorous molecular biology and systems analysis in order for successful application to be made to patients.
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Affiliation(s)
- Ulrich Beuers
- Department of Gastroenterology and Hepatology, Tytgat Institute for Liver and Intestinal Research, Academic Medical Center, University of Amsterdam, P.O. Box 22600, 1100 DD, Amsterdam, The Netherlands,
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21
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Yesilkoy F, Ueno R, Desbiolles BXE, Grisi M, Sakai Y, Kim BJ, Brugger J. Highly efficient and gentle trapping of single cells in large microfluidic arrays for time-lapse experiments. BIOMICROFLUIDICS 2016; 10:014120. [PMID: 26909126 PMCID: PMC4760974 DOI: 10.1063/1.4942457] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 02/09/2016] [Indexed: 05/24/2023]
Abstract
The isolation of single biological cells and their further cultivation in dedicated arrayed chambers are key to the collection of statistically reliable temporal data in cell-based biological experiments. In this work, we present a hydrodynamic single cell trapping and culturing platform that facilitates cell observation and experimentation using standard bio-lab equipment. The proposed design leverages the stochastic position of the cells as they flow into the structured microfluidic channels, where hundreds of single cells are then arrayed in nanoliter chambers for simultaneous cell specific data collection. Numerical simulation tools are used to devise and implement a hydrodynamic cell trapping mechanism that is minimally detrimental to the cell cycle and retains high overall trapping efficiency (∼70%) with the capability of reaching high fill factors (>90%) in short loading times (1-4 min) in a 400-trap device. A Monte Carlo model is developed using the design parameters to estimate the system trapping efficiencies, which show strong agreement with the experimentally acquired data. As proof of concept, arrayed mammalian tissue cells (MIA PaCa-2) are cultured in the microfluidic chambers for two days without viability problems.
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Affiliation(s)
| | - R Ueno
- Institute of Industrial Science, The University of Tokyo , Meguro-ku, Tokyo 153-8505, Japan
| | - B X E Desbiolles
- Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne , 1015 Lausanne, Switzerland
| | - M Grisi
- Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne , 1015 Lausanne, Switzerland
| | - Y Sakai
- Institute of Industrial Science, The University of Tokyo , Meguro-ku, Tokyo 153-8505, Japan
| | - B J Kim
- Institute of Industrial Science, The University of Tokyo , Meguro-ku, Tokyo 153-8505, Japan
| | - J Brugger
- Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne , 1015 Lausanne, Switzerland
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22
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Clonal expansion under the microscope: studying lymphocyte activation and differentiation using live‐cell imaging. Immunol Cell Biol 2015; 94:242-9. [DOI: 10.1038/icb.2015.104] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 11/12/2015] [Accepted: 11/16/2015] [Indexed: 12/24/2022]
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23
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Murphy JN, Harris KD, Buriak JM. Automated Defect and Correlation Length Analysis of Block Copolymer Thin Film Nanopatterns. PLoS One 2015; 10:e0133088. [PMID: 26207990 PMCID: PMC4514826 DOI: 10.1371/journal.pone.0133088] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 06/22/2015] [Indexed: 11/22/2022] Open
Abstract
Line patterns produced by lamellae- and cylinder-forming block copolymer (BCP) thin films are of widespread interest for their potential to enable nanoscale patterning over large areas. In order for such patterning methods to effectively integrate with current technologies, the resulting patterns need to have low defect densities, and be produced in a short timescale. To understand whether a given polymer or annealing method might potentially meet such challenges, it is necessary to examine the evolution of defects. Unfortunately, few tools are readily available to researchers, particularly those engaged in the synthesis and design of new polymeric systems with the potential for patterning, to measure defects in such line patterns. To this end, we present an image analysis tool, which we have developed and made available, to measure the characteristics of such patterns in an automated fashion. Additionally we apply the tool to six cylinder-forming polystyrene-block-poly(2-vinylpyridine) polymers thermally annealed to explore the relationship between the size of each polymer and measured characteristics including line period, line-width, defect density, line-edge roughness (LER), line-width roughness (LWR), and correlation length. Finally, we explore the line-edge roughness, line-width roughness, defect density, and correlation length as a function of the image area sampled to determine each in a more rigorous fashion.
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Affiliation(s)
- Jeffrey N. Murphy
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
- National Institute for Nanotechnology (NINT), Edmonton, Alberta, Canada
| | - Kenneth D. Harris
- National Institute for Nanotechnology (NINT), Edmonton, Alberta, Canada
| | - Jillian M. Buriak
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
- National Institute for Nanotechnology (NINT), Edmonton, Alberta, Canada
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24
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Thurley K, Gerecht D, Friedmann E, Höfer T. Three-Dimensional Gradients of Cytokine Signaling between T Cells. PLoS Comput Biol 2015; 11:e1004206. [PMID: 25923703 PMCID: PMC4414419 DOI: 10.1371/journal.pcbi.1004206] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 02/17/2015] [Indexed: 11/20/2022] Open
Abstract
Immune responses are regulated by diffusible mediators, the cytokines, which act at sub-nanomolar concentrations. The spatial range of cytokine communication is a crucial, yet poorly understood, functional property. Both containment of cytokine action in narrow junctions between immune cells (immunological synapses) and global signaling throughout entire lymph nodes have been proposed, but the conditions under which they might occur are not clear. Here we analyze spatially three-dimensional reaction-diffusion models for the dynamics of cytokine signaling at two successive scales: in immunological synapses and in dense multicellular environments. For realistic parameter values, we observe local spatial gradients, with the cytokine concentration around secreting cells decaying sharply across only a few cell diameters. Focusing on the well-characterized T-cell cytokine interleukin-2, we show how cytokine secretion and competitive uptake determine this signaling range. Uptake is shaped locally by the geometry of the immunological synapse. However, even for narrow synapses, which favor intrasynaptic cytokine consumption, escape fluxes into the extrasynaptic space are expected to be substantial (≥20% of secretion). Hence paracrine signaling will generally extend beyond the synapse but can be limited to cellular microenvironments through uptake by target cells or strong competitors, such as regulatory T cells. By contrast, long-range cytokine signaling requires a high density of cytokine producers or weak consumption (e.g., by sparsely distributed target cells). Thus in a physiological setting, cytokine gradients between cells, and not bulk-phase concentrations, are crucial for cell-to-cell communication, emphasizing the need for spatially resolved data on cytokine signaling. The adaptive immune system fights pathogens through the activation of immune cell clones that specifically recognize a particular pathogen. Tight contacts, so-called immunological synapses, of immune cells with cells that present ‘digested’ pathogen molecules are pivotal for ensuring specificity. The discovery that immune responses are regulated by small diffusible proteins – the cytokines – has been surprising because cytokine diffusion to ‘bystander’ cells might compromise specificity. It has therefore been argued that cytokines are trapped in immunological synapses, whereas other authors have found that cytokines act on a larger scale through entire lymph nodes. Measurements of cytokine concentrations with fine spatial resolution have not been achieved. Here, we study the spatio-temporal dynamics of cytokines through mathematical analysis and three-dimensional numerical simulation and identify key parameters that control signaling range. We predict that even tight immunological synapses leak a substantial portion of the secreted cytokines. Nevertheless, rapid cellular uptake will render cytokine signals short-range and thus incidental activation of bystander cells can be limited. Long-range signals will only occur with multiple secreting cells or/and slow consumption by sparse target cells. Thus our study identifies key determinants of the spatial range of cytokine communication in realistic multicellular geometries.
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Affiliation(s)
- Kevin Thurley
- Division of Theoretical Systems Biology, German Cancer Research Center, Heidelberg, Germany
- Institute for Theoretical Biology, Charité-Universitätsmedizin, Berlin, Germany
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California, United States of America
- * E-mail: (KT); (DG); (EF); (TH)
| | - Daniel Gerecht
- Institute for Applied Mathematics, University of Heidelberg, Heidelberg, Germany
- * E-mail: (KT); (DG); (EF); (TH)
| | - Elfriede Friedmann
- Institute for Applied Mathematics, University of Heidelberg, Heidelberg, Germany
- * E-mail: (KT); (DG); (EF); (TH)
| | - Thomas Höfer
- Division of Theoretical Systems Biology, German Cancer Research Center, Heidelberg, Germany
- Bioquant Center, University of Heidelberg, Heidelberg, Germany
- * E-mail: (KT); (DG); (EF); (TH)
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