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Hisey CL, Hearn JI, Hansford DJ, Blenkiron C, Chamley LW. Micropatterned growth surface topography affects extracellular vesicle production. Colloids Surf B Biointerfaces 2021; 203:111772. [PMID: 33894649 DOI: 10.1016/j.colsurfb.2021.111772] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 04/13/2021] [Accepted: 04/14/2021] [Indexed: 12/18/2022]
Abstract
Extracellular vesicles (EVs) are micro and nanoscale packages that circulate in all bodily fluids and play an important role in intercellular communication by shuttling biomolecules to nearby and distant cells. However, producing sufficient amounts of EVs for many types of in vitro studies using standard culture methods can be challenging, and despite the success of some bioreactors in increasing EV-production, it is still largely unknown how individual culture conditions can alter the production and content of EVs. In this study, we demonstrate a simple and inexpensive micropatterning technique that can be used to produce polystyrene microtracks over a 100 mm diameter growth surface area. We then demonstrate that these microtracks can play a significant role in increasing EV production using a triple-negative breast cancer cell line (MDA-MB-231) and that these changes in EV production correlate with increases in cellular aspect ratio, alignment of the cells' long axes to the microtracks, and single-cell migration rates. These findings have implications in both biomanufacturing of EVs and potentially in enhancing the biomimicry of EVs produced in vitro.
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Affiliation(s)
- Colin L Hisey
- Obstetrics and Gynaecology, University of Auckland, FMHS Building 502-201, 85 Park Rd, Grafton, Auckland, 1023, New Zealand; Hub for Extracellular Vesicle Investigations, University of Auckland, FMHS Building 502-201, 85 Park Rd, Grafton, Auckland, 1023, New Zealand.
| | - James I Hearn
- Molecular Medicine and Pathology, University of Auckland, FMHS Building 502-301, 85 Park Rd, Grafton, Auckland, 1023, New Zealand.
| | - Derek J Hansford
- Biomedical Engineering, The Ohio State University, 293 Bevis Hall, 1080 Carmack Road, Columbus, OH, 43210, USA.
| | - Cherie Blenkiron
- Hub for Extracellular Vesicle Investigations, University of Auckland, FMHS Building 502-201, 85 Park Rd, Grafton, Auckland, 1023, New Zealand; Molecular Medicine and Pathology, University of Auckland, FMHS Building 502-301, 85 Park Rd, Grafton, Auckland, 1023, New Zealand; Auckland Cancer Society Research Centre, University of Auckland, FMHS, 85 Park Road, Grafton, Auckland, 1023, New Zealand.
| | - Lawrence W Chamley
- Obstetrics and Gynaecology, University of Auckland, FMHS Building 502-201, 85 Park Rd, Grafton, Auckland, 1023, New Zealand; Hub for Extracellular Vesicle Investigations, University of Auckland, FMHS Building 502-201, 85 Park Rd, Grafton, Auckland, 1023, New Zealand.
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2
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Hisey CL, Mitxelena-Iribarren O, Martínez-Calderón M, Gordon JB, Olaizola SM, Benavente-Babace A, Mujika M, Arana S, Hansford DJ. A versatile cancer cell trapping and 1D migration assay in a microfluidic device. Biomicrofluidics 2019; 13:044105. [PMID: 31372193 PMCID: PMC6656575 DOI: 10.1063/1.5103269] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 07/05/2019] [Indexed: 05/12/2023]
Abstract
Highly migratory cancer cells often lead to metastasis and recurrence and are responsible for the high mortality rates in many cancers despite aggressive treatment. Recently, the migratory behavior of patient-derived glioblastoma multiforme cells on microtracks has shown potential in predicting the likelihood of recurrence, while at the same time, antimetastasis drugs have been developed which require simple yet relevant high-throughput screening systems. However, robust in vitro platforms which can reliably seed single cells and measure their migration while mimicking the physiological tumor microenvironment have not been demonstrated. In this study, we demonstrate a microfluidic device which hydrodynamically seeds single cancer cells onto stamped or femtosecond laser ablated polystyrene microtracks, promoting 1D migratory behavior due to the cells' tendency to follow topographical cues. Using time-lapse microscopy, we found that single U87 glioblastoma multiforme cells migrated more slowly on laser ablated microtracks compared to stamped microtracks of equal width and spacing (p < 0.05) and exhibited greater directional persistence on both 1D patterns compared to flat polystyrene (p < 0.05). Single-cell morphologies also differed significantly between flat and 1D patterns, with cells on 1D substrates exhibiting higher aspect ratios and less circularity (p < 0.05). This microfluidic platform could lead to automated quantification of single-cell migratory behavior due to the high predictability of hydrodynamic seeding and guided 1D migration, an important step to realizing the potential of microfluidic migration assays for drug screening and individualized medicine.
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Affiliation(s)
- Colin L. Hisey
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | | | | | - Jaymeson B. Gordon
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | | | | | | | | | - Derek J. Hansford
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
- Author to whom correspondence should be addressed:
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3
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Dorayappan KDP, Gardner ML, Hisey CL, Zingarelli RA, Smith BQ, Lightfoot MDS, Gogna R, Flannery MM, Hays J, Hansford DJ, Freitas MA, Yu L, Cohn DE, Selvendiran K. A Microfluidic Chip Enables Isolation of Exosomes and Establishment of Their Protein Profiles and Associated Signaling Pathways in Ovarian Cancer. Cancer Res 2019; 79:3503-3513. [PMID: 31097475 DOI: 10.1158/0008-5472.can-18-3538] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 02/15/2019] [Accepted: 05/09/2019] [Indexed: 01/15/2023]
Abstract
Because of limits on specificity and purity to allow for in-depth protein profiling, a standardized method for exosome isolation has yet to be established. In this study, we describe a novel, in-house microfluidic-based device to isolate exosomes from culture media and patient samples. This technology overcomes contamination issues because sample separation is based on the expression of highly specific surface markers CD63 and EpCAM. Mass spectrometry revealed over 25 exosome proteins that are differentially expressed in high-grade serous ovarian cancer (HGSOC) cell lines compared with normal cells-ovarian surface epithelia cells and fallopian tube secretory epithelial cells (FTSEC). Top exosome proteins were identified on the basis of their fold change and statistical significance between groups. Ingenuity pathway analysis identified STAT3 and HGF as top regulator proteins. We further validated exosome proteins of interest (pSTAT3, HGF, and IL6) in HGSOC samples of origin-based cell lines (OVCAR-8, FTSEC) and in early-stage HGSOC patient serum exosome samples using LC/MS-MS and proximity extension assay. Our microfluidic device will allow us to make new discoveries for exosome-based biomarkers for the early detection of HGSOC and will contribute to the development of new targeted therapies based on signaling pathways that are unique to HGSOC, both of which could improve the outcome for women with HGSOC. SIGNIFICANCE: A unique platform utilizing a microfluidic device enables the discovery of new exosome-based biomarkers in ovarian cancer.
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Affiliation(s)
- Kalpana Deepa Priya Dorayappan
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Miranda L Gardner
- Department of Cancer Biology and Genetics, Comprehensive Cancer Center, The Ohio State University, Wexner Medical Center, Columbus, Ohio
| | - Colin L Hisey
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Roman A Zingarelli
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Brentley Q Smith
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Michelle D S Lightfoot
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Rajan Gogna
- Champalimaud Center for the Unknown, Lisbon, Portugal
| | - Meghan M Flannery
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - John Hays
- Division of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Derek J Hansford
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Michael A Freitas
- Department of Cancer Biology and Genetics, Comprehensive Cancer Center, The Ohio State University, Wexner Medical Center, Columbus, Ohio
| | - Lianbo Yu
- Department of Biostatistics, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - David E Cohn
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Karuppaiyah Selvendiran
- Division of Gynecologic Oncology, Department of Obstetrics/Gynecology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, Ohio.
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4
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Hisey CL, Dorayappan KDP, Cohn DE, Selvendiran K, Hansford DJ. Microfluidic affinity separation chip for selective capture and release of label-free ovarian cancer exosomes. Lab Chip 2018; 18:3144-3153. [PMID: 30191215 DOI: 10.1039/c8lc00834e] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Exosomes are nanoscale vesicles found in many bodily fluids which play a significant role in cell-to-cell signaling and contain biomolecules indicative of their cells of origin. Recently, microfluidic devices have provided the ability to efficiently capture exosomes based on specific membrane biomarkers, but releasing the captured exosomes intact and label-free for downstream characterization and experimentation remains a challenge. We present a herringbone-grooved microfluidic device which is covalently functionalized with antibodies against general and cancer exosome membrane biomarkers (CD9 and EpCAM) to isolate exosomes from small volumes of high-grade serous ovarian cancer (HGSOC) serum. Following capture, intact exosomes are released label-free using a low pH buffer and immediately neutralized downstream to ensure their stability. Characterization of captured and released exosomes was performed using fluorescence microscopy, nanoparticle tracking analysis, flow-cytometry, and SEM. Our results demonstrate the successful isolation of intact and label-free exosomes, indicate that the amount of both total and EpCAM+ exosomes increases with HGSOC disease progression, and demonstrate the downstream internalization of isolated exosomes by OVCAR8 cells. This device and approach can be utilized for a nearly limitless range of downstream exosome analytical and experimental techniques, both on and off-chip.
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Affiliation(s)
- Colin L Hisey
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.
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5
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Higuita-Castro N, Nelson MT, Shukla V, Agudelo-Garcia PA, Zhang W, Duarte-Sanmiguel SM, Englert JA, Lannutti JJ, Hansford DJ, Ghadiali SN. Using a Novel Microfabricated Model of the Alveolar-Capillary Barrier to Investigate the Effect of Matrix Structure on Atelectrauma. Sci Rep 2017; 7:11623. [PMID: 28912466 PMCID: PMC5599538 DOI: 10.1038/s41598-017-12044-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 09/01/2017] [Indexed: 11/25/2022] Open
Abstract
The alveolar-capillary barrier is composed of epithelial and endothelial cells interacting across a fibrous extracelluar matrix (ECM). Although remodeling of the ECM occurs during several lung disorders, it is not known how fiber structure and mechanics influences cell injury during cyclic airway reopening as occurs during mechanical ventilation (atelectrauma). We have developed a novel in vitro platform that mimics the micro/nano-scale architecture of the alveolar microenvironment and have used this system to investigate how ECM microstructural properties influence epithelial cell injury during airway reopening. In addition to epithelial-endothelial interactions, our platform accounts for the fibrous topography of the basal membrane and allows for easy modulation of fiber size/diameter, density and stiffness. Results indicate that fiber stiffness and topography significantly influence epithelial/endothelial barrier function where increased fiber stiffness/density resulted in altered cytoskeletal structure, increased tight junction (TJ) formation and reduced barrier permeability. However, cells on rigid/dense fibers were also more susceptible to injury during airway reopening. These results indicate that changes in the mechanics and architecture of the lung microenvironment can significantly alter cell function and injury and demonstrate the importance of implementing in vitro models that more closely resemble the natural conditions of the lung microenvironment.
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Affiliation(s)
- N Higuita-Castro
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio, United States.,Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - M T Nelson
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio, United States
| | - V Shukla
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio, United States.,Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - P A Agudelo-Garcia
- Department of Molecular and Cellular Biochemistry, The Ohio State University, Columbus, Ohio, United States
| | - W Zhang
- Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - S M Duarte-Sanmiguel
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio, United States.,Human Nutrition Program, The Ohio State University, Columbus, Ohio, United States
| | - J A Englert
- Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
| | - J J Lannutti
- Department of Material Sciences and Engineering, The Ohio State University, Columbus, Ohio, United States
| | - D J Hansford
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio, United States
| | - S N Ghadiali
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio, United States. .,Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States. .,Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States.
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6
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Gallego-Perez D, Chang L, Shi J, Ma J, Kim SH, Zhao X, Malkoc V, Wang X, Minata M, Kwak KJ, Wu Y, Lafyatis GP, Lu W, Hansford DJ, Nakano I, Lee LJ. On-Chip Clonal Analysis of Glioma-Stem-Cell Motility and Therapy Resistance. Nano Lett 2016; 16:5326-32. [PMID: 27420544 PMCID: PMC5040341 DOI: 10.1021/acs.nanolett.6b00902] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Enhanced glioma-stem-cell (GSC) motility and therapy resistance are considered to play key roles in tumor cell dissemination and recurrence. As such, a better understanding of the mechanisms by which these cells disseminate and withstand therapy could lead to more efficacious treatments. Here, we introduce a novel micro-/nanotechnology-enabled chip platform for performing live-cell interrogation of patient-derived GSCs with single-clone resolution. On-chip analysis revealed marked intertumoral differences (>10-fold) in single-clone motility profiles between two populations of GSCs, which correlated well with results from tumor-xenograft experiments and gene-expression analyses. Further chip-based examination of the more-aggressive GSC population revealed pronounced interclonal variations in motility capabilities (up to ∼4-fold) as well as gene-expression profiles at the single-cell level. Chip-supported therapy resistance studies with a chemotherapeutic agent (i.e., temozolomide) and an oligo RNA (anti-miR363) revealed a subpopulation of CD44-high GSCs with strong antiapoptotic behavior as well as enhanced motility capabilities. The living-cell-interrogation chip platform described herein enables thorough and large-scale live monitoring of heterogeneous cancer-cell populations with single-cell resolution, which is not achievable by any other existing technology and thus has the potential to provide new insights into the cellular and molecular mechanisms modulating glioma-stem-cell dissemination and therapy resistance.
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Affiliation(s)
- Daniel Gallego-Perez
- Department of Surgery, The Ohio State University, 395 West 12th Avenue, Columbus, Ohio 43210
- Department of Biomedical Engineering, The Ohio State University, 1080 Carmack Road, Columbus, Ohio 43210
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Center for Regenerative Medicine and Cell-Based Therapies, The Ohio State University, 460 West 12th Avenue, Columbus, Ohio 43210, United States
- Corresponding Authors:.;
| | - Lingqian Chang
- Department of Biomedical Engineering, The Ohio State University, 1080 Carmack Road, Columbus, Ohio 43210
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
| | - Junfeng Shi
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Department of Mechanical Engineering, The Ohio State University, 201 West 19th Avenue, Columbus, Ohio 43210
| | - Junyu Ma
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
| | - Sung-Hak Kim
- Department of Neurosurgery, University of Alabama, 1824 6th Avenuce South, Birmingham, Alabama 35294
| | - Xi Zhao
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210
| | - Veysi Malkoc
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210
| | - Xinmei Wang
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210
| | - Mutsuko Minata
- Department of Neurosurgery, University of Alabama, 1824 6th Avenuce South, Birmingham, Alabama 35294
| | - Kwang J. Kwak
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210
| | - Yun Wu
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
| | - Gregory P. Lafyatis
- Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210
| | - Wu Lu
- Department of Electrical and Computer Engineering, The Ohio State University, 2015 Neil Avenue, Columbus, Ohio 43210
| | - Derek J. Hansford
- Department of Biomedical Engineering, The Ohio State University, 1080 Carmack Road, Columbus, Ohio 43210
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
| | - Ichiro Nakano
- Department of Neurosurgery, University of Alabama, 1824 6th Avenuce South, Birmingham, Alabama 35294
| | - L. James Lee
- Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, 151 W. Woodruff Avenue, Columbus, Ohio 43210
- Center for Regenerative Medicine and Cell-Based Therapies, The Ohio State University, 460 West 12th Avenue, Columbus, Ohio 43210, United States
- Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210
- Corresponding Authors:.;
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7
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Carvalho A, Pelaez-Vargas A, Hansford DJ, Fernandes MH, Monteiro FJ. Effects of Line and Pillar Array Microengineered SiO2 Thin Films on the Osteogenic Differentiation of Human Bone Marrow-Derived Mesenchymal Stem Cells. Langmuir 2016; 32:1091-100. [PMID: 26771563 DOI: 10.1021/acs.langmuir.5b03955] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A primary goal in bone tissue engineering is the design of implants that induce controlled, guided, and rapid healing. The events that normally lead to the integration of an implant into bone and determine the performance of the device occur mainly at the tissue-implant interface. Topographical surface modification of a biomaterial might be an efficient tool for inducing stem cell osteogenic differentiation and replace the use of biochemical stimuli. The main goal of this work was to develop micropatterned bioactive silica thin films to induce the osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (hMSCs) only through topographical stimuli. Line and pillar micropatterns were developed by a combination of sol-gel/soft lithography and characterized by scanning electron microscopy, atomic force microscopy, and contact angle measurements. hMSCs were cultured onto the microfabricated thin films and flat control for up to 21 days under basal conditions. The micropatterned groups induced levels of osteogenic differentiation and expression of osteoblast-associated markers higher than those of the flat controls. Via comparison of the micropatterns, the pillars caused a stronger response of the osteogenic differentiation of hMSCs with a higher level of expression of osteoblast-associated markers, ALP activity, and extracellular matrix mineralization after the cells had been cultured for 21 days. These findings suggest that specific microtopographic cues can direct hMSCs toward osteogenic differentiation.
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Affiliation(s)
- Angela Carvalho
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- INEB-Instituto de Engenharia Biomédica, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e Materiais, Universidade do Porto , Rua Dr Roberto Frias, s/n, 4200-465 Porto, Portugal
| | - Alejandro Pelaez-Vargas
- Universidad Cooperativa de Colombia , Faculty of Dentistry, Carrera 47 # 37sur-18, Medellín, Colombia
| | - Derek J Hansford
- Department of Biomedical Engineering, The Ohio State University , 1080 Carmack Road, Columbus, Ohio 43210, United States
| | - Maria H Fernandes
- Laboratory for Bone Metabolism and Regeneration, Faculdade de Medicina Dentária, Universidade do Porto , Rua Dr. Manuel Pereira da Silva, 4200-393 Porto, Portugal
| | - Fernando J Monteiro
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- INEB-Instituto de Engenharia Biomédica, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e Materiais, Universidade do Porto , Rua Dr Roberto Frias, s/n, 4200-465 Porto, Portugal
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8
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Higuita-Castro N, Mihai C, Hansford DJ, Ghadiali SN. Influence of airway wall compliance on epithelial cell injury and adhesion during interfacial flows. J Appl Physiol (1985) 2014; 117:1231-42. [PMID: 25213636 DOI: 10.1152/japplphysiol.00752.2013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Interfacial flows during cyclic airway reopening are an important source of ventilator-induced lung injury. However, it is not known how changes in airway wall compliance influence cell injury during airway reopening. We used an in vitro model of airway reopening in a compliant microchannel to investigate how airway wall stiffness influences epithelial cell injury. Epithelial cells were grown on gel substrates with different rigidities, and cellular responses to substrate stiffness were evaluated in terms of metabolic activity, mechanics, morphology, and adhesion. Repeated microbubble propagations were used to simulate cyclic airway reopening, and cell injury and detachment were quantified via live/dead staining. Although cells cultured on softer gels exhibited a reduced elastic modulus, these cells experienced less plasma membrane rupture/necrosis. Cells on rigid gels exhibited a minor, but statistically significant, increase in the power law exponent and also exhibited a significantly larger height-to-length aspect ratio. Previous studies indicate that this change in morphology amplifies interfacial stresses and, therefore, correlates with the increased necrosis observed during airway reopening. Although cells cultured on stiff substrates exhibited more plasma membrane rupture, these cells experienced significantly less detachment and monolayer disruption during airway reopening. Western blotting and immunofluorescence indicate that this protection from detachment and monolayer disruption correlates with increased focal adhesion kinase and phosphorylated paxillin expression. Therefore, changes in cell morphology and focal adhesion structure may govern injury responses during compliant airway reopening. In addition, these results indicate that changes in airway compliance, as occurs during fibrosis or emphysema, may significantly influence cell injury during mechanical ventilation.
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Affiliation(s)
| | - Cosmin Mihai
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio
| | - Derek J Hansford
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio
| | - Samir N Ghadiali
- Biomedical Engineering Department, The Ohio State University, Columbus, Ohio; Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio; and Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio
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9
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Min Y, Yang Y, Poojari Y, Liu Y, Wu JC, Hansford DJ, Epstein AJ. Sulfonated Polyaniline-Based Organic Electrodes for Controlled Electrical Stimulation of Human Osteosarcoma Cells. Biomacromolecules 2013; 14:1727-31. [DOI: 10.1021/bm301221t] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Yong Min
- Institute of Advanced
Materials, Nanjing University of Posts and Telecommunications, Nanjing 210046, People’s
Republic of China
| | | | | | - Yidong Liu
- Institute of Advanced
Materials, Nanjing University of Posts and Telecommunications, Nanjing 210046, People’s
Republic of China
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10
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Pelaez-Vargas A, Gallego-Perez D, Carvalho A, Fernandes MH, Hansford DJ, Monteiro FJ. Effects of density of anisotropic microstamped silica thin films on guided bone tissue regeneration-In vitrostudy. J Biomed Mater Res B Appl Biomater 2013; 101:762-9. [DOI: 10.1002/jbm.b.32879] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2012] [Revised: 10/23/2012] [Accepted: 11/25/2012] [Indexed: 11/09/2022]
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11
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Gallego-Perez D, Higuita-Castro N, Reen RK, Palacio-Ochoa M, Sharma S, Lee LJ, Lannutti JJ, Hansford DJ, Gooch KJ. Micro/nanoscale technologies for the development of hormone-expressing islet-like cell clusters. Biomed Microdevices 2012; 14:779-89. [PMID: 22573223 DOI: 10.1007/s10544-012-9657-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Insulin-expressing islet-like cell clusters derived from precursor cells have significant potential in the treatment of type-I diabetes. Given that cluster size and uniformity are known to influence islet cell behavior, the ability to effectively control these parameters could find applications in the development of anti-diabetic therapies. In this work, we combined micro and nanofabrication techniques to build a biodegradable platform capable of supporting the formation of islet-like structures from pancreatic precursors. Soft lithography and electrospinning were used to create arrays of microwells (150-500 μm diameter) structurally interfaced with a porous sheet of micro/nanoscale polyblend fibers (~0.5-10 μm in cross-sectional size), upon which human pancreatic ductal epithelial cells anchored and assembled into insulin-expressing 3D clusters. The microwells effectively regulated the spatial distribution of the cells on the platform, as well as cluster size, shape and homogeneity. Average cluster cross-sectional area (~14000-17500 μm(2)) varied in proportion to the microwell dimensions, and mean circularity values remained above 0.7 for all microwell sizes. In comparison, clustering on control surfaces (fibers without microwells or tissue culture plastic) resulted in irregularly shaped/sized cell aggregates. Immunoreactivity for insulin, C-peptide and glucagon was detected on both the platform and control surfaces; however, intracellular levels of C-peptide/cell were ~60 % higher on the platform.
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Affiliation(s)
- Daniel Gallego-Perez
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
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Higuita-Castro N, Gallego-Perez D, Love K, Sands MR, Kaletunç G, Hansford DJ. Soft Lithography-Based Fabrication of Biopolymer Microparticles for Nutrient Microencapsulation. Ind Biotechnol (New Rochelle N Y) 2012. [DOI: 10.1089/ind.2012.0030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Natalia Higuita-Castro
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Ohio Nanotech West Laboratory, The Ohio State University, Columbus, OH
| | - Daniel Gallego-Perez
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Ohio Nanotech West Laboratory, The Ohio State University, Columbus, OH
| | - Kelley Love
- Abbott Nutrition Products Division, Columbus, OH
| | - Matthew R. Sands
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Ohio Nanotech West Laboratory, The Ohio State University, Columbus, OH
| | - Gönül Kaletunç
- Department of Food, Agricultural and Biological Engineering, The Ohio State University, Columbus, OH
| | - Derek J. Hansford
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Ohio Nanotech West Laboratory, The Ohio State University, Columbus, OH
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Gallego-Perez D, Higuita-Castro N, Denning L, DeJesus J, Dahl K, Sarkar A, Hansford DJ. Microfabricated mimics of in vivo structural cues for the study of guided tumor cell migration. Lab Chip 2012; 12:4424-32. [PMID: 22936003 DOI: 10.1039/c2lc40726d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Guided cell migration plays a crucial role in tumor metastasis, which is considered to be the major cause of death in cancer patients. Such behavior is regulated in part by micro/nanoscale topographical cues present in the parenchyma or stroma in the form of fiber-like and/or conduit-like structures (e.g., white matter tracts, blood/lymphatic vessels, subpial and subperitoneal spaces). In this paper we used soft lithography micromolding to develop a tissue culture polystyrene platform with a microscale surface pattern that was able to induce guided cell motility along/through fiber-/conduit-like structures. The migratory behaviors of primary (glioma) and metastatic (lung and colon) tumors excised from the brain were monitored via time-lapse microscopy at the single cell level. All the tumor cells exhibited axially persistent cell migration, with percentages of unidirectionally motile cells of 84.0 ± 3.5%, 58.3 ± 6.8% and 69.4 ± 5.4% for the glioma, lung, and colon tumor cells, respectively. Lung tumor cells showed the highest migratory velocities (41.8 ± 4.6 μm h(-1)) compared to glioma (24.0 ± 1.8 μm h(-1)) and colon (26.7 ± 2.8 μm h(-1)) tumor cells. This platform could potentially be used in conjunction with other biological assays to probe the mechanisms underlying the metastatic phenotype under guided cell migration conditions, and possibly by itself as an indicator of the effectiveness of treatments that target specific tumor cell motility behaviors.
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Affiliation(s)
- Daniel Gallego-Perez
- Department of Biomedical Engineering, The Ohio State University, 270 Bevis Hall, 1080 Carmack Rd., Columbus, OH 43210, USA
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Higuita-Castro N, Gallego-Perez D, Pelaez-Vargas A, García Quiroz F, Posada OM, López LE, Sarassa CA, Agudelo-Florez P, Monteiro FJ, Litsky AS, Hansford DJ. Reinforced Portland cement porous scaffolds for load-bearing bone tissue engineering applications. J Biomed Mater Res B Appl Biomater 2011; 100:501-7. [PMID: 22121151 DOI: 10.1002/jbm.b.31976] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 08/09/2011] [Indexed: 11/06/2022]
Abstract
Modified Portland cement porous scaffolds with suitable characteristics for load-bearing bone tissue engineering applications were manufactured by combining the particulate leaching and foaming methods. Non-crosslinked polydimethylsiloxane was evaluated as a potential reinforcing material. The scaffolds presented average porosities between 70 and 80% with mean pore sizes ranging from 300 μm up to 5.0 mm. Non-reinforced scaffolds presented compressive strengths and elastic modulus values of 2.6 and 245 MPa, respectively, whereas reinforced scaffolds exhibited 4.2 and 443 MPa, respectively, an increase of ∼62 and 80%. Portland cement scaffolds supported human osteoblast-like cell adhesion, spreading, and propagation (t = 1-28 days). Cell metabolism and alkaline phosphatase activity were found to be enhanced at longer culture intervals (t ≥ 14 days). These results suggest the possibility of obtaining strong and biocompatible scaffolds for bone repair applications from inexpensive, yet technologically advanced materials such as Portland cement.
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Affiliation(s)
- Natalia Higuita-Castro
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210; Grupo de Investigación en Ingeniería Biomédica EIA-CES (GIBEC), Sabaneta, Colombia
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Gallego-Perez D, Higuita-Castro N, Quiroz FG, Posada OM, López LE, Litsky AS, Hansford DJ. Portland cement for bone tissue engineering: Effects of processing and metakaolin blends. J Biomed Mater Res B Appl Biomater 2011; 98:308-15. [DOI: 10.1002/jbm.b.31853] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Accepted: 02/01/2011] [Indexed: 11/09/2022]
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16
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Yang Y, Min Y, Wu JC, Hansford DJ, Feinberg SE, Epstein AJ. Synthesis and Characterization of Cytocompatible Sulfonated Polyanilines. Macromol Rapid Commun 2011; 32:887-92. [DOI: 10.1002/marc.201100095] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 04/07/2011] [Indexed: 11/11/2022]
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17
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Pelaez-Vargas A, Gallego-Perez D, Magallanes-Perdomo M, Fernandes MH, Hansford DJ, De Aza AH, Pena P, Monteiro FJ. Isotropic micropatterned silica coatings on zirconia induce guided cell growth for dental implants. Dent Mater 2011; 27:581-9. [PMID: 21459429 DOI: 10.1016/j.dental.2011.02.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 02/14/2011] [Accepted: 02/24/2011] [Indexed: 10/18/2022]
Abstract
UNLABELLED Titanium implants are the gold standard in dentistry; however, problems such as gingival tarnishing and peri-implantitis have been reported. For zirconia to become a competitive alternative dental implant material, surface modification techniques that induce guided tissue growth must be developed. OBJECTIVES To develop alternative surface modification techniques to promote guided tissue regeneration on zirconia materials, for applications in dental implantology. METHODS A methodology that combined soft lithography and sol-gel chemistry was used to obtain isotropic micropatterned silica coatings on yttria-stabilized zirconia substrates. The materials were characterized via chemical, structural, surface morphology approaches. In vitro biological behavior was evaluated in terms of early adhesion and viability/metabolic activity of human osteoblast-like cells. Statistical analysis was conducted using one-way ANOVA/Tukey HSD post hoc test. RESULTS Isotropic micropatterned silica coatings on yttria-stabilized zirconia substrates were obtained using a combined approach based on sol-gel technology and soft lithography. Micropatterned silica surfaces exhibited a biocompatible behavior, and modulated cell responses (i.e. inducing early alignment of osteoblast-like cells). After 7d of culture, the cells fully covered the top surfaces of pillar microstructured silica films. SIGNIFICANCE The micropatterned silica films on zirconia showed a biocompatible response, and were capable of inducing guided osteoblastic cell adhesion, spreading and propagation. The results herein presented suggest that surface-modified ceramic implants via soft lithography and sol-gel chemistry could potentially be used to guide periodontal tissue regeneration, thus promoting tight tissue apposition, and avoiding gingival retraction and peri-implantitis.
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Affiliation(s)
- A Pelaez-Vargas
- Instituto de Engenharia Biomédica, Divisão de Biomateriais, Universidade do Porto, Rua do Campo Alegre 823, Porto, Portugal.
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18
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Higuita‐Castro N, Mihai C, Hansford DJ, Ghadiali SN. Influence of Airway Wall Compliance on Epithelial Cell Injury during Cyclic Airway Reopening. FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.1035.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Cosmin Mihai
- Biomedical EngineeringThe Ohio State UniversityColumbusOH
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Gallego D, Ferrell NJ, Hansford DJ. Fabrication of Piezoelectric Polyvinylidene Fluoride (PVDF) Microstructures by Soft Lithography for Tissue Engineering and Cell Biology Applications. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-1002-n04-05] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTA method for the fabrication of piezoelectric polyvinylidene fluoride (PVDF) microstructures is described. Embossed and individual features with highly defined geometries at the microscale were obtained using soft lithography-based techniques. Various structure geometries were obtained, including pillars (three different aspect ratios), parallel lines, and criss-crossed lines. SEM characterization revealed uniform patterns with dimensions ranging from 2 μm ñ 15 μm. Human osteosarcoma (HOS) cell cultures were used to evaluate the cytocompatibility of the microstructures. SEM and fluorescence microscopy showed adequate cell adhesion, proliferation, and strong interaction with tips and corners of the microdiscontinuities. Microfabricated piezoelectric PVDF structures could find applications in the fabrication of mechanically active tissue engineering scaffolds, and the development of dynamic sensors at the cellular and subcellular levels.
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Gallego-Perez D, Ferrell NJ, Higuita-Castro N, Hansford DJ. Versatile methods for the fabrication of polyvinylidene fluoride microstructures. Biomed Microdevices 2010. [PMID: 20700656 DOI: 10.1007/s10544‐010‐9455‐9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Polyvinylidene fluoride (PVDF) microstructures are of interest for a number of BioMEMS applications both for their piezoelectric and biocompatible properties. In this work, simple soft lithography-based techniques were developed to fabricate PVDF microstructures with diverse geometries, including microarrays of pillars, lines, and wells. Four different microstructure configurations were created: freestanding, stamped discontinuous, stamped continuous and imprinted patterns. Features with lateral dimensions down to 1 μm were consistently reproduced on 2.5 cm diameter areas. Atomic force microscopy (AFM) measurements of poled PVDF microstructures confirmed a marked inverse piezoelectric behavior. The techniques presented here have a number of advantages over previously demonstrated PVDF micropatterning approaches.
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Affiliation(s)
- Daniel Gallego-Perez
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
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21
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Ferrell N, Gallego-Perez D, Higuita-Castro N, Butler RT, Reen RK, Gooch KJ, Hansford DJ. Vacuum-assisted cell seeding in a microwell cell culture system. Anal Chem 2010; 82:2380-6. [PMID: 20180539 DOI: 10.1021/ac902596b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We present a simple method to actively pattern individual cells and groups of cells in a polymer-based microdevice using vacuum-assisted cell seeding. Soft lithography is used to mold polymer microwells with various geometries on top of commercially available porous membranes. Cell suspensions are placed in a vacuum filtration setup to pull culture medium through the microdevice, trapping the cells in the microwells. The process is evaluated by determining the number of cells per microwell for a given cell seeding density and microwell geometry. This method is tested with adherent and nonadherent cells (NIH 3T3 fibroblasts, PANC-1 pancreatic ductal epithelial-like cells, and THP-1 monocytic leukemia cells). These devices could find applications in high-throughput cell screening, cell transport studies, guided formation of cell clusters, and tissue engineering.
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Affiliation(s)
- Nicholas Ferrell
- Department of Biomedical Engineering, Ohio State University, Columbus, Ohio 43210, USA
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22
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Gallego-Perez D, Higuita-Castro N, Sharma S, Reen RK, Palmer AF, Gooch KJ, Lee LJ, Lannutti JJ, Hansford DJ. High throughput assembly of spatially controlled 3D cell clusters on a micro/nanoplatform. Lab Chip 2010; 10:775-82. [PMID: 20221567 DOI: 10.1039/b919475d] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Guided assembly of microscale tissue subunits (i.e. 3D cell clusters/aggregates) has found applications in cell therapy/tissue engineering, cell and developmental biology, and drug discovery. As cluster size and geometry are known to influence cellular responses, the ability to spatially control cluster formation in a high throughput manner could be advantageous for many biomedical applications. In this work, a micro- and nanofabricated platform was developed for this purpose, consisting of a soft-lithographically fabricated array of through-thickness microwells structurally bonded to a sheet of electrospun fibers. The microwells and fibers were manufactured from several polymers of biomedical interest. Human hepatocytes were used as model cells to demonstrate the ability of the platform to allow controlled cluster formation. In addition, the ability of the device to support studies on semi-controlled heterotypic interactions was demonstrated by co-culturing hepatocytes and fibroblasts. Preliminary experiments with other cells of interest (pancreatic cells, embryonic stem cells, and cardiomyocytes) were also conducted. Our platform possesses several advantages over previously developed microwell arrays: a more in vivo-like topographical stimulation of cells; better nutrient/waste exchange through the underlying nanofiber mat; and easy integration into standard two-chamber cell culture well systems.
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Affiliation(s)
- Daniel Gallego-Perez
- Department of Biomedical Engineering, The Ohio State University, 270 Bevis Hall, 1080 Carmack Rd., Columbus, OH 43210, USA
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23
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Spiwak AJB, Horbal A, Leatherbury R, Hansford DJ. Extracorporeal tubing in the roller pump raceway: physical changes and particulate generation. J Extra Corpor Technol 2008; 40:188-192. [PMID: 18853831 PMCID: PMC4680645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Plasticized polyvinyl chloride tubing is used as the blood conduit in the heart lung bypass circuit. The section in the roller pump undergoes rigorous compression. Fatigue leads to material changes in weight and length of the bulk material. Particles are released during normal pump operation. This study evaluates the time course of particle loss. Three segments of 1/2" ID tubing run in the raceway for 30-minute, 1-hour, or 2-hour. The fluid path of each segment includes an oxygenator; a castor oil blend was used for the prime. The 5 mL sample was acquired at 10 minute intervals. Raceway tubing segments were measured for a change in weight and length. The same procedure repeated with 1/4" ID and 3/8" ID tubing. All tubing increased at least 5 mm by the 2-hour trial. There were no remarkable changes in weight. Particles were measured for size and percent volume. Tubing with 1/2" ID performed most consistently for particle release during all trials. Particles were observed as small as 1 nm. Particles as large as 3 micron could be confirmed. For all tubing there was particle release by 30 minutes. Perfusionists must consider tubing inner diameter and wall thickness in choosing the pPVC for the raceway in order to minimize particulate emboli. This research suggests that 3/8" ID tubing produces spalls inconsistently compared to 2" ID tubing. Thinner wall thickness tubing also has the potential to limit spall formation.
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24
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Gallego D, Ferrell N, Sun Y, Hansford DJ. Multilayer micromolding of degradable polymer tissue engineering scaffolds. Materials Science and Engineering: C 2008. [DOI: 10.1016/j.msec.2007.04.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Guan J, Ferrell N, Yu B, Hansford DJ, Lee LJ. Simultaneous fabrication of hybrid arrays of nanowires and micro/nanoparticles by dewetting on micropillars. Soft Matter 2007; 3:1369-1371. [PMID: 32900114 DOI: 10.1039/b709910j] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Large and well-defined arrays of both nanowires and micro/nanoparticles or only micro/nanoparticles are fabricated from aqueous solutions through a one-step dewetting process on an array of polydimethylsiloxane (PDMS) micropillars.
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Affiliation(s)
- Jingjiao Guan
- The Center for Affordable Nanoengineering of Polymer Biomedical Devices, The Ohio State University, Columbus, OH 43210, USA
| | - Nicholas Ferrell
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Bo Yu
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA..
| | - Derek J Hansford
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - L James Lee
- The Center for Affordable Nanoengineering of Polymer Biomedical Devices, The Ohio State University, Columbus, OH 43210, USA. and Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA..
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26
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Guan J, He H, Lee LJ, Hansford DJ. Fabrication of particulate reservoir-containing, capsulelike, and self-folding polymer microstructures for drug delivery. Small 2007; 3:412-8. [PMID: 17285662 DOI: 10.1002/smll.200600240] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- Jingjiao Guan
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
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27
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Kitzmiller JP, Hansford DJ, Fortin LD, Obrietan KH, Bergdall VK, Beversdorf DQ. Micro-field evoked potentials recorded from the porcine sub-dural cortical surface utilizing a microelectrode array. J Neurosci Methods 2007; 162:155-61. [PMID: 17298849 PMCID: PMC2223486 DOI: 10.1016/j.jneumeth.2007.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 01/08/2007] [Accepted: 01/08/2007] [Indexed: 11/19/2022]
Abstract
A sub-dural surface microelectrode array designed to detect micro-field evoked potentials has been developed. The device is comprised of an array of 350-microm square gold contacts, with bidirectional spacing of 150 microm, contained within a polyimide Kapton material. Cytotoxicity testing suggests that the device is suitable for use with animal and human patients. Implementation of the device in animal studies revealed that reliable evoked potentials could be acquired. Further work will be needed to determine how these micro-field potentials, which demonstrate selectivity for one eye, relate to the distribution of the ocular dominance columns of the occipital cortex.
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Affiliation(s)
- Joseph P. Kitzmiller
- Departments of Biomedical Engineering and Neurology; College of Medicine and Public Health, The Ohio State University, 460 Means Hall, 1654 Upham Drive, Columbus, Ohio 43210
| | - Derek J. Hansford
- Departments of Biomedical and Materials Science Engineering, The Ohio State University; Microfabrication, Ohio MicroMD Laboratory, 273 Bevis Hall, 1080 Carmack Hall, Columbus OH 43210
| | - Linda D. Fortin
- Neurodiagnostic Services, Ohio State University Medical Center, The Ohio State University, 410 West 10 Ave, Columbus OH 43210
| | - Karl H. Obrietan
- Department of Neuroscience, The Ohio State University, 4120 Graves Hall, 333 West 10 Ave., Columbus OH 43210
| | - Valerie K. Bergdall
- Department of Veterinary Preventive Medicine; University Lab Animal Resources, The Ohio State University, 101 Wiseman Hall, 400 West 12 Ave., Columbus OH 43210
| | - David Q. Beversdorf
- Department of Neurology, The Ohio State University, Ohio State University Medical Center, 469 Means Hall, 1654 Upham Drive, Columbus OH 43210, Phone (614) 293-8531, Fax: (614) 293-6111, E-mail:
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28
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Guan J, Ferrell N, James Lee L, Hansford DJ. Fabrication of polymeric microparticles for drug delivery by soft lithography. Biomaterials 2006; 27:4034-41. [PMID: 16574217 DOI: 10.1016/j.biomaterials.2006.03.011] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2005] [Accepted: 03/09/2006] [Indexed: 11/22/2022]
Abstract
Soft lithographic techniques were used to fabricate polymeric microparticles for drug delivery applications. The microparticles were made of thermoplastics and thermosets from different types of precursors including reactive resin and polymer solutions in organic solvents or water. The microparticles produced using these methods were made of widely used polymers for drug delivery with highly uniform sizes, plate-like morphology, and well-defined lateral sizes and shapes, making them potentially useful for drug delivery applications and as platform for the construction of multi-functional drug delivery devices.
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Affiliation(s)
- Jingjiao Guan
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
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29
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Abstract
This letter describes the fabrication of three-dimensional particulate-like hydrogel microstructures using a combination of soft lithography and volume expansion induced self-folding. Bilayer structures are produced by solvent casting and photocuring of liquid resins. They curl into three-dimensional (3D) structures upon contacting with water due to differential swelling of the two layers. The curvature can be controlled by adjusting the polymer composition of the primary swelling layer. A simple semiempirical mathematical model is used to predict this self-folding behavior. By designing the two-dimensional (2D) shapes of the bilayers, this technique can lead to complicated 3D microstructures.
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Affiliation(s)
- Jingjiao Guan
- Biomedical Engineering Center and Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
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30
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Abstract
In this work, the effect of multivalent ions on electroosmotic flow is investigated for multiple electrolyte components. The cases studied include incorporating Ca2+ and HPO4(2-) and other monovalent ions, such as K+ and H2PO4-, into an aqueous NaCl solution. The governing equations are derived and solved numerically. The boundary conditions for the governing equations are obtained from the electrochemical equilibrium requirements. In comparison with monovalent ions, the results show that in micro- and nanochannels having fixed surface charges, multivalent counterions, even in very small amounts, reduce electroosmotic flow significantly, while the multivalent co-ions have little effect on the electroosmotic flow. Due to the enhanced ion-wall interactions multivalent counterions compose the majority of ions in the electric double layer (EDL), causing a decrease of net charge at the surface.
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Affiliation(s)
- Zhi Zheng
- Biomedical Engineering Center, The Ohio State University, Columbus 43210-1107, USA
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31
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Abstract
The ability to create biocompatible well-controlled membranes has been an area of great interest over the last few years, particularly for biosensor applications. The present study describes the fabrication and characterization of novel nanoporous micromachined membranes that exhibit selective permeability and low biofouling. Results indicate that such membranes can be fabricated with uniform pore sizes capable of the simultaneous exclusion of albumin and diffusion of glucose. Compared to polymeric membranes of similar pore size, micromachined silicon membranes allowed more than twice the amount of glucose diffusion after 240 min and complete albumin exclusion. Moreover, membranes exhibit no morphological change or degradability in the presence of biological proteins and fluids at 37 degrees C. The results point to the potential of using such membranes for implantable biosensor applications. With monodisperse pores sizes as small as 10 nm, these membranes offer advantages in their reproducibility, stability, and ability to be integrated in silicon-based biosensing technology.
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Affiliation(s)
- T A Desai
- Department of Bioengineering, University of Illinois at Chicago, 60607, USA.
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Abstract
As a novel therapeutic application of microfabrication technology, a micromachined membrane-based biocapsule is described for the transplantation of protein-secreting cells without the need for immunosuppression. This new approach to cell encapsulation is based on microfabrication technology whereby immunoisolation membranes are bulk and surface micromachined to present uniform and well-controlled pore sizes as small as 10 nm, tailored surface chemistries, and precise microarchitecture. Through its ability to achieve highly controlled microarchitectures on size scales relevant to living systems (from microm to nm), microfabrication technology offers unique opportunities to more precisely engineer biocapsules that allow free exchange of the nutrients, waste products, and secreted therapeutic proteins between the host (patient) and implanted cells, but exclude lymphocytes and antibodies that may attack foreign cells. Microfabricated inorganic encapsulation devices may provide biocompatibility, in vivo chemical and mechanical stability, tailored pore geometries, and superior immunoisolation for encapsulated cells over conventional encapsulation approaches. By using microfabrication techniques, structures can be fabricated with spatial features from the sub-micron range up to several millimeters. These multi-scale structures correspond well with hierarchical biological structures, from proteins and sub-cellular organelles to the tissue and organ levels.
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Affiliation(s)
- T A Desai
- Department of Bioengineering, College of Engineering, University of Illinois at Chicago, 60607-7052, USA.
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