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Salehi A, Sprejz S, Ruehl H, Olayioye M, Cattaneo G. An imprint-based approach to replicate nano- to microscale roughness on gelatin hydrogel scaffolds: surface characterization and effect on endothelialization. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2024; 35:1214-1235. [PMID: 38431849 DOI: 10.1080/09205063.2024.2322771] [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: 09/20/2023] [Accepted: 02/19/2024] [Indexed: 03/05/2024]
Abstract
Biologization of biomaterials with endothelial cells (ECs) is an important step in vascular tissue engineering, aiming at improving hemocompatibility and diminishing the thrombo-inflammatory response of implants. Since subcellular topography in the scale of nano to micrometers can influence cellular adhesion, proliferation, and differentiation, we here investigate the effect of surface roughness on the endothelialization of gelatin hydrogel scaffolds. Considering the micron and sub-micron features of the different native tissues underlying the endothelium in the body, we carried out a biomimetic approach to replicate the surface roughness of tissues and analyzed how this impacted the adhesion and proliferation of human umbilical endothelial cells (HUVECs). Using an imprinting technique, nano and micro-roughness ranging from Sa= 402 nm to Sa= 8 μm were replicated on the surface of gelatin hydrogels. Fluorescent imaging of HUVECs on consecutive days after seeding revealed that microscale topographies negatively affect cell spreading and proliferation. By contrast, nanoscale roughnesses of Sa= 402 and Sa= 538 nm promoted endothelialization as evidenced by the formation of confluent cell monolayers with prominent VE-cadherin surface expression. Collectively, we present an affordable and flexible imprinting method to replicate surface characteristics of tissues on hydrogels and demonstrate how nanoscale roughness positively supports their endothelialization.
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Affiliation(s)
- Ali Salehi
- Institute of Biomedical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Stefanie Sprejz
- Institute of Biomedical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Holger Ruehl
- Institute for Micro Integration, University of Stuttgart, Stuttgart, Germany
| | - Monilola Olayioye
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Giorgio Cattaneo
- Institute of Biomedical Engineering, University of Stuttgart, Stuttgart, Germany
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2
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Bessho T, Takagi T, Igawa K, Sato K. Gelatin-based cell culture device for construction and X-ray irradiation of a three-dimensional oral cancer model. ANAL SCI 2023; 39:771-778. [PMID: 36848001 DOI: 10.1007/s44211-023-00308-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 02/19/2023] [Indexed: 03/01/2023]
Abstract
Bioassays using three-dimensional (3D) tissue models offer several advantages over 2D culture assays because they can reproduce the structure and function of native tissues. In this study, we used our newly designed gelatin device to generate a miniature 3D model of human oral squamous cell carcinoma with stroma and blood vessels. To enable air-liquid interface culture, we conceived a new device structure in which three wells were lined up and separated by a dividing thread; the wells could be connected by removing the dividing thread. Cells were seeded in the center well with the dividing thread to form a multilayer, followed by the supply of media from the side wells after thread removal. Human oral squamous cell carcinoma (HSC-4) cells, human umbilical vein endothelial cells (HUVECs), and normal human dermal fibroblasts (NHDFs) were successfully cocultured, resulting in structures that mimicked 3D-cancer tissues. This 3D-cancer model was subjected to an X-ray sensitivity assay, followed by the evaluation of DNA damage using confocal microscopy and section-scanning electron microscopy.
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Affiliation(s)
- Tomoka Bessho
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo, Tokyo, 112-8681, Japan
| | - Tomoko Takagi
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo, Tokyo, 112-8681, Japan
| | - Kazuyo Igawa
- Neutron Therapy Research Center, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8558, Japan
| | - Kae Sato
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo, Tokyo, 112-8681, Japan.
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3
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Sasaki S, Suzuki T, Morikawa K, Matsusaki M, Sato K. Fabrication of a Gelatin-Based Microdevice for Vascular Cell Culture. MICROMACHINES 2022; 14:107. [PMID: 36677169 PMCID: PMC9860854 DOI: 10.3390/mi14010107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/27/2022] [Accepted: 12/28/2022] [Indexed: 06/17/2023]
Abstract
This study presents a novel technique for fabricating microfluidic devices with microbial transglutaminase-gelatin gels instead of polydimethylsiloxane (PDMS), in which flow culture simulates blood flow and a capillary network is incorporated for assays of vascular permeability or angiogenesis. We developed a gelatin-based device with a coverslip as the bottom, which allows the use of high-magnification lenses with short working distances, and we observed the differences in cell dynamics on gelatin, glass, and PDMS surfaces. The tubes of the gelatin microfluidic channel are designed to be difficult to pull out of the inlet hole, making sample introduction easy, and the gelatin channel can be manipulated from the cell introduction to the flow culture steps in a manner comparable to that of a typical PDMS channel. Human umbilical vein endothelial cells (HUVECs) and normal human dermal fibroblasts (NHDFs) were successfully co-cultured, resulting in structures that mimicked blood vessels with inner diameters ranging from 10 µm to 500 µm. Immunostaining and scanning electron microscopy results showed that the affinity of fibronectin for gelatin was stronger than that for glass or PDMS, making gelatin a suitable substrate for cell adhesion. The ability for microscopic observation at high magnification and the ease of sample introduction make this device easier to use than conventional gelatin microfluidics, and the above-mentioned small modifications in the device structure are important points that improve its convenience as a cell assay device.
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Affiliation(s)
- Satoko Sasaki
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo, Tokyo 112-8681, Japan
| | - Tomoko Suzuki
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo, Tokyo 112-8681, Japan
| | - Kyojiro Morikawa
- Institute of Nanoengineering and Microsystems, Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu 300044, Taiwan
- Collaborative Research Organization for Micro and Nano Multifunctional Devices, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Michiya Matsusaki
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 1-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kae Sato
- Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, 2-8-1 Mejirodai, Bunkyo, Tokyo 112-8681, Japan
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4
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Wang X, Chan V, Corridon PR. Acellular Tissue-Engineered Vascular Grafts from Polymers: Methods, Achievements, Characterization, and Challenges. Polymers (Basel) 2022; 14:polym14224825. [PMID: 36432950 PMCID: PMC9695055 DOI: 10.3390/polym14224825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/03/2022] [Accepted: 11/03/2022] [Indexed: 11/11/2022] Open
Abstract
Extensive and permanent damage to the vasculature leading to different pathogenesis calls for developing innovative therapeutics, including drugs, medical devices, and cell therapies. Innovative strategies to engineer bioartificial/biomimetic vessels have been extensively exploited as an effective replacement for vessels that have seriously malfunctioned. However, further studies in polymer chemistry, additive manufacturing, and rapid prototyping are required to generate highly engineered vascular segments that can be effectively integrated into the existing vasculature of patients. One recently developed approach involves designing and fabricating acellular vessel equivalents from novel polymeric materials. This review aims to assess the design criteria, engineering factors, and innovative approaches for the fabrication and characterization of biomimetic macro- and micro-scale vessels. At the same time, the engineering correlation between the physical properties of the polymer and biological functionalities of multiscale acellular vascular segments are thoroughly elucidated. Moreover, several emerging characterization techniques for probing the mechanical properties of tissue-engineered vascular grafts are revealed. Finally, significant challenges to the clinical transformation of the highly promising engineered vessels derived from polymers are identified, and unique perspectives on future research directions are presented.
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Affiliation(s)
- Xinyu Wang
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
- Department of Immunology and Physiology, College of Medicine and Health Sciences, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
| | - Vincent Chan
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
- Correspondence: (V.C.); (P.R.C.)
| | - Peter R. Corridon
- Department of Biomedical Engineering and Healthcare Engineering Innovation Center, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
- Department of Immunology and Physiology, College of Medicine and Health Sciences, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
- Center for Biotechnology, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
- Correspondence: (V.C.); (P.R.C.)
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5
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Badr-Eldin SM, Aldawsari HM, Kotta S, Deb PK, Venugopala KN. Three-Dimensional In Vitro Cell Culture Models for Efficient Drug Discovery: Progress So Far and Future Prospects. Pharmaceuticals (Basel) 2022; 15:926. [PMID: 36015074 PMCID: PMC9412659 DOI: 10.3390/ph15080926] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 07/16/2022] [Accepted: 07/18/2022] [Indexed: 12/13/2022] Open
Abstract
Despite tremendous advancements in technologies and resources, drug discovery still remains a tedious and expensive process. Though most cells are cultured using 2D monolayer cultures, due to lack of specificity, biochemical incompatibility, and cell-to-cell/matrix communications, they often lag behind in the race of modern drug discovery. There exists compelling evidence that 3D cell culture models are quite promising and advantageous in mimicking in vivo conditions. It is anticipated that these 3D cell culture methods will bridge the translation of data from 2D cell culture to animal models. Although 3D technologies have been adopted widely these days, they still have certain challenges associated with them, such as the maintenance of a micro-tissue environment similar to in vivo models and a lack of reproducibility. However, newer 3D cell culture models are able to bypass these issues to a maximum extent. This review summarizes the basic principles of 3D cell culture approaches and emphasizes different 3D techniques such as hydrogels, spheroids, microfluidic devices, organoids, and 3D bioprinting methods. Besides the progress made so far in 3D cell culture systems, the article emphasizes the various challenges associated with these models and their potential role in drug repositioning, including perspectives from the COVID-19 pandemic.
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Affiliation(s)
- Shaimaa M. Badr-Eldin
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (H.M.A.); (S.K.)
- Center of Excellence for Drug Research and Pharmaceutical Industries, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Hibah M. Aldawsari
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (H.M.A.); (S.K.)
- Center of Excellence for Drug Research and Pharmaceutical Industries, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Sabna Kotta
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (H.M.A.); (S.K.)
- Center of Excellence for Drug Research and Pharmaceutical Industries, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Pran Kishore Deb
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Philadelphia University, P.O. Box 1, Amman 19392, Jordan
| | - Katharigatta N. Venugopala
- Department of Pharmaceutical Sciences, College of Clinical Pharmacy, King Faisal University, Al-Ahsa 31982, Saudi Arabia;
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, Durban 4001, South Africa
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6
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Agrawal A, Yıldız ÜY, Hussain CG, Kailasa SK, Keçili R, Hussain CM. Greenness of lab-on-a-chip devices for analytical processes: Advances & future prospects. J Pharm Biomed Anal 2022; 219:114914. [PMID: 35843186 DOI: 10.1016/j.jpba.2022.114914] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 06/22/2022] [Accepted: 06/25/2022] [Indexed: 11/25/2022]
Abstract
Lab-on-a-chip devices have now-a-days become an important aspect of analytical/bioanalytical chemistry having wide range of applications including clinical diagnosis, drug screening, cell biology, environmental monitoring, food safety analysis etc. Conventional lab-on-a-chip devices generally employ chemicals that are not environmentally friendly and were commonly fabricated on hard plastic platform which are non-degradable and hence ignore the importance of green analytical chemistry. In today's scenario, it is highly imperative to protect our environment by using less toxic and environmentally friendly chemicals/solvents and biocompatible platforms. Accordingly, the present article comprehensively reviews on the various green aspects of lab-on-a-chip devices for analytical processes which aim at fabricating environmentally friendly and cost-effective downsized devices so that the risk factor at the user's end upon longer exposure as well as to the environment can be reduced. The decisive factors for the accomplishment of green aspects of lab-on-a-chip devices including sample preparation using lab-on-a-chip systems to minimize the amount of sample/solvents to few microliters only, substitution of harmful solvents with green alternatives, minimal waste generation or proper treatment of waste and biodegradable and biocompatible platforms for fabricating lab-on-a-chip devices have been discussed in details. Additionally, the challenges that may hinder their commercialization are also critically discussed.
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Affiliation(s)
- Arpana Agrawal
- Department of Physics, Shri Neelkantheshwar Government Post-Graduate College, Khandwa 450001, India
| | - Ümit Yılmaz Yıldız
- Department of Medical Services and Techniques, Yunus Emre Vocational School of Health Services, Anadolu University, 26470 Eskişehir, Turkey
| | | | - Suresh Kumar Kailasa
- Department of Chemistry, Sardar Vallabhbhai National Institute of Technology, Surat, 395 007, Gujarat, India
| | - Rüstem Keçili
- Department of Medical Services and Techniques, Yunus Emre Vocational School of Health Services, Anadolu University, 26470 Eskişehir, Turkey
| | - Chaudhery Mustansar Hussain
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA.
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7
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Bio-actuated microvalve in microfluidics using sensing and actuating function of Mimosa pudica. Sci Rep 2022; 12:7653. [PMID: 35606389 PMCID: PMC9126872 DOI: 10.1038/s41598-022-11637-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Accepted: 04/26/2022] [Indexed: 11/25/2022] Open
Abstract
Bio-actuators and sensors are increasingly employed in microscale devices for numerous applications. Unlike other artificial devices actuated by living cells or tissues, here we introduce a microvalve system actuated by the stimuli-responsive action plant, Mimosa pudica (sleepy plant). This system realizes the control of the valve to open and close by dropping and recovering responses of Mimosa pudica branch upon external physical stimulations. The results showed that one matured single uncut Mimosa pudica branch produced average force of 15.82 ± 0.7 mN. This force was sufficient for actuating and keeping the valve open for 8.46 ± 1.33 min in a stimulation-recovering cycle of 30 min. Additionally, two separately cut Mimosa pudica branches were able to keep the valve open for 2.28 ± 0.63 min in a stimulating-recovering cycle of 20min. The pressure resistance and the response time of the valve were 4.2 kPa and 1.4 s, respectively. This demonstration of plant-microfluidics integration encourages exploiting more applications of microfluidic platforms that involve plant science and plant energy harvesting.
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Sengupta J, Hussain CM. Prospective pathways of green graphene-based lab-on-chip devices: the pursuit toward sustainability. Mikrochim Acta 2022; 189:177. [PMID: 35381890 PMCID: PMC8982660 DOI: 10.1007/s00604-022-05286-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 03/17/2022] [Indexed: 12/22/2022]
Abstract
At present, analytical lab-on-chip devices find their usage in different facets of chemical analysis, biological analysis, point of care analysis, biosensors, etc. In addition, graphene has already established itself as an essential component of advanced lab-on-chip devices. Graphene-based lab-on-chip devices have achieved appreciable admiration because of their peerless performance in comparison to others. However, to accomplish a sustainable future, a device must undergo “green screening” to check its environmental compatibility. Thus, extensive research is carried out globally to make the graphene-based lab-on-chip green, though it is yet to be achieved. Nevertheless, as a ray of hope, there are few existing strategies that can be stitched together for feasible fabrication of environment-friendly green graphene-based analytical lab-on-chip, and those prospective pathways are reviewed in this paper.
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Affiliation(s)
- Joydip Sengupta
- Department of Electronic Science, Jogesh Chandra Chaudhuri College, Kolkata - 700033, India
| | - Chaudhery Mustansar Hussain
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ, 07102, USA.
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9
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IKEDA S, SEKINE S, BESSHO T, OTSUKI H, SIBATA S, NAKANO M, SATO K. Development of Gelatin Well Device for Cell Culture. BUNSEKI KAGAKU 2022. [DOI: 10.2116/bunsekikagaku.71.289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Suzune IKEDA
- Department of Chemical and Biological Sciences, Japan Women’s University
| | - Shino SEKINE
- Department of Chemical and Biological Sciences, Japan Women’s University
| | - Tomoka BESSHO
- Department of Chemical and Biological Sciences, Japan Women’s University
| | - Haruka OTSUKI
- Department of Chemical and Biological Sciences, Japan Women’s University
| | - Saki SIBATA
- Department of Chemical and Biological Sciences, Japan Women’s University
| | - Miku NAKANO
- Department of Chemical and Biological Sciences, Japan Women’s University
| | - Kae SATO
- Department of Chemical and Biological Sciences, Japan Women’s University
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10
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Buchanan BC, Yoon JY. Microscopic Imaging Methods for Organ-on-a-Chip Platforms. MICROMACHINES 2022; 13:328. [PMID: 35208453 PMCID: PMC8879989 DOI: 10.3390/mi13020328] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/15/2022] [Accepted: 02/15/2022] [Indexed: 02/06/2023]
Abstract
Microscopic imaging is essential and the most popular method for in situ monitoring and evaluating the outcome of various organ-on-a-chip (OOC) platforms, including the number and morphology of mammalian cells, gene expression, protein secretions, etc. This review presents an overview of how various imaging methods can be used to image organ-on-a-chip platforms, including transillumination imaging (including brightfield, phase-contrast, and holographic optofluidic imaging), fluorescence imaging (including confocal fluorescence and light-sheet fluorescence imaging), and smartphone-based imaging (including microscope attachment-based, quantitative phase, and lens-free imaging). While various microscopic imaging methods have been demonstrated for conventional microfluidic devices, a relatively small number of microscopic imaging methods have been demonstrated for OOC platforms. Some methods have rarely been used to image OOCs. Specific requirements for imaging OOCs will be discussed in comparison to the conventional microfluidic devices and future directions will be introduced in this review.
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Affiliation(s)
| | - Jeong-Yeol Yoon
- Department of Biomedical Engineering, The University of Arizona, Tucson, AZ 85721, USA;
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11
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Russo M, Cejas CM, Pitingolo G. Advances in microfluidic 3D cell culture for preclinical drug development. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2022; 187:163-204. [PMID: 35094774 DOI: 10.1016/bs.pmbts.2021.07.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Drug development is often a very long, costly, and risky process due to the lack of reliability in the preclinical studies. Traditional current preclinical models, mostly based on 2D cell culture and animal testing, are not full representatives of the complex in vivo microenvironments and often fail. In order to reduce the enormous costs, both financial and general well-being, a more predictive preclinical model is needed. In this chapter, we review recent advances in microfluidic 3D cell culture showing how its development has allowed the introduction of in vitro microphysiological systems, laying the foundation for organ-on-a-chip technology. These findings provide the basis for numerous preclinical drug discovery assays, which raise the possibility of using micro-engineered systems as emerging alternatives to traditional models, based on 2D cell culture and animals.
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Affiliation(s)
- Maria Russo
- Microfluidics, MEMS, Nanostructures (MMN), CNRS UMR 8231, Institut Pierre Gilles de Gennes (IPGG) ESPCI Paris, PSL Research University, Paris France.
| | - Cesare M Cejas
- Microfluidics, MEMS, Nanostructures (MMN), CNRS UMR 8231, Institut Pierre Gilles de Gennes (IPGG) ESPCI Paris, PSL Research University, Paris France
| | - Gabriele Pitingolo
- Bioassays, Microsystems and Optical Engineering Unit, BIOASTER, Paris France
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12
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Ma Q, Xu J. Green microfluidics in microchemical engineering for carbon neutrality. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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13
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Song K, Ren B, Zhai Y, Chai W, Huang Y. Effects of transglutaminase cross-linking process on printability of gelatin microgel-gelatin solution composite bioink. Biofabrication 2021; 14. [PMID: 34823234 DOI: 10.1088/1758-5090/ac3d75] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 11/25/2021] [Indexed: 11/12/2022]
Abstract
Three-dimensional (3D) bioprinting has emerged as a powerful engineering approach for various tissue engineering applications, particularly for the development of 3D cellular structures with unique mechanical and/or biological properties. For the jammed gelatin microgel-gelatin solution composite bioink, comprising a discrete phase of microgels (enzymatically gelled gelatin microgels) and a cross-linkable continuous gelatin precursor solution-based phase containing transglutaminase (TG), its rheological properties and printability change gradually due to the TG enzyme-induced cross-linking process. The objective of this study is to establish a direct mapping between the printability of the gelatin microgel-gelatin solution based cross-linkable composite bioink and the TG concentration and cross-linking time, respectively. Due to the inclusion of TG in the composite bioink, the bioink starts cross-linking once prepared and is usually prepared right before a printing process. Herein, the bioink printability is evaluated based on the three metrics: injectability, feature formability, and process-induced cell injury. In this study, the rheological properties such as the storage modulus and viscosity have been first systematically investigated and predicted at different TG concentrations and times during the cross-linking process using the first-order cross-linking kinetics model. The storage modulus and viscosity have been satisfactorily modeled as exponential functions of the TG concentration and time with an experimentally calibrated cross-linking kinetic rate constant. Furthermore, the injectability, feature formability, and process-induced cell injury have been successfully correlated to the TG concentration and cross-linking time via the storage modulus, viscosity, and/or process-induced shear stress. By combing the good injectability, good feature formability, and satisfactory cell viability zones, a good printability zone (1.65, 0.61, and 0.31 h for the composite bioinks with 1.00, 2.00, and 4.00% w/v TG, respectively) has been established during the printing of mouse fibroblast-based 2% gelatin B microgel-3% gelatin B solution composite bioink. This printability zone approach can be extended to the use of other cross-linkable bioinks for bioprinting applications.
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Affiliation(s)
- Kaidong Song
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States of America
| | - Bing Ren
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States of America
| | - Yingnan Zhai
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States of America
| | - Wenxuan Chai
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States of America
| | - Yong Huang
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States of America.,Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, United States of America
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14
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Conductive Bioimprint Using Soft Lithography Technique Based on PEDOT:PSS for Biosensing. Bioengineering (Basel) 2021; 8:bioengineering8120204. [PMID: 34940357 PMCID: PMC8699003 DOI: 10.3390/bioengineering8120204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/01/2021] [Accepted: 12/03/2021] [Indexed: 11/17/2022] Open
Abstract
Culture platform surface topography plays an important role in the regulation of biological cell behaviour. Understanding the mechanisms behind the roles of surface topography in cell response are central to many developments in a Lab on a Chip, medical implants and biosensors. In this work, we report on a novel development of a biocompatible conductive hydrogel (CH) made of poly (3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and gelatin with bioimprinted surface features. The bioimprinted CH offers high conductivity, biocompatibility and high replication fidelity suitable for cell culture applications. The bioimprinted conductive hydrogel is developed to investigate biological cells’ response to their morphological footprint and study their growth, adhesion, cell–cell interactions and proliferation as a function of conductivity. Moreover, optimization of the conductive hydrogel mixture plays an important role in achieving high imprinting resolution and conductivity. The reason behind choosing a conducive hydrogel with high resolution surface bioimprints is to improve cell monitoring while mimicking cells’ natural physical environment. Bioimprints which are a 3D replication of cellular morphology have previously been shown to promote cell attachment, proliferation, differentiation and even cell response to drugs. The conductive substrate, on the other hand, enables cell impedance to be measured and monitored, which is indicative of cell viability and spread. Two dimensional profiles of the cross section of a single cell taken via Atomic Force Microscopy (AFM) from the fixed cell on glass, and its replicas on polydimethylsiloxane (PDMS) and conductive hydrogel (CH) show unprecedented replication of cellular features with an average replication fidelity of more than 90%. Furthermore, crosslinking CH films demonstrated a significant increase in electrical conductivity from 10−6 S/cm to 1 S/cm. Conductive bioimprints can provide a suitable platform for biosensing applications and potentially for monitoring implant-tissue reactions in medical devices.
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15
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Agrawal A, Keçili R, Ghorbani-Bidkorbeh F, Hussain CM. Green miniaturized technologies in analytical and bioanalytical chemistry. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116383] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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16
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Vera D, García-Díaz M, Torras N, Álvarez M, Villa R, Martinez E. Engineering Tissue Barrier Models on Hydrogel Microfluidic Platforms. ACS APPLIED MATERIALS & INTERFACES 2021; 13:13920-13933. [PMID: 33739812 DOI: 10.1021/acsami.0c21573] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Tissue barriers play a crucial role in human physiology by establishing tissue compartmentalization and regulating organ homeostasis. At the interface between the extracellular matrix (ECM) and flowing fluids, epithelial and endothelial barriers are responsible for solute and gas exchange. In the past decade, microfluidic technologies and organ-on-chip devices became popular as in vitro models able to recapitulate these biological barriers. However, in conventional microfluidic devices, cell barriers are primarily grown on hard polymeric membranes within polydimethylsiloxane (PDMS) channels that do not mimic the cell-ECM interactions nor allow the incorporation of other cellular compartments such as stromal tissue or vascular structures. To develop models that accurately account for the different cellular and acellular compartments of tissue barriers, researchers have integrated hydrogels into microfluidic setups for tissue barrier-on-chips, either as cell substrates inside the chip, or as self-contained devices. These biomaterials provide the soft mechanical properties of tissue barriers and allow the embedding of stromal cells. Combining hydrogels with microfluidics technology provides unique opportunities to better recreate in vitro the tissue barrier models including the cellular components and the functionality of the in vivo tissues. Such platforms have the potential of greatly improving the predictive capacities of the in vitro systems in applications such as drug development, or disease modeling. Nevertheless, their development is not without challenges in their microfabrication. In this review, we will discuss the recent advances driving the fabrication of hydrogel microfluidic platforms and their applications in multiple tissue barrier models.
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Affiliation(s)
- Daniel Vera
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Bellaterra, Barcelona 08193, Spain
- Biomimetic Systems for Cell Engineering, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
| | - María García-Díaz
- Biomimetic Systems for Cell Engineering, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
| | - Núria Torras
- Biomimetic Systems for Cell Engineering, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
| | - Mar Álvarez
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Bellaterra, Barcelona 08193, Spain
| | - Rosa Villa
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Bellaterra, Barcelona 08193, Spain
- Centro de Investigación Biomédica en Red (CIBER), Madrid 28029, Spain
| | - Elena Martinez
- Biomimetic Systems for Cell Engineering, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
- Centro de Investigación Biomédica en Red (CIBER), Madrid 28029, Spain
- Department of Electronics and Biomedical Engineering, University of Barcelona (UB), Barcelona 08028, Spain
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17
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Nie J, Fu J, He Y. Hydrogels: The Next Generation Body Materials for Microfluidic Chips? SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2003797. [PMID: 33103353 DOI: 10.1002/smll.202003797] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/20/2020] [Indexed: 05/27/2023]
Abstract
The integration of microfluidics with biomedical research is confronted with considerable limitations due to its body materials. With high content of water, hydrogels own superior biocompatibility and degradability. Can hydrogels become another material choice for the construction of microfluidic chips, particularly biofluidics? The present review aims to systematically establish the concept of hydrogel-based microfluidic chips (HMCs) and address three main concerns: i) why choosing hydrogels? ii) how to fabricate HMCs?, and iii) in which fields to apply HMCs? It is envisioned that hydrogels may be used increasingly as substitute for traditional materials and gradually act as the body material for microfluidic chips. The modifications of conventional process are highlighted to overcome issues arising from the incompatibility between the construction methods and hydrogel materials. Specifically targeting at the "soft and wet" hydrogels, an efficient flowchart of "i) high resolution template printing; ii) damage-free demolding; iii) twice-crosslinking bonding" is proposed. Accordingly, a broader microfluidic chip concept is proposed in terms of form and function. Potential biomedical applications of HMCs are discussed. This review also highlights the challenges arising from the material replacement, as well as the future directions of the proposed concept. Finally, the authors' viewpoints and perspectives for this emerging field are discussed.
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Affiliation(s)
- Jing Nie
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Jianzhong Fu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yong He
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Materials Processing and Mold, Zhengzhou University, Zhengzhou, 450002, China
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18
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Xu Y, Jacquat RPB, Shen Y, Vigolo D, Morse D, Zhang S, Knowles TPJ. Microfluidic Templating of Spatially Inhomogeneous Protein Microgels. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2000432. [PMID: 32529798 DOI: 10.1002/smll.202000432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 04/20/2020] [Accepted: 05/18/2020] [Indexed: 05/20/2023]
Abstract
3D scaffolds in the form of hydrogels and microgels have allowed for more native cell-culture systems to be developed relative to flat substrates. Native biological tissues are, however, usually spatially inhomogeneous and anisotropic, but regulating the spatial density of hydrogels at the microscale to mimic this inhomogeneity has been challenging to achieve. Moreover, the development of biocompatible synthesis approaches for protein-based microgels remains challenging, and typical gelation conditions include UV light, extreme pH, extreme temperature, or organic solvents, factors which can compromise the viability of cells. This study addresses these challenges by demonstrating an approach to fabricate protein microgels with controllable radial density through microfluidic mixing and physical and enzymatic crosslinking of gelatin precursor molecules. Microgels with a higher density in their cores and microgels with a higher density in their shells are demonstrated. The microgels have robust stability at 37 °C and different dissolution rates through enzymolysis, which can be further used for gradient scaffolds for 3D cell culture, enabling controlled degradability, and the release of biomolecules. The design principles of the microgels could also be exploited to generate other soft materials for applications ranging from novel protein-only micro reactors to soft robots.
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Affiliation(s)
- Yufan Xu
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Raphaël P B Jacquat
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
- Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK
| | - Yi Shen
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Daniele Vigolo
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - David Morse
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
- Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Shuyuan Zhang
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Tuomas P J Knowles
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
- Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK
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19
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Distler T, McDonald K, Heid S, Karakaya E, Detsch R, Boccaccini AR. Ionically and Enzymatically Dual Cross-Linked Oxidized Alginate Gelatin Hydrogels with Tunable Stiffness and Degradation Behavior for Tissue Engineering. ACS Biomater Sci Eng 2020; 6:3899-3914. [PMID: 33463325 DOI: 10.1021/acsbiomaterials.0c00677] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hydrogels that allow for the successful long-term in vitro culture of cell-biomaterial systems to enable the maturation of tissue engineering constructs are highly relevant in regenerative medicine. Naturally derived polysaccharide-based hydrogels promise to be one material group with enough versatility and chemical functionalization capability to tackle the challenges associated with long-term cell culture. We report a marine derived oxidized alginate, alginate dialdehyde (ADA), and gelatin (GEL) system (ADA-GEL), which is cross-linked via ionic (Ca2+) and enzymatic (microbial transglutaminase, mTG) interaction to form dually cross-linked hydrogels. The cross-linking approach allowed us to tailor the stiffness of the hydrogels in a wide range (from <5 to 120 kPa), without altering the initial ADA and GEL hydrogel chemistry. It was possible to control the degradation behavior of the hydrogels to be stable for up to 30 days of incubation. Increasing concentrations of mTG cross-linker solutions allowed us to tune the degradation behavior of the ADA-GEL hydrogels from fast (<7 days) to moderate (14 days) and slow (>30 days) degradation kinetics. The cytocompatibility of mTG cross-linked ADA-GEL was assessed using NIH-3T3 fibroblasts and ATDC-5 mouse teratocarcinoma cells. Both cell types showed highly increased cellular attachment on mTG cross-linked ADA-GEL in comparison to Ca2+ cross-linked hydrogels. In addition, ATDC-5 cells showed a higher proliferation on mTG cross-linked ADA-GEL hydrogels in comparison to tissue culture polystyrene control substrates. Further, the attachment of human umbilical vein endothelial cells (HUVEC) on ADA-GEL (+) mTG was confirmed, proving the suitability of mTG+Ca2+ cross-linked ADA-GEL for several cell types. Summarizing, a promising platform to control the properties of ADA-GEL hydrogels is presented, with the potential to be applied in long-term cell culture investigations such as cartilage, bone, and blood-vessel engineering, as well as for biofabrication.
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Affiliation(s)
- Thomas Distler
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Kilian McDonald
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Susanne Heid
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Emine Karakaya
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Rainer Detsch
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
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20
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Shimizu A, Goh WH, Itai S, Hashimoto M, Miura S, Onoe H. ECM-based microchannel for culturing in vitro vascular tissues with simultaneous perfusion and stretch. LAB ON A CHIP 2020; 20:1917-1927. [PMID: 32307467 DOI: 10.1039/d0lc00254b] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We present an extracellular matrix (ECM)-based stretchable microfluidic system for culturing in vitro three-dimensional (3D) vascular tissues, which mimics in vivo blood vessels. Human umbilical vein endothelial cells (HUVECs) can be cultured under perfusion and stretch simultaneously with real-time imaging by our proposed system. Our ECM (transglutaminase (TG) cross-linked gelatin)-based microchannel was fabricated by dissolving water-soluble sacrificial polyvinyl alcohol (PVA) molds printed with a 3D printer. Flows in the microchannel were analyzed under perfusion and stretch. We demonstrated simultaneous perfusion and stretch of TG gelatin-based microchannels culturing HUVECs. We suggest that our TG gelatin-based stretchable microfluidic system proves to be a useful tool for understanding the mechanisms of vascular tissue formation and mechanotransduction.
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Affiliation(s)
- Azusa Shimizu
- School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-Ku, Yokohama, 223-8522, Japan.
| | - Wei Huang Goh
- Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
| | - Shun Itai
- School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-Ku, Yokohama, 223-8522, Japan.
| | - Michinao Hashimoto
- Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore and Digital Manufacturing and Design (DManD) Centre, Singapore University of Technology and Design, Singapore
| | - Shigenori Miura
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8505, Japan
| | - Hiroaki Onoe
- School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-Ku, Yokohama, 223-8522, Japan. and Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-Ku, Yokohama, 223-8522, Japan
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21
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Hussein KH, Park KM, Yu L, Song SH, Woo HM, Kwak HH. Vascular reconstruction: A major challenge in developing a functional whole solid organ graft from decellularized organs. Acta Biomater 2020; 103:68-80. [PMID: 31887454 DOI: 10.1016/j.actbio.2019.12.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 12/18/2019] [Accepted: 12/19/2019] [Indexed: 02/07/2023]
Abstract
Bioengineering a functional organ holds great potential to overcome the current gap between the organ need and shortage of available organs. Whole organ decellularization allows the removal of cells from large-scale organs, leaving behind extracellular matrices containing different growth factors, structural proteins, and a vascular network with a bare surface. Successful application of decellularized tissues as transplantable organs is hampered by the inability to completely reline the vasculature by endothelial cells (ECs), leading to blood coagulation, loss of vascular patency, and subsequent death of reseeded cells. Therefore, an intact, continuous layer of endothelium is essential to maintain proper functioning of the vascular system, which includes the transfer of nutrients to surrounding tissues and protecting other types of cells from shear stress. Here, we aimed to summarize the available cell sources that can be used for reendothelialization in addition to different trials performed by researchers to reconstruct vascularization of decellularized solid organs. Additionally, different techniques for enhancing reendothelialization and the methods used for evaluating reendothelialization efficiency along with the future prospective applications of this field are discussed. STATEMENT OF SIGNIFICANCE: Despite the great progress in whole organ decellularization, reconstruction of vasculature within the engineered constructs is still a major roadblock. Reconstructed endothelium acts as a multifunctional barrier of vessels, which can reduce thrombosis and help delivering of oxygen and nutrients throughout the whole organ. Successful reendothelialization can be achieved through reseeding of appropriate cell types on the naked vasculature with or without modification of its surface. Here, we present the current research milestones that so far established to reconstruct the vascular network in addition to the methods used for evaluating the efficiency of reendotheilization. Thus, this review is quite significant and will aid the researchers to know where we stand toward biofabricating a transplantable organ from decellularizd extracellular matrix.
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22
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Shen C, Li Y, Wang Y, Meng Q. Non-swelling hydrogel-based microfluidic chips. LAB ON A CHIP 2019; 19:3962-3973. [PMID: 31656966 DOI: 10.1039/c9lc00564a] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Hydrogel-based microfluidic chips are more biologically relevant than conventional polydimethylsiloxane (PDMS) chips, but the inherent swelling of hydrogels leads to a decrease in mechanical performance and deformation of the as-prepared structure in their manufacture and application processing. Non-swelling hydrogel has, for the first time, been utilized to construct microfluidic chips in this study. It was fabricated by covalently cross-linking the biocompatible copolymer of di-acrylated Pluronic F127 (F127-DA). Thanks to their non-swelling property, the hydrogel-based microfluidic chips maintain their as-prepared mechanical strength and channel morphology when equilibrated in aqueous solution at 37 °C. Moreover, the microfluidic chips are autoclavable and show an appropriately slow degradation rate by remaining stable within 21 days of incubation. Based on these properties, a vessel-on-a-chip was established by seeding human umbilical vein endothelial cells (HUVECs) onto the microchannel surfaces inside the microfluidic chip. Under 6 days of perfusion culture with a physiologically relevant shear stress of 5 dyne per cm2, the HUVECs in the chip show responsivity to fluid shear stress and express higher endothelial functions than the corresponding static culture. Therefore, non-swelling hydrogel-based microfluidic chips could potentially be applicable for cell/tissue-related applications, performing much better than conventional PDMS or existing hydrogel based microfluidic chips.
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Affiliation(s)
- Chong Shen
- College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, PR China.
| | - Yingjun Li
- College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, PR China.
| | - Ying Wang
- College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, PR China.
| | - Qin Meng
- College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, PR China.
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23
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Pahapale GJ, Gao S, Romer LH, Gracias DH. Hierarchically Curved Gelatin for 3D Biomimetic Cell Culture. ACS APPLIED BIO MATERIALS 2019; 2:6004-6011. [DOI: 10.1021/acsabm.9b00916] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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24
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Liu Y, Wu HC, Bhokisham N, Li J, Hong KL, Quan DN, Tsao CY, Bentley WE, Payne GF. Biofabricating Functional Soft Matter Using Protein Engineering to Enable Enzymatic Assembly. Bioconjug Chem 2018; 29:1809-1822. [PMID: 29745651 PMCID: PMC7045599 DOI: 10.1021/acs.bioconjchem.8b00197] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Biology often provides the inspiration for functional soft matter, but biology can do more: it can provide the raw materials and mechanisms for hierarchical assembly. Biology uses polymers to perform various functions, and biologically derived polymers can serve as sustainable, self-assembling, and high-performance materials platforms for life-science applications. Biology employs enzymes for site-specific reactions that are used to both disassemble and assemble biopolymers both to and from component parts. By exploiting protein engineering methodologies, proteins can be modified to make them more susceptible to biology's native enzymatic activities. They can be engineered with fusion tags that provide (short sequences of amino acids at the C- and/or N- termini) that provide the accessible residues for the assembling enzymes to recognize and react with. This "biobased" fabrication not only allows biology's nanoscale components (i.e., proteins) to be engineered, but also provides the means to organize these components into the hierarchical structures that are prevalent in life.
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Affiliation(s)
| | - Hsuan-Chen Wu
- Department of Biochemical Science and Technology , National Taiwan University , Taipei City , Taiwan
| | | | | | - Kai-Lin Hong
- Department of Biochemical Science and Technology , National Taiwan University , Taipei City , Taiwan
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25
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Wang Z, Jin X, Tian Z, Menard F, Holzman JF, Kim K. A Novel, Well-Resolved Direct Laser Bioprinting System for Rapid Cell Encapsulation and Microwell Fabrication. Adv Healthc Mater 2018; 7:e1701249. [PMID: 29405607 DOI: 10.1002/adhm.201701249] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 12/11/2017] [Indexed: 01/03/2023]
Abstract
A direct laser bioprinting (DLBP) system is introduced in this work. The DLBP system applies visible-laser-induced photo-crosslinking at a wavelength of 405 nm using the photoinitiator VA-086. It is shown that such a system can fabricate vertical structures with fine features (less than 50 µm) and high cell viability (greater than 95%). Experimental characterizations and theoretical simulations are presented, and good agreement is seen between the experiments and theory. The DLBP system is applied to the fabrication of (1) cell-laden hydrogel microgrids, (2) hydrogel microwells, as well as a test of (3) cell encapsulation, and (4) cell seeding. The DLBP system is found to be a promising tool for bioprinting.
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Affiliation(s)
- Zongjie Wang
- School of Engineering; University of British Columbia; Kelowna BC V1V 1V7 Canada
| | - Xian Jin
- School of Engineering; University of British Columbia; Kelowna BC V1V 1V7 Canada
| | - Zhenlin Tian
- Department of Chemistry; Irving K Barber School of Arts and Sciences; University of British Columbia; Kelowna BC V1V 1V7 Canada
| | - Frederic Menard
- Department of Chemistry; Irving K Barber School of Arts and Sciences; University of British Columbia; Kelowna BC V1V 1V7 Canada
| | - Jonathan F. Holzman
- School of Engineering; University of British Columbia; Kelowna BC V1V 1V7 Canada
| | - Keekyoung Kim
- School of Engineering; University of British Columbia; Kelowna BC V1V 1V7 Canada
- Biomedical Engineering Program; University of British Columbia; Vancouver BC V6T 1Z4 Canada
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26
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Kim DN, Kim KT, Kim C, Teitell MA, Zangle TA. Soft lithography fabrication of index-matched microfluidic devices for reducing artifacts in fluorescence and quantitative phase imaging. MICROFLUIDICS AND NANOFLUIDICS 2018; 22:2. [PMID: 29725276 PMCID: PMC5927392 DOI: 10.1007/s10404-017-2023-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 11/24/2017] [Indexed: 05/22/2023]
Abstract
Microfluidic devices are widely used for biomedical applications based on microscopy or other optical detection methods. However, the materials commonly used for microfabrication typically have a high refractive index relative to water, which can create artifacts at device edges and limit applicability to applications requiring high precision imaging or morphological feature detection. Here we present a soft lithography method to fabricate microfluidic devices out of MY133-V2000, a UV-curable, fluorinated polymer with low refractive index that is close to that of water (n = 1.33). The primary challenge in the use of this material (and fluorinated materials in general) is the low adhesion of the fluorinated material; we present several alternative fabrication methods we have tested to improve inter-layer adhesion. The close match between the refractive index of this material and aqueous solutions commonly used in biomedical applications enables fluorescence imaging at microchannel or other microfabricated edges without distortion. The close match in refractive index also enables quantitative phase microscopy (QPM) imaging across the full width of microchannels without error-inducing artifacts for measurement of cell biomass. Overall, our results demonstrate the utility of low-refractive index microfluidics for biological applications requiring high precision optical imaging.
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Affiliation(s)
- Diane N.H. Kim
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
| | - Kevin T. Kim
- Department of Neuroscience, UCLA, Los Angeles, California, USA
| | - Carolyn Kim
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
| | - Michael A. Teitell
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, Broad Stem Cell Research Center, California Nanosystems Institute, and Molecular Biology Institute, University of California, Los Angeles, Los Angeles, California, USA
| | - Thomas A. Zangle
- Department of Chemical Engineering and Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah, USA
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27
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Jocic S, Mestres G, Tenje M. Fabrication of user-friendly and biomimetic 1,1′-carbonyldiimidazole cross-linked gelatin/agar microfluidic devices. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:1175-1180. [DOI: 10.1016/j.msec.2017.03.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 03/03/2017] [Indexed: 01/03/2023]
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28
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Milczek EM. Commercial Applications for Enzyme-Mediated Protein Conjugation: New Developments in Enzymatic Processes to Deliver Functionalized Proteins on the Commercial Scale. Chem Rev 2017. [DOI: 10.1021/acs.chemrev.6b00832] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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29
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Lee SH, Shim KY, Kim B, Sung JH. Hydrogel-based three-dimensional cell culture for organ-on-a-chip applications. Biotechnol Prog 2017; 33:580-589. [PMID: 28247962 DOI: 10.1002/btpr.2457] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 11/23/2016] [Indexed: 12/29/2022]
Abstract
Recent studies have reported that three-dimensionally cultured cells have more physiologically relevant functions than two-dimensionally cultured cells. Cells are three-dimensionally surrounded by the extracellular matrix (ECM) in complex in vivo microenvironments and interact with the ECM and neighboring cells. Therefore, replicating the ECM environment is key to the successful cell culture models. Various natural and synthetic hydrogels have been used to mimic ECM environments based on their physical, chemical, and biological characteristics, such as biocompatibility, biodegradability, and biochemical functional groups. Because of these characteristics, hydrogels have been combined with microtechnologies and used in organ-on-a-chip applications to more closely recapitulate the in vivo microenvironment. Therefore, appropriate hydrogels should be selected depending on the cell types and applications. The porosity of the selected hydrogel should be controlled to facilitate the movement of nutrients and oxygen. In this review, we describe various types of hydrogels, external stimulation-based gelation of hydrogels, and control of their porosity. Then, we introduce applications of hydrogels for organ-on-a-chip. Last, we also discuss the challenges of hydrogel-based three-dimensional cell culture techniques and propose future directions. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:580-589, 2017.
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Affiliation(s)
- Seung Hwan Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-742, Republic of Korea
| | - Kyu Young Shim
- Chemical Engineering, Hongik University, Seoul, 121-791, Republic of Korea
| | - Bumsang Kim
- Chemical Engineering, Hongik University, Seoul, 121-791, Republic of Korea
| | - Jong Hwan Sung
- Chemical Engineering, Hongik University, Seoul, 121-791, Republic of Korea
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30
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Shin DS, Tokuda EY, Leight JL, Miksch CE, Brown TE, Anseth KS. Synthesis of microgel sensors for spatial and temporal monitoring of protease activity. ACS Biomater Sci Eng 2017; 4:378-387. [PMID: 29527570 PMCID: PMC5842818 DOI: 10.1021/acsbiomaterials.7b00017] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Proteases are involved in almost every important cellular activity, from embryonic morphogenesis to apoptosis. To study protease activity in situ, hydrogels provide a synthetic mimic of the extracellular matrix (ECM) and have utility as a platform to study activity, such as those related to cell migration, in three-dimensions. While 3-dimensional visualization of protease activity could prove quite useful to elucidate the proteolytic interaction at the interface between cells and their surrounding environment, there has been no versatile tool to visualize local proteolytic activity in real time. Here, micron-sized gels were synthesized by inverse suspension polymerization using thiolene photo-click chemistry. The size distribution was selected to avoid cellular uptake and to lower cytotoxicity, while simultaneously allowing the integration of peptide-based FRET sensors of local cell activity. Proteolytic activity of collagenase was detected within an hour via changes in fluorescence of embedded microgels; incubation of microgel sensors with A375 melanoma cells showed upregulated MMP activity in the presence of soluble fibronectins in media. The microgel sensors were readily incorporated into both gelatin and poly(ethylene glycol) (PEG) hydrogels and used to successfully detect spatiotemporal proteolytic activity of A375 melanoma cells. Finally, a tumor model was constructed from a hydrogel microwell array that was used to aggregate A375 melanoma cells, and local variations in proteolytic activity were monitored as a function of distance from the cell aggregate center.
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Affiliation(s)
- Della S. Shin
- Department of Chemical and Biological Engineering, University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, CO 80309, USA
| | - Emi Y. Tokuda
- Suite 100, Ben Towne Center for Childhood Cancer Research, Seattle Children’s Research Institute, 1100 Olive Way, Seattle, WA 98101, USA
| | - Jennifer L. Leight
- Department of Biomedical Engineering, Ohio State University, 1080 Carmack Rd., Columbus, OH 43210, USA
| | - Connor E. Miksch
- Department of Chemical and Biological Engineering, University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, CO 80309, USA
| | - Tobin E. Brown
- Department of Chemical and Biological Engineering, University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, CO 80309, USA
| | - Kristi S. Anseth
- Department of Chemical and Biological Engineering, University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, CO 80309, USA
- Howard Hughes Medical Institute and the BioFrontiers Institute, University of Colorado at Boulder, 3415 Colorado Avenue, Boulder, CO 80309, USA
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Zakikhan K, Pournasr B, Vosough M, Nassiri-Asl M. In Vitro Generated Hepatocyte-Like Cells: A Novel Tool in Regenerative Medicine and Drug Discovery. CELL JOURNAL 2017; 19:204-217. [PMID: 28670513 PMCID: PMC5412779 DOI: 10.22074/cellj.2016.4362] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 09/05/2016] [Indexed: 12/19/2022]
Abstract
Hepatocyte-like cells (HLCs) are generated from either various human pluripotent stem
cells (hPSCs) including induced pluripotent stem cells (iPSCs) and embryonic stem cells
(ESCs), or direct cell conversion, mesenchymal stem cells as well as other stem cells like
gestational tissues. They provide potential cell sources for biomedical applications. Liver
transplantation is the gold standard treatment for the patients with end stage liver disease,
but there are many obstacles limiting this process, like insufficient number of donated
healthy livers. Meanwhile, the number of patients receiving a liver organ transplant for
a better life is increasing. In this regard, HLCs may provide an adequate cell source to
overcome these shortages. New molecular engineering approaches such as CRISPR/
Cas system applying in iPSCs technology provide the basic principles of gene correction
for monogenic inherited metabolic liver diseases, as another application of HLCs. It has
been shown that HLCs could replace primary human hepatocytes in drug discovery and
hepatotoxicity tests. However, generation of fully functional HLCs is still a big challenge;
several research groups have been trying to improve current differentiation protocols to
achieve better HLCs according to morphology and function of cells. Large-scale generation
of functional HLCs in bioreactors could make a new opportunity in producing enough
hepatocytes for treating end-stage liver patients as well as other biomedical applications
such as drug studies. In this review, regarding the biomedical value of HLCs, we focus
on the current and efficient approaches for generating hepatocyte-like cells in vitro and
discuss about their applications in regenerative medicine and drug discovery.
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Affiliation(s)
- Kobra Zakikhan
- Cellular and Molecular Research Center, Department of Molecular Medicine, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Behshad Pournasr
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Massoud Vosough
- Department of Regenerative Biomedicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Marjan Nassiri-Asl
- Cellular and Molecular Research Center, Department of Molecular Medicine, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran.,Cellular and Molecular Research Center, Department of Pharmacology, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
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Limongi T, Tirinato L, Pagliari F, Giugni A, Allione M, Perozziello G, Candeloro P, Di Fabrizio E. Fabrication and Applications of Micro/Nanostructured Devices for Tissue Engineering. NANO-MICRO LETTERS 2017; 9:1. [PMID: 30460298 PMCID: PMC6223775 DOI: 10.1007/s40820-016-0103-7] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 07/28/2016] [Indexed: 05/17/2023]
Abstract
Nanotechnology allows the realization of new materials and devices with basic structural unit in the range of 1-100 nm and characterized by gaining control at the atomic, molecular, and supramolecular level. Reducing the dimensions of a material into the nanoscale range usually results in the change of its physiochemical properties such as reactivity, crystallinity, and solubility. This review treats the convergence of last research news at the interface of nanostructured biomaterials and tissue engineering for emerging biomedical technologies such as scaffolding and tissue regeneration. The present review is organized into three main sections. The introduction concerns an overview of the increasing utility of nanostructured materials in the field of tissue engineering. It elucidates how nanotechnology, by working in the submicron length scale, assures the realization of a biocompatible interface that is able to reproduce the physiological cell-matrix interaction. The second, more technical section, concerns the design and fabrication of biocompatible surface characterized by micro- and submicroscale features, using microfabrication, nanolithography, and miscellaneous nanolithographic techniques. In the last part, we review the ongoing tissue engineering application of nanostructured materials and scaffolds in different fields such as neurology, cardiology, orthopedics, and skin tissue regeneration.
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Affiliation(s)
- Tania Limongi
- SMILEs Lab, Physical Science and Engineering (PSE) and Biological and Environmental Sciences and Engineering (BESE) Divisions, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
| | - Luca Tirinato
- SMILEs Lab, Physical Science and Engineering (PSE) and Biological and Environmental Sciences and Engineering (BESE) Divisions, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
| | - Francesca Pagliari
- Department of Biological and Environmental Sciences and Engineering (BESE), King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
| | - Andrea Giugni
- SMILEs Lab, Physical Science and Engineering (PSE) and Biological and Environmental Sciences and Engineering (BESE) Divisions, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
| | - Marco Allione
- SMILEs Lab, Physical Science and Engineering (PSE) and Biological and Environmental Sciences and Engineering (BESE) Divisions, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
| | - Gerardo Perozziello
- Laboratory of Nanotechnology BioNEM, Department of Experimental and Clinical Medicine, University “Magna Graecia” of Catanzaro, Viale Europa - Loc. Germaneto, 88100 Catanzaro, Italy
| | - Patrizio Candeloro
- Laboratory of Nanotechnology BioNEM, Department of Experimental and Clinical Medicine, University “Magna Graecia” of Catanzaro, Viale Europa - Loc. Germaneto, 88100 Catanzaro, Italy
| | - Enzo Di Fabrizio
- SMILEs Lab, Physical Science and Engineering (PSE) and Biological and Environmental Sciences and Engineering (BESE) Divisions, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
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Heparin-gelatin mixture improves vascular reconstruction efficiency and hepatic function in bioengineered livers. Acta Biomater 2016; 38:82-93. [PMID: 27134015 DOI: 10.1016/j.actbio.2016.04.042] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 04/19/2016] [Accepted: 04/27/2016] [Indexed: 12/11/2022]
Abstract
UNLABELLED Whole organ decellularization is a cell removal process that creates a natural extracellular matrix for use in transplantation. A lack of an intact endothelial layer in the vascular network of decellularized organs results in blood clotting even with anti-coagulation treatment. Furthermore, shear stress caused by blood flow may affect reseeded parenchymal cells. We hypothesized that a heparin-gelatin mixture (HG) can act as an antithrombotic coating reagent and induce attachment and migration of endothelial cells (ECs) on vascular wall surfaces within decellularized livers, with subsequent parenchymal cell function enhancement. Portal vein (PV) perfusion was performed for right lateral lobe decellularization of porcine livers. We tested if HG-precoating of isolated decellularized PV could increase EC attachment and migration. Additionally, we coated PV and hepatic artery walls in decellularized liver with HG, and then repopulated it with ECs and maintained it under vascular flow in a bioreactor for 10days. Re-endothelialized scaffolds were perfused with porcine blood for thrombogenicity evaluation. We then co-cultured hepatocellular carcinoma (HepG2) cells and ECs to evaluate the effect of endothelialization on parenchymal cells. Finally, we transplanted these scaffolds heterotopically in pigs. HG improved ECs' ability to migrate and adhere to vessel discs. ECs efficiently covered the vascular compartments within decellularized scaffolds and maintained function and proliferation after HG-precoating. No thrombosis was observed after 24h blood perfusion in HG-precoated scaffolds, indicating an efficiently endothelialized vascular tree. HepG2 cells displayed a higher function in scaffolds endothelialized after HG-precoating compared to uncoated scaffolds in vitro and after in vivo transplantation. Our results lay the groundwork for engineering human-sized whole-liver scaffolds for clinical applications. STATEMENT OF SIGNIFICANCE A major obstacle to successful organ bioengineering is vasculature reconstruction to avoid thrombosis and deliver nutrients through blood to the whole scaffold after in vivo transplantation. Although many attempts have been made to construct endothelial cell layers on the vascular network within decellularized organs, complete coverage has not be achieved. Here, we describe an effective approach for endothelial cell seeding to reconstruct a patent vascular tree within decellularized livers by coating the vasculature using heparin-gelatin mixture. Our results have demonstrate that enhancement of endothelial cell attachment by heparin-gelatin treatment could improve vascular patency and parenchymal cell function in vitro and in vivo. These results represent a significant advancement toward bioengineering functional liver tissue that maintains vascular patency for transplantation.
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Abstract
The current state of screening methods for drug discovery is still riddled with several inefficiencies. Although some widely used high-throughput screening platforms may enhance the drug screening process, their cost and oversimplification of cell-drug interactions pose a translational difficulty. Microfluidic cell-chips resolve many issues found in conventional HTS technology, providing benefits such as reduced sample quantity and integration of 3D cell culture physically more representative of the physiological/pathological microenvironment. In this review, we introduce the advantages of microfluidic devices in drug screening, and outline the critical factors which influence device design, highlighting recent innovations and advances in the field including a summary of commercialization efforts on microfluidic cell chips. Future perspectives of microfluidic cell devices are also provided based on considerations of present technological limitations and translational barriers.
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35
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Mun CH, Hwang JY, Lee SH. Microfluidic spinning of the fibrous alginate scaffolds for modulation of the degradation profile. Tissue Eng Regen Med 2016; 13:140-148. [PMID: 30603393 DOI: 10.1007/s13770-016-9048-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 07/26/2015] [Accepted: 07/28/2015] [Indexed: 01/09/2023] Open
Abstract
In tissue engineering, alginate has been an attractive material due to its biocompatibility and ability to form hydrogels, unless its uncontrollable degradation could be an undesirable feature. Here, we developed a simple and easy method to tune the degradation profile of the fibrous alginate scaffolds by the microfluidic wet spinning techniques, according with the use of isopropyl alcohol for dense packing of alginate chains in the microfiber production and the increase of crosslinking with Ca2+ ion. The degradation profiling was analyzed by mass losses, swelling ratios, and also observation of the morphologic changes. The results demonstrated that high packing density might be provided by self-aggregation of polymer chains through high dipole interactions between sheath and core fluids and that the increase of crosslinking rates could make degradation of alginate scaffold controllable. We suggest that the tunable degradation of the alginate fibrous scaffolds may expand its utilities for biomedical applications such as drug delivery, in vitro cell culture, wound healing, tissue engineering and regenerative medicine. Electronic Supplementary Material Supplementary material is available for this article at 10.1007/s13770-016-9048-7 and is accessible for authorized users.
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Affiliation(s)
- Cho Hay Mun
- 1Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, Korea
| | - Ji-Young Hwang
- 1Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, Korea
| | - Sang-Hoon Lee
- 1Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, Korea.,2Department of Bio-convergence Engineering, College of Health Science, Korea University, Seoul, Korea.,3KU-KIST Graduate School of Converging Sciences & Technology, Korea University, Seoul, Korea
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36
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Zhao S, Chen Y, Partlow BP, Golding AS, Tseng P, Coburn J, Applegate MB, Moreau JE, Omenetto FG, Kaplan DL. Bio-functionalized silk hydrogel microfluidic systems. Biomaterials 2016; 93:60-70. [PMID: 27077566 DOI: 10.1016/j.biomaterials.2016.03.041] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 03/05/2016] [Accepted: 03/28/2016] [Indexed: 12/16/2022]
Abstract
Bio-functionalized microfluidic systems were developed based on a silk protein hydrogel elastomeric materials. A facile multilayer fabrication method using gelatin sacrificial molding and layer-by-layer assembly was implemented to construct interconnected, three dimensional (3D) microchannel networks in silk hydrogels at 100 μm minimum feature resolution. Mechanically activated valves were implemented to demonstrate pneumatic control of microflow. The silk hydrogel microfluidics exhibit controllable mechanical properties, long-term stability in various environmental conditions, tunable in vitro and in vivo degradability in addition to optical transparency, providing unique features for cell/tissue-related applications than conventional polydimethylsiloxane (PDMS) and existing hydrogel-based microfluidic options. As demonstrated in the work here, the all aqueous-based fabrication process at ambient conditions enabled the incorporation of active biological substances in the bulk phase of these new silk microfluidic systems during device fabrication, including enzymes and living cells, which are able to interact with the fluid flow in the microchannels. These silk hydrogel-based microfluidic systems offer new opportunities in engineering active diagnostic devices, tissues and organs that could be integrated in vivo, and for on-chip cell sensing systems.
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Affiliation(s)
- Siwei Zhao
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Ying Chen
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Benjamin P Partlow
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Anne S Golding
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Peter Tseng
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Jeannine Coburn
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Matthew B Applegate
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Jodie E Moreau
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Fiorenzo G Omenetto
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA.
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37
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Wisotzki EI, Friedrich RP, Weidt A, Alexiou C, Mayr SG, Zink M. Cellular Response to Reagent-Free Electron-Irradiated Gelatin Hydrogels. Macromol Biosci 2016; 16:914-24. [DOI: 10.1002/mabi.201500408] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 01/29/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Emilia I. Wisotzki
- Leibniz Institute of Surface Modification (IOM); Permoserstrasse 15 04318 Leipzig Germany
- Faculty of Physics and Earth Sciences; Leipzig University; Linnéstrasse 5 04103 Leipzig Germany
| | - Ralf P. Friedrich
- ENT Clinic; Section of Experimental Oncology and Nanomedicine (SEON); Else Kröner-Fresenius-Stiftung Professorship; University Hospital Erlangen; Erlangen Germany
| | - Astrid Weidt
- Faculty of Physics and Earth Sciences; Leipzig University; Linnéstrasse 5 04103 Leipzig Germany
| | - Christoph Alexiou
- ENT Clinic; Section of Experimental Oncology and Nanomedicine (SEON); Else Kröner-Fresenius-Stiftung Professorship; University Hospital Erlangen; Erlangen Germany
| | - Stefan G. Mayr
- Leibniz Institute of Surface Modification (IOM); Permoserstrasse 15 04318 Leipzig Germany
- Faculty of Physics and Earth Sciences; Leipzig University; Linnéstrasse 5 04103 Leipzig Germany
| | - Mareike Zink
- Faculty of Physics and Earth Sciences; Leipzig University; Linnéstrasse 5 04103 Leipzig Germany
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Asghari F, Samiei M, Adibkia K, Akbarzadeh A, Davaran S. Biodegradable and biocompatible polymers for tissue engineering application: a review. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2016; 45:185-192. [DOI: 10.3109/21691401.2016.1146731] [Citation(s) in RCA: 261] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Fatemeh Asghari
- Department of Medical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Endododntics, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Samiei
- Department of Medical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Endododntics, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Khosro Adibkia
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abolfazl Akbarzadeh
- Department of Medical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Soodabeh Davaran
- Department of Medical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Fabrication of circular microfluidic network in enzymatically-crosslinked gelatin hydrogel. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 59:53-60. [DOI: 10.1016/j.msec.2015.09.104] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 09/07/2015] [Accepted: 09/29/2015] [Indexed: 12/31/2022]
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40
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Affiliation(s)
- Alexander K. Price
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL 33458, United States
| | - Brian M. Paegel
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL 33458, United States
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41
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Liu J, Zheng H, Poh PSP, Machens HG, Schilling AF. Hydrogels for Engineering of Perfusable Vascular Networks. Int J Mol Sci 2015; 16:15997-6016. [PMID: 26184185 PMCID: PMC4519935 DOI: 10.3390/ijms160715997] [Citation(s) in RCA: 162] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/09/2015] [Accepted: 07/07/2015] [Indexed: 02/03/2023] Open
Abstract
Hydrogels are commonly used biomaterials for tissue engineering. With their high-water content, good biocompatibility and biodegradability they resemble the natural extracellular environment and have been widely used as scaffolds for 3D cell culture and studies of cell biology. The possible size of such hydrogel constructs with embedded cells is limited by the cellular demand for oxygen and nutrients. For the fabrication of large and complex tissue constructs, vascular structures become necessary within the hydrogels to supply the encapsulated cells. In this review, we discuss the types of hydrogels that are currently used for the fabrication of constructs with embedded vascular networks, the key properties of hydrogels needed for this purpose and current techniques to engineer perfusable vascular structures into these hydrogels. We then discuss directions for future research aimed at engineering of vascularized tissue for implantation.
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Affiliation(s)
- Juan Liu
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technische Universität München, D-81675 Munich, Germany.
- Department of Hand Surgery, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
| | - Huaiyuan Zheng
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technische Universität München, D-81675 Munich, Germany.
- Department of Hand Surgery, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
| | - Patrina S P Poh
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technische Universität München, D-81675 Munich, Germany.
| | - Hans-Günther Machens
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technische Universität München, D-81675 Munich, Germany.
| | - Arndt F Schilling
- Department of Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technische Universität München, D-81675 Munich, Germany.
- Center for Applied Tissue Engineering and Regenerative Medicine (CANTER), Munich University of Applied Science, D-80335 Munich, Germany.
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42
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Bhatnagar D, Bherwani AK, Simon M, Rafailovich MH. Biomineralization on enzymatically cross-linked gelatin hydrogels in the absence of dexamethasone. J Mater Chem B 2015; 3:5210-5219. [PMID: 32262596 DOI: 10.1039/c5tb00482a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A mechanical stimulus and chemical induction by dexamethasone have been important factors in dental pulp stem cell (DPSC) differentiation and biomineralization. We have demonstrated that the enzymatically crosslinked gelatin hydrogels are extremely effective substrates for DPSC differentiation towards odontoblasts. DPSCs were seeded on the crosslinked hard (∼8 kPa) and soft (∼0.15 kPa) gelatin hydrogels for 35 days with and without dexamethasone. Odontogenic differentiation markers such as OCN, ALP and DSPP were upregulated after 35 days of culture on crosslinked hydrogels with and without dexamethasone. SEM and Alizarin red staining of the crosslinked hydrogels showed a biomineralized sheet of hydroxyapatite deposits laid by the DPSCs on the top surface and inside the hydrogel. We found that the DPSC differentiation and biomineralization were independent of the hydrogel stiffness and dexamethasone. We hypothesize that this biomineralization was indeed triggered by the surface chemistry of the crosslinked gelatin hydrogels since we did not observe any biomineralization on the uncrosslinked gelatin or mTG. We also showed that the DPSCs, when removed from hard hydrogel surfaces and re-seeded on a TCPS, retained their odontogenic lineage and showed a permanent mineralization effect. Our results show the potential of enzymatically crosslinked gelatin hydrogels as scaffolds for dentin regeneration.
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Affiliation(s)
- Divya Bhatnagar
- Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY 11790, USA.
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Suhaeri M, Subbiah R, Van SY, Du P, Kim IG, Lee K, Park K. Cardiomyoblast (h9c2) differentiation on tunable extracellular matrix microenvironment. Tissue Eng Part A 2015; 21:1940-51. [PMID: 25836924 DOI: 10.1089/ten.tea.2014.0591] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Extracellular matrices (ECM) obtained from in vitro-cultured cells have been given much attention, but its application in cardiac tissue engineering is still limited. This study investigates cardiomyogenic potential of fibroblast-derived matrix (FDM) as a novel ECM platform over gelatin or fibronectin, in generating cardiac cell lineages derived from H9c2 cardiomyoblasts. As characterized through SEM and AFM, FDM exhibits unique surface texture and biomechanical property. Immunofluorescence also found fibronectin, collagen, and laminin in the FDM. Cells on FDM showed a more circular shape and slightly less proliferation in a growth medium. After being cultured in a differentiation medium for 7 days, H9c2 cells on FDM differentiated into cardiomyocytes, as identified by stronger positive markers, such as α-actinin and cTnT, along with more elevated gene expression of Myl2 and Tnnt compared to the cells on gelatin and fibronectin. The gap junction protein connexin 43 was also significantly upregulated for the cells differentiated on FDM. A successive work enabled matrix stiffness tunable; FDM crosslinked by 2wt% genipin increased the stiffness up to 8.5 kPa, 100 times harder than that of natural FDM. The gene expression of integrin subunit α5 was significantly more upregulated on FDM than on crosslinked FDM (X-FDM), whereas no difference was observed for β1 expression. Interestingly, X-FDM showed a much greater effect on the cardiomyoblast differentiation into cardiomyocytes over natural one. This study strongly indicates that FDM can be a favorable ECM microenvironment for cardiomyogenesis of H9c2 and that tunable mechanical compliance induced by crosslinking further provides a valuable insight into the role of matrix stiffness on cardiomyogenesis.
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Affiliation(s)
- Muhammad Suhaeri
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea.,2Department of Biomedical Engineering, University of Science and Technology, Daejon, Republic of Korea
| | - Ramesh Subbiah
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea.,2Department of Biomedical Engineering, University of Science and Technology, Daejon, Republic of Korea
| | - Se Young Van
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea.,2Department of Biomedical Engineering, University of Science and Technology, Daejon, Republic of Korea
| | - Ping Du
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea.,2Department of Biomedical Engineering, University of Science and Technology, Daejon, Republic of Korea
| | - In Gul Kim
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Kangwon Lee
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea.,2Department of Biomedical Engineering, University of Science and Technology, Daejon, Republic of Korea
| | - Kwideok Park
- 1Center for Biomaterials, Korea Institute of Science and Technology, Seoul, Republic of Korea.,2Department of Biomedical Engineering, University of Science and Technology, Daejon, Republic of Korea
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44
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EXP CLIN TRANSPLANTExp Clin Transplant 2015; 13. [DOI: 10.6002/ect.mesot2014.p215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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45
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Sonney S, Shek N, Moran-Mirabal JM. Rapid bench-top fabrication of poly(dimethylsiloxane)/polystyrene microfluidic devices incorporating high-surface-area sensing electrodes. BIOMICROFLUIDICS 2015; 9:026501. [PMID: 25945145 PMCID: PMC4401806 DOI: 10.1063/1.4918596] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 04/07/2015] [Indexed: 06/04/2023]
Abstract
The development of widely applicable point-of-care sensing and diagnostic devices can benefit from simple and inexpensive fabrication techniques that expedite the design, testing, and implementation of lab-on-a-chip devices. In particular, electrodes integrated within microfluidic devices enable the use of electrochemical techniques for the label-free detection of relevant analytes. This work presents a novel, simple, and cost-effective bench-top approach for the integration of high surface area three-dimensional structured electrodes fabricated on polystyrene (PS) within poly(dimethylsiloxane) (PDMS)-based microfluidics. Optimization of PS-PDMS bonding results in integrated devices that perform well under pressure and fluidic flow stress. Furthermore, the fabrication and bonding processes are shown to have no effect on sensing electrode performance. Finally, the on-chip sensing capabilities of a three-electrode electrochemical cell are demonstrated with a model redox compound, where the high surface area structured electrodes exhibit ultra-high sensitivity. We propose that the developed approach can significantly expedite and reduce the cost of fabrication of sensing devices where arrays of functionalized electrodes can be used for point-of-care analysis and diagnostics.
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Affiliation(s)
- Sanjay Sonney
- Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada
| | - Norman Shek
- Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada
| | - Jose M Moran-Mirabal
- Department of Chemistry and Chemical Biology, McMaster University , Hamilton, Ontario L8S 4M1, Canada
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Han YL, Xu Q, Lu ZQ, Wang JY. Preparation of transparent zein films for cell culture applications. Colloids Surf B Biointerfaces 2014; 120:55-62. [DOI: 10.1016/j.colsurfb.2014.04.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 04/01/2014] [Accepted: 04/16/2014] [Indexed: 10/25/2022]
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Hamid Q, Wang C, Snyder J, Sun W. Surface modification of SU-8 for enhanced cell attachment and proliferation within microfluidic chips. J Biomed Mater Res B Appl Biomater 2014; 103:473-84. [PMID: 24919697 DOI: 10.1002/jbm.b.33223] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 05/09/2014] [Accepted: 05/17/2014] [Indexed: 11/06/2022]
Abstract
Advances in micro-electro-mechanical systems (MEMS) have led to an increased fabrication of micro-channels. Microfabrication techniques are utilized to develop microfluidic channels for continuous nutrition supply to cells inside a micro-environment. The ability of cells to build tissues and maintain tissue-specific functions depends on the interaction between cells and the extracellular matrix (ECM). SU-8 is a popular photosensitive epoxy-based polymer in MEMS. The patterning of bare SU-8 alone does not provide the appropriate ECM necessary to develop microsystems for biological applications. Manipulating the chemical composition of SU-8 will enhance the biological compatibility, giving the fabricated constructs the appropriate ECM needed to promote a functional tissue array. This article investigates three frequently used surface treatment techniques: (1) plasma treatment, (2) chemical reaction, and (3) deposition treatment to determine which surface treatment is the most beneficial for enhancing the biological properties of SU-8. The investigations presented in this article demonstrated that the plasma, gelatin, and sulfuric acid treatments have a potential to enhance SU-8's surface for biological application. Of course each treatment has their advantages and disadvantages (application dependent). Cell proliferation was studied with the use of the dye Almar Blue, and a micro-plate reader. After 14 days, cell proliferation to plasma treated surfaces was statistically significantly enhanced (p < 0.00001), compared to untreated surfaces. The plasma treated surface is suggested to be the better of the three treatments for biological enhancement followed by gelatin and sulfuric acid treatments, respectively.
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Affiliation(s)
- Qudus Hamid
- Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania
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Zhao Y, Yao R, Ouyang L, Ding H, Zhang T, Zhang K, Cheng S, Sun W. Three-dimensional printing of Hela cells for cervical tumor model in vitro. Biofabrication 2014; 6:035001. [PMID: 24722236 DOI: 10.1088/1758-5082/6/3/035001] [Citation(s) in RCA: 293] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Advances in three-dimensional (3D) printing have enabled the direct assembly of cells and extracellular matrix materials to form in vitro cellular models for 3D biology, the study of disease pathogenesis and new drug discovery. In this study, we report a method of 3D printing for Hela cells and gelatin/alginate/fibrinogen hydrogels to construct in vitro cervical tumor models. Cell proliferation, matrix metalloproteinase (MMP) protein expression and chemoresistance were measured in the printed 3D cervical tumor models and compared with conventional 2D planar culture models. Over 90% cell viability was observed using the defined printing process. Comparisons of 3D and 2D results revealed that Hela cells showed a higher proliferation rate in the printed 3D environment and tended to form cellular spheroids, but formed monolayer cell sheets in 2D culture. Hela cells in 3D printed models also showed higher MMP protein expression and higher chemoresistance than those in 2D culture. These new biological characteristics from the printed 3D tumor models in vitro as well as the novel 3D cell printing technology may help the evolution of 3D cancer study.
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Affiliation(s)
- Yu Zhao
- Department of Mechanical Engineering, Biomanufacturing Center, Tsinghua University, Beijing, People's Republic of China. Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing, People's Republic of China
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Barua S, Mitragotri S. Challenges associated with Penetration of Nanoparticles across Cell and Tissue Barriers: A Review of Current Status and Future Prospects. NANO TODAY 2014; 9:223-243. [PMID: 25132862 PMCID: PMC4129396 DOI: 10.1016/j.nantod.2014.04.008] [Citation(s) in RCA: 703] [Impact Index Per Article: 70.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Nanoparticles (NPs) have emerged as an effective modality for the treatment of various diseases including cancer, cardiovascular and inflammatory diseases. Various forms of NPs including liposomes, polymer particles, micelles, dendrimers, quantum dots, gold NPs and carbon nanotubes have been synthesized and tested for therapeutic applications. One of the greatest challenges that limit the success of NPs is their ability to reach the therapeutic site at necessary doses while minimizing accumulation at undesired sites. The biodistribution of NPs is determined by body's biological barriers that manifest in several distinct ways. For intravascular delivery of NPs, the barrier manifests in the form of: (i) immune clearance in the liver and spleen, (ii) permeation across the endothelium into target tissues, (iii) penetration through the tissue interstitium, (iv) endocytosis in target cells, (v) diffusion through cytoplasm and (vi) eventually entry into the nucleus, if required. Certain applications of NPs also rely on delivery through alternate routes including skin and mucosal membranes of the nose, lungs, intestine and vagina. In these cases, the diffusive resistance of these tissues poses a significant barrier to delivery. This review focuses on the current understanding of penetration of NPs through biological barriers. Emphasis is placed on transport barriers and not immunological barriers. The review also discusses design strategies for overcoming the barrier properties.
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Affiliation(s)
- Sutapa Barua
- Center for Bioengineering, Department of Chemical Engineering University of California, Santa Barbara, CA 93106
| | - Samir Mitragotri
- Center for Bioengineering, Department of Chemical Engineering University of California, Santa Barbara, CA 93106
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Cosson S, Lutolf MP. Hydrogel microfluidics for the patterning of pluripotent stem cells. Sci Rep 2014; 4:4462. [PMID: 24662945 PMCID: PMC3964519 DOI: 10.1038/srep04462] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 03/10/2014] [Indexed: 01/09/2023] Open
Abstract
Biomolecular signaling is of utmost importance in governing many biological processes such as the patterning of the developing embryo where biomolecules regulate key cell-fate decisions. In vivo, these factors are presented in a spatiotemporally tightly controlled fashion. Although state-of-the-art microfluidic technologies allow precise biomolecule delivery in time and space, long-term (stem) cell culture at the micro-scale is often far from ideal due to medium evaporation, limited space for cell growth or shear stress. To overcome these challenges, we here introduce a concept based on hydrogel microfluidics for decoupling conventional, macro-scale cell culture from precise biomolecule delivery through a gel layer. We demonstrate the spatiotemporally controlled neuronal commitment of mouse embryonic stem cells via delivery of retinoic acid gradients. This technique should be useful for testing the effect of dose and timing of biomolecules, singly or in combination, on stem cell fate.
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Affiliation(s)
- S Cosson
- School of Life Sciences, Institute of Bioengineering and Laboratory of Stem Cell Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - M P Lutolf
- School of Life Sciences, Institute of Bioengineering and Laboratory of Stem Cell Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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