1
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Kim NY, Choi YY, Kim TH, Ha JH, Kim TH, Kang T, Chung BG. Synergistic Effect of Electrical and Biochemical Stimulation on Human iPSC-Derived Neural Differentiation in a Microfluidic Electrode Array Chip. ACS Appl Mater Interfaces 2024; 16:15730-15740. [PMID: 38527279 DOI: 10.1021/acsami.3c17108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Neural differentiation is crucial for advancing our understanding of the nervous system and developing treatments for neurological disorders. The advanced methods and the ability to manipulate the alignment, proliferation, and differentiation of stem cells are essential for studying neuronal development and synaptic interactions. However, the utilization of human induced pluripotent stem cells (iPSCs) for disease modeling of neurodegenerative conditions may be constrained by the prolonged duration and uncontrolled cell differentiation required for functional neural cell differentiation. Here, we developed a microfluidic chip to enhance the differentiation and maturation of specific neural lineages by placing aligned microelectrodes on the glass surface to regulate the neural differentiation of human iPSCs. The utilization of electrical stimulation (ES) in conjunction with neurotrophic factors (NF) significantly enhanced the efficiency in generating functional neurons from human iPSCs. We also observed that the simultaneous application of NF and ES to human iPSCs promoted their differentiation and maturation into functional neurons while increasing synaptic interactions. Our research demonstrated the effect of combining NF and ES on human iPSC-derived neural differentiation.
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Affiliation(s)
- Na Yeon Kim
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea
| | - Yoon Young Choi
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
| | - Tae Hyeon Kim
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea
| | - Taewook Kang
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 04107, Korea
| | - Bong Geun Chung
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
- Institute of Smart Biosensor, Sogang University, Seoul 04107, Korea
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2
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Kim NY, Lee HY, Choi YY, Mo SJ, Jeon S, Ha JH, Park SD, Shim JJ, Lee J, Chung BG. Effect of gut microbiota-derived metabolites and extracellular vesicles on neurodegenerative disease in a gut-brain axis chip. Nano Converg 2024; 11:7. [PMID: 38340254 DOI: 10.1186/s40580-024-00413-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/21/2024] [Indexed: 02/12/2024]
Abstract
A new perspective suggests that a dynamic bidirectional communication system, often referred to as the microbiome-gut-brain axis, exists among the gut, its microbiome, and the central nervous system (CNS). This system may influence brain health and various brain-related diseases, especially in the realms of neurodevelopmental and neurodegenerative conditions. However, the exact mechanism is not yet understood. Metabolites or extracellular vesicles derived from microbes in the gut have the capacity to traverse the intestinal epithelial barrier or blood-brain barrier, gaining access to the systemic circulation. This phenomenon can initiate the physiological responses that directly or indirectly impact the CNS and its function. However, reliable and controllable tools are required to demonstrate the causal effects of gut microbial-derived substances on neurogenesis and neurodegenerative diseases. The integration of microfluidics enhances scientific research by providing advanced in vitro engineering models. In this study, we investigated the impact of microbe-derived metabolites and exosomes on neurodevelopment and neurodegenerative disorders using human induced pluripotent stem cells (iPSCs)-derived neurons in a gut-brain axis chip. While strain-specific, our findings indicate that both microbial-derived metabolites and exosomes exert the significant effects on neural growth, maturation, and synaptic plasticity. Therefore, our results suggest that metabolites and exosomes derived from microbes hold promise as potential candidates and strategies for addressing neurodevelopmental and neurodegenerative disorders.
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Affiliation(s)
- Na Yeon Kim
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Ho Yeon Lee
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Yoon Young Choi
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
| | | | | | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | | | | | | | - Bong Geun Chung
- Department of Biomedical Engineering, Sogang University, Seoul, Korea.
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea.
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
- Institute of Smart Biosensor, Sogang University, Seoul, Korea.
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3
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Kim TH, Kim NY, Lee HU, Choi JW, Kang T, Chung BG. Smartphone-based iontophoresis transdermal drug delivery system for cancer treatment. J Control Release 2023; 364:383-392. [PMID: 37914000 DOI: 10.1016/j.jconrel.2023.10.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 10/16/2023] [Accepted: 10/27/2023] [Indexed: 11/03/2023]
Abstract
Cancer is a leading cause of the death worldwide. However, the conventional cancer therapy still suffers from several limitations, such as systemic side effects, poor efficacy, and patient compliance due to limited accessibility to the tumor site. To address these issues, the localized drug delivery system has emerged as a promising approach. In this study, we developed an iontophoresis-based transdermal drug delivery system (TDDS) controlled by a smartphone application for cancer treatment. Iontophoresis, a low-intensity electric current-based TDDS, enhances drug permeation across the skin to provide potential for localized drug delivery and minimize systemic side effects. The fundamental mechanism of our system was modeled using finite element analysis and its performance was corroborated through the flow-through skin permeation tests using a plastic-based microfluidic chip. The results of in vitro cell experiments and skin deposition tests successfully demonstrated that our smartphone-controlled iontophoresis system significantly enhanced the drug permeation for cancer treatment. Therefore, this hand-held smartphone-based iontophoresis TDDS could be a powerful tool for self-administrated anticancer drug delivery applications.
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Affiliation(s)
- Tae Hyeon Kim
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Na Yeon Kim
- Department of Biomedical Engineering, Sogang University, Seoul, Republic of Korea
| | - Hee Uk Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Taewook Kang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Republic of Korea; Institute of Integrated Biotechnology, Sogang University, Seoul, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea; Department of Biomedical Engineering, Sogang University, Seoul, Republic of Korea; Institute of Smart Biosensor, Sogang University, Seoul, Republic of Korea; Institute of Integrated Biotechnology, Sogang University, Seoul, Republic of Korea.
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4
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Ha JH, Lim JH, Lee JM, Chung BG. Electro-Responsive Conductive Blended Hydrogel Patch. Polymers (Basel) 2023; 15:2608. [PMID: 37376253 DOI: 10.3390/polym15122608] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/01/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
The proposed electro-responsive hydrogel has great benefit for transdermal drug delivery system (TDDS) applications. To improve the physical or chemical properties of hydrogels, a number of researchers have previously studied the mixing efficiencies of the blended hydrogels. However, few studies have focused on improving the electrical conductivity and drug delivery of the hydrogels. We developed a conductive blended hydrogel by mixing alginate with gelatin methacrylate (GelMA) and silver nanowire (AgNW). We demonstrated that and the tensile strength of blended hydrogels were increased by a factor of 1.8 by blending GelMA and the electrical conductivity was enhanced by a factor of 18 by the addition of AgNW. Furthermore, the GelMA-alginate-AgNW (Gel-Alg-AgNW) blended hydrogel patch enabled on-off controllable drug release, indicating 57% doxorubicin release in response to electrical stimulation (ES) application. Therefore, this electro-responsive blended hydrogel patch could be useful for smart drug delivery applications.
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Affiliation(s)
- Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Republic of Korea
| | - Jae Hyun Lim
- Research Center, Sogang University, Seoul 04107, Republic of Korea
| | - Jong Min Lee
- Division of Chemical Industry, Yeungnam University College, Daegu 42415, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Republic of Korea
- Institute of Smart Biosensor, Sogang University, Seoul 04107, Republic of Korea
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5
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Choi JW, Seo WH, Kang T, Kang T, Chung BG. Droplet digital recombinase polymerase amplification for multiplexed detection of human coronavirus. Lab Chip 2023; 23:2389-2398. [PMID: 37083004 DOI: 10.1039/d3lc00025g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Since the outbreak of coronavirus 2019 (COVID-19), detection technologies have been attracting a great deal of attention in molecular diagnosis applications. In particular, the droplet digital PCR (ddPCR) has become a promising tool as it offers absolute quantification of target nucleic acids with high specificity and sensitivity. In recent years, the combination of the isothermal amplification strategies has made ddPCR a popular method for on-site testing by enabling amplification at a constant temperature. However, the current isothermal ddPCR assays are still challenging due to inherent non-specific amplification. In this paper, we present a multiplexed droplet digital recombinase polymerase amplification (MddRPA) with precise initiation of the reaction. First, the reaction temperature and dynamic range of reverse transcription (RT) and RPA were characterized by real-time monitoring of fluorescence intensities. Using a droplet-based microfluidic chip, the master mix and the initiator were fractionated and rapidly mixed within well-confined droplets. Due to the high heat transfer and mass transfer of the droplets, the precise initiation of the amplification was enabled and the entire assay could be conducted within 30 min. The concentrations of target RNA in the range from 5 copies per μL to 2500 copies per μL could be detected with high linearity (R2 > 0.999). Furthermore, the multiplexed detection of three types of human coronaviruses was successfully demonstrated with high specificity (>96%). Finally, we compared the performance of the assay with a commercial RT-qPCR system using COVID-19 clinical samples. The MddRPA assay showed a 100% concordance with the RT-qPCR results, indicating its reliability and accuracy in detecting SARS-CoV-2 nucleic acids in clinical samples. Therefore, our MddRPA assay with rapid detection, precise quantification, and multiplexing capability would be an interesting method for molecular diagnosis of viral infections.
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Affiliation(s)
- Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
| | - Won Ho Seo
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Taejoon Kang
- Bionanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, Korea
- School of Pharmacy, Sungkyunkwan University (SKKU), Suwon, Korea
| | - Taewook Kang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Korea
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
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6
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Ratri MC, Suh J, Ryu J, Chung BG, Shin K. Cover Image, Volume 140, Issue 16. J Appl Polym Sci 2023. [DOI: 10.1002/app.53865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
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Ratri MC, Suh J, Ryu J, Chung BG, Shin K. Formulation of three‐dimensional, photo‐responsive printing ink: Gold nanorod‐hydrogel nanocomposites and their four‐dimensional structures that respond quickly to stimuli. J Appl Polym Sci 2023. [DOI: 10.1002/app.53799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Affiliation(s)
- Monica C. Ratri
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul South Korea
- Chemistry Education Study Program Sanata Dharma University Yogyakarta Indonesia
| | - Jungwoo Suh
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul South Korea
| | - Jungju Ryu
- Research Institute for Convergence of Basic Science Hanyang University Seoul South Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering Sogang University Seoul South Korea
| | - Kwanwoo Shin
- Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul South Korea
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8
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Kang SG, Choi YY, Mo SJ, Kim TH, Ha JH, Hong DK, Lee H, Park SD, Shim JJ, Lee JL, Chung BG. Effect of gut microbiome-derived metabolites and extracellular vesicles on hepatocyte functions in a gut-liver axis chip. Nano Converg 2023; 10:5. [PMID: 36645561 PMCID: PMC9842828 DOI: 10.1186/s40580-022-00350-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 12/01/2022] [Indexed: 06/17/2023]
Abstract
Metabolism, is a complex process involving the gut and the liver tissue, is difficult to be reproduced in vitro with conventional single cell culture systems. To tackle this challenge, we developed a gut-liver-axis chip consisting of the gut epithelial cell chamber and three-dimensional (3D) uniform-sized liver spheroid chamber. Two cell culture chamber compartments were separated with a porous membrane to prevent microorganisms from passing through the chamber. When the hepG2 spheroids cultured with microbiota-derived metabolites, we observed the changes in the physiological function of hepG2 spheroids, showing that the albumin and urea secretion activity of liver spheroids was significantly enhanced. Additionally, the functional validation of hepG2 spheroids treated with microbiota-derived exosome was evaluated that the treatment of the microbiota-derived exosome significantly enhanced albumin and urea in hepG2 spheroids in a gut-liver axis chip. Therefore, this gut-liver axis chip could be a potentially powerful co-culture platform to study the interaction of microbiota and host cells.
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Affiliation(s)
- Seong Goo Kang
- Department of Biomedical Engineering, Sogang University, Seoul, 04107, Korea
| | - Yoon Young Choi
- Institute of Integrated Biotechnology, Sogang University, Seoul, 04107, Korea
| | | | - Tae Hyeon Kim
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Korea
| | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Korea
| | | | - Hayera Lee
- R&BD Center, hy Co., Ltd., Yongin-Si, Korea
| | | | | | | | - Bong Geun Chung
- Institute of Integrated Biotechnology, Sogang University, Seoul, 04107, Korea.
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Korea.
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9
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Uk Lee H, Yeon Lee H, Jin JH, Geun Chung B. Three-Dimensional Block Assembled Wireless Rechargeable Supercapacitors. J IND ENG CHEM 2023. [DOI: 10.1016/j.jiec.2023.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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10
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Choi HW, Lim JH, Kang T, Chung BG. Antioxidant, Enzyme, and H 2O 2-Triggered Melanoma Targeted Mesoporous Organo-Silica Nanocomposites for Synergistic Cancer Therapy. Antioxidants (Basel) 2022; 11:2137. [PMID: 36358509 PMCID: PMC9686543 DOI: 10.3390/antiox11112137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 10/22/2022] [Accepted: 10/25/2022] [Indexed: 12/10/2023] Open
Abstract
The multi-stimuli responsive drug delivery system has recently attracted attention in cancer treatments, since it can reduce several side effects and enhance cancer therapeutic efficacy. Herein, we present the intracellular antioxidant (glutathione, GSH), enzyme (hyaluronidase, HAase), and hydrogen peroxide (H2O2) triggered mesoporous organo-silica (MOS) nanocomposites for multi-modal treatments via chemo-, photothermal, and photodynamic cancer therapies. A MOS nanoparticle was synthesized by two-types of precursors, tetraethyl orthosilicate (TEOS) and bis[3-(triethoxysilyl)propyl] tetrasulfide (BTES), providing large-sized mesopores and disulfide bonds cleavable by GSH. Additionally, we introduced a new β-cyclodextrin-hyaluronic acid (CDHA) gatekeeper system, enabling nanocomposites to form the specific interaction with the ferrocene (Fc) molecule, control the drug release by the HAase and H2O2 environment, as well as provide the targeting ability against the CD44-overexpressing melanoma (B16F10) cells. Indocyanine green (ICG) and doxorubicin (Dox) were loaded in the MOS-Fc-CDHA (ID@MOS-Fc-CDHA) nanocomposites, allowing for hyperthermia and cytotoxic reactive oxygen species (ROS) under an 808 nm NIR laser irradiation. Therefore, we demonstrated that the ID@MOS-Fc-CDHA nanocomposites were internalized to the B16F10 cells via the CD44 receptor-mediated endocytosis, showing the controlled drug release by GSH, HAase, and H2O2 to enhance the cancer therapeutic efficacy via the synergistic chemo-, photothermal, and photodynamic therapy effect.
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Affiliation(s)
- Hyung Woo Choi
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea
| | - Taewook Kang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 04107, Korea
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
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Choi JW, Seo WH, Lee YS, Kim SY, Kim BS, Lee KG, Lee SJ, Chung BG. Development of an IoT-integrated multiplexed digital PCR system for quantitative detection of infectious diseases. Lab Chip 2022; 22:3933-3941. [PMID: 36102682 DOI: 10.1039/d2lc00726f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
For rapid detection of the COVID-19 infection, the digital polymerase chain reaction (dPCR) with higher sensitivity and specificity has been presented as a promising method of point-of-care testing (POCT). Unlike the conventional real-time PCR (qPCR), the dPCR system allows absolute quantification of the target DNA without a calibration curve. Although a number of dPCR systems have previously been reported, most of these previous assays lack multiplexing capabilities. As different variants of COVID-19 have rapidly emerged, there is an urgent need for highly specific multiplexed detection systems. Additionally, the advances in the Internet of Things (IoT) technology have enabled the onsite detection of infectious diseases. Here, we present an IoT-integrated multiplexed dPCR (IM-dPCR) system involving sample compartmentalization, DNA amplification, fluorescence imaging, and quantitative analysis. This IM-dPCR system comprises three modules: a plasmonic heating-based thermal cycler, a multi-color fluorescence imaging set-up, and a firmware control module. Combined with a custom-developed smartphone application built on an IoT platform, the IM-dPCR system enabled automatic processing, data collection, and cloud storage. Using a self-priming microfluidic chip, 9 RNA groups (e.g., H1N1, H3N2, IFZ B, DENV2, DENV3, DENV4, OC43, 229E, and NL63) associated with three infectious diseases (e.g., influenza, dengue, and human coronaviruses) were analyzed with higher linearity (>98%) and sensitivity (1 copy per μL). The IM-dPCR system exhibited comparable analytical accuracy to commercial qPCR platforms. Therefore, this IM-dPCR system plays a crucial role in the onsite detection of infectious diseases.
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Affiliation(s)
- Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
| | - Won Ho Seo
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Young Suh Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
| | - So Young Kim
- Biology, Graduate School of Natural Sciences, Soonchunhyang University, Asan, Korea
| | | | - Kyoung G Lee
- Center for Nano Bio Development, National NanoFab Center (NNFC), Daejeon, Korea
| | - Seok Jae Lee
- Center for Nano Bio Development, National NanoFab Center (NNFC), Daejeon, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
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12
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Lee SI, Choi YY, Kang SG, Kim TH, Choi JW, Kim YJ, Kim TH, Kang T, Chung BG. 3D Multicellular Tumor Spheroids in a Microfluidic Droplet System for Investigation of Drug Resistance. Polymers (Basel) 2022; 14:polym14183752. [PMID: 36145898 PMCID: PMC9500872 DOI: 10.3390/polym14183752] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/27/2022] [Accepted: 09/02/2022] [Indexed: 11/27/2022] Open
Abstract
A three-dimensional (3D) tumor spheroid model plays a critical role in mimicking tumor microenvironments in vivo. However, the conventional culture methods lack the ability to manipulate the 3D tumor spheroids in a homogeneous manner. To address this limitation, we developed a microfluidic-based droplet system for drug screening applications. We used a tree-shaped gradient generator to control the cell density and encapsulate the cells within uniform-sized droplets to generate a 3D gradient-sized tumor spheroid. Using this microfluidic-based droplet system, we demonstrated the high-throughput generation of uniform 3D tumor spheroids containing various cellular ratios for the analysis of the anti-cancer drug cytotoxicity. Consequently, this microfluidic-based gradient droplet generator could be a potentially powerful tool for anti-cancer drug screening applications.
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Affiliation(s)
- Sang Ik Lee
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Yoon Young Choi
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
| | - Seong Goo Kang
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea
| | - Tae Hyeon Kim
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Young Jae Kim
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea
| | - Taewook Kang
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 04107, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
- Institute of Integrated Biotechnology, Sogang University, Seoul 04107, Korea
- Correspondence:
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13
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Kim JW, Choi YY, Park SH, Ha JH, Lee HU, Kang T, Sun W, Chung BG. Microfluidic electrode array chip for electrical stimulation-mediated axonal regeneration. Lab Chip 2022; 22:2122-2130. [PMID: 35388823 DOI: 10.1039/d1lc01158h] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The precise manipulation of the neural stem cell (NSC)-derived neural differentiation is still challenging, and there is a technological barrier to regulate the axonal regeneration in a controlled manner. Here, we developed a microfluidic chip integrated with a microelectrode array as an axonal guidance platform. The microfluidic electrode array chip consisted of two compartments and a bridge microchannel that could isolate and guide the axons. We demonstrated that the NSCs were largely differentiated into neural cells as the electric field was applied to the microfluidic electrode array chip. We also confirmed the synergistic effects of the electrical stimulation (ES) and neurotrophic factor (NF) on axonal outgrowth. This microfluidic electrode array chip can serve as a central nervous system (CNS) model for axonal injury and regeneration. Therefore, it could be a potentially powerful tool for an in vitro model of the axonal regeneration.
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Affiliation(s)
- Ji Woon Kim
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Yoon Young Choi
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
| | - Si-Hyung Park
- Department of Anatomy, Korea University College of Medicine, Seoul, Korea.
| | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
| | - Hee Uk Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
| | - Taewook Kang
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Korea
| | - Woong Sun
- Department of Anatomy, Korea University College of Medicine, Seoul, Korea.
| | - Bong Geun Chung
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
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14
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Jeon HG, Choi JW, Lee HU, Chung BG. Conductive Silver/Carbon Fiber Films for Rapid Detection of Human Coronavirus. Polymers (Basel) 2022; 14:polym14101983. [PMID: 35631866 PMCID: PMC9144029 DOI: 10.3390/polym14101983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 05/07/2022] [Accepted: 05/09/2022] [Indexed: 11/16/2022] Open
Abstract
Polymerase chain reaction has gained attention since the outbreak of novel coronavirus in 2019. Due to its high specificity and capability for early detection, it is considered a standard method for the diagnosis of infectious diseases. However, the conventional thermocyclers used for nucleic acid amplification are not suitable for point-of-care testing applications, as they require expensive instruments, high-power consumption, and a long turnaround time. To suppress the widespread of the pandemic, there is an urgent need for the development of a rapid, inexpensive, and portable thermal cycler. Therefore, in this paper, we present a conductive silver/carbon fiber film-based thermal cycler with low power consumption (<5 W), efficient heating (~4.5 °C/s), low cost (<USD 200), and handheld size (11.5 × 7.1 × 7.5 mm). The conductive film, which was used as a heating source of the thermal cycler, was fabricated by the electrochemical deposition method. The successful coating of Ag was characterized by a scanning electron microscope and confirmed by energy-dispersive X-ray spectroscopy. The film showed excellent electrical/thermal conductivity and durability. Using our thermal cycler, 35 cycles of amplification were accomplished within 10 min. We also successfully demonstrated the multiplexed detection of various human coronaviruses (e.g., OC43, 229E, and NL63) using our thermal cycler.
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15
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Jeon MS, Choi YY, Mo SJ, Ha JH, Lee YS, Lee HU, Park SD, Shim JJ, Lee JL, Chung BG. Contributions of the microbiome to intestinal inflammation in a gut-on-a-chip. Nano Converg 2022; 9:8. [PMID: 35133522 PMCID: PMC8825925 DOI: 10.1186/s40580-022-00299-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 01/18/2022] [Indexed: 05/07/2023]
Abstract
The intestinal microbiome affects a number of biological functions of the organism. Although the animal model is a powerful tool to study the relationship between the host and microbe, a physiologically relevant in vitro human intestinal system has still unmet needs. Thus, the establishment of an in vitro living cell-based system of the intestine that can mimic the mechanical, structural, absorptive, transport and pathophysiological properties of the human intestinal environment along with its commensal bacterial strains can promote pharmaceutical development and potentially replace animal testing. In this paper, we present a microfluidic-based gut model which allows co-culture of human and microbial cells to mimic the gastrointestinal structure. The gut microenvironment is recreated by flowing fluid at a low rate (21 μL/h) over the microchannels. Under these conditions, we demonstrated the capability of gut-on-a-chip to recapitulate in vivo relevance epithelial cell differentiation including highly polarized epithelium, mucus secretion, and tight membrane integrity. Additionally, we observed that the co-culture of damaged epithelial layer with the probiotics resulted in a substantial responded recovery of barrier function without bacterial overgrowth in a gut-on-a-chip. Therefore, this gut-on-a-chip could promote explorations interaction with host between microbe and provide the insights into questions of fundamental research linking the intestinal microbiome to human health and disease.
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Affiliation(s)
- Min Seo Jeon
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Yoon Young Choi
- Institute of Integrated Biotechnology, Sogang University, Seoul, Korea
| | | | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Young Seo Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Hee Uk Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | | | | | | | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
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16
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Choi HW, Lim JH, Kim CW, Lee E, Kim JM, Chang K, Chung BG. Near-Infrared Light-Triggered Generation of Reactive Oxygen Species and Induction of Local Hyperthermia from Indocyanine Green Encapsulated Mesoporous Silica-Coated Graphene Oxide for Colorectal Cancer Therapy. Antioxidants (Basel) 2022; 11:174. [PMID: 35052678 PMCID: PMC8772730 DOI: 10.3390/antiox11010174] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/12/2022] [Accepted: 01/14/2022] [Indexed: 02/01/2023] Open
Abstract
Near-infrared (NIR) light-mediated photothermal therapy (PTT) and photodynamic therapy (PDT) have widely been used for cancer treatment applications. However, a number of limitations (e.g., low NIR absorption capacity of photothermal agents, insufficient loading efficiency of photosensitive molecules) have hindered the widespread use of NIR-mediated cancer therapy. Therefore, we developed a mesoporous silica-coated reduced graphene oxide (rGO) nanocomposite that could provide a high encapsulation rate of indocyanine green (ICG) and enhance PTT/PDT efficiency in vitro and in vivo. The ICG-encapsulated nanocomposite not only enhances the photothermal effect but also generates a large number of tumor toxic reactive oxygen species (ROS). By conjugation of polyethylene glycol (PEG) with folic acid (FA) as a tumor targeting moiety, we confirmed that ICG-encapsulated mesoporous silica (MS)-coated rGO nanocomposite (ICG@MS-rGO-FA) exhibited high colloidal stability and intracellular uptake in folate receptor-expressing CT-26 colorectal cancer cells. Upon NIR laser irradiation, this ICG@MS-rGO-FA nanocomposite induced the apoptosis of only CT-26 cells via enhanced PTT and PDT effects without any damage to normal cells. Furthermore, the ICG@MS-rGO-FA nanocomposite revealed satisfactory tumor targeting and biocompatibility in CT-26 tumor-bearing mice, thereby enhancing the therapeutic effects of PTT and PDT in vivo. Therefore, this tumor-targeted ICG@MS-rGO-FA nanocomposite shows a great potential for phototherapy applications.
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Affiliation(s)
- Hyung Woo Choi
- Department of Mechanical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea;
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea;
| | - Chan Woo Kim
- Division of Cardiology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea; (C.W.K.); (E.L.); (J.-M.K.)
- Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea
| | - Eunmi Lee
- Division of Cardiology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea; (C.W.K.); (E.L.); (J.-M.K.)
- Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea
| | - Jin-Moo Kim
- Division of Cardiology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea; (C.W.K.); (E.L.); (J.-M.K.)
- Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea
| | - Kiyuk Chang
- Division of Cardiology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea; (C.W.K.); (E.L.); (J.-M.K.)
- Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Baekbeom-ro 35, Mapo-gu, Seoul 04107, Korea;
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17
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Ha JH, Lim JH, Kim JW, Cho HY, Jo SG, Lee SH, Eom JY, Lee JM, Chung BG. Conductive GelMA-Collagen-AgNW Blended Hydrogel for Smart Actuator. Polymers (Basel) 2021; 13:polym13081217. [PMID: 33918789 PMCID: PMC8068890 DOI: 10.3390/polym13081217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/03/2021] [Accepted: 04/08/2021] [Indexed: 12/13/2022] Open
Abstract
Blended hydrogels play an important role in enhancing the properties (e.g., mechanical properties and conductivity) of hydrogels. In this study, we generated a conductive blended hydrogel, which was achieved by mixing gelatin methacrylate (GelMA) with collagen, and silver nanowire (AgNW). The ratio of GelMA, collagen and AgNW was optimized and was subsequently gelated by ultraviolet light (UV) and heat. The scanning electron microscope (SEM) image of the conductive blended hydrogels showed that collagen and AgNW were present in the GelMA hydrogel. Additionally, rheological analysis indicated that the mechanical properties of the conductive GelMA–collagen–AgNW blended hydrogels improved. Biocompatibility analysis confirmed that the human umbilical vein endothelial cells (HUVECs) encapsulated within the three-dimensional (3D), conductive blended hydrogels were highly viable. Furthermore, we confirmed that the molecule in the conductive blended hydrogel was released by electrical stimuli-mediated structural deformation. Therefore, this conductive GelMA–collagen–AgNW blended hydrogel could be potentially used as a smart actuator for drug delivery applications.
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Affiliation(s)
- Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea;
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea; (J.H.L.); (J.W.K.)
| | - Ji Woon Kim
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea; (J.H.L.); (J.W.K.)
| | - Hyeon-Yeol Cho
- Department of Bio & Fermentation Convergence Technology, Kookmin University, Seoul 02707, Korea;
| | - Seok Geun Jo
- Division of Chemical Industry, Yeungnam University College, Daegu 42415, Korea; (S.G.J.); (S.H.L.); (J.Y.E.)
| | - Seung Hyun Lee
- Division of Chemical Industry, Yeungnam University College, Daegu 42415, Korea; (S.G.J.); (S.H.L.); (J.Y.E.)
| | - Jae Young Eom
- Division of Chemical Industry, Yeungnam University College, Daegu 42415, Korea; (S.G.J.); (S.H.L.); (J.Y.E.)
| | - Jong Min Lee
- Division of Chemical Industry, Yeungnam University College, Daegu 42415, Korea; (S.G.J.); (S.H.L.); (J.Y.E.)
- Correspondence: (J.M.L.); (B.G.C.)
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea;
- Correspondence: (J.M.L.); (B.G.C.)
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18
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Yang L, Kim TH, Cho HY, Luo J, Lee JM, Chueng STD, Hou Y, Yin PTT, Han J, Kim JH, Chung BG, Choi JW, Lee KB. Hybrid Graphene-Gold Nanoparticle-based Nucleic Acid Conjugates for Cancer-Specific Multimodal Imaging and Combined Therapeutics. Adv Funct Mater 2021; 31:2006918. [PMID: 33776614 PMCID: PMC7996391 DOI: 10.1002/adfm.202006918] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Indexed: 05/06/2023]
Abstract
Nanoparticle-based nucleic acid conjugates (NP-NACs) hold great promise for theragnostic (diagnostic and therapeutic) applications. However, several limitations have hindered the realization of their full potential in the clinical treatment of cancer and other diseases. In diagnosis, NP-NACs, combined with conventional optical sensing systems, have been applied for cancer detection in vitro, but low signal-to-noise ratios limit their broad in vivo applications. Meanwhile, the efficiency of NP-NAC-mediated cancer therapies has been limited through the adaptation of alternative pro-survival pathways in cancer cells. The recent emergence of personalized and precision medicine has outlined the importance of both accurate diagnosis and efficient therapeutics in a single platform. As such, we report the controlled assembly of hybrid graphene oxide/gold nanoparticle-based cancer-specific NACs (Au@GO NP-NACs) for multimodal imaging and combined therapeutics. Our developed Au@GO NP-NACs shows excellent surface-enhanced Raman scattering (SERS)-mediated live-cell cancer detection and multimodal synergistic cancer therapy through the use of photothermal, genetic, and chemotherapeutic strategies. Synergistic and selective killing of cancer cells were then demonstrated by using in vitro microfluidic models and nine different cancer cell lines by further incorporating near-infrared photothermal hyperthermia, a Topoisomerase II anti-cancer drug, and cancer targeting peptides. Moreover, with distinctive advantages of the Au@GO NP-NACs for cancer theragnostics, we further demonstrated precision cancer treatment through the detection of cancer cells in vivo using SERS followed by efficient ablation of the tumor. Therefore, our Au@GO NP-NACs could pave a new road for the advanced theragnostics of cancer as well as many other diseases.
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Affiliation(s)
- Letao Yang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Tae-Hyung Kim
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Hyeon-Yeol Cho
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Jeffrey Luo
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Jong-Min Lee
- Department of Mechanical Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
| | - Sy-Tsong Dean Chueng
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Yannan Hou
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Perry To-Tien Yin
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
| | - Jiyou Han
- College of Life Sciences & Biotechnology, Science Campus, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02741, Republic of Korea
| | - Jong Hoon Kim
- College of Life Sciences & Biotechnology, Science Campus, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02741, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
| | - Jeong-Woo Choi
- Department of Chemical & Biomolecular Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
| | - Ki-Bum Lee
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA
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19
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Kim YJ, Lim JH, Lee JM, Choi JW, Choi HW, Seo WH, Lee KG, Lee SJ, Chung BG. CuS/rGO-PEG Nanocomposites for Photothermal Bonding of PMMA-Based Plastic Lab-on-a-Chip. Nanomaterials (Basel) 2021; 11:176. [PMID: 33445759 PMCID: PMC7828185 DOI: 10.3390/nano11010176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/28/2020] [Accepted: 01/10/2021] [Indexed: 11/16/2022]
Abstract
We developed copper sulfide (CuS)/reduced graphene oxide (rGO)-poly (ethylene glycol) (PEG) nanocomposites for photothermal bonding of a polymethyl methacrylate (PMMA)-based plastic lab-on-a-chip. The noncontact photothermal bonding of PMMA-based plastic labs-on-chip plays an important role in improving the stability and adhesion at a high-temperature as well as minimizing the solution leakage from microchannels when connecting two microfluidic devices. The CuS/rGO-PEG nanocomposites were used to bond a PMMA-based plastic lab-on-a-chip in a short time with a high photothermal effect by a near-infrared (NIR) laser irradiation. After the thermal bonding process, a gap was not generated in the PMMA-based plastic lab-on-a-chip due to the low viscosity and density of the CuS/rGO-PEG nanocomposites. We also evaluated the physical and mechanical properties after the thermal bonding process, showing that there was no solution leakage in PMMA-based plastic lab-on-a-chip during polymerase chain reaction (PCR) thermal cycles. Therefore, the CuS/rGO-PEG nanocomposite could be a potentially useful nanomaterial for non-contact photothermal bonding between the interfaces of plastic module lab-on-a-chip.
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Affiliation(s)
- Young Jae Kim
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea; (Y.J.K.); (J.W.C.); (H.W.C.)
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea; (J.H.L.); (W.H.S.)
| | - Jong Min Lee
- Division of Chemical Industry, Yeungnam University College, Daegu 38541, Korea;
| | - Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea; (Y.J.K.); (J.W.C.); (H.W.C.)
| | - Hyung Woo Choi
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea; (Y.J.K.); (J.W.C.); (H.W.C.)
| | - Won Ho Seo
- Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea; (J.H.L.); (W.H.S.)
| | - Kyoung G. Lee
- Division of Nano-Bio Sensors/Chips Development, National NanoFab Center, Daejeon 34141, Korea; (K.G.L.); (S.J.L.)
| | - Seok Jae Lee
- Division of Nano-Bio Sensors/Chips Development, National NanoFab Center, Daejeon 34141, Korea; (K.G.L.); (S.J.L.)
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea; (Y.J.K.); (J.W.C.); (H.W.C.)
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20
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Shin HH, Choi HW, Lim JH, Kim JW, Chung BG. Near-Infrared Light-Triggered Thermo-responsive Poly(N-Isopropylacrylamide)-Pyrrole Nanocomposites for Chemo-photothermal Cancer Therapy. Nanoscale Res Lett 2020; 15:214. [PMID: 33180229 PMCID: PMC7661614 DOI: 10.1186/s11671-020-03444-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 11/02/2020] [Indexed: 05/28/2023]
Abstract
The combination therapy based on multifunctional nanocomposites has been considered as a promising approach to improve cancer therapeutic efficacy. Herein, we report targeted multi-functional poly(N-isopropylacrylamide) (PNIPAM)-based nanocomposites for synergistic chemo-photothermal therapy toward breast cancer cells. To increase the transition temperature, acrylic acid (AAc) was added in synthetic process of PNIPAM, showing that the intrinsic lower critical solution temperature was changed to 42 °C . To generate the photothermal effect under near-infrared (NIR) laser irradiation (808 nm), polypyrrole (ppy) nanoparticles were uniformly decorated in PNIPAM-AAc. Folic acid (FA), as a cancer targeting ligand, was successfully conjugated on the surplus carboxyl groups in PNIPAM network. The drug release of PNIPAM-ppy-FA nanocomposites was efficiently triggered in response to the temperature change by NIR laser irradiation. We also confirmed that PNIPAM-ppy-FA was internalized to MDA-MB-231 breast cancer cells by folate-receptor-mediated endocytosis and significantly enhanced cancer therapeutic efficacy with combination treatment of chemo-photothermal effects. Therefore, our work encourages further exploration of multi-functional nanocarrier agents for synergistic therapeutic approaches to different types of cancer cells.
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Affiliation(s)
- Ha Hee Shin
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Hyung Woo Choi
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Ji Woon Kim
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
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21
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Abstract
A miniaturized polymerase chain reaction (PCR) system is not only important for medical applications in remote areas of developing countries, but also important for testing at ports of entry during global epidemics, such as the current outbreak of the coronavirus. Although there is a large number of PCR sensor systems available for this purpose, there is still a lack of portable digital PCR (dPCR) heating systems. Here, we first demonstrated a portable plasmonic heating-based dPCR system. The device has total dimensions of 9.7 × 5.6 × 4.1 cm and a total power consumption of 4.5 W, allowing for up to 25 dPCR experiments to be conducted on a single charge of a 20 000 mAh external battery. The dPCR system has a maximum heating rate of 10.7 °C s-1 and maximum cooling rate of 8 °C s-1. Target DNA concentrations in the range from 101 ± 1.4 copies per μL to 260 000 ± 20 000 copies per μL could be detected using a poly(dimethylsiloxane) (PDMS) microwell membrane with 22 080 well arrays (20 μm diameter). Furthermore, the heating system was demonstrated using a mass producible poly(methyl methacrylate) PMMA microwell array with 8100 microwell arrays (80 μm diameter). The PMMA microwell array could detect a concentration from 12 ± 0.7 copies per μL to 25 889 ± 737 copies per μL.
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22
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Ha JH, Shin HH, Choi HW, Lim JH, Mo SJ, Ahrberg CD, Lee JM, Chung BG. Electro-responsive hydrogel-based microfluidic actuator platform for photothermal therapy. Lab Chip 2020; 20:3354-3364. [PMID: 32749424 DOI: 10.1039/d0lc00458h] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Electrical stimuli play an important role in regulating the delivery of plasmonic nanomaterials with cancer targeting peptides. Here, we developed an electro-responsive hydrogel-based microfluidic actuator platform for brain tumor targeting and photothermal therapy (PTT) applications. The electro-responsive hydrogels consisted of highly conductive silver nanowires (AgNWs) and biocompatible collagen I gels. We confirmed that an electrically conductive hydrogel could be used as an effective actuator by applying an electrical signal in the microfluidic platform. Furthermore, we successfully demonstrated PTT efficacy for brain tumor cells using targetable Arg-Gly-Asp (RGD) peptide-conjugated gold nanorods (GNRs). Therefore, our electro-responsive hydrogel-based microfluidic actuator platform could be useful for electro-responsive intelligent nanomaterial delivery and PTT applications.
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Affiliation(s)
- Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea.
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23
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Affiliation(s)
- Himanshu Kathuria
- Department of Pharmacy, National University of Singapore, Singapore 117543, Singapore
| | - Dennis Lim
- Department of Pharmacy, National University of Singapore, Singapore 117543, Singapore
| | - Junyu Cai
- School of Pharmacy, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
| | - Lifeng Kang
- School of Pharmacy, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales 2006, Australia
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24
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Kye HG, Ahrberg CD, Park BS, Lee JM, Chung BG. Separation, Purification, and Detection of cfDNA in a Microfluidic Device. BioChip J 2020. [DOI: 10.1007/s13206-020-4208-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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25
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Mun SG, Choi HW, Lee JM, Lim JH, Ha JH, Kang MJ, Kim EJ, Kang L, Chung BG. rGO nanomaterial-mediated cancer targeting and photothermal therapy in a microfluidic co-culture platform. Nano Converg 2020; 7:10. [PMID: 32180051 PMCID: PMC7076105 DOI: 10.1186/s40580-020-0220-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 01/28/2020] [Indexed: 05/15/2023]
Abstract
We developed the microfluidic co-culture platform to study photothermal therapy applications. We conjugated folic acid (FA) to target breast cancer cells using reduced graphene oxide (rGO)-based functional nanomaterials. To characterize the structure of rGO-based nanomaterials, we analyzed the molecular spectrum using UV-visible and Fourier-transform infrared spectroscopy (FT-IR). We demonstrated the effect of rGO-FA-based nanomaterials on photothermal therapy of breast cancer cells in the microfluidic co-culture platform. From the microfluidic co-culture platform with breast cancer cells and human umbilical vein endothelial cells (HUVECs), we observed that the viability of breast cancer cells treated with rGO-FA-based functional nanomaterials was significantly decreased after near-infrared (NIR) laser irradiation. Therefore, this microfluidic co-culture platform could be a potentially powerful tool for studying cancer cell targeting and photothermal therapy.
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Affiliation(s)
- Seok Gyu Mun
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | | | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | | | | | - Lifeng Kang
- School of Pharmacy, University of Sydney, Sydney, NSW, Australia
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
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26
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Lee JM, Choi JW, Ahrberg CD, Choi HW, Ha JH, Mun SG, Mo SJ, Chung BG. Generation of tumor spheroids using a droplet-based microfluidic device for photothermal therapy. Microsyst Nanoeng 2020; 6:52. [PMID: 34567663 PMCID: PMC8433304 DOI: 10.1038/s41378-020-0167-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 04/02/2020] [Indexed: 05/21/2023]
Abstract
Despite their simplicity, monolayer cell cultures are not able to accurately predict drug behavior in vivo due to their inability to accurately mimic cell-cell and cell-matrix interactions. In contrast, cell spheroids are able to reproduce these interactions and thus would be a viable tool for testing drug behavior. However, the generation of homogenous and reproducible cell spheroids on a large scale is a labor intensive and slow process compared to monolayer cell cultures. Here, we present a droplet-based microfluidic device for the automated, large-scale generation of homogenous cell spheroids in a uniform manner. Using the microfluidic system, the size of the spheroids can be tuned to between 100 and 130 μm with generation frequencies of 70 Hz. We demonstrated the photothermal therapy (PTT) application of brain tumor spheroids generated by the microfluidic device using a reduced graphene oxide-branched polyethyleneimine-polyethylene glycol (rGO-BPEI-PEG) nanocomposite as the PTT agent. Furthermore, we generated uniformly sized neural stem cell (NSC)-derived neurospheres in the droplet-based microfluidic device. We also confirmed that the neurites were regulated by neurotoxins. Therefore, this droplet-based microfluidic device could be a powerful tool for photothermal therapy and drug screening applications.
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Affiliation(s)
- Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
- Division of Chemical Industry, Yeungnam University College, Daegu, Republic of Korea
| | - Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | | | | | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Seok Gyu Mun
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Sung Joon Mo
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
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27
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Mo SJ, Lee JH, Kye HG, Lee JM, Kim EJ, Geum D, Sun W, Chung BG. A microfluidic gradient device for drug screening with human iPSC-derived motoneurons. Analyst 2020; 145:3081-3089. [DOI: 10.1039/c9an02384d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We developed a microfluidic gradient device to utilize as a drug screening system with human induced pluripotent stem cell (hiPSC)-derived motoneurons.
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Affiliation(s)
- Sung Joon Mo
- Department of Biomedical Engineering
- Sogang University
- Korea
| | - Ju-Hyun Lee
- Department of Anatomy
- Brain Korea 21 Program
- Korea University College of Medicine
- Seoul
- Korea
| | - Hyeon Gi Kye
- Department of Mechanical Engineering
- Sogang University
- Seoul
- Korea
| | - Jong Min Lee
- Department of Mechanical Engineering
- Sogang University
- Seoul
- Korea
| | | | - Dongho Geum
- Department of Biomedical Sciences
- Korea University College of Medicine
- Seoul
- Korea
| | - Woong Sun
- Department of Anatomy
- Brain Korea 21 Program
- Korea University College of Medicine
- Seoul
- Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering
- Sogang University
- Seoul
- Korea
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28
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Park BS, Kye HG, Kim TH, Lee JM, Ahrberg CD, Cho EM, Yang SI, Chung BG. Continuous separation of fungal spores in a microfluidic flow focusing device. Analyst 2019; 144:4962-4971. [PMID: 31322144 DOI: 10.1039/c9an00905a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The research of fungi is of great importance in a number of fields, such as environmental and healthcare studies. While there are a large number of optical and molecular methods available for characterization and identification of fungi and their spores, their isolation is still conducted using slow and labor-intensive methods. Here, we develop a microfluidic device for the continuous separation of fungal spores from other eukaryotic cells. The spores were separated through the microfluidic device by expanding pinched flow fractionation (PFF) containing the spores, achieving a spatial separation perpendicular to the flow direction according to the spore size. Further branch flow fractionation (BFF) and co-flow of a Newtonian and viscoelastic fluid were used to enhance the separation performance. Using this microfluidic device, we demonstrated the separation of two different types of fungal spores and further separation of fungal spores from eukaryotic cells with a separation efficiency of above 90%. Compared to the existing conventional methods, our microfluidic flow focusing device requires little manual handling and uses small amounts of samples without any pre-treatment steps of the samples.
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Affiliation(s)
- Byeong Seon Park
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea.
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29
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Kye HG, Park BS, Lee JM, Song MG, Song HG, Ahrberg CD, Chung BG. Dual-neodymium magnet-based microfluidic separation device. Sci Rep 2019; 9:9502. [PMID: 31263123 PMCID: PMC6602928 DOI: 10.1038/s41598-019-45929-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 06/20/2019] [Indexed: 12/21/2022] Open
Abstract
Microfluidic-based separation methods have been highlighted for a number of biological applications, such as single cell analysis, disease diagnostics, and therapeutics. Although a number of previous studies have been carried out to minimize the physical damage and chemical deformations of the sample during the separation process, it still remains a challenge. In this paper, we developed a microfluidic device with dual-neodymium magnet-based negative magnetophoresis for the separation of the microparticles and cells. The poly(ethylene oxide) (PEO) was added to the solution to increase the viscoelasticity of the medium which could assist the sorting of the microparticles in the microfluidic device even at low flow rates, while minimizing damage to the cells and microparticles. Following this method, it was possible to separate 10 and 16 μm microparticles with high efficiency of 99 ± 0.1%, and 97 ± 0.8%, respectively. We also demonstrated the separation of glioblastoma cancer cells and neural stem cells (NSCs) in the microfluidic device.
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Affiliation(s)
- Hyeon Gi Kye
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Byeong Seon Park
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Min Gyu Song
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Han Gyeol Song
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Christian D Ahrberg
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea.
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30
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Ha JH, Mazumdar H, Kim TH, Lee JM, Na JG, Chung BG. Algorithm Analysis of Gas Bubble Generation in a Microfluidic Device. BioChip J 2019. [DOI: 10.1007/s13206-018-3203-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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31
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Kim YK, Kim EJ, Lim JH, Cho HK, Hong WJ, Jeon HH, Chung BG. Dual Stimuli-Triggered Nanogels in Response to Temperature and pH Changes for Controlled Drug Release. Nanoscale Res Lett 2019; 14:77. [PMID: 30830486 PMCID: PMC6399374 DOI: 10.1186/s11671-019-2909-y] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 02/21/2019] [Indexed: 05/19/2023]
Abstract
Poly-N-isopropyl acrylamide (PNIPAM) nanogels have been modified with different acrylic acid (AAc) contents for the efficient control of lower critical solution temperature (LCST). In this study, PNIPAM-co-AAc nanogels nanogels showed two volume phase transitions in comparison with PNIPAM. The transition temperature of PNIPAM nanogels was increased with AAc contents. The controlled drug release performance of PNIPAM-co-AAc nanogels loaded with β-lapachone was attributed to the AAc content ratio and was efficiently triggered in response to temperature and pH. Moreover, a colorimetric cell proliferation assay and direct fluorescence-based live/dead staining were used to confirm the concurrence on drug release profiles. Finally, PNIPAM-co-AAc20 showed a relatively low level of drug release in the range of acidic to neutral pH at body temperature, while maximizing drug release at basic pH. Therefore, we demonstrated that the PNIPAM-based nanogel with the temperature- and pH-responsive features could be a promising nanocarrier for potential intestine-specific drug delivery.
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Affiliation(s)
- Yun Kyoung Kim
- Department of Biomedical Engineering, Sogang University, Seoul, 04107 South Korea
| | - Eun-Joong Kim
- Research Center, Sogang University, Seoul, 04107 South Korea
| | - Jae Hyun Lim
- Department of Biomedical Engineering, Sogang University, Seoul, 04107 South Korea
| | - Heui Kyoung Cho
- Cosmetic Research Center, Coway Co. Ltd., Seoul, 08502 South Korea
| | - Woo Jin Hong
- Cosmetic Research Center, Coway Co. Ltd., Seoul, 08502 South Korea
| | - Hyang Hwa Jeon
- Cosmetic Research Center, Coway Co. Ltd., Seoul, 08502 South Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, 04107 South Korea
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32
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Lee JM, Park DY, Yang L, Kim EJ, Ahrberg CD, Lee KB, Chung BG. Generation of uniform-sized multicellular tumor spheroids using hydrogel microwells for advanced drug screening. Sci Rep 2018; 8:17145. [PMID: 30464248 PMCID: PMC6249215 DOI: 10.1038/s41598-018-35216-7] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 11/01/2018] [Indexed: 12/17/2022] Open
Abstract
Even though in vitro co-culture tumor spheroid model plays an important role in screening drug candidates, its wide applications are currently limited due to the lack of reliable and high throughput methods for generating well-defined and 3D complex co-culture structures. Herein, we report the development of a hydrogel microwell array to generate uniform-sized multicellular tumor spheroids. Our developed multicellular tumor spheroids are structurally well-defined, robust and can be easily transferred into the widely used 2D culture substrates while maintaining our designed multicellular 3D-sphere structures. Moreover, to develop effective anti-cancer therapeutics we integrated our recently developed gold-graphene hybrid nanomaterial (Au@GO)-based photothermal cancer therapy into a series of multicellular tumor spheroid co-culture system. The multicellular tumor spheroids were harvested onto a two-dimensional (2D) substrate, under preservation of their three-dimensional (3D) structure, to evaluate the photothermal therapy effectiveness of graphene oxide (GO)-wrapped gold nanoparticles (Au@GO). From the model of co-culture spheroids of HeLa/Ovarian cancer and HeLa/human umbilical vein endothelial cell (HUVEC), we observed that Au@GO nanoparticles displayed selectivity towards the fast-dividing HeLa cells, which could not be observed to this extent in 2D cultures. Overall, our developed uniform-sized 3D multicellular tumor spheroid could be a powerful tool for anticancer drug screening applications.
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Affiliation(s)
- Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Da Yeon Park
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Letao Yang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Jersey, USA
| | | | | | - Ki-Bum Lee
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Jersey, USA.
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul, Korea.
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
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33
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Seo JR, Choi HW, Kim DE, Park DY, Kim EJ, Chung BG. Facile Synthesis of Surfactant-Free Au Decorated Hollow Silica Nanoparticles for Photothermal Applications. Macromol Res 2018. [DOI: 10.1007/s13233-018-6143-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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34
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Ahrberg CD, Choi JW, Chung BG. Droplet-based synthesis of homogeneous magnetic iron oxide nanoparticles. Beilstein J Nanotechnol 2018; 9:2413-2420. [PMID: 30254836 PMCID: PMC6142730 DOI: 10.3762/bjnano.9.226] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 08/23/2018] [Indexed: 05/29/2023]
Abstract
Nanoparticles have gained large interest in a number of different fields due to their unique properties. In medical applications, for example, magnetic nanoparticles can be used for targeting, imaging, magnetically induced thermotherapy, or for any combination of the three. However, it is still a challenge to obtain narrowly dispersed, reproducible particles through a typical lab-scale synthesis when researching these materials. Here, we present a droplet capillary reactor that can be used for the synthesis of magnetic iron oxide nanoparticles. Compared to conventional batch synthesis, the particles synthesized in our droplet reactor have a narrower size distribution and a higher reproducibility. Furthermore, we demonstrate how the particle size can be changed from 5.2 ± 0.9 nm to 11.8 ± 1.7 nm by changing the reaction temperature and droplet residence time in the droplet capillary reactor.
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Affiliation(s)
| | - Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
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35
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Kim DE, Lee JM, Ahrberg CD, Shaker MR, Lee JH, Sun W, Chung BG. Micropillar-based microfluidic device to regulate neurite networks of uniform-sized neurospheres. Electrophoresis 2018; 40:419-424. [PMID: 29931692 DOI: 10.1002/elps.201800119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 06/15/2018] [Accepted: 06/17/2018] [Indexed: 02/03/2023]
Abstract
The inability of neurons to undergo mitosis renders damage to the central or peripheral nervous system. Neural stem cell therapy could provide a path for treating the neurodegenerative diseases. However, reliable and simple tools for the developing and testing neural stem cell therapy are still required. Here, we show the development of a micropillar-based microfluidic device to trap the uniform-sized neurospheres. The neurospheres trapped within micropillar arrays were largely differentiated into neuronal cells, and their neurite networks were observed in the microfluidic device. Compared to conventional cultures on glass slides, the neurite networks generated with this method have a higher reproducibility. Furthermore, we demonstrated the effect of thapsigargin on the neurite networks in the microfluidic device, demonstrating that neural networks exposed to thapsigargin were largely diminished and disconnected from each other. Therefore, this micropillar-based microfluidic device could be a potential tool for screening of neurotoxins.
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Affiliation(s)
- Da Eun Kim
- Department of Biomedical Engineering, Sogang University, Seoul, Republic of Korea
| | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | | | - Mohammed R Shaker
- Department of Anatomy, Brain Korea 21 Program, Korea University College of Medicine, Seoul, Republic of Korea
| | - Ju-Hyun Lee
- Department of Anatomy, Brain Korea 21 Program, Korea University College of Medicine, Seoul, Republic of Korea
| | - Woong Sun
- Department of Anatomy, Brain Korea 21 Program, Korea University College of Medicine, Seoul, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
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36
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Park DY, Kim TH, Lee JM, Ahrberg CD, Chung BG. Circular-shaped microfluidic device to study the effect of shear stress on cellular orientation. Electrophoresis 2018; 39:1816-1820. [PMID: 29659029 DOI: 10.1002/elps.201800109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 04/06/2018] [Accepted: 04/09/2018] [Indexed: 12/11/2022]
Abstract
Understanding the effects of shear stress on mammalian cells is a crucial factor for understanding a number of biological processes and diseases. Here, we show the development of a circular-shaped microfluidic device for the facile generation of shear stress gradients. With this microfluidic device, the effect of shear stress on orientation of human umbilical vein endothelial cells was studied. This microfluidic device, which enables to control the alignment of human umbilical vein endothelial cells within a microchannel, can be a valuable tool to mimic blood vessels.
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Affiliation(s)
- Da Yeon Park
- Department of Biomedical Engineering, Sogang University, Seoul, Korea
| | - Tae Hyeon Kim
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
| | | | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea
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37
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38
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Abstract
Precise determination of particle or cell numbers is of importance for a wide array of applications in environmental studies, medical and biological applications, or manufacturing and monitoring applications in industrial production processes. A number of techniques ranging from manual counting to sophisticated equipment (e.g., flow cytometry) are available for this task. However, these methods are either labour intensive, prone to error, or require expensive equipment. Here, we present a fast, simple method for determining the number density of cells or microparticles using a microwell array. We analyze the light transmission of the microwells and categorize the microwells into two groups. As particles/cells contained in a microwell locally reduce the light transmission, these wells displayed a lower average transmission compared to unoccupied microwells. The number density of particles/cells can be calculated by Poisson statistics from the ratio of occupied to unoccupied microwells. Following this approach, the number densities of two different types of microparticles, as well as HeLa and E. Coli cells, ranging over four orders of magnitude were determined. Through the microwell array defined by microfabrication, a simple image recognition algorithm can be used with the formation of aggregates or irregular shaped samples providing no additional difficulty to the microwell recognition. Additionally, this method can be carried out using only simple equipment and data analysis automated by a computer program.
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Affiliation(s)
- Christian D Ahrberg
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea.
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39
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Mazumdar H, Kim TH, Lee JM, Ha JH, Ahrberg CD, Chung BG. Prediction analysis and quality assessment of microwell array images. Electrophoresis 2018; 39:948-956. [PMID: 29323408 DOI: 10.1002/elps.201700460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 12/29/2017] [Accepted: 12/29/2017] [Indexed: 11/11/2022]
Abstract
Microwell arrays are widely used for the analysis of fluorescent-labelled biomaterials. For rapid detection and automated analysis of microwell arrays, the computational image analysis is required. Support Vector Machines (SVM) can be used for this task. Here, we present a SVM-based approach for the analysis of microwell arrays consisting of three distinct steps: labeling, training for feature selection, and classification into three classes. The three classes are filled, partially filled, and unfilled microwells. Next, the partially filled wells are analyzed by SVM and their tendency towards filled or unfilled tested through applying a Gaussian filter. Through this, all microwells can be categorized as either filled or unfilled by our algorithm. Therefore, this SVM-based computational image analysis allows for an accurate and simple classification of microwell arrays.
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Affiliation(s)
- Hirak Mazumdar
- Department of Biomedical Engineering, Sogang University, Seoul, Republic of Korea
| | - Tae Hyeon Kim
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Christian D Ahrberg
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea
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40
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Choi JW, Lee JM, Kim TH, Ha JH, Ahrberg CD, Chung BG. Dual-nozzle microfluidic droplet generator. Nano Converg 2018; 5:12. [PMID: 29755924 PMCID: PMC5938299 DOI: 10.1186/s40580-018-0145-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 04/21/2018] [Indexed: 05/10/2023]
Abstract
The droplet-generating microfluidics has become an important technique for a variety of applications ranging from single cell analysis to nanoparticle synthesis. Although there are a large number of methods for generating and experimenting with droplets on microfluidic devices, the dispensing of droplets from these microfluidic devices is a challenge due to aggregation and merging of droplets at the interface of microfluidic devices. Here, we present a microfluidic dual-nozzle device for the generation and dispensing of uniform-sized droplets. The first nozzle of the microfluidic device is used for the generation of the droplets, while the second nozzle can accelerate the droplets and increase the spacing between them, allowing for facile dispensing of droplets. Computational fluid dynamic simulations were conducted to optimize the design parameters of the microfluidic device.
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Affiliation(s)
- Ji Wook Choi
- Department of Mechanical Engineering, Sogang University, Seoul, 04107 Republic of Korea
| | - Jong Min Lee
- Department of Mechanical Engineering, Sogang University, Seoul, 04107 Republic of Korea
| | - Tae Hyun Kim
- Department of Mechanical Engineering, Sogang University, Seoul, 04107 Republic of Korea
| | - Jang Ho Ha
- Department of Mechanical Engineering, Sogang University, Seoul, 04107 Republic of Korea
| | | | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, 04107 Republic of Korea
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41
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Sharma A, Kim EJ, Shi H, Lee JY, Chung BG, Kim JS. Development of a theranostic prodrug for colon cancer therapy by combining ligand-targeted delivery and enzyme-stimulated activation. Biomaterials 2017; 155:145-151. [PMID: 29175083 DOI: 10.1016/j.biomaterials.2017.11.019] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 11/13/2017] [Accepted: 11/17/2017] [Indexed: 01/03/2023]
Abstract
The high incidence of colorectal cancer worldwide is currently a major health concern. Although conventional chemotherapy and surgery are effective to some extent, there is always a risk of relapse due to associated side effects, including post-surgical complications and non-discrimination between cancer and normal cells. In this study, we developed a small molecule-based theranostic system, Gal-Dox, which is preferentially taken up by colon cancer cells through receptor-mediated endocytosis. After cancer-specific activation, the active drug Dox (doxorubicin) is released with a fluorescence turn-on response, allowing both drug localization and site of action to be monitored. The therapeutic potency of Gal-Dox was also evaluated, both in vivo and ex vivo, thus illustrating the potential of Gal-Dox as a colorectal cancer theranostic with great specificity.
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Affiliation(s)
- Amit Sharma
- Department of Chemistry, Korea University, Seoul 02841, South Korea
| | - Eun-Joong Kim
- Department of Mechanical Engineering, Sogang University, Seoul 04107, South Korea
| | - Hu Shi
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea
| | - Jin Yong Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea.
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul 04107, South Korea.
| | - Jong Seung Kim
- Department of Chemistry, Korea University, Seoul 02841, South Korea.
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42
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Lee JM, Moon JY, Shaker MR, Sun W, Chung BG. Uniform-sized neurosphere-mediated motoneuron differentiation in microwell arrays. Electrophoresis 2017; 38:3161-3167. [DOI: 10.1002/elps.201700118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 08/01/2017] [Accepted: 08/03/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Jong Min Lee
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | - Joo Yoon Moon
- Department of Biomedical Engineering; Sogang University; Seoul Korea
| | - Mohammed R. Shaker
- Department of Anatomy, Brain Korea 21 Program; Korea University College of Medicine; Seoul Korea
| | - Woong Sun
- Department of Anatomy, Brain Korea 21 Program; Korea University College of Medicine; Seoul Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering; Sogang University; Seoul Korea
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43
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Lee JM, Seo HI, Bae JH, Chung BG. Hydrogel microfluidic co-culture device for photothermal therapy and cancer migration. Electrophoresis 2017. [DOI: 10.1002/elps.201770071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Lee JM, Seo HI, Bae JH, Chung BG. Hydrogel microfluidic co-culture device for photothermal therapy and cancer migration. Electrophoresis 2017; 38:1318-1324. [DOI: 10.1002/elps.201600540] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 02/02/2017] [Accepted: 02/02/2017] [Indexed: 12/27/2022]
Affiliation(s)
- Jong Min Lee
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | - Hye In Seo
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | - Jun Hyuk Bae
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering; Sogang University; Seoul Korea
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45
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Ha JH, Kim TH, Lee JM, Ahrberg CD, Chung BG. Analysis of 3D multi-layer microfluidic gradient generator. Electrophoresis 2016; 38:270-277. [DOI: 10.1002/elps.201600443] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 10/26/2016] [Accepted: 10/27/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Jang Ho Ha
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | - Tae Hyeon Kim
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | - Jong Min Lee
- Department of Mechanical Engineering; Sogang University; Seoul Korea
| | | | - Bong Geun Chung
- Department of Mechanical Engineering; Sogang University; Seoul Korea
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46
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Abstract
The invention of the polymerase chain reaction (PCR) has caused a revolution in molecular biology, giving access to a method of amplifying deoxyribonucleic acid (DNA) molecules across several orders of magnitude. Since the first application of PCR in a microfluidic device was developed in 1998, an increasing number of researchers have continued the development of microfluidic PCR systems. In this review, we introduce recent developments in microfluidic-based space and time domain devices as well as discuss various designs integrated with multiple functions for sample preparation and detection. The development of isothermal nucleic acid amplification and digital PCR microfluidic devices within the last five years is also highlighted. Furthermore, we introduce various commercial microfluidic PCR devices.
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Affiliation(s)
| | - Andreas Manz
- Microfluidics group, KIST-Europe, Saarbrücken, Germany and Mechanotronics Department, Universität des Saarlandes, Saarbrücken, Germany
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University, Seoul, Korea.
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47
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Abstract
The protein-functionalized reduced graphene oxide (rGO) nanosheet is of great interest in stimuli-responsive drug delivery and controlled release applications. We developed doxorubicin (DOX)-loaded bovine serum albumin (BSA)-functionalized rGO (DOX-BSA-rGO) nanosheets. To investigate the reduction of BSA-functionalized GO nanosheets and drug loading efficiency, we used X-ray photoelectron spectroscopy (XPS) and UV-visible spectrophotometer analysis. DOX-BSA-rGO nanosheets exhibited dose-dependent cellular uptake without any cytotoxic effect. We also demonstrated near-infrared (NIR)-induced chemo-photothermal therapy of brain tumor cells treated with DOX-BSA-rGO nanosheets. Therefore, this DOX-BSA-rGO nanosheet could be a powerful tool for chemo-photothermal therapy applications.
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Affiliation(s)
- Yeong Ah Cheon
- Department of Mechanical Engineering, Sogang University , Seoul 121-742, Korea
| | - Jun Hyuk Bae
- Department of Mechanical Engineering, Sogang University , Seoul 121-742, Korea
| | - Bong Geun Chung
- Department of Mechanical Engineering, Sogang University , Seoul 121-742, Korea
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49
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Seo HI, Cho AN, Jang J, Kim DW, Cho SW, Chung BG. Thermo-responsive polymeric nanoparticles for enhancing neuronal differentiation of human induced pluripotent stem cells. Nanomedicine: Nanotechnology, Biology and Medicine 2015; 11:1861-9. [DOI: 10.1016/j.nano.2015.05.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 05/15/2015] [Accepted: 05/25/2015] [Indexed: 12/22/2022]
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