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Kim EJ, Kang HW, Park SM. Determinants of the happiness of adolescents: A leisure perspective. PLoS One 2024; 19:e0301843. [PMID: 38593163 PMCID: PMC11003699 DOI: 10.1371/journal.pone.0301843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 03/23/2024] [Indexed: 04/11/2024] Open
Abstract
Leisure plays a key role in the happiness of youth. Studies have shown that various factors of leisure, such as the type, the time, the cost, and the space, have an influence on the adolescents' happiness. However, little is known about which of these factors is a major factor in youth's happiness. The purpose of this study is to explore the leisure factors that determine happiness in adolescents by examining the relationship between happiness and various leisure factors. The study used the method of machine learning to analyze national statistical data, National Leisure Activity Survey. The data used in this study were from the National Leisure Activity Survey 2019, which is a national statistic produced by the Ministry of Culture, Sports and Tourism in the Republic of Korea. The analysis found that leisure perceptions, academic and leisure balance, and public leisure space have a very important impact on the adolescents' well-being. The findings of this research may contribute to a better understanding of leisure and happiness in adolescents, and will also help adolescents make better use of their leisure time, leading to better leisure lives, and ultimately contribute to raising their level of happiness.
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Affiliation(s)
- Eui-Jae Kim
- Department of Recreation and Leisure Sports, College of Sport Science, Dankook University, Cheonan, Chungcheongnam-do, Republic of Korea
| | - Hyun-Wook Kang
- Department of Recreation and Leisure Sports, College of Sport Science, Dankook University, Cheonan, Chungcheongnam-do, Republic of Korea
| | - Seong-Man Park
- Department of English Language, College of Foreign Languages, Dankook University, Cheonan, Chungcheongnam-do, Republic of Korea
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Kim MK, Park J, Tak S, Paek K, Bang G, Woo SM, Ravichandran NK, Hong WG, Kang HW, Kim H, Bae JY, Kim JA. A long-term storable gel-laden chip composite built in a multi-well plate enabling in situcell encapsulation for high-throughput liver model. Biofabrication 2024; 16:025020. [PMID: 38390723 DOI: 10.1088/1758-5090/ad28ef] [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: 10/11/2023] [Accepted: 02/13/2024] [Indexed: 02/24/2024]
Abstract
Hydrogels are widely used as scaffold materials for constructingin vitrothree-dimensional microphysiological systems. However, their high sensitivity to various external cues hinders the development of hydrogel-laden, microscale, and high-throughput chips. Here, we have developed a long-term storable gel-laden chip composite built in a multi-well plate, which enablesin situcell encapsulation and facilitates high-throughput analysis. Through optimized chemical crosslinking and freeze-drying method (C/FD), we have achieved a high-quality of gel-laden chip composite with excellent transparency, uniform porosity, and appropriate swelling and mechanical characteristics. Besides collagen, decellularized extracellular matrix with tissue-specific biochemical compound has been applied as chip composite. As a ready-to-use platform,in situcell encapsulation within the gel has been achieved through capillary force generated during gel reswelling. The liver-mimetic chip composite, comprising HepG2 cells or primary hepatocytes, has demonstrated favorable hepatic functionality and high sensitivity in drug testing. The developed fabrication process with improved stability of gels and storability allows chip composites to be stored at a wide range of temperatures for up to 28 d without any deformation, demonstrating off-the-shelf products. Consequently, this provides an exceptionally simple and long-term storable platform that can be utilized for an efficient tissue-specific modeling and various biomedical applications.
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Affiliation(s)
- Min Kyeong Kim
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Jubin Park
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
- Program in Biomicro System Technology, Korea University, Seoul 02841, Republic of Korea
| | - Sungho Tak
- Center for Bio-Imaging and Translational Research, Korea Basic Science Institute, Cheongju 28119, Chungbuk, Republic of Korea
| | - Kyurim Paek
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
- Program in Biomicro System Technology, Korea University, Seoul 02841, Republic of Korea
| | - Geul Bang
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Cheongju 28119, Chungbuk, Republic of Korea
| | - Sang-Mi Woo
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Naresh Kumar Ravichandran
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Won Gi Hong
- Research Center for Materials Analysis, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulju-gun 44919, Ulsan, Republic of Korea
| | - Hyang Kim
- Institute of New Horizon Regenerative Medicine, Myongji Hospital, Goyang 10475, Republic of Korea
| | - Ji Yong Bae
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Jeong Ah Kim
- Center for Scientific Instrumentation, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
- Department of Bio-Analytical Science, University of Science and Technology, Daejeon 34113, Republic of Korea
- Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul 06974, Republic of Korea
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Myung N, Kang HW. Local dose-dense chemotherapy for triple-negative breast cancer via minimally invasive implantation of 3D printed devices. Asian J Pharm Sci 2024; 19:100884. [PMID: 38357526 PMCID: PMC10861843 DOI: 10.1016/j.ajps.2024.100884] [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: 07/18/2023] [Revised: 10/18/2023] [Accepted: 11/18/2023] [Indexed: 02/16/2024] Open
Abstract
Dose-dense chemotherapy is the preferred first-line therapy for triple-negative breast cancer (TNBC), a highly aggressive disease with a poor prognosis. This treatment uses the same drug doses as conventional chemotherapy but with shorter dosing intervals, allowing for promising clinical outcomes with intensive treatment. However, the frequent systemic administration used for this treatment results in systemic toxicity and low patient compliance, limiting therapeutic efficacy and clinical benefit. Here, we report local dose-dense chemotherapy to treat TNBC by implanting 3D printed devices with time-programmed pulsatile release profiles. The implantable device can control the time between drug releases based on its internal microstructure design, which can be used to control dose density. The device is made of biodegradable materials for clinical convenience and designed for minimally invasive implantation via a trocar. Dose density variation of local chemotherapy using programmable release enhances anti-cancer effects in vitro and in vivo. Under the same dose density conditions, device-based chemotherapy shows a higher anti-cancer effect and less toxic response than intratumoral injection. We demonstrate local chemotherapy utilizing the implantable device that simulates the drug dose, number of releases, and treatment duration of the dose-dense AC (doxorubicin and cyclophosphamide) regimen preferred for TNBC treatment. Dose density modulation inhibits tumor growth, metastasis, and the expression of drug resistance-related proteins, including p-glycoprotein and breast cancer resistance protein. To the best of our knowledge, local dose-dense chemotherapy has not been reported, and our strategy can be expected to be utilized as a novel alternative to conventional therapies and improve anti-cancer efficiency.
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Affiliation(s)
- Noehyun Myung
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulju-gun 44919, South Korea
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulju-gun 44919, South Korea
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Huh J, Parra JPRLL, Copus JS, Kang HW, Bishop CE, Soker S, Murphy S, Shupe TD, Yoo JJ, Lee SJ, Atala A. 3D Bioprinted Liver-on-a-Chip for Drug Cytotoxicity Screening. Tissue Eng Part A 2024. [PMID: 38126301 DOI: 10.1089/ten.tea.2023.0212] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023] Open
Abstract
Tissues on a chip are sophisticated three-dimensional (3D) in vitro microphysiological systems designed to replicate human tissue conditions within dynamic physicochemical environments. However, the current fabrication methods for tissue spheroids on a chip require multiple parts and manual processing steps, including the deposition of spheroids onto prefabricated "chips." These challenges also lead to limitations regarding scalability and reproducibility. To overcome these challenges, we employed 3D printing techniques to automate the fabrication process of tissue spheroids on a chip. This allowed the simultaneous high-throughput printing of human liver spheroids and their surrounding polymeric flow chamber "chips" containing inner channels in a single step. The fabricated liver tissue spheroids on a liver-on-a-chip (LOC) were subsequently subjected to dynamic culturing by a peristaltic pump, enabling assessment of cell viability and metabolic activities. The 3D printed liver spheroids within the printed chips demonstrated high cell viability (>80%), increased spheroid size, and consistent adenosine triphosphate (ATP) activity and albumin production for up to 14 days. Furthermore, we conducted a study on the effects of acetaminophen (APAP), a nonsteroidal anti-inflammatory drug, on the LOC. Comparative analysis revealed a substantial decline in cell viability (<40%), diminished ATP activity, and reduced spheroid size after 7 days of culture within the APAP-treated LOC group, compared to the nontreated groups. These results underscore the potential of 3D bioprinted tissue chips as an advanced in vitro model that holds promise for accurately studying in vivo biological processes, including the assessment of tissue response to administered drugs, in a high-throughput manner.
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Affiliation(s)
- JunTae Huh
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, North Carolina, USA
| | - Joao Paulo R L L Parra
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- Department of Chemistry and Biological Sciences, Botucatu Biosciences Institute, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Joshua S Copus
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, North Carolina, USA
| | - Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea
| | - Colin E Bishop
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - Sean Murphy
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - Thomas D Shupe
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, North Carolina, USA
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, North Carolina, USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, North Carolina, USA
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Kim MK, Jeong W, Jeon S, Kang HW. 3D bioprinting of dECM-incorporated hepatocyte spheroid for simultaneous promotion of cell-cell and -ECM interactions. Front Bioeng Biotechnol 2023; 11:1305023. [PMID: 38026892 PMCID: PMC10679743 DOI: 10.3389/fbioe.2023.1305023] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 10/30/2023] [Indexed: 12/01/2023] Open
Abstract
The cell spheroid technology, which greatly enhances cell-cell interactions, has gained significant attention in the development of in vitro liver models. However, existing cell spheroid technologies still have limitations in improving hepatocyte-extracellular matrix (ECM) interaction, which have a significant impact on hepatic function. In this study, we have developed a novel bioprinting technology for decellularized ECM (dECM)-incorporated hepatocyte spheroids that could enhance both cell-cell and -ECM interactions simultaneously. To provide a biomimetic environment, a porcine liver dECM-based cell bio-ink was developed, and a spheroid printing process using this bio-ink was established. As a result, we precisely printed the dECM-incorporated hepatocyte spheroids with a diameter of approximately 160-220 μm using primary mouse hepatocyte (PMHs). The dECM materials were uniformly distributed within the bio-printed spheroids, and even after more than 2 weeks of culture, the spheroids maintained their spherical shape and high viability. The incorporation of dECM also significantly improved the hepatic function of hepatocyte spheroids. Compared to hepatocyte-only spheroids, dECM-incorporated hepatocyte spheroids showed approximately 4.3- and 2.5-fold increased levels of albumin and urea secretion, respectively, and a 2.0-fold increase in CYP enzyme activity. These characteristics were also reflected in the hepatic gene expression levels of ALB, HNF4A, CPS1, and others. Furthermore, the dECM-incorporated hepatocyte spheroids exhibited up to a 1.8-fold enhanced drug responsiveness to representative hepatotoxic drugs such as acetaminophen, celecoxib, and amiodarone. Based on these results, it can be concluded that the dECM-incorporated spheroid printing technology has great potential for the development of highly functional in vitro liver tissue models for drug toxicity assessment.
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Affiliation(s)
- Min Kyeong Kim
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
- Center for Scientific Instrumentation, Korea Basic Science Institute, Chungbuk, Republic of Korea
| | - Wonwoo Jeong
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, United States
| | - Seunggyu Jeon
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, United States
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
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Jeong JO, Ju YM, Kang HW, Atala A, Yoo JJ, Lee SJ. Biofunctionalized Electrospun Vascular Scaffolds for Enhanced Antithrombotic Properties and In Situ Endothelialization. ACS Appl Mater Interfaces 2023. [PMID: 37923557 DOI: 10.1021/acsami.3c13738] [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] [Indexed: 11/07/2023]
Abstract
The development of innovative vascular substitutes has become increasingly significant due to the prevalence of vascular diseases. In this study, we designed a biofunctionalized electrospun vascular scaffold by chemically conjugating heparin molecules as an antithrombotic agent with an endothelial cell (EC)-specific antibody to promote in situ endothelialization. To optimize this biofunctionalized electrospun vascular scaffolding system, we examined various parameters, including material compositions, cross-linker concentrations, and cross-linking and conjugation processes. The findings revealed that a higher degree of heparin conjugation onto the vascular scaffold resulted in improved antithrombotic properties, as confirmed by the platelet adhesion test. Additionally, the flow chamber study demonstrated that the EC-specific antibody immobilization enhanced the scaffold's EC-capturing capability compared to a nonconjugated vascular scaffold. The optimized biofunctionalized vascular scaffolds also displayed exceptional mechanical properties, such as suture retention strength and tensile properties. Our research demonstrated that the biofunctionalized vascular scaffolds and the directed immobilization of bioactive molecules could provide the necessary elements for successful acellular vascular tissue engineering applications.
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Affiliation(s)
- Jin-Oh Jeong
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, United States
- Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Young Min Ju
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, United States
| | - Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, United States
- Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, United States
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, United States
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, United States
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Kim MK, Jeong W, Kang HW. Liver dECM-Gelatin Composite Bioink for Precise 3D Printing of Highly Functional Liver Tissues. J Funct Biomater 2023; 14:417. [PMID: 37623662 PMCID: PMC10455418 DOI: 10.3390/jfb14080417] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 07/31/2023] [Accepted: 08/04/2023] [Indexed: 08/26/2023] Open
Abstract
In recent studies, liver decellularized extracellular matrix (dECM)-based bioinks have gained significant attention for their excellent compatibility with hepatocytes. However, their low printability limits the fabrication of highly functional liver tissue. In this study, a new liver dECM-gelatin composite bioink (dECM gBioink) was developed to overcome this limitation. The dECM gBioink was prepared by incorporating a viscous gelatin mixture into the liver dECM material. The novel dECM gBioink showed 2.44 and 10.71 times higher bioprinting resolution and compressive modulus, respectively, than a traditional dECM bioink. In addition, the new bioink enabled stable stacking with 20 or more layers, whereas a structure printed with the traditional dECM bioink collapsed. Moreover, the proposed dECM gBioink exhibited excellent hepatocyte and endothelial cell compatibility. At last, the liver lobule mimetic structure was successfully fabricated with a precisely patterned endothelial cell cord-like pattern and primary hepatocytes using the dECM gBioink. The fabricated lobule structure exhibited excellent hepatic functionalities and dose-dependent responses to hepatotoxic drugs. These results demonstrated that the gelatin mixture can significantly improve the printability and mechanical properties of the liver dECM materials while maintaining good cytocompatibility. This novel liver dECM gBioink with enhanced 3D printability and resolution can be used as an advanced tool for engineering highly functional liver tissues.
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Affiliation(s)
| | | | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST 50, UNIST-gil, Ulsan 44919, Republic of Korea; (M.K.K.); (W.J.)
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Son J, Mohamed HJ, Ha W, Naren A, Choi CA, Kwon Y, Park S, Joung HC, Kang HW. Bioprinting of pre-vascularized constructs for enhanced in vivo neo-vascularization. Biofabrication 2023; 15. [PMID: 37011612 DOI: 10.1088/1758-5090/acc9de] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 04/03/2023] [Indexed: 04/05/2023]
Abstract
Pre-vascularization has been receiving significant attention for developing implantable engineered 3D tissues. While various pre-vascularization techniques have been developed to improve graft vascularization, the effect of pre-vascularized patterns on in vivo neo-vessel formation has not been studied. In this study, we developed a functional pre-vascularized construct that significantly promotes graft vascularization and conducted in vivo evaluations of the micro-vascular patterns (µVP) in various printed designs. µVP formation, composed of high-density capillaries, was induced by the co-printing of endothelial cells (EC) and adipose-derived stem cells (ADSC). We implanted the printed constructs with various µVP designs into a murine femoral arteriovenous bundle model and evaluated graft vascularization via 3D visualization and immune-histological analysis of the neo-vessels. The µVP-distal group (µVP located away from the host vessel) showed approximately 2-fold improved neo-vascularization compared to the µVP-proximal group (µVP located near the host vessel). Additionally, we confirmed that the µVP-distal group can generate the angiogenic factor gradient spatial environment for graft vascularization via computational simulations. Based on these results, the ADSC mono pattern (AMP), which secretes four times higher angiogenic factors than µVP, was added to the µVP + AMP group design. The µVP + AMP group showed approximately 1.5- and 1.9-fold higher total sprouted neo-vessel volume than the µVP only and AMP only groups, respectively. In immunohistochemical staining analysis, the µVP + AMP group showed 2-fold improved density and diameter of the matured neo-vessels. To summarize, these findings demonstrate graft vascularization accelerated due to design optimization of our pre-vascularized constructs. We believe that the developed pre-vascularization printing technique will facilitate new possibilities for the upscaling of implantable engineered tissues/organs.
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Affiliation(s)
- Jeonghyun Son
- Department of Biomedical Engineering, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 44919, Korea (the Republic of)
| | - Hanan Jamal Mohamed
- Department of Biomedical Engineering, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Won Ha
- Department of Biomedical Engineering, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Aruzhan Naren
- Department of Biomedical Engineering, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Cham Albert Choi
- MicroCT Applications, Sumyeong-ro 1-gil 11, Gangseo-gu, Seoul, 07644, Korea (the Republic of)
| | - Yoonhee Kwon
- UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Sooah Park
- UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Hong-Chan Joung
- UNIST Optical Bio-med Imaging Center, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, Ulsan, 44919, Korea (the Republic of)
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Myung N, Jin S, Cho HJ, Kang HW. User-designed device with programmable release profile for localized treatment. J Control Release 2022; 352:685-699. [PMID: 36328077 DOI: 10.1016/j.jconrel.2022.10.054] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 10/21/2022] [Accepted: 10/26/2022] [Indexed: 11/11/2022]
Abstract
Three-dimensional printing enables precise and on-demand manufacture of customizable drug delivery systems to advance healthcare toward the goal of personalized medicine. However, major challenges remain in realizing personalized drug delivery that fits a patient-specific drug dosing schedule using local drug delivery systems. In this study, a user-designed device is developed as implantable therapeutics that can realize personalized drug release kinetics by programming the inner structural design on the microscale. The drug release kinetics required for various treatments, including dose-dense therapy and combination therapy, can be implemented by controlling the dosage and combination of drugs along with the rate, duration, initiation time, and time interval of drug release according to the device layer design. After implantation of the capsular device in mice, the in vitro-in vivo and pharmacokinetic evaluation of the device is performed, and the therapeutic effect of the developed device is achieved through the local release of doxorubicin. The developed user-designed device provides a novel platform for developing next-generation drug delivery systems for personalized and localized therapy.
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Affiliation(s)
- Noehyun Myung
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Eonyang-eup, Ulju-gun, 44919 Ulsan, Republic of Korea
| | - Seokha Jin
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Eonyang-eup, Ulju-gun, 44919 Ulsan, Republic of Korea
| | - Hyung Joon Cho
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Eonyang-eup, Ulju-gun, 44919 Ulsan, Republic of Korea.
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Eonyang-eup, Ulju-gun, 44919 Ulsan, Republic of Korea.
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Jung SS, Son J, Yi SJ, Kim K, Park HS, Kang HW, Kim HK. Development of Müller cell-based 3D biomimetic model using bioprinting technology. Biomed Mater 2022; 18. [PMID: 36343367 DOI: 10.1088/1748-605x/aca0d5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 11/07/2022] [Indexed: 11/09/2022]
Abstract
Müller cells are the principal glial cells for the maintenance of structural stability and metabolic homeostasis in the human retina. Although variousin vitroexperiments using two-dimensional (2D) monolayer cell cultures have been performed, the results provided only limited results because of the lack of 3D structural environment and different cellular morphology. We studied a Müller cell-based 3D biomimetic model for use in experiments on thein vivo-like functions of Müller cells within the sensory retina. Isolated primary Müller cells were bioprinted and a 3D-aligned architecture was induced, which aligned Müller cell structure in retinal tissue. The stereographic and functional characteristics of the biomimetic model were investigated and compared to those of the conventional 2D cultured group. The results showed the potential to generate Müller cell-based biomimetic models with characteristic morphological features such as endfeet, soma, and microvilli. Especially, the 3D Müller cell model under hyperglycemic conditions showed similar responses as observed in thein vivodiabetic model with retinal changes, whereas the conventional 2D cultured group showed different cytokine and growth factor secretions. These results show that our study is a first step toward providing advanced tools to investigate thein vivofunction of Müller cells and to develop complete 3D models of the vertebrate retina.
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Affiliation(s)
- Sung Suk Jung
- Animal and Plant Quarantine Agency, 177 Hyeoksin 8-ro, Gimcheon City, Gyeongsangbuk-do 39660, Republic of Korea
| | - Jeonghyun Son
- Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulju-gun, Ulsan 44919, Republic of Korea
| | - Soo Jin Yi
- Department of Ophthalmology, School of Medicine, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea.,Bio-Medical Institute, Kyungpook National University Hospital, 130 Dongdeok-ro, Jung-gu, Daegu 41944, Republic of Korea.,Department of Biomedical Science, The Graduate School, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea
| | - Kyungha Kim
- Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulju-gun, Ulsan 44919, Republic of Korea
| | - Han Sang Park
- Department of Ophthalmology, School of Medicine, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea
| | - Hyun-Wook Kang
- Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulju-gun, Ulsan 44919, Republic of Korea
| | - Hong Kyun Kim
- Department of Ophthalmology, School of Medicine, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea.,Bio-Medical Institute, Kyungpook National University Hospital, 130 Dongdeok-ro, Jung-gu, Daegu 41944, Republic of Korea.,Department of Biomedical Science, The Graduate School, Kyungpook National University, 680 Gukchaebosang-ro, Jung-gu, Daegu 41944, Republic of Korea
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11
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Han J, Jeon S, Kim MK, Jeong W, Yoo JJ, Kang HW. In vitrobreast cancer model with patient-specific morphological features for personalized medicine. Biofabrication 2022; 14. [PMID: 35334470 DOI: 10.1088/1758-5090/ac6127] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [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: 10/21/2021] [Accepted: 03/25/2022] [Indexed: 11/11/2022]
Abstract
In vitro cancer models that can simulate patient-specific drug responses for personalized medicine have attracted significant attention. However, the technologies used to produce such models can only recapitulate the morphological heterogeneity of human cancer tissue. Here, we developed a novel 3D technique to bioprint an in vitro breast cancer model with patient-specific morphological features. This model can precisely mimic the cellular microstructures of heterogeneous cancer tissues and produce drug responses similar to those of human cancers. We established a bioprinting process for generating cancer cell aggregates with ductal and solid tissue microstructures that reflected the morphology of breast cancer tissues, and applied it to develop breast cancer models. The genotypic and phenotypic characteristics of the ductal and solid cancer aggregates bioprinted with human breast cancer cells (MCF7, SKBR3, MDA-MB-231) were respectively similar to those of early and advanced cancers. The bioprinted solid cancer cell aggregates showed significantly higher hypoxia (>8 times) and mesenchymal (>2-4 times) marker expressions, invasion activity (>15 times), and drug resistance than the bioprinted ductal aggregates. Co-printing the ductal and solid aggregates produced heterogeneous breast cancer tissue models that recapitulated three different stages of breast cancer tissue morphology. The bioprinted cancer tissue models representing advanced cancer were more and less resistant, respectively, to the anthracycline antibiotic doxorubicin and the hypoxia-activated prodrug tirapazamine; these were analogous to the results in human cancer. The present findings showed that cancer cell aggregates can mimic the pathological micromorphology of human breast cancer tissue and they can be bioprinted to produce breast cancer tissue in vitro that can morphologically represent the clinical stage of cancer in individual patients.
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Affiliation(s)
- Jonghyeuk Han
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Seunggyu Jeon
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Min Kyeong Kim
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - Wonwoo Jeong
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, Ulsan, 44919, Korea (the Republic of)
| | - James J Yoo
- Regenerative Medicine, Wake Forest University, Medical Center Boulevard, NC 27157-1093, USA, Winston-Salem, North Carolina, 27109, UNITED STATES
| | - Hyun-Wook Kang
- School of Life Sciences, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Ulsan, 44919, Korea (the Republic of)
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12
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Kim SG, You D, Kim K, Aum J, Kim YS, Jang MJ, Moon KH, Kang HW. Therapeutic Effect of Human Mesenchymal Stem Cell-Conditioned Medium on Erectile Dysfunction. World J Mens Health 2021; 40:653-662. [PMID: 35021313 PMCID: PMC9482857 DOI: 10.5534/wjmh.210121] [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: 07/20/2021] [Revised: 09/27/2021] [Accepted: 10/01/2021] [Indexed: 11/26/2022] Open
Abstract
Purpose Owing to the safety and cost effectiveness of conditioned medium (CM), its therapeutic effects have attracted significant attention from many researchers. To date, numerous studies have been conducted on CM; however, little has been done with regard to erectile dysfunction (ED). In this research, the potential of human mesenchymal stem cell-derived CM (MSC-CM) for the treatment of ED was investigated. Materials and Methods A high concentration of MSC-CM was prepared through 3D spheroid culturing with bone marrow-derived MSCs and cut-off filtering. The composition of CM was analyzed using biochemical assays, and the effect of the preparation process on the quality of CM was investigated. The therapeutic effects of MSC-CM were evaluated through animal studies using a cavernous nerve (CN) injury rat model. Results 3D spheroid culturing afforded a 278-fold increase in the total protein content of CM, as compared to that from 2D cultures; the protein concentration increased by 19 times on increasing the centrifugation time for cut-off filtering. Biochemical assays indicated that the CM contains various xlink:types of angiogenic, neurotrophic, and anti-inflammatory factors. Histological assay results showed that MSC-CM has angio- and neuro-trophic effect in a CN injury rat model in vivo, and these therapeutic effects appear in a dose-dependent manner. Conclusions The experimental results confirmed the therapeutic effect of MSC-CM in healing damaged cavernosal tissue and restoring erectile function. These results successfully demonstrated that MSC-CM has significant potential for the treatment of ED.
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Affiliation(s)
- Seul Gi Kim
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Dalsan You
- Department of Urology, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Korea
| | - Kyung Kim
- Department of Urology, Asan Medical Center, University of Ulsan College of Medicine, Korea
| | - Joomin Aum
- Department of Urology, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Korea
| | - Yu Seon Kim
- Department of Urology, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Korea
| | - Myoung Jin Jang
- Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea
| | - Kyung Hyun Moon
- Department of Urology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Korea.
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13
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Doherty C, McKenna R, Kang HW, Gibson D, Hanratty B, Wong-Chung J. 1357 Ankle Blocks: Improving Day Case Efficiency. Br J Surg 2021. [DOI: 10.1093/bjs/znab259.1049] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Introduction
The COVID pandemic has exerted unprecedented pressure on hospital resources. Resulting in cancellation of elective operative services, increased patient waiting lists, limited surgical training opportunities along with reduced availability of staff, theatre, and in-patient bed capacity. A novel approach for day case forefoot surgery under ankle block, to mitigate the pandemic service limitations without compromising care, was developed.
Method
This is a 3-month, multi-centre, prospective cohort study evaluating the novel ankle block day case forefoot surgery pathway. Patients had a minimum of three months clinical follow up with outcome scores. They were matched to a cohort undergoing similar surgery prior to the COVID pandemic.
Results
The utilisation of an ankle block pathway resulted in an average reduction of inpatient stay by 2 days per patient. Over the study period conservative savings of £26,659 were calculated. Anecdotally we observed a reduction in morbidity (wound complications, SSI’s) although not statistically significant.
Conclusions
Our novel surgical pathway has enabled continued elective operating for procedures that previously required hospital admission during a period of severe restrictions within the NHS. We observed significant reductions in cost, surgical inpatient bed utilisation and total operative time with staff, resource, and time savings. We hypothesise that prehabilitation with physiotherapy, ankle instead of thigh tourniquets and early mobilisation may have contributed to improved morbidity scores. The findings of this project have implications for training, upper limb services and are transferrable as a template to improve service efficiency while maintaining high quality care.
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Affiliation(s)
- C Doherty
- Altnagelvin Hospital, Derry, United Kingdom
| | - R McKenna
- Altnagelvin Hospital, Derry, United Kingdom
| | - H W Kang
- Altnagelvin Hospital, Derry, United Kingdom
| | - D Gibson
- Altnagelvin Hospital, Derry, United Kingdom
| | - B Hanratty
- Altnagelvin Hospital, Derry, United Kingdom
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14
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Son J, Hong SJ, Lim JW, Jeong W, Jeong JH, Kang HW. Engineering Tissue-Specific, Multiscale Microvasculature with a Capillary Network for Prevascularized Tissue. Small Methods 2021; 5:e2100632. [PMID: 34927948 DOI: 10.1002/smtd.202100632] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 07/24/2021] [Indexed: 06/14/2023]
Abstract
Although there are various pre-existing technologies for engineering vasculatures, multiscale modeling of the architecture of human vasculature at a capillary scale remains a challenge. In this study, a novel technology is developed for the production of a functional, multiscale microvasculature comprising of endothelialized channels and tissue-specific capillary networks. Perfusable, endothelialized channels are bioprinted, after which angiogenic sprouts are grown into user-designed capillary networks. The induction of branched and liver-lobule-like capillary networks confirm that the technology can produce various types of tissue-specific multiscale microvasculatures. Further, the channels and capillaries are deemed to be functional when evaluated in vitro. An ex vivo assay demonstrates that the microvasculature can induce neovessel ingrowth, integrate with host vessels, and facilitate blood flow. Remarkably, blood flows through the implanted capillary network without any change in its morphology. Finally, the technology is applied to produce a vascularized liver tissue; it significantly improves its hepatic function. It is believed that this new technology will create new possibilities in the development of highly vascularized and functional tissues/organs on a clinically relevant scale.
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Affiliation(s)
- Jeonghyun Son
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Sung Joon Hong
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Jun Woo Lim
- Department of Chemical Engineering, Soongsil University, Seoul, 06978, Republic of Korea
| | - Wonwoo Jeong
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Jae Hyun Jeong
- Department of Chemical Engineering, Soongsil University, Seoul, 06978, Republic of Korea
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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15
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Jeong W, Kim MK, Kang HW. Effect of detergent type on the performance of liver decellularized extracellular matrix-based bio-inks. J Tissue Eng 2021; 12:2041731421997091. [PMID: 33717429 PMCID: PMC7919203 DOI: 10.1177/2041731421997091] [Citation(s) in RCA: 9] [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: 02/03/2021] [Accepted: 02/03/2021] [Indexed: 01/05/2023] Open
Abstract
Decellularized extracellular matrix-based bio-inks (dECM bio-inks) for
bioprinting technology have recently gained attention owing to their excellent
ability to confer tissue-specific functions and 3D-printing capability. Although
decellularization has led to a major advancement in bio-ink development, the
effects of detergent type, the most important factor in decellularization, are
still unclear. In this study, the effects of various detergent types on bio-ink
performance were investigated. Porcine liver-derived dECM bio-inks prepared
using widely used detergents, including sodium dodecyl sulfate (SDS), sodium
deoxycholate (SDC), Triton X-100 (TX), and TX with ammonium hydroxide (TXA),
were characterized in detail. SDS and SDC severely damaged glycosaminoglycan and
elastin proteins, TX showed the lowest rate of decellularization, and TXA-based
dECM bio-ink possessed the highest ECM content among all bio-inks. Differences
in biochemical composition directly affected bio-ink performance, with TXA-dECM
bio-ink showing the best performance with respect to gelation kinetics,
intermolecular bonding, mechanical properties, and 2D/3D printability. More
importantly, cytocompatibility tests using primary mouse hepatocytes also showed
that the TXA-dECM bio-ink improved albumin secretion and cytochrome P450
activity by approximately 2.12- and 1.67-fold, respectively, compared with the
observed values for other bio-inks. Our results indicate that the detergent type
has a great influence on dECM damage and that the higher the dECM content, the
better the performance of the bio-ink for 3D bioprinting.
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Affiliation(s)
- Wonwoo Jeong
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | - Min Kyeong Kim
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
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16
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Kim MK, Jeong W, Lee SM, Kim JB, Jin S, Kang HW. Decellularized extracellular matrix-based bio-ink with enhanced 3D printability and mechanical properties. Biofabrication 2020; 12:025003. [DOI: 10.1088/1758-5090/ab5d80] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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17
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Ahn CB, Lee JH, Han DG, Kang HW, Lee SH, Lee JI, Son KH, Lee JW. Simulated microgravity with floating environment promotes migration of non-small cell lung cancers. Sci Rep 2019; 9:14553. [PMID: 31601869 PMCID: PMC6787256 DOI: 10.1038/s41598-019-50736-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [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: 04/17/2019] [Accepted: 09/06/2019] [Indexed: 11/09/2022] Open
Abstract
A migration of cancer is one of the most important factors affecting cancer therapy. Particularly, a cancer migration study in a microgravity environment has gained attention as a tool for developing cancer therapy. In this study, we evaluated the proliferation and migration of two types (adenocarcinoma A549, squamous cell carcinoma H1703) of non-small cell lung cancers (NSCLC) in a floating environment with microgravity. When we measured proliferation of two NSCLCs in the microgravity (MG) and ground-gravity (CONT), although initial cell adhesion in MG was low, a normalized proliferation rate of A549 in MG was higher than that in CONT. Wound healing results of A549 and H1703 showed rapid recovery in MG; particularly, the migration rate of A549 was faster than that of H1703 both the normal and low proliferating conditions. Gene expression results showed that the microgravity accelerated the migration of NSCLC. Both A549 and H1703 in MG highly expressed the migration-related genes MMP-2, MMP-9, TIMP-1, and TIMP-2 compared to CONT at 24 h. Furthermore, analysis of MMP-2 protein synthesis revealed weaker metastatic performance of H1703 than that of A549. Therefore, the simulated microgravity based cancer culture environment will be a potential for migration and metastasis studies of lung cancers.
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Affiliation(s)
- Chi Bum Ahn
- Department of Molecular Medicine, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Ji-Hyun Lee
- Department of Molecular Medicine, College of Medicine, Gachon University, Incheon, Republic of Korea
| | - Dae Geun Han
- Department of Health Sciences and Technology, GAIHST, Gachon University, Incheon, Republic of Korea
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Sung-Ho Lee
- Department of Thoracic and Cardiovascular Surgery, Korea University Medical College, Korea University, Seoul, Republic of Korea
| | - Jae-Ik Lee
- Department of Thoracic and Cardiovascular Surgery, Gachon University Gil Medical Center, School of Medicine, Gachon University, Incheon, Republic of Korea
| | - Kuk Hui Son
- Department of Thoracic and Cardiovascular Surgery, Gachon University Gil Medical Center, School of Medicine, Gachon University, Incheon, Republic of Korea.
| | - Jin Woo Lee
- Department of Molecular Medicine, College of Medicine, Gachon University, Incheon, Republic of Korea. .,Department of Health Sciences and Technology, GAIHST, Gachon University, Incheon, Republic of Korea.
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18
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Kang HW, Kim WY, Jin SJ, Kim YH, Min TJ, Lee YS, Kim JH. Clinical evaluation of anesthesia for high-risk cesarean section at a tertiary medical center: retrospective study for 8 years (2009-2016). J Int Med Res 2019; 47:4365-4373. [PMID: 31331228 PMCID: PMC6753575 DOI: 10.1177/0300060519859749] [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] [Indexed: 11/16/2022] Open
Abstract
Objective The number of high-risk pregnancies is increasing in tertiary medical centers. Therefore, we investigated perioperative outcomes based on risk factors to ascertain proper maternal and neonatal management. Methods We reviewed the medical records of patients receiving cesarean sections over an 8-year period. Clinical parameters for anesthesia and the neonatal outcome were compared among high-risk groups after subdivision by the number of clinical risk factors. The groups were as follows: group A (one risk factor), group B (two risk factors), and group C (three or more risk factors). Results Patient age, estimated blood loss (EBL), and volume of transfused red blood cell (RBC) were higher in group B than group A. Birth weight, 1- and 5-minute Apgar scores, and gestational age were lower while the frequency of neonatal intensive care unit (NICU) admission was higher in group B than group A. Group C patients were significantly older than group A or B patients. Birth weight, 1- and 5-minute Apgar scores and gestational age were significantly lower while frequency of NICU admission was higher in group C than group A and B. Conclusion The number of maternal risk factors was positively associated with adverse outcomes in the neonates.
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Affiliation(s)
- H W Kang
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
| | - W Y Kim
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
| | - S J Jin
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
| | - Y H Kim
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
| | - T J Min
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
| | - Y S Lee
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
| | - J H Kim
- Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Gyeonggi-do, Republic of Korea
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Shin JH, Heo JH, Jeon S, Park JH, Kim S, Kang HW. Bio-inspired hollow PDMS sponge for enhanced oil-water separation. J Hazard Mater 2019; 365:494-501. [PMID: 30466047 DOI: 10.1016/j.jhazmat.2018.10.078] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 10/22/2018] [Accepted: 10/25/2018] [Indexed: 05/08/2023]
Abstract
Oil spills from disasters such as the sinking of ships and the discharge of oily wastes cause serious environmental problems. Polydimethylsiloxane(PDMS) sponges are valuable tools for isolating spilled oil. Here, we propose new PDMS sponges with bio-inspired design and enhanced absorption capacities. 3D printing was used to produce templates having negative designs, and after being filled with PDMS, the templates were selectively dissolved. Through this, PDMS sponges with well-interconnected and controlled porosities were produced within 10% error. The wettability of sponges with various pore sizes and line widths was investigated. The surfaces were found to be highly hydrophobic, with water contact angles of 100-143°, and oleophilic, with oil contact angles of ∼0°. The sponge fabricated with line width of 200 μm and pore size of 400 μm showed the highest hydrophobicity and oleophilicity. These parameters were used to produce the surfaces of hollow sponges having bio-inspired design that mimics the water absorption and storage functions of cactus. Repeated oil-water separation testing was conducted, and the absorption capacities were compared with those of non-hollow and conventional sponges. The new design showed absorption capacity up to 3.7 times that of the sponges. The bio-inspired PDMS sponge provides a significant advance in oil-water separation ability.
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Affiliation(s)
- Jung Hwal Shin
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan, 44919, South Korea; School of Mechanical Engineering, Kyungnam University, 7 Kyungnamdaehak-ro, Masanhappo-gu, Changwon, Gyeongsangnam-do, 51767, South Korea
| | - Jun-Ho Heo
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan, 44919, South Korea
| | - Seunggyu Jeon
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan, 44919, South Korea
| | - Jeong Hun Park
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Room 2233, Atlanta, GA, 30332, USA
| | - Suhyeon Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 37673, South Korea
| | - Hyun-Wook Kang
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan, 44919, South Korea.
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20
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Shin JH, Kim K, Woo H, Kang IS, Kang HW, Choi W, Lim G. One-directional flow of ionic solutions along fine electrodes under an alternating current electric field. R Soc Open Sci 2019; 6:180657. [PMID: 30891253 PMCID: PMC6408404 DOI: 10.1098/rsos.180657] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 01/11/2019] [Indexed: 06/09/2023]
Abstract
Electric fields are widely used for controlling liquids in various research fields. To control a liquid, an alternating current (AC) electric field can offer unique advantages over a direct current (DC) electric field, such as fast and programmable flows and reduced side effects, namely the generation of gas bubbles. Here, we demonstrate one-directional flow along carbon nanotube nanowires under an AC electric field, with no additional equipment or frequency matching. This phenomenon has the following characteristics: First, the flow rates of the transported liquid were changed by altering the frequency showing Gaussian behaviour. Second, a particular frequency generated maximum liquid flow. Third, flow rates with an AC electric field (approximately nanolitre per minute) were much faster than those of a DC electric field (approximately picolitre per minute). Fourth, the flow rates could be controlled by changing the applied voltage, frequency, ion concentration of the solution and offset voltage. Our finding of microfluidic control using an AC electric field could provide a new method for controlling liquids in various research fields.
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Affiliation(s)
- Jung Hwal Shin
- School of Mechanical Engineering, Kyungnam University, 7 Kyungnamdaehak-ro, Masanhappo-gu, Changwon, Gyeongsangnam-do 51767, South Korea
| | - Kanghyun Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), San31, Hyoja-dong, Pohang, Gyeongsangbuk-do 790-784, South Korea
| | - Hyeonsu Woo
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), San31, Hyoja-dong, Pohang, Gyeongsangbuk-do 790-784, South Korea
| | - In Seok Kang
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San31, Hyoja-dong, Pohang, Gyeongsangbuk-do 790-784, South Korea
| | - Hyun-Wook Kang
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, South Korea
| | - WooSeok Choi
- Department of Mechanical Engineering, Korea National University of Transportation, 50 Daehak-Ro, Chungju, Chungcheongbuk-do 380-702, South Korea
| | - Geunbae Lim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), San31, Hyoja-dong, Pohang, Gyeongsangbuk-do 790-784, South Korea
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Han J, Kim DS, Jang H, Kim HR, Kang HW. Bioprinting of three-dimensional dentin-pulp complex with local differentiation of human dental pulp stem cells. J Tissue Eng 2019; 10:2041731419845849. [PMID: 31205671 PMCID: PMC6535759 DOI: 10.1177/2041731419845849] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 04/02/2019] [Indexed: 01/16/2023] Open
Abstract
Numerous approaches have been introduced to regenerate artificial dental tissues. However, conventional approaches are limited when producing a construct with three-dimensional patient-specific shapes and compositions of heterogeneous dental tissue. In this research, bioprinting technology was applied to produce a three-dimensional dentin-pulp complex with patient-specific shapes by inducing localized differentiation of human dental pulp stem cells within a single structure. A fibrin-based bio-ink was designed for bioprinting with the human dental pulp stem cells. The effects of fibrinogen concentration within the bio-ink were investigated in terms of printability, human dental pulp stem cell compatibility, and differentiation. The results show that micro-patterns with human dental pulp stem cells could be achieved with more than 88% viability. Its odontogenic differentiation was also regulated according to the fibrinogen concentration. Based on these results, a dentin-pulp complex having patient-specific shape was produced by co-printing the human dental pulp stem cell-laden bio-inks with polycaprolactone, which is a bio-thermoplastic used for producing the overall shape. After culturing with differentiation medium for 15 days, localized differentiation of human dental pulp stem cells in the outer region of the three-dimensional cellular construct was successfully achieved with localized mineralization. This result demonstrates the possibility to produce patient-specific composite tissues for tooth tissue engineering using three-dimensional bioprinting technology.
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Affiliation(s)
- Jonghyeuk Han
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | - Da Sol Kim
- Department of Oral Biochemistry, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Ho Jang
- Department of Oral Biochemistry, School of Dentistry, Pusan National University, Yangsan, South Korea
- Institute of Translational Dental Sciences, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Hyung-Ryong Kim
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan, South Korea
- College of Dentistry, Dankook University, Cheonan, South Korea
| | - Hyun-Wook Kang
- Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
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22
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Kim JH, Seol YJ, Ko IK, Kang HW, Lee YK, Yoo JJ, Atala A, Lee SJ. 3D Bioprinted Human Skeletal Muscle Constructs for Muscle Function Restoration. Sci Rep 2018; 8:12307. [PMID: 30120282 PMCID: PMC6098064 DOI: 10.1038/s41598-018-29968-5] [Citation(s) in RCA: 123] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 07/20/2018] [Indexed: 12/31/2022] Open
Abstract
A bioengineered skeletal muscle tissue as an alternative for autologous tissue flaps, which mimics the structural and functional characteristics of the native tissue, is needed for reconstructive surgery. Rapid progress in the cell-based tissue engineering principle has enabled in vitro creation of cellularized muscle-like constructs; however, the current fabrication methods are still limited to build a three-dimensional (3D) muscle construct with a highly viable, organized cellular structure with the potential for a future human trial. Here, we applied 3D bioprinting strategy to fabricate an implantable, bioengineered skeletal muscle tissue composed of human primary muscle progenitor cells (hMPCs). The bioprinted skeletal muscle tissue showed a highly organized multi-layered muscle bundle made by viable, densely packed, and aligned myofiber-like structures. Our in vivo study presented that the bioprinted muscle constructs reached 82% of functional recovery in a rodent model of tibialis anterior (TA) muscle defect at 8 weeks of post-implantation. In addition, histological and immunohistological examinations indicated that the bioprinted muscle constructs were well integrated with host vascular and neural networks. We demonstrated the potential of the use of the 3D bioprinted skeletal muscle with a spatially organized structure that can reconstruct the extensive muscle defects.
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Affiliation(s)
- Ji Hyun Kim
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
| | - Young-Joon Seol
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
| | - In Kap Ko
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
| | - Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
| | - Young Koo Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
- Department of Orthopedic Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Gyeonggi-Do, 420-726, Republic of Korea
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, 27157, United States
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, 27157, United States
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, United States.
- School of Biomedical Engineering and Sciences, Wake Forest University-Virginia Tech, Winston-Salem, NC, 27157, United States.
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23
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Shi G, Yoon T, Cha S, Kim S, Yousuf M, Ahmed N, Kim D, Kang HW, Kim KS. Turn-on and Turn-off Fluorescent Probes for Carbon Monoxide Detection and Blood Carboxyhemoglobin Determination. ACS Sens 2018; 3:1102-1108. [PMID: 29767518 DOI: 10.1021/acssensors.8b00083] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Water-soluble, carbazole-based two-photon excitable fluorescent probes MPVC-I ("turn-on") and MPVC-II ("turn-off") are rationally designed and synthesized for the selective monitoring of carbon monoxide (CO). Both probes can effectively measure carboxyhemoglobin (HbCO) in the blood of the animals exposed to a CO dose as low as 100 ppm for 10 min. The palladium catalyzed azidocarbonylation reaction was optimized to improve the sensing efficiency.
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Affiliation(s)
- Genggongwo Shi
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Taeseung Yoon
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Seoncheol Cha
- Department of Physics, Sogang University, Seoul 04107, Korea
| | - Seulgi Kim
- Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Muhammad Yousuf
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Nisar Ahmed
- School of Chemistry, Cardiff University, Park Place, main building, Cardiff CF10 3AT, United Kingdom
| | - Doseok Kim
- Department of Physics, Sogang University, Seoul 04107, Korea
| | - Hyun-Wook Kang
- Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Kwang S. Kim
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
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24
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Kang D, Ahn G, Kim D, Kang HW, Yun S, Yun WS, Shim JH, Jin S. Pre-set extrusion bioprinting for multiscale heterogeneous tissue structure fabrication. Biofabrication 2018; 10:035008. [DOI: 10.1088/1758-5090/aac70b] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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25
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Kang HW, Park M, Wallace (Hernandez) JP. The impact of perceived social support, loneliness, and physical activity on quality of life in South Korean older adults. J Sport Health Sci 2018; 7:237-244. [PMID: 30356448 PMCID: PMC6180534 DOI: 10.1016/j.jshs.2016.05.003] [Citation(s) in RCA: 50] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 11/14/2015] [Accepted: 01/28/2016] [Indexed: 06/08/2023]
Abstract
PURPOSE The purpose of this study was to propose and test a conceptual model that explains the interrelationships among perceived social support, loneliness, physical activity (PA), and quality of life (QoL) among active older adults in South Korea. METHODS Data were collected from 332 individuals over the age of 65 using a systematic stratified convenience sampling method. Survey data were collected and analyzed using a structural equation model (SEM). RESULTS Perceived social support had a significantly positive effect on PA (β = 0.14, p < 0.01) and QoL (β = 0.28, p < 0.001) while decreasing loneliness (β = -0.55, p < 0.001). PA had a significant positive effect on QoL (β = 0.12, p < 0.01), and loneliness had a negative effect on QoL (β = -0.37, p < 0.001). Loneliness mediated the relationship between perceived social support and QoL. CONCLUSION The SEM results of the current study support the proposed model that explained the interrelationships among perceived social support, loneliness, PA, and QoL among active older adults in South Korea. These findings suggest the importance of incorporating social support mechanisms for PA interventions in order to enhance QoL. The findings of this study can help create more effective health and physical education programs for the older generations in South Korea to enhance their QoL.
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Affiliation(s)
- Hyun-Wook Kang
- Department of Recreational Sports, Dankook University, Cheonan-si 330-714, Republic of Korea
| | - Meungguk Park
- Department of Kinesiology, Southern Illinois University, Carbondale, IL 62901-4310, USA
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26
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Kang HW. Factors Influencing Insufficient Physical Activity in Community-dwelling Elderly Individuals with Dementia: Using a 2014 Survey of Living Conditions of Elderly Individuals. ACTA ACUST UNITED AC 2018. [DOI: 10.12811/kshsm.2018.12.1.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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27
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Cho KT, Lee SC, Lee HJ, Kang HW. Acute Abdomen in a Cervical Spinal Cord Injury Patient: A Case Report and Review of the Literature. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791302000309] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Acute abdomen, including appendicitis, is an emergent condition requiring early detection and, often, immediate surgical intervention. Although patients with spinal cord injury (SCI) have an incidence of acute abdomen similar to that of the general population, diagnosing them is even more difficult and complex than it is in the general population. Because of the disruption of normal sensory pathways, the early symptoms are subtle and physical examination of the abdomen is often not helpful. In addition, because of concomitant common conditions in SCI patients, such as urinary tract infection, atelectasis, pneumonia, and decubitus ulcer, laboratory results are not reliable. Delayed diagnoses lead to higher mortality rates among SCI patients with acute abdomen than those of the general population. We report a case of appendicitis in a patient with cervical SCI and discuss the clinical characteristics and diagnostic pitfalls of acute abdomen in SCI patients.
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Affiliation(s)
| | - SC Lee
- Dongguk University Ilsan Hospital & Dongguk University, Department of Emergency Medicine, 814 Siksa-dong, Ilsandong-gu, Goyang-si, Gyeonggi-do, 410-773, Korea
| | - HJ Lee
- Dongguk University Ilsan Hospital & Dongguk University, Department of Emergency Medicine, 814 Siksa-dong, Ilsandong-gu, Goyang-si, Gyeonggi-do, 410-773, Korea
| | - HW Kang
- Dongguk University Ilsan Hospital & Dongguk University, Department of Emergency Medicine, 814 Siksa-dong, Ilsandong-gu, Goyang-si, Gyeonggi-do, 410-773, Korea
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28
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Skardal A, Murphy SV, Devarasetty M, Mead I, Kang HW, Seol YJ, Shrike Zhang Y, Shin SR, Zhao L, Aleman J, Hall AR, Shupe TD, Kleensang A, Dokmeci MR, Jin Lee S, Jackson JD, Yoo JJ, Hartung T, Khademhosseini A, Soker S, Bishop CE, Atala A. Multi-tissue interactions in an integrated three-tissue organ-on-a-chip platform. Sci Rep 2017; 7:8837. [PMID: 28821762 PMCID: PMC5562747 DOI: 10.1038/s41598-017-08879-x] [Citation(s) in RCA: 313] [Impact Index Per Article: 44.7] [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: 04/03/2017] [Accepted: 07/14/2017] [Indexed: 01/01/2023] Open
Abstract
Many drugs have progressed through preclinical and clinical trials and have been available - for years in some cases - before being recalled by the FDA for unanticipated toxicity in humans. One reason for such poor translation from drug candidate to successful use is a lack of model systems that accurately recapitulate normal tissue function of human organs and their response to drug compounds. Moreover, tissues in the body do not exist in isolation, but reside in a highly integrated and dynamically interactive environment, in which actions in one tissue can affect other downstream tissues. Few engineered model systems, including the growing variety of organoid and organ-on-a-chip platforms, have so far reflected the interactive nature of the human body. To address this challenge, we have developed an assortment of bioengineered tissue organoids and tissue constructs that are integrated in a closed circulatory perfusion system, facilitating inter-organ responses. We describe a three-tissue organ-on-a-chip system, comprised of liver, heart, and lung, and highlight examples of inter-organ responses to drug administration. We observe drug responses that depend on inter-tissue interaction, illustrating the value of multiple tissue integration for in vitro study of both the efficacy of and side effects associated with candidate drugs.
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Affiliation(s)
- Aleksander Skardal
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA. .,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA.
| | - Sean V Murphy
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Mahesh Devarasetty
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Ivy Mead
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Young-Joon Seol
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Yu Shrike Zhang
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA, 02139, USA
| | - Su-Ryon Shin
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA, 02139, USA
| | - Liang Zhao
- Center for Alternatives to Animal Testing (CAAT), Bloomberg School of Public Health, Johns Hopkins University Baltimore, 615N Wolfe Street, Baltimore, MD, USA
| | - Julio Aleman
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.,Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA, 02139, USA
| | - Adam R Hall
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Thomas D Shupe
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Andre Kleensang
- Center for Alternatives to Animal Testing (CAAT), Bloomberg School of Public Health, Johns Hopkins University Baltimore, 615N Wolfe Street, Baltimore, MD, USA
| | - Mehmet R Dokmeci
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA, 02139, USA
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - John D Jackson
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Thomas Hartung
- Center for Alternatives to Animal Testing (CAAT), Bloomberg School of Public Health, Johns Hopkins University Baltimore, 615N Wolfe Street, Baltimore, MD, USA.,Steinbeis CAAT-Europe, University of Konstanz, Universitätstr 10, Konstanz, Baden-Württemberg, Germany
| | - Ali Khademhosseini
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02139, USA.,Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA, 02139, USA.,Department of Bioindustrial Technologies, College of Animal Bioscience and Technology, Konkuk University, Seoul, 143-701, Republic of Korea.,Department of Physics, King Abdulaziz University, Jeddah, 21569, Saudi Arabia
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Colin E Bishop
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA. .,Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA.
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29
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Kim JH, Seol YJ, Ko IK, Kang HW, Jackson J, Lee SJ, Yoo J, Atala A. Three-Dimensional Bioprinting of Muscle Constructs for Reconstruction. J Am Coll Surg 2016. [DOI: 10.1016/j.jamcollsurg.2016.08.479] [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: 11/29/2022]
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30
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Kang HW, Oh HJ, Park HY, Park CK, Shin HJ, Lim JH, Kwon YS, Oh IJ, Choi YD. Endobronchial amyloidosis mimicking bronchial asthma: a case report and review of the literature. Open Med (Wars) 2016; 11:174-177. [PMID: 28352789 PMCID: PMC5329820 DOI: 10.1515/med-2016-0033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 03/19/2016] [Indexed: 11/15/2022] Open
Abstract
Among two tracheobronchial forms (local and diffuse) and two parenchymal forms (nodular and alveolar septal) that were reported in previous literature, localized endobronchial amyloidosis is an uncommon disease of unknown cause. Bronchial amyloid deposits can occur as focal nodules or multifocal infiltration of the submucosa. We report the case of a 47-year-old man who had complained of dyspnea and wheezing for 1 month and who had been treated for severe asthma at another hospital. Endobronchial amyloidosis was confirmed by histological examination of the bronchial biopsies.
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Affiliation(s)
- Hyun-Wook Kang
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
| | - Hyung-Joo Oh
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
| | - Ha Young Park
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
| | - Cheol-Kyu Park
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of) , Tel. +82-61-379-7617, Fax +82-61-379-7619
| | - Hong-Joon Shin
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
| | - Jung-Hwan Lim
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
| | - Yong-Soo Kwon
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
| | - In-Jae Oh
- Department of Internal Medicine, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of) , Tel. +82-61-379-7617, Fax +82-61-379-7619
| | - Yoo-Duk Choi
- Department of Pathology, Chonnam National University Medical School, 671 Jebong-ro, Dong-gu, Gwangju, 501-757, Korea (Republic of)
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31
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Hwang JY, Lee J, Oh CK, Kang HW, Hwang IY, Um JW, Park HC, Kim S, Shin JH, Park WY, Darnell RB, Um HD, Chung KC, Kim K, Oh YJ. Proteolytic degradation and potential role of onconeural protein cdr2 in neurodegeneration. Cell Death Dis 2016; 7:e2240. [PMID: 27253404 PMCID: PMC5143381 DOI: 10.1038/cddis.2016.151] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 02/25/2016] [Revised: 04/21/2016] [Accepted: 05/05/2016] [Indexed: 12/11/2022]
Abstract
Cerebellar degeneration-related protein 2 (cdr2) is expressed in the central nervous system, and its ectopic expression in tumor cells of patients with gynecological malignancies elicits immune responses by cdr2-specific autoantibodies and T lymphocytes, leading to neurological symptoms. However, little is known about the regulation and function of cdr2 in neurodegenerative diseases. Because we found that cdr2 is highly expressed in the midbrain, we investigated the role of cdr2 in experimental models of Parkinson's disease (PD). We found that cdr2 levels were significantly reduced after stereotaxic injection of 1-methyl-4-phenylpyridinium (MPP(+)) into the striatum. cdr2 levels were also decreased in the brains of post-mortem PD patients. Using primary cultures of mesencephalic neurons and MN9D cells, we confirmed that MPP(+) reduces cdr2 in tyrosine hydroxylase-positive dopaminergic neuronal cells. The MPP(+)-induced decrease of cdr2 was primarily caused by calpain- and ubiquitin proteasome system-mediated degradation, and cotreatment with pharmacological inhibitors of these enzymes or overexpression of calcium-binding protein rendered cells less vulnerable to MPP(+)-mediated cytotoxicity. Consequently, overexpression of cdr2 rescued cells from MPP(+)-induced cytotoxicity, whereas knockdown of cdr2 accelerated toxicity. Collectively, our findings provide insights into the novel regulatory mechanism and potentially protective role of onconeural protein during dopaminergic neurodegeneration.
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Affiliation(s)
- J-Y Hwang
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea.,Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - J Lee
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
| | - C-K Oh
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
| | - H W Kang
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
| | - I-Y Hwang
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
| | - J W Um
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
| | - H C Park
- Graduate School of Medicine, Korea University, Ansan 425-707, Gyeonggi-do, Korea
| | - S Kim
- Graduate School of Medicine, Korea University, Ansan 425-707, Gyeonggi-do, Korea
| | - J-H Shin
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Gyeonggi-do, Korea
| | - W-Y Park
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Gyeonggi-do, Korea
| | - R B Darnell
- Laboratory of Molecular Neuro-Oncology, Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10065, USA
| | - H-D Um
- Division of Radiation Cancer Biology, Korean Institute of Radiological & Medical Sciences, Seoul 01812, Korea
| | - K C Chung
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
| | - K Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Korea
| | - Y J Oh
- Department of Systems Biology, Yonsei University College of Life Science and Biotechnology, Seoul 120-749, Korea
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32
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Skardal A, Devarasetty M, Kang HW, Seol YJ, Forsythe SD, Bishop C, Shupe T, Soker S, Atala A. Bioprinting Cellularized Constructs Using a Tissue-specific Hydrogel Bioink. J Vis Exp 2016:e53606. [PMID: 27166839 DOI: 10.3791/53606] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Bioprinting has emerged as a versatile biofabrication approach for creating tissue engineered organ constructs. These constructs have potential use as organ replacements for implantation in patients, and also, when created on a smaller size scale as model "organoids" that can be used in in vitro systems for drug and toxicology screening. Despite development of a wide variety of bioprinting devices, application of bioprinting technology can be limited by the availability of materials that both expedite bioprinting procedures and support cell viability and function by providing tissue-specific cues. Here we describe a versatile hyaluronic acid (HA) and gelatin-based hydrogel system comprised of a multi-crosslinker, 2-stage crosslinking protocol, which can provide tissue specific biochemical signals and mimic the mechanical properties of in vivo tissues. Biochemical factors are provided by incorporating tissue-derived extracellular matrix materials, which include potent growth factors. Tissue mechanical properties are controlled combinations of PEG-based crosslinkers with varying molecular weights, geometries (linear or multi-arm), and functional groups to yield extrudable bioinks and final construct shear stiffness values over a wide range (100 Pa to 20 kPa). Using these parameters, hydrogel bioinks were used to bioprint primary liver spheroids in a liver-specific bioink to create in vitro liver constructs with high cell viability and measurable functional albumin and urea output. This methodology provides a general framework that can be adapted for future customization of hydrogels for biofabrication of a wide range of tissue construct types.
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Affiliation(s)
- Aleksander Skardal
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences;
| | - Mahesh Devarasetty
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Young-Joon Seol
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Steven D Forsythe
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Colin Bishop
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Thomas Shupe
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest Univeristy Health Sciences
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Kang HW, Lee SJ, Ko IK, Kengla C, Yoo JJ, Atala A. A 3D bioprinting system to produce human-scale tissue constructs with structural integrity. Nat Biotechnol 2016; 34:312-9. [PMID: 26878319 DOI: 10.1038/nbt.3413] [Citation(s) in RCA: 1390] [Impact Index Per Article: 173.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/19/2015] [Indexed: 02/07/2023]
Abstract
A challenge for tissue engineering is producing three-dimensional (3D), vascularized cellular constructs of clinically relevant size, shape and structural integrity. We present an integrated tissue-organ printer (ITOP) that can fabricate stable, human-scale tissue constructs of any shape. Mechanical stability is achieved by printing cell-laden hydrogels together with biodegradable polymers in integrated patterns and anchored on sacrificial hydrogels. The correct shape of the tissue construct is achieved by representing clinical imaging data as a computer model of the anatomical defect and translating the model into a program that controls the motions of the printer nozzles, which dispense cells to discrete locations. The incorporation of microchannels into the tissue constructs facilitates diffusion of nutrients to printed cells, thereby overcoming the diffusion limit of 100-200 μm for cell survival in engineered tissues. We demonstrate capabilities of the ITOP by fabricating mandible and calvarial bone, cartilage and skeletal muscle. Future development of the ITOP is being directed to the production of tissues for human applications and to the building of more complex tissues and solid organs.
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Affiliation(s)
- Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, USA
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, USA
| | - In Kap Ko
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, USA
| | - Carlos Kengla
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, USA
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina, USA
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Lee H, Nam D, Choi JK, Araúzo-Bravo MJ, Kwon SY, Zaehres H, Lee T, Park CY, Kang HW, Schöler HR, Kim JB. Establishment of feeder-free culture system for human induced pluripotent stem cell on DAS nanocrystalline graphene. Sci Rep 2016; 6:20708. [PMID: 26846167 PMCID: PMC4742916 DOI: 10.1038/srep20708] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 09/22/2015] [Accepted: 01/11/2016] [Indexed: 12/12/2022] Open
Abstract
The maintenance of undifferentiated human pluripotent stem cells (hPSC) under
xeno-free condition requires the use of human feeder cells or extracellular matrix
(ECM) coating. However, human-derived sources may cause human pathogen contamination
by viral or non-viral agents to the patients. Here we demonstrate feeder-free and
xeno-free culture system for hPSC expansion using diffusion assisted synthesis-grown
nanocrystalline graphene (DAS-NG), a synthetic non-biological nanomaterial which
completely rule out the concern of human pathogen contamination. DAS-NG exhibited
advanced biocompatibilities including surface nanoroughness, oxygen containing
functional groups and hydrophilicity. hPSC cultured on DAS-NG could maintain
pluripotency in vitro and in vivo, and especially cell
adhesion-related gene expression profile was comparable to those of cultured on
feeders, while hPSC cultured without DAS-NG differentiated spontaneously with high
expression of somatic cell-enriched adhesion genes. This feeder-free and xeno-free
culture method using DAS-NG will facilitate the generation of clinical-grade
hPSC.
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Affiliation(s)
- Hyunah Lee
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
| | - Donggyu Nam
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
| | - Jae-Kyung Choi
- SMEs Support Center, Korea Institute of Science and Technology Information, 48058 Busan, South Korea
| | - Marcos J Araúzo-Bravo
- Group of Computational Biology and Bioinformatics, Biodonostia Health Research Institute, 20014 San Sebastián, Spain.,IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - Soon-Yong Kwon
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea.,School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
| | - Holm Zaehres
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Röntgenstrasse 20, 48149 Münster, Germany
| | - Taehee Lee
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
| | - Chan Young Park
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
| | - Hyun-Wook Kang
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
| | - Hans R Schöler
- Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Röntgenstrasse 20, 48149 Münster, Germany
| | - Jeong Beom Kim
- Hans Schöler Stem Cell Research Center (HSSCRC), School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), 44919 Ulsan, South Korea
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Abstract
Recently, numerous three-dimensional (3D) bioprinting systems have been introduced for the artificial regeneration of tissues. Among them, the extrusion-based dispensing module is the most widely used because of the processability it gives various biomaterials. The module uses high forces and temperature to dispense materials through a micro-nozzle. Generally, the harsh conditions induce thermal degradation of the material in the dispensing procedure. The thermal degradation affects the properties of the materials, and the change of the properties should be carefully controlled, because it severely affects the regeneration of tissues. Therefore, in this research, the relationship between the dispensing module and the thermal degradation of material was investigated. Extrusion-based dispensing modules can be divided into the syringe type (ST) and filament type (FT) based on working principles. We prepared a poly lactic-co-glycolic acid (PLGA) scaffold with the two methods at various time points. Then, the characteristics of the printed scaffolds were assessed by measuring molecular weight (M w), glass transition temperature (T g), in vitro degradation, compressive modulus, and cytocompatibility. The results showed that the PLGA scaffold with the FT dispensing module maintained its properties regardless of printing time points. In contrast, severe thermal degradation was observed in the scaffold group prepared by the ST dispensing module. Consequentially, it was obvious that the FT dispensing module was more suitable for producing scaffolds without severe thermal degradation.
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Affiliation(s)
- Hyungseok Lee
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang, Gyungbuk 790-784, Korea
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Abstract
We examined South Korea's destination image for Chinese tourists and compared the differences between visitors who had come to that destination because of exposure to movies or television dramas filmed at their destination (film tourists) and those who were nonfilm tourists. A survey
of 311 Chinese tourists, consisting of film tourists (n = 132) and nonfilm tourists (n = 179) revealed that South Korea is perceived as a safe, friendly, and clean tourism destination, and that Chinese tourists feel happy and relaxed during their trip. We also found that Chinese
tourists believe that Korea lacks food variety and historical attractions, and is not easy to get around. Moreover, we also found that there was a difference between film and nonfilm tourists in regard to cognitive image of the destination, in that film tourists had a more positive image than
did nonfilm tourists. However, there was no significant difference in affective destination image between film and nonfilm tourists. Our findings contribute to understanding of Chinese tourists' perceptions and behaviors in regard to South Korea as a tourism destination. In addition, the implications
for film and tourism destination marketers are discussed.
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Skardal A, Devarasetty M, Kang HW, Mead I, Bishop C, Shupe T, Lee SJ, Jackson J, Yoo J, Soker S, Atala A. A hydrogel bioink toolkit for mimicking native tissue biochemical and mechanical properties in bioprinted tissue constructs. Acta Biomater 2015. [PMID: 26210285 DOI: 10.1016/j.actbio.2015.07.030] [Citation(s) in RCA: 257] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Advancement of bioprinting technology is limited by the availability of materials that both facilitate bioprinting logistics as well as support cell viability and function by providing tissue-specific cues. Herein we describe a modular hyaluronic acid (HA) and gelatin-based hydrogel toolbox comprised of a 2-crosslinker, 2-stage polymerization technique, and the capability to provide tissue specific biochemically and mechanically accurate signals to cells within biofabricated tissue constructs. First, we prepared and characterized several tissue-derived decellularized extracellular matrix-based solutions, which contain complex combinations of growth factors, collagens, glycosaminoglycans, and elastin. These solutions can be incorporated into bioinks to provide the important biochemical cues of different tissue types. Second, we employed combinations of PEG-based crosslinkers with varying molecular weights, geometries (linear, 4-arm, and 8-arm), and functional groups to yield hydrogel bioinks that supported extrusion bioprinting and the capability to achieve final construct shear stiffness values ranging from approximately 100 Pa to 20 kPa. Lastly, we integrated these hydrogel bioinks with a 3-D bioprinting platform, and validated their use by bioprinting primary liver spheroids in a liver-specific bioink to create in vitro liver constructs with high cell viability and measurable functional albumin and urea output. This hydrogel bioink system has the potential to be a versatile tool for biofabrication of a wide range of tissue construct types. STATEMENT OF SIGNIFICANCE Biochemical and mechanical factors both have important implications in guiding the behavior of cells in vivo, yet both realms are rarely considered together in the context of biofabrication in vitro tissue construct models. We describe a modular hydrogel system that (1) facilitates extrusion bioprinting of cell-laden hydrogels, (2) incorporates tissue-specific factors derived from decellularized tissue extracellular matrix, thus mimicking biochemical tissue profile, and (3) allows control over mechanical properties to mimic the tissue stiffness. We believe that employing this technology to attend to both the biochemical and mechanical profiles of tissues, will allow us to more accurately recapitulate the in vivo environment of tissues while creating functional 3-D in vitro tissue constructs that can be used as disease models, personalized medicine, and in vitro drug and toxicology screening systems.
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Merceron TK, Burt M, Seol YJ, Kang HW, Lee SJ, Yoo JJ, Atala A. A 3D bioprinted complex structure for engineering the muscle–tendon unit. Biofabrication 2015; 7:035003. [DOI: 10.1088/1758-5090/7/3/035003] [Citation(s) in RCA: 252] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Park JH, Hong JM, Ju YM, Jung JW, Kang HW, Lee SJ, Yoo JJ, Kim SW, Kim SH, Cho DW. A novel tissue-engineered trachea with a mechanical behavior similar to native trachea. Biomaterials 2015; 62:106-15. [PMID: 26041482 DOI: 10.1016/j.biomaterials.2015.05.008] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [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: 02/17/2015] [Revised: 04/30/2015] [Accepted: 05/14/2015] [Indexed: 12/12/2022]
Abstract
A novel tissue-engineered trachea was developed with appropriate mechanical behavior and substantial regeneration of tracheal cartilage. We designed hollow bellows scaffold as a framework of a tissue-engineered trachea and demonstrated a reliable method for three-dimensional (3D) printing of monolithic bellows scaffold. We also functionalized gelatin sponge to allow sustained release of TGF-β1 for stimulating tracheal cartilage regeneration and confirmed that functionalized gelatin sponge induces cartilaginous tissue formation in vitro. A tissue-engineered trachea was then created by assembling chondrocytes-seeded functionalized gelatin sponges into the grooves of bellows scaffold and it showed very similar mechanical behavior to that of native trachea along with substantial regeneration of tracheal cartilage in vivo. The tissue-engineered trachea developed here represents a novel concept of tracheal substitute with appropriate mechanical behavior similar to native trachea for use in reconstruction of tracheal stenosis.
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Affiliation(s)
- Jeong Hun Park
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 790-784, South Korea
| | - Jung Min Hong
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 790-784, South Korea
| | - Young Min Ju
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Jin Woo Jung
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 790-784, South Korea
| | - Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Sung Won Kim
- Division of Otolaryngology and HNS, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 137-701, South Korea
| | - Soo Hyun Kim
- Biomaterials Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 136-791, South Korea
| | - Dong-Woo Cho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 790-784, South Korea.
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Kang HW, Lee SJ, Jackson J, Yoo J, Atala A. MP29-19 BUILDING VIABLE TISSUES USING A 3-D BIOPRINTER FOR SURGICAL RECONSTRUCTION. J Urol 2015. [DOI: 10.1016/j.juro.2015.02.622] [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: 10/23/2022]
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Abstract
Researchers are focusing on bioprinting technology as a viable option to overcome current difficulties in cartilage tissue engineering. Bioprinting enables a three-dimensional (3-D), free-form, computer-designed structure using biomaterials, biomolecules, and/or cells. The inner and outer shape of a scaffold can be controlled by this technology with great precision. Here, we introduce a hybrid bioprinting technology that is a co-printing process of multiple materials including high-strength synthetic polymer and cell-laden hydrogel. The synthetic polymer provides mechanical support for shape maintenance and load bearing, while the hydrogel provides the biological environment for artificial cartilage regeneration. This chapter introduces the procedures for printing of a 3-D scaffold using our hybrid bioprinting technology and includes the source materials for preparation of 3-D printing.
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Affiliation(s)
- Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, 27157, USA.
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An HS, Kang HW, Han HS, Park JY, Hong CG, Park J, Myeong JI, An CM. Genetic differences between the wild and hatchery-produced populations of Korean short barbeled grunter (Hapalogenys nitens) determined with microsatellite markers. Genet Mol Res 2014; 13:8901-12. [PMID: 25366781 DOI: 10.4238/2014.october.31.5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Short barbeled grunter, Hapalogenys nitens, is an economically important fishery resource. In Korea, this fish is in the early stage of domestication, and it has been regarded as the candidate marine fish species for prospective aquaculture diversification. This study presents a preliminary investigation of the future viability of sustainable fry production from short barbeled grunter. We used 12 polymorphic nuclear microsatellite DNA loci to analyze the possible genetic variability between the wild and hatchery-produced populations of short barbeled grunter from Korea and identified 91 alleles. Compared to the wild population, significant genetic changes including reduced genetic diversity (average allele number: 7.42 vs 3.75; average expected heterozygosity: 0.713 vs 0.598, Wilcoxon signed-rank test; P < 0.05) and differentiation [overall fixation index (FST) = 0.088, P < 0.01] occurred in the hatchery-produced population, as indicated by the observation of allele richness, unique allele, heterozygosity, FST, and results of molecular analysis of variance. These findings indicate that genetic drift may have promoted the differentiation between these 2 populations, which may have negative effects on sustainable fry production. Therefore, genetic variations of the wild and hatchery-produced populations should be monitored and subjected to control inbreeding through a commercial breeding program. The information presented by this paper would provide a useful genetic basis for future sustainable culturing planning and management of H. nitens.
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Affiliation(s)
- H S An
- Biotechnology Research Division, National Fisheries Research and Development Institute, Busan, Korea
| | - H W Kang
- Biotechnology Research Division, National Fisheries Research and Development Institute, Busan, Korea
| | - H S Han
- Biotechnology Research Division, National Fisheries Research and Development Institute, Busan, Korea
| | - J Y Park
- Aquaculture Industry Division, Nacional Fisheries Research and Development Institute, Yeosu, Korea
| | - C G Hong
- Aquaculture Industry Division, Nacional Fisheries Research and Development Institute, Yeosu, Korea
| | - J Park
- Biotechnology Research Division, National Fisheries Research and Development Institute, Busan, Korea
| | - J I Myeong
- Biotechnology Research Division, National Fisheries Research and Development Institute, Busan, Korea
| | - C M An
- Biotechnology Research Division, National Fisheries Research and Development Institute, Busan, Korea
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Lee KS, Cha SH, Kang HW, Song JY, Lee KW, Ko KB, Lee HT. Effects of serial passage on the characteristics and chondrogenic differentiation of canine umbilical cord matrix derived mesenchymal stem cells. Asian-Australas J Anim Sci 2014; 26:588-95. [PMID: 25049827 PMCID: PMC4093376 DOI: 10.5713/ajas.2012.12488] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [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: 09/10/2012] [Revised: 12/20/2012] [Accepted: 11/13/2012] [Indexed: 12/27/2022]
Abstract
Mesenchymal stem cells (MSCs) are often known to have a therapeutic potential in the cell-mediated repair for fatal or incurable diseases. In this study, canine umbilical cord MSCs (cUC-MSCs) were isolated from umbilical cord matrix (n = 3) and subjected to proliferative culture for 5 consecutive passages. The cells at each passage were characterized for multipotent MSC properties such as proliferation kinetics, expression patterns of MSC surface markers and self-renewal associated markers, and chondrogenic differentiation. In results, the proliferation of the cells as determined by the cumulative population doubling level was observed at its peak on passage 3 and stopped after passage 5, whereas cell doubling time dramatically increased after passage 4. Expression of MSC surface markers (CD44, CD54, CD61, CD80, CD90 and Flk-1), molecule (HMGA2) and pluripotent markers (sox2, nanog) associated with self-renewal was negatively correlated with the number of passages. However, MSC surface marker (CD105) and pluripotent marker (Oct3/4) decreased with increasing the number of subpassage. cUC-MSCs at passage 1 to 5 underwent chondrogenesis under specific culture conditions, but percentage of chondrogenic differentiation decreased with increasing the number of subpassage. Collectively, the present study suggested that sequential subpassage could affect multipotent properties of cUC-MSCs and needs to be addressed before clinical applications.
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Affiliation(s)
- K S Lee
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
| | - S-H Cha
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
| | - H W Kang
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
| | - J-Y Song
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
| | - K W Lee
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
| | - K B Ko
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
| | - H T Lee
- Viral Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 6-dong, Anyang-si, Gyeonggi-do 430-757, Korea
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Kang HW, Wirawan IG, Kojima M. Isolation and Genetic Analysis of anAgrobacterium tumefaciensAvirulent Mutant with a Chromosomal Mutation Produced by Transposon Mutagenesis. Biosci Biotechnol Biochem 2014; 56:1924-8. [PMID: 1369092 DOI: 10.1271/bbb.56.1924] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A transposon 5 (Tn5) insertion was introduced into the genome of A. tumefaciens (A-208 strain harboring a nopaline type Ti-plasmid) using a conjugative pJB4JI plasmid containing Tn5. Five thousand transconjugants were assayed for virulence on carrot (Daucus carota L.) disks; 54 isolates were avirulent or very attenuated. The cellular localization (plasmid or chromosome) of the Tn5 insertion in those isolates were identified by Southern hybridization analysis. An avirulent mutant (B-90 strain) with the Tn5 insertion in the chromosome was selected and characterized. The mutant had the same growth rate as that of the parent strain in L-broth. The mutant and the parent strain had similar attachment ability to carrot root cells. Tn5 was inserted into one site of the chromosome. The wild-type target chromosomal region (1281 base pairs) was cloned and sequenced. An open reading frame (ORF) consisting of 395 base pairs was identified. The wild-type DNA fragment (1.6 kb) containing the ORF introduced into B-90 strain complemented the avirulent phenotype of the strain. A soluble protein was predicted from the ORF. The Tn5 was inserted near the 3'-terminal of the ORF. Homology search of this ORF found no significant homology to known genes and proteins. Thus, the ORF identified in this paper seems to be a new chromosomal virulence gene of A. tumefaciens.
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Affiliation(s)
- H W Kang
- Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University, Japan
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Park JH, Jung JW, Kang HW, Cho DW. Indirect three-dimensional printing of synthetic polymer scaffold based on thermal molding process. Biofabrication 2014; 6:025003. [DOI: 10.1088/1758-5082/6/2/025003] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Lee JW, Kim WJ, Park CW, Kang HW, Ban HJ, Oh IJ, Kwon YS, Kim KS, Kim YI, Lim SC, Kim YC, Choi YD. Endotracheal tuberculous granuloma formation following endobronchial ultrasound transbronchial needle aspiration. Intern Med 2013; 52:1207-10. [PMID: 23728557 DOI: 10.2169/internalmedicine.52.9360] [Citation(s) in RCA: 5] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Endobronchial ultrasound-transbronchial needle aspiration (EBUS-TBNA) is a useful and safe diagnostic test. We herein report a case of endotracheal granuloma formation that occurred after EBUS-TBNA in a 73-year-old woman. The patient was admitted due to coughing and dyspnea after 70 days of antituberculous therapy for mediastinal lymphadenitis. Computed tomography revealed decreases in the size of the lymph nodes with a new mass protruding into the tracheal lumen. The mass originated from the right paratracheal area, which was a previous puncture site. This case suggests that clinicians should pay attention to complications because tuberculosis can produce new granulomas via the sinus tract after EBUS-TBNA.
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Affiliation(s)
- Jeong-Won Lee
- Department of Internal Medicine, Chonnam National University Medical School, Korea
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Min Kim J, Yi GR, Chang Lee S, Moon Lee S, Jo Y, Kang HW, Lee G, Jin Kim H. Surfactant-assisted synthesis of hybrid lithium iron phosphate nanoparticles for enhancing electrochemical performance. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2012.08.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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49
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Albanna MZ, Murphy S, Zhao W, El-Amin IB, Tan J, Dice DD, Kang HW, Jackson JD, Yoo JJ, Atala A. In situ bioprinting of skin for reconstruction. J Am Coll Surg 2012. [DOI: 10.1016/j.jamcollsurg.2012.06.235] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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50
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Kang HW, Cho DW. Development of an indirect stereolithography technology for scaffold fabrication with a wide range of biomaterial selectivity. Tissue Eng Part C Methods 2012; 18:719-29. [PMID: 22443315 PMCID: PMC3427641 DOI: 10.1089/ten.tec.2011.0621] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Accepted: 03/21/2012] [Indexed: 11/13/2022] Open
Abstract
Tissue engineering, which is the study of generating biological substitutes to restore or replace tissues or organs, has the potential to meet current needs for organ transplantation and medical interventions. Various approaches have been attempted to apply three-dimensional (3D) solid freeform fabrication technologies to tissue engineering for scaffold fabrication. Among these, the stereolithography (SL) technology not only has the highest resolution, but also offers quick fabrication. However, a lack of suitable biomaterials is a barrier to applying the SL technology to tissue engineering. In this study, an indirect SL method that combines the SL technology and a sacrificial molding process was developed to address this challenge. A sacrificial mold with an inverse porous shape was fabricated from an alkali-soluble photopolymer by the SL technology. A sacrificial molding process was then developed for scaffold construction using a variety of biomaterials. The results indicated a wide range of biomaterial selectivity and a high resolution. Achievable minimum pore and strut sizes were as large as 50 and 65 μm, respectively. This technology can also be used to fabricate three-dimensional organ shapes, and combined with traditional fabrication methods to construct a new type of scaffold with a dual-pore size. Cytotoxicity tests, as well as nuclear magnetic resonance and gel permeation chromatography analyses, showed that this technology has great potential for tissue engineering applications.
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Affiliation(s)
- Hyun-Wook Kang
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, North Carolina
| | - Dong-Woo Cho
- Department of Mechanical Engineering, Pohang University of Science and Technology, Gyungbuk, South Korea
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Gyungbuk, South Korea
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