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Farandos N, Jang I, Alexander J, Kelsall G. 3-D inkjet printed solid oxide electrochemical reactors III. Cylindrical pillared electrode microstructures. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Jang I, Alexander J, Farandos N, Kelsall G. Predicting optimal geometries of 3D-printed solid oxide electrochemical reactors. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140902] [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: 11/03/2022]
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Jang I, Kelsall G. Fabrication of 3D NiO-YSZ structures for enhanced performance of solid oxide fuel cells and electrolysers. Electrochem commun 2022. [DOI: 10.1016/j.elecom.2022.107260] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Abstract
The review paper overviews principles of inkjet printing and ink formulation, subsequently a literature summary on inkjet-printed solid oxide electrochemical reactors printed with 2D and 3D structures, followed by challenges limiting the technique.
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Affiliation(s)
- S. S. Kawale
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
| | - I. Jang
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
| | - N. M. Farandos
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
| | - G. H. Kelsall
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
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Hong G, Kim J, Oh H, Yun S, Kim CM, Jeong YM, Yun WS, Shim JH, Jang I, Kim CY, Jin S. Production of Multiple Cell-Laden Microtissue Spheroids with a Biomimetic Hepatic-Lobule-Like Structure. Adv Mater 2021; 33:e2102624. [PMID: 34286875 DOI: 10.1002/adma.202102624] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/07/2021] [Indexed: 05/11/2023]
Abstract
The construction of an in vitro 3D cellular model to mimic the human liver is highly desired for drug discovery and clinical applications, such as patient-specific treatment and cell-based therapy in regenerative medicine. However, current bioprinting strategies are limited in their ability to generate multiple cell-laden microtissues with biomimetic structures. This study presents a method for producing hepatic-lobule-like microtissue spheroids using a bioprinting system incorporating a precursor cartridge and microfluidic emulsification system. The multiple cell-laden microtissue spheroids can be successfully generated at a speed of approximately 45 spheroids min-1 and with a uniform diameter. Hepatic and endothelial cells are patterned in a microtissue spheroid with the biomimetic structure of a liver lobule. The spheroids allow long-term culture with high cell viability, and the structural integrity is maintained longer than that of non-structured spheroids. Furthermore, structured spheroids show high MRP2, albumin, and CD31 expression levels. In addition, the in vivo study reveals that structured microtissue spheroids are stably engrafted. These results demonstrate that the method provides a valuable 3D structured microtissue spheroid model with lobule-like constructs and liver functions.
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Affiliation(s)
- Gyusik Hong
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Jin Kim
- Laboratory Animal Medicine, College of Veterinary Medicine, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
- College of Veterinary Medicine, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Hyeongkwon Oh
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Seokhwan Yun
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Chul Min Kim
- Department of Mechatronics, Gyeongsang National University, 33, Dongjin-ro, Jinju, 52725, Republic of Korea
| | - Yun-Mi Jeong
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Won-Soo Yun
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
- Research Institute, T&R Biofab. Co. Ltd, 242 Pangyo-ro, Seongnam, Gyeonggi, 13487, Republic of Korea
| | - Jin-Hyung Shim
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
- Research Institute, T&R Biofab. Co. Ltd, 242 Pangyo-ro, Seongnam, Gyeonggi, 13487, Republic of Korea
| | - Ilho Jang
- Research Institute, T&R Biofab. Co. Ltd, 242 Pangyo-ro, Seongnam, Gyeonggi, 13487, Republic of Korea
| | - C-Yoon Kim
- College of Veterinary Medicine, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Songwan Jin
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
- Research Institute, T&R Biofab. Co. Ltd, 242 Pangyo-ro, Seongnam, Gyeonggi, 13487, Republic of Korea
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Kang D, Hong G, An S, Jang I, Yun WS, Shim JH, Jin S. Bioprinting of Multiscaled Hepatic Lobules within a Highly Vascularized Construct. Small 2020; 16:e1905505. [PMID: 32078240 DOI: 10.1002/smll.201905505] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [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: 09/26/2019] [Revised: 01/25/2020] [Indexed: 06/10/2023]
Abstract
Highly vascularized complex liver tissue is generally divided into lobes, lobules, hepatocytes, and sinusoids, which can be viewed under different types of lens from the micro- to macro-scale. To engineer multiscaled heterogeneous tissues, a sophisticated and rapid tissue engineering approach is required, such as advanced 3D bioprinting. In this study, a preset extrusion bioprinting technique, which can create heterogeneous, multicellular, and multimaterial structures simultaneously, is utilized for creating a hepatic lobule (≈1 mm) array. The fabricated hepatic lobules include hepatic cells, endothelial cells, and a lumen. The endothelial cells surround the hepatic cells, the exterior of the lobules, the lumen, and finally, become interconnected with each other. Compared to hepatic cell/endothelial cell mixtures, the fabricated hepatic lobule shows higher albumin secretion, urea production, and albumin, MRP2, and CD31 protein levels, as well as, cytochrome P450 enzyme activity. It is found that each cell type with spatial cell patterning in bioink accelerates cellular organization, which could preserve structural integrity and improve cellular functions. In conclusion, preset extruded hepatic lobules within a highly vascularized construct are successfully constructed, enabling both micro- and macro-scale tissue fabrication, which can support the creation of large 3D tissue constructs for multiscale tissue engineering.
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Affiliation(s)
- Donggu Kang
- Research Institute, T&R Biofab. Co. Ltd., 242 Pangyo-ro, Seongnam-si, 13487, Republic of Korea
| | - Gyusik Hong
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Seongmin An
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Ilho Jang
- Research Institute, T&R Biofab. Co. Ltd., 242 Pangyo-ro, Seongnam-si, 13487, Republic of Korea
| | - Won-Soo Yun
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Jin-Hyung Shim
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
| | - Songwan Jin
- Department of Mechanical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, 15073, Republic of Korea
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Jang I, Jung H, Park H, Lee Y, Lee E, Kim D. DETERMINATION OF CLINICALLY MEANINGFUL CHANGES IN FRAILTY MEASURES. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- I Jang
- Department of Internal Medicine, Asan Medical Center
| | | | - H Park
- Division of Geriatrics, Department of Internal Medicine, Asan Medical Center
| | - Y Lee
- Department of Internal Medicine, Asan Medical Center
| | - E Lee
- Department of Internal Medicine, Asan Medical Center
| | - D Kim
- Division of Gerontology, Beth Israel Deaconess Medical Center
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Jung H, Jang I, Lee E, Lee Y. COMPARISONS OF AUTOMATICALLY AND MANUALLY ACQUIRED GAIT SPEED IN KOREAN RURAL COMMUNITY DWELLING OLDER PEOPLE. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | | | | | - Y Lee
- Department of Internal Medicine, Asan Medical Center
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Park TM, Kang D, Jang I, Yun WS, Shim JH, Jeong YH, Kwak JY, Yoon S, Jin S. Fabrication of In Vitro Cancer Microtissue Array on Fibroblast-Layered Nanofibrous Membrane by Inkjet Printing. Int J Mol Sci 2017; 18:ijms18112348. [PMID: 29112150 PMCID: PMC5713317 DOI: 10.3390/ijms18112348] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 10/29/2017] [Accepted: 11/02/2017] [Indexed: 01/21/2023] Open
Abstract
In general, a drug candidate is evaluated using 2D-cultured cancer cells followed by an animal model. Despite successful preclinical testing, however, most drugs that enter human clinical trials fail. The high failure rates are mainly caused by incompatibility between the responses of the current models and humans. Here, we fabricated a cancer microtissue array in a multi-well format that exhibits heterogeneous and batch-to-batch structure by continuous deposition of collagen-suspended Hela cells on a fibroblast-layered nanofibrous membrane via inkjet printing. Expression of both Matrix Metalloproteinase 2 (MMP2) and Matrix Metalloproteinase 9 (MMP9) was higher in cancer microtissues than in fibroblast-free microtissues. The fabricated microtissues were treated with an anticancer drug, and high drug resistance to doxorubicin occurred in cancer microtissues but not in fibroblast-free microtissues. These results introduce an inkjet printing fabrication method for cancer microtissue arrays, which can be used for various applications such as early drug screening and gradual 3D cancer studies.
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Affiliation(s)
- Tae-Min Park
- Research Institute, Femtobiomed Co., Ltd., 700, Pangyo-ro, Seongnam-si, Gyeonggi-do 13516, Korea.
| | - Donggu Kang
- Department of Mechanical System Engineering, Korea Polytechnic Univsersity, 237 Sangidaehak-ro, Siheung-si, Gyoenggi-do 15073, Korea.
| | - Ilho Jang
- Department of Advanced Convergence Technology, Korea Polytechnic Univsersity, 237 Sangidaehak-ro, Siheung-si, Gyoenggi-do 15073, Korea.
| | - Won-Soo Yun
- Research Institute, T&R Biofab Co., Ltd., 237 Sangidaehak-ro, Siheung-si, Gyoenggi-do 15073, Korea.
- Department of Mechanical Engineering, Korea Polytechnic Univsersity, 237 Sangidaehak-ro, Siheung-si, Gyoenggi-do 15073, Korea.
| | - Jin-Hyung Shim
- Department of Mechanical Engineering, Korea Polytechnic Univsersity, 237 Sangidaehak-ro, Siheung-si, Gyoenggi-do 15073, Korea.
| | - Young Hun Jeong
- School of Mechanical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, Korea.
| | - Jong-Young Kwak
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721, Korea.
| | - Sik Yoon
- Department of Anatomy, Pusan National University School of Medicine, Yangsan 626-770, Korea.
| | - Songwan Jin
- Department of Mechanical Engineering, Korea Polytechnic Univsersity, 237 Sangidaehak-ro, Siheung-si, Gyoenggi-do 15073, Korea.
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Leong HJ, Jang I, Hyun KS, Jung SK, Hong GH, Jeong HA, Oh SG. Preparation of alpha-bisabolol and phenylethyl resorcinol/TiO2 hybrid composites for potential applications in cosmetics. Int J Cosmet Sci 2016; 38:524-34. [PMID: 27139639 DOI: 10.1111/ics.12339] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 04/30/2016] [Indexed: 01/19/2023]
Abstract
OBJECTIVE Bifunctional alpha-bisabolol and phenylethyl resorcinol/TiO2 hybrids were prepared to apply in cosmetic fields, particularly in anti-ageing and hyperpigmentation treatment. The synergistic effect of combined antioxidant and UV filtering properties was achieved through functionalization of TiO2 particles with skin-lightening materials such as alpha-bisabolol and phenylethyl resorcinol. METHODS TiO2 microspheres with a diameter of about 1 μm were synthesized through surfactant-assisted sol-gel method for use as supporting materials in the formation of hybrid composites. Carboxylation treatment was performed for surface modification of the TiO2 surface with carboxyl groups as chemical binders. Esterification reaction between carboxyl groups of carboxylated TiO2 and hydroxyl groups of alpha-bisabolol or phenylethyl resorcinol was performed. The hybrids were characterized using various techniques such as FE-SEM, DLS, EDS, ATR-FTIR, XPS and TGA. For application of prepared TiO2 composites in the field of cosmetics, the anti-radicular antioxidant abilities were evaluated using ABTS and DPPH colorimetric antioxidant assay. RESULTS Organic/inorganic hybrid composites were successfully formed using esterification reaction between the carboxyl groups at TiO2 surface and the hydroxyl groups of the skin-lightening materials. The results demonstrate that both functionalized microspheres show scavenging ability towards the ABTS(•) and DPPH(•) radicals. Specifically, the phenylethyl resorcinol/TiO2 composites exhibited the highest antioxidant ability among the prepared samples owing to the presence of phenolic groups to scavenge free radicals. CONCLUSION Using this strategy, it could be possible to prepare not only inorganic UV filter but also hybrid organic/inorganic materials with multifunctions and advantages which would be in a great demand for cosmetic applications.
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Affiliation(s)
- H J Leong
- Department of Chemical Engineering, Hanyang University, Seoul, 133-791, Korea
| | - I Jang
- Department of Chemical Engineering, Hanyang University, Seoul, 133-791, Korea
| | - K-S Hyun
- Tonymoly Research Institute, Simin-daero 327 beon-gil 16, Anyang-si, Gyeonggi-do, Korea
| | - S-K Jung
- Tonymoly Research Institute, Simin-daero 327 beon-gil 16, Anyang-si, Gyeonggi-do, Korea
| | - G-H Hong
- Tonymoly Research Institute, Simin-daero 327 beon-gil 16, Anyang-si, Gyeonggi-do, Korea
| | - H-A Jeong
- Tonymoly Research Institute, Simin-daero 327 beon-gil 16, Anyang-si, Gyeonggi-do, Korea
| | - S-G Oh
- Department of Chemical Engineering, Hanyang University, Seoul, 133-791, Korea.
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An K, Jang I, Choi DS, Jost-Brinkmann PG, Cha BK. Identification of a stable reference area for superimposing mandibular digital models. J Orofac Orthop 2015; 76:508-19. [DOI: 10.1007/s00056-015-0310-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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An H, Chung J, Yu K, Jang I. Joint bio-equivalence tests with multivariate Gaussian random effects. Clin Ther 2015. [DOI: 10.1016/j.clinthera.2015.05.250] [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: 10/23/2022]
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Park B, Jung D, Kang S, Ko Y, Ha D, Kwon C, Park M, Han J, Jang I, Lee C. Effects of dietary supplementation of a zinc oxide product encapsulated with lipid on growth performance, intestinal morphology, and digestive enzyme activities in weanling pigs. Anim Feed Sci Technol 2015. [DOI: 10.1016/j.anifeedsci.2014.11.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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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Abstract
Autophagy regulates cellular homeostasis through degradation of aged or damaged subcellular organelles and components. Interestingly, autophagy-deficient beta cells, for example Atg7-mutant mice, exhibited hypoinsulinemia and hyperglycemia. Also, autophagy response is diminished in heart of diabetic mice. These results implied that autophagy and diabetes are closely connected and affect each other. Although protein O-GlcNAcylation is up-regulated in hyperglycemia and diabetes, and O-GlcNAcylated proteins play an important role in metabolism and nutrient sensing, little is known whether autophagy affects O-GlcNAc modification and vice versa. In this study, we suppressed the action of mTOR by treatment of mTOR catalytic inhibitors (PP242 and Torin1) to induce autophagic flux. Results showed a decrease in global O-GlcNAcylation, which is due to decreased OGT protein and increased OGA protein. Interestingly, knockdown of ATG genes or blocking of lysosomal degradation enhanced protein stability of OGT. In addition, when proteasomal inhibitor was treated together with mTOR inhibitor, protein level of OGT almost recovered to control level. These data suggest that mTOR inhibition is a more efficient way to reduce protein level of OGT rather than that of CHX treatment. We also showed that not only proteasomal degradation regulated OGT stability but autophagic degradation also affected OGT stability in part. We concluded that mTOR signaling regulates protein O-GlcNAc modification through adjustment of OGT stability.
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Affiliation(s)
- S Park
- Department of Integrated OMICS for Biomedical Science, WCU Program of Graduate School, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
| | - J Pak
- Department of Integrated OMICS for Biomedical Science, WCU Program of Graduate School, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
| | - I Jang
- Department of Integrated OMICS for Biomedical Science, WCU Program of Graduate School, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
| | - J W Cho
- Department of Integrated OMICS for Biomedical Science, WCU Program of Graduate School, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea.
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Lee U, Jang I. Blood flow analysis by using the viscoelastic blood vessel model-based spectral element model. J Biotechnol 2010. [DOI: 10.1016/j.jbiotec.2010.08.093] [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: 11/25/2022]
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Lee S, Han J, Jang I, Choi I, Kim J. 67. Carpal tunnel syndrome on unaffected hand in chronic stroke. Clin Neurophysiol 2009. [DOI: 10.1016/j.clinph.2008.10.085] [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: 11/17/2022]
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Kim I, Jin EJ, Baik K, Park CH, Kim WK, Kang CW, Ko Y, Jang I, Choi WS, Lee CY. Expression and Secretion of the Insulin-like Growth Factor System Components by Pig Liver Cells. Asian Australas J Anim Sci 2008. [DOI: 10.5713/ajas.2008.70558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lim H, Lee H, Lee K, Lee E, Jang I, Ro J. CYP2D6 genotypes in association with steady state plasma concentrations of active metabolites of tamoxifen in patients with breast cancer. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
634 Background: Tamoxifen is a prodrug that is metabolized to active metabolites, Z-4-hydroxy-N-desmethyltamoxifen (BX) and Z-4-hydroxy-tamoxifen (4OH) where CYP2D6 plays a major role in the conversion. Genetic polymorphisms of CYP2D6 by ethnicities are well known with CYP2D6*10 in Asians (up to 50% in Koreans), and CYP2D6 *2 and *4 in American Whites as major variant alleles. We analyzed the steady state plasma concentrations of tamoxifen and its metabolites in patients (pts) with breast cancer to evaluate their associations with various CYP2D6 genotypes. Methods: Blood samples were collected from 219 pts on tamoxifen, 20 mg daily as adjuvant therapy for more than 3 months at National Cancer Center, Korea. Plasma tamoxifen, N-desmethyltamoxifen, BX, 4OH were measured by validated HPLC with fluorescence detector, and analyzed according to CYP2D6 genotype groups by Wilcoxon rank sum test. CYP2D6*10, CYP2D6*5 and CYP2D6*2×2 were identified by PCR-RFLP methods, and the rests were classified as CYP2D6*1 (wild type). This study was approved by IRB at National Cancer Center Hospital (NCCNHS04–033) and conducted after informed consent obtained by the patients. Results: Thus far, we measured plasma concentration of tamoxifen and its metabolites for 158 pts among 198 pts genotyped. 59 pts (29.8%) carried CYP2D6*1/*1, 84 pts (42.4%) *1/*10 and 49 pts (24.7%) *10/*10. Other types were CYP2D6*1/*5 (8.6%), *5/*5 (1.0%), *1/*2×2 (2.5%). Pts with CYP2D6 *10/*10 (n=40) demonstrated significantly lower steady state plasma concentrations of BX and 4OH than those with other genotypes (n=118) (BX: 7.9 vs.19.2. ng/ml [95 % CI; 5.5–10.4 vs. 15.8–22.7 ng/ml] p<0.0001; 4OH: 1.5 vs. 2.8 ng/ml [95 % CI; 1.1–2.0 vs. 2.3–3.3 ng/ml] p<0.0001), whereas there were no differences with *1/*10 (n=64) vs. without *10 allele (n=54) (BX: 20.6 vs. 18.1 ng/ml; 4OH: 2.9 vs. 2.7 ng/ml). Basically no significant differences in BX/4OH or other compounds by various CYP2D6*2 ×2 and *5 alleles were observed. Conclusions: The steady state plasma concentrations of BX and 4OH were significantly low with CYP2D6 *10/*10 genotype, and their clinical implications need to be explored.(Supported by a grant NCC-0410590). No significant financial relationships to disclose.
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Affiliation(s)
- H. Lim
- Research Institute and Hospital, National Cancer Center, Gyeonggi-do, Republic of Korea; National Cancer Center, Gyeonggi-do, Republic of Korea; Seoul National University College of Medicine, Seoul, Republic of Korea
| | - H. Lee
- Research Institute and Hospital, National Cancer Center, Gyeonggi-do, Republic of Korea; National Cancer Center, Gyeonggi-do, Republic of Korea; Seoul National University College of Medicine, Seoul, Republic of Korea
| | - K. Lee
- Research Institute and Hospital, National Cancer Center, Gyeonggi-do, Republic of Korea; National Cancer Center, Gyeonggi-do, Republic of Korea; Seoul National University College of Medicine, Seoul, Republic of Korea
| | - E. Lee
- Research Institute and Hospital, National Cancer Center, Gyeonggi-do, Republic of Korea; National Cancer Center, Gyeonggi-do, Republic of Korea; Seoul National University College of Medicine, Seoul, Republic of Korea
| | - I. Jang
- Research Institute and Hospital, National Cancer Center, Gyeonggi-do, Republic of Korea; National Cancer Center, Gyeonggi-do, Republic of Korea; Seoul National University College of Medicine, Seoul, Republic of Korea
| | - J. Ro
- Research Institute and Hospital, National Cancer Center, Gyeonggi-do, Republic of Korea; National Cancer Center, Gyeonggi-do, Republic of Korea; Seoul National University College of Medicine, Seoul, Republic of Korea
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Chung J, Cho J, Lim H, Hong K, Oh D, Yi S, Shin S, Jang I. Contribution of CYP3A5 genetic polymorphism in cyclosporine pharmacokinetics assessed from routine TDM data using mixed effect modeling. Clin Pharmacol Ther 2003. [DOI: 10.1016/s0009-9236(03)90565-0] [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: 10/25/2022]
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Bae K, Lim H, Hong K, Chung J, Yi S, Cho J, Jang I, Hong W, Shin S. Simultaneous Pharmacokinetic-Pharmacodynamic Modeling and Phase 2 Clinical Trial Simulation of A Reversible Proton Pump Inhibitor. Clin Pharmacol Ther 2003. [DOI: 10.1016/s0009-9236(03)90543-1] [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: 10/25/2022]
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Hong K, Lim H, Cho J, Chung J, Oh D, Yi S, Bae K, Jang I, Baik J, Shin S. Tolerability and single dose pharmacokinetics of a new PDE5 inhibitor, DA-8159 in healthy male subjects. Clin Pharmacol Ther 2003. [DOI: 10.1016/s0009-9236(03)90429-2] [Citation(s) in RCA: 4] [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: 10/25/2022]
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Abstract
Age- and strain-associated alterations in intestinal and hepatic antioxidant defense enzymes including superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), and glutathione-S-transferase (GST), and lipid peroxidation were examined in Wistar and F344 rats of both strains aged 2 weeks, 2.5, 10 and 23 months. In the small intestine, activities of SOD and GSH-PX and lipid peroxidation were not affected by age or strain difference. Intestinal GST activity was noticeably increased with age in both strains, but somewhat different pattern of age-related changes occurred between two strains. Wistar rats aged 23 months had a significantly higher intestinal GST activity than corresponding age of F344 rats. In the liver, cytosolic SOD activity was not affected by age and strain, whereas GSH-PX and GST activities and lipid peroxidation were markedly influenced by age or strain difference. In particular, hepatic GSH-PX in Wistar rats resulted in a significant increase after 10 months of age and stayed at this level till 23 months of age we examined. Also, Wistar rats showed a higher lipid peroxidation in the liver of 2.5 months old when compared with corresponding age of F344 rats. However, F344 rats did not show any significant age-dependent changes in GSH-PX and lipid peroxidation. In contrast, the GST activity did show much of an age-associated alteration in both strains. Age-associated change in GST activity of Wistar rats was much greater than that observed in F344 rats, especially late in the lifetime (23 months old). It is concluded from our results that age has profound impact on development of some antioxidant enzymes in the small intestine and liver and also strain-related difference in development of antioxidant defense system was observed at least some time of rat life.
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Affiliation(s)
- I Jang
- Department of Animal Science and Biotechnology, Chinju National University 150, Chilam-Dong, Chinju, 660-758, Kyung-Nam, South Korea.
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23
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Jang I, Jung K, Cho J. Influence of age on duodenal brush border membrane and specific activities of brush border membrane enzymes in Wistar rats. Exp Anim 2000; 49:281-7. [PMID: 11109554 DOI: 10.1538/expanim.49.281] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [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: 10/31/2022] Open
Abstract
To examine age-related changes in the morphology of intestinal brush border membrane (BBM; microvilli) and specific activities of intestinal BBM enzymes including alkaline phosphatase (ALP), gamma-glutamyl transpeptidase (gamma-GT), and disacchridase, four groups of Wistar rats were sacrificed at 2.5 wk, 5 wk, 5 mon and 23 mon. In an electron microscopic examination, morphologically a less dense BBM structure in the duodenum of rats aged 23 mon was observed than that of rats aged 5 mon. Specific activity of ALP in the duodenum from 5-mon-old rats was significantly higher than from rats aged 2.5 wk and 23 mon. The mucosal tissues from 5-wk-old rats had significantly higher specific activity of gamma-GT than did tissues from the other ages. In sucrase and maltase specific activities, 5-mon-old rats had higher activities of these enzymes than other age groups, especially 2.5-wk- and 23-mon-old rats. There was also a significant effect of site on intestinal BBM enzyme activities in post-weanling rats. Regional gradients of ALP and gamma-GT along the entire small intestine (duodenum > jejunum > ileum) were remarkable. Disaccharidase activities peaked in the jejunum and declined toward both the duodenum and ileum. Taken together the result obtained here suggested that 5-mon-old rats had the most elevated intestinal function. This result also strongly indicated that the structure of the intestinal BBM and development of intestinal BBM enzymes in Wistar rate were markedly influenced by age during the postnatal period.
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Affiliation(s)
- I Jang
- Department of Animal Science, College of Agriculture, Chinju National University, Kyung-Nam, Korea
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24
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Nagurney JT, Brown DF, Chae C, Chang YC, Cranmer H, Chung W, Dan L, Fisher J, Grossman S, Jang I, Lewandrowski K, O'Connor M. One-month follow-up and natural history of patients presenting to an emergency department with symptoms suggestive of acute cardiac ischemia. Ann Emerg Med 1999. [DOI: 10.1016/s0196-0644(99)80346-1] [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: 10/24/2022]
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25
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Abstract
The present study was designed to determine age-related changes in intestinal and hepatic antioxidant enzymes including superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), and glutathione-S-transferase (GST), and lipid peroxidation in male Wistar rats (n = 8) aged 2 wk, 2.5 mon, 5 mon, 10 mon, and 23 mon. In the small intestine, cytosolic SOD, GSH-PX activities and lipid peroxidation were not affected by age, but intestinal GST activity was noticeably enhanced as age increased. In particular, intestinal GST activity in 23 mon old rats was 3 times as strong as that in 2 wk old rats. In the liver, the activity of hepatic cytosolic SOD was not affected by age, whereas GSH-PX and GST activities in rats aged 10 mon and 23 mon were much stronger than those in rats aged 2 wk, 2.5 mon, and 5 mon. The increased lipid peroxidation in 2.5 mon and 5 mon old rats was observed when compared with that of other groups. It is therefore concluded from the results presented here that age greatly increases GST activity in the small intestinal mucosae and increasing GSH-PX, GST activities and lipid peroxidation in the liver from male Wistar rats.
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Affiliation(s)
- I Jang
- Laboratory Animal Resources, Korea FDA, Seoul, Korea
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26
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Choi YK, Jung KK, Chae KY, Jang I, Lee BD, Nahm KH. Effects of vitamin E and seleium supplementation to diets containg aflatoxin B1 on the contents of liver lipids and various blood parameters in rats. Asian Australas J Anim Sci 1995. [DOI: 10.5713/ajas.1995.379] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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27
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Abstract
In the carboxypeptidase A-catalyzed hydrolysis of O-[trans-alpha-(benzoylamino)-cinnamoyl]-L-beta-phenyllactate (BACPL) or O-[trans-alpha-(benzoylamino)-p-(phenylazo)cinnamoyl]-L-beta-phenyllacta te (BAPACPL), biphasic kinetic behavior was observed due to the accumulation of an intermediate. At -12 degrees C, conversion of the intermediate into the product was much slower than the formation of the intermediate, which accumulated in quantitative amounts. From the absorbance changes observed during the formation process of the intermediate, the concentration of active site of the enzyme was determined.
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Affiliation(s)
- J Suh
- Department of Chemistry, Seoul National University, Korea
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