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Woo JY, Park MH, Jeong SH, Kim YH, Kim B, Lee TW, Han TH. Advances in Solution-Processed OLEDs and their Prospects for Use in Displays. Adv Mater 2023; 35:e2207454. [PMID: 36300804 DOI: 10.1002/adma.202207454] [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] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/05/2022] [Indexed: 06/16/2023]
Abstract
This review outlines problems and progress in development of solution-processed organic light-emitting diodes (SOLEDs) in industry and academia. Solution processing has several advantages such as low consumption of materials, low-cost processing, and large-area manufacturing. However, use of a solution process entails complications, such as the need for solvent resistivity and solution-processable materials, and yields SOLEDs that have limited luminous efficiency, severe roll-off characteristics, and short lifetime compared to OLEDs fabricated using thermal evaporation. These demerits impede production of practical SOLED displays. This review outlines the industrial demands for commercial SOLEDs and the current status of SOLED development in industries and academia, and presents research guidelines for the development of SOLEDs that have high efficiency, long lifetime, and good processability to achieve commercialization.
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Affiliation(s)
- Joo Yoon Woo
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Min-Ho Park
- Department of Organic Materials and Fiber Engineering, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul, 06978, Republic of Korea
| | - Su-Hun Jeong
- Future Technology Research Center, LG Chem, Ltd., 30, Magokjunang 10-ro, Gangseo-gu, Seoul, 07794, Republic of Korea
| | - Young-Hoon Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Byungjae Kim
- Future Technology Research Center, LG Chem, Ltd., 30, Magokjunang 10-ro, Gangseo-gu, Seoul, 07794, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, School of Chemical and Biological Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, Soft Foundry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Tae-Hee Han
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
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Kim DY, Jung JG, Lee YJ, Park MH. Lead-Free Halide Perovskite Nanocrystals for Light-Emitting Diodes. Materials (Basel) 2023; 16:6317. [PMID: 37763594 PMCID: PMC10532894 DOI: 10.3390/ma16186317] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 09/11/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
Lead-based halide perovskite nanocrystals (PeNCs) have demonstrated remarkable potential for use in light-emitting diodes (LEDs). This is because of their high photoluminescence quantum yield, defect tolerance, tunable emission wavelength, color purity, and high device efficiency. However, the environmental toxicity of Pb has impeded their commercial viability owing to the restriction of hazardous substances directive. Therefore, Pb-free PeNCs have emerged as a promising solution for the development of eco-friendly LEDs. This review article presents a detailed analysis of the various compositions of Pb-free PeNCs, including tin-, bismuth-, antimony-, and copper-based perovskites and double perovskites, focusing on their stability, optoelectronic properties, and device performance in LEDs. Furthermore, we address the challenges encountered in using Pb-free PeNC-LEDs and discuss the prospects and potential of these Pb-free PeNCs as sustainable alternatives to lead-based PeLEDs. In this review, we aim to shed light on the current state of Pb-free PeNC LEDs and highlight their significance in driving the development of eco-friendly LED technologies.
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Affiliation(s)
- Do-Young Kim
- Department of Materials Science and Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea; (D.-Y.K.); (J.-G.J.); (Y.-J.L.)
- Department of Green Chemistry and Materials Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
| | - Jae-Geun Jung
- Department of Materials Science and Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea; (D.-Y.K.); (J.-G.J.); (Y.-J.L.)
- Department of Green Chemistry and Materials Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
| | - Ye-Ji Lee
- Department of Materials Science and Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea; (D.-Y.K.); (J.-G.J.); (Y.-J.L.)
| | - Min-Ho Park
- Department of Materials Science and Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea; (D.-Y.K.); (J.-G.J.); (Y.-J.L.)
- Department of Green Chemistry and Materials Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
- Integrative Institute of Basic Science, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic of Korea
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Miller K, Gannon MR, Medina J, Clements K, Dodwell D, Horgan K, Park MH, Cromwell DA. Variation in Rates of Post-Mastectomy Radiotherapy Among Women with Early Invasive Breast Cancer in England and Wales: A Population-Based Cohort Study. Clin Oncol (R Coll Radiol) 2023; 35:e549-e560. [PMID: 37321887 DOI: 10.1016/j.clon.2023.05.016] [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: 09/27/2022] [Revised: 04/28/2023] [Accepted: 05/25/2023] [Indexed: 06/17/2023]
Abstract
AIMS This study examined whether patterns of post-mastectomy radiotherapy (PMRT) among women with early invasive breast cancer (EIBC) varied within England and Wales and explored the role of different patient factors in explaining any variation. MATERIALS AND METHODS The study used national cancer data on women aged ≥50 years diagnosed with EIBC (stage I-IIIa) in England and Wales between January 2014 and December 2018 who had a mastectomy within 12 months of diagnosis. A multilevel mixed-effects logistic regression model was used to calculate risk-adjusted rates of PMRT for geographical regions and National Health Service acute care organisations. The study examined the variation in these rates within subgroups of women with different risks of recurrence (low: T1-2N0; intermediate: T3N0/T1-2N1; high: T1-2N2/T3N1-2) and investigated whether the variation was linked to patient case-mix within regions and organisations. RESULTS Among 26 228 women, use of PMRT increased with greater recurrence risk (low: 15.0%; intermediate: 59.4%; high: 85.1%). In all risk groups, use of PMRT was more common among women who had received chemotherapy and decreased among women aged ≥80 years. There was weak or no evidence of an association between use of PMRT and comorbidity or frailty, for each risk group. In women with an intermediate risk, unadjusted rates of PMRT varied substantially between geographical regions (range 40.3-77.3%), but varied less for the high-risk (range 77.1-91.6%) and low-risk groups (range 4.1-32.9%). Adjusting for patient case-mix reduced the variation in regional and organisational PMRT rates to a small degree. CONCLUSIONS Rates of PMRT are consistently high across England and Wales among women with high-risk EIBC, but variation exists across regions and organisations for women with intermediate-risk EIBC. Effort is required to reduce unwarranted variation in practice for intermediate-risk EIBC.
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Affiliation(s)
- K Miller
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research & Policy, London School of Hygiene & Tropical Medicine, London, UK.
| | - M R Gannon
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research & Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - J Medina
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research & Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - K Clements
- National Cancer Registration and Analysis Service, NHS Digital, Birmingham, UK
| | - D Dodwell
- Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - K Horgan
- Department of Breast Surgery, St James's University Hospital, Leeds, UK
| | - M H Park
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research & Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - D A Cromwell
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research & Policy, London School of Hygiene & Tropical Medicine, London, UK
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Kim HS, Oh BY, Cheong C, Park MH, Chung SS, Lee RA, Kim KH, Noh GT. Single-incision robotic colorectal surgery with the da Vinci SP® surgical system: initial results of 50 cases. Tech Coloproctol 2023; 27:589-599. [PMID: 36971849 DOI: 10.1007/s10151-023-02791-5] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 03/14/2023] [Indexed: 06/06/2023]
Abstract
PURPOSE The da Vinci SP® (dVSP) surgical system (Intuitive Surgical, Sunnyvale, CA, USA), a robotic platform designed for single-incision surgery, overcame the need for multiple ports in traditional robotic surgery and issues including triangulation and retraction in single-incision laparoscopic surgery. However, previous studies only included case reports or series with small sample sizes. The aim of this study was to assess the safety and performance of the dVSP surgical system and its instruments and accessories for colorectal procedures. METHODS The medical records of patients who had surgery with the dVSP from March 2019 to September 2021 at Ewha Womans University Seoul Hospital were investigated. The pathologic and follow-up data of patients who had malignant tumors were analyzed separately to evaluate oncological safety. RESULTS Fifty patients (26 male and 24 female) with a median age of 59 years (interquartile range 52.5-63.0 years) were enrolled. The procedures included low anterior resection with total mesorectal excision (n = 16), sigmoid colectomy with complete mesocolic excision and central vessel ligation (CME + CVL) (n = 14), right colectomy with CME + CVL (n = 9), left colectomy with CME + CVL (n = 4), right colectomy (n = 6), and sigmoid colectomy (n = 1). Operative time significantly decreased after 25 cases (early phase vs. late phase; operative time 295.0 min vs. 250.0 min, p = 0.015; docking time 16.0 min vs. 12.0 min, p = 0.001; console time 212.0 min vs. 190.0 min, p = 0.019). Planned procedures were successfully completed in all patients. Postoperative outcomes were acceptable with only six cases of mild adverse events through a 3-month follow-up. No local recurrence and only one case of systemic recurrence occurred within 1 year postoperatively. CONCLUSIONS This study demonstrated the surgical and oncological safety and feasibility of dVSP, which may be a novel surgical platform for colorectal surgery.
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Affiliation(s)
- H S Kim
- Department of Surgery, Ewha Womans University College of Medicine, 260, Gonghang-Daero, Gangseo-Gu, Seoul, 07804, South Korea
| | - B-Y Oh
- Department of Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, South Korea
| | - C Cheong
- Department of Surgery, Korea University Guro Hospital, Korea University College of Medicine, Seoul, South Korea
| | - M H Park
- Ewha Womans University Seoul Hospital, Seoul, South Korea
| | - S S Chung
- Department of Surgery, Ewha Womans University College of Medicine, 260, Gonghang-Daero, Gangseo-Gu, Seoul, 07804, South Korea
| | - R-A Lee
- Department of Surgery, Ewha Womans University College of Medicine, 260, Gonghang-Daero, Gangseo-Gu, Seoul, 07804, South Korea
| | - K H Kim
- Department of Surgery, Ewha Womans University College of Medicine, 260, Gonghang-Daero, Gangseo-Gu, Seoul, 07804, South Korea
| | - G T Noh
- Department of Surgery, Ewha Womans University College of Medicine, 260, Gonghang-Daero, Gangseo-Gu, Seoul, 07804, South Korea.
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Kim TH, Park I, Lee KH, Sim JH, Park MH, Han TH, Paik U, Jang J, Park HB, Kim YH. Investigating the interfacial properties of halide perovskite/TiO x heterostructures for versatile photocatalytic reactions under sunlight. Nanoscale 2023; 15:7710-7714. [PMID: 37051888 DOI: 10.1039/d2nr06840k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Heterostructures of metal halide perovskites and TiOx are efficient photocatalytic materials owing to the combination of the advantages of each compound, specifically the high absorption coefficients and long charge-carrier lifetimes of perovskites, and efficient photocatalytic activity of TiOx. However, chemical reduction of CO2 using PNC/TiOx heterostructures without organic solvents has not been reported yet. Here, we report the first solvent-free reduction of CO2 using amorphous TiOx with embedded colloidal perovskite nanocrystals (PNCs). The combination was obtained by carrying out hydrolysis of titanium butoxide (TBOT) on the PNC surface without high-temperature calcination. We proposed a mechanism involving photoexcited electrons being transferred from PNCs to TBOT, enabling photocatalytic reactions using TiOx under visible-light excitation. We demonstrated efficient visible-light-driven photocatalytic reactions at PNC/TiOx interfaces, specifically with a CO production rate of 30.43 μmol g-1 h-1 and accelerated degradation of organic pollutants under natural sunlight. Our work has provided a simple path toward both efficient CO2 reduction and photocatalytic degradation of organic dyes.
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Affiliation(s)
- Tae Hyung Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
| | - Inho Park
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
| | - Kyeong Ho Lee
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
| | - Jin-Han Sim
- Division of Materials Science and Engineering, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Min-Ho Park
- Department of Materials Science and Engineering, Department of Green Chemistry and Materials Engineering, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul 06978, Republic of Korea
| | - Tae-Hee Han
- Division of Materials Science and Engineering, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Ungyu Paik
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
| | - Jaeyoung Jang
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
| | - Ho Bum Park
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
| | - Young-Hoon Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
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Park MH, Yeo S, Yang SK, Shin D, Kim JH, Choi JH, Lee WJ. Analysis and forecasting of national marine litter based on coastal data in South Korea from 2009 to 2021. Mar Pollut Bull 2023; 189:114803. [PMID: 36913802 DOI: 10.1016/j.marpolbul.2023.114803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 03/01/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
In this study, statistical analysis and forecasting were performed using coastal litter data of Korea. The analysis indicated that rope and vinyl accounted for the highest proportion of coastal litter items. The statistical analysis of the national coastal litter trends revealed that the greatest concentration of litter was observed during summer months (June-August). To predict the amount of coastal litter per meter, recurrent neural network (RNN)-based models were used. Neural basis expansion analysis for interpretable time series forecasting (N-BEATS) and neural hierarchical interpolation for time series forecasting (N-HiTS), an improved model of N-BEATS recently announced, were used for comparison with RNN-based models. When predictive performance and trend followability were evaluated, overall N-BEATS and N-HiTS outperformed RNN-based models. Furthermore, we found that average of N-BEATS and N-HiTS models yielded better results than using one model.
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Affiliation(s)
- Min-Ho Park
- Division of Marine Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea; Interdisciplinary Major of Maritime and AI Convergence, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Siljung Yeo
- Division of Marine Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Seung-Kwon Yang
- Korea Institute of Maritime and Fisheries Technology, Busan 49111, Republic of Korea
| | - Donguk Shin
- Korea Institute of Maritime and Fisheries Technology, Busan 49111, Republic of Korea
| | - Jeong-Hwan Kim
- Department of Naval Architecture and Offshore Engineering, Dong-A University, Busan 49315, Republic of Korea
| | - Jae-Hyuk Choi
- Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Won-Ju Lee
- Interdisciplinary Major of Maritime and AI Convergence, Korea Maritime and Ocean University, Busan 49112, Republic of Korea; Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea.
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Miller K, Gannon MR, Medina J, Clements K, Dodwell D, Horgan K, Park MH, Cromwell DA. The Association Between Survival and Receipt of Post-mastectomy Radiotherapy According to Age at Diagnosis Among Women With Early Invasive Breast Cancer: A Population-Based Cohort Study. Clin Oncol (R Coll Radiol) 2023; 35:e265-e277. [PMID: 36764877 DOI: 10.1016/j.clon.2023.01.008] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 11/08/2022] [Accepted: 01/16/2023] [Indexed: 01/25/2023]
Abstract
AIMS Clinical trials of post-mastectomy radiotherapy (PMRT) for early invasive breast cancer (EIBC) have included few older women. This study examined whether the association between overall survival or breast cancer-specific survival (BCSS) and receipt of PMRT for EIBC altered with age. MATERIALS AND METHODS The study used patient-level linked cancer registration, routine hospital and radiotherapy data for England and Wales. It included 31 243 women aged ≥50 years diagnosed between 2014 and 2018 with low- (T1-2N0), intermediate- (T3N0/T1-2N1) or high-risk (T1-2N2/T3N1-2) EIBC who received a mastectomy within 12 months from diagnosis. Patterns of survival were analysed using a landmark approach. Associations between overall survival/BCSS and PMRT in each risk group were analysed with flexible parametric survival models, which included patient and tumour factors; whether the association between PMRT and overall survival/BCSS varied by age was assessed using interaction terms. RESULTS Among 4711 women with high-risk EIBC, 86% had PMRT. Five-year overall survival was 70.5% and BCSS was 79.3%. Receipt of PMRT was associated with improved overall survival [adjusted hazard ratio (aHR) 0.75, 95% confidence interval 0.64-0.87] and BCSS (aHR 0.78, 95% confidence interval 0.65-0.95) compared with women who did not have PMRT; associations did not vary by age (overall survival, P-value for interaction term = 0.141; BCSS, P = 0.077). Among 10 814 women with intermediate-risk EIBC, 59% had PMRT; 5-year overall survival was 78.4% and BCSS was 88.0%. No association was found between overall survival (aHR 1.01, 95% confidence interval 0.92-1.11) or BCSS (aHR 1.16, 95% confidence interval 1.01-1.32) and PMRT. There was statistical evidence of a small change in the association with age for overall survival (P = 0.007), although differences in relative survival were minimal, but not for BCSS (P = 0.362). CONCLUSIONS The association between PMRT and overall survival/BCSS does not appear to be modified by age among women with high- or intermediate-risk EIBC and, thus, treatment recommendations should not be modified on the basis of age alone.
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Affiliation(s)
- K Miller
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK.
| | - M R Gannon
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK
| | - J Medina
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK
| | - K Clements
- National Cancer Registration and Analysis Service, NHS Digital, Birmingham, UK
| | - D Dodwell
- Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - K Horgan
- Department of Breast Surgery, St James's University Hospital, Leeds, UK
| | - M H Park
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK
| | - D A Cromwell
- Clinical Effectiveness Unit, The Royal College of Surgeons of England, London, UK; Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK
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Lee JM, Park MH, Park BS, Oh MK. Production of S-methyl-methionine using engineered Saccharomyces cerevisiae sake K6. J Ind Microbiol Biotechnol 2023; 50:kuad026. [PMID: 37653437 PMCID: PMC10495038 DOI: 10.1093/jimb/kuad026] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 08/29/2023] [Indexed: 09/02/2023]
Abstract
S-methyl-methionine (SMM), also known as vitamin U, is an important food supplement produced by various plants. In this study, we attempted to produce it in an engineered microorganism, Saccharomyces cerevisiae, by introducing an MMT gene encoding a methionine S-methyltransferase from Arabidopsis thaliana. The S. cerevisiae sake K6 strain, which is a Generally Recognized as Safe (GRAS) strain, was chosen as the host because it produces a significant amount of S-adenosylmethionine (SAM), a precursor of SMM. To increase SMM production in the host, MHT1 and SAM4 genes encoding homocysteine S-methyltransferase were knocked out to prevent SMM degradation. Additionally, MMP1, which encodes S-methyl-methionine permease, was deleted to prevent SMM from being imported into the cell. Finally, ACS2 gene encoding acetyl-CoA synthase was overexpressed, and MLS1 gene encoding malate synthase was deleted to increase SAM availability. Using the engineered strain, 1.92 g/L of SMM was produced by fed-batch fermentation. ONE-SENTENCE SUMMARY Introducing a plant-derived MMT gene encoding methionine S-methyltransferase into engineered Saccharomyces cerevisiae sake K6 allowed microbial production of S-methyl-methionine (SMM).
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Affiliation(s)
- Jun-Min Lee
- Department of Chemical & Biological Engineering, Korea University, Seoul 136-763, Korea
| | - Min-Ho Park
- Department of Chemical & Biological Engineering, Korea University, Seoul 136-763, Korea
| | - Bu-Soo Park
- Department of Chemical & Biological Engineering, Korea University, Seoul 136-763, Korea
- Samyang Corp. 295 Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 13488, Republic of Korea
| | - Min-Kyu Oh
- Department of Chemical & Biological Engineering, Korea University, Seoul 136-763, Korea
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Park MH, Chakraborty S, Vuong QD, Noh DH, Lee JW, Lee JU, Choi JH, Lee WJ. Anomaly Detection Based on Time Series Data of Hydraulic Accumulator. Sensors (Basel) 2022; 22:s22239428. [PMID: 36502152 PMCID: PMC9739721 DOI: 10.3390/s22239428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 11/28/2022] [Accepted: 11/30/2022] [Indexed: 05/13/2023]
Abstract
Although hydraulic accumulators play a vital role in the hydraulic system, they face the challenges of being broken by continuous abnormal pulsating pressure which occurs due to the malfunction of hydraulic systems. Hence, this study develops anomaly detection algorithms to detect abnormalities of pulsating pressure for hydraulic accumulators. A digital pressure sensor was installed in a hydraulic accumulator to acquire the pulsating pressure data. Six anomaly detection algorithms were developed based on the acquired data. A threshold averaging algorithm over a period based on the averaged maximum/minimum thresholds detected anomalies 2.5 h before the hydraulic accumulator failure. In the support vector machine (SVM) and XGBoost model that distinguish normal and abnormal pulsating pressure data, the SVM model had an accuracy of 0.8571 on the test set and the XGBoost model had an accuracy of 0.8857. In a convolutional neural network (CNN) and CNN autoencoder model trained with normal and abnormal pulsating pressure images, the CNN model had an accuracy of 0.9714, and the CNN autoencoder model correctly detected the 8 abnormal images out of 11 abnormal images. The long short-term memory (LSTM) autoencoder model detected 36 abnormal data points in the test set.
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Affiliation(s)
- Min-Ho Park
- Division of Marine Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
- Interdisciplinary Major of Maritime and AI Convergence, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | | | - Quang Dao Vuong
- Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Dong-Hyeon Noh
- Hwajin Enterprise Co., Ltd., 25, Mieumsandan 2-ro, Gangseo-gu, Busan 46748, Republic of Korea
| | - Ji-Woong Lee
- Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Jae-Ung Lee
- Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Jae-Hyuk Choi
- Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Won-Ju Lee
- Interdisciplinary Major of Maritime and AI Convergence, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
- Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
- Correspondence: ; Tel.: +82-51-410-4262
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Jia G, Ping J, Shu X, Yang Y, Cai Q, Kweon SS, Choi JY, Kubo M, Park SK, Bolla MK, Dennis J, Wang Q, Guo X, Li B, Tao R, Aronson KJ, Chan TL, Gao YT, Hartman M, Ho WK, Ito H, Iwasaki M, Iwata H, John EM, Kasuga Y, Kim MK, Kurian AW, Kwong A, Li J, Lophatananon A, Low SK, Mariapun S, Matsuda K, Matsuo K, Muir K, Noh DY, Park B, Park MH, Shen CY, Shin MH, Spinelli JJ, Takahashi A, Tseng C, Tsugane S, Wu AH, Yamaji T, Zheng Y, Dunning AM, Pharoah PDP, Teo SH, Kang D, Easton DF, Simard J, Shu XO, Long J, Zheng W. Genome- and transcriptome-wide association studies of 386,000 Asian and European-ancestry women provide new insights into breast cancer genetics. Am J Hum Genet 2022; 109:2185-2195. [PMID: 36356581 PMCID: PMC9748250 DOI: 10.1016/j.ajhg.2022.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [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: 05/05/2022] [Accepted: 10/20/2022] [Indexed: 11/10/2022] Open
Abstract
By combining data from 160,500 individuals with breast cancer and 226,196 controls of Asian and European ancestry, we conducted genome- and transcriptome-wide association studies of breast cancer. We identified 222 genetic risk loci and 137 genes that were associated with breast cancer risk at a p < 5.0 × 10-8 and a Bonferroni-corrected p < 4.6 × 10-6, respectively. Of them, 32 loci and 15 genes showed a significantly different association between ER-positive and ER-negative breast cancer after Bonferroni correction. Significant ancestral differences in risk variant allele frequencies and their association strengths with breast cancer risk were identified. Of the significant associations identified in this study, 17 loci and 14 genes are located 1Mb away from any of the previously reported breast cancer risk variants. Pathways analyses including 221 putative risk genes identified multiple signaling pathways that may play a significant role in the development of breast cancer. Our study provides a comprehensive understanding of and new biological insights into the genetics of this common malignancy.
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Affiliation(s)
- Guochong Jia
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Jie Ping
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Xiang Shu
- Department of Epidemiology & Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Yaohua Yang
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Qiuyin Cai
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Sun-Seog Kweon
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea; Jeonnam Regional Cancer Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Ji-Yeob Choi
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea; Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea; Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Michiaki Kubo
- RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Sue K Park
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea; Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea; Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Manjeet K Bolla
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Joe Dennis
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Qin Wang
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Xingyi Guo
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Bingshan Li
- Department of Molecular Physiology & Biophysics, Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN, USA
| | - Ran Tao
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, USA; Vanderbilt Genetics Institute, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Kristan J Aronson
- Department of Public Health Sciences and Queen's Cancer Research Institute, Queen's University, Kingston, ON, Canada
| | - Tsun L Chan
- Hong Kong Hereditary Breast Cancer Family Registry, Hong Kong SAR, China; Department of Molecular Pathology, Hong Kong Sanatorium & Hospital, Hong Kong SAR, China
| | - Yu-Tang Gao
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Mikael Hartman
- Department of Surgery, National University Hospital, Singapore, Singapore; Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore; Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Weang Kee Ho
- Department of Applied Mathematics, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
| | - Hidemi Ito
- Division of Cancer Information and Control, Aichi Cancer Center Research Institute, Nagoya, Japan; Department of Descriptive Cancer Epidemiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Motoki Iwasaki
- Division of Epidemiology, National Cancer Center Institute for Cancer Control, Tokyo, Japan
| | - Hiroji Iwata
- Department of Breast Oncology, Aichi Cancer Center, Nagoya, Aichi, Japan
| | - Esther M John
- Departments of Epidemiology, Cancer Prevention Institute of California, Fremont, CA, USA; Departments of Health Research and Policy, School of Medicine, Stanford University, Stanford, CA, USA; Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Yoshio Kasuga
- Department of Surgery, Nagano Matsushiro General Hospital, Nagano, Japan
| | - Mi-Kyung Kim
- Division of Cancer Epidemiology and Management, National Cancer Center, Goyang, Korea
| | - Allison W Kurian
- Departments of Health Research and Policy, School of Medicine, Stanford University, Stanford, CA, USA
| | - Ava Kwong
- Hong Kong Hereditary Breast Cancer Family Registry, Hong Kong SAR, China; Department of Surgery, University of Hong Kong, Hong Kong SAR, China; Department of Surgery, Hong Kong Sanatorium & Hospital, Hong Kong SAR, China
| | - Jingmei Li
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore; Human Genetics, Genome Institute of Singapore, Singapore, Singapore; Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Artitaya Lophatananon
- Division of Health Sciences, Warwick Medical School, Warwick University, Coventry, UK; Institute of Population Health, University of Manchester, Manchester, UK
| | - Siew-Kee Low
- RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | | | - Koichi Matsuda
- Laboratory of Clinical Genome Sequencing, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Keitaro Matsuo
- Division of Cancer Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan; Division of Cancer Epidemiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kenneth Muir
- Division of Health Sciences, Warwick Medical School, Warwick University, Coventry, UK; Institute of Population Health, University of Manchester, Manchester, UK
| | - Dong-Young Noh
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea; Department of Surgery, Seoul National University Hospital, Seoul, South Korea
| | - Boyoung Park
- Department of Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - Min-Ho Park
- Department of Surgery, Chonnam National University Medical School, Gwangju, Korea
| | - Chen-Yang Shen
- College of Public Health, China Medical University, Taichong, Taiwan; Taiwan Biobank, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Min-Ho Shin
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea
| | - John J Spinelli
- Department of Cancer Control Research, British Columbia Cancer Agency, Vancouver, BC, Canada; School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
| | - Atsushi Takahashi
- RIKEN Center for Integrative Medical Sciences, Yokohama, Japan; Department of Genomic Medicine, Research Institute, National Cerebral and Cardiovascular Center, Suita, Osaka, Japan
| | - Chiuchen Tseng
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Shoichiro Tsugane
- National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan
| | - Anna H Wu
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Taiki Yamaji
- Division of Epidemiology, National Cancer Center Institute for Cancer Control, Tokyo, Japan
| | - Ying Zheng
- Shanghai Municipal Center for Disease Control and Prevention, Shanghai, China
| | - Alison M Dunning
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, UK
| | - Paul D P Pharoah
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK; Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, UK
| | - Soo-Hwang Teo
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia; Department of Surgery, Faculty of Medicine, University Malaya, Kuala Lumpar, Malaysia
| | - Daehee Kang
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea; Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea; Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Korea; Institute of Environmental Medicine, Seoul National University Medical Research Center, Seoul, Korea
| | - Douglas F Easton
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK; Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, UK
| | - Jacques Simard
- Genomics Center, Centre Hospitalier Universitaire de Québec - Université Laval, Research Center, Québec City, QC, Canada
| | - Xiao-Ou Shu
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Jirong Long
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA
| | - Wei Zheng
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, 2525 West End Avenue, Suite 800, Nashville, TN, USA.
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Fitzsimons KJ, Hamilton MJ, van der Meulen J, Medina J, Wahedally M, Park MH, Russell C. Range and Frequency of Congenital Malformations Among Children With Cleft Lip and/or Palate. Cleft Palate Craniofac J 2022:10556656221089160. [PMID: 35382604 DOI: 10.1177/10556656221089160] [Citation(s) in RCA: 3] [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] [Indexed: 11/16/2022] Open
Abstract
To assess the range and frequency of additional congenital malformations identified among children born alive with CL/P. Analysis of patient-level data from a national registry of cleft births linked to national administrative data of hospital admissions. National Health Service, England. Children born between 2000 and 2012 receiving cleft care in English NHS hospitals. The proportion of children with ICD-10 codes for additional congenital malformations, according to cleft type. The study included 9403 children. Of these 2114 (22.5%) had CL±A, 4509 (48.0%) had CP, 1896 (20.2%) had UCLP, and 884 (9.4%) had BCLP. A total of 3653 (38.8%) children had additional congenital malformations documented in their hospital admission records. The prevalence of additional congenital malformations was greatest among children with CP (53.0%), followed by those with BCLP (33.5%), UCLP (26.3%), and then CL±A (22.2%) (P < .001). Among those with UCLP, children with right-sided clefts were more likely to have additional malformations than those with left-sided clefts (31.6% vs 23.0%, P < .001). Malformations of the skeletal system and circulatory system were most common, affecting 10.5% and 10.2% of the included children, respectively. A total of 16.8% of children had additional congenital malformations affecting 2 or more structural systems. Congenital malformations are common among children born alive with a cleft, affecting over half of some cleft subgroups. Given the frequency of certain structural malformations, clinicians should consider standardized screening for these children. Establishing good links with pediatric and genetic services is recommended.
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Affiliation(s)
- K J Fitzsimons
- Clinical Effectiveness Unit, 14211Royal College of Surgeons of England, London, UK
| | - M J Hamilton
- West of Scotland Centre for Genomic Medicine, 473300Queen Elizabeth University Hospital, Glasgow, UK
| | - J van der Meulen
- Department of Health Services Research and Policy, 4906London School of Hygiene and Tropical Medicine, London, UK
| | - J Medina
- Clinical Effectiveness Unit, 14211Royal College of Surgeons of England, London, UK
| | - Mah Wahedally
- Clinical Effectiveness Unit, 14211Royal College of Surgeons of England, London, UK
| | - M H Park
- Department of Health Services Research and Policy, 4906London School of Hygiene and Tropical Medicine, London, UK
| | - Cjh Russell
- 59842Royal Hospital for Children, 473300Queen Elizabeth University Hospital, Glasgow, UK
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12
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Ryu YJ, Kwon SY, Lim SY, Na YM, Park MH. Predictive Factors for Skip Lymph Node Metastasis and Their Implication on Recurrence in Papillary Thyroid Carcinoma. Biomedicines 2022; 10:biomedicines10010179. [PMID: 35052858 PMCID: PMC8773669 DOI: 10.3390/biomedicines10010179] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 12/20/2021] [Revised: 01/12/2022] [Accepted: 01/14/2022] [Indexed: 11/16/2022] Open
Abstract
Skip lymph node (LN) metastases in papillary thyroid carcinoma (PTC) belong to N1b classification in the absence of central neck LN involvement. This study aimed to evaluate the predictive factors of skip metastases and their impact on recurrence in PTC patients with pN1b. A total of 334 PTC patients who underwent total thyroidectomy with LN dissection (central and lateral neck compartment) followed by radioactive iodine ablation were included. Patients with skip metastases tended to have a small primary tumor (≤1 cm) and single lateral neck level involvement. Tumor size ≤ 1 cm was an important predictive factor for skip metastases. Univariate analysis for recurrence showed that patients with a central LN ratio > 0.68, lateral LN ratio > 0.21, and stimulated thyroglobulin (Tg) levels > 7.3 ng/mL had shorter RFS (recurrence-free survival). The stimulated Tg level was associated with shorter RFS on multivariate analysis (>7.3 vs. ≤7.3 ng/mL; hazard ratio, 4.226; 95% confidence interval, 2.226−8.022; p < 0.001). Although patients with skip metastases tended to have a small primary tumor and lower burden of lateral neck LN involvement, there was no association between skip metastases and RFS in PTC with pN1b. Stimulated Tg level was a strong predictor of recurrence.
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Affiliation(s)
- Young-Jae Ryu
- Department of Surgery, Chonnam National University Medical School, 322 Seoyang-ro Hwasun-eup, Hwasun-gun, Gwangju 58128, Korea; (Y.-J.R.); (S.-Y.L.); (Y.-M.N.); (M.-H.P.)
| | - Seong-Young Kwon
- Department of Nuclear Medicine, Chonnam National University Medical School, 322 Seoyang-ro Hwasun-eup, Hwasun-gun, Gwangju 58128, Korea
- Correspondence: ; Tel.: +82-61-379-7273
| | - Soo-Young Lim
- Department of Surgery, Chonnam National University Medical School, 322 Seoyang-ro Hwasun-eup, Hwasun-gun, Gwangju 58128, Korea; (Y.-J.R.); (S.-Y.L.); (Y.-M.N.); (M.-H.P.)
| | - Yong-Min Na
- Department of Surgery, Chonnam National University Medical School, 322 Seoyang-ro Hwasun-eup, Hwasun-gun, Gwangju 58128, Korea; (Y.-J.R.); (S.-Y.L.); (Y.-M.N.); (M.-H.P.)
| | - Min-Ho Park
- Department of Surgery, Chonnam National University Medical School, 322 Seoyang-ro Hwasun-eup, Hwasun-gun, Gwangju 58128, Korea; (Y.-J.R.); (S.-Y.L.); (Y.-M.N.); (M.-H.P.)
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13
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Na YM, Cho JS, Park MH. Levothyroxine Cessation After Thyroid Lobectomy for Papillary Thyroid Cancer Can Be Achieved at the Same Rate as that for Benign Tumors Regardless of the Duration of Thyroid-stimulating Hormone Suppression. Anticancer Res 2021; 41:5713-5721. [PMID: 34732444 DOI: 10.21873/anticanres.15387] [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: 08/02/2021] [Revised: 10/14/2021] [Accepted: 10/18/2021] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM Thyroid lobectomy may cause post-lobectomy hypothyroidism. We investigated the difference in levothyroxine (LT4) supplementation and cessation between patients with benign disease and those with papillary thyroid carcinoma (PTC) and found that the rate of LT4 cessation could be decreased after thyroid-stimulating hormone (TSH) suppression in PTC. PATIENTS AND METHODS We retrospectively reviewed 88 patients with benign tumor and 463 patients with PTC and investigated the risk factors for LT4 supplementation after thyroid lobectomy. RESULTS During the median follow-up of 73.0 months, 207 (37.6%) patients maintained the euthyroid state, while 344 (62.4%) patients continued LT4 supplementation for LT4 replacement or TSH suppression. In patients with benign tumors, only high pre-TSH level (>1.98 mIU/l) was a significant risk factor (odds ratio [OR]=10.09). However, in patients with PTC, pre-TSH level ≥1.98 mIU/l (OR=3.28), pregnancy planning (OR=2.97), and age ≥42.5 years (OR=1.94) were significant risk factors. Moreover, the most potent risk factor was tumor aggressiveness (OR=4.00), which was found to be more significant than high pre-TSH. The overall rate of LT4 cessation in all patients was 37.6%; however, in the 303 patients who underwent the LT4-Off trial, there was no difference in the rate in the benign tumor, low-risk PTC, and intermediate-risk PTC groups (66.2%, 68.8%, and 70.8%, respectively; p=0.886). CONCLUSION When post-lobectomy TSH levels were adequate and the risk of recurrence was reduced, LT4 cessation in PTC could be achieved at the same rate as that in benign tumors, regardless of the duration of TSH suppression.
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Affiliation(s)
- Yong-Min Na
- Department of Surgery, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea
| | - Jin-Seong Cho
- Department of Surgery, Chonnam National University Hospital, Gwangju, Republic of Korea; .,Department of Surgery, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Min-Ho Park
- Department of Surgery, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea.,Department of Surgery, Chonnam National University Medical School, Gwangju, Republic of Korea
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Rajagopal R, Park MH, Subramanian Y, Jung YJ, Ryu KS. Synthesis and electrochemical performance of antiperovskite-like Li3SI solid electrolyte. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115477] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Park MH, Jang SJ, Choi SH. Osteogenic Evaluation of Hydroxyapatite Scaffold Loaded With Dexamethasone in Femoral Drill Holes. In Vivo 2021; 34:1857-1862. [PMID: 32606155 DOI: 10.21873/invivo.11980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/06/2020] [Accepted: 04/14/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM Many cases of bone damage are due to trauma and metabolic diseases. This study aimed to evaluate bone regeneration into a porous hydroxyapatite (HA) scaffold using dexamethasone (DM)-loaded polymeric microspheres. MATERIALS AND METHODS Four adult dogs were used to evaluate the in vivo performance of DM-loaded microspheres immobilized on the surfaces of porous HA scaffolds. Two 5-mm drill holes were created in both the left and right femurs of each dog. The experimental groups included a control group (drill holes filled with HA scaffold alone), a DM 20 group (holes filled with DM-loaded HA scaffold with 20 mg DM per scaffold), and a DM 100 group (hole filled with DM-loaded HA scaffold with 100 mg DM per scaffold). Resulting bone volume percentages and bone mineral densities were calculated by examing micro-computed tomographic (CT) images. RESULTS The DM-loaded HA scaffold groups showed a gradual periosteal reaction two weeks after insertion of the HA scaffold into the femoral drill holes. Four weeks after HA scaffold insertion, the periosteal reaction in the femoral drill holes became denser. Eight weeks after insertion of DM-loaded HA scaffolds, clear images of the scaffold were observed in micro-CT images of the femoral drill hole. The DM 100 group had better bone healing tendencies (bone mineral density, bone mass, trabecular volume, bone surface, and trabecular thickness) than the DM 20 group. CONCLUSION DM-loaded HA scaffolds are suitable platforms for distributing bioactive molecules during osteogenesis in femoral drill holes.
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Affiliation(s)
- Min-Ho Park
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Seok Jin Jang
- Onnuri Animal Medical Center, Cheongju, Republic of Korea
| | - Seok Hwa Choi
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
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Kwon SJ, Ahn S, Heo JM, Kim DJ, Park J, Lee HR, Kim S, Zhou H, Park MH, Kim YH, Lee W, Sun JY, Hong BH, Lee TW. Chemically Robust Indium Tin Oxide/Graphene Anode for Efficient Perovskite Light-Emitting Diodes. ACS Appl Mater Interfaces 2021; 13:9074-9080. [PMID: 33491445 DOI: 10.1021/acsami.0c12939] [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: 06/12/2023]
Abstract
Graphene is an optimal material to be employed as an ionic diffusion barrier because of its outstanding impermeability and chemical robustness. Indium tin oxide (ITO) is often used in perovskite light-emitting diodes (PeLEDs), and it can release indium easily upon exposure to the acidic hole-injection layer so that luminescence can be quenched significantly. Here, we exploit the outstanding impermeability of graphene and use it as a chemical barrier to block the etching that can occur in ITO exposed to an acidic hole-injection layer in PeLEDs. This barrier reduced the luminescence quenching that these metallic species can cause, so the photoluminescence lifetime of perovskite film was substantially higher in devices with ITO and graphene layer (87.9 ns) than in devices that had only an ITO anode (22.1 ns). Luminous current efficiency was also higher in PeLEDs with a graphene barrier (16.4 cd/A) than in those without graphene (9.02 cd/A). Our work demonstrates that graphene can be used as a barrier to reduce the degradation of transparent electrodes by chemical etching in optoelectronic devices.
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Affiliation(s)
- Sung-Joo Kwon
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 790-784, Republic of Korea
| | - Soyeong Ahn
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 790-784, Republic of Korea
| | - Jung-Min Heo
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Dong Jin Kim
- Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jinwoo Park
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hae-Ryung Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sungjin Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Huanyu Zhou
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Min-Ho Park
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Young-Hoon Kim
- Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Wanhee Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeong-Yun Sun
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Byung Hee Hong
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
- Graphene Research Center Advanced Institute of Convergence Technology, Suwon 16229, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Research Institute of Advanced Materials, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Institute of Engineering Research, Nano Systems Institute (NSI), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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17
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Lee BI, Lim JH, Park MH, Shin SH, Byeon JJ, Choi JM, Park SJ, Park MJ, Park Y, Shin YG. Qualification and application of liquid chromatography-quadrupole time-of-flight mass spectrometric method for the determination of carisbamate in rat plasma and prediction of its human pharmacokinetics using physiologically based pharmacokinetic modeling. Transl Clin Pharmacol 2020; 28:147-159. [PMID: 33062628 PMCID: PMC7533164 DOI: 10.12793/tcp.2020.28.e15] [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: 08/03/2020] [Revised: 09/14/2020] [Accepted: 09/17/2020] [Indexed: 11/27/2022] Open
Abstract
Carisbamate is an antiepileptic drug and it also has broad neuroprotective activity and anticonvulsant reaction. In this study, a liquid chromatography-quadrupole time-of-flight mass spectrometric (LC-qTOF-MS) method was developed and applied for the determination of carisbamate in rat plasma to support in vitro and in vivo studies. A quadratic regression (weighted 1/concentration2), with an equation y = ax2 + bx + c, was used to fit calibration curves over the concentration range from 9.05 to 6,600 ng/mL for carisbamate in rat plasma. Preclinical in vitro and in vivo studies of carisbamate have been studied through the developed bioanalytical method. Based on these study results, human pharmacokinetic (PK) profile has been predicted using physiologically based pharmacokinetic (PBPK) modeling. The PBPK model was optimized and validated by using the in vitro and in vivo data. The human PK of carisbamate after oral dosing of 750 mg was simulated by using this validated PBPK model. The human PK parameters and profiles predicted from the validated PBPK model were similar to the clinical data. This PBPK model developed from the preclinical data for carisbamate would be useful for predicting the PK of carisbamate in various clinical settings.
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Affiliation(s)
- Byeong Ill Lee
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Jeong-Hyeon Lim
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Min-Ho Park
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Jin-Ju Byeon
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Jang-Mi Choi
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Seo-Jin Park
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Min-Jae Park
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Yuri Park
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Young G Shin
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
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18
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Han JH, Jang KW, Park MH, Myung CS. Garcinia cambogia suppresses adipogenesis in 3T3-L1 cells by inhibiting p90RSK and Stat3 activation during mitotic clonal expansion. J Cell Physiol 2020; 236:1822-1839. [PMID: 32716094 DOI: 10.1002/jcp.29964] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 07/09/2020] [Accepted: 07/13/2020] [Indexed: 01/12/2023]
Abstract
Obesity is associated with an increase in adipose tissue, which is mediated by hyperplasia and hypertrophy. Therefore, inhibiting cell proliferation during mitotic clonal expansion (MCE) is one of the major strategies for preventing obesity. The antagonistic effects of Garcinia cambogia (G. cambogia) on obesity have been studied in animal experimental models. However, the effects of G. cambogia extract on MCE, and the underlying molecular mechanisms, are poorly understood. In this study, 3T3-L1 cells were used to investigate whether G. cambogia extract affected cell proliferation during MCE and to identify target molecules for any anti-adipogenic activity. G. cambogia extract suppressed isobutylmethylxanthine and dexamethasone-and-insulin (MDI)-induced adipogenesis at an early stage by attenuating MCE. In G. cambogia extract-treated preadipocytes, MDI-induced cell proliferation and cell cycle progression were inhibited by G0 /G1 arrest due to an increase in p21 and p27 expression, and inhibition of cyclin-dependent kinase 2, cyclin E1 expression, and retinoblastoma (Rb) phosphorylation. In addition, the MDI-induced phosphorylation and subsequent translocation into the nucleus of p90 ribosomal S6 kinase (p90RSK) and signal transducer and activator of transcription (Stat) 3 were suppressed. Specific inhibitors of p90RSK (FMK) and Stat3 (stattic) regulated cell proliferation and adipogenesis. In conclusion, this study demonstrated that G. cambogia extract inhibited MCE by regulating p90RSK, Stat3, and cell cycle proteins, leading to G0 /G1 arrest. These findings provide new insight into the mechanism by which G. cambogia suppresses adipocyte differentiation and show that p90RSK is critical for adipogenesis as a new molecular target.
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Affiliation(s)
- Joo-Hui Han
- Department of Pharmacology, College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Keun-Woo Jang
- Department of Pharmacology, College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Min-Ho Park
- Institute of Drug Research and Development, College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Chang-Seon Myung
- Department of Pharmacology, College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
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19
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Kim H, Kim JS, Heo JM, Pei M, Park IH, Liu Z, Yun HJ, Park MH, Jeong SH, Kim YH, Park JW, Oveisi E, Nagane S, Sadhanala A, Zhang L, Kweon JJ, Lee SK, Yang H, Jang HM, Friend RH, Loh KP, Nazeeruddin MK, Park NG, Lee TW. Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot. Nat Commun 2020; 11:3378. [PMID: 32632144 PMCID: PMC7338442 DOI: 10.1038/s41467-020-17072-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [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: 08/27/2019] [Accepted: 06/02/2020] [Indexed: 12/03/2022] Open
Abstract
Perovskite light-emitting diodes (PeLEDs) based on three-dimensional (3D) polycrystalline perovskites suffer from ion migration, which causes overshoot of luminance over time during operation and reduces its operational lifetime. Here, we demonstrate 3D/2D hybrid PeLEDs with extremely reduced luminance overshoot and 21 times longer operational lifetime than 3D PeLEDs. The luminance overshoot ratio of 3D/2D hybrid PeLED is only 7.4% which is greatly lower than that of 3D PeLED (150.4%). The 3D/2D hybrid perovskite is obtained by adding a small amount of neutral benzylamine to methylammonium lead bromide, which induces a proton transfer from methylammonium to benzylamine and enables crystallization of 2D perovskite without destroying the 3D phase. Benzylammonium in the perovskite lattice suppresses formation of deep-trap states and ion migration, thereby enhances both operating stability and luminous efficiency based on its retardation effect in reorientation. Ion migration can induce overshoot of luminance in normal 3D perovskite light-emitting diode devices and results in reduced lifetime. Here Kim et al. show that the ion migration and overshoot can be suppressed in 3D/2D hybrid perovskites, leading to 21 times longer operational lifetime.
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Affiliation(s)
- Hobeom Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Joo Sung Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jung-Min Heo
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Mingyuan Pei
- Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - In-Hyeok Park
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
| | - Zhun Liu
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Hyung Joong Yun
- Research Center for Materials Analysis, Korea Basic Science Institute (KBSI), Daejeon, 34133, Republic of Korea
| | - Min-Ho Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Su-Hun Jeong
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Young-Hoon Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jin-Woo Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Emad Oveisi
- Interdisciplinary Centre for Electron Microscopy (CIME), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1951, Switzerland
| | - Satyawan Nagane
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Aditya Sadhanala
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.,Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK.,Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Lijun Zhang
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Jin Jung Kweon
- School of Earth and Environmental Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Sung Keun Lee
- School of Earth and Environmental Sciences, Seoul National University, Seoul, 08826, Republic of Korea.,Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hoichang Yang
- Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Hyun Myung Jang
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - Richard H Friend
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Kian Ping Loh
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
| | - Mohammad Khaja Nazeeruddin
- Group for Molecular Engineering of Function Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Sion, CH-1951, Switzerland
| | - Nam-Gyu Park
- Department of Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea. .,School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826, Republic of Korea. .,Institute of Engineering Research, Research Institute of Advanced Materials, Nano Systems Institute (NSI), Seoul National University, Seoul, 08826, Republic of Korea.
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20
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Ahn S, Han TH, Maleski K, Song J, Kim YH, Park MH, Zhou H, Yoo S, Gogotsi Y, Lee TW. A 2D Titanium Carbide MXene Flexible Electrode for High-Efficiency Light-Emitting Diodes. Adv Mater 2020; 32:e2000919. [PMID: 32350958 DOI: 10.1002/adma.202000919] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/12/2020] [Accepted: 03/24/2020] [Indexed: 05/21/2023]
Abstract
Although several transparent conducting materials such as carbon nanotubes, graphene, and conducting polymers have been intensively explored as flexible electrodes in optoelectronic devices, their insufficient electrical conductivity, low work function, and complicated electrode fabrication processes have limited their practical use. Herein, a 2D titanium carbide (Ti3 C2 ) MXene film with transparent conducting electrode (TCE) properties, including high electrical conductivity (≈11 670 S cm-1 ) and high work function (≈5.1 eV), which are achieved by combining a simple solution processing with modulation of surface composition, is described. A chemical neutralization strategy of a conducting-polymer hole-injection layer is used to prevent detrimental surface oxidation and resulting degradation of the electrode film. Use of the MXene electrode in an organic light-emitting diode leads to a current efficiency of ≈102.0 cd A-1 and an external quantum efficiency of ≈28.5% ph/el, which agree well with the theoretical maximum values from optical simulations. The results demonstrate the strong potential of MXene as a solution-processable electrode in optoelectronic devices and provide a guideline for use of MXenes as TCEs in low-cost flexible optoelectronic devices.
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Affiliation(s)
- Soyeong Ahn
- Department of Materials Science and Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Tae-Hee Han
- Department of Materials Science and Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Kathleen Maleski
- A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA, 19104, USA
| | - Jinouk Song
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Young-Hoon Kim
- Department of Materials Science and Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Min-Ho Park
- Department of Materials Science and Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Huanyu Zhou
- Department of Materials Science and Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seunghyup Yoo
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Yury Gogotsi
- A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA, 19104, USA
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
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21
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Lee BI, Park MH, Choi J, Shin SH, Byeon JJ, Park Y, Shin YG. Liquid chromatography-high resolution mass spectrometric method for the quantification of monomethyl auristatin E (MMAE) and its preclinical pharmacokinetics. Biomed Chromatogr 2020; 34:e4855. [PMID: 32304111 DOI: 10.1002/bmc.4855] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 04/04/2020] [Accepted: 04/10/2020] [Indexed: 01/29/2023]
Abstract
MMAE is a potent antimitotic drug used as payload of an antibody-drug conjugate which shows potent activity in preclinical and clinical studies against a range of lymphomas, leukemia and solid tumors. Liquid chromatography-high resolution mass spectrometric method was developed for the quantification of MMAE and its preclinical pharmacokinetics. The method consisted of protein precipitation using acetonitrile (ACN) for sample preparation and liquid chromatography - quadrupole - time-of-flight - tandem mass spectrometry (LC-qTOF-MS/MS) analysis in the positive ion mode. A quadratic regression (weighted 1/concentration2 ), with an equation y = ax2 + bx + c, was used to fit calibration curves over the concentration range of 1.01-2,200 ng/mL for MMAE. The qualification run met the acceptance criteria of ±25% accuracy and precision values for QC samples. Recovery was 42.84%. The dilution integrity was determined for 5-fold dilution and the accuracy and precision ranged within ±25%. The stability results indicated that MMAE was stable for the following conditions: short-term (4 h), long-term (4 weeks), freeze/thaw (3 cycles) and post-preparative stability (12 h). This qualified method was successfully applied to a pharmacokinetic study of MMAE in rat as a preclinical animal model. The PK results suggest that MMAE has moderate CL and low BA.Also, these results would be helpful in having a comprehensive understanding of the PK characteristics of MMAE and developing ADC in future.
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Affiliation(s)
- Byeong Ill Lee
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Min-Ho Park
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Jangmi Choi
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Jin-Ju Byeon
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Yuri Park
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Young G Shin
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
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22
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Park Y, Park MH, Byeon JJ, Shin SH, Lee BI, Choi JM, Kim N, Park SJ, Park MJ, Lim JH, Shin YG. Assessment of Pharmacokinetics and Metabolism Profiles of SCH 58261 in Rats Using Liquid Chromatography-Mass Spectrometric Method. Molecules 2020; 25:molecules25092209. [PMID: 32397307 PMCID: PMC7248953 DOI: 10.3390/molecules25092209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 04/10/2020] [Revised: 05/01/2020] [Accepted: 05/05/2020] [Indexed: 11/16/2022] Open
Abstract
5-Amino-7-(2-phenylethyl)-2-(2-furyl)-pyrazolo(4,3-e)-1,2,4-triazolo(1,5-c) pyrimidine (SCH 58261) is one of the new chemical entities that has been developed as an adenosine A2A receptor antagonist. Although SCH 58261 has been reported to be beneficial, there is little information about SCH 58261 from a drug metabolism or pharmacokinetics perspective. This study describes the metabolism and pharmacokinetic properties of SCH 58261 in order to understand its behaviors in vivo. Rats were used as the in vivo model species. First, an LC-MS/MS method was developed for the determination of SCH 58261 in rat plasma. A GastroPlus™ simulation, in vitro microsomal metabolic stability, and bile duct-cannulated studies were also performed to understand its pharmacokinetic profile. The parameter sensitivity analysis of GastroPlus™ was used to examine the factors that influence exposure when the drug is orally administered. The factors are as follows: permeability, systemic clearance, renal clearance, and liver first-pass effect. In vitro microsomal metabolic stability indicates how much the drug is metabolized. The extrapolated hepatic clearance value of SCH 58261 was 39.97 mL/min/kg, indicating that the drug is greatly affected by hepatic metabolism. In vitro microsomal metabolite identification studies revealed that metabolites produce oxidized and ketone-formed metabolites via metabolic enzymes in the liver. The bile duct-cannulated rat study, after oral administration of SCH 58261, showed that a significant amount of the drug was excreted in feces. These results imply that the drug is not absorbed well in the body after oral administration. Taken together, SCH 58261 showed quite a low bioavailability when administered orally and this was likely due to significantly limited absorption, as well as high metabolism in vivo.
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23
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Shu X, Long J, Cai Q, Kweon SS, Choi JY, Kubo M, Park SK, Bolla MK, Dennis J, Wang Q, Yang Y, Shi J, Guo X, Li B, Tao R, Aronson KJ, Chan KYK, Chan TL, Gao YT, Hartman M, Kee Ho W, Ito H, Iwasaki M, Iwata H, John EM, Kasuga Y, Soon Khoo U, Kim MK, Kong SY, Kurian AW, Kwong A, Lee ES, Li J, Lophatananon A, Low SK, Mariapun S, Matsuda K, Matsuo K, Muir K, Noh DY, Park B, Park MH, Shen CY, Shin MH, Spinelli JJ, Takahashi A, Tseng C, Tsugane S, Wu AH, Xiang YB, Yamaji T, Zheng Y, Milne RL, Dunning AM, Pharoah PDP, García-Closas M, Teo SH, Shu XO, Kang D, Easton DF, Simard J, Zheng W. Identification of novel breast cancer susceptibility loci in meta-analyses conducted among Asian and European descendants. Nat Commun 2020; 11:1217. [PMID: 32139696 PMCID: PMC7057957 DOI: 10.1038/s41467-020-15046-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 02/10/2020] [Indexed: 02/08/2023] Open
Abstract
Known risk variants explain only a small proportion of breast cancer heritability, particularly in Asian women. To search for additional genetic susceptibility loci for breast cancer, here we perform a meta-analysis of data from genome-wide association studies (GWAS) conducted in Asians (24,206 cases and 24,775 controls) and European descendants (122,977 cases and 105,974 controls). We identified 31 potential novel loci with the lead variant showing an association with breast cancer risk at P < 5 × 10-8. The associations for 10 of these loci were replicated in an independent sample of 16,787 cases and 16,680 controls of Asian women (P < 0.05). In addition, we replicated the associations for 78 of the 166 known risk variants at P < 0.05 in Asians. These findings improve our understanding of breast cancer genetics and etiology and extend previous findings from studies of European descendants to Asian women.
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Affiliation(s)
- Xiang Shu
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Jirong Long
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Qiuyin Cai
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Sun-Seog Kweon
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea
- Jeonnam Regional Cancer Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Ji-Yeob Choi
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Michiaki Kubo
- RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Sue K Park
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Manjeet K Bolla
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Joe Dennis
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Qin Wang
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Yaohua Yang
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Jiajun Shi
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Xingyi Guo
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Bingshan Li
- Department of Molecular Physiology & Biophysics, Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN, USA
| | - Ran Tao
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, USA
- Vanderbilt Genetics Institute, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Kristan J Aronson
- Department of Public Health Sciences and Queen's Cancer Research Institute, Queen's University, Kingston, ON, Canada
| | - Kelvin Y K Chan
- Department of Pathology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China
- Department of Obstetrics & Gynaecology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China
| | - Tsun L Chan
- Hong Kong Hereditary Breast Cancer Family Registry, Hong Kong SAR, China
- Department of Molecular Pathology, Hong Kong Sanatorium & Hospital, Hong Kong SAR, China
| | - Yu-Tang Gao
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Mikael Hartman
- Department of Surgery, National University Hospital, Singapore, Singapore
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Weang Kee Ho
- Department of Applied Mathematics, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
| | - Hidemi Ito
- Division of Cancer Information and Control, Aichi Cancer Center Research Institute, Nagoya, Japan
- Department of Descriptive Cancer Epidemiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Motoki Iwasaki
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Hiroji Iwata
- Department of Breast Oncology, Aichi Cancer Center, Nagoya, Aichi, Japan
| | - Esther M John
- Department of Epidemiology, Cancer Prevention Institute of California, Fremont, CA, USA
- Departments of Health Research and Policy, School of Medicine, Stanford University, California, CA, USA
- Stanford Cancer Institute, Stanford University School of Medicine, California, CA, USA
| | - Yoshio Kasuga
- Department of Surgery, Nagano Matsushiro General Hospital, Nagano, Japan
| | - Ui Soon Khoo
- Department of Pathology, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China
| | - Mi-Kyung Kim
- Division of Cancer Epidemiology and Management, National Cancer Center, Goyang, Korea
| | - Sun-Young Kong
- National Cancer Center Graduate School of Cancer Science and Policy, Goyang, Republic of Korea
- Hospital, National Cancer Center, Goyang, Republic of Korea
- Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Allison W Kurian
- Departments of Health Research and Policy, School of Medicine, Stanford University, California, CA, USA
| | - Ava Kwong
- Hong Kong Hereditary Breast Cancer Family Registry, Hong Kong SAR, China
- Department of Surgery, University of Hong Kong, Hong Kong SAR, China
- Department of Surgery, Hong Kong Sanatorium & Hospital, Hong Kong SAR, China
| | - Eun-Sook Lee
- National Cancer Center Graduate School of Cancer Science and Policy, Goyang, Republic of Korea
- Hospital, National Cancer Center, Goyang, Republic of Korea
- Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Jingmei Li
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Human Genetics, Genome Institute of Singapore, Singapore, Singapore
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Artitaya Lophatananon
- Division of Health Sciences, Warwick Medical School, Warwick University, Coventry, UK
- Institute of Population Health, University of Manchester, Manchester, UK
| | - Siew-Kee Low
- RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | | | - Koichi Matsuda
- Laboratory of Clinical Genome Sequencing, Graduate School of Frontier Sciences, University of Tokyo, Tokyo, Japan
| | - Keitaro Matsuo
- Division of Cancer Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan
- Division of Cancer Epidemiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kenneth Muir
- Division of Health Sciences, Warwick Medical School, Warwick University, Coventry, UK
- Institute of Population Health, University of Manchester, Manchester, UK
| | - Dong-Young Noh
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
- Department of Surgery, Seoul National University Hospital, Seoul, South Korea
| | - Boyoung Park
- Department of Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - Min-Ho Park
- Department of Surgery, Chonnam National University Medical School, Seoul, Korea
| | - Chen-Yang Shen
- College of Public Health, China Medical University, Taichong, Taiwan
- Taiwan Biobank, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Min-Ho Shin
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea
| | - John J Spinelli
- Population Oncology, BC Cancer, Vancouver, BC, Canada
- School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
| | - Atsushi Takahashi
- RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
- Department of Genomic Medicine, Research Institute, National Cerebral and Cardiovascular Center, Suita, Osaka, Japan
| | - Chiuchen Tseng
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Shoichiro Tsugane
- Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Anna H Wu
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Yong-Bing Xiang
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Taiki Yamaji
- Division of Epidemiology, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
| | - Ying Zheng
- Shanghai Municipal Center for Disease Control and Prevention, Shanghai, China
| | - Roger L Milne
- Cancer Epidemiology Division, Cancer Council Victoria, Melbourne, Australia
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Parkville, Victoria, Australia
- Precision Medicine, School of Clinical Sciences at Monash Health, Monash University, Clayton, Victoria, Australia
| | - Alison M Dunning
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, UK
| | - Paul D P Pharoah
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, UK
| | | | - Soo-Hwang Teo
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia
- Department of Surgery, Faculty of Medicine, University Malaya, Kuala Lumpar, Malaysia
| | - Xiao-Ou Shu
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Daehee Kang
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
- Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Korea
- Institute of Environmental Medicine, Seoul National University Medical Research Center, Seoul, Korea
| | - Douglas F Easton
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, UK
| | - Jacques Simard
- Genomics Center, Centre Hospitalier Universitaire de Québec - Université Laval, Research Center, Québec City, QC, Canada
| | - Wei Zheng
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA.
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Byeon JJ, Park MH, Shin SH, Park Y, Lee BI, Choi JM, Kim N, Park SJ, Park MJ, Lim JH, Na YG, Shin YG. In Vitro, In Silico, and In Vivo Assessments of Pharmacokinetic Properties of ZM241385. Molecules 2020; 25:molecules25051106. [PMID: 32131453 PMCID: PMC7179144 DOI: 10.3390/molecules25051106] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 01/08/2020] [Revised: 02/20/2020] [Accepted: 02/26/2020] [Indexed: 11/16/2022] Open
Abstract
Parkinson’s disease is one of the most common neurodegenerative diseases. Adenosine regulates the response to other neurotransmitters in the brain regions related to motor function. In the several subtypes of adenosine receptors, especially, adenosine 2A receptors (A2ARs) are involved in neurodegenerative conditions. ZM241385 is one of the selective non-xanthine A2AR antagonists with high affinity in the nanomolar range. This study describes the in vitro and in vivo pharmacokinetic properties of ZM241385 in rats. A liquid chromatography-quadrupole time-of-flight mass spectrometric (LC-qToF MS) method was developed for the determination of ZM241385 in rat plasma. In vivo IV administration studies showed that ZM241385 was rapidly eliminated in rats. However, the result of in vitro metabolic stability studies showed that ZM241385 had moderate clearance, suggesting that there is an extra clearance pathway in addition to hepatic clearance. In addition, in vivo PO administration studies demonstrated that ZM241385 had low exposure in rats. The results of semi-mass balance studies and the in silico PBPK modeling studies suggested that the low bioavailability of ZM241385 after oral administration in rats was due to the metabolism and by liver, kidney, and gut.
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Park MH, Park JE, Kim MS, Yun JI, Choi K, Lee E, Lee ST. Determination of Medium Condition Effective to Cryopreservation of Primary Spermatogonial Stem Cells Derived from Porcine Neonatal Testes. Cryo Letters 2019; 40:312-321. [PMID: 33966057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
BACKGROUND The superior genetic resources of breeding pigs have been preserved for use through freezing the sperm or semen. However, because there is no way to collect their sperm or semen after depletion, the generation of sperm via the differentiation of porcine spermatogonial stem cells (SSCs) can be an alternative. To date, there have been no reports of techniques customized to in-vitro culture and differentiation into sperm in porcine SSCs. Accordingly, it is important to preserve porcine SSCs with outstanding genetic backgrounds until these technologies are developed. Unfortunately, a protocol for the long-term preservation of porcine SSCs has yet to be reported. OBJECTIVE We tried to develop a cryopreservation medium to preserve the characteristics of undifferentiated porcine SSCs for long-term cryopreservation. MATERIALS AND METHODS SSCs retrieved from porcine testes were freeze-cryopreserved in StemPro-34 medium supplemented with various concentrations of fetal bovine serum (FBS), dimethyl sulfoxide (DMSO), and trehalose; then, after 7 days, the viability and alkaline phosphatase (AP) activity was measured in thawed porcine SSCs. Additionally, we investigated the use of hypotaurine and/or glutathione as antioxidants in the optimized freezing medium for maintaining the viability and AP activity of porcine SSCs during the freezing-cryopreservation-thawing process. RESULTS Porcine SSCs frozen-cryopreserved-thawed in StemPro-34 medium supplemented with 10% (v/v) FBS, 10% (v/v) DMSO, 200 mM trehalose, 5 mM hypotaurine, and 5 mM glutathione showed the highest viability and AP activity. CONCLUSION We optimized a cryopreservation medium that inhibits the loss of viability and the increases differentiation post-thawing of the frozen porcine SSCs.
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Affiliation(s)
- M H Park
- Dept. Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
| | - J E Park
- Dept. Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
| | - M S Kim
- Dept. Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
| | - J I Yun
- Division of Animal Resource Science, Kangwon National University, Chuncheon, Republic of Korea
| | - K Choi
- Optipharm Inc., Cheongju, Republic of Korea
| | - E Lee
- College of Veterinary Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - S T Lee
- Dept. Animal Life Science; Dept. Applied Animal Science, Kangwon National University, Chuncheon, Republic of Korea.
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Kim JY, Bin SI, Kim JM, Lee BS, Oh SM, Park MH. Tear gap and severity of osteoarthritis are associated with meniscal extrusion in degenerative medial meniscus posterior root tears. Orthop Traumatol Surg Res 2019; 105:1395-1399. [PMID: 31575505 DOI: 10.1016/j.otsr.2019.09.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 09/09/2019] [Accepted: 09/12/2019] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Meniscal extrusion is a typical finding of medial meniscus posterior root tear, and it causes loss of the chondroprotective function of the meniscus as well as progression of osteoarthritis; it is therefore associated with poor clinical outcomes. The purpose of this study was to investigate factors associated with meniscal extrusion in degenerative medial meniscus posterior root tear. It was hypothesized that larger displacement from the posterior root insertion was associated with larger meniscal extrusion. MATERIALS AND METHODS One hundred and nine knees with degenerative medial meniscus posterior root tears were retrospectively reviewed. Multiple regression analysis was used to determine whether factors such as age, weight, body mass index, chondral wear at surgery, Kellgren-Lawrence (KL) grade, alignment, tibial slope, and tear gap on performing magnetic resonance imaging (MRI) were associated with meniscal extrusion. Subjects were divided based on the amount of displacement (displaced group: tear gap≥1mm, non-displaced group: tear gap<1mm) to compare meniscal extrusion, chondral wear, and severity of arthritis. RESULTS The mean age of the patients was 58.14±9.64years, the mean absolute extrusion was 4.02±1.22mm, the mean relative percentage of extrusion was 44.53±13.09%, and the mean tear gap was 2.39±2.42mm. Multiple regression analysis showed that absolute extrusion was only associated with tear gap on MRI (B=0.242, p=0.001) and that the relative percentage of extrusion was associated with tear gap (B=1.894, p=0.001) and the K-L grade (B=4.492, p=0.024). Absolute extrusion was significantly higher in the displaced group than in the non-displaced group (4.29±1.04mm vs. 3.01±1.35mm, p=0.001). Relative percentage of extrusion was also significantly higher in the displaced group than in the non-displaced group (47.70±11.44% vs. 36.17±13.65%, p=0.001). The proportion of chondral wear (Outerbridge grade III and IV) on the medial femoral condyle and K-L grade III and IV were significantly greater in the displaced group than in the non-displaced group (76% vs. 53.3%, p=0.023 and 13.9% vs. 0%, p=0.001, respectively). DISCUSSION Greater tear gap is significantly associated with increasing meniscal extrusion in medial meniscus posterior root tear. Additionally, severity of arthritis is significantly associated with increasing relative percentage of extrusion. Chondral wear and severity of arthritis tended to be significantly worse in the displaced group than in the non-displaced group. LEVEL OF EVIDENCE III, comparative retrospective study.
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Affiliation(s)
- Jae-Young Kim
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Seong-Il Bin
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea.
| | - Jong-Min Kim
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Bum-Sik Lee
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Sung-Mok Oh
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Min-Ho Park
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
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Lee BS, Bin SI, Kim JM, Park MH, Lee SM, Bae KH. Partial Meniscectomy for Degenerative Medial Meniscal Root Tears Shows Favorable Outcomes in Well-Aligned, Nonarthritic Knees: Response. Am J Sports Med 2019; 47:NP54-NP57. [PMID: 31365848 DOI: 10.1177/0363546519855356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Kim HN, Shin MH, Lee R, Park MH, Kweon SS. Novel Germline Mutations of BRCA1 and BRCA2 in Korean Familial Breast Cancer Patients. Chonnam Med J 2019; 55:99-103. [PMID: 31161121 PMCID: PMC6536435 DOI: 10.4068/cmj.2019.55.2.99] [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: 04/23/2019] [Revised: 05/03/2019] [Accepted: 05/07/2019] [Indexed: 12/03/2022] Open
Abstract
Breast cancer is the second most common cancer in Korean women. Germline mutations in the BRCA1 and BRCA2 genes cause hereditary breast cancer and are detected in 15–20% of hereditary breast cancer. We investigated the BRCA1 and BRCA2 mutations in 114 familial breast cancer patients using next-generation sequencing. We confirmed 20 different mutations of BRCA1 and BRCA2 in 25 subjects (21.9%). Two such mutations in eight patients were novel (not reported in any variant database or previous study). Six mutations have been reported as disease-causing mutations in public databases. Seven mutations were found only in a single nucleotide polymorphism database and one mutation has been reported in Korea. The BRCA1/2 mutation frequency was similar to that of other studies on familial breast cancer patients in the Korean population. Further studies should examine more cases and mutations of whole exons.
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Affiliation(s)
- Hee Nam Kim
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea
| | - Min-Ho Shin
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea
| | - Ran Lee
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea
| | - Min-Ho Park
- Department of Surgery, Chonnam National University Medical School, Hwasun, Korea
| | - Sun-Seog Kweon
- Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea.,Jeonnam Regional Cancer Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
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Lee BI, Park MH, Shin SH, Byeon JJ, Park Y, Kim N, Choi J, Shin YG. Quantitative Analysis of Tozadenant Using Liquid Chromatography-Mass Spectrometric Method in Rat Plasma and Its Human Pharmacokinetics Prediction Using Physiologically Based Pharmacokinetic Modeling. Molecules 2019; 24:molecules24071295. [PMID: 30987056 PMCID: PMC6479388 DOI: 10.3390/molecules24071295] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 03/06/2019] [Revised: 03/31/2019] [Accepted: 04/01/2019] [Indexed: 12/11/2022] Open
Abstract
Tozadenant is one of the selective adenosine A2a receptor antagonists with a potential to be a new Parkinson's disease (PD) therapeutic drug. In this study, a liquid chromatography-mass spectrometry based bioanalytical method was qualified and applied for the quantitative analysis of tozadenant in rat plasma. A good calibration curve was observed in the range from 1.01 to 2200 ng/mL for tozadenant using a quadratic regression. In vitro and preclinical in vivo pharmacokinetic (PK) properties of tozadenant were studied through the developed bioanalytical methods, and human PK profiles were predicted using physiologically based pharmacokinetic (PBPK) modeling based on these values. The PBPK model was initially optimized using in vitro and in vivo PK data obtained by intravenous administration at a dose of 1 mg/kg in rats. Other in vivo PK data in rats were used to validate the PBPK model. The human PK of tozadenant after oral administration at a dose of 240 mg was simulated by using an optimized and validated PBPK model. The predicted human PK parameters and profiles were similar to the observed clinical data. As a result, optimized PBPK model could reasonably predict the PK in human.
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Affiliation(s)
- Byeong Ill Lee
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Min-Ho Park
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Seok-Ho Shin
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Jin-Ju Byeon
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Yuri Park
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Nahye Kim
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Jangmi Choi
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Young G Shin
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
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Kim SJ, Chae W, Park WH, Park MH, Park EC, Jang SI. The impact of smoking cessation attempts on stress levels. BMC Public Health 2019; 19:267. [PMID: 30841877 PMCID: PMC6402150 DOI: 10.1186/s12889-019-6592-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 02/25/2019] [Indexed: 01/12/2023] Open
Abstract
Background Cigarette smoking is a major health risk, particularly in male South Koreans. Smoking cessation can benefit health; however, the process of quitting smoking is difficult to some smokers and shows its relationship to their stress level. The hypothesis of this study is that who has failed attempts to stop smoking induce more stress than habitual smoking. Methods To test this, the analysis on the association between smoking cessation attempts and stress levels in smokers was performed. The Korean Community Health Survey (2011–2016) data with the total of 488,417 participants’ data were used for this study. Survey data were analyzed using the chi-square test and logistic regression. As the dependent variable, self-reported level of stress was selected. Results Of the subject population, 78.3% (63.3% males, 81.4% females) felt stressed. Among participants who successfully stopped smoking, 73.0% (72.6% males, 78.1% females) reported feeling stressed. In contrast, of those who failed to stop smoking, 83.3% (83.6% males, 86.3% females) reported high stress levels. Among those who did not attempt smoking cessation, 81.1% (81.2% males, 80.3% females) responded that they experienced stress. Those who failed to stop smoking had higher odds of stress than those who did not attempt smoking cessation [odds ratio (OR) 1.11, 95% confidence interval (CI) 1.09–1.14, p < 0.001]. Those who successfully stopped smoking had lower odds of stress than those who did not attempt smoking cessation (OR 0.87, 95% CI 0.86–0.89, p < 0.001). Conclusion The study found an association between unsuccessful smoking cessation and stress level. As the result, people who failed smoking cessation showed higher stress. These data should be considered in health policy recommendations for smokers. Electronic supplementary material The online version of this article (10.1186/s12889-019-6592-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Seong-Jun Kim
- Medical Courses, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Wonjeong Chae
- Department of Public Health, College of Medicine, Yonsei University, Seoul, Republic of Korea.,Institute of Health Services Research, Yonsei University, Seoul, Republic of Korea
| | - Woo-Hyun Park
- Medical Courses, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Min-Ho Park
- Medical Courses, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Eun-Cheol Park
- Institute of Health Services Research, Yonsei University, Seoul, Republic of Korea.,Department of Preventive Medicine and Institute of Health Services Research, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of Korea
| | - Sung-In Jang
- Institute of Health Services Research, Yonsei University, Seoul, Republic of Korea. .,Department of Preventive Medicine and Institute of Health Services Research, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of Korea.
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Lee BS, Bin SI, Kim JM, Park MH, Lee SM, Bae KH. Partial Meniscectomy for Degenerative Medial Meniscal Root Tears Shows Favorable Outcomes in Well-Aligned, Nonarthritic Knees. Am J Sports Med 2019; 47:606-611. [PMID: 30673297 DOI: 10.1177/0363546518819225] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Arthroscopic meniscectomy has been commonly performed for persistent pain caused by degenerative medial meniscal posterior root tears (MMPRTs). However, risk factors that affect long-term outcomes and joint survivorship after meniscectomy are unclear. PURPOSE To identify the risk factors associated with end-stage osteoarthritis after arthroscopic meniscectomy for degenerative MMPRT for middle-aged or elderly patients and to determine the joint survivorship according to the identified risk factors. STUDY DESIGN Case-control study; Level of evidence, 3. METHODS Data from 288 patients (24 male and 264 female), followed for at least 5 years after arthroscopic meniscectomy for degenerative MMPRTs performed between 1999 and 2010, were examined retrospectively. The modified Lysholm score was used for clinical evaluation. Cox proportional hazards regression analysis was used to assess factors that affect joint survivorship when conversion to total knee arthroplasty (TKA) was taken as the endpoint; these factors were age, sex, body mass index (BMI), preoperative tibiofemoral alignment (varus [<2° valgus] vs well-aligned [2°-10° valgus]), preoperative Kellgren-Lawrence grade (0 or 1 vs 2 or 3), and the modified Outerbridge grade of the medial compartment. Kaplan-Meier survival analysis and the log-rank test were used to compare overall survivorship with respect to each significant risk factor. RESULTS Mean age at the time of surgery was 58.9 years (range, 43-78 years). Sixty (20.8%) patients underwent TKA at 7.0 ± 3.6 years (range, 1.1-14.4 years) postoperatively. The mean follow-up time for those who did not undergo TKA was 8.9 ± 2.9 years (range, 4.5-16.5 years). The overall modified Lysholm score improved from 64.4 to 81.3 ( P < .001), but progression of radiographic arthritis was noted in 156 (61.9%) patients ( P < .001) at 2 years postoperatively. Age (hazard ratio [HR] = 1.049), BMI (HR = 1.092), varus alignment (HR = 2.283), and Kellgren-Lawrence grade 2 or higher (HR = 2.960) were significant risk factors for end-stage arthritis requiring TKA. Well-aligned nonarthritic knees (n = 131, 45.5%) survived significantly longer before requiring TKA than did knees with varus alignment or radiographic arthritis ( P < .05). The 5- and 10-year survival rates in these low-risk groups were 97.7% (95% CI, 95.2%-100.2%) and 89.1% (95% CI, 82.4%-95.8%), respectively. CONCLUSION Arthroscopic meniscectomy is an effective treatment for degenerative MMPRTs, with favorable long-term survival in well-aligned nonarthritic knees. However, meniscectomy should be undertaken cautiously in patients with varus alignment and preoperative radiographic osteoarthritis.
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Affiliation(s)
- Bum-Sik Lee
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Republic of Korea
| | - Seong-Il Bin
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Republic of Korea
| | - Jong-Min Kim
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Republic of Korea
| | - Min-Ho Park
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Republic of Korea.,Inbone Hospital, Bucheon, Gyeonggi-do, Republic of Korea
| | - Sang-Min Lee
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Republic of Korea
| | - Kun-Hyung Bae
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, College of Medicine, Seoul, Republic of Korea
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32
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Jang SJ, Park MH, Lee TK, Choi SH. Healing Effect of Platelet-rich Plasma on Decellularized Tracheal Allotransplantation in Rabbits. In Vivo 2018; 32:1443-1447. [PMID: 30348699 DOI: 10.21873/invivo.11397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 09/19/2018] [Accepted: 09/21/2018] [Indexed: 01/30/2023]
Abstract
BACKGROUND/AIM The purpose of this study was to explore the effect of platelet-rich plasma (PRP) on enhancing healing of trachea allotransplantation and confirm the effect via parallel histological and tracheoscopic examinations in seven adult New Zealand White rabbits. MATERIALS AND METHODS Harvested trachea was inserted into recipients with end-to-end anastomosis by a simple interrupted suture. PRP-treated rabbits were treated with 0.5 ml of PRP at the trachea grafts, while control rabbit allografts were treated with 0.5 ml of saline. RESULTS Tracheoscopy of tracheal allografts treated with PRP revealed that the trachea was well healed with no stenosis. The healing effect in the PRP-treated rabbits increased tracheal activity and produced faster trachea regeneration compared to that in control rabbits. There was a good correlation between the subjective symptom of noisy breathing and the objective grading of tracheal stenosis. The tracheal allografts with suture materials appeared slightly pale and looked more like mucosa erosion than normal mucosa at four weeks post-surgery. Contact of trachea-to-transplanted grafts in PRP-treated rabbits was intimate with the surface of the transplanted region and showed high-density epithelialization. After 8 weeks, blood vessels were observed in the transplanted graft in PRP-treated rabbits. Normal epithelium was present in grafts at 8 weeks after allotransplantation. No CD20+ cells were detected in grafts but a few CD3+ cells were observed under the epithelium. CONCLUSION The results of this study show that it is possible to perform tracheal reconstruction in rabbits treated with PRP after tracheal transplantation.
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Affiliation(s)
- Seok Jin Jang
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Min-Ho Park
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Tae-Ki Lee
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Seok Hwa Choi
- Department of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
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33
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Nho JH, Kim SR, Park MH, Kweon SS. Symptom clusters and quality of life in breast cancer survivors after cancer treatment in a tertiary hospital in Korea. Eur J Cancer Care (Engl) 2018; 27:e12919. [PMID: 30253019 DOI: 10.1111/ecc.12919] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 12/18/2017] [Accepted: 08/19/2018] [Indexed: 12/19/2022]
Abstract
We investigated the symptom clusters and effects of symptom clusters on the quality of life of Korean breast cancer survivors. We recruited 241 breast cancer survivors and collected cross-sectional data on their symptoms. To determine inter-relationships among symptoms, a principal component analysis with varimax rotation was performed based on the patient's symptoms (fatigue, nausea/vomiting, pain, dyspnoea, insomnia, appetite loss, constipation, anxiety, depression, systemic therapy side effects, breast symptoms and arm symptoms). The first symptom cluster consisted of psychological (anxiety and depression) and general (appetite loss, fatigue, insomnia and dyspnoea) symptoms, whereas the second symptom cluster consisted of physical (arm symptom, breast symptom, pain and systemic therapy side effects) and gastrointestinal (nausea/vomiting and constipation) symptoms. Subgroup cluster analysis showed that breast cancer survivors with higher-scoring symptoms had significantly poorer quality of life in both psychological-general symptom cluster and physical-gastrointestinal symptom cluster subgroups, with subgroup-specific patterns. The symptom clusters differed depending on stage and functional status of breast cancer survivors. Breast cancer survivors may have a specific pattern of symptom clusters. Some symptom clusters may have a negative impact on the quality of life. Identifying symptom clusters of breast cancer survivors may have clinical implications by improving symptom management.
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Affiliation(s)
- Ju-Hee Nho
- College of Nursing, Chonbuk National University, Jeonju, Korea
| | | | - Min-Ho Park
- Department of Surgery, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Sun-Seog Kweon
- Department of Preventive Medicine, Chonnam National University Medical School, Gwangju, Korea.,Jeonnam Regional Cancer Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
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Park MH, Shin KA, Kim CH, Lee YH, Park Y, Ahn J, Kim YJ. Effects of Long-Distance Running on Cardiac Markers and Biomarkers in Exercise-Induced Hypertension Runners: An Observational Study. Ann Rehabil Med 2018; 42:575-583. [PMID: 30180527 PMCID: PMC6129715 DOI: 10.5535/arm.2018.42.4.575] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 10/16/2017] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVE To investigate changes of cardiac and muscle damage markers in exercise-induced hypertension (EIH) runners before running (pre-race), immediately after completing a 100-km ultramarathon race, and during the recovery period (24, 72, and 120 hours post-race). METHODS In this observational study, volunteers were divided into EIH group (n=11) whose maximum systolic blood pressure was ≥210 mmHg in graded exercise testing and normal exercise blood pressure response (NEBPR) group (n=11). Their blood samples were collected at pre-race, immediately after race, and at 24, 72, and 120 hours post-race. RESULTS Creatine kinase (CK) and cardiac troponin I (cTnI) levels were significantly higher in EIH group than those in the NEBPR group immediately after race and at 24 hours post-race (all p<0.05). However, lactate dehydrogenase (LDH), creatine kinase-myocardial band (CKMB), or CKMB/CK levels did not show any significant differences between the two groups in each period. N-terminal pro-brain natriuretic peptide (NT-proBNP) levels were significantly higher in EIH group than those in NEBPR group immediately after race and at 24 and 72 hours postrace (all p<0.05). A high sensitivity C-reactive protein (hs-CRP) level was significantly higher in EIH group than that in NEBPR group at 24 hours post-race (p<0.05). CONCLUSION The phenomenon of higher inflammatory and cardiac marker levels in EIH group may exaggerate cardiac volume pressure and blood flow restrictions which in turn can result in cardiac muscle damage. Further prospective studies are needed to investigate the chronic effect of such phenomenon on the cardiovascular system in EIH runners.
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Affiliation(s)
- Min-Ho Park
- Department of Rehabilitation Medicine, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Kyung-A Shin
- Department of Clinical Laboratory Science, Shinsung University, Dangjin, Korea
| | - Chul-Hyun Kim
- Department of Sports Medicine, Soonchunhyang University, Asan, Korea
| | - Yoon-Hee Lee
- Department of Exercise Physiology, Korea National Sport University, Seoul, Korea
| | - Yongbum Park
- Department of Rehabilitation Medicine, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Jaeki Ahn
- Department of Rehabilitation Medicine, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Young-Joo Kim
- Department of Exercise Rehabilitation Welfare, Sungshin University - Soojung Campus, Seoul, Korea
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Park MH, Bin SI, Kim JM, Lee BS, Lee CR, Kwon YH. Using a Tibial Short Extension Stem Reduces Tibial Component Loosening After Primary Total Knee Arthroplasty in Severely Varus Knees: Long-term Survival Analysis With Propensity Score Matching. J Arthroplasty 2018; 33:2512-2517. [PMID: 29703678 DOI: 10.1016/j.arth.2018.03.058] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 03/11/2018] [Accepted: 03/22/2018] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Patients with severe preoperative varus deformity have been reported to have high rates of loosening after total knee arthroplasty (TKA), primarily on the tibial side. This study investigated whether a short extension stem for the tibial component in severely varus knees would reduce the failure rate due to loosening on the tibial side. METHODS Patients who underwent TKA, performed by a single surgeon using a single implant between November 1998 and January 2009, were retrospectively evaluated. Patients diagnosed with primary osteoarthritis, having a hip-knee-ankle axis greater than varus 8° on preoperative long-film radiographs, and postoperatively followed up for more than 2 years were included. Patients were divided into "stem" and "nonstem" groups, followed by 1:1 propensity score matching according to age, gender, body mass index, preoperative mechanical axis, and postoperative alignment. Tibial loosening rates in the 2 groups were compared. RESULTS The study cohort included 602 patients, divided into "stem" and "nonstem" groups. Propensity score matching yielded 88 pairs of patients. Mean follow-up duration was similar in the stem and nonstem groups (109.22 vs 103.81 months, P = .451). None of the patients in the stem group, compared with 5 in the nonstem group, experienced aseptic loosening. The overall implant survival rate was significantly higher in the stem group than in the nonstem group (P = .0201). CONCLUSION Using a short extension stem for the tibial component in primary TKA in patients with severe varus deformity greater than 8° may reduce the rate of loosening of the tibial side and increase the longevity of the implant. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Min-Ho Park
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Seong-Il Bin
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jong-Min Kim
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Bum-Sik Lee
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Chang-Rack Lee
- Department of Orthopedic Surgery, Inje University, Busan Paik Hospital, Busan, Republic of Korea
| | - Young-Hee Kwon
- Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
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Park MH, Byeon JJ, Shin SH, Kim N, Park Y, Ill Lee B, Choi J, Shin YG. Rapid and simultaneous quantification of a mixture of biopharmaceuticals by a liquid chromatography/quadrupole time-of-flight mass spectrometric method in rat plasma following cassette-dosing. Rapid Commun Mass Spectrom 2018; 32:889-896. [PMID: 29578307 DOI: 10.1002/rcm.8123] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 03/12/2018] [Accepted: 03/16/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE The cassette-dosing technique is a technique that administers various drugs to a single animal at once and quantitated simultaneously. The purpose of this study was to evaluate the feasibility of cassette-dosing as a means of increasing throughput and decreasing animal usage for pharmacokinetic studies of biopharmaceuticals using liquid chromatography/time-of-flight mass spectrometric (LC/TOF-MS) analysis. METHODS Brentuximab, trastuzumab, cetuximab and adalimumab were used as model biopharmaceuticals. The method consisted of immunoprecipitation followed by tryptic digestion for sample preparation and LC/TOF-MS analysis of specific signature peptides in the positive ion mode using electrospray ionization. The specific signature peptides used for quantification were from the complementarity-determining regions of each mAb. All rats received a single intravenous bolus injection containing either a single mAb or a mixture of four mAbs. RESULTS The proposed method has been qualified in linearity range of 1-100 μg/mL with correlation coefficients higher than 0.990. The qualification run met the acceptance criteria of ±25% accuracy and precision values for quality control (QC) samples. This qualified LC/TOF-MS method was successfully applied to a pharmacokinetic study in the rat. The PK properties of mAbs administered as a cassette-dosage were similar to the pharmacokinetics of each antibody drug when administered as a single entity. CONCLUSIONS These findings suggest that the cassette-dosing approach could be used to evaluate the PK properties of biopharmaceuticals in the early drug discovery stage. Also, this method would be useful for other preclinical sample analysis without developing new reagents for sample preparation.
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Affiliation(s)
- Min-Ho Park
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Jin-Ju Byeon
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Nahye Kim
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Yuri Park
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Byeong Ill Lee
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Jangmi Choi
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
| | - Young G Shin
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, South Korea
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Lee GH, Oh MS, Park MH, Shin YG, Song JH, Yu BY. Study of Ultra-Sensitive AMS Method to Identify Drug-Drug Interactions between Ciprofloxacin and Microdose 14
C-Caffeine. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11468] [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: 11/07/2022]
Affiliation(s)
- Gwan-Ho Lee
- Advanced Analysis Center; Korea Institute of Science and Technology; Seoul 02792 Republic of Korea
| | - Min-Seok Oh
- Department of Stem Cell Biology; Konkuk University, School of Medicine; Seoul 05029 Republic of Korea
| | - Min-Ho Park
- College of Pharmacy; Chungnam National University; Daejeon 34134 Republic of Korea
| | - Young G. Shin
- College of Pharmacy; Chungnam National University; Daejeon 34134 Republic of Korea
| | - Jong Han Song
- Advanced Analysis Center; Korea Institute of Science and Technology; Seoul 02792 Republic of Korea
| | - Byung-Yong Yu
- Advanced Analysis Center; Korea Institute of Science and Technology; Seoul 02792 Republic of Korea
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Park Y, Kim N, Choi J, Park MH, Lee BI, Shin SH, Byeon JJ, Shin YG. Qualification and Application of a Liquid Chromatography-Quadrupole Time-of-Flight Mass Spectrometric Method for the Determination of Adalimumab in Rat Plasma. Pharmaceutics 2018; 10:pharmaceutics10020061. [PMID: 29882925 PMCID: PMC6026932 DOI: 10.3390/pharmaceutics10020061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/20/2018] [Accepted: 05/21/2018] [Indexed: 01/08/2023] Open
Abstract
A liquid chromatography–quadrupole time-of-flight (Q-TOF) mass spectrometric method was developed for early-stage research on adalimumab in rats. The method consisted of immunoprecipitation followed by tryptic digestion for sample preparation and LC-QTOF-MS/MS analysis of specific signature peptides of adalimumab in the positive ion mode using electrospray ionization. This specific signature peptide is derived from the complementarity-determining region (CDR) of adalimumab. A quadratic regression (weighted 1/concentration), with an equation y = ax2 + bx + c, was used to fit calibration curves over the concentration range of 1–100 μg/mL for adalimumab. The qualification run met the acceptance criteria of ±25% accuracy and precision values for quality control (QC) samples. This qualified LC-QTOF-MS/MS method was successfully applied to a pharmacokinetic study of adalimumab in rats as a case study. This LC-QTOF-MS/MS approach would be useful as a complementary method for adalimumab or its biosimilars at an early stage of research.
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Affiliation(s)
- Yuri Park
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Nahye Kim
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Jangmi Choi
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Min-Ho Park
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Byeong Ill Lee
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Seok-Ho Shin
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Jin-Ju Byeon
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
| | - Young G Shin
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Daejeon 34134, Korea.
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Byeon JJ, Park MH, Shin SH, Lee BI, Park Y, Choi J, Kim N, Kang Y, Shin YG. A single liquid chromatography-quadrupole time-of-flight mass spectrometric method for the quantification of total antibody, antibody-conjugated drug and free payload of antibody-drug conjugates. Biomed Chromatogr 2018; 32:e4229. [PMID: 29505175 DOI: 10.1002/bmc.4229] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 12/20/2017] [Revised: 02/22/2018] [Accepted: 02/26/2018] [Indexed: 11/07/2022]
Abstract
A single hybrid affinity-captured-LC-TOF-MS/MS method was developed and applied for the quantification of total antibody, antibody conjugated drug and free payload of antibody drug conjugate (ADC). Adcetris®, a valine-citrulline monomethyl auristatin E conjugated ADC, was used as a model ADC compound. A quadratic regression (weighted 1/concentration) was used to fit calibration curves over the concentration range 30.65-613.00 ng/mL with an equation y = ax2 + bx + c for the antibody-conjugated drug of Adcetris®. The qualification run met the acceptance criteria of ±25% accuracy and precision values for quality control samples. For the analysis of total antibody, a signature peptide (TTPPVLDSDGSFFLYSK, molecular weight 1874) was used after affinity capture using magnetic beads and on-bead trypsin digestion. A quadratic regression (weighted 1/concentration) was used to fit calibration curves over the concentration range 5.00-100.00 μg/mL with an equation y = ax2 + bx + c for total antibody. For free payload analysis of monomethyl auristatin E, a protein precipitation method followed by LC-TOF-MS/MS analysis was used. A quadratic regression (weighted 1/concentration) was used to fit calibration curves over the concentration range 1.01-2200 ng/mL with an equation y = ax2 + bx + c for free payload. Pharmacokinetic study samples and in vitro stability samples in rat were successfully analyzed by this a hybrid affinity-captured-LC-TOF-MS/MS method. This single platform method is a useful complementary method for the pharmacokinetics study of ADC with valine-citrulline linker at the early drug discovery stage.
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Affiliation(s)
- Jin-Ju Byeon
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Min-Ho Park
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Byeong Ill Lee
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Yuri Park
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Jangmi Choi
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Nahye Kim
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Yeonjae Kang
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
| | - Young G Shin
- College of Pharmacy, Chungman National University, Daejeon, Republic of Korea
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Han JH, Tuan NQ, Park MH, Quan KT, Oh J, Heo KS, Na M, Myung CS. Cucurbitane Triterpenoids from the Fruits of Momordica Charantia
Improve Insulin Sensitivity and Glucose Homeostasis in Streptozotocin-Induced Diabetic Mice. Mol Nutr Food Res 2018; 62:e1700769. [DOI: 10.1002/mnfr.201700769] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 12/31/2017] [Indexed: 12/16/2022]
Affiliation(s)
- Joo-Hui Han
- Department of Pharmacology; Chungnam National University College of Pharmacy; Daejeon Republic of Korea
| | - Nguyen Quoc Tuan
- Department of Pharmacognosy; Chungnam National University College of Pharmacy; Daejeon Republic of Korea
| | - Min-Ho Park
- Chungnam National University College of Pharmacy; Daejeon Republic of Korea
| | - Khong Trong Quan
- Department of Pharmacognosy; Chungnam National University College of Pharmacy; Daejeon Republic of Korea
| | - Joonseok Oh
- Department of Chemistry; Yale University; New Haven CT USA
| | - Kyung-Sun Heo
- Department of Pharmacology; Chungnam National University College of Pharmacy; Daejeon Republic of Korea
| | - MinKyun Na
- Department of Pharmacognosy; Chungnam National University College of Pharmacy; Daejeon Republic of Korea
| | - Chang-Seon Myung
- Department of Pharmacology; Chungnam National University College of Pharmacy; Daejeon Republic of Korea
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Kim JH, Park MH, Jang SJ, Son SJ, Lee JY, Son JS, Kim SE, Kang SS, Choi SH. Effect of Hydrogen Dioxide Treatment on the Osteogenic Potential of Duck-beak Bone-derived Natural Bioceramic Microparticles. ACTA ACUST UNITED AC 2018; 31:373-379. [PMID: 28438865 DOI: 10.21873/invivo.11069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/13/2017] [Accepted: 03/14/2017] [Indexed: 02/05/2023]
Abstract
BACKGROUND/AIM As an alternative material to the autogenous bone, duck-beak bone particle for bone substitute have been attracting great attention due to their biological properties. To deliver the most favorable outcome of medical treatment, it is essential to study the effect of various processing methods of the duck-beak bone. In this study, we compared the two deproteinizing agents for manufacturing duck-beak bone. Group 1 was treated by a conventional chemical agent (ethylenediamine) and Group 2 by hydrogen dioxide (H2O2). In vitro and in vivo experiments were conducted in parallel to compare the cytocompatibility and osteogenic capability between two processing methods. For in vitro tests, human adipose-derived mesenchymal stem cells (hAD-MSCs) were planted onto each sample and their attachment and growing were evaluated. For in vivo biocompatibility and osteogenic properties, the samples were applied on the critical-sized calvarial bone defect of rats. Group 2 showed significantly higher cell attachment but Group1 showed slightly higher cell proliferation. In in vivo tests, all groups have shown biocompatibility and increased level of osteogenic potential. However, Group 2 had significantly higher bone regeneration (p<0.05). This experiment confirmed that H2O2 can be an optimal processing method for duck-beak bone particle.
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Affiliation(s)
- Joong-Hyun Kim
- Department of Periodontology, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea
| | - Min-Ho Park
- Department of Veterinary Surgery, Veterinary Medical Center and College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Seok Jin Jang
- Department of Veterinary Surgery, Veterinary Medical Center and College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Soo Jin Son
- Department of Veterinary Surgery, Veterinary Medical Center and College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Jae Yeon Lee
- Department of Veterinary Surgery, Veterinary Medical Center and College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
| | - Jun Sik Son
- High-Tech Fiber R&D Headquarters, Korea Textile Development Institute, Daegu, Republic of Korea
| | - Se Eun Kim
- College of Veterinary Medicine, Chonnam National University, Gwangju, Republic of Korea
| | - Seong Soo Kang
- College of Veterinary Medicine, Chonnam National University, Gwangju, Republic of Korea
| | - Seok Hwa Choi
- Department of Veterinary Surgery, Veterinary Medical Center and College of Veterinary Medicine, Chungbuk National University, Cheongju, Republic of Korea
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Kim SY, Kim SW, Shin IS, Park MH, Yoon JH, Yoon JS, Kim JM. Changes in depression status during the year after breast cancer surgery and impact on quality of life and functioning. Gen Hosp Psychiatry 2018; 50:33-37. [PMID: 28987920 DOI: 10.1016/j.genhosppsych.2017.09.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 09/22/2017] [Accepted: 09/24/2017] [Indexed: 01/30/2023]
Abstract
OBJECTIVE Although breast cancer patients' depression changes over time, most longitudinal studies have assessed the influence of only baseline depression on quality of life (QoL). Therefore, this study investigated the influence of changes in depression status on QoL in the year after surgery. METHODS Participants were interviewed at 2-5days and at 1year after surgery. Depression was diagnosed at both time points, and participants were classified into four groups: no, recovered, incident, and persistent depression. QoL-related functioning and symptoms were evaluated with the EORTC QLQ-C30 questionnaire and the interaction of depression and QoL was analyzed using a repeated-measures analysis of covariance (RMANCOVA). RESULTS Of the 306 participants, 247 were evaluated at 1year after surgery; 165 had no depression, 40 had recovered from depression, 24 had incident depression, and 18 had persistent depression. The RMANCOVA revealed significant time-by-group interactions; the no-depression group exhibited better recovery in general QoL and functioning, whereas the persistent-depression group showed the worst recovery. QoL and functioning improved in the recovered depression group, but worsened in the group with incident depression. CONCLUSIONS The different impacts of changes in depression status on QoL highlight the importance of periodic screening for depression.
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Affiliation(s)
- Seon-Young Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea; Mental Health Clinic, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea
| | - Sung-Wan Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Il-Seon Shin
- Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Min-Ho Park
- Breast and Endocrine Tumor Clinic, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea
| | - Jung-Han Yoon
- Breast and Endocrine Tumor Clinic, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea
| | - Jin-Sang Yoon
- Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Jae-Min Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea.
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Lee BI, Park MH, Heo SC, Park Y, Shin SH, Byeon JJ, Kim JH, Shin YG. Quantification and application of a liquid chromatography-tandem mass spectrometric method for the determination of WKYMVm peptide in rat using solid-phase extraction. Biomed Chromatogr 2017; 32. [PMID: 28976575 DOI: 10.1002/bmc.4107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 03/16/2017] [Revised: 07/26/2017] [Accepted: 09/26/2017] [Indexed: 12/30/2022]
Abstract
A liquid chromatographic-electrospray ionization-time-of-flight/mass spectrometric (LC-ESI-TOF/MS) method was developed and applied for the determination of WKYMVm peptide in rat plasma to support preclinical pharmacokinetics studies. The method consisted of micro-elution solid-phase extraction (SPE) for sample preparation and LC-ESI-TOF/MS in the positive ion mode for analysis. Phenanthroline (10 mg/mL) was added to rat blood immediately for plasma preparation followed by addition of trace amount of 2 m hydrogen chloride to plasma before SPE for stability of WKYMVm peptide. Then sample preparation using micro-elution SPE was performed with verapamil as an internal standard. A quadratic regression (weighted 1/concentration2 ), with the equation y = ax2 + bx + c was used to fit calibration curves over the concentration range of 3.02-2200 ng/mL for WKYMVm peptide. The quantification run met the acceptance criteria of ±25% accuracy and precision values. For quality control samples at 15, 165 and 1820 ng/mL from the quantification experiment, the within-run and the between-run accuracy ranged from 92.5 to 123.4% with precision values ≤15.1% for WKYMVm peptide from the nominal values. This novel LC-ESI-TOF/MS method was successfully applied to evaluate the pharmacokinetics of WKYMVm peptide in rat plasma.
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Affiliation(s)
- Byeong Ill Lee
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Min-Ho Park
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Soon Chul Heo
- College of Medicine, Pusan National University, Republic of Korea
| | - Yuri Park
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Jin-Ju Byeon
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Jae Ho Kim
- College of Medicine, Pusan National University, Republic of Korea
| | - Young G Shin
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
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Je SG, Yoo SC, Kim JS, Park YK, Park MH, Moon J, Min BC, Choe SB. Emergence of Huge Negative Spin-Transfer Torque in Atomically Thin Co layers. Phys Rev Lett 2017; 118:167205. [PMID: 28474913 DOI: 10.1103/physrevlett.118.167205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Indexed: 06/07/2023]
Abstract
Current-induced domain wall motion has drawn great attention in recent decades as the key operational principle of emerging magnetic memory devices. As the major driving force of the motion, the spin-orbit torque on chiral domain walls has been proposed and is currently extensively studied. However, we demonstrate here that there exists another driving force, which is larger than the spin-orbit torque in atomically thin Co films. Moreover, the direction of the present force is found to be the opposite of the prediction of the standard spin-transfer torque, resulting in the domain wall motion along the current direction. The symmetry of the force and its peculiar dependence on the domain wall structure suggest that the present force is, most likely, attributed to considerable enhancement of a negative nonadiabatic spin-transfer torque in ultranarrow domain walls. Careful measurements of the giant magnetoresistance manifest a negative spin polarization in the atomically thin Co films which might be responsible for the negative spin-transfer torque.
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Affiliation(s)
- Soong-Geun Je
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sang-Cheol Yoo
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
- Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Joo-Sung Kim
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
| | - Yong-Keun Park
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
- Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Min-Ho Park
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
| | - Joon Moon
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
| | - Byoung-Chul Min
- Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Sug-Bong Choe
- Department of Physics and Institute of Applied Physics, Seoul National University, Seoul 151-742, Republic of Korea
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Park MH, Kim S, Hwang H, Park H, Kwak J, Kwon EK, Sung HY, Han B. Positive Rates of Preliminary Crossmatches Among Transplantation Candidates Waitlisted for Different Organs in the Korean Network for Organ Sharing. Transplant Proc 2017; 48:2464-2466. [PMID: 27742323 DOI: 10.1016/j.transproceed.2016.02.086] [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] [Received: 12/21/2015] [Accepted: 02/02/2016] [Indexed: 10/20/2022]
Abstract
OBJECTIVE For deceased-donor organ transplantations, negative T cell crossmatches (XMs) are mandatory for kidney and pancreas allocation in the Korean Network for Organ Sharing (KONOS) organ allocation system. Submission and periodic renewal of serum to the KONOS is required for all transplantation candidates of kidney or pancreas and these sera are distributed to 23 laboratories for preliminary XMs. We have investigated how sensitization status varies among transplantation candidates waitlisted for different organs. METHODS Positive rates of T cell XMs performed during recent 1-year period (from March 2014 to February 2015) in the Korea Organ Donation Agency laboratory have been analyzed according to different organs. For 163 cases of deceased donors, 3605 recipients (22.1 recipients per one donor) were crossmatched using both of National Institutes of Health and antihuman globulin complement-dependent cytotoxicity (CDC) methods and flow cytometry method. RESULTS T cell XM positive rates varied among transplantation candidates for different organs. The positive rate was high for kidney (485/3,145, 15.4%), and low for pancreas or kidney/pancreas (7/200, 3.5%), lung (0/41, 0%), and heart (11/221, 5.0%). Among XM-positive individuals, nearly two-thirds of the kidney transplantation candidates showed strong sensitization status with CDC+/flow+ results (64.5%), whereas pancreas or kidney/pancreas transplantation candidates more commonly showed weaker sensitization status with CDC-/flow+ results (85.7%). CONCLUSION Kidney transplantation candidates show a much higher positive rate and stronger sensitization status than candidates for other organs. The results of this study would be useful for determining the number of candidates to be crossmatched for different organs.
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Affiliation(s)
- M H Park
- Korea Organ Donation Agency Laboratory, Seoul, Korea.
| | - S Kim
- Korea Organ Donation Agency Laboratory, Seoul, Korea
| | - H Hwang
- Korea Organ Donation Agency Laboratory, Seoul, Korea
| | - H Park
- Korea Organ Donation Agency Laboratory, Seoul, Korea
| | - J Kwak
- Korea Organ Donation Agency Laboratory, Seoul, Korea
| | - E K Kwon
- Korea Organ Donation Agency Laboratory, Seoul, Korea
| | - H Y Sung
- Korea Organ Donation Agency Laboratory, Seoul, Korea
| | - B Han
- Korea Organ Donation Agency Laboratory, Seoul, Korea
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Park GJ, Bae SH, Park WS, Han S, Park MH, Shin SH, Shin YG, Yim DS. Drug-drug interaction of microdose and regular-dose omeprazole with a CYP2C19 inhibitor and inducer. Drug Des Devel Ther 2017; 11:1043-1053. [PMID: 28408803 PMCID: PMC5384691 DOI: 10.2147/dddt.s131797] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
PURPOSE A microdose drug-drug interaction (DDI) study may be a valuable tool for anticipating drug interaction at therapeutic doses. This study aimed to compare the magnitude of DDIs at microdoses and regular doses to explore the applicability of a microdose DDI study. PATIENTS AND METHODS Six healthy male volunteer subjects were enrolled into each DDI study of omeprazole (victim) and known perpetrators: fluconazole (inhibitor) and rifampin (inducer). For both studies, the microdose (100 μg, cold compound) and the regular dose (20 mg) of omeprazole were given at days 0 and 1, respectively. On days 2-9, the inhibitor or inducer was given daily, and the microdose and regular dose of omeprazole were repeated at days 8 and 9, respectively. Full omeprazole pharmacokinetic samplings were performed at days 0, 1, 8, and 9 of both studies for noncompartmental analysis. RESULTS The magnitude of the DDI, the geometric mean ratios (with perpetrator/omeprazole only) of maximum concentration (Cmax) and area under the curve to the last measurement (AUCt) of the microdose and the regular dose were compared. The geometric mean ratios in the inhibition study were: 2.17 (micro) and 2.68 (regular) for Cmax, and 4.07 (micro), 4.33 (regular) for AUCt. For the induction study, they were 0.26 (micro) and 0.21 (regular) for Cmax, and 0.16 (micro) and 0.15 (regular) for AUCt. There were no significant statistical differences in the magnitudes of DDIs between microdose and regular-dose conditions, regardless of induction or inhibition. CONCLUSION Our results may be used as partial evidence that microdose DDI studies may replace regular-dose studies, or at least be used for DDI-screening purposes.
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Affiliation(s)
- Gab-Jin Park
- Department of Clinical Pharmacology and Therapeutics, Seoul St Mary's Hospital, PIPET (Pharmacometrics Institute for Practical Education and Training), College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Soo Hyeon Bae
- Department of Clinical Pharmacology and Therapeutics, Seoul St Mary's Hospital, PIPET (Pharmacometrics Institute for Practical Education and Training), College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Wan-Su Park
- Department of Clinical Pharmacology and Therapeutics, Seoul St Mary's Hospital, PIPET (Pharmacometrics Institute for Practical Education and Training), College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Seunghoon Han
- Department of Clinical Pharmacology and Therapeutics, Seoul St Mary's Hospital, PIPET (Pharmacometrics Institute for Practical Education and Training), College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Min-Ho Park
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Young G Shin
- College of Pharmacy, Chungnam National University, Daejeon, South Korea
| | - Dong-Seok Yim
- Department of Clinical Pharmacology and Therapeutics, Seoul St Mary's Hospital, PIPET (Pharmacometrics Institute for Practical Education and Training), College of Medicine, Catholic University of Korea, Seoul, South Korea.,College of Pharmacy, Chungnam National University, Daejeon, South Korea
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Seo HK, Kim H, Lee J, Park MH, Jeong SH, Kim YH, Kwon SJ, Han TH, Yoo S, Lee TW. Efficient Flexible Organic/Inorganic Hybrid Perovskite Light-Emitting Diodes Based on Graphene Anode. Adv Mater 2017; 29:1605587. [PMID: 28117521 DOI: 10.1002/adma.201605587] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 12/06/2016] [Indexed: 06/06/2023]
Abstract
Highly efficient organic/inorganic hybrid perovskite light-emitting diodes (PeLEDs) based on graphene anode are developed for the first time. Chemically inert graphene avoids quenching of excitons by diffused metal atom species from indium tin oxide. The flexible PeLEDs with graphene anode on plastic substrate show good bending stability; they provide an alternative and reliable flexible electrode for highly efficient flexible PeLEDs.
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Affiliation(s)
- Hong-Kyu Seo
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Hobeom Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Jaeho Lee
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
| | - Min-Ho Park
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Su-Hun Jeong
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Young-Hoon Kim
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Sung-Joo Kwon
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Tae-Hee Han
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seunghyup Yoo
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
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Lee JS, Kim GE, Park MH, Yoon JH. Abstract P4-12-11: Up-regulation of SPARC is associated with breast tumor progression and epithelial SPARC expression is correlated with poor survival and MMP-2 expression in patients with breast carcinoma. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p4-12-11] [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: 11/16/2022]
Abstract
Abstract
Background: Secreted protein acidic and rich in cysteine (SPARC) plays a crucial role in the process of tumor invasion and metastasis in many cancers. Matrix metalloproteinases (MMPs) degrade the extracellular matrix and participate in several key processes of invasion and metastasis. The aims of this study were to evaluate the potential involvement of SPARC in the progression of breast tumor and to determine its association with outcome variables and MMPs expression in patients with breast carcinoma (BC).
Materials and Methods: SPARC expression was examined in 8 pairs of BC tissues and surrounding normal tissues at mRNA and protein levels by quantitative real-time PCR (qRT-PCR), RNAscope in situ hybridization (ISH), Western blotting, and immunohistochemistry techniques. Immunohistochemical staining of SPARC on tissue microarray was done in 26 normal breasts, 76 ductal carcinoma in situ (DCIS), and 198 BC samples. In addition, we performed immunohistochemical staining for MMP-2 and MMP-9 in BC.
Results: SPARC expression at mRNA and protein levels by qRT-PCR and Western blotting was significantly increased in BC tissues compared to the surrounding normal tissues (p < 0.05 and p < 0.01, respectively). RNAscope ISH and immunohistochemistry of SPARC confirmed that SPARC expression was increased in BC tissues compared with their normal tissues and its expression was more pronounced in the stromal compartment than in epithelial compartment. SPARC expression was different among the normal, DCIS and BC groups and epithelial SPARC expression increased progressively from normal breast through DCIS to BC (p < 0.001). In patients with BC, high epithelial SPARC expression was associated with worse disease-free and overall survival (p = 0.002 and p = 0.048, respectively) and independently predicted worse disease-free survival (p = 0.002). Epithelial SPARC expression was significantly correlated with MMP-2 expression (p < 0.05).
Conclusion: Our results suggest that up-regulation of SPARC contributes to breast tumor progression. SPARC expression may be a useful biomarker for the prognostic prediction in patients with BC. SPARC can control extracellular matrix degradation through up-regulation of MMP-2.
Citation Format: Lee JS, Kim G-E, Park MH, Yoon JH. Up-regulation of SPARC is associated with breast tumor progression and epithelial SPARC expression is correlated with poor survival and MMP-2 expression in patients with breast carcinoma [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P4-12-11.
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Affiliation(s)
- JS Lee
- Chonnam National University Medical School, Gwangju, Republic of Korea
| | - G-E Kim
- Chonnam National University Medical School, Gwangju, Republic of Korea
| | - MH Park
- Chonnam National University Medical School, Gwangju, Republic of Korea
| | - JH Yoon
- Chonnam National University Medical School, Gwangju, Republic of Korea
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Park MH, Shin SH, Byeon JJ, Lee GH, Yu BY, Shin YG. Prediction of pharmacokinetics and drug-drug interaction potential using physiologically based pharmacokinetic (PBPK) modeling approach: A case study of caffeine and ciprofloxacin. Korean J Physiol Pharmacol 2016; 21:107-115. [PMID: 28066147 PMCID: PMC5214901 DOI: 10.4196/kjpp.2017.21.1.107] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 10/05/2016] [Revised: 11/07/2016] [Accepted: 11/14/2016] [Indexed: 11/15/2022]
Abstract
Over the last decade, physiologically based pharmacokinetics (PBPK) application has been extended significantly not only to predicting preclinical/human PK but also to evaluating the drug-drug interaction (DDI) liability at the drug discovery or development stage. Herein, we describe a case study to illustrate the use of PBPK approach in predicting human PK as well as DDI using in silico, in vivo and in vitro derived parameters. This case was composed of five steps such as: simulation, verification, understanding of parameter sensitivity, optimization of the parameter and final evaluation. Caffeine and ciprofloxacin were used as tool compounds to demonstrate the “fit for purpose” application of PBPK modeling and simulation for this study. Compared to caffeine, the PBPK modeling for ciprofloxacin was challenging due to several factors including solubility, permeability, clearance and tissue distribution etc. Therefore, intensive parameter sensitivity analysis (PSA) was conducted to optimize the PBPK model for ciprofloxacin. Overall, the increase in Cmax of caffeine by ciprofloxacin was not significant. However, the increase in AUC was observed and was proportional to the administered dose of ciprofloxacin. The predicted DDI and PK results were comparable to observed clinical data published in the literatures. This approach would be helpful in identifying potential key factors that could lead to significant impact on PBPK modeling and simulation for challenging compounds.
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Affiliation(s)
- Min-Ho Park
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Seok-Ho Shin
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Jin-Ju Byeon
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
| | - Gwan-Ho Lee
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02453, Korea
| | - Byung-Yong Yu
- Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Korea
| | - Young G Shin
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
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Park MH, Jun HS, Jeon JW, Park JK, Lee BJ, Suh GH, Park JS, Cho CW. Preparation and characterization of bee venom-loaded PLGA particles for sustained release. Pharm Dev Technol 2016; 23:857-864. [PMID: 27881046 DOI: 10.1080/10837450.2016.1264415] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bee venom-loaded poly(lactic-co-glycolic acid) (PLGA) particles were prepared by double emulsion-solvent evaporation, and characterized for a sustained-release system. Factors such as the type of organic solvent, the amount of bee venom and PLGA, the type of PLGA, the type of polyvinyl alcohol, and the emulsification method were considered. Physicochemical properties, including the encapsulation efficiency, drug loading, particle size, zeta-potential and surface morphology were examined by Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The size of the bee venom-loaded PLGA particles was 500 nm (measured using sonication). Zeta-potentials of the bee venom-loaded PLGA particles were negative owing to the PLGA. FT-IR results demonstrated that the bee venom was completely encapsulated in the PLGA particles, indicated by the disappearance of the amine and amide peaks. In addition, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis indicated that the bee venom in the bee venom-loaded PLGA particles was intact. In vitro release of the bee venom from the bee venom-loaded PLGA particles showed a sustained-release profile over 1 month. Bee venom-loaded PLGA particles can help improve patients' quality of life by reducing the number of injections required.
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Affiliation(s)
- Min-Ho Park
- a College of Pharmacy and Institute of Drug Research and Development , Chungnam National University , Daejeon , South Korea
| | - Hye-Suk Jun
- a College of Pharmacy and Institute of Drug Research and Development , Chungnam National University , Daejeon , South Korea
| | | | | | - Bong-Joo Lee
- c College of Veterinary Medicine , Chonnam National University , Gwangju , South Korea
| | - Guk-Hyun Suh
- c College of Veterinary Medicine , Chonnam National University , Gwangju , South Korea
| | - Jeong-Sook Park
- a College of Pharmacy and Institute of Drug Research and Development , Chungnam National University , Daejeon , South Korea
| | - Cheong-Weon Cho
- a College of Pharmacy and Institute of Drug Research and Development , Chungnam National University , Daejeon , South Korea
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