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Lee J, Lee S, Lim JW, Byun I, Jang KJ, Kim JW, Chung JH, Kim J, Seonwoo H. Development of Plum Seed-Derived Carboxymethylcellulose Bioink for 3D Bioprinting. Polymers (Basel) 2023; 15:4473. [PMID: 38231895 PMCID: PMC10708124 DOI: 10.3390/polym15234473] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/16/2023] [Accepted: 11/16/2023] [Indexed: 01/19/2024] Open
Abstract
Three-dimensional bioprinting represents an innovative platform for fabricating intricate, three-dimensional (3D) tissue structures that closely resemble natural tissues. The development of hybrid bioinks is an actionable strategy for integrating desirable characteristics of components. In this study, cellulose recovered from plum seed was processed to synthesize carboxymethyl cellulose (CMC) for 3D bioprinting. The plum seeds were initially subjected to α-cellulose recovery, followed by the synthesis and characterization of plum seed-derived carboxymethyl cellulose (PCMC). Then, hybrid bioinks composed of PCMC and sodium alginate were fabricated, and their suitability for extrusion-based bioprinting was explored. The PCMC bioinks exhibit a remarkable shear-thinning property, enabling effortless extrusion through the nozzle and maintaining excellent initial shape fidelity. This bioink was then used to print muscle-mimetic 3D structures containing C2C12 cells. Subsequently, the cytotoxicity of PCMC was evaluated at different concentrations to determine the maximum acceptable concentration. As a result, cytotoxicity was not observed in hydrogels containing a suitable concentration of PCMC. Cell viability was also evaluated after printing PCMC-containing bioinks, and it was observed that the bioprinting process caused minimal damage to the cells. This suggests that PCMC/alginate hybrid bioink can be used as a very attractive material for bioprinting applications.
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Affiliation(s)
- Juo Lee
- Department of Animal Science & Technology, College of Life Science and Natural Resources, Sunchon National University, Suncheon 57922, Republic of Korea;
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Sungmin Lee
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Republic of Korea
- Department of Human Harmonized Robotics, College of Engineering, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Jae Woon Lim
- Department of Biosystems Engineering, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Iksong Byun
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Republic of Korea
- Department of Agricultural Machinery Engineering, College of Life Science and Natural Resources, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Kyoung-Je Jang
- Department of Bio-Systems Engineering, Institute of Smart Farm, Gyeongsang National University, Jinju 52828, Republic of Korea
- Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Jin-Woo Kim
- Department of Biological & Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701, USA
- Materials Science & Engineering Program, University of Arkansas, Fayetteville, AR 72701, USA
| | | | - Jungsil Kim
- Department of Bio-Industrial Machinery Engineering, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hoon Seonwoo
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Republic of Korea
- Department of Convergent Biosystems Engineering, College of Life Science and Natural Resources, Sunchon National University, Suncheon 57922, Republic of Korea
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Han J, Park S, Kim JE, Park B, Hong Y, Lim JW, Jeong S, Son H, Kim HB, Seonwoo H, Jang KJ, Chung JH. Development of a Scaffold-on-a-Chip Platform to Evaluate Cell Infiltration and Osteogenesis on the 3D-Printed Scaffold for Bone Regeneration. ACS Biomater Sci Eng 2023; 9:968-977. [PMID: 36701173 DOI: 10.1021/acsbiomaterials.2c01367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Developing a scaffold for efficient and functional bone regeneration remains challenging. To accomplish this goal, a "scaffold-on-a-chip" device was developed as a platform to aid with the evaluation process. The device mimics a microenvironment experienced by a transplanted bone scaffold. The device contains a circular space at the center for scaffold insert and microfluidic channel that encloses the space. Such a design allows for monitoring of cell behavior at the blood-scaffold interphase. MC3T3-E1 cells were cultured with three different types of scaffold inserts to test its capability as an evaluation platform. Cellular behaviors, including migration, morphology, and osteogenesis with each scaffold, were analyzed through fluorescence images of live/dead assay and immunocytochemistry. Cellular behaviors, such as migration, morphology, and osteogenesis, were evaluated. The results revealed that our platform could effectively evaluate the osteoconductivity and osteoinductivity of scaffolds with various properties. In conclusion, our proposed platform is expected to replace current in vivo animal models as a highly relevant in vitro platform and can contribute to the fundamental study of bone regeneration.
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Affiliation(s)
- Jinsub Han
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea.,Convergence Major in Global Smart Farm, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Sangbae Park
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Jae Eun Kim
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea
| | - Byeongjoo Park
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea
| | - Yeonggeol Hong
- Department of Bio-Systems Engineering, Institute of Smart Farm, Gyeongsang National University, Jinju 52828, Korea
| | - Jae Woon Lim
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Seung Jeong
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Hyunmok Son
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Hong Bae Kim
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Hoon Seonwoo
- Department of Convergent Biosystems Engineering, College of Life Sciences and Natural Resources, Sunchon National University, Suncheon 57922, Korea.,Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Korea
| | - Kyoung-Je Jang
- Department of Bio-Systems Engineering, Institute of Smart Farm, Gyeongsang National University, Jinju 52828, Korea.,Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea
| | - Jong Hoon Chung
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea.,Convergence Major in Global Smart Farm, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea.,Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
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Hazaraimi MH, Goh PS, Lau WJ, Ismail AF, Wu Z, Subramaniam MN, Lim JW, Kanakaraju D. The state-of-the-art development of photocatalysts for the degradation of persistent herbicides in wastewater. Sci Total Environ 2022; 843:156975. [PMID: 35764157 DOI: 10.1016/j.scitotenv.2022.156975] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/15/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
Herbicides are one of the most recurring pollutants in the aquatic system due to their widespread usage in the agriculture sector for weed control. Semiconductor-based photocatalysts have gained recognition due to their ability to degrade and mineralize pollutants into harmless by-products completely. Lately, many studies have been done to design photocatalysts with efficient separation of photogenerated charge carriers and enhanced light absorption. Photocatalyst engineering through doping with metal and non-metal elements and the formation of heterojunction are proven effective for minimizing the recombination of electron-hole pairs and enlarging the absorption in the visible light region. This review focuses on discussing and evaluating the recent progress in the types of photocatalysts and their performance in the remediation of herbicides in wastewater. The development of innovative hybrid technologies is also highlighted. The limitations and challenges of photocatalysis technology in the present literature have been identified, and future studies are recommended.
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Affiliation(s)
- M H Hazaraimi
- Advanced Membrane Technology Research Center, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
| | - P S Goh
- Advanced Membrane Technology Research Center, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.
| | - W J Lau
- Advanced Membrane Technology Research Center, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
| | - A F Ismail
- Advanced Membrane Technology Research Center, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
| | - Z Wu
- Aston Institute of Materials Research, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
| | - M N Subramaniam
- Aston Institute of Materials Research, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
| | - J W Lim
- HICoE-Centre for Biofuel and Biochemical Research, Institute of Self-Sustainable Building, Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, Seri Iskandar, Perak Darul Ridzuan 32610, Malaysia
| | - D Kanakaraju
- Faculty of Resource and Science Technology, Universiti Malaysia, Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
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Lim JW, Lindsay E, Rehman H, Tong EYH, Ammen bin Badekrizaman M, Withall A, Dalgleish S, Mitchell M, Boddie D. 941 The Effect of COVID-19 on Orthopaedic Trauma Theatre Efficiency and Surgical Training in the North and East of Scotland Major Trauma Centres – a Year On. Br J Surg 2022. [DOI: 10.1093/bjs/znac269.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Aim
To determine the orthopaedic trauma theatre efficiency in two large major trauma centres (MTCs) in Scotland before and after the outbreak of Coronavirus disease (COVID-19) pandemic.
Method
All trauma patients presented to the North and East of Scotland's MTCs prior to the outbreak of COVID-19 (7th May to 7th June 2019), during the first peak of COVID-19 (7th May to 7th June 2020), after Aerosol Generating Procedures updates (7th November to 7th December 2020) and the ‘new normal’ (7th May to 7th June 2021) were retrospectively reviewed. Training opportunities and theatre time were compared. The Kruskall-Wallis test was used.
Results
There were no significant differences in the length of hospital stay (p=0.117, 0.065) and time from injuries and surgery within groups in both MTCs (p=0.508, 0.384). The pandemic has negatively affected the anaesthetic and surgical preparation time, time between end of procedure and send for next case, and turnover time, with more profound effect on the North of Scotland's MTC. The trainee's involvement as main surgeon had decreased with the outbreak of the pandemic, with the junior trainees being affected most severely in North of Scotland. The time taken for patient to arrive to theatre after sending and total downtime were twice as long in the North of Scotland.
Conclusion
The COVID-19 pandemic has negatively impacted the orthopaedic trauma theatre efficiency and training opportunities. Actions should be taken to improve the turnover time to maximise theatre efficiency while prioritizing training opportunities.
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Affiliation(s)
- JW Lim
- Aberdeen Royal Infirmary , Aberdeen , United Kingdom
| | - E Lindsay
- Ninewells Hospital and Medical School , Dundee , United Kingdom
| | - H Rehman
- Warrington Hospital , Warrington , United Kingdom
| | - EYH Tong
- University of Aberdeen , Aberdeen , United Kingdom
| | | | - A Withall
- Ninewells Hospital and Medical School , Dundee , United Kingdom
| | - S Dalgleish
- Ninewells Hospital and Medical School , Dundee , United Kingdom
| | - M Mitchell
- Aberdeen Royal Infirmary , Aberdeen , United Kingdom
| | - D Boddie
- Aberdeen Royal Infirmary , Aberdeen , United Kingdom
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Lim JW, Rehman H. 947 COVID19 and Its Impact on the North and East of Scotland Orthopaedic Trainees. Br J Surg 2022. [DOI: 10.1093/bjs/znac269.092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Abstract
Aim
We conducted a trainee survey at the first peak of the pandemic to investigate the impact of COVID-19 on the North of Scotland (NoS) and East of Scotland (EoS) orthopaedic trainees.
Method
An online survey was distributed to all NoS and EoS orthopaedic trainees. All data collection was anonymous.
Results
Across both Scottish deaneries, 28 trainees had responded: 39% from EoS and 61% from NoS. Trainees at all stages of training responded to the survey, with the most responses received from specialist trainees in third year of training (ST3) (25%). In response to the pandemic, 18% of trainees had been redeployed and they were from NoS. Since the reconfiguration of service, 18% of trainees had done >20 operations in a month and they were senior trainees. If COVID-19 outbreak is likely going to reduce operating opportunities for a long period, only 36% of trainees would be open to the idea of making standard surgical specialty training longer whereas 57% of trainees would be open to longer working hours to achieve certification in Trauma and Orthopaedic surgery within 96 months.
Conclusion
The outbreak of COVID-19 has impacted both deaneries orthopaedic training and urgent restoration of surgical training is essential for individual trainees. Changes in working practices necessitated by COVID-19 have known to impact theatre efficiency. Actions should be taken to improve the theatre efficiency while prioritizing training opportunities.
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Affiliation(s)
- JW Lim
- Aberdeen Royal Infirmary , Aberdeen , United Kingdom
| | - H Rehman
- Warrington Hospital , Warrington , United Kingdom
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Jaiswal S, Dutta PK, Kumar S, Koh J, Lee MC, Lim JW, Pandey S, Garg P. Synthesis, characterization and application of chitosan-N-(4-hydroxyphenyl)-methacrylamide derivative as a drug and gene carrier. Int J Biol Macromol 2022; 195:75-85. [PMID: 34883163 DOI: 10.1016/j.ijbiomac.2021.11.204] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 11/28/2021] [Accepted: 11/29/2021] [Indexed: 01/16/2023]
Abstract
The aim of this study was to develop a green method to fabricate a novel CS modified N-(4-hydroxyphenyl)- methacrylamide conjugate (CSNHMA) and to evaluate its biomedical potential. CSNHMA has been prepared by a simple method via aza Michael addition reaction between CS and N- (4-hydroxyphenyl)-methacrylamide (NHMA) in ethanol. Its structural and morphological properties were characterized by various analysis techniques. The obtained results confirmed that a highly porous network structure of CSNHMA was successfully synthesized via aza Michael addition reaction. Consequently, it was analyzed as a drug and gene carrier. CSNHMA/pGL3 showed an enhanced buffering capacity due to the presence of NHMA moiety leading to higher transfection efficiency in all cancer cells (A549, HeLa and HepG2) as compared to native CS and Lipofectamine®. Therefore, these findings clearly support the possibility of using CSNHMA as a good transfection agent. For in vitro drug release study, we prepared CSNHMA nanoparticles (NPs) and curcumin loaded CSNHMA NPs of size <230 nm respectively via the non-toxic ionic gelation route and the encapsulation efficiency of drug was found to be 77.03%. In vitro drug release studies demonstrated a faster and sustained release of curcumin loaded CSNHMA NPs at pH 5.0 compared to physiological pH.
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Affiliation(s)
- Shefali Jaiswal
- Polymer Research Laboratory, Department of Chemistry, Motilal Nehru National Institute of Technology, Allahabad 211004, India.
| | - Pradip Kumar Dutta
- Polymer Research Laboratory, Department of Chemistry, Motilal Nehru National Institute of Technology, Allahabad 211004, India.
| | - Santosh Kumar
- Division of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea.
| | - Joonseok Koh
- Division of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea.
| | - Myung Chul Lee
- Department of Biosystems & Biomaterial Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Jae Woon Lim
- Department of Biosystems & Biomaterial Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Shambhavi Pandey
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea.
| | - Pankaj Garg
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea.
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Tan TK, Lim JW, Alkandari N, Ridley D, Sripada S, Jariwala A. 730 Is The Total Hip Arthroplasty For Hip Fracture Comparable With Matched Elective Cohort ? A Prospective Study. Br J Surg 2021. [DOI: 10.1093/bjs/znab259.1006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Aim
Total hip replacement (THR) has been effective in managing osteoarthritis but its effectiveness in managing neck of femur fracture (#NOF) is debatable due to higher risk of morbidity and mortality. We aimed to review the selection criteria for trauma THR and to compare the functional outcomes and complication profiles of trauma THR cohort with elective THR cohorts.
Method
we prospectively reviewed patients undergoing THR for #NOF with follow-up. The functional outcomes, any further complications-related admissions and death within a year were noted for subsequent analysis. All the patients and data collected were subsequently matched with the elective cohort.
Results
Forty-one matched cases were included in our study. The Modified Harris Hip Score (mHHS) was significantly lower pre-operatively in elective cohort (41.4±14.3 VS 60.3±22.2, P < 0.001) and achieved significantly higher score than trauma cohort 1-year post operatively (88.2±10.9 VS 82.6±12.7, P = 0.029). As for the mHHS Function, the trauma cohort achieved similar value with the pre-operative score post-operatively, and no significant difference was witnessed between the trauma and elective cohort post-operatively (35.1±7.4 VS 37.6±7.7, P = 0.142). mHHS Pain score was significantly higher in trauma cohort pre-operatively (19.8±15.3 VS 12.7±6.3, P = 0.034), but the score was significantly higher than trauma cohort 1-year postoperatively (42.7±4.4 VS 40.7±7.7, P = 0.027). Both cohorts had similar complication rate.
Conclusions
Our study further justified the clinical indication of THR for #NOF. With careful selection, trauma THR can achieve similar HHS function and better pain score. Further randomized controlled trials are warranted to justify our findings.
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Affiliation(s)
- T K Tan
- Sir Charles Gairdner Hospital, Perth, Australia
| | - J W Lim
- Aberdeen Royal Infirmary, Aberdeen, United Kingdom
| | | | - D Ridley
- Ninewells Hospital, Dundee, United Kingdom
| | - S Sripada
- Ninewells Hospital, Dundee, United Kingdom
| | - A Jariwala
- Ninewells Hospital, Dundee, United Kingdom
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Kim JE, Park S, Lee WS, Han J, Lim JW, Jeong S, Lee MC, Yang WY, Seonwoo H, Kim BM, Choung YH, Jang KJ, Chung JH. Enhanced Osteogenesis of Dental Pulp Stem Cells In Vitro Induced by Chitosan-PEG-Incorporated Calcium Phosphate Cement. Polymers (Basel) 2021; 13:polym13142252. [PMID: 34301012 PMCID: PMC8309336 DOI: 10.3390/polym13142252] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/05/2021] [Accepted: 07/05/2021] [Indexed: 11/17/2022] Open
Abstract
The use of bone graft materials is required for the treatment of bone defects damaged beyond the critical defect; therefore, injectable calcium phosphate cement (CPC) is actively used after surgery. The application of various polymers to improve injectability, mechanical strength, and biological function of injection-type CPC is encouraged. We previously developed a chitosan–PEG conjugate (CS/PEG) by a sulfur (VI) fluoride exchange reaction, and the resulting chitosan derivative showed high solubility at a neutral pH. We have demonstrated the CPC incorporated with a poly (ethylene glycol) (PEG)-grafted chitosan (CS/PEG) and developed CS/PEG CPC. The characterization of CS/PEG CPC was conducted using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The initial properties of CS/PEG CPCs, such as the pH, porosity, mechanical strength, zeta potential, and in vitro biocompatibility using the WST-1 assay, were also investigated. Moreover, osteocompatibility of CS/PEG CPCs was carried out via Alizarin Red S staining, immunocytochemistry, and Western blot analysis. CS/PEG CPC has enhanced mechanical strength compared to CPC, and the cohesion test also demonstrated in vivo stability. Furthermore, we determined whether CS/PEG CPC is a suitable candidate for promoting the osteogenic ability of Dental Pulp Stem Cells (DPSC). The elution of CS/PEG CPC entraps more calcium ion than CPC, as confirmed through the zeta potential test. Accordingly, the ion trapping effect of CS/PEG is considered to have played a role in promoting osteogenic differentiation of DPSCs. The results strongly suggested that CS/PEG could be used as suitable additives for improving osteogenic induction of bone substitute materials.
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Affiliation(s)
- Jae Eun Kim
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.E.K.); (J.H.)
| | - Sangbae Park
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (J.W.L.); (S.J.)
| | - Woong-Sup Lee
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Korea; (W.-S.L.); (B.M.K.)
| | - Jinsub Han
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.E.K.); (J.H.)
- BK21 Global Smart Farm Educational Research Center, Seoul National University, Seoul 08826, Korea
| | - Jae Woon Lim
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (J.W.L.); (S.J.)
| | - Seung Jeong
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (J.W.L.); (S.J.)
| | - Myung Chul Lee
- Department of Brigham and Women’s Hospital, Division of Engineering in Medicine, Harvard Medical School, Cambridge, MA 02139, USA;
| | - Woo-Young Yang
- Dental Research Institute, Seoul National University, Seoul 08826, Korea;
| | - Hoon Seonwoo
- Department of Industrial Machinery Engineering, College of Life Sciences and Natural Resources, Sunchon National University, Suncheon 57922, Korea;
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Korea
| | - B. Moon Kim
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Korea; (W.-S.L.); (B.M.K.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea;
| | - Kyoung-Je Jang
- Division of Agro-System Engineering, College of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea
- Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea
- Correspondence: (K.-J.J.); (J.H.C.); Tel.: +82-55-772-1898 (K.-J.J.); +82-2-880-4601 (J.H.C.)
| | - Jong Hoon Chung
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.E.K.); (J.H.)
- BK21 Global Smart Farm Educational Research Center, Seoul National University, Seoul 08826, Korea
- Global Smart Farm Convergence Major, Seoul National University, Seoul 08826, Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
- Correspondence: (K.-J.J.); (J.H.C.); Tel.: +82-55-772-1898 (K.-J.J.); +82-2-880-4601 (J.H.C.)
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Lim JW, Rehman H, Gaba S, Sargeant H, Stevenson IM, Boddie DE. Orthopaedic assessment unit: a service model for the delivery of orthopaedic trauma care in a major trauma centre during the global pandemic (COVID-19). Ann R Coll Surg Engl 2021; 103:167-172. [PMID: 33645286 DOI: 10.1308/rcsann.2020.7069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION We describe a new service model, the Orthopaedic Assessment Unit (OAU), designed to provide care for trauma patients during the COVID-19 pandemic. Patients without COVID-19 symptoms and isolated musculoskeletal injuries were redirected to the OAU. METHODS We prospectively reviewed patients throughput during the peak of the global pandemic (7 May 2020 to 7 June 2020) and compared with our historic service provision (7 May 2019 to 7 June 2019). The Mann-Whitney and Fisher Exact tests were used to test the statistical significance of data. RESULTS A total of 1,147 patients were seen, with peak attendances between 11am and 2pm; 96% of all referrals were seen within 4h. The majority of patients were seen by orthopaedic registrars (52%) and nurse practitioners (44%). The majority of patients suffered from sprains and strains (39%), followed by fractures (22%) and wounds (20%); 73% of patients were discharged on the same day, 15% given follow up, 8% underwent surgery and 3% were admitted but did not undergo surgery. Our volume of trauma admissions and theatre cases decreased by 22% and 17%, respectively (p=0.058; 0.139). There was a significant reduction of virtual fracture clinic referrals after reconfiguration of services (p<0.001). CONCLUSIONS Rapid implementation of a specialist OAU during a pandemic can provide early definitive trauma care while exceeding national waiting time standards. The fall in trauma attendances was lower than anticipated. The retention of orthopaedic staff in the department to staff the unit and maintain a high standard of care is imperative.
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Affiliation(s)
- J W Lim
- Aberdeen Royal Infirmary, Aberdeen, UK
| | - H Rehman
- Aberdeen Royal Infirmary, Aberdeen, UK
| | - S Gaba
- Aberdeen Royal Infirmary, Aberdeen, UK
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Lim JW, McMillan TE, Stevenson IM. Broken guidewire intramedullary: what to do now? Ann R Coll Surg Engl 2021; 103:e56-e58. [PMID: 33559559 PMCID: PMC9897225 DOI: 10.1308/rcsann.2020.7004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Instrument breakage during orthopaedic procedures is relatively uncommon, but it remains a challenging problem to orthopaedic surgeons. We report a case of a broken guidewire during intramedullary nail fixation of a proximal femur fracture with subtrochanteric extension. We also report a simple yet effective technique for removal of a broken guidewire from the medulla of the proximal femur without causing much iatrogenic trauma.
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Affiliation(s)
- JW Lim
- Aberdeen Royal Infirmary, Foresterhill Health Campus, Aberdeen, UK
| | - TE McMillan
- Aberdeen Royal Infirmary, Foresterhill Health Campus, Aberdeen, UK
| | - IM Stevenson
- Aberdeen Royal Infirmary, Foresterhill Health Campus, Aberdeen, UK
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Park S, Kim JE, Han J, Jeong S, Lim JW, Lee MC, Son H, Kim HB, Choung YH, Seonwoo H, Chung JH, Jang KJ. 3D-Printed Poly(ε-Caprolactone)/Hydroxyapatite Scaffolds Modified with Alkaline Hydrolysis Enhance Osteogenesis In Vitro. Polymers (Basel) 2021; 13:257. [PMID: 33466736 PMCID: PMC7830212 DOI: 10.3390/polym13020257] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/08/2021] [Accepted: 01/10/2021] [Indexed: 01/22/2023] Open
Abstract
The 3D-printed bioactive ceramic incorporated Poly(ε-caprolactone) (PCL) scaffolds show great promise as synthetic bone graft substitutes. However, 3D-printed scaffolds still lack adequate surface properties for cells to be attached to them. In this study, we modified the surface characteristics of 3D-printed poly(ε-caprolactone)/hydroxyapatite scaffolds using O2 plasma and sodium hydroxide. The surface property of the alkaline hydrolyzed and O2 plasma-treated PCL/HA scaffolds were evaluated using field-emission scanning microscopy (FE-SEM), Alizarin Red S (ARS) staining, and water contact angle analysis, respectively. The in vitro behavior of the scaffolds was investigated using human dental pulp-derived stem cells (hDPSCs). Cell proliferation of hDPSCs on the scaffolds was evaluated via immunocytochemistry (ICC) and water-soluble tetrazolium salt (WST-1) assay. Osteogenic differentiation of hDPSCs on the scaffolds was further investigated using ARS staining and Western blot analysis. The result of this study shows that alkaline treatment is beneficial for exposing hydroxyapatite particles embedded in the scaffolds compared to O2 plasma treatment, which promotes cell proliferation and differentiation of hDPSCs.
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Affiliation(s)
- Sangbae Park
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (S.J.); (J.W.L.); (M.C.L.); (H.S.); (H.B.K.)
| | - Jae Eun Kim
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.E.K.); (J.H.)
| | - Jinsub Han
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.E.K.); (J.H.)
- BK21 Global Smart Farm Educational Research Center, Seoul National University, Seoul 08826, Korea
| | - Seung Jeong
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (S.J.); (J.W.L.); (M.C.L.); (H.S.); (H.B.K.)
| | - Jae Woon Lim
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (S.J.); (J.W.L.); (M.C.L.); (H.S.); (H.B.K.)
| | - Myung Chul Lee
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (S.J.); (J.W.L.); (M.C.L.); (H.S.); (H.B.K.)
| | - Hyunmok Son
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (S.J.); (J.W.L.); (M.C.L.); (H.S.); (H.B.K.)
| | - Hong Bae Kim
- Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul 08826, Korea; (S.P.); (S.J.); (J.W.L.); (M.C.L.); (H.S.); (H.B.K.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea;
| | - Hoon Seonwoo
- Department of Industrial Machinery Engineering, College of Life Sciences and Natural Resources, Sunchon National University, Suncheon 57922, Korea
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon 57922, Korea
| | - Jong Hoon Chung
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.E.K.); (J.H.)
- BK21 Global Smart Farm Educational Research Center, Seoul National University, Seoul 08826, Korea
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
| | - Kyoung-Je Jang
- Division of Agro-System Engineering, College of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea
- Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea
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12
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Lim JW, Jang KJ, Son H, Park S, Kim JE, Kim HB, Seonwoo H, Choung YH, Lee MC, Chung JH. Aligned Nanofiber-Guided Bone Regeneration Barrier Incorporated with Equine Bone-Derived Hydroxyapatite for Alveolar Bone Regeneration. Polymers (Basel) 2020; 13:polym13010060. [PMID: 33375761 PMCID: PMC7796229 DOI: 10.3390/polym13010060] [Citation(s) in RCA: 8] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/21/2020] [Accepted: 12/22/2020] [Indexed: 01/29/2023] Open
Abstract
Post-surgery failure of dental implants due to alveolar bone loss is currently critical, disturbing the quality of life of senior dental patients. To overcome this problem, bioceramic or bone graft material is loaded into the defect. However, connective tissue invasion instead of osteogenic tissue limits bone tissue regeneration. The guided bone regeneration concept was adapted to solve this problem and still has room for improvements, such as biochemical similarity or oriented structure. In this article, an aligned electrospun-guided bone regeneration barrier with xenograft equine bone-derived nano hydroxyapatite (EBNH-RB) was fabricated by electrospinning EBNH/PCL solution on high-speed rotating drum collector and fiber characterization, viability and differentiation enhancing properties of mesenchymal dental pulp stem cell on the barrier was determined. EBNH-RB showed biochemical and structural similarity to natural bone tissue electron microscopy image analysis and x-ray diffractometer analysis, and had a significantly better effect in promoting osteogenesis based on the increased bioceramic content by promoting cell viability, calcium deposition and osteogenic marker expression, suggesting that they can be successfully applied to regenerate alveolar bone as a guided bone regeneration barrier.
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Affiliation(s)
- Jae Woon Lim
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
| | - Kyoung Je Jang
- Division of Agro-System Engineering, Gyeongsang National University, Jinju 52828, Korea;
| | - Hyunmok Son
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
| | - Sangbae Park
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
| | - Jae Eun Kim
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
| | - Hong Bae Kim
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
| | - Hoon Seonwoo
- Department of Industrial Machinery Engineering, College of Life Science and Natural Resources, Sunchon National University, Sunchon 57922, Korea;
| | - Yun Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea;
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea
| | - Myung Chul Lee
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
- Correspondence: (M.C.L.); (J.H.C.)
| | - Jong Hoon Chung
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Korea; (J.W.L.); (H.S.); (S.P.); (J.E.K.); (H.B.K.)
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
- Correspondence: (M.C.L.); (J.H.C.)
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13
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Ku L, Lee J, Lim JW, Jin L, Seo JT, Kim H. Docosahexaenoic acid inhibits ethanol/palmitoleic acid-induced necroptosis in AR42J cells. J Physiol Pharmacol 2020; 71. [PMID: 33077696 DOI: 10.26402/jpp.2020.3.15] [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] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 06/30/2020] [Indexed: 11/03/2022]
Abstract
Fatty acid ethyl esters (FAEEs), non-oxidative metabolites of ethanol, are the main causative agents of severe acute pancreatitis resulting from alcohol abuse. Pancreatic acinar cells exposed to ethanol in combination with the fatty acid palmitoleic acid (EtOH/POA) display increased levels of palmitoleic acid ethyl ester and cell death. Oxidative stress and acinar cell necroptosis are implicated in the pathology of severe acute pancreatitis. Docosahexaenoic acid (DHA) serves as a powerful anti-oxidant that reduces pancreatic inflammation and improves the outcomes of patients with acute pancreatitis. We investigated whether treatment of EtOH/POA, as an in vitro model of alcoholic pancreatitis, increases reactive oxygen species (ROS), necroptosis-regulating proteins, and cell death by increasing nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activity and intracellular calcium. Also, we investigated whether DHA inhibits EtOH/POA-induced alterations in pancreatic acinar AR42J cells. As a result, EtOH/POA increased intracellular and mitochondrial ROS levels, NADPH oxidase activity, necroptosis-regulating proteins, and cell death, which was inhibited by NADPH oxidase inhibitor apocynin, the Ca2+ chelator BAPTA, and DHA. However, DHA did not reduce EtOH/POA-induced increases in Ca2+ oscillation or levels in AR42J cells. Furthermore, EtOH/POA induced mitochondrial dysfunction by reducing mitochondrial membrane polarization and hence, adenosine triphosphate (ATP) production. DHA treatment attenuated EtOH/POA-induced mitochondrial dysfunction. In conclusion, DHA inhibits EtOH/POA-induced necroptosis by suppressing NADPH oxidase activity, reducing ROS levels, preventing mitochondrial dysfunction, and inhibiting activation of necroptosis-regulating proteins in AR42J cells.
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Affiliation(s)
- L Ku
- Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul, Republic of Korea
| | - J Lee
- Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul, Republic of Korea
| | - J W Lim
- Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul, Republic of Korea
| | - L Jin
- Department of Oral Biology, Yonsei University College of Dentistry, Seoul, Republic of Korea
| | - J T Seo
- Department of Oral Biology, Yonsei University College of Dentistry, Seoul, Republic of Korea
| | - H Kim
- Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul, Republic of Korea.
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Yoon J, Lee H, Lim JW, Kim H. Inhibitory effect of alpha-lipoic acid on mitochondrial dysfunction and interleukin-8 expression in interleukin-1beta-stimulated ataxia teleangiectasia fibroblasts. J Physiol Pharmacol 2020; 71. [PMID: 32554850 DOI: 10.26402/jpp.2020.1.15] [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] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 02/28/2020] [Indexed: 11/03/2022]
Abstract
Ataxia telangiectasia (A-T) is an inherited neurodegenerative disease caused by mutation in the ataxia telangiectasia mutated (ATM) gene, leading to loss of function in the encoded protein ATM. Because ATM functions to reduce oxidative stress by up-regulating antioxidant enzymes, oxidative stress is a prevalent A-T phenotype and a mediator of the inflammation that drives A-T pathology. Reactive oxygen species (ROS) levels and the expression of pro-inflammatory cytokine interleukin-8 (IL-8) were higher in A-T cells than in normal cells. ROS are related to mitochondrial dysfunction and activation of nuclear factor kappa B (NF-κB) to induce IL-8 expression. Alpha-lipoic acid (α-LA), a naturally occurring thiol compound, shows an antioxidant effect in various cells. This study is aimed to determine if α-LA confers protection against NF-κB activation, IL-8 expression, and mitochondrial dysfunction in A-T cells which are exposed to the inflammatory cytokine IL-1β. A-T fibroblasts were treated with or without α-LA. The levels of intracellular and mitochondrial ROS, mRNA and protein levels of IL-8, mitochondrial membrane potential (MMP), ATP levels, and DNA binding activity of NF-κB were determined. As a result, IL-1β increased NF-κB activation, IL-8 expression, intracellular and mitochondrial ROS levels, but decreased MMP and ATP level in A-T cells. Pretreatment of A-T cells with α-LA inhibited IL-1β-induced activation of NF-κB, IL-8 expression, and mitochondrial dysfunction by reducing ROS levels. In conclusion, supplementation with α-LA may be beneficial for reducing the oxidative stress-induced mitochondrial dysfunction and IL-8 production associated with A-T.
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Affiliation(s)
- J Yoon
- Department of Food and Nutrition, Brain Krea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - H Lee
- Department of Food and Nutrition, Brain Krea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - J W Lim
- Department of Food and Nutrition, Brain Krea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - H Kim
- Department of Food and Nutrition, Brain Krea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea.
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15
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Yu JH, Lim JW, Kim H. Pancreatitis-associated protein-1 suppresses apoptosis in cerulein-stimulated pancreatic acinar cells in response to nuclear factor-kappa B activation. J Physiol Pharmacol 2020; 70. [PMID: 32084646 DOI: 10.26402/jpp.2019.6.04] [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] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 12/30/2019] [Indexed: 11/03/2022]
Abstract
Pancreatitis is a disease for which there are numerous etiologies but no effective treatments. Although the expression of the pancreatitis-associated protein-1 (PAP-1) serves as a marker for the disease, its biological function is unknown. The present study was carried out to determine if PAP-1 performs a protective role against oxidative stress-induced pancreatic cell death. For this purpose, we used cerulein-stimulated pancreatic acinar AR42J cells as an experimental model of acute pancreatitis. First, we demonstrated that PAP-1 gene expression is increased by cerulein in a dose- and time-dependent manner. In parallel, the level of active nuclear factor kappaB (NF-κB) was found to be increased in cells treated with cerulein. To test whether activation of the oxidant-sensitive transcription factor NF-κB is mediated by nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, the primary source of reactive oxygen species, cerulein-stimulated NADPH oxidase activity was suppressed by using the NADPH oxidase inhibitor diphenyleneiodonium and, separately, by anti-sense oligonucleotides directed against NADPH oxidase subunits p22phox and p47phox. We observed that a decrease in NADPH oxidase activity resulted in decreased NF-κB activation and decreased PAP-1 gene expression. To determine whether the cerulein-induced NF-κB activation involves PAP-1 expression, cells were transfected to overexpress the MAD3 double-point IκBα mutant. In response, NF-κB activation and PAP-1 gene expression were decreased. Lastly, we observed that the cerulein-induced reduction in cell viability and increase in apoptosis are reversed by overexpression of PAP-1 in PAP-1-transfected cells. Taken together, these results support the postulate that PAP-1 inhibits cerulein-induced apoptosis in response to NADPH oxidase-mediated NF-κB activation in pancreatic acinar cells.
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Affiliation(s)
- J H Yu
- Department of Pharmacology, Yonsei University College of Medicine, Seoul, South Korea.,New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, South Korea.
| | - J W Lim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - H Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
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16
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Kim M, Kim SH, Lim JW, Kim H. Lycopene induces apoptosis by inhibiting nuclear translocation of β-catenin in gastric cancer cells. J Physiol Pharmacol 2019; 70. [PMID: 31741457 DOI: 10.26402/jpp.2019.4.11] [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] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 08/28/2019] [Indexed: 11/03/2022]
Abstract
Reactive oxygen species (ROS) promote the development and progression of cancer by their effects on several signaling pathways. Lycopene, a major carotenoid natural product, is known to display antioxidant activity and to induce apoptosis of cancer cells. The aim of the present study was to investigate the mechanism by which lycopene induces apoptosis of the human gastric cancer AGS cells. In the present study, we showed that lycopene reduces the viability of AGS cells by inducing DNA fragmentation and increasing the Bax/Bcl-2 ratio. To determine the mechanistic basis for these effects, studies were conducted to assess the effects of this carotenoid on activation and nuclear translocation of β-catenin, and the expression of β-catenin target genes in AGS cells. The results showed that lycopene reduces the levels of ROS. It also inhibits activation of β-catenin signaling by changing the Wnt/β-catenin multi-protein complex such as a reduction in phosphorylation of glycogen synthase kinase 3β [GSK3β] and an increase in adenomatous polyposis coli [APC] and β-transducin repeats-containing proteins [β-TrCP]). It suppresses nuclear translocation of β-catenin and the expression of the β-catenin target survival genes c-myc and cyclin D1. Lycopene induces apoptosis by reducing ROS levels and suppressing β-catenin-c-myc/cyclin D1 axis. Thus, lycopene induces apoptosis of gastric cancer cells by disrupting nuclear translocation of β-catenin and expression of key cell survival genes.
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Affiliation(s)
- M Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - S H Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - J W Lim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea
| | - H Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul, South Korea.
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17
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Kwok KO, Li KK, Lee SS, Chng PHY, Wei VWI, Ismail NH, Mosli N, Koh D, Lai A, Lim JW. Multi-centre study on cultural dimensions and perceived attitudes of nurses towards influenza vaccination uptake. J Hosp Infect 2018; 102:337-342. [PMID: 30500386 DOI: 10.1016/j.jhin.2018.11.017] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 11/21/2018] [Indexed: 11/16/2022]
Abstract
This study explored how cultural values affected Health Belief Model (HBM) components and the influenza vaccine uptake among nurses across three Asian populations using a survey conducted in 2017 (N = 3971). The vaccination coverages were 33.5% (Brunei), 35.6% (Hong Kong) and 69.5% (Singapore). Three HBM components (perceived susceptibility, perceived benefits and cues to action) were positively associated with vaccination. A direct negative link and an indirect positive link via HBM were observed between collectivism and vaccination, whereas a negative indirect link via HBM between power distance and vaccination was observed. Cultural values, notably collectivism, advanced HBM to study nurses' vaccination.
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Affiliation(s)
- K O Kwok
- The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China; Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Shatin, Hong Kong, China; Shenzhen Research Institute of the Chinese University of Hong Kong, Shenzhen, China.
| | - K K Li
- Department of Social and Behavioural Sciences, City University of Hong Kong, Hong Kong, China
| | - S S Lee
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - P H Y Chng
- Nursing Administration (Infection Control), Yishun Community Hospital, Singapore
| | - V W I Wei
- The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
| | - N H Ismail
- Occupational Health Division, Public Health Services, Ministry of Health, Brunei Darussalam
| | - N Mosli
- Occupational Health Division, Public Health Services, Ministry of Health, Brunei Darussalam
| | - D Koh
- PAPRSB Institute of Health Sciences, Universiti Brunei Darussalam, Brunei Darussalam; NUS Saw Swee Hock School of Public Health, National University of Singapore, Singapore
| | - A Lai
- Occupational Health Division, Public Health Services, Ministry of Health, Brunei Darussalam; PAPRSB Institute of Health Sciences, Universiti Brunei Darussalam, Brunei Darussalam
| | - J W Lim
- NUS Saw Swee Hock School of Public Health, National University of Singapore, Singapore; Health for Life Center, Khoo Teck Puat Hospital (KTPH), Singapore
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18
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Kwon HJ, Cho YD, Lim JW, Koh HS, Yoo DH, Kang HS, Han MH. Contralateral Approach to Coil Embolization of Proximal A1 Aneurysms Using the Anterior Communicating Artery. AJNR Am J Neuroradiol 2018; 39:2297-2300. [PMID: 30442700 DOI: 10.3174/ajnr.a5875] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 09/28/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Aneurysms arising from the proximal A1 segment of the anterior cerebral artery are rare, and their distinctive configurations often pose technical challenges during endovascular embolization. Herein, we present 11 patients with proximal A1 aneurysms requiring a contralateral approach (via the anterior communicating artery) to coil embolization. MATERIALS AND METHODS From a prospectively collected data repository, we retrieved records of 11 patients consecutively treated for proximal A1 aneurysms between January 2011 and March 2018. In each instance, coil embolization was performed by the contralateral route. Outcomes were analyzed in terms of morphologic features and clinical status. RESULTS Aneurysms in all 11 patients were directed posteriorly and were small (<5 mm). A contralateral approach (via the anterior communicating artery) was used after ipsilateral attempts at aneurysm selection failed in each instance, despite using a variety of microcatheters. Single punctures and single guiding catheters sufficed in 9 patients, but 2 patients required dual punctures and 2 guiding catheters. All endovascular treatments ultimately yielded excellent outcomes. Although 1 symptomatic infarct was manifested in the course of ipsilateral treatment, no morbidity or mortality resulted from the contralateral access. CONCLUSIONS Due to angio-anatomic constraints, a contralateral strategy for coil embolization of proximal A1 aneurysms is acceptable if ipsilateral access is technically prohibitive and the vessels (contralateral A1 and anterior communicating artery) are amenable to the passage of microdevices.
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Affiliation(s)
- H-J Kwon
- From the Department of Neurosurgery (H.-J.K., J.W.L., H.-S. Koh), Regional Cerebrovascular Center, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea
| | - Y D Cho
- Departments of Radiology (Y.D.C., D.H.Y., M.H.H.)
| | - J W Lim
- From the Department of Neurosurgery (H.-J.K., J.W.L., H.-S. Koh), Regional Cerebrovascular Center, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea
| | - H-S Koh
- From the Department of Neurosurgery (H.-J.K., J.W.L., H.-S. Koh), Regional Cerebrovascular Center, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea
| | - D H Yoo
- Departments of Radiology (Y.D.C., D.H.Y., M.H.H.)
| | - H-S Kang
- Neurosurgery (H.-S. Kang), Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - M H Han
- Departments of Radiology (Y.D.C., D.H.Y., M.H.H.)
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Choi S, Lim JW, Kim H. Effect of thiol antioxidants on lipopolysaccharide-induced cyclooxygenase-2 expression in pulmonary epithelial cells. J Physiol Pharmacol 2018; 69. [PMID: 30415238 DOI: 10.26402/jpp.2018.4.04] [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] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 08/30/2018] [Indexed: 11/03/2022]
Abstract
Cyclooxygenase-2 (COX-2) plays an important role in pulmonary inflammatory response, and its expression is regulated by several transcription factors including nuclear factor kappa-B (NF-κB), activator protein-1 (AP-1), and signal transducer and activator of transcription-3 (STAT-3), which are activated by oxidative stress. Glutathione (GSH) and N-acetyl cysteine (NAC) are thiol antioxidants that scavenge reactive oxygen species (ROS). The present study investigated whether lipopolysaccharide (LPS) induces COX-2 expression through ROS generation and the activation of oxidant-sensitive transcription factors such as NF-κB, AP-1, and STAT-3 in pulmonary epithelial A549 cells. The cells were pretreated with GSH or NAC for 1 hour prior to LPS stimulation. Intracellular ROS levels, DNA-binding activities of NF-κB, AP-1, and STAT-3, and mRNA and protein levels of COX-2 were determined. Our results showed that LPS increased ROS levels that peaked at 2 hours. LPS activated NF-κB, AP-1, and STAT-3 and induced the expression of COX-2 in A549 cells in a time-dependent manner. Pretreatment of thiol antioxidants GSH and NAC reduced ROS levels and attenuated the increase in ROS, the activation of NF-κB, AP-1, and STAT-3, and the expression of COX-2 in LPS-treated A549 cells. In conclusion, GSH and NAC suppress COX-2 expression by reducing ROS levels and inhibiting the activation of NF-κB, AP-1, and STAT-3 in pulmonary epithelial A549 cells exposed to LPS. Pretreatment with thiol antioxidants GSH and NAC may be beneficial for the treatment of pulmonary inflammation associated with oxidative stress.
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Affiliation(s)
- S Choi
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, South Korea
| | - J W Lim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, South Korea
| | - H Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, South Korea.
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20
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Chiew CJ, Ho HJ, Win MK, Tan A, Lim JW, Ang B, Chow A. Persistence of meticillin-resistant Staphylococcus aureus carriage in re-admitted patients. J Hosp Infect 2018; 100:350-354. [PMID: 29649554 DOI: 10.1016/j.jhin.2018.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 04/03/2018] [Indexed: 12/01/2022]
Abstract
A retrospective cohort study was conducted to investigate the duration and risk factors for persistence of meticillin-resistant Staphylococcus aureus (MRSA) colonization among known carriers who were re-admitted to hospital. MRSA carriage persisted in a high proportion of known carriers up to two years after their last date of discharge, and re-admission screening should be performed for at least this duration. A targeted screening approach should focus on older patients with a history of long inpatient stays, who are at higher risk of persistent carriage. Timely discharge planning is important in reducing the risk of persistent MRSA colonization among known carriers.
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Affiliation(s)
- C J Chiew
- Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore
| | - H J Ho
- Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore
| | - M K Win
- Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore.
| | - A Tan
- Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore
| | - J W Lim
- Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore
| | - B Ang
- Department of Infectious Diseases, Tan Tock Seng Hospital, Singapore
| | - A Chow
- Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore
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Krishnan S, Rawindran H, Sinnathambi CM, Lim JW. Comparison of various advanced oxidation processes used in remediation of industrial wastewater laden with recalcitrant pollutants. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1757-899x/206/1/012089] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lim JW, Lee HW, Park JT, Ahn SG, Jung J. Abstract P2-01-36: Ex vivo shear-wave elastography of axillary lymph nodes predicting nodal metastasis in patients with primary breast cancer: A pilot study. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p2-01-36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Objective: To evaluate the feasibility of shear-wave elastography using breast ultrasonography in identifying metastasis of removed sentinel lymph nodes during the operation for treatment of breast cancer.
Background: Conventional method for identification of sentinel nodal metastasis is time and cost consuming. The optimal method for identification of nodal status is important.
Methods: Excised sentinel lymph nodes during the operation were prospectively examined with the elastography. Metastatic status of lymph nodes was confirmed with permanent histology. Only macrometastasis was regarded as positive. Elastic values measured by the ex vivo elastography and nodal characteristics were analyzed to correlate with nodal metastasis.
Results: A total of 274 lymph nodes harvested from 68 breast cancer patients at Gangnam Severance Hospital from May 2014 to April 2015 were included this study. There was the difference of elastic values between nodes with and without metastasis (mean stiffness, 41.6 kPa and 17.4 kPa, P < 0.001). Mean sizes of metastatic nodes (range 0.36-2.59 cm) were significantly larger than that of non-metastatic nodes (1.0 cm versus 0.75 cm, P < 0.001). Moreover, there was a correlation between the size of metastatic nodes which ranged from 0.7 to 21.5 mm with a median of 7 mm and nodal stiffness (correlation coefficient of mean stiffness, r = 0.431). The area under the receiver operating characteristic curve (AUC) by the mean stiffness was 0.794. The combination of size of nodes, mean stiffness and ratio made AUC of 0.856.
Conclusions: In our study, ex vivo shear-wave elastography of sentinel lymph nodes was a feasible method to predict metastasis. Through the validation study, ex vivo elastography could be helpful to determine metastasis of sentinel lymph nodes during the operation.
Keywords Breast cancer; Elastography; Lymph node metastasis.
Citation Format: Lim JW, Lee HW, Park JT, Ahn SG, Jung J. Ex vivo shear-wave elastography of axillary lymph nodes predicting nodal metastasis in patients with primary breast cancer: A pilot study [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 P2-01-36.
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Affiliation(s)
- JW Lim
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - HW Lee
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - JT Park
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - SG Ahn
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J Jung
- Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
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Lim JW, Ng GS, Jenkins RC, Ridley D, Jariwala AC, Sripada S. Total hip replacement for neck of femur fracture: Comparing outcomes with matched elective cohort. Injury 2016; 47:2144-2148. [PMID: 27461781 DOI: 10.1016/j.injury.2016.07.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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: 06/05/2016] [Revised: 07/11/2016] [Accepted: 07/18/2016] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Current literature suggests that total hip replacement (THR) is superior to hemiarthroplasty (HA) for neck of femur fracture in selected group of patients. The outcomes of THR undertaken for trauma setting remain unclear when comparing with elective THR. We compared the outcomes of THR trauma cohort with best-matched elective cohort. METHODS We retrospectively reviewed 102 patients that underwent THR due to trauma from 2011 to 2013. We had access to 90 cases with complete records. Another 90 matched elective cases were obtained from local arthroplasty database. The elective cases were matched for gender, surgical approaches, surgeon's grade, types of implant, patient's age at operation date of ±5 years and operation date of ±60days. Subsequently, the selection criteria were relaxed to patient's age at operation date of ±10 years and operation date of ±60days. Unmatched cases were excluded. Complications and death rate were compared. RESULTS The average age for both cohorts was 70 years. The trauma cohort had statistically significant lower BMI and longer hospital stay (p=0.001). The Functional Comorbidity Index (FCI) and Charlson Age Comorbidity Index (CACI) were the same for both cohorts, reflecting an active patient selection for THR in our centre. The trauma cohort had higher surgical complication rate (9% vs 4%), particularly higher dislocation rate (7% vs 1%); and higher medical complication rate (32% vs 6%). These were consistent with the literature. Contrary to literature, the trauma cohort had six dislocations that five of them were done via anterolateral approach. Among the eight trauma cases with surgical complications, six cases were performed by trainees. The cause of surgical complications remains unclear due to the nature of retrospective study. The trauma cohort had higher death rate than the elective cohort (14% vs 4%), with one post-operative cardiac arrest in the trauma cohort. The rest were non-orthopaedic related deaths, ranging between four months to four years. CONCLUSION A more robust way of selecting trauma patients for THR is warranted to reduce morbidity and mortality. Follow-up for the trauma cohort is warranted, as the patients are likely to outlive the implants.
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Affiliation(s)
- J W Lim
- Department of Orthopaedics and Trauma, Ninewells Hospital, Dundee, DD1 9SY, UK.
| | - G S Ng
- University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK
| | - R C Jenkins
- University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK
| | - D Ridley
- Department of Orthopaedics and Trauma, Ninewells Hospital, Dundee, DD1 9SY, UK
| | - A C Jariwala
- Department of Orthopaedics and Trauma, Ninewells Hospital, Dundee, DD1 9SY, UK
| | - S Sripada
- Department of Orthopaedics and Trauma, Ninewells Hospital, Dundee, DD1 9SY, UK
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Abstract
Many studies exist for reconstructing gene regulatory networks (GRNs). In this paper, we propose a method based on an advanced neuro-fuzzy system, for gene regulatory network reconstruction from microarray time-series data. This approach uses a neural network with a weighted fuzzy function to model the relationships between genes. Fuzzy rules, which determine the regulators of genes, are very simplified through this method. Additionally, a regulator selection procedure is proposed, which extracts the exact dynamic relationship between genes, using the information obtained from the weighted fuzzy function. Time-series related features are extracted from the original data to employ the characteristics of temporal data that are useful for accurate GRN reconstruction. The microarray dataset of the yeast cell cycle was used for our study. We measured the mean squared prediction error for the efficiency of the proposed approach and evaluated the accuracy in terms of precision, sensitivity, and F-score. The proposed method outperformed the other existing approaches.
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Affiliation(s)
- B H Wang
- Artificial Intelligence Lab, Computer Science Department, IT College, Gachon University, Seongnam, South Korea
| | - J W Lim
- Artificial Intelligence Lab, Computer Science Department, IT College, Gachon University, Seongnam, South Korea
| | - J S Lim
- Artificial Intelligence Lab, Computer Science Department, IT College, Gachon University, Seongnam, South Korea
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Ahamed A, Chen CL, Rajagopal R, Wu D, Mao Y, Ho IJR, Lim JW, Wang JY. Multi-phased anaerobic baffled reactor treating food waste. Bioresour Technol 2015; 182:239-244. [PMID: 25704096 DOI: 10.1016/j.biortech.2015.01.117] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 01/26/2015] [Accepted: 01/28/2015] [Indexed: 06/04/2023]
Abstract
This study was conducted to identify the performance of a multi-phased anaerobic baffled reactor (MP-ABR) with food waste (FW) as the substrate for biogas production and thereby to promote an efficient energy recovery and treatment method for the wastes with high organic solid content through phase separation. A four-chambered ABR was operated at an HRT of 30 days with an OLR of 0.5-1.0 g-VS/Ld for a period of 175 days at 35 ± 1°C. Consistent overall removal efficiencies of 85.3% (CODt), 94.5% (CODs), 89.6% (VFA) and 86.4% (VS) were observed throughout the experiment displaying a great potential to treat FW. Biogas generated was 215.57 mL/g-VS removed d. Phase separation was observed and supported by the COD and VFA trends, and an efficient recovery of bioenergy from FW was achieved.
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Affiliation(s)
- A Ahamed
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore.
| | - C-L Chen
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore
| | - R Rajagopal
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore
| | - D Wu
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Y Mao
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore
| | - I J R Ho
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore
| | - J W Lim
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore
| | - J-Y Wang
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, #06-08 CleanTech One, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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Lim JW, Chen CL, Ho IJR, Wang JY. Study of microbial community and biodegradation efficiency for single- and two-phase anaerobic co-digestion of brown water and food waste. Bioresour Technol 2013; 147:193-201. [PMID: 23999255 DOI: 10.1016/j.biortech.2013.08.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 08/04/2013] [Accepted: 08/06/2013] [Indexed: 05/16/2023]
Abstract
The objective of this work was to study the microbial community and reactor performance for the anaerobic co-digestion of brown water and food waste in single- and two-phase continuously stirred tank reactors (CSTRs). Bacterial and archaeal communities were analyzed after 150 days of reactor operation. As compared to single-phase CSTR, methane production in two-phase CSTR was found to be 23% higher. This was likely due to greater extent of solubilization and acidification observed in the latter. These findings could be attributed to the predominance of Firmicutes and greater bacterial diversity in two-phase CSTR, and the lack of Firmicutes in single-phase CSTR. Methanosaeta was predominant in both CSTRs and this correlated to low levels of acetate in their effluent. Insights gained from this study would enhance the understanding of microorganisms involved in co-digestion of brown water and food waste as well as the complex biochemical interactions promoting digester stability and performance.
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Affiliation(s)
- J W Lim
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; Division of Environmental and Water Resources, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
| | - C-L Chen
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
| | - I J R Ho
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
| | - J-Y Wang
- Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; Division of Environmental and Water Resources, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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Chen Y, Tai BC, Nayak D, Kumar N, Chua KH, Lim JW, Goy RWL, Wong HK. Blood loss in spinal tumour surgery and surgery for metastatic spinal disease: a meta-analysis. Bone Joint J 2013; 95-B:683-8. [PMID: 23632682 DOI: 10.1302/0301-620x.95b5.31270] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
There is currently no consensus about the mean volume of blood lost during spinal tumour surgery and surgery for metastatic spinal disease. We conducted a systematic review of papers published in the English language between 31 January 1992 and 31 January 2012. Only papers that clearly presented blood loss data in spinal surgery for metastatic disease were included. The random effects model was used to obtain the pooled estimate of mean blood loss. We selected 18 papers, including six case series, ten retrospective reviews and two prospective studies. Altogether, there were 760 patients who had undergone spinal tumour surgery and surgery for metastatic spinal disease. The pooled estimate of peri-operative blood loss was 2180 ml (95% confidence interval 1805 to 2554) with catastrophic blood loss as high as 5000 ml, which is rare. Aside from two studies that reported large amounts of mean blood loss (> 5500 ml), the resulting funnel plot suggested an absence of publication bias. This was confirmed by Egger's test, which did not show any small-study effects (p = 0.119). However, there was strong evidence of heterogeneity between studies (I(2) = 90%; p < 0.001). Spinal surgery for metastatic disease is associated with significant blood loss and the possibility of catastrophic blood loss. There is a need to establish standardised methods of calculating and reporting this blood loss. Analysis should include assessment by area of the spine, primary pathology and nature of surgery so that the amount of blood loss can be predicted. Consideration should be given to autotransfusion in these patients.
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Affiliation(s)
- Y Chen
- National University Health System, Department of Orthopaedic Surgery, NUHS Tower Block, Level 11, 1E Kent Ridge Road, 119228, Singapore
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Kim EH, Park BH, Lim JW, Jung SW. Late diagnosis of Henoch-Schönlein purpura following detection of jejunal ischemia on conventional endoscopy. Endoscopy 2013; 44 Suppl 2 UCTN:E393-4. [PMID: 23139038 DOI: 10.1055/s-0032-1310247] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- E H Kim
- Department of Internal Medicine, University of Ulsan College of Medicine, Ulsan University Hospital, Ulsan, Korea
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Cha B, Lim JW, Kim KH, Kim H. 15-deoxy-D12,14-prostaglandin J2 suppresses RANTES expression by inhibiting NADPH oxidase activation in Helicobacter pylori-infected gastric epithelial cells. J Physiol Pharmacol 2011; 62:167-174. [PMID: 21673364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Accepted: 04/28/2011] [Indexed: 05/30/2023]
Abstract
UNLABELLED Peroxisome proliferators-activated receptor-γ (PPAR-γ) is a ligand-activated transcription factor. 15 deoxy-(12,14) prostaglandin J(2) (15d-PGJ(2)) is a potent PPAR-γ ligand and acts as an anti-inflammatory agent via PPAR-γ-dependent and independent mechanisms. Helicobacter pylori (H. pylori) induces gastric inflammation by inducing the activation of oxidant-sensitive transcription factor NF-κB and cytokine expression in gastric epithelial cells. Since 15d-PGJ(2) inhibits NF-κB activation in various cells, it may suppress H. pylori-induced inflammatory signaling and cytokine expression in gastric epithelial cells. The present study aims to determined the effect of 15d-PGJ(2) on the activation of inflammatory mediators Jak/Stat (Janus kinase/signal transducers and activators of transcription) and induction of cytokine RANTES in H. pylori-infected gastric epithelial AGS cells. Since NADPH oxidase is a candidate for the production of reactive oxygen species in H. pylori-infected gastric epithelial cells, we determined the effect of 15d-PGJ(2) on the activation of NADPH oxdase. AGS cells were cultured in the presence of H. pylori treated with or without 15d-PGJ(2). The activations of NADPH oxidase and Jak1/Stat3, the levels of H(2)O(2) and RANTES in the medium, and DNA binding activity of Stat3 were assessed. A Jak/Stat3 specific inhibitor AG490 and an inhibitor of NADPH oxidase diphenyleneiodonium (DPI) were treated to determine the direct involvement of Jak/Stat and NADPH oxidase on the production of H(2)O(2) and RANTES in H. pylori-infected cells. H. pylori induced the production of H(2)O(2) and RANTES as well as the activations of NADPH oxidase and Jak1/Stat3, which were inhibited by the treatment of 15d-PGJ(2). DPI suppressed H. pylori-induced alterations similar to 15d-PGJ(2). However, AG490 had no effect on NADPH oxidase activation, but reduced the level of RANTES in the medium released from H. pylori-infected cells. CONCLUSION NADPH oxidase activation is an upstream signaling of Jak1/Stat3 activation and induction of RANTES in H. pylori-infected AGS cells. 15d-PGJ(2), inhibits the activations of NADPH oxidase and Jak1/Stat3 and RANTES expression, suggesting that 15d-PGJ(2) may be beneficial for the treatment of H. pylori-induced gastric inflammation.
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Affiliation(s)
- B Cha
- Department of Pharmacology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
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Yang DM, Kim HC, Nam DH, Jahng GH, Huh CY, Lim JW. Time-resolved MR angiography for detecting and grading ovarian venous reflux: comparison with conventional venography. Br J Radiol 2011; 85:e117-22. [PMID: 21385913 DOI: 10.1259/bjr/79155839] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE The purpose of this study was to compare the diagnostic accuracy of time-resolved MR angiography (TR-MRA) with that of conventional venography for the detection and grading of ovarian venous reflux, which aid in the diagnosis of pelvic venous congestion. METHODS We performed a retrospective analysis of 19 consecutive patients who underwent TR-MRA and conventional venography. The images were analysed by two radiologists in a randomised "blinded" manner. With the use of conventional venography as a gold standard, the images were reviewed to determine if differences in the detection and grading of ovarian venous reflux were seen between TR-MRA and conventional venography; the sensitivity, specificity and accuracy of TR-MRA compared with that of conventional venography were evaluated. The McNemar test was performed to determine the significance of any differences. Interobserver agreement was analysed using generalised κ statistics. RESULTS There was no significant difference between TR-MRA and conventional venography for grading ovarian venous reflux (p>0.05). The sensitivity, specificity and diagnostic accuracy of TR-MRA were found to be 66.7%, 100% and 78.9%, and 75%, 100% and 84.2%, respectively, for the two observers. The weighted κ-values indicated excellent agreement between the two observers for grading ovarian venous reflux on TR-MRA (κ = 0.894). CONCLUSION TR-MRA is an accurate method for accessing pelvic venous congestion.
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Affiliation(s)
- D M Yang
- Department of Radiology, Kyung Hee University East-West Neo Medical Center, Seoul, Republic of Korea
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Seo JY, Yu JH, Lim JW, Mukaida N, Kim H. Nitric oxide-induced IL-8 expression is mediated by NF-kappaB and AP-1 in gastric epithelial AGS cells. J Physiol Pharmacol 2009; 60 Suppl 7:101-106. [PMID: 20388952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 12/20/2009] [Indexed: 05/29/2023]
Abstract
UNLABELLED Inducible nitric oxide synthase (iNOS) and interleukin-8 (IL-8) mediate gastric inflammation. Nitric oxide (NO) produced by iNOS may activate oxidant-sensitive transcription factors. There are the binding sites for NF-kappaB, AP-1, and C/EBP (CCAAT/enhancer binding protein) in the promoter regions of IL-8 gene. The present study aims to investigate whether NO donors, SIN-1 and NOC-18, activate oxidant-sensitive transcription factors NF-kappaB and AP-1 as well as C/EBP to induce IL-8 expression in gastric epithelial AGS cells. Gastric epithelial AGS cells were treated with NO donors, SIN-1 and NOC-18. mRNA expression and protein level of IL-8 in the medium were determined. Nitrite level in the medium and DNA binding activities of NF-kappaB, AP-1, and C/EBP were assessed. NO donors induced the increase in the levels of IL-8 and nitrite in the medium as well as mRNA expression of IL-8 in AGS cells time-dependently. The induction of IL-8 by NO donors was accompanied with the activation of NF-kappaB and AP-1 but not C/EBP in AGS cells. CONCLUSION Large amount of NO, which may be produced by iNOS, may induce the activation of NF-kappaB and AP-1 and the expression of IL-8 in gastric epithelial cells.
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Affiliation(s)
- J Y Seo
- Department of Food and Nutrition, Brain Korea 21 Project, College of Human Ecology, Yonsei University, Seoul, Korea
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Jang SH, Lim JW, Kim H. Beta-carotene inhibits Helicobacter pylori-induced expression of inducible nitric oxide synthase and cyclooxygenase-2 in human gastric epithelial AGS cells. J Physiol Pharmacol 2009; 60 Suppl 7:131-137. [PMID: 20388956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 12/11/2009] [Indexed: 05/29/2023]
Abstract
UNLABELLED Reactive oxygen species (ROS) play critical roles in Helicobacter pylori (H. pylori)-associated gastric ulceration and carcinogenesis. Inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) are involved in H. pylori-induced gastric diseases. Previously we demonstrated that H. pylori in Korean isolates induced the activation of mitogen-activated protein kinases (MAPK) and oxidant-sensitive transcription factors NF-kappaB and AP-1 which mediates the expression of iNOS and COX-2 in gastric epithelial AGS cells. beta-Carotene shows antioxidant activity and inhibits NF-kappaB-dependent gene expression in various cells. Present study aims to investigate whether beta-carotene inhibits H. pylori-induced expression of iNOS and COX-2 by suppressing the activation of MAPK, NF-kappaB, and AP-1 in gastric epithelial AGS cells. HP99 (H. pylori in Korean isolates) was added to AGS cells at the ratio of bacterium/cell, 300/1. beta-carotene inhibited H. pylori-induced increase in ROS level, the activation of MAPK (p38, the c-Jun NH2-terminal protein kinases, the extracellular signal-regulated kinases), NF-kappaB, and AP-1 and the expression of iNOS and COX-2 in AGS cells. CONCLUSION beta-carotene inhibits oxidant-mediated activation of inflammatory signaling and suppresses the expression of iNOS and COX-2 in gastric epithelial AGS cells infected with H. pylori.
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Affiliation(s)
- S H Jang
- Research Institute of Food and Nutritional Sciences, Yonsei University, Seoul, Korea
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Rho BS, Hwang SH, Lim JW, Kim GW, Cho CH, Lee WJ. Intra-system optical interconnection module directly integrated on a polymeric optical waveguide. Opt Express 2009; 17:1215-1221. [PMID: 19188948 DOI: 10.1364/oe.17.001215] [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: 05/27/2023]
Abstract
A new intra-system optical interconnection module directly integrated on a polymeric optical waveguide is suggested. A polymeric optical waveguide plays a role in the propagation path of optical signals from the transmitter to the receiver and in a platform integrated with various optical/electrical devices such as a vertical cavity surface emitting laser, photodiode, very large scale integrated circuit chips, and electrical connectors. Because the polymeric optical waveguide is simultaneously used as an integrated platform, the fabrication process of the optical interconnection module is very simple, and the proposed process is compatible with the conventional printed circuit board process. The suggested optical interconnection was also successfully demonstrated with a 5-Gb/s data transmission through the module directly integrated on a polymeric optical waveguide.
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Affiliation(s)
- B S Rho
- Integrated Optical Module Laboratory, Korea Photonics Technology Institute, Gwangju 500-460, Korea
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Hwang SH, Lee WJ, Lim JW, Jung KY, Cha KS, Rho BS. Chip- and board-level optical interconnections using rigid flexible optical electrical printed circuit boards. Opt Express 2008; 16:8077-8083. [PMID: 18545520 DOI: 10.1364/oe.16.008077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A new optical interconnection scheme based on a rigid flexible optical electrical printed circuit board (RFOE-PCB) is suggested. The easily installed RFOE-PCB can be universally applied for both chip- and board-level optical interconnections. This letter describes the detailed fabrication process, optical properties, and heat-resisting property of the RFOE-PCB. The fabricated RFOE-PCB was also successfully demonstrated with a 2.5-Gb/s data transmission through a 45 degrees-ended optical waveguide embedded in the RFOE-PCB.
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Affiliation(s)
- S H Hwang
- Integrated Optical Module Laboratory, Korea Photonics Technology Institute, Gwangju 500-460, Korea
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Yin XX, Kong KM, Lim JW, Ng BWH, Ferguson B, Mickan SP, Abbott D. Enhanced T-ray signal classification using wavelet preprocessing. Med Biol Eng Comput 2007; 45:611-6. [PMID: 17450389 DOI: 10.1007/s11517-007-0185-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Accepted: 03/23/2007] [Indexed: 10/23/2022]
Abstract
This study demonstrates the application of one-dimensional discrete wavelet transforms in the classification of T-ray pulsed signals. Fast Fourier transforms (FFTs) are used as a feature extraction tool and a Mahalanobis distance classifier is employed for classification. Soft threshold wavelet shrinkage de-noising is used and plays an important role in de-noising and reconstruction of T-ray pulsed signals. An iterative algorithm is applied to obtain three optimal frequency components and to achieve preferred classification performance.
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Affiliation(s)
- X X Yin
- Centre for Biomedical Engineering and School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
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Yeap JS, Lim JW, Vergis M, Au Yeung PS, Chiu CK, Singh H. Prophylactic antibiotics in orthopaedic surgery: guidelines and practice. Med J Malaysia 2006; 61:181-8. [PMID: 16898309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The national clinical practice guideline has recommended that prophylactic antibiotic be given in orthopaedic surgery involving joint replacements and internal fixation of fractures. The aim of this study is to assess the current antibiotics prophylaxis practice in a state level hospital. One hundred and three patients (68 males, 35 females; mean age 41.6 +/- 22.2 years) undergoing internal fixation for closed fractures and joint replacement surgery were included in this prospective study. The choice of pre and post-operative antibiotics, their dosages and duration of administration were recorded. The pre-operative antibiotics were only deemed to have been given if it was documented in the case notes and in the case of post-operative antibiotics if it was signed on the drug chart. Eighty eight percent were given pre-operative prophylactic antibiotics and 92% were given post-operative antibiotics. For patients undergoing internal fixation of fractures, the most commonly used antibiotic for both pre and post-op is intravenous cefuroxime. For joint replacement surgery, the most commonly used antibiotic is intravenous cefoperazone. The duration or number of doses of post-operative antibiotics was highly variable. It was not stated in 56% of the post-operative instructions. Post-operative antibiotic was ordered for 48 hours or longer in 10%. In conclusion, prophylactic antibiotics appear to be widely practised. The first line antibiotics as recommended by the present guideline were not given in any of the patients. Second generation followed by third generation cephalosporins are the most popular antibiotics, with a trend towards using third generation cephalosporins in arthroplasty patients. Single dose prophylaxis was rarely practised.
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Affiliation(s)
- J S Yeap
- International Medical University, Jalan Rasah, Seremban, Negeri Sembilan
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Suh MK, Lim JW, Lee YH, Ha GY, Kim H, Kim JR, Yaguchi T, Nishimura K. Subcutaneous hyalohyphomycosis due to Cephalotheca foveolata
in an immunocompetent host. Br J Dermatol 2006; 154:1184-9. [PMID: 16704653 DOI: 10.1111/j.1365-2133.2006.07158.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the first case of subcutaneous hyalohyphomycosis caused by the genus Cephalotheca, which has not been reported to cause human infection. A 67-year-old immunocompetent farmer presented with a 10-year history of verrucous erythematous plaques on the right foot dorsum, great toe, heel and sole. Histopathology of the lesions revealed chronic granulomatous inflammation with numerous nonpigmented fungal spores in the dermis. Cultures of biopsy specimens on Sabouraud's dextrose agar for 2 weeks developed into yellowish brown, velvety colonies that subsequently turned black after 8 weeks because of the production of black cleistothecia indicating the teleomorph. On the basis of mycological features, scanning electron microscopic morphology and molecular analysis data, a new species of Cephalotheca was identified and designated Cephalotheca foveolata. Because there was no response to the antifungal agents administered, the patient was successfully treated by surgical excision with skin graft.
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Affiliation(s)
- M K Suh
- Department of Laboratory Medicine, College of Medicine, Gyeongju Hospital of Dongguk University, Seokjang-dong, Gyeongju 780-350, South Korea
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Abstract
OBJECTIVE To evaluate the sonographic findings of solid and papillary epithelial neoplasm of the pancreas, a rare tumor occurring in young women. METHODS The sonographic findings of 11 cases of pathologically proven solid and papillary epithelial neoplasm of the pancreas were retrospectively evaluated. RESULTS In 6 cases (55%), combined cystic and solid portions of the masses were observed, whereas only solid-looking masses without anechoic cystic portions were seen in 4 cases (36%). One case (9%) had marginal calcification, consequently, the internal architecture was not evaluated by sonography. Internal echoes were seen in 3 of 6 cystic and solid masses. Septa were seen in 3 cases. Among 11 cases of solid and papillary epithelial neoplasm, tumor margins were well defined in 10, and tumor capsules were detected in 9 (echogenic in 7 and hypoechoic in 2). Calcifications were seen in 3 cases (27%). CONCLUSIONS The characteristic sonographic findings of solid and papillary epithelial neoplasm were well-encapsulated, cystic, and solid masses, but sometimes the mass was seen as a pure solid-looking mass or had internal septations or calcifications.
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Affiliation(s)
- D H Lee
- Department of Diagnostic Radiology, Kyung Hee University Hospital, Seoul, Korea
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Abstract
Oxygen radicals are considered as an important regulator in the pathogenesis of Helicobacter pylori (H. pylori)-induced gastric ulceration and carcinogenesis. Inflammatory genes including inducible nitric oxide synthase (iNOS) may be regulated by oxidant-sensitive transcription factor, nuclear factor-kappaB (NF-kappaB). iNOS induction has been related to gastric apoptosis. We studied the role of NF-kappaB on iNOS expression and apoptosis in H. pylori-stimulated gastric epithelial AGS cells. AGS cells were treated with antisense oligonucleotide (AS ODN) for NF-kappaB subunit p50, an antioxidant enzyme catalase, an inhibitor of NF-kappaB activation pyrrolidine dithiocarbamate (PDTC), iNOS inhibitors N(G)-nitro-L-arginine-methyl ester (L-NAME) and 2-amino-5,6-dihydro-6-methyl-4H-1,3-thiazine (AMT), a peroxynitrite donor SIN-1, and a nitric oxide donor NOC-18 in the presence or absence of H. pylori. H. pylori induced cytotocixity time- and dose-dependently, which occurred with induction in iNOS expression and nitrite production. SIN-1 and NOC-18 induced dose-dependent cytotoxicity in AGS cells. Catalase, PDTC, L-NAME, and AMT prevented H. pylori-induced cytotoxicity and apoptosis. It was related to their inhibition on iNOS expression and nitrite production. The cells treated with AS ODN had low levels of p50 and NF-kappaB and inhibited H. pylori-induced cytotoxicity, apoptosis, iNOS expression, and nitrite production. In conclusion, NF-kappaB plays a novel role in iNOS expression and apoptosis in H. pylori-infected gastric epithelial cells.
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Affiliation(s)
- J W Lim
- Department of Pharmacology and Institute of Gastroenterology, Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul 120-752, South Korea
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Cho BS, Choi YM, Kang HH, Park SJ, Lim JW, Yoon TY. Diagnosis of nut-cracker phenomenon using renal Doppler ultrasound in orthostatic proteinuria. Nephrol Dial Transplant 2001; 16:1620-5. [PMID: 11477164 DOI: 10.1093/ndt/16.8.1620] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND We evaluated the efficacy of non-invasive renal Doppler ultrasound (US) to detect the nut-cracker phenomenon (NCP) and we studied the prevalence of NCP in children with orthostatic proteinuria. METHODS Among a total 66 cases of orthostatic proteinuria, 39 cases of NCP were found, with 27 cases being detected in a normal control group. Using Doppler US, the anteroposterior (AP) diameter and peak velocity (PV) of the left renal vein (LRV) were measured at the hilar and aortomesenteric portion. We calculated the ratio of AP and PV diameters between the two portions. The parameters were analysed using Student's t-test. RESULTS The AP diameters and the ratio in the hilar and narrow portions were all significantly different between the two groups (P<0.01). The PV in the narrow portion and the ratio of PV were significantly different (P<0.01), but the PV in the hilar portion was not statistically different between the two groups (P>0.05). If the diagnostic criteria for NCP was that the ratio of PV was more than 5, then 22 subjects (56.4%) in the orthostatic proteinuria group and none in the control group could be diagnosed as NCP. If, however, the cut-off values for the diagnosis of NCP were set at the mean+/-2 SD of the ratio (PV ratio 3.98 and size ratio 4.16), then the orthostatic proteinuria group showed abnormal AP diameter in 25 (64.1%), peak velocity in 28 (71.8%), and both in 21 patients (53.8%), and the control group showed an abnormal AP diameter in one subject (3.7%). CONCLUSIONS NCP may be one of the leading causes of orthostatic proteinuria, and non-invasive renal Doppler US may be a useful diagnostic tool in the screening of NCP. In the future, the diagnostic criteria of NCP must be redefined in children.
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Affiliation(s)
- B S Cho
- Department of Pediatrics, College of Medicine, Kyung Hee University, Seoul, Korea
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41
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Kim H, Lim JW, Kim KH. Helicobacter pylori-induced expression of interleukin-8 and cyclooxygenase-2 in AGS gastric epithelial cells: mediation by nuclear factor-kappaB. Scand J Gastroenterol 2001; 36:706-16. [PMID: 11444469 DOI: 10.1080/003655201300191969] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Helicobacter pylori infection might activate nuclear factor-kappaB (NF-kappaB), a transcriptional regulator of inducible expression of inflammatory genes, interleukin-8 (IL-8) and cyclooxygenase-2 (COX-2). We studied the role of NF-kappaB on expression of IL-8 and COX-2 in H. pylori-stimulated AGS gastric epithelial cells by using antisense oligonucleotide (AS ODN) for NF-kappaB subunit p50 and an antioxidant, glutathione (GSH) as well as a NF-kappaB inhibitor, pyrrolidine dithiocarbamate (PDTC). METHODS AGS cells were treated with p50 AS ODN, GSH or PDTC in the presence of H. pylori. mRNA expression and protein levels for IL-8 and COX-2 were determined by Northern blot analysis and Western blot analysis. Levels of IL-8, 6-keto-prostaglandin F1alpha (6-keto-PGF1alpha) and thromboxane B2 (TXB2) were measured in the medium by enzyme-linked immunosorbent assay. NF-kappaB activation was examined by electrophoretic mobility shift assay. RESULTS H. pylori induced a time-dependent expression of mRNA and protein for IL-8 and COX-2 via activation of NF-kappaB and increased the levels of IL-8, 6-keto-PGF1alpha and TXB2, which were inhibited by GSH and PDTC. H. pylori-induced expression of IL-8 and COX-2 was blocked in AGS cells transfected with p50 AS ODN. CONCLUSION NF-kappaB may play a novel role in expression of IL-8 and COX-2 in H. pylori-induced gastric inflammation.
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Affiliation(s)
- H Kim
- Dept. of Pharmacology and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
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Lee SY, Lim JW, Kim YM. Effect of alpha1-acid glycoprotein expressed in cancer cells on malignant characteristics. Mol Cells 2001; 11:341-5. [PMID: 11459224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
Abstract
The alpha1-acid glycoprotein (AAG) is a prototypical serum acute phase reactant in most mammalian species; it is synthesized mainly in liver parenchymal cells. Recently, we found that mRNAs of AAG were expressed in non-hepatic cancer cells, and the expression levels were regulated by the cytokines--IL-1, IL-6, and TNF-alpha. The functional role of AAG in non-hepatic cancer cells has not yet been established. In order to understand the functional role of the AAG expressed in HT-29 cells, the cancer cells were transfected with cloned cDNA for AAG, or exposed to antisense oligodeoxynucleotide (ODN) for AAG. The colony-forming capacity, invasion, and adhesion to laminin of these transformed cancer cells were measured. Overexpression of AAG by transfection, and inhibition of the AAG expression by antisense ODNs were identified by Western blot as well as nested reverse transcriptase-polymerase chain reaction (nested RT-PCR), respectively. Results showed that the overexpression of AAG by transfection reduced colony-forming capacities, invasion, and adhesion to laminin of the cancer cells; on the other hand, the antisense ODN for AAG elevated colony-forming capacities, invasion, and adhesion to laminin of the cancer cells. These results suggest that AAG, expressed in cancer cells inhibited proliferation, invasion, and metastasis of the cancer cells.
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Affiliation(s)
- S Y Lee
- Department of Natural Sciences, College of Medicine, The Catholic University of Korea, Seoul.
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Abstract
The purpose of this study was to compare the diagnostic accuracy of hydro-ultrasonography (US) and spiral computed tomography (CT) in the staging of gastric cancer. Forty-three patients with gastric cancers confirmed at surgery underwent hydro-US and spiral CT on the same day prospectively. Hydro-US and spiral CT were done after ingestion of water. US and CT images were independently analyzed. After surgery, pathological findings according to TNM classification were compared with US and CT findings. The detection rate for T1 tumors was 75% (12/16), and all T2-T4 tumors were detected (27/27). In the T class, good correlation with pathology occurred in 55.8% of cases for US and 58.1% for CT, and there was no difference in staging accuracy between US and CT (P=.7667). Overstaging occurred in 14% for US and CT. Understaging occurred in 30.2% for US and 27.9% for CT. In the N class, good correlation with pathology occurred in 60.5% for US and 55.8% for CT, and there was no difference in staging accuracy between US and CT (P=.0949). Overstaging occurred in 4.7% for US and 18.6% for CT, and understaging occurred in 34.9% and 25.6%, respectively. The diagnostic accuracy of hydro-US and spiral CT in the staging of gastric cancer was between 55.8% and 60.5%, and there was no significant difference in staging accuracy between hydro-US and spiral CT, except for a tendency to overstaging by CT and understaging by US in the N class (P<.05).
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Affiliation(s)
- D H Lee
- Department of Diagnostic Radiology, Kyung Hee University Hospital, 1, Hoeki-dong, Dongdaemun-ku, Seoul 130-702, South Korea.
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44
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Lee Y, Lim JW, Kim YM, Lee IH, Choi YC, Park KC. Induction of alpha1-acid glycoprotein mRNA by cytokines and differentiation in human colon carcinoma cell. Mol Cells 2001; 11:164-9. [PMID: 11355696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
The mRNA for the alpha1-acid glycoprotein (AAG) was expressed not only in hepatoma cells, but also in non-hepatic cancer cells. The expression of the AAG mRNA in HT-29 human colon carcinoma cells is induced by cytokines, IL-6, IL-1, and TNF-alpha, in a manner characteristic of the acute phase response, and the expression of AAG mRNA was up-regulated in differentiated HT-29 cells.
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Affiliation(s)
- Y Lee
- Department of Natural Sciences, College of Medicine, The Catholic University of Korea, Seoul.
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Friedman M, Lim JW, Manders E, Schaffner AD, Kirshenbaum GL, Tanyeri HM, Caldarelli DD, Coon JS. Prognostic significance of Bcl-2 and p53 expression in advanced laryngeal squamous cell carcinoma. Head Neck 2001; 23:280-5. [PMID: 11400228 DOI: 10.1002/hed.1031] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Proteins regulating the cell cycle and cell death are frequently abnormally expressed in cancer. Several of these, particularly p53 and Bcl-2, have been widely suggested as possible prognostic markers in diverse human malignancies. Their role in predicting outcome in squamous cell carcinomas of the head and neck is unclear and may depend on the location, stage, and treatment of the tumor. METHODS To assess this question specifically for advanced squamous cell carcinoma of the larynx, we studied 69 patients with stage III or IV tumors, all but 6 of whom were treated with surgery plus postoperative irradiation by a single physician. We studied the patients retrospectively to test the association between expression of Bcl-2 and p53, as assessed by immunohistochemistry, with treatment outcome and survival. RESULTS Twenty of the 69 patients died from their tumor (poor outcome); the rest were alive and tumor free at the last follow-up or died of unrelated causes without clinical tumor recurrence (good outcome). Fourteen tumors had detectable Bcl-2 expression, including 8 scored as overexpressors. Thirty-nine tumors overexpressed p53. Expression of neither Bcl-2 nor p53 was associated with outcome, overall survival, or disease-free survival. Only tumor stage was significantly associated with outcome and disease-free survival. CONCLUSION These data indicate that assessing expression of p53 or Bcl-2 is unlikely to be prognostically useful for surgically treated advanced laryngeal carcinoma.
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Affiliation(s)
- M Friedman
- Department of Otolaryngology, Rush Medical College of Rush University, Rush-Presbyterian-St. Luke's Medical Center, 30 North Michigan Avenue, Suite 1107, Chicago, Illinois 60602, USA
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Abstract
Nuclear factor-kappaB (NF-kappaB) is a transcriptional regulator of inducible expression of genes including cyclooxygenase-2 (COX-2), regulating cell proliferation. NF-kappaB is kept silent in the cytoplasm via interaction with the inhibitory protein IkappaBalpha and transmigrated into the nucleus upon activation. However, constitutive NF-kappaB has been found in the nucleus of some cancer cells. We investigated the role of NF-kappaB in COX-2 expression and cell proliferation in human gastric cancer AGS cells. AGS cells were treated with antisense oligodeoxynucleotide (AS ODN) or sense oligodeoxynucleotide (S ODN) for the NF-kappaB subunit p50, or they were transfected with a mutated IkappaBalpha gene (MAD-3 mutant) or a control vector, pcDNA-3. AGS cells were treated with COX-2 inhibitors such as indomethacine and NS-398 or prostaglandin E2. mRNA expression for COX-2, and protein levels for p50, IkappaBalpha, and COX-2 were determined by reverse transcription polymerase chain reaction and Western blot analysis. The NF-kappaB levels were examined by electrophoretic mobility shift assay. Thromboxane B2 (TXB2) and 6-keto-prostaglandin F1alpha (6-keto-PGF1alpha) levels were determined by enzyme-linked immunosorbent assay. Cell proliferation was assessed by viable cell counting, [3H] thymidine incorporation, and colony formation. The nuclear level of p50 decreased in AGS cells treated with AS ODN. The IkappaBa mutant was observed in cells transfected with the mutated IkappaBa gene. NF-kappaB was inhibited in cells treated with AS ODN or transfected with the mutated IkappaBalpha gene, compared with the cells treated with S ODN or transfected with control vector. Cell proliferation, mRNA expression and protein level of COX-2, and production of TXB2 and 6-keto-PGF1alpha were inhibited in cells treated with AS ODN or transfected with the mutated IkappaBalpha gene, which had lower NF-kappaB levels than cells treated with S ODN or transfected with control vector. COX-2 inhibitors suppressed cell proliferation and production of TXB2 and 6-keto-PGF1alpha, in a dose-dependant manner. Prostaglandin E2 prevented the inhibition of proliferation in cells treated with AS ODN or transfected with the mutated IkappaBalpha gene. In conclusion, NF-kappaB mediates COX-2 expression, which may be related to cell proliferation, in human gastric cancer cells.
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Affiliation(s)
- J W Lim
- Department of Pharmacology and Institute of Gastroenterology, Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul
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Abstract
Reactive oxygen species (ROS), generated by infiltrating neutrophils, are considered as an important regulator in the pathogenesis and development of pancreatitis. A hallmark of the inflammatory response is the induction of cytokine gene expression, which may be regulated by oxidant-sensitive transcription factor, nuclear factor-kappaB (NF-kappaB). Present study aims to investigate whether neutrophils primed by 4beta-phorbol 12beta-myristate 13alpha-acetate (PMA) affect the productions of H(2)O(2) and lipid peroxide (LPO), NF-kappaB activation and cytokine production in pancreatic acinar cells, and whether these alterations were inhibited by N-acetylcysteine (NAC) and superoxide dismutase (SOD). Neutrophils generated ROS by stimulation with PMA, which was inhibited by NAC and SOD. In acinar cells, PMA-primed neutrophils increased the productions of H(2)O(2), LPO, and cytokines both time and dose dependently. PMA-primed neutrophils resulted in the activation of two species of NF-kappaB dimers (a p50/p65 heterodimer and a p50 homodimer) in acinar cells. Both NAC and SOD inhibited neutrophil-induced, oxidant-mediated alterations in acinar cells. In conclusion, ROS, generated by neutrophils, activates NF-kappaB, resulting in upregulation of inflammatory cytokines in acinar cells. Antioxidants such as NAC might be useful antiinflammatory agents by inhibiting oxidant-mediated activation of NF-kappaB and decreasing cytokine production.
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Affiliation(s)
- H Kim
- Department of Pharmacology and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
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Lim JW, Ko YT, Lee DH, Park SJ, Oh JH, Yoon Y, Chang SG. Treatment of prostatic abscess: value of transrectal ultrasonographically guided needle aspiration. J Ultrasound Med 2000; 19:609-617. [PMID: 10972557 DOI: 10.7863/jum.2000.19.9.609] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The purpose of this study was to assess the effectiveness of transrectal ultrasonographically guided needle aspiration in the treatment of prostatic abscess. Fourteen patients with prostatic abscess were evaluated with this technique and treated with sonographically guided needle aspiration. Using this technique, all cases (100%) had one or more hypoechoic areas within the prostate that contained inhomogeneous materials; in 10 patients (71.0%), the lesion showed internal septa or solid portion. The margins of the hypoechoic area were well defined and thick in 11 patients (79.0%) and poorly defined in 3 patients (21.0%). The estimated volume of the prostatic abscess ranged between 2 and 28 ml (mean, 12.0 ml). The presence of a pus collection within the prostate was confirmed by transrectal ultrasonographically guided aspiration in all patients. However, successful treatment of prostatic abscess with transrectal needle aspiration was done in 12 (86.0%) of 14 patients; the treatment failed in 2 (14.0%) of 14 patients. One patient was treated with perineal incision and drainage and the other with transurethral resection. The amount of pus drained ranged between 1 and 39 ml (mean, 12.0 ml). On follow-up transrectal ultrasonographic examination, no remaining abscess pocket was found within the prostate in any of the cases. One year later, the prostatic abscess recurred in one case. In conclusion, transrectal ultrasonographic guidance is useful in the diagnosis of prostatic abscess as well as in the guidance for aspiration and the drainage of such abscesses. Transrectal ultrasonographically guided needle aspiration could be an effective method for treating prostatic abscess.
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Affiliation(s)
- J W Lim
- Department of Diagnostic Radiology, Kyung Hee Medical Center, Kyung Hee University, School of Medicine, Seoul, Korea
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Abstract
Percutaneous dilational tracheostomy (PDT) has gained popularity among critical care specialists in the past 10 years. The initial studies in our specialty resulted in essentially banning the procedure as a dangerous substitute for standard operative tracheostomy. Despite this action, more than 1,100 cases of percutaneous tracheostomy have been reported with details on complications. We reviewed all published data and studied 311 patients of our own. A prospective study was performed in 3 groups of patients: 1) 50 patients scheduled for PDT performed in the operating room by a head and neck surgeon (group 1); 2) 50 patients who underwent standard operative tracheostomy performed by the same surgeon (group 2); and 3) 211 patients who underwent bedside PDT by critical care physicians (group 3). The intraoperative complication rates were 0% in group 1, 2% in group 2, and 4% in group 3; the postoperative complication rates were 13%, 4%, and 12%, respectively. There were 2 deaths in group 3, and none in groups 1 or 2. The statistically significant differences among the groups were the superiority of group I over group 3 in intraoperative complications, as well as the lower postoperative complication rate of the standard tracheostomy group. These results show that PDT can be performed with acceptable morbidity rates in relation to published complication rates of standard tracheostomy, but it has no advantage over standard tracheostomy with respect to postoperative morbidity. When they are performed by a head and neck surgeon, the morbidity associated with both standard and percutaneous tracheostomies can be reduced.
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Affiliation(s)
- J W Lim
- Department of Otolaryngology and Bronchoesophagology, Rush Medical College, Rush-Prebyterian-St Luke's Medical Center, Chicago, Illinois, USA
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50
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Seo TS, Oh JH, Yoon Y, Lim JW, Park SJ, Chang SG, Jeon YH. Acetic acid as a sclerosing agent for renal cysts: comparison with ethanol in follow-up results. Cardiovasc Intervent Radiol 2000; 23:177-81. [PMID: 10821890 DOI: 10.1007/s002700010039] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE To compare follow-up results of sclerotherapy for renal cyst using 50% acetic acid with those using 99% ethanol as sclerosing agents. METHODS Eighty-one patients underwent sclerotherapy and 58 patients, 23 males, 35 females, aged 6-76 years, having a total of 60 cysts, were included in this study; the others were lost to follow-up. The renal cysts were diagnosed by sonography, computed tomography (CT), or magnetic resonance imaging (MRI). Sclerotherapy was performed using 50% acetic acid for 32 cysts in 31 patients and 99% ethanol for 28 cysts in 27 patients. Under fluoroscopic guidance, cystic fluid was aspirated as completely as possible. After instillation of a sclerosing agent corresponding to 11.7%-25% (4-100 ml) of the aspirated volume, the patient changed position for 20 min and then the agent was removed. Patients were followed up by sonography for a period of 1-49 months. The volume of the renal cyst after sclerotherapy was compared with that of the renal cyst calculated before sclerotherapy. Medical records were reviewed to analyze complications. RESULTS The mean volume after sclerotherapy of the 17 cysts followed for 3-4 months in the acetic acid group was 5.1% of the initial volume, and for the 14 cysts in the ethanol group it was 10.2%. Complete regression during follow-up was shown in 21 cysts (66%) in the acetic acid group; the mean volume of these cysts before the procedure was 245 ml. The mean volume of the nine (32%) completely regressed cysts in the ethanol group was 184 ml. Mild flank pain, which occurred in three patients in each group, was the only complication and resolved the next day. CONCLUSION Acetic acid was an effective and safe sclerosing agent for renal cysts, tending to induce faster and more complete regression than ethanol.
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Affiliation(s)
- T S Seo
- Department of Diagnostic Radiology, Kyung Hee University Hospital, Hoeki-dong 1, Dongdaemun-ku, Seoul 130-702, South Korea
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