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Kim HY, Ashim J, Park S, Kim W, Ji S, Lee SW, Jung YR, Jeong SW, Lee SG, Kim HC, Lee YJ, Kwon MK, Hwang JS, Shin JM, Lee SJ, Yu W, Park JK, Choi SK. A preliminary study about the potential risks of the UV-weathered microplastic: The proteome-level changes in the brain in response to polystyrene derived weathered microplastics. Environ Res 2023; 233:116411. [PMID: 37354929 DOI: 10.1016/j.envres.2023.116411] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/08/2023] [Accepted: 06/11/2023] [Indexed: 06/26/2023]
Abstract
The growing use of plastic materials has resulted in a constant increase in the risk associated with microplastics (MPs). Ultra-violet (UV) light and wind break down modify MPs in the environment into smaller particles known as weathered MPs (WMPs) and these processes increase the risk of MP toxicity. The neurotoxicity of weathered polystyrene-MPs remains unclear. Therefore, it is important to understand the risks posed by WMPs. We evaluated the chemical changes of WMPs generated under laboratory-synchronized environmentally mimetic conditions and compared them with virgin MPs (VMPs). We found that WMP had a rough surface, slight yellow color, reduced molecular weight, and structural alteration compared with those of VMP. Next, 2 μg of ∼100 μm in size of WMP and VMP were orally administered once a day for one week to C57BL/6 male mice. Proteomic analysis revealed that the WMP group had significantly increased activation of immune and neurodegeneration-related pathways compared with that of the VMP group. Consistently, in in vitro experiments, the human brain-derived microglial cell line (HMC-3) also exhibited a more severe inflammatory response to WMP than to VMP. These results show that WMP is a more profound inflammatory factor than VMP. In summary, our findings demonstrate the toxicity of WMPs and provide theoretical insights into their potential risks to biological systems and even humans in the ecosystem.
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Affiliation(s)
- Hee-Yeon Kim
- Core Protein Resources Center, DGIST, Daegu, Republic of Korea; College of Veterinary Medicine, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Janbolat Ashim
- Department of Brain Sciences, DGIST, Daegu, Republic of Korea
| | - Song Park
- Core Protein Resources Center, DGIST, Daegu, Republic of Korea; Department of Brain Sciences, DGIST, Daegu, Republic of Korea
| | - Wansoo Kim
- School of Life Science, BK21 FOUR KNU Creative Bioresearch Group, Kyungpook National University, Daegu, Republic of Korea; Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Sangho Ji
- Department of Brain Sciences, DGIST, Daegu, Republic of Korea
| | - Seoung-Woo Lee
- Core Protein Resources Center, DGIST, Daegu, Republic of Korea; Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Yi-Rang Jung
- Department of Companion Animal Health Management, Daegu Health College, Daegu, Republic of Korea
| | - Sang Won Jeong
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Se-Guen Lee
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Hyun-Chul Kim
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Young-Jae Lee
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Mi Kyung Kwon
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | | | - Jung Min Shin
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Sung-Jun Lee
- Division of Biotechnology, DGIST, Daegu, Republic of Korea.
| | - Wookyung Yu
- Core Protein Resources Center, DGIST, Daegu, Republic of Korea; Department of Brain Sciences, DGIST, Daegu, Republic of Korea.
| | - Jin-Kyu Park
- College of Veterinary Medicine, Kyungpook National University, Daegu, 41566, Republic of Korea.
| | - Seong-Kyoon Choi
- Core Protein Resources Center, DGIST, Daegu, Republic of Korea; Division of Biotechnology, DGIST, Daegu, Republic of Korea.
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Lee ES, Ko H, Kim CH, Kim HC, Choi SK, Jeong SW, Lee SG, Lee SJ, Na HK, Park JH, Shin JM. Disease-microenvironment modulation by bare- or engineered-exosome for rheumatoid arthritis treatment. Biomater Res 2023; 27:81. [PMID: 37635253 PMCID: PMC10464174 DOI: 10.1186/s40824-023-00418-2] [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: 05/22/2023] [Accepted: 08/13/2023] [Indexed: 08/29/2023] Open
Abstract
BACKGROUND Exosomes are extracellular vesicles secreted by eukaryotic cells and have been extensively studied for their surface markers and internal cargo with unique functions. A deeper understanding of exosomes has allowed their application in various research areas, particularly in diagnostics and therapy. MAIN BODY Exosomes have great potential as biomarkers and delivery vehicles for encapsulating therapeutic cargo. However, the limitations of bare exosomes, such as rapid phagocytic clearance and non-specific biodistribution after injection, pose significant challenges to their application as drug delivery systems. This review focuses on exosome-based drug delivery for treating rheumatoid arthritis, emphasizing pre/post-engineering approaches to overcome these challenges. CONCLUSION This review will serve as an essential resource for future studies to develop novel exosome-based therapeutic approaches for rheumatoid arthritis. Overall, the review highlights the potential of exosomes as a promising therapeutic approach for rheumatoid arthritis treatment.
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Affiliation(s)
- Eun Sook Lee
- Safety Measurement Institute, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-Ro, Yuseong-Gu, Daejeon, 34113, Republic of Korea
| | - Hyewon Ko
- Bionanotechnology Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Yuseong-Gu, Daejeon, 34141, Republic of Korea
| | - Chan Ho Kim
- School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Hyun-Chul Kim
- Division of Biotechnology, Convergence Research Institute, DGIST, 333 Techno Jungang-Daero, Daegu, 42988, Republic of Korea
| | - Seong-Kyoon Choi
- Division of Biotechnology, Convergence Research Institute, DGIST, 333 Techno Jungang-Daero, Daegu, 42988, Republic of Korea
| | - Sang Won Jeong
- Division of Biotechnology, Convergence Research Institute, DGIST, 333 Techno Jungang-Daero, Daegu, 42988, Republic of Korea
| | - Se-Guen Lee
- Division of Biotechnology, Convergence Research Institute, DGIST, 333 Techno Jungang-Daero, Daegu, 42988, Republic of Korea
| | - Sung-Jun Lee
- Division of Biotechnology, Convergence Research Institute, DGIST, 333 Techno Jungang-Daero, Daegu, 42988, Republic of Korea
| | - Hee-Kyung Na
- Safety Measurement Institute, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-Ro, Yuseong-Gu, Daejeon, 34113, Republic of Korea
| | - Jae Hyung Park
- School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Jung Min Shin
- Division of Biotechnology, Convergence Research Institute, DGIST, 333 Techno Jungang-Daero, Daegu, 42988, Republic of Korea.
- Department of Polymer Science and Engineering, Korea National University of Transportation, Chungju, 27469, Republic of Korea.
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Kwon W, Kim D, Kim HY, Jeong SW, Lee SG, Kim HC, Lee YJ, Kwon MK, Hwang JS, Han JE, Park JK, Lee SJ, Choi SK. Microglial phagocytosis of polystyrene microplastics results in immune alteration and apoptosis in vitro and in vivo. Sci Total Environ 2022; 807:150817. [PMID: 34627918 DOI: 10.1016/j.scitotenv.2021.150817] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/18/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
The remarkable increase in plastic usage and widespread microplastic (MP) pollution has emerged as a substantial concern today. Many recent studies have revealed MPs as potentially hazardous substances in mammals. Despite several reports on the impact of small MPs in the brain and behaviors in aquatic animals, it is still unclear how small MPs affect the brain and its underlying cellular physiology in terrestrial animals. In this study, we investigated the accumulation of polystyrene MPs (PS-MPs) in mouse brain after oral treatment using three types of fluorescent PS-MPs of different sizes (0.2,2 and 10 μm). We found that PS-MPs were deposited in microglial cells of the brain. Following differential treatment of PS-MPs in human microglial HMC-3 cells, we identified changes in cellular morphology, immune responses, and microglial apoptosis induced by phagocytosis of 0.2 and 2 μm PS-MPs. By analyzing the PS-MP-treated HMC-3 cell transcriptome, we showed that PS-MPs treatment altered the expression of clusters of immune response genes, immunoglobulins, and several related microRNAs. In addition, we confirmed alterations in microglial differentiation marker expression with the activation of NF-κB, pro-inflammatory cytokines and apoptotic markers in PS-MP-treated human microglial cells and in mouse brain. Our findings suggest a potential risk of small PS-MPs in microglial immune activation, which leads to microglial apoptosis in murine and human brains.
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Affiliation(s)
- Wookbong Kwon
- Division of Biotechnology, DGIST, Daegu, Republic of Korea; Core Protein Resources Center, DGIST, Daegu, Republic of Korea
| | - Daehwan Kim
- Division of Biotechnology, DGIST, Daegu, Republic of Korea; Core Protein Resources Center, DGIST, Daegu, Republic of Korea
| | - Hee-Yeon Kim
- Core Protein Resources Center, DGIST, Daegu, Republic of Korea; College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sang Won Jeong
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Se-Guen Lee
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Hyun-Chul Kim
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Young-Jae Lee
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | - Mi Kyung Kwon
- Division of Biotechnology, DGIST, Daegu, Republic of Korea
| | | | - Jee Eun Han
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Jin-Kyu Park
- College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sung-Jun Lee
- Division of Biotechnology, DGIST, Daegu, Republic of Korea.
| | - Seong-Kyoon Choi
- Division of Biotechnology, DGIST, Daegu, Republic of Korea; Core Protein Resources Center, DGIST, Daegu, Republic of Korea.
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Nation HL, Jeong SY, Jeong SW, Occhialini AP. Anomalous muscles and nerves in the hand of a 94-year-old cadaver-A case report. Int J Surg Case Rep 2019; 65:119-123. [PMID: 31704662 PMCID: PMC6920165 DOI: 10.1016/j.ijscr.2019.10.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/23/2019] [Accepted: 10/24/2019] [Indexed: 11/18/2022] Open
Abstract
The additional flexor muscle (Flexor Digiti Minimi Longus m.) passing through Guyon’s canal is the first to be described. The anomalous first lumbrical muscle with three origins is the first to be described. Berretini’s and Kaplan’s anastomosis was also noted.
Introduction During an anatomical dissection of the distal upper extremities, numerous muscular and nervous anomalies were found in the forearm and hand of a 94-year-old cadaver. These anomalies are clinically relevant with regard to medical or surgical interventions. Presentation of case The presence of a “flexor digiti minimi longus” muscle was observed passing through Guyon’s canal; to our knowledge this passageway has never been previously reported. An aberrant first lumbrical with three origins was noted. Additionally, numerous atypical nerves were found innervating the hand; the dorsal branch of the ulnar nerve contributed to cutaneous innervation of the palm of the hand (Kaplan’s anastomosis), the superficial ulnar nerve provided muscular innervation to the flexor digiti minimi brevis muscle, and two connections between the common palmar digital branches of the median and superficial ulnar nerves were observed (Berrettini anastomosis). Discussion Here, we describe an extranumerary muscle associated with the hypothenar group of muscles. We also describe unusual origins of the first lumbrical muscle, and atypical cutaneous and muscular innervation to the palm of the hand. Conclusion Clinically, understanding the existence of these anatomical variations may influence medical care or surgical procedures.
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Affiliation(s)
- H L Nation
- Department of Cell Systems and Anatomy, University of Texas-Health at San Antonio, 7703 Floyd Curl Dr, San Antonio, TX 78229, United States.
| | - S Y Jeong
- Long School of Medicine, University of Texas-Health at San Antonio, 7703 Floyd Curl Dr, San Antonio, TX 78229, United States.
| | - S W Jeong
- Long School of Medicine, University of Texas-Health at San Antonio, 7703 Floyd Curl Dr, San Antonio, TX 78229, United States.
| | - A P Occhialini
- Department of Cell Systems and Anatomy, University of Texas-Health at San Antonio, 7703 Floyd Curl Dr, San Antonio, TX 78229, United States.
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Choi YI, Choi ES, Mun KH, Lee SG, Lee SJ, Jeong SW, Lee SW, Kim HC. Dual-responsive Gemini Micelles for Efficient Delivery of Anticancer Therapeutics. Polymers (Basel) 2019; 11:E604. [PMID: 30960588 PMCID: PMC6523983 DOI: 10.3390/polym11040604] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 03/29/2019] [Accepted: 03/29/2019] [Indexed: 12/30/2022] Open
Abstract
Polymeric micelles as drug delivery vehicles are popular owing to several advantages. In this study, a gemini amphiphile (gemini mPEG-Cys-PMT) consisting of hydrophilic poly(ethylene glycol) and hydrophobic poly(methionine) with cystine disulfide spacer was synthesized and its micellar properties for thiol- or reactive oxygen species (ROS)-dependent intracellular drug delivery were described. The cleavage of cystine linkage in a redox environment or the oxidation of methionine units in a ROS environment caused the destabilization of micelles. Such redox- or ROS-triggered micellar destabilization led to enhanced release of encapsulated doxorubicin (DOX) to induce cytotoxicity against cancer cells. Further, the therapeutic effects of the DOX-loaded micelles were demonstrated using the KB cell line. This study shows that thiol and ROS dual-responsive gemini micelles are promising platforms for nano-drug delivery in various cancer therapies.
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Affiliation(s)
- Young In Choi
- Convergence Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
| | - Eun-Sook Choi
- Convergence Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
| | - Kwan Ho Mun
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Korea.
| | - Se Guen Lee
- Convergence Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
| | - Sung Jun Lee
- Convergence Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
| | - Sang Won Jeong
- Convergence Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
| | - Seung Woo Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Korea.
| | - Hyun-Chul Kim
- Convergence Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
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Park SI, Chung SH, Kim HC, Lee SG, Lee SJ, Kim H, Kim H, Jeong SW. Prolonged heating of Fe3O4–Au hybrid nanoparticles in a radiofrequency solenoid coil. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.11.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Kim HC, Kim E, Ha TL, Lee SG, Lee SJ, Jeong SW. Highly stable and reduction responsive micelles from a novel polymeric surfactant with a repeating disulfide-based gemini structure for efficient drug delivery. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.11.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Lee YJ, Kwon MK, Lee SJ, Jeong SW, Kim HC, Oh TH, Lee SG. Influence of water on phase transition and rheological behavior of cellulose/ionic liquid/water ternary systems. J Appl Polym Sci 2016. [DOI: 10.1002/app.44658] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Young Jae Lee
- Division of Nano and Energy Convergence Research; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 42988 Republic of Korea
| | - Mi Kyung Kwon
- Division of Nano and Energy Convergence Research; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 42988 Republic of Korea
| | - Sung Jun Lee
- Division of Nano and Energy Convergence Research; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 42988 Republic of Korea
| | - Sang Won Jeong
- Division of Nano and Energy Convergence Research; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 42988 Republic of Korea
| | - Hyun-Chul Kim
- Division of Nano and Energy Convergence Research; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 42988 Republic of Korea
| | - Tae Hwan Oh
- Department of Nano Medical and Polymer Materials; Yeungnam University; Gyeongsan 38541 Republic of Korea
| | - Se Geun Lee
- Division of Nano and Energy Convergence Research; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 42988 Republic of Korea
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Im SB, Kwon SJ, Ryu J, Jeong SW, Kim JB, Ahn JW, Kim SH, Jo YD, Choi HI, Kang SY. Development of a transposon-based marker system for mutation breeding in sorghum (Sorghum bicolor L.). Genet Mol Res 2016; 15:gmr8713. [PMID: 27706735 DOI: 10.4238/gmr.15038713] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Under certain circumstances, transposable elements (TE) can create or reverse mutations and alter the genome size of a cell. Sorghum (Sorghum bicolor L.) is promising for plant transposon tagging due to its small genome size and its low content of repetitive DNA. We developed a marker system based on targeted region amplification polymorphisms (TE-TRAP) that uses the terminal inverted repeats (TIRs) of transposons. A total of 3816 class 2 transposons belonging to the PIF/Harbinger family were identified from the whole sorghum genome that produced five primers, including eight types of TIRs. To define the applicability and utilization of TE-TRAP, we used 21 individuals that had been bred after ɤ-ray irradiation. In total, 31 TE-TRAP, 16 TD, and 21 AFLP primer combinations generated 1133, 223, and 555 amplicons, respectively. The percent polymorphic marker was 62.8, 51.1, and 59.3% for the TE-TRAP, TD, and AFLP markers, respectively. Phylogenetic and principal component analyses revealed that TE-TRAP divided the 21 individuals into three groups. Analysis of molecular variance suggested that TE-TRAP had a higher level of genetic diversity than the other two marker systems. After verifying the efficiency of TE-TRAP, 189 sorghum individuals were used to investigate the associations between the markers and the ɤ-ray doses. Two significant associations were found among the polymorphic markers. This TE-based method provides a useful marker resource for mutation breeding research.
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Affiliation(s)
- S B Im
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - S-J Kwon
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea .,Radiation Biotechnology and Applied Radioisotope Science, University of Science and Technology, Daejeon, Korea
| | - J Ryu
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - S W Jeong
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - J B Kim
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - J-W Ahn
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea.,Radiation Biotechnology and Applied Radioisotope Science, University of Science and Technology, Daejeon, Korea
| | - S H Kim
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - Y D Jo
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - H-I Choi
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
| | - S-Y Kang
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Korea
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Ryu J, Im SB, Kwon SJ, Ahn JW, Jeong SW, Kang SY. Chemical and genetic diversity of high-seed-yield sorghum (Sorghum bicolor M.) germplasms. Genet Mol Res 2016; 15:gmr8677. [PMID: 27706704 DOI: 10.4238/gmr.15038677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study evaluated the chemical and genetic diversity of high-seed-yield sorghum germplasms from Korea, the United States, and South Africa. We identified significant differences in the chemical contents of whole plants at the heading stage in all cultivars, including differences in crude protein, fat, fiber, ash, neutral detergent fiber, acid detergent fiber, mineral, and fatty acid contents. Our results suggest that Banwoldang is the most appropriate cultivar for roughage because of its high protein yield. We identified significant differences in the tannin, flavonoid, amylose, mineral, crude fat, fatty acid, and 3-deoxyanthocyanin contents in the whole grain from all cultivars, but not in the mineral or crude fat contents. Tannin levels were generally low. IS645 contained the highest levels of flavonoids and linolenic acid compounds, and Moktak had the highest amylose and deoxyanthocyanidin content in the grain. To assess genetic diversity, we used 10 simple sequence repeat (SSR) primer sets to identify 38 alleles with 3-8 alleles per locus. Based on phylogenetic analysis of the SSR markers, the sorghum cultivars were divided into three major groups. Comparison of clusters based on chemical compositions with those based on SSRs showed that the groups formed by the three native Korean cultivars clustered similarly in molecular dendrograms. Association analysis was conducted for the 10 SSR marker; 48 chemical and growth traits were present for two marker traits (seed color and whole plant fatty acid content) with significant marker-trait associations. These markers could be used to select sorghum cultivars for breeding programs.
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Affiliation(s)
- J Ryu
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongup, Korea
| | - S B Im
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongup, Korea
| | - S J Kwon
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongup, Korea.,Unversity of Science and Technology, Radiation Biotechnology and Applied Radioisotope Science, Daejeon, Korea
| | - J W Ahn
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongup, Korea.,Unversity of Science and Technology, Radiation Biotechnology and Applied Radioisotope Science, Daejeon, Korea
| | - S W Jeong
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongup, Korea
| | - S Y Kang
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongup, Korea
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Kim HC, Jin KS, Lee SG, Kim E, Lee SJ, Jeong SW, Lee SW, Kim KW. Synchrotron Small-Angle X-ray Scattering Study of Cross-Linked Polymeric Micelles. J Nanosci Nanotechnol 2016; 16:6432-6439. [PMID: 27427731 DOI: 10.1166/jnn.2016.12108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polymeric micelles of methoxypoly(ethylene glycol)-b-poly(lactide) containing lysine units (mPEG-PLA-Lys4) were cross-linked by reacting of lysine moieties with a bifunctional bis(N-hydroxy-succinimide ester). The micelles were characterized in aqueous solution using dynamic light scattering, transmission electron microscopy, and synchrotron small-angle X-ray scattering. The mPEG-PLA-Lys4 was synthesized through the ring-opening polymerization of N6-carbobenzyloxy-L-lysine N-carboxyanhydride with amine-terminated mPEG-PLA and subsequent deprotection. The polymeric micelles showed enhanced micelle stability after cross-linking, which was confirmed by adding sodium dodecyl sulfate as a destabilizing agent. The average diameters measured via dynamic light scattering were 19.1 nm and 29.2 nm for non-cross-linked polymeric micelles (NCPMs) and cross-linked polymeric micelles (CPMs), respectively. The transmission electron microscopy images showed that the size of the polymeric micelles increased slightly due to cross-linking, which was in good agreement with the DLS measurements. The overall structures and internal structural changes of NCPMs and CPMs in aqueous solution were studied in detail using synchrotron X-ray scattering method. According to the structural parameters of X-ray scattering analysis, CPMs with a more densely packed core structure were formed by reacting bifunctional cross-linking agents with lysine amino groups located in the innermost core of the polymeric micelles.
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Lee JS, Lee SM, Jeong SW, Sung YG, Lee JH, Kim KW. Effects of age, replicative lifespan and growth rate of human nucleus pulposus cells on selecting age range for cell-based biological therapies for degenerative disc diseases. Biotech Histochem 2016; 91:377-85. [PMID: 27149303 DOI: 10.1080/10520295.2016.1179790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Autologous disc cell implantation, growth factors and gene therapy appear to be promising therapies for disc regeneration. Unfortunately, the replicative lifespan and growth kinetics of human nucleus pulposus (NP) cells related to host age are unclear. We investigated the potential relations among age, replicative lifespan and growth rate of NP cells, and determined the age range that is suitable for cell-based biological therapies for degenerative disc diseases. We used NP tissues classified by decade into five age groups: 30s, 40s, 50s, 60s and 70s. The mean cumulative population doubling level (PDL) and population doubling rate (PDR) of NP cells were assessed by decade. We also investigated correlations between cumulative PDL and age, and between PDR and age. The mean cumulative PDL and PDR decreased significantly in patients in their 60s. The mean cumulative PDL and PDR in the younger groups (30s, 40s and 50s) were significantly higher than those in the older groups (60s and 70s). There also were significant negative correlations between cumulative PDL and age, and between PDR and age. We found that the replicative lifespan and growth rate of human NP cells decreased with age. The replicative potential of NP cells decreased significantly in patients 60 years old and older. Young individuals less than 60 years old may be suitable candidates for NP cell-based biological therapies for treating degenerative disc diseases.
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Affiliation(s)
- J S Lee
- a Departments of Orthopedic Surgery , Seoul , Korea
| | - S M Lee
- a Departments of Orthopedic Surgery , Seoul , Korea
| | - S W Jeong
- b Orthopedic Research, Medical Research Institute , Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul , Korea
| | - Y G Sung
- a Departments of Orthopedic Surgery , Seoul , Korea
| | - J H Lee
- a Departments of Orthopedic Surgery , Seoul , Korea
| | - K W Kim
- a Departments of Orthopedic Surgery , Seoul , Korea
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Lee GH, Lee SJ, Jeong SW, Kim HC, Park GY, Lee SG, Choi JH. Antioxidative and antiinflammatory activities of quercetin-loaded silica nanoparticles. Colloids Surf B Biointerfaces 2016; 143:511-517. [PMID: 27038916 DOI: 10.1016/j.colsurfb.2016.03.060] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 03/19/2016] [Accepted: 03/21/2016] [Indexed: 10/22/2022]
Abstract
Utilizing the biological activities of compounds by encapsulating natural components in stable nanoparticles is an important strategy for a variety of biomedical and healthcare applications. In this study, quercetin-loaded silica nanoparticles were synthesized using an oil-in-water microemulsion method, which is a suitable system for producing functional nanoparticles of controlled size and shape. The resulting quercetin-loaded silica nanoparticles were spherical, highly monodispersed, and stable in an aqueous system. Superoxide radical scavenging effects were found for the quercetin-loaded silica nanoparticles as well as free quercetin. The quercetin-loaded silica nanoparticles showed cell viability comparable to that of the controls. The amounts of proinflammatory cytokines produced by macrophages, such as interleukin 1 beta, interleukin 6, and tumor necrosis factor alpha, were reduced significantly for the quercetin-loaded silica nanoparticles. These results suggest that the antioxidative and antiinflammatory activities of quercetin are maintained after encapsulation in silica. Silica nanoparticles can be used for the effective and stable incorporation of biologically active natural components into composite biomaterials.
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Affiliation(s)
- Ga Hyun Lee
- Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea; Department of Advanced Organic Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sung June Lee
- Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
| | - Sang Won Jeong
- Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
| | - Hyun-Chul Kim
- Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
| | - Ga Young Park
- Department of Bio-fibers and materials Science, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Se Geun Lee
- Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea.
| | - Jin Hyun Choi
- Department of Advanced Organic Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea; Department of Bio-fibers and materials Science, Kyungpook National University, Daegu 41566, Republic of Korea.
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Kim HC, Kim E, Lee SG, Lee SJ, Jeong SW, Hal TL, Lee B, Lee SW. Folic Acid-Functionalized Polythiophene for Targeted Cellular Imaging. J Nanosci Nanotechnol 2016; 16:189-195. [PMID: 27398444 DOI: 10.1166/jnn.2016.10683] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polythiophene containing pendant N-hydroxysuccinimide (NHS) ester groups was reacted with poly(ethylene glycol) (PEG) and oleylamine, which was subsequently modified with folic acid to prepare a targeting fluorescent cellular imaging probe. The amphiphilic character of the folic acid-functionalized polythiophene induced the formation of nanoparticles with an average diameter of 95.3 nm in water. This polymer shows good photostability and low toxicity toward KB cells at a high concentration (100 µg/mL), which meets the crucial requirement for cellular imaging and other biological applications. The folic acid-functionalized polythiophene could be internalized efficiently into KB cells and accumulated in the cytoplasm to yield bright fluorescence, indicating that it is a good candidate material for the fluorescence imaging of living cells.
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Kim HC, Kim E, Jeong SW, Ha TL, Park SI, Lee SG, Lee SJ, Lee SW. Magnetic nanoparticle-conjugated polymeric micelles for combined hyperthermia and chemotherapy. Nanoscale 2015; 7:16470-16480. [PMID: 26395038 DOI: 10.1039/c5nr04130a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Magnetic nanoparticle-conjugated polymeric micelles (MNP-PMs) consisting of poly(ethylene glycol)-poly(lactide) (PEG-PLA) and iron oxide nanoparticles were prepared and used as nanocarriers for combined hyperthermia and chemotherapy. Doxorubicin (DOX) was encapsulated in MNP-PMs, and an alternating magnetic field (AMF) resulted in an increase to temperature within a suitable range for inducing hyperthermia and a higher rate of drug release than observed without AMF. In vitro cytotoxicity and hyperthermia experiments were carried out using human lung adenocarcinoma A549 cells. When MNP-PMs encapsulated with an anticancer drug were used to treat A549 cells in combination with hyperthermia under AMF, 78% of the cells were killed by the double effects of heat and the drug, and the combination was more effective than either chemotherapy or hyperthermia treatment alone. Therefore, MNP-PMs encapsulated with an anticancer drug show potential for combined chemotherapy and hyperthermia.
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Affiliation(s)
- Hyun-Chul Kim
- Division of Nano and Energy Convergence Research, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Korea.
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Kim HC, Kim E, Ha TL, Jeong SW, Lee SG, Lee SJ, Lee B. Thiol-responsive gemini poly(ethylene glycol)-poly(lactide) with a cystine disulfide spacer as an intracellular drug delivery nanocarrier. Colloids Surf B Biointerfaces 2015; 127:206-12. [PMID: 25679493 DOI: 10.1016/j.colsurfb.2015.01.039] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 12/30/2014] [Accepted: 01/23/2015] [Indexed: 12/20/2022]
Abstract
Thiol-responsive gemini micelles consisting of hydrophilic poly(ethylene glycol) (PEG) blocks and hydrophobic polylactide (PLA) blocks with a cystine disulfide spacer were reported as effective intracellular nanocarriers of drugs. In the presence of cellular glutathione (GSH) as a reducing agent, gemini micelles gradually destabilize into monomeric micelles through cleavage of the cystine linkage. This destabilization of the gemini micelles changed their size distribution, with the appearance of small aggregates, and led to the enhanced release of encapsulated doxorubicin (DOX). The results obtained from cell culture via confocal laser scanning microscopy (CLSM) for cellular uptake, as well as cell viability measurements for anticancer efficacy suggest the potential of disulfide-based gemini polymeric micelles as controlled drug delivery carriers.
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Affiliation(s)
- Hyun-Chul Kim
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea.
| | - Eunjoo Kim
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea.
| | - Tae-Lin Ha
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea
| | - Sang Won Jeong
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea
| | - Se Guen Lee
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea
| | - Sung Jun Lee
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea
| | - Boram Lee
- Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea
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Abstract
In this work, we report a qualitative approach for detecting the adsorption of C-reactive protein on phosphocholine-terminated self-assembled monolayers without the use of any labels.
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Affiliation(s)
- Hyunmin Kim
- Division of Nano and Energy Convergence Research
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
| | - Eunjoo Kim
- Division of Nano and Energy Convergence Research
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
| | - Eunsook Choi
- Division of Nano and Energy Convergence Research
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
| | - Chul Su Baek
- Division of Nano and Energy Convergence Research
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
| | - Bokyung Song
- Department of Emerging Materials Science
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
| | - Chang-Hee Cho
- Department of Emerging Materials Science
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
| | - Sang Won Jeong
- Division of Nano and Energy Convergence Research
- Daegu Gyeongbuk Institute of Science and Technology
- Daegu 711-873
- Republic of Korea
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Jang JY, Kim TY, Sohn JH, Lee TH, Jeong SW, Park EJ, Lee SH, Kim SG, Kim YS, Kim HS, Kim BS. Relative adrenal insufficiency in chronic liver disease: its prevalence and effects on long-term mortality. Aliment Pharmacol Ther 2014; 40:819-26. [PMID: 25078874 DOI: 10.1111/apt.12891] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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] [Received: 04/07/2014] [Revised: 04/29/2014] [Accepted: 07/07/2014] [Indexed: 12/12/2022]
Abstract
BACKGROUND The relationship between relative adrenal insufficiency (RAI) and chronic liver disease is unclear. AIM To determine the frequency with which RAI is observed in noncritically ill patients at various stages of chronic liver disease, and the correlation between RAI and disease severity and long-term mortality. METHODS In total, 71 non-critically ill patients with liver cirrhosis (n = 54) and chronic hepatitis (n = 17) were evaluated prospectively. A short stimulation test (SST) with 250 μg of corticotrophin was performed to detect RAI. RAI was defined as an increase in serum cortisol of <9 μg/dL in patients with a basal total cortisol of <35 μg/dL. RESULTS RAI was observed in only 13 (24.1%) of 54 patients with cirrhosis. Compared to those without RAI, cirrhotic patients with RAI had significantly higher Child-Turcotte-Pugh score (10.3 ± 1.7 vs. 7.1 ± 1.8, mean ± s.d., P < 0.001) and Model for End-Stage Liver Disease score (14.5 ± 6.6 vs. 9.4 ± 3.7, P = 0.017). The cortisol response to corticotropin was negatively correlated with the severity of cirrhosis (P < 0.05). In addition, the mortality rate was higher in cirrhotic patients with RAI (69.2%) than in those without RAI (4.9%; P < 0.001) during the follow-up period of 20.1 ± 13.5 months (range, 5.8-51.1 months). The cumulative 1-year survival rates in cirrhotic patients with and without RAI were 69.2% and 95.0%, respectively (P = 0.05), while the corresponding cumulative 3-year survival rates were 0% and 95.0% (P < 0.001). CONCLUSIONS Relative adrenal insufficiency is more commonly observed in those with severe cirrhosis, and is clearly associated with more advanced liver disease and a shortened long-term survival. This suggests that relative adrenal insufficiency is an independent prognostic factor in non-critically ill patients with cirrhosis.
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Affiliation(s)
- J Y Jang
- Division of Gastroenterology, Department of Internal Medicine, Digestive Disease Center, Institute for Digestive Research, College of Medicine, Soonchunhyang University, Seoul, South Korea
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Lee SJ, Lee HS, Jeong SW, Kim HC, Lee SG, Oh TH. Effect of dimethyl sulfoxide on synthesis of thermoplastic cellulose-Graft-poly(l-lactide) copolymer using ionic liquid as reaction media. J Appl Polym Sci 2014. [DOI: 10.1002/app.41331] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Sung Jun Lee
- Nano & Bio Research Division; Daegu Gyeonbuk Institute of Science and Technology (DGIST); Daegu 711-873 South Korea
| | - Hae Sung Lee
- Nano & Bio Research Division; Daegu Gyeonbuk Institute of Science and Technology (DGIST); Daegu 711-873 South Korea
| | - Sang Won Jeong
- Nano & Bio Research Division; Daegu Gyeonbuk Institute of Science and Technology (DGIST); Daegu 711-873 South Korea
| | - Hyun-Chul Kim
- Nano & Bio Research Division; Daegu Gyeonbuk Institute of Science and Technology (DGIST); Daegu 711-873 South Korea
| | - Se Geun Lee
- Nano & Bio Research Division; Daegu Gyeonbuk Institute of Science and Technology (DGIST); Daegu 711-873 South Korea
| | - Tae Hwan Oh
- Department of Nano, Medical and Polymer Materials; Yeungnam University; Gyeongsan 712-749 South Korea
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Kim HC, Kim E, Lee SG, Lee SJ, Kim H, Jeong SW. Thiol-responsive micelles based on nonionic gemini surfactants with a cystine disulfide spacer. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.27036] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hyun-Chul Kim
- Nano and Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 711-873 Korea
| | - Eunjoo Kim
- Nano and Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 711-873 Korea
| | - Se Guen Lee
- Nano and Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 711-873 Korea
| | - Sung Jun Lee
- Nano and Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 711-873 Korea
| | - Hyunmin Kim
- Nano and Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 711-873 Korea
| | - Sang Won Jeong
- Nano and Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology (DGIST); Daegu 711-873 Korea
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21
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Kim E, Lee SG, Kim HC, Lee SJ, Baek CS, Choi ES, Jeong SW. Phosphocholine-Modified Magnetic Nanoparticles for Isolation of C-Reactive Protein from Human Serum. SEP SCI TECHNOL 2013. [DOI: 10.1080/01496395.2013.807516] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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22
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Kim E, Lee SG, Kim HC, Lee SJ, Baek CS, Jeong SW. Protein-Directed Immobilization of Phosphocholine Ligands on a Gold Surface for Multivalent C-Reactive Protein Binding. Curr Top Med Chem 2013; 13:519-24. [DOI: 10.2174/1568026611313040012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 11/23/2012] [Accepted: 11/28/2012] [Indexed: 11/22/2022]
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23
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Kim E, Kim HC, Lee SG, Lee SJ, Go TJ, Baek CS, Jeong SW. C-Reactive protein-directed immobilization of phosphocholine ligands on a solid surface. Chem Commun (Camb) 2011; 47:11900-2. [DOI: 10.1039/c1cc15079k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Lee SK, Kim HC, Cho SJ, Jeong SW, Jeon WB. Binding behavior of CRP and anti-CRP antibody analyzed with SPR and AFM measurement. Ultramicroscopy 2008; 108:1374-8. [DOI: 10.1016/j.ultramic.2008.04.064] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Yoon BW, Bae HJ, Hong KS, Lee SM, Park BJ, Yu KH, Han MK, Lee YS, Chung DK, Park JM, Jeong SW, Lee BC, Cho KH, Kim JS, Lee SH, Yoo KM. Phenylpropanolamine contained in cold remedies and risk of hemorrhagic stroke. Neurology 2007; 68:146-9. [PMID: 17210897 DOI: 10.1212/01.wnl.0000250351.38999.f2] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [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: 11/15/2022] Open
Abstract
In this study, we sought to elucidate whether phenylpropanolamine (PPA) in cold remedies (small and divided doses) increases the risk of hemorrhagic stroke (HS). PPA exposure significantly increased the risk, and the risk was much higher in women. In women, linear trends were also found in recency, duration, and dosage of PPA exposure. PPA contained in cold remedies increases the risk of HS, particularly in women.
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Affiliation(s)
- B W Yoon
- Department of Neurology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, 110-744, Republic of Korea.
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28
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Yamakage M, Iwasaki S, Jeong SW, Ishiyama SI, Namiki A. Comparative study between propofol in a long-chain triglyceride and propofol in a medium/long-chain triglyceride during sedation with target-controlled infusion. Anaesth Intensive Care 2005; 33:351-5. [PMID: 15973918 DOI: 10.1177/0310057x0503300301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study was performed to compare the pharmacological characteristics of propofol in an emulsion of both medium- and long-chain triglycerides (MCT/LCT) with those of propofol in an LCT emulsion, by measuring the sedative level and the plasma concentration of propofol during sedation using a target-controlled infusion (TCI) technique. Forty ASA 1 or 2 adult patients who required spinal anaesthesia for surgery were enrolled in this study. The patients were divided into two groups: a propofol LCT group (n = 20) and a propofol MCT/LCT group (n = 20). Propofol was injected intravenously at target blood concentrations of 2.0, 3.0 and 4.0 microg x ml(-1). The bispectral (BIS) index was recorded, and arterial blood was drawn to measure the actual plasma concentrations of propofol at each predicted concentration. Propofol was assayed by high-performance liquid chromatography. Propofol MCT/LCT was associated with significantly less pain than propofol LCT (P < 0.05). There were no significant differences between the two groups in BIS index or in plasma concentration of propofol at each predicted concentration. Computer-generated TCI of propofol MCT/LCT during sedation is comparable with that of propofol LCT with respect to pharmacokinetics and pharmacodynamics. The formulation of MCT/LCT has a beneficial effect with respect to less pain on injection.
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Affiliation(s)
- M Yamakage
- Department of Anesthesiology, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, Hokkaido 060-8543, Japan
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Park GY, Im YH, Ahn CH, Park JW, Jeong SW, Ahn JY, Hwang YJ. Functional and genetic assessment of IFN-gamma receptor in patients with clinical tuberculosis. Int J Tuberc Lung Dis 2004; 8:1221-7. [PMID: 15527154] [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: 05/01/2023] Open
Abstract
OBJECTIVE The molecular basis of the genetic vulnerability underlying the most common form of clinical tuberculosis (TB) remains largely unknown. We speculated that mild genetic defects in the interferon-gamma (IFN-gamma) signalling pathway caused a subtle functional impairment of IFN-gamma which would explain susceptibility to Mycobacterium tuberculosis in clinical TB. DESIGN A case-control study. RESULTS We evaluated functional responsiveness to IFN-gamma in monocytes from patients with clinical TB (n = 10), and analysed the genetic sequences of the IFN-gamma receptor 1 (IFN-gammaR1) and STAT1 genes in patients with disseminated TB (n = 18). IFN-gamma stimulated an increase in the expression of HLA-DR and CD64 on monocytes of both controls and patients; the rate of increase in expression was the same in both groups. Treatment with IFN-gamma before lipopolysaccharide (LPS) stimulation further increased tumour necrosis factor-alpha (TNF-alpha) production as compared to TNF-alpha production with LPS stimulation alone; the rate of increase in TNF-alpha production was the same in both groups. The known mutations in the coding sequences of the IFN-gammaR1 and STAT1 genes were not found in the patients with disseminated tuberculosis. CONCLUSION These results suggest that impairment of the IFN-gamma signalling pathway did not account for cases of clinical TB in this study.
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Affiliation(s)
- G Y Park
- Department of Internal Medicine, Gachon Medical School, Gil Medical Centre, Incheon, South Korea.
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Affiliation(s)
- Y K Choi
- Korea Research Institute of BioScience and Biotechnology, Daejon 305-333, Republic of Korea
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Chen WR, Jeong SW, Lucroy MD, Wolf RF, Howard EW, Liu H, Nordquist RE. Induced antitumor immunity against DMBA-4 metastatic mammary tumors in rats using laser immunotherapy. Int J Cancer 2003; 107:1053-7. [PMID: 14601069 DOI: 10.1002/ijc.11501] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Induced antitumor immunity is a highly effective and long-term cure for cancer, particularly for metastatic tumors. Laser immunotherapy was developed to induce such an immunologic response. It involves intratumoral administration of a light-absorbing dye and a specially formulated immunoadjuvant, followed by noninvasive irradiation of a near-infrared laser. Treatment of DMBA-4 metastatic mammary tumors in rats with this approach has resulted in local control of primary tumors and eradication of untreated distant metastases. After laser immunotherapy, rats were resistant to tumor rechallenge and developed immunity, which could be adoptively transferred. To better understand the immunity induced in this tumor model, immunization using freeze-thaw DMBA-4 cell lysates was performed, followed by tumor challenge 21 days later. Tumor cell lysate immunization delayed the emergence of metastases but did not provide immunity against the tumor challenge. Also performed was surgical resection of primary tumors before the observation of metastatic tumors. Removal of primary tumors was unsuccessful at changing the course of tumor progression. Tumors re-emerged at the primary sites, and metastases developed at multiple remote sites. In contrast, tumor-bearing rats successfully treated by laser immunotherapy experienced tumor regression and eradication and developed strong resistance to repeated challenges by tumor cells of the same type. Our results show that laser immunotherapy could have potential for the treatment of metastatic tumors by inducing tumor-specific, long-lasting immunity.
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Affiliation(s)
- Wei R Chen
- Department of Physics and Engineering, 221G Howell Hall, University of Central Oklahoma, Edmond, OK 73034, USA.
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Abstract
BACKGROUND Intrathecal cholinesterase inhibitors have been shown to have an antinociceptive effect which is mediated through the spinal cholinergic receptors, mainly muscarinic receptor. Spinal nicotinic receptor also has been involved in the control of nociception. Authors characterized the respective role of muscarinic or nicotinic receptor for the antinociception of cholinesterase inhibitors and further determined the antinociceptive potency of them. METHODS Rats were prepared with intrathecal catheters. Formalin-induced flinching response was regarded as a nociceptive behavior. RESULTS Intrathecal neostigmine, physostigmine and edrophonium produced a dose-dependent suppression of flinching in both phases. Atropine and the M1 selective antagonist attenuated the effect of them, while the M2 selective antagonist did not affect. M3, M4 selective, and nicotinic receptor antagonists reversed the antinociception induced by edrophonium, but by neither neostigmine nor physostigmine. The ordering of potency was neostigmine > physostigmine > > edrophonium. CONCLUSION These data indicate that the nicotinic receptor may be involved, at least in part, in the antinociceptive action of cholinesterase inhibitor at the spinal level, and M1 receptor subtype may be a common pharmacologic site of action. Moreover, neostigmine is more potent than physostigmine and edrophonium.
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Affiliation(s)
- M H Yoon
- Department of Anesthesiology and Pain Medicine, Chonnam National University, Medical School, Gwangju, Korea.
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Yoon HY, Yoon CS, Jeong SW, Kim TJ, Park SY, Chung BH, Choi YM, Lee WC. Prevalence and relative risk of canine dirofilariosis among dogs in Seoul, South Korea. Vet Rec 2002; 151:576-7. [PMID: 12452358 DOI: 10.1136/vr.151.19.576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- H Y Yoon
- College of Veterinary Medicine of Konkuk University, Seoul, Korea
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Yo KY, Lee JU, Kwak SH, Im WM, Jeong CY, Chung SS, Yoon MH, Jeong SW, Park JT. Effects of intracoronary calcium chloride on regional oxygen balance and mechanical function in normal and stunned myocardium in dogs. Br J Anaesth 2002; 88:78-86. [PMID: 11881889 DOI: 10.1093/bja/88.1.78] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 11/13/2022] Open
Abstract
BACKGROUND Brief myocardial ischaemia has been demonstrated to result in mechanical and coronary endothelial dysfunction, in which calcium may play a role. We examined whether the mechanical and vascular responses to calcium are altered in postischaemic, reperfused myocardium. METHODS Regional myocardial oxygen consumption (MVO2), mechanical function and coronary blood flow (CBF) in response to calcium chloride (0.10, 0.25, 0.50 and 0.75 mg ml(-1) of CBF) directly infused into the left anterior descending (LAD) artery were determined before (normal) and 30 min after a 15-min-period of LAD occlusion (stunned) in an open-chest canine model. Percentage segment shortening (%SS) and percentage postsystolic shortening (%PSS) in the LAD territory were determined using ultrasonic crystals and CBF using a Doppler transducer. Myocardial extraction of oxygen (EO2) and lactate (Elac) was calculated. RESULTS The infusion of calcium chloride resulted in dose-dependent increases in %SS and MVO2 but did not affect %PSS in normal myocardium. These changes were accompanied by parallel increases in CBF, resulting in no change in EO2. In stunned myocardium, the responses to calcium chloride were not significantly altered, with the exception of a reduction in %PSS. However, ischaemia and reperfusion itself significantly reduced %SS and Elac and increased %PSS. CONCLUSIONS These data suggest that calcium chloride improves regional systolic and diastolic function both in normal and stunned myocardium. Calcium chloride is unlikely to cause direct coronary vasoconstriction or to deteriorate regional mechanical function in postischaemic myocardium.
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Affiliation(s)
- K Y Yo
- Department of Anesthesiology, Chonnam National University Medical School, Kwangju, Korea
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35
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Cha YJ, Kim HS, Rhim H, Kim BE, Jeong SW, Kim IK. Activation of caspase-8 in 3-deazaadenosine-induced apoptosis of U-937 cells occurs downstream of caspase-3 and caspase-9 without Fas receptor-ligand interaction. Exp Mol Med 2001; 33:284-92. [PMID: 11795493 DOI: 10.1038/emm.2001.46] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
3-Deazaadenosine (DZA), a cellular methylation blocker was reported to induce the caspase-3-like activities-dependent apoptosis in U-937 cells. In this study, we analyzed the activation pathway of the caspase cascade involved in the DZA-induced apoptosis using specific inhibitors of caspases. In the U-937 cells treated with DZA, cytochrome c release from mitochondria and subsequent activation of caspase-9, -8 and -3 were observed before the induction of apoptosis. zDEVD-Fmk, a specific inhibitor of caspase-3, and zLEHD-Fmk, a specific inhibitor of caspase-9, prevented the activation of caspase-8 but neither caspase-3 nor caspase-9, indicating that caspase-8 is downstream of both caspase-3 and caspase-9, which are activated by independent pathways. zVAD-Fmk, a universal inhibitor of caspases, kept the caspase-3 from being activated but not caspase-9. Moreover, ZB4, an antagonistic Fas-antibody, exerted no effect on the activation of caspase-8 and induction of apoptosis by DZA. In addition, zVAD-Fmk and mitochondrial permeability transition pore (MPTP) inhibitors such as cyclosporin A (CsA) and bongkrekic acid (BA) did not block the release of cytochrome c from mitochondria. Taken together, these results suggest that in the DZA-induced apoptosis, caspase-8 may serve as an executioner caspase and be activated downstream of both caspase-3 and caspase-9, independently of Fas receptor-ligand interaction. And caspase-3 seems to be activated by other caspses including IETDase-like enzyme and caspse-9 seems to be activated by cytochrome c released from mitochondria without the involvement of caspases and CsA- and BA- inhibitory MPTP.
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Affiliation(s)
- Y J Cha
- Department of Biochemistry, College of Medicine, The Catholic University of Korea, Seoul
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Choi S, Kim HJ, Ko YS, Jeong SW, Kim YI, Simonds WF, Oh JW, Nah SY. G alpha(q/11) coupled to mammalian phospholipase C beta 3-like enzyme mediates the ginsenoside effect on Ca(2+)-activated Cl(-) current in the Xenopus oocyte. J Biol Chem 2001; 276:48797-802. [PMID: 11673455 DOI: 10.1074/jbc.m104346200] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [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: 11/06/2022] Open
Abstract
Recently we demonstrated that ginsenosides, the active ingredients of Panax ginseng, enhanced Ca(2+)-activated Cl(-) current in the Xenopus oocyte through a signal transduction mechanism involving the activation of pertussis toxin-insensitive G protein and phospholipase C (PLC). However, it has not yet been determined precisely which G protein subunit(s) and which PLC isoform(s) participate in the ginsenoside signaling. To provide answers to these questions, we investigated the changes in ginsenoside effect on the Cl(-) current after intraoocyte injections of the cRNAs coding various G protein subunits, a regulator of G protein signaling (RGS2), and G beta gamma-binding proteins. In addition, we examined which of mammalian PLC beta 1-3 antibodies injected into the oocyte inhibited the action of ginsenosides on the Cl(-) current. Injection of G alpha(q) or G alpha(11) cRNA increased the basal Cl(-) current recorded 48 h after, and it further prevented ginsenosides from enhancing the Cl(-) current, whereas G alpha(i2) and G alpha(oA) cRNA injection had no significant effect. The changes following G alpha(q) cRNA injection were prevented when G beta(1)gamma(2) and G alpha(q) subunits were co-expressed by simultaneous injection of the cRNAs coding these subunits. Injection of cRNA coding G alpha(q)Q209L, a constitutively active mutant that does not bind to G beta gamma, produced effects similar to those of G alpha(q) cRNA injection. The effects of G alpha(q)Q209L cRNA injection, however, were not prevented by co-injection of G beta(1)gamma(2) cRNA. Injection of the cRNA coding RGS2, which interacts most selectively with G alpha(q/11) among various identified RGS isoforms and stimulates the hydrolysis of GTP to GDP in active GTP-bound G alpha subunit, resulted in a severe attenuation of ginsenoside effect on the Cl(-) current. Finally, antibodies against PLC beta 3, but not -beta 1 and -beta 2, markedly attenuated the ginsenoside effect examined at 3-h postinjection. These results suggest that G alpha(q/11) coupled to mammalian PLC beta 3-like enzyme mediates ginsenoside effect on Ca(2+)-activated Cl(-) current in the Xenopus oocyte.
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Affiliation(s)
- S Choi
- National Research Laboratory for the Study of Ginseng Signal Transduction and Department of Physiology, College of Veterinary Medicine, Chonnam National University, Kwangju 500-757 Korea
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Lee H, Lee J, Lee S, Shin Y, Jung W, Kim JH, Park K, Kim K, Cho HS, Ro S, Lee S, Jeong SW, Choi T, Chung HH, Koh JS. A novel class of highly potent, selective, and non-peptidic inhibitor of Ras farnesyltransferase (FTase). Bioorg Med Chem Lett 2001; 11:3069-72. [PMID: 11714612 DOI: 10.1016/s0960-894x(01)00624-2] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [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: 11/26/2022]
Abstract
Design, synthesis and structure-activity relationship of a class of aryl pyrroles as farnesyltransferase inhibitors are described. In vitro and in vivo evaluation of a panel of these inhibitors led to identification of 2 (LB42908) as a highly potent (IC(50)=0.9 nM against H-Ras and 2.4 nM against K-Ras) antitumor agent that is currently undergoing preclinical studies.
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Affiliation(s)
- H Lee
- Life Science R&D, LGCI, Science Town, Taejon 305-380, Republic of Korea
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Park KS, Jeong SW, Cha SK, Lee BS, Kong ID, Ikeda SR, Lee JW. Modulation of N-type Ca2+ currents by A1-adenosine receptor activation in male rat pelvic ganglion neurons. J Pharmacol Exp Ther 2001; 299:501-8. [PMID: 11602660] [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: 02/21/2023] Open
Abstract
Modulation of voltage-activated Ca2+ channels by adenosine was investigated in male rat major pelvic ganglion (MPG) neurons by using the whole-cell variant of the patch-clamp technique. Adenosine inhibited high voltage-activated (HVA) Ca2+ currents in a concentration-dependent manner with an EC50 of 313 nM and a maximal inhibition of 36%, respectively. Inhibition of HVA Ca2+ currents in adrenergic and cholinergic MPG neurons was similar. Adenosine did not modulate T-type Ca2+ channels present in adrenergic MPG neurons. Reverse transcription-polymerase chain reaction analysis indicated that MPG neurons express mRNAs encoding A1 and A2a receptors. Ca2+ current inhibition by adenosine was mimicked by N6-cyclopentyladenosine, an A1-selective agonist (EC50 = 63 nM) and prevented by 100 nM 8-cyclopentyl-1,3-dipropylxanthine, an A1-selective antagonist. Conversely, CGS 21680, an A2a-selective agonist, displayed a relatively low potency (EC50 = 2200 nM) for inhibiting Ca2+ currents. The action of adenosine was significantly attenuated by 2 mM guanosine-5'-thiodiphosphate or 500 ng/ml pertussis toxin. The voltage dependence of adenosine-induced current inhibition was evident by 1) a bell-shaped profile between the current inhibition and test potentials, 2) kinetic slowing in the presence of agonist, and 3) relief of the current inhibition by a conditioning prepulse to +80 mV. Finally, 1 microM omega-conotoxin GVIA occluded adenosine-induced current inhibition. Taken together, we concluded that adenosine inhibits N-type Ca2+ currents by activation of A1 receptors via a voltage-dependent and PTX-sensitive pathway in rat MPG neurons. Our data may explain how adenosine acts as an inhibitory modulator of ganglionic and neuromuscular transmission in the pelvic plexus.
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Affiliation(s)
- K S Park
- Department of Physiology and Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Kangwon-Do, Korea
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Jeong SW, Castel M, Zhang BJ, Fields RL, Paras P, Arnheiter H, Chin H, Gainer H. Cell-specific expression and subcellular localization of neurophysin-CAT-fusion proteins expressed from oxytocin and vasopressin gene promoter-driven constructs in transgenic mice. Exp Neurol 2001; 171:255-71. [PMID: 11573978 DOI: 10.1006/exnr.2001.7785] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [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: 11/22/2022]
Abstract
The cell-specific expression of both the oxytocin (OT) and vasopressin (VP) genes in magnocellular neurons (MCNs) of the hypothalamus has been proposed to be under the control of cis-elements in an intergenic region downstream of the VP gene. We examined this hypothesis using transgenic mice containing mouse genomic DNA-derived constructs linked to chloramphenicol acetyltransferase (CAT) reporters. VP gene expression was studied using constructs containing 3.8 kbp of the 5' flanking region and all the exons and introns in the mouse VP gene, which was fused at the end of exon 3 to a CAT reporter. The two VP-transgene constructs differed by the lengths of their VP gene 3' flanking regions (2.1 versus 3.6 kbp). A similar construct for the oxytocin CAT transgene was used which contained the full-length (3.6 kbp) downstream intergenic region between the mouse genes. All three transgenic constructs produced cell-specific expression of the CAT-reporter in the magnocellular neurons as determined by CAT-immunoreactivity. Oxytocin transgene expression was restricted to OT cells in two founders, and the two VP transgenes to VP cells in five founders. Electron microscopic immunocytochemistry showed that the CAT fusion proteins produced from the OT- and VP-transgenes were efficiently trafficked through the regulated secretory pathways in their respective magnocellular neurons, packaged into large dense core vesicles, and transported to nerve terminals in the posterior pituitary.
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Affiliation(s)
- S W Jeong
- Laboratory of Neurochemistry, NINDS, Bethesda, Maryland 20892-4130, USA
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Abstract
Photolysis experiments were performed to quantify the effect of three anionic surfactants on the photolysis of hydrogen peroxide (H2O2) at the ambient laboratory temperature of 22+/-1 degrees C. H2O2 photolysis in water, methanol, and surfactant monomeric solution was also conducted to compare the photochemical reactivity of H2O2 in different media. Photolysis rates were highest for water, followed by micellar solutions, and lowest for methanol. The results show that the photochemical reactivity of H2O2 is less favorable in organic solvent than in water and surfactant micelles affect H2O2 photolysis. Retarded photolysis of H2O2 in micellar solutions implies that a fraction of H2O2 dissolved in water partitions into micellar pseudophase of surfactant. H2O2 partitioned into micelles has less photochemical reactivity and thus photolysis rate was retarded in the presence of micelles. Photolysis inhibitory level by micelles was shown to be dependent on the kinds of surfactants used in this study. In addition, the inhibitory effect by surfactant monomers was negligible due to the absence of micelles.
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Affiliation(s)
- Y J An
- Department of Civil Engineering, Texas A&M University, College Station 77843-3136, USA.
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41
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Abstract
1. The contribution of endogenous regulators of G protein signalling (RGS) proteins to G protein modulated inwardly rectifying K(+) channel (GIRK) activation/deactivation was examined by expressing mutants of Galpha(oA) insensitive to both pertussis toxin (PTX) and RGS proteins in rat sympathetic neurons. 2. GIRK channel modulation was reconstituted in PTX-treated rat sympathetic neurons following heterologous expression of G protein subunits. Under these conditions, noradrenaline-evoked GIRK channel currents displayed: (1) a prominent lag phase preceding activation, (2) retarded activation and deactivation kinetics, and (3) a lack of acute desensitization. 3. Unexpectedly, heterologous expression of RGS8 in neurons expressing PTX-i-RGS-insensitive Galpha(oA) shortened the lag phase and restored rapid activation, but retarded the deactivation phase further. These effects were found to arise from the N-terminus, but not the core domain, of RGS8 thus suggesting actions on channel modulation independently of GTPase acceleration. 4. These findings indicate that different domains of RGS8 make distinct contributions to the temporal regulation of GIRK channels. The RGS8 core domain accelerates termination of the G-protein cycle presumably by increasing Galpha GTPase activity. In contrast, the N-terminal domain of RGS8 appears to promote entry into the G protein cycle, possibly by enhancing coupling of receptors to the G protein heterotrimer. Together, these opposing effects should allow for an increase in temporal fidelity without a dramatic decrease in signal strength.
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Affiliation(s)
- S W Jeong
- Laboratory of Molecular Physiology, Guthrie Research Institute, One Guthrie Square, Sayre, PA 18840, USA
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Abstract
Hydrated lipid structures, such as liposomes, that display tethered metal-ion-chelating groups have proven useful in peptide and protein binding, as well as 2D protein crystallization through molecular recognition of accessible histidine sites in proteins and peptides. Polymerizable metal-ion-chelating lipids bearing a reactive diacetylene group have been described. These interesting compounds can be polymerized in the solid-analogous phase. Here we describe the design of the first polymerizable metal-ion-chelating lipid that can be used in the fluid, i.e., liquid analogous, phase of lipid bilayers. The synthesis of 1-palmitoyl-2-[8-[(E,E)-2',4'-hexadienoyloxy]octanoyl]-sn-glycero-3-N-[11-[N',N'-bis[carboxymethyl]imino]-3,6,9-trioxaundecanoyl] phosphatidylethanolamine (1) is described. The chelator moiety, iminodiacetate (IDA), was linked to the polymerizable phosphatidylethanolamine (PE) with a terminal 2,4-hexadienoyl (sorbyl) group through an oligo(ethylene glycol)-based spacer. Lipid 1-Cu complex is designed to be combined with the corresponding polymerizable matrix lipids (bis-SorbPC) to form functionalized liposomes that can be stabilized by various polymerization methods.
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Affiliation(s)
- S W Jeong
- C. S. Marvel Laboratories, Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA
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Abstract
UNLABELLED We determined the effects of fentanyl, sufentanil, morphine, and meperidine on the spontaneous contractility of isolated human pregnant uterine muscle strips. Uterine specimens were obtained from normal full-term parturients undergoing elective lower-segment cesarean delivery. Longitudinal muscle strips were prepared and mounted vertically in tissue chambers to record their isometric tension. Opioid concentration-response curves were constructed after rhythmic contractions were established. The responses were also examined in the presence of opioid receptor blocker, nitric oxide synthase inhibitor, beta-adrenoceptor blocker, or cyclooxygenase inhibitor. Fentanyl and meperidine inhibited uterine contractility in a concentration-dependent manner, their concentration that inhibited 50% being 2.3 x 10(-6) and 1.0 x 10(-3)M, respectively. Sufentanil and morphine had no significant effects on uterine contractility. Pretreatment with either naloxone, N(G)-nitro-L-arginine methyl ester, atenolol, or indomethacin did not affect the uterine responses to opioids. These results demonstrate that fentanyl and meperidine may have direct inhibitory effects on the contractility of the human uterus, though at supraclinical concentrations. IMPLICATIONS Opioids do not have a significant effect on spontaneous contractions of gravid human uterine muscle at their clinically relevant concentrations.
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Affiliation(s)
- K Y Yoo
- Department of Anesthesiology, Chonnam National University Medical School, Kwangju, South Korea.
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Kim HS, Jeong SY, Lee JH, Kim BE, Kim JW, Jeong SW, Kim IK. Induction of apoptosis in human leukemia cells by 3-deazaadenosine is mediated by caspase-3-like activity. Exp Mol Med 2000; 32:197-203. [PMID: 11190270 DOI: 10.1038/emm.2000.32] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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: 11/08/2022] Open
Abstract
3-Deazaadenosine (DZA), one of the potent inhibitors of S-adenosylhomocysteine hydrolase, is known to possess several biological properties including an induction of apoptosis. To evaluate a possibility that DZA may be utilized for the treatment of human leukemia, we studied molecular events of cell death induced by DZA in human leukemia HL-60 and U-937 cells. DZA induced a specific cleavage of poly ADP-ribose polymerase (PARP) and an activation of the cysteine protease caspase-3/CPP32 which is known to cleave PARP. DZA-mediated nuclear DNA-fragmentation was completely blocked in the presence of a universal inhibitor of caspases (z-VAD-fmk) or the specific inhibitor of caspase-3 (z-DEVD-fmk) unlike of cycloheximide (CHX). DNA fragmentation was preceded by the lowering of c-myc mRNA in the DZA treated cells. In addition, DZA-induced apoptosis was blocked by pretreatment with adenosine transporter inhibitors such as nitrobenzylthioinosine (NBTI) and dipyridamole (DPD). Taken together, these results demonstrate that DZA-induced apoptosis initiated through an active transport of DZA into human leukemia cells, is dependent on the caspase-3-like activity without de novo synthesis of proteins and possibly involves c-myc down-regulation.
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Affiliation(s)
- H S Kim
- Department of Biochemistry, College of Medicine, The Catholic University of Korea, Seoul
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Abstract
The analgesic effect of ginsenosides or morphine was first determined following intrathecal (i.t.) administration in rat tail-flick test. The effect of chronic i.t. co-administration of ginsenosides with morphine on the development of opioid tolerance were also examined using rat tail-flick test. Administration of ginsenosides (i.t.) produced a weak antinociception in a dose-dependent manner. Administration of morphine (i.t.) also produced antinociception in a dose-dependent manner. The ED50 was 1.20 microg (1.14-1.29 microg). However, acute i.t. co-administration of ginsenosides with morphine was not additive in antinociception. Repeated i.t. co-administration of 200 microg ginsenosides with 10 microg morphine inhibited the development of tolerance induced by 10 microg morphine in rat tail-flick test, although i.t. co-administration of 50 or 100 microg ginsenosides with morphine was without effect. In conclusion, these results indicate that i.t. administered ginsenosides produce an antinociception in rat tail-flick test and also prevent opioid tolerance caused by chronic treatment with morphine at the spinal sites.
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Affiliation(s)
- S Choi
- Dept of Physiology, College of Veterinary Medicine, Chonnam National University, Kwangju, Korea
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Jeong SW, Ikeda SR. Endogenous regulator of G-protein signaling proteins modify N-type calcium channel modulation in rat sympathetic neurons. J Neurosci 2000; 20:4489-96. [PMID: 10844018 PMCID: PMC6772464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Experiments using heterologous overexpression indicate that regulator of G-protein signaling (RGS) proteins play important roles in Gbetagamma-mediated ion channel modulation. However, the roles subserved by endogenous RGS proteins have not been extensively examined because tools for functionally inhibiting natively expressed RGS proteins are lacking. To address this void, we used a strategy in which Galpha(oA) was rendered insensitive to pertussis toxin (PTX) and RGS proteins by site-directed mutagenesis. Either PTX-insensitive (PTX-i) or both PTX- and RGS-insensitive (PTX/RGS-i) mutants of Galpha(oA) were expressed along with Gbeta(1) and Ggamma(2) subunits in rat sympathetic neurons. After overnight treatment with PTX to suppress natively expressed Galpha subunits, voltage-dependent Ca(2+) current inhibition by norepinephrine (NE) (10 microm) was reconstituted in neurons expressing either PTX-i or PTX/RGS-i Galpha(oA). When compared with neurons expressing PTX-i Galpha(oA), the steady-state concentration-response relationships for NE-induced Ca(2+) current inhibition were shifted to lower concentrations in neurons expressing PTX/RGS-i Galpha(oA). In addition to an increase in agonist potency, the expression of PTX/RGS-i Galpha(oA) dramatically retarded the current recovery after agonist removal. Interestingly, the alteration in current recovery was accompanied by a slowing in the onset of current inhibition. Together, our data suggest that endogenous RGS proteins contribute to membrane-delimited Ca(2+) channel modulation by regulating agonist potency and kinetics of G-protein-mediated signaling in neuronal cells.
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Affiliation(s)
- S W Jeong
- Laboratory of Molecular Physiology, Guthrie Research Institute, Sayre, Pennsylvania 18840, USA
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Choi BH, Choi JS, Jeong SW, Hahn SJ, Yoon SH, Jo YH, Kim MS. Direct block by bisindolylmaleimide of rat Kv1.5 expressed in Chinese hamster ovary cells. J Pharmacol Exp Ther 2000; 293:634-40. [PMID: 10773038] [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: 02/16/2023] Open
Abstract
The interaction of bisindolylmaleimide (BIM), widely used as a specific protein kinase C (PKC) inhibitor, with rat brain Kv1.5 (rKv1.5) channels stably expressed in Chinese hamster ovary cells was investigated using the whole-cell patch-clamp technique. BIM (I) and its inactive analog, BIM (V), inhibited rKv1.5 currents at +50 mV in a reversible concentration-dependent manner with an apparent K(d) value of 0.38 and 1.70 microM, respectively. BIM (I) accelerated the decay rate of inactivation of rKv1.5 currents but did not significantly modify the kinetics of current activation. Other specific PKC inhibitors, chelerythrine and PKC 19-36, had no effect on rKv1.5 and did not prevent the inhibitory effect of BIM (I). The inhibition of rKv1.5 by BIM (I) and BIM (V) was highly voltage-dependent between -30 and 0 mV (voltage range of channel opening), suggesting that both drugs interact preferentially with the open state of the channel. The additional inhibition by BIM (I) displayed a voltage dependence (delta = 0.19) in the full activation voltage range positive to 0 mV, but was not shown in BIM (V) (delta = 0). The rate constants of association and dissociation for BIM (I) were 9.63 microM(-1) s(-1) and 5.82 s(-1), respectively. BIM (I) increased the time constant of deactivation of tail currents from 26. 35 to 45.79 ms, resulting in tail crossover phenomenon. BIM (I) had no effect on the voltage dependence of steady-state inactivation. BIM (I) produced use-dependent inhibition of rKv1.5, which was consistent with the slow recovery from inactivation in the presence of drug. These results suggest that BIM (I) directly inhibits rKv1.5 channels in a phosphorylation-independent, and state-, voltage-, time-, and use-dependent manner.
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Affiliation(s)
- B H Choi
- Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Jeong SW, Ikeda SR. Effect of G protein heterotrimer composition on coupling of neurotransmitter receptors to N-type Ca(2+) channel modulation in sympathetic neurons. Proc Natl Acad Sci U S A 2000; 97:907-12. [PMID: 10639178 PMCID: PMC15429 DOI: 10.1073/pnas.97.2.907] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Voltage-dependent (VD) inhibition of N-type Ca(2+) channels is mediated primarily by neurotransmitter receptors that couple to pertussis toxin (PTX)-sensitive G proteins (such as G(o) and G(i)). To date, however, the composition of heterotrimeric complexes, i.e., specific Galphabetagamma combinations, capable of coupling receptors to N-type Ca(2+) channels has not been defined. We addressed this question by heterologously expressing identified Galphabetagamma combinations in PTX-treated rat sympathetic neurons and testing for reconstitution of agonist-mediated VD inhibition. The heterologously expressed Galpha subunits were rendered PTX-insensitive by mutating the codon specifying the ADP ribosylation site. The following results were obtained from this approach. (i) Expression of Galpha(oA), Galpha(oB), and Galpha(i2) (along with Gbeta(1)gamma(2)) reconstituted VD inhibition mediated by alpha(2)-adrenergic, adenosine, somatostatin, and prostaglandin E(2) receptors. Conversely, expression of Galpha(i1) and Galpha(i3) was ineffective at restoring coupling. (ii) Coupling efficiency, as determined from the magnitude of reconstituted Ca(2+) current inhibition, depended on both the receptor and Galpha subtype. The following rank order of coupling efficiency was observed: Galpha(oA) = Galpha(oB) > Galpha(i2) for alpha(2)-adrenergic receptor; Galpha(i2) > Galpha(oA) = Galpha(oB) for adenosine and prostaglandin E(2) receptors; and Galpha(oB) = Galpha(i2) > Galpha(oA) for the somatostatin receptor. (iii) In general, varying the Gbetagamma composition of Galpha(oA)-containing heterotrimers had little effect on the coupling of alpha(2)-adrenergic receptors to the VD pathway. Taken together, these results suggest that multiple, diverse Galphabetagamma combinations are capable of coupling neurotransmitter receptors to VD inhibition of N-type Ca(2+) channels. Thus, if exquisite Galphabetagamma-coupling specificity exists in situ, it cannot arise solely from the inherent inability of other Galphabetagamma combinations to form functional signaling complexes.
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MESH Headings
- Animals
- Binding, Competitive
- Calcium Channels, N-Type/metabolism
- Cattle
- DNA, Recombinant/administration & dosage
- DNA, Recombinant/genetics
- Ganglia, Sympathetic/cytology
- Ganglia, Sympathetic/metabolism
- Heterotrimeric GTP-Binding Proteins/chemistry
- Heterotrimeric GTP-Binding Proteins/genetics
- Heterotrimeric GTP-Binding Proteins/metabolism
- Humans
- Male
- Membrane Potentials/drug effects
- Mice
- Neurons/cytology
- Neurons/metabolism
- Neurons/physiology
- Norepinephrine/pharmacology
- Patch-Clamp Techniques
- Pertussis Toxin
- Protein Binding/drug effects
- Rats
- Rats, Wistar
- Receptors, Adrenergic, alpha-2/metabolism
- Receptors, Neurotransmitter/metabolism
- Superior Cervical Ganglion/cytology
- Superior Cervical Ganglion/metabolism
- Virulence Factors, Bordetella/pharmacology
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Affiliation(s)
- S W Jeong
- Laboratory of Molecular Physiology, Guthrie Research Institute, One Guthrie Square, Sayre, PA 18840, USA
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Jeong SW, Lee SK, Kim KK, Kim H, Kim JY, Chung CK. Prognostic factors in anterior temporal lobe resections for mesial temporal lobe epilepsy: multivariate analysis. Epilepsia 1999; 40:1735-9. [PMID: 10612337 DOI: 10.1111/j.1528-1157.1999.tb01591.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 3.8] [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
PURPOSE Even though there have been several studies on the prognostic factors of temporal lobe epilepsy (TLE) after lobectomy, no studies have been performed for homogeneous mesial TLE. Furthermore, most studies on the predictors of outcome of epileptic surgery were based on univariate analyses and did not consider modern epileptic surgery investigation modalities such as brain magnetic resonance imaging (MRI) and positron emission tomography (PET). We attempted to identify the prognostic factors in anterior temporal lobectomy (ATL) for mesial TLE with multivariate analysis. METHODS Ninety-three patients with mesial TLE (54 men and 39 women, mean age at surgery, 28.3 +/- 8.2 years) were included in the study. The primary outcome variable was the status of patients in the second postoperative year, classified as either seizure free (except aura), or not seizure free. Clinical, electroencephalographic, MRI, PET, Wada test, and pathological data were considered. RESULTS Seventy-eight (84.0%) patients had remission of seizures. With univariate analysis, age at surgery (p < 0.001), epilepsy duration before surgery (p = 0.04), and ipsilateral hippocampal sclerosis on MRI (p = 0.02) were found to be significant. By using multivariate analysis, age at surgery (p = 0.001) and ipsilateral hippocampal sclerosis on MRI (p = 0.03) were found to be the most significant prognostic factors. CONCLUSIONS Age at surgery and hippocampal sclerosis are independent prognostic factors for ATL in mesial TLE. These findings suggest that mesial TLE may be a progressive disorder, and surgical outcome is better when early ATL is performed.
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Affiliation(s)
- S W Jeong
- Department of Neurology, Seoul National University College of Medicine, Korea
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Ikeda SR, Jeong SW, Kammermeier PJ, Ruiz-Velasco V, King MM. Heterologous expression of a green fluorescent protein-pertussis toxin S1 subunit fusion construct disrupts calcium channel modulation in rat superior cervical ganglion neurons. Neurosci Lett 1999; 271:163-6. [PMID: 10507694 DOI: 10.1016/s0304-3940(99)00555-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The fusion construct pEGFP-PTXS1 was assembled by ligating cDNA encoding the S1 subunit of Bordetella pertussis toxin (PTX) into the plasmid pEGFP-C1 (which codes for enhanced green fluorescent protein). Microinjection of pEGFP-PTXS1 (1-100 ng/microl) into the nucleus of dissociated rat sympathetic ganglion neurons resulted in functional expression as determined from the diffuse green fluorescence and disruption of norepinephrine-mediated N-type Ca2+ channel modulation. The heterologously expressed toxin retained specificity for G alpha(i/o)-dependent pathways as VIP-mediated modulation of N-type Ca2+ channels and muscarine-mediated inhibition of M-type K+ channels persisted in pEGFP-PTXS1 expressing neurons. These data demonstrate that the S1 subunit of PTX is readily expressed in mammalian neurons and remains functional following fusion to the C-terminus of another protein.
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Affiliation(s)
- S R Ikeda
- Laboratory of Molecular Physiology, Guthrie Research Institute, Sayre, PA 18840-1692, USA.
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