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Choi M, Son M, Bae S, Lee W, Kim KN, Hyun JK. Interrupting Effect of Social Distancing on Ischemic Heart Disease, Asthma, Stroke, and Suicide Attempt Patients by PM 2.5 Exposure. Yonsei Med J 2024; 65:302-313. [PMID: 38653569 PMCID: PMC11045348 DOI: 10.3349/ymj.2023.0135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 11/29/2023] [Accepted: 12/05/2023] [Indexed: 04/25/2024] Open
Abstract
PURPOSE This study aimed to examine the interrupting effect of social distancing (SD) on emergency department (ED) patients with ischemic heart disease (IHD), stroke, asthma, and suicide attempts by PM2.5 exposure in eight Korean megacities from 2017 to 2020. MATERIALS AND METHODS The study used National Emergency Department Information System and AirKorea data. A total of 469014 patients visited EDs from 2017 to 2020. Interrupted time series analysis was employed to examine changes in the level and slope of the time series, relative risk, and confidence intervals (CIs) by PM2.5 exposure. The SD level was added to the sensitivity analysis. RESULTS The interrupted time series analysis demonstrated a significant increase in the ratio of relative risk (RRR) of IHD patients in Seoul (RRR=1.004, 95% CI: 1.001, 1.006) and Busan (RRR=1.007, 95% CI: 1.002, 1.012) post-SD. Regarding stroke, only patients in Seoul exhibited a significant decrease post-SD (RRR=0.995, 95% CI: 0.991, 0.999). No significant changes were observed for asthma in any of the cities. In the case of suicide attempts, Ulsan demonstrated substantial pre-SD (RR=0.827, 95% CI: 0.732, 0.935) and post-SD (RRR=1.200, 95% CI: 1.057, 1.362) differences. CONCLUSION While the interrupting effect of SD was not as pronounced as anticipated, this study did validate the effectiveness of SD in modifying health behaviors and minimizing avoidable visits to EDs in addition to curtailing the occurrence of infectious diseases.
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Affiliation(s)
- Minseo Choi
- Department of Preventive Medicine, School of Medicine, Kangwon National University, Chuncheon, Korea
| | - Mia Son
- Department of Preventive Medicine, School of Medicine, Kangwon National University, Chuncheon, Korea.
| | - Sanghyuk Bae
- Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
| | - Whanhee Lee
- Biomedical Data Science, BioMedical Convergence Engineering, Pusan National University, Yangsan, Korea
| | - Kyung-Nam Kim
- Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea
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Woo J, Jung S, Kim S, Li Y, Chung H, Roubtsova TV, Zhang H, Caseys C, Kliebenstein D, Kim KN, Bostock RM, Lee YH, Dickman MB, Choi D, Park E, Dinesh-Kumar SP. Attenuation of phytofungal pathogenicity of Ascomycota by autophagy modulators. Nat Commun 2024; 15:1621. [PMID: 38424448 PMCID: PMC10904834 DOI: 10.1038/s41467-024-45839-2] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 02/02/2024] [Indexed: 03/02/2024] Open
Abstract
Autophagy in eukaryotes functions to maintain homeostasis by degradation and recycling of long-lived and unwanted cellular materials. Autophagy plays important roles in pathogenicity of various fungal pathogens, suggesting that autophagy is a novel target for development of antifungal compounds. Here, we describe bioluminescence resonance energy transfer (BRET)-based high-throughput screening (HTS) strategy to identify compounds that inhibit fungal ATG4 cysteine protease-mediated cleavage of ATG8 that is critical for autophagosome formation. We identified ebselen (EB) and its analogs ebselen oxide (EO) and 2-(4-methylphenyl)-1,2-benzisothiazol-3(2H)-one (PT) as inhibitors of fungal pathogens Botrytis cinerea and Magnaporthe oryzae ATG4-mediated ATG8 processing. The EB and its analogs inhibit spore germination, hyphal development, and appressorium formation in Ascomycota pathogens, B. cinerea, M. oryzae, Sclerotinia sclerotiorum and Monilinia fructicola. Treatment with EB and its analogs significantly reduced fungal pathogenicity. Our findings provide molecular insights to develop the next generation of antifungal compounds by targeting autophagy in important fungal pathogens.
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Affiliation(s)
- Jongchan Woo
- Department of Plant Biology and the Genome Center, College of Biological Sciences, University of California, Davis, CA, USA
- Department of Molecular Biology, College of Agriculture, Life Sciences and Natural Resources, University of Wyoming, Laramie, WY, USA
- Plant Immunity Research Center, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Seungmee Jung
- Department of Molecular Biology, College of Agriculture, Life Sciences and Natural Resources, University of Wyoming, Laramie, WY, USA
| | - Seongbeom Kim
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Yurong Li
- Department of Plant Pathology and Microbiology, College of Agriculture and Life Sciences, Texas A & M University, College Station, TX, USA
- Corteva Agriscience, Johnston, IA, USA
| | - Hyunjung Chung
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Tatiana V Roubtsova
- Department of Plant Pathology, College of Agriculture and Environmental Sciences, University of California, Davis, CA, USA
| | - Honghong Zhang
- Department of Plant Pathology and Microbiology, College of Agriculture and Life Sciences, Texas A & M University, College Station, TX, USA
- Fujian University Key Laboratory for Plant-Microbe Interaction, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Celine Caseys
- Department of Plant Sciences, College of Agriculture and Environmental Sciences, University of California, Davis, CA, USA
| | - Dan Kliebenstein
- Department of Plant Sciences, College of Agriculture and Environmental Sciences, University of California, Davis, CA, USA
| | - Kyung-Nam Kim
- Department of Bioindustry and Bioresource Engineering, College of Life Sciences, Sejong University, Seoul, Republic of Korea
| | - Richard M Bostock
- Department of Plant Pathology, College of Agriculture and Environmental Sciences, University of California, Davis, CA, USA
| | - Yong-Hwan Lee
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Martin B Dickman
- Department of Plant Pathology and Microbiology, College of Agriculture and Life Sciences, Texas A & M University, College Station, TX, USA
| | - Doil Choi
- Plant Immunity Research Center, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea.
| | - Eunsook Park
- Department of Molecular Biology, College of Agriculture, Life Sciences and Natural Resources, University of Wyoming, Laramie, WY, USA.
| | - Savithramma P Dinesh-Kumar
- Department of Plant Biology and the Genome Center, College of Biological Sciences, University of California, Davis, CA, USA.
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Kim KN, Kim YM, Le THM. Development of Plug Joint with Polymer-Modified Rubber Asphalt as Filling Material. Polymers (Basel) 2023; 15:4256. [PMID: 37959936 PMCID: PMC10649808 DOI: 10.3390/polym15214256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 10/26/2023] [Accepted: 10/28/2023] [Indexed: 11/15/2023] Open
Abstract
Rising traffic volume, heavy loads, and construction activities have raised concerns about expansion joint device damage. This study focuses on developing an innovative expansion joint using polymer-modified rubber asphalt as the filling material to enhance its service life. Styrene-butadiene-styrene (SBS) emerged as a suitable modifier for rubber-modified asphalt, significantly improving elasticity and adhesion. Through the strategic combination of 3- and 2-block linear SBS, the elasticity and adhesion properties were significantly improved, resulting in the formulation of a well-suited polymer-modified rubber asphalt binder. The developed asphalt binder exhibits impressive elastic recovery (61.1% to 66.1%), surpassing commercial products, with enhanced constructability and workability (15% to 21% viscosity reduction). The carefully engineered mastic asphalt mixture showcases self-leveling characteristics at a moderate 210 °C, addressing historical constructability challenges. Settlement is 40% less than traditional hot mix asphalt for surface layers, with improved moisture and stripping resistance, enhancing existing asphalt plug joint durability and workability. Collectively, this novel mixture, comprising polymer-modified rubber and mastic asphalt, showcases the potential to enhance the durability of existing asphalt plug joints while ensuring superior constructability and workability.
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Affiliation(s)
- Kyung-Nam Kim
- Korea Expressway Corporation Research Institute Pavement Research Division, Dongtansunhwan-daero 17-gil, Hwaseong-si 18489, Gyeonggi-do, Republic of Korea;
| | - Yeong-Min Kim
- Department of Highway & Transportation Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Republic of Korea
| | - Tri Ho Minh Le
- Faculty of Civil Engineering, Nguyen Tat Thanh University, 300A Nguyen Tat Thanh Street, District 4, Ho Chi Minh City 70000, Vietnam;
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Yegya-Raman N, Lee SH, Friedes C, Iocolano M, Kim KN, Duan L, Li B, Sun L, Cohen R, Cengel KA, Levin WP, Langer C, Aggarwal C, Ky B, O'Quinn RP, Zou W, Teo K, Deasy JO, Xiao Y, Feigenberg SJ. Association of Cardiac Dose with Cardiac Events and Survival for Locally Advanced Non-Small Cell Lung Cancer (LA-NSCLC) Treated with Concurrent Chemoradiotherapy (cCRT) in the Era of Immune Checkpoint Inhibitor (ICI) Consolidation. Int J Radiat Oncol Biol Phys 2023; 117:S169-S170. [PMID: 37784421 DOI: 10.1016/j.ijrobp.2023.06.272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) To assess the association of cardiac dose with post-cCRT cardiac events and survival among patients (pts) with LA-NSCLC after adoption of ICI consolidation, modern radiotherapy (RT) techniques, and data-driven cardiac constraints. MATERIALS/METHODS This single-institution, multi-site retrospective study included 335 pts with LA-NSCLC treated with definitive cCRT (60-70 Gy) from October 2017 to December 2021. Pts were evaluated for ICI consolidation. Cardiac dose constraints included heart volume receiving ≥50 Gy (V50) <25% and mean heart dose (MHD) <20 Gy. Heart, left anterior descending artery (LAD), and left ventricle were autocontoured, manually reviewed, and edited. 21 dosimetric parameters (mean dose, max dose, and min dose to the hottest x% volume [Dx%(Gy); x from 5-95 in 5% intervals]) for each were extracted, as well as LAD V15. Baseline cardiovascular disease (bCVD) was defined as heart failure (HF), coronary artery disease, peripheral vascular disease, or cerebrovascular disease. Primary endpoint was post-cCRT major adverse cardiac events (MACE), defined as acute coronary syndrome, HF hospitalization/urgent visit, coronary revascularization, or cardiac death. Secondary endpoints were grade ≥3 cardiac events (CTCAE v5.0), overall survival (OS), cancer specific mortality (CSM), and other cause mortality (OCM). Competing risk regression was used for MACE and grade ≥3 cardiac events, and Cox regression for OS, CSM, and OCM. RESULTS Median age was 68 years, 139 (41%) had bCVD, and 225 (67%) received consolidation ICI. Proton therapy was used in 117 (35%), intensity-modulated RT in 199 (59%), and 3D conformal RT in 19 (6%). Median MHD was 8.7 Gy (IQR 4.6-14.4) and median LAD V15 1.4% (IQR 0-22). Median follow-up was 39.5 months. 35 MACE events occurred; 1- and 2-year cumulative incidence (CI) were 4.2% and 9.5%. No cardiac dosimetric parameter associated with MACE after adjusting for bCVD and age (e.g., MHD sHR 0.98/Gy, 95% CI 0.93-1.03, p = 0.43) or within the following 3 subgroups: no bCVD, photon therapy, and ICI consolidation. 87 grade ≥3 cardiac events occurred; 1- and 2- year CI were 12.6% and 20.4%. Heart dose was not associated with grade ≥3 cardiac events after adjusting for bCVD, ECOG, and BMI (e.g., MHD sHR 1.00/Gy, 95% CI 0.97-1.03, p = 0.85) or within the 3 aforesaid subgroups. 183 OS events occurred, including 125 CSM and 58 OCM events. Multiple cardiac dosimetric parameters associated with worse OS on multivariable analysis (e.g., LAD V15 HR 1.01/%, 95% CI 1.00-1.02, p = 0.003), driven by associations with CSM (LAD V15 HR 1.02/%, p<0.001) but not OCM (LAD V15 HR 1.00/%, p = 0.73). Median OS was worse for LAD V15 ≥10% (22.2 vs 35.1 months, p = 0.004). CONCLUSION Among pts with LA-NSCLC treated with cCRT after adoption of ICI consolidation, modern RT techniques, and cardiac constraints, post-cCRT cardiac events were common but showed no association with cardiac dose. Cardiac dose associated with OS, driven by an association with CSM and not OCM, which may not reflect cardiac toxicity.
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Affiliation(s)
- N Yegya-Raman
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - S H Lee
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - C Friedes
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - M Iocolano
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - K N Kim
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - L Duan
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - B Li
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - L Sun
- Department of Hematology and Oncology, University of Pennsylvania, Philadelphia, PA
| | - R Cohen
- Department of Hematology and Oncology, University of Pennsylvania, Philadelphia, PA
| | - K A Cengel
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - W P Levin
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - C Langer
- Department of Hematology and Oncology, University of Pennsylvania, Philadelphia, PA
| | - C Aggarwal
- Department of Hematology and Oncology, University of Pennsylvania, Philadelphia, PA
| | - B Ky
- Division of Cardiovascular Medicine, University of Pennsylvania, Philadelphia, PA
| | - R P O'Quinn
- Division of Cardiovascular Medicine, University of Pennsylvania, Philadelphia, PA
| | - W Zou
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - K Teo
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - J O Deasy
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Y Xiao
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
| | - S J Feigenberg
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA
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Kim KN, Le THM. Durability of Polymer-Modified Asphalt Mixture with Wasted Tire Powder and Epoxy Resin under Tropical Climate Curing Conditions. Polymers (Basel) 2023; 15:polym15112504. [PMID: 37299303 DOI: 10.3390/polym15112504] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 05/25/2023] [Accepted: 05/27/2023] [Indexed: 06/12/2023] Open
Abstract
The quality of pavements in tropical climates is negatively affected by the frequent wet and dry cycles during the rainy season, as well as by issues related to overloading from heavy trucks and traffic congestion. Contributing to this deterioration are factors such as acid rainwater, heavy traffic oils, and municipal debris. In light of these challenges, this study aims to assess the viability of a polymer-modified asphalt concrete mixture. This study investigates the feasibility of a polymer-modified asphalt concrete mixture with the addition of 6% crumb rubber powder from waste car tires and 3% epoxy resin to counter the harsh conditions of tropical climate weather. The study involved subjecting test specimens to five to 10 cycles of contaminated water (100% rainwater + 10% used oil from trucks), curing for 12 h, and air drying in a chamber of 50 °C for 12 h to simulate critical curing conditions. The specimens underwent fundamental laboratory performance tests such as the indirect tensile strength test, dynamic modulus test, four points bending test, and Cantabro test, as well as the double load condition in the Hamburg wheel tracking test to determine the effectiveness of the proposed polymer-modified material in actual conditions. The test results confirmed that the simulated curing cycles had a critical impact on the durability of the specimens, with the greater curing cycles leading to a significant drop in the strength of the material. For example, the TSR ratio of the control mixture dropped from 90% to 83% and 76% after five and 10 curing cycles, respectively. Meanwhile, the modified mixture showed a decrease from 93% to 88% and 85% under the same conditions. The test results revealed that the effectiveness of the modified mixture outperformed the conventional condition in all tests, with a more prominent impact observed under overload conditions. Under double conditions in the Hamburg wheel tracking test and a curing condition of 10 cycles, the maximum deformation of the control mixture sharply increased from 6.91 to 22.7 mm, whereas the modified mixture increased from 5.21 to 12.4 mm. Overall, the test results confirm the durability of the polymer-modified asphalt concrete mixture under harsh tropical climate conditions, promoting its application for sustainable pavements, especially in Southeast Asian countries.
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Affiliation(s)
- Kyung-Nam Kim
- Department of Highway & Transportation Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-si 10223, Gyeonggi-Do, Republic of Korea
| | - Tri Ho Minh Le
- Faculty of Civil Engineering, Nguyen Tat Thanh University, 300A Nguyen Tat Thanh Street, District 4, Ho Chi Minh City 70000, Vietnam
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Kim KN, Kim YM, Lee SY, Le THM. Heat Transfer Analysis of Warm Guss Asphalt Concrete for Mini-Trench Overlaying. Materials (Basel) 2023; 16:2808. [PMID: 37049108 PMCID: PMC10096433 DOI: 10.3390/ma16072808] [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] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/09/2023] [Accepted: 03/29/2023] [Indexed: 06/19/2023]
Abstract
Conventional hot mix asphalt overlaying on trench infrastructure typically necessitates extended cooling times for further works and can have adverse effects on buried components, such as electricity cables and hot water pipes. Therefore, this research aims to investigate the use of warm guss mastic asphalt (at an installation temperature of 160 °C) as an overlaying material for mini-trenches, which can reduce the cooling time required for traffic opening and improve the efficiency of the construction process. This research involved two stages: first, lab testing and related research results were used to generate the thermal conductivity and specific heat necessary for simulation work. Second, a finite element model analysis was conducted to evaluate the thermal transmission of the overlaying surface and the buried conduit based on the summer pavement temperature distribution through the Korean Pavement Research Program. Afterward, the field test bed was constructed to verify the simulation. The results indicate that the optimal thickness of the overlaying material and the concrete covering should be designed to ensure thermal durability and meet traffic opening requirements. The overlaying depth of the mini trench using warm mix guss mastic asphalt should be less than 100 mm to meet with the traffic opening time, while the thickness of the concrete covering should be designed to be more than 100 mm to ensure thermal durability. Additionally, the findings suggest that the application of warm guss asphalt could reduce the opening time by 30 min to 1 h and 25 min compared to conventional hot guss asphalt materials. When the pavement surface temperature for the traffic opening is controlled at 50 °C, the asphalt mixture requires at least 2 h to 5 h to meet the cooling criteria for traffic opening, respectively. Overall, this research confirms the potential benefits and optimal use of warm guss mastic asphalt in the construction process of mini-trenches.
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Affiliation(s)
- Kyung-Nam Kim
- Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-si 10223, Republic of Korea; (K.-N.K.); (Y.-M.K.)
| | - Yeong-Min Kim
- Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-si 10223, Republic of Korea; (K.-N.K.); (Y.-M.K.)
| | - Sang-Yum Lee
- Faculty of Civil Engineering, Induk University, 12 Choansan-ro Nowon-gu, Seoul 01878, Republic of Korea
| | - Tri Ho Minh Le
- Faculty of Civil Engineering, Nguyen Tat Thanh University, 300A Nguyen Tat Thanh Street, District 4, Ho Chi Minh City 70000, Vietnam;
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Lee MK, Kim KN, Jeong MA, Kim SY, Oh MS, Kwon BS. Facemask ventilation and vocal cord angle following neuromuscular blockade: a prospective observational study . Anaesthesia 2022; 77:1010-1017. [PMID: 35727620 DOI: 10.1111/anae.15786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2022] [Indexed: 11/29/2022]
Abstract
Numerous studies support the idea that neuromuscular blockade facilitates facemask ventilation after induction of anaesthesia. Although improved airway patency or pulmonary compliance and a resolution of laryngospasm have been suggested as possible causes, the exact mechanism remains unclear. We aimed to assess whether neuromuscular blockade improves facemask ventilation and to clarify whether this phenomenon is associated with the vocal cord angle. This prospective observational study included patients aged between 20 and 65 years scheduled for elective surgery under general anaesthesia. After induction of anaesthesia, patients' lungs were ventilated with pressure-controlled ventilation using a facemask. During facemask ventilation, a flexible bronchoscope was inserted through a self-sealing diaphragm at the elbow connector attached to the facemask and breathing circuit and positioned to allow a continuous view of the vocal cords. The mean tidal volume and vocal cord angle were measured before and after administration of neuromuscular blocking drugs. Of 108 patients, 100 completed the study. Mean (SD) tidal volume ((11.0 (3.9) ml.kg-1 vs. 13.6 (2.6) ml.kg-1 ; p < 0.001) and mean (SD) vocal cord angle (17° (10°) vs. 26° (5°); p < 0.001) increased significantly after neuromuscular blockade. The proportional increase in mean tidal volume after neuromuscular blockade was positively correlated with vocal cord angle (Spearman's ρ = 0.803; p < 0.001). In conclusion, neuromuscular blockade facilitated facemask ventilation, and the improvement was correlated with further opening of the vocal cords.
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Affiliation(s)
- M K Lee
- Department of Anaesthesiology and Pain Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
| | - K N Kim
- Department of Anaesthesiology and Pain Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
| | - M A Jeong
- Department of Anaesthesiology and Pain Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
| | - S Y Kim
- Department of Anaesthesiology and Pain Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
| | - M S Oh
- College of Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
| | - B S Kwon
- Department of Anaesthesiology and Pain Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
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Kim KN, Wescott DL, Franzen PL, Hasler BP, Roecklein KA. 1092 Attention-deficit/hyperactivity Disorder Symptoms And Sleep Characteristics Within A Seasonal Affective Disorder Spectrum. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.1087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
Seasonal affective disorder (SAD) increases risk for attention-deficit/hyperactivity disorder (ADHD), although the mechanism linking SAD and ADHD is unknown. Prior research has identified insomnia and delayed sleep phase in both ADHD and SAD. We hypothesized that sleep duration and timing in SAD would be associated with the severity of ADHD symptoms.
Methods
Adults with SAD (n = 45) and subsyndromal SAD (S-SAD; n = 18) aged 19-66 years from Pittsburgh, PA., were assessed for ADHD symptoms, self-report sleep quality, depression severity, and daytime sleepiness in the Winter. Participants wore an Actiwatch for 4-14 days, from which we calculated sleep-onset latency, total sleep time, sleep midpoint, and sleep efficiency. We conducted a hierarchical multivariate linear regression to determine if sleep characteristics predict ADHD symptom severity in our sample while controlling for depressive symptoms. Age and gender were added in Step 1, seasonal depression severity in Step 2, actigraphy-based total sleep time, sleep onset latency, midpoint, and efficiency in Step 3, and self-reported sleep quality and daytime sleepiness in Step 4.
Results
Participants mostly scored in the “likely” or “highly likely” ADHD range (87.30%, n=55), higher than the national prevalence rate (4.4%). When controlling for age, gender, and depression severity, only shorter actigraphy-based total sleep time was associated with higher ADHD symptom severity (β=-0.30, p<0.05). However, when self-reported sleep quality and daytime sleepiness were added as predictors, total sleep time was no longer a statistically-significant predictor of ADHD symptom severity and only daytime sleepiness predicted ADHD symptom severity (β=0.31, p<0.05).
Conclusion
Our results suggest that individuals with SAD who experience daytime sleepiness and/or possibly shorter actigraphy-based sleep duration experience higher ADHD symptom severity. Treatments like Trans-C or CBT-I to improve daytime sleepiness and sleep duration may be indicated for SAD patients who present with comorbid ADHD symptoms.
Support
NIMH K.A.R. MH103303
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Affiliation(s)
- K N Kim
- Carnegie Mellon University Department of Psychology, Pittsburgh, PA
| | - D L Wescott
- University of Pittsburgh Department of Psychology, Pittsburgh, PA
| | - P L Franzen
- University of Pittsburgh Department of Psychiatry, Pittsburgh, PA
| | - B P Hasler
- University of Pittsburgh Department of Psychiatry, Pittsburgh, PA
| | - K A Roecklein
- University of Pittsburgh Department of Psychology, Pittsburgh, PA
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Lim HY, Kim KN, Jun JH, Lee SW, Kang MS. Reporting of randomized controlled trials in International Journal of Obstetric Anesthesia. Int J Obstet Anesth 2019; 41:114-115. [PMID: 31204097 DOI: 10.1016/j.ijoa.2019.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 04/07/2019] [Accepted: 04/10/2019] [Indexed: 11/26/2022]
Affiliation(s)
- H Y Lim
- Department of Anesthesiology and Pain Medicine, Hanyang University Hospital, College of Medicine, Seoul, Republic of Korea
| | - K N Kim
- Department of Anesthesiology and Pain Medicine, Hanyang University Hospital, College of Medicine, Seoul, Republic of Korea.
| | - J H Jun
- Department of Anesthesiology and Pain Medicine, Hanyang University Hospital, College of Medicine, Seoul, Republic of Korea
| | - S W Lee
- Department of Urology, Hanyang University Guri Hospital, College of Medicine, Seoul, Republic of Korea
| | - M S Kang
- Department of Anesthesiology and Pain Medicine, Hanyang University Hospital, College of Medicine, Seoul, Republic of Korea
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Cho JH, Choi MN, Yoon KH, Kim KN. Ectopic Expression of SjCBL1, Calcineurin B-Like 1 Gene From Sedirea japonica, Rescues the Salt and Osmotic Stress Hypersensitivity in Arabidopsis cbl1 Mutant. Front Plant Sci 2018; 9:1188. [PMID: 30210512 PMCID: PMC6123687 DOI: 10.3389/fpls.2018.01188] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 07/25/2018] [Indexed: 05/22/2023]
Abstract
Extensive studies with Arabidopsis thaliana suggested that calcineurin B-like (CBL) proteins constitute a unique family of calcium sensors in plants, which mediate a variety of abiotic stress responses. However, little is known about their function in most plants that do not have available genome sequences. In this study, we have developed a pair of universal primers that make it possible to isolate CBL1-like genes from various plants without sequence information. Using these primers, we successfully cloned a full-length cDNA of CBL1-like gene in Sedirea japonica (SjCBL1). Bimolecular fluorescence complementation (BiFC) and pull-down assays demonstrated that like Arabidopsis CBL1 (AtCBL1), SjCBL1 can interacts physically with Arabidopsis CBL-interacting protein kinase 1 (AtCIPK1) at the plasma membrane of plant cells in a Ca2+-dependent manner. In addition, overexpression of SjCBL1 in the Arabidopsis cbl1 mutant resulted in not only rescuing the hypersensitive phenotype toward salt and osmotic stresses, but also substantially enhancing the tolerance to them. Taken together, these results strongly suggest that SjCBL1 is a functional ortholog of AtCBL1 in Sedirea japonica, which can play a critical role in response to salt and osmotic stresses. Therefore, it is clear that our findings should significantly contribute to broadening and deepening our understanding of the CBL1-mediated Ca2+ signaling networks in the plant kingdom.
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Affiliation(s)
| | | | | | - Kyung-Nam Kim
- Department of Molecular Biology, PERI, Sejong University, Seoul, South Korea
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11
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Lee CK, Choi SK, Shin DA, Yi S, Kim KN, Kim I, Ha Y. Parkinson's disease and the risk of osteoporotic vertebral compression fracture: a nationwide population-based study. Osteoporos Int 2018; 29:1117-1124. [PMID: 29460103 DOI: 10.1007/s00198-018-4409-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 01/24/2018] [Indexed: 01/23/2023]
Abstract
UNLABELLED Patients with Parkinson's disease (PD) were at higher risk of osteoporotic vertebral compression fractures (OVCF) compared to controls and had elevated mortality rates. Compared to conservative treatment, surgical treatment for OVCF in PD patients seemed to be associated with better outcomes. INTRODUCTION The purpose of this study was to evaluate the risk of OVCF in patients with PD. METHODS Data from patients over the age of 60 years who were diagnosed with PD were collected between 2004 and 2013 from the Korean National Health Insurance Database (n = 3370). The comparison group (non-PD) consisted of randomly selected patients (five per patient with PD; n = 16,850) matched to the PD group, who were newly diagnosed annually according to age and sex. Cox proportional hazard regressions were used to examine the relationships between osteoporosis, OVCF, surgery for OVCF, and PD. Household income and residential area of patients were also assessed. Overall survival rates were calculated after adjusting for confounding factors, such as hypertension, diabetes mellitus, and chronic kidney disease. RESULTS OVCF was developed in 12.5% of patients in the PD group and in 7.4% of patients in the control group. PD was associated with increased risk of osteoporosis (hazard ratio [HR], 1.32; 95% confidence interval [CI], 1.21-1.43; p < 0.001), OVCF (HR 1.66; 95% CI, 1.47-1.87; p < 0.001), and surgery for OVCF (HR 2.69; 95% CI, 1.78-4.08; p < 0.001). Household income was not significantly related with development of osteoporosis, incidence of OVCF, or surgery for OVCF. Residential area was statistically associated with osteoporosis, OVCF, and surgery for OVCF. The mortality rate of the PD group was about 1.7 times higher than that of the non-PD group after adjusting for potential confounders, and the mortality rate of the PD with OVCF group was higher than that of the non-PD group, but not significantly (p = 0.09). The survival rate of the PD group with surgery for OVCF showed a trend toward a more positive prognosis compared with that of the PD group with conservative treatment. CONCLUSIONS Patients with PD had significantly increased risk of osteoporosis and OVCF. Surgical treatment for OVCF in PD patients was associated with a better prognosis than conservative treatment.
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Affiliation(s)
- C K Lee
- Department of Neurosurgery, Keimyung University Dongsan Medical Center, Daegu, South Korea
- Department of Neurosurgery, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - S K Choi
- Biostatistics and Epidemiology, Neurosurgery, Yonsei University College of Medicine, Seoul, South Korea
| | - D A Shin
- Department of Neurosurgery, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - S Yi
- Department of Neurosurgery, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - K N Kim
- Department of Neurosurgery, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - I Kim
- Department of Neurosurgery, Keimyung University Dongsan Medical Center, Daegu, South Korea
| | - Y Ha
- Department of Neurosurgery, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, South Korea.
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Park C, Chae Lim W, Baek W, Kim JH, Lim S, Kim HS, Kim KN, Lee CS. The Pepper WPP Domain Protein, CaWDP1, Acts as a Novel Negative Regulator of Drought Stress via ABA Signaling. Plant Cell Physiol 2017; 58:1118. [PMID: 28482073 DOI: 10.1093/pcp/pcx055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- Chanmi Park
- Department of Molecular Biology, College of Natural Sciences, Dongeui University, Busan, Korea
| | - Woo Chae Lim
- Department of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Korea
| | - Woonhee Baek
- Department of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Korea
| | - Jung-Hyun Kim
- Department of Physical Education, Chung-Ang University, Seoul, Korea
| | - Sohee Lim
- Department of Life Science (BK21 program), Chung-Ang University, Seoul, Korea
| | - Hyon Sang Kim
- Department of Bioscience and Bioinformatics, College of Natural Science, Myongji University, Yongin, Kyeonggi-Do, Korea
| | - Kyung-Nam Kim
- Department of Molecular Biology, PERI, Sejong University, Seoul, Korea
| | - Chul Sung Lee
- Department of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Korea
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Park C, Lim CW, Baek W, Kim JH, Lim S, Kim SH, Kim KN, Lee SC. The Pepper WPP Domain Protein, CaWDP1, Acts as a Novel Negative Regulator of Drought Stress via ABA Signaling. Plant Cell Physiol 2017; 58:779-788. [PMID: 28339719 DOI: 10.1093/pcp/pcx017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 01/22/2017] [Indexed: 05/05/2023]
Abstract
Plants are constantly challenged by various environmental stresses, including high salinity and drought, and they have evolved defense mechanisms to counteract the deleterious effects of these stresses. The plant hormone ABA regulates plant growth and developmental processes and mediates abiotic stress responses. Here, we report the identification and characterization of a novel CaWDP1 (Capsicum annuum) protein. The expression of CaWDP1 in pepper leaves was induced by ABA, drought and NaCl treatments, suggesting its role in the abiotic stress response. CaWDP1 proteins show conserved sequence homology with other known WDP1 proteins, and they are localized in the nucleus and cytoplasm. We generated CaWDP1-silenced peppers via virus-induced gene silencing (VIGS). We evaluated the responses of these CaWDP1-silenced pepper plants and CaWDP1-overexpressing (OX) transgenic Arabidopsis plants to ABA and drought. CaWDP1-silenced pepper plants displayed enhanced tolerance to drought stress, and this was characterized by low levels of leaf water loss in the drought-treated leaves. In contrast to CaWDP1-silenced plants, CaWDP1-OX plants exhibited an ABA-hyposensitive and drought-susceptible phenotype, which was accompanied by high levels of leaf water loss, low leaf temperatures, increased stomatal pore size and low expression levels of stress-responsive genes. Our results indicate that CaWDP1, a novel pepper negative regulator of ABA, regulates the ABA-mediated defense response to drought stress.
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Affiliation(s)
- Chanmi Park
- Department of Life Science (BK21 program), Chung-Ang University, Seoul, Korea
- These authors contributed equally to this work
| | - Chae Woo Lim
- Department of Life Science (BK21 program), Chung-Ang University, Seoul, Korea
- These authors contributed equally to this work
| | - Woonhee Baek
- Department of Life Science (BK21 program), Chung-Ang University, Seoul, Korea
- These authors contributed equally to this work
| | - Jung-Hyun Kim
- Department of Physical Education, Chung-Ang University, Seoul 06911, Korea
- These authors contributed equally to this work
| | - Sohee Lim
- Department of Life Science (BK21 program), Chung-Ang University, Seoul, Korea
| | - Sang Hyon Kim
- Department of Bioscience and Bioinformatics, College of Natural Science, Myongji University, Yongin, Kyeonggi-Do17058, Korea
| | - Kyung-Nam Kim
- Department of Molecular Biology, PERI, Sejong University, Seoul 05000, Korea
| | - Sung Chul Lee
- Department of Life Science (BK21 program), Chung-Ang University, Seoul, Korea
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Cho JH, Lee JH, Park YK, Choi MN, Kim KN. Calcineurin B-like Protein CBL10 Directly Interacts with TOC34 (Translocon of the Outer Membrane of the Chloroplasts) and Decreases Its GTPase Activity in Arabidopsis. Front Plant Sci 2016; 7:1911. [PMID: 28018422 PMCID: PMC5156837 DOI: 10.3389/fpls.2016.01911] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 12/02/2016] [Indexed: 05/27/2023]
Abstract
As calcium sensor relays in plants, calcineurin B-like (CBL) proteins provide an important contribution to decoding Ca2+ signatures elicited by a variety of abiotic stresses. Currently, it is well known that CBLs perceive and transmit the Ca2+ signals mainly to a group of serine/threonine protein kinases called CBL-interacting protein kinases (CIPKs). In this study, we report that the CBL10 member of this family has a novel interaction partner besides the CIPK proteins. Yeast two-hybrid screening with CBL10 as bait identified an Arabidopsis cDNA clone encoding a TOC34 protein, which is a member of the TOC (Translocon of the Outer membrane of the Chloroplasts) complex and possesses the GTPase activity. Further analyses showed that in addition to CBL10, CBL7 also interacts with TOC34 at much lower strength in the yeast two-hybrid system. However, the rest of the CBL family members failed to interact with TOC34. Bimolecular fluorescence complementation (BiFC) analysis verified that the CBL10-TOC34 interaction occurs at the outer membrane of chloroplasts in vivo. In addition, we also demonstrated that CBL10 physically associates with TOC34 in vitro, resulting in a significant decrease in the GTPase activity of the TOC34 protein. Taken together, our findings clearly indicate that a member of the CBL family, CBL10, can modulate not only the CIPK members but also TOC34, allowing the CBL family to relay the Ca2+ signals in more diverse ways than currently known.
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Affiliation(s)
| | | | | | | | - Kyung-Nam Kim
- Department of Molecular Biology, PERI, Sejong UniversitySeoul, South Korea
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15
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Ok SH, Cho JH, Oh SI, Choi MN, Ma JY, Shin JS, Kim KN. Calcineurin B-like 3 calcium sensor associates with and inhibits 5'-methylthioadenosine nucleosidase 2 in Arabidopsis. Plant Sci 2015; 238:228-40. [PMID: 26259190 DOI: 10.1016/j.plantsci.2015.06.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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: 02/09/2015] [Revised: 06/16/2015] [Accepted: 06/16/2015] [Indexed: 05/04/2023]
Abstract
Calcineurin B-like (CBL) proteins constitute a unique family of calcium sensor relays in plants. It is well known that CBLs detect the calcium signals elicited by a variety of abiotic stresses and relay the information to a group of serine/threonine protein kinases called CBL-interacting protein kinases (CIPKs). In this study, we found that a few CBL members can also target another group of enzymes 5'-methylthioadenosine nucleosidases (MTANs), which are encoded by two genes in Arabidopsis, AtMTAN1 and AtMTAN2. In the yeast two-hybrid system, AtMTAN1 interacted with multiple CBL members such as CBL2, CBL3 and CBL6, whereas AtMTAN2 associated exclusively with CBL3. We further demonstrated that the CBL3-AtMTAN2 association occurs in a calcium-dependent manner, which results in a significant decrease in the enzyme activity of the AtMTAN2 protein. Taken together, these results clearly indicate that the CBL family can target at least two distinct groups of enzymes (CIPKs and MTANs), conferring an additional level of complexity on the CBL-mediated signaling networks. In addition, our finding also provides a novel molecular mechanism by which calcium signals are transduced to alter metabolite profiles in plants.
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Affiliation(s)
- Sung Han Ok
- Department of Molecular Biology, PERI, Sejong University, Seoul 143-747, Republic of Korea
| | - Joo Hyuk Cho
- Department of Molecular Biology, PERI, Sejong University, Seoul 143-747, Republic of Korea
| | - Seung-Ick Oh
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Mi Na Choi
- Department of Molecular Biology, PERI, Sejong University, Seoul 143-747, Republic of Korea
| | - Jae-Yeon Ma
- Department of Molecular Biology, PERI, Sejong University, Seoul 143-747, Republic of Korea
| | - Jeong-Sheop Shin
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Kyung-Nam Kim
- Department of Molecular Biology, PERI, Sejong University, Seoul 143-747, Republic of Korea.
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16
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Park H, Kim KN. Effect of cobalt sulfate contents on the ceramic surface coating using spray technique. Journal of the Korean Crystal Growth and Crystal Technology 2014. [DOI: 10.6111/jkcgct.2014.24.6.256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Ok SH, Park CS, Kim HJ, Lee SH, Choi BH, Eun SY, Kim KN, Yang SM, Shin IW, Choi MJ, Sohn JT. Effect of two lipid emulsions on reversing high-dose levobupivacaine-induced reduced vasoconstriction in the rat aortas. Cardiovasc Toxicol 2014; 13:370-80. [PMID: 23877627 DOI: 10.1007/s12012-013-9218-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The goals of this study were to determine which lipid emulsion (Intralipid(®) and Lipofundin MCT/LCT(®)) is more effective in reversing high-dose levobupivacaine-induced reduced vasoconstriction in isolated rat aortas and to examine the associated cellular mechanisms with a particular focus on the endothelium. Two lipid emulsion concentration-response curves were generated using high-dose levobupivacaine-induced reduced vasoconstriction and vasodilation of isolated aortas pretreated with or without 60 mM KCl. Endothelial nitric oxide synthase (eNOS) and caveolin-1 phosphorylation were measured in rat aortic tissue treated with levobupivacaine in the presence or absence of lipid emulsion. Dichlorofluorescein oxidation, a measure of reactive oxygen species production, was measured in lipid emulsion-treated human umbilical vein endothelial cells. In levobupivacaine (0.3 mM)-induced reduced vasoconstriction of isolated aorta, the magnitude of the Intralipid(®)- and Lipofundin MCT/LCT(®)-mediated reversal was not significantly different. Lipid emulsion reversal of levobupivacaine-induced reduced vasoconstriction was greater in endothelium-intact aortas than in endothelium-denuded aortas. The two lipid emulsions similarly inhibited levobupivacaine-induced eNOS phosphorylation in aortic tissue. Pretreatment with both lipid emulsions increased dichlorofluorescein oxidation. Both Intralipid(®) and Lipofundin MCT/LCT(®) are equally effective for vascular tone recovery from high-dose levobupivacaine-induced reduced vasoconstriction. This reversal is mediated partially by decreasing nitric oxide bioavailability.
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Affiliation(s)
- Seong-Ho Ok
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, 660-702, Republic of Korea
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Choi ID, Kim KN, Yun CW, Choi YJ. Cloning and Characterization of the HPr Kinase/Phosphorylase Gene fromBacillus stearothermophilusNo. 236. Biosci Biotechnol Biochem 2014; 70:1089-101. [PMID: 16717408 DOI: 10.1271/bbb.70.1089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The Bacillus stearothermophilus no. 236 gene encoding the bifunctional enzyme HprK/P, the key regulator of carbon catabolite repression/activation (CCR/CCA) in most Gram-positive bacteria, was cloned and the (His)(6)-tagged gene product was characterized in detail. The nucleotide sequence of the hprK/P gene corresponded to an open reading frame of 951 bp that encoded a polypeptide of 316 amino acid residues with a calculated molecular mass of 35,458 Da. The deduced amino acid sequence of the B. stearothermophilus no. 236 HprK/P showed 64.5% identity with the B. subtilis enzyme, allowing us to identify two highly conserved motifs, the nucleotide binding P-loop (Walker motif A) and the HprK/P family signature sequence in the C-terminal half of the protein. Furthermore, complementation experiments showed that the cloned hprK/P gene product was functionally active in the B. subtilis cells. The purified (His)(6)-tagged B. stearothermophilus no. 236 HprK/P migrated on SDS-PAGE gel as a single species with a molecular mass of about 36 kDa, and behaved in gel filtration like a hexameric protein. The recombinant protein catalyzes the pyrophosphate (PPi)-dependent (highest activity at pH 7.0 and 40 degrees C) as well as the ATP-dependent phosphorylation of Ser46 in HPr (maximum activity at pH 8.0 and 45 degrees C). It also catalyzes the inorganic phosphate-dependent dephosphorylation (phosphorolysis) of seryl-phosphorylated HPr, optimally at pH 6.5 and 40 degrees C. BIAcore surface resonance analysis confirmed that a divalent cation, preferentially Mg(2+), was an indispensable cofactor for the three activities of the HprK/P. Fructose-1,6-bisphosphate (FBP) was observed to stimulate ATP-dependent kinase activity, while inorganic phosophate (Pi) inhibited ATP-dependent kinase activity. Mutations in the Walker motif A simultaneously abolished both types of kinase and phosphorylase activities. On the other hand, the conserved signature residues were confirmed to be involved in the PPi-dependent kinase and phosphorylase reactions.
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Affiliation(s)
- Il-Dong Choi
- Graduate School of Life Sciences and Biotechnology, Korea University, Seoul
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19
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Han IB, Ropper AE, Teng YD, Shin DA, Jeon YJ, Park HM, Shin DE, Park YS, Kim KN, Kim NK. Association between VEGF and eNOS gene polymorphisms and lumbar disc degeneration in a young Korean population. Genet Mol Res 2013; 12:2294-305. [PMID: 23884772 DOI: 10.4238/2013.july.8.10] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Disturbances in blood flow to intervertebral discs (IVD) play an important role in IVD degeneration. Vascular endothelial growth factor (VEGF) and endothelial nitric oxide synthase (eNOS) are extremely important angiogenic factors for vasodilation and neovascularization. We investigated the relationship between single nucleotide polymorphisms (SNPs) of the VEGF and eNOS genes and genetic susceptibility to lumbar IVD degeneration in a young adult Korean population. Two hundred and forty-one participants (aged 18 to 30 years), with or without low back pain, were selected for the study. Magnetic resonance imaging was made of the lumbar spine in all participants. The patient group (N = 102) had low back pain clinically and lumbar IVD degeneration radiographically. The control group (N = 139) included subjects with and without low back pain; all were negative radiographically for lumbar IVD degeneration. Using PCR-RFLP analysis, we analyzed VEGF (-2578C>A, -1154G>A, -634G>C, and 936C>T) and eNOS (-786T>C, 4a4b and 894G>T) SNPs. We made combined analyses of the genes and performed haplotype analyses. There were no significant differences in the genotype distribution of polymorphisms of VEGF and eNOS genes among patients and controls. However, the frequency of VEGF -2578CA +AA/-634CC combined genotypes was significantly higher in patients when compared with controls [odds ratio (OR) = 21.00; 95% confidence interval (CI) = 2.590- 170.240]. The frequencies of the -2578A/-1154A/-634C/936C (OR = 3.831; 95%CI = 1.068-13.742), -2578A/-1154A/-634C (OR = 3.356; 95%CI = 1.198-9.400), and -2578A/-634C/936C (OR = 10.820; 95%CI = 2.811-41.656) haplotypes were also significantly higher in patients than in controls. We conclude that the combined genotype VEGF -2578CA+AA/-634CC is a possible risk factor for IVD degeneration and the VEGF -2578A/-1154A/-634C/936C haplotype may increase the risk for development of IVD degeneration. Furthermore, the VEGF -634C allele appears to be associated with susceptibility to IVD degeneration.
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Affiliation(s)
- I B Han
- Department of Neurosurgery, CHA Bundang Medical Center, CHA University, Seongnam/Graduate School of Medicine, Yonsei University, Seoul, South Korea
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Kim KN, Woo DM, Park H. The sintering characteristics of fly ash-clay system with mine tailing. Journal of the Korean Crystal Growth and Crystal Technology 2011. [DOI: 10.6111/jkcgct.2011.21.6.259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Kim HJ, Oh JS, An SS, Pennant WA, Gwak SJ, Kim AN, Han PK, Yoon DH, Kim KN, Ha Y. Hypoxia-specific GM-CSF-overexpressing neural stem cells improve graft survival and functional recovery in spinal cord injury. Gene Ther 2011; 19:513-21. [DOI: 10.1038/gt.2011.137] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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22
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Kim KN, Jung HS, Park H. Preparation of shotcrete coarse aggregate with low grade clay and coal ash. Journal of the Korean Crystal Growth and Crystal Technology 2010. [DOI: 10.6111/jkcgct.2010.20.3.147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cheong YH, Sung SJ, Kim BG, Pandey GK, Cho JS, Kim KN, Luan S. Constitutive overexpression of the calcium sensor CBL5 confers osmotic or drought stress tolerance in Arabidopsis. Mol Cells 2010; 29:159-65. [PMID: 20077023 DOI: 10.1007/s10059-010-0025-z] [Citation(s) in RCA: 53] [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] [Received: 08/31/2009] [Revised: 10/30/2009] [Accepted: 11/02/2009] [Indexed: 10/20/2022] Open
Abstract
Calcium serves as a critical messenger in many adaptation and developmental processes. Cellular calcium signals are detected and transmitted by sensor molecules such as calcium-binding proteins. In plants, the calcineurin B-like protein (CBL) family represents a unique group of calcium sensors and plays a key role in decoding calcium transients by specifically interacting with and regulating a family of CBL-interacting protein kinases (CIPKs). In this study, we report the role of Arabidopsis CBL5 gene in high salt or drought tolerance. CBL5 gene is expressed significantly in green tissues, but not in roots. CBL5 was not induced by abiotic stress conditions such as high salt, drought or low temperature. To determine whether the CBL5 gene plays a role in stress response pathways, we ectopically expressed the CBL5 protein in transgenic Arabidopsis plants (35S-CBL5) and examined plant responses to abiotic stresses. CBL5-overexpressing plants displayed enhanced tolerance to high salt or drought stress. CBL5 overexpression also rendered plants more resistant to high salt or hyperosmotic stress during early development (i.e., seed germination) but did not alter their response to abiscisic acid (ABA). Furthermore, overexpression of CBL5 alters the gene expression of stress gene markers, such as RD29A, RD29B and Kin1 etc. These results suggest that CBL5 may function as a positive regulator of salt or drought responses in plants.
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Affiliation(s)
- Yong Hwa Cheong
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.
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Han IB, Kim SH, Kim KN, Ahn JY. Simultaneous unilateral internal carotid artery and occlusive basilar artery dissections. Br J Neurosurg 2010; 24:211-3. [PMID: 20121537 DOI: 10.3109/02688690903506119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We report a case of brain stem infarction. The case is interesting for simultaneous occurrence of basilar artery (BA) occlusion caused by BA dissection and left internal carotid artery (ICA) dissection after a minor cervical trauma. Stents were implanted at the ICA dissection, and BA occlusion was treated conservatively.
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Affiliation(s)
- I B Han
- Department of Neurosurgery, Bundang CHA Hospital, CHA University, Sungnam, Korea.
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You HS, Choi KS, Bae PK, Kim KN, Jang HG, Kim YR, Kim CH. Preparation and Characterization of Various Surface-modified Semiconductor Nanocrystals. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.12.3137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Oh SI, Park J, Yoon S, Kim Y, Park S, Ryu M, Nam MJ, Ok SH, Kim JK, Shin JS, Kim KN. The Arabidopsis calcium sensor calcineurin B-like 3 inhibits the 5'-methylthioadenosine nucleosidase in a calcium-dependent manner. Plant Physiol 2008; 148:1883-96. [PMID: 18945934 PMCID: PMC2593668 DOI: 10.1104/pp.108.130419] [Citation(s) in RCA: 16] [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] [Subscribe] [Scholar Register] [Received: 09/26/2008] [Accepted: 10/16/2008] [Indexed: 05/17/2023]
Abstract
Calcineurin B-like (CBL) proteins represent a unique family of calcium sensors in plant cells. Sensing the calcium signals elicited by a variety of abiotic stresses, CBLs transmit the information to a group of serine/threonine protein kinases (CBL-interacting protein kinases [CIPKs]), which are currently known as the sole targets of the CBL family. Here, we report that the CBL3 member of this family has a novel interaction partner in addition to the CIPK proteins. Extensive yeast two-hybrid screenings with CBL3 as bait identified an interesting Arabidopsis (Arabidopsis thaliana) cDNA clone (named AtMTAN, for 5'-methylthioadenosine nucleosidase), which encodes a polypeptide similar to EcMTAN from Escherichia coli. Deletion analyses showed that CBL3 utilizes the different structural modules to interact with its distinct target proteins, CIPKs and AtMTAN. In vitro and in vivo analyses verified that CBL3 and AtMTAN physically associate only in the presence of Ca(2+). In addition, we empirically demonstrated that the AtMTAN protein indeed possesses the MTAN activity, which can be inhibited specifically by Ca(2+)-bound CBL3. Overall, these findings suggest that the CBL family members can relay the calcium signals in more diverse ways than previously thought. We also discuss a possible mechanism by which the CBL3-mediated calcium signaling regulates the biosynthesis of ethylene and polyamines, which are involved in plant growth and development as well as various stress responses.
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Affiliation(s)
- Seung-Ick Oh
- Department of Molecular Biology, Sejong University, Seoul 143-747, Korea
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Kim KN, Kang JH, Yim SV, Park CS. Role of Caveolin-1 in Indomethacin-induced Death of Human Hepatoadenocarcinoma SK-Hep1 Cells. Korean J Physiol Pharmacol 2008; 12:143-8. [PMID: 19967048 DOI: 10.4196/kjpp.2008.12.4.143] [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] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Caveolin-1 (CAV1) is an integral membrane protein that may function as a scaffold for plasma membrane proteins and acts as a tumor suppressor protein. One causative factor of chemotherapy-resistant cancers is P-plycoprotein (P-gp), the product of the multidrug resistance-1 gene (MDR1), which is localized in the caveolar structure. Currently, the interactive roles of CAV1 and MDR1 expression in the death of cancer cells remain controversial. In this study, we investigated the effects of indomethacin on the cell viability and the expression levels of MDR1 mRNA and protein in a CAV1-siRNA-mediated gene knockdown hepatoma cell line (SK-Hep1). Cell viability was significantly decreased in CAV1-siRNA-transfected cells compared with that of control-siRNA-transfected cells. Furthermore, the viability of cells pretreated with CAV1 siRNA was markedly decreased by treatment with indomethacin (400microM for 24 h). However, the protein and mRNA levels of MDR1 were unchanged in CAV1-siRNA-transfected cells. These results suggest that CAV1 plays an important role as a major survival enzyme in cancer cells, and indomethacin can sensitively induce cell death under conditions of reduced CAV1 expression, independent of MDR1 expression.
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Affiliation(s)
- Kyung-Nam Kim
- Department of Clinical Pharmacology, College of Medicine, Kyung Hee University, Seoul 130-701, Korea
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Abstract
Vertebroplasty using polymethylmethacrylate (PMMA) for augmentation is accepted as a safe and effective treatment for vertebral compression fracture. However, various complications related to PMMA vertebroplasty have recently been reported. We experienced three cases with progressive collapse of PMMA-augmented vertebra. Collapse progressed after augmentation in cases where PMMA conglomerated without contiguous bone interdigitation. A high viscosity of the PMMA preparation and vertebral body cavitory lesion may play a role in progressive vertebral collapse. To avoid this complication, bone cement should be injected sufficiently and permeate to contiguous bone to create strong support and anchorage.
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Affiliation(s)
- D A Shin
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
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Shin DA, Kim SH, Kim KN, Shin HC, Yoon DH. Surgical management of spinal cord haemangioblastoma. Acta Neurochir (Wien) 2008; 150:215-20; discussion 220. [PMID: 18253694 DOI: 10.1007/s00701-008-1396-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Accepted: 09/11/2007] [Indexed: 11/29/2022]
Abstract
BACKGROUND The surgical management of spinal cord haemangioblastomas is distinct from that of other benign spinal cord tumours and optimal surgical strategy is still being determined because of the rarity of the condition. The aim of this study is to investigate factors that affect the outcome of surgical management. PATIENTS AND METHODS We retrospectively analysed 24 operations for symptomatic spinal cord haemangioblastomas in 20 patients. Clinical features and surgical results were investigated by medical record review, telephone interviews, angiographic images, and magnetic resonance images (MRI). The mean follow-up period was 5.6 years (range 6 months to 13.6 years). RESULTS Patients with cystic components showed pre-operative motor weakness and sensory change more commonly than those without cystic components. Post-operative function scale had a positive correlation with pre-operative function (R(2) = 0.727; p < 0.001) and no correlation with the extent of the surgery. All subtotally removed tumours recurred, whereas totally removed tumours recurred in only 3 patients. CONCLUSION The cystic component of spinal cord haemangioblastomas is responsible for symptom generation and is helpful for dissecting tumours. Post-operative functional status is determined by pre-operative functional status. Total removal is feasible by using the correct surgical technique and is recommended to prevent recurrence.
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Affiliation(s)
- D A Shin
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Republic of Korea
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Son CH, Kim HI, Kim KN, Lee KN, Lee CU, Roh MS, Kim KH, Yang DK, Lee SK. Moxifloxacin-associated drug hypersensitivity syndrome with drug-induced hypersensitivity pneumonitis. J Investig Allergol Clin Immunol 2008; 18:72-73. [PMID: 18361108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Affiliation(s)
- C H Son
- Department of Internal Medicine, College of Medicine, Dong-A University, Busan, Korea
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Yi S, Kim SH, Shin HC, Kim KN, Yoon DH. Outcome of surgery for a symptomatic herniated thoracic disc in relation to preoperative characteristics of the disc. Acta Neurochir (Wien) 2007; 149:1139-45; discussion 1145. [PMID: 17876496 DOI: 10.1007/s00701-007-1287-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Accepted: 05/14/2007] [Indexed: 11/26/2022]
Abstract
BACKGROUND This report presents general information on herniated thoracic discs, their clinical manifestations as well as surgical treatment, and examines the differences in the surgical outcome based on disc characteristics. METHODS This study includes 33 thoracic discectomies in 29 patients with a ventrally situated herniated thoracic disc reaching to the thoracic cord. Using preoperative computed tomography scanning and magnetic resonance imaging, the direction of the disc was classified as either central or lateral, and disc consistency classified as either soft or hard. Clinical outcome was assessed according to the Japanese Orthopedic Association (JOA) Score for thoracic myelopathy. The score was obtained by analysing motor, sensory and bladder function. Recovery rate was assessed, comparing preoperative and postoperative status based on disc characteristics. The correlations between outcome, symptom duration and recovery rate were also investigated. FINDINGS Clinical outcome according to the JOA Score showed significant postoperative improvement, increasing from 7.0 +/- 3.1 points to 8.2 +/- 2.7 points postoperatively (p < 0.01). The mean recovery rate was 12.4 +/- 56.9%, and 16 patients (55.2%) showed improvement. In the soft disc group, there was improvement in all categories, but the hard disc group showed no improvement. The central disc group showed improvement in sensory function, but the lateral disc group showed little improvement. Regression analysis revealed a statistically significant correlation between the preoperative and postoperative score, symptom duration and recovery rate. CONCLUSIONS Clinical outcome after surgery of a herniated thoracic disc proved successful, especially when the disc was considered to have a soft consistency. In order to decide the optimal surgical strategy and prospective surgical outcome, disc characteristics, including consistency and direction of prolapse should be considered preoperatively.
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Affiliation(s)
- S Yi
- Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, Korea
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Kwak MS, Min SR, Lee SM, Kim KN, Liu JR, Paek KH, Shin JS, Bae JM. A sepal-expressed ADP-glucose pyrophosphorylase gene (NtAGP) is required for petal expansion growth in 'Xanthi' tobacco. Plant Physiol 2007; 145:277-89. [PMID: 17660352 PMCID: PMC1976561 DOI: 10.1104/pp.107.102095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Accepted: 07/16/2007] [Indexed: 05/16/2023]
Abstract
In this study, a tobacco (Nicotiana tabacum 'Xanthi') ADP-glucose pyrophosphorylase cDNA (NtAGP) was isolated from a flower bud cDNA library and the role of NtAGP in the growth of the floral organ was characterized. The expression of NtAGP was high in the sepal, moderate in the carpel and stamen, and low in the petal tissues. NtAGP-antisense plants produced flowers with abnormal petal limbs due to the early termination of the expansion growth of the petal limbs between the corolla lobes. Microscopic observation of the limb region revealed that cell expansion was limited in NtAGP-antisense plants but that cell numbers remained unchanged. mRNA levels of NtAGP, ADP-glucose pyrophosphorylase activity, and starch content in the sepal tissues of NtAGP-antisense plants were reduced, resulting in significantly lower levels of sugars (sucrose, glucose, and fructose) in the petal limbs. The feeding of these sugars to flower buds of the NtAGP-antisense plants restored the expansion growth in the limb area between the corolla lobes. Expansion growth of the petal limb between the corolla lobes was severely arrested in 'Xanthi' flowers from which sepals were removed, indicating that sepal carbohydrates are essential for petal limb expansion growth. These results demonstrate that NtAGP plays a crucial role in the morphogenesis of petal limbs in 'Xanthi' through the synthesis of starch, which is the main carbohydrate source for expansion growth of petal limbs, in sepal tissues.
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Affiliation(s)
- Man Sup Kwak
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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Yi S, Kim SH, Shin HC, Kim KN, Yoon DH. Cervical arthroplasty in a patient with Klippel-Feil syndrome. Acta Neurochir (Wien) 2007; 149:805-9; discussion 809. [PMID: 17616843 DOI: 10.1007/s00701-007-1115-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2006] [Accepted: 01/15/2007] [Indexed: 10/23/2022]
Abstract
This is the first published report of a patient with Klippel-Feil syndrome treated with cervical arthroplasty. A 36-year-old man presented with posterior neck pain and myelopathic symptoms. A radiograph demonstrated congenital fusion of the vertebral bodies at C2-3, C4-5 and C5-6. On MRI, the spinal cord was compressed by a protruding cervical disc and bony spurs at C6-7. After anterior discectomy and decompression of the spinal cord at the C6-7 level, the disc was replaced with the Bryan cervical disc system (Medtronic Sofamor Danek, Memphis, TN, USA) to restore normal motion. The absence of adjacent segment degeneration and the preservation of cervical motion were noted 2 years after surgery. Arthroplasty may be performed in selected patients with Klippel-Feil syndrome in order to restore motion and to prevent degeneration of the adjacent segment by reducing hypermobility.
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Affiliation(s)
- S Yi
- Department of Neurosurgery, Nanoori Hospital, Seoul, Korea
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Kang HJ, Heo DH, Choi SW, Kim KN, Shim J, Kim CW, Sung HC, Yun CW. Functional characterization of Hsp33 protein from Bacillus psychrosaccharolyticus; additional function of HSP33 on resistance to solvent stress. Biochem Biophys Res Commun 2007; 358:743-50. [PMID: 17512907 DOI: 10.1016/j.bbrc.2007.04.184] [Citation(s) in RCA: 25] [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] [Received: 04/24/2007] [Accepted: 04/26/2007] [Indexed: 11/15/2022]
Abstract
Psychrophiles have been known as efficient organism to degrade organic solvent. To investigate the mechanism of solvent stress and identify the factors that affect the solvent stress in psychrophiles, we selected Bacillus psychrosaccharolyticus one of the psychrophiles and two-dimensional gel electrophoresis was performed. Among the protein spots analyzed by 2-DE, five spots induced in 3% IPA stress conditions were identified by MS/MS, and one of these spots was identified as a Hsp33 family. The Hsp33 protein sequence of B. psychrosaccharolyticus exhibited a high similarity with the corresponding proteins of other bacteria. The Hsp33 protein of B. psychrosaccharolyticus has a highly conserved zinc-binding domain (CXCX, CXXC) that includes four cysteine residues in the C-terminus. In addition, the transcriptional induction of the HSP33 of B. psychrosaccharolyticus was confirmed by Northern blot analysis, and formation of free thiol linkage was induced under stress conditions such as exposure to solvents, heat-shock, and oxidative stress. Furthermore, over-expressed strains of HSP33 of B. psychrosaccharolyticus in Escherichia coli improved stress tolerance to the organic solvent when compared with the wild-type. These data suggest that the solvent stress condition was similar to heat-shock or oxidative stress, especially through the triggering of induction and activation of a redox-regulatory chaperone, Hsp33, and Hsp33 plays a critical role in the tolerance to stress.
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Affiliation(s)
- Hyun-Jun Kang
- School of Life Sciences and Biotechnology, Korea University, Anam-dong, Sungbuk-gu, Seoul, Republic of Korea
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Abstract
We tested the ability of Taq DNA polymerase (Taq) to amplify long DNA fragments and showed that, if the conditions were set properly, Taq could successfully perform the "long PCR" up to 24 kb. The conditions include: (1) longer primers, (2) a 2-step cycling, and (3) a "long buffer." We propose that the most important requirements are the survival rate of Taq at high temperatures and that of the primers against the 5' to 3' exonuclease activity of Taq.
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Affiliation(s)
- Hayan Lee
- Department of Chemistry, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul, Korea
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Jayasekaran K, Kim KN, Vivekanandan M, Shin JS, Ok SH. Novel calcium-binding GTPase (AtCBG) involved in ABA-mediated salt stress signaling in Arabidopsis. Plant Cell Rep 2006; 25:1255-62. [PMID: 16832621 DOI: 10.1007/s00299-006-0195-5] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 04/09/2006] [Revised: 05/30/2006] [Accepted: 06/09/2006] [Indexed: 05/10/2023]
Abstract
We have identified a novel Ca(2+)-signal sensing GTPase (643 amino acid residues with an estimated molecular mass of 79 kDa) from the Arabidopsis genome database. This protein contains a RHO-like GTPase domain at the N-terminus (15-184 amino acids) and two calcium-binding EF-hand motifs (199-227 and 319-347 amino acids, respectively). It has the capability to bind calcium and hydrolyze GTP; in addition, its GTPase activity is regulated by changes in Ca(2+) concentration. The expression of this gene was induced by ABA and salt stresses, and specific knock-out mutants were highly sensitive to ABA and salt treatments. These findings suggest that this protein is a novel ABA- and salt stress-related Ca(2+) signal transducer.
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Yoon DH, Yi S, Shin HC, Kim KN, Kim SH. Clinical and radiological results following cervical arthroplasty. Acta Neurochir (Wien) 2006; 148:943-50. [PMID: 16791434 DOI: 10.1007/s00701-006-0805-6] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2006] [Accepted: 04/25/2006] [Indexed: 10/24/2022]
Abstract
BACKGROUND This was a retrospective study of clinical and radiological results of cervical arthroplasty using the Bryan cervical disc prosthesis to evaluate the efficacy of arthroplasty in clinical applications. METHODS A total of 46 patients underwent arthroplasty of a single level using the Bryan disc prosthesis. Clinical outcome was assessed using the visual analogue scale (VAS) and the neck disability index (NDI). All patients were evaluated using preoperative and postoperative static cervical spine radiographs to compare cervical sagittal balance. Dynamic cervical spine radiographs were used to compare movement at the level of the procedure, movement at the adjacent level and movement of the whole cervical spine. FINDINGS With the exception of four patients with aggravated neck pain, the NDI and VAS scores decreased significantly in late follow-up evaluations. The range of movement of the whole cervical spine, the functional segmental unit, and the adjacent segments were preserved after arthroplasty. The sagittal alignment of the cervical spine showed kyphosis after surgery but restored lordosis at a later time. The postulated cause of kyphotic changes include "over-milling" at the dorsal endplate, inappropriate angle of disc insertion, structural absence of lordosis in the Bryan disc, removal of posterior longitudinal ligament, and pre-existing kyphosis. CONCLUSIONS Arthroplasty using the Bryan disc appears to be safe and provided a favorable preliminary clinical and radiological outcome. Postoperative kyphosis can be prevented by understanding the biomechanical properties of the Bryan disc. Future studies will need to address the association between postoperative kyphosis, clinical outcome and adjacent segment disease.
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Affiliation(s)
- D H Yoon
- Department of Neurosurgery, Yonsei University, College of Medicine, Seoul, Korea
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Park EY, Oh SI, Nam MJ, Shin JS, Kim KN, Song HK. Crystal structure of 5′-methylthioadenosine nucleosidase from Arabidopsis thaliana at 1.5-Å resolution. Proteins 2006; 65:519-23. [PMID: 16909418 DOI: 10.1002/prot.21120] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Eun Young Park
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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Kim KN, Oh SH, Lee KH, Yoon DH. Effect of human mesenchymal stem cell transplantation combined with growth factor infusion in the repair of injured spinal cord. Acta Neurochir Suppl 2006; 99:133-6. [PMID: 17370779 DOI: 10.1007/978-3-211-35205-2_25] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Recently, bone marrow stromal cells have been shown to have the capacity to differentiate into neural cell under experimental cell culture conditions. Some investigators suppose that these cells, when placed into an environment of injury, express factors that promote repair or active compensatory mechanisms and endogeneous stem cells within the injured tissue. Rats were subjected to a weight driven implant spinal cord injury. After one week, the rats were treated with cultured human mesenchymal stem cells (MSCs) transplantation and basic fibroblast growth factor (bFGF) infusion into the CSF space. Functional outcome and histologic evaluation were performed. The data showed improved functional outcome in the group treated with MSCs transplantation and bFGF administration compared with the group of MSCs transplantation and control, which means bFGF might take an additional role to improve functional outcome. Glial differentiation of MSCs was noted but neuronal differentiation was doubtful. In this study, we did not demonstrate the mechanism of the neurotrophic factor affecting neural repair. However, this study is consistent with growing literature that MSCs and neurotrophic factor promote tissue repair and functional recovery after spinal cord injury and suggests that MSCs transplantation and bFGF warrants investigation as a therapeutic intervention after spinal cord injury.
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Affiliation(s)
- K N Kim
- Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea
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Kwak MS, Noh SA, Oh MJ, Huh GH, Kim KN, Lee SW, Shin JS, Bae JM. Two sweetpotato ADP-glucose pyrophosphorylase isoforms are regulated antagonistically in response to sucrose content in storage roots. Gene 2005; 366:87-96. [PMID: 16338103 DOI: 10.1016/j.gene.2005.09.021] [Citation(s) in RCA: 18] [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] [Received: 06/03/2005] [Revised: 08/24/2005] [Accepted: 09/02/2005] [Indexed: 11/19/2022]
Abstract
The transcriptional regulation of ADP-glucose pyrophosphorylase (AGPase) genes in detached leaves in response to exogenous sucrose has been investigated earlier; however the effects of endogenous sucrose on AGPase gene transcription in leaves or starch-accumulating tissues have not yet been determined. We therefore have investigated the relationship between endogenous sucrose content in the storage tissues of sweetpotato (Ipomoea batatas cv. Yulmi) and the rate of transcription of the two sweetpotato AGPase isoforms, ibAGP1 and ibAGP2, by means of transient expression analysis of their promoters. Sequence analysis of the two promoters identified putative sucrose-responsive elements on the ibAGP1 promoter and, conversely, putative sucrose-starvation elements on the ibAGP2 promoter. Transient expression analyses on transverse storage root sections revealed that the ibAGP1 and ibAGP2 promoters directed strong expression in the sweetpotato storage roots (diameter: 1.5 cm). Sucrose contents of the sweetpotato storage roots were positively correlated with growth of the storage root. In the storage roots, ibAGP1 promoter activity became stronger with increasing endogenous sucrose levels, while ibAGP2 promoter activity became markedly weaker. Consequently, ibAGP2 was expressed primarily during the early stages of storage root development, whereas ibAGP1 was abundantly expressed in the later stages, during which a profound level of starch accumulation occurs. The antagonistic regulation of the two promoters in response to endogenous sucrose levels was also confirmed in carrot (Daucus carota L. cv. Hapa-ochon) taproots.
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Affiliation(s)
- Man Sup Kwak
- School of Life Sciences and Biotechnology, Korea University, Seoul, 136-701, South Korea
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Ok SH, Jeong HJ, Bae JM, Shin JS, Luan S, Kim KN. Novel CIPK1-associated proteins in Arabidopsis contain an evolutionarily conserved C-terminal region that mediates nuclear localization. Plant Physiol 2005; 139:138-50. [PMID: 16113215 PMCID: PMC1203364 DOI: 10.1104/pp.105.065649] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2005] [Revised: 06/12/2005] [Accepted: 06/29/2005] [Indexed: 05/04/2023]
Abstract
Environmental stimuli, including light, pathogens, hormones, and abiotic stresses, elicit changes in the cytosolic Ca(2+) signatures of plant cells. However, little is known about the molecular mechanisms by which plants sense and transmit the specific cytoplasmic Ca(2+) signal into the nucleus, where gene regulation occurs to respond appropriately to the stress. In this study, we have identified two novel Arabidopsis (Arabidopsis thaliana) proteins specifically associated with Calcineurin B-Like-Interacting Protein Kinase1 (CIPK1), a member of Ser/Thr protein kinases that interact with the calcineurin B-like Ca(2+)-binding proteins. These two proteins contain a very similar C-terminal region (180 amino acids in length, 81% similarity), which is required and sufficient for both interaction with CIPK1 and translocation to the nucleus. Interestingly, the conserved C-terminal region was also found in many proteins from various eukaryotic organisms, including humans. However, none of them have been characterized so far. Taken together, these findings suggest that the two proteins containing the evolutionarily conserved C-terminal region (ECT1 and ECT2) may play a critical role in relaying the cytosolic Ca(2+) signals to the nucleus, thereby regulating gene expression.
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Affiliation(s)
- Sung Han Ok
- Department of Molecular Biology, Sejong University, Seoul, Korea
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Kim JM, Kim KN, Park JK, Kim CH, Jang HG. Synthesis and Luminescence Characteristics of SrS:Eu2+Red Phosphor. Journal of the Korean Chemical Society 2005. [DOI: 10.5012/jkcs.2005.49.2.138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kim JM, Kim KN, Park SH, Park JK, Kim CH, Jang HG. Synthesis and Luminescent Characteristics of CaGa2S4:Eu2+Yellow Phosphor for Light Emitting Diode. Journal of the Korean Chemical Society 2005. [DOI: 10.5012/jkcs.2005.49.2.201] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Choi ID, Ha GS, Kim KN, Choi YJ. Cloning and characterization of the catabolite control protein A gene from Bacillus stearothermophilus No. 236. Biosci Biotechnol Biochem 2005; 68:1414-23. [PMID: 15277745 DOI: 10.1271/bbb.68.1414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The gene encoding the catabolite control protein A (CcpA) of Bacillus stearothermophilus No. 236, a strong xylanolytic bacterium, was cloned, sequenced, and expressed in Escherichia coli. The nucleotide sequence of the ccpA gene corresponded to an open reading frame of 1,005 bp that encodes a polypeptide of 334 amino acid residues with a calculated molecular mass of 36,902 kDa. The CcpA protein belonging to the LacI/GalR family of transcriptional regulators was produced by a recombinant E. coli strain expressing the B. stearothermophilus No. 236 ccpA gene and purified to apparent homogeneity. The transcription start site was mapped at a position 63 nucleotides upstream of the translation initiation codon, and a presumed promoter sequence was also identified. The deduced amino acid sequence of the ccpA gene product contained the helix-turn-helix motif found in many DNA-binding proteins, and showed the highest identity (62%) with CcpA from B. subtilis. The B. stearothermophilus No. 236 ccpA gene was demonstrated to be able to complement a B. subtilis ccpA mutant that exhibited two distinct mutant phenotypes: a growth defect and a release of carbon catabolite repression (CCR). These results indicate that the ccpA gene product of B. stearothermophilus No. 236 is functionally active also in B. subtilis. Electrophoretic mobility shift assay with the purified CcpA revealed that the CcpA of B. stearothermophilus No. 236 bound specifically to the xynA creB (catabolite responsive element B) sequence. Taken together, these results strongly suggest that the CcpA protein participates in CCR of B. stearothermophilus No. 236 xynA gene.
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Affiliation(s)
- Il-Dong Choi
- Graduate School of Life Science and Biotechnology, Korea University, Seoul 136-701, Korea.
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Lee JH, Kim KN, Choi YJ. Identification and characterization of a novel inulin binding module (IBM) from the CFTase of Bacillus macerans CFC1. FEMS Microbiol Lett 2004; 234:105-10. [PMID: 15109727 DOI: 10.1016/j.femsle.2004.03.013] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2004] [Revised: 03/08/2004] [Accepted: 03/08/2004] [Indexed: 11/23/2022] Open
Abstract
A novel inulin-binding module (IBM), which was identified from the N-terminal region of the cycloinulinooligosaccharide fructanotransferase (CFTase) in Bacillus macerans CFC1, was characterized using the discrete entity of IBM produced by the recombinant Escherichia coli strains. Deletion analyses located the inulin binding activity in the N-terminal region between 241 and 389 amino acid residues, which was removed from the mature enzyme by processing when secreted from the B. macerans CFC1 cells. IBM bound specifically to polyfructans such as inulin and levan but it did not interact with any of the glycan polymers tested in this study including cellulose, xylan, and starch. Binding studies on the IBM revealed that the equilibrium dissociation constant K(d) and the maximum amount of protein bound [(PC)(max)] were 4.7 microM and 22 microM g(-1), respectively. Together, these results indicate that the IBM of CFTase has a relatively high and specific affinity for inulin. Adsorption of the IBM to inulin was highest at pH 7.0 and lowered slowly with decreasing pH down to 3.0. At pH 7.0, the binding activity was enhanced about twofold by the presence of 1 M MgCl(2). Chemical modification experiments with the aromatic amino acid-specific modifiers implied that tryptophan and tyrosine residues in the IBM are likely to participate in the interaction with the inulin molecules.
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Affiliation(s)
- Ji-Hyun Lee
- Graduate School of Life Science and Biotechnology, Korea University, Seoul 136-701, Republic of South Korea
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Kim JM, Kim KN, Park JK, Kim CH, Jang HG. Synthesis and Luminescence Characteristics of SrGa2S4:Eu Green Phosphor for Light Emitting Diodes by Solid-State Method. Journal of the Korean Chemical Society 2004. [DOI: 10.5012/jkcs.2004.48.4.371] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Song M, Kim MJ, Park YS, Lee EO, Hah YS, Han KJ, Ryu SA, Kang HY, Kim KN, Cho MS. [Comparison of nursing activities reflected in nursing notes and in-depth interviews of nurses in an acute hospital]. ACTA ACUST UNITED AC 2004; 33:802-11. [PMID: 15314398 DOI: 10.4040/jkan.2003.33.6.802] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
PURPOSE The purpose of this study was to compare the nursing activities delineated by interview of nurses with those on nursing notes. METHOD The participants of interview were 18 nurses working in medical and surgical units of a large hospital in Seoul. Each nurse was asked to choose one patient who demand most nursing care among her patients. The nurse was then interviewed to describe what her nursing activities for the patient was that day. The audio-taped interview was transcribed and the content was analyzed by researchers. Nursing notes of each nurses' patients were copied and the content analyzed by researchers. Finally, themes from the interview data and those from nursing notes were compared. RESULT Activities related to emotional or psychological nursing, education for patient and families, and problem solving related to treatment or nursing procedure were most often omitted in nursing notes. Most of the documentation in nursing notes were related to physical condition of patients or physician's orders. Nurses described that they will do better recording if they were given less patient care responsibility, had better nursing knowledge, had better recording system, and received more training on nursing record. CONCLUSION Nursing notes did not reflect nursing activities properly. Few independent nursing roles were documented in the nursing notes. Development of nursing education program and nursing record system is needed for improvement of nursing record.
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Affiliation(s)
- Misoon Song
- College of Nursing, Seoul National University, Korea.
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Kim JY, Ok SH, Kandakumar J, Park HM, Kim YY, Kim KN, Shin JS. WITHDRAWN: A novel calmodulin-interacting protein (CUGT1) is rapidly induced by stress signals in Arabidopsis. Planta 2004. [PMID: 15257459 DOI: 10.1007/s00425-004-1315-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The manuscript has been withdrawn on request of the authors and will not be published in that version in the print edition of Planta.
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Affiliation(s)
- Ji-Young Kim
- Laboratory of Plant Molecular Genetics, School of Life Sciences and Biotechnology, Korea University, 136-701, Seoul, Korea
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Pandey GK, Cheong YH, Kim KN, Grant JJ, Li L, Hung W, D'Angelo C, Weinl S, Kudla J, Luan S. The calcium sensor calcineurin B-like 9 modulates abscisic acid sensitivity and biosynthesis in Arabidopsis. Plant Cell 2004; 16:1912-24. [PMID: 15208400 PMCID: PMC514170 DOI: 10.1105/tpc.021311] [Citation(s) in RCA: 213] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2004] [Accepted: 04/21/2004] [Indexed: 05/17/2023]
Abstract
Calcium plays a pivotal role in plant responses to several stimuli, including pathogens, abiotic stresses, and hormones. However, the molecular mechanisms underlying calcium functions are poorly understood. It is hypothesized that calcium serves as second messenger and, in many cases, requires intracellular protein sensors to transduce the signal further downstream in the pathways. The calcineurin B-like proteins (CBLs) represent a unique family of calcium sensors in plant cells. Here, we report our analysis of the CBL9 member of this gene family. Expression of CBL9 was inducible by multiple stress signals and abscisic acid (ABA) in young seedlings. When CBL9 gene function was disrupted in Arabidopsis thaliana plants, the responses to ABA were drastically altered. The mutant plants became hypersensitive to ABA in the early developmental stages, including seed germination and post-germination seedling growth. In addition, seed germination in the mutant also showed increased sensitivity to inhibition by osmotic stress conditions produced by high concentrations of salt and mannitol. Further analyses indicated that increased stress sensitivity in the mutant may be a result of both ABA hypersensitivity and increased accumulation of ABA under the stress conditions. The cbl9 mutant plants showed enhanced expression of genes involved in ABA signaling, such as ABA-INSENSITIVE 4 and 5. This study has identified a calcium sensor as a common element in the ABA signaling and stress-induced ABA biosynthesis pathways.
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Affiliation(s)
- Girdhar K Pandey
- Department of Plant and Microbial Biology, University of California, Berkeley 94720, USA
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Lee JH, Kim KN, Choi YJ. Identification and characterization of a novel inulin binding module (IBM) from the CFTase ofBacillus maceransCFC1. FEMS Microbiol Lett 2004. [DOI: 10.1111/j.1574-6968.2004.tb09520.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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