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Ishida H, Yamaguchi M, Saito SY, Furukawa T, Shannonhouse JL, Kim YS, Ishikawa T. Corrigendum to "Na(+)-dependent inactivation of vascular Na(+)/Ca(2+) exchanger responsible for reduced peripheral blood flow in neuropathic pain model" [Eur. J. Pharmacol. 910 (2021) 174448]. Eur J Pharmacol 2024; 970:176495. [PMID: 38490839 DOI: 10.1016/j.ejphar.2024.176495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Affiliation(s)
- H Ishida
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuka, 52-1 Yada, Suruga Ward, Shizuoka City, Shizuoka, 422-8526, Japan; Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229, USA
| | - M Yamaguchi
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuka, 52-1 Yada, Suruga Ward, Shizuoka City, Shizuoka, 422-8526, Japan
| | - S Y Saito
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuka, 52-1 Yada, Suruga Ward, Shizuoka City, Shizuoka, 422-8526, Japan; Faculty of Veterinary Medicine, Okayama University of Science, 1-3 Ikoinooka, Imabari City, Ehime, 794-8555, Japan
| | - T Furukawa
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuka, 52-1 Yada, Suruga Ward, Shizuoka City, Shizuoka, 422-8526, Japan
| | - J L Shannonhouse
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229, USA
| | - Y S Kim
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229, USA; Programs in Integrated Biomedical Sciences & Translational Sciences, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229, USA
| | - T Ishikawa
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuka, 52-1 Yada, Suruga Ward, Shizuoka City, Shizuoka, 422-8526, Japan.
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Park S, Bae S, Kim EO, Chang E, Kim MJ, Chong YP, Choi SH, Lee SO, Kim YS, Jung J, Kim SH. The impact of discontinuing single-room isolation of patients with vancomycin-resistant enterococci: a quasi-experimental single-centre study in South Korea. J Hosp Infect 2024; 147:77-82. [PMID: 38492645 DOI: 10.1016/j.jhin.2024.02.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 03/18/2024]
Abstract
OBJECTIVES There is limited data on the effects of discontinuing single-room isolation while maintaining contact precautions, such as the use of gowns and gloves. In April 2021, our hospital ceased single-room isolation for patients with vancomycin-resistant enterococci (VRE) because of single-room unavailability. This study assessed the impact of this policy by examining the incidence of hospital-acquired VRE bloodstream infections (HA-VRE BSI). METHODS This retrospective quasi-experimental study was conducted at a tertiary-care hospital in Seoul, South Korea. Time-series analysis was used to evaluate HA-VRE BSI incidence at the hospital level and in the haematology unit before (phase 1) and after (phase 2) the policy change. RESULTS At the hospital level, HA-VRE BSI incidence level (VRE BSI per 1000 patient-days per month) and trend did not change significantly between phase 1 and phase 2 (coefficient -0.015, 95% confidence interval (CI): -0.053 to 0.023, P=0.45 and 0.000, 95% CI: -0.002 to 0.002, P=0.84, respectively). Similarly, HA-VRE BSI incidence level and trend in the haematology unit (-0.285, 95% CI: -0.618 to 0.048, P=0.09 and -0.018, 95% CI: -0.036 to 0.000, P = 0.054, respectively) did not change significantly across the two phases. CONCLUSIONS Discontinuing single-room isolation of VRE-colonized or infected patients was not associated with an increase in the incidence of VRE BSI at the hospital level or among high-risk patients in the haematology unit. Horizontal intervention for multi-drug-resistant organisms, including measures such as enhanced hand hygiene and environmental cleaning, may be more effective at preventing VRE transmission.
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Affiliation(s)
- S Park
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea
| | - S Bae
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - E O Kim
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea
| | - E Chang
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - M J Kim
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Y P Chong
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - S-H Choi
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - S-O Lee
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Y S Kim
- Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - J Jung
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea; Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
| | - S-H Kim
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea; Department of Infectious Disease, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
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Lee CM, Lee S, Kim ES, Kim HB, Park WB, Moon SM, Kim YK, Park KH, Kwak YG, Kim B, Kim YS, Kim CJ, Gil HY, Ahn J, Song KH. Disease burden of bacteraemia with extended-spectrum beta-lactamase-producing and carbapenem-resistant Enterobacterales in Korea. J Hosp Infect 2024; 144:85-93. [PMID: 38072088 DOI: 10.1016/j.jhin.2023.11.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 11/10/2023] [Accepted: 11/15/2023] [Indexed: 01/13/2024]
Abstract
BACKGROUND Despite the significant impact of multi-drug-resistant bacteraemia, especially extended-spectrum beta-lactamase-producing Enterobacterales (ESBL-E) and carbapenem-resistant Enterobacterales (CRE), the burden of disease has not been investigated thoroughly. AIM To evaluate the clinical outcomes and socio-economic burden of ESBL-E and CRE bacteraemia nationwide in the Republic of Korea. METHODS A search was undertaken for all cases of ESBL-E and CRE bacteraemia and matched controls in 10 hospitals in the Republic of Korea over 6 months. Patients with ESBL-E or CRE bacteraemia were classified as the R group, and matched controls with antibiotic-susceptible bacteraemia and without infection were classified as the S and N groups, respectively. Patients' clinical data were collected, and the economic burden was estimated based on medical expenses, loss of productivity and total costs. FINDINGS In total, 795 patients were identified, including 265 patients with ESBL-E or CRE bacteraemia and their matched controls. The mean total length of stay for patients with ESBL-E and CRE in the R group was 1.53 and 1.90 times that of patients in the S group, respectively. The 90-day mortality rates for ESBL-E in the R and S groups were 12.1% and 5.6%, respectively, and the corresponding figures for CRE were 28.6% and 12.0%. There were significant differences in the total costs between the R, S and N groups for both ESBL-E and CRE (ESBL-E: $11,151 vs $8712 vs $6063, P=0.004; CRE: $40,464 vs $8748 vs $7279, P=0.024). CONCLUSION The clinical and economic burden imposed by ESBL-E or CRE bacteraemia was extremely high. These findings suggest that efforts to control resistant bacteraemia are necessary to reduce this burden.
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Affiliation(s)
- C M Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - S Lee
- Department of Internal Medicine, Pusan National University School of Medicine and Medical Research Institute, Pusan National University Hospital, Pusan, South Korea
| | - E S Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - H B Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - W B Park
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - S M Moon
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea; Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, South Korea
| | - Y K Kim
- Department of Internal Medicine, Wonju College of Medicine, Yonsei University, Wonju, South Korea
| | - K-H Park
- Department of Infectious Diseases, Chonnam National University Medical School, Gwangju, South Korea
| | - Y G Kwak
- Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, South Korea
| | - B Kim
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, South Korea
| | - Y S Kim
- Division of Infectious Diseases, Chungnam National University School of Medicine, Daejeon, South Korea
| | - C-J Kim
- Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, South Korea
| | - H-Y Gil
- Real World Evidence Team, Pfizer Pharmaceuticals Korea Ltd, Seoul, South Korea
| | - J Ahn
- Department of Health Convergence, Ewha Womans University, Seoul, South Korea.
| | - K-H Song
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea.
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Park CB, Kang YN, Jang H, Kim YS, Choi BO, Son SH, Song JH, Choi KH, Lee YK, Sung W, Kim JL. Evaluation of Usefulness of Yeast-Based Biological Phantom and Preliminary Study for Verification of Hypoxic Effect of Flash Radiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e704. [PMID: 37786063 DOI: 10.1016/j.ijrobp.2023.06.2193] [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) As a basic hypothesis for the effectiveness of flash radiation therapy, the effect of preserving normal tissue during flash radiation is due to the instantaneous chemical depletion of oxygen. A yeast-based biological phantom was created to verify the hypoxic effect of flash radiation therapy. A study to upgrade the previously developed X-Band LINAC to a flash irradiation mode is in progress, and a preceding study is conducted to evaluate the usefulness of a yeast-based biological phantom manufactured by analyzing the change in oxygen by irradiating a high dose in a general radiation therapy device. MATERIALS/METHODS Freeze-dried yeast sample (Saccharomyces cerevisiae, S288C) is activated and sub-cultured. For mass production of yeast samples, yeast culture medium is prepared by adding yeast colonies to the ypd medium. This study was conducted to verify the hypoxic effect among the biological mechanisms that occur during flash radiation therapy at the basic stage, and the oxygen concentration change during general radiation irradiation was measured in real time using a DO (Dissolved oxygen) meter and fiber optic sensor designed to do that. To prevent scatter, which is a concern during flash irradiation, the fiber form was used, and precise experiments are possible as a non-invasive oxygen concentration measurement method. Based on 10MV of general radiation therapy device, high-dose radiation of 500-10,000 cGy is irradiated to measure real-time oxygen concentration change. RESULTS As a result of irradiation with high-dose (500-10,000 cGy) radiation of general LINAC, it was confirmed that the oxygen concentration of the yeast culture medium decreased by 5.7-63.2%, and the usefulness of the biological phantom fabricated based on the yeast culture medium was evaluated. CONCLUSION Prior to the analysis of oxygen concentration change in yeast cells during X-Band LINAC flash irradiation, a preliminary study was conducted at a high dose in a general LINAC to obtain a significant result of oxygen concentration change and confirm the usefulness of the yeast-based biological phantom. Prior research was conducted and verified as a general irradiation experiment using a yeast-based biological phantom manufactured based on a DO meter and a fiber optic oxygen sensor. After irradiation with high-dose radiation, the oxygen concentration of the yeast culture medium was measured 5 times, and it was confirmed that there was a change in oxygen concentration of 5.7-63.2%, verifying the usefulness and stability of the biological phantom. The usefulness of the yeast-based biological phantom for high doses was confirmed, and it is expected that the usefulness of the biological phantom for flash radiation can be verified by additionally measuring the change in oxygen concentration of the biological phantom according to the high dose rate in the future.
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Affiliation(s)
- C B Park
- Department of Biomedicine & Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - Y N Kang
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - H Jang
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - Y S Kim
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - B O Choi
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - S H Son
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - J H Song
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - K H Choi
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - Y K Lee
- Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - W Sung
- Department of Biomedical Engineering and Department of Biomedicine and Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Korea, Republic of (South) Korea
| | - J L Kim
- Electro-Medical Device Research Center, Korea Electrotechnology Research Institute, Ansan, Korea, Republic of (South) Korea
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Kim JY, Koo B, Lim SY, Cha HH, Kim MJ, Chong YP, Choi SH, Lee SO, Kim YS, Shin Y, Kim SH. A non-invasive, sensitive assay for active TB: combined cell-free DNA detection and FluoroSpot assays. Int J Tuberc Lung Dis 2023; 27:790-792. [PMID: 37749833 PMCID: PMC10519393 DOI: 10.5588/ijtld.23.0180] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 06/18/2023] [Indexed: 09/27/2023] Open
Affiliation(s)
- J Y Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - B Koo
- Department of Biotechnology, Yonsei University, Seoul, Republic of Korea
| | - S Y Lim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - H H Cha
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - M J Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - Y P Chong
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - S-H Choi
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - S-O Lee
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - Y S Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
| | - Y Shin
- Department of Biotechnology, Yonsei University, Seoul, Republic of Korea
| | - S-H Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul
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Song JY, Kim BH, Kang MK, Jeong JU, Kim JH, Moon SH, Suh YG, Kim JH, Kim HJ, Kim YS, Park WY, Kim HJ. Definitive Radiotherapy in Patients with Clinical T1N0M0 Esophageal Squamous Cell Carcinoma: A Multicenter Retrospective Study. Int J Radiat Oncol Biol Phys 2023; 117:e340. [PMID: 37785190 DOI: 10.1016/j.ijrobp.2023.06.2400] [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) In this study, we aimed to assess the failure pattern and survival outcomes and to analyze the optimal treatment field of definitive RT for T1N0M0 esophageal squamous cell carcinoma (ESCC). MATERIALS/METHODS We performed a retrospective analysis in a multi-institutional cohort of patients with histologically confirmed T1N0M0 ESCC. We included patients who underwent RT with definitive aim from 2010 to 2019. Patterns of failure were demonstrated as in-field locoregional, out-field locoregional and distant metastasis. In the survival analysis, freedom from locoregional recurrence and their association with clinicopathologic risk factors were analyzed. We performed a propensity score matching in the cT1b patients to adjust for the heterogeneity of radiation technique, radiation dose and the use of concurrent chemotherapy. RESULTS A total of 168 patients were included with a median follow-up of 34.0 months, and there were 20 cT1a, 94 cT1b and 24 cT1x, (cT1, not otherwise specified) patients. The rates of all and locoregional failure were 26.9% and 23.1% for cT1a and 25.0% and 22.4% for cT1b patients. 10 (10.6%) patients experienced grade ≥ 3 adverse events. Among 116 cT1b patients, 69 patients received elective nodal irradiation (ENI) and 47 patients received involved field irradiation (IFI). After propensity score matching, the 3-year FFLRR rate was 84.5% (95% Confidence Interval, 71.0 - 92.1%). There was no significant difference between the ENI and IFI patients in FFLRR (Log-rank P = 0.831). In the multivariate analysis, the use of concurrent chemotherapy was the only factor marginally associated with FFLRR (Hazard ratio, 0.17; 95% CI, 0.02 - 1.13; P = 0.067). CONCLUSION cT1a patients who cannot receive endoscopic resection, showed similar rates of failure compared with cT1b patients, which questioned the accuracy of the staging and raised the need for through treatment such as chemoradiotherapy. In cT1b patients, IFI using dose of 50 to 60 Gy with concurrent chemotherapy could be a reasonable treatment option.
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Affiliation(s)
- J Y Song
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea, Republic of (South) Korea
| | - B H Kim
- Department of Radiation Oncology, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea, Republic of (South) Korea
| | - M K Kang
- Department of Radiation Oncology, Kyungpook National University Medical Center, Daegu, Korea, Republic of (South) Korea
| | - J U Jeong
- Jeonnam National University Hwasun Hospital, Jeollanam-do, Korea, Republic of (South) Korea
| | - J H Kim
- Department of Radiation Oncology, Asan Medical Center, Seoul, Korea, Republic of (South) Korea
| | - S H Moon
- Proton Therapy Center, National Cancer Center, Goyang-si, Korea, Republic of (South) Korea
| | - Y G Suh
- Proton Therapy Center, National Cancer Center, Goyang-si, Korea, Republic of (South) Korea
| | - J H Kim
- Department of Radiation Oncology, Keimyung University Dongsan Hospital, Daegu, Korea, Republic of (South) Korea
| | - H J Kim
- Inha University Hospital, Inchon, Korea, Republic of (South) Korea
| | - Y S Kim
- Department of Radiation Oncology, Jeju National University School of Medicine, Jeju, Korea, Republic of (South) Korea
| | - W Y Park
- Chungbuk National University and Chungbuk National University Hospital, Cheongju, Korea, Republic of (South) Korea
| | - H J Kim
- Department of Radiation Oncology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea, Republic of (South) Korea
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Kim JY, Park S, Kim EO, Chang E, Bae S, Kim MJ, Chong YP, Choi SH, Lee SO, Kim YS, Jung J, Kim SH. The seasonality of carbapenemase-producing Enterobacterales in South Korea. J Hosp Infect 2023; 140:87-89. [PMID: 37506769 DOI: 10.1016/j.jhin.2023.07.010] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 07/30/2023]
Affiliation(s)
- J Y Kim
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea
| | - S Park
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea
| | - E O Kim
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea
| | - E Chang
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea
| | - S Bae
- Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - M J Kim
- Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Y P Chong
- Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - S-H Choi
- Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - S-O Lee
- Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Y S Kim
- Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - J Jung
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea; Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
| | - S-H Kim
- Office for Infection Control, Asan Medical Center, Seoul, Republic of Korea; Departments of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
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Kim YS, Baek H, Yun HS, Lee JH, Lee KI, Kim HS, Yoon HS. The Prokaryotic Microalga Limnothrix redekei KNUA012 to Improve Aldehyde Decarbonylase Expression for Use as a Biological Resource. Pol J Microbiol 2023; 72:307-317. [PMID: 37725893 PMCID: PMC10561079 DOI: 10.33073/pjm-2023-031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 07/04/2023] [Indexed: 09/21/2023] Open
Abstract
The prokaryotic microalga Limnothrix redekei KNUA012 isolated from a freshwater bloom sample from Lake Hapcheon, Hapcheon-gun, South Korea, was investigated for its potential as a biofuel feedstock. Microalgae produce straight-chain alkanes/alkenes from acyl carrier protein-linked fatty acyls via aldehyde decarbonylase (AD; EC 1.2.1.3), which can convert aldehyde intermediates into various biofuel precursors, such as alkanes and free fatty acids. In L. redekei KNUA012, long-chain ADs can convert fatty aldehyde intermediates into alkanes. After heterologous AD expression in Escherichia coli (pET28-AD), we identified an AD in L. redekei KNUA012 that can synthesize various alkanes, such as pentadecane (C15H32), 8-heptadecene (C17H34), and heptadecane (C17H36). These alkanes can be directly used as fuels without transesterification. Biodiesel constituents including dodecanoic acid (C13H26O2), tetradecanoic acid (C15H30O2), 9-hexa decenoic acid (C17H32O2), palmitoleic acid (C17H32O2), hexadecanoic acid (C17H34O2), 9-octadecenoic acid (C19H36O2), and octadecanoic acid (C19H38O2) are produced by L. redekei KNUA012 as the major fatty acids. Our findings suggest that Korean domestic L. redekei KNUA012 is a promising resource for microalgae-based biofuels and biofuel feedstock.
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Affiliation(s)
- Young-Saeng Kim
- Research Institute of Ulleung-do and Dok-do, Kyungpook National University, Daegu, Republic of Korea
| | - Haeri Baek
- Water Quality Research Institute Daegu Metropolitan City, Daegu, Republic of Korea
| | - Hyun-Sik Yun
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Jae-Hak Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Kyoung-In Lee
- Biotechnology Industrialization Center, Dongshin University, Naju, Republic of Korea
| | - Han-Soon Kim
- Research Institute of Ulleung-do and Dok-do, Kyungpook National University, Daegu, Republic of Korea
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, Republic of Korea
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Ho-Sung Yoon
- School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, Republic of Korea
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
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Yun HS, Kim DH, Kim JG, Kim YS, Yoon HS. The microbial communities (bacteria, algae, zooplankton, and fungi) improved biofloc technology including the nitrogen-related material cycle in Litopenaeus vannamei farms. Front Bioeng Biotechnol 2022; 10:883522. [PMID: 36507271 PMCID: PMC9727081 DOI: 10.3389/fbioe.2022.883522] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 11/08/2022] [Indexed: 11/24/2022] Open
Abstract
Microbes are essential in biofloc technology for controlling nitrogen levels in water. The composition and function of microorganisms with biofloc systems were reported; however, data on microorganisms other than bacteria, such as algae (which are essential in the nitrogen cycle) and zooplankton (which are bacterial and algal predators), remain limited. The microbial communities (including bacteria, algae, zooplankton, and fungi) were investigated in shrimp farms using biofloc technology. Using Illumina MiSeq sequencing, the V4 region of 18S rRNA and the V3-V4 region of 16S rRNA were utilized for the analysis of the eukaryotic and prokaryotic microbial communities. As a result, it was found that the biofloc in the shrimp farm consisted of 48.73%-73.04% eukaryotic organisms and 26.96%-51.27% prokaryotic organisms. In these shrimp farms, prokaryotic microbial communities had higher specie richness and diversity than eukaryotic microbial communities. However, the eukaryotic microbial communities were more abundant than their prokaryotic counterparts, while algae and zooplankton dominated them. It was discovered that the structures of the microbial communities in the shrimp farms seemed to depend on the effects of predation by zooplankton and other related organisms. The results provided the nitrogen cycle in biofloc systems by the algal and bacterial groups in microbial communities.
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Affiliation(s)
- Hyun-Sik Yun
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Dong-Hyun Kim
- School of Applied Biosciences, Kyungpook National University, Daegu, South Korea
| | - Jong-Guk Kim
- School of Applied Biosciences, Kyungpook National University, Daegu, South Korea,School of Life Sciences and Biotechnology, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea,*Correspondence: Jong-Guk Kim, ; Young-Saeng Kim, ; Ho-Sung Yoon,
| | - Young-Saeng Kim
- Research Institute of Ulleung-do & Dok-do, Kyungpook National University, Daegu, South Korea,*Correspondence: Jong-Guk Kim, ; Young-Saeng Kim, ; Ho-Sung Yoon,
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea,School of Life Sciences and Biotechnology, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea,Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, South Korea,*Correspondence: Jong-Guk Kim, ; Young-Saeng Kim, ; Ho-Sung Yoon,
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10
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Kim NA, Kim BG, Lee J, Chung HT, Kwon HR, Kim YS, Choi JB, Song JH. Response After Repeated Ketamine Injections in a Rat Model of Neuropathic Pain. Physiol Res 2022; 71:297-303. [PMID: 35275700 PMCID: PMC9150560 DOI: 10.33549/physiolres.934841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 01/25/2022] [Indexed: 11/25/2022] Open
Abstract
Ketamine, an N-methyl-D-aspartate antagonist, reduces pain by decreasing central sensitization and pain windup. However, chronic ketamine use can cause tolerance, dependency, impaired consciousness, urinary symptoms, and abdominal pain. This study aimed to investigate the effects of repeated ketamine injections and ketamine readministration after discontinuation in a rat model of neuropathic pain. To induce neuropathic pain, partial sciatic nerve ligation (PSNL) was performed in 15 male Wistar rats, and these animals were divided into three groups: PSNL (control), PSNL + ketamine 5 mg/kg (K5), and PSNL + ketamine 10 mg/kg (K10; n=5 each). Ketamine was injected intraperitoneally daily for 4 weeks, discontinued for 2 weeks, and then readministered for 1 week. Following PSNL, the mechanical withdrawal threshold was determined weekly using the Von Frey. The K10 group showed a significant increase in the mechanical withdrawal threshold, presented here as the target force (in g), at 21 and 28 days compared to the time point before ketamine injection (mean±SE, 276.0±24.0 vs. 21.6±2.7 and 300.0±0.0 vs. 21.6±2.7, respectively; P<0.01) and at 14, 21, and 28 days compared to the control group (108.2±51.2 vs. 2.7±1.3, 276.0±24.0 vs. 2.5±1.5, and 300.0±0.0 vs. 4.0±0.0, respectively; P<0.05). However, in the K10 group, the ketamine effects decreased significantly at 7 days after readministration compared to those after 28 days of repeated injections (P<0.05). In the K10 group, repeated ketamine injections showed a significant increase in antinociceptive effect for >2 weeks, but this ketamine effect decreased after drug readministration.
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Affiliation(s)
- N A Kim
- Department of Anesthesiology and Pain Medicine, Inha University Hospital, Inha University School of Medicine, Incheon, South Korea.
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11
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Yun HS, Kim YS, Yoon HS. Effect of Different Cultivation Modes (Photoautotrophic, Mixotrophic, and Heterotrophic) on the Growth of Chlorella sp. and Biocompositions. Front Bioeng Biotechnol 2022; 9:774143. [PMID: 34976972 PMCID: PMC8718857 DOI: 10.3389/fbioe.2021.774143] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Accepted: 11/26/2021] [Indexed: 11/18/2022] Open
Abstract
In the past, biomass production using microalgae culture was dependent on inorganic carbon sources as microalgae are photosynthetic organisms. However, microalgae utilize both organic and inorganic carbon sources, such as glucose. Glucose is an excellent source of organic carbon that enhances biomass yield and the content of useful substances in microalgae. In this study, photoautotrophic, mixotrophic, and heterotrophic cultivation conditions were applied to three well-known strains of Chlorella (KNUA104, KNUA114, and KNUA122) to assess biomass productivity, and compositional changes (lipid, protein, and pigment) were evaluated in BG11 media under photoautotrophic, mixotrophic, and heterotrophic conditions utilizing different initial concentrations of glucose (5, 10, 15, 20, and 25 g L−1). Compared to the photoautotrophic condition (biomass yield: KNUA104, 0.35 ± 0.04 g/L/d; KNUA114, 0.40 ± 0.08 g/L/d; KNUA122, 0.38 ± 0.05 g/L/d) glucose was absent, and the biomass yield improved in the mixotrophic (glucose: 20 g L−1; biomass yield: KNUA104, 2.99 ± 0.10 g/L/d; KNUA114, 5.18 ± 0.81 g/L/d; KNUA122, 5.07 ± 0.22 g/L/d) and heterotrophic conditions (glucose: 20 g L−1; biomass yield: KNUA104, 1.72 ± 0.26 g/L/d; KNUA114, 4.26 ± 0.27 g/L/d; KNUA122, 4.32 ± 0.32 g/L/d). All strains under mixotrophic and heterotrophic conditions were optimally cultured when 15–20 g L−1 initial glucose was provided. Although bioresourse productivity improved under both mixotrophic and heterotrophic conditions where mixotrophic conditions were found to be optimal as the yields of lipid and pigment were also enhanced. Protein content was less affected by the presence of light or the concentration of glucose. Under mixotrophic conditions, the highest lipid content (glucose: 15 g L−1; lipid content: 68.80 ± 0.54%) was obtained with Chlorella vulgaris KNUA104, and enhanced pigment productivity of Chlorella sorokiniana KNUA114 and KNUA122 (additional pigment yield obtained with 15 g L−1 glucose: KNUA 114, 0.33 ± 0.01 g L−1; KNUA122, 0.21 ± 0.01 g L−1). Also, saturated fatty acid (SFA) content was enhanced in all strains (SFA: KNUA104, 29.76 ± 1.31%; KNUA114, 37.01 ± 0.98%; KNUA122, 33.37 ± 0.17%) under mixotrophic conditions. These results suggest that mixotrophic cultivation of Chlorella vulgaris and Chlorella sorokiniana could improve biomass yield and the raw material quality of biomass.
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Affiliation(s)
- Hyun-Sik Yun
- School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Young-Saeng Kim
- Research Institute of Ulleung-do & Dok-do, Kyungpook National University, Daegu, South Korea
| | - Ho-Sung Yoon
- School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea.,Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, South Korea.,Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
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12
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Cho MJ, Kim YJ, Kim MJ, Kim YS, Park E, Choi KH, Kang JY, Kim HO, Koong MK, Kim YS, Yoon TK, Ko JJ, Lee JH. P–205 Epothilone D as an actin cytoskeleton stabilizer improved mitochondria bioenergenesis and blastocyst formation of mouse preimplantation embryo. Hum Reprod 2021. [DOI: 10.1093/humrep/deab130.204] [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
Study question
What is primary factor of bioenergetics product activity between microtubule instability and the functional activity of mitochondria in embryo?
Summary answer
The actin cytoskeleton instability is presumably the primary cause for the bioenergenesis of mitochondrial function to the preimplantation embryo development.
What is known already
Mitochondria are cellular organelles dynamically moving and morphological changes. It provides for homeostatic energy to the cell. The dynamic property of the mitochondria is associated with the microtubule network in the cell. However, the stability of the microtubule was clearly identified for preimplantation embryo development.
Study design, size, duration
This study is designed to assess the ATP productivity of the mitochondria, and specifically to observe what its primary factor is in terms of providing microtubule stability in mammalian cells. Additionally, we investigated the relationship between blastocyst formation and actin cytoskeleton stabilization by EpD with 2-cell mice.
Participants/materials, setting, methods
We prepared the microtubule stability regulation model with the HEK293 cell line by using the microtubule stabilizer as an Epothilone D (EpD). Then we analyzed the metabolic activity of the cells through oxidative phosphorylation (OXP) ratios analysis. Also, we performed confocal live imaging to observe mitochondria morphology depending on the cells’ microtubule. Next, we treated EpD to 2-cell culture media for the analysis of blastocyst development ratios.
Main results and the role of chance
EpD significantly increased fusion form. Also, EpD enhance bioenergy ratios like OXP in the mitochondria and functional activity related marker, like mTOR compared with the control. These results suggest that microtubule stabilization enhances mitochondrial metabolism by increasing oxygen consumption. Also, EpD in 2-cell culture media led to a significant increase in the speed of development and 50% higher hatched out blastocyst formation ratios compared to the control group.
Limitations, reasons for caution
This study had limited animal experiments. For the next study, we are planning with an aim to improve the quality and development ratios of human embryos by EpD.
Wider implications of the findings: Microtubule stabilizer has a possibility to recover the mitochondria’s functional activity in the preimplantation embryo development. Mitochondrial functional activity along the actin cytoskeleton may play a pivotal role in determining the embryo quality and development ratios for archive pregnancy.
Trial registration number
non-clinical trials
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Affiliation(s)
- M J Cho
- CHA University, Biomedical Sciences, Seoul, Korea- South
| | - Y J Kim
- CHA Medical Group, Reproductive and Molecular Medicine, Seoul, Korea- South
| | - M J Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - E Park
- CHA Fertility Center Seoul Station, Embryology lab, Seoul, Korea- South
| | - K H Choi
- CHA Fertility Center Seoul Station, Embryology lab, Seoul, Korea- South
| | - J Y Kang
- CHA Fertility Center Seoul Station, Embryology lab, Seoul, Korea- South
| | - H O Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - M K Koong
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - T K Yoon
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - J J Ko
- CHA University, Biomedical Sciences, Seoul, Korea- South
| | - J H Lee
- CHA fertility seoul center seoul sequare 3floor, Reproductive and Molecular Medicine., Seoul, Korea- South
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Choi KH, Kim YJ, Kang KY, Park EA, Kim YS, Kim MJ, Kim HO, Koong MK, Kim YS, Yoon TK, Ko JJ, Lee JH. P–657 Prostaglandin D2 is correlated with follicles development and a reliable marker of ovarian reserve of poor ovarian responder patients. Hum Reprod 2021. [DOI: 10.1093/humrep/deab130.656] [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
Study question
Is the prostaglandin D2 (PGD2) associated with growing follicles and ovarian reserve of poor ovarian responders?
Summary answer
PGD2 is correlated with ovarian stimulation activity and follicle growth. Especially, poor ovarian responders show a significant decrease in the level of follicular fluid.
What is known already
Prostaglandins (PGs) are involved in the female reproductive process, mainly ovulation, fertilization, and implantation.
Study design, size, duration
We investigated the PGD2 level in the follicular fluid of poor ovarian responders. The collection of human follicular fluid was approved by the Institutional Research and Ethical Committees of CHA University (approval number: 1044308–201611-BR–027–04) from January to December 2019. Follicular fluid was collected from patients with normal ovarian response and patients with POR.
Participants/materials, setting, methods
We studied whether prostaglandin has related to POR in the clinical key factor by measuring human follicular fluid. Follicular fluid was collected from patients with normal ovarian response and patients with POR. The concentration of PGD2 in follicular fluid was determined with ELISA kits following the manufacturer’s protocol.
Main results and the role of chance
We analyzed the level of PGD2 in the follicular fluid of patients with normal ovarian response and patients with POR using an ELISA. The PGD2 concentration was significantly lower in the follicular fluid of patients with POR than in the follicular fluid of young and old patients with normal ovarian response.
Limitations, reasons for caution
This study has an identification of biomarker of the clinical samples as POR criteria patients. Therefore, further investigations aimed at specific recovery of low PGD2 metabolic activity in the CCs during control ovarian stimulation.
Wider implications of the findings: Until now there is no specific biomarker of POR. AMH is just an ovary reserve marker for an indication of ovary function. PGD2 is one of the metabolites in steroid metabolism in the ovary. Therefore, we can find some cure through further study for improved PGD2 production to POR patients.
Trial registration number
none
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Affiliation(s)
- K H Choi
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
| | - Y J Kim
- CHA Medical Group, Advanced Research Division of Reproductive Medicine, Seoul, Korea- South
| | - K Y Kang
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
| | - E A Park
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - M J Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - H O Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - M K Koong
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - T K Yoon
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - J J Ko
- CHA University, Biomedical Science, Pocheon-si, Korea- South
| | - J H Lee
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
- CHA University, Biomedical Science, Pocheon-si, Korea- South
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14
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Kim YJ, Choi KH, Kang KY, Park EA, Kim YS, Kim MJ, Kim HO, Koong MK, Kim YS, Yoon TK, Ko JJ, Lee JH. P–658 Lovastatin promotes the expression of LDL receptor and enhances E2 production in the cumulus cells. Hum Reprod 2021. [DOI: 10.1093/humrep/deab130.657] [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: 11/15/2022] Open
Abstract
Abstract
Study question
Lovastatin enhanced E2 productive ratios in the cumulus cells through promoted expression of Low-density lipoprotein receptor (LDLR).
Summary answer
Lovastatin up-regulated gene expression of LDLR in the CCs. And the high expression of LDLR promoted E2 productive ratios from CCs.
What is known already
We already reported that the up-regulation of LDLR correlated with clinical pregnancy. Therefore, we found lovastatin as an up-regulator of LDLR expression of clinical pregnancy.
Study design, size, duration
This is an expended study of LDLR to enhance steroidogenesis regarding the effect of lovastatin in the CCs. The collection of human cumulus cells was approved by the Institutional Research and Ethical Committees of CHA University (approval number: 1044308–201611-BR–027–04) from January to December 2019. The CCs were collected from 12 patients with normal ovarian response after oocyte denudation for ICSI.
Participants/materials, setting, methods
We studied whether lovastatin has up-regulated LDLR expression in human CCs. Cumulus cells were collected from patients with young (∼ 36) and old aged patients (37 ∼). After culturing human CCs, they were treated lovastatin for one day. The concentration of E2 in culture medium was measured using Chemiluminescence immunoassay. The mRNA isolated from CCs was analyzed gene expression level through real time-PCR.
Main results and the role of chance
The concentration of E2 was significantly increased in the culture medium treated with lovastatin. The CCs treated with lovastatin increased the expression of LDLR and StAR which are components of the steroidogenesis pathway.
Limitations, reasons for caution
We have found that the role of lovastatin promotes the E2 production by increasing the ldlr gene of CCs. Therefore, further investigations aimed at lovastatin effect on human oocytes embryo whether enhanced quality of oocytes or not.
Wider implications of the findings: Previous data show that high activation of LDLR and StAR was associated with embryo quality and clinical pregnancy in infertile women. Our data suggest that lovastatin is stimulated LDLR expression to enhanced pregnancy ratios of IVF patients.
Trial registration number
none
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Affiliation(s)
- Y J Kim
- CHA Medical Group, Advanced Research Division of Reproductive Medicine, Seoul, Korea- South
| | - K H Choi
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
| | - K Y Kang
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
| | - E A Park
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - M J Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - H O Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - M K Koong
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - T K Yoon
- CHA Fertility Center Seoul Station, IVF clinic, Seoul, Korea- South
| | - J J Ko
- CHA University, Biomedical Science, Pocheon-si, Korea- South
| | - J H Lee
- CHA Fertility Center Seoul Station, Embryology Lab, Seoul, Korea- South
- CHA University, Biomedical Science, Pocheon-si, Korea- South
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15
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Seol HY, Kim YS, Kim SJ. Diagnostic test accuracy of 18F-FDG PET/CT for prediction of programmed death ligand 1 (PD-L1) expression in solid tumours: a meta-analysis. Clin Radiol 2021; 76:863.e19-863.e25. [PMID: 34261597 DOI: 10.1016/j.crad.2021.06.012] [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] [Received: 01/29/2021] [Accepted: 06/16/2021] [Indexed: 10/20/2022]
Abstract
AIM To investigate the predictive value of integrated 2-[18F]-fluoro-2-deoxy-d-glucose (18F-FDG) positron-emission tomography/computed tomography (PET/CT) for the prediction of programmed death ligand 1 (PD-L1) expression in solid tumours via a systematic review and meta-analysis. MATERIALS AND METHODS The PubMed, Cochrane, and EMBASE databases, from the earliest available date of indexing through 31 October 2020, were searched for studies evaluating the diagnostic performance of 18F-FDG PET/CT for prediction of PD-L1 expression in solid tumours other than lung cancer. RESULTS Across seven studies (473 patients), the pooled sensitivity for 18F-FDG PET/CT was 0.75 (95% confidence interval [CI]: 0.65-0.82) without heterogeneity (I2 = 47.2, p=0.08) and a pooled specificity of 0.73 (95% CI: 0.64-0.81) with heterogeneity (I2 = 53.8, p=0.04). Likelihood ratio (LR) syntheses gave an overall positive likelihood ratio (LR+) of 2.8 (95% CI: 2.1-3.7) and negative likelihood ratio (LR-) of 0.35 (95% CI: 0.26-0.47). The pooled diagnostic odds ratio (DOR) was 8 (95% CI: 5-13). Hierarchical summary receiver operating characteristic (ROC) curve and indicates that the area under the curve was 0.80 (95% CI: 0.77-0.84). CONCLUSION The current meta-analysis showed a moderate sensitivity and specificity of 18F-FDG PET/CT for the prediction of PD-L1 expression in solid tumours. At present, the literature regarding the use of 18F-FDG PET/CT for the prediction of PD-L1 expression in solid tumours still limited; thus, further large multicentre studies would be necessary to substantiate the diagnostic accuracy of 18F-FDG PET/CT for prediction of PD-L1 expression in solid tumours.
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Affiliation(s)
- H Y Seol
- Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, 50612, Republic of Korea
| | - Y S Kim
- Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, 50612, Republic of Korea
| | - S-J Kim
- Department of Nuclear Medicine, College of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea; Department of Nuclear Medicine, Pusan National University Yangsan Hospital, Yangsan, 50612, Republic of Korea; BioMedical Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, 50612, Republic of Korea.
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16
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Kim YS, Yun HS, Lee JH, Kim HS, Yoon HS. Environmental Factors Associated with the Eukaryotic Microbial Community and Microalgal Groups in the Mountain Marshes of South Korea. Pol J Microbiol 2021; 70:215-233. [PMID: 34349812 PMCID: PMC8326984 DOI: 10.33073/pjm-2021-019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 03/25/2021] [Accepted: 04/11/2021] [Indexed: 11/24/2022] Open
Abstract
The diversity indices of eukaryotic microalgal groups in the Jeonglyeongchi, Waegok, and Wangdeungjae marshes of Mount Jiri, Korea, were measured using Illumina MiSeq and culture-based analyses. Waegok marsh had the highest species richness, with a Chao1 value of 828.00, and the highest levels of species diversity, with Shannon and Simpson index values of 6.36 and 0.94, respectively, while Wangdeungjae marsh had the lowest values at 2.97 and 0.75, respectively. The predominant species in all communities were Phagocata sibirica (Jeonglyeongchi, 68.64%), Aedes albopictus (Waegok, 34.77%), Chaetonotus cf. (Waegok, 24.43%), Eimeria sp. (Wangdeungjae, 26.17%), and Eumonhystera cf. (Wangdeungjae, 22.27%). Relative abundances of the microalgal groups Bacillariophyta (diatoms) and Chlorophyta (green algae) in each marsh were respectively: Jeonglyeongchi 1.38% and 0.49%, Waegok 7.0% and 0.3%, and Wangdeungjae 10.41% and 4.72%. Illumina MiSeq analyses revealed 34 types of diatoms and 13 types of green algae. Only one diatom (Nitzschia dissipata) and five green algae (Neochloris sp., Chlamydomonas sp., Chlorococcum sp., Chlorella vulgaris, Scenedesmus sp.) were identified by a culture-based analysis. Thus, Illumina MiSeq analysis can be considered an efficient tool for analyzing microbial communities. Overall, our results described the environmental factors associated with geographically isolated mountain marshes and their respective microbial and microalgal communities.
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Affiliation(s)
- Young-Saeng Kim
- Research Institute of Ulleung-do and Dok-do, Kyungpook National University, Daegu, South Korea
| | - Hyun-Sik Yun
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Jea Hack Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Han-Soon Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea.,School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
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17
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Yun HS, Kim YS, Yoon HS. Enhancement of Biomass Production in Colony-Forming Green Algae, Botryosphaerella sudetica, Under Mixotrophic Cultivation. Front Genet 2021; 12:669702. [PMID: 34149810 PMCID: PMC8212961 DOI: 10.3389/fgene.2021.669702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 04/26/2021] [Indexed: 11/13/2022] Open
Abstract
In this study, we characterized the potential of colony-forming green algae, Botryosphaerella sudetica KNUA107, isolated from Ulleung Island, South Korea, as a bioresource and analyzed the effects of mixotrophic cultivation on its bioresource production efficiency. Internal transcribed spacer (ITS) (ITS1, 5.8S, and ITS2), ribulose bisphosphate carboxylase large subunit (rbcL), and elongation factor Tu (tufa) regions were used for molecular identification and phylogenetic analysis. B. sudetica KNUA107 had a strong relationship with the green algae of Botryococcus and Botryosphaerella genera, which are colony-forming species, and was also associated with members of the Neochloris genus. To improve biomass productivity, we tested mixotrophic cultivation conditions using several organic carbon sources. Glucose supplementation stimulated B. sudetica KNUA107 growth and reduced the time needed to reach the stationary phase. In addition, the colony size was 1.5–2.0 times larger with glucose than in photoautotrophic cultures, and settleability improved in proportion to colony size. The total lipid content and biomass productivity were also higher in cultures supplemented with glucose. Among the lipid components, saturated fatty acids and monounsaturated fatty acids had the highest proportion. Our study suggests that B. sudetica KNUA107, which has enhanced efficiency in biomass production and lipid components under mixotrophic cultivation, has high potential as a bioresource.
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Affiliation(s)
- Hyun-Sik Yun
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea.,BK21 FOUR KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, South Korea
| | - Young-Saeng Kim
- Research Institute of Ulleung-do and Dok-do, Kyungpook National University, Daegu, South Korea
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea.,BK21 FOUR KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, South Korea
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18
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Gisina AM, Kim YS, Yarygin KN, Lupatov AY. [Identification of the side population associated with ATP-binding cassette transporters activity using imaging flow cytometry]. Biomed Khim 2021; 67:137-143. [PMID: 33860770 DOI: 10.18097/pbmc20216702137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
DyeCycle Violet efflux, caused by ATP-binding cassette transporters activity, was analyzed in human colorectal adenocarcinoma cell lines SW480, HT-29, Caco-2 by neans of FACSAria III flow cytometer and ImageStreamX Mk II imaging flow cytometer. Along with similarity of cytometry data obtained on the two instruments, the use of imaging flow cytometry made it possible to characterize the morphology of side population cells, as well as morphology of other cell populations differing in the degree of dye accumulation. The population of cells, which are smaller than the side population cells and practically do not take the dye, is of the special interest. Probably, this population may contribute to the tumor resistance to chemotherapy.
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Affiliation(s)
- A M Gisina
- Institute of Biomedical Chemistry, Moscow, Russia
| | - Y S Kim
- Institute of Biomedical Chemistry, Moscow, Russia
| | - K N Yarygin
- Institute of Biomedical Chemistry, Moscow, Russia
| | - A Yu Lupatov
- Institute of Biomedical Chemistry, Moscow, Russia
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Kim DK, Lim HS, Eun KM, Seo Y, Kim JK, Kim YS, Kim MK, Jin S, Han SC, Kim DW. Subepithelial neutrophil infiltration as a predictor of the surgical outcome of chronic rhinosinusitis with nasal polyps. Rhinology 2021; 59:173-180. [PMID: 33129200 DOI: 10.4193/rhin20.373] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Neutrophils present as major inflammatory cells in refractory chronic rhinosinusitis with nasal polyps (CRSwNP), regardless of the endotype. However, their role in the pathophysiology of CRSwNP remains poorly understood. We investigated factors predicting the surgical outcomes of CRSwNP patients with focus on neutrophilic localization. METHODS We employed machine-learning methods such as the decision tree and random forest models to predict the surgical outcomes of CRSwNP. Immunofluorescence analysis was conducted to detect human neutrophil elastase (HNE), Bcl-2, and Ki-67 in NP tissues. We counted the immunofluorescence-positive cells and divided them into three groups based on the infiltrated area, namely, epithelial, subepithelial, and perivascular groups. RESULTS On machine learning, the decision tree algorithm demonstrated that the number of subepithelial HNE-positive cells, Lund-Mackay (LM) scores, and endotype (eosinophilic or non-eosinophilic) were the most important predictors of surgical outcomes in CRSwNP patients. Additionally, the random forest algorithm showed that, after ranking the mean decrease in the Gini index or the accuracy of each factor, the top three ranking factors associated with surgical outcomes were the LM score, age, and number of subepithelial HNE-positive cells. In terms of cellular proliferation, immunofluorescence analysis revealed that Ki-67/HNE-double positive and Bcl-2/HNE-double positive cells were significantly increased in the subepithelial area in refractory CRSwNP. CONCLUSION Our machine-learning approach and immunofluorescence analysis demonstrated that subepithelial neutrophils in NP tissues had a high expression of Ki-67 and could serve as a cellular biomarker for predicting surgical outcomes in CRSwNP patients.
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Affiliation(s)
- D-K Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Chuncheon Sacred Heart Hospital and Institute of New Frontier Research, Hallym University College of Medicine, Chuncheon, Republic of Korea; Division of Big Data and Artificial Intelligence, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - H-S Lim
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - K M Eun
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Y Seo
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - J K Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Y S Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - M-K Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - S Jin
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - S C Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - D W Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea
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20
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Kim SH, Jung S, Seok B, Kim YS, Park H, Otsu T, Kobayashi Y, Kim C, Ishida Y. A compact and stable incidence-plane-rotating second harmonics detector. Rev Sci Instrum 2021; 92:043905. [PMID: 34243408 DOI: 10.1063/5.0047337] [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] [Received: 02/12/2021] [Accepted: 04/05/2021] [Indexed: 06/13/2023]
Abstract
We describe a compact and stable setup for detecting the optical second harmonics, in which the incident plane rotates with respect to the sample. The setup is composed of rotating Fresnel rhomb optics and a femtosecond ytterbium-doped fiber laser source operating at the repetition frequency of 10 MHz. The setup including the laser source occupies an area of 1 m2 and is stable so that the intensity fluctuation of the laser harmonics can be less than 0.2% for 4 h. We present the isotropic harmonic signal of a gold mirror of 0.5 pW and demonstrate the integrity and sensitivity of the setup. We also show the polarization-dependent six-fold pattern of the harmonics of a few-layer WSe2, from which we infer the degree of local-field effects. Finally, we describe the extensibility of the setup to investigate the samples in various conditions such as cryogenic, strained, ultrafast non-equilibrium, and high magnetic fields.
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Affiliation(s)
- S H Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
| | - S Jung
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
| | - B Seok
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
| | - Y S Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
| | - H Park
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
| | - T Otsu
- ISSP, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - Y Kobayashi
- ISSP, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - C Kim
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
| | - Y Ishida
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
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21
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Juhn JW, Lee KC, Lee TG, Wi HM, Kim YS, Hahn SH, Nam YU. Multi-chord IR-visible two-color interferometer on KSTAR. Rev Sci Instrum 2021; 92:043559. [PMID: 34243393 DOI: 10.1063/5.0043811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/29/2021] [Indexed: 06/13/2023]
Abstract
Major parts of an IR-visible two-color interferometer (TCI) on KSTAR have been upgraded for the multi-chord operation: (1) a diode-pumped-solid-state (DPSS) laser (660 nm) replacing the former HeNe laser (633 nm), (2) vacuum-compatible vibration isolator with titanium retro-reflectors, and (3) full digital phase comparator for multi-chord real-time density signals. The commercial compact DPSS laser suits the multiple chord configuration with its strong beam power (500 mW) and long coherent length (>100 m). Ti retro-reflectors are mounted on vacuum-compatible vibration isolators. The isolators are essential for the visible beams to avoid any fringe skips due to their short wavelength, considering the speed of the mechanical vibration (up to hundreds of μm). Field-programmable-gate-array (FPGA) modules count the entire fringes fast enough with a signal output rate up to 1.25 MHz, solving the fringe skip issues. The FPGA module enables the full digital processing of the phase comparator with a CORDIC algorithm after the sampling rate of 160 MS/s for the 40 MHz intermediate frequency of each beam. The full digital signals are transferred to the main plasma control system in real-time. Stable single-input-single-output operation of the KSTAR density control was demonstrated with the TCI. The real-time density profile control is also promising in the near future, with multiple actuators such as pellets and gas puffings.
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Affiliation(s)
- June-Woo Juhn
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
| | - K C Lee
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
| | - T G Lee
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
| | - H M Wi
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
| | - Y S Kim
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
| | - S H Hahn
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
| | - Y U Nam
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
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22
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Park SI, Kim JJ, Kim HS, Kim YS, Yoon HS. Enhanced glutathione content improves lateral root development and grain yield in rice plants. Plant Mol Biol 2021; 105:365-383. [PMID: 33206358 DOI: 10.1007/s11103-020-01093-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 11/04/2020] [Indexed: 05/20/2023]
Abstract
Enhanced glutathione content improves lateral root development by positively regulating the transcripts of root development genes responsive to glutathione treatment, thereby increasing the overall productivity of rice plants. Glutathione is primarily known as a cellular antioxidant molecule, but its role in lateral root development in rice plants has not been elucidated. Here, we have investigated its role in lateral root development of rice Oryza sativa L. Exogenous glutathione (GSH) promoted both the number and length of lateral roots in rice, and the GSH biosynthesis inhibitor buthionine sulfoximine (BSO) significantly reduced these parameters, compared to untreated plants. The inhibition by BSO was reversed with exogenous GSH. Transcript profiling by RNA-seq revealed that expression of the transcription factor genes DREB and ERF and the hormone-related genes AOS, LOX, JAZ, and SAUR were significantly downregulated in the BSO-treated plants and, in contrast, upregulated in plants treated with GSH and with GSH and BSO together. We generated OsGS-overexpressing transgenic plants in which the transgene is controlled by the abiotic-stress-inducible OsRab21 promoter to study the effect of endogenously increased GSH levels. In cold stress, transgenic rice plants enhanced stress tolerance and lateral root development by maintaining redox homeostasis and improving upregulating the expression of transcription factors and hormone-related genes involved in lateral root development. We observed improved root growth of OsGS-overexpressing plants in paddy fields compared to the wild-type controls. These traits may have alleviated transplanting stress during early growth in the field and accounted for the increased productivity. These results provide information and perspectives on the role of GSH in gene expression, lateral root development, and grain yield in rice.
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Affiliation(s)
- Seong-Im Park
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Jin-Ju Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Hyeng-Soo Kim
- Institute of Life Science and Biotechnology, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Young-Saeng Kim
- Research Institute for Dok-Do and Ulleung-Do, Kyungpook National University, Daegu, 41566, Republic of Korea.
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea.
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, 41566, Republic of Korea.
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23
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Lee SG, Kim MK, Kim YS. Progress of x-ray imaging crystal spectrometer utilizing double crystal assembly on KSTAR. Rev Sci Instrum 2021; 92:023501. [PMID: 33648144 DOI: 10.1063/5.0041202] [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] [Received: 12/21/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
The x-ray imaging crystal spectrometer (XICS) for Korea Superconducting Tokamak Advanced Research (KSTAR) has been upgraded to increase its performance including measurement capabilities and stable operation. A dual crystal assembly for simultaneous measurements of the helium-like and hydrogen-like Ar spectra is successfully installed for improving measurement capabilities. Using a safety viewing port with an illuminator and removing the XICS control system from the harsh KSTAR tokamak hall for a stable operation are newly performed. The experimental results from the improved XICS are investigated.
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Affiliation(s)
- S G Lee
- Korea Institute of Fusion Energy, 169-148 Gwahangno, Yueseong-gu, Daejeon 34133, South Korea
| | - M K Kim
- Korea Institute of Fusion Energy, 169-148 Gwahangno, Yueseong-gu, Daejeon 34133, South Korea
| | - Y S Kim
- Korea Institute of Fusion Energy, 169-148 Gwahangno, Yueseong-gu, Daejeon 34133, South Korea
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Kim DH, Yun HS, Kim YS, Kim JG. Effects of Co-culture on Improved Productivity and Bioresource for Microalgal Biomass Using the Floc-Forming Bacteria Melaminivora Jejuensis. Front Bioeng Biotechnol 2020; 8:588210. [PMID: 33392165 PMCID: PMC7775480 DOI: 10.3389/fbioe.2020.588210] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 11/30/2020] [Indexed: 12/21/2022] Open
Abstract
Bacterial and algal floc formation was induced by inoculating three species of wastewater-derived bacteria (Melaminivora jejuensis, Comamonas flocculans, and Escherichia coli) into algal cultures (Chlorella sorokiniana). Bacterial and algal flocs formed in algal cultures inoculated with M. jejuensis and C. flocculans, and these flocs showed higher sedimentation rates than pure algal culture. The floc formed by M. jejuensis (4988.46 ± 2589.81 μm) was 10-fold larger than the floc formed by C. flocculans (488.60 ± 226.22 μm), with a three-fold higher sedimentation rate (M. jejuensis, 91.08 ± 2.32% and C. flocculans, 32.55 ± 6.33%). Biomass and lipid productivity were improved with M. jejuensis inoculation [biomass, 102.25 ± 0.35 mg/(L·day) and 57.80 ± 0.20 mg/(L·day)] compared with the productivity obtained under pure algal culture conditions [biomass, 78.00 ± 3.89 mg/(L·day) and lipids, 42.26 ± 2.11 mg/(L·day)]. Furthermore, the fatty acid composition of the biomass produced under pure algal culture conditions was mainly composed of C16:0 (43.67%) and C18:2 (45.99%), whereas the fatty acid composition of the biomass produced by M. jejuensis was mainly C16:0 (31.80%), C16:1 (24.45%), C18:1 (20.23%), and C18:2 (16.11%). These results suggest the possibility of developing an efficient method for harvesting microalgae using M. jejuensis and provide information on how to improve biomass productivity using floc-forming bacteria.
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Affiliation(s)
- Dong-Hyun Kim
- School of Applied Biosciences, Kyungpook National University, Daegu, South Korea
| | - Hyun-Sik Yun
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Young-Saeng Kim
- Research Institute of Ulleung-Do & Dok-Do, Kyungpook National University, Daegu, South Korea
| | - Jong-Guk Kim
- School of Applied Biosciences, Kyungpook National University, Daegu, South Korea.,School of Life Sciences and Biotechnology, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
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25
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Garvey S, Holmes JD, Kim YS, Long B. Vapor-Phase Passivation of Chlorine-Terminated Ge(100) Using Self-Assembled Monolayers of Hexanethiol. ACS Appl Mater Interfaces 2020; 12:29899-29907. [PMID: 32501666 DOI: 10.1021/acsami.0c02548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Continued scaling of electronic devices shows the need to incorporate high mobility alternatives to silicon, the cornerstone of the semiconductor industry, into modern field effect transistor (FET) devices. Germanium is well-poised to serve as the channel material in FET devices as it boasts an electron and hole mobility more than twice and four times that of Si, respectively. However, its unstable native oxide makes its passivation a crucial step toward its potential integration into future FETs. The International Roadmap for Devices and Systems (IRDS) predicts continued aggressive scaling not only of the device size but also of the pitch in nanowire arrays. The development of a vapor-phase chemical passivation technique will be required to prevent the collapse of these structures that can occur because of the surface tension and capillary forces that are experienced when tight-pitched nanowire arrays are processed via liquid-phase chemistry. Reported here is a vapor-phase process using hexanethiol for the passivation of planar Ge(100) substrates. Results benchmarking it against its well-established liquid-phase equivalent are also presented. X-ray photoelectron spectroscopy was used to monitor the effectiveness of the developed vapor-phase protocol, where the presence of oxide was monitored at 0, 24, and 168 h. Water contact angle measurements compliment these results by demonstrating an increase in hydrophobicity of the passivated substrates. Atomic force microscopy monitored the surface topology before and after processing to ensure the process does not cause roughening of the surface, which is critical to demonstrate suitability for nanostructures. It is shown that the 200 min vapor-phase passivation procedure generates stable, passivated surfaces with less roughness than the liquid-phase counterpart.
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Affiliation(s)
- Shane Garvey
- School of Chemistry & AMBER Centre, University College Cork, Cork T12 YN60, Ireland
- Tyndall National Institute, University College Cork, Cork T12 R5CP, Ireland
| | - Justin D Holmes
- School of Chemistry & AMBER Centre, University College Cork, Cork T12 YN60, Ireland
| | - Y S Kim
- Lam Research Corp., Fremont, California 94538, United States
| | - Brenda Long
- School of Chemistry & AMBER Centre, University College Cork, Cork T12 YN60, Ireland
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26
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Hung NT, Lam NH, Nguyen AD, Bac LH, Trung NN, Dung DD, Kim YS, N Tsogbadrakh, Ochirkhuyag T, Odkhuu D. Intrinsic and tunable ferromagnetism in Bi 0.5Na 0.5TiO 3 through CaFeO 3-δ modification. Sci Rep 2020; 10:6189. [PMID: 32277074 PMCID: PMC7148307 DOI: 10.1038/s41598-020-62889-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 03/13/2020] [Indexed: 11/13/2022] Open
Abstract
New (1-x)Bi0.5Na0.5TiO3 + xCaFeO3-δ solid solution compounds were fabricated using a sol–gel method. The CaFeO3-δ materials were mixed into host Bi0.5Na0.5TiO3 materials to form a solid solution that exhibited similar crystal symmetry to those of Bi0.5Na0.5TiO3 phases. The random distribution of Ca and Fe cations in the Bi0.5Na0.5TiO3 crystals resulted in a distorted structure. The optical band gaps decreased from 3.11 eV for the pure Bi0.5Na0.5TiO3 samples to 2.34 eV for the 9 mol% CaFeO3-δ-modified Bi0.5Na0.5TiO3 samples. Moreover, the Bi0.5Na0.5TiO3 samples exhibited weak photoluminescence because of the intrinsic defects and suppressed photoluminescence with increasing CaFeO3-δ concentration. Experimental and theoretical studies via density functional theory calculations showed that pure Bi0.5Na0.5TiO3 exhibited intrinsic ferromagnetism, which is associated with the possible presence of Bi, Na, and Ti vacancies and Ti3+-defect states. Further studies showed that such an induced magnetism by intrinsic defects can also be enhanced effectively with CaFeO3-δ addition. This study provides a basis for understanding the role of secondary phase as a solid solution in Bi0.5Na0.5TiO3 to facilitate the development of lead-free ferroelectric materials.
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Affiliation(s)
- N T Hung
- School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam
| | - N H Lam
- School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam
| | - A D Nguyen
- Department of Physics, Faculty of Basic-Fundamental Sciences, Viet Nam Maritime University, 484 Lach Tray Road, Le Chan, Hai Phong, Viet Nam.,Department of Physics, University of Ulsan, Ulsan, 680-749, Republic of Korea
| | - L H Bac
- School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam
| | - N N Trung
- School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam
| | - D D Dung
- School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, Viet Nam.
| | - Y S Kim
- Department of Physics, University of Ulsan, Ulsan, 680-749, Republic of Korea.
| | - N Tsogbadrakh
- Department of Physics, National University of Mongolia, Ulaanbaatar, 14201, Mongolia
| | - T Ochirkhuyag
- Department of Physics, Incheon National University, Incheon, 22012, Republic of Korea
| | - D Odkhuu
- Department of Physics, Incheon National University, Incheon, 22012, Republic of Korea.
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27
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Park CH, Lee B, Oh E, Kim YS, Choi YM. Combined effects of sous-vide cooking conditions on meat and sensory quality characteristics of chicken breast meat. Poult Sci 2020; 99:3286-3291. [PMID: 32475464 PMCID: PMC7597729 DOI: 10.1016/j.psj.2020.03.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 02/19/2020] [Indexed: 11/18/2022] Open
Abstract
This study investigated the combined effects of cooking temperature and time on the meat and eating quality characteristics of the sous-vide chicken breast. For the control group, chicken breast samples were cooked in a convection oven until the internal temperature reached 71°C. Each sample for sous-vide cooking was vacuum packaged and then cooked under continuous thermocontrolled conditions in a water bath at 6 combinations of cooking temperature (60 and 70°C) and time (1, 2, and 3 h). Sous-vide cooked chicken meat at 60°C for 1 h (SV60-1h) showed lower cooking loss (6.58 vs. 26.5%, P < 0.05), Warner-Bratzler shear force (21.7 vs. 29.1 N, P < 0.05), and hardness (9.40 vs. 17.3 N, P < 0.05) than meat cooked by conventional oven. Similar to the objective tenderness parameters, cooked chicken meat from the SV60 treatments for all cooking times showed higher scores in all the tenderness attributes than the control group (P < 0.05). However, a higher flavor intensity was observed in the SV70-3h and control groups than in the SV60 treatments (P < 0.05). Owing to a lesser developed flavor in chicken meat from the SV60-1h treatment, the SV60-2h and 3h treatments were assigned a higher acceptability rating for overall impression (P < 0.05). Therefore, cooking temperature and time of sous-vide significantly influenced the physicochemical and palatability characteristics of chicken breast. In this study, the optimum conditions for the sous-vide chicken breast are to continuously cook at 60°C for 2 to 3 h to improve sensory quality characteristics without reducing the water-holding capacity.
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Affiliation(s)
- C H Park
- Department of Integrated Biomedical and Life Sciences, Korea University, Seoul, South Korea; Department of Hotel and Food Service Culinary Art, Daejeon Health Institute of Technology, Daejeon, South Korea
| | - B Lee
- Department of Animal Sciences, Kyungpook National University, Sangju, South Korea
| | - E Oh
- Department of Animal Sciences, Kyungpook National University, Sangju, South Korea
| | - Y S Kim
- Department of Integrated Biomedical and Life Sciences, Korea University, Seoul, South Korea.
| | - Y M Choi
- Department of Animal Sciences, Kyungpook National University, Sangju, South Korea.
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Kim YS, Park SI, Kim JJ, Boyd JS, Beld J, Taton A, Lee KI, Kim IS, Golden JW, Yoon HS. Expression of Heterologous OsDHAR Gene Improves Glutathione (GSH)-Dependent Antioxidant System and Maintenance of Cellular Redox Status in Synechococcus elongatus PCC 7942. Front Plant Sci 2020; 11:231. [PMID: 32194605 PMCID: PMC7063034 DOI: 10.3389/fpls.2020.00231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 02/14/2020] [Indexed: 06/10/2023]
Abstract
An excess of reactive oxygen species (ROS) can cause severe oxidative damage to cellular components in photosynthetic cells. Antioxidant systems, such as the glutathione (GSH) pools, regulate redox status in cells to guard against such damage. Dehydroascorbate reductase (DHAR, EC 1.8.5.1) catalyzes the glutathione-dependent reduction of oxidized ascorbate (dehydroascorbate) and contains a redox active site and glutathione binding-site. The DHAR gene is important in biological and abiotic stress responses involving reduction of the oxidative damage caused by ROS. In this study, transgenic Synechococcus elongatus PCC 7942 (TA) was constructed by cloning the Oryza sativa L. japonica DHAR (OsDHAR) gene controlled by an isopropyl β-D-1-thiogalactopyranoside (IPTG)-inducible promoter (Ptrc) into the cyanobacterium to study the functional activities of OsDHAR under oxidative stress caused by hydrogen peroxide exposure. OsDHAR expression increased the growth of S. elongatus PCC 7942 under oxidative stress by reducing the levels of hydroperoxides and malondialdehyde (MDA) and mitigating the loss of chlorophyll. DHAR and glutathione S-transferase activity were higher than in the wild-type S. elongatus PCC 7942 (WT). Additionally, overexpression of OsDHAR in S. elongatus PCC 7942 greatly increased the glutathione (GSH)/glutathione disulfide (GSSG) ratio in the presence or absence of hydrogen peroxide. These results strongly suggest that DHAR attenuates deleterious oxidative effects via the glutathione (GSH)-dependent antioxidant system in cyanobacterial cells. The expression of heterologous OsDHAR in S. elongatus PCC 7942 protected cells from oxidative damage through a GSH-dependent antioxidant system via GSH-dependent reactions at the redox active site and GSH binding site residues during oxidative stress.
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Affiliation(s)
- Young-Saeng Kim
- Research Institute for Dok-do and Ulleung-do, Kyungpook National University, Daegu, South Korea
| | - Seong-Im Park
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
- Department of Biology, Kyungpook National University, Daegu, South Korea
| | - Jin-Ju Kim
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
- Department of Biology, Kyungpook National University, Daegu, South Korea
| | - Joseph S. Boyd
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA, United States
| | - Joris Beld
- Department of Microbiology and Immunology, College of Medicine, Drexel University, Philadelphia, PA, United States
| | - Arnaud Taton
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA, United States
| | - Kyoung-In Lee
- Biotechnology Industrialization Center, Dongshin University, Naju, South Korea
| | - Il-Sup Kim
- Advanced Bio Resource Research Center, Kyungpook National University, Daegu, South Korea
| | - James W. Golden
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA, United States
| | - Ho-Sung Yoon
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
- Department of Biology, Kyungpook National University, Daegu, South Korea
- Advanced Bio Resource Research Center, Kyungpook National University, Daegu, South Korea
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Lupatov AY, Gisina AM, Kim YS, Bykasov SA, Volchenko NN, Sidorov DV, Yarygin KN, Kholodenko RV. [Expression of ganglioside GD2 on colorectal adenocarcinoma cells]. Biomed Khim 2020; 66:95-99. [PMID: 32116232 DOI: 10.18097/pbmc20206601095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Using flow cytometry GD2 ganglioside expression was evaluated both on colorectal adenocarcinoma cell lines and on tumor tissue samples from colorectal cancer patients. The marker was found on EpCAM-positive tumor cells in 6 of 12 patients' samples but not on the HT29 and CaCo-2 cell lines. GD2 expression was not an exceptional feature of cancer stem cells, since its expression level was similar on CD133-positive and CD133-negative tumor cells. Thus, the presence of GD2 ganglioside was revealed on colorectal adenocarcinoma cells for the first time. This finding makes it possible to use targeted therapy to treat this disease.
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Affiliation(s)
- A Yu Lupatov
- Institute of Biomedical Chemistry, Moscow, Russia
| | - A M Gisina
- Institute of Biomedical Chemistry, Moscow, Russia
| | - Y S Kim
- Institute of Biomedical Chemistry, Moscow, Russia
| | - S A Bykasov
- Hertsen Moscow Oncology Research Center - branch of National Medical Research Radiological Center of the Ministry of Health, Moscow, Russia
| | - N N Volchenko
- Hertsen Moscow Oncology Research Center - branch of National Medical Research Radiological Center of the Ministry of Health, Moscow, Russia
| | - D V Sidorov
- Hertsen Moscow Oncology Research Center - branch of National Medical Research Radiological Center of the Ministry of Health, Moscow, Russia
| | - K N Yarygin
- Institute of Biomedical Chemistry, Moscow, Russia
| | - R V Kholodenko
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia
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Park SI, Kim JJ, Shin SY, Kim YS, Yoon HS. ASR Enhances Environmental Stress Tolerance and Improves Grain Yield by Modulating Stomatal Closure in Rice. Front Plant Sci 2020; 10:1752. [PMID: 32117337 PMCID: PMC7033646 DOI: 10.3389/fpls.2019.01752] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 12/13/2019] [Indexed: 05/24/2023]
Abstract
Abscisic acid-, stress-, and ripening-induced (ASR) genes are involved in responding to abiotic stresses, but their precise roles in enhancing grain yield under stress conditions remain to be determined. We cloned a rice (Oryza sativa) ASR gene, OsASR1, and characterized its function in rice plants. OsASR1 expression was induced by abscisic acid (ABA), salt, and drought treatments. Transgenic rice plants overexpressing OsASR1 displayed improved water regulation under salt and drought stresses, which was associated with osmolyte accumulation, improved modulation of stomatal closure, and reduced transpiration rates. OsASR1-overexpressing plants were hypersensitive to exogenous ABA and accumulated higher endogenous ABA levels under salt and drought stresses, indicating that OsASR1 is a positive regulator of the ABA signaling pathway. The growth of OsASR1-overexpressing plants was superior to that of wild-type (WT) plants under paddy field conditions when irrigation was withheld, likely due to improved modulation of stomatal closure via modified ABA signaling. The transgenic plants had higher grain yields than WT plants for four consecutive generations. We conclude that OsASR1 has a crucial role in ABA-mediated regulation of stomatal closure to conserve water under salt- and drought-stress conditions, and OsASR1 overexpression can enhance salinity and drought tolerance, resulting in improved crop yields.
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Affiliation(s)
- Seong-Im Park
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Jin-Ju Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Sun-Young Shin
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Young-Saeng Kim
- Research Institute for Dok-do and Ulleung-do, Kyungpook National University, Daegu, South Korea
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, South Korea
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Kim JE, Kim YC, Min SL, Lee H, Ha J, Chin HJ, Kim YS, Han SS. Transplant outcomes in kidney recipients with lupus nephritis, and systematic review. Lupus 2020; 29:248-255. [DOI: 10.1177/0961203320902524] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background Despite improved survival of patients with lupus nephritis (LN), some require kidney transplantation because of progression to end-stage renal disease (ESRD). However, the transplant outcomes of these patients and other recipients have not been thoroughly compared. Methods In total, 1848 Korean kidney recipients who underwent transplantation from 1998 to 2017 at two tertiary referral centers were evaluated retrospectively. Among them, 28 recipients with LN, and 50 control recipients matched by age, sex, and donor type, were compared with respect to graft and patient survival. We pooled our data with 17 previous cohort studies in which the graft survival of recipients with LN was described in detail. Results During the median follow-up period of 9.5 years (maximum 21 years), graft failure (GF) occurred in 10.7% and 16.0% of LN and control recipients, respectively. No differences were found in the rates of GF and death-censored graft failure or patient survival between the two groups. The risks of acute T cell-mediated and antibody-mediated rejection were also similar between the two groups. The pooled analysis showed similar 1- and 5-year graft survival rates between LN and control recipients. Conclusions Kidney transplantation is an acceptable option in patients with concurrent LN and ESRD.
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Affiliation(s)
- J E Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Y C Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - S-l Min
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - H Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - J Ha
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - H J Chin
- Department of Internal Medicine, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
| | - Y S Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - S S Han
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
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Yun HS, Kim YS, Yoon HS. Illumina MiSeq Analysis and Comparison of Freshwater Microalgal Communities on Ulleungdo and Dokdo Islands. Pol J Microbiol 2019; 68:527-539. [PMID: 31880896 PMCID: PMC7261877 DOI: 10.33073/pjm-2019-053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/23/2019] [Accepted: 10/30/2019] [Indexed: 11/05/2022] Open
Abstract
Ulleungdo and Dokdo are volcanic islands with an oceanic climate located off the eastern coast of South Korea. In the present study, we used barcoded Illumina MiSeq to analyze eukaryotic microalgal genera collected from Seonginbong, the highest peak on Ulleungdo, and from groundwater sites on Dongdo and Seodo Islands, which are part of Dokdo. Species richness was significantly greater in the Seonginbong samples than in the Dongdo and Seodo samples, with 834 operational taxonomic units (OTUs) identified from Seonginbong compared with 203 OTUs and 182 OTUs from Dongdo and Seodo, respectively. Taxonomic composition analysis was also used to identify the dominant microalgal phyla at each of the three sites, with Chlorophyta (green algae) the most abundant phyla on Seonginbong and Dongdo, and Bacillariophyta (diatoms) the most abundant on Seodo. These findings suggest that differences in the abundances of Chlorophyta and Bacillariophyta species in the Seonginbong, Dongdo, and Seodo samples are due to variations in species richness and freshwater resources at each sampling location. To the best of our knowledge, this is the first report to detail freshwater microalgal communities on Ulleungdo and Dokdo. As such, the number of species identified in the Seonginbong, Dongdo, and Seodo samples might be an indicator of the ecological differences among these sites and varying characteristics of their microbial communities. Information regarding the microalgal communities also provides a basis for understanding the ecological interactions between microalgae species and other eukaryotic microorganisms. Ulleungdo and Dokdo are volcanic islands with an oceanic climate located off the eastern coast of South Korea. In the present study, we used barcoded Illumina MiSeq to analyze eukaryotic microalgal genera collected from Seonginbong, the highest peak on Ulleungdo, and from groundwater sites on Dongdo and Seodo Islands, which are part of Dokdo. Species richness was significantly greater in the Seonginbong samples than in the Dongdo and Seodo samples, with 834 operational taxonomic units (OTUs) identified from Seonginbong compared with 203 OTUs and 182 OTUs from Dongdo and Seodo, respectively. Taxonomic composition analysis was also used to identify the dominant microalgal phyla at each of the three sites, with Chlorophyta (green algae) the most abundant phyla on Seonginbong and Dongdo, and Bacillariophyta (diatoms) the most abundant on Seodo. These findings suggest that differences in the abundances of Chlorophyta and Bacillariophyta species in the Seonginbong, Dongdo, and Seodo samples are due to variations in species richness and freshwater resources at each sampling location. To the best of our knowledge, this is the first report to detail freshwater microalgal communities on Ulleungdo and Dokdo. As such, the number of species identified in the Seonginbong, Dongdo, and Seodo samples might be an indicator of the ecological differences among these sites and varying characteristics of their microbial communities. Information regarding the microalgal communities also provides a basis for understanding the ecological interactions between microalgae species and other eukaryotic microorganisms.
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Affiliation(s)
- Hyun-Sik Yun
- Department of Biology, College of Natural Sciences, Kyungpook National University , Daegu , South Korea ; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University , Daegu , South Korea
| | - Young-Saeng Kim
- Research Institute of Ulleung-do & Dok-do, Kyungpook National University , Daegu , South Korea
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University , Daegu , South Korea ; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University , Daegu , South Korea
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Wang L, Paeng D, Jin Z, Zhang H, Kim YS, Rho Y, Eliceiri M, Grigoropoulos CP. Design and validation of a ten nanosecond resolved resistive thermometer for Gaussian laser beam heating. Rev Sci Instrum 2019; 90:124903. [PMID: 31893827 DOI: 10.1063/1.5118811] [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] [Received: 07/05/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
Pulsed laser processing plays a crucial role in additive manufacturing and nanomaterial processing. However, probing the transient temperature field during the pulsed laser interaction with the processed materials is challenging as it requires both high spatial and temporal resolution. Previous transient thermometry studies have measured neither sub-100 µm spatial resolution nor sub-10 ns temporal resolution. The temperature field induced by Gaussian laser beam profiles has also not been accounted for. Here, we demonstrate a 9 ns rise time, 50 µm sized Pt thin-film sensor for probing the temperature field generated by a nanosecond pulsed laser on a semiconductor thin film. The measurement error sources and associated improvements in the thin film fabrication, sensor patterning, and electrical circuitry are discussed. We carried out the first experimental and theoretical analysis of spatial resolution and accuracy for measuring a Gaussian pulse on the serpentine structure. Transparent silica and sapphire substrates, as well as 7-45 nm insulation layer thicknesses, are compared for sensing accuracy and temporal resolution. Finally, the measured absolute temperature magnitude is validated through the laser-induced melting of the 40 nm thick amorphous silicon film. Preliminary study shows its potential application for probing heat conduction among ultrathin films.
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Affiliation(s)
- Letian Wang
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720-1740, USA
| | - Dongwoo Paeng
- Lam Research Corporation, 4650 Cushing Pkwy, Fremont, California 94538, USA
| | - Zeqing Jin
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720-1740, USA
| | - He Zhang
- Lam Research Corporation, 4650 Cushing Pkwy, Fremont, California 94538, USA
| | - Y S Kim
- Lam Research Corporation, 4650 Cushing Pkwy, Fremont, California 94538, USA
| | - Yoonsoo Rho
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720-1740, USA
| | - Matthew Eliceiri
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720-1740, USA
| | - Costas P Grigoropoulos
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, California 94720-1740, USA
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An JM, Kang EA, Han YM, Kim YS, Hong YG, Hah BS, Hong SP, Hahm KB. Dietary threonine prevented stress-related mucosal diseases in rats. J Physiol Pharmacol 2019; 70. [PMID: 31566193 DOI: 10.26402/jpp.2019.3.14] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 06/28/2019] [Indexed: 11/03/2022]
Abstract
Stress-related mucosal disease (SRMD), or stress ulceration, is a group of conditions ranging from stress-related superficial gastric mucosal damage to deep gastric ulcers that are primarily correlated with mucosal ischemia, and pharmacologic interventions that optimize tissue perfusion or preserve defensive mucus aim to decrease the occurrence of conditions, such as gastric acidity, or enhance gastric defenses. However, the identification of multifactorial pathogenesis may be effective in preventing SMRD, and the use of stress prophylaxis is generally preferred. Since threonine is a component in the polymerization and synthesis of gastric mucin and possibly enhanced defense actions and lignin may provide structural support for defense and antioxidative function, we hypothesized that dietary intake of threonine and/or lignin can enhance defense against SRMD. The water immersion-restraint stress (WIRS) was used in rats and additional groups were pretreated with threonine alone or the combination of threonine and lignin. Based on gross and microscopic evaluations, threonine alone or the combination of threonine and lignin, a natural antioxidant, significantly reduced the development of SRMD (P < 0.05). According to molecular explorations, the levels of inflammatory mediators, such as interleukin (IL)-8, IL-6, IL-1β, inducible nitric oxide synthase (iNOS), tumor necrosis factor alpha (TNF-α), and interferon gamma (IFN-γ), all of which are mediators that play a significant role in controlling WIRS, significantly decreased in the groups pretreated with either threonine alone or the combination of threonine and lignin (P < 0.01). WIRS significantly increased apoptosis in the stomach. However, the apoptotic index significantly decreased with threonine pretreatment. According to periodic acid Schiff staining results, the expression of gastric mucin was significantly preserved in groups pretreated with threonine but remarkedly decreased in the WIRS group. The gastric heme oxygenase-1 levels significantly increased in the group treated with threonine. In conclusion, the dietary intake of threonine or the combination of threonine and lignin is effective in preventing SRMD.
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Affiliation(s)
- J M An
- CHA Cancer Preventive Research Center, CHA Bio Complex, CHA University, Pangyo, Korea
| | - E A Kang
- CHA Cancer Preventive Research Center, CHA Bio Complex, CHA University, Pangyo, Korea
| | - Y M Han
- CHA Cancer Preventive Research Center, CHA Bio Complex, CHA University, Pangyo, Korea
| | - Y S Kim
- BIO Technical Marketing, CJ Cheiljedang Corporation, Seoul, Korea
| | - Y G Hong
- BIO Technical Marketing, CJ Cheiljedang Corporation, Seoul, Korea
| | - B S Hah
- BIO Technical Marketing, CJ Cheiljedang Corporation, Seoul, Korea
| | - S P Hong
- Digestive Disease Center, CHA University Bundang Medical Center, Seongnam, Korea
| | - K B Hahm
- CHA Cancer Preventive Research Center, CHA Bio Complex, CHA University, Pangyo, Korea. .,Digestive Disease Center, CHA University Bundang Medical Center, Seongnam, Korea
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Lee EH, Kim SJ, Ha EJ, Park ES, Choi JY, Leem AY, Kim SY, Park MS, Kim YS, Kang YA. Treatment of latent tuberculous infection among health care workers at a tertiary hospital in Korea. Int J Tuberc Lung Dis 2019; 22:1336-1343. [PMID: 30355414 DOI: 10.5588/ijtld.18.0280] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE To evaluate the acceptance of, adherence to, and outcomes of latent tuberculous infection (LTBI) treatment among health care workers (HCWs). DESIGN This was a retrospective study in a tertiary hospital in Korea. From May to August 2017, 2190 HCWs simultaneously underwent a tuberculin skin test (TST) and interferon-gamma release assay (IGRA). LTBI was diagnosed if the TST induration was 10 mm or IGRA results were positive. RESULTS Of 2190 HCWs tested, 1006 (45.9%) were diagnosed with LTBI. Of these, 655 (65.1%) HCWs visited out-patient clinics, 234 (35.7%) of whom were advised treatment by physicians. Among these, 120 (51.3%) accepted the physicians' recommendations. In general, HCWs who were older, male and smoked were less likely to visit out-patient clinics. Sixty (50%) HCWs received 3 months of isoniazid plus rifampicin (3HR) and 57 (47.5%) HCWs received 4 months of rifampicin (4R). The proportion of HCWs with 2 side effects (3HR 20% vs. 4R 7.0%, P = 0.041) and drug stoppage rate (3HR 20% vs. 4R 5.3%, P = 0.017) were higher in the 3HR group than in the 4R group. Of the 120 HCWs, 78 (65%) completed LTBI treatment. CONCLUSION Overall, the acceptance and completion rate for LTBI treatment was not adequate. For effective LTBI management in HCWs, further programmatic strategies are needed.
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Affiliation(s)
- E H Lee
- Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul
| | - S J Kim
- Infection Control Office, Severance Hospital, Seoul
| | - E J Ha
- Infection Control Office, Severance Hospital, Seoul
| | - E S Park
- Infection Control Office, Severance Hospital, Seoul
| | - J Y Choi
- Infection Control Office, Severance Hospital, Seoul, Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - A Y Leem
- Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul
| | - S Y Kim
- Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul
| | - M S Park
- Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul
| | - Y S Kim
- Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul
| | - Y A Kang
- Division of Pulmonology, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul
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Lee J, Lee Y, Kim YS, Choi JG, Go TH, Kim H, Cha YS. Serum ammonia as an early predictor of in-hospital mortality in patients with glufosinate poisoning. Hum Exp Toxicol 2019; 38:1007-1013. [DOI: 10.1177/0960327119855124] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Background: The mortality rate associated with human glufosinate poisoning is high. We evaluated the usefulness of serum ammonia and sequential organ failure assessment (SOFA) and acute physiology and chronic health evaluation II (APACHE II) scores for early prediction of in-hospital mortality in glufosinate ammonium poisoning. Methods: A prospectively collected pesticide poisoning registry at a single academic medical center was retrospectively analyzed. Data were collected from consecutive patients diagnosed with glufosinate ammonium poisoning between May 2007 and February 2018. The initial serum ammonia level was defined as the highest serum ammonia level measured within 12 h after emergency department (ED) arrival. The SOFA and APACHE II scores were calculated using data obtained within the first 12 h after ED arrival. The patients were divided into survivor and nonsurvivor groups by in-hospital death status. Results: In total, 110 patients were included. Ten patients (9.1%) died in the hospital despite treatment. Median initial serum ammonia level was significantly higher in the nonsurvivor group than in the survivor group (219 (range: 158–792) versus 100.5 (range: 25–317) µg/dL, p < 0.001). Median SOFA and APACHE II scores in the survivor and nonsurvivor groups were 2 (range: 0–10) versus 5 (range: 1–8) ( p = 0.044) and 7 (range: 0–28) versus 16 (range: 8–22) ( p = 0.001), respectively. In the multiple logistic regression analysis, the initial serum ammonia level was the only independent predictor (cutoff value: 151 µg/dL). Conclusion: An initial serum ammonia level >151 µg/dL was an independent early predictor of in-hospital mortality in glufosinate ammonium poisoning.
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Affiliation(s)
- J Lee
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Y Lee
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - YS Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - JG Choi
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - TH Go
- Center of Biomedical Data Science, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - H Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - YS Cha
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
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Won HS, Sun DS, Ko YH, You SH, Kim YS, Kim JS. Abstract P2-05-03: Clinical implication of APOBEC3A and 3B in Korean patients with breast cancer. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p2-05-03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Apolipoprotein B mRNA-editing enzyme, catalytic polypeptide-like (APOBEC) family is known to function in innate immune system that protects against retrovirus by deaminating cytosine to uracil in single-stranded DNA. APOBEC family has emerged as an endogenous mutator to contribute to the mutation burden in many cancers. We aimed to evaluate the expression of APOBEC3A (A3A), 3B (A3B) mRNA and APOBEC3A-3B deletion polymorphism in Korean breast cancer patients and investigate the correlation between their expression and clinicopathological characteristics.
Methods: One hundred thirty-eight patients who underwent surgery for breast cancer in Uijeongbu St. Mary's Hospital between January 2013 and December 2016 were evaluated. RNA and DNA were extracted from 138 breast cancer tissues and 10 adjacent normal breast tissues. The levels of A3A and A3B mRNA transcripts were determined using real-time quantitative PCR. Insertion and deletion PCR assays were performed to detect the APOBEC3A-3B deletion allele. Mutation hotspots in exon 2-11 of TP53 and exon 9/20 of PIK3CA were evaluated using direct sequencing method.
Results: The expression of A3B was increased in breast cancer tissues than in normal breast tissues. The median A3B mRNA expression levels in both triple-negative breast cancer and human epidermal growth factor 2-positive breast cancer were significantly higher than in hormone receptor-positive breast cancer. Old age and high ki-67 expression were associated with increased expression of A3A and A3B. Advanced stage, presence of lymph node involvement, and high histological grade were associated with increased expression of A3A. The APOBEC3B deletion allele was found in 78 (56%) tumor samples. There was no significant association between A3A, A3B mRNA levels and the presence of APOBEC3B deletion allele. There was no difference in clinicopathological characteristics according to the presence of APOBEC3B deletion allele except histological grade. The frequency of high histological grade was significantly higher in tumors with APOBEC3B deletion allele than tumors without APOBEC3B deletion allele. TP53 mutations were identified in 12 (8.7%) cases and PIK3CA mutations were identified in 31 (22.5%) cases. There were no significant differences in the levels of A3A and A3B mRNA expression by TP53 mutation status. The presence of a PIK3CA mutation was significantly associated with lower A3A expression.
Conclusions: The levels of A3B mRNA expression showed a difference according to breast cancer subtype, and triple-negative breast cancer showed the highest levels of A3B mRNA expression. The high levels of A3A and A3B mRNA expression were associated with an aggressive phenotype including high proliferation index. The APOBEC3A-3B deletion polymorphism was found in about half of the patients, but there was no difference in clinicopathological factors according to the presence of APOBEC3B deletion allele except histological grade.
Citation Format: Won HS, Sun DS, Ko YH, You SH, Kim YS, Kim JS. Clinical implication of APOBEC3A and 3B in Korean patients with breast cancer [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P2-05-03.
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Affiliation(s)
- HS Won
- College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - DS Sun
- College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - YH Ko
- College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - SH You
- College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - YS Kim
- College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - JS Kim
- College of Medicine, The Catholic University of Korea, Seoul, Korea
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Kim YS, Shim EJ, Lee JW, Cho J, Jung HK, Kim NH, Lee JE, Min J, Noh WC, Park SH. Abstract P1-08-21: Association of depression and anxiety disorder with the risk of mortality in breast cancer: A national health insurance service study in South Korea. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p1-08-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
PURPOSE: To examine whether depression, anxiety disorder and their co-occurrence would increase the risk of mortality in patients with breast cancer, and whether antidepressant treatment would reduce the same.
PATIENTS AND METHODS: Data were retrieved from the database of the Korean National Health Insurance Service. Of 145,251 patients diagnosed with breast cancer between 2007 and 2014, 20,870 patients diagnosed with depression or anxiety disorder one year before breast cancer diagnosis were excluded. Thus, data of 124,381 patients were included in this study.
RESULTS: Anxiety disorder was more prevalent than depression in patients with breast cancer, and similar factors were associated with both depression and anxiety disorder. Overall, female sex, older age, residence in metropolitan areas, lower income, higher comorbidity, carcinoma in situ, and the receipt of any type of cancer therapies were associated with an increased risk of depression or anxiety disorder. Depression and anxiety disorder were associated with an increased risk of mortality (Hazard Ratio (HR) = 1.26, 95% CI=1.18–1.36; HR=1.14, 95% CI=1.08–1.22, respectively) and their co-occurrence further increased the risk (HR=1.38, 95% CI=1.24–1.54). Antidepressant treatment was related to a reduced risk of mortality. Compared to patients with no depression, among those with depression, the risk of mortality was 2.18 times higher (95% CI=1.69–2.81) in patients who did not receive antidepressant treatment and 1.25 times higher (95% CI =1.17–1.32) in those who received antidepressant treatment.
CONCLUSION: The current findings suggest that psychiatric comorbidities are markers of increased mortality risk in patients with breast cancer. This underscores the need for screening and treating depression and anxiety disorders to improve survival in breast cancer.
Citation Format: Kim YS, Shim E-J, Lee JW, Cho J, Jung HK, Kim NH, Lee JE, Min J, Noh WC, Park S-H. Association of depression and anxiety disorder with the risk of mortality in breast cancer: A national health insurance service study in South Korea [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P1-08-21.
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Affiliation(s)
- YS Kim
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - E-J Shim
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - JW Lee
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - J Cho
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - HK Jung
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - NH Kim
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - JE Lee
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - J Min
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - WC Noh
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - S-H Park
- Chosun University College of Medicine, Gwangju, Republic of Korea; Pusan National University, Busan, Republic of Korea; University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea; Keimyung University School of Medicine, Daegu, Republic of Korea; Seran General Hospital, Seoul, Republic of Korea; Kaywon University of Art and Design, Uiwang-si, Republic of Korea; Seoul National University, Seoul, Republic of Korea; Dankook University College of Medicine, Cheonan, Republic of Korea; Korea Institute of Radiology and Medical Science, Korea Cancer Center Hospital, Seoul, Republic of Korea; Daegu Catholic University Medical Center, Daegu, Republic of Korea
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Lee KH, Han SH, Yong D, Paik HC, Lee JG, Kim MS, Joo DJ, Choi JS, Kim SI, Kim YS, Park MS, Kim SY, Yoon YN, Kang S, Jeong SJ, Choi JY, Song YG, Kim JM. Acquisition of Carbapenemase-Producing Enterobacteriaceae in Solid Organ Transplantation Recipients. Transplant Proc 2019; 50:3748-3755. [PMID: 30577266 DOI: 10.1016/j.transproceed.2018.01.058] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 01/23/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Carbapenemase-producing Enterobacteriaceae (CPE) can lead to life-threatening outcomes with rapid spread of the carbapenemase gene in solid organ transplantation (SOT) recipients because of limitations of available antibiotics. We examined the characteristics and importance of CPE acquisition in SOT recipients with large numbers of CPE isolates. METHODS Between November 2015 and October 2016, 584 CPE isolates were found in 37 recipients and verified by carbapenemase gene multiplex polymerase chain reaction (PCR). One hundred recipients with at least 2 negative results in carbapenemase PCR for stool surveillance and no CPE isolates in clinical samples were retrospectively included. RESULTS Most CPE isolates were Klebsiella pneumoniae carbapenemase (KPC)-producing K. pneumoniae (546, 93.5%). The most frequent transplantation organ was lung (43.3%), and the most common sample with CPE isolates other than stool was respiratory tract (22.6%). The median time between SOT and first CPE acquisition was 7 days. All-cause mortality was significantly higher in recipients with CPE than in those without CPE (24.3% vs 10.0%; P = .03). In multivariate regression analysis, stool colonization of vancomycin-resistant Enterococci and/or Clostridium difficile during 30 days before SOT (odds ratio [OR], 3.28; 95% CI, 1.24-8.68; P = .02), lung transplantation (OR, 4.50; 95% CI, 1.19-17.03; P = .03), and intensive care unit stay ≥2 weeks (OR, 6.21; 95% CI, 1.72-22.45; P = .005) were associated with acquisition of CPE. CONCLUSIONS Early posttransplantation CPE acquisition may affect the clinical outcome of SOT recipients. Careful screening for CPE during the early posttransplantation period would be meaningful in recipients with risk factors.
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Affiliation(s)
- K H Lee
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - S H Han
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
| | - D Yong
- Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - H C Paik
- Department of Thoracic and Cardiovascular Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J G Lee
- Department of Thoracic and Cardiovascular Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - M S Kim
- Department of Transplantation Surgery and Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - D J Joo
- Department of Transplantation Surgery and Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J S Choi
- Department of Transplantation Surgery and Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - S I Kim
- Department of Transplantation Surgery and Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Y S Kim
- Department of Transplantation Surgery and Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - M S Park
- Division of Pulmonology and Critical Care Medicine, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - S Y Kim
- Division of Pulmonology and Critical Care Medicine, Department of Internal Medicine, Institute of Chest Diseases, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Y N Yoon
- Department of Cardiothoracic Surgery, Cardiovascular Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - S Kang
- Division of Cardiology, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - S J Jeong
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J Y Choi
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Y G Song
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - J M Kim
- Division of Infectious Disease, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
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Lee JS, An JM, Kang EA, Han YM, Kim YS, Lee HJ, Kim KJ, Surh YJ, Hahm KB. Host nuclear factor erythroid 2-related factor-2 defense system determines the outcome of dextran sulfate sodium-induced colitis in mice. J Physiol Pharmacol 2019; 69. [PMID: 30683827 DOI: 10.26402/jpp.2018.5.10] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 10/30/2018] [Indexed: 11/03/2022]
Abstract
Administration of dextran sulfate sodium (DSS) in drinking water led to significant bout of colitis simulating ulcerative colitis of human. However, colitis usually developed 5 - 7 days after DSS administration. Therefore, we hypothesized host defense system might protect colitis up to 5 days of DSS administration. 2.5% DSS-induced colitis were administered to C57BL/6 mice and sequential measurements of pathology, cyclooxygenase-2 (COX-2), nuclear factor-κB (NF-κB), heme oxygenase-1 (HO-1), NADPH quinone oxidoreductase-1 (NQO1), γ-glutamylcysteine synthetase (γ-GCS), nuclear factor erythroid 2-related factor-2 (Nrf2), and keap1 were done at 2, 6, 12, 24, 48, 96, 120, and 168 hour of DSS administration, respectively. DSS-induced colitis was repeated in either COX-2-/- or Nrf2-/- mice. On serial pathological analysis, significant colitis was noted after 120 h of DSS administration, during which both activations of COX-2/NF-κB and HO-1/Nrf2 were noted. Nrf2 activations after keap1 inactivation led to significant increases in HO-1 after 168 hours of DSS administration, when NF-κB nuclear translocation was noted. Significantly attenuated colitis was noted in DSS-challenged COX-2-/- mice, in which the levels of HO-1 were significantly decreased compared to DSS-challenged WT littermates (p < 0.01), while the levels of NQO1 were significantly increased. On DSS administration to Nrf2-/- mice, colitis was significantly aggravated (p < 0.01), in which the expressions of COX-2 as well as expressions of HO-1 and γ-GCS were significantly increased (p < 0.01). Reciprocal activations of inflammatory and antioxidative defense signaling after DSS administration might be prerequisite to make intestinal homeostasis and host defense Nrf2 system can determine colitis.
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Affiliation(s)
- J S Lee
- Jeonju University, College of Biotechnology and Functional Foods, Jeonju, Korea
| | - J M An
- CHA Cancer Prevention Research Center, CHA Bio Complex, Pangyo, Korea
| | - E A Kang
- CHA Cancer Prevention Research Center, CHA Bio Complex, Pangyo, Korea
| | - Y M Han
- CHA Cancer Prevention Research Center, CHA Bio Complex, Pangyo, Korea
| | - Y S Kim
- Department of Biochemistry and Molecular Biology, Hanyang University School of Medicine, Seoul, Korea
| | - H J Lee
- Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Korea
| | - K-J Kim
- Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
| | - Y J Surh
- College of Pharmacy, Seoul National University, Seoul, Korea
| | - K-B Hahm
- CHA Cancer Prevention Research Center, CHA Bio Complex, Pangyo, Korea. .,Digestive Disease Center, CHA University Bundang Medical Center, Seongnam, Korea
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Kim YS, Kim Y, Choi JW, Oh HE, Lee JH. Genetic variants and risk of prostate cancer using pathway analysis of a genome-wide association study. Neoplasma 2019; 63:629-34. [PMID: 27268928 DOI: 10.4149/neo_2016_418] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study explored candidate causal single nucleotide polymorphisms (SNPs) to clarify the biological mechanism of prostate cancer (PCa). Identify candidate Causal SNPs and Pathways (ICSNPathway) analysis was applied using a PCa genome-wide association study (GWAS) dataset that included 473,736 SNPs in 1151 cases of PCa and 1156 controls of European ancestry. Five candidate causal SNPs, three candidate causal genes, and two candidate causal pathways were identified using integrating linkage disequilibrium analysis, functional SNP annotation, and pathway-based analysis. The ICSNPathway analysis suggested three hypothetical mechanisms of PCa. The first was rs13112390, rs13112358, rs2048074 to nei-like DNA glycosylase 3 (NEIL3) gene to damaged DNA binding. The second was rs3087386 to REV1, DNA directed polymerase (REV1) gene to damaged DNA binding. The third was rs1063134 to potassium channel, inwardly rectifying subfamily J, member 4 (KCNJ4) gene to inward rectifier potassium channel activity.
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Kim YS, Kim JJ, Park SI, Diamond S, Boyd JS, Taton A, Kim IS, Golden JW, Yoon HS. Expression of OsTPX Gene Improves Cellular Redox Homeostasis and Photosynthesis Efficiency in Synechococcus elongatus PCC 7942. Front Plant Sci 2018; 9:1848. [PMID: 30619416 PMCID: PMC6297720 DOI: 10.3389/fpls.2018.01848] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 11/28/2018] [Indexed: 06/09/2023]
Abstract
Cyanobacterial 2-Cys peroxiredoxin (thioredoxin peroxidase, TPX) comprises a family of thiol antioxidant enzymes critically involved in cell survival under oxidative stress. In our previous study, a putative TPX was identified using a proteomics analysis of rice (Oryza sativa L. japonica, OsTPX) seedlings exposed to oxidative stress. This OsTPX gene is structurally similar to the Synechococcus elongatus TPX gene in the highly conserved redox-active disulfide bridge (Cys114, Cys236) and other highly conserved regions. In the present study, the OsTPX gene was cloned into rice plants and S. elongatus PCC 7942 strain to study hydrogen peroxide (H2O2) stress responses. The OsTPX gene expression was confirmed using semi-quantitative RT-PCR and western blot analysis. The OsTPX gene expression increased growth under oxidative stress by decreasing reactive oxygen species and malondialdehyde level. Additionally, the OsTPX gene expression in S. elongatus PCC 7942 (OT) strain exhibited a reduced loss of chlorophyll and enhanced photosynthesis efficiency under H2O2 stress, thereby increasing biomass yields twofold compared with that of the control wild type (WT) strain. Furthermore, redox balance, ion homeostasis, molecular chaperone, and photosynthetic systems showed upregulation of some genes in the OT strain than in the WT strain by RNA-Seq analysis. Thus, OsTPX gene expression enhances oxidative stress tolerance by increasing cell defense regulatory networks through the cellular redox homeostasis in the rice plants and S. elongatus PCC 7942.
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Affiliation(s)
- Young-Saeng Kim
- Research Institute of Ulleung-do and Dok-do, Kyungpook National University, Daegu, South Korea
| | - Jin-Ju Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Seong-Im Park
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Spencer Diamond
- Division of Biological Sciences, San Diego, La Jolla, CA, United States
| | - Joseph S. Boyd
- Division of Biological Sciences, San Diego, La Jolla, CA, United States
| | - Arnaud Taton
- Division of Biological Sciences, San Diego, La Jolla, CA, United States
| | - Il-Sup Kim
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, South Korea
| | - James W. Golden
- Division of Biological Sciences, San Diego, La Jolla, CA, United States
| | - Ho-Sung Yoon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, South Korea
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Lee Y, Kim SJ, Kim YS, Kim H, Lee DK, Lee J, Go TH, Cha YS. The usefulness of the SOFA and APACHE II scoring systems for the early prediction of mortality in patients with dapsone poisoning. Hum Exp Toxicol 2018; 38:280-287. [DOI: 10.1177/0960327118806647] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The rate of mortality from dapsone poisoning is high because of the long absorption half-life of dapsone. This study aimed to evaluate the usefulness of the sequential organ failure assessment (SOFA) and acute physiology and chronic health evaluation II (APACHE II) scoring systems for the early prediction of mortality in patients with dapsone poisoning. This is a retrospective and observational study of consecutive patients diagnosed with dapsone poisoning. The SOFA and APACHE II scores were obtained within the first 24 h of admission. Patients were divided into survivor and non-survivor groups. In total, 106 patients were included. The SOFA scores of the survivor and non-survivor groups were 1 (0–8) and 4 (1–10), respectively ( p < 0.001). The APACHE II scores of the survivor and non-survivor groups were 9 (1–25) and 14 (3–23), respectively ( p < 0.001). Based on these scores and in-hospital mortality cases, the standardized mortality ratios for the APACHE II and SOFA were 1.00 (95% confidence interval (CI): 0.64–1.48) and 1.00 (95% CI: 0.64–1.49), respectively. In the model adjusted for clinically important variables and variables with significant differences between the survivor and non-survivor groups, the area under the curve of the SOFA (0.907; 95% CI: 0.834–0.955) was significantly higher than that of the APACHE II (0.793; 95% CI: 0.703–0.867) ( p = 0.008). The SOFA and APACHE II score systems had good discrimination and satisfactory calibration performance in patients with dapsone poisoning. However, the SOFA score was a more useful method in predicting mortality than the APACHE II score.
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Affiliation(s)
- Y Lee
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - SJ Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - YS Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - H Kim
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - DK Lee
- Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - J Lee
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - TH Go
- Center of Biomedical Data Science, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - YS Cha
- Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
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Lee SG, Yoo JW, Kim YS. Calibration methods of X-ray imaging crystal spectrometer on KSTAR. Rev Sci Instrum 2018; 89:10F108. [PMID: 30399801 DOI: 10.1063/1.5034023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 06/06/2018] [Indexed: 06/08/2023]
Abstract
The detailed calibration methods and procedure for the X-ray imaging crystal spectrometer (XICS) in the Korea Superconducting Tokamak Advanced Research device are investigated. A cross comparison from two different diagnostics including the XICS and charge exchange spectrometer is the best option, in particular, when both systems can be operated simultaneously.
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Affiliation(s)
- S G Lee
- National Fusion Research Institute, Daejeon, South Korea
| | - J W Yoo
- National Fusion Research Institute, Daejeon, South Korea
| | - Y S Kim
- National Fusion Research Institute, Daejeon, South Korea
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Yoon YE, Lee HH, Na JC, Huh KH, Kim MS, Kim SI, Kim YS, Han WK. Impact of Cigarette Smoking on Living Kidney Donors. Transplant Proc 2018; 50:1029-1033. [PMID: 29731061 DOI: 10.1016/j.transproceed.2018.02.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 02/17/2018] [Accepted: 02/22/2018] [Indexed: 01/23/2023]
Abstract
BACKGROUND Smoking is known to result in a decline in renal allograft function and survival of recipients; however, the effect of smoking on living kidney donors remains unknown. In this study we evaluated the impact of cigarette smoking on renal function of kidney donors. METHODS Among 1056 donors who underwent nephrectomy, 612 completed the 6-month follow-up protocol and were enrolled in the study. The association of smoking status, including pack-years smoking history, and postoperative renal function was evaluated. RESULTS Among donors, 68.1% had never smoked, 8% were former smokers, and 23.9% were current smokers. Donors who never smoked were older than former and current smokers (42.3 ± 11.8, 41.9 ± 11.1, and 38.3 ± 10.9 years, respectively; P < .001). There was no difference in preoperative renal function between groups; however, postoperative estimated glomerular filtration rate (eGFR) was lower in former and current smokers than in those who never smoked (64.6 ± 13.8, 64.7 ± 12.3, and 67.8 ± 13.1 mL/min/1.73 m2, respectively; P = .023). In former and current smokers, pack-years smoking history was negatively associated with pre- and postoperative eGFR (r = -0.305 and -0.435, P < .001), and correlated with postoperative percent eGFR decline (r = 0.248, P < .001). Smoking history was associated with postoperative development of chronic kidney disease (CKD). Especially in former smokers, a smoking history of more than 12 pack-years was strongly associated with development of CKD (odds ratio = 7.5, P = .003). CONCLUSION Even if they no longer smoke, donors with a smoking history require close observation due to increased risk of CKD development after kidney donation. A detailed pack-years smoking history should be obtained, and smoking cessation strategies should be implemented in kidney donors.
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Affiliation(s)
- Y E Yoon
- Department of Urology, Hanyang University College of Medicine, Seoul, Korea
| | - H H Lee
- Department of Urology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - J C Na
- Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea
| | - K H Huh
- Department of Transplantation Surgery, Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Korea
| | - M S Kim
- Department of Transplantation Surgery, Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Korea
| | - S I Kim
- Department of Transplantation Surgery, Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Korea
| | - Y S Kim
- Department of Transplantation Surgery, Research Institute for Transplantation, Yonsei University College of Medicine, Seoul, Korea
| | - W K Han
- Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
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Kim J, Choi SE, Lim BJ, Kim YS, Huh KH, Lee J, Kim SI, Kim MS, Jeong HJ. Clinical Significance of Macrophage Polarization in Antibody-Mediated Rejection of Renal Allograft. Transplant Proc 2018; 50:1005-1008. [PMID: 29731056 DOI: 10.1016/j.transproceed.2018.02.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 02/05/2018] [Accepted: 02/19/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND The significance of proinflammatory M1 (classically activated) and profibrotic M2 (alternatively activated) macrophages in antibody-mediated rejection (ABMR) after kidney transplantation has not been investigated. METHODS Fifty-five biopsy-confirmed ABMR samples were stained with MRP 8/14 (a marker of M1 macrophages) and CD163 (a marker of M2 macrophages), and positive cells were counted in glomeruli and the tubulointerstitium, respectively. Patients were classified into M1 and M2 polarization groups according to the glomerular and tubulointerstitial M1:M2 ratio, and the results were compared with Banff scores, serum creatinine level, estimated glomerular filtration rate (eGFR), and graft survival. RESULTS The glomerular M2 polarization group showed significantly higher chronic glomerulopathy scores, serum creatinine levels, and lower eGFR at the time of biopsy (P = .019 and P = .015, respectively) and 3-month postbiopsy (P = .016 and P = .032, respectively) than the M1 polarization group. The tubulointerstitial M2 polarization group had significantly lower glomerulitis, arteritis, peritubular capillaritis, and glomerulitis + peritubular capillaritis scores than the M1 polarization group, but there was no significant difference in renal function. Long-term graft survival was not associated with macrophage polarization. CONCLUSION Glomerular M2 polarization in ABMR biopsy samples is associated with chronic glomerular injury and poorer graft function, but without graft survival.
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Affiliation(s)
- J Kim
- Department of Pathology, Yonsei University College of Medicine, Seoul, Korea
| | - S-E Choi
- Department of Pathology, Yonsei University College of Medicine, Seoul, Korea
| | - B J Lim
- Department of Pathology, Yonsei University College of Medicine, Seoul, Korea
| | - Y S Kim
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - K H Huh
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - J Lee
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - S I Kim
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - M S Kim
- Department of Transplantation Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - H J Jeong
- Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
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47
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Kim KJ, Park JM, Lee JS, Kim YS, Kangwan N, Han YM, Kang EA, An JM, Park YK, Hahm KB. Oligonol prevented the relapse of dextran sulfate sodium-ulcerative colitis through enhancing NRF2-mediated antioxidative defense mechanism. J Physiol Pharmacol 2018; 69. [PMID: 30149369 DOI: 10.26402/jpp.2018.3.03] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 06/30/2018] [Indexed: 11/03/2022]
Abstract
Repeated bouts of ulcerative colitis featured troublesome course of inflammatory bowel disease leading to fatal colitis-associated cancer, which is strongly associated with oxidative stress and sustained inflammation. Since oligonol, low molecular weighted polyphenol extracted from fruit lychee, showed antioxidative and anti-inflammatory actions, we hypothesized that oligonolcan prevent relapse of colitis. We compared oligonol with current gold standard therapeutics, sulfasalazine in preventive efficacy of relapse. First, dextran sulfate sodium (DSS)-induced colitis were made following pretreatment with oligonol, 10, 50, and 100 mg/kg for 7 days to measure therapeutic effect of oligonol and relapse model via repeated DSS administration was made following with either 50 mg/kg oligonol or 30 mg/kg sulfasalazine to explore relapse preventing action of oligonol in C57BL/6 mice. Detailed changes in colon were measured to explain molecular mechanisms. Pretreatment of 10, 50, 100 mg/kg oligonol (p.o.), significantly reduced DSS-induced colitis; total pathologic scores, colon length, and clinical symptom scores (P < 0.05). Oligonol pretreatment significantly decreased the levels of interleukin (IL)-1, IL-6, and tumor necrosis factor-α (TNF-α) as well as nuclear factor-κB (NF-κB), c-Fos, and c-Jun in affected colon tissues, but the expression of heme oxygenase-1 (HO-1) and NADH: quinone oxidoreductase-1(NQO-1) as well as total antioxidant concentration (P < 0.005) was significantly increased with oligonol. A relapse model established with repeated DSS administration led to high mortality. However, oligonol significantly ameliorated exacerbations of colitis, while sulfasalazine did not (P < 0.01). Significantly decreased expressions of cyclooxygenase-2 (COX-2), TNF-α, and macrophages inhibition were relapse preventing actions of oligonal, but significant action of oligonol relevant to relapse prevention was either significantly increased expressions of NQO-1 or significantly preserved mucin (P < 0.05). Concerted anti-inflammatory, antioxidative, and host defense enhancing actions of oligonol can be applied during maintenance therapy of IBD to prevent relapse of IBD.
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Affiliation(s)
- K-J Kim
- Department of Gastroenterology, University of Ulsan Asan Medical Center, Seoul, Korea
| | - J-M Park
- Department of Pharmacology, Daejeon University School of Oriental Medicine, Daejeon, Korea
| | - J-S Lee
- Department of Biotechnology and Functional Food, Jeonju University, Cheonju, Korea
| | - Y S Kim
- Department of Biochemistry and Molecular Biology, Hanyang University School of Medicine, Seoul, Korea
| | | | - Y-M Han
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - E A Kang
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - J M An
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - Y K Park
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - K-B Hahm
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea. .,Digestive Disease Center, CHA University Bundang Medical Center, Seongnam, Korea
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48
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Hwang KW, Choi JH, Jung SM, Kim YS, Lee SY, Chon MK, Lee SH, Kim JS, Park YH, Kim JH, Chun KJ, Je HG, Lee SK, Choi HO. P1520Defining the blanking period after maze procedure for atrial fibrillation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- K W Hwang
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - J H Choi
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - S M Jung
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - Y S Kim
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - S Y Lee
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - M K Chon
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - S H Lee
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - J S Kim
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - Y H Park
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - J H Kim
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - K J Chun
- Pusan National University Yangsan Hospital, Division of Cardiology, Department of Internal Medicine, Yansan, Korea Republic of
| | - H G Je
- Pusan National University Yangsan Hospital, Department of Cardiovascular and Thoracic Surgery, Yansan, Korea Republic of
| | - S K Lee
- Pusan National University Yangsan Hospital, Department of Cardiovascular and Thoracic Surgery, Yansan, Korea Republic of
| | - H O Choi
- Soonchunhyang University Hospital, Cardiology, Bucheon, Korea Republic of
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49
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Kim YS, Hwang KW, Choi HO, Jung SM, Choi JH, Lee SY, Chun MK, Lee SH, Kim JS, Je HG, Park YH, Kim JH, Lee SK, Chun KJ. P4815Incidence of incomplete surgical left atrial appendage closure. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Y S Kim
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - K W Hwang
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - H O Choi
- Soonchunhyang University Hospital, Department of internal medicine, Bucheon, Korea Republic of
| | - S M Jung
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - J H Choi
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - S Y Lee
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - M K Chun
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - S H Lee
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - J S Kim
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - H G Je
- Pusan National University, Department of Cardiovascular and Thoracic Surgery, Yangsan, Korea Republic of
| | - Y H Park
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - J H Kim
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
| | - S K Lee
- Pusan National University, Department of Cardiovascular and Thoracic Surgery, Yangsan, Korea Republic of
| | - K J Chun
- Pusan National University Yangsan Hospital, Department of internal medicine, Yangsan-si, Korea Republic of
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50
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Truijen J, Rasmussen LS, Kim YS, Stam J, Stok WJ, Pott FC, van Lieshout JJ. Cerebral autoregulatory performance and the cerebrovascular response to head-of-bed positioning in acute ischaemic stroke. Eur J Neurol 2018; 25:1365-e117. [PMID: 29935041 PMCID: PMC6220945 DOI: 10.1111/ene.13737] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Accepted: 06/19/2018] [Indexed: 11/28/2022]
Abstract
Background and purpose Cerebrovascular responses to head‐of‐bed positioning in patients with acute ischaemic stroke are heterogeneous, questioning the applicability of general recommendations on head positioning. Cerebral autoregulation is impaired to various extents after acute stroke, although it is unknown whether this affects cerebral perfusion during posture change. We aimed to elucidate whether the cerebrovascular response to head position manipulation depends on autoregulatory performance in patients with ischaemic stroke. Methods The responses of bilateral transcranial Doppler ultrasound‐determined cerebral blood flow velocity (CBFV) and local cerebral blood volume (CBV), assessed by near‐infrared spectroscopy of total hemoglobin tissue concentration ([total Hb]), to head‐of‐bed lowering from 30° to 0° were determined in 39 patients with acute ischaemic stroke and 17 reference subjects from two centers. Cerebrovascular autoregulatory performance was expressed as the phase difference of the arterial pressure‐to‐CBFV transfer function. Results Following head‐of‐bed lowering, CBV increased in the reference subjects only ([total Hb]: + 2.1 ± 2.0 vs. + 0.4 ± 2.6 μM; P < 0.05), whereas CBFV did not change in either group. CBV increased upon head‐of‐bed lowering in the hemispheres of patients with autoregulatory performance <50th percentile compared with a decrease in the hemispheres of patients with better autoregulatory performance ([total Hb]: +1.0 ± 1.3 vs. −0.5 ± 1.0 μM; P < 0.05). The CBV response was inversely related to autoregulatory performance (r = −0.68; P < 0.001) in the patients, whereas no such relation was observed for CBFV. Conclusion This study is the first to provide evidence that cerebral autoregulatory performance in patients with acute ischaemic stroke affects the cerebrovascular response to changes in the position of the head.
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Affiliation(s)
- J Truijen
- Department of Internal Medicine, Waterlandziekenhuis, Purmerend.,Medical Biology, Laboratory for Cardiovascular Physiology, AMC Center for Heart Failure Research, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - L S Rasmussen
- Bispebjerg Hospital Research Unit for Anesthesia and Intensive Care, University of Copenhagen, Copenhagen, Denmark
| | - Y S Kim
- Medical Biology, Laboratory for Cardiovascular Physiology, AMC Center for Heart Failure Research, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Nephrology, VU University Medical Center, Amsterdam
| | - J Stam
- Stroke Unit, Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam
| | - W J Stok
- Medical Biology, Laboratory for Cardiovascular Physiology, AMC Center for Heart Failure Research, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - F C Pott
- Bispebjerg Hospital Research Unit for Anesthesia and Intensive Care, University of Copenhagen, Copenhagen, Denmark
| | - J J van Lieshout
- Medical Biology, Laboratory for Cardiovascular Physiology, AMC Center for Heart Failure Research, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,MRC/ARUK Centre for Musculoskeletal Ageing Research, School of Life Sciences, The Medical School, Queen's Medical Centre, University of Nottingham Medical School, Nottingham, UK
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