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Different oncological features of colorectal cancer codon-specific KRAS mutations:Not codon 13 but codon 12 have prognostic value

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World Journal of Gastroenterology 2023年第32期29卷 4883-4899页

作者： Hong-Min ahn Duck-Woo Kim Tae Gyun Lee Hye-rim Shin In Jun Yang Jeehye Lee Jung Wook Suh Heung-Kwon Oh Sung-Bum Kang Department of Surgery Seoul National University Bundang HospitalSeongnam 13620South Korea Department of Pathology Seoul National University Bundang HospitalSeongnam 13620South Korea Department of Pathology Seoul National University HospitalSeoul 03080South Korea

BACKGROUND Approximately 40%of colorectal cancer(CRC)cases are linked to Kirsten rat sarcoma viral oncogene homolog(KRAS)*** mutations are associated with poor CRC prognosis,especially KRAS codon 12 mutation,which is associated with metastasis and poorer ***,the clinicopathological characteristics and prognosis of KRAS codon 13 mutation in CRC remain *** To evaluate the clinicopathological characteristics and prognostic value of codonspecific KRAS mutations,especially in codon *** This retrospective,single-center,observational cohort study included patients who underwent surgery for stage I-III CRC between January 2009 and December *** with KRAS mutation status confirmed by molecular pathology reports were *** relationships between clinicopathological characteristics and individual codon-specific KRAS mutations were *** data were analyzed to identify codon-specific KRAS mutations as recurrence-related factors using the Cox proportional hazards regression *** Among the 2203 patients,the incidence of KRAS codons 12,13,and 61 mutations was 27.7%,9.1%,and 1.3%,*** KARS codons 12 and 13 mutations showed a tendency to be associated with clinical characteristics,but only codon 12 was associated with pathological features,such as stage of primary tumor(T stage),lymph node involvement(N stage),vascular invasion,perineural invasion,tumor size,and microsatellite *** codon 13 mutation showed no associations(77.2%vs 85.3%,P=0.159),whereas codon 12 was associated with a lower 5-year recurrence-free survival rate(78.9%vs 75.5%,P=0.025).In multivariable analysis,along with T and N stages and vascular and perineural invasion,only codon 12(hazard ratio:1.399;95%confidence interval:1.034-1.894;P=0.030)among KRAS mutations was an independent risk factor for *** This study provides evidence that KRAS codon 13 mutation is less likely to serve as a prognostic biom

关键词： Genes Ras Codon Colonic neoplasms Rectal neoplasms

Activation of immediate-early response gene c-Fos protein in the rat paralimbic cortices after myocardial infarction

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Neural Regeneration Research 2015年第8期10卷 1251-1257页

作者： Ji Yun ahn Hyun-Jin Tae Jeong-Hwi Cho In Hye Kim Ji Hyeon ahn Joon ha Park Dong Won Kim Jun Hwi Cho Moo-Ho Won Seongkweon Hong Jae-Chul Lee Jeong Yeol Seo Department of Emergency Medicine Sacred Heart Hospital College of Medicine Hallym University Department of Emergency Medicine School of Medicine Kangwon National University Department of Biomedical Science and Research Institute for Bioscience and Biotechnology Hallym University Department of Neurobiology School of Medicine Kangwon National University Department of Emergency Medicine Chuncheon Sacred Heart Hospital College of Medicine Hallym University Department of Surgery School of Medicine Kangwon National University

c-Fos is a good biological marker for detecting the pathogenesis of central nervous system disorders. Few studies are reported on the change in myocardial infarction-induced c-Fos expression in the paralimbic regions. Thus, in this study, we investigated the changes in c-Fos expression in the rat cingulate and piriform cortices after myocardial infarction. Neuronal degeneration in cingulate and piriform cortices after myocardial infarction was detected using cresyl violet staining, Neu N immunohistochemistry and Fluoro-Jade B histofluorescence staining. c-Fos-immunoreactive cells were observed in cingulate and piriform cortices at 3 days after myocardial infarction and peaked at 7 and 14 days after myocardial infarction. But they were hardly observed at 56 days after myocardial infarction. The chronological change of c-Fos expression determined by western blot analysis was basically the same as that of c-Fos immunoreactivity. These results indicate that myocardial infarction can cause the chronological change of immediate-early response gene c-Fos protein expression, which might be associated with the neural activity induced by myocardial infarction.

关键词： nerve regeneration paralimbic cortices myocardial infarction c-Fos cingulate cortex piriform cortex immunohistochemistry western analysis neural regeneration

Graphene-based catalysts for electrochemical carbon dioxide reduction

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Carbon Energy 2020年第2期2卷 158-175页

作者： Amirhossein hasani Mahider Asmare Teklagne ha Huu Do Sung Hyun Hong Quyet Van Le Sang Hyun ahn Soo Young Kim School of Chemical Engineering and Materials Science Integrative Research Center for Two-Dimensional Functional MaterialsInstitute of Interdisciplinary Convergence ResearchChung-Ang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Institute of Research and Development Duy Tan UniversityDa NangVietnam

Electrochemical carbon dioxide(CO2)reduction is considered to be an efficient strategy to produce usable fuels and overcome the concerns regarding global *** this purpose,an efficient,earth abundant,and a low cost catalyst has to be *** has been found that graphene-based materials could be promising candidates for CO2 conversion because of their unique physical,mechanical,and electronic *** addition,the surface of graphenebased materials can be modified by using different strategies,including doping,defect engineering,producing composite structures,and wrapping *** this review,the fundamentals of electrochemical CO2 reduction and recent progress of graphene-based catalysts are ***,recent studies on graphene-based materials for CO2 reduction are summarized.

关键词： catalyst CO2 reduction electrochemical graphene

Feasibility of ABO-incompatible adult living donor liver transplantation for acute-on-chronic liver failure

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Hepatobiliary & Pancreatic Diseases International 2017年第6期16卷 662-664页

作者： Seok-Hwan Kim Gi-Won Song Shin Hwang Chul-Soo ahn Deok-Bog Moon Tae-Yong ha Sung-Gyu Lee Division of Hepatobiliary Surgery and Liver Transplantation Department of Surgery Asan Medical Center University of Ulsan College of Medicine Seoul 05505 Korea

To the Editor:In Korea,the annual number of deceased donors for or gan transplantation per million people is still less ***,approximately 40%of patients with acute liver failure or acute-on-chronic liver failure undergo living donor liver transplantation（LDLT）.;Although the use of ABO-incompatible（ABOi）living donors is an attrac tive option,ABOi LDLT has very restricted applications

关键词： ABO Feasibility of ABO-incompatible adult living donor liver transplantation for acute-on-chronic liver failure RIT

Enhanced third-harmonic generation by manipulating the twist angle of bilayer graphene

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Light(Science & Applications) 2021年第2期10卷 176-185页

作者： Seongju ha Nam Hun Park Hyeonkyeong Kim Jiseon Shin Jungseok Choi Sungmin Park Ji-Yun Moon Kwanbyung Chae Jeil Jung Jae-Hyun Lee Youngdong Yoo Ji-Yong Park Kwang Jun ahn Dong-Il Yeom Department of Energy Systems Research Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Korea Research Institute of Standards and Science Daejeon 34113Republic of Korea Department of Physics University of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Smart Cities University of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Materials Science and Engineering Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of Chemistry Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of Physics Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea

Twisted bilayer graphene(tBLG)has received substantial attention in various research fields due to its unconventional physical properties originating from Moire *** electronic band structure in tBLG modified by interlayer interactions enables the emergence of low-energy van Hove singularities in the density of states,allowing the observation of intriguing features such as increased optical conductivity and photocurrent at visible or near-infrared ***,we show that the third-order optical nonlinearity can be considerably modified depending on the stacking angle in *** third-harmonic generation(THG)efficiency is found to significantly increase when the energy gap at the van Hove singularity matches the three-photon resonance of incident *** study on electrically tuneable optical nonlinearity reveals that the gate-controlled THG enhancement varies with the twist angle in tBLG,resulting in a THG enhanced up to 60 times compared to neutral monolayer *** results prove that the twist angle opens up a new way to control and increase the optical *** tBLG,,suggesting rotation-induced tuneable nonlinear optics in stacked two-dimensional material systems.

关键词： twist angle harmonic

Monocarboxylate transporter 4 plays a significant role in the neuroprotective mechanism of ischemic preconditioning in transient cerebral ischemia

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Neural Regeneration Research 2015年第10期10卷 1604-1611页

作者： Seongkweon Hong Ji Yun ahn Geum-Sil Cho In Hye Kim Jeong Hwi Cho Ji Hyeon ahn Joon ha Park Moo-Ho Won Bai Hui Chen Bich-Na Shin Hyun-Jin Tae Seung Min Park Jun Hwi Cho Soo Young Choi Jae-Chul Lee Department of Surgery School of Medicine Kangwon National University Department of Emergency Medicine Sacred Heart Hospital College of Medicine Hallym University Department of Emergency Medicine School of Medicine Kangwon National University Department of Neuroscience College of Medicine Korea University Department of Neurobiology School of Medicine Kangwon National University Department of Physiology College of Medicine Hallym University Department of Biomedical Science Research Institute of Bioscience and Biotechnology Hallym University

Monocarboxylate transporters（MCTs）, which carry monocarboxylates such as lactate across biological membranes, have been associated with cerebral ischemia/reperfusion process. In this study, we studied the effect of ischemic preconditioning（IPC） on MCT4 immunoreactivity after 5 minutes of transient cerebral ischemia in the gerbil. Animals were randomly designated to four groups（sham-operated group, ischemia only group, IPC ＋ sham-operated group and IPC ＋ ischemia group）. A serious loss of neuron was found in the stratum pyramidale of the hippocampal CA1 region（CA1）, not CA2/3, of the ischemia-only group at 5 days post-ischemia; however, in the IPC ＋ ischemia groups, neurons in the stratum pyramidale of the CA1 were well protected. Weak MCT4 immunoreactivity was found in the stratum pyramidale of the CA1 in the sham-operated group. MCT4 immunoreactivity in the stratum pyramidale began to decrease at 2 days post-ischemia and was hardly detected at 5 days post-ischemia; at this time point, MCT4 immunoreactivity was newly expressed in astrocytes. In the IPC ＋ sham-operated group, MCT4 immunoreactivity in the stratum pyramidale of the CA1 was increased compared with the sham-operated group, and, in the IPC ＋ ischemia group, MCT4 immunoreactivity was also increased in the stratum pyramidale compared with the ischemia only group. Briefly, present findings show that IPC apparently protected CA1 pyramidal neurons and increased or maintained MCT4 expression in the stratum pyramidale of the CA1 after transient cerebral ischemia. Our findings suggest that MCT4 appears to play a significant role in the neuroprotective mechanism of IPC in the gerbil with transient cerebral ischemia.

关键词： nerve regeneration monocarboxylate transporters ischemic preconditioning ischemia/ reperfusion injury hippocampus CA1 pyramidal neurons neural regeneration

Generation of induced secretome from adipose-derived stem cells specialized for disease-specific treatment:An experimental mouse model

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World Journal of Stem Cells 2020年第1期12卷 70-86页

作者： Ok-Hee Kim ha-Eun Hong haeyeon Seo Bong Jun Kwak Ho Joong Choi Kee-Hwan Kim Joseph ahn Sang Chul Lee Say-June Kim Catholic Central Laboratory of Surgery Institute of Biomedical IndustryCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Division of Hepato-biliary Pancreatic SurgerySeoul St.Mary’s HospitalCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Uijeongbu St.Mary's HospitalCollege of Medicinethe Catholic University of KoreaSeoul 11765South Korea Department of Surgery Daejeon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 34943South Korea

BACKGROUND Recently,the exclusive use of mesenchymal stem cell(MSC)-secreted molecules,named as the secretome,have been evaluated for overcoming the limitations of cell-based therapy while maintaining its *** To improve cell-free therapy by adding disease-specificity through stimulation of MSCs using disease-causing *** We collected the secretory materials(named as inducers)released from AML12 hepatocytes that had been pretreated with thioacetamide(TAA)and generated the TAA-induced secretome(TAA-isecretome)after stimulating adipose-derived stem cells with the *** TAA-isecretome was intravenously administered to mice with TAA-induced hepatic failure and those with partial *** TAA-isecretome infusion showed higher therapeutic potential in terms of(1)restoring disorganized hepatic tissue to normal tissue;(2)inhibiting proinflammatory cytokines(interleukin-6 and tumor necrosis factor-α);and(3)reducing abnormally elevated liver enzymes(aspartate aminotransferase and alanine aminotransferase)compared to the naïve secretome infusion in mice with TAA-induced hepatic ***,the TAA-isecretome showed inferior therapeutic potential for restoring hepatic function in partially hepatectomized *** analysis of TAA-isecretome identified that antioxidant processes were the most predominant enriched biological networks of the proteins exclusively identified in the *** addition,peroxiredoxin-1,a potent antioxidant protein,was found to be one of representative components of TAA-isecretome and played a central role in the protection of TAA-induced hepatic *** Appropriate stimulation of adipose-derived stem cells with TAA led to the production of a secretome enriched with proteins,especially peroxiredoxin-1,with higher antioxidant *** results suggest that appropriate stimulation of MSCs with pathogenic agents can lead to the production of a secretome specialized for protecting agains

关键词： Adipose-derived stem cells Disease-specificity Mesenchymal stem cells Secretome Peroxiredoxin-1 Thioacetamide Toxic hepatic failure

Heterostructures in two-dimensional colloidal metal chalcogenides:Synthetic fundamentals and applications

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Nano Research 2019年第8期12卷 1750-1769页

作者： Yuho Min Eunmi Im Geon-Tae Hwang Jong-Woo Kim Cheol-Woo ahn Jong-Jin Choi Byung-Dong Hahn Joon-Hwan Choi Woon-ha Yoon Dong-Soo Park Dong Choon Hyun Geon Dae Moon Functional Ceramics Department Powder & Ceramics DivisionKorea Institute of Materials Science (KIMS)ChangwonGyeongnam51508Republic of Korea Department of Polymer Science and Engineering Kyungpook National UniversityDaegu41566Republic of Korea Dongrtam Regional Division Korea Institute of Industrial TechnologyBusan46938Republic of Korea

As a new class of two-dimensional materials, two-dimensional (2D) heterostructures constructed from metal chalcogenides (MCs) have been gaining tremendous attention due to their unprecedented physical and chemical phenomena, mainly originated from their distinct structural features such as composition, architecture type, spatial arrangement of each component, crystal structure, exposed facet and interface, dimensionality in their heterostructures. Towards the realization of practical applications, synthetic approaches need a rational design with a variety of architecture types including laterally-combined, vertically-aligned, and conformally-coated 2D MC heterostructures. Among various synthetic routes, solution-based synthesis is thought of as an alternative to fabrication through high-cost setups since it can control those structural features in a cheap fashion. This review presents recent progress on solution-based synthesis to produce various 2D MC heterostructures with a focus on the synthetic fundamentals in terms of thermodynamic and kinetic aspects related to the growth mechanism. Four different synthetic approaches are reviewed: seeded growth, cation exchange reaction, colloidal atomic layer deposition, direct synthesis including one-step process and modified electrochemical method. We also provide some representative applications of 2D MC heterostructures and their hybrid composites in various fields including optoelectronics, thermoelectrics, catalysis, and battery. Finally, we offer an insight into challenges and future directions in a synthetic improvement of 2D MC heterostructures.

关键词： metal chalcogenide heterostructure anisotropic nanomaterials two-dimensional (2D) nanomaterials solution-based synthesis

Ameliorating liver fibrosis in an animal model using the secretome released from miR-122-transfected adipose-derived stem cells

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World Journal of Stem Cells 2019年第11期11卷 990-1004页

作者： Kee-Hwan Kim Jae Im Lee Ok-Hee Kim ha-Eun Hong Bong Jun Kwak Ho Joong Choi Joseph ahn Tae Yun Lee Sang Chul Lee Say-June Kim Department of Surgery Uijeongbu St.Mary’s HospitalCollege of Medicinethe Catholic University of KoreaSeoul 11765South Korea Catholic Central Laboratory of Surgery Institute of Biomedical IndustryCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Seoul St.Mary’s HospitalCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Daejeon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 34943South Korea

BACKGROUND Recently,the exclusive use of mesenchymal stem cell(MSC)-secreted molecules,called secretome,rather than cells,has been evaluated for overcoming the limitations of cell-based therapy,while maintaining its ***,the use of na?ve secretome may not fully satisfy the specificity of each ***,it appears to be more advantageous to use the functionally reinforced secretome through a series of processes involving physico-chemical adjustments or genetic manipulation rather than to the use na?ve *** To determine the therapeutic potential of the secretome released from miR-122-transfected adipose-derived stromal cells(ASCs).METHODS We collected secretory materials released from ASCs that had been transfected with antifibrotic miR-122(MCM)and compared their antifibrotic effects with those of the na?ve secretome(CM).MCM and CM were intravenously administered to the mouse model of thioacetamide-induced liver fibrosis,and their therapeutic potentials were *** MCM infusion provided higher therapeutic potential in terms of:(A)Reducing collagen content in the liver;(B)Inhibiting proinflammatory cytokines;and(C)Reducing abnormally elevated liver enzymes than the infusion of the na?ve *** proteomic analysis of MCM also indicated that the contents of antifibrotic proteins were significantly elevated compared to those in the na?ve *** We could,thus,conclude that the secretome released from miR-122-transfected ASCs has higher antifibrotic and anti-inflammatory properties than the na?ve *** miR-122 transfection into ASCs provides a specific way of potentiating the antifibrotic properties of ASC secretome,it could be considered as an enhanced method for reinforcing secretome effectiveness.

关键词： Adipose-derived stem cells Liver fibrosis MicroRNAs miR-122 Mesenchymal stem cells Secretome