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Lipid phosphorylation by a diacylglycerol kinase suppresses ABA biosynthesis to regulate plant stress responses

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Molecular Plant 2024年第2期17卷 342-358页

作者： Jianwu Li Shuaibing Yao Sang-chul kim Xuemin Wang Department of Biology University of Missouri-St.LouisSt.LouisMO 63121USA Donald Danforth Plant Science Center St.LouisMO 63132USA

Lipid phosphorylation by diacylglycerol kinase(DGK)that produces phosphatidic acid(PA)plays important roles in various biological processes,including stress responses,but the underlying mechanisms remain ***,we show that DGK5 and its lipid product PA suppress ABA biosynthesis by interacting withABA-DEFICIENT2(ABA2),a key ABA biosynthesis enzyme,to negatively modulate plant responseto abiotic stress tested in Arabidopsis *** of DGK5 function rendered plants less damaged,whereas overexpression(OE)of DGK5 enhanced plant damage to water and salt *** dgk5 mutant plants exhibited decreased total cellular and nuclear levels of PA with increased levels of diacylglycerol,whereas DGK5-OE plants displayed the opposite ***,we found that both DGK5 and PA bind to the ABA-synthesizing enzyme ABA2 and suppress its enzymatic ***,the dgk5 mutant plants exhibited increased levels of ABA,while DGK5-OE plants showed reduced ABA *** addition,we showed that both DGK5 and ABA2 are detected in and outside the nuclei,and loss of DGK5 function decreased the nuclear association of *** found that both DGK5 activity and PA promote nuclear association of *** together,these results indicate that both DGK5 and PA interact with ABA2 to inhibit its enzymatic activity and promote its nuclear sequestration,thereby sup-pressing ABA production in response to abiotic *** study reveals a sophisticated mechanism by which DGK5 and PA regulate plant stress responses.

关键词： diacylglycerol kinase phosphatidic acid diacylglycerol lipid signaling stress responses lipid-protein binding protein-protein interaction Arabidopsis

Methane Emission from Rice Fields:Necessity for Molecular Approach for Mitigation

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Rice science 2024年第2期31卷 159-178页

作者： Sujeevan RAJENDRAN Hyeonseo PARK Jiyoung kim Soon Ju PARK Dongjin SHIN Jong-Hee LEE Young Hun SONG Nam-Chon PAEK chul Min kim Department of Horticulture Industry Wonkwang UniversityIksan 54538Korea Plant Molecular Biology and Biotechnology Research Center Gyeongsang National UniversityJinju 52828Korea Department of Southern Area Crop Science National Institute of Crop ScienceMiryang 50424Korea Department of Agricultural Biotechnology Seoul National UniversitySeoul 08826Korea Department of Plant Science Plant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Korea

Anthropogenic methane emissions are a leading cause of the increase in global averagetemperatures,often referred to as global *** soils play a significant role in methaneproduction,where the anaerobic conditions promote the production of methane by *** fields contribute a considerable portion of agricultural methane emissions,as riceplants provide both factors that enhance and limit methane *** plants harbor both methaneproducingand methane-oxidizing *** from rice roots provide source for methaneproduction,while oxygen delivered from the root aerenchyma enhances methane *** haveshown that the diversity of these microorganisms depends on rice cultivars with some genes characterizedas harboring specific groups of microorganisms related to methane ***,there is still aneed for research to determine the balance between methane production and oxidation,as rice plantspossess the ability to regulate net methane *** agronomical practices,such as fertilizerand water management,have been employed to mitigate methane ***,studiescorrelating agronomic and chemical management of methane with productivity are ***,evidences for breeding low-methane-emitting rice varieties are scattered largely due to the absence ofcoordinated breeding *** has indicated that phenotypic characteristics,such as rootbiomass,shoot architecture,and aerenchyma,are highly correlated with methane *** reviewdiscusses available studies that involve the correlation between plant characteristics and *** emphasizes the necessity and importance of breeding low-methane-emitting rice varieties inaddition to existing agronomic,biological,and chemical *** review also delves into the idealphenotypic and physiological characteristics of low-methane-emitting rice and potential breeding techniques,drawing from studies conducted

关键词： methane emission rice breeding aerenchyma greenhouse gas radial oxygen loss

Ethyl acetate fraction of Sargassum pallidum extract attenuates particulate matter-induced oxidative stress and inflammation in keratinocytes and zebrafish

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Asian Pacific Journal of Tropical Biomedicine 2024年第4期14卷 137-146页

作者： Wook chul kim Ji-Won Park Bohyun Yun WonWoo Lee Kyung-Min Choi Seung-Hong Lee Department of Medical Science Soonchunhyang UniversityAsan 31538Republic of Korea Honam National Institute of Biological Resources 99Gohadoan-gilMokpo-siJeollanam-do 58762Republic of Korea Department of Pharmaceutical Engineering Soonchunhyang UniversityAsan 31538Republic of Korea

Objective:To evaluate the effect of the ethyl acetate fraction derived from Sargassum pallidum extract against particulate matter(PM)-induced oxidative stress and inflammation in HaCaT cells and ***:HaCaT cells and zebrafish were used to evaluate the protective effects of the ethyl acetate fraction of Sargassum pallidum extract against PM-induced oxidative stress and *** production of nitric oxide(NO),intracellular ROS,prostaglandin E_(2)(PGE_(2)),and pro-inflammatory cytokines,and the expression levels of COX-2,iNOS,and NF-κB were evaluated in PM-induced HaCaT ***,the levels of ROS,NO,and lipid peroxidation were assessed in the PM-exposed zebrafish ***:The ethyl acetate fraction of Sargassum pallidum extract significantly decreased the production of NO,intracellular ROS,and PGE_(2) in PM-induced HaCaT *** addition,the fraction markedly suppressed the levels of pro-inflammatory cytokines and inhibited the expression levels of COX-2,iNOS,and NF-κ***,it displayed remarkable protective effects against PM-induced inflammatory response and oxidative stress,represented by the reduction of NO,ROS,and lipid peroxidation in ***:The ethyl acetate fraction of Sargassum pallidum extract exhibits a protective effect against PM-induced oxidative stress and inflammation both in vitro and in vivo and has the potential as a candidate for the development of pharmaceutical and cosmeceutical products.

关键词： Particulate matter Inflammation Oxidative stress Sargassum pallidum Ethyl acetate fraction Zebrafish

Diagnosis of building energy consumption in the 2012 CBECS data using heterogeneous effect of energy variables:A recursive partitioning approach

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Building Simulation 2021年第6期14卷 1737-1755页

作者： Doowon Choi chul kim Department of Industrial and Systems Engineering College of EngineeringTexas A&M UniversityCollege StationTX 77843USA Indoor Air Quality Research Center Korea Institute of Civil Engineering and Building TechnologyGoyang-Si10223R.O.Korea

Numerous previous literature has attempted to apply machine learning techniques to analyze relationships between energy variables in energy ***,most machine learning methods are primarily used for prediction through complicated learning processes at the expense of *** methods have difficulties in evaluating the effect of energy variables on energy consumption and especially capturing their heterogeneous ***,to identify the energy consumption of the heterogeneous relationships in actual buildings,this study applies the MOdel-Based recursive partitioning(MOB)algorithm to the 2012 CBECS survey data,which would offer representative information about actual commercial building characteristics and energy *** resultant tree-structured subgroups,the MOB tree reveals the heterogeneous effect of energy variables and mutual influences on building energy *** results of this study would provide insights for architects and engineers to develop energy conservative design and retrofit in *** buildings.

关键词： CBECS,commercial building decision tree analysis MOdel-Based recursive partitioning(MOB)algorithm recursive partitioning subgroup identification

Hyperlipidemia and erectile dysfunction

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Asian Journal of Andrology 2000年第3期2卷 161-166页

作者： Sae-chul kim Department of Urology College of Medicine Chung-Ang University Seoul Korea

We have done consecutive studies to investigate the effects of impaired lipid metabolism on the contractile and re-laxation response of cavernous smooth muscles and to elucidate its pathogenesis: 1) incidence of hyperlipidemia in im-potent patients; 2) erection response to intracavemous injection of papaverine in impotent patients with hyperlipidemia;3) relaxation responses of isolated cavemosal smooth muscles to endothelium-independent and endothelium-dependentvasodilators in impotent patients with hypercholesterolemia or hypertriglyceridemia; 4) involvement of superoxide radi-cal in the impaired endothelium-dependent relaxation of cavemous smooth muscle in hypercholesterolemic rabbits; S)effects of isolated lipoproteins and triglyceride, combined oxidized LDL plus triglyceride, and combined oxidized LDLplus HDL on contractile and relaxation response of rabbit cavemous smooth muscles; 6) involvement of e-NOS in theimpaired endothelium-dependent relaxation of cavemous smooth muscle in hypercholesterolemic rabbit. Hypercholes-terolemia may cause impairment of endothelium-dependent relaxation. Oxidized LDL is the major causative cholesterolof the impaired relaxation response. A chain reaction, the production of superoxide radicals and functional impairmentof eNOS may be a major cause of the functional impairment in the early stages of hypercholesterolemia.

关键词： hypercholesterolemia hypertriglyceridemia LDL lipoproteins HDL lipoproteins superoxide radicals NO synthase cavemous smooth muscle erectile dysfunction

Atrial natriuretic peptide signal pathway upregulated in stomach of streptozotocin-induced diabetic mice

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World Journal of Gastroenterology 2010年第1期16卷 48-55页

作者： Young-chul kim Department of Physiology Chungbuk National University College of Medicine

AIM:To investigate atrial natriuretic peptide(ANP) secretion from gastric mucosa and the relationship between the ANP/natriuretic peptide receptor type A (NPR-A)pathway and diabetic gastroparesis. METHODS:Male imprinting control region(ICR)mice (4 wk old)were divided into two groups:control mice, and streptozotocin-induced diabetic *** weeks after injection,spontaneous gastric contraction was recorded by using physiography in control and streptozotocin-induced diabetic *** ANP-positive cells in gastric mucosa and among dispersed gastric epithelial cells were detected by using immunohistochemistry and flow cytometry,*** and natriureticpeptide receptor type A(NPR-A)gene expression in gastric tissue was observed by using the reverse transcriptase polymerase chain reaction. RESULTS:The frequency of spontaneous gastric contraction was reduced from 12.9±0.8 cycles/min in the control group to 8.4±0.6 cycles/min in the diabetic mice(n=8,P<0.05).However,the amplitude of contraction was not significantly affected in the diabetic *** depletion of interstitial cells of Cajal in the gastric muscle layer was observed in the diabetic ***-positive cells were distributed in the gastric mucosal layer and the density index of ANP-positive cells was increased from 20.9±2.2 cells/field in control mice to 51.8±2.9 cells/field in diabetic mice(n=8, P<0.05).The percentage of ANP-positive cells among the dispersed gastric epithelial cells was increased from 10.0%±0.9%in the control mice to 41.2%± 1.0%in the diabetic mice(n=3,P<0.05).ANP and NPR-A genes were both expressed in mouse stomach, and the expression was significantly increased in the diabetic mice. CONCLUSION:These results suggest that the ANP/ NPR-A signaling pathway is upregulated in streptozotocin-induced diabetic mice,and contributes to the development of diabetic gastroparesis.

关键词： Diabetes mellitus Atrial natriuretic peptide Gastric mucosa Gastroparesis

1.45 GPa ultrastrong cryogenic strength with superior impact toughness in the in-situ nano oxide reinforced CrMnFeCoNi high-entropy alloy matrix nanocomposite manufactured by laser powder bed fusion

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Journal of Materials Science & Technology 2022年第2期97卷 10-19页

作者： Young-Kyun kim Min-chul kim Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon 22212Republic of Korea Korea Atomic Energy Research Institute(KAERI) Daejeon 34057Republic of Korea

CrMnFeCoNi high-entropy alloys(HEAs)exhibit an excellent combination of tensile strength and ductility at cryogenic *** study led to the introduction of a new method for the development of high-performance CrMnFeCoNi HEAs at cryogenic temperatures by jointly utilizing additive manufacturing(AM)and the addition of interstitial *** interstitial oxygen present in the powder feedstock was transformed into beneficial nano-sized oxides during AM *** HEA nanocomposite fabricated using laser powder bed fusion(L-PBF)not only contains heterogeneous grains and substructures but also a high number density of nano-sized *** tensile results revealed that the L-PBF HEA nanocomposite has superior yield strengths of 0.77 GPa and 1.15 GPa,and tensile strengths of 0.92 GPa and 1.45 GPa at 298 K and 77 K,*** addition,the Charpy impact energies of the samples tested at 298 K and 77 K were measured as 176.2 J and 103.7 J,*** results indicate that the L-PBF HEA nanocomposite successfully overcomes the well-known strength-toughness *** tensile deformation microstructure contained a relatively large number of deformation twins(DTs)at cryogenic temperature,a possible consequence of the decrease in the stacking fault energy with decreasing *** the other hand,cracks were found to propagate along the grain boundaries at room temperature,whereas a transgranular crack was observed at cryogenic temperature in the specimens fractured as a result of the Charpy impact.

关键词： Laser powder bed fusion High-entropy alloy matrix nanocomposite Nano-oxide:cryogenic Tensile Impact toughness

Microstructure and Mechanical Properties of Hyper-eutectic Al-Si Alloys Fabricated by Spray Casting

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Journal of Materials Science & Technology 2008年第1期24卷 48-50页

作者： Min Ryou chul-Hyun kim Myung-Ho kim School of Materials Science and Engineering Inha University 253 Yonghyun-DongNam-GuIncheon 402-751Korea Dong Yang Piston Co. LTD 1050Singil-DongDonwon-GuAnsanKyungki-DoKorea

Microstructure and mechanical properties of hyper-eutectic Al-Si alloy fabricated by spray casting were in- vestigated and then these results were compared with those by squeeze *** spray-cast specimen was found to have finer Si particles （～5μm） compared to the squeeze-cast specimen （10-25μm）.The tensile strength and elongation of the spray-cast specimen are also higher than those of the squeeze cast *** was considered that the increased mechanical properties of the spray-cast specimen were mainly due to finer size of the Si particles distributed in Al matrix.

关键词： Hyper-eutectic Al-Si alloy Squeeze casting Spray casting

Suppression of gold nanoparticle agglomeration and its separation via nylon membranes

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Chinese Journal of Chemical Engineering 2017年第7期25卷 931-937页

作者： Ayyavoo Jayalakshmi In-chul kim Young-Nam Kwon School of Urban and Environmental Engineering Ulsan National Institute of Sdence and TechnologyUlsan 689-798Korea KIST-UNIST UIsan Center for Convergent Materials UNIST(Ulsan National Institute of Science and Technology)Korea Environment and Resources Research Center Korea Research Institute Chemical TechnologyDaejeon 305-606Korea

Use of ultraporous nylon membrane is one of the most widely employed techniques for removal of hard and soft nanoparticles in the semiconductor industry, and the accurate determination of membrane pore size is necessary in order to avoid manufacturing defects caused by contamination. The gold nanoparticle has several benefits for the evaluation of polymeric membranes; however, the nanoparticles agglomerate easily on the nylon membrane and make it difficult to evaluate the membrane precisely. The properties of 2-amino-2-hydroxymethyl-1,3-propanediol(ADP) ligand in gold nanoparticle solution were systematically investigated, and ADP was utilized for improved evaluation of the nylon membranes. Nylon membrane used in this study was prepared by phase inversion techniques. Ultrathin dense layer on top of the membrane surface and Darcy structures in the microporous membrane support were observed. The gold particle rejection was carried out at various p H values from 4 to14 and higher rejection was observed at p H 4 and 8. The suppression of gold colloid agglomeration using ADP and monodispersity of gold colloids was also analyzed by confocal laser scanning microscopy(CLSM), transmission electron microscopy(TEM), and scanning electron microscopy(SEM). van der Waals interaction energy of the particles was reduced in the addition of ADP. The presence of ADP ligand in the gold solutions prevented the agglomeration of gold nanoparticles and reduced the adsorption of the particles on the nylon membrane surface,leading to precise evaluation of membrane pore sizes.

关键词： Particle size Electron microscopy Gold colloid flock Semiconductor