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https://www.readbyqxmd.com/read/28110191/asiatic-acid-enhances-nrf2-signaling-to-protect-hepg2-cells-from-oxidative-damage-through-akt-and-erk-activation
#1
Zhimin Qi, Xinxin Ci, Jingbo Huang, Qinmei Liu, Qinlei Yu, Junfeng Zhou, Xuming Deng
Asiatic acid (AA), a natural triterpene isolated from the plant Centella asiatica, have antioxidative potential, but the molecular mechanism of AA against oxidative stress remains unclear. Our study was performed to investigate the antioxidative effect of AA against oxidative stress and the antioxidative mechanism in tert-butyl hydroperoxide (t-BHP) -stimulated the HepG2 cells. The results showed that AA suppressed t-BHP-induced cytotoxicity, apoptosis, and reactive oxygen species (ROS) generation. Additionally, AA activated the nuclear factor erythroid 2-related factor 2 (Nrf2) signal, which was closely related to induction Nrf2 nuclear translocation, reduction the expression of Keap1 and up-regulation the activity of the antioxidant response element (ARE)...
January 19, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28109919/the-ozone-like-syndrome-in-durum-wheat-triticum-durum-desf-mechanisms-underlying-the-different-symptomatic-responses-of-two-sensitive-cultivars
#2
Valentina Picchi, Robert Monga, Riccardo Marzuoli, Giacomo Gerosa, Franco Faoro
Colombo and Sculptur are two modern durum wheat cultivars that, in previous studies, proved to be very sensitive to ozone injury in terms of eco-physiological parameters and significant grain yield loss. Nevertheless, their response regarding leaf visible symptoms was very different; Sculptur showed almost no symptoms, even after several weeks of ozone exposure, whereas Colombo showed in a few weeks typical ozone-like symptoms (chlorotic/necrotic spots). The mechanisms underlying this different response has been studied with a biochemical and microscopical approach...
January 12, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28104332/a-bacillus-sp-strain-with-antagonistic-activity-against-fusarium-graminearum-kills-microcystis-aeruginosa-selectively
#3
Huanling Xuan, Xianzhu Dai, Jing Li, Xiaohui Zhang, Caiyun Yang, Feng Luo
Cyanobacterial harmful algal blooms (CyanoHABs) cause severe environmental problems, economic losses and threaten human health seriously. In the present study, a Bacillus sp. strain, designated as AF-1, with strong antagonistic activity against plant pathogenic fungus Fusarium graminearum was isolated from purple soil. Bacillus sp. AF-1 selectively killed Microcystis aeruginosa at low cell density (1.6×10(3)cfu/mL), and showed the strongest bactericidal activity against M. aeruginosa NIES-843 (Ae=93%, t=6d)...
January 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28100685/heat-stress-induces-ferroptosis-like-cell-death-in-plants
#4
Ayelén Mariana Distéfano, María Victoria Martin, Juan Pablo Córdoba, Andrés Martín Bellido, Sebastián D'Ippólito, Silvana Lorena Colman, Débora Soto, Juan Alfredo Roldán, Carlos Guillermo Bartoli, Eduardo Julián Zabaleta, Diego Fernando Fiol, Brent R Stockwell, Scott J Dixon, Gabriela Carolina Pagnussat
In plants, regulated cell death (RCD) plays critical roles during development and is essential for plant-specific responses to abiotic and biotic stresses. Ferroptosis is an iron-dependent, oxidative, nonapoptotic form of cell death recently described in animal cells. In animal cells, this process can be triggered by depletion of glutathione (GSH) and accumulation of lipid reactive oxygen species (ROS). We investigated whether a similar process could be relevant to cell death in plants. Remarkably, heat shock (HS)-induced RCD, but not reproductive or vascular development, was found to involve a ferroptosis-like cell death process...
January 18, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28098759/reactive-oxygen-species-generated-by-nadph-oxidases-promote-radicle-protrusion-and-root-elongation-during-rice-seed-germination
#5
Wen-Yan Li, Bing-Xian Chen, Zhong-Jian Chen, Yin-Tao Gao, Zhuang Chen, Jun Liu
Seed germination is a complicated biological process that requires regulation through various enzymatic and non-enzymatic mechanisms. Although it has been recognized that reactive oxygen species (ROS) regulate radicle emergence and root elongation in a non-enzymatic manner during dicot seed germination, the role of ROS in monocot seed germination remains unknown. NADPH oxidases (NOXs) are the major ROS producers in plants; however, whether and how NOXs regulate rice seed germination through ROS generation remains unclear...
January 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28097691/oilseed-rape-nac56-transcription-factor-modulates-reactive-oxygen-species-accumulation-and-hypersensitive-response-like-cell-death
#6
Qinqin Chen, Fangfang Niu, Jingli Yan, Bisi Chen, Feifei Wu, Xiaohua Guo, Bo Yang, Yuan-Qing Jiang
The NAC (NAM, ATAF1/2, CUC2) transcription factor gene family is plant-specific and plays diverse roles in development and responses to abiotic stresses and pathogen challenge. Oilseed rape (Brassica napus) or canola is an important oil crop worldwide, however, the function of NAC genes in it remains largely elusive. Here, we identified and characterized the NAC56 gene isolated from oilseed rape. Expression of BnaNAC56 was induced by abscisic acid (ABA), jasmonic acid (JA), methyl viologen (MV) and a necrotrophic fungal pathogen Sclerotinia sclerotiorum, but repressed by cold...
January 18, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28096192/integrated-physiological-proteomic-and-metabolomic-analysis-of-uv-stress-responses-and-adaptation-mechanisms-in-pinus-radiata
#7
Jesus Pascual, Maria Jesus Canal, Monica Escandon, Monica Meijon, Wolfram Weckwerth, Luis Valledor
Globally expected changes in environmental conditions, especially the increase of UV irradiation, necessitate extending our knowledge of the mechanisms mediating tree species adaptation to this stress. This is crucial for designing new strategies to maintain future forest productivity. Studies focused on environmentally realistic dosages of UV irradiation in forest species are scarce. Pinus sp. are commercially relevant trees and not much is known about their adaptation to UV. In this work, UV treatment and recovery of Pinus radiata plants with dosages mimicking future scenarios, based on current models of UV radiation, were performed in a time-dependent manner...
January 17, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28092850/tomato-slggp-like-gene-participates-in-plant-responses-to-chilling-stress-and-pathogenic-infection
#8
Dong-Yue Yang, Meng Li, Na-Na Ma, Xing-Hong Yang, Qing-Wei Meng
Plants are always exposed to abiotic and biotic stresses which can adversely affect their growth and development. As an important antioxidant, AsA plays a vital role in plant defence against damage caused by stresses. In this study, we cloned a tomato GDP-L-galactose phosphorylase-like (SlGGP-LIKE) gene and investigated its role in resistance to abiotic and biotic stresses by using antisense transgenic (AS) tomato lines. The AsA content in AS plants was lower than that in WT plants. Under chilling stress, the growth of AS plants was inhibited significantly, and they yielded higher levels of ROS, REC and MDA but demonstrated weaker APX activity than that shown by WT plants...
January 9, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28092839/effect-and-mechanism-of-sorbus-pohuashanensis-hante-hedl-flavonoids-protect-against-arsenic-trioxide-induced-cardiotoxicity
#9
Xiaojin Yu, Zhenyu Wang, Zunpeng Shu, Zhengqing Li, Yuan Ning, Keli Yun, Haina Bai, Ruihai Liu, Wenli Liu
The cardiotoxicity of arsenic trioxide (ATO) limits its clinical application in cancer treatment. Evidences suggest that sorbus has antioxidant activity and its consumption has been linked with improved cardioprotection. In this study, we investigated the cardio-protective effect and mechanisms of Sorbus pohuashanensis (Hante) Hedl. flavonoids (SPF) against ATO in BALB/c mice and H9c2 cells. Eleven major flavonoids were confirmed by ultra-performance liquid chromatography electrospray ionization quadrupole time of flight mass spectrometry (UPLC-ESI-Q-TOF-MS)...
January 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28092771/plant-peroxisomes-a-nitro-oxidative-cocktail
#10
REVIEW
Francisco J Corpas, Juan B Barroso, José M Palma, Marta Rodriguez-Ruiz
Although peroxisomes are very simple organelles, research on different species has provided us with an understanding of their importance in terms of cell viability. In addition to the significant role played by plant peroxisomes in the metabolism of reactive oxygen species (ROS), data gathered over the last two decades show that these organelles are an endogenous source of nitric oxide (NO) and related molecules called reactive nitrogen species (RNS). Molecules such as NO and H2O2 act as retrograde signals among the different cellular compartments, thus facilitating integral cellular adaptation to physiological and environmental changes...
January 3, 2017: Redox Biology
https://www.readbyqxmd.com/read/28088182/overexpression-of-wheat-ferritin-gene-tafer-5b-enhances-tolerance-to-heat-stress-and-other-abiotic-stresses-associated-with-the-ros-scavenging
#11
Xinshan Zang, Xiaoli Geng, Fei Wang, Zhenshan Liu, Liyuan Zhang, Yue Zhao, Xuejun Tian, Zhongfu Ni, Yingyin Yao, Mingming Xin, Zhaorong Hu, Qixin Sun, Huiru Peng
BACKGROUND: The yield of wheat (Triticum aestivum L.), an important crop, is adversely affected by heat stress in many regions of the world. However, the molecular mechanisms underlying thermotolerance are largely unknown. RESULTS: A novel ferritin gene, TaFER, was identified from our previous heat stress-responsive transcriptome analysis of a heat-tolerant wheat cultivar (TAM107). TaFER was mapped to chromosome 5B and named TaFER-5B. Expression pattern analysis revealed that TaFER-5B was induced by heat, polyethylene glycol (PEG), H2O2 and Fe-ethylenediaminedi(o-hydroxyphenylacetic) acid (Fe-EDDHA)...
January 14, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28088021/sanguinarine-induced-oxidative-stress-and-apoptosis-like-programmed-cell-death-al-pcd-in-root-meristem-cells-of-allium-cepa
#12
Aneta Żabka, Konrad Winnicki, Justyna Teresa Polit, Janusz Maszewski
A vast number of studies on plant cell systems clearly indicate that various biotic and abiotic stresses give rise to the uncontrolled increase in the level of reactive oxygen species (ROS). Excess concentrations of ROS result in damage to proteins, lipids, carbohydrates, and DNA, which may lead, in consequence, to the apoptotic cell death. The current study investigates the effects of sanguinarine (SAN), a natural alkaloid derived from the roots of Sanguinaria canadensis, on root apical meristem cells of Allium cepa...
January 4, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28078844/a-natural-formula-containing-lactoferrin-equisetum-arvensis-soy-isoflavones-and-vitamin-d3-modulates-bone-remodeling-and-inflammatory-markers-in-young-and-aged-rats
#13
L Menghini, C Ferrante, L Leporini, L Recinella, A Chiavaroli, S Leone, G Pintore, M Vacca, G Orlando, L Brunetti
A pivotal role in osteoporosis development is played by radical oxygen species (ROS), the increased production of which is related to inhibited osteoblastic activity and bone formation. A new field of research could involve medicinal plants with antioxidant and protective effects in osteoporosis. Furthermore, considering the multifactorial metabolic aspects of osteoporosis, the pharmacological association of multiple medicinal plants could improve patient response. The aim of the present study is to evaluate in vitro and in vivo the protective effects of a natural formula containing lactoferrin 12%, Equisetum arvensis ES 54%, soy isoflavones 34% and vitamin D3 0...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28074659/ferulic-acid-fa-abrogates-%C3%AE-radiation-induced-oxidative-stress-and-dna-damage-by-up-regulating-nuclear-translocation-of-nrf2-and-activation-of-nhej-pathway
#14
Ujjal Das, Krishnendu Manna, Amitava Khan, Mahuya Sinha, Sushobhan Biswas, Aaveri Sengupta, Anindita Chakraborty, Sanjit Dey
The present study was aimed to evaluate the radioprotective effect of ferulic acid (FA), a naturally occurring plant flavonoid in terms of DNA damage and damage related alterations of repair pathways by gamma radiation. FA was administered at a dose of 50 mg/kg body weight for five consecutive days prior to exposing the swiss albino mice to a single dose of 10 Gy gamma radiation. Ionising radiation induces oxidative damage manifested by decreased expression of Cu, Zn-SOD (SOD stands for super oxide dismutase), Mn-SOD and catalase...
January 11, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28073158/antimicrobial-activity-and-mechanism-of-action-of-a-thionin-like-peptide-from-capsicum-annuum-fruits-and-combinatorial-treatment-with-fluconazole-against-fusarium-solani
#15
Gabriel B Taveira, Érica O Mello, André O Carvalho, Mariana Regente, Marcela Pinedo, Laura de La Canal, Rosana Rodrigues, Valdirene M Gomes
Many Fusarium species are able to cause severe infections in plants as well as in animals and humans. Therefore, the discovery of new antifungal agents is of paramount importance. CaThi belongs to the thionins, which are cationic peptides with low molecular weights (∼ 5 kDa) that have toxic effects against various microorganisms. Herein, we study the mechanism of action of CaThi and its combinatory effect with fluconazole (FLC) against Fusarium solani. The mechanism of action of CaThi was studied by growth inhibition, viability, plasma membrane permeabilization, ROS induction, caspase activation, localization and DNA binding capability, as assessed with Sytox green, DAB, FITC-VAD-FMK, CaThi-FITC and gel shift assays...
January 10, 2017: Biopolymers
https://www.readbyqxmd.com/read/28068628/epoxy-clerodane-diterpene-inhibits-mcf-7-human-breast-cancer-cell-growth-by-regulating-the-expression-of-the-functional-apoptotic-genes-cdkn2a-rb1-mdm2-and-p53
#16
P Subash-Babu, Ghedeir M Alshammari, S Ignacimuthu, Ali A Alshatwi
Systematic analyses of plants that are used in traditional medicine may lead to the discovery of novel cytotoxic secondary metabolites. Diterpene possesses multiple bioactivities; here, epoxy clerodane diterpene (ECD) was isolated from Tinospora cordifolia (Willd.) stem and shown potential antiproliferative effect in MCF-7 human breast cancer cells. The antiproliferative effect of ECD on MCF-7 cells was systematically analyzed by cell and nuclear morphology, alterations in oxidative stress, and the expression of tumor suppressor and mitochondria-mediated apoptosis-related genes...
January 6, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28064248/mir393-mediated-auxin-signaling-regulation-is-involved-in-root-elongation-inhibition-in-response-to-toxic-aluminum-stress-in-barley
#17
Bin Bai, Hongwu Bian, Zhanghui Zeng, Ning Hou, Bo Shi, Junhui Wang, Muyuan Zhu, Ning Han
High-throughput small RNA sequencing has identified several potential aluminum (Al)-responsive microRNAs (miRNAs); however, their regulatory role remains unknown. Here, we identified two miR393 family members in barley, and confirmed two target genes-HvTIR1 and HvAFB-through a modified form of 5'-RACE (rapid amplification of cDNA ends) as well as degradome data analysis. Furthermore, we investigated the biological function of the miR393/target module in root development and its Al stress response. The investigation showed that miR393 affected root growth and adventitious root number by altering auxin sensitivity...
January 7, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28059073/ros-accumulation-and-antiviral-defence-control-by-microrna528-in-rice
#18
Jianguo Wu, Rongxin Yang, Zhirui Yang, Shengze Yao, Shanshan Zhao, Yu Wang, Pingchuan Li, Xianwei Song, Lian Jin, Tong Zhou, Ying Lan, Lianhui Xie, Xueping Zhou, Chengcai Chu, Yijun Qi, Xiaofeng Cao, Yi Li
MicroRNAs (miRNAs) are key regulators of plant-pathogen interactions. Modulating miRNA function has emerged as a new strategy to produce virus resistance traits(1-5). However, the miRNAs involved in antiviral defence and the underlying mechanisms remain largely elusive. We previously demonstrated that sequestration by Argonaute (AGO) proteins plays an important role in regulating miRNA function in antiviral defence pathways(6). Here we reveal that cleavage-defective AGO18 complexes sequester microRNA528 (miR528) upon viral infection...
January 6, 2017: Nature Plants
https://www.readbyqxmd.com/read/28056779/transcriptome-profiling-reveals-the-genetic-basis-of-alkalinity-tolerance-in-wheat
#19
Chen Meng, Tai-Yong Quan, Zhong-Yi Li, Kang-Li Cui, Li Yan, Yu Liang, Jiu-Lan Dai, Guang-Min Xia, Shu-Wei Liu
BACKGROUND: Soil alkalinity shows significant constraints to crop productivity; however, much less attention has been paid to analyze the effect of soil alkalinity on plant growth and development. Shanrong No. 4 (SR4) is an alkalinity tolerant bread wheat cultivar selected from an asymmetric somatic hybridization between the bread wheat cultivar Jinan 177 (JN177) and tall wheatgrass (Thinopyrum ponticum), which is a suitable material for studying alkalinity tolerant associate genes. RESULTS: The growth of SR4 plant seedlings was less inhibited than that of JN177 when exposed to alkalinity stress conditions...
January 5, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28055133/drought-coping-strategies-in-cotton-increased-crop-per-drop
#20
REVIEW
Abid Ullah, Heng Sun, Xiyan Yang, Xianlong Zhang
The growth and yield of many crops, including cotton, are affected by water deficit. Cotton has evolved drought-specific as well as general morpho-physiological, biochemical and molecular responses to drought stress, which are discussed in this review. The key physiological responses against drought stress in cotton, including stomata closing, root development, cellular adaptations, photosynthesis, abscisic acid (ABA) and jasmonic acid (JA) production, and reactive oxygen species (ROS) scavenging, have been identified by researchers...
January 5, 2017: Plant Biotechnology Journal
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