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Comparative metabolomic analysis of wild type and mads3 mutant rice anthers

Journal of Integrative Plant biology 2014年第9期56卷 849-863页

作者： Guorun Qu Sheng Quan palash Mondol Jie Xu Dabing Zhang Jianxin Shi School of Life Sciences and biotechnology Shanghai Jiao Tong University Shanghai Ruifeng Agro-biotechnology Co. Ltd

Rice（Oryza sativa L.） MADS3 transcription factor regulates the homeostasis of reactive oxygen species（ROS）during late anther development,and one MADS3 mutant,mads3-4,has defective anther walls,aborted microspores and complete male ***,we report the untargeted metabolomic analysis of both wild type and mads3-4 mature *** of MADS3 led to an unbalanced redox status and caused oxidative stress that damages lipid,protein,and *** cope with oxidative stress in mads3-4 anthers,soluble sugars were mobilized and carbohydrate metabolism was shifted to amino acid and nucleic acid metabolism to provide substrates for the biosynthesis of antioxidant proteins and the repair of *** of MADS3 also affected other aspects of rice anther development such as secondary metabolites associated with cuticle,cell wall,and auxin *** of the discovered metabolic changes in mads3-4 anthers were corroborated with changes of expression levels of corresponding metabolic pathway ***,this comparative metabolomic analysis indicated that MADS3 gene affects rice anther development far beyond the ROS homeostasis regulation.

关键词： Anther ascorbate cysteine/cysteine glutathione/oxidized glutathione Oryza.sativa L secondary metabolism

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NERD1 is required for primexine formation and plasma membrane undulation during microsporogenesis in Arabidopsis thaliana

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abIOTECH 2020年第4期1卷 205-218页

作者： Dawei Xu palash Chandra Mondol Sumie Ishiguro Jianxin Shi Dabing Zhang Wanqi Liang Joint International Research Laboratory of Metabolic&Developmental Sciences State Key Laboratory of Hybrid RiceSchool of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China Graduate School of bioagricultural Sciences Nagoya UniversityNagoya 464-8601Japan School of Agriculture Food and WineUniversity of AdelaideAdelaideSA 5064Australia Systems biotechnology Kyung Hee UniversityYongin 446-701South Korea

The primexine formation and plasma membrane undulation are the crucial steps of pollen wall formation in many ***,the molecular mechanism underlining these processes is largely *** Arabidopsis,NEW ENHANCER OF ROOT DWARFISM1(NERD1),a transmembrane protein,was reported to play pleiotropic roles in plant development including male fertility control;while,how NERD1 disruption impacts male reproduction is yet ***,we revealed that the male sterility of nerd1 mutants is attributed to defects in early steps of pollen wall *** found that nerd1-2 is void of primexine formation and microspore plasma membrane undulation,defective in callose ***,sporopollenin precursors are unable to deposit and assemble on the microspore surface,but instead accumulated in the anther locule and tapetal cells,and ultimately leading to microspore ***1 is localized in the Golgi and is expressed in both vegetative and reproductive organs,with the highest expression in reproductive tissues,including the tapetum,male meiocytes,tetrads and mature pollen *** results suggest that NERD1 is required for the primexine deposition and microspore plasma membrane undulation,thus essential for sporopollenin assembly and pollen exine formation.

关键词： Primexine Male sterile Sporopollenin Arabidopsis thaliana

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Critical role of OX40 signaling in the TCR-independent phase of human and murine thymic Treg generation

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Cellular & Molecular Immunology 2019年第2期16卷 138-153页

作者： Prabhakaran Kumar Alejandra Marinelarena Divya Raghunathan Vandhana K Ragothaman Shikha Saini palash b.attacharya Jilao Fan Alan L Epstein Ajay V Maker bellur S Prabhakar Department of Microbiology and Immunology University of Illinois-College of MedicineChicagoILUSA Department of Pathology University of Southern California Keck School of MedicineLos AngelesCAUSA Department of Surgery Division of Surgical OncologyUniversity of Illinois-College of MedicineChicagoILUSA

Regulatory T cells(Tregs)play a pivotal role in immune-tolerance,and loss of Treg function can lead to the development of *** Tregs generated in the thymus substantially contribute to the Treg pool in the periphery,where they suppress self-reactive effector T cells(Teff)***,we showed that OX40L(TNFSF4)is able to drive selective proliferation of peripheral Tregs independent of canonical antigen presentation(CAP-independent)in the presence of low-dose ***,we hypothesized that OX40 signaling might be integral to the TCR-independent phase of murine and human thymic Treg(tTreg)*** of tTregs is a two-step process:Strong T-cell receptor(TCR)signals in combination with co-signals from the TNFRSF members facilitate tTreg precursor selection,followed by a TCR-independent phase of tTreg development in which their maturation is driven by ***,we investigated whether OX40 signaling could also play a critical role in the TCR-independent phase of tTreg ***40−/−mice had significantly reduced numbers of CD25−Foxp3low tTreg precursors and CD25+Foxp3+mature tTregs,while OX40L treatment of WT mice induced significant proliferation of these cell *** to tTeff cells,OX40 was expressed at higher levels in both murine and human tTreg precursors and mature *** ex vivo cultures,OX40L increased tTreg maturation and induced CAP-independent proliferation of both murine and human tTregs,which was mediated through the activation of AKT-mTOR *** novel findings show an evolutionarily conserved role for OX40 signaling in tTreg development and proliferation,and might enable the development of novel strategies to increase Tregs and suppress autoimmunity.

关键词： Thymic Tregs OX40L IL-2 Treg proliferation maturation

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Thermal behavior and Magnetic Properties of Nd-Fe-b based Exchange Spring Nanocomposites Nd4-xTbxFe83.5Co5Cu0.5Nb1b6(x = 0, 0.2, 0.4, 0.6, 0.8 and 1) Melt-Spun Ribbons

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Advances in Materials Physics and Chemistry 2017年第6期7卷 223-241页

作者： palash Chandra Karmaker Mohammad Obaidur Rahman Nguyen Huy Dan Samia Islam Liba Per Nordblad Dilip Kumar Saha Sheikh Manjura Hoque Materials Science Division Atomic Energy CenterDhakaBangladesh Department of Physics Jahangirnagar UniversityDhakaBangladesh Institute of Materials Science Vietnam Academy of Science and TechnologyHanoiVietnam Solid State Physics Department of Engineering ScienceUppsala UniversityUppsalaSweden

Co-rich Nd-Fe-b nanocomposite ribbons with Tb substituted have been fabricated by single roller melt spinning technique of Nd4-xTbxFe83.5Co5Cu0.5Nb1b6 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) alloys in an argon (Ar) atmosphere at a circumferential speed of 40 m/s. According to the differential scanning calorimeter (DSC) traces the nanocomposite samples have been annealed at different temperatures like 675°C, 687°C, 700°C, 712°C and 725°C for 10 min. Crystallization behavior was studied by X-ray diffraction in which it was found that the XRD patterns are characterized by broad diffused pattern which demonstrate the amorphous state of materials. The ribbon samples were also characterized by vibration sample magnetometer (VSM) and Mössbauer spectroscopy at as-cast and annealed condition. Co-rich and Tb substitution has significantly enhanced the value of coercivity (Hc) and maximum energy product (bH)max. Highest value of Hc and (bH)max has been obtained as 2.36 kOe and 6.11 MGOe for the sample annealed at 700°C for 10 min with higher concentration of Tb. The M-H hysteresis loops show extremely soft natures which do not possess any area. We have found reduced remanent ratio (Mr/Ms) up to 0.49 at optimal annealing temperature 700°C. However, with the annealing of the samples in the above mentioned temperature, evolution of large coercivity was observed due to the formation of exchange couple hard and soft nanocrystal composites. We have investigated the variation of Curie temperature (Tc) with annealing temperature of the melt spun ribbon samples. Mossbauer spectroscopy was carried out to study the hyperfine parameters such as hyperfine field, hyperfine field distribution for full width half maximum (FWHM) and isomer shift of Fe species of these two phases.

关键词： Coercivity Maximum Energy Product Remanent Ratio Nanocomposite Hard and Soft Phases

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