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Target of rapamycin, plant

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https://www.readbyqxmd.com/read/28476678/anticancer-efficacy-of-the-ethyl-acetate-extract-from-the-traditional-chinese-medicine-herb-celastrus-orbiculatus-against-human-gastric-cancer
#1
Haibo Wang, Lide Tao, Tengyang Ni, Hao Gu, Feng Jin, Xiaojun Dai, Jun Feng, Yanbing Ding, Weiming Xiao, Shiyu Guo, Tadashi Hisamitsu, Yayun Qian, Yanqing Liu
ETHNOPHARMACOLOGICAL RELEVANCE: The traditional Chinese medicine (TCM) herb Celastrus orbiculatus is an important folk medicinal plant in China that has been used as an anti-inflammatory, antitumor, and analgesic in various diseases. The ethyl acetate extract of C. orbiculatus (C. orbiculatus extract, COE) was reported to show significant antitumor effects. However, no study in China or abroad has reported the effect and mechanism of COE in triggering apoptosis of gastric cancer (GC) cells...
May 2, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28442256/functional-evaluation-of-synthetic-flavonoids-and-chalcones-for-potential-antiviral-and-anticancer-properties
#2
Nelly Mateeva, Suresh V K Eyunni, Kinfe K Redda, Ucheze Ononuju, Tony D Hansberry, Cecilia Aikens, Anita Nag
Flavonoids, stilbenes, and chalcones are plant secondary metabolites that often possess diverse biological activities including anti-inflammatory, anti-cancer, and anti-viral activities. The wide range of bioactivities poses a challenge to identify their targets. Here, we studied a set of synthetically generated flavonoids and chalcones to evaluate for their biological activity, and compared similarly substituted flavonoids and chalcones. Substituted chalcones, but not flavonoids, showed inhibition of viral translation without significantly affecting viral replication in cells infected with hepatitis C virus (HCV)...
April 13, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28400511/shprh-regulates-rrna-transcription-by-recognizing-the-histone-code-in-an-mtor-dependent-manner
#3
Deokjae Lee, Jungeun An, Young-Un Park, Hungjiun Liaw, Roger Woodgate, Jun Hong Park, Kyungjae Myung
Many DNA repair proteins have additional functions other than their roles in DNA repair. In addition to catalyzing PCNA polyubiquitylation in response to the stalling of DNA replication, SHPRH has the additional function of facilitating rRNA transcription by localizing to the ribosomal DNA (rDNA) promoter in the nucleoli. SHPRH was recruited to the rDNA promoter using its plant homeodomain (PHD), which interacts with histone H3 when the fourth lysine of H3 is not trimethylated. SHPRH enrichment at the rDNA promoter was inhibited by cell starvation, by treatment with actinomycin D or rapamycin, or by depletion of CHD4...
April 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28392768/cannabidiol-reduces-leukemic-cell-size-but-is-it-important
#4
Nikoletta Kalenderoglou, Tara Macpherson, Karen L Wright
The anti-cancer effect of the plant-derived cannabinoid, cannabidiol, has been widely demonstrated both in vivo and in vitro. However, this body of preclinical work has not been translated into clinical use. Key issues around this failure can be related to narrow dose effects, the cell model used and incomplete efficacy. A model of acute lymphoblastic disease, the Jurkat T cell line, has been used extensively to study the cannabinoid system in the immune system and cannabinoid-induced apoptosis. Using these cells, this study sought to investigate the outcome of those remaining viable cells post-treatment with cannabidiol, both in terms of cell size and tracking any subsequent recovery...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28369573/translatome-analysis-of-an-nb-lrr-immune-response-identifies-important-contributors-to-plant-immunity-in-arabidopsis
#5
Louis-Valentin Meteignier, Mohamed El Oirdi, Mathias Cohen, Teura Barff, Dominick Matteau, Jean-François Lucier, Sébastien Rodrigue, Pierre-Etienne Jacques, Keiko Yoshioka, Peter Moffett
An important branch of plant immunity involves the recognition of pathogens by nucleotide-binding, leucine-rich repeat (NB-LRR) proteins. However, signaling events downstream of NB-LRR activation are poorly understood. We have analysed the Arabidopsis translatome using ribosome affinity purification and RNA sequencing. Our results show that the translational status of hundreds of transcripts is differentially affected upon activation of the NB-LRR protein RPM1, showing an overall pattern of a switch away from growth-related activities to defense...
March 28, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28336950/dual-regulation-of-water-retention-and-cell-growth-by-a-stress-associated-protein-sap-gene-in-prunus
#6
Alba Lloret, Ana Conejero, Carmen Leida, César Petri, Francisco Gil-Muñoz, Lorenzo Burgos, María Luisa Badenes, Gabino Ríos
We have identified a gene (PpSAP1) of Prunus persica coding for a stress-associated protein (SAP) containing Zn-finger domains A20 and AN1. SAPs have been described as regulators of the abiotic stress response in plant species, emerging as potential candidates for improvement of stress tolerance in plants. PpSAP1 was highly expressed in leaves and dormant buds, being down-regulated before bud dormancy release. PpSAP1 expression was moderately induced by water stresses and heat in buds. In addition, it was found that PpSAP1 strongly interacts with polyubiquitin proteins in the yeast two-hybrid system...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300756/oleanolic-acid-alters-multiple-cell-signaling-pathways-implication-in-cancer-prevention-and-therapy
#7
REVIEW
Lovro Žiberna, Dunja Šamec, Andrei Mocan, Seyed Fazel Nabavi, Anupam Bishayee, Ammad Ahmad Farooqi, Antoni Sureda, Seyed Mohammad Nabavi
Nowadays, much attention has been paid to diet and dietary supplements as a cost-effective therapeutic strategy for prevention and treatment of a myriad of chronic and degenerative diseases. Rapidly accumulating scientific evidence achieved through high-throughput technologies has greatly expanded the understanding about the multifaceted nature of cancer. Increasingly, it is being realized that deregulation of spatio-temporally controlled intracellular signaling cascades plays a contributory role in the onset and progression of cancer...
March 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28285138/molecular-details-of-the-raptor-binding-motif-on-arabidopsis-s6-kinase
#8
Ora Son, Sunghan Kim, Yoon-Sun Hur, Choong-Ill Cheon
A putative raptor-binding fragment was identified from Arabidopsis S6 kinase 1 (AtS6K1) N-terminal domain in our previous study. Here, we report a further characterization of this fragment, which identified a 12-amino acid core element absolutely required for the interaction. Although the amino acid sequence of the element per se had no significant homology with the canonical consensus of the TOS (TOR-signaling) motif found in the mammalian TOR (target of rapamycin) kinase substrates, its overall sequence composition is similar to that of the TOS motif in that the acidic and non-polar amino acids residues are arranged in alternating fashion and having one or two of the bulky hydrophobic amino acid (F) buried in the interior...
April 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28258023/importance-of-ros-mediated-autophagy-in-determining-apoptotic-cell-death-induced-by-physapubescin-b
#9
Jian Xu, Yihua Wu, Guang Lu, Shujun Xie, Zhongjun Ma, Zhe Chen, Han-Ming Shen, Dajing Xia
Physapubescin B, a steroidal compound extracted from the plant Physalis pubescens L. (Solanaceae), has been reported to possess anti-cancer potential, whereas the molecular mechanism remains elusive. In this study, we first demonstrated that physapubescin B induced autophagy in human cancer cells based on the evidence that physapubescin B increased lipidation of microtubule-associated protein 1 light chain 3 (LC3) as well as number of GFP-LC3 puncta. We further examined the molecular mechanisms and found that physapubescin B enhanced the autophagic flux through promotion of reactive oxygen species (ROS)-mediated suppression of mammalian target of rapamycin complex I (mTORC1), the key negative regulator of autophagy...
February 24, 2017: Redox Biology
https://www.readbyqxmd.com/read/28246118/gtpase-rop2-binds-and-promotes-activation-of-target-of-rapamycin-tor-in-response-to-auxin
#10
Mikhail Schepetilnikov, Joelle Makarian, Ola Srour, Angèle Geldreich, Zhenbiao Yang, Johana Chicher, Philippe Hammann, Lyubov A Ryabova
Target of rapamycin (TOR) promotes reinitiation at upstream ORFs (uORFs) in genes that play important roles in stem cell regulation and organogenesis in plants. Here, we report that the small GTPase ROP2, if activated by the phytohormone auxin, promotes activation of TOR, and thus translation reinitiation of uORF-containing mRNAs. Plants with high levels of active ROP2, including those expressing constitutively active ROP2 (CA-ROP2), contain high levels of active TOR ROP2 physically interacts with and, when GTP-bound, activates TOR in vitro TOR activation in response to auxin is abolished in ROP-deficient rop2 rop6 ROP4 RNAi plants...
April 3, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28230163/ectopic-expression-of-arabidopsis-target-of-rapamycin-attor-improves-water-use-efficiency-and-yield-potential-in-rice
#11
Achala Bakshi, Mazahar Moin, M Udaya Kumar, Aramati Bindu Madhava Reddy, Maozhi Ren, Raju Datla, E A Siddiq, P B Kirti
The target of Rapamycin (TOR) present in all eukaryotes is a multifunctional protein, regulating growth, development, protein translation, ribosome biogenesis, nutrient, and energy signaling. In the present study, ectopic expression of TOR gene of Arabidopsis thaliana in a widely cultivated indica rice resulted in enhanced plant growth under water-limiting conditions conferring agronomically important water-use efficiency (WUE) trait. The AtTOR high expression lines of rice exhibited profuse tillering, increased panicle length, increased plant height, high photosynthetic efficiency, chlorophyll content and low ∆(13)C...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28223530/differential-tor-activation-and-cell-proliferation-in-arabidopsis-root-and-shoot-apexes
#12
Xiaojuan Li, Wenguo Cai, Yanlin Liu, Hui Li, Liwen Fu, Zengyu Liu, Lin Xu, Hongtao Liu, Tongda Xu, Yan Xiong
The developmental plasticity of plants relies on the remarkable ability of the meristems to integrate nutrient and energy availability with environmental signals. Meristems in root and shoot apexes share highly similar molecular players but are spatially separated by soil. Whether and how these two meristematic tissues have differential activation requirements for local nutrient, hormone, and environmental cues (e.g., light) remain enigmatic in photosynthetic plants. Here, we report that the activation of root and shoot apexes relies on distinct glucose and light signals...
March 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28112451/calreticulin-is-a-fine-tuning-molecule-in-epibrassinolide-induced-apoptosis-through-activating-endoplasmic-reticulum-stress-in-colon-cancer-cells
#13
Pinar Obakan-Yerlikaya, Elif Damla Arisan, Ajda Coker-Gurkan, Kaan Adacan, Utku Ozbey, Berna Somuncu, Didem Baran, Narcin Palavan-Unsal
Epibrassinolide (EBR), a member of brassinostreoids plant hormones with cell proliferation promoting role in plants, is a natural polyhydroxysteroid with structural similarity to steroid hormones of vertebrates. EBR has antiproliferative and apoptosis-inducing effect in various cancer cells. Although EBR has been shown to affect survival and mitochondria-mediated apoptosis pathways in a p53-independent manner, the exact molecular targets of EBR are still under investigation. Our recent SILAC (Stable Isotope Labeling by Amino Acids in Cell Culture) data showed that the most significantly altered protein after EBR treatment was calreticulin (CALR)...
June 2017: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/28072818/glucose-abl1-tor-signaling-modulates-cell-cycle-tuning-to-control-terminal-appressorial-cell-differentiation
#14
Margarita Marroquin-Guzman, Guangchao Sun, Richard A Wilson
The conserved target of rapamycin (TOR) pathway integrates growth and development with available nutrients, but how cellular glucose controls TOR function and signaling is poorly understood. Here, we provide functional evidence from the devastating rice blast fungus Magnaporthe oryzae that glucose can mediate TOR activity via the product of a novel carbon-responsive gene, ABL1, in order to tune cell cycle progression during infection-related development. Under nutrient-free conditions, wild type (WT) M. oryzae strains form terminal plant-infecting cells (appressoria) at the tips of germ tubes emerging from three-celled spores (conidia)...
January 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28027512/shaping-plant-development-through-the-snrk1-tor-metabolic-regulators
#15
REVIEW
Elena Baena-González, Johannes Hanson
SnRK1 (Snf1-related protein kinase 1) and TOR (target of rapamycin) are evolutionarily conserved protein kinases that lie at the heart of energy sensing, playing central and antagonistic roles in the regulation of metabolism and gene expression. Increasing evidence links these metabolic regulators to numerous aspects of plant development, from germination to flowering and senescence. This prompts the hypothesis that SnRK1 and TOR modify developmental programs according to the metabolic status to adjust plant growth to a specific environment...
February 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/27917191/tomato-fk506-binding-protein-12kd-fkbp12-mediates-the-interaction-between-rapamycin-and-target-of-rapamycin-tor
#16
Fangjie Xiong, Pan Dong, Mei Liu, Gengxin Xie, Kai Wang, Fengping Zhuo, Li Feng, Lu Yang, Zhengguo Li, Maozhi Ren
Target of Rapamycin (TOR) signaling is an important regulator in multiple organisms including yeast, plants, and animals. However, the TOR signaling in plants is much less understood as compared to that in yeast and animals. TOR kinase can be efficiently suppressed by rapamycin in the presence of functional FK506 Binding Protein 12 KD (FKBP12) in yeast and animals. In most examined higher plants rapamycin fails to inhibit TOR kinase due to the non-functional FKBP12. Here we find that tomato plants showed obvious growth inhibition when treated with rapamycin and the inhibitory phenotype is similar to suppression of TOR causing by active-site TOR inhibitors (asTORis) such as KU63794, AZD8055, and Torin1...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27891093/targeting-strategies-for-renal-cell-carcinoma-from-renal-cancer-cells-to-renal-cancer-stem-cells
#17
REVIEW
Zhi-Xiang Yuan, Jingxin Mo, Guixian Zhao, Gang Shu, Hua-Lin Fu, Wei Zhao
Renal cell carcinoma (RCC) is a common form of urologic tumor that originates from the highly heterogeneous epithelium of renal tubules. Over the last decade, targeting therapies to renal cancer cells have transformed clinical care for RCC. Recently, it was proposed that renal cancer stem cells (CSCs) isolated from renal carcinomas were responsible for driving tumor growth and resistance to conventional chemotherapy and radiotherapy, according to the theory of CSCs; this has provided the rationale for therapies targeting this aggressive cell population...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27877176/the-arabidopsis-tor-kinase-specifically-regulates-the-expression-of-nuclear-genes-coding-for-plastidic-ribosomal-proteins-and-the-phosphorylation-of-the-cytosolic-ribosomal-protein-s6
#18
Thomas Dobrenel, Eder Mancera-Martínez, Céline Forzani, Marianne Azzopardi, Marlène Davanture, Manon Moreau, Mikhail Schepetilnikov, Johana Chicher, Olivier Langella, Michel Zivy, Christophe Robaglia, Lyubov A Ryabova, Johannes Hanson, Christian Meyer
Protein translation is an energy consuming process that has to be fine-tuned at both the cell and organism levels to match the availability of resources. The target of rapamycin kinase (TOR) is a key regulator of a large range of biological processes in response to environmental cues. In this study, we have investigated the effects of TOR inactivation on the expression and regulation of Arabidopsis ribosomal proteins at different levels of analysis, namely from transcriptomic to phosphoproteomic. TOR inactivation resulted in a coordinated down-regulation of the transcription and translation of nuclear-encoded mRNAs coding for plastidic ribosomal proteins, which could explain the chlorotic phenotype of the TOR silenced plants...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27856705/the-plant-energy-sensor-evolutionary-conservation-and-divergence-of-snrk1-structure-regulation-and-function
#19
REVIEW
Tom Broeckx, Sander Hulsmans, Filip Rolland
The SnRK1 (SNF1-related kinase 1) kinases are the plant cellular fuel gauges, activated in response to energy-depleting stress conditions to maintain energy homeostasis while also gatekeeping important developmental transitions for optimal growth and survival. Similar to their opisthokont counterparts (animal AMP-activated kinase, AMPK, and yeast Sucrose Non-Fermenting 1, SNF), they function as heterotrimeric complexes with a catalytic (kinase) α subunit and regulatory β and γ subunits. Although the overall configuration of the kinase complexes is well conserved, plant-specific structural modifications (including a unique hybrid βγ subunit) and associated differences in regulation reflect evolutionary divergence in response to fundamentally different lifestyles...
December 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27812096/experimental-evolution-reveals-interplay-between-sch9-and-polyploid-stability-in-yeast
#20
Yi-Jin Lu, Krishna B S Swamy, Jun-Yi Leu
Polyploidization has crucial impacts on the evolution of different eukaryotic lineages including fungi, plants and animals. Recent genome data suggest that, for many polyploidization events, all duplicated chromosomes are maintained and genome reorganizations occur much later during evolution. However, newly-formed polyploid genomes are intrinsically unstable and often quickly degenerate into aneuploidy or diploidy. The transition between these two states remains enigmatic. In this study, laboratory evolution experiments were conducted to investigate this phenomenon...
November 2016: PLoS Genetics
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