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Cell Stress & Chaperones

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https://www.readbyqxmd.com/read/28324352/the-six-tomato-yellow-leaf-curl-virus-genes-expressed-individually-in-tomato-induce-different-levels-of-plant-stress-response-attenuation
#1
Rena Gorovits, Adi Moshe, Linoy Amrani, Rotem Kleinberger, Ghandi Anfoka, Henryk Czosnek
Tomato yellow leaf curl virus (TYLCV) is a begomovirus infecting tomato plants worldwide. TYLCV needs a healthy host environment to ensure a successful infection cycle for long periods. Hence, TYLCV restrains its destructive effect and induces neither a hypersensitive response nor cell death in infected tomatoes. On the contrary, TYLCV counteracts cell death induced by other factors, such as inactivation of HSP90 functionality. Suppression of plant death is associated with the inhibition of the ubiquitin 26S proteasome degradation and with a deactivation of the heat shock transcription factor HSFA2 pathways (including decreased HSP17 levels)...
March 21, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28303510/enhanced-resistance-against-vibrio-harveyi-infection-by-carvacrol-and-its-association-with-the-induction-of-heat-shock-protein-72-in-gnotobiotic-artemia-franciscana
#2
Kartik Baruah, Parisa Norouzitallab, Ho Phuong Pham Duy Phong, Guy Smagghe, Peter Bossier
Induction of HSP72 is a natural response of stressed organisms that protects against many insults including bacterial diseases in farm (aquatic) animals. It would therefore be of great health benefit to search for natural compounds that are clinically safe yet able to induce HSP72 in animals. The phenolic compound carvacrol, an approved food component, had been shown in in vitro study to act as a co-inducer of HSP72, enhancing HSP72 production only in combination with a bona fide stress compared to the compound alone...
March 16, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28285429/hypothermia-decreased-the-expression-of-heat-shock-proteins-in-neonatal-rat-model-of-hypoxic-ischemic-encephalopathy
#3
Byong Sop Lee, Euiseok Jung, Yeonjoo Lee, Sung-Hoon Chung
Hypothermia (HT) is a well-established neuroprotective strategy against neonatal hypoxic ischemic encephalopathy (HIE). The overexpression of heat shock proteins (HSP) has been shown to provide neuroprotection in animal models of stroke. We aimed to investigate the effect of HT on HSP70 and HSP27 expression in a neonatal rat model of HIE. Seven-day-old rat pups were exposed to hypoxia for 90 min to establish the Rice-Vannucci model and were assigned to the following four groups: hypoxic injury (HI)-normothermia (NT, 36 °C), HI-HT (30 °C), sham-NT, and sham-HT...
March 11, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28283895/influence-of-the-pde5-inhibitor-tadalafil-on-redox-status-and-antioxidant-defense-system-in-c2c12-skeletal-muscle-cells
#4
Guglielmo Duranti, Roberta Ceci, Paolo Sgrò, Stefania Sabatini, Luigi Di Luigi
Phosphodiesterase type 5 inhibitors (PDE5Is), widely known for their beneficial effects onto male erectile dysfunction, seem to exert favorable effects onto metabolism as well. Tadalafil exposure increases oxidative metabolism of C2C12 skeletal muscle cells. A rise in fatty acid (FA) metabolism, requiring more oxygen, could induce a larger reactive oxygen species (ROS) release as a byproduct thus leading to a redox imbalance. The aim of this study was to determine how PDE5I tadalafil influences redox status in skeletal muscle cells to match the increasing oxidative metabolism...
March 11, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28275944/fine-tuning-of-actin-dynamics-by-the-hspb8-bag3-chaperone-complex-facilitates-cytokinesis-and-contributes-to-its-impact-on-cell-division
#5
Alice Anaïs Varlet, Margit Fuchs, Carole Luthold, Herman Lambert, Jacques Landry, Josée N Lavoie
The small heat shock protein HSPB8 and its co-chaperone BAG3 are proposed to regulate cytoskeletal proteostasis in response to mechanical signaling in muscle cells. Here, we show that in dividing cells, the HSPB8-BAG3 complex is instrumental to the accurate disassembly of the actin-based contractile ring during cytokinesis, a process required to allow abscission of daughter cells. Silencing of HSPB8 markedly decreased the mitotic levels of BAG3 in HeLa cells, supporting its crucial role in BAG3 mitotic functions...
March 8, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28265807/association-of-heat-stress-protein-90-and-70-gene-polymorphism-with-adaptability-traits-in-indian-sheep-ovis-aries
#6
K M Singh, S Singh, I Ganguly, Raja K Nachiappan, A Ganguly, R Venkataramanan, A Chopra, H K Narula
Heat stress proteins assist cellular proteins in the acquisition of native structure. The present research was conducted to study how thermo-tolerance is modulated by HSP90 and HSP70 gene polymorphism and its association with hemato-physio-biochemical parameters, supported by their expression profiles in Chokla, Magra, Marwari, and Madras Red sheep breeds. Least square analysis revealed significant effect (P < 0.05) of season and breed on all the physiological parameters, i.e., temperature, respiratory rate, and pulse rate (a...
March 6, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28261750/partial-dispensability-of-djp1-s-j-domain-in-peroxisomal-protein-import-in-saccharomyces-cerevisiae-results-from-genetic-redundancy-with-another-class-ii-j-protein-caj1
#7
Neha Dobriyal, Prerna Tripathi, Susrita Sarkar, Yogesh Tak, Amit K Verma, Chandan Sahi
J proteins are obligate co-chaperones of Hsp70s. Via their signature J domain, all J proteins interact with their partner Hsp70s and stimulate their weak ATPase activity, which is vital for Hsp70 functions. The dependency of J proteins on their J domain is such that mutations in critical amino acids in the J domain often results into a null phenotype for a particular J protein. Here, we show that the J domain of Djp1, a cytosolic J protein important for peroxisomal protein import in Saccharomyces cerevisiae, is partially dispensable...
March 6, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28258486/lea-proteins-are-involved-in-cyst-desiccation-resistance-and-other-abiotic-stresses-in-azotobacter-vinelandii
#8
Julieta Rodriguez-Salazar, Soledad Moreno, Guadalupe Espín
Late embryogenesis abundant (LEA) proteins constitute a large protein family that is closely associated with resistance to abiotic stresses in multiple organisms and protect cells against drought and other stresses. Azotobacter vinelandii is a soil bacterium that forms desiccation-resistant cysts. This bacterium possesses two genes, here named lea1 and lea2, coding for avLEA1 and avLEA2 proteins, both containing 20-mer motifs characteristic of eukaryotic plant LEA proteins. In this study, we found that disruption of the lea1 gene caused a loss of the cysts' viability after 3 months of desiccation, whereas at 6 months, wild-type or lea2 mutant strain cysts remained viable...
March 3, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28255900/re-examining-hspc1-inhibitors
#9
Sheah Lin Lee, Nina Claire Dempsey-Hibbert, Dale Vimalachandran, Terence David Wardle, Paul A Sutton, John H H Williams
HSPC1 is a critical protein in cancer development and progression, including colorectal cancer (CRC). However, clinical trial data reporting the effectiveness of HSPC1 inhibitors on several cancer types has not been as successful as predicted. Furthermore, some N-terminal inhibitors appear to be much more successful than others despite similar underlying mechanisms. This study involved the application of three N-terminal HSPC1 inhibitors, 17-DMAG, NVP-AUY922 and NVP-HSP990 on CRC cells. The effects on client protein levels over time were examined...
March 2, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28251488/acute-exercise-boosts-cell-proliferation-and-the-heat-shock-response-in-lymphocytes-correlation-with-cytokine-production-and-extracellular-to-intracellular-hsp70-ratio
#10
Thiago Gomes Heck, Sofia Pizzato Scomazzon, Patrícia Renck Nunes, Cinthia Maria Schöler, Gustavo Stumpf da Silva, Aline Bittencourt, Maria Cristina Faccioni-Heuser, Mauricio Krause, Roberto Barbosa Bazotte, Rui Curi, Paulo Ivo Homem de Bittencourt
Exercise stimulates immune responses, but the appropriate "doses" for such achievements are unsettled. Conversely, in metabolic tissues, exercise improves the heat shock (HS) response, a universal cytoprotective response to proteostasis challenges that are centred on the expression of the 70-kDa family of intracellular heat shock proteins (iHSP70), which are anti-inflammatory. Concurrently, exercise triggers the export of HSP70 towards the extracellular milieu (eHSP70), where they work as pro-inflammatory cytokines...
March 1, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28247072/erratum-to-encapsulated-hsp70-decreases-endotoxin-induced-production-of-ros-and-tnf%C3%AE-in-human-phagocytes
#11
M M Yurinskaya, O Yu Kochetkova, L I Shabarchina, O Yu Antonova, A V Suslikov, M B Evgen'ev, M G Vinokurov
No abstract text is available yet for this article.
February 28, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28220454/the-remarkable-multivalency-of-the-hsp70-chaperones
#12
REVIEW
Erik R P Zuiderweg, Lawrence E Hightower, Jason E Gestwicki
Hsp70 proteins are key to maintaining intracellular protein homeostasis. To carry out this task, they employ a large number of cochaperones and adapter proteins. Here, we review what is known about the interaction between the chaperones and partners, with a strong slant toward structural biology. Hsp70s in general, and Hsc70 (HSPA8) in particular, display an amazing array of interfaces with their protein cofactors. We also review the known interactions between Hsp70s with lipids and with active compounds that may become leads toward Hsp70 modulation for treatment of a variety of diseases...
February 20, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28214988/an-alternative-splice-variant-of-human-%C3%AE-a-crystallin-modulates-the-oligomer-ensemble-and-the-chaperone-activity-of-%C3%AE-crystallins
#13
Waldemar Preis, Annika Bestehorn, Johannes Buchner, Martin Haslbeck
In humans, ten genes encode small heat shock proteins with lens αA-crystallin and αB-crystallin representing two of the most prominent members. The canonical isoforms of αA-crystallin and αB-crystallin collaborate in the eye lens to prevent irreversible protein aggregation and preserve visual acuity. α-Crystallins form large polydisperse homo-oligomers and hetero-oligomers and as part of the proteostasis system bind substrate proteins in non-native conformations, thereby stabilizing them. Here, we analyzed a previously uncharacterized, alternative splice variant (isoform 2) of human αA-crystallin with an exchanged N-terminal sequence...
February 18, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28181153/an-interaction-study-in-mammalian-cells-demonstrates-weak-binding-of-hspb2-to-bag3-which-is-regulated-by-hspb3-and-abrogated-by-hspb8
#14
Federica F Morelli, Laura Mediani, Lonneke Heldens, Jessika Bertacchini, Ilaria Bigi, Arianna Dorotea Carrà, Jonathan Vinet, Serena Carra
The ten mammalian small heat shock proteins (sHSPs/HSPBs) show a different expression profile, although the majority of them are abundant in skeletal and cardiac muscles. HSPBs form hetero-oligomers and homo-oligomers by interacting together and complexes containing, e.g., HSPB2/HSPB3 or HSPB1/HSPB5 have been documented in mammalian cells and muscles. Moreover, HSPB8 associates with the Hsc70/Hsp70 co-chaperone BAG3, in mammalian, skeletal, and cardiac muscle cells. Interaction of HSPB8 with BAG3 regulates its stability and function...
February 8, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28160209/increased-expression-of-microrna-378a-5p-in-acute-ethanol-exposure-of-rat-cardiomyocytes
#15
Zhongkai Wang, Jingwen Song, Liang Zhang, Songqun Huang, Lizhi Bao, Feng Chen, Xianxian Zhao
Alcohol abuse is a risk factor for a distinct form of congestive heart failure, known as alcoholic cardiomyopathy (ACM). Here, we investigate how microRNAs may participate in the induction of cardiomyocyte apoptosis associated with ethanol exposure in vitro. Increasing the concentrations of ethanol to primary rat cardiomyocytes resulted in elevated apoptosis assessed by annexin V and propidium iodide staining, and reduced expression of an enzyme for alcohol detoxification aldehyde dehydrogenase 2 (ALDH2). These ethanol effects were accompanied by a substantial elevation of miR-378a-5p...
February 3, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28155127/attenuation-of-exercise-induced-heat-shock-protein-72-expression-blunts-improvements-in-whole-body-insulin-resistance-in-rats-with-type-2-diabetes
#16
Takamasa Tsuzuki, Hiroyuki Kobayashi, Toshinori Yoshihara, Ryo Kakigi, Noriko Ichinoseki-Sekine, Hisashi Naito
Heat shock proteins (HSPs) play an important role in insulin resistance and improve the cellular stress response via HSP induction by exercise to treat type 2 diabetes. In this study, the effects of exercise-induced HSP72 expression levels on whole-body insulin resistance in type 2 diabetic rats were investigated. Male 25-week-old Otsuka Long-Evans Tokushima Fatty rats were divided into three groups: sedentary (Sed), trained in a thermal-neutral environment (NTr: 25 °C), and trained in a cold environment (CTr: 4 °C)...
February 2, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28144778/mammalian-hspb1-hsp27-is-a-molecular-sensor-linked-to-the-physiology-and-environment-of-the-cell
#17
REVIEW
André-Patrick Arrigo
Constitutively expressed small heat shock protein HspB1 regulates many fundamental cellular processes and plays major roles in many human pathological diseases. In that regard, this chaperone has a huge number of apparently unrelated functions that appear linked to its ability to recognize many client polypeptides that are subsequently modified in their activity and/or half-life. A major parameter to understand how HspB1 is dedicated to interact with particular clients in defined cellular conditions relates to its complex oligomerization and phosphorylation properties...
January 31, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28130664/chaperone-activity-of-human-small-heat-shock-protein-gst-fusion-proteins
#18
Hannah Arbach, Caley Butler, Kathryn A McMenimen
Small heat shock proteins (sHsps) are a ubiquitous part of the machinery that maintains cellular protein homeostasis by acting as molecular chaperones. sHsps bind to and prevent the aggregation of partially folded substrate proteins in an ATP-independent manner. sHsps are dynamic, forming an ensemble of structures from dimers to large oligomers through concentration-dependent equilibrium dissociation. Based on structural studies and mutagenesis experiments, it is proposed that the dimer is the smallest active chaperone unit, while larger oligomers may act as storage depots for sHsps or play additional roles in chaperone function...
January 27, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28120291/role-of-shsps-in-organizing-cytosolic-protein-aggregation-and-disaggregation
#19
REVIEW
Axel Mogk, Bernd Bukau
Small heat shock proteins (sHsps) exhibit an ATP-independent chaperone activity to prevent the aggregation of misfolded proteins in vitro. The seemingly conflicting presence of sHsps in insoluble protein aggregates in cells obstructs a precise definition of sHsp function in proteostasis networks. Recent findings specify sHsp activities in protein quality control systems. The sHsps of yeast, Hsp42 and Hsp26, interact with early unfolding intermediates of substrates, keeping them in a ready-to-refold conformation close to the native state...
January 24, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28116619/hdac6-regulates-sensitivity-to-cell-death-in-response-to-stress-and-post-stress-recovery
#20
Hyun-Wook Ryu, Hye-Rim Won, Dong Hoon Lee, So Hee Kwon
Histone deacetylase 6 (HDAC6) plays an important role in stress responses such as misfolded protein-induced aggresomes, autophagy, and stress granules. However, precisely how HDAC6 manages response during and after cellular stress remains largely unknown. This study aimed to investigate the effect of HDAC6 on various stress and post-stress recovery responses. We showed that HIF-1α protein levels were reduced in HDAC6 knockout (KO) MEFs compared to wild-type (WT) MEFs in hypoxia. Furthermore, under hypoxia, HIF-1α levels were also reduced following rescue with either a catalytically inactive or a ubiqiutin-binding mutant HDAC6...
January 23, 2017: Cell Stress & Chaperones
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