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https://www.readbyqxmd.com/read/28727798/cloning-and-expression-of-genes-encoding-heat-shock-proteins-in-liriomyza-trifolii-and-comparison-with-two-congener-leafminer-species
#1
Ya-Wen Chang, Jing-Yun Chen, Ming-Xing Lu, Yuan Gao, Zi-Hua Tian, Wei-Rong Gong, Chang-Sheng Dong, Yu-Zhou Du
The polyphagous agromyzid fly, Liriomyza trifolii, is a significant and important insect pest of ornamental and vegetable crops worldwide. The adaptation of insects to different environments is facilitated by heat shock proteins (HSPs), which play an important role in acclimation to thermal stress. In this study, we cloned and characterized five HSP-encoding genes of L. trifolii (Lthsp20, Lthsp40, Lthsp60, Lthsp70, and Lthsp90) and monitored their expression under different thermal stresses using real-time quantitative PCR...
2017: PloS One
https://www.readbyqxmd.com/read/28725639/anaplasma-phagocytophilum-msp4-and-hsp70-proteins-are-involved-in-interactions-with-host-cells-during-pathogen-infection
#2
Marinela Contreras, Pilar Alberdi, Lourdes Mateos-Hernández, Isabel G Fernández de Mera, Ana L García-Pérez, Marie Vancová, Margarita Villar, Nieves Ayllón, Alejandro Cabezas-Cruz, James J Valdés, Snorre Stuen, Christian Gortazar, José de la Fuente
Anaplasma phagocytophilum transmembrane and surface proteins play a role during infection and multiplication in host neutrophils and tick vector cells. Recently, A. phagocytophilum Major surface protein 4 (MSP4) and Heat shock protein 70 (HSP70) were shown to be localized on the bacterial membrane, with a possible role during pathogen infection in ticks. In this study, we hypothesized that A. phagocytophilum MSP4 and HSP70 have similar functions in tick-pathogen and host-pathogen interactions. To address this hypothesis, herein we characterized the role of these bacterial proteins in interaction and infection of vertebrate host cells...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28724629/abrogation-of-heat-shock-factor-1-hsf1-phosphorylation-deregulates-its-activity-and-lowers-activation-threshold-leading-to-obesity-in-mice
#3
Xiongjie Jin, Aijun Qiao, Demetrius Moskophidis, Nahid F Mivechi
Heat shock factor 1 (Hsf1) is transcriptionally activated following exposure of mammalian cells to environmental insults and pathological conditions. The function of Hsf1 as a protector of cells and organisms towards a range of stress stimuli has been well-documented. However, how different Hsf1 post-transcriptional modifications affect its function in vivo is not understood. Hsf1 transcriptional activity is in part regulated by phosphorylation. Hsf1 phosphorylation of amino acid residues at S303 and S307 has been shown to repress Hsf1 transcriptional activity under normal physiological growth conditions...
July 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28723944/application-of-mass-spectrometry-to-elucidate-the-pathophysiology-of-encephalitozoon-cuniculi-infection-in-rabbits
#4
Guillaume Desoubeaux, Maria Del Carmen Piqueras, Ana Pantin, Sanjoy K Bhattacharya, Roman Peschke, Anja Joachim, Carolyn Cray
Encephalitozoon cuniculi is a microsporidian species which can induce subclinical to serious disease in mammals including rabbits, a definitive natural host. The pathophysiology of infection has not been comprehensively elucidated. In this exploratory study, we utilized two mass spectrometry approaches: first, the analysis of the humoral response by profiling the microsporidian antigens as revealed by Western blot screening, and second, implementing the iTRAQ®-labeling protocol to focus on the changes within the host proteome during infection...
2017: PloS One
https://www.readbyqxmd.com/read/28723223/free-energy-of-binding-and-mechanism-of-interaction-for-the-meevd-tpr2a-peptide-protein-complex
#5
Mauro Lapelosa
The association between the MEEVD C-terminal peptide from the heat shock protein 90 (Hsp90) and tetratricopeptide repeat A (TPR2A) domain of the heat shock organizing protein (Hop) is a useful prototype to study the fundamental molecular details about the Hop-Hsp90 interaction. We study here the mechanism of binding/unbinding, and compute the standard binding free energy and potential of mean force for the association of the MEEVD peptide to the TPR2A domain using the Adaptive Biasing Force (ABF) methodology...
July 19, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28722776/esterified-trehalose-analogs-protect-mammalian-cells-from-heat-shock
#6
Jack T Bragg, Hannah K D'Ambrosio, Timothy J Smith, Caroline A Gorka, Faraz A Khan, Joshua T Rose, Andrew J Rouff, Terence S Fu, Brittany J Bisnett, Michael Boyce, Sudhir Khetan, Margot G Paulick
Trehalose is a disaccharide that is produced by many organisms to better enable them to survive environmental stresses, including heat, cold, desiccation, and reactive oxygen species. Mammalian cells do not naturally biosynthesize trehalose; however, when introduced into mammalian cells, trehalose provides protection from the damages associated with freezing and drying. One of the major difficulties in using trehalose as a cellular protectant for mammalian cells is the delivery of this disaccharide into the intracellular environment; mammalian cell membranes are impermeable to the hydrophilic sugar trehalose...
July 19, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28721857/stress-adaptation
#7
Alistair J P Brown, Leah E Cowen, Antonio di Pietro, Janet Quinn
Fungal species display an extraordinarily diverse range of lifestyles. Nevertheless, the survival of each species depends on its ability to sense and respond to changes in its natural environment. Environmental changes such as fluctuations in temperature, water balance or pH, or exposure to chemical insults such as reactive oxygen and nitrogen species exert stresses that perturb cellular homeostasis and cause molecular damage to the fungal cell. Consequently, fungi have evolved mechanisms to repair this damage, detoxify chemical insults, and restore cellular homeostasis...
July 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28721580/gene-expression-profiles-of-the-thermotolerant-yeast-saccharomyces-cerevisiae-strain-kku-vn8-during-high-temperature-ethanol-fermentation-using-sweet-sorghum-juice
#8
Atiya Techaparin, Pornthap Thanonkeo, Preekamol Klanrit
OBJECTIVES: To investigate gene expression profiles of the thermotolerant yeast Saccharomyces cerevisiae strain KKU-VN8, a potential high-ethanol producer, in response to various stresses during high-temperature ethanol fermentation using sweet sorghum juice (SSJ) under optimal conditions. RESULTS: The maximal ethanol concentration obtained by S. cerevisiae KKU-VN8 using SSJ at 40 °C was 66.6 g/l, with a productivity of 1.39 g/l/h and a theoretical ethanol yield of 81%...
July 18, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28720498/rna-aptamers-targeted-for-human-%C3%AE-a-crystallin-do-not-bind-%C3%AE-b-crystallin-and-spare-the-%C3%AE-crystallin-domain
#9
Prabhat K Mallik, Hua Shi, Jayanti Pande
The molecular chaperones, α-crystallins, belong to the small heat shock protein (sHSP) family and prevent the aggregation and insolubilization of client proteins. Studies in vivo have shown that the chaperone activity of the α-crystallins is raised or lowered in various disease states. Therefore, the development of tools to control chaperone activity may provide avenues for therapeutic intervention, as well as enable a molecular understanding of chaperone function. The major human lens α-crystallins, αA- (HAA) and αB- (HAB), share 57% sequence identity and show similar activity towards some clients, but differing activities towards others...
July 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28720296/urinary-heat-shock-protein-72-as-a-biomarker-of-acute-kidney-injury-in-dogs
#10
Yaron Bruchim, Yochai Avital, Michal Horowitz, Michal Mazaki-Tovi, Itamar Aroch, Gilad Segev
Early recognition of acute kidney injury (AKI) is important, as therapy is potentially more efficacious if instituted early in the course of disease. Urinary heat shock protein-72 to urinary creatinine ratio (uHSP72/uCr) was assessed as a diagnostic and prognostic marker in AKI in dogs. Fifty-three dogs were enrolled in five groups: healthy controls (n=11), urinary tract infection (n=10), chronic kidney disease (CKD; n=11), AKI (n=13), and acute decompensating CKD (n=8). Urinary heat shock protein-72 to urinary creatinine ratio was highest in the AKI group (P<0...
July 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28719870/effects-of-endocrine-disrupting-chemicals-on-estrogen-receptor-alpha-and-heat-shock-protein-60-gene-expression-in-primary-cultures-of-loggerhead-sea-turtle-caretta-caretta-erythrocytes
#11
Paolo Cocci, Martina Capriotti, Gilberto Mosconi, Francesco Alessandro Palermo
The loggerhead turtle (Caretta caretta) can be considered a good indicator species for studying the ecological impact of endocrine disrupting chemicals (EDCs) on wildlife. However, the effect of these environmental pollutants on nuclear steroid hormone signaling has not yet been addressed in sea turtles mainly due to the legal constraints of their endangered status. Here we describe the use of primary erythrocyte cell cultures as in vitro models for evaluating the effects of different EDCs on the expression of estrogen receptor α (ERα)...
July 15, 2017: Environmental Research
https://www.readbyqxmd.com/read/28718351/exosomal-hsp60-a-potentially-useful-biomarker-for-diagnosis-assessing-prognosis-and-monitoring-response-to-treatment
#12
Caruso Bavisotto, F Cappello, Ajl Macario, E Conway de Macario, M Logozzi, S Fais, C Campanella
Cell-to-cell communication is imperative for life and it is mediated by sending and receiving information via the secretion and subsequent receptor-mediated detection of biological molecules. Exosomes (EXs) secreted from cells to the extracellular environment play an important role in intercellular communication in normal and pathological conditions. Areas covered: New evidence indicates that tumor cells-derived EXs contribute to cancer progression through the modulation of tumor microenvironment. The exosomal heat shock protein 60 (HSP60) is very likely a key player in intercellular cross-talk, particularly during the progress of diseases, such as cancer...
July 18, 2017: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/28718257/risk-factors-for-heat-related-deaths-during-the-june-2015-heat-wave-in-karachi-pakistan
#13
Syed Ghazanfar Saleem, Tehreem Ansari, Ashraf Shamshad Ali, Sara Fatima, Mariam Hassan Rizvi, Muhammad Abdul Samad
BACKGROUND: Mortality as a consequence of heat related illness is a public health concern. Emergency department (ED) experiences increased patients' flow and decreased survival as a consequence of heat stroke during the episodes of heat wave. The present study was conducted to identify the risk factors for mortality among victims of heat wave (17th - 23rd June), 2015 evaluated in the Emergency Department of The Indus Hospital (TIH), Karachi. METHODS: In this cross-sectional study data was retrospectively collected...
April 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28717943/a-pyrrole-based-natural-small-molecule-mitigates-hsp90-expression-in-mda-mb-231-cells-and-inhibits-tumor-angiogenesis-in-mice-by-inactivating-hsf-1
#14
K C Rashmi, H S Atreya, M Harsha Raj, Bharathi P Salimath, H S Aparna
Heat shock proteins (HSPs), molecular chaperones, are crucial for the cancer cells to facilitate proper functioning of various oncoproteins involved in cell survival, proliferation, migration, and tumor angiogenesis. Tumor cells are said to be "addicted" to HSPs. HSPs are overexpressed in many cancers due to upregulation of transcription factor Heat-shock factor 1 (HSF-1), the multifaceted master regulator of heat shock response. Therefore, pharmacological targeting of HSPs via HSF-1 is an effective strategy to treat malignant cancers like triple negative breast cancer...
July 17, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28717426/extracellular-vesicles-released-following-heat-stress-induce-bystander-effect-in-unstressed-populations
#15
Findlay Bewicke-Copley, Laura Ann Mulcahy, Laura Ann Jacobs, Priya Samuel, Naveed Akbar, Ryan Charles Pink, David Raul Francisco Carter
Cells naïve to stress can display the effects of stress, such as DNA damage and apoptosis, when they are exposed to signals from stressed cells; this phenomenon is known as the bystander effect. We previously showed that bystander effect induced by ionising radiation are mediated by extracellular vesicles (EVs). Bystander effect can also be induced by other types of stress, including heat shock, but it is unclear whether EVs are involved. Here we show that EVs released from heat shocked cells are also able to induce bystander damage in unstressed populations...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28717416/feasibility-of-urinary-extracellular-vesicle-proteome-profiling-using-a-robust-and-simple-clinically-applicable-isolation-method
#16
Irene V Bijnsdorp, Olga Maxouri, Aarzo Kardar, Tim Schelfhorst, Sander R Piersma, Thang V Pham, Andre Vis, R Jeroen van Moorselaar, Connie R Jimenez
Extracellular vesicles (EVs) secreted by prostate cancer (PCa) cells contain specific biomarkers and can be isolated from urine. Collection of urine is not invasive, and therefore urinary EVs represent a liquid biopsy for diagnostic and prognostic testing for PCa. In this study, we optimised urinary EV isolation using a method based on heat shock proteins and compared it to gold-standard ultracentrifugation. The urinary EV isolation protocol using the Vn96-peptide is easier, time convenient (≈1.5 h) and no special equipment is needed, in contrast to ultracentrifugation protocol (>3...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28717248/loss-of-type-9-adenylyl-cyclase-triggers-reduced-phosphorylation-of-hsp20-and-diastolic-dysfunction
#17
Yong Li, Tanya A Baldwin, Yan Wang, Janani Subramaniam, Anibal Garza Carbajal, Cameron S Brand, Shane R Cunha, Carmen W Dessauer
Adenylyl cyclase type 9 (AC9) is found tightly associated with the scaffolding protein Yotiao and the IKs ion channel in heart. But apart from potential IKs regulation, physiological roles for AC9 are unknown. We show that loss of AC9 in mice reduces less than 3% of total AC activity in heart but eliminates Yotiao-associated AC activity. AC9(-/-) mice exhibit no structural abnormalities but show a significant bradycardia, consistent with AC9 expression in sinoatrial node. Global changes in PKA phosphorylation patterns are not altered in AC9(-/-) heart, however, basal phosphorylation of heat shock protein 20 (Hsp20) is significantly decreased...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715921/the-role-of-secreted-heat-shock-protein-90-hsp90-in-wound-healing-how-could-it-shape-future-therapeutics
#18
Jiacong Guo, Cheng Chang, Wei Li
Defects in tissue repair or wound healing pose a clinical, economic and social problem worldwide. Despite decades of studies, there have been few effective therapeutic treatments. Areas covered: We discuss the possible reasons for why growth factor therapy did not succeed. We point out the lack of human disorder-relevant animal models as another blockade for therapeutic development. We summarize the recent discovery of secreted heat shock protein-90 (Hsp90) as a novel wound healing agent. Expert commentary: Wound healing is a highly complex and multistep process that requires participations of many cell types, extracellular matrices and soluble molecules to work together in a spatial and temporal fashion within the wound microenvironment...
July 18, 2017: Expert Review of Proteomics
https://www.readbyqxmd.com/read/28715732/proteasome-inhibitor-induced-cleavage-of-hsp90-is-mediated-by-ros-generation-and-caspase-10-activation-in-human-leukemic-cells
#19
Sangkyu Park, Jeong-A Park, Hwanmin Yoo, Han-Bum Park, Younghee Lee
Heat shock protein 90 (HSP90) is a molecular chaperone that supports the stability of client proteins. The proteasome is one of the targets for cancer therapy, and studies are underway to use proteasome inhibitors as anti-cancer drugs. In this study, we found that HSP90 was cleaved to a 55kDa protein after treatment with proteasome inhibitors including MG132 in leukemia cells but was not cleaved in other tissue-derived cells. HSP90 has two major isoforms (HSP90α and HSP90β), and both were cleaved by MG132 treatment...
July 12, 2017: Redox Biology
https://www.readbyqxmd.com/read/28714602/genome-wide%C3%A2-identification-and-characterization%C3%A2-of%C3%A2-hsp-gene-superfamily-in-whitefly-bemisia-tabaci-and-expression-profiling%C3%A2-analysis%C3%A2-under-temperature-stress
#20
Xin-Ru Wang, Chao Wang, Fei-Xue Ban, Dan-Tong Zhu, Shu-Sheng Liu, Xiao-Wei Wang
Heat shock proteins (Hsp) are essential molecular chaperones that play important roles in the stress stimulation of insects. Bemisia tabaci, a phloem feeder and invasive species, can cause extensive crop damage through direct feeding and transmission of plant viruses. Here we employed comprehensive genomics approaches to identity HSP superfamily members in Middle East Asia Minor 1 whitefly genome. In total, we identified 26 Hsp genes, including 3 Hsp90, 17 Hsp70, 1 Hsp60 and 5 sHSP (small heat shock protein, sHSP) genes...
July 17, 2017: Insect Science
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