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https://www.readbyqxmd.com/read/28289734/regulatory-mechanisms-of-hsp90
#1
Chrisostomos Prodromou
The ability of Hsp90 to activate a disparate clientele implicates this chaperone in diverse biological processes. To accommodate such varied roles, Hsp90 requires a variety of regulatory mechanisms that are coordinated in order to modulate its activity appropriately. Amongst these, the master-regulator heat shock factor 1 (HSF1) is critically important in upregulating Hsp90 during stress, but is also responsible, through interaction with specific transcription factors (such as STAT1 and Strap/p300) for the integration of a variety of biological signals that ultimately modulate Hsp90 expression...
January 30, 2017: Biochemistry & Molecular Biology Journal
https://www.readbyqxmd.com/read/28249598/the-prognostic-utility-of-the-transcription-factor-srf-in-docetaxel-resistant-prostate-cancer-in-vitro-discovery-and-in-vivo-validation
#2
D J Lundon, A Boland, M Prencipe, G Hurley, A O'Neill, E Kay, S T Aherne, P Doolan, S F Madden, M Clynes, C Morrissey, J M Fitzpatrick, R W Watson
BACKGROUND: Docetaxel based therapy is one of the first line chemotherapeutic agents for the treatment of metastatic castrate-resistant prostate cancer. However, one of the major obstacles in the treatment of these patients is docetaxel-resistance. Defining the mechanisms of resistance so as to inform subsequent treatment options and combinations represents a challenge for clinicians and scientists. Previous work by our group has shown complex changes in pro and anti-apoptotic proteins in the development of resistance to docetaxel...
March 1, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28246289/hepatic-activation-of-the-fam3c-hsf1-cam-pathway-attenuates-hyperglycemia-of-obese-diabetic-mice
#3
Zhenzhen Chen, Liwei Ding, Weili Yang, Junpei Wang, Liming Chen, Yongsheng Chang, Bin Geng, Qinghua Cui, Youfei Guan, Jichun Yang
FAM3C is a member of family with sequence similarity 3 (FAM3) gene family, and this study determined its role and mechanism in regulation of hepatic glucose/lipid metabolism. In obese diabetic mice, FAM3C expression was reduced in the liver, and hepatic FAM3C restoration improved insulin resistance, hyperglycemia and fatty liver. FAM3C overexpression increased the expression of heat shock factor 1 (HSF1), calmodulin (CaM) and phosphorylated Akt (pAkt), and reduced that of gluconeogenic and lipogenic genes in diabetic mouse livers with the suppression of gluconeogenesis and lipid deposition...
February 28, 2017: Diabetes
https://www.readbyqxmd.com/read/28241425/heat-shock-factor-1-depletion-sensitizes-a172-glioblastoma-cells-to-temozolomide-via-suppression-of-cancer-stem-cell-like-properties
#4
Chang-Nim Im, Hye Hyeon Yun, Jeong-Hwa Lee
Heat shock factor 1 (HSF1), a transcription factor activated by various stressors, regulates proliferation and apoptosis by inducing expression of target genes, such as heat shock proteins and Bcl-2 (B-cell lymphoma 2) interacting cell death suppressor (BIS). HSF1 also directly interacts with BIS, although it is still unclear whether this interaction is critical in the regulation of glioblastoma stem cells (GSCs). In this study, we examined whether small interfering RNA-mediated BIS knockdown decreased protein levels of HSF1 and subsequent nuclear localization under GSC-like sphere (SP)-forming conditions...
February 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28202124/-effect-of-heat-shock-factor-1-on-airway-hyperresponsiveness-and-airway-inflammation-in-mice-with-allergic-asthma
#5
Jing Wang, Li-Hong Xin, Wei Cheng, Zhen Wang, Wen Zhang
OBJECTIVE: To investigate the effect of heat shock factor 1 (HSF1) on airway hyperresponsiveness and airway inflammation in mice with asthma and possible mechanisms. METHODS: A total of 36 mice were randomly divided into four groups: control, asthma, HSF1 small interfering RNA negative control (siHSF1-NC), and siHSF1 intervention (n=9 each). Ovalbumin (OVA) sensitization and challenge were performed to induce asthma in the latter three groups. The mice in the siHSF1-NC and siHSF1 groups were treated with siHSF1-NC and siHSF1, respectively...
February 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28194040/abnormal-degradation-of-the-neuronal-stress-protective-transcription-factor-hsf1-in-huntington-s-disease
#6
Rocio Gomez-Pastor, Eileen T Burchfiel, Daniel W Neef, Alex M Jaeger, Elisa Cabiscol, Spencer U McKinstry, Argenia Doss, Alejandro Aballay, Donald C Lo, Sergey S Akimov, Christopher A Ross, Cagla Eroglu, Dennis J Thiele
Huntington's Disease (HD) is a neurodegenerative disease caused by poly-glutamine expansion in the Htt protein, resulting in Htt misfolding and cell death. Expression of the cellular protein folding and pro-survival machinery by heat shock transcription factor 1 (HSF1) ameliorates biochemical and neurobiological defects caused by protein misfolding. We report that HSF1 is degraded in cells and mice expressing mutant Htt, in medium spiny neurons derived from human HD iPSCs and in brain samples from patients with HD...
February 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28192256/response-of-gut-health-and-microbiota-to-sulfide-exposure-in-pacific-white-shrimp-litopenaeus-vannamei
#7
Yantong Suo, Erchao Li, Tongyu Li, Yongyi Jia, Jian G Qin, Zhimin Gu, Liqiao Chen
Sulfide is a natural and widely distributed toxicant. It can be commonly found on the interface between water and sediment in the aquatic environment. The Pacific white shrimp Litopenaeus vannamei starts life in the benthic zone soon after the mysis stage, an early stage of post larvae. Therefore, L. vannamei is inevitably affected by exposure to sulfide released from pond sediment. This study explored the toxicant effect of different concentrations of sulfide on the intestinal health and microbiota of Pacific white shrimp by monitoring the change of expression of inflammatory, immune related cytokines, and the structure of the intestinal microbiota...
February 10, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28183718/the-heat-shock-factor-hsf1-juggles-protein-quality-control-and-metabolic-regulation
#8
Carles Cantó
Transcriptional regulators often act as central hubs to integrate multiple nutrient and stress signals. In this issue, Qiao et al. (2017. J. Cell Biol. https://doi.org/10.1083/jcb.201607091) demonstrate how heat shock factor 1 (HSF1) uncouples metabolic control from proteostatic regulation and unveils HSF1 as a critical transcriptional regulator of NAD(+) metabolism.
March 6, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28183717/the-transcriptional-regulator-of-the-chaperone-response-hsf1-controls-hepatic-bioenergetics-and-protein-homeostasis
#9
Aijun Qiao, Xiongjie Jin, Junfeng Pang, Demetrius Moskophidis, Nahid F Mivechi
Metabolic energy reprogramming facilitates adaptations to a variety of stress conditions and cellular dysfunction, but how the energetic demands are monitored and met in response to physiological stimuli remains elusive. Our data support a model demonstrating that heat shock factor 1 (HSF1), a master transcriptional regulator of the chaperone response, has been coopted from its role as a critical protein quality-control regulator to having a central role in systemic energy sensing and for metabolic adaptation to nutrient availability...
March 6, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28159978/protection-of-glial-m%C3%A3-ller-cells-by-dexamethasone-in-a-mouse-model-of-surgically-induced-blood-retinal-barrier-breakdown
#10
Lourdes Siqueiros-Marquez, Romain Bénard, Ophélie Vacca, Hugo Charles-Messance, Rodrigo Bolaños-Jimenez, Xavier Guilloneau, Florian Sennlaub, Cecilia Montañez, José Alain Sahel, Alvaro Rendon, Ramin Tadayoni, Audrey Giocanti-Aurégan
Purpose: Breakdown of the inner blood-retinal barrier (iBRB) occurs in many retinal disorders and may cause retinal edema often responsible for vision loss. Dexamethasone is used in clinical practice to restore iBRB. The aim of this study was to characterize the impact of a surgically induced iBRB breakdown on retinal homeostatic changes due to dystrophin Dp71, aquaporin-4 (AQP4), and Kir4.1 alterations in Müller glial cells (MGC) in a mouse model. The protective effect of dexamethasone was assessed in this model...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28128329/oridonin-triggers-chaperon-mediated-proteasomal-degradation-of-bcr-abl-in-leukemia
#11
Huilin Huang, Hengyou Weng, Bowen Dong, Panpan Zhao, Hui Zhou, Lianghu Qu
Inducing degradation of oncoproteins by small molecule compounds has the potential to avoid drug resistance and therefore deserves to be exploited for new therapies. Oridonin is a natural compound with promising antitumor efficacy that can trigger the degradation of oncoproteins; however, the direct cellular targets and underlying mechanisms remain unclear. Here we report that oridonin depletes BCR-ABL through chaperon-mediated proteasomal degradation in leukemia. Mechanistically, oridonin poses oxidative stress in cancer cells and directly binds to cysteines of HSF1, leading to the activation of this master regulator of the chaperone system...
January 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28115653/cadmium-mediated-activation-of-the-hsp90-hsf1-pathway-regulated-by-reactive-persulfides-polysulfides
#12
Yasuhiro Shinkai, Akira Masuda, Masahiro Akiyama, Ming Xian, Yoshito Kumagai
Cadmium is an environmental electrophile that modifies reactive thiols in proteins, indicating that this heavy metal may modulate redox-signal transduction pathways. The current consensus is that reactive persulfides and polysulfides produced by cystathionine γ-lyase (CSE) and cystathionine β-synthase are highly nucleophilic and thus cadmium may be captured by these reactive sulfur species. It has previously been found that electrophile-mediated covalent modifications of the heat shock protein (HSP) are involved in the activation of heat shock factor 1 (HSF1) pathway...
January 23, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28104499/methylene-blue-increases-the-amount-of-hsf1-through-promotion-of-pka-mediated-increase-in-hsf1-p300-interaction
#13
Chao Huang, Wenfeng Hu, Jili Wang, Lijuan Tong, Xu Lu, Feng Wu, Yong Ling, Bo Jiang, Wei Zhang, Zhuo Chen, Qiuju Xiong, Yibin Qin, Rongrong Yang
Heat shock factor 1 (HSF1) critically contributes to the host defense, and its amount determines the mobilization efficiency of HSF1 under stress conditions. To date, how HSF1 amount is regulated remains largely unknown. We found that methylene blue (MB), an anti-oxidative and anti-inflammatory agent, increased the amount of HSF1 in BV-2 microglia, primary microglia, astrocytes, neurons and vital organs. The increased HSF1 contributed to a more increase in nuclear translocation of HSF1, association of HSF1 with heat shock protein 70 (Hsp70) promoters and Hsp70 expression levels, and also induced a synergistic protection against oxidative stress-induced injuries in MB and heat shock-treated cells...
January 16, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28096332/human-nf-%C3%AE%C2%BAb-repressing-factor-acts-as-a-stress-regulated-switch-for-ribosomal-rna-processing-and-nucleolar-homeostasis-surveillance
#14
Marta Coccia, Antonio Rossi, Anna Riccio, Edoardo Trotta, Maria Gabriella Santoro
The nucleolus, a dynamic nuclear compartment long regarded as the cell ribosome factory, is emerging as an important player in the regulation of cell survival and recovery from stress. In larger eukaryotes, the stress-induced transcriptional response is mediated by a family of heat-shock transcription factors. Among these, HSF1, considered the master regulator of stress-induced transcriptional responses, controls the expression of cytoprotective heat shock proteins (HSPs), molecular chaperones/cochaperones constituting a major component of the cell protein quality control machinery essential to circumvent stress-induced degradation and aggregation of misfolded proteins...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28091697/heat-shock-transcription-factor-1-protects-against-pressure-overload-induced-cardiac-fibrosis-via-smad3
#15
Ning Zhou, Yong Ye, Xingxu Wang, Ben Ma, Jian Wu, Lei Li, Lin Wang, Dao Wen Wang, Yunzeng Zou
Fibrotic cardiac muscle exhibits high stiffness and low compliance which are major risk factors of heart failure. Although heat shock transcription factor 1 (HSF1) was identified as an intrinsic cardioprotective factor, the role that HSF1 plays in cardiac fibrosis remains unclear. Our study aims to investigate the role of HSF1 in pressure overload-induced cardiac fibrosis and the underlying mechanism. HSF1 phosphorylation was significantly downregulated in transverse aortic constriction (TAC)-treated mouse hearts and mechanically stretched cardiac fibroblasts (cFBs)...
January 13, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/28089856/erythrocyte-heat-shock-protein-responses-to-chronic-in-vivo-and-acute-in-vitro-temperature-challenge-in-diploid-and-triploid-salmonids
#16
Pillai V Saranyan, Neil W Ross, Tillmann J Benfey
This research investigated how ploidy level (diploid versus triploid) affects the heat shock protein (HSP) response in erythrocytes under different thermal stress regimes, both in vivo and in vitro, in Atlantic salmon (Salmo salar) and brook charr (Salvelinus fontinalis) in order to address the question of why triploids typically have reduced thermal tolerance. A preliminary study confirmed that identical volumes of diploid and triploid erythrocytes (which equates to a smaller number of larger cells for triploids compared to diploids) did not differ in total protein synthesis rates...
January 13, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28052564/regulation-of-the-mammalian-heat-shock-factor-1
#17
REVIEW
Sharadha Dayalan Naidu, Albena T Dinkova-Kostova
Living organisms are endowed with the capability to tackle various forms of cellular stress due to the presence of molecular chaperone machinery complexes that are ubiquitous throughout the cell. During conditions of proteotoxic stress, the transcription factor heat shock factor 1 (HSF1) mediates the elevation of heat shock proteins, which are crucial components of the chaperone complex machinery and function to ameliorate protein misfolding and aggregation and restore protein homeostasis. In addition, HSF1 orchestrates a versatile transcriptional programme that includes genes involved in repair and clearance of damaged macromolecules and maintenance of cell structure and metabolism, and provides protection against a broad range of cellular stress mediators, beyond heat shock...
January 4, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28049024/1-4-naphthoquinone-activates-the-hsp90-hsf1-pathway-through-the-s-arylation-of-hsp90-in-a431-cells-negative-regulation-of-the-redox-signal-transduction-pathway-by-persulfides-polysulfides
#18
Yumi Abiko, Liang Sha, Yasuhiro Shinkai, Takamitsu Unoki, Nho Cong Luong, Yukihiro Tsuchiya, Yasuo Watanabe, Reiko Hirose, Takaaki Akaike, Yoshito Kumagai
The current consensus is that environmental electrophiles activate redox signal transduction pathways through covalent modification of sensor proteins with reactive thiol groups at low concentrations, while they cause cell damage at higher concentrations. We previously exposed human carcinoma A431 cells to the atmospheric electrophile 1,4-naphthoquinone (1,4-NQ) and found that heat shock protein 90 (HSP90), a negative regulator of heat shock factor 1 (HSF1), was a target of 1,4-NQ. In the study presented here, we determined whether 1,4-NQ activates HSF1...
March 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28031489/unrestrained-ampylation-targets-cytosolic-chaperones-and-activates-the-heat-shock-response
#19
Matthias C Truttmann, Xu Zheng, Leo Hanke, Jadyn R Damon, Monique Grootveld, Joanna Krakowiak, David Pincus, Hidde L Ploegh
Protein AMPylation is a conserved posttranslational modification with emerging roles in endoplasmic reticulum homeostasis. However, the range of substrates and cell biological consequences of AMPylation remain poorly defined. We expressed human and Caenorhabditis elegans AMPylation enzymes-huntingtin yeast-interacting protein E (HYPE) and filamentation-induced by cyclic AMP (FIC)-1, respectively-in Saccharomyces cerevisiae, a eukaryote that lacks endogenous protein AMPylation. Expression of HYPE and FIC-1 in yeast induced a strong cytoplasmic Hsf1-mediated heat shock response, accompanied by attenuation of protein translation, massive protein aggregation, growth arrest, and lethality...
January 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28009259/principles-of-systems-biology-no-12
#20
(no author information available yet)
This month: Plants take center stage with fascinating insights into disease susceptibility and engineered pathways for photosynthesis. Also, a wearable stethoscope, new noncanonical miRNA targeting rules, Hsf1, and transcription.
December 21, 2016: Cell Systems
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