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https://www.readbyqxmd.com/read/29785454/the-roles-of-arabidopsis-hsfa2-hsfa4a-and-hsfa7a-in-the-heat-shock-response-and-cytosolic-protein-response
#1
Kuan-Fu Lin, Meng-Yu Tsai, Chung-An Lu, Shaw-Jye Wu, Ching-Hui Yeh
Previously, we found that Arabidopsis plants transformed with a construct containing the promoter of Oshsp17.3 from rice fused to the β-glucuronidase gene (GUS), Oshsp17.3Pro::GUS (Oshsp17.3p), showed a GUS signal after heat shock (HS) or azetidine-2-carboxylic acid (AZC) treatment. HS and AZC trigger the heat shock response (HSR) and cytosolic protein response (CPR), respectively, in the cytosol by modulating specific heat shock factor (HSF) activity. Here we further identified that AtHSFA2 (At2g26150), AtHSFA7a (At3g51910), AtHSFB2a (At5g62020), and AtHSFB2b (At4g11660) are HS- and AZC-inducible; AtHSFA4a (At4g18880) is AZC-inducible; and AtHSFA5 (At4g13980) is less AZC- and HS-inducible...
May 21, 2018: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/29784903/exercise-ameliorates-endoplasmic-reticulum-stress-mediated-vascular-dysfunction-in-mesenteric-arteries-in-atherosclerosis
#2
Junyoung Hong, Kwangchan Kim, Eunkyung Park, Jonghae Lee, Melissa M Markofski, Sean P Marrelli, Yoonjung Park
Endoplasmic reticulum (ER) stress is closely associated with atherosclerosis, but the effects of exercise on ER stress-mediated endothelial dysfunction in atherosclerosis is not yet fully understood. We assessed endothelium-dependent vasodilation in isolated mesenteric arteries from wild type (WT), WT with exercise (WT-EX), ApoE knockout (ApoE KO), and ApoE KO mice with exercise (ApoE KO-EX). Vasodilation to acetylcholine (ACh) was elicited in the presence of inhibitors of ER stress, eNOS, caspase-1, and UCP-2 (Tudca, L-NAME, AC-YVARD-cmk, and Genipin, respectively) and the ER stress inducer (Tunicamycin)...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29778697/structural-basis-for-selective-inhibition-of-antibacterial-target-mray-a-membrane-bound-enzyme-involved-in-peptidoglycan-synthesis
#3
REVIEW
Jenny Hering, Elin Dunevall, Margareta Ek, Gisela Brändén
The rapid growth of antibiotic-resistant bacterial infections is of major concern for human health. Therefore, it is of great importance to characterize novel targets for the development of antibacterial drugs. One promising protein target is MraY (UDP-N-acetylmuramyl-pentapeptide: undecaprenyl phosphate N-acetylmuramyl-pentapeptide-1-phosphate transferase or MurNAc-1-P-transferase), which is essential for bacterial cell wall synthesis. Here, we summarize recent breakthroughs in structural studies of bacterial MraYs and the closely related human GPT (UDP-N-acetylglucosamine: dolichyl phosphate N-acetylglucosamine-1-phosphate transferase or GlcNAc-1-P-transferase)...
May 17, 2018: Drug Discovery Today
https://www.readbyqxmd.com/read/29777791/ticagrelor-protects-against-angii-induced-endothelial-dysfunction-by-alleviating-endoplasmic-reticulum-stress
#4
Xiaoyu Wang, Xuejie Han, Minghui Li, Yu Han, Yun Zhang, Shiqi Zhao, Yue Li
Ticagrelor has been reported to decrease cardiovascular mortality compared with clopidogrel. This benefit cannot be fully explained by the more efficient platelet inhibition. Many studies demonstrated that ticagrelor improved endothelial function, leaving the mechanism elusive though. The present study aims to investigate whether ticagrelor protects against endothelial dysfunction induced by angiotensinII (AngII) through alleviating endoplasmic reticulum (ER) stress. Male Sprague Dawley rats were infused with AngII or vehicle and administrated with ticagrelor or vehicle for 14 days...
May 16, 2018: Microvascular Research
https://www.readbyqxmd.com/read/29767952/laser-cleavable-probes-based-cell-surface-engineering-for-in-situ-sialoglycoconjugates-profiling-by-ldi-mass-spectrometry
#5
Jie Sun, Huihui Liu, Lingpeng Zhan, Caiqiao Xiong, Xi Huang, Jinjuan Xue, Zongxiu Nie
Cell-surface sialoglycoconjugates (sialoglycoproteins & sialoglycolipids) play important roles in cell-cell interactions and related tumor metastasis process. Although there have been some analytical methods to evaluate the sialoglycoconjugates, an effective method providing both qualitative and quantitative information is still deficient. Here we establish an extraction-free, sensitive and high-throughput platform to realize in-situ detection of the cell-surface sialoglycoconjugates on various cell lines, e...
May 16, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29764928/ovarian-steroid-dependence-of-endoplasmic-reticulum-stress-involvement-in-endometrial-cell-apoptosis-during-the-human-endometrial-cycle
#6
Jong Yeob Choi, Min Wha Jo, Eun Young Lee, Dong-Yun Lee, Doo Seok Choi
Endoplasmic reticulum (ER) stress is a common cellular stress response that enhances apoptosis to trigger cell death. However, recent studies have shown that estrogen suppresses apoptosis by inhibiting ER stress in some cell types, suggesting that ER stress-induced apoptosis is regulated by ovarian steroid hormones. In endometrial cells, ER stress may also be controlled by ovarian steroid hormones and could be involved in apoptosis induction during the menstrual cycle. To test this hypothesis, we elucidate whether ER stress is regulated by ovarian steroid hormones in human endometrial cells and if it is involved in apoptosis induction...
June 2018: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/29763880/anti-neuroinflammatory-effects-of-20c-from-gastrodia-elata-via-regulating-autophagy-in-lps-activated-bv-2-cells-through-mapks-and-tlr4-akt-mtor-signaling-pathways
#7
Qian-Hang Shao, Xiao-Ling Zhang, Ying Chen, Cheng-Gen Zhu, Jian-Gong Shi, Yu-He Yuan, Nai-Hong Chen
20C, a novel bibenzyl compound, is isolated from Gastrodia elata. In our previous study, 20C showed protective effects on tunicamycin-induced endoplasmic reticulum stress, rotenone-induced apoptosis and rotenone-induced oxidative damage. However, the anti-neuroinflammatory effect of 20C is still with limited acquaintance. The objective of this study was to confirm the anti-neuroinflammatory effect of 20C on Lipopolysaccharide (LPS)-activated BV-2 cells and further elucidated the underlying molecular mechanisms...
May 12, 2018: Molecular Immunology
https://www.readbyqxmd.com/read/29758225/trpv6-protects-er-stress-induced-apoptosis-via-atf6%C3%AE-trpv6-jnk-pathway-in-human-embryonic-stem-cell-derived-cardiomyocytes
#8
Zhichao Li, Zhaoyue Meng, Jun Lu, Francis M Chen, Wing-Tak Wong, Gary Tse, Changbo Zheng, Wendy Keung, Kennis Tse, Ronald A Li, Liwen Jiang, Xiaoqiang Yao
Human pluripotent stem cell-derived cardiomyocytes have potential applications in disease modeling and drug screening. Therefore, it is important to understand the mechanisms and signaling pathways underlying the survival and death of these cells. Endoplasmic reticulum (ER) stress is triggered by various cellular stresses that disturb protein folding in the ER. Cells cope with ER stress by activating the unfolded protein response (UPR), a homeostatic signaling network that orchestrates the recovery of ER function...
May 11, 2018: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29755357/-n-glycosylation-of-lipocalin-2-is-not-required-for-secretion-or-exosome-targeting
#9
Erawan Borkham-Kamphorst, Eddy Van de Leur, Steffen K Meurer, Eva M Buhl, Ralf Weiskirchen
Lipocalin 2 (LCN2) is a highly conserved secreted adipokine acting as a serum transport protein for small hydrophobic molecules such as fatty acids and steroids. In addition, LCN2 limits bacterial growth by sequestering iron-containing siderophores and further protects against intestinal inflammation and tumorigenesis associated with alterations in the microbiota. Human LCN2 contains one N -glycosylation site conserved in other species. It was postulated that this post-translational modification could facilitate protein folding, protects from proteolysis, is required for proper trafficking from the Golgi apparatus to the cell surface, and might be relevant for effective secretion...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29744053/endoplasmic-reticulum-stress-induced-apoptosis-in-intestinal-epithelial-cells-a-feed-back-regulation-by-mechanistic-target-of-rapamycin-complex-1-mtorc1
#10
Yun Ji, Xuan Luo, Ying Yang, Zhaolai Dai, Guoyao Wu, Zhenlong Wu
Background: Endoplasmic reticulum (ER) stress is associated with multiple pathological processes of intestinal diseases. Despite a critical role of mechanistic target of rapamycin complex 1 (mTORC1) in regulating cellular stress response, the crosstalk between mTORC1 and ER stress signaling and its contribution to the intestinal barrier function is unknown. Results: In the present study, we showed that intestinal epithelial cells (IEC-6) incubated with tunicamycin led to caspase-3-dependent apoptotic cell death...
2018: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/29728739/decreased-contraction-induced-by-endothelium-derived-contracting-factor-in-prolonged-treatment-of-rat-renal-artery-with-endoplasmic-reticulum-stress-inducer
#11
Makoto Ando, Takayuki Matsumoto, Kumiko Taguchi, Tsuneo Kobayashi
Recent evidence suggests that endoplasmic reticulum (ER) stress is involved in the regulation of various physiological functions, including those of the vascular system. However, the relationship between ER stress and vascular function is poorly understood. The endothelial cells control the vascular tone by releasing endothelium-derived relaxing factors and contracting factors (EDCFs). We hypothesized that tunicamycin, an inducer of ER stress, modifies endothelium-dependent contraction and prostaglandins (PGs), a major class of EDCFs, induced contractions in the rat renal artery in rats...
May 4, 2018: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29728390/unprotonated-short-chain-alkylamines-inhibit-staphylolytic-activity-of-lysostaphin-in-a-wall-teichoic-acid-dependent-manner
#12
Xia Wu, Seok Joon Kwon, Domyoung Kim, Jian Zha, Mauricio Mora-Pale, Jonathan S Dordick
Lysostaphin (Lst) is a potent bacteriolytic enzyme that kills Staphylococcus aureus , a common bacterial pathogen of humans and animals. With high activity against both planktonic cells and biofilms, Lst has the potential to be used in industrial products, such as commercial cleansers, for decontamination. However, Lst is inhibited in the presence of monoethanolamine (MEA), a chemical widely used in cleaning solutions and pharmaceuticals, and the underlying mechanism remains unknown. In this study, we examined the cell binding and killing capabilities of Lst against S...
May 4, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29717117/n-glycosylation-of-mouse-trail-r-restrains-trail-induced-apoptosis
#13
Yann Estornes, Yves Dondelinger, Kathrin Weber, Inge Bruggeman, Adam Peall, Marion MacFarlane, Serge Lebecque, Peter Vandenabeele, Mathieu J M Bertrand
The sensitivity of cells to death receptor-induced apoptosis is commonly controlled by multiple checkpoints in order to limit induction of excessive or unnecessary death. Although cytotoxic in various cancer cells, tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) does not trigger apoptosis in most non-transformed cells. The molecular nature of the checkpoints that normally protect the cells from TRAIL-induced death are not fully understood. Endoplasmic reticulum (ER) stress has been reported to switch the sensitivity of human cells to the cytotoxic effect of TRAIL, suggesting that this cellular state perturbs some of these protective mechanisms...
May 2, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29713521/new-experimental-models-of-retinal-degeneration-for-screening-molecular-photochromic-ion-channel-blockers
#14
A Yu Rotov, L A Astakhova, V S Sitnikova, A A Evdokimov, V M Boitsov, M V Dubina, M N Ryazantsev, M L Firsov
Application of molecular photochromic ion channel blockers to recover the visual function of a degenerated retina is one of the promising trends in photopharmacology. To this day, several photochromic azobenzene-based compounds have been proposed and their functionality has been demonstrated on cell lines and knockout mouse models. Further advance necessitates testing of the physiological activity of a great number of new compounds. The goal of this study is to propose animal models of photoreceptor degeneration that are easier to obtain than knockout mouse models but include the main features required for testing the physiological activity of molecular photoswitches...
January 2018: Acta Naturae
https://www.readbyqxmd.com/read/29707686/analysis-of-endoplasmic-reticulum-er-stress-induced-during-somatic-cell-nuclear-transfer-scnt-process-in-porcine-scnt-embryos
#15
Hwa-Yeon Lee, Hyo-Kyung Bae, Bae-Dong Jung, Seunghyung Lee, Choon-Keun Park, Boo-Keun Yang, Hee-Tae Cheong
This study investigates the endoplasmic reticulum (ER) stress and subsequent apoptosis in duced during somatic cell nuclear transfer (SCNT) process of porcine SCNT embryos. Porcine SCNT and in vitro fertilization (IVF) embryos were sampled at 3 h and 20 h after SCNT or IVF and at the blastocyst stage for mRNA extraction. The x-box binding protein 1 (Xbp1) mRNA and the expressions of ER stress-associated genes were confirmed by RT-PCR or RT-qPCR. Apoptotic gene expression was analyzed by RT-PCR. Before commencing SCNT, somatic cells treated with tunicamycin (TM), an ER stress inducer, confirmed the splicing of Xbp1 mRNA and increased expressions of ER stress-associated genes...
March 2018: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/29705800/histone-deacetylases-promote-er-stress-induced-epithelial-mesenchymal-transition-in-human-lung-epithelial-cells
#16
Daishun Liu, Honglan Zhu, Ling Gong, Shenglan Pu, Yang Wu, Wei Zhang, Guichuan Huang
BACKGROUND/AIMS: Epithelial to mesenchymal transition (EMT) is a crucial process involved in pulmonary fibrosis. This study aimed to explore the role of histone deacetylases (HDACs) and endoplasmic reticulum (ER) stress in EMT in human lung epithelial cells. METHODS: Human lung adenocarcinoma A549 cells were treated with bleomycin and tunicamycin to induce EMT. The proliferation of A549 cells was detected by MTT assay. The expression of HDACs and EMT markers was detected by PCR and Western blot analysis...
April 25, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29688606/constitutive-bip-protein-accumulation-in-arabidopsis-mutants-defective-in-a-gene-encoding-chloroplast-resident-stearoyl-acyl-carrier-protein-desaturase
#17
Yuji Iwata, Tsukasa Iida, Toshihiro Matsunami, Yu Yamada, Kei-Ichiro Mishiba, Takumi Ogawa, Tetsuya Kurata, Nozomu Koizumi
The unfolded protein response (UPR) occurs when protein folding and maturation are disturbed in the endoplasmic reticulum (ER). During the UPR, a number of genes including those encoding ER-resident molecular chaperones are induced. In Arabidopsis, BiP3 has been used as a UPR marker gene whose expression is strongly induced in response to ER stress. In this study, we mutagenized Arabidopsis plants expressing β-glucuronidase (GUS) gene under the control of BiP3 promoter and isolated a mutant that exhibits strong GUS activity without treatment with ER stress inducers...
April 24, 2018: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
https://www.readbyqxmd.com/read/29684334/the-mkk7-inhibitor-peptide-gadd45%C3%AE-i-attenuates-er-stress-induced-mitochondrial-dysfunction-in-ht22-cells-involvement-of-jnk-wnt-pathway
#18
Guang-Hua Xu, Bing-Jun Song, Dan Liu, Yu-Hua Chen, Yuan Zhou, Wen-Bo Liu, Hua Li, Tian-Lin Long, Rui Zhang, Wei Liu
JNK, a member of the mitogen activated protein kinases (MAPKs) superfamily, plays a key role in cell death in many neurological disorders, but systemic inhibition of JNK has detrimental side effects. JNK can be regulated by two direct upstream kinases: MAPK kinase 4 (MKK4) and MAPK kinase 7 (MKK7). Here, we investigated the effect of GADD45β-I, a recently designed cell-permeable inhibitor peptide for MKK7, on endoplasmic reticulum (ER) stress-induced cytotoxicity in neuronal HT22 cells. We found that treatment with the ER stress inducer tunicamycin (TM) increased the phosphorylation of JNK and MKK7 in HT22 cells, which was nullified by GADD45β-I...
April 20, 2018: Brain Research
https://www.readbyqxmd.com/read/29676583/reticulocalbin-3-deficiency-in-alveolar-epithelium-exacerbated-bleomycin-induced-pulmonary-fibrosis
#19
Jiawei Jin, Xiaoqian Shi, Yongchao Li, Qianyu Zhang, Yu Guo, Chaokun Li, Pingping Tan, Qiuhong Fang, Yingmin Ma, Runlin Z Ma
Reticulocalbin 3 (Rcn3) is an endoplasmic reticulum (ER) lumen protein localized to the secretory pathway. We have reported that Rcn3 plays critical role for alveolar epithelial cell type II (AECII) maturation during perinatal lung development, but its biological role in the adult lung is largely unknown. Herein, we found marked induction of Rcn3 expression in alveolar epithelium during bleomycin-induced pulmonary fibrosis, which is most obvious in AECIIs. To further examine Rcn3 in pulmonary injury-remodeling, we generated transgenic mice to selectively delete Rcn3 in AECIIs in adulthood...
April 20, 2018: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/29675957/endoplasmic-reticulum-stress-induces-spatial-memory-deficits-by-activating-gsk-3
#20
Li Lin, Jie Cao, Shu-Sheng Yang, Zheng-Qi Fu, Peng Zeng, Jiang Chu, Lin-Na Ning, Teng Zhang, Yan Shi, Qing Tian, Xin-Wen Zhou, Jian-Zhi Wang
Endoplasmic reticulum (ER) stress is involved in Alzheimer's disease (AD), but the mechanism is not fully understood. Here, we injected tunicamycin (TM), a recognized ER stress inducer, into the brain ventricle of Sprague-Dawley (SD) rats to induce the unfolded protein response (UPR), demonstrated by the enhanced phosphorylation of pancreatic ER kinase (PERK), inositol-requiring enzyme-1 (IRE-1) and activating transcription factor-6 (ATF-6). We observed that UPR induced spatial memory deficits and impairments of synaptic plasticity in the rats...
April 19, 2018: Journal of Cellular and Molecular Medicine
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