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endoplasmic reticulum stress

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https://www.readbyqxmd.com/read/28107238/roles-of-the-endoplasmic-reticulum-stress-transducer-oasis-in-ossification-of-the-posterior-longitudinal-ligament
#1
Yu Chen, Haisong Yang, Jinhao Miao, Xiaowei Liu, Xinwei Wang, Deyu Chen
STUDY DESIGN: In vitro molecular research on the posterior longitudinal ligament fibroblasts. OBJECTIVE: To investigate different expression of old astrocyte specifically induced substance (OASIS) between spinal ligament fibroblasts from the patients with ossification of the posterior longitudinal ligament (OPLL) and from non-OPLL patients and demonstrate knockdown of OASIS protein expression by RNA interference inhibiting expression of type I collagen (COL I) in OPLL cells...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28106827/neuroprotective-strategy-in-retinal-degeneration-suppressing-er-stress-induced-cell-death-via-inhibition-of-the-mtor-signal
#2
REVIEW
Bin Fan, Ying-Jian Sun, Shu-Yan Liu, Lin Che, Guang-Yu Li
The retina is a specialized sensory organ, which is essential for light detection and visual formation in the human eye. Inherited retinal degenerations are a heterogeneous group of eye diseases that can eventually cause permanent vision loss. UPR (unfolded protein response) and ER (endoplasmic reticulum) stress plays an important role in the pathological mechanism of retinal degenerative diseases. mTOR (the mammalian target of rapamycin) kinase, as a signaling hub, controls many cellular processes, covering protein synthesis, RNA translation, ER stress, and apoptosis...
January 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28106766/the-anti-oxidant-defense-system-of-the-marine-polar-ciliate-euplotes-nobilii-characterization-of-the-msrb-gene-family
#3
Francesca Ricci, Federico M Lauro, Joseph J Grzymski, Robert Read, Rigers Bakiu, Gianfranco Santovito, Pierangelo Luporini, Adriana Vallesi
Organisms living in polar waters must cope with an extremely stressful environment dominated by freezing temperatures, high oxygen concentrations and UV radiation. To shed light on the genetic mechanisms on which the polar marine ciliate, Euplotes nobilii, relies to effectively cope with the oxidative stress, attention was focused on methionine sulfoxide reductases which repair proteins with oxidized methionines. A family of four structurally distinct MsrB genes, encoding enzymes specific for the reduction of the methionine-sulfoxide R-forms, were identified from a draft of the E...
January 18, 2017: Biology
https://www.readbyqxmd.com/read/28106734/glycative-stress-and-its-defense-machinery-glyoxalase-1-in-renal-pathogenesis
#4
REVIEW
Yosuke Hirakawa, Reiko Inagi
Chronic kidney disease is a major public health problem around the world. Because the kidney plays a role in reducing glycative stress, renal dysfunction results in increased glycative stress. In turn, glycative stress, especially that due to advanced glycated end products (AGEs) and their precursors such as reactive carbonyl compounds, exacerbates chronic kidney disease and is related to premature aging in chronic kidney disease, whether caused by diabetes mellitus or otherwise. Factors which hinder a sufficient reduction in glycative stress include the inhibition of anti-glycation enzymes (e...
January 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28106121/endoplasmic-reticulum-oxidative-stress-triggers-tgf-beta-dependent-muscle-dysfunction-by-accelerating-ascorbic-acid-turnover
#5
Diego Pozzer, Mariagrazia Favellato, Marco Bolis, Roberto William Invernizzi, Francesca Solagna, Bert Blaauw, Ester Zito
Endoplasmic reticulum (ER) and oxidative stress are two related phenomena that have important metabolic consequences. As many skeletal muscle diseases are triggered by oxidative stress, we explored the chain of events linking a hyperoxidized ER (which causes ER and oxidative stress) with skeletal muscle dysfunction. An unbiased exon expression array showed that the combined genetic modulation of the two master ER redox proteins, selenoprotein N (SEPN1) and endoplasmic oxidoreductin 1 (ERO1), led to an SEPN1-related myopathic phenotype due to excessive signalling of transforming growth factor (TGF)-beta...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105938/the-influence-of-pro-longevity-gene-gclc-overexpression-on-the-age-dependent-changes-in-drosophila-transcriptome-and-biological-functions
#6
Alexey Moskalev, Mikhail Shaposhnikov, Ekaterina Proshkina, Alexey Belyi, Alexander Fedintsev, Svetlana Zhikrivetskaya, Zulfiya Guvatova, Asiya Sadritdinova, Anastasia Snezhkina, George Krasnov, Anna Kudryavtseva
BACKGROUND: Transcriptional changes that contribute to the organism's longevity and prevent the age-dependent decline of biological functions are not well understood. Here, we overexpressed pro-longevity gene encoding glutamate-cysteine ligase catalytic subunit (Gclc) and analyzed age-dependent changes in transcriptome that associated with the longevity, stress resistance, locomotor activity, circadian rhythmicity, and fertility. RESULTS: Here we reproduced the life extension effect of neuronal overexpression of the Gclc gene and investigated its influence on the age-depended dynamics of transcriptome and biological functions such as fecundity, spontaneous locomotor activity and circadian rhythmicity, as well as on the resistance to oxidative, proteotoxic and osmotic stresses...
December 28, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28105371/unfolding-anti-tumor-immunity-er-stress-responses-sculpt-tolerogenic-myeloid-cells-in-cancer
#7
REVIEW
Juan R Cubillos-Ruiz, Eslam Mohamed, Paulo C Rodriguez
Established tumors build a stressful and hostile microenvironment that blocks the development of protective innate and adaptive immune responses. Different subsets of immunoregulatory myeloid populations, including dendritic cells, myeloid-derived suppressor cells (MDSCs) and macrophages, accumulate in the stressed tumor milieu and represent a major impediment to the success of various forms of cancer immunotherapy. Specific conditions and factors within tumor masses, including hypoxia, nutrient starvation, low pH, and increased levels of free radicals, provoke a state of "endoplasmic reticulum (ER) stress" in both malignant cells and infiltrating myeloid cells...
2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28104585/rcad-bip-pathway-is-necessary-for-the-proper-synthesis-of-digestive-enzymes-and-the-secretory-function-of-the-exocrine-pancreas
#8
Camille Miller, Yafei Cai, Tadd Patton, Sarai Graves, Honglin Li, Maria Eugenia Sabbatini
Alcoholism causes an imbalance of endoplasmic reticulum (ER) homeostasis in pancreatic acini. In those cells, the ER is involved in the synthesis and folding of pancreatic enzymes. Ufm1 (Ubiquitin-fold modifier 1) is part of a novel ubiquitin-like modification system involved in maintaining ER homeostasis. Among the components of the Ufm1 system, Regulator of C53 and DDRGK1 (RCAD) has recently been identified as an Ufm1-specific E3 ligase that promotes ufmylation of DDRGK1, a RCAD-interacting protein. We determined the importance of RCAD in the proper synthesis and secretion of pancreatic enzymes using RCAD-deficient mice...
January 19, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28102850/japanese-encephalitis-virus-induces-human-neural-stem-progenitor-cell-death-by-elevating-grp78-phb-and-hnrnpc-through-er-stress
#9
Sriparna Mukherjee, Noopur Singh, Nabonita Sengupta, Mahar Fatima, Pankaj Seth, Anita Mahadevan, Susarla Krishna Shankar, Arindam Bhattacharyya, Anirban Basu
Japanese encephalitis virus (JEV), which is a causative agent of sporadic encephalitis, harbours itself inside the neural stem/progenitor cells. It is a well-known fact that JEV infects neural stem/progenitor cells and decreases their proliferation capacity. With mass spectrometry-based quantitative proteomic study, it is possible to reveal the impact of virus on the stem cells at protein level. Our aim was to perceive the stem cell proteomic response upon viral challenge. We performed a two-dimensional gel electrophoresis-based proteomic study of the human neural stem cells (hNS1 cell line) post JEV infection and found that 13 proteins were differentially expressed...
January 19, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28102311/plin2-is-a-key-regulator-of-the-unfolded-protein-response-and-endoplasmic-reticulum-stress-resolution-in-pancreatic-%C3%AE-cells
#10
Elaine Chen, Tsung Huang Tsai, Lan Li, Pradip Saha, Lawrence Chan, Benny Hung-Junn Chang
Progressive pancreatic β cell failure underlies the transition of impaired glucose tolerance to overt diabetes; endoplasmic reticulum (ER) stress expedites β cell failure in this situation. ER stress can be elicited by lipotoxicity and an increased demand for insulin in diabetes. We previously reported that the lipid droplet protein perilipin 2 (PLIN2) modulates lipid homeostasis in the liver. Here, we show that PLIN2 modulates the unfolded protein response (UPR) and ER stress in pancreatic β cells. PLIN2 expression goes up when β cells are exposed to a lipid load or to chemical ER stress inducers...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28100868/growth-inhibition-of-refractory-human-gallbladder-cancer-cells-by-retinol-and-its-mechanism-of-action
#11
Chuan Li, Masahiko Imai, Shinya Hasegawa, Masahiro Yamasaki, Noriko Takahashi
Among the constituents of the essential nutrient vitamin A, retinol is a potent suppressor of refractory cancer cell growth linked to tumor progression, showing greater efficacy than retinoic acid (RA). However, the mechanisms of retinol action on human refractory cancer are not known well. In the current study, we examined the actions of retinol on proliferation of human gallbladder cancer NOZ C-1 cells. Retinol and RA inhibited the proliferation of human NOZ C-1 cells in dose-dependent manner, while RA was less potent than retinol...
January 18, 2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28100841/cannabinoids-a-new-weapon-against-cancer
#12
Małgorzata Pokrywka, Joanna Góralska, Bogdan Solnica
Cannabis has been cultivated by man since Neolithic times. It was used, among others for fiber and rope production, recreational purposes and as an excellent therapeutic agent. The isolation and characterization of the structure of one of the main active ingredients of cannabis - Δ9 - tetrahydrocannabinol as well the discovery of its cannabinoid binding receptors CB1 and CB2, has been a milestone in the study of the possibilities of the uses of Cannabis sativa and related products in modern medicine. Many scientific studies indicate the potential use of cannabinoids in the fight against cancer...
December 29, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28100648/multi-scale-structural-analysis-of-plant-er-pm-contact-sites
#13
Heather E McFarlane, Eun Kyoung Lee, Laura S van Bezouwen, Bradford Ross, Abel Rosado, A Lacey Samuels
Membrane contact sites (MCS) are recognized across eukaryotic systems as important nanostructures. Endoplasmic reticulum (ER)-plasma membrane (PM) contact sites (EPCS) are involved in excitation-contraction coupling, signalling, and plant responses to stress. In this report, we perform a multi-scale structural analysis of Arabidopsis EPCS that combine live cell imaging, quantitative transmission electron microscopy (TEM), and electron tomography over a developmental gradient. To place EPCS in the context of the entire cortical ER, we examined GFP-HDEL in living cells over a developmental gradient, then SYT1-GFP was used as a specific marker of EPCS...
January 18, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28100484/atf6-knock-down-decreases-apoptosis-arrests-the-s-phase-of-the-cell-cycle-and-increases-steroid-hormone-production-in-mouse-granulosa-cells
#14
Yongjie Xiong, Huatao Chen, Pengfei Lin, Aihua Wang, Lei Wang, Yaping Jin
Activating transcription factor 6 (ATF6) is an important factor in the endoplasmic reticulum (ER) stress signaling pathway. The aim of this study was to assess the role of ATF6 in mouse granulosa cells with respect to apoptosis, the cell cycle, and steroid hormone production, as well as several key genes related to follicular development, via RNA interference, immunohistochemical staining, real-time quantitative polymerase chain reaction, western blotting, flow cytometry, TUNEL assay, and ELISA. Immunohistochemical staining revealed that ATF6 was extensively distributed in the granulosa cells of various ovarian follicles and oocytes in adult female mice...
January 18, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28099257/antifibrotic-effect-of-saturated-fatty-acids-via-endoplasmic-reticulum-stress-response-in-rat-pancreatic-stellate-cells
#15
Lingaku Lee, Tetsuhide Ito, Taichi Nakamura, Robert T Jensen, Hisato Igarashi, Ryoichi Takayanagi
OBJECTIVES: We investigated the effect of saturated fatty acids on chronic pancreatitis pathogenesis by elucidating the endoplasmic reticulum (ER) stress response in pancreatic stellate cells (PSCs), which are major effector cells in pancreatic fibrosis. METHODS: Wistar Bonn/Kobori rats were fed either control diet or high-fat diet (HFD) for 4 weeks. Meanwhile, cultured rat PSCs were stimulated with thapsigargin, an ER stress inducer, or palmitic acid (PA). Pancreatic fibrosis, expressions of fibrosis-related and ER stress-related proteins and mRNA, cell viability, and apoptosis were examined...
January 18, 2017: Pancreas
https://www.readbyqxmd.com/read/28098884/renin-angiotensin-system-activation-accelerates-atherosclerosis-in-experimental-renal-failure-by-promoting-endoplasmic-reticulum-stress-related-inflammation
#16
Jia Yang, Xi Zhang, Xinyi Yu, Weixue Tang, Hua Gan
In this study, we investigated the association between the renin-angiotensin system (RAS), endoplasmic reticulum (ER) stress and atherosclerosis (AS) in uremic apolipoprotein E knockout (apoE-/-) mice. Mild uremia was induced by a 5/6 nephrectomy (5/6 Nx) in 10-week-old apoE-/- mice. Four weeks after nephrectomy, the mice received losartan or no treatment for 16 weeks. Sham-operated mice served as the controls. We found that uremia accelerated AS at the aortic root. The activation of ER stress and the significant upregulation of pro-inflammatory cytokines and chemokines were observed in the uremic mice...
January 12, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28098843/perm-hypothesis-the-fundamental-machinery-able-to-elucidate-the-role-of-xenobiotics-and-hormesis-in-cell-survival-and-homeostasis
#17
REVIEW
Salvatore Chirumbolo, Geir Bjørklund
In this article the Proteasome, Endoplasmic Reticulum and Mitochondria (PERM) hypothesis is discussed. The complex machinery made by three homeostatic mechanisms involving the proteasome (P), endoplasmic reticulum (ER) and mitochondria (M) is addressed in order to elucidate the beneficial role of many xenobiotics, either trace metals or phytochemicals, which are spread in the human environment and in dietary habits, exerting their actions on the mechanisms underlying cell survival (apoptosis, cell cycle regulation, DNA repair and turnover, autophagy) and stress response...
January 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28097745/immature-core-protein-of-hepatitis-c-virus-induces-an-unfolded-protein-response-through-inhibition-of-erad-l-in-a-yeast-model-system
#18
Shota Takahashi, Naoko Sato, Junichi Kikuchi, Hideaki Kakinuma, Jun Okawa, Yukiko Masuyama, Singo Iwasa, Hayato Irokawa, Gi-Wook Hwang, Akira Naganuma, Michinori Kohara, Shusuke Kuge
The structural protein Core of hepatitis C virus (HCV), a cytosolic protein, induces endoplasmic reticulum (ER) stress and unfolded protein response (UPR) in hepatocytes, and is responsible for the pathogenesis of persistent HCV infection. Using yeast as a model system, we evaluated mechanisms underlying Core-induced interference of ER homeostasis and UPR, and found that UPR is induced by the immature Core (aa 1-191, Core191) but not by the mature Core (aa 1-177, Core177). Interestingly, Core191 inhibits both ERAD-L, a degradation system responsible for misfolded/unfolded proteins in the ER lumen, and ERAD-M, a degradation system responsible for proteins carrying a misfolded/unfolded region in the ER membrane...
January 18, 2017: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
https://www.readbyqxmd.com/read/28095860/mouse-models-of-atherosclerosis-a-historical-perspective-and-recent-advances
#19
REVIEW
Yee Ting Lee, Hiu Yu Lin, Yin Wah Fiona Chan, Ka Hou Christien Li, Olivia Tsz Ling To, Bryan P Yan, Tong Liu, Guangping Li, Wing Tak Wong, Wendy Keung, Gary Tse
Atherosclerosis represents a significant cause of morbidity and mortality in both the developed and developing countries. Animal models of atherosclerosis have served as valuable tools for providing insights on its aetiology, pathophysiology and complications. They can be used for invasive interrogation of physiological function and provide a platform for testing the efficacy and safety of different pharmacological therapies. Compared to studies using human subjects, animal models have the advantages of being easier to manage, with controllable diet and environmental risk factors...
January 17, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28094778/adipocyte-fatty-acid-binding-protein-potentiates-toxic-lipids-induced-endoplasmic-reticulum-stress-in-macrophages-via-inhibition-of-janus-kinase-2-dependent-autophagy
#20
Ruby L C Hoo, Lingling Shu, Kenneth K Y Cheng, Xiaoping Wu, Boya Liao, Donghai Wu, Zhiguang Zhou, Aimin Xu
Lipotoxicity is implicated in the pathogenesis of obesity-related inflammatory complications by promoting macrophage infiltration and activation. Endoplasmic reticulum (ER) stress and adipocyte fatty acid binding protein (A-FABP) play key roles in obesity and mediate inflammatory activity through similar signaling pathways. However, little is known about their interplay in lipid-induced inflammatory responses. Here, we showed that prolonged treatment of palmitic acid (PA) increased ER stress and expression of A-FABP, which was accompanied by reduced autophagic flux in macrophages...
January 17, 2017: Scientific Reports
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