Substituted meso-vinyl-BODIPY as thiol-selective fluorogenic probes for sensing unfolded proteins in the endoplasmic reticulum

2021 ◽  
Vol 57 (14) ◽  
pp. 1818-1821
Author(s):  
Huiying Mu ◽  
Koji Miki ◽  
Takuya Kubo ◽  
Koji Otsuka ◽  
Kouichi Ohe
Keyword(s):  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Small Molecule ◽  
Protein Unfolding ◽  
Living Cells ◽  
Unfolded Proteins ◽  
Fluorogenic Probes

Thiol-selective probes based on BODIPY scaffold were developed for sensing small-molecule thiols and unfolded proteins. The good organelle specificity of probe enables its utility for reporting the protein unfolding under ER stress in living cells.

Inhibition of Autophagy Potentiated Hippocampal Cell Death Induced by Endoplasmic Reticulum Stress and its Activation by Trehalose Failed to be Neuroprotective

2019 ◽  
Vol 16 (1) ◽  
pp. 3-11
Author(s):  
Luisa Halbe ◽  
Abdelhaq Rami
Keyword(s):  
Endoplasmic Reticulum ◽  
Cell Death ◽  
Er Stress ◽  
Cell Damage ◽  
Protective Mechanism ◽  
Unfolded Proteins ◽  
Neuronal Viability ◽  
Hippocampal Cell ◽  
Trigger Cell Death ◽  
Autophagy Inhibition

Introduction: Endoplasmic reticulum (ER) stress induced the mobilization of two protein breakdown routes, the proteasomal- and autophagy-associated degradation. During ERassociated degradation, unfolded ER proteins are translocated to the cytosol where they are cleaved by the proteasome. When the accumulation of misfolded or unfolded proteins excels the ER capacity, autophagy can be activated in order to undertake the degradative machinery and to attenuate the ER stress. Autophagy is a mechanism by which macromolecules and defective organelles are included in autophagosomes and delivered to lysosomes for degradation and recycling of bioenergetics substrate. Materials and Methods: Autophagy upon ER stress serves initially as a protective mechanism, however when the stress is more pronounced the autophagic response will trigger cell death. Because autophagy could function as a double edged sword in cell viability, we examined the effects autophagy modulation on ER stress-induced cell death in HT22 murine hippocampal neuronal cells. We investigated the effects of both autophagy-inhibition by 3-methyladenine (3-MA) and autophagy-activation by trehalose on ER-stress induced damage in hippocampal HT22 neurons. We evaluated the expression of ER stress- and autophagy-sensors as well as the neuronal viability. Results and Conclusion: Based on our findings, we conclude that under ER-stress conditions, inhibition of autophagy exacerbates cell damage and induction of autophagy by trehalose failed to be neuroprotective.

scholarly journals Endoplasmic reticulum stress induces a novel Ca2+ signalling system initiated by Ca2+ microdomains

2020 ◽  
Author(s):  
Constanza Feliziani ◽  
Gonzalo Quasollo ◽  
Deborah Holstein ◽  
Macarena Fernandez ◽  
James C Paton ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Cell Model ◽  
Signal Transduction Pathway ◽  
Unfolded Proteins ◽  
Potent Inducer ◽  
Human Astrocytes ◽  
Receptor Isoforms ◽  
A Cell ◽  
Er Homeostasis

AbstractThe accumulation of unfolded proteins within the Endoplasmic Reticulum (ER) activates a signal transduction pathway termed the unfolded protein response (UPR), which attempts to restore ER homeostasis. If homeostasis cannot be restored, UPR signalling ultimately induces apoptosis. Ca2+ depletion in the ER is a potent inducer of ER stress. Despite the ubiquity of Ca2+ as intracellular messenger, the precise mechanism (s) by which Ca2+ release affects the UPR remains unknown. Use of a genetically encoded Ca2+ indicator (GCamP6) that is tethered to the ER membrane, uncovered novel Ca2+ signalling events initiated by Ca2+ microdomains in human astrocytes under ER stress, as well as in a cell model deficient in all three IP3 Receptor isoforms. Pharmacological and molecular studies indicate that these local events are mediated by translocons. Together, these data reveal the existence of a previously unrecognized mechanism by which stressor-mediated Ca2+ release regulates ER stress.

scholarly journals Activation of Mammalian Unfolded Protein Response Is Compatible with the Quality Control System Operating in the Endoplasmic Reticulum

2004 ◽  
Vol 15 (6) ◽  
pp. 2537-2548 ◽  
Author(s):  
Satomi Nadanaka ◽  
Hiderou Yoshida ◽  
Fumi Kano ◽  
Masayuki Murata ◽  
Kazutoshi Mori
Keyword(s):  
Quality Control ◽  
Endoplasmic Reticulum ◽  
Control System ◽  
Golgi Apparatus ◽  
Er Stress ◽  
Unfolded Protein Response ◽  
Secretory Pathway ◽  
Unfolded Proteins ◽  
Unfolded Protein ◽  
Protein Response

Newly synthesized secretory and transmembrane proteins are folded and assembled in the endoplasmic reticulum (ER) where an efficient quality control system operates so that only correctly folded molecules are allowed to move along the secretory pathway. The productive folding process in the ER has been thought to be supported by the unfolded protein response (UPR), which is activated by the accumulation of unfolded proteins in the ER. However, a dilemma has emerged; activation of ATF6, a key regulator of mammalian UPR, requires intracellular transport from the ER to the Golgi apparatus. This suggests that unfolded proteins might be leaked from the ER together with ATF6 in response to ER stress, exhibiting proteotoxicity in the secretory pathway. We show here that ATF6 and correctly folded proteins are transported to the Golgi apparatus via the same route and by the same mechanism under conditions of ER stress, whereas unfolded proteins are retained in the ER. Thus, activation of the UPR is compatible with the quality control in the ER and the ER possesses a remarkable ability to select proteins to be transported in mammalian cells in marked contrast to yeast cells, which actively utilize intracellular traffic to deal with unfolded proteins accumulated in the ER.

Endoplasmic reticulum stress regulates glutathione metabolism and activities of glutathione related enzymes in Arabidopsis

2018 ◽  
Vol 45 (2) ◽  
pp. 284 ◽  
Author(s):  
Baris Uzilday ◽  
Rengin Ozgur ◽  
A. Hediye Sekmen ◽  
Ismail Turkan
Keyword(s):  
Endoplasmic Reticulum ◽  
Protein Folding ◽  
Er Stress ◽  
Disulfide Bonds ◽  
Degradation Pathway ◽  
Glutathione Metabolism ◽  
Unfolded Proteins ◽  
Glutathione S Transferase ◽  
Glutathione Biosynthesis ◽  
Protein Disulfide

Stress conditions generate an extra load on protein folding machinery in the endoplasmic reticulum (ER) and if the ER cannot overcome this load, unfolded proteins accumulate in the ER lumen, causing ER stress. ER lumen localised protein disulfide isomerase (PDI) catalyses the generation of disulfide bonds in conjugation with ER oxidoreductase1 (ERO1) during protein folding. Mismatched disulfide bonds are reduced by the conversion of GSH to GSSG. Under prolonged ER stress, GSH pool is oxidised and H2O2 is produced via increased activity of PDI-ERO1. However, it is not known how glutathione metabolism is regulated under ER stress in plants. So, in this study, ER stress was induced with tunicamycin (0.15, 0.3, 0.45 μg mL–1 Tm) in Arabidopsis thaliana (L.) Heynh. Glutathione content was increased by ER stress, which was accompanied by induction of glutathione biosynthesis genes (GSH1, GSH2). Also, the apoplastic glutathione degradation pathway (GGT1) was induced. Further, the activities of glutathione reductase (GR), dehydroascorbate reductase (DHAR), glutathione peroxidase (GPX) and glutathione S-transferase (GST) were increased under ER stress. Results also showed that chloroplastic GPX genes were specifically downregulated with ER stress. This is the first report on regulation of glutathione metabolism and glutathione related enzymes in response to ER stress in plants.

scholarly journals BBF2H7, a Novel Transmembrane bZIP Transcription Factor, Is a New Type of Endoplasmic Reticulum Stress Transducer

2006 ◽  
Vol 27 (5) ◽  
pp. 1716-1729 ◽  
Author(s):  
Shinichi Kondo ◽  
Atsushi Saito ◽  
Shin-ichiro Hino ◽  
Tomohiko Murakami ◽  
Maiko Ogata ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Cell Death ◽  
Transcription Factor ◽  
Er Stress ◽  
Target Genes ◽  
Transmembrane Protein ◽  
Late Phase ◽  
Neuroblastoma Cell ◽  
Bzip Transcription Factor ◽  
Unfolded Proteins

ABSTRACT Endoplasmic reticulum (ER) stress transducers IRE1 (inositol requiring 1), PERK (PKR-like endoplasmic reticulum kinase), and ATF6 (activating transcription factor 6) are well known to transduce signals from the ER to the cytoplasm and nucleus when unfolded proteins accumulate in the ER. Recently, we identified OASIS (old astrocyte specifically induced substance) as a novel ER stress transducer expressed in astrocytes. We report here that BBF2H7 (BBF2 human homolog on chromosome 7), an ER-resident transmembrane protein with the bZIP domain in the cytoplasmic portion and structurally homologous to OASIS, is cleaved at the membrane in response to ER stress. The cleaved fragments of BBF2H7 translocate into the nucleus and can bind directly to cyclic AMP-responsive element sites to activate transcription of target genes. Interestingly, although BBF2H7 protein is not expressed under normal conditions, it is markedly induced at the translational level during ER stress, suggesting that BBF2H7 might contribute to only the late phase of unfolded protein response signaling. In a mouse model of focal brain ischemia, BBF2H7 protein is prominently induced in neurons in the peri-infarction region. Furthermore, in a neuroblastoma cell line, BBF2H7 overexpression suppresses ER stress-induced cell death, while small interfering RNA knockdown of BBF2H7 promotes ER stress-induced cell death. Taken together, our results suggest that BBF2H7 is a novel ER stress transducer and could play important roles in preventing accumulation of unfolded proteins in damaged neurons.

scholarly journals Possible involvement of endoplasmic reticulum stress in the pathogenesis of Alzheimer’s disease

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Toru Hosoi ◽  
Jun Nomura ◽  
Koichiro Ozawa ◽  
Akinori Nishi ◽  
Yasuyuki Nomura
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Quality Control ◽  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Protein Quality ◽  
Unfolded Proteins ◽  
Unfolded Protein ◽  
The Unfolded Protein Response ◽  
Protein Response

AbstractThe endoplasmic reticulum (ER) is an organelle that plays a crucial role in protein quality control such as protein folding. Evidence to indicate the involvement of ER in maintaining cellular homeostasis is increasing. However, when cells are exposed to stressful conditions, which perturb ER function, unfolded proteins accumulate leading to ER stress. Cells then activate the unfolded protein response (UPR) to cope with this stressful condition. In the present review, we will discuss and summarize recent advances in research on the basic mechanisms of the UPR. We also discuss the possible involvement of ER stress in the pathogenesis of Alzheimer’s disease (AD). Potential therapeutic opportunities for diseases targeting ER stress is also described.

scholarly journals Endoplasmic reticulum stress as target for treatment of hearing loss

STEMedicine ◽  
2020 ◽  
Vol 1 (3) ◽  
pp. e21
Author(s):  
Yanfei Wang ◽  
Zhigang Xu
Keyword(s):  
Endoplasmic Reticulum ◽  
Hearing Loss ◽  
Er Stress ◽  
Protein Biosynthesis ◽  
Unfolded Proteins ◽  
Unfolded Protein ◽  
Global Protein Synthesis ◽  
Acquired Hearing Loss ◽  
The Unfolded Protein Response ◽  
Protein Response

The endoplasmic reticulum (ER) plays pivotal roles in coordinating protein biosynthesis and processing. Under ER stress, when excessive misfolded or unfolded proteins are accumulated in the ER, the unfolded protein response (UPR) is activated. The UPR blocks global protein synthesis while activates chaperone expression, eventually leading to the alleviation of ER stress. However, prolonged UPR induces cell death. ER stress has been associated with various types of diseases. Recently, increasing evidences suggest that ER stress and UPR are also involved in hearing loss. In the present review, we will discuss the role of ER stress in hereditary hearing loss as well as acquired hearing loss. Moreover, we will discuss the emerging ER stress-based treatment of hearing loss. Further investigations are warranted to understand the mechanisms in detail how ER stress contributes to hearing loss, which will help us develop better ER stress-related treatments.

scholarly journals Ritonavir Interacts With Belinostat to Cause Endoplasmic Reticulum Stress and Histone Acetylation in Renal Cancer Cells

2016 ◽  
Vol 24 (5) ◽  
pp. 327-335 ◽  
Author(s):  
Makoto Isono ◽  
Akinori Sato ◽  
Kazuki Okubo ◽  
Takako Asano ◽  
Tomohiko Asano
Keyword(s):  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Histone Acetylation ◽  
Cancer Cells ◽  
Renal Cancer ◽  
Heat Shock Protein 90 ◽  
Unfolded Proteins ◽  
Chaperone Function ◽  
Stress Markers ◽  
Immunodeficiency Virus

The histone deacetylase (HDAC) inhibitor belinostat increases the amount of unfolded proteins in cells by promoting the acetylation of heat shock protein 90 (HSP90), thereby disrupting its chaperone function. The human immunodeficiency virus protease inhibitor ritonavir, on the other hand, not only increases unfolded proteins by suppressing HSP90 but also acts as a proteasome inhibitor. We thought that belinostat and ritonavir together would induce endoplasmic reticulum (ER) stress and kill renal cancer cells effectively. The combination of belinostat and ritonavir induced drastic apoptosis and inhibited the growth of renal cancer cells synergistically. Mechanistically, the combination caused ER stress (evidenced by the increased expression of the ER stress markers) and also enhanced histone acetylation by decreasing the expression of HDACs. To our knowledge, this is the first study that showed a beneficial combined effect of belinostat and ritonavir in renal cancer cells, providing a framework for testing the combination in renal cancer patients.

Endoplasmic reticulum stress in biological processing and disease

2021 ◽  
Vol 69 (2) ◽  
pp. 309-315
Author(s):  
Ali Riza Koksal ◽  
George Nicholas Verne ◽  
QiQi Zhou
Keyword(s):  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Chronic Diseases ◽  
Unfolded Proteins ◽  
Unfolded Protein ◽  
Inflammatory Bowel ◽  
The Unfolded Protein Response ◽  
Protein Response ◽  
Er Homeostasis ◽  
Multiple Signaling

The ability of translated cellular proteins to perform their functions requires their proper folding after synthesis. The endoplasmic reticulum (ER) is responsible for coordinating protein folding and maturation. Infections, genetic mutations, environmental factors and many other conditions can lead to challenges to the ER known as ER stress. Altering ER homeostasis results in accumulation of misfolded or unfolded proteins. To eliminate this problem, a response is initiated by the cell called the unfolded protein response (UPR), which involves multiple signaling pathways. Prolonged ER stress or a dysregulated UPR can lead to premature apoptosis and an exaggerated inflammatory response. Following these discoveries, ER stress was shown to be related to several chronic diseases, such as diabetes mellitus, neurodegenerative disorders, fatty liver disease and inflammatory bowel disease that have not yet been clearly demonstrated pathophysiologically. Here, we review the field and present up-to-date information on the relationship between biological processing, ER stress, UPR, and several chronic diseases.

Inhibition of PERK-dependent pro-adaptive signaling pathway as a promising approach for cancer treatment

2017 ◽  
Vol 89 (3) ◽  
pp. 7-10 ◽  
Author(s):  
Wioletta Rozpędek ◽  
Dariusz Pytel ◽  
Łukasz Dziki ◽  
Alicja Nowak ◽  
Adam Dziki ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Cancer Cells ◽  
Signaling Pathway ◽  
Cell Lines ◽  
Small Molecule ◽  
Colorectal Adenocarcinoma ◽  
Initiation Factor ◽  
Human Neuroblastoma ◽  
Ht 29

Endoplasmic Reticulum (ER) is an organelle that is vital for cell growth and maintenance of homeostasis. Recent studies have reported that numerous human diseases, including cancer, are strictly connected to disruption of ER homeostasis. In order to counteract adverse intracellular conditions, cancer cells induce protein kinase R (PKR)-like endoplasmic reticulum kinase (PERK)-dependent, pro-adaptive unfolded protein response (UPR) signaling branches. If ER stress is severe or prolonged, pro-adaptive signaling networks are insufficient, resulting in apoptotic cell death of cancer cells. The main aim: of the study was to evaluate the biological activity of a small-molecule PERK inhibitor GSK2606414 in two cancer cell lines - human neuroblastoma (SH-SY5Y) and human colorectal adenocarcinoma (HT-29) cell lines. We analyzed the level of phosphorylation of the eukaryotic initiation factor 2 (eIF2), which is the main substrate of PERK and a subsequent activator of UPR, which under long-term ER stress may evoke apoptotic death of cancer cells. Material and methods: In the study, we utilized commercially available cell lines of human colorectal adenocarcinoma HT-29 and human neuroblastoma SH-SY5Y. Cells were exposed to the tested PERK-dependent signaling inhibitor GSK2606414 in suitable culture media with addition of thapsigargin (500 nM) to induce ER stress. To identify the protein, Western blot with specific antibodies was used. Detection of immune complexes was performed using chemiluminescence. Results: We found a complete inhibition of p-eIF2α expression due to the GSK2606414 inhibitor in both cell lines, SH-SY5Y and HT-29. Conclusions: Currently available cancer treatments are insufficient and cause various side effects. It has been assumed that utilization of small-molecule inhibitors of the PERK-dependent signaling pathway, like GSK2606414, may switch the pro-adaptive branch of UPR to its pro-apoptotic branch. It is believed that the tested inhibitor GSK2606414 may become a promising treatment for many cancer types.

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