scholarly journals The ATF6 pathway of the ER stress response contributes to enhanced viability in glioblastoma

Oncotarget ◽  
2015 ◽  
Vol 7 (2) ◽  
pp. 2080-2092 ◽  
Author(s):  
David Y.A. Dadey ◽  
Vaishali Kapoor ◽  
Arpine Khudanyan ◽  
Fumihiko Urano ◽  
Albert H. Kim ◽  
...  
Keyword(s):  
Stress Response ◽  
Er Stress ◽  
Er Stress Response

scholarly journals Intestinal Phospholipid Disequilibrium Initiates an ER Stress Response That Drives Goblet Cell Necroptosis and Spontaneous Colitis in Mice

2020 ◽  
Author(s):  
John P. Kennelly ◽  
Stephanie Carlin ◽  
Tingting Ju ◽  
Jelske N. van der Veen ◽  
Randal C. Nelson ◽  
...  
Keyword(s):  
Stress Response ◽  
Er Stress ◽  
Goblet Cell ◽  
Er Stress Response

Targeted regulation of lymphocytic ER stress response with an overall immunosuppression to alleviate allograft rejection

Biomaterials ◽  
2021 ◽  
pp. 120757
Author(s):  
Yingying Shi ◽  
Yichao Lu ◽  
Chunqi Zhu ◽  
Zhenyu Luo ◽  
Xiang Li ◽  
...  
Keyword(s):  
Stress Response ◽  
Er Stress ◽  
Allograft Rejection ◽  
Er Stress Response

scholarly journals Highly Specialized Ubiquitin-Like Modifications: Shedding Light into the UFM1 Enigma

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 255
Author(s):  
Katharina F. Witting ◽  
Monique P.C. Mulder
Keyword(s):  
Dna Repair ◽  
Stress Response ◽  
Embryonic Development ◽  
Er Stress ◽  
Unmet Needs ◽  
Biological Function ◽  
Post Translational Modification ◽  
Er Stress Response ◽  
Cellular Events ◽  
Complex Signaling

Post-translational modification with Ubiquitin-like proteins represents a complex signaling language regulating virtually every cellular process. Among these post-translational modifiers is Ubiquitin-fold modifier (UFM1), which is covalently attached to its substrates through the orchestrated action of a dedicated enzymatic cascade. Originally identified to be involved embryonic development, its biological function remains enigmatic. Recent research reveals that UFM1 regulates a variety of cellular events ranging from DNA repair to autophagy and ER stress response implicating its involvement in a variety of diseases. Given the contribution of UFM1 to numerous pathologies, the enzymes of the UFM1 cascade represent attractive targets for pharmacological inhibition. Here we discuss the current understanding of this cryptic post-translational modification especially its contribution to disease as well as expand on the unmet needs of developing chemical and biochemical tools to dissect its role.

Abstract 292: The Role of the ATF6 Branch of the ER Stress Response in the Endocrine Heart

2016 ◽  
Vol 119 (suppl_1) ◽  
Author(s):  
Erik A Blackwood ◽  
Christopher C Glembotski
Keyword(s):  
Stress Response ◽  
Er Stress ◽  
Knockout Mice ◽  
Ex Vivo ◽  
Proteolytic Cleavage ◽  
Isolated Perfused Heart ◽  
Wild Type ◽  
Atrial Myocytes ◽  
Perfused Heart ◽  
Er Stress Response

Rationale: Atrial natriuretic peptide (ANP) is stored in the heart in large dense core granules of atrial myocytes as a biologically inactive precursor, pro-ANP. Hemodynamic stress and atrial stretch stimulate coordinate secretion and proteolytic cleavage of pro-ANP to its bioactive form, ANP, which promotes renal salt excretion and vasodilation, which, together contribute to decreasing blood pressure. While the ATF6 branch of the ER stress response has been studied in ventricular tissue mouse models of myocardial ischemia and pathological hypertrophy, roles for ATF6 and ER stress on the endocrine function of atrial myocytes have not been studied. Objective/Methods: To address this gap in our knowledge, we knocked down ATF6 in primary cultured neonatal rat atrial myocytes (NRAMs) using a chemical inhibitor of the proteolytic cleavage site enabling ATF6 activation and siRNA and measured ANP expression and secretion basally and in response to alpha- adrenergic agonist stimulation using phenylephrine. We also compared the ANP secretion from wild- type mice and ATF6 knockout mice in an ex vivo Langendorff model of the isolated perfused heart. Results: ATF6 knockdown in NRAMs significantly impaired basal and phenylephrine-stimulated ANP secretion. ATF6 knockout mice displayed lower levels of ANP in atrial tissue at baseline as well as after phenylephrine treatment. Similarly, in the ex vivo isolated perfused heart model, less ANP was detected in effluent of ATF6 knockout hearts compared to wild-type hearts. Conclusions: The ATF6 branch of the ER stress response is necessary for efficient co-secretional processing of pro-ANP to ANP and for agonist-stimulated ANP secretion from atrial myocytes. As ANP is secreted in a regulated manner in response to a stimulus and pro-ANP is synthesized and packaged through the classical secretory pathway, we posit that ATF6 is required for adequate expression, folding, trafficking, processing and secretion of biologically active ANP from the endocrine heart.

Abstract 415: Cardioprotective Effects of Interleukin-15 in Immortalized Human Ventricular Cardiomyocytes

2015 ◽  
Vol 117 (suppl_1) ◽  
Author(s):  
Marin Jane McBride ◽  
Kristina Durham ◽  
Bernardo L Trigatti
Keyword(s):  
Stress Response ◽  
Er Stress ◽  
Interleukin 2 ◽  
Cell Types ◽  
Human Cardiomyocytes ◽  
Er Stress Response ◽  
Distinct Cell ◽  
Receptor Chain ◽  
Interleukin 15 ◽  
Receptor Beta

Interleukin-15 (IL-15) is a pleotropic cytokine that has a profound effect on the proliferation, survival and differentiation of many distinct cell types. The IL-15 receptor complex has 3 subunits: the unique receptor chain IL-15 receptor alpha (IL-15Rα), and two receptor chains shared with interleukin-2 (IL-2) and/or other cytokines, referred to as IL-2 receptor beta (IL-2Rβ) and IL-2 receptor gamma/gamma common chain (IL-2Rγ/γc), respectively. To our knowledge, this is the first study to examine the effects of IL-15 in immortalized human cardiomyocytes. Data collected by RT-PCR shows mRNA expression of IL-15Rα, IL-2Rβ and IL-2 Rγ/γc in these cells. Additionally, western blotting for IL-15Rα, IL-2Rβ and IL-2 Rγ/γc confirms the presence of all three IL-15 receptors. Early experiments examining the effect of IL-15 on cardiomyocyte cell survival show a statistically significant protective effect of IL-15 on the survival of cells exposed to tunicamycin, a pharamacological endoplasmic reticulum (ER) stress inducing agent. These findings suggest that IL-15 signaling may be an important cardioprotective pathway that is involved in the cardiac ER stress response. As ER stress is a major component of multiple different cardiac pathologies, such as myocardial infarction, heart failure and diabetes, uncovering the molecular mechanism by which IL-15 protects the heart will allow for deeper understanding of the cardiac ER stress response.

scholarly journals C. sakazakii activates AIM2 pathway accompanying with excessive ER stress response in mammalian mammary gland epithelium

2020 ◽  
Vol 25 (2) ◽  
pp. 223-233 ◽  
Author(s):  
Wenjuan Song ◽  
Le Sheng ◽  
Fanghui Chen ◽  
Yu Tian ◽  
Lian Li ◽  
...  
Keyword(s):  
Mammary Gland ◽  
Stress Response ◽  
Er Stress ◽  
Er Stress Response

scholarly journals Constitutive Photomorphogenic 1 Enhances ER Stress Tolerance in Arabidopsis

2021 ◽  
Vol 22 (19) ◽  
pp. 10772
Author(s):  
Chang Ho Kang ◽  
Eun Seon Lee ◽  
Ganesh M. Nawkar ◽  
Joung Hun Park ◽  
Seong Dong Wi ◽  
...  
Keyword(s):  
Stress Response ◽  
Er Stress ◽  
Stress Conditions ◽  
Negative Regulator ◽  
Light Signaling ◽  
Dependent Manner ◽  
Wild Type ◽  
Er Stress Response ◽  
The Unfolded Protein Response ◽  
Mutant Locus

Interaction between light signaling and stress response has been recently reported in plants. Here, we investigated the role of CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1), a key regulator of light signaling, in endoplasmic reticulum (ER) stress response in Arabidopsis. The cop1-4 mutant Arabidopsis plants were highly sensitive to ER stress induced by treatment with tunicarmycin (Tm). Interestingly, the abundance of nuclear-localized COP1 increased under ER stress conditions. Complementation of cop1-4 mutant plants with the wild-type or variant types of COP1 revealed that the nuclear localization and dimerization of COP1 are essential for its function in plant ER stress response. Moreover, the protein amount of ELONGATED HYPOCOTYL 5 (HY5), which inhibits bZIP28 to activate the unfolded protein response (UPR), decreased under ER stress conditions in a COP1-dependent manner. Accordingly, the binding of bZIP28 to the BIP3 promoter was reduced in cop1-4 plants and increased in hy5 plants compared with the wild type. Furthermore, introduction of the hy5 mutant locus into the cop1-4 mutant background rescued its ER stress-sensitive phenotype. Altogether, our results suggest that COP1, a negative regulator of light signaling, positively controls ER stress response by partially degrading HY5 in the nucleus.

scholarly journals The dynamic effect of regulatory genetic variation on the in vivo ER stress transcriptional response

2021 ◽  
Author(s):  
Nikki D. Russell ◽  
Clement Y. Chow
Keyword(s):  
Genetic Variation ◽  
Stress Response ◽  
Er Stress ◽  
Transcriptional Response ◽  
Mouse Strains ◽  
Transcriptional Responses ◽  
Er Stress Response ◽  
Multiple Environments ◽  
Context Specific

AbstractGenotype x Environment (GxE) interactions occur when environmental conditions drastically change the effect of a genetic variant. In order to truly understand the effect of genetic variation, we need to incorporate multiple environments into our analyses. Many variants, under steady state conditions, may be silent or even have the opposite effect under stress conditions. This study uses an in vivo mouse model to investigate how the effect of genetic variation changes with tissue type and cellular stress. Endoplasmic reticulum (ER) stress occurs when misfolded proteins accumulate in the ER. This triggers the unfolded protein response (UPR), a large transcriptional response which attempts to return the cell to homeostasis. This transcriptional response, despite being a well conserved, basic cellular process, is highly variable across different genetic backgrounds, making it an ideal system to study GxE effects. In this study, we sought to better understand how genetic variation alters expression across tissues, in the presence and absence of ER stress. The use of different mouse strains and their F1s allow us to also identify context specific cis- and trans-regulatory mechanisms underlying variable transcriptional responses. We found hundreds of genes that respond to ER stress in a tissue- and/or genotype-dependent manner. Genotype-dependent ER stress-responsive genes are enriched for processes such as protein folding, apoptosis, and protein transport, indicating that some of the variability occurs in canonical ER stress factors. The majority of regulatory mechanisms underlying these variable transcriptional responses derive from cis-regulatory variation and are unique to a given tissue or ER stress state. This study demonstrates the need for incorporating multiple environments in future studies to better elucidate the effect of any particular genetic factor in basic biological pathways, like the ER stress response.Author SummaryThe effect of genetic variation is dependent on environmental context. Here we use genetically diverse mouse strains to understand how genetic variation interacts with stress state to produce variable transcriptional profiles. In this study, we take advantage of the endoplasmic reticulum (ER) stress response which is a large transcriptional response to misfolded proteins. Using this system, we uncovered tissue- and ER stress-specific effects of genetic variation on gene expression. Genes with genotype-dependent variable expression levels in response to ER stress were enriched for canonical ER stress functions, such as protein folding and transport. These variable effects of genetic variation are driven by unique sets of regulatory variation that are only active under context-specific circumstances. The results of this study highlight the importance of including multiple environments and genetic backgrounds when studying the ER stress response and other cellular pathways.

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