scholarly journals NOD1/NOD2 and RIP2 Regulate Endoplasmic Reticulum Stress-Induced Inflammation during Chlamydia Infection

mBio ◽  
2020 ◽  
Vol 11 (3) ◽  
Author(s):  
Oanh H. Pham ◽  
Bokyung Lee ◽  
Jasmine Labuda ◽  
A. Marijke Keestra-Gounder ◽  
Mariana X. Byndloss ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Inflammatory Response ◽  
Endoplasmic Reticulum Stress ◽  
Er Stress ◽  
Young Women ◽  
The United States ◽  
Chlamydia Infection ◽  
Er Stress Response

ABSTRACT The inflammatory response to Chlamydia infection is likely to be multifactorial and involve a variety of ligand-dependent and -independent recognition pathways. We previously reported the presence of NOD1/NOD2-dependent endoplasmic reticulum (ER) stress-induced inflammation during Chlamydia muridarum infection in vitro, but the relevance of this finding to an in vivo context is unclear. Here, we examined the ER stress response to in vivo Chlamydia infection. The induction of interleukin 6 (IL-6) production after systemic Chlamydia infection correlated with expression of ER stress response genes. Furthermore, when tauroursodeoxycholate (TUDCA) was used to inhibit the ER stress response, an increased bacterial burden was detected, suggesting that ER stress-driven inflammation can contribute to systemic bacterial clearance. Mice lacking both NOD1 and NOD2 or RIP2 exhibited slightly higher systemic bacterial burdens after infection with Chlamydia. Overall, these data suggest a model where RIP2 and NOD1/NOD2 proteins link ER stress responses with the induction of Chlamydia-specific inflammatory responses. IMPORTANCE Understanding the initiation of the inflammatory response during Chlamydia infection is of public health importance given the impact of this disease on young women in the United States. Many young women are chronically infected with Chlamydia but are asymptomatic and therefore do not seek treatment, leaving them at risk of long-term reproductive harm due to inflammation in response to infection. Our manuscript explores the role of the endoplasmic reticulum stress response pathway initiated by an innate receptor in the development of this inflammation.

scholarly journals Liver-specific deletion of protein tyrosine phosphatase (PTP) 1B improves obesity- and pharmacologically induced endoplasmic reticulum stress

2011 ◽  
Vol 438 (2) ◽  
pp. 369-378 ◽  
Author(s):  
Abdelali Agouni ◽  
Nimesh Mody ◽  
Carl Owen ◽  
Alicja Czopek ◽  
Derek Zimmer ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Insulin Sensitivity ◽  
Er Stress ◽  
Protein Tyrosine Phosphatase ◽  
Mouse Liver ◽  
Tyrosine Phosphatase ◽  
Er Stress Response

Obesity is associated with induction of the ER (endoplasmic reticulum)-stress response signalling and insulin resistance. PTP1B (protein tyrosine phosphatase 1B) is a major regulator of adiposity and insulin sensitivity. The aim of the present study was to investigate the role of L-PTP1B (liver-specific PTP1B) in chronically HFD (high-fat diet) and pharmacologically induced (tunicamycin and thapsigargin) ER-stress response signalling in vitro and in vivo. We assessed the effects of ER-stress response induction on hepatic PTP1B expression, and consequences of hepatic-PTP1B deficiency, in cells and mouse liver, on components of ER-stress response signalling. We found that PTP1B protein and mRNA expression levels were up-regulated in response to acute and/or chronic ER stress, in vitro and in vivo. Silencing PTP1B in hepatic cell lines or mouse liver (L-PTP1B−/−) protected against induction of pharmacologically induced and/or obesity-induced ER stress. The HFD-induced increase in CHOP (CCAAT/enhancer-binding protein homologous protein) and BIP (binding immunoglobulin protein) mRNA levels were partially inhibited, whereas ATF4 (activated transcription factor 4), GADD34 (growth-arrest and DNA-damage-inducible protein 34), GRP94 (glucose-regulated protein 94), ERDJ4 (ER-localized DnaJ homologue) mRNAs and ATF6 protein cleavage were completely suppressed in L-PTP1B−/− mice relative to control littermates. L-PTP1B−/− mice also had increased nuclear translocation of spliced XBP-1 (X box-binding protein-1) via increased p85α binding. We demonstrate that the ER-stress response and L-PTP1B expression are interlinked in obesity- and pharmacologically induced ER stress and this may be one of the mechanisms behind improved insulin sensitivity and lower lipid accumulation in L-PTP1B−/− mice.

Co-Treatment with Panobinostat Enhances Bortezomib-Induced Unfolded Protein Response, Endoplasmic Reticulum Stress and Apoptosis of Human Mantle Cell Lymphoma Cells

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 887-887 ◽  
Author(s):  
Rekha Rao ◽  
Warren Fiskus ◽  
Yonghua Yang ◽  
Rajeshree Joshi ◽  
Pravina Fernandez ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Er Stress ◽  
Mantle Cell Lymphoma ◽  
Cell Lymphoma ◽  
Unfolded Protein ◽  
Er Stress Response ◽  
Mantle Cell ◽  
Protein Response

Abstract The 26S proteasome inhibitor bortezomib (BZ), which increases intracellular unfolded protein levels and toxicity through endoplasmic reticulum (ER) stress response, was shown to have a single agent activity in relapsed mantle cell lymphoma (MCL). Here we have determined that treatment with hydroxamic acid analogue (HA) pan-histone deacetylase (HDAC) inhibitor (HDI), e.g., panobinostat (LBH589, Novartis Pharmaceuticals Inc) induces the CDK inhibitors p21 and p27, and attenuates the levels of c-Myc, CDK4 and cyclin D1 in the cultured (Jeko-1, MO-2058 and Granta-519) and in primary patient-derived MCL cells. In a dose-dependent manner, panobinostat also induced Bax and Bak, and attenuated Bcl-xL, XIAP, survivin, AKT and c-Raf levels, resulting in growth inhibition and apoptosis of MCL cells. We have previously demonstrated that HDAC6 deacetylates heat shock protein (hsp) 90, as well as shuttles and sequesters misfolded and polyubiquitylated proteins into the protective perinuclear aggresome.. By inhibiting HDAC6, panobinostat (10 to 50 nM) induced acetylation of hsp90 in MCL cells. This inhibited the ATP binding and co-chaperone association, and abrogated the chaperone function of hsp90 for the MCL- relevant, hsp90 client proteins, e.g., cyclin D1, CDK4, c-Raf and AKT in the cultured and primary MCL cells. Panobinostat mediated inhibition of HDAC6 abrogated formation of the aggresome and augmented endoplasmic reticulum (ER)-based unfolded protein response (UPR). Treatment of MCL cells with BZ induced the formation of aggresome (as detected by confocal immuno-fluorescence microscopy and electron microscopy), as well as induced UPR and ER stress response. The latter was associated with BZ-mediated increased levels of GRP78, the spliced form of XBP1 (XBP1s) and p-eIF2α protein. As compared to the control siRNA treated cells, knockdown of GRP78 by siRNA markedly increased BZ-induced CHOP and Noxa levels and significantly augmented BZ-induced apoptosis of cultured MCL cells. Co-treatment of MCL cells with panobinostat abrogated BZ-induced aggresome formation, decreased the levels of ATF4, XBP1s and p-eIF2α, as well as increased the levels of CHOP, Noxa and GADD34. Ultrastructural analysis of Jeko-1 cells also revealed that co-treatment with panobinostat and BZ showed pronounced ER dilatation compared to panobinostat treatment alone, suggestive of enhanced ER stress. Higher and persistent CHOP and Noxa levels suggested a protracted ER-stress, associated with synergistic increase in apoptosis of MCL but not normal CD34+ bone marrow progenitor cells (p < 0.01). Conversely, knockdown of CHOP levels by siRNA significantly inhibited panobinostat and BZ-induced cell death of MCL cells. Results of ongoing in vivo studies of panobinostat and/or BZ in the NOD/SCID mouse xenograft model of Jeko-1 MCL cells will be presented. These findings strongly support further in vivo evaluation of the efficacy of the combination of panobinostat with BZ against human MCL. Additionally, the findings create the rationale to develop targeted knockdown of GRP78 as a novel strategy to augment lethal ER stress due to panobinostat and BZ and resulting activity against MCL cells.

scholarly journals Endoplasmic Reticulum Stress-Related Inflammation and Cardiovascular Diseases

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Tomomi Gotoh ◽  
Motoyoshi Endo ◽  
Yuichi Oike
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Cardiovascular Diseases ◽  
Inflammatory Response ◽  
Er Stress ◽  
Er Stress Response ◽  
Stress Response Pathway ◽  
Apoptosis Pathways ◽  
Novel Target ◽  
Stress Pathway

The endoplasmic reticulum (ER) is the site of synthesis and maturation of proteins designed for secretion or for localization on the cell membrane. Various types of stress from both inside and outside cells disturb ER function, thus causing unfolded or misfolded proteins to accumulate in the ER. To improve and maintain the ER functions against such stresses, the ER stress response pathway is activated. However, when the stress is prolonged or severe, apoptosis pathways are activated to remove damaged cells. It was recently reported that the ER stress pathway is also involved in the inflammatory response, whereby inflammation induces ER stress, and ER stress induces an inflammatory response. Therefore, the ER stress response pathway is involved in various diseases, including cardiovascular diseases such as atherosclerosis and ischemic diseases, in various ways. The ER stress pathway may represent a novel target for the treatment of these diseases.

scholarly journals Endoplasmic reticulum stress in glomerular epithelial cell injury

2011 ◽  
Vol 301 (3) ◽  
pp. F496-F508 ◽  
Author(s):  
Andrey V. Cybulsky ◽  
Tomoko Takano ◽  
Joan Papillon ◽  
Thomas M. Kitzler ◽  
Krikor Bijian
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Epithelial Cell ◽  
Er Stress ◽  
Cell Injury ◽  
Translation Initiation Factor ◽  
Initiation Factor ◽  
Glomerular Epithelial Cell ◽  
Er Stress Response

Focal segmental glomerulosclerosis (FSGS) may be associated with glomerular epithelial cell (GEC; podocyte) apoptosis due to acquired injury or mutations in specific podocyte proteins. This study addresses mediation of GEC injury, focusing on endoplasmic reticulum (ER) stress. We studied signaling in cultured GECs in the presence or absence of the extracellular matrix (ECM). Adhesion to collagen supports cell survival, but adhesion to plastic (loss of contact with ECM) leads to apoptosis. Compared with collagen-adherent cells, GECs on plastic showed increased protein misfolding in the ER, and an adaptive-protective ER stress response, including increased expression of ER chaperones, increased phosphorylation of eukaryotic translation initiation factor-2α (eIF2α), and a reduction in protein synthesis. Activation of these ER stress pathways counteracted apoptosis. However, tunicamycin (a potent stimulator of ER stress) changed the ER stress response from protective to cytotoxic, as tunicamycin induced the proapoptotic ER stress gene, C/EBP homologous protein-10, and exacerbated apoptosis in GECs adherent to plastic, but not collagen. In GECs adherent to plastic, adaptive ER stress was associated with an increase in polyubiquitinated proteins and “choking” of the proteasome. Furthermore, pharmacological inhibition of the proteasome induced ER stress in GECs. Finally, we show that ER stress (induction of ER chaperones and eIF2α phosphorylation) was evident in experimental FSGS in vivo. Thus interactions of GECs with ECM may regulate protein folding and induction of the ER stress response. FSGS is associated with induction of ER stress. Enhancing protective aspects of the ER stress response may reduce apoptosis and possibly glomerulosclerosis.

scholarly journals Melatonin Improves Endoplasmic Reticulum Stress-Mediated IRE1α Pathway in Zücker Diabetic Fatty Rat

2021 ◽  
Vol 14 (3) ◽  
pp. 232
Author(s):  
Samira Aouichat ◽  
Miguel Navarro-Alarcon ◽  
Pablo Alarcón-Guijo ◽  
Diego Salagre ◽  
Marwa Ncir ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Kidney Disease ◽  
Endoplasmic Reticulum Stress ◽  
Er Stress ◽  
Amino Terminal ◽  
Er Stress Response ◽  
Obesity And Diabetes ◽  
Renal Morphology ◽  
Zdf Rats

Obesity and diabetes are linked to an increased prevalence of kidney disease. Endoplasmic reticulum stress has recently gained growing importance in the pathogenesis of obesity and diabetes-related kidney disease. Melatonin, is an important anti-obesogenic natural bioactive compound. Previously, our research group showed that the renoprotective effect of melatonin administration was associated with restoring mitochondrial fission/fusion balance and function in a rat model of diabesity-induced kidney injury. This study was carried out to further investigate whether melatonin could suppress renal endoplasmic reticulum (ER) stress response and the downstream unfolded protein response activation under obese and diabetic conditions. Zücker diabetic fatty (ZDF) rats and lean littermates (ZL) were orally supplemented either with melatonin (10 mg/kg body weight (BW)/day) (M–ZDF and M–ZL) or vehicle (C–ZDF and C–ZL) for 17 weeks. Western blot analysis of ER stress-related markers and renal morphology were assessed. Compared to C–ZL rats, higher ER stress response associated with impaired renal morphology was observed in C–ZDF rats. Melatonin supplementation alleviated renal ER stress response in ZDF rats, by decreasing glucose-regulated protein 78 (GRP78), phosphoinositol-requiring enzyme1α (IRE1α), and ATF6 levels but had no effect on phospho–protein kinase RNA–like endoplasmic reticulum kinase (PERK) level. In addition, melatonin supplementation also restrained the ER stress-mediated apoptotic pathway, as indicated by decreased pro-apoptotic proteins phospho–c–jun amino terminal kinase (JNK), Bax, and cleaved caspase-3, as well as by upregulation of B cell lymphoma (Bcl)-2 protein. These improvements were associated with renal structural recovery. Taken together, our findings revealed that melatonin play a renoprotective role, at least in part, by suppressing ER stress and related pro-apoptotic IRE1α/JNK signaling pathway.

CD125-Expressing Myeloma: A Subgroup of Multiple Myeloma (MM) with Immature Phenotype, Endoplasmic Reticulum Stress Response and Low Sensitivity to Bortezomib

Blood ◽  
2010 ◽  
Vol 116 (21) ◽  
pp. 616-616
Author(s):  
Yawara Kawano ◽  
Yoshitaka Kikukawa ◽  
Miki Nakamura ◽  
Yutaka Okuno ◽  
Hiromichi Yuki ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Endoplasmic Reticulum Stress ◽  
Er Stress ◽  
Surface Antigen ◽  
High Expression ◽  
Expression Level ◽  
Er Stress Response ◽  
The Mean ◽  
Low Sensitivity

Abstract Abstract 616 Introduction Although marked heterogeneity in phenotypes of MM is known, classification of MM based on molecular expressions remains to be determined. During analysis of microarray data utilizing purified MM cells obtained from bortezomib-sensitive and resistant cases, we identified a 100-fold higher expression of CD125 in bortezomib-resistant MM cells. Because CD125, also known as interleukin-5 receptor alpha chain, is expressed on mature B cells undergoing class switch recombination, the existence of CD125 in MM cells may suggest that MM cells are at a less mature differentiation stage than plasma cells. We further tried to classify MM patients by analyzing correlations of CD125-expressions with other surface antigen expressions and endoplasmic reticulum stress (ER stress) response: the latter plays a crucial role in resistance to bortezomib. Correlation of CD125 expression with sensitivity to bortezomib therapy was also evaluated. Materials and Methods Bone marrow samples were obtained from MM patients under written informed consentaccording to Helsinki Declaration and processed for purification using CD138 immunomagnetic beads. Expressions of CD125 and spliced-XBP-1 (spliced-XBP-1 presence is a hallmark of activated ER stress response), were evaluated using real time PCR. Flowcytometry analysis was performed using gating CD38 bright population at SRL laboratory Inc. (Tokushima, Japan). Response to bortezomib was assessed according to the international myeloma working group criteria. Results CD125 expression was found in MM cells at various levels. When it was compared to other surface antigen expressions, MM cells with expression of CD125 tend to express both CD20 and CD45 (p<0.05). Expression of CD125 also correlated with high expression levels of XBP-1s (Figure 1, p<0.01). The mean expression level of CD125 in bortezomib resistant cases was 6.17 fold greater than that in sensitive cases (110.6 versus 17.9, respectively, p<0.05). The mean expression level of XBP-1s in bortezomib-resistant cases was 2.3-fold greater than that in sensitive cases (p=0.06), which might suggest a role of ER stress in the regulation of sensitivity to bortezomib, while further detailed study should be required. Conclusions The present results suggest that CD125-expression in MM may represent a distinctive disease marker, which features immature phenotype, high ER stress response, and low sensitivity to bortezomib. High expression of XBP-1s in bortezomib-resistant cases suggests that the existence of ER stress response prior to bortezomib exposure may be responsible for poor response to bortezomib. Further analysis of CD125-positive MM cells is important for clarifying tumorigenesis at early stages of B-cell differentiation and possibly developing a new therapeutic strategy targeting ER stress. Disclosures: No relevant conflicts of interest to declare.

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.

scholarly journals Endoplasmic Reticulum (ER) Stress Response Failure in Diseases

2020 ◽  
Vol 30 (9) ◽  
pp. 672-675 ◽  
Author(s):  
Kashi Raj Bhattarai ◽  
Manoj Chaudhary ◽  
Hyung-Ryong Kim ◽  
Han-Jung Chae
Keyword(s):  
Endoplasmic Reticulum ◽  
Stress Response ◽  
Er Stress ◽  
Er Stress Response

scholarly journals Regulation of Adipsin Expression by Endoplasmic Reticulum Stress in Adipocytes

Biomolecules ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 314
Author(s):  
Ka-Young Ryu ◽  
Eon Ju Jeon ◽  
Jaechan Leem ◽  
Jae-Hyung Park ◽  
Hochan Cho
Keyword(s):  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Peroxisome Proliferator ◽  
Adipose Tissues ◽  
Peroxisome Proliferator Activated Receptor ◽  
Er Stress Response ◽  
Stress Markers ◽  
Transcriptional Reprogramming

Adpsin is an adipokine that stimulates insulin secretion from β-cells and improves glucose tolerance. Its expression has been found to be markedly reduced in obese animals. However, it remains unclear what factors lead to downregulation of adipsin in the context of obesity. Endoplasmic reticulum (ER) stress response is activated in various tissues under obesity-related conditions and can induce transcriptional reprogramming. Therefore, we aimed to investigate the relationship between adipsin expression and ER stress in adipose tissues during obesity. We observed that obese mice exhibited decreased levels of adipsin in adipose tissues and serum and increased ER stress markers in adipose tissues compared to lean mice. We also found that ER stress suppressed adipsin expression via adipocytes-intrinsic mechanisms. Moreover, the ER stress-mediated downregulation of adipsin was at least partially attributed to decreased expression of peroxisome proliferator-activated receptor γ (PPARγ), a key transcription factor in the regulation of adipocyte function. Finally, treatment with chemical chaperones recovered the ER stress-mediated downregulation of adipsin and PPARγ in vivo and in vitro. Our findings suggest that activated ER stress in adipose tissues is an important cause of the suppression of adipsin expression in the context of obesity.

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