scholarly journals Vibrio vulnificusVvpE Stimulates IL-1β Production by the Hypomethylation of the IL-1β Promoter and NF-κB Activation via Lipid Raft–Dependent ANXA2 Recruitment and Reactive Oxygen Species Signaling in Intestinal Epithelial Cells

2015 ◽  
Vol 195 (5) ◽  
pp. 2282-2293 ◽  
Author(s):  
Sei-Jung Lee ◽  
Young Hyun Jung ◽  
Eun Ju Song ◽  
Kyung Ku Jang ◽  
Sang Ho Choi ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Epithelial Cells ◽  
Lipid Raft ◽  
Intestinal Epithelial Cells ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Intestinal Epithelial ◽  
Reactive Oxygen Species Signaling

scholarly journals Effect of Indoxyl Sulfate on the Repair and Intactness of Intestinal Epithelial Cells: Role of Reactive Oxygen Species’ Release

2019 ◽  
Vol 20 (9) ◽  
pp. 2280 ◽  
Author(s):  
Simona Adesso ◽  
Marco Ruocco ◽  
Shara Francesca Rapa ◽  
Fabrizio Dal Piaz ◽  
Biagio Raffaele Di Iorio ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Reactive Oxygen Species ◽  
Epithelial Cells ◽  
Intestinal Epithelial Cells ◽  
Cell Monolayer ◽  
Reactive Oxygen ◽  
Indoxyl Sulfate ◽  
Uremic Toxin ◽  
Oxygen Species ◽  
Intestinal Epithelial

Chronic kidney disease (CKD) is characterized by an oxidative stress status, driving some CKD-associated complications, even at the gastrointestinal level. Indoxyl Sulfate (IS) is a protein-bound uremic toxin, poorly eliminated by dialysis. This toxin is able to affect the intestinal system, but its molecular mechanism/s in intestinal epithelial cells (IECs) remain poorly understood. This study’s aim was to evaluate the effect of IS (31.2–250 µM) on oxidative stress in IEC-6 cells and on the intactness of IECs monolayers. Our results indicated that IS enhanced oxidative cell damage by inducing reactive oxygen species (ROS) release, reducing the antioxidant response and affecting Nuclear factor (erythroid-derived 2)-like 2 (Nrf2) nuclear translocation as well its related antioxidant enzymes. In the wound healing assay model, IS reduced IEC-6 migration, slightly impaired actin cytoskeleton rearrangement; this effect was associated with connexin 43 alteration. Moreover, we reported the effect of CKD patients’ sera in IEC-6 cells. Our results indicated that patient sera induced ROS release in IEC-6 cells directly related to IS sera content and this effect was reduced by AST-120 serum treatment. Results highlighted the effect of IS in inducing oxidative stress in IECs and in impairing the intactness of the IECs cell monolayer, thus significantly contributing to CKD-associated intestinal alterations.

Involvement of reactive oxygen species in indomethacin-induced apoptosis of small intestinal epithelial cells

2009 ◽  
Vol 44 (S19) ◽  
pp. 30-34 ◽  
Author(s):  
Tatsushi Omatsu ◽  
Yuji Naito ◽  
Osamu Handa ◽  
Natsuko Hayashi ◽  
Katsura Mizushima ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Epithelial Cells ◽  
Intestinal Epithelial Cells ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Intestinal Epithelial ◽  
Small Intestinal ◽  
Induced Apoptosis

7 LACTOBACILLUS REUTERI SUPPRESSES PRO-INFLAMMATORY DRIVEN REACTIVE OXYGEN SPECIES IN VITRO IN HUMAN INTESTINAL EPITHELIAL CELLS AND IN VIVO IN A TNBS COLITIS MOUSE MODEL

2020 ◽  
Vol 26 (Supplement_1) ◽  
pp. S41-S41 ◽  
Author(s):  
Wenly Ruan ◽  
Melinda Engevik ◽  
Alexandra Chang-Graham ◽  
Joseph Hyser ◽  
James Versalovic
Keyword(s):  
Reactive Oxygen Species ◽  
Epithelial Cells ◽  
Lactobacillus Reuteri ◽  
Intestinal Inflammation ◽  
Intestinal Epithelial Cells ◽  
Oxygen Species ◽  
Intestinal Epithelial ◽  
Colitis Model

Abstract Background Reactive oxygen species (ROS) play a role in maintaining intestinal epithelial homeostasis and are normally kept at low levels via antioxidant compounds. Dysregulation of ROS can lead to intestinal inflammation and contribute to inflammatory bowel disease (IBD). Select gut microbes possess the enzymatic machinery to produce antioxidants whereas others can dysregulate levels of ROS. Our model microbe, Lactobacillus reuteri (ATCC PTA 6475), has been demonstrated to reduce intestinal inflammation in mice models. It contains the genes encoding two distinct GshA-like glutamylcysteine ligases. We hypothesize that L. reuteri can secrete γ-glutamylcysteine to suppress ROS, minimize NFκB activation and regulate secretion of e pithelial cytokines. Methods & Results Conditioned media from L. reuteri was analyzed via mass spectrometry to confirm the presence of γ-glutamylcysteine. All cysteine containing products including γ-glutamylcysteine were fluorescently tagged in the conditioned media and then incubated with HT29 cell monolayers as well as human jejunal enteroid (HJE) monolayers. γ-glutamylcysteine was demonstrated to enter intestinal epithelial cells based on microscopy. Next, a Thioltracker assay was used to show increased intracellular glutathione levels by L. reuteri secreted γ-glutamylcysteine. HT29 cells and HJEs were then treated with IL-1β or hydrogen peroxide, and L. reuteri metabolites as well as γ-glutamylcysteine significantly suppressed pro-inflammatory cytokine driven ROS and IL-8 production. L. reuteri secreted products also reduced activity of NFκB as determined by a luciferase reporter assay. γ-glutamylcysteine deficient mutants were generated by targeted mutagenesis of GshA genes, and these mutant L. reuteri strains had a diminished ability to suppress IL-8 production and ROS. To further test the role of L. reuteri secreted γ-glutamylcysteine in vivo, a 2,4,6-Trinitrobenzenesulfonic acid (TNBS)- induced mouse colitis model was used. Adolescent mice were orogavaged with PBS, L. reuteri, L. reuteri GshA2 mutant, or γ-glutamylcysteine for a week after which TNBS was rectally administered to induce colitis. We demonstrate that L. reuteri and γ-glutamylcysteine can suppress histologic inflammation compared to PBS control and L. reuteri GshA2 mutant groups. Conclusions Together these data indicate that L. reuteri secretes γ-glutamylcysteine which can enter the intestinal epithelial cells and modulate epithelial cytokine production. It acts via suppression of ROS and NFκB which then decreases IL-8 production. We are able to demonstrate this in vitro in both HT 29 cells and HJEs. We now also demonstrate this in vivo in a mouse colitis model. These experiments highlight a prominent role for ROS intermediates in microbiome-mammalian cell signaling processes involved in immune responses and intestinal inflammation.

TNF-α/cycloheximide-induced apoptosis in intestinal epithelial cells requires Rac1-regulated reactive oxygen species

2008 ◽  
Vol 294 (4) ◽  
pp. G928-G937 ◽  
Author(s):  
Shi Jin ◽  
Ramesh M. Ray ◽  
Leonard R. Johnson
Keyword(s):  
Reactive Oxygen Species ◽  
Epithelial Cells ◽  
Intestinal Epithelial Cells ◽  
Ros Production ◽  
Oxygen Species ◽  
Intestinal Epithelial ◽  
Mitochondrial Ros ◽  
Apoptosis Inhibition ◽  
Tnf Α ◽  
Induced Apoptosis

Previously we have shown that both Rac1 and c-Jun NH2-terminal kinase (JNK1/2) are key proapoptotic molecules in tumor necrosis factor (TNF)-α/cycloheximide (CHX)-induced apoptosis in intestinal epithelial cells, whereas the role of reactive oxygen species (ROS) in apoptosis is unclear. The present studies tested the hypothesis that Rac1-mediated ROS production is involved in TNF-α-induced apoptosis. In this study, we showed that TNF-α/CHX-induced ROS production and hydrogen peroxide (H2O2)-induced oxidative stress increased apoptosis. Inhibition of Rac1 by a specific inhibitor NSC23766 prevented TNF-α-induced ROS production. The antioxidant, N-acetylcysteine (NAC), or rotenone (Rot), the mitochondrial electron transport chain inhibitor, attenuated mitochondrial ROS production and apoptosis. Rot also prevented JNK1/2 activation during apoptosis. Inhibition of Rac1 by expression of dominant negative Rac1 decreased TNF-α-induced mitochondrial ROS production. Moreover, TNF-α-induced cytosolic ROS production was inhibited by Rac1 inhibition, diphenyleneiodonium (DPI, an inhibitor of NADPH oxidase), and NAC. In addition, DPI inhibited TNF-α-induced apoptosis as judged by morphological changes, DNA fragmentation, and JNK1/2 activation. Mitochondrial membrane potential change is Rac1 or cytosolic ROS dependent. Lastly, all ROS inhibitors inhibited caspase-3 activity. Thus these results indicate that TNF-α-induced apoptosis requires Rac1-dependent ROS production in intestinal epithelial cells.

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