scholarly journals Trehalose ameliorates oxidative stress-mediated mitochondrial dysfunction and ER stress via selective autophagy stimulation and autophagic flux restoration in osteoarthritis development

2017 ◽  
Vol 8 (10) ◽  
pp. e3081-e3081 ◽  
Author(s):  
Qian Tang ◽  
Gang Zheng ◽  
Zhenhua Feng ◽  
Yu Chen ◽  
Yiting Lou ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Er Stress ◽  
Mitochondrial Dysfunction ◽  
Autophagic Flux ◽  
Selective Autophagy

scholarly journals Relationship Between Oxidative Stress, ER Stress, and Inflammation in Type 2 Diabetes: The Battle Continues

2019 ◽  
Vol 8 (9) ◽  
pp. 1385 ◽  
Author(s):  
Burgos-Morón ◽  
Abad-Jiménez ◽  
Marañón ◽  
Iannantuoni ◽  
Escribano-López ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Insulin Resistance ◽  
Type 2 Diabetes ◽  
Er Stress ◽  
Mitochondrial Dysfunction ◽  
Current Knowledge ◽  
Β Cells ◽  
The Relationship ◽  
And Oxidative Stress

Type 2 diabetes (T2D) is a metabolic disorder characterized by hyperglycemia and insulin resistance in which oxidative stress is thought to be a primary cause. Considering that mitochondria are the main source of ROS, we have set out to provide a general overview on how oxidative stress is generated and related to T2D. Enhanced generation of reactive oxygen species (ROS) and oxidative stress occurs in mitochondria as a consequence of an overload of glucose and oxidative phosphorylation. Endoplasmic reticulum (ER) stress plays an important role in oxidative stress, as it is also a source of ROS. The tight interconnection between both organelles through mitochondrial-associated membranes (MAMs) means that the ROS generated in mitochondria promote ER stress. Therefore, a state of stress and mitochondrial dysfunction are consequences of this vicious cycle. The implication of mitochondria in insulin release and the exposure of pancreatic β-cells to hyperglycemia make them especially susceptible to oxidative stress and mitochondrial dysfunction. In fact, crosstalk between both mechanisms is related with alterations in glucose homeostasis and can lead to the diabetes-associated insulin-resistance status. In the present review, we discuss the current knowledge of the relationship between oxidative stress, mitochondria, ER stress, inflammation, and lipotoxicity in T2D.

scholarly journals FOXO1, a Potential Therapeutic Target, Regulates Autophagic Flux, Oxidative Stress, Mitochondrial Dysfunction, and Apoptosis in Human Cholangiocarcinoma QBC939 Cells

2018 ◽  
Vol 45 (4) ◽  
pp. 1506-1514 ◽  
Author(s):  
Wei He ◽  
Aiqing Zhang ◽  
Lei Qi ◽  
Chen Na ◽  
Rui Jiang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Mitochondrial Dysfunction ◽  
Therapeutic Target ◽  
Energy Homeostasis ◽  
Serum Starvation ◽  
Autophagic Flux ◽  
Potential Therapeutic Target ◽  
New Strategy ◽  
Underlying Mechanisms ◽  
Foxo1 Gene

Background/Aims: Autophagy is an evolutionarily conserved catabolic mechanism to maintain energy homeostasis and to remove damaged cellular components, which plays an important role in the survival of various cells. Inhibiting autophagy is often applied as a new strategy to halt the growth of cancer cells. Methods: The effect of FOXO1 gene on cellular function and apoptosis and its underlying mechanisms were investigated in cultured QBC939 cells by the methylthiazoletetrazolium (MTT) assay, western blot, DCFDA mitochondrial membrane potential, and ATP content measurement. FOXO1 siRNA was applied to down-regulate FOXO1 expression in QBC939 cells. Results: Here we reported that FOXO1, acetylation of FOXO1 (Ac-FOXO1) and the following interaction between Ac-FOXO1 and Atg7 regulated the basal and serum starvation (SS)-induced autophagy as evidenced by light chain 3 (LC3) accumulation and p62 degration. Either treatment with FOXO1 siRNA or resveratrol, a sirt1 agonist, inhibited autophagic flux, resulting in oxidative stress, mitochondrial dysfunction (MtD) and apoptosis in QBC939 cells, which were attenuated by enhancing autophagy with rapamycin. On the contrary, inhibiting autophagic flux with 3-MA worsened all these effects in QBC939 cells. Conclusions: Taken together, our study for the first time identified FOXO1 as a potential therapeutic target to cure against human cholangiocarcinoma via regulation of autophagy, oxidative stress and MtD.

scholarly journals Deltamethrin Induces Apoptosis in Cerebrum Neurons of Quail via Promoting Endoplasmic Reticulum Stress and Mitochondrial Dysfunction

2021 ◽  
Author(s):  
Pengfei Wu ◽  
Bing Han ◽  
Qingyue Yang ◽  
Siyu Li ◽  
Xiaoqiao Wang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Mitochondrial Dysfunction ◽  
Chronic Exposure ◽  
Molecular Mechanisms ◽  
Atp Content ◽  
Histological Changes ◽  
Real Time Quantitative Pcr ◽  
Induced Apoptosis

Abstract Deltamethrin (DLM) is a widely used and highly effective insecticide. DLM exposure is harmful to animal and human. Quail, as a bird model, has been widely used in the toxicology field. However, there is little information available in the literature about quail cerebrum damage caused by DLM. Here, we investigated the effect of DLM on quail cerebrum neurons. Four groups of healthy quails were assigned (10 quails in each group), respectively given 0, 15, 30, and 45 mg/kg DLM by gavage for 12 weeks. Through the measurements of quail cerebrum, it was found that DLM exposure induced obvious histological changes, oxidative stress, and neurons apoptosis. To further explore the possible molecular mechanisms, we performed real-time quantitative PCR to detect the expression of endoplasmic reticulum (ER) stress-related mRNA. In addition, we detected ATP content in quail cerebrum to evaluate the functional status of mitochondria. The study showed that DLM exposure significantly increased the expression of ER stress-related mRNA and decreased ATP content in quail cerebrum. These results suggest that chronic exposure to DLM induces apoptosis of quail cerebrum neurons via promoting ER stress and mitochondrial dysfunction. Furthermore, our results provide a novel explanation for DLM-induced apoptosis of avian cerebrum neurons.

scholarly journals Restoration of Autophagic Flux Rescues Oxidative Damage and Mitochondrial Dysfunction to Protect against Intervertebral Disc Degeneration

2019 ◽  
Vol 2019 ◽  
pp. 1-27 ◽  
Author(s):  
Liang Kang ◽  
Qian Xiang ◽  
Shengfeng Zhan ◽  
Yu Song ◽  
Kun Wang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Intervertebral Disc ◽  
Oxidative Damage ◽  
Mitochondrial Dysfunction ◽  
Disc Degeneration ◽  
Cell Apoptosis ◽  
Intervertebral Disc Degeneration ◽  
Autophagic Flux ◽  
Ecm Degradation

Oxidative stress-induced mitochondrial dysfunction and nucleus pulposus (NP) cell apoptosis play crucial roles in the development of intervertebral disc degeneration (IDD). Increasing studies have shown that interventions targeting impaired autophagic flux can maintain cellular homeostasis by relieving oxidative damage. Here, we investigated the effect of curcumin (CUR), a known autophagy activator, on IDD in vitro and in vivo. CUR suppressed tert-butyl hydroperoxide- (TBHP-) induced oxidative stress and mitochondrial dysfunction and thereby inhibited human NP cell apoptosis, senescence, and ECM degradation. CUR treatment induced autophagy and enhanced autophagic flux in an AMPK/mTOR/ULK1-dependent manner. Notably, CUR alleviated TBHP-induced interruption of autophagosome-lysosome fusion and impairment of lysosomal function and thus contributed to the restoration of blocked autophagic clearance. These protective effects of CUR in TBHP-stimulated human NP cells resembled the effects produced by the autophagy inducer rapamycin, but the effects were partially eliminated by 3-methyladenine- and compound C-mediated inhibition of autophagy initiation or chloroquine-mediated obstruction of autophagic flux. Lastly, CUR also exerted a protective effect against puncture-induced IDD progression in vivo. Our results showed that suppression of excessive ROS production and mitochondrial dysfunction through enhancement of autophagy coupled with restoration of autophagic flux ameliorated TBHP-induced human NP cell apoptosis, senescence, and ECM degradation. Thus, maintenance of the proper functioning of autophagy represents a promising therapeutic strategy for IDD, and CUR might serve as an effective therapeutic agent for IDD.

MiR-155 aggravated septic liver injury by oxidative stress-mediated ER stress and mitochondrial dysfunction via targeting Nrf-2

2018 ◽  
Vol 105 (3) ◽  
pp. 387-394 ◽  
Author(s):  
Zhao-Bin Yang ◽  
Wen-Wen Chen ◽  
Hui-Ping Chen ◽  
Shu-Xian Cai ◽  
Jian-Dong Lin ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Liver Injury ◽  
Er Stress ◽  
Mitochondrial Dysfunction

The Association of Neuronal Stress with Activating Transcription Factor 3 in Dorsal Root Ganglion of in vivo and in vitro Models of Bortezomib- Induced Neuropathy

2018 ◽  
Vol 19 (1) ◽  
pp. 50-64 ◽  
Author(s):  
Yiting Yin ◽  
Xin Qi ◽  
Yuan Qiao ◽  
Huaxiang Liu ◽  
Zihan Yan ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Er Stress ◽  
Mitochondrial Dysfunction ◽  
Cell Apoptosis ◽  
Activating Transcription Factor 3 ◽  
Drg Neurons ◽  
Activating Transcription Factor ◽  
Intracellular Oxidative Stress

Background: The notion that proteasome inhibitor bortezomib (BTZ) induced intracellular oxidative stress resulting in peripheral neuropathy has been generally accepted. The association of mitochondrial dysfunction, cell apoptosis, and endoplasmic reticulum (ER) stress with intracellular oxidative stress is ambiguous and still needs to be investigated. The activation of activating transcription factor 3 (ATF3) is a stress-hub gene which was upregulated in dorsal root ganglion (DRG) neurons after different kinds of peripheral nerve injuries. Objective: To investigate a mechanism underlying the action of BTZ-induced intracellular oxidative stress, mitochondrial dysfunction, cell apoptosis, and ER stress via activation of ATF3. </P><P> Methods: Primary cultured DRG neurons with BTZ induced neurotoxicity and DRG from BTZ induced painful peripheral neuropathic rats were used to approach these questions. Results: BTZ administration caused the upregulation of ATF3 paralleled with intracellular oxidative stress, mitochondrial dysfunction, cell apoptosis, and ER stress in DRG neurons both in vitro and in vivo. Blocking ATF3 signaling by small interfering RNA (siRNA) gene silencing technology resulted in decreased intracellular oxidative stress, mitochondrial dysfunction, cell apoptosis, and ER stress in DRG neurons after BTZ treatment. This study exhibited important mechanistic insight into how BTZ induces neurotoxicity through the activation of ATF3 resulting in intracellular oxidative stress, mitochondrial dysfunction, cell apoptosis, and ER stress and provided a novel potential therapeutic target by blocking ATF3 signaling.

scholarly journals DHA Protects Hepatocytes from Oxidative Injury through GPR120/ERK-Mediated Mitophagy

2021 ◽  
Vol 22 (11) ◽  
pp. 5675
Author(s):  
Jinglong Chen ◽  
Danping Wang ◽  
Yibo Zong ◽  
Xiaojing Yang
Keyword(s):  
Oxidative Stress ◽  
Oxidative Damage ◽  
Mitochondrial Dysfunction ◽  
Liver Diseases ◽  
Antioxidant Effect ◽  
Cellular Damage ◽  
Autophagic Flux

Oxidative stress occurs in a variety of clinical liver diseases and causes cellular damage and mitochondrial dysfunction. The clearance of damaged mitochondria by mitophagy may facilitate mitochondrial biogenesis and enhance cell survival. Although the supplementation of docosahexaenoic acid (DHA) has been recognized to relieve the symptoms of various liver diseases, the antioxidant effect of DHA in liver disease is still unclear. The purpose of our research was to investigate the antioxidant effect of DHA in the liver and the possible role of mitophagy in this. In vitro, H2O2-induced injury was caused in AML12 cells. The results showed that DHA repressed the level of reactive oxygen species (ROS) induced by H2O2 and stimulated the cellular antioxidation response. Most notably, DHA restored oxidative stress-impaired autophagic flux and promoted protective autophagy. In addition, PINK/Parkin-mediated mitophagy was activated by DHA in AML12 cells and alleviated mitochondrial dysfunction. The ERK1/2 signaling pathway was inhibited during oxidative stress but reactivated by DHA treatment. It was proven that the expression of ERK1/2 was involved in the regulation of mitophagy by the ERK1/2 inhibitor. We further proved these results in vivo. DHA effectively alleviated the liver oxidative damage caused by CCl4 and enhanced antioxidation capacity; intriguingly, autophagy was also activated. In summary, our data demonstrated that DHA protected hepatocytes from oxidative damage through GPR120/ERK-mediated mitophagy.

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