scholarly journals Different Effects of Metformin and A769662 on Sodium Iodate-Induced Cytotoxicity in Retinal Pigment Epithelial Cells: Distinct Actions on Mitochondrial Fission and Respiration

Antioxidants ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1057
Author(s):  
Chi-Ming Chan ◽  
Ponarulselvam Sekar ◽  
Duen-Yi Huang ◽  
Shu-Hao Hsu ◽  
Wan-Wan Lin
Keyword(s):  
Cell Death ◽  
Mitochondrial Dysfunction ◽  
Mitochondrial Respiration ◽  
Retinal Pigment ◽  
Mitochondrial Fission ◽  
Nicotinamide Adenine Dinucleotide Phosphate ◽  
Mitochondrial Morphology ◽  
Ros Production ◽  
Ampk Activation ◽  
Sodium Iodate

Oxidative stress-associated retinal pigment epithelium (RPE) cell death is critically implicated in the pathogenesis of visual dysfunction and blindness of retinal degenerative diseases. Sodium iodate (NaIO3) is an oxidative retinotoxin and causes RPE damage. Previously, we found that NaIO3 can induce human ARPE-19 cell death via inducing mitochondrial fission and mitochondrial dysfunction. Although metformin has been demonstrated to benefit several diseases possibly via AMP-activated protein kinase (AMPK) activation, it remains unknown how AMPK affects retinopathy in NaIO3 model. Therefore, in this study, we compared the effects of metformin and AMPK activator A769662 on NaIO3-induced cellular stress and toxicity. We found that A769662 can protect cells against NaIO3-induced cytotoxicity, while metformin exerts an enhancement in cell death. The mitochondrial reactive oxygen species (ROS) production as well as mitochondrial membrane potential loss induced by NaIO3 were not altered by both agents. In addition, NaIO3-induced cytosolic ROS production, possibly from nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activation and counteracting cell death, was not altered by A769662 and metformin. Notably, NaIO3-induced mitochondrial fission and inhibition of mitochondrial respiration for ATP turnover were reversed by A769662 but not by metformin. In agreement with the changes on mitochondrial morphology, the ERK-Akt signal axis dependent Drp-1 phosphorylation at S616 (an index of mitochondrial fission) under NaIO3 treatment was blocked by A769662, but not by metformin. In summary, NaIO3-induced cell death in ARPE cells primarily comes from mitochondrial dysfunction due to dramatic fission and inhibition of mitochondrial respiration. AMPK activation can exert a protection by restoring mitochondrial respiration and inhibition of ERK/Akt/Drp-1 phosphorylation, leading to a reduction in mitochondrial fission. However, inhibition of respiratory complex I by metformin might deteriorate mitochondrial dysfunction and cell death under NaIO3 stress.

Changes in Mitochondrial Morphology and Mitochondrial Fission/Fusion Gene Expression in Retinal Pigment Epithelial Cells During Oxidative Stress

2020 ◽  
Vol 12 (10) ◽  
pp. 1192-1199
Author(s):  
Zhi Ji ◽  
Xu Liu ◽  
Xia Wang ◽  
Yuan Ren ◽  
Ying Liu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Gene Expression ◽  
Cell Death ◽  
Mitochondrial Dysfunction ◽  
Retinal Pigment Epithelial ◽  
Fusion Gene ◽  
Cell Damage ◽  
Retinal Pigment ◽  
Mitochondrial Morphology ◽  
Pigment Epithelial

Age-related macular degeneration (AMD) represents a serious impairment for the elderly. Because the pathogenesis of AMD has not been completely defined, the available therapeutic treatments are not ideal. Retinal pigment epithelial (RPE) cells are essential for photoreceptor cell maintenance and survival; however, the mechanisms underlying RPE cell damage and AMD remains to be elucidated. It is known that abnormal mitochondrial gene expression causes mitochondrial dysfunction, induces cell damage, and results in disease. In this study, ARPE-19 cells were treated with different concentrations of H2O2. It was found that excessive H2O2 concentration resulted in significant contraction of ARPE-19 cells and increased cell death, and destruction of mitochondrial structure as well as membrane and crest. RT-PCR results showed that decreased expression of the Fis1 gene was evident in H2O2-treated cells. There were no significant differences observed among the different H2O2 concentration groups. The expression of the fission genes, MTP18 and Dnmp1, and the fusion genes, Mnf1 and Mnf2, was not significantly different. Real-time PCR results revealed that the expression of the Fis1 gene decreased concomitantly with different concentrations of H2O2, whereas the expression of the Mfn2 gene increased by treatment with 200 μMH2O2. There were no significant differences in the expression of the other genes. These results indicate that abnormal expression of the mitochondrial Fis1 fission gene, and the Mfn2 fusion gene caused mitochondrial dysfunction in ARPE-19 cells. This indicates that the imbalance of mitochondrial dynamics may contribute to cell death in an oxidative stress environment.

scholarly journals Differential ROS-Mediated Phosphorylation of Drp1 in Mitochondrial Fragmentation Induced by Distinct Cell Death Conditions in Cerebellar Granule Neurons

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Carolina Cid-Castro ◽  
Julio Morán
Keyword(s):  
Cell Death ◽  
Neuronal Death ◽  
Mitochondrial Fission ◽  
Cerebellar Granule Neurons ◽  
Mitochondrial Morphology ◽  
Granule Neurons ◽  
Ros Production ◽  
Mitochondrial Fragmentation ◽  
Cerebellar Granule ◽  
Mitochondrial Ros

Reactive oxygen species (ROS) production has been associated with neuronal death. ROS are also involved in mitochondrial fission, which is mediated by Dynamin-related protein 1 (Drp1). The regulation of mitochondrial fragmentation mediated by Drp1 and its relationship to mitochondrial ROS (mtROS) in neuronal death have not been completely clarified. The aim of this study is to evaluate the role of mtROS in cell death and their involvement in the activation of Drp1 and mitochondrial fission in a model of cell death of cultured cerebellar granule neurons (CGN). Neuronal death of CGN induced by potassium deprivation (K5) and staurosporine (ST) triggers mitochondrial ROS production and mitochondrial fragmentation. K5 condition evoked an increase of Drp1 phosphorylation at Ser616, but ST treatment led to a decrease of Drp1 phosphorylation. Moreover, the death of CGN induced by both K5 and ST was markedly reduced in the presence of MitoTEMPO; however, mitochondrial morphology was not recovered. Here, we show that the mitochondria are the initial source of ROS involved in the neuronal death of CGN and that mitochondrial fragmentation is a common event in cell death; however, this process is not mediated by Drp1 phosphorylation at Ser616.

scholarly journals High glucose induces Drp1-mediated mitochondrial fission via the Orai1 calcium channel to participate in diabetic cardiomyocyte hypertrophy

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Qing-Rui Wu ◽  
Dan-Lin Zheng ◽  
Pei-Ming Liu ◽  
Hui Yang ◽  
Lu-An Li ◽  
...  
Keyword(s):  
Calcium Channel ◽  
Mitochondrial Dysfunction ◽  
High Glucose ◽  
Mitochondrial Dynamics ◽  
Mitochondrial Fission ◽  
Calcium Handling ◽  
Cardiomyocyte Hypertrophy ◽  
Mitochondrial Morphology ◽  
Calmodulin Binding ◽  
Downstream Target

AbstractMitochondrial dysfunction and impaired Ca2+ handling are involved in the development of diabetic cardiomyopathy (DCM). Dynamic relative protein 1 (Drp1) regulates mitochondrial fission by changing its level of phosphorylation, and the Orai1 (Ca2+ release-activated calcium channel protein 1) calcium channel is important for the increase in Ca2+ entry into cardiomyocytes. We aimed to explore the mechanism of Drp1 and Orai1 in cardiomyocyte hypertrophy caused by high glucose (HG). We found that Zucker diabetic fat rats induced by administration of a high-fat diet develop cardiac hypertrophy and impaired cardiac function, accompanied by the activation of mitochondrial dynamics and calcium handling pathway-related proteins. Moreover, HG induces cardiomyocyte hypertrophy, accompanied by abnormal mitochondrial morphology and function, and increased Orai1-mediated Ca2+ influx. Mechanistically, the Drp1 inhibitor mitochondrial division inhibitor 1 (Mdivi-1) prevents cardiomyocyte hypertrophy induced by HG by reducing phosphorylation of Drp1 at serine 616 (S616) and increasing phosphorylation at S637. Inhibition of Orai1 with single guide RNA (sgOrai1) or an inhibitor (BTP2) not only suppressed Drp1 activity and calmodulin-binding catalytic subunit A (CnA) and phosphorylated-extracellular signal-regulated kinase (p-ERK1/2) expression but also alleviated mitochondrial dysfunction and cardiomyocyte hypertrophy caused by HG. In addition, the CnA inhibitor cyclosporin A and p-ERK1/2 inhibitor U0126 improved HG-induced cardiomyocyte hypertrophy by promoting and inhibiting phosphorylation of Drp1 at S637 and S616, respectively. In summary, we identified Drp1 as a downstream target of Orai1-mediated Ca2+ entry, via activation by p-ERK1/2-mediated phosphorylation at S616 or CnA-mediated dephosphorylation at S637 in DCM. Thus, the Orai1–Drp1 axis is a novel target for treating DCM.

scholarly journals Mitochondrial fission process 1 (MTFP1) controls bioenergetic efficiency and prevents inflammatory cardiomyopathy and heart failure in mice

2021 ◽  
Author(s):  
Erminia Donnarumma ◽  
Michael Kohlhaas ◽  
Elodie Vimont ◽  
Etienne Kornobis ◽  
Thibaut Chaze ◽  
...  
Keyword(s):  
Gene Expression ◽  
Heart Failure ◽  
Cell Death ◽  
Knockout Mice ◽  
Mitochondrial Permeability Transition ◽  
Mitochondrial Fission ◽  
Sterile Inflammation ◽  
Mitochondrial Morphology ◽  
Fission Process ◽  
General Decline

Mitochondria are paramount to the metabolism and survival of cardiomyocytes. Here we show that Mitochondrial Fission Process 1 (MTFP1) is essential for cardiac structure and function. Constitutive knockout of cardiomyocyte MTFP1 in mice resulted in adult-onset dilated cardiomyopathy (DCM) characterized by sterile inflammation and cardiac fibrosis that progressed to heart failure and middle-aged death. Failing hearts from cardiomyocyte-restricted knockout mice displayed a general decline in mitochondrial gene expression and oxidative phosphorylation (OXPHOS) activity. Pre-DCM, we observed no defects in mitochondrial morphology, content, gene expression, OXPHOS assembly nor phosphorylation dependent respiration. However, knockout cardiac mitochondria displayed reduced membrane potential and increased non-phosphorylation dependent respiration, which could be rescued by pharmacological inhibition of the adenine nucleotide translocase ANT. Primary cardiomyocytes from pre-symptomatic knockout mice exhibited normal excitation-contraction coupling but increased sensitivity to programmed cell death (PCD), which was accompanied by an opening of the mitochondrial permeability transition pore (mPTP). Intriguingly, mouse embryonic fibroblasts deleted for Mtfp1 recapitulated PCD sensitivity and mPTP opening, both of which could be rescued by pharmacological or genetic inhibition of the mPTP regulator Cyclophilin D. Collectively, our data demonstrate that contrary to previous in vitro studies, the loss of the MTFP1 promotes mitochondrial uncoupling and increases cell death sensitivity, causally mediating pathogenic cardiac remodeling.

scholarly journals Imatinib protects against human beta-cell death via inhibition of mitochondrial respiration and activation of AMPK

2021 ◽  
Author(s):  
Andris Elksnis ◽  
Tomas A Schiffer ◽  
Fredrik Palm ◽  
Yun Wang ◽  
Jing Cen ◽  
...  
Keyword(s):  
Cell Death ◽  
Tyrosine Kinase ◽  
Beta Cell ◽  
Mitochondrial Respiration ◽  
Kinase Inhibitor ◽  
Direct Interaction ◽  
Ampk Activation ◽  
Beta Cell Death ◽  
Compound C

The protein tyrosine kinase inhibitor imatinib is used in the treatment of various malignancies, but may also promote beneficial effects in the treatment of diabetes. The aim of the present investigation was to characterize the mechanisms by which imatinib protects insulin producing cells. Treatment of NOD mice with imatinib resulted in increased beta-cell AMPK phosphorylation. Imatinib activated AMPK also in vitro, resulting in decreased ribosomal protein S6 phosphorylation and protection against IAPP-aggregation, TXNIP upregulation and beta-cell death. AICAR mimicked and compound C counteracted the effect of imatinib on beta-cell survival. Imatinib-induced AMPK activation was preceded by reduced glucose/pyruvate-dependent respiration, increased glycolysis rates, and a lowered ATP/AMP ratio. Imatinib augmented the fractional oxidation of fatty acids/malate, possibly via a direct interaction with the beta-oxidation enzyme ECHS1. In non-beta cells, imatinib reduced respiratory chain complex I and II-mediated respiration and ACC phosphorylation, suggesting that mitochondrial effects of imatinib are not beta-cell specific. In conclusion, tyrosine kinase inhibitors modestly inhibit mitochondrial respiration, leading to AMPK activation and TXNIP downregulation, which in turn protects against beta-cell death.

Abstract 24: Bnip3 Provokes ROS Production and Maladaptive Autophagy by Displacing Uncoupling Protein3 (UCP3) From Cytochrome c Oxidase of Respiration Chain Complex in Cardiotoxicity

2015 ◽  
Vol 117 (suppl_1) ◽  
Author(s):  
Rimpy Dhingra ◽  
Victoria Margulets ◽  
Davinder Jassal ◽  
Gerald Dorn II ◽  
Lorrie A. Kirshenbaum
Keyword(s):  
Cell Death ◽  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Cardiac Myocytes ◽  
Mitochondrial Function ◽  
Uncoupling Protein ◽  
Mitochondrial Morphology ◽  
Necrotic Cell Death ◽  
Ros Production ◽  
Necrotic Cell

Doxorubicin is known for its cardiotoxic effects and inducing cardiac failure, however, the underlying mechanisms remain cryptic. Earlier we established the inducible - death protein, Bcl-2-like Nineteen- Kilodalton- Interacting - Protein 3 (Bnip3) to be crucial for disrupting mitochondrial function and inducing cell death of cardiac myocytes. Whether Bnip3 underlies cardiotoxic effects of doxorubicin toxicity is unknown. Herein we demonstrate a novel signaling pathway that functionally links activation and preferential mitochondrial targeting of Bnip3 to the cardiotoxic properties of doxorubicin. Perturbations to mitochondria including increased calcium loading, ROS, loss of αΨm and mPTP opening were observed in cardiac myocytes treated with doxorubicin. In mitochondria, Bnip3 forms strong association with Cytochrome c oxidase subunit1 (COX1) of respiratory chain and displaces uncoupling protein 3 (UCP3) resulting in increased ROS production, decline in maximal and reserved respiration capacity and cell viability. Impaired mitochondrial function was accompanied by an accumulated increase in autophagosomes and necrosis demonstrated by increase release of LDH, cTnT and loss of nuclear High Mobility Group Protein 1 (HMGB-1) immunoreactivity. Interestingly, pharmacological or genetic inhibition of autophagy with 3-methyl adenine (3-MA), or Atg7 knock-down suppressed necrotic cell death induced by doxorubicin. Loss of function of Bnip3 restored UCP3-COX complexes, mitochondrial respiratory integrity and abrogated necrotic cell death induced by doxorubicin. Mice germ-line deficient for Bnip3 were resistant to doxorubicin cardiotoxicity displaying normal mitochondrial morphology, cardiac function and survival rates comparable to vehicle treated mice. The findings of the present study demonstrate that doxorubicin provokes maladaptive autophagy and necrotic cell death of ventricular myocytes that is mutually dependent and obligatorily linked to Bnip3.

scholarly journals Fzo1, a Protein Involved in Mitochondrial Fusion, Inhibits Apoptosis

2004 ◽  
Vol 279 (50) ◽  
pp. 52726-52734 ◽  
Author(s):  
Rie Sugioka ◽  
Shigeomi Shimizu ◽  
Yoshihide Tsujimoto
Keyword(s):  
Cell Death ◽  
Conformational Changes ◽  
Apoptotic Cell ◽  
Mitochondrial Fission ◽  
Apoptotic Cell Death ◽  
Mitochondrial Fusion ◽  
Mitochondrial Morphology ◽  
Human Homolog ◽  
Mitochondrial Fragmentation ◽  
Apoptotic Death

Mitochondrial morphology and physiology are regulated by the processes of fusion and fission. Some forms of apoptosis are reported to be associated with mitochondrial fragmentation. We showed that overexpression of Fzo1A/B (rat) proteins involved in mitochondrial fusion, or silencing of Dnm1 (rat)/Drp1 (human) (a mitochondrial fission protein), increased elongated mitochondria in healthy cells. After apoptotic stimulation, these interventions inhibited mitochondrial fragmentation and cell death, suggesting that a process involved in mitochondrial fusion/fission might play a role in the regulation of apoptosis. Consistently, silencing of Fzo1A/B or Mfn1/2 (a human homolog of Fzo1A/B) led to an increase of shorter mitochondria and enhanced apoptotic death. Overexpression of Fzo1 inhibited cytochromecrelease and activation of Bax/Bak, as assessed from conformational changes and oligomerization. Silencing of Mfn or Drp1 caused an increase or decrease of mitochondrial sensitivity to apoptotic stimulation, respectively. These results indicate that some of the proteins involved in mitochondrial fusion/fission modulate apoptotic cell death at the mitochondrial level.

scholarly journals Porphyromonas gingivalis infection promotes mitochondrial dysfunction through Drp1-dependent mitochondrial fission in endothelial cells

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Tong Xu ◽  
Qin Dong ◽  
Yuxiao Luo ◽  
Yanqing Liu ◽  
Liang Gao ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Mitochondrial Dysfunction ◽  
Porphyromonas Gingivalis ◽  
Vascular Endothelial Cells ◽  
Mitochondrial Fission ◽  
Mitochondrial Morphology ◽  
Mitochondrial Fragmentation ◽  
Atp Production ◽  
Luminescence Assay ◽  
The Impact

AbstractPorphyromonas gingivalis (P. gingivalis), a key pathogen in periodontitis, has been shown to accelerate the progression of atherosclerosis (AS). However, the definite mechanisms remain elusive. Emerging evidence supports an association between mitochondrial dysfunction and AS. In our study, the impact of P. gingivalis on mitochondrial dysfunction and the potential mechanism were investigated. The mitochondrial morphology of EA.hy926 cells infected with P. gingivalis was assessed by transmission electron microscopy, mitochondrial staining, and quantitative analysis of the mitochondrial network. Fluorescence staining and flow cytometry analysis were performed to determine mitochondrial reactive oxygen species (mtROS) and mitochondrial membrane potential (MMP) levels. Cellular ATP production was examined by a luminescence assay kit. The expression of key fusion and fission proteins was evaluated by western blot and immunofluorescence. Mdivi-1, a specific Drp1 inhibitor, was used to elucidate the role of Drp1 in mitochondrial dysfunction. Our findings showed that P. gingivalis infection induced mitochondrial fragmentation, increased the mtROS levels, and decreased the MMP and ATP concentration in vascular endothelial cells. We observed upregulation of Drp1 (Ser616) phosphorylation and translocation of Drp1 to mitochondria. Mdivi-1 blocked the mitochondrial fragmentation and dysfunction induced by P. gingivalis. Collectively, these results revealed that P. gingivalis infection promoted mitochondrial fragmentation and dysfunction, which was dependent on Drp1. Mitochondrial dysfunction may represent the mechanism by which P. gingivalis exacerbates atherosclerotic lesions.

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