scholarly journals Ginsenoside Re Protects against Serotonergic Behaviors Evoked by 2,5-Dimethoxy-4-iodo-amphetamine in Mice via Inhibition of PKCδ-Mediated Mitochondrial Dysfunction

2021 ◽  
Vol 22 (13) ◽  
pp. 7219
Author(s):  
Eun-Joo Shin ◽  
Ji Hoon Jeong ◽  
Bao-Trong Nguyen ◽  
Naveen Sharma ◽  
Seung-Yeol Nah ◽  
...  
Keyword(s):  
Mitochondrial Dysfunction ◽  
Serotonin Syndrome ◽  
Therapeutic Interventions ◽  
Wild Type ◽  
Mitochondrial Oxidative Stress ◽  
Ginsenoside Re ◽  
Mitochondrial Translocation ◽  
Serotonin System ◽  
Mitochondrial Glutathione ◽  
Serotonin 2A

It has been recognized that serotonin 2A receptor (5-HT2A) agonist 2,5-dimethoxy-4-iodo-amphetamine (DOI) impairs serotonergic homeostasis. However, the mechanism of DOI-induced serotonergic behaviors remains to be explored. Moreover, little is known about therapeutic interventions against serotonin syndrome, although evidence suggests that ginseng might possess modulating effects on the serotonin system. As ginsenoside Re (GRe) is well-known as a novel antioxidant in the nervous system, we investigated whether GRe modulates 5-HT2A receptor agonist DOI-induced serotonin impairments. We proposed that protein kinase Cδ (PKCδ) mediates serotonergic impairments. Treatment with GRe or 5-HT2A receptor antagonist MDL11939 significantly attenuated DOI-induced serotonergic behaviors (i.e., overall serotonergic syndrome behaviors, head twitch response, hyperthermia) by inhibiting mitochondrial translocation of PKCδ, reducing mitochondrial glutathione peroxidase activity, mitochondrial dysfunction, and mitochondrial oxidative stress in wild-type mice. These attenuations were in line with those observed upon PKCδ inhibition (i.e., pharmacologic inhibitor rottlerin or PKCδ knockout mice). Furthermore, GRe was not further implicated in attenuation mediated by PKCδ knockout in mice. Our results suggest that PKCδ is a therapeutic target for GRe against serotonergic behaviors induced by DOI.

scholarly journals ATPase Inhibitor Factor-1 Disrupts Mitochondrial Ca2+ Handling and Promotes Pathological Cardiac Hypertrophy through CaMKIIδ

2021 ◽  
Author(s):  
Mario Pavez-Giani ◽  
Pablo Sanchez-Aguilera ◽  
Nils Bomer ◽  
Shigeki Miyamoto ◽  
Paula Giraldo ◽  
...  
Keyword(s):  
Mitochondrial Dysfunction ◽  
Atp Synthase ◽  
Cardiomyocyte Hypertrophy ◽  
Wild Type ◽  
Mitochondrial Fragmentation ◽  
Atpase Inhibitor ◽  
Mitochondrial Oxidative Stress ◽  
Pathological Cardiac Hypertrophy ◽  
Pathological Hypertrophy ◽  
Metabolic Remodeling

Background : ATPase inhibitor factor-1 (IF1) preserves cellular ATP under conditions of respiratory collapse, yet the function of IF1 under normal respiring conditions is unresolved. We tested the hypothesis that IF1 promotes mitochondrial dysfunction and pathological cardiomyocyte hypertrophy in the context of heart failure (HF). Methods and results Cardiac expression of IF1 was increased in mice and in humans with HF, downstream of neurohumoral signaling pathways and in patterns that resembled the fetal-like gene program. Adenoviral expression of wild type IF1 in primary cardiomyocytes resulted in pathological hypertrophy and metabolic remodeling as evidenced by enhanced mitochondrial oxidative stress, reduced mitochondrial respiratory capacity, and the augmentation of extra-mitochondrial glycolysis. Similar perturbations were observed with an IF1 mutant incapable of binding to ATP-synthase (E55A mutation), indication that these effects occurred independent of binding to ATP synthase. Instead, IF1 promoted mitochondrial fragmentation and compromised mitochondrial Ca2+ handling, which resulted in sarcoplasmic reticulum Ca2+ overloading. The effects of IF1 on Ca2+ handling were associated with the cytosolic activation of CaMKII and inhibition of CaMKII or co-expression of catalytically dead CaMKIIδC was sufficient to prevent IF-1 induced pathological hypertrophy. Conclusions IF1 represents a novel member of the fetal-like gene program that contributes to mitochondrial dysfunction and pathological cardiac remodeling in HF. Furthermore, we present evidence for a novel, ATP-synthase independent, role for IF1 in mitochondrial Ca2+ handling and mitochondrial- to nuclear crosstalk involving CaMKII.

scholarly journals Alterations in BDNF Protein Concentrations in the Hippocampus do not Explain the Pro-Neurogenic Effect of Citalopram on Adult Neurogenesis

2020 ◽  
Author(s):  
Markus Petermann ◽  
Golo Kronenberg ◽  
Valentina Mosienko ◽  
Michael Bader ◽  
Natalia Alenina ◽  
...  
Keyword(s):  
Cell Survival ◽  
Mechanism Of Action ◽  
Adult Neurogenesis ◽  
Neurotrophic Factor ◽  
Selective Serotonin Reuptake Inhibitors ◽  
Daily Injection ◽  
Wild Type ◽  
Protein Levels ◽  
Serotonin System ◽  
Antidepressant Pharmacotherapy

Abstract Introduction Brain-derived neurotrophic factor (BDNF) has been implicated in the pro-neurogenic effect of selective serotonin reuptake inhibitors. In this study, we used Tph2 −/− mice lacking brain serotonin to dissect the interplay between BDNF and the serotonin system in mediating the effects of antidepressant pharmacotherapy on adult neurogenesis in the hippocampus. Methods Besides citalopram (CIT), we tested tianeptine (TIA), an antidepressant whose mechanism of action is not well understood. Specifically, we examined cell survival and endogenous concentrations of BDNF following daily injection of the drugs. Results Twenty-one days of CIT, but not of TIA, led to a significant increase in the survival of newly generated cells in the dentate gyrus of wild-type mice, without a significant effect on BDNF protein levels by either treatment. In Tph2 −/− mice, adult neurogenesis was consistently increased. Furthermore, Tph2 −/− mice showed increased BDNF protein levels, which were not affected by TIA but were significantly reduced by CIT. Discussion We conclude that the effects of CIT on adult neurogenesis are not explained by changes in BDNF protein concentrations in the hippocampus.

scholarly journals Adipocyte-Mineralocorticoid Receptor Alters Mitochondrial Quality Control Leading to Mitochondrial Dysfunction and Senescence of Visceral Adipose Tissue

2021 ◽  
Vol 22 (6) ◽  
pp. 2881
Author(s):  
Clara Lefranc ◽  
Malou Friederich-Persson ◽  
Fabienne Foufelle ◽  
Aurélie Nguyen Dinh Cat ◽  
Frédéric Jaisser
Keyword(s):  
Quality Control ◽  
Adipose Tissue ◽  
Mitochondrial Dysfunction ◽  
Cellular Senescence ◽  
Mineralocorticoid Receptor ◽  
Molecular Mechanisms ◽  
Mitochondrial Dynamics ◽  
Mitochondrial Quality Control ◽  
Mitochondrial Oxidative Stress ◽  
Specific Effects

Mineralocorticoid receptor (MR) expression is increased in the adipose tissue (AT) of obese patients and animals. We previously demonstrated that adipocyte-MR overexpression in mice (Adipo-MROE mice) is associated with metabolic alterations. Moreover, we showed that MR regulates mitochondrial dysfunction and cellular senescence in the visceral AT of obese db/db mice. Our hypothesis is that adipocyte-MR overactivation triggers mitochondrial dysfunction and cellular senescence, through increased mitochondrial oxidative stress (OS). Using the Adipo-MROE mice with conditional adipocyte-MR expression, we evaluated the specific effects of adipocyte-MR on global and mitochondrial OS, as well as on OS-induced damage. Mitochondrial function was assessed by high throughput respirometry. Molecular mechanisms were probed in AT focusing on mitochondrial quality control and senescence markers. Adipo-MROE mice exhibited increased mitochondrial OS and altered mitochondrial respiration, associated with reduced biogenesis and increased fission. This was associated with OS-induced DNA-damage and AT premature senescence. In conclusion, targeted adipocyte-MR overexpression leads to an imbalance in mitochondrial dynamics and regeneration, to mitochondrial dysfunction and to ageing in visceral AT. These data bring new insights into the MR-dependent AT dysfunction in obesity.

scholarly journals Mitochondrial Dysfunction in Atrial Fibrillation—Mechanisms and Pharmacological Interventions

2021 ◽  
Vol 10 (11) ◽  
pp. 2385
Author(s):  
Paweł Muszyński ◽  
Tomasz A. Bonda
Keyword(s):  
Atrial Fibrillation ◽  
Mitochondrial Dysfunction ◽  
Treatment Options ◽  
Therapeutic Interventions ◽  
Energy Deficit ◽  
Functional Changes ◽  
Electrical Instability ◽  
Ionic Fluxes ◽  
Prevention Methods ◽  
Invasive Techniques

Despite the enormous progress in the treatment of atrial fibrillation, mainly with the use of invasive techniques, many questions remain unanswered regarding the pathomechanism of the arrhythmia and its prevention methods. The development of atrial fibrillation requires functional changes in the myocardium that result from disturbed ionic fluxes and altered electrophysiology of the cardiomyocyte. Electrical instability and electrical remodeling underlying the arrhythmia may result from a cellular energy deficit and oxidative stress, which are caused by mitochondrial dysfunction. The significance of mitochondrial dysfunction in the pathogenesis of atrial fibrillation remains not fully elucidated; however, it is emphasized by the reduction of atrial fibrillation burden after therapeutic interventions improving the mitochondrial welfare. This review summarizes the mechanisms of mitochondrial dysfunction related to atrial fibrillation and current pharmacological treatment options targeting mitochondria to prevent or improve the outcome of atrial fibrillation.

scholarly journals Targeting Mitochondria as Therapeutic Strategy for Metabolic Disorders

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Daniela Sorriento ◽  
Antonietta Valeria Pascale ◽  
Rosa Finelli ◽  
Anna Lisa Carillo ◽  
Roberto Annunziata ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
Mitochondrial Dysfunction ◽  
Small Molecules ◽  
Metabolic Disorders ◽  
Therapeutic Strategy ◽  
Cell Metabolism ◽  
Therapeutic Interventions ◽  
Mtdna Mutations ◽  
Pathological Conditions ◽  
Mitochondria Targeting

Mitochondria are critical regulator of cell metabolism; thus, mitochondrial dysfunction is associated with many metabolic disorders. Defects in oxidative phosphorylation, ROS production, or mtDNA mutations are the main causes of mitochondrial dysfunction in many pathological conditions such as IR/diabetes, metabolic syndrome, cardiovascular diseases, and cancer. Thus, targeting mitochondria has been proposed as therapeutic approach for these conditions, leading to the development of small molecules to be tested in the clinical scenario. Here we discuss therapeutic interventions to treat mitochondrial dysfunction associated with two major metabolic disorders, metabolic syndrome, and cancer. Finally, novel mechanisms of regulation of mitochondrial function are discussed, which open new scenarios for mitochondria targeting.

Withanone Ameliorates Stress Symptoms in Caenorhabditis Elegans by Acting through Serotonin Receptors

2021 ◽  
Author(s):  
Janine Naß ◽  
Thomas Efferth
Keyword(s):  
Caenorhabditis Elegans ◽  
In Silico ◽  
Serotonin Receptors ◽  
New Drugs ◽  
Potential Candidate ◽  
Human Beings ◽  
Wild Type ◽  
C Elegans ◽  
Stress Symptoms ◽  
Serotonin System

Abstract Introduction Depression is responsible for 800 000 deaths worldwide, a number that will rise significantly due to the COVID-19 pandemic. Affordable novel drugs with less severe side effects are urgently required. We investigated the effect of withanone (WN) from Withania somnifera on the serotonin system of wild-type and knockout Caenorhabditis elegans strains using in silico, in vitro, and in vivo methods. Methods WN or fluoxetine (as positive control drug) was administered to wild-type (N2) and knockout C. elegans strains (AQ866, DA1814, DA2100, DA2109, and MT9772) to determine their effect on oxidative stress (Trolox, H2DCFDA, and juglone assays) on osmotic stress and heat stress and lifespan. Quantitative real-time RT-PCR was applied to investigate the effect of WN or fluoxetine on the expression of serotonin receptors (ser-1, ser-4, ser-7) and serotonin transporter (mod-5). The binding affinity of WN to serotonin receptors and transporter was analyzed in silico using AutoDock 4.2.6. Results WN scavenged ROS in wild-type and knockout C. elegans and prolonged their lifespan. WN upregulated the expression of serotonin receptor and transporter genes. In silico analyses revealed high binding affinities of WN to Ser-1, Ser-4, Ser-7, and Mod-5. Limitations Further studies are needed to prove whether the results from C. elegans are transferrable to mammals and human beings. Conclusion WN ameliorated depressive-associated stress symptoms by activating the serotonin system. WN may serve as potential candidate in developing new drugs to treat depression.

Abstract P074: Mitochondrial Isolevuglandins Contribute To Vascular Oxidative Stress And Mitochondria-targeted Scavenger Of Isolevuglandins Reduces Mitochondrial Dysfunction And Hypertension

Hypertension ◽  
2020 ◽  
Vol 76 (Suppl_1) ◽  
Author(s):  
Anna Dikalova ◽  
Vladimir Mayorov ◽  
Liang Xiao ◽  
Alexander Panov ◽  
Venkataraman Amarnath ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Angiotensin Ii ◽  
Mitochondrial Dysfunction ◽  
Vascular Function ◽  
Therapeutic Potential ◽  
Protein Adducts ◽  
Specific Marker ◽  
Mitochondrial Oxidative Stress ◽  
Major Health Problem ◽  
Multiple Drugs

Hypertension remains a major health problem in Western Societies, and blood pressure is poorly controlled in a third of patients despite use of multiple drugs. Mitochondrial dysfunction contributes to hypertension and mitochondria-targeted agents can potentially improve treatment of hypertension. We have proposed that mitochondrial oxidative stress produces reactive dicarbonyl lipid peroxidation products isolevuglandins (isoLGs) and that scavenging of mitochondrial isoLG improves vascular function and reduces hypertension. To test this hypothesis, we have studied the accumulation of mitochondrial isoLG-protein adducts in human patients with essential hypertension and angiotensin II mouse model of hypertension using mass spectrometry and Western blot analysis. The therapeutic potential of targeting mitochondrial isoLG was tested by the novel mitochondria-targeted isoLG scavenger, mito2HOBA. Mitochondrial isoLG in arterioles isolated from hypertensive patients were 250% greater than in arterioles from normotensive subjects, and ex vivo mito2HOBA treatment of arterioles from hypertensive subjects improved deacetylation of a key mitochondrial antioxidant, superoxide dismutase 2 (SOD2). In human aortic endothelial cells, mito2HOBA diminished mitochondrial superoxide and inhibited cardiolipin oxidation, a specific marker of mitochondrial oxidative stress. In angiotensin II-infused mice, mito2HOBA prevented accumulation of mitochondrial isoLG-protein adducts, improved Sirt3 mitochondrial deacetylase activity, reduced vascular superoxide, increased endothelial nitric oxide, improved endothelium-dependent relaxation, and attenuated hypertension. Mito2HOBA preserved mitochondrial respiration, protected ATP production, and reduced mitochondrial permeability pore opening in angiotensin II-infused mice. These data support the role of mitochondrial isoLGs in endothelial dysfunction and hypertension. We conclude that scavenging of mitochondrial isoLGs may have therapeutic potential in treatment of vascular dysfunction and hypertension.

scholarly journals Stretching magnitude–dependent inactivation of AKT by ROS led to enhanced p53 mitochondrial translocation and myoblast apoptosis

2019 ◽  
Vol 30 (10) ◽  
pp. 1182-1197 ◽  
Author(s):  
Jing Song ◽  
Yaqi Wang ◽  
Xiao Yuan ◽  
Qiuxia Ji ◽  
Cunhui Fan ◽  
...  
Keyword(s):  
P53 Protein ◽  
Akt Pathway ◽  
Ros Generation ◽  
C2c12 Myoblast ◽  
Wild Type ◽  
Nuclear Targeting ◽  
Mitochondrial Translocation ◽  
Dependent Inactivation ◽  
Mitochondrial Trafficking ◽  
Induced Apoptosis

Previously, we had shown that high magnitude stretch (HMS), rather than low magnitude stretch (LMS), induced significant apoptosis of skeletal muscle C2C12 myoblasts. However, the molecular mechanism remains obscure. In this study, we found that p53 protein accumulated in the nucleus of LMS-loaded cells, whereas it translocated into mitochondria of HMS-loaded cells. Knocking down endogenous p53 by shRNA abrogated HMS-induced apoptosis. Furthermore, we demonstrated that overaccumulation of reactive oxygen species (ROS) during HMS-inactivated AKT that was activated in LMS-treated cells, which accounted for the distinct p53 subcellular localizations under HMS and LMS. Blocking ROS generation by N-acetylcysteine (NAC) or overexpressing constitutively active AKT vector (CA-AKT) inhibited HMS-incurred p53 mitochondrial translocation and promoted its nuclear targeting. Moreover, both NAC and CA-AKT significantly attenuated HMS-induced C2C12 apoptosis. Finally, we found that Ser389 phosphorylation of p53 was a downstream event of ROS-inactivated AKT pathway, which was critical to p53 mitochondrial trafficking during HMS stimuli. Transfecting p53-shRNA C2C12s with the mutant p53 (S389A) that was unable to target p53 to mitochondria underwent significantly lower apoptosis than transfection with wild-type p53. Altogether, our study uncovered that mitochondrial localization of p53, resulting from p53 Ser389 phosphorylation through ROS-inactivated AKT pathway, prompted C2C12 myoblast apoptosis during HMS stimulation.

scholarly journals Tobacco smoking induces cardiovascular mitochondrial oxidative stress, promotes endothelial dysfunction, and enhances hypertension

2019 ◽  
Vol 316 (3) ◽  
pp. H639-H646 ◽  
Author(s):  
Sergey Dikalov ◽  
Hana Itani ◽  
Bradley Richmond ◽  
Liaison Arslanbaeva ◽  
Aurelia Vergeade ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Angiotensin Ii ◽  
Endothelial Dysfunction ◽  
Cigarette Smoke ◽  
Tobacco Smoke ◽  
Tobacco Smoking ◽  
Smoke Exposure ◽  
Metabolic Reprogramming ◽  
Wild Type ◽  
Mitochondrial Oxidative Stress

Tobacco smoking is a major risk factor for cardiovascular disease and hypertension. It is associated with the oxidative stress and induces metabolic reprogramming, altering mitochondrial function. We hypothesized that cigarette smoke induces cardiovascular mitochondrial oxidative stress, which contributes to endothelial dysfunction and hypertension. To test this hypothesis, we studied whether the scavenging of mitochondrial H2O2 in transgenic mice expressing mitochondria-targeted catalase (mCAT) attenuates the development of cigarette smoke/angiotensin II-induced mitochondrial oxidative stress and hypertension compared with wild-type mice. Two weeks of exposure of wild-type mice with cigarette smoke increased systolic blood pressure by 17 mmHg, which was similar to the effect of a subpresssor dose of angiotensin II (0.2 mg·kg−1·day−1), leading to a moderate increase to the prehypertensive level. Cigarette smoke exposure and a low dose of angiotensin II cooperatively induced severe hypertension in wild-type mice, but the scavenging of mitochondrial H2O2 in mCAT mice completely prevented the development of hypertension. Cigarette smoke and angiotensin II cooperatively induced oxidation of cardiolipin (a specific biomarker of mitochondrial oxidative stress) in wild-type mice, which was abolished in mCAT mice. Cigarette smoke and angiotensin II impaired endothelium-dependent relaxation and induced superoxide overproduction, which was diminished in mCAT mice. To mimic the tobacco smoke exposure, we used cigarette smoke condensate, which induced mitochondrial superoxide overproduction and reduced endothelial nitric oxide (a hallmark of endothelial dysfunction in hypertension). Western blot experiments indicated that tobacco smoke and angiotensin II reduce the mitochondrial deacetylase sirtuin-3 level and cause hyperacetylation of a key mitochondrial antioxidant, SOD2, which promotes mitochondrial oxidative stress. NEW & NOTEWORTHY This work demonstrates tobacco smoking-induced mitochondrial oxidative stress, which contributes to endothelial dysfunction and development of hypertension. We suggest that the targeting of mitochondrial oxidative stress can be beneficial for treatment of pathological conditions associated with tobacco smoking, such as endothelial dysfunction, hypertension, and cardiovascular diseases. Listen to this article’s corresponding podcast at https://ajpheart.podbean.com/e/mitochondrial-oxidative-stress-in-smoking-and-hypertension/ .

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