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da Silva S, da Costa CDL, Naime AA, Santos DB, Farina M, Colle D. Mechanisms Mediating the Combined Toxicity of Paraquat and Maneb in SH-SY5Y Neuroblastoma Cells. Chem Res Toxicol 2024. [PMID: 39058280 DOI: 10.1021/acs.chemrestox.3c00389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2024]
Abstract
Epidemiological and experimental studies have demonstrated that combined exposure to the pesticides paraquat (PQ) and maneb (MB) increases the risk of developing Parkinson's disease. However, the mechanisms mediating the toxicity induced by combined exposure to these pesticides are not well understood. The aim of this study was to investigate the mechanism(s) of neurotoxicity induced by exposure to the pesticides PQ and MB isolated or in association (PQ + MB) in SH-SY5Y neuroblastoma cells. PQ + MB exposure for 24 and 48 h decreased cell viability and disrupted cell membrane integrity. In addition, PQ + MB exposure for 12 h decreased the mitochondrial membrane potential. PQ alone increased reactive oxygen species (ROS) and superoxide anion generation and decreased the activity of mitochondrial complexes I and II at 12 h of exposure. MB alone increased ROS generation and depleted intracellular glutathione (GSH) within 6 h of exposure. In contrast, MB exposure for 12 h increased the GSH levels, the glutamate cysteine ligase (GCL, the rate-limiting enzyme in the GSH synthesis pathway) activity, and increased nuclear Nrf2 staining. Pretreatment with buthionine sulfoximine (BSO, a GCL inhibitor) abolished the MB-mediated GSH increase, indicating that MB increases GSH synthesis by upregulating GCL, probably by the activation of the Nrf2/ARE pathway. BSO pretreatment, which did not modify cell viability per se, rendered cells more sensitive to MB-induced toxicity. In contrast, treatment with the antioxidant N-acetylcysteine protected cells from MB-induced toxicity. These findings show that the combined exposure of SH-SY5Y cells to PQ and MB induced a cytotoxic effect higher than that observed when cells were subjected to individual exposures. Such a higher effect seems to be related to additive toxic events resulting from PQ and MB exposures. Thus, our study contributes to a better understanding of the toxicity of PQ and MB in combined exposures.
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Affiliation(s)
- Suzana da Silva
- Department of Clinical Analyses, Federal University of Santa Catarina, Florianopolis 88040-900 Santa Catarina, Brazil
| | - Carolina de Lima da Costa
- Department of Clinical Analyses, Federal University of Santa Catarina, Florianopolis 88040-900 Santa Catarina, Brazil
| | - Aline Aita Naime
- Department of Biochemistry, Federal University of Santa Catarina, Florianopolis 88040-900 Santa Catarina, Brazil
| | - Danúbia Bonfanti Santos
- Department of Biochemistry, Federal University of Santa Catarina, Florianopolis 88040-900 Santa Catarina, Brazil
| | - Marcelo Farina
- Department of Biochemistry, Federal University of Santa Catarina, Florianopolis 88040-900 Santa Catarina, Brazil
| | - Dirleise Colle
- Department of Clinical Analyses, Federal University of Santa Catarina, Florianopolis 88040-900 Santa Catarina, Brazil
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2
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Kulkarni N, Gadde R, Betharia S. Dithiolethiones D3T and ACDT Protect Against Iron Overload-Induced Cytotoxicity and Serve as Ferroptosis Inhibitors in U-87 MG Cells. Neurochem Res 2023:10.1007/s11064-023-03927-7. [PMID: 37061657 DOI: 10.1007/s11064-023-03927-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 03/27/2023] [Accepted: 03/31/2023] [Indexed: 04/17/2023]
Abstract
Iron overload-induced oxidative stress is implicated in various neurodegenerative disorders. Given the numerous adverse effects associated with current iron chelators, natural antioxidants are being explored as alternative therapeutic options. Dithiolethiones found in cruciferous vegetables have emerged as promising candidates against a wide range of toxicants owing to their lipophilic and cytoprotective properties. Here, we test the dithiolethiones 3H-1,2-dithiole-3-thione (D3T) and 5-amino-3-thioxo-3H-(1,2) dithiole-4-carboxylic acid ethyl ester (ACDT) against ferric ammonium citrate (FAC)-induced toxicity in U-87 MG astrocytoma cells. Exposure to 15 mM FAC for 24 h resulted in 54% cell death. A 24-h pretreatment with 50 μM D3T and ACDT prevented this cytotoxicity. Both dithiolethiones exhibited antioxidant effects by activating the nuclear factor erythroid 2-related factor-2 (Nrf2) transcription factor and upregulating levels of intracellular glutathione (GSH). This resulted in the successful inhibition of FAC-induced reactive oxygen species, lipid peroxidation, and cell death. Additionally, D3T and ACDT upregulated expression of the Nrf2-mediated iron storage protein ferritin which consequently reduced the total labile iron pool. A 24-h pretreatment with D3T and ACDT also prevented cell death induced by the ferroptosis inducer erastin by upregulating the transmembrane cystine/glutamate antiporter (xCT) expression. The resulting increase in intracellular GSH and alleviation of lipid peroxidation was comparable to that caused by ferrostatin-1, a specific ferroptosis inhibitor. Collectively, our findings demonstrate that dithiolethiones may show promise as potential therapeutic options for the treatment of iron overload disorders.
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Affiliation(s)
- Neha Kulkarni
- Department of Pharmaceutical Sciences, School of Pharmacy, Massachusetts College of Pharmacy and Health Sciences, 179 Longwood Avenue, Boston, MA, 02115, USA
| | - Rajitha Gadde
- Department of Pharmaceutical Sciences, School of Pharmacy, Massachusetts College of Pharmacy and Health Sciences, 179 Longwood Avenue, Boston, MA, 02115, USA
| | - Swati Betharia
- Department of Pharmaceutical Sciences, School of Pharmacy, Massachusetts College of Pharmacy and Health Sciences, 179 Longwood Avenue, Boston, MA, 02115, USA.
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3
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Song ZL, Zhao L, Ma T, Osama A, Shen T, He Y, Fang J. Progress and perspective on hydrogen sulfide donors and their biomedical applications. Med Res Rev 2022; 42:1930-1977. [PMID: 35657029 DOI: 10.1002/med.21913] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 05/18/2022] [Accepted: 05/23/2022] [Indexed: 12/22/2022]
Abstract
Following the discovery of nitric oxide (NO) and carbon monoxide (CO), hydrogen sulfide (H2 S) has been identified as the third gasotransmitter in humans. Increasing evidence have shown that H2 S is of preventive or therapeutic effects on diverse pathological complications. As a consequence, it is of great significance to develop suitable approaches of H2 S-based therapeutics for biomedical applications. H2 S-releasing agents (H2 S donors) play important roles in exploring and understanding the physiological functions of H2 S. More importantly, accumulating studies have validated the theranostic potential of H2 S donors in extensive repertoires of in vitro and in vivo disease models. Thus, it is imperative to summarize and update the literatures in this field. In this review, first, the background of H2 S on its chemical and biological aspects is concisely introduced. Second, the studies regarding the H2 S-releasing compounds are categorized and described, and accordingly, their H2 S-donating mechanisms, biological applications, and therapeutic values are also comprehensively delineated and discussed. Necessary comparisons between related H2 S donors are presented, and the drawbacks of many typical H2 S donors are analyzed and revealed. Finally, several critical challenges encountered in the development of multifunctional H2 S donors are discussed, and the direction of their future development as well as their biomedical applications is proposed. We expect that this review will reach extensive audiences across multiple disciplines and promote the innovation of H2 S biomedicine.
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Affiliation(s)
- Zi-Long Song
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China.,Botanical Agrochemicals Research & Development Center, Lanzhou Jiaotong University, Lanzhou, Gansu, China
| | - Lanning Zhao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China.,School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
| | - Tao Ma
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China
| | - Alsiddig Osama
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China
| | - Tong Shen
- Botanical Agrochemicals Research & Development Center, Lanzhou Jiaotong University, Lanzhou, Gansu, China
| | - Yilin He
- Botanical Agrochemicals Research & Development Center, Lanzhou Jiaotong University, Lanzhou, Gansu, China
| | - Jianguo Fang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China.,School of Chemistry and Chemical Engineering, Nanjing University of Science & Technology, Nanjing, China
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Zhang J, Duan D, Song ZL, Liu T, Hou Y, Fang J. Small molecules regulating reactive oxygen species homeostasis for cancer therapy. Med Res Rev 2020; 41:342-394. [PMID: 32981100 DOI: 10.1002/med.21734] [Citation(s) in RCA: 87] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 07/27/2020] [Accepted: 08/22/2020] [Indexed: 12/13/2022]
Abstract
Elevated intracellular reactive oxygen species (ROS) and antioxidant defense systems have been recognized as one of the hallmarks of cancer cells. Compared with normal cells, cancer cells exhibit increased ROS to maintain their malignant phenotypes and are more dependent on the "redox adaptation" mechanism. Thus, there are two apparently contradictory but virtually complementary therapeutic strategies for the regulation of ROS to prevent or treat cancer. The first strategy, that is, chemoprevention, is to prevent or reduce intracellular ROS either by suppressing ROS production pathways or by employing antioxidants to enhance ROS clearance, which protects normal cells from malignant transformation and inhibits the early stage of tumorigenesis. The second strategy is the ROS-mediated anticancer therapy, which stimulates intracellular ROS to a toxicity threshold to activate ROS-induced cell death pathways. Therefore, targeting the regulation of intracellular ROS-related pathways by small-molecule candidates is considered to be a promising treatment for tumors. We herein first briefly introduce the source and regulation of ROS, and then focus on small molecules that regulate ROS-related pathways and show efficacy in cancer therapy from the perspective of pharmacophores. Finally, we discuss several challenges in developing cancer therapeutic agents based on ROS regulation and propose the direction of future development.
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Affiliation(s)
- Junmin Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, and School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Dongzhu Duan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, and School of Pharmacy, Lanzhou University, Lanzhou, China.,Shaanxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji, China
| | - Zi-Long Song
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, and School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Tianyu Liu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, and School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Yanan Hou
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, and School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Jianguo Fang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, and School of Pharmacy, Lanzhou University, Lanzhou, China
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Wang L, Wang M, Hu J, Shen W, Hu J, Yao Y, Wang X, Afzal CM, Ma R, Li G. Protective effect of 3H-1, 2-dithiole-3-thione on cellular model of Alzheimer's disease involves Nrf2/ARE signaling pathway. Eur J Pharmacol 2016; 795:115-123. [PMID: 27939991 DOI: 10.1016/j.ejphar.2016.12.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/05/2016] [Accepted: 12/07/2016] [Indexed: 10/20/2022]
Abstract
Nuclear factor erythroid 2-related factor 2 (Nrf2) is a major regulator for a battery of genes encoding detoxifying and antioxidative enzymes. 3H-1, 2-dithiole-3-thione (D3T), a potent free radical scavenger, is able to activate Nrf2 signaling pathway. In the present study, N2a/APPswe cells were used as the Alzheimer's disease (AD) cellular model and we investigated the protective effect of D3T on N2a/APPswe cells and the potential mechanisms. Our assays demonstrated that D3T was able to attenuate reactive oxygen species generation, increase MMP level as well as decrease MDA content. Furthermore, treatment of the cells with 40μM D3T for 24h, showed significant suppression of Aβ level in N2a/APPswe cells. The current study also found that D3T significantly upregulated the Nrf2 mRNA level and protein expression, and subsequently enhanced mRNA expression of HO-1 and NQO1 in N2a/APPswe cells. Meanwhile, down-regulation of Nrf2 by small interference RNA abolished cytoprotection of D3T. Taken together, these results demonstrate that D3T provides neuroprotection in vitro model and therefore may be a potential complement for AD therapy.
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Affiliation(s)
- Lan Wang
- Department of Neurology, Puai Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430033, China
| | - Min Wang
- Department of Neurology, Puai Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430033, China; Department of Neurology, Union Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430022, China
| | - Jing Hu
- Department of Neurology, Huaihe Hospital, Henan University, Kaifeng 47500, China
| | - Wei Shen
- Department of Neurology, Puai Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430033, China
| | - Junjie Hu
- Department of Neurology, Union Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430022, China
| | - Yi Yao
- Department of Neurology, Union Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430022, China
| | - Xifeng Wang
- Department of Neurology, Puai Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430033, China
| | - Curimbacus M Afzal
- Department of Neurology, Union Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430022, China
| | - Rong Ma
- Department of Pharmacology, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430030, China
| | - Gang Li
- Department of Neurology, Union Hospital, Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430022, China.
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Colle D, Santos DB, Hartwig JM, Godoi M, Engel DF, de Bem AF, Braga AL, Farina M. Succinobucol, a Lipid-Lowering Drug, Protects Against 3-Nitropropionic Acid-Induced Mitochondrial Dysfunction and Oxidative Stress in SH-SY5Y Cells via Upregulation of Glutathione Levels and Glutamate Cysteine Ligase Activity. Mol Neurobiol 2015; 53:1280-1295. [DOI: 10.1007/s12035-014-9086-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 12/29/2014] [Indexed: 12/23/2022]
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7
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Synthesis and structure-activity relationships study of dithiolethiones as inducers of glutathione in the SH-SY5Y neuroblastoma cell line. Bioorg Med Chem Lett 2014; 24:5829-5831. [PMID: 25455499 DOI: 10.1016/j.bmcl.2014.10.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 09/26/2014] [Accepted: 10/01/2014] [Indexed: 11/24/2022]
Abstract
Parkinson's disease is a neurodegenerative disorder that involves the degeneration of nigrostriatal dopaminergic neurons. Elevated levels of reactive oxygen species have been shown to deplete cellular levels of the ubiquitous antioxidant glutathione, leading to oxidative stress and eventual neuronal cell death. Dithiolethiones, a class of sulfur-containing heterocyclic molecules, have been shown to induce cellular production of glutathione in a variety of tissues, but have not been extensively evaluated in neurons. Herein, we report the synthesis and preliminary structure-activity relationships study of several substituted dithiolethiones. Three molecules were identified (D3T, CPDT, and 2d) that potently induced cellular glutathione in the SH-SY5Y neuroblastoma cell line. Furthermore, these compounds were found to provide neuroprotection in the 6-hydroxydopamine model of neurotoxicity. This study suggests that dithiolethione-mediated neuroprotection may have potential as a disease-modifying antiparkinsonian therapy.
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Xu M, Chen X, Gu Y, Peng T, Yang D, Chang RCC, So KF, Liu K, Shen J. Baicalin can scavenge peroxynitrite and ameliorate endogenous peroxynitrite-mediated neurotoxicity in cerebral ischemia-reperfusion injury. JOURNAL OF ETHNOPHARMACOLOGY 2013; 150:116-124. [PMID: 23973788 DOI: 10.1016/j.jep.2013.08.020] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 07/25/2013] [Accepted: 08/06/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Baicalin is one of the principal flavonoids isolated from the dried root of Scutellaria baicalensis Georgi that has long been used to treat ischemic stroke. However, its neuroprotective mechanisms against cerebral ischemia injury are poorly understood. AIM OF THE STUDY To explore the neuroprotective mechanisms of baicalin against cerebral ischemia reperfusion injury. MATERIAL AND METHODS In chemical systems, we conducted electron paramagnetic resonance (EPR) spin trapping experiments to evaluate the scavenging effects of baicalin on superoxide and nitric oxide, and mass spectrometry (MS) studies on the reaction of baicalin and peroxynitrite. In cellular experiments, we investigated the effects of baicalin against extraneous and endogenous peroxynitrite mediated neurotoxicity in SH-SY5Y cells treated with peroxynitrite donor, synthesized peroxynitrite and exposed to oxygen glucose deprivation and reoxygenation (OGD/RO) in vitro. Moreover, we studied the neuroprotective effects of baicalin by using a rat model of middle cerebral artery occlusion in vivo. FeTMPyP, a peroxynitrite decomposition catalyst, was used as positive control. Cell viability and apoptotic cell death was accessed by MTT assay and TUNEL assay respectively; 3-nitrotyrosine formation and infarction volume were detected by immunostaining experiments and TTC staining respectively. RESULTS Baicalin revealed strong antioxidant ability by directly scavenging superoxide and reacting with peroxynitrite. Baicalin protected the neuronal cells from extraneous and endogenous peroxynitrite-induced neurotoxicity. In ischemia-reperfused brains, baicalin inhibited the formation of 3-nitrotyrosine, reduced infarct size and attenuated apoptotic cell death, whose effects were similar to FeTMPyP. CONCLUSIONS Baicalin can directly scavenge peroxynitrite and the peroxynitrite-scavenging ability contributes to its neuroprotective mechanisms against cerebral ischemia reperfusion injury.
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Affiliation(s)
- Mingjing Xu
- School of Chinese Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 10 Sassoon Road, Hong Kong SAR, China; Research Centre of Heart, Brain, Hormone & Healthy Aging, The University of Hong Kong, 21 Sassoon Road, Hong Kong SAR, China.
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Ferreira PS, Nogueira TB, Costa VM, Branco PS, Ferreira LM, Fernandes E, Bastos ML, Meisel A, Carvalho F, Capela JP. Neurotoxicity of “ecstasy” and its metabolites in human dopaminergic differentiated SH-SY5Y cells. Toxicol Lett 2013. [PMID: 23194825 DOI: 10.1016/j.toxlet.2012.11.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Cuperus R, van Kuilenburg ABP, Leen R, Bras J, Caron HN, Tytgat GAM. Promising effects of the 4HPR-BSO combination in neuroblastoma monolayers and spheroids. Free Radic Biol Med 2011; 51:1213-20. [PMID: 21741474 DOI: 10.1016/j.freeradbiomed.2011.06.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 05/25/2011] [Accepted: 06/09/2011] [Indexed: 11/21/2022]
Abstract
To enhance the efficacy of fenretinide (4HPR)-induced reactive oxygen species (ROS) in neuroblastoma, 4HPR was combined with buthionine sulfoximine (BSO), an inhibitor of glutathione (GSH) synthesis, in neuroblastoma cell lines and spheroids, the latter being a three-dimensional tumor model. 4HPR exposure (2.5-10 μM, 24 h) resulted in ROS induction (114-633%) and increased GSH levels (68-120%). A GSH depletion of 80% of basal levels was observed in the presence of BSO (25-100 μM, 24 h). The 4HPR-BSO combination resulted in slightly increased ROS levels (1.1- to 1.3-fold) accompanied by an increase in cytotoxicity (110-150%) compared to 4HPR treatment alone. A correlation was observed between the ROS-inducing capacity of each cell line and the increase in cytotoxicity induced by 4HPR-BSO compared to 4HPR. No significant correlation between baseline antioxidant levels and sensitivity to 4HPR or BSO was observed. In spheroids, 4HPR-BSO induced a strong synergistic growth retardation and induction of apoptosis. Our data show that BSO increased the cytotoxic effects of 4HPR in neuroblastoma monolayers and spheroids in ROS-producing cell lines. This indicates that the 4HPR-BSO combination might be a promising new strategy in the treatment of neuroblastoma.
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Affiliation(s)
- Roos Cuperus
- Laboratory of Genetic Metabolic Diseases and Department of Pediatrics/Emma Children's Hospital, Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam, The Netherlands
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Liu XY, Li CY, Bu H, Li Z, Li B, Sun MM, Zhang L, Tian M, Fan ZL, Ren WB. Neuroprotective effect of CPDT on THA-induced cortical motor neuron death in an organotypic culture model. Brain Res Bull 2010; 83:345-50. [PMID: 20851746 DOI: 10.1016/j.brainresbull.2010.09.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Revised: 08/03/2010] [Accepted: 09/02/2010] [Indexed: 10/19/2022]
Abstract
Brain stroke, trauma, and motor neuron disease each can result in cortical motoneuron (CMN) death or impairment. Glutamate excitotoxicity induces motor neuron damage in both acute motor neuron loss and chronic motor neuron degeneration. It is necessary to find effective strategies to protect CMNs from excitotoxicity in a variety of pathological conditions. 5,6-Dihydrocyclopenta-1,2-dithiole-3-thione (CPDT) is one of the phase II enzyme inducers. In our previous report, CPDT was shown to have neuroprotective effects on the spinal cord, by activating the Nrf2/ARE pathway to increase antioxidative capacity. In this study, in order to figure out whether CPDT can prevent CMN's from THA-induced death, we set up an organotypic brain slice culture system. Threo-hydroxyaspartate (THA), a glutamate transport inhibitor, was added to the culture medium to induce CMN death by glutamate excitotoxicity. Brain slices were pretreated with CPDT for 48h, then treated with CPDT and THA simultaneously for 3 weeks. We found that pretreatment with CPDT significantly increased CMN survival. Glutamate concentration in the culture medium was significantly greater following THA treatment, whereas no significant decrease was found in the CPDT pretreatment group. However, both Nrf2 and HO-1 protein expression was significantly elevated in the CPDT pretreatment group, and Nrf2 protein translocated to the nucleus after CPDT stimulation. These findings suggest that CPDT can protect CMNs from THA-induced motor neuron death by activating the Nrf2 pathway and increasing HO-1 protein expression. Therefore, increasing antioxidative defense capacity should benefit to upper motor neuron survival following a glutamate excitotoxicity insult.
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Affiliation(s)
- Xiao-Yun Liu
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang City, Hebei Province 05000, China
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12
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Chen H, Zhou L, Lin CY, Beattie MC, Liu J, Zirkin BR. Effect of glutathione redox state on Leydig cell susceptibility to acute oxidative stress. Mol Cell Endocrinol 2010; 323:147-54. [PMID: 20206230 PMCID: PMC2875365 DOI: 10.1016/j.mce.2010.02.034] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2009] [Revised: 02/24/2010] [Accepted: 02/24/2010] [Indexed: 12/16/2022]
Abstract
The free radical, or oxidative stress, theory posits that imbalance in cells between prooxidants and antioxidants results in an altered redox state and, over time, an accumulation of oxidative damage. We hypothesized herein that cells with an increasingly prooxidant intracellular environment also might be particularly susceptible to acute oxidative stress. To test this hypothesis, MA-10 cells were used as a model because of their well-defined, measurable function, namely progesterone production. We first experimentally altered the redox environment of the cells by their incubation with buthionine sulfoximine (BSO) or diethyl maleate (DEM) so as to deplete glutathione (GSH), and then exposed the GSH-depleted cells acutely to the prooxidant tert-butyl hydroperoxide (t-BuOOH). Neither BSO nor DEM by themselves affected progesterone production. However, when the GSH-depleted cells subsequently were exposed acutely to t-BuOOH, intracellular reactive oxygen species concentration was significantly increased, and this was accompanied by significant reductions in progesterone production. In striking contrast, treatment of control cells with t-BuOOH had no effect. Depletion of GSH and subsequent treatment of the cells with t-BuOOH-induced the phosphorylation of each of ERK1/2, JNK and p38, members of the MAPK family. Inhibition of p38 phosphorylation largely prevented the t-BuOOH-induced down-regulation of progesterone production in GSH-depleted cells. These results suggest that, as hypothesized, alteration of the intracellular GSH redox environment results in the increased sensitivity of MA-10 cells to oxidative stress, and that this is mediated by activation of one or more redox-sensitive MAPK members.
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Affiliation(s)
- Haolin Chen
- Division of Reproductive Biology, Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, Baltimore, MD 21205, USA.
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13
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Landegren T, Risling M, Persson J, Sondén A. Cyanoacrylate in nerve repair: transient cytotoxic effect. Int J Oral Maxillofac Surg 2010; 39:705-12. [DOI: 10.1016/j.ijom.2010.03.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2009] [Revised: 12/29/2009] [Accepted: 03/16/2010] [Indexed: 10/19/2022]
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14
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James SJ, Rose S, Melnyk S, Jernigan S, Blossom S, Pavliv O, Gaylor DW. Cellular and mitochondrial glutathione redox imbalance in lymphoblastoid cells derived from children with autism. FASEB J 2009; 23:2374-83. [PMID: 19307255 DOI: 10.1096/fj.08-128926] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Research into the metabolic phenotype of autism has been relatively unexplored despite the fact that metabolic abnormalities have been implicated in the pathophysiology of several other neurobehavioral disorders. Plasma biomarkers of oxidative stress have been reported in autistic children; however, intracellular redox status has not yet been evaluated. Lymphoblastoid cells (LCLs) derived from autistic children and unaffected controls were used to assess relative concentrations of reduced glutathione (GSH) and oxidized disulfide glutathione (GSSG) in cell extracts and isolated mitochondria as a measure of intracellular redox capacity. The results indicated that the GSH/GSSG redox ratio was decreased and percentage oxidized glutathione increased in both cytosol and mitochondria in the autism LCLs. Exposure to oxidative stress via the sulfhydryl reagent thimerosal resulted in a greater decrease in the GSH/GSSG ratio and increase in free radical generation in autism compared to control cells. Acute exposure to physiological levels of nitric oxide decreased mitochondrial membrane potential to a greater extent in the autism LCLs, although GSH/GSSG and ATP concentrations were similarly decreased in both cell lines. These results suggest that the autism LCLs exhibit a reduced glutathione reserve capacity in both cytosol and mitochondria that may compromise antioxidant defense and detoxification capacity under prooxidant conditions.
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Affiliation(s)
- S Jill James
- Department of Pediatrics, University of Arkansas for Medical Sciences, Arkansas Children's Hospital Research Institute, 1120 Marshall St., Little Rock, AR 72202, USA.
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Potent Upregulation of Glutathione and NAD(P)H:Quinone Oxidoreductase 1 by Alpha-lipoic Acid in Human Neuroblastoma SH-SY5Y Cells: Protection Against Neurotoxicant-elicited Cytotoxicity. Neurochem Res 2007; 33:790-800. [DOI: 10.1007/s11064-007-9496-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2007] [Accepted: 08/28/2007] [Indexed: 11/26/2022]
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Liu XY, Li CY, Bu H, Li Z, Li B, Sun MM, Guo YS, Zhang L, Ren WB, Fan ZL, Wu DX, Wu SY. The neuroprotective potential of phase II enzyme inducer on motor neuron survival in traumatic spinal cord injury in vitro. Cell Mol Neurobiol 2007; 28:769-79. [PMID: 17912625 DOI: 10.1007/s10571-007-9219-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Accepted: 08/31/2007] [Indexed: 11/26/2022]
Abstract
(1) Phase II enzyme inducer is a kind of compound which can promote the expression of antioxidative enzymes through nuclear factor erythroid 2-related factor 2 (Nrf2) activation. Recently, it has been reported that these compounds show neuroprotective effect via combating oxidative stress. The purpose of this study is to determine whether phase II enzyme inducers have neuroprotective effects on traumatic spinal cord injury. (2) An organotypic spinal cord culture system was used, Phase II enzyme inducers were added to culture medium for 1 week, motor neurons were counted by SMI-32 staining, glutamate, Nrf2, and Heme oxygenase-1(HO-1) mRNA were tested. (3) This study showed motor neuron loss within 1 week in culture. After 1 week in culture, the system was stable. Moreover, Glutamate was increased when in culture 48 h and decreased after 1 week in culture. There was no significant change between 1 and 4 weeks in culture. Necrotic motor neuron and damaged mitochondrial were observed in culture 48 h. Furthermore, phase II enzyme inducers: tert-butyhydroquinone (t-BHQ), 3H-1,2-dithiole-3-thione (D3T), and 5,6-dihydrocyclopenta-1,2-dithiole-3-thione (CPDT) were shown to promote motor neuron survival after dissection, it was due to increasing Nrf2 and HO-1 mRNA expression and protecting mitochondrial not due to decreasing glutamate level. (4) The loss of motor neuron due to dissection can mimic severe traumatic spinal cord injury. These results demonstrate that glutamate excitotoxicity and the damage of mitochondrial is possibly involve in motor neuron death after traumatic spinal cord injury and phase II enzyme inducers show neuroprotective potential on motor neuron survival in traumatic spinal cord injury in vitro.
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Affiliation(s)
- Xiao-Yun Liu
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, P.R. China
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Fesun IM, Rozhenko AB, Timoshenko VM. Reduction of 4-fluoro-5-(1,1,2,2-tetrafluoroethyl)-3H-1,2-dithiole-3-thione with sodium sulfide: Synthesis of fluoro-containing sulfur-rich heterocycles. J Fluor Chem 2006. [DOI: 10.1016/j.jfluchem.2006.02.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Kweon MH, In Park Y, Sung HC, Mukhtar H. The novel antioxidant 3-O-caffeoyl-1-methylquinic acid induces Nrf2-dependent phase II detoxifying genes and alters intracellular glutathione redox. Free Radic Biol Med 2006; 40:1349-61. [PMID: 16631525 DOI: 10.1016/j.freeradbiomed.2005.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2005] [Revised: 11/11/2005] [Accepted: 12/02/2005] [Indexed: 10/25/2022]
Abstract
Induction of detoxifying phase II genes by chemopreventive agents represents a coordinated protective response against oxidative stress and neoplastic effects of carcinogens. We have earlier shown that a novel antioxidant from the bamboo leaves constituent 3-O-caffeoyl-1-methylquinic acid (MCGA3) induces heme oxygenase-1 (HO-1) and protects endothelial cells from ROS-induced endothelial injury. The purpose of this study was to elucidate the induction mechanism of HO-1 and other phase II genes by MCGA3 in human umbilical vascular endothelial cells (HUVECs). Using Northern blotting and RT-PCR, we found that treatment of HUVECs with MCGA3 increased, in a dose and time-dependent manner, steady-state mRNA levels of the selected phase II genes including HO-1, ferritin, gamma-glutamylcysteine lygase, glutathione reductase, and glutathione transferase, which were dependent on Nrf2 nuclear translocation. The observed phase II gene induction by MCGA3 was found to be associated with MCGA3-mediated cytoprotective activity, ROS-scavenging potency, and the increase in the cellular levels of both reduced (GSH) and oxidized glutathione (GSSG). Interestingly, exposure to MCGA3 resulted in a decreased ratio of GSH/GSSG, which was negatively related with mRNA level of phase II genes. By employing N-acetylcysteine and GSH biosynthetic enzyme inhibitors as well as prooxidants, hemin and H(2)O(2), we show that a decreased intracellular GSH/GSSG homeostasis, at least in part, may be involved in the MCGA3-mediated phase II gene induction and Nrf2 translocation, although the attenuation of HO-1 expression with SP 600125 supports a partial involvement of JNK signaling.
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Affiliation(s)
- Mee-Hyang Kweon
- Department of Dermatology, University of Wisconsin, Medical Science Center, Madison, 53706, USA
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Yang W, Tiffany-Castiglioni E. The bipyridyl herbicide paraquat produces oxidative stress-mediated toxicity in human neuroblastoma SH-SY5Y cells: relevance to the dopaminergic pathogenesis. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2005; 68:1939-61. [PMID: 16263688 DOI: 10.1080/15287390500226987] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Paraquat (PQ) is a cationic nonselective bipyridyl herbicide widely used to control weeds and grasses in agriculture. Epidemiologic studies indicate that exposure to pesticides can be a risk factor in the incidence of Parkinson's disease (PD). A strong correlation has been reported between exposure to paraquat and PD incidence in Canada, Taiwan, and the United States. This correlation is supported by animal studies showing that paraquat produces toxicity in dopaminergic neurons of the rat and mouse brain. However, it is unclear how paraquat triggers toxicity in dopaminergic neurons. Based on the prooxidant properties of paraquat, it was hypothesized that paraquat may induce oxidative stress-mediated toxicity in dopaminergic neurons. To explore this possibility, dopaminergic SH-SY5Y cells were treated with paraquat, and several biomarkers of oxidativestress were measured. First, a specific dopamine transporter inhibitor GBR12909 significantly protected SY5Y cells against the toxicity of paraquat, indicating that paraquat exerts its toxicity by a mechanism involving the dopamine transporter (DAT). Second, paraquat increased intracellular levels of reactive oxygen species (ROS), but decreased the levels of glutathione. Third, paraquat inhibited glutathione peroxidase activity, but did not affect glutathione reductase activity. On the other hand, paraquat increased GST activity by 24 h, after which GST activity returned to the control value at 48 h. Fourth, paraquat dissipated mitochondrial transmembrane potential (MTP). Fifth, paraquat produced increases of malondialdehyde (MDA) and protein carbonyls, as well as DNA fragmentation, indicating oxidative damage to major cellular components. Sixth, paraquat increased the protein level of heme oxygenase-1 (HO-1). Taken together, these findings verify our hypothesis that paraquat produces oxidative stress-mediated toxicity in SH-SY5Y cells. Thus, current findings suggest that paraquat may induce the pathogenesis of dopaminergic neurons through oxidative stress.
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Affiliation(s)
- Wonsuk Yang
- Department of Integrative Biosciences, Texas A&M University, College Station, Texas 77843, USA
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