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Tao Y, Zhou H, Huang L, Xu X, Huang Y, Ma L, Li L, Yao X, Zhang R, Zhang Y, Rong W, Yang C, Yang T, Shen Y, Wang R. Schisandrin B Protects against Acute Ethanol-Induced Cardiac Injury by Downregulating Autophagy via the NOX4/ROS Pathway. Pharmacology 2021; 106:177-188. [PMID: 33486482 DOI: 10.1159/000510863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Accepted: 08/05/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Although oxidative stress has been demonstrated to mediate acute ethanol-induced changes in autophagy in the heart, the precise mechanism behind redox regulation in acute ethanol heart disease remains largely unknown. METHODS Wild-type C57BL/6 mice were intraperitoneally injected with ethanol (3 g/kg/day) for 3 consecutive days. The effects of ethanol on cultured primary cardiomyocytes and H9c2 myoblasts were also studied in vitro. Levels of autophagic flux, cardiac apoptosis and function, reactive oxygen species (ROS) accumulation, NOX4, and NOX2 were examined. The NOX4 gene was knocked down with NOX4 siRNA. RESULTS In this study, we demonstrated that schisandrin B inhibited acute ethanol-induced autophagy and sequent apoptosis. In addition, schisandrin B treatment improved cardiac function in ethanol-treated mice. Furthermore, NOX4 protein expression was increased during acute ethanol exposure, and the upregulation of NOX4 was significantly inhibited by schisandrin B treatment. The knockdown of NOX4 prevented ROS accumulation, cell autophagy, and apoptosis. CONCLUSION These results highlight that NOX4 is a critical mediator of ROS and elaborate the role of the NOX4/ROS axis in the effect of schisandrin B on autophagy and autophagy-mediated apoptosis in acute ethanol exposure, which suggests a therapeutic strategy for acute alcoholic cardiomyopathy.
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Affiliation(s)
- Youli Tao
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China,
| | - Hua Zhou
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Lili Huang
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Xiaoyin Xu
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Yun Huang
- School of Medicine, Ningbo University, Ningbo, China
| | - Lili Ma
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Lingna Li
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Xu Yao
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Ronghui Zhang
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Yuyu Zhang
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Weibo Rong
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Chaojun Yang
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Taotao Yang
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Yi Shen
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
| | - Rixiang Wang
- Ningbo Medical Centre LiHuili Hospital, Ningbo, China
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Simultaneous quantification of Schisandrin B enantiomers in rat plasma by chiral LC–MS/MS: Application in a stereoselective pharmacokinetic study. J Pharm Biomed Anal 2018; 159:186-191. [DOI: 10.1016/j.jpba.2018.06.056] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 01/06/2023]
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Liu Q, Song J, Li H, Dong L, Dai S. Schizandrin B inhibits the cis‑DDP‑induced apoptosis of HK‑2 cells by activating ERK/NF‑κB signaling to regulate the expression of survivin. Int J Mol Med 2018; 41:2108-2116. [PMID: 29393335 PMCID: PMC5810203 DOI: 10.3892/ijmm.2018.3409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 01/10/2018] [Indexed: 12/15/2022] Open
Abstract
The nephrotoxicity of cisplatin limits its clinical application. Schizandrin B (SchB) has been demonstrated to have a variety of potential cytoprotective activities. The present study explored the molecular mechanisms by which SchB inhibits the dichlorodiammine platinum (DDP)‑induced apoptosis of HK‑2 proximal tubule epithelial cells. In vitro assays demonstrated that SchB increased the viability of HK‑2 cells, alleviated the cis‑DDP‑induced activation of caspase‑3, reduced apoptosis and improved the nuclear morphology of HK‑2 cells. Additionally, the mechanism underlying the cis‑DDP‑induced apoptosis was indicated to involve the activation of p53, c‑Jun‑N‑terminal kinase (JNK) and p38 signaling. Furthermore, SchB was demonstrated to activate extracellular signal‑regulated kinase (ERK) and nuclear factor κB (NF‑κB) signaling, and induce the expression of survivin. The inhibition of ERK and NF‑κB signaling using U0126 and pyrollidine dithiocarbamate, respectively, inhibited the expression of survivin, whereas blocking the expression of survivin using small interfering RNA inhibited the alleviating effect of SchB on cis‑DDP‑induced apoptosis as indicated by a reduction in cleaved caspase‑3 expression. In conclusion, SchB regulates ERK/NF‑κB signaling to induce the expression of survivin, thereby alleviating cis‑DDP‑induced renal injury.
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Affiliation(s)
- Qiang Liu
- Department of Medical Imaging, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004
| | - Jinxin Song
- Department of Ophthalmology, The First Hospital of Xi’an, Xi’an, Shaanxi 710002
| | - Hong Li
- Department of Ophthalmology, The First Hospital of Xi’an, Xi’an, Shaanxi 710002
| | - Lei Dong
- Department of Gastroenterology, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, P.R. China
| | - Shejiao Dai
- Department of Gastroenterology, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, P.R. China
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Yi H, Chen Y, Liu J, Zhang J, Guo W, Xiao W, Yao Y. Extraction and Separation of Active Ingredients in Schisandra chinensis (Turcz.) Baill and the Study of their Antifungal Effects. PLoS One 2016; 11:e0154731. [PMID: 27152614 PMCID: PMC4859564 DOI: 10.1371/journal.pone.0154731] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 04/18/2016] [Indexed: 02/07/2023] Open
Abstract
Schisandra chinensis extracts (SEs) have traditionally been used as an oriental medicine for the treatment of various human diseases, however, their further application in the biocontrol of plant disease remains poorly understood. This study was conducted to develop eco-friendly botanical pesticides from extracts of S. chinensis and assess whether they could play a key role in plant disease defense. Concentrated active fractions (SE-I, SE-II, and SE-III) were obtained from S. chinensis via specific extraction and separation. Then, lignan-like substances, such as Schisanhenol B, were detected via High-Performance Liquid Chromatography-ElectroSpray Ionization-Mass Spectrometry (HPLC-ESI-MS) analyses of the active fractions. Moreover, the results from biological tests on colony growth inhibition and spore germination indicated that SE-I, SE-II, and SE-III could inhibit hyphal growth and spore generation of three important plant pathogenic fungi (Monilinia fructicola, Fusarium oxysporum, and Botryosphaeria dothidea). The study of the mechanisms of resistant fungi revealed that the oxidation resistance system, including reactive oxygen species (ROS), malondialdehyde (MDA), catalase (CAT), and superoxide dismutase (SOD), was activated. The expression of genes related to defense, such as pathogenesis-related protein (PR4), α-farnesene synthase (AFS), polyphenol oxidase (PPO), and phenylalanine ammonia lyase (PAL) were shown to be up-regulated after treatment with SEs, which suggested an increase in apple immunity and that fruits were induced to effectively defend against the infection of pathogenic fungi (B. dothidea). This study revealed that SEs and their lignans represent promising resources for the development of safe, effective, and multi-targeted agents against pathogenic fungi.
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Affiliation(s)
- Haijing Yi
- Plant Science and Technology College, Beijing University of Agriculture, Beijing, 102206, China
- Beijing Key Laboratory of New Technology in Agriculture Application, Beijing University of Agriculture, 102206, Beijing, China
| | - Yan Chen
- Plant Science and Technology College, Beijing University of Agriculture, Beijing, 102206, China
- Beijing Key Laboratory of New Technology in Agriculture Application, Beijing University of Agriculture, 102206, Beijing, China
| | - Jun Liu
- Institute of Microbiology, Chinese Academy of Sciences, 100101, Beijing, China
| | - Jie Zhang
- Plant Science and Technology College, Beijing University of Agriculture, Beijing, 102206, China
- Beijing Key Laboratory of New Technology in Agriculture Application, Beijing University of Agriculture, 102206, Beijing, China
| | - Wei Guo
- Plant Science and Technology College, Beijing University of Agriculture, Beijing, 102206, China
- Beijing Key Laboratory of New Technology in Agriculture Application, Beijing University of Agriculture, 102206, Beijing, China
| | - Weilie Xiao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China
| | - Yuncong Yao
- Plant Science and Technology College, Beijing University of Agriculture, Beijing, 102206, China
- Beijing Key Laboratory of New Technology in Agriculture Application, Beijing University of Agriculture, 102206, Beijing, China
- * E-mail:
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Slanina J, Páchniková G, Carnecká M, Porubová Koubíková L, Adámková L, Humpa O, Smejkal K, Slaninová I. Identification of key structural characteristics of Schisandra chinensis lignans involved in P-glycoprotein inhibition. JOURNAL OF NATURAL PRODUCTS 2014; 77:2255-63. [PMID: 25302569 DOI: 10.1021/np500521v] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The aim of the present study was to determine the structural requirements for dibenzocyclooctadiene lignans essential for P-glycoprotein inhibition. Altogether 15 structurally related lignans isolated from Schisandra chinensis or prepared by modification of their backbone were investigated, including three pairs of enantiomers. P-Glycoprotein inhibition was quantified using a doxorubicin accumulation assay in human promyelotic leukemia HL60/MDR cells overexpressing P-glycoprotein. A preliminary quantitative structure-activity relationship analysis revealed three main structural features involved in P-glycoprotein inhibition: a 1,2,3-trimethoxy moiety, a 6-acyloxy group, and the absence of a 7-hydroxy group. The most effective inhibitors, (-)-gomisin N (1) and (+)-deoxyschizandrin [(+)-2], were selected for further evaluation of their effects. Both these lignans restored the cytotoxic effect of doxorubicin in HL60/MDR cells and when combined with a subtoxic concentration of this compound increased the proportion of G2/M cells significantly, which is a usual response to treatment with this anticancer drug.
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Affiliation(s)
- Jiří Slanina
- Department of Biochemistry, Faculty of Medicine, Masaryk University , Kamenice 5, Building A16, 625 00 Brno, Czech Republic
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Chun JN, Cho M, So I, Jeon JH. The protective effects of Schisandra chinensis fruit extract and its lignans against cardiovascular disease: A review of the molecular mechanisms. Fitoterapia 2014; 97:224-33. [DOI: 10.1016/j.fitote.2014.06.014] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 06/19/2014] [Accepted: 06/20/2014] [Indexed: 02/06/2023]
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Maiwulanjiang M, Chen J, Xin G, Gong AGW, Miernisha A, Du CYQ, Lau KM, Lee PSC, Chen J, Dong TTX, Aisa HA, Tsim KWK. The volatile oil of Nardostachyos Radix et Rhizoma inhibits the oxidative stress-induced cell injury via reactive oxygen species scavenging and Akt activation in H9c2 cardiomyocyte. JOURNAL OF ETHNOPHARMACOLOGY 2014; 153:491-498. [PMID: 24632018 DOI: 10.1016/j.jep.2014.03.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 03/03/2014] [Accepted: 03/04/2014] [Indexed: 06/03/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Nardostachyos Radix et Rhizoma (NRR; the root and rhizome of Nardostachys jatamansi DC.) is a well-known medicinal herb widely used in Chinese, Uyghur and Ayurvedic medicines for the treatment of cardiovascular disorders. The oxidative stress-induced cardiomyocyte loss is the major pathogenesis of heart disorders. Here, the total volatile oil of NRR was isolated, and its function in preventing the cell death of cardiomyocyte was demonstrated. MATERIALS AND METHODS The cyto-protective effect of volatile oil of NRR against tBHP-induced H9c2 cardiomyocyte injury was measured by MTT assay. A promoter-report construct (pARE-Luc) containing four repeats of antioxidant response element (ARE) was applied to study the transcriptional activation of ARE. The amounts of phase ΙΙ antioxidant enzymes were analyzed by quantitative real-time polymer chain reaction (qPCR) upon the volatile oil treatment at 30 μg/mL for 24 h. The activation of Akt pathway was analyzed by western blot. RESULTS In cultured H9c2 cardiomyocytes, application of NRR volatile oil exhibited strong potency in preventing tBHP-induced cell death and accumulation of intracellular reactive oxygen species (ROS) in a concentration-dependent manner. In addition, the application of NRR volatile oil in cultures stimulated the gene expressions of self-defense antioxidant enzymes, which was mediated by the transcriptional activation of antioxidant response element (ARE). The induced genes were glutathione S-transferase, NAD(P)H quinone oxidoreductase, glutamate-cysteine ligase catalytic and modulatory subunits. In addition, the volatile oil of NRR activated the phosphorylation of Akt in cultured H9c2 cells. The treatment of LY294002, an Akt inhibitor, significantly inhibited the volatile oil-mediated ARE transcriptional activity, as well as the cell protective effect of NRR oil. CONCLUSION These results demonstrated that NRR volatile oil prevented the oxidative stress-induced cell death in H9c2 cells by (i) reducing intracellular ROS production, (ii) inducing antioxidant enzymes and (iii) activating Akt phosphorylation.
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Affiliation(s)
- Maitinuer Maiwulanjiang
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Jianping Chen
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Guizhong Xin
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Amy G W Gong
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Abudureyimu Miernisha
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Crystal Y Q Du
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Kei M Lau
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Pinky S C Lee
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Jihang Chen
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Tina T X Dong
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China
| | - Haji A Aisa
- Xinjiang Key Laboratory of Plant Resources and Natural Products Chemistry, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Karl W K Tsim
- Division of Life Science and Centre for Chinese Medicine, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong, China.
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Cardioprotective and antioxidant activities of a polysaccharide from the root bark of Aralia elata (Miq.) Seem. Carbohydr Polym 2013; 93:442-8. [DOI: 10.1016/j.carbpol.2012.12.048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Revised: 12/05/2012] [Accepted: 12/13/2012] [Indexed: 11/20/2022]
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9
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Chiu PY, Leung HY, Leong PK, Chen N, Zhou L, Zuo Z, Lam PY, Ko KM. Danshen-Gegen decoction protects against hypoxia/reoxygenation-induced apoptosis by inhibiting mitochondrial permeability transition via the redox-sensitive ERK/Nrf2 and PKCε/mKATP pathways in H9c2 cardiomyocytes. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2012; 19:99-110. [PMID: 21899994 DOI: 10.1016/j.phymed.2011.07.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 06/19/2011] [Accepted: 07/26/2011] [Indexed: 05/31/2023]
Abstract
Danshen-Gegen (DG) Decoction, an herbal formulation containing Radix Salviae miltiorrhizae and Radix Puerariae lobatae, has been used for the treatment of coronary artery disease in Chinese medicine. In the present study, the involvement of ERK- and PKCε-mediated pathways in the cytoprotection against apoptosis afforded by DG pretreatment was investigated in H9c2 cardiomyocytes. Pretreatment with a methanol extract of aqueous DG decoction protected against hypoxia/reoxygenation-induced apoptosis in H9c2 cardiomyocytes. The cytoprotection was associated the enhancement of cellular reduced glutathione and a reduced sensitivity to Ca(2+)-induced mitochondrial permeability transition. DG extract increased the production of cytochrome P-450 (CYP)-dependent reactive oxygen species (ROS) in H9c2 cardiomyocytes, which was accompanied by the concomitant activation of ERK1/2 and PKCε. The DG-induced ERK1/2 activation was followed by the translocation of Nrf2 from the cytosol to the mitochondria accompanied by an increase in the expression of glutathione-related antioxidant proteins. In addition, the increased expression of hemeoxygenase-1 was associated with the activation of Akt and BAD, indicative of anti-apoptotic activity. In conclusion, DG treatment activated both ERK/Nrf2 and PKCε pathways, presumably by ROS arising from CYP-catalyzed processes, with resultant inhibition of hypoxia/reoxygenation-induced apoptosis immediately after DG treatment or even after an extended time interval following DG treatment.
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Affiliation(s)
- Po Yee Chiu
- Division of Life Science, The Hong Kong University of Science & Technology, Clear Water Bay, China
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Lam PY, Leong PK, Chen N, Ko KM. Schisandrin B enhances the glutathione redox cycling and protects against oxidant injury in different types of cultured cells. Biofactors 2011; 37:439-46. [PMID: 22034285 DOI: 10.1002/biof.179] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2011] [Accepted: 06/02/2011] [Indexed: 11/10/2022]
Abstract
Tert-butylhydroperoxide (tBHP) challenge caused an initial depletion of cellular reduced glutathione (GSH), which was followed by a gradual restoration of cellular GSH in AML12, H9c2, and differentiated PC12 cells. The time-dependent changes in cellular GSH induced by tBHP were monitored as a measure of GSH recovery capacity (GRC), of which glutathione reductase (GR)-mediated glutathione redox cycling and γ-glutamate cysteine ligase (GCL)-mediated GSH synthesis were found to play an essential role. While glutathione redox cycling sustained the GSH level during the initial tBHP-induced depletion, GSH synthesis restores the GSH level thereafter. The effects of (-)schisandrin B [(-)Sch B] and its analogs (Sch A and Sch C) on GRC were also examined in the cells. (-)Sch B and Sch C, but not Sch A, ameliorated the extent of tBHP-induced GSH depletion, indicative of enhanced glutathione redox cycling. However, the degree of restoration of GSH post-tBHP challenge was not affected or even decreased. Pretreatment with (-)Sch B and Sch C, but not Sch A, protected against oxidant injury in the cells. The (-)Sch B afforded cytoprotection was abolished by N,N'-bis(chloroethyl)-N-nitrosourea pretreatment suggesting the enhancement of glutathione redox cycling is crucially involved in the cytoprotection afforded by (-)Sch B against oxidative stress-induced cell injury.
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Affiliation(s)
- Philip Y Lam
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
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Lam PY, Ko KM. (-)Schisandrin B ameliorates paraquat-induced oxidative stress by suppressing glutathione depletion and enhancing glutathione recovery in differentiated PC12 cells. Biofactors 2011; 37:51-7. [PMID: 21328628 DOI: 10.1002/biof.136] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Accepted: 10/19/2010] [Indexed: 11/12/2022]
Abstract
Exposure to paraquat (PQ; N,N'-dimethyl-4-4'-bipyridium), a potent herbicide, can lead to neuronal cell death and increased risk of Parkinson's disease because of oxidative stress. In this study, we investigated the effect of (-)schisandrin B [(-)Sch B, a potent enantiomer of schisandrin B] on PQ-induced cell injury in differentiated pheochromocytoma cells (PC12). PQ treatment caused cell injury in PC12 cells, as indicated by the significant increase in lactate dehydrogenase (LDH) leakage. Pretreatment with (-)Sch B (5 μM) protected against PQ-induced toxicity in PC12 cells, as evidenced by the significant decrease in LDH leakage. (-)Sch B induced the cytochrome P-450-mediated reactive oxygen species generation in differentiated PC12 cells. The cytoprotection afforded by (-)Sch B pretreatment was associated with an increase in cellular reduced glutathione (GSH) level as well as the enhancement of γ-glutamylcysteine ligase (GCL) and glutathione reductase (GR) activity in PQ-challenged cells. Both GCL and GR inhibitors abrogated the cytoprotective effect of (-)Sch B in PQ-challenged cells. The biochemical mechanism underlying the GSH-enhancing effect of (-)Sch B was further investigated in PC12 cells subjected to an acute peroxide challenge. Although the initial GSH depletion induced by peroxide was reduced through GR-catalyzed regeneration of GSH in (-)Sch B-pretreated cells, the later enhanced GSH recovery was mainly mediated by GCL-catalyzed GSH synthesis. The results suggest that (-)Sch B treatment may increase the resistance of dopaminergic cells against PQ-induced oxidative stress through reducing the extent of oxidant-induced GSH depletion and enhancing the subsequent GSH recovery.
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Affiliation(s)
- Philip Y Lam
- Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
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Chiu PY, Chen N, Leong PK, Leung HY, Ko KM. Schisandrin B elicits a glutathione antioxidant response and protects against apoptosis via the redox-sensitive ERK/Nrf2 pathway in H9c2 cells. Mol Cell Biochem 2010; 350:237-50. [PMID: 21193948 DOI: 10.1007/s11010-010-0703-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 12/10/2010] [Indexed: 11/24/2022]
Abstract
This study investigated the signal transduction pathway involved in the cytoprotective action of (-)schisandrin B [(-)Sch B, a stereoisomer of Sch B]. Using H9c2 cells, the authors examined the effects of (-)Sch B on MAPK and Nrf2 activation, as well as the subsequent eliciting of glutathione response and protection against apoptosis. Pharmacological tools, such as cytochrome P-450 (CYP) inhibitor, antioxidant, MAPK inhibitor, and Nrf2 RNAi, were used to delineate the signaling pathway. (-)Sch B caused a time-dependent activation of MAPK in H9c2 cells, with the degree of ERK activation being much larger than that of p38 or JNK. The MAPK activation was followed by an increase in the level of nuclear Nrf2, an indirect measure of Nrf2 activation, and the eliciting of a glutathione antioxidant response. The activation of MAPK and Nrf2 seemed to involve oxidants generated from a CYP-catalyzed reaction with (-)Sch B. Both ERK inhibition by U0126 and Nrf2 suppression by Nrf2 RNAi transfection largely abolished the cytoprotection against hypoxia/reoxygenation-induced apoptosis in (-)Sch B-pretreated cells. (-)Sch B pretreatment potentiated the reoxygenation-induced ERK activation, whereas both p38 and JNK activations were suppressed. Under the condition of ERK inhibition, Sch B treatment did not protect against ischemia/reperfusion injury in an ex vivo rat heart model. The results indicate that (-)Sch B triggers a redox-sensitive ERK/Nrf2 signaling, which then elicits a cellular glutathione antioxidant response and protects against hypoxia/reoxygenation-induced apoptosis in H9c2 cells. The ERK-mediated signaling is also likely involved in the cardioprotection afforded by Sch B in vivo.
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Affiliation(s)
- Po Yee Chiu
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
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Panossian A, Wikman G. Effects of Adaptogens on the Central Nervous System and the Molecular Mechanisms Associated with Their Stress-Protective Activity. Pharmaceuticals (Basel) 2010; 3:188-224. [PMID: 27713248 PMCID: PMC3991026 DOI: 10.3390/ph3010188] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 01/11/2010] [Accepted: 01/16/2010] [Indexed: 12/17/2022] Open
Abstract
Adaptogens were initially defined as substances that enhance the "state of nonspecific resistance" in stress, a physiological condition that is linked with various disorders of the neuroendocrine-immune system. Studies on animals and isolated neuronal cells have revealed that adaptogens exhibit neuroprotective, anti-fatigue, antidepressive, anxiolytic, nootropic and CNS stimulating activity. In addition, a number of clinical trials demonstrate that adaptogens exert an anti-fatigue effect that increases mental work capacity against a background of stress and fatigue, particularly in tolerance to mental exhaustion and enhanced attention. Indeed, recent pharmacological studies of a number of adaptogens have provided a rationale for these effects also at the molecular level. It was discovered that the stress-protective activity of adaptogens was associated with regulation of homeostasis via several mechanisms of action, which was linked with the hypothalamic-pituitary-adrenal axis and the regulation of key mediators of stress response, such as molecular chaperons (e.g., HSP70), stress-activated c-Jun N-terminal protein kinase 1 (JNK1), Forkhead box O (FOXO) transcription factor DAF-16, cortisol and nitric oxide.
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Affiliation(s)
- Alexander Panossian
- Swedish Herbal Institute Research & Development, Spårvägen 2, SE-432 96 Åskloster, Sweden.
| | - Georg Wikman
- Swedish Herbal Institute Research & Development, Spårvägen 2, SE-432 96 Åskloster, Sweden
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Luk KF, Ko KM, Ng KM. Separation and purification of (−)schisandrin B from schisandrin B stereoisomers. Biochem Eng J 2008. [DOI: 10.1016/j.bej.2008.05.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Billinsky JL, Krol ES. Nordihydroguaiaretic acid autoxidation produces a schisandrin-like dibenzocyclooctadiene lignan. JOURNAL OF NATURAL PRODUCTS 2008; 71:1612-1615. [PMID: 18672930 DOI: 10.1021/np8001354] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The lignan meso-nordihydroguaiaretic acid is known to undergo spontaneous oxidation in alkaline solution. In the presence of the trapping agent glutathione, the major oxidation products are consistent with the formation of a meso-nordihydroguaiaretic acid ortho-quinone. In the absence of a trapping agent however, the major oxidation product of meso-nordihydroguaiaretic acid in aqueous solution is a unique, stable schisandrin-like dibenzocyclooctadiene lignan that may be responsible for some of the biological effects of nordihydroguaiaretic acid.
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Luk KF, Ko KM, Ng KM. Separation and Purification of Schisandrin B from Fructus Schisandrae. Ind Eng Chem Res 2008. [DOI: 10.1021/ie071317b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ka F. Luk
- Bioengineering Graduate Program, Department of Biochemistry, and, Department of Chemical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Kam M. Ko
- Bioengineering Graduate Program, Department of Biochemistry, and, Department of Chemical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
| | - Ka M. Ng
- Bioengineering Graduate Program, Department of Biochemistry, and, Department of Chemical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong
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Schisandrin B stereoisomers protect against hypoxia/reoxygenation-induced apoptosis and inhibit associated changes in Ca2+-induced mitochondrial permeability transition and mitochondrial membrane potential in H9c2 cardiomyocytes. Life Sci 2008; 82:1092-101. [DOI: 10.1016/j.lfs.2008.03.006] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2007] [Revised: 02/11/2008] [Accepted: 03/19/2008] [Indexed: 11/17/2022]
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Kim J, Jung YS, Han W, Kim MY, Namkung W, Lee BH, Yi KY, Yoo SE, Lee MG, Kim KH. Pharmacodynamic characteristics and cardioprotective effects of new NHE1 inhibitors. Eur J Pharmacol 2007; 567:131-8. [PMID: 17482160 DOI: 10.1016/j.ejphar.2007.03.056] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2007] [Revised: 03/22/2007] [Accepted: 03/27/2007] [Indexed: 11/19/2022]
Abstract
Inhibitors of Na(+)/H(+) exchanger (NHE) 1 have been shown to exert protective effects on various myocardial injuries. In this study, we characterized the pharmacodynamic properties of new guanidine NHE1 inhibitors (cariporide, sabiporide, KR-32511, KR-32570, and KR-33028) to analyze their myocardial protective effects. Although NHE1 is the major NHE isoform in cardiomyocytes, IC(50)values of these chemicals tested in rat cardiomyocytes were significantly different from those in PS120/hNHE1 cells where human NHE1 is heterologously expressed. In rat cardiomyocytes, KR-32570 and KR-33028 exhibited the highest potencies and their IC(50)values were 7+/-2 nM and 9+/-3 nM, respectively. The IC(50)values of all the chemicals tested on rat submandibular gland NHE2 were in the micromolar range, and they showed no inhibitory effects on hNHE3 and epithelial Na(+) channels up to 30 microM, suggesting a high selectivity toward NHE1. Sabiporide and KR-32570 exhibited slow dissociation kinetics with NHE1 inhibition persisting even after rinsing-out. When the cytoprotective effects of chemicals against hypoxic damage of rat cardiomyocytes were examined, the order of potency was KR-32570>or=KR-33028>sabiporide>cariporide>KR-32511. This order was exactly the same as that for the NHE1 inhibition in rat cardiomyocytes and did not correlate with any other properties, including the slow dissociation kinetics. Taken together, these results suggest that KR-32570 and KR-33028 are potent candidates for cardioprotective agents, and that the IC(50) in the target organ is the most critical factor governing the cytoprotective effects of NHE1 inhibitors.
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Affiliation(s)
- Juno Kim
- Department of Pharmacology, Yonsei University College of Medicine, Sinchon-Dong, Seoul 120-752, Republic of Korea
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