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Faheem SA, Hazem RM, Elsayed NM, Ahmed YM, Saeed NM. Niclosamide modulates cyclosporin A-induced hepatotoxicity in a mouse model: PPAR-γ and Wnt/β-catenin crosstalk. Int Immunopharmacol 2023; 117:109941. [PMID: 37012891 DOI: 10.1016/j.intimp.2023.109941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/06/2023] [Accepted: 02/23/2023] [Indexed: 03/06/2023]
Abstract
OBJECTIVES The aim of this study was to evaluate whether: 1) Wnt/β-catenin signaling is involved in cyclosporin A (CsA)-induced hepatotoxicity, and 2) knockdown of this pathway by niclosamide (NCL) attenuate CsA-induced hepatotoxicity. METHODS The experiment was accomplished in 21 days. Adult male mice were randomly distributed into five groups: control group, CsA (25 mg/kg/day) group, CsA + NCL (2.5 mg/kg/day) group, CsA + NCL (5 mg/kg/day) group, and NCL (5 mg/kg/day) group. RESULTS NCL showed marked hepatoprotection by significantly decreasing liver enzymes activities and ameliorating the histopathological alterations induced by CsA. Besides, NCL alleviated oxidative stress and inflammation. NCL-treated groups (2.5 and 5 mg/kg) displayed rise in the expression of hepatic peroxisome proliferator-activated receptor-γ (PPAR-γ) by 2.1- and 2.5-fold, respectively. Notably, NCL (2.5 and 5 mg/kg) significantly inhibited Wnt/β-catenin signaling, evidenced by a marked decrease in the hepatic expression of Wnt3a by 54 % and 50 %, frizzled-7 receptor by 50 % and 50 %, β-catenin by 22 % and 49 %, and c-myc by 50 % and 50 %, respectively. CONCLUSIONS NCL can be regarded as a potential agent to mitigate CsA-induced hepatotoxicity.
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Affiliation(s)
- Safaa A Faheem
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Egyptian Russian University, Cairo, Egypt
| | - Reem M Hazem
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
| | - Norhan M Elsayed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
| | - Yasser M Ahmed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Badr University in Cairo, Cairo, Egypt
| | - Noha M Saeed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Egyptian Russian University, Cairo, Egypt.
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Lorant J, Larcher T, Jaulin N, Hedan B, Lardenois A, Leroux I, Dubreil L, Ledevin M, Goubin H, Moullec S, Deschamps JY, Thorin C, André C, Adjali O, Rouger K. Vascular Delivery of Allogeneic MuStem Cells in Dystrophic Dogs Requires Only Short-Term Immunosuppression to Avoid Host Immunity and Generate Clinical/Tissue Benefits. Cell Transplant 2018; 27:1096-1110. [PMID: 29871519 PMCID: PMC6158548 DOI: 10.1177/0963689718776306] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 04/05/2018] [Accepted: 04/17/2018] [Indexed: 01/15/2023] Open
Abstract
Growing demonstrations of regenerative potential for some stem cells led recently to promising therapeutic proposals for neuromuscular diseases. We have shown that allogeneic MuStem cell transplantation into Golden Retriever muscular dystrophy (GRMD) dogs under continuous immunosuppression (IS) leads to persistent clinical stabilization and muscle repair. However, long-term IS in medical practice is associated with adverse effects raising safety concerns. Here, we investigate whether the IS removal or its restriction to the transplantation period could be considered. Dogs aged 4-5 months old received vascular infusions of allogeneic MuStem cells without IS (GRMDMU/no-IS) or under transient IS (GRMDMU/tr-IS). At 5 months post-infusion, persisting clinical status improvement of the GRMDMU/tr-IS dogs was observed while GRMDMU/no-IS dogs exhibited no benefit. Histologically, only 9-month-old GRMDMU/tr-IS dogs showed an increased muscle regenerative activity. A mixed cell reaction with the host peripheral blood mononucleated cells (PBMCs) and corresponding donor cells revealed undetectable to weak lymphocyte proliferation in GRMDMU/tr-IS dogs compared with a significant proliferation in GRMDMU/no-IS dogs. Importantly, any dog group showed neither cellular nor humoral anti-dystrophin responses. Our results show that transient IS is necessary and sufficient to sustain allogeneic MuStem cell transplantation benefits and prevent host immunity. These findings provide useful critical insight to designing therapeutic strategies.
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Affiliation(s)
- Judith Lorant
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
- Judith Lorant and Thibaut Larcher both contributed equally to this work
| | - Thibaut Larcher
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
- Judith Lorant and Thibaut Larcher both contributed equally to this work
| | - Nicolas Jaulin
- INSERM, UMR1089, Centre Hospitalier Universitaire, Nantes, France
| | - Benoît Hedan
- CNRS, UMR6290, Institut de Génétique et Développement de Rennes, Université Rennes 1, Rennes, France
- Université Rennes 1, UEB, IFR140, Faculté de Médecine, Rennes, France
| | - Aurélie Lardenois
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
| | - Isabelle Leroux
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
| | - Laurence Dubreil
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
| | - Mireille Ledevin
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
| | - Hélicia Goubin
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
| | | | - Jack-Yves Deschamps
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
- Centre de Boisbonne, Oniris, Nantes, France
| | - Chantal Thorin
- Laboratoire de Physiopathologie Animale et Pharmacologie Fonctionnelle, Oniris, Nantes, France
| | - Catherine André
- CNRS, UMR6290, Institut de Génétique et Développement de Rennes, Université Rennes 1, Rennes, France
- Université Rennes 1, UEB, IFR140, Faculté de Médecine, Rennes, France
| | - Oumeya Adjali
- INSERM, UMR1089, Centre Hospitalier Universitaire, Nantes, France
| | - Karl Rouger
- PAnTher, INRA, École Nationale Vétérinaire, Agro-alimentaire et de l’Alimentation Nantes-Atlantique (Oniris), Université Bretagne Loire (UBL), Nantes, F-44307, France
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CsA attenuates compression-induced nucleus pulposus mesenchymal stem cells apoptosis via alleviating mitochondrial dysfunction and oxidative stress. Life Sci 2018; 205:26-37. [PMID: 29746847 DOI: 10.1016/j.lfs.2018.05.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 05/05/2018] [Indexed: 12/31/2022]
Abstract
AIMS This study aims to investigate the protective effects and potential mechanisms of cyclosporine A (CsA), which efficiently inhibits mitochondrial permeability transition pore (MPTP) opening, on compression-induced apoptosis of human nucleus pulposus mesenchymal stem cells (NP-MSCs). MATERIALS AND METHODS Human NP-MSCs were subjected to various periods of 1.0 MPa compression. Cell viability was evaluated using cell counting kit-8 (CCK-8) assay. The cellular ultrastructure and ATP level were analyzed via transmission electron microscopy (TEM) and ATP detection kit respectively. The apoptosis ratio was determined using Annexin V/PI dual staining and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assays. The levels of apoptosis-associated molecules (cleaved caspase-3, Bax and Bcl-2) were analyzed by western blot and qRT-PCR. Additionally, MPTP opening, mitochondrial membrane potential (MMP) and the levels of oxidative stress-related indicators (ROS), superoxide dismutase (SOD) and malondialdehyde (MDA) were monitored. KEY FINDINGS Annexin V/PI dual staining and detection of apoptosis-associated molecules demonstrated that compression significantly up-regulated apoptosis level of NP-MSCs in a time-dependent manner. CsA greatly down-regulated compression-mediated NP-MSC apoptosis and the cell death ratio. Compression also notably exacerbated mitochondrial dysfunction, ATP depletion and oxidative stress in NP-MSCs, all of which were rescued by CsA. SIGNIFICANCE Our results demonstrated that CsA efficiently inhibited compression-induced NP-MSCs apoptosis by alleviating mitochondrial dysfunction and oxidative stress. These findings provide new insights into intervertebral disc (IVD) degeneration (IVDD), and suggest CsA treatment as a potential strategy for delaying or even preventing IVDD.
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Gao YX, He WT, Pan LF, Feng H, Sun JL, Zhang B, Yu L, Li LJ. Downregulation of Akt2 attenuates ER stress-induced cytotoxicity through JNK-Wnt pathway in cardiomyocytes. Bioorg Med Chem Lett 2018; 28:394-399. [PMID: 29275936 DOI: 10.1016/j.bmcl.2017.12.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/10/2017] [Accepted: 12/13/2017] [Indexed: 02/05/2023]
Abstract
Akt, also known as protein kinase B (PKB), is a serine/threonine kinase that promotes survival and growth in response to extracellular signals. Akt1 has been demonstrated to play vital roles in cardiovascular diseases, but the role of Akt2 in cardiomyocytes is not fully understood. This study investigated the effect of Akt2 knockdown on tunicamycin (TM)-induced cytotoxicity in cardiomyocytes and the underlying mechanisms with a focus on the JNK-Wnt pathway. TM treatment significantly increased the expression of Akt2 at both mRNA and protein levels, which was shown to be mediated by the induction of reactive oxygen species (ROS). Knockdown of Akt2 expression via siRNA transfection markedly increased cell viability, decreased lactate dehydrogenase (LDH) release and reduced cell apoptosis after TM exposure. The results of western blot showed that downregulation of Akt2 also attenuated the TM-induced activation of the unfolded protein response (UPR) factors and ER stress associated pro-apoptotic proteins. In addition, Si-Akt2 transfection partially prevented the TM-induced decrease in nuclear localization of β-catenin. By using the selective inhibitor SP-600,125 to inhibit JNK phosphorylation, we found that knockdown of Akt2-induced protection and inhibition of ER stress was mediated by reversing TM-induced decrease of Wnt through the JNK pathway. In summary, these data suggested that Akt2 play a pivotal role in regulating cardiomyocyte survival during ER stress by modulating the JNK-Wnt pathway.
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Affiliation(s)
- Yan-Xia Gao
- Department of Emergency Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, China
| | - Wen-Ting He
- Department of Medicine, The Fourth Hospital of Xi'an, Xi'an, Shannxi 710004, China
| | - Long-Fei Pan
- Department of Emergency Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, China
| | - Hui Feng
- Department of Emergency Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, China
| | - Jiang-Li Sun
- Department of Emergency Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, China
| | - Bin Zhang
- Department of Neurology, The First Hospital of Yulin, Yulin, Shannxi 718000, China
| | - Lei Yu
- Department of Basic Medical Science, Xi'an Medical University, Xi'an, Shaanxi, 710021, China
| | - Li-Jun Li
- Department of Cardiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an Jiaotong University, 157 Xiwu Road, Xi'an, Shaanxi 710004, China.
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Tao J, Abudoukelimu M, Ma YT, Yang YN, Li XM, Chen BD, Liu F, He CH, Li HY. Secreted frizzled related protein 1 protects H9C2 cells from hypoxia/re-oxygenation injury by blocking the Wnt signaling pathway. Lipids Health Dis 2016; 15:72. [PMID: 27048460 PMCID: PMC4822324 DOI: 10.1186/s12944-016-0240-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 03/30/2016] [Indexed: 11/17/2022] Open
Abstract
Background In animal models, secreted frizzled related protein 1 (Sfrp1) inhibition of the Wnt signaling pathway is beneficial because Sfrp1 reduces myocardial apoptosis and prevents heart failure. The mechanisms mediating the cellular survival effect of Sfrp1 has not been completely elucidated. The present study was designed to investigate the possible protective actions of Sfrp1 on cardiac muscle cells using an in vitro model of ischemia/reperfusion, and to evaluate the possible involvement of the Wnt signaling pathway. Methods We used a recombinant AAV9 vector to deliver the Sfrp1 gene into H9C2 rat cardiomyoblasts and adopted an in vitro model of ischemia/reperfusion. Cell vitality was measured by CKK-8 and the trypan blue exclusion assay. Western blot was used to evaluate the expression of Dvl-1, β-catenin, c-Myc, Bax, and Bcl-2. Flow cytometry analysis of cardiomyocyte apoptosis was performed. Results We confirmed that Sfrp1 significantly increased cell viability (assayed by trypan blue and CKK-8) and decreased apoptosis (assayed by flow cytometry analysis and the Bax/Bcl-2 ratio). These effects were partly attributable to the ability of Sfrp1 to down-regulate Wnt signaling pathway (assayed by Western blot to evaluate the expression of Dvl-1, β-catenin, and c-Myc). Indeed, reactivation of the Wnt signaling pathway activity with the specific activator, Licl, reduced Sfrp1-induced cardioprotection during hypoxia and reoxygenation. Conclusions The present study demonstrated that Sfrp1 directly protected H9C2 cells from hypoxia and reoxygenation-induced reperfusion injury and apoptosis through inhibition of the Wnt signaling pathway, and added new mechanistic insight regarding the cardioprotective role of Sfrp1 on ischemic damage. Electronic supplementary material The online version of this article (doi:10.1186/s12944-016-0240-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jing Tao
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.,Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Mayila Abudoukelimu
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.,Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Yi-tong Ma
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China. .,Xinjiang Key Laboratory of Cardiovascular Disease Research, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China. .,Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
| | - Yi-ning Yang
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Xiao-mei Li
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Bang-dang Chen
- Xinjiang Key Laboratory of Cardiovascular Disease Research, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Fen Liu
- Xinjiang Key Laboratory of Cardiovascular Disease Research, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Chun-hui He
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.,Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
| | - Hua-yin Li
- Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.,Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China
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FAM3A attenuates ER stress-induced mitochondrial dysfunction and apoptosis via CHOP-Wnt pathway. Neurochem Int 2016; 94:82-9. [DOI: 10.1016/j.neuint.2016.02.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Revised: 02/18/2016] [Accepted: 02/19/2016] [Indexed: 12/13/2022]
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Tao H, Yang JJ, Shi KH, Li J. Wnt signaling pathway in cardiac fibrosis: New insights and directions. Metabolism 2016; 65:30-40. [PMID: 26773927 DOI: 10.1016/j.metabol.2015.10.013] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/19/2015] [Accepted: 10/01/2015] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Wnt signaling pathway significantly participates in cardiac fibrosis and CFs activation. Therefore, we reviewed current evidence on the new perspectives and biological association between Wnt signaling pathway and cardiac fibrosis. DESIGN AND METHODS A PubMed database search was performed for studies of Wnt signaling pathway in cardiac fibrosis and CFs activation. RESULTS Numerous studies have shown that the Wnt signaling pathway significantly participates in cardiac fibrosis pathogenesis. The aim of this review is to describe the present knowledge about the Wnt signaling pathway significantly participating in cardiac fibrosis and CFs activation, and look ahead on new perspectives of Wnt signaling pathway research. Moreover, we will discuss the different insights that interact with the Wnt signaling pathway-regulated cardiac fibrosis. The Wnt proteins are glycoproteins that bind to the Fz receptors on the cell surface, which lead to several important biological functions, such as cell differentiation and proliferation. There are several signals among the characterized pathways of cardiac fibrosis, including Wnt/β-catenin signaling. In this review, new insight into the Wnt signaling pathway in cardiac fibrosis pathogenesis is discussed, with special emphasis on Wnt/β-catenin. CONCLUSION It seems reasonable to suggest the potential targets of Wnt signaling pathway and it can be developed as a therapeutic target for cardiac fibrosis.
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Affiliation(s)
- Hui Tao
- Department of Cardiothoracic Surgery, The Second Hospital of Anhui Medical University, Hefei, China 230601; Cardiovascular Research Center, Anhui Medical University, Hefei, China 230601
| | - Jing-Jing Yang
- Department of Pharmacology, The Second Hospital of Anhui Medical University, Hefei, China 230601.
| | - Kai-Hu Shi
- Department of Cardiothoracic Surgery, The Second Hospital of Anhui Medical University, Hefei, China 230601; Cardiovascular Research Center, Anhui Medical University, Hefei, China 230601.
| | - Jun Li
- School of pharmacy, Anhui Medical University, Hefei, China 230032
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FrzA gene protects cardiomyocytes from H2O2-induced oxidative stress through restraining the Wnt/Frizzled pathway. Lipids Health Dis 2015; 14:90. [PMID: 26282432 PMCID: PMC4539933 DOI: 10.1186/s12944-015-0088-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 07/25/2015] [Indexed: 12/16/2022] Open
Abstract
Background Lately, there is accumulating evidence that the Wnt/Frizzled pathway is reactivated after myocardial infarction, the inhibition of the pathway is beneficial since it reduce of myocardial apoptosis and prevents heart failure. FrzA/Sfrp-1, a secreted frizzled-related protein and antagonist for the wnt/frizzled pathway. We assessed the hypothesis that FrzA protects cardiomyocytes from H2O2-Induced Oxidative damage through the inhibition of Wnt/Frizzled pathway activity. Methods We used a recombinant AAV9 vector to deliver FrzA gene into neonatal rat ventricle myocytes and developed an oxidative stress model using H2O2. The cell vitality was measured by MTT colorimetric assay. Western blot and RT-PCR were used to evaluate the expressions of Dvl-1, β-catenin, c-Myc, Bax and Bcl-2. Flow cytometry analysis of cardiomyocytes apoptosis. Results We confirmed that Wnt/frizzled pathway is involved in H2O2-induced apoptosis in cardiomyocytes. Compared with controls, H2O2 induced the upregulation of Dvl-1, β-catenin, and c-Myc. FrzA suppressed the expression of Dvl-1, β-catenin, c-Myc and the activity of the Wnt/frizzled pathway. Furthermore, FrzA over-expression decreased the apoptotic rate, and the Bax/Bcl-2 ratio in cardiomyocytes treated with H2O2. Conclusions FrzA, through the inhibition of Wnt/Frizzled pathway activity reduced H2O2-induced cardiomyocytes apoptosis and could be a potential therapeutic target for prevention of cardiac oxidative damage.
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Zhang GF, Zhang Y, Zhao G. Crocin protects PC12 cells against MPP(+)-induced injury through inhibition of mitochondrial dysfunction and ER stress. Neurochem Int 2015. [PMID: 26209153 DOI: 10.1016/j.neuint.2015.07.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The molecular machinery that mediates neuronal injury in neurodegenerative conditions such as Parkinson's disease (PD) remains to be fully deciphered, which will hopefully provide novel therapeutic targets for these disorders. Crocin, one of the water-soluble carotenoids isolated from the Crocus sativus L (saffron) stigma, has been reported to exert therapeutic potential in many disease models. Here, we establish an in vitro PD model using 1-methyl-4-phenylpyridinium (MPP(+))-injured PC12 cells to investigate the protective effects of crocin. Crocin treatment significantly attenuated MPP(+)-induced cell injury and apoptosis with little toxicity, and these protective effects were still observed even if crocin treatment was delayed to 6 h after injury. Crocin also inhibited MPP(+)-induced mitochondrial dysfunction, as evidenced by preservation of mitochondrial membrane potential (MMP) and ATP synthesis, which correlates with suppressed endoplasmic reticulum (ER) stress through inhibiting ER chaperone and ER related apoptotic factors. In addition, ER calcium release and morphological changes in ER lumen after MPP(+) exposure were all partially prevented by crocin. By using specific targeted small interfering RNA (siRNA) to knockdown the expression of the C/EBP homologous protein (CHOP), we found that crocin-induced protection and inhibition of ER stress was mediated by inverting MPP(+)-induced decrease of Wnt through the CHOP pathway. Our study demonstrates a pivotal role of ER stress in mediating PD related neuronal injury via the regulation of CHOP-Wnt pathway, and suggests the therapeutic values of crocin against ER stress-associated cytotoxicity.
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Affiliation(s)
- Guo-Feng Zhang
- Department of Neurology, Chinese People's Liberation Army The Fourth Military Medical University First Affiliated Hospital, Xi'an, Shaanxi 710032, China
| | - Yi Zhang
- Intensive Care Unit, ICU, Shaanxi People's Hospital, Xi'an, Shaanxi 710068, China
| | - Gang Zhao
- Department of Neurology, Chinese People's Liberation Army The Fourth Military Medical University First Affiliated Hospital, Xi'an, Shaanxi 710032, China.
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Activation of volume-sensitive outwardly rectifying chloride channel by ROS contributes to ER stress and cardiac contractile dysfunction: involvement of CHOP through Wnt. Cell Death Dis 2014; 5:e1528. [PMID: 25412307 PMCID: PMC4260737 DOI: 10.1038/cddis.2014.479] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 09/30/2014] [Accepted: 10/02/2014] [Indexed: 12/21/2022]
Abstract
Endoplasmic reticulum (ER) stress occurring in stringent conditions is critically involved in cardiomyocytes apoptosis and cardiac contractile dysfunction (CCD). However, the molecular machinery that mediates cardiac ER stress and subsequent cell death remains to be fully deciphered, which will hopefully provide novel therapeutic targets for these disorders. Here, we establish tunicamycin-induced model of cardiomyocyte ER stress, which effectively mimicks pathological stimuli to trigger CCD. Tunicamycin activates volume-sensitive outward rectifying Cl− currents. Blockade of the volume-sensitive outwardly rectifying (VSOR) Cl− channel by 4,4'-diisothiocya-natostilbene-2,2'-disulfonic acid (DIDS), a non-selective Cl− channel blocker, and 4-(2-butyl-6,7-dichlor-2-cyclopentyl-indan-1-on-5-yl) oxybutyric acid (DCPIB), a selective VSOR Cl− channel blocker, improves cardiac contractility, which correlates with suppressed ER stress through inhibiting the canonical GRP78/eIF2α/ATF4 and XBP1 pathways, and promotes survival of cardiomyocytes by inverting tunicamycin-induced decrease of Wnt through the CHOP pathway. VSOR activation of tunicamycin-treated cardiomyocytes is attributed to increased intracellular levels of reactive oxygen species (ROS). Our study demonstrates a pivotal role of ROS/VSOR in mediating ER stress and functional impairment of cardiomyocytes via the CHOP-Wnt pathway, and suggests the therapeutic values of VSOR Cl− channel blockers against ER stress-associated cardiac anomalies.
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Zhao HD, Sun MN, Li MD, Li FL, Li H. Dishevelled-1 (Dvl-1) protein: a potential participant of oxidative stress induced by selenium deficiency. Biol Trace Elem Res 2014; 157:45-50. [PMID: 24234591 DOI: 10.1007/s12011-013-9859-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 10/31/2013] [Indexed: 12/18/2022]
Abstract
Oxidative stress induced by selenium deficiency has been shown to be associated with cardiovascular diseases. Nevertheless, the mechanism associated with oxidative stress induced by selenium deficiency is poorly understood. In the present study, 36 weaning C57BL/6 mice were randomly divided into 4 groups as follows: control (n =9), 4-week selenium deficiency (n =9), 8-week selenium deficiency (n = 9), and 12-week selenium deficiency (n =9). The levels of myocardial glutathione peroxidase (GPx), superoxide dismutase (SOD), and malondialdehyde (MDA) were determined by Western blotting or commercial kits. Real-time PCR was performed to detect the mRNA expression of dishevelled-1 (Dvl-1) protein. Western blotting was conducted to evaluate the protein expression levels of Dvl-1 and β-catenin. Our results demonstrated that the levels of GPx and SOD were significantly reduced, along with an increase in MDA in selenium-deficient mice. Importantly, Dvl-1 and β-catenin were clearly upregulated under oxidative stress. Collectively, our findings indicate that Dvl-1 may be an underlying participant of oxidative stress induced by selenium deficiency.
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