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Loureirin C and Xanthoceraside Prevent Abnormal Behaviors Associated with Downregulation of Brain Derived Neurotrophic Factor and AKT/mTOR/CREB Signaling in the Prefrontal Cortex Induced by Chronic Corticosterone Exposure in Mice. Neurochem Res 2022; 47:2865-2879. [DOI: 10.1007/s11064-022-03694-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 06/27/2022] [Accepted: 07/14/2022] [Indexed: 11/27/2022]
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Hyun SA, Lee YJ, Jang S, Ko MY, Lee CY, Cho YW, Yun YE, Lee BS, Seo JW, Moon KS, Ka M. Adipose stem cell-derived extracellular vesicles ameliorates corticosterone-induced apoptosis in the cortical neurons via inhibition of ER stress. Stem Cell Res Ther 2022; 13:110. [PMID: 35313975 PMCID: PMC8935810 DOI: 10.1186/s13287-022-02785-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 01/03/2022] [Indexed: 12/29/2022] Open
Abstract
Background Corticosterone (CORT) can induce neuronal damage in various brain regions, including the cerebral cortex, the region implicated in depression. However, the underlying mechanisms of these CORT-induced effects remain poorly understood. Recently, many studies have suggested that adipose stem cell-derived extracellular vesicles (A-EVs) protect neurons in the brain.
Methods To investigated neuroprotection effects of A-EVs in the CORT-induced cortical neurons, we cultured cortical neurons from E15 mice for 7 days, and the cultured cortical neurons were pretreated with different numbers (5 × 105–107 per mL) of A-EVs (A-EVs5, A-EVs6, A-EVs7) for 30 min followed by administration of 200 μM CORT for 24 h. Results Here, we show that A-EVs exert antiapoptotic effects by inhibiting endoplasmic reticulum (ER) stress in CORT-induced cortical neurons. We found that A-EVs prevented neuronal cell death induced by CORT in cultured cortical neurons. More importantly, we found that CORT exposure in cortical neurons resulted in increased levels of apoptosis-related proteins such as cleaved caspase-3. However, pretreatment with A-EVs rescued the levels of caspase-3. Intriguingly, CORT-induced apoptosis involved upstream activation of ER stress proteins such as GRP78, CHOP and ATF4. However, pretreatment with A-EVs inhibited ER stress-related protein expression. Conclusion Our findings reveal that A-EVs exert antiapoptotic effects via inhibition of ER stress in CORT-induced cell death.
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Affiliation(s)
- Sung-Ae Hyun
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Young Ju Lee
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Sumi Jang
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Moon Yi Ko
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Chang Youn Lee
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Yong Woo Cho
- Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, 15588, Republic of Korea
| | - Ye Eun Yun
- Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, 15588, Republic of Korea
| | - Byoung-Seok Lee
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Joung-Wook Seo
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea
| | - Kyoung-Sik Moon
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea.
| | - Minhan Ka
- Department of Advanced Toxicology Research, Korea Institute of Toxicology, KRICT, Daejeon, 34114, Republic of Korea.
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Taneja G, Chu C, Maturu P, Moorthy B, Ghose R. Role of c-Jun-N-Terminal Kinase in Pregnane X Receptor-Mediated Induction of Human Cytochrome P4503A4 In Vitro. Drug Metab Dispos 2018; 46:397-404. [PMID: 29440179 DOI: 10.1124/dmd.117.079160] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 02/01/2018] [Indexed: 12/17/2022] Open
Abstract
Cytochrome P450 CYP3A4 is the most abundant drug-metabolizing enzyme and is responsible for the metabolism of ∼50% of clinically available drugs. Induction of CYP3A4 impacts the disposition of its substrates and leads to harmful clinical consequences, such as failure of therapy. To prevent such undesirable consequences, the molecular mechanisms of regulation of CYP3A4 need to be fully understood. CYP3A4 induction is regulated primarily by the xenobiotic nuclear receptor pregnane-X receptor (PXR). After ligand binding, PXR is translocated to the nucleus, where it binds to the CYP3A4 promoter and induces its gene expression. PXR function is modulated by phosphorylation(s) by multiple kinases. In this study, we determined the role of the c-Jun N-terminal kinase (JNK) in PXR-mediated induction of CYP3A4 enzyme in vitro. Human liver carcinoma cells (HepG2) were transfected with CYP3A4 luciferase and PXR plasmids, followed by treatment with JNK inhibitor (SP600125; SP) and PXR activators rifampicin (RIF) or hyperforin. Our results indicate that SP treatment significantly attenuated PXR-mediated induction of CYP3A4 reporter activity, as well as gene expression and enzyme activity. JNK knockdown by siRNA (targeting both JNK 1 and 2) also attenuated CYP3A4 induction by RIF. Interestingly, SP treatment attenuated JNK activation by RIF. Furthermore, treatment with RIF increased PXR nuclear levels and binding to the CYP3A4 promoter; SP attenuated these effects. This study shows that JNK is a novel mechanistic regulator of CYP3A4 induction by PXR.
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Affiliation(s)
- Guncha Taneja
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston (G.T., R.G.), and Department of Pediatrics, Baylor College of Medicine (C.C., P.M., B.M.), Houston, Texas
| | - Chun Chu
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston (G.T., R.G.), and Department of Pediatrics, Baylor College of Medicine (C.C., P.M., B.M.), Houston, Texas
| | - Paramahamsa Maturu
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston (G.T., R.G.), and Department of Pediatrics, Baylor College of Medicine (C.C., P.M., B.M.), Houston, Texas
| | - Bhagavatula Moorthy
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston (G.T., R.G.), and Department of Pediatrics, Baylor College of Medicine (C.C., P.M., B.M.), Houston, Texas
| | - Romi Ghose
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston (G.T., R.G.), and Department of Pediatrics, Baylor College of Medicine (C.C., P.M., B.M.), Houston, Texas
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Involvement of PI3K/Akt/FoxO3a and PKA/CREB Signaling Pathways in the Protective Effect of Fluoxetine Against Corticosterone-Induced Cytotoxicity in PC12 Cells. J Mol Neurosci 2016; 59:567-78. [DOI: 10.1007/s12031-016-0779-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Accepted: 06/17/2016] [Indexed: 12/19/2022]
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Apelin-13 Protects PC12 Cells from Corticosterone-Induced Apoptosis Through PI3K and ERKs Activation. Neurochem Res 2016; 41:1635-44. [PMID: 26961889 DOI: 10.1007/s11064-016-1878-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 02/22/2016] [Accepted: 02/24/2016] [Indexed: 01/24/2023]
Abstract
It is widely accepted that environmental stress is a risk factor for mental disorders. Glucocorticoid hormones play a vital role in the regulation of physiological response to stress. High concentrations of corticosterone can induce cellular damage in PC12 cells, which possess typical neuronal features. Apelin and its receptor APJ are widely distributed in the central nervous system including limbic structures involved in stress responses. Previous studies have suggested that apelin has a neuroprotective function. However, the effect of apelin on corticosterone-induced neuronal damage remains to be elucidated. In the present study, we explored the potential protective activity of apelin-13 in PC12 cells treated with corticosterone and its underling mechanisms. The viability of the cells, the apoptosis of the cells, the level of phosphorylation of Akt (p-Akt) and extracellular signal-regulated kinases (p-ERKs) and cleaved caspase-3 expression were detected by MTT, Hoechst staining and flow cytometer assays and Western blotting. Results showed that corticosterone induced cells viability loss, cell apoptosis, down-regulation of p-Akt and p-ERKs and up-regulation of cleaved caspase-3. The effects induced by corticosterone were attenuated by apelin-13 pretreatment. Furthermore, apelin-13-mediated anti-viability loss, antiapoptosis and caspase-3 suppression activities were blocked by specific inhibitors of phosphatidylinositol 3-kinase (PI3K) (LY294002) and ERKs (PD98059). The data suggest that apelin-13 protects PC12 cells from corticosterone-induced apoptosis through activating PI3K/Akt and ERKs signaling pathways.
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The role of Akt/FoxO3a in the protective effect of venlafaxine against corticosterone-induced cell death in PC12 cells. Psychopharmacology (Berl) 2013; 228:129-41. [PMID: 23494228 DOI: 10.1007/s00213-013-3017-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 02/01/2013] [Indexed: 01/04/2023]
Abstract
RATIONALE Antidepressants could exert neuroprotective effects against various insults and the antidepressant-like effect may result from its neuroprotective effects. The phosphatidylinositol-3-kinase/protein kinase B/Forkhead box O3 (PI3K/Akt/FoxO3a) pathway is a key signaling pathway in mediating cell survival. However, no information is available regarding the interaction of FoxO3a and antidepressants. OBJECTIVES PC12 cells treated with corticosterone were used as a model to study the protective effect of venlafaxine and underlying mechanisms. METHODS Methyl thiazolyl tetrazolium (MTT) assay, Hoechst staining, and the observation of FoxO3a subcellular location were used to study the protective effect of venlafaxine against cell damage caused by corticosterone. Pretreatments with various pathway inhibitors were used to investigate the possible pathways involved in the protection of venlafaxine. The phosphorylation of Akt and FoxO3a was analyzed by Western blot. RESULTS Corticosterone decreased the phosphorylation of Akt and FoxO3a and led to the nuclear localization of FoxO3a and the apoptosis of PC12 cells. Venlafaxine concentration-dependently protected PC12 cells against corticosterone. The protective effect of venlafaxine was reversed by LY294002 and wortmannin, two PI3K inhibitors, and Akt inhibitor VIII, whereas mitogen-activated protein kinase kinase (MAPK kinase) inhibitor PD98059 and the p38 MAPK inhibitor PD160316 had no effect. Western blot analyses showed that venlafaxine induced the phosphorylation of Akt and FoxO3a by the PI3K/Akt pathway and reversed the reduction of the phosphorylated Akt and FoxO3a, and the nuclear translocation of Foxo3a induced by corticosterone. CONCLUSIONS Venlafaxine protects PC12 cells against corticosterone-induced cell death by modulating the activity of the PI3K/Akt/FoxO3a pathway.
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Tie L, Lu N, Pan XY, Pan Y, An Y, Gao JW, Lin YH, Yu HM, Li XJ. Hypoxia-induced up-regulation of aquaporin-1 protein in prostate cancer cells in a p38-dependent manner. Cell Physiol Biochem 2012; 29:269-80. [PMID: 22415096 DOI: 10.1159/000337608] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/28/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Aquaporin-1 (AQP1) is a glycoprotein that mediates osmotic water transport, its expression has been found to correlate with tumour stage in some tumours. However, the mechanism by which AQP1 protein expression is regulated in tumor cells remains to be fully elucidated. We hypothesized that hypoxia might play an important role in AQP1 induction during tumorigenesis and at the late stages of tumor development. METHODS Isotonic and serum-free hypoxic models were used to investigate AQP1 expression in PC-3M human prostate cancer cells. RESULTS AQP1 expression was up-regulated by density-induced pericellular hypoxia and cobalt(II) chloride (CoCl(2))-induced hypoxia at the transcriptional level. Moreover, phosphorylation of p38 mitogen-activated protein kinase (MAPK) was induced by density-induced pericellular hypoxia and CoCl(2)-induced hypoxia, specific inhibitors of p38 MAPK could concentration-dependently block those effects of hypoxia on AQP1 expression. Intracellular calcium ion (Ca(2+)) and protein kinase C (PKC) were shown to be responsible for the activation of p38 MAPK pathway. In addition, AQP1 induction in dense cultures was dependent on lowered oxygen (O(2)) tension. In high cell density culture, certain secretory proteins might induce AQP1 expression indirectly. CONCLUSION These findings suggest that AQP1 could be induced by hypoxia at transcription level, and the regulation of AQP1 in PC-3M cells is dependent on calcium, PKC and p38 MAPK, as well as low oxygen tension.
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Affiliation(s)
- Lu Tie
- State Key Laboratory of Natural & Biomimetic Drugs, Department of Pharmacology, School of Basic Medical Sciences and Institute of System Biomedicine, Peking University, Beijing, China
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Guo H, Mi Z, Bowles DE, Bhattacharya SD, Kuo PC. Osteopontin and protein kinase C regulate PDLIM2 activation and STAT1 ubiquitination in LPS-treated murine macrophages. J Biol Chem 2010; 285:37787-96. [PMID: 20889505 DOI: 10.1074/jbc.m110.161869] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The molecular pathways regulating signal transducer and activator of transcription 1 (STAT1) levels in states of inflammation are incompletely understood. The suppressor of cytokine signaling, protein inhibitor of STAT, and SHP-1/2 tyrosine phosphatases ultimately regulate activity of STAT molecules. However, these mechanisms do not degrade STAT proteins. In this regard, using a murine macrophage model of LPS stimulation, we previously demonstrated that osteopontin (OPN) increased STAT1 ubiquitination and 26 S proteasome degradation via the ubiquitin E3 ligase, PDLIM2. In this study, we further characterize OPN-dependent activation of PDLIM2 in a model of LPS-stimulated RAW264.7 murine macrophages. We identify serine 137 as a protein kinase C-phosphorylation site in PDLIM2 that is required for ubiquitination of STAT1. PDLIM2 phosphorylation requires OPN expression. Using phospho-mutants and phospho-mimetic constructs of PDLIM2, our in vivo and in vitro ubiquitination studies confirm the role of PDLIM2 in formation and degradation of Ub-STAT1. The functional consequences of PDLIM2-mediated STAT1 degradation were confirmed using an IFN-γ-regulated transcription factor STAT1α reporter construct and chromatin immunoprecipitation assay for the inducible nitric-oxide synthase promoter. In a murine cecal ligation and puncture model of sepsis in wild-type and OPN (-/-) animals, OPN was necessary for PDLIM2 serine phosphorylation and STAT1 ubiquitination in bone marrow macrophages. We conclude that OPN and PDLIM2 are important regulators of STAT1-mediated inflammatory responses.
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Affiliation(s)
- Hongtao Guo
- Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA
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