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Zhong Z, Chen A, Fa Z, Ding Z, Xie J, Sun Y, Zhang R, Wang Q. Adipose-Derived Stem Cells Modulate BV2 Microglial M1/M2 Polarization by Producing GDNF. Stem Cells Dev 2020; 29:714-727. [PMID: 32111146 DOI: 10.1089/scd.2019.0235] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Affiliation(s)
- Zhenzhong Zhong
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Ao Chen
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Zhiqiang Fa
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Zhiquan Ding
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Jiayu Xie
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Yujia Sun
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Run Zhang
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Qinghua Wang
- Department of Neurosurgery, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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Zhou Y, Zhu X, Wang X, Peng Y, Du J, Yin H, Yang H, Ni X, Zhang W. H 2S alleviates renal injury and fibrosis in response to unilateral ureteral obstruction by regulating macrophage infiltration via inhibition of NLRP3 signaling. Exp Cell Res 2019; 387:111779. [PMID: 31846625 DOI: 10.1016/j.yexcr.2019.111779] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 10/25/2022]
Abstract
Renal fibrosis is a key pathological feature in chronic kidney diseases (CKDs). Dysregulation of hydrogen sulfide (H2S) homeostasis is implicated in the pathogenesis of CKDs. Here, C57/BL6 mice were allocated to Sham and unilateral ureteral obstruction (UUO) groups, which were treated with NaHS or NLRP3 inflammasome inhibitor 16673-34-0 for 3-14 days. UUO mice displayed downregulation of H2S production and increased macrophage infiltration in obstructed kidneys. H2S donor NaHS treatment attenuated renal damage and fibrosis and inhibited M1 and M2 macrophage infiltration. NLPR3 inflammasome was activated and levels of phosphorylated nuclear factor κB (NF-κB) p65 subunit, phosphorylated signal transducer and activator of transcription 6 (STAT6) and interleukin (IL)-4 protein were increased in the kidneys after UUO. NLRP3 inhibitor inactivated NF-κB and IL-4/STAT6 signaling, suppressed M1 and M2 macrophage infiltration and attenuated renal damage and fibrosis in UUO mice. NaHS treatment also suppressed NLRP3, NF-κB and IL-4/STAT6 activation in the obstructed kidneys. In conclusion, the therapeutic effects of H2S on UUO-induced renal injury and fibrosis are at least in part by inhibition of M1 and M2 macrophage infiltration. H2S suppresses NLRP3 activation and subsequently inactivates NF-κB and IL-4/STAT6 signaling, which may contribute to the anti-inflammatory and anti-fibrotic effects of H2S.
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Affiliation(s)
- Yueyuan Zhou
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xiaoyan Zhu
- Department of Physiology, Second Military Medical University, Shanghai, China
| | - Xuan Wang
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yi Peng
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jiankui Du
- National International Joint Research Center for Medical Metabolomics, Xiangya Hospital, Central South University, Changsha, Hunan, China; Department of Physiology, Second Military Medical University, Shanghai, China
| | - Hongling Yin
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hui Yang
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xin Ni
- National International Joint Research Center for Medical Metabolomics, Xiangya Hospital, Central South University, Changsha, Hunan, China; Department of Physiology, Second Military Medical University, Shanghai, China.
| | - Weiru Zhang
- Department of Rheumatology and Immunology, Xiangya Hospital, Central South University, Changsha, Hunan, China.
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You M, Miao Z, Pan Y, Hu F. Trans-10-hydroxy-2-decenoic acid alleviates LPS-induced blood-brain barrier dysfunction by activating the AMPK/PI3K/AKT pathway. Eur J Pharmacol 2019; 865:172736. [DOI: 10.1016/j.ejphar.2019.172736] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 10/10/2019] [Accepted: 10/11/2019] [Indexed: 12/20/2022]
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Liu B, Huang B, Hu G, He D, Li Y, Ran X, Du J, Fu S, Liu D. Isovitexin-Mediated Regulation of Microglial Polarization in Lipopolysaccharide-Induced Neuroinflammation via Activation of the CaMKKβ/AMPK-PGC-1α Signaling Axis. Front Immunol 2019; 10:2650. [PMID: 31798583 PMCID: PMC6868066 DOI: 10.3389/fimmu.2019.02650] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 10/25/2019] [Indexed: 01/06/2023] Open
Abstract
Microglia are the brain's immune cells and play an important role in regulating the microenvironment in the central nervous system. Activated microglia are capable of acquiring the pro-inflammatory (M1) phenotype and anti-inflammatory (M2) phenotype. Overactivation of microglia is neurotoxic and may lead to neuroinflammatory brain disorders. Neuroinflammation in the brain plays a crucial role part in the pathophysiology of many psychiatric and neurological diseases. The inhibition of M1 microglia and promotion of M2 microglia was demonstrated to treat and prevent these diseases through reduced neuroinflammation. Isovitexin (IVX) has anti-inflammatory properties and passes through the blood-brain barrier; however, the molecular mechanism that modulates IVX-mediated microglial polarization remains unclear. In BV-2 cells and mouse primary microglia, IVX suppressed the expression of M1 microglial markers, enhanced the expression of M2 microglial markers, and enhanced the release of interleukin 10 (IL-10). IVX promoted the expression of peroxisome proliferator-activated receptor-γ (PPARγ) and PPARγ coactivator-1α (PGC-1α) in LPS-induced microglial activation. The inhibition of PPARγ and PGC-1α attenuated the regulatory effect of IVX in LPS-induced microglial polarization. IVX increased the expression of p-CaMKKβ, p-AMPK, and PGC-1α in BV-2 cells. Inhibition of CaMKKβ with STO-609 or knockdown of CaMKKβ with CaMKKβ siRNA attenuated IVX-mediated M2 microglial polarization in LPS-treated cells. In LPS-treated mice, the inhibition of CaMKKβ and PGC-1α attenuated the IVX-mediated prevention of sickness behavior and enhanction of IVX-mediated M2 microglial polarization. IVX promoted M2 microglial polarization which exerted anti-inflammatory effects on LPS-induced neuroinflammation via the activation of the CaMKKβ/AMPK-PGC-1α signaling axis.
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Affiliation(s)
- Bingrun Liu
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China.,Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, Villigen, Switzerland
| | - Bingxu Huang
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Guiqiu Hu
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Dewei He
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Yuhang Li
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Xin Ran
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Jian Du
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Shoupeng Fu
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Dianfeng Liu
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
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Velagapudi R, Jamshaid F, Lepiarz I, Katola FO, Hemming K, Olajide OA. The tiliroside derivative, 3-O-[(E)-(2-oxo-4-(p-tolyl) but-3-en-1-yl] kaempferol produced inhibition of neuroinflammation and activation of AMPK and Nrf2/HO-1 pathways in BV-2 microglia. Int Immunopharmacol 2019; 77:105951. [PMID: 31634788 DOI: 10.1016/j.intimp.2019.105951] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 09/24/2019] [Accepted: 09/30/2019] [Indexed: 12/21/2022]
Abstract
Neuroinflammation is now widely accepted as an important pathophysiological mechanism in neurodegenerative disorders, thus providing a critical target for novel compounds. In this study, 3-O-[(E)-(2-oxo-4-(p-tolyl)but-3-en-1-yl] kaempferol (OTBK) prevented the production of pro-inflammatory mediators TNFα, IL-6, PGE2 and nitrite from BV-2 microglia activated with LPS and IFNγ. These effects were accompanied by reduction in the levels of pro-inflammatory proteins COX-2 and iNOS. Involvement of NF-κB in the anti-inflammatory activity of OTBK was evaluated in experiments showing that the compound prevented phosphorylation, nuclear accumulation and DNA binding of p65 sub-unit induced by stimulation of BV-2 microglia with LPS and IFNγ. Exposure of mouse hippocampal HT22 neurons to conditioned media from LPS + IFNγ-stimulated BV-2 cells resulted in reduced cell viability and generation of cellular reactive oxygen species. Interestingly, conditioned media from LPS/IFNγ-stimulated BV-2 cells which were treated with OTBK did not induce neuronal damage or oxidative stress. OTBK was shown to increase protein levels of phospho-AMPKα, Nrf2 and HO-1 in BV-2 microglia. It was further revealed that OTBK treatment increased Nrf2 DNA binding in BV-2 microglia. The actions of the compound on AMPKα and Nrf2 were shown to contribute to its anti-inflammatory activity as demonstrated by diminished activity in the presence of the AMPK antagonist dorsomorphin and Nrf2 inhibitor trigonelline. These results suggest that OTBK inhibits neuroinflammation through mechanisms that may involve activation of AMPKα and Nrf2 in BV-2 microglia.
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Affiliation(s)
- Ravikanth Velagapudi
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, United Kingdom; Center for Translational Pain Medicine, Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA(1)
| | - Faisal Jamshaid
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, United Kingdom; 1018 Liaohe Road, Xinbei Zone, Changzhou, Jiangsu, China(1)
| | - Izabela Lepiarz
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, United Kingdom
| | - Folashade O Katola
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, United Kingdom
| | - Karl Hemming
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, United Kingdom
| | - Olumayokun A Olajide
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield, United Kingdom.
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Saito M, Saito M, Das BC. Involvement of AMP-activated protein kinase in neuroinflammation and neurodegeneration in the adult and developing brain. Int J Dev Neurosci 2019; 77:48-59. [PMID: 30707928 PMCID: PMC6663660 DOI: 10.1016/j.ijdevneu.2019.01.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 12/29/2018] [Accepted: 01/28/2019] [Indexed: 02/07/2023] Open
Abstract
Microglial activation followed by neuroinflammation is a defense mechanism of the brain to eliminate harmful endogenous and exogenous materials including pathogens and damaged tissues, while excessive or chronic neuroinflammation may cause or exacerbate neurodegeneration observed in brain injuries and neurodegenerative diseases. Depending on conditions/environments during activation, microglia acquire distinct phenotypes, such as pro-inflammatory, anti-inflammatory, and disease-associated phenotypes, and show their ability to phagocytose various objects and produce pro-and anti-inflammatory mediators. Prevention of excessive inflammation by regulating the microglia's pro/anti-inflammatory balance is important for alleviating progression of brain injuries and diseases. Among many factors involved in the regulation of microglial phenotypes, cellular energy status plays an important role. Adenosine monophosphate-activated protein kinase (AMPK), which serves as a master sensor and regulator of energy balance, is considered a candidate molecule. Accumulating evidence from adult rodent studies indicates that AMPK activation promotes anti-inflammatory responses in microglia exposed to danger signals or various stressors mainly through inhibition of the nuclear factor κB (NF-κB) signaling and activation of the nuclear factor erythroid-2-related factor-2 (Nrf2) pathway. However, AMPK activation in neurons exposed to stressors/insults may exacerbate neuronal damage if AMPK activation is excessive or prolonged. While AMPK affects microglial activation states and neuronal cell survival rates in both the adult and the developing brain, studies in the developing brain are still scarce, even though activated AMPK is highly expressed especially in the neonatal brain. More in depth studies in the developing brain are important, because neuroinflammation/neurodegeneration occurred during development can result in long-lasting brain damage.
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Affiliation(s)
- Mariko Saito
- Division of Neurochemistry, Nathan S. Kline Institute for Psychiatric Research 140 Old Orangeburg, Orangeburg, NY 10962, USA
- Department of Psychiatry, New York University Langone Medical Center 550 First Avenue, New York, NY 10016, USA
| | - Mitsuo Saito
- Division of Analytical Psychopharmacology, Nathan S. Kline Institute for Psychiatric Research 140 Old Orangeburg, Orangeburg, NY 10962, USA
| | - Bhaskar C. Das
- Departments of Medicine and Pharmacological Sciences, Icahn School of Medicine at Mount Sinai 1468 Madison Avenue, Annenberg 19-201, New York, NY 10029, USA
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Deitersen J, El-Kashef DH, Proksch P, Stork B. Anthraquinones and autophagy - Three rings to rule them all? Bioorg Med Chem 2019; 27:115042. [PMID: 31420258 DOI: 10.1016/j.bmc.2019.115042] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 06/27/2019] [Accepted: 08/06/2019] [Indexed: 12/18/2022]
Abstract
In order to overcome therapy resistance in cancer, scientists search in nature for novel lead structures for the development of improved chemotherapeutics. Anthraquinones belong to a class of tricyclic organic natural compounds with promising anti-cancer effects. Anthraquinone derivatives are rich in structural diversity, and exhibit pleiotropic properties, among which the modulation of autophagy seems promising in the context of overcoming cancer-therapy resistance. Among the most promising derivatives in this regard are emodin, aloe emodin, rhein, physcion, chrysophanol and altersolanol A. On the molecular level, these compounds target autophagy via different upstream pathways including the AKT/mTOR-axis and transcription of autophagy-related proteins. The role of autophagy is pro-survival as well as cell death-promoting, depending on derivatives and their cell type specificity. This review summarizes observed effects of anthraquinone derivatives on autophagy and discusses targeted pathways and crosstalks. A cumulative knowledge about this topic paves the way for further research on modes of action, and aids to find a therapeutic window of anthraquinones in cancer-therapy.
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Affiliation(s)
- Jana Deitersen
- Institute for Molecular Medicine I, Medical Faculty, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany.
| | - Dina H El-Kashef
- Institute of Pharmaceutical Biology and Biotechnology, Faculty of Mathematics and Natural Sciences, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Faculty of Mathematics and Natural Sciences, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Björn Stork
- Institute for Molecular Medicine I, Medical Faculty, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany.
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58
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Jia J, Li J, Cheng J. H 2S-based therapies for ischaemic stroke: opportunities and challenges. Stroke Vasc Neurol 2019; 4:63-66. [PMID: 31338211 PMCID: PMC6613874 DOI: 10.1136/svn-2018-000194] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 02/15/2019] [Accepted: 03/05/2019] [Indexed: 01/29/2023] Open
Abstract
Stroke is a cerebrovascular disease displaying high mortality and morbidity. Despite extensive efforts, only very few therapies are available for stroke patients as yet. Hydrogen sulfide (H2S) is thought to be a signalling molecule that is endogenously produced and plays functional roles in the central nervous system. Currently, numerous studies show that H2S impacts stroke outcomes in animal and cellular models. Here, we review the recent research regarding the effects of endogenously produced H2S as well as exogenous H2S donors on stroke pathology, focusing on the potential of H2S-based therapies in treating ischaemic stroke. We also discuss the several issues that hinder the clinical translation of H2S-based therapies from the bench. Taken together, we think that H2S-based therapies are promising strategies for treating cerebral ischaemia if we successfully address these issues.
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Affiliation(s)
- Jia Jia
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Jie Li
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University, Suzhou, Jiangsu, China
| | - Jian Cheng
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience, Soochow University, Suzhou, Jiangsu, China
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Hydrogen-rich saline promotes microglia M2 polarization and complement-mediated synapse loss to restore behavioral deficits following hypoxia-ischemic in neonatal mice via AMPK activation. J Neuroinflammation 2019; 16:104. [PMID: 31103039 PMCID: PMC6525972 DOI: 10.1186/s12974-019-1488-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 04/25/2019] [Indexed: 12/23/2022] Open
Abstract
Background Hypoxia-ischemia (HI) during the perinatal period is one of the most common causes of acute mortality and chronic neurologic morbidity. Hydrogen-rich saline (HS) treatment in neonatal mice has been reported to alleviate brain injury following HI, but the mechanisms involved are not known. Methods A modified version of the Rice-Vannucci method for the induction of neonatal HI brain injury was performed on postnatal day 7 mouse pups. Animals or BV2-cells received HS and an AMPK inhibitor at indicative time post-injury. Results In the current study, we show that HS treatment attenuated the accumulation of CD11b+/CD45high cells, suppressed HI-induced neuro-inflammation, induced microglial anti-inflammatory M2 polarization, was associated with promoting AMPK activation, and inhibited nuclear factor-κB activation as demonstrated both in vivo and in vitro. In addition, HS treatment reversed HI-induced neurological disabilities, was associated with improving damaged synapses, and restored the expression levels of synaptophysin and postsynaptic density protein 95 following HI insult. Furthermore, HI insult which increased levels of complement component C1q, C3, and C3aR1 was observed. Importantly, C1q deposited in the infarct core and lesion boundary zone following HI injury, was found to co-localize within regions of synapse loss, whereas HS treatment reversed these effects of HI on synapse loss and complement component levels. Notably, the AMPK inhibitor reversed the beneficial effects of HS as described above. Conclusions These results demonstrate that HS restored behavioral deficits after HI in neonatal mice. These beneficial effects, in part, involve promoting microglia M2 polarization and complement-mediated synapse loss via AMPK activation. Electronic supplementary material The online version of this article (10.1186/s12974-019-1488-2) contains supplementary material, which is available to authorized users.
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60
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Pang J, Peng H, Wang S, Xu X, Xu F, Wang Q, Chen Y, Barton LA, Chen Y, Zhang Y, Ren J. Mitochondrial ALDH2 protects against lipopolysaccharide-induced myocardial contractile dysfunction by suppression of ER stress and autophagy. Biochim Biophys Acta Mol Basis Dis 2019; 1865:1627-1641. [PMID: 30946956 DOI: 10.1016/j.bbadis.2019.03.015] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 03/13/2019] [Accepted: 03/28/2019] [Indexed: 12/21/2022]
Abstract
Lipopolysaccharide (LPS), an essential component of outer membrane of the Gram-negative bacteria, plays a pivotal role in myocardial anomalies in sepsis. Recent evidence depicted an essential role for mitochondrial aldehyde dehydrogenase (ALDH2) in cardiac homeostasis. This study examined the effect of ALDH2 on endotoxemia-induced cardiac anomalies. Echocardiographic, cardiac contractile and intracellular Ca2+ properties were examined. Our results indicated that LPS impaired cardiac contractile function (reduced fractional shortening, LV end systolic diameter, peak shortening, maximal velocity of shortening/relengthening, prolonged relengthening duration, oxidation of SERCA, and intracellular Ca2+ mishandling), associated with ER stress, inflammation, O2- production, increased autophagy, CAMKKβ, phosphorylated AMPK and suppressed phosphorylation of mTOR, the effects of which were significantly attenuated or negated by ALDH2. LPS promoted early endosomal formation (as evidenced by RAB4 and RAB5a), apoptosis and necrosis (MTT and LDH) while decreasing late endosomal formation (RAB7 and RAB 9), the effects were reversed by ALDH2. In vitro study revealed that LPS-induced SERCA oxidation, autophagy and cardiac dysfunction were abrogated by ALDH2 activator Alda-1, the ER chaperone TUDCA, the autophagy inhibitor 3-MA, or the AMPK inhibitor Compound C. The beneficial effect of Alda-1 against LPS was nullified by AMPK activator AICAR or rapamycin. CAMKKβ inhibition failed to rescue LPS-induced ER stress. Tunicamycin-induced cardiomyocyte dysfunction was ameliorated by Alda-1 and autophagy inhibition, the effect of which was abolished by rapamycin. These data suggested that ALDH2 protected against LPS-induced cardiac anomalies via suppression of ER stress, autophagy in a CAMKKβ/AMPK/mTOR-dependent manner.
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Affiliation(s)
- Jiaojiao Pang
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA; Department of Emergency Medicine and Chest Pain Center, Qilu Hospital of Shandong University, Jinan, Shandong 250012, China
| | - Hu Peng
- Department of Emergency, Shanghai Tenth People's Hospital, School of Medicine Tongji University, Shanghai 200072, China
| | - Shuyi Wang
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
| | - Xihui Xu
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
| | - Feng Xu
- Department of Emergency Medicine and Chest Pain Center, Qilu Hospital of Shandong University, Jinan, Shandong 250012, China
| | - Qiurong Wang
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
| | - Yuanzhuo Chen
- Department of Emergency, Shanghai Tenth People's Hospital, School of Medicine Tongji University, Shanghai 200072, China
| | - Linzi A Barton
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
| | - Yuguo Chen
- Department of Emergency Medicine and Chest Pain Center, Qilu Hospital of Shandong University, Jinan, Shandong 250012, China.
| | - Yingmei Zhang
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA; Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Fudan University Zhongshan Hospital, Shanghai 200032, China.
| | - Jun Ren
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA; Department of Cardiology, Shanghai Institute of Cardiovascular Diseases, Fudan University Zhongshan Hospital, Shanghai 200032, China.
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61
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Wang J, Wu D, Wang H. Hydrogen sulfide plays an important protective role by influencing autophagy in diseases. Physiol Res 2019; 68:335-345. [PMID: 30904008 DOI: 10.33549/physiolres.933996] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Autophagy can regulate cell growth, proliferation, and stability of cell environment. Its dysfunction can be involved in a variety of diseases. Hydrogen sulfide (H(2)S) is an important signaling molecule that regulates many physiological and pathological processes. Recent studies indicate that H(2)S plays an important protective role in many diseases through influencing autophagy, but its mechanism is not fully understood. This article reviewed the progress about the effect of H(2)S on autophagy in diseases in recent years in order to provide theoretical basis for the further research on the interaction of H(2)S and autophagy and the mechanisms involved.
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Affiliation(s)
- J Wang
- School of Basic Medical Science, Henan University, Kaifeng, Henan, China.
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62
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Zhou X, Chu X, Xin D, Li T, Bai X, Qiu J, Yuan H, Liu D, Wang D, Wang Z. L-Cysteine-Derived H 2S Promotes Microglia M2 Polarization via Activation of the AMPK Pathway in Hypoxia-Ischemic Neonatal Mice. Front Mol Neurosci 2019; 12:58. [PMID: 30914921 PMCID: PMC6421291 DOI: 10.3389/fnmol.2019.00058] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 02/15/2019] [Indexed: 12/19/2022] Open
Abstract
We have reported previously that L-cysteine-derived hydrogen sulfide (H2S) demonstrates a remarkable neuroprotective effect against hypoxia-ischemic (HI) insult in neonatal animals. Here, we assessed some of the mechanisms of this protection as exerted by L-cysteine. Specifically, we examined the capacity for L-cysteine to stimulate microglial polarization of the M2 phenotype and its modulation of complement expression in response to HI in neonatal mice. L-cysteine treatment suppressed the production of inflammatory cytokines, while dramatically up-regulating levels of anti-inflammatory cytokines in the damaged cortex. This L-cysteine administration promoted the conversion of microglia from an inflammatory M1 to an anti-inflammatory M2 phenotype, an effect which was associated with inhibiting the p38 and/or JNK pro-inflammatory pathways, nuclear factor-κB activation and a decrease in HI-derived levels of the C1q, C3a and C3a complement receptor proteins. Notably, blockade of H2S-production clearly prevented L-cysteine-mediated M2 polarization and complement expression. L-cysteine also inhibited neuronal apoptosis as induced by conditioned media from activated M1 microglia in vitro. We also show that L-cysteine promoted AMP-activated protein kinase (AMPK) activation and the AMPK inhibitor abolished these anti-apoptotic and anti-inflammatory effects of L-cysteine. Taken together, our findings demonstrate that L-cysteine-derived H2S attenuated neuronal apoptosis after HI and suggest that these effects, in part, result from enhancing microglia M2 polarization and modulating complement expression via AMPK activation.
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Affiliation(s)
- Xin Zhou
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China.,Department of Spinal Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Xili Chu
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China
| | - Danqing Xin
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China
| | - Tingting Li
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China
| | - Xuemei Bai
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China
| | - Jie Qiu
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China.,Department of Spinal Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Hongtao Yuan
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China.,Department of Medical Psychology, Shandong University School of Basic Medical Sciences, Jinan, China
| | - Dexiang Liu
- Department of Medical Psychology, Shandong University School of Basic Medical Sciences, Jinan, China
| | - Dachuan Wang
- Department of Spinal Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Zhen Wang
- Department of Physiology, Shandong University School of Basic Medical Sciences, Jinan, China
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Takata T, Tsukuda A, Tsuchiya Y, Akaike T, Watanabe Y. The active-site cysteine residue of Ca 2+/calmodulin-dependent protein kinase I is protected from irreversible modification via generation of polysulfidation. Nitric Oxide 2019; 86:68-75. [PMID: 30844494 DOI: 10.1016/j.niox.2019.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 02/14/2019] [Accepted: 02/21/2019] [Indexed: 11/30/2022]
Abstract
Ca2+/calmodulin (CaM)-dependent protein kinase (CaMK) I is activated by the phosphorylation of a crucial activation loop Thr177 by upstream kinases, CaMK kinase (CaMKK), and regulates axonal or dendritic extension and branching. Reactive sulfur species (RSS) modulate protein functions via polysulfidation of the reactive Cys residues. Here, we report that the activity of CaMKI was reversibly inhibited via its polysulfidation at Cys179 by RSS. In vitro incubation of CaMKI with the exogenous RSS donor Na2S3 resulted in a dose-dependent inhibition of the phosphorylation at Thr177 by CaMKK and inactivation of the enzymatic activity. Dithiothreitol (DTT), a small molecule reducing reagent, rescued these inhibitions. Conversely, mutated CaMKI (C179V) was resistant to the Na2S3-induced inactivation. In transfected cells expressing CaMKI, ionomycin-induced CaMKI activity was decreased upon treatment with Na2S4, whereas cells expressing mutant CaMKI (C179V) proved resistant to this treatment. A biotin-polyethylene glycol-conjugated maleimide capture assay revealed that CaMKI was a target for polysulfidation in cells. Furthermore, the polysulfidation of CaMKI protected Cys179 from its irreversible modification, known as protein succination. Thus, we propose that CaMKI was reversibly inhibited via polysulfidation of Cys179 by RSS, thereby protecting it from irreversible modification.
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Affiliation(s)
- Tsuyoshi Takata
- Department of Pharmacology, High Technology Research Center, Showa Pharmaceutical University, Machida, Tokyo, 194-8543, Japan
| | - Ayaka Tsukuda
- Department of Pharmacology, High Technology Research Center, Showa Pharmaceutical University, Machida, Tokyo, 194-8543, Japan
| | - Yukihiro Tsuchiya
- Department of Pharmacology, High Technology Research Center, Showa Pharmaceutical University, Machida, Tokyo, 194-8543, Japan
| | - Takaaki Akaike
- Department of Environmental Health Sciences and Molecular Toxicology, Graduate School of Medicine, Tohoku University, Miyagi, 980-8575, Japan
| | - Yasuo Watanabe
- Department of Pharmacology, High Technology Research Center, Showa Pharmaceutical University, Machida, Tokyo, 194-8543, Japan.
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64
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Jin MM, Wang F, Qi D, Liu WW, Gu C, Mao CJ, Yang YP, Zhao Z, Hu LF, Liu CF. A Critical Role of Autophagy in Regulating Microglia Polarization in Neurodegeneration. Front Aging Neurosci 2018; 10:378. [PMID: 30515090 PMCID: PMC6256089 DOI: 10.3389/fnagi.2018.00378] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 10/31/2018] [Indexed: 01/07/2023] Open
Abstract
Neuroinflammation and autophagy dysfunction are closely related to the development of neurodegeneration such as Parkinson’s disease (PD). However, the role of autophagy in microglia polarization and neuroinflammation is poorly understood. TNF-α, which is highly toxic to dopaminergic neurons, is implicated as a major mediator of neuroinflammation in PD. In this study, we found that TNF-α resulted in an impairment of autophagic flux in microglia. Concomitantly, an increase of M1 marker (iNOS/NO, IL-1β, and IL-6) expression and reduction of M2 marker (Arginase1, Ym1/2, and IL-10) were observed in TNF-α challenged microglia. Upregulation of autophagy via serum deprivation or pharmacologic activators (rapamycin and resveratrol) promoted microglia polarization toward M2 phenotype, as evidenced by suppressed M1 and elevated M2 gene expression, while inhibition of autophagy with 3-MA or Atg5 siRNA consistently aggravated the M1 polarization induced by TNF-α. Moreover, Atg5 knockdown alone was sufficient to trigger microglia activation toward M1 status. More important, TNF-α stimulated microglia conditioned medium caused neurotoxicity when added to neuronal cells. The neurotoxicity was further aggravated when Atg5 knockdown in BV2 cells but alleviated when microglia pretreatment with rapamycin. Activation of AKT/mTOR signaling may contribute to the changes of autophagy and inflammation as the AKT specific inhibitor perifosine prevented the increase of LC3II (an autophagic marker) in TNF-α stimulated microglia. Taking together, our results demonstrate that TNF-α inhibits autophagy in microglia through AKT/mTOR signaling pathway, and autophagy enhancement can promote microglia polarization toward M2 phenotype and inflammation resolution.
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Affiliation(s)
- Meng-Meng Jin
- Department of Neurology, Suzhou Clinical Research Center of Neurological Disease, Suzhou Municipal Hospital of Nanjing Medical University, Suzhou, China.,Department of Neurology, The Second Affiliated Hospital of Soochow University, Suzhou, China.,Department of Neurology, University Hospital Carl Gustav Carus, Technical University of Dresden, Dresden, Germany
| | - Fen Wang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, Soochow University, Suzhou, China
| | - Di Qi
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, Soochow University, Suzhou, China
| | - Wen-Wen Liu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, Soochow University, Suzhou, China
| | - Chao Gu
- Department of Neurology, The Second Affiliated Hospital of Soochow University, Suzhou, China.,Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, Soochow University, Suzhou, China
| | - Cheng-Jie Mao
- Department of Neurology, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Ya-Ping Yang
- Department of Neurology, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Zhong Zhao
- Department of Neurology, Suzhou Clinical Research Center of Neurological Disease, Suzhou Municipal Hospital of Nanjing Medical University, Suzhou, China
| | - Li-Fang Hu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, Soochow University, Suzhou, China.,Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Chun-Feng Liu
- Department of Neurology, Suzhou Clinical Research Center of Neurological Disease, Suzhou Municipal Hospital of Nanjing Medical University, Suzhou, China.,Department of Neurology, The Second Affiliated Hospital of Soochow University, Suzhou, China.,Jiangsu Key Laboratory of Neuropsychiatric Diseases, Institute of Neuroscience, Soochow University, Suzhou, China
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65
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Lazarević M, Mazzon E, Momčilović M, Basile MS, Colletti G, Petralia MC, Bramanti P, Nicoletti F, Miljković Đ. The H₂S Donor GYY4137 Stimulates Reactive Oxygen Species Generation in BV2 Cells While Suppressing the Secretion of TNF and Nitric Oxide. Molecules 2018; 23:molecules23112966. [PMID: 30441775 PMCID: PMC6278327 DOI: 10.3390/molecules23112966] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 11/07/2018] [Accepted: 11/07/2018] [Indexed: 01/11/2023] Open
Abstract
GYY4137 is a hydrogen sulfide (H2S) donor that has been shown to act in an anti-inflammatory manner in vitro and in vivo. Microglial cells are among the major players in immunoinflammatory, degenerative, and neoplastic disorders of the central nervous system, including multiple sclerosis, Parkinson’s disease, Alzheimer’s disease, and glioblastoma multiforme. So far, the effects of GYY4137 on microglial cells have not been thoroughly investigated. In this study, BV2 microglial cells were stimulated with interferon-gamma and lipopolysaccharide and treated with GYY4137. The agent did not influence the viability of BV2 cells in concentrations up to 200 μM. It inhibited tumor necrosis factor but not interleukin-6 production. Expression of CD40 and CD86 were reduced under the influence of the donor. The phagocytic ability of BV2 cells and nitric oxide production were also affected by the agent. Surprisingly, GYY4137 upregulated generation of reactive oxygen species (ROS) by BV2 cells. The effect was mimicked by another H2S donor, Na2S, and it was not reproduced in macrophages. Our results demonstrate that GYY4137 downregulates inflammatory properties of BV2 cells but increases their ability to generate ROS. Further investigation of this unexpected phenomenon is warranted.
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Affiliation(s)
- Milica Lazarević
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia.
| | - Emanuela Mazzon
- IRCCS Centro Neurolesi Bonino Pulejo, Strada Statale 113, C.da Casazza, 98124 Messina, Italy.
| | - Miljana Momčilović
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia.
| | - Maria Sofia Basile
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia.
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia 89, 95123 Catania, Italy.
| | - Giuseppe Colletti
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia 89, 95123 Catania, Italy.
| | - Maria Cristina Petralia
- IRCCS Centro Neurolesi Bonino Pulejo, Strada Statale 113, C.da Casazza, 98124 Messina, Italy.
| | - Placido Bramanti
- IRCCS Centro Neurolesi Bonino Pulejo, Strada Statale 113, C.da Casazza, 98124 Messina, Italy.
| | - Ferdinando Nicoletti
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia 89, 95123 Catania, Italy.
| | - Đorđe Miljković
- Department of Immunology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia.
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66
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8e Protects against Acute Cerebral Ischemia by Inhibition of PI3Kγ-Mediated Superoxide Generation in Microglia. Molecules 2018; 23:molecules23112828. [PMID: 30384445 PMCID: PMC6278485 DOI: 10.3390/molecules23112828] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 10/28/2018] [Accepted: 10/29/2018] [Indexed: 12/29/2022] Open
Abstract
The inflammatory response mediated by microglia plays a critical role in the progression of ischemic stroke. Phosphoinositide 3-kinase gamma (PI3Kγ) has been implicated in multiple inflammatory and autoimmune diseases, making it a promising target for therapeutic intervention. The aim of this study was to evaluate the efficacy of 8e, a hydrogen sulfide (H2S) releasing derivative of 3-n-butylphthalide (NBP), on brain damage and PI3Kγ signaling following cerebral ischemia injury. 8e significantly reduced sensorimotor deficits, focal infarction, brain edema and neural apoptosis at 72 h after transient middle cerebral artery occlusion (tMCAO). The NOX2 isoform of the NADPH oxidase family is considered a major enzymatic source of superoxide. We found that the release of superoxide, together with the expression of NOX2 subunits p47phox, p-p47phox, and the upstream PI3Kγ/AKT signaling were all down-regulated by 8e, both in the penumbral region of the rat brain and in the primary cultured microglia subjected to oxygen-glucose deprivation (OGD). With the use of siRNA and pharmacological inhibitors, we further demonstrated that 8e regulates the formation of superoxide in activated microglia through the PI3Kγ/AKT/NOX2 signaling pathway and subsequently prevents neuronal death in neighboring neurons. Our experimental data indicate that 8e is a potential candidate for the treatment of ischemic stroke and PI3Kγ-mediated neuroinflammation.
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67
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Hydrogen Sulfide Donor NaHS Improves Metabolism and Reduces Muscle Atrophy in Type 2 Diabetes: Implication for Understanding Sarcopenic Pathophysiology. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:6825452. [PMID: 30510624 PMCID: PMC6232794 DOI: 10.1155/2018/6825452] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 08/09/2018] [Accepted: 08/15/2018] [Indexed: 12/15/2022]
Abstract
Sarcopenia, a loss of muscle mass and functionality, constitutes a major contributor to disability in diabetes. Hydrogen sulfide (H2S) dynamics and muscle mass regulatory signaling were studied in GK rats, a model for type 2 diabetes (T2D). GK rats exhibited a number of features that are consistent with sarcopenia and T2D including loss of muscle mass and strength, in addition to glucose intolerance, insulin resistance, and impaired β-cell responsiveness to glucose. Mechanistically, activation levels of Akt, a key modulator of protein balance, were decreased in T2D. Consequently, we confirmed reduced activity of mTOR signaling components and higher expression of atrophy-related markers typified by FoxO1/atrogin-1/MuRF1 and myostatin-Smad2/3 signaling during the course of diabetes. We observed in GK rat reduced antioxidant capacity (↓GSH/GSSG) and increased expression and activity of NADPH oxidase in connection with augmented rate of oxidation of lipids, proteins, and DNA. H2S bioavailability and the expression of key enzymes involved in its synthesis were suppressed as a function of diabetes. Interestingly, GK rats receiving NaHS displayed increased muscle Akt/mTOR signaling and decreased expression of myostatin and the FoxO1/MuRF1/atrogin-dependent pathway. Moreover, diabetes-induced heightened state of oxidative stress was also ameliorated in response to NaHS therapy. Overall, the current data support the notion that a relationship exists between sarcopenia, heightened state of oxidative stress, and H2S deficiency at least in the context of diabetes. Moreover, treatment with a potent H2S donor at an early stage of diabetes is likely to mitigate the development of sarcopenia/frailty and predictably reduces its devastating sequelae of amputation.
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68
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Wang Y, Xu Y, Zhang P, Ruan W, Zhang L, Yuan S, Pang T, Jia AQ. Smiglaside A ameliorates LPS-induced acute lung injury by modulating macrophage polarization via AMPK-PPARγ pathway. Biochem Pharmacol 2018; 156:385-395. [PMID: 30195731 DOI: 10.1016/j.bcp.2018.09.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 09/05/2018] [Indexed: 02/09/2023]
Abstract
Macrophages, which have various phenotypes and diverse functions, are becoming the target cells in inflammatory diseases. In this study, we evaluated the effects of the natural product smiglaside A, a phenylpropanoid glycoside isolated from the traditional Chinese medicinal herb Smilax riparia, on macrophage polarization and investigated the underlying mechanisms. We found that smiglaside A promoted M2 polarization and reduced M1 polarization in LPS-stimulated RAW264.7 cells and primary mouse peritoneal macrophages. Further mechanistic studies showed that the promoting effect of smiglaside A on M2 polarization was attenuated by pharmacological inhibition or gene silencing of AMP-activated protein kinase (AMPK) or peroxisome proliferator-activated receptor γ (PPARγ). Moreover, smiglaside A-enhanced PPARγ activity was prevented by the AMPK inhibitor compound C and by an siRNA. These findings indicate that the AMPK-PPARγ pathway is involved in promotion of M2 macrophages by smiglaside A. In a mouse model of LPS-induced acute lung injury, smiglaside A significantly increased the survival rate of LPS-injected mice and ameliorated the LPS-induced inflammatory response and lung damage. In addition, smiglaside A enhanced the protein expression levels of phosphorylated AMPK and PPARγ in the lung and promoted alveolar macrophages to the M2 phenotype in this mouse model. Taken together, our results indicate that smiglaside A can promote macrophage polarization to an anti-inflammatory M2 phenotype via stimulating the AMPK-PPARγ signaling pathway. Our study may provide novel approaches and/or targets for drug development to treat inflammatory diseases such as acute lung injury and sepsis.
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Affiliation(s)
- Yurong Wang
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University, Haikou 570228, China; State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing 210009, China
| | - Yuan Xu
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, 138 Xianlin Road, Nanjing 210023, China
| | - Pingping Zhang
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University, Haikou 570228, China
| | - Wenchen Ruan
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing 210009, China
| | - Luyong Zhang
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing 210009, China
| | - Shengtao Yuan
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing 210009, China
| | - Tao Pang
- State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing 210009, China; Department of Pharmacology and Physiology, Georgetown University Medical Center, Washington, DC 20057, USA.
| | - Ai-Qun Jia
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University, Haikou 570228, China.
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69
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Saxagliptin regulates M1/M2 macrophage polarization via CaMKKβ/AMPK pathway to attenuate NAFLD. Biochem Biophys Res Commun 2018; 503:1618-1624. [DOI: 10.1016/j.bbrc.2018.07.090] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Accepted: 07/19/2018] [Indexed: 01/13/2023]
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70
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Zhou J, Lv XH, Fan JJ, Dang LY, Dong K, Gao B, Song AQ, Wu WN. GYY4137 Promotes Mice Feeding Behavior via Arcuate Nucleus Sulfur-Sulfhydrylation and AMPK Activation. Front Pharmacol 2018; 9:966. [PMID: 30186182 PMCID: PMC6111581 DOI: 10.3389/fphar.2018.00966] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/06/2018] [Indexed: 12/11/2022] Open
Abstract
Hydrogen sulfide (H2S) is an endogenous gaseous molecule and plays important biological and neurochemical roles in many processes such as the neural activity and immunity. The arcuate nucleus (ARC) of hypothalamus is a control center for appetite and energy metabolism. AMPK is a gage kinase in the monitoring of energy status and regulation of energy metabolism, and it can be activated by H2S via CaMKKβ/AMPK pathway. But the role of H2S in ARC and appetite has not been reported. Here we studied the orexigenic effect of H2S and the mechanisms by means of GYY4137, a water soluble and slow-releasing donor of H2S, and protein sulfur-sulfhydrylation analysis. We demonstrated that GYY4137-derived H2S increased food intake of mice, augmented the production of neuropeptide Y (NPY), and elevated the protein sulfur-sulfhydrylation level and the activation of AMPK and CaMKKβ in ARC. Blocking sulfur-sulfhydrylation with DTT eliminated GYY4137-induced activation of AMPK and CaMKKβ. DTT and preventing AMPK activation in ARC with Compound C and Ara-A could both attenuate the orexigenic effect of GYY4137. These findings suggest that H2S enhances appetite through protein sulfur-sulfhydrylation and the activation of AMPK and NPY function in ARC.
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Affiliation(s)
- Jun Zhou
- Department of Pharmacy, Xi'an Chest Hospital, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Xiao-Hui Lv
- Department of Pharmacy, Xi'an Chest Hospital, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Jun-Juan Fan
- Department of Pharmacology, School of Basic Medical Sciences, Key Laboratory of Anti-inflammatory and Immunopharmacology, Anhui Medical University, Hefei, China
| | - Li-Yun Dang
- Department of Pharmacy, Xi'an Chest Hospital, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Kun Dong
- Department of Pharmacology, School of Basic Medical Sciences, Key Laboratory of Anti-inflammatory and Immunopharmacology, Anhui Medical University, Hefei, China
| | - Bo Gao
- Department of Pharmacology, School of Basic Medical Sciences, Key Laboratory of Anti-inflammatory and Immunopharmacology, Anhui Medical University, Hefei, China
| | - Ao-Qi Song
- Department of Pharmacology, School of Basic Medical Sciences, Key Laboratory of Anti-inflammatory and Immunopharmacology, Anhui Medical University, Hefei, China
| | - Wen-Ning Wu
- Department of Pharmacology, School of Basic Medical Sciences, Key Laboratory of Anti-inflammatory and Immunopharmacology, Anhui Medical University, Hefei, China
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71
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Li C, Chen T, Zhou H, Feng Y, Hoi MPM, Ma D, Zhao C, Zheng Y, Lee SMY. BHDPC Is a Novel Neuroprotectant That Provides Anti-neuroinflammatory and Neuroprotective Effects by Inactivating NF-κB and Activating PKA/CREB. Front Pharmacol 2018; 9:614. [PMID: 29988625 PMCID: PMC6027181 DOI: 10.3389/fphar.2018.00614] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 05/22/2018] [Indexed: 12/31/2022] Open
Abstract
Microglia-mediated neuroinflammatory responses are inevitable and important pathological processes in several kinds of disorder of the central nervous system (CNS). Therefore, alleviating activated microglia-induced inflammatory process might be a valuable therapeutic approach to neuroinflammation-related diseases. In the present study, we investigated BHDPC, a novel neuroprotectant discovered in our previous study that had anti-inflammatory effects under neuroinflammatory conditions. First, we found that BHDPC could inhibit neuroinflammatory responses and promote microglial M2 phenotype polarization in both lipopolysaccharide (LPS)-activated BV-2 microglia l cells. Furthermore, BHDPC provided protective actions against neuroinflammation-induced neurotoxicity in HT22 mouse hippocampal cells co-cultured with activated BV-2 microglia. Further experiments demonstrated that BHDPC could suppress LPS-induced activation of transcription factor nuclear factor kappa B (NF-κB) via interfering with the degradation of the inhibitor of kappa B (IκB) and phosphorylation of IκB, the IκB kinase (IKK). Moreover, we also found that BHDPC could induce phosphorylation of cAMP-dependent protein kinase A (PKA) and cAMP-response element-binding protein (CREB) in BV-2 microglial cells. Also, using the PKA-specific inhibitor, we found that BHDPC-induced CREB phosphorylation was dependent on PKA, which also contributed to BHDPC-mediated anti-inflammation and neuroprotection.
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Affiliation(s)
- Chuwen Li
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Tongkai Chen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China.,Institute of Clinical Pharmacology, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Hefeng Zhou
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Yu Feng
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Maggie P M Hoi
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Dan Ma
- Department of Clinical Neurosciences, Wellcome Trust-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom
| | - Chao Zhao
- Department of Clinical Neurosciences, Wellcome Trust-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom
| | - Ying Zheng
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Simon M Y Lee
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
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72
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Lee SH, Suk K. Identification of glia phenotype modulators based on select glial function regulatory signaling pathways. Expert Opin Drug Discov 2018; 13:627-641. [DOI: 10.1080/17460441.2018.1465925] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Sun-Hwa Lee
- New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea
| | - Kyoungho Suk
- Department of Pharmacology, Brain Science & Engineering Institute, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
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73
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Li C, Zhang C, Zhou H, Feng Y, Tang F, Hoi MPM, He C, Ma D, Zhao C, Lee SMY. Inhibitory Effects of Betulinic Acid on LPS-Induced Neuroinflammation Involve M2 Microglial Polarization via CaMKKβ-Dependent AMPK Activation. Front Mol Neurosci 2018; 11:98. [PMID: 29666569 PMCID: PMC5891622 DOI: 10.3389/fnmol.2018.00098] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 03/13/2018] [Indexed: 11/13/2022] Open
Abstract
In response to the microenvironment, microglia may polarize into either an M1 pro-inflammatory phenotype, exacerbating neurotoxicity, or an M2 anti-inflammatory phenotype, conferring neuroprotection. Betulinic acid (BA) is a naturally pentacyclic triterpenoid with considerable anti-inflammatory properties. Here, we aim to investigate the potential effects of BA on microglial phenotype polarization and to reveal the underlying mechanisms of action. First, we confirmed that BA promoted M2 polarization and inhibited M1 polarization in lipopolysaccharide (LPS)-stimulated BV-2 microglial cells. Then, we demonstrated that the effect of BA on microglial polarization was dependent on AMP-activated protein kinase (AMPK) activation, as evidenced by the fact that both AMPK inhibitor compound C and AMPK siRNA abolished the M2 polarization promoted by BA. Moreover, we found that calmodulin-dependent protein kinase kinase β (CaMKKβ), but not liver kinase B1, was the upstream kinase required for BA-mediated AMPK activation and microglial M2 polarization, via the use of both the CaMKKβ inhibitor STO-609 and CaMKKβ siRNA. Finally, BA enhanced AMPK phosphorylation and promoted M2 microglial polarization in the cerebral cortex of LPS-injected mice brains, which was attenuated by pre-administration of the AMPK inhibitor. This study demonstrated that BA promoted M2 polarization of microglia, thus conferring anti-neuroinflammatory effects via CaMKKβ-dependent AMPK activation.
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Affiliation(s)
- Chuwen Li
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Chao Zhang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China.,School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - Hefeng Zhou
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Yu Feng
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Fan Tang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Maggie P M Hoi
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Chengwei He
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Dan Ma
- Department of Clinical Neurosciences, Wellcome Trust-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom
| | - Chao Zhao
- Department of Clinical Neurosciences, Wellcome Trust-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom
| | - Simon M Y Lee
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
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Abstract
Hydrogen sulfide (H2S) has been considered the third gaseous signaling molecule that plays important roles in a wide range of physiological and pathological conditions. However, there has been some controversy on the role of H2S in autophagy. Recent studies indicate that a number of signaling pathways are involved in the pro-autophagy effect of H2S, such as PI3K/Akt/mTOR, AMPK/mTOR, LKB1/STRAD/MO25, and miR-30c signaling pathways. On the other hand, there are many signaling pathways that play important roles in the anti-autophagy effect of H2S, including SR-A, PI3K/SGK1/GSK3β, PI3K/AKT/mTOR, Nrf2-ROS-AMPK, AMPK/mTOR, and JNK1 signaling pathways. Novel H2S-releasing donors/drugs could be designed and identified in order to increase the therapeutic effects by mediating autophagy in human diseases. In this review, the H2S metabolism in mammals is summarized and the effects of signaling pathways in H2S-mediated autophagy are further discussed.
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75
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Shefa U, Kim MS, Jeong NY, Jung J. Antioxidant and Cell-Signaling Functions of Hydrogen Sulfide in the Central Nervous System. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:1873962. [PMID: 29507650 PMCID: PMC5817206 DOI: 10.1155/2018/1873962] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/13/2017] [Accepted: 12/11/2017] [Indexed: 12/13/2022]
Abstract
Hydrogen sulfide (H2S), a toxic gaseous molecule, plays a physiological role in regulating homeostasis and cell signaling. H2S is produced from cysteine by enzymes, such as cystathionine β-synthase (CBS), cystathionine γ-lyase (CSE), cysteine aminotransferase (CAT), and 3-mercaptopyruvate sulfurtransferase (3MST). These enzymes regulate the overall production of H2S in the body. H2S has a cell-signaling function in the CNS and plays important roles in combating oxidative species such as reactive oxygen species (ROS) and reactive nitrogen species (RNS) in the body. H2S is crucial for maintaining balanced amounts of antioxidants to protect the body from oxidative stress, and appropriate amounts of H2S are required to protect the CNS in particular. The body regulates CBS, 3MST, and CSE levels in the CNS, and higher or lower levels of these enzymes cause various neurodegenerative diseases. This review discusses how H2S protects the CNS by acting as an antioxidant that reduces excessive amounts of ROS and RNS. Additionally, H2S regulates cell signaling to combat neuroinflammation and protect against central neurodegenerative diseases such as Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease (HD), and amyotrophic lateral sclerosis (ALS).
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Affiliation(s)
- Ulfuara Shefa
- Department of Biomedical Science, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Min-Sik Kim
- Department of Applied Chemistry, College of Applied Sciences, Kyung Hee University, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea
| | - Na Young Jeong
- Department of Anatomy and Cell Biology, College of Medicine, Dong-A University, 32 Daesingongwon-ro, Seo-gu, Busan 49201, Republic of Korea
| | - Junyang Jung
- Department of Biomedical Science, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
- East-West Medical Research Institute, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
- Department of Anatomy and Neurobiology, College of Medicine, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
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76
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Wang Y, Huang Y, Xu Y, Ruan W, Wang H, Zhang Y, Saavedra JM, Zhang L, Huang Z, Pang T. A Dual AMPK/Nrf2 Activator Reduces Brain Inflammation After Stroke by Enhancing Microglia M2 Polarization. Antioxid Redox Signal 2018; 28:141-163. [PMID: 28747068 DOI: 10.1089/ars.2017.7003] [Citation(s) in RCA: 155] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
AIMS Microglia-mediated neuroinflammation plays an important role in focal ischemic stroke, a disorder with no effective therapeutic agents. Since microglial polarization to the M2 phenotype and reduction of oxidative stress are mediated through AMP-activated protein kinase (AMPK) and nuclear factor erythroid 2-related factor 2 (Nrf2) activation, we assessed the dual therapeutic effect of AMPK and Nrf2 activation by a novel neuroprotectant HP-1c in the treatment of ischemic stroke. RESULTS We developed a novel class of hybrids (HP-1a-HP-1f) of telmisartan and 2-(1-hydroxypentyl)-benzoate (HPBA) as a ring-opening derivative of NBP. The most promising hybrid, HP-1c, exhibited more potent anti-inflammatory and neuroprotective effects in vitro and reduced brain infarct volume and improved neurological deficits in a rat model of transient focal cerebral ischemia when compared with telmisartan alone, NBP alone, or a combination of telmisartan and NBP. HP-1c had a therapeutic window of up to 24 h, ameliorated ischemic cerebral injury in permanent focal cerebral ischemia, and improved motor function. The beneficial effects of HP-1c in ischemic stroke were associated with microglial polarization to the M2 phenotype and reduced oxidative stress. HP-1c also shifted the M1/M2 polarization in a mouse neuroinflammatory model. The anti-inflammatory and anti-oxidative effects of HP-1c were associated with AMPK-Nrf2 pathway activation for neuroprotection. We showed that HP-1c penetrates the brain, has a plasma half-life of around 3.93 h, and has no toxicity in mice. Innovation and Conclusion: Our study results suggest that HP-1c, with dual AMPK- and Nrf2-activating properties, may have potential in further studies as a novel therapy for ischemic stroke. Antioxid. Redox Signal. 28, 141-163.
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Affiliation(s)
- Yunjie Wang
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China
| | - Yun Huang
- 2 Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, China Pharmaceutical University , Nanjing, P.R. China
| | - Yazhou Xu
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China
| | - Wenchen Ruan
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China
| | - Haojie Wang
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China
| | - Yihua Zhang
- 2 Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, China Pharmaceutical University , Nanjing, P.R. China
| | - Juan M Saavedra
- 3 Department of Pharmacology and Physiology, Georgetown University Medical Center , Washington, District of Columbia
| | - Luyong Zhang
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China
| | - Zhangjian Huang
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China .,2 Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, China Pharmaceutical University , Nanjing, P.R. China
| | - Tao Pang
- 1 State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University , Nanjing, P.R. China .,2 Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, China Pharmaceutical University , Nanjing, P.R. China .,3 Department of Pharmacology and Physiology, Georgetown University Medical Center , Washington, District of Columbia
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77
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Wang Y, Ruan W, Mi J, Xu J, Wang H, Cao Z, Saavedra JM, Zhang L, Lin H, Pang T. Balasubramide derivative 3C modulates microglia activation via CaMKKβ-dependent AMPK/PGC-1α pathway in neuroinflammatory conditions. Brain Behav Immun 2018; 67:101-117. [PMID: 28803158 DOI: 10.1016/j.bbi.2017.08.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 07/20/2017] [Accepted: 08/08/2017] [Indexed: 12/12/2022] Open
Abstract
Neuroinflammation plays a vital role in the pathological process of cerebral ischemic stroke, but currently there is no effective treatment. After ischemia, microglia-produced proinflammatory mediator expression contributes to the aggravation of neuroinflammation, while anti-inflammatory activation of microglia develops an anti-neuroinflammatory effect via secretion of anti-inflammatory factor. Promoting the anti-inflammatory activation of microglia might be an effective treatment of stroke. Previously, we discovered one derivative of the natural product (+)-balasubramide, compound 3C, that exhibits a remarkably anti-neuroinflammatory effect in vitro with unknown mechanisms. Thus in this study, we aimed to clarify its molecular mechanisms and determine whether compound 3C has a neuroprotective effect after ischemia via regulation on microglial inflammation. We found that compound 3C promoted the anti-inflammatory mediator expression and reduced the proinflammatory mediator expression in LPS-stimulated BV2 cells and mouse primary microglia cells, which were reversed by AMP-activated protein kinase (AMPK) inhibition or AMPK upstream calmodulin-dependent protein kinase kinase beta (CaMKKβ) inhibition. Compound 3C also prevented LPS-stimulated JNK activation and enhanced PGC-1α activation in microglia, which was attenuated by AMPK inhibition. Additionally, compound 3C ameliorated depressive behaviors in LPS-induced neuroinflammatory mice by promoting the anti-inflammatory activation of microglia. Furthermore, we found that compound 3C markedly reduced brain infarct volume, improved the neurological deficit in rats with ischemia and reduced the activated microglia/macrophage cells in the ischemic area, which concomitantly enhanced the anti-inflammatory mediator expression. A mechanistic study showed that the compound 3C-mediated activation of CaMKKβ, AMPK and PGC-1α is involved in the anti-neuroinflammatory and neuroprotective effects of 3C in the brain of LPS-treated mice and ischemic rats. Taken together, our results show that compound 3C could suppress neuroinflammation in vitro and in vivo by modulating microglial activation state through the CaMKKβ-dependent AMPK/PGC-1α signaling pathway, and maybe further be developed as a promising new drug candidate for the treatment of brain disorders such as stroke associated with brain inflammation.
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Affiliation(s)
- Yunjie Wang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University, Nanjing 210009, PR China
| | - Wenchen Ruan
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University, Nanjing 210009, PR China
| | - Junru Mi
- College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, PR China
| | - Jingzi Xu
- College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, PR China
| | - Haojie Wang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University, Nanjing 210009, PR China; Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, China Pharmaceutical University, Nanjing 210009, PR China
| | - Zhengyu Cao
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University, Nanjing 210009, PR China
| | - Juan M Saavedra
- Department of Pharmacology and Physiology, Georgetown University Medical Center, WA, DC 20057, USA
| | - Luyong Zhang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University, Nanjing 210009, PR China; College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, PR China
| | - Hansen Lin
- College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, PR China.
| | - Tao Pang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Screening, Jiangsu Key Laboratory of Druggability of Biopharmaceuticals, China Pharmaceutical University, Nanjing 210009, PR China; Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, China Pharmaceutical University, Nanjing 210009, PR China; Department of Pharmacology and Physiology, Georgetown University Medical Center, WA, DC 20057, USA.
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78
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Chronic N-acetylcysteine treatment alleviates acute lipopolysaccharide-induced working memory deficit through upregulating caveolin-1 and synaptophysin in mice. Psychopharmacology (Berl) 2018; 235:179-191. [PMID: 29058042 DOI: 10.1007/s00213-017-4762-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 09/27/2017] [Indexed: 12/30/2022]
Abstract
RATIONALE Working memory (WM) is a dynamic encoding process and an active representation of information over a short time. The ability to guide forthcoming behavior would be disrupted if WM was impaired by various factors including inflammation, stress, free radicals, and disease states such as schizophrenia. However, the mechanism underlying acute working memory impairment remains to be defined. OBJECTIVES In this study, we tested the hypothesis that decreased caveolin-1 (Cav-1) and synaptophysin (SYP) accounted for the WM impairment challenged with acute intraperitoneally lipopolysaccharide (LPS), which mimicked neuroinflammation. Delayed alternation T-maze task (DAT) was used to assess working memory of adult male C57BL/6 mice, and western blot and immunostaining were used to detect protein expression and distribution in medial prefrontal cortex (mPFC) and hippocampus. RESULTS Our results showed that LPS dose-dependently induced working memory deficit accompanied by the decrease of Cav-1 and SYP in mPFC but not hippocampus. In addition, LPS significantly decreased protein level of Cav-1 and SYP in neurons by activating microglia cells. More important, 2-week N-acetylcysteine (NAC) treatment dose-dependently inhibited LPS-induced working memory deficit by improving the ability to use Lose-shift but not Win-shift strategy and significantly inhibited LPS-induced downregulation of Cav-1 and SYP in mPFC. CONCLUSIONS Taken together, our findings demonstrate that chronic NAC treatment alleviates acute LPS-induced working memory deficit through upregulating Cav-1 and SYP in mice.
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79
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Park SY, Choi MH, Park G, Choi YW. Petasites japonicus bakkenolide B inhibits lipopolysaccharide‑induced pro‑inflammatory cytokines via AMPK/Nrf2 induction in microglia. Int J Mol Med 2017; 41:1683-1692. [PMID: 29286084 DOI: 10.3892/ijmm.2017.3350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 12/21/2017] [Indexed: 11/06/2022] Open
Abstract
Abnormal neuroinflammatory responses have diverse roles in neuronal death, oxidative stress and neurodegenerative diseases, such as Alzheimer's and Parkinson's disease. Microglia regulate these responses via molecular signaling cascades that involve inflammatory cytokines and complement proteins. Bakkenolide B from Petasites japonicus exhibits significant anti‑inflammatory and anti‑allergic bioactivities. The present study investigated the anti‑neuroinflammatory effects and underlying molecular mechanisms of bakkenolide B on the lipopolysaccharide (LPS)‑mediated neuroinflammatory response in microglia. The results indicated that bakkenolide B pretreatment significantly reduced microglial production of interleukin (IL)‑1β, IL‑6, IL‑12, and tumor necrosis factor (TNF)‑α. Furthermore, this effect was associated with reduced production of reactive oxygen species. The role of bakkenolide B was then evaluated in the upregulation of nuclear factor erythroid 2‑related factor 2 (Nrf2)/antioxidant response element (ARE) signaling pathways. The results suggested that bakkenolide B significantly upregulated Nrf2/ARE pathway‑related downstream factors, such as NADPH dehydrogenase quinone‑1 (NQO‑1) and heme oxygenase‑1 (HO‑1). Silencing of Nrf2, HO‑1 and NQO‑1 diminished the anti‑neuroinflammatory properties of bakkenolide B. AMP‑activated protein kinase (AMPK) activates the Nrf2/ARE signaling pathway, and the results of the present study demonstrated that bakkenolide B increased AMPK phosphorylation in microglia. In addition, an AMPK inhibitor abolished the bakkenolide B‑induced increase in nuclear Nrf2, NQO‑1 and HO‑1 protein expression. Finally, an AMPK inhibitor diminished the bakkenolide B‑mediated inhibition of LPS‑stimulated TNF‑α production. Taken together, the present results demonstrate that bakkenolide B may be an effective and therapeutically relevant AMPK/Nrf2 pathway activator for suppressing abnormal neuro-inflammation in neurodegenerative diseases.
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Affiliation(s)
- Sun Young Park
- Bio‑IT Fusion Technology Research Institute, Pusan National University, Busan, South Gyeongsang 46241, Republic of Korea
| | - Min Hyun Choi
- Department of Horticultural Bioscience, Pusan National University, Miryang, South Gyeongsang 50463, Republic of Korea
| | - Geuntae Park
- Department of Nanomaterials Engineering, Pusan National University, Busan, South Gyeongsang 46241, Republic of Korea
| | - Young-Whan Choi
- Department of Horticultural Bioscience, Pusan National University, Miryang, South Gyeongsang 50463, Republic of Korea
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80
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Kumar A, Palfrey HA, Pathak R, Kadowitz PJ, Gettys TW, Murthy SN. The metabolism and significance of homocysteine in nutrition and health. Nutr Metab (Lond) 2017; 14:78. [PMID: 29299040 PMCID: PMC5741875 DOI: 10.1186/s12986-017-0233-z] [Citation(s) in RCA: 189] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 12/07/2017] [Indexed: 12/31/2022] Open
Abstract
An association between arteriosclerosis and homocysteine (Hcy) was first demonstrated in 1969. Hcy is a sulfur containing amino acid derived from the essential amino acid methionine (Met). Hyperhomocysteinemia (HHcy) was subsequently shown in several age-related pathologies such as osteoporosis, Alzheimer's disease, Parkinson's disease, stroke, and cardiovascular disease (CVD). Also, Hcy is associated with (but not limited to) cancer, aortic aneurysm, hypothyroidism and end renal stage disease to mention some. The circulating levels of Hcy can be increased by defects in enzymes of the metabolism of Met, deficiencies of vitamins B6, B12 and folate or by feeding Met enriched diets. Additionally, some of the pharmaceuticals currently in clinical practice such as lipid lowering, and anti-Parkinsonian drugs are known to elevate Hcy levels. Studies on supplementation with folate, vitamins B6 and B12 have shown reduction in Hcy levels but concomitant reduction in certain associated pathologies have not been definitive. The enormous importance of Hcy in health and disease is illustrated by its prevalence in the medical literature (e.g. > 22,000 publications). Although there are compelling data in favor of Hcy as a modifiable risk factor, the debate regarding the significance of Hcy mediated health effects is still ongoing. Despite associations between increased levels of Hcy with several pathologies being well documented, whether it is a causative factor, or an effect remains inconclusive. The present review though not exhaustive, is focused on several important aspects of Hcy metabolism and their relevance to health.
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Affiliation(s)
- Avinash Kumar
- Environmental Toxicology Department, Southern University and A&M College, Baton Rouge, LA 70813 USA
| | - Henry A. Palfrey
- Environmental Toxicology Department, Southern University and A&M College, Baton Rouge, LA 70813 USA
| | - Rashmi Pathak
- Environmental Toxicology Department, Southern University and A&M College, Baton Rouge, LA 70813 USA
| | - Philip J. Kadowitz
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, LA USA
| | - Thomas W. Gettys
- Laboratory of Nutrient Sensing and Adipocyte Signaling, Pennington Biomedical Research Center, Baton Rouge, LA USA
| | - Subramanyam N. Murthy
- Environmental Toxicology Department, Southern University and A&M College, Baton Rouge, LA 70813 USA
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81
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Perridon BW, Leuvenink HGD, Hillebrands JL, van Goor H, Bos EM. The role of hydrogen sulfide in aging and age-related pathologies. Aging (Albany NY) 2017; 8:2264-2289. [PMID: 27683311 PMCID: PMC5115888 DOI: 10.18632/aging.101026] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Accepted: 09/13/2016] [Indexed: 12/14/2022]
Abstract
When humans grow older, they experience inevitable and progressive loss of physiological function, ultimately leading to death. Research on aging largely focuses on the identification of mechanisms involved in the aging process. Several proposed aging theories were recently combined as the 'hallmarks of aging'. These hallmarks describe (patho-)physiological processes that together, when disrupted, determine the aging phenotype. Sustaining evidence shows a potential role for hydrogen sulfide (H2S) in the regulation of aging. Nowadays, H2S is acknowledged as an endogenously produced signaling molecule with various (patho-) physiological effects. H2S is involved in several diseases including pathologies related to aging. In this review, the known, assumed and hypothetical effects of hydrogen sulfide on the aging process will be discussed by reviewing its actions on the hallmarks of aging and on several age-related pathologies.
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Affiliation(s)
- Bernard W Perridon
- Department of Pathology and Medical Biology, University Medical Center Groningen, the Netherlands
| | | | - Jan-Luuk Hillebrands
- Department of Pathology and Medical Biology, University Medical Center Groningen, the Netherlands
| | - Harry van Goor
- Department of Pathology and Medical Biology, University Medical Center Groningen, the Netherlands
| | - Eelke M Bos
- Department of Pathology and Medical Biology, University Medical Center Groningen, the Netherlands.,Department of Neurosurgery, Erasmus Medical Center Rotterdam, the Netherlands
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82
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Wang M, Tang W, Zhu YZ. An Update on AMPK in Hydrogen Sulfide Pharmacology. Front Pharmacol 2017; 8:810. [PMID: 29167642 PMCID: PMC5682294 DOI: 10.3389/fphar.2017.00810] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 10/26/2017] [Indexed: 12/25/2022] Open
Abstract
Hydrogen sulfide (H2S), the third bio-active gasotransmitter, is produced endogenously and tightly involved in the pathogenesis and treatment for various diseases. Adenosine 5′-monophosphate-activated protein kinase (AMPK) plays a paramount role in maintaining cellular energetic balance. Increasing evidences have also suggested AMPK as a novel modulator in multiple pathological conditions. In this paper, we will review the biological principles of H2S and AMPK, and most importantly, the recent discoveries regarding AMPK-mediated pharmacological actions of H2S. Emphasis will be laid on AMPK/H2S interactions in the cardiovascular system, autophagy, diabetic complications, and inflammation. In most cases described in this article, by promoting AMPK activation, H2S exerts cytoprotective effects or therapeutic potentials, though there remain some controversies before we can fully understand the involved mechanisms. Further researches are in need to investigate more closely any relationship between H2S and AMPK, and to put forward the development of H2S donors for clinical application.
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Affiliation(s)
- Minjun Wang
- Department of Pharmacology, School of Pharmacy, Macau University of Science and Technology, Macau, China.,Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
| | - Wenbo Tang
- Department of Oncology, School of Medicine, Fudan University, Shanghai, China.,Department of Medical Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Yi Zhun Zhu
- Department of Pharmacology, School of Pharmacy, Macau University of Science and Technology, Macau, China.,Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
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83
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Zhang Y, Tao GJ, Hu L, Qu J, Han Y, Zhang G, Qian Y, Jiang CY, Liu WT. Lidocaine alleviates morphine tolerance via AMPK-SOCS3-dependent neuroinflammation suppression in the spinal cord. J Neuroinflammation 2017; 14:211. [PMID: 29096659 PMCID: PMC5667445 DOI: 10.1186/s12974-017-0983-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 10/18/2017] [Indexed: 12/29/2022] Open
Abstract
Background Morphine tolerance is a clinical challenge, and its pathogenesis is closely related to the neuroinflammation mediated by Toll-like receptor 4 (TLR4). In Chinese pain clinic, lidocaine is combined with morphine to treat chronic pain. We found that lidocaine sufficiently inhibited neuroinflammation induced by morphine and improved analgesic tolerance on the basis of non-affecting pain threshold. Methods CD-1 mice were utilized for tail-flick test to evaluate morphine tolerance. The microglial cell line BV-2 was utilized to investigate the mechanism of lidocaine. Neuroinflammation-related cytokines were measured by western blotting and real-time PCR. The level of suppressor of cytokine signaling 3 (SOCS3) and adenosine 5′-monophosphate (AMP)-activated protein kinase (AMPK)-related signaling pathway was evaluated by western blotting, real-time PCR, enzyme-linked immunosorbent assay (ELISA), and immunofluorescence staining. Results Lidocaine potentiated an anti-nociceptive effect of morphine and attenuated the chronic analgesic tolerance. Lidocaine suppressed morphine-induced activation of microglia and downregulated inflammatory cytokines, interleukin-1β (IL-1β), and tumor necrosis factor-alpha (TNF-α) via upregulating SOCS3 by activating AMPK. Lidocaine enhanced AMPK phosphorylation in a calcium-dependent protein kinase kinase β (CaMKKβ)-dependent manner. Furthermore, lidocaine decreased the phosphorylation of p38 mitogen-activated protein kinase (MAPK) and inhibited the nuclear factor-κB (NF-κB) in accordance with the inhibitory effects to TLR4. Conclusions Lidocaine as a prevalent local anesthetic suppresses morphine tolerance efficiently. AMPK-dependent upregulation of SOCS3 by lidocaine plays a crucial role in the improvement of analgesic tolerance. Electronic supplementary material The online version of this article (10.1186/s12974-017-0983-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yan Zhang
- Neuroprotective Drug Discovery Key Laboratory of Nanjing Medical University, Department of Pharmacology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.,Research Division of Pharmacology, China Pharmaceutical University, Nanjing, Jiangsu, 211100, China
| | - Gao-Jian Tao
- Neuroprotective Drug Discovery Key Laboratory of Nanjing Medical University, Department of Pharmacology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.,Department of Pain, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, Jiangsu, 210008, China
| | - Liang Hu
- Neuroprotective Drug Discovery Key Laboratory of Nanjing Medical University, Department of Pharmacology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Jie Qu
- Neuroprotective Drug Discovery Key Laboratory of Nanjing Medical University, Department of Pharmacology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Yuan Han
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University, Xuzhou, Jiangsu, 221004, China
| | - Guangqin Zhang
- Research Division of Pharmacology, China Pharmaceutical University, Nanjing, Jiangsu, 211100, China
| | - Yanning Qian
- Department of Anesthesiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China
| | - Chun-Yi Jiang
- Neuroprotective Drug Discovery Key Laboratory of Nanjing Medical University, Department of Pharmacology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.
| | - Wen-Tao Liu
- Neuroprotective Drug Discovery Key Laboratory of Nanjing Medical University, Department of Pharmacology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China. .,Department of Pharmacy, Sir Run Run Shaw Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu, 210008, China.
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84
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Zhang M, Wu X, Xu Y, He M, Yang J, Li J, Li Y, Ao G, Cheng J, Jia J. The cystathionine β-synthase/hydrogen sulfide pathway contributes to microglia-mediated neuroinflammation following cerebral ischemia. Brain Behav Immun 2017; 66:332-346. [PMID: 28751019 DOI: 10.1016/j.bbi.2017.07.156] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 07/09/2017] [Accepted: 07/24/2017] [Indexed: 11/16/2022] Open
Abstract
The mechanisms underlying neuroinflammation following cerebral ischemia remain unclear. Hydrogen sulfide (H2S), a newly identified gasotransmitter, has been reported to regulate inflammation. In the current study, we investigated whether the endogenous H2S production pathway contributed to microglia-mediated neuroinflammation following stroke. We used a mouse middle cerebral artery occlusion (MCAO) model and an in vitro cellular model to mimic ischemia-induced microglial neuroinflammation. Expression of the H2S synthase cystathionine β-synthase (CBS) and H2S synthetic activity were rapidly decreased in the ischemic brain tissue following MCAO. Consistently, when cultured microglia were polarized toward a pro-inflammatory phenotype with conditioned medium collected from neurons that had been subjected to oxygen-glucose deprivation (OGD neuron CM), they displayed reduced CBS expression and H2S production. Enhancing H2S bioavailability either by overexpressing CBS or by supplementing with exogenous H2S donors promoted a shift in microglial polarization from ischemia-induced pro-inflammatory phenotypes toward anti-inflammatory phenotypes. Mechanistically, microglia that were exposed to OGD neuron CM displayed reduced activation of AMP-activated protein kinase (AMPK), which was rescued by overexpressing CBS or by supplementing with H2S donors. Moreover, the promoting effects of H2S donors on microglial anti-inflammatory polarization were abolished by an AMPK inhibitor or CaMKKβ inhibitor. Our results suggested that reduced CBS-H2S-AMPK cascade activity contributed to microglia-mediated neuroinflammation following stroke. Targeting the CBS-H2S pathway is a promising therapeutic approach for ischemic stroke.
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Affiliation(s)
- Minjie Zhang
- Department of Neurology and Suzhou Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou, China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Soochow University, Suzhou, China
| | - Xiaowei Wu
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Yingxiu Xu
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Soochow University, Suzhou, China
| | - Meijun He
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Jiaying Yang
- College of Medicine, Soochow University, Suzhou, China
| | - Jie Li
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Soochow University, Suzhou, China
| | - Yuyao Li
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Guizhen Ao
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, China
| | - Jian Cheng
- Department of Neurology and Suzhou Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou, China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Soochow University, Suzhou, China.
| | - Jia Jia
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, China.
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H 2S is a key antisecretory molecule against cholera toxin-induced diarrhoea in mice: Evidence for non-involvement of the AC/cAMP/PKA pathway and AMPK. Nitric Oxide 2017; 76:152-163. [PMID: 28943473 DOI: 10.1016/j.niox.2017.09.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 09/18/2017] [Accepted: 09/20/2017] [Indexed: 01/18/2023]
Abstract
Hydrogen sulphide (H2S) is a gasotransmitter that participates in various physiological and pathophysiological processes within the gastrointestinal tract. We studied the effects and possible mechanism of action of H2S in secretory diarrhoea caused by cholera toxin (CT). The possible mechanisms of action of H2S were investigated using an intestinal fluid secretion model in isolated intestinal loops on anaesthetized mice treated with CT. NaHS and Lawesson's reagent and l-cysteine showed antisecretory activity through reduction of intestinal fluid secretion and loss of Cl- induced by CT. Pretreatment with an inhibitor of cystathionine-γ-lyase (CSE), dl-propargylglycine (PAG), reversed the effect of l-cysteine and caused severe intestinal secretion. Co-treatment with PAG and a submaximal dose of CT increased intestinal fluid secretion, thus supporting the role of H2S in the pathophysiology of cholera. CT increased the expression of CSE and the production of H2S. Pretreatment with PAG did not reverse the effect of SQ 22536 (an AC inhibitor), bupivacaine (inhibitor of cAMP production), KT-5720 (a PKA inhibitor), and AICAR (an AMPK activator). The treatment with Forskolin does not reverse the effects of the H2S donors. Co-treatment with either NaHS or Lawesson's reagent and dorsomorphin (an AMPK inhibitor) did not reverse the effect of the H2S donors. H2S has antisecretory activity and is an essential molecule for protection against the intestinal secretion induced by CT. Thus, H2S donor drugs are promising candidates for cholera therapy. However, more studies are needed to elucidate the possible mechanism of action.
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86
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Wang M, Xin H, Tang W, Li Y, Zhang Z, Fan L, Miao L, Tan B, Wang X, Zhu YZ. AMPK Serves as a Therapeutic Target Against Anemia of Inflammation. Antioxid Redox Signal 2017; 27:251-268. [PMID: 27923278 DOI: 10.1089/ars.2016.6846] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
AIMS Anemia of inflammation (AI), the second prevalent anemia, is associated with worse prognosis and increased mortality in numerous chronic diseases. We recently reported that the gasotransmitter hydrogen sulfide (H2S) suppressed the inflammatory activation of signal transducer and activator of transcription 3 (STAT3) and hepcidin, the critical mediators of AI. Adenosine 5'-monophosphate-activated protein kinase (AMPK) is a novel inflammatory regulator and might be activated by H2S. In this study, we determined whether AMPK played a role in H2S-mediated anti-inflammatory response in AI and evaluated the therapeutic potential of AMPK against AI by pharmacological and clinical approaches. RESULTS We showed that AMPK mediated the inhibition of STAT3, hepcidin, and AI by H2S during inflammation. Moreover, pharmacological and genetic activation of AMPK ameliorated hepcidin production, corrected iron dysregulation, and relieved hypoferremia and anemia in both acute and chronic inflammation models in mice. Mechanistic studies indicated that AMPK suppressed STAT3/hepcidin activation by promoting proteasome-mediated Janus kinase 2 (JAK2) degradation, which was dependent on the intact function of suppressor of cytokine signaling 1 (SOCS1) and increased interactions between SOCS1 and JAK2. Most importantly, the AMPK activator metformin was associated with decreased serum hepcidin content and anemia morbidity in Chinese type 2 diabetes mellitus patients. INNOVATION This is the first study to demonstrate the inhibition of inflammatory hepcidin and AI by AMPK-induced JAK2 degradation. Our work uncovered AMPK as a novel therapeutic target, and metformin as a potential therapy against AI. CONCLUSION The present work demonstrated that AMPK mediated the therapeutic effects of H2S and relieved AI by promoting SOCS1-mediated JAK2 degradation. Antioxid. Redox Signal. 27, 251-268.
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Affiliation(s)
- Minjun Wang
- 1 Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University , Shanghai, China .,2 Department of Pharmacology, School of Pharmacy, Macau University of Science & Technology , Macau, China
| | - Hong Xin
- 1 Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University , Shanghai, China
| | - Wenbo Tang
- 3 Department of Oncology, School of Medicine, Fudan University , Shanghai, China
| | - Yiming Li
- 4 Department of Endocrinology, Huashan Hospital, Fudan University , Shanghai, China
| | - Zhaoyun Zhang
- 4 Department of Endocrinology, Huashan Hospital, Fudan University , Shanghai, China
| | - Linling Fan
- 4 Department of Endocrinology, Huashan Hospital, Fudan University , Shanghai, China
| | - Lei Miao
- 1 Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University , Shanghai, China
| | - Bo Tan
- 5 Department of Clinical Pharmacology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine , Shanghai, China
| | - Xiling Wang
- 1 Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University , Shanghai, China
| | - Yi Zhun Zhu
- 1 Shanghai Key Laboratory of Bioactive Small Molecules, Department of Pharmacology, School of Pharmacy, Fudan University , Shanghai, China .,2 Department of Pharmacology, School of Pharmacy, Macau University of Science & Technology , Macau, China
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87
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Reactive sulfur species inactivate Ca 2+/calmodulin-dependent protein kinase IV via S-polysulfidation of its active-site cysteine residue. Biochem J 2017. [PMID: 28637792 DOI: 10.1042/bcj20170092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Reactive sulfur species (RSS) modulate protein functions via S-polysulfidation of reactive Cys residues. Here, we report that Ca2+/calmodulin (CaM)-dependent protein kinase IV (CaMKIV) was reversibly inactivated by RSS via polysulfidation of the active-site Cys residue. CaMKIV is phosphorylated at Thr196 by its upstream CaMK kinase (CaMKK), resulting in the induction of its full activity. In vitro incubation of CaMKIV with the exogenous RSS donors Na2S n (n = 2-4) resulted in dose-dependent inhibition of the CaMKK-induced phospho-Thr196 and consequent inactivation of the enzyme activity. Conversely, mutated CaMKIV (C198V) was refractory to the Na2S n -induced enzyme inhibition. A biotin-polyethylene glycol-conjugated maleimide capture assay revealed that Cys198 in CaMKIV represents a target for S-polysulfidation. Furthermore, phosho-Thr196 and CaMKIV activity were inhibited by incubation with cysteine hydropersulfide, a newly identified RSS that is generated from cystine by cystathionine-γ-lyase. In transfected cells expressing CaMKIV, ionomycin-induced CaMKIV phosphorylation at Thr196 was decreased upon treatment with either Na2S4 or the endoplasmic reticulum (ER) stress inducer thapsigargin, whereas cells expressing mutant CaMKIV (C198V) were resistant to this treatment. In addition, the ionomycin-induced phospho-Thr196 of endogenous CaMKIV was also inhibited by treatment either with Na2S4 or thapsigargin in Jurkat T lymphocytes. Taken together, these data define a novel signaling function for intracellular RSS in inhibiting CaMKIV activity via S-polysulfidation of its Cys198 during the response to ER stress.
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88
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Liu WC, Wang X, Zhang X, Chen X, Jin X. Melatonin Supplementation, a Strategy to Prevent Neurological Diseases through Maintaining Integrity of Blood Brain Barrier in Old People. Front Aging Neurosci 2017; 9:165. [PMID: 28596733 PMCID: PMC5442221 DOI: 10.3389/fnagi.2017.00165] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 05/10/2017] [Indexed: 12/17/2022] Open
Abstract
Blood brain barrier (BBB) plays a crucial role in maintaining homeostasis of microenvironment that is essential to neural function of the central nervous system (CNS). When facing various extrinsic or intrinsic stimuli, BBB is damaged which is an early event in pathogenesis of a variety of neurological diseases in old patients including acute and chronic cerebral ischemia, Alzheimer’s disease and etc. Treatments that could maintain the integrity of BBB may prevent neurological diseases following various stimuli. Old people often face a common stress of sepsis, during which lipopolysaccharide (LPS) is released into circulation and the integrity of BBB is damaged. Of note, there is a significant decrease of melatonin level in old people and animal. Melatonin has been shown to preserves BBB integrity and permeability via a variety of pathways: inhibition of matrix metalloproteinase-9 (MMP-9), inhibition of NADPH oxidase-2, and impact on silent information regulator 1 (SIRT1) and nucleotide-binding oligomerization domain-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome. More important, a recent study showed that melatonin supplementation alleviates LPS-induced BBB damage in old mice through activating AMP-activated protein kinase (AMPK) and inhibiting gp91phox, suggesting that melatonin supplementation may help prevent neurological diseases through maintaining the integrity of BBB in old people.
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Affiliation(s)
- Wen-Cao Liu
- Department of Emergency, Shanxi Provincial People's HospitalTaiyuan, China
| | - Xiaona Wang
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Department of Neurology, the Second Affiliated Hospital of Soochow UniversitySuzhou, China.,School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai UniversityYantai, China
| | - Xinyu Zhang
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Department of Neurology, the Second Affiliated Hospital of Soochow UniversitySuzhou, China.,School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai UniversityYantai, China
| | - Xi Chen
- Department of Core Facility, the People's Hospital of Baoan ShenzhenShenzhen, China
| | - Xinchun Jin
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Department of Neurology, the Second Affiliated Hospital of Soochow UniversitySuzhou, China.,School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai UniversityYantai, China
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89
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Wang X, Xue GX, Liu WC, Shu H, Wang M, Sun Y, Liu X, Sun YE, Liu CF, Liu J, Liu W, Jin X. Melatonin alleviates lipopolysaccharide-compromised integrity of blood-brain barrier through activating AMP-activated protein kinase in old mice. Aging Cell 2017; 16:414-421. [PMID: 28156052 PMCID: PMC5334533 DOI: 10.1111/acel.12572] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2016] [Indexed: 11/26/2022] Open
Abstract
Blood–brain barrier (BBB) dysfunction is considered to be an early event in the pathogenesis of a variety of neurological diseases in old patients, and this could occur in old people even when facing common stress. However, the mechanism remains to be defined. In this study, we tested the hypothesis that decreased melatonin levels may account for the BBB disruption in old mice challenged with lipopolysaccharide (LPS), which mimicked the common stress of sepsis. Mice (24–28 months of age) received melatonin (10 mg kg−1 day−1, intraperitoneally, i.p.) or saline for one week before exposing to LPS (1 mg kg−1, i.p.). Evan's blue dye (EB) and immunoglobulin G (IgG) leakage were used to assess BBB permeability. Immunostaining and Western blot were used to detect protein expression and distribution. Our results showed that LPS significantly increased BBB permeability in old mice accompanied by the degradation of tight junction proteins occludin and claudin‐5, suppressed AMP‐activated protein kinase (AMPK) activation, and elevated gp91phox protein expression. Interestingly, administration of melatonin for one week significantly decreased LPS‐induced BBB disruption, AMPK suppression, and gp91phox upregualtion. Moreover, activation of AMPK with metformin significantly inhibited LPS‐induced gp91phox upregualtion in endothelial cells. Taken together, our findings demonstrate that melatonin alleviates LPS‐induced BBB disruption through activating AMPK and inhibiting gp91phox upregulation in old mice.
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Affiliation(s)
- Xiaona Wang
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience; The Second Affiliated Hospital of Soochow University; Suzhou 215004 China
| | - Gai-Xiu Xue
- Suzhou Municipal Hospital; Suzhou 215002 China
| | - Wen-Cao Liu
- Department of Emergency; Shanxi Provincial People's Hospital; Taiyuan 030001 China
| | - Hui Shu
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience; The Second Affiliated Hospital of Soochow University; Suzhou 215004 China
| | - Mengwei Wang
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience; The Second Affiliated Hospital of Soochow University; Suzhou 215004 China
| | - Yanyun Sun
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience; The Second Affiliated Hospital of Soochow University; Suzhou 215004 China
| | - Xiaojing Liu
- Translational Center for Stem Cell Research; Tongji Hospital; Stem Cell Research Center; Tongji University School of Medicine; Shanghai 200065 China
| | - Yi Eve Sun
- Translational Center for Stem Cell Research; Tongji Hospital; Stem Cell Research Center; Tongji University School of Medicine; Shanghai 200065 China
- Department of Psychiatry and Biobehavioral Sciences; David Geffen School of Medicine; University of California, Los Angeles; Los Angeles CA 90095 USA
| | - Chun-Feng Liu
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience; The Second Affiliated Hospital of Soochow University; Suzhou 215004 China
- Department of Neurology; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases; The Second Affiliated Hospital of Soochow University; Soochow University; Suzhou 215004 China
| | - Jie Liu
- Translational Center for Stem Cell Research; Tongji Hospital; Stem Cell Research Center; Tongji University School of Medicine; Shanghai 200065 China
| | - Wenlan Liu
- The Central Laboratory; Shenzhen Second People's Hospital; the First Affiliated Hospital of Shenzhen University; Shenzhen 518035 China
| | - Xinchun Jin
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience; The Second Affiliated Hospital of Soochow University; Suzhou 215004 China
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90
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Zhao SC, Ma LS, Chu ZH, Xu H, Wu WQ, Liu F. Regulation of microglial activation in stroke. Acta Pharmacol Sin 2017; 38:445-458. [PMID: 28260801 DOI: 10.1038/aps.2016.162] [Citation(s) in RCA: 253] [Impact Index Per Article: 36.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 11/06/2016] [Indexed: 12/16/2022] Open
Abstract
When ischemic stroke occurs, oxygen and energy depletion triggers a cascade of events, including inflammatory responses, glutamate excitotoxicity, oxidative stress, and apoptosis that result in a profound brain injury. The inflammatory response contributes to secondary neuronal damage, which exerts a substantial impact on both acute ischemic injury and the chronic recovery of the brain function. Microglia are the resident immune cells in the brain that constantly monitor brain microenvironment under normal conditions. Once ischemia occurs, microglia are activated to produce both detrimental and neuroprotective mediators, and the balance of the two counteracting mediators determines the fate of injured neurons. The activation of microglia is defined as either classic (M1) or alternative (M2): M1 microglia secrete pro-inflammatory cytokines (TNFα, IL-23, IL-1β, IL-12, etc) and exacerbate neuronal injury, whereas the M2 phenotype promotes anti-inflammatory responses that are reparative. It has important translational value to regulate M1/M2 microglial activation to minimize the detrimental effects and/or maximize the protective role. Here, we discuss various regulators of microglia/macrophage activation and the interaction between microglia and neurons in the context of ischemic stroke.
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91
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Sun Y, Zhang Y, Li Y, Cheng J, Chen S, Xiao Y, Ao G. Synthesis and biological evaluation of novel hydrogen sulfide releasing nicotinic acid derivatives. Bioorg Med Chem 2016; 24:5368-5373. [PMID: 27618541 DOI: 10.1016/j.bmc.2016.08.060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 08/15/2016] [Accepted: 08/29/2016] [Indexed: 02/07/2023]
Abstract
Twelve novel hybrids of slowly releasing hydrogen sulfide donor ADT-OH combined with nicotinic acid were synthesized. All of their structures had been confirmed by 1H NMR, 13C NMR and MS spectra. The target compounds were evaluated for their neuroprotective effects on hippocampal neuron HT22 cells against glutamate-induced injury at the concentrations of 1-100μM with MTT assay, and their toxicity on HT22 cells untreated by glutamine at the concentration of 100μM. The active compound was further investigated for its effect on ischemic infarct volume by intraperitoneal injection at 3h after ischemia in mice models of permanent middle cerebral artery occlusion (pMCAO). The results showed that all the compounds significantly protected HT22 cells from glutamate-induced damage at most of the experimental concentrations, and had no or little neurotoxicity on normal HT22 cells at the high concentration. More importantly, compound A6 significantly reduced infarct volume in the pMCAO model. These results suggested that compound A6 may be promising for further evaluation for the intervention of cerebral ischemic injury.
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Affiliation(s)
- Yinxing Sun
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Renai Road, Suzhou, Jiangsu Province 215123, China
| | - Yusuo Zhang
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Yuyao Li
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Renai Road, Suzhou, Jiangsu Province 215123, China
| | - Jian Cheng
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Shiyu Chen
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Renai Road, Suzhou, Jiangsu Province 215123, China
| | - Yunqi Xiao
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Guizhen Ao
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Renai Road, Suzhou, Jiangsu Province 215123, China.
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92
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Yang YJ, Zhao Y, Yu B, Xu GG, Wang W, Zhan JQ, Tang ZY, Wang T, Wei B. GluN2B-containing NMDA receptors contribute to the beneficial effects of hydrogen sulfide on cognitive and synaptic plasticity deficits in APP/PS1 transgenic mice. Neuroscience 2016; 335:170-83. [PMID: 27581687 DOI: 10.1016/j.neuroscience.2016.08.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 08/19/2016] [Accepted: 08/19/2016] [Indexed: 12/19/2022]
Abstract
Alzheimer's disease (AD) is the most common type of clinical dementia. Previous studies have demonstrated that hydrogen sulfide (H2S) is implicated with the pathology of AD, and exogenous H2S attenuates spatial memory impairments in AD animal models. However, the molecular mechanism by which H2S improves cognition in AD has not been fully explored. Here, we report that chronic administration of sodium hydrosulfide (NaHS, a H2S donor) elevated hippocampal H2S levels and enhanced hippocampus-dependent contextual fear memory and novel object recognition in amyloid precursor protein (APP)/presenilin-1 (PS1) transgenic mice. In parallel with these behavioral results, treating transgenic mice with NaHS reversed impaired hippocampal long-term potentiation (LTP), which is deemed as the neurobiological basis of learning and memory. At the molecular level, we found that treatment with NaHS did not affect the expression of the GluN1 and GluN2A subunits of NMDA receptor (NMDAR), but did prevent the downregulation of GluN2B subunit and restored its synaptic abundance, response and downstream signaling in the hippocampus in transgenic mice. Moreover, applying Ro 25-6981, a specific GluN2B antagonist, abolished the beneficial effects of NaHS on cognitive performance and hippocampal LTP in transgenic mice. Collectively, our results indicate that H2S can reverse cognitive and synaptic plasticity deficits in AD model mice by restoring surface GluN2B expression and the function of GluN2B-containing NMDARs.
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Affiliation(s)
- Yuan-Jian Yang
- Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang 330029, PR China; Medical Experimental Center, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang 330029, PR China
| | - Ying Zhao
- Department of Pharmacy, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Bin Yu
- Medical Experimental Center, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang 330029, PR China
| | - Guo-Gang Xu
- Nanlou Respiratory Department, Chinese PLA General Hospital, Beijing 100853, PR China
| | - Wei Wang
- Department of Neurology, Second Affiliated Hospital of Nanchang University, Nanchang 330006, PR China
| | - Jin-Qiong Zhan
- Medical Experimental Center, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang 330029, PR China
| | - Zhen-Yu Tang
- Department of Neurology, Second Affiliated Hospital of Nanchang University, Nanchang 330006, PR China
| | - Ting Wang
- Department of Pharmacology, College of Medical Science, Three Gorges University, Yichang 443002, PR China.
| | - Bo Wei
- Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang 330029, PR China.
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93
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Park SY, Jin ML, Ko MJ, Park G, Choi YW. Anti-neuroinflammatory Effect of Emodin in LPS-Stimulated Microglia: Involvement of AMPK/Nrf2 Activation. Neurochem Res 2016; 41:2981-2992. [PMID: 27538959 DOI: 10.1007/s11064-016-2018-6] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 06/16/2016] [Accepted: 07/26/2016] [Indexed: 12/17/2022]
Abstract
AMPK/Nrf2 signaling regulates multiple antioxidative factors and exerts neuroprotective effects. Emodin is one of the main bioactive components extracted from Polygonum multiflorum, a plant possessing important activities for human health and for treating a variety of diseases. This study examined whether emodin can activate AMPK/Nrf2 signaling and induce the expression of genes targeted by this pathway. In addition, the anti-neuroinflammatory properties of emodin in lipopolysaccharide (LPS)-stimulated microglia were examined. In microglia, the emodin treatment increased the levels of LKB1, CaMKII, and AMPK phosphorylation. Emodin increased the translocation and transactivity of Nrf2 and enhanced the levels of HO-1 and NQO1. In addition, the emodin-mediated expression of HO-1 and NQO1 was attenuated completely by an AMPK inhibitor (compound C). Moreover, emodin decreased dramatically the LPS-induced production of NO and PGE2 as well as the protein expression and promoter activity of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2). In addition, emodin effectively inhibited the production of pro-inflammatory cytokines, TNF-α and IL-6, and reduced the level of IκBα phosphorylation, leading to the suppression of the nuclear translocation, phosphorylation, and transactivity of NF-κB. Emodin also suppressed the LPS-stimulated activation of STATs, JNK, and p38 MAPK. The anti-inflammatory effects of emodin were reversed by transfection with Nrf-2 and HO-1 siRNA and by a co-treatment with an AMPK inhibitor. These results suggest that emodin isolated from P. multiflorum can be used as a natural anti-neuroinflammatory agent that exerts its effects by inducing HO-1 and NQO1 via AMPK/Nrf2 signaling in microglia.
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Affiliation(s)
- Sun Young Park
- Bio-IT Fusion Technology Research Institute, Pusan National University, Busan, 609-735, South Korea
| | - Mei Ling Jin
- Bio-IT Fusion Technology Research Institute, Pusan National University, Busan, 609-735, South Korea
| | - Min Jung Ko
- Department of Nanomaterials Engineering, Pusan National University, Busan, 609-735, South Korea
| | - Geuntae Park
- Department of Nanomaterials Engineering, Pusan National University, Busan, 609-735, South Korea.
| | - Young-Whan Choi
- Department of Horticultural Bioscience, Pusan National University, Miryang, 627-706, South Korea.
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Ghrelin-AMPK Signaling Mediates the Neuroprotective Effects of Calorie Restriction in Parkinson's Disease. J Neurosci 2016; 36:3049-63. [PMID: 26961958 DOI: 10.1523/jneurosci.4373-15.2016] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Calorie restriction (CR) is neuroprotective in Parkinson's disease (PD) although the mechanisms are unknown. In this study we hypothesized that elevated ghrelin, a gut hormone with neuroprotective properties, during CR prevents neurodegeneration in an 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) model of PD. CR attenuated the MPTP-induced loss of substantia nigra (SN) dopamine neurons and striatal dopamine turnover in ghrelin WT but not KO mice, demonstrating that ghrelin mediates CR's neuroprotective effect. CR elevated phosphorylated AMPK and ACC levels in the striatum of WT but not KO mice suggesting that AMPK is a target for ghrelin-induced neuroprotection. Indeed, exogenous ghrelin significantly increased pAMPK in the SN. Genetic deletion of AMPKβ1 and 2 subunits only in dopamine neurons prevented ghrelin-induced AMPK phosphorylation and neuroprotection. Hence, ghrelin signaling through AMPK in SN dopamine neurons mediates CR's neuroprotective effects. We consider targeting AMPK in dopamine neurons may recapitulate neuroprotective effects of CR without requiring dietary intervention.
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95
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Inhibition of Extracellular Calcium Influx Results in Enhanced IL-12 Production in LPS-Treated Murine Macrophages by Downregulation of the CaMKKβ-AMPK-SIRT1 Signaling Pathway. Mediators Inflamm 2016; 2016:6152713. [PMID: 27313401 PMCID: PMC4904125 DOI: 10.1155/2016/6152713] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 04/19/2016] [Accepted: 04/27/2016] [Indexed: 12/18/2022] Open
Abstract
Activated macrophages are the primary sources of IL-12, a key cytokine bridging innate and adaptive immunity. However, macrophages produce low amounts of IL-12 upon stimulation and the underlying regulatory mechanism remains unclear. In this study, we found a new calcium-dependent mechanism that controlled IL-12 production in LPS-treated murine macrophages. First, LPS was demonstrated to induce extracellular calcium entry in murine peritoneal macrophages and inhibition of calcium influx resulted in marked enhancement in IL-12 production. Then, withdrawal of extracellular calcium was found to suppress CaMKKβ and AMPK activation triggered by LPS while chemical inhibition or genetic knockdown of these two kinases augmented LPS induced IL-12 production. AMPK activation increased the NAD+/NADH ratio and activated Sirtuin 1 (SIRT1), a NAD+-dependent deacetylating enzyme and negative regulator of inflammation. Chemical inhibitor or siRNA of SIRT1 enhanced IL-12 release while its agonist suppressed IL-12 production. Finally, it was found that SIRT1 selectively affected the transcriptional activity of NF-κB which thereby inhibited IL-12 production. Overall, our study demonstrates a new role of transmembrane calcium mobilization in immunity modulation such that inhibition of calcium influx leads to impaired activation of CaMKKβ-AMPK-SIRT1 signaling pathway which lifts restriction on NF-κB activation and results in enhanced IL-12 production.
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96
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Watanabe Y. [Regulation of calcium signals via redox modification]. Nihon Yakurigaku Zasshi 2016; 147:285-289. [PMID: 27181723 DOI: 10.1254/fpj.147.285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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97
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Song H, Sun Y, Xu G, Hou B, Ao G. Synthesis and biological evaluation of novel hydrogen sulfide releasing glycyrrhetic acid derivatives. J Enzyme Inhib Med Chem 2016; 31:1457-63. [DOI: 10.3109/14756366.2016.1144596] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Heng Song
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, Suzhou, China and
| | - Yinxing Sun
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, Suzhou, China and
| | - Guanglin Xu
- College of Life Science, Nanjing Normal University, Nanjing, China
| | - Bingbo Hou
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, Suzhou, China and
| | - Guizhen Ao
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, Suzhou, China and
- College of Life Science, Nanjing Normal University, Nanjing, China
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98
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Yang S, Deng D, Luo Y, Wu Y, Zhu R, Xue K, Zhou Y. NaHS inhibits NF-κB signal against inflammation and oxidative stress in post-infectious irritable bowel syndrome. RSC Adv 2016. [DOI: 10.1039/c6ra13849g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study, the alleviating role of hydrogen sulfide (H2S) was investigated in a Post-Infectious Irritable Bowel Syndrome (PI-IBS) murine model and Caco-2 cells.
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Affiliation(s)
- Shenglan Yang
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
| | - Danfang Deng
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
| | - Yingying Luo
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
| | - Yanran Wu
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
| | - Rui Zhu
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
| | - Kaming Xue
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
| | - Yanping Zhou
- Department of Integrated Traditional Chinese and Western Medicine
- Union Hospital
- Tongji Medical College
- Huazhong University of Science and Technology
- Wuhan 430022
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99
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Telmisartan prevention of LPS-induced microglia activation involves M2 microglia polarization via CaMKKβ-dependent AMPK activation. Brain Behav Immun 2015; 50:298-313. [PMID: 26188187 DOI: 10.1016/j.bbi.2015.07.015] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 07/02/2015] [Accepted: 07/14/2015] [Indexed: 12/31/2022] Open
Abstract
Brain inflammation plays an important role in the pathophysiology of many psychiatric and neurological diseases. During brain inflammation, microglia cells are activated, producing neurotoxic molecules and neurotrophic factors depending on their pro-inflammatory M1 and anti-inflammatory M2 phenotypes. It has been demonstrated that Angiotensin II type 1 receptor blockers (ARBs) ameliorate brain inflammation and reduce M1 microglia activation. The ARB telmisartan suppresses glutamate-induced upregulation of inflammatory genes in cultured primary neurons. We wished to clarify whether telmisartan, in addition, prevents microglia activation through polarization to an anti-inflammatory M2 phenotype. We found that telmisartan promoted M2 polarization and reduced M1 polarization in LPS-stimulated BV2 and primary microglia cells, effects partially dependent on PPARγ activation. The promoting effects of telmisartan on M2 polarization, were attenuated by an AMP-activated protein kinase (AMPK) inhibitor or AMPK knockdown, indicating that AMPK activation participates on telmisartan effects. Moreover, in LPS-stimulated BV2 cells, telmisartan enhancement of M2 gene expression was prevented by the inhibitor STO-609 and siRNA of calmodulin-dependent protein kinase kinase β (CaMKKβ), an upstream kinase of AMPK. Furthermore, telmisartan enhanced brain AMPK activation and M2 gene expression in a mouse model of LPS-induced neuroinflammation. In addition, telmisartan reduced the LPS-induced sickness behavior in this in vivo model, and this effect was prevented by prior administration of an AMPK inhibitor. Our results indicate that telmisartan can be considered as a novel AMPK activator, suppressing microglia activation by promoting M2 polarization. Telmisartan may provide a novel, safe therapeutic approach to treat brain disorders associated with enhanced inflammation.
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100
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Lin CL, Huang WN, Li HH, Huang CN, Hsieh S, Lai C, Lu FJ. Hydrogen-rich water attenuates amyloid β-induced cytotoxicity through upregulation of Sirt1-FoxO3a by stimulation of AMP-activated protein kinase in SK-N-MC cells. Chem Biol Interact 2015; 240:12-21. [PMID: 26271894 DOI: 10.1016/j.cbi.2015.07.013] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 06/30/2015] [Accepted: 07/24/2015] [Indexed: 12/16/2022]
Abstract
Amyloid β (Aβ) peptides are identified in cause of neurodegenerative diseases such as Alzheimer's disease (AD). Previous evidence suggests Aβ-induced neurotoxicity is linked to the stimulation of reactive oxygen species (ROS) production. The accumulation of Aβ-induced ROS leads to increased mitochondrial dysfunction and triggers apoptotic cell death. This suggests antioxidant therapies may be beneficial for preventing ROS-related diseases such as AD. Recently, hydrogen-rich water (HRW) has been proven effective in treating oxidative stress-induced disorders because of its ROS-scavenging abilities. However, the precise molecular mechanisms whereby HRW prevents neuronal death are still unclear. In the present study, we evaluated the putative pathways by which HRW protects against Aβ-induced cytotoxicity. Our results indicated that HRW directly counteracts oxidative damage by neutralizing excessive ROS, leading to the alleviation of Aβ-induced cell death. In addition, HRW also stimulated AMP-activated protein kinase (AMPK) in a sirtuin 1 (Sirt1)-dependent pathway, which upregulates forkhead box protein O3a (FoxO3a) downstream antioxidant response and diminishes Aβ-induced mitochondrial potential loss and oxidative stress. Taken together, our findings suggest that HRW may have potential therapeutic value to inhibit Aβ-induced neurotoxicity.
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Affiliation(s)
- Chih-Li Lin
- Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan; Department of Medical Research, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Wen-Nung Huang
- Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Hsin-Hua Li
- Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Chien-Ning Huang
- Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Sam Hsieh
- Unitira Applied Materials Corp., Taipei, Taiwan
| | - Copper Lai
- Fluxtek International Corp., Pingtung, Taiwan
| | - Fung-Jou Lu
- Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan; School of Medical Applied Chemistry, Chung Shan Medical University, Taichung, Taiwan.
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