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Rao J, Li H, Zhang H, Xiang X, Ding X, Li L, Geng F, Qi H. Periplaneta Americana (L.) extract activates the ERK/CREB/BDNF pathway to promote post-stroke neuroregeneration and recovery of neurological functions in rats. JOURNAL OF ETHNOPHARMACOLOGY 2024; 321:117400. [PMID: 37952730 DOI: 10.1016/j.jep.2023.117400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/26/2023] [Accepted: 11/06/2023] [Indexed: 11/14/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Periplaneta americana (L.) (PA) has been used in traditional Chinese medicine for thousands of years for the effect of invigorating blood circulation and removing blood stasis. Modern pharmacological research shown that PA extract exhibits promising effects in promoting wound healing and regeneration, as well as in brain diseases such as Parkinson's disease (PD). However, whether it is effective for neuroregeneration and neurological function recovery after stroke still unknown. AIM OF THE STUDY This study aims to investigate the potential effect of PA extract to promote brain remodeling through the activation of endogenous neurogenesis and angiogenesis, in addition, preliminary exploration of its regulatory mechanism. METHODS Firstly, BrdU proliferation assay and immunofluorescence (IF) staining were used to evaluate the effect of PA extract on the neurogenesis and angiogenesis in vitro and in vivo. Subsequently, the effects of PA extract on brain injury in stroke rats were assessed by TTC and HE. While mNSS score, adhesive removal test, rota-rod test, and morris water maze test were used to assess the impact of PA extract on neurological function in post-stroke rats. Finally, the molecular mechanisms of PA extract regulation were explored by RNA-Seq and western blotting. RESULTS The number of BrdU+ cells in C17.2 cells, NSCs and BMECs dramatically increased, as well as the expression of astrocyte marker protein GFAP and neuronal marker protein Tuj-1 in C17.2 and NSCs. Moreover, PA extract also increased the number of BrdU+DCX+, BrdU+GFAP+, BrdU+CD31+ cells in the SGZ area of transient middle cerebral artery occlusion model (tMCAO) rats. TTC and HE staining revealed that PA extract significantly reduced the infarction volume and ameliorated the pathological damage. Behavioral tests demonstrated that treatment with PA extract reduced the mNSS score and the time required to remove adhesive tape, while increasing the time spent on the rotarod. Additionally, in the morris water maze test, the frequency of crossing platform and the time spent in the platform quadrant increased. Finally, RNA-Seq and Western blot revealed that PA extract increased the expression of p-ERK, p-CREB and BDNF. Importantly, PA extract mediated proliferation and differentiation of C17.2 and NSCs reversed by the ERK inhibitor SCH772984 and the BDNF inhibitor ANA-12, respectively. CONCLUSION Our study demonstrated that PA extract promoted neurogenesis and angiogenesis by activating the CREB/ERK signaling pathway and upregulating BDNF expression, thereby recovering neurological dysfunction in post-stroke.
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Affiliation(s)
- Jiangyan Rao
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China
| | - Hongpu Li
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China
| | - Haonan Zhang
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China
| | - Xiaoxia Xiang
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China
| | - Xinyu Ding
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China
| | - Li Li
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China
| | - Funeng Geng
- Sichuan Key Laboratory of Medical American Cockroach, Chengdu, Sichuan, 610000, China.
| | - Hongyi Qi
- College of Pharmaceutical Sciences & College of Chinese Medicine, Southwest University, Chongqing, 400715, China.
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2
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Imbaby S, Elkholy SE, Faisal S, Abdelmaogood AKK, Mehana AE, Mansour BSA, Abd El-Moneam SM, Elaidy SM. The GSTP1/MAPKs/BIM/SMAC modulatory actions of nitazoxanide: Bioinformatics and experimental evidence in subcutaneous solid Ehrlich carcinoma-inoculated mice. Life Sci 2023; 319:121496. [PMID: 36822315 DOI: 10.1016/j.lfs.2023.121496] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 02/05/2023] [Accepted: 02/08/2023] [Indexed: 02/25/2023]
Abstract
AIMS Ehrlich ascites carcinoma and its subcutaneous inoculated solid tumour form (SEC) are reliable models for chemotherapeutic molecular targets exploration. Novel chemotherapeutic approaches are identified as molecular targets for intrinsic apoptosis, like the modulation of the second mitochondria-derived activator of caspases (SMAC). SMAC is a physiological substrate of mitogen-activated protein kinases (MAPKs). Glutathione-S-transferase P1 (GSTP1) and its close association with MAPKs play an important role in malignant cell proliferation, metastasis, and resistance to chemotherapeutics. Nitazoxanide (NTZ) is an emerging cancer therapy and its targeted GSTP1 evidence remains a knowledge need. MAIN METHODS In the present mice-established SEC, the chemotherapeutic roles of oral NTZ (200 mg/kg/day) and 5-fluorouracil (5-FU; 20 mg/kg/day, intraperitoneally) regimens were evaluated by measuring changes in tumour mass, the tumour MAPKs, cytochrome c, Bcl-2 interacting mediator of cell death (BIM), and SMAC signalling pathway in addition to its molecular downstream; caspases 3 and 9. KEY FINDINGS Computational analysis for these target protein interactions showed direct-ordered interactions. After individual therapy with NTZ and 5-FU regimens, the histological architecture of the extracted tumour discs revealed decreases in viable tumour regions with significant necrosis surrounds. These findings were consistent with gross tumour sizes. Each separate regimen lowered the remarkable GSTP1 and elevated the low MAPKs expressions, cytochrome c, BIM, SMAC, and caspases 3, and 9 in EST tissues. SIGNIFICANCE The chemotherapeutic activity of NTZ in SEC was proven. Additionally, NTZ possesses a SMAC modulatory activity that, following thorough research, should be taken into consideration as a chemotherapeutic approach in solid tumours.
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Affiliation(s)
- Samar Imbaby
- Department of Clinical Pharmacology, Faculty of Medicine, Suez Canal University, 41522 Ismailia, Egypt.
| | - Shereen E Elkholy
- Department of Clinical Pharmacology, Faculty of Medicine, Port Said University, Port Said, Egypt
| | - Salwa Faisal
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Suez Canal University, 41522 Ismailia, Egypt
| | - Asmaa K K Abdelmaogood
- Department of Clinical and Chemical Pathology, Faculty of Medicine, Suez Canal University, 41522 Ismailia, Egypt
| | - Amir E Mehana
- Department of Zoology, Faculty of Science, Suez Canal University, 41522 Ismailia, Egypt
| | - Basma S A Mansour
- Department of Human Anatomy and Embryology, Faculty of Medicine, Suez Canal University, 41522 Ismailia, Egypt
| | - Samar M Abd El-Moneam
- Department of Human Anatomy and Embryology, Faculty of Medicine, Suez Canal University, 41522 Ismailia, Egypt
| | - Samah M Elaidy
- Department of Clinical Pharmacology, Faculty of Medicine, Suez Canal University, 41522 Ismailia, Egypt.
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3
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Fang Y, Wang J, Zhao M, Zheng Q, Ren C, Wang Y, Zhang J. Progress and Challenges in Targeted Protein Degradation for Neurodegenerative Disease Therapy. J Med Chem 2022; 65:11454-11477. [PMID: 36006861 DOI: 10.1021/acs.jmedchem.2c00844] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Neurodegenerative diseases (NDs) are currently incurable diseases that cause progressive degeneration of nerve cells. Many of the disease-causing proteins of NDs are "undruggable" for traditional small-molecule inhibitors (SMIs). None of the compounds that attenuated the amyloid-β (Aβ) accumulation process have entered clinical practice, and many phase III clinical trials of SMIs for Alzheimer's disease (AD) have failed. In recent years, emerging targeted protein degradation (TPD) technologies such as proteolysis-targeting chimeras (PROTACs), lysosome-targeting chimaeras (LYTACs), and autophagy-targeting chimeras (AUTACs) with TPD-assistive technologies such as click-formed proteolysis-targeting chimeras (CLIPTACs) and deubiquitinase-targeting chimera (DUBTAC) have developed rapidly. In vitro and in vivo experiments have also confirmed that TPD technology can target the degradation of ND pathogenic proteins, bringing hope for the treatment of NDs. Herein, we review the latest TPD technologies, introduce their targets and technical characteristics, and discuss the emerging TPD technologies with potential in ND research, with the hope of providing a new perspective for the development of TPD technology in the NDs field.
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Affiliation(s)
- Yingxu Fang
- Joint Research Institution of Altitude Health, Department of Respiratory and Critical Care Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China
| | - Jiaxing Wang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, Tennessee 38163, United States
| | - Min Zhao
- Joint Research Institution of Altitude Health, Department of Respiratory and Critical Care Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Tianfu Jincheng Laboratory, Chengdu 610041, Sichuan, China
| | - Qinwen Zheng
- Joint Research Institution of Altitude Health, Department of Respiratory and Critical Care Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China
| | - Changyu Ren
- Department of Pharmacy, Chengdu Fifth People's Hospital, Chengdu 611130, Sichuan, China
| | - Yuxi Wang
- Joint Research Institution of Altitude Health, Department of Respiratory and Critical Care Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Tianfu Jincheng Laboratory, Chengdu 610041, Sichuan, China
| | - Jifa Zhang
- Joint Research Institution of Altitude Health, Department of Respiratory and Critical Care Medicine, State Key Laboratory of Biotherapy and Cancer Center, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China.,Tianfu Jincheng Laboratory, Chengdu 610041, Sichuan, China
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4
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Rai SN, Tiwari N, Singh P, Mishra D, Singh AK, Hooshmandi E, Vamanu E, Singh MP. Therapeutic Potential of Vital Transcription Factors in Alzheimer's and Parkinson's Disease With Particular Emphasis on Transcription Factor EB Mediated Autophagy. Front Neurosci 2022; 15:777347. [PMID: 34970114 PMCID: PMC8712758 DOI: 10.3389/fnins.2021.777347] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 11/22/2021] [Indexed: 12/12/2022] Open
Abstract
Autophagy is an important cellular self-digestion and recycling pathway that helps in maintaining cellular homeostasis. Dysregulation at various steps of the autophagic and endolysosomal pathway has been reported in several neurodegenerative disorders such as Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington disease (HD) and is cited as a critically important feature for central nervous system (CNS) proteostasis. Recently, another molecular target, namely transcription factor EB (TFEB) has been explored globally to treat neurodegenerative disorders. This TFEB, is a key regulator of autophagy and lysosomal biogenesis pathway. Multiple research studies suggested therapeutic potential by targeting TFEB to treat human diseases involving autophagy-lysosomal dysfunction, especially neurodegenerative disorders. A common observation involving all neurodegenerative disorders is their poor efficacy in clearing and recycle toxic aggregated proteins and damaged cellular organelles due to impairment in the autophagy pathway. This dysfunction in autophagy characterized by the accumulation of toxic protein aggregates leads to a progressive loss in structural integrity/functionality of neurons and may even result in neuronal death. In recent years TFEB, a key regulator of autophagy and lysosomal biogenesis, has received considerable attention. It has emerged as a potential therapeutic target in numerous neurodegenerative disorders like AD and PD. In various neurobiology studies involving animal models, TFEB has been found to ameliorate neurotoxicity and rescue neurodegeneration. Since TFEB is a master transcriptional regulator of autophagy and lysosomal biogenesis pathway and plays a crucial role in defining autophagy activation. Studies have been done to understand the mechanisms for TFEB dysfunction, which may yield insights into how TFEB might be targeted and used for the therapeutic strategy to develop a treatment process with extensive application to neurodegenerative disorders. In this review, we explore the role of different transcription factor-based targeted therapy by some natural compounds for AD and PD with special emphasis on TFEB.
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Affiliation(s)
| | - Neeraj Tiwari
- Faculty of Biosciences, Institute of Biosciences and Technology, Shri Ramswaroop Memorial University, Barabanki, India
| | - Payal Singh
- Department of Zoology, Mahila Mahavidyalaya, Banaras Hindu University, Varanasi, India
| | - Divya Mishra
- Centre of Bioinformatics, University of Allahabad, Prayagraj, India
| | - Anurag Kumar Singh
- Centre of Experimental Medicine and Surgery, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - Etrat Hooshmandi
- Clinical Neurology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Emanuel Vamanu
- Faculty of Biotechnology, University of Agronomic Science and Veterinary Medicine, Bucharest, Romania
| | - Mohan P Singh
- Centre of Biotechnology, University of Allahabad, Prayagraj, India
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5
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Parodi-Rullán RM, Javadov S, Fossati S. Dissecting the Crosstalk between Endothelial Mitochondrial Damage, Vascular Inflammation, and Neurodegeneration in Cerebral Amyloid Angiopathy and Alzheimer's Disease. Cells 2021; 10:cells10112903. [PMID: 34831125 PMCID: PMC8616424 DOI: 10.3390/cells10112903] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/22/2021] [Accepted: 10/24/2021] [Indexed: 12/25/2022] Open
Abstract
Alzheimer’s disease (AD) is the most prevalent cause of dementia and is pathologically characterized by the presence of parenchymal senile plaques composed of amyloid β (Aβ) and intraneuronal neurofibrillary tangles of hyperphosphorylated tau protein. The accumulation of Aβ also occurs within the cerebral vasculature in over 80% of AD patients and in non-demented individuals, a condition called cerebral amyloid angiopathy (CAA). The development of CAA is associated with neurovascular dysfunction, blood–brain barrier (BBB) leakage, and persistent vascular- and neuro-inflammation, eventually leading to neurodegeneration. Although pathologically AD and CAA are well characterized diseases, the chronology of molecular changes that lead to their development is still unclear. Substantial evidence demonstrates defects in mitochondrial function in various cells of the neurovascular unit as well as in the brain parenchyma during the early stages of AD and CAA. Dysfunctional mitochondria release danger-associated molecular patterns (DAMPs) that activate a wide range of inflammatory pathways. In this review, we gather evidence to postulate a crucial role of the mitochondria, specifically of cerebral endothelial cells, as sensors and initiators of Aβ-induced vascular inflammation. The activated vasculature recruits circulating immune cells into the brain parenchyma, leading to the development of neuroinflammation and neurodegeneration in AD and CAA.
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Affiliation(s)
- Rebecca M. Parodi-Rullán
- Alzheimer’s Center at Temple, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA;
| | - Sabzali Javadov
- Department of Physiology, University of Puerto Rico School of Medicine, San Juan, PR 00921, USA;
| | - Silvia Fossati
- Alzheimer’s Center at Temple, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA;
- Correspondence: ; Tel.: +1-215-707-6046
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6
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Seo J, Koçak DD, Bartelt LC, Williams CA, Barrera A, Gersbach CA, Reddy TE. AP-1 subunits converge promiscuously at enhancers to potentiate transcription. Genome Res 2021; 31:538-550. [PMID: 33674350 PMCID: PMC8015846 DOI: 10.1101/gr.267898.120] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 02/17/2021] [Indexed: 12/12/2022]
Abstract
The AP-1 transcription factor (TF) dimer contributes to many biological processes and environmental responses. AP-1 can be composed of many interchangeable subunits. Unambiguously determining the binding locations of these subunits in the human genome is challenging because of variable antibody specificity and affinity. Here, we definitively establish the genome-wide binding patterns of five AP-1 subunits by using CRISPR to introduce a common antibody tag on each subunit. We find limited evidence for strong dimerization preferences between subunits at steady state and find that, under a stimulus, dimerization patterns reflect changes in the transcriptome. Further, our analysis suggests that canonical AP-1 motifs indiscriminately recruit all AP-1 subunits to genomic sites, which we term AP-1 hotspots. We find that AP-1 hotspots are predictive of cell type–specific gene expression and of genomic responses to glucocorticoid signaling (more so than super-enhancers) and are significantly enriched in disease-associated genetic variants. Together, these results support a model where promiscuous binding of many AP-1 subunits to the same genomic location play a key role in regulating cell type–specific gene expression and environmental responses.
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Affiliation(s)
- Jungkyun Seo
- Department of Biostatistics and Bioinformatics, Division of Integrative Genomics, Duke University Medical Center, Durham, North Carolina 27708, USA.,Computational Biology and Bioinformatics Graduate Program, Duke University, Durham, North Carolina 27708, USA.,Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,Center for Advanced Genomic Technologies, Duke University, Durham, North Carolina 27708, USA
| | - D Dewran Koçak
- Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,Center for Advanced Genomic Technologies, Duke University, Durham, North Carolina 27708, USA.,Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, USA
| | - Luke C Bartelt
- Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,University Program in Genetics and Genomics, Duke University, Durham, North Carolina 27708, USA
| | - Courtney A Williams
- Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,Center for Advanced Genomic Technologies, Duke University, Durham, North Carolina 27708, USA
| | - Alejandro Barrera
- Department of Biostatistics and Bioinformatics, Division of Integrative Genomics, Duke University Medical Center, Durham, North Carolina 27708, USA.,Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,Center for Advanced Genomic Technologies, Duke University, Durham, North Carolina 27708, USA
| | - Charles A Gersbach
- Computational Biology and Bioinformatics Graduate Program, Duke University, Durham, North Carolina 27708, USA.,Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,Center for Advanced Genomic Technologies, Duke University, Durham, North Carolina 27708, USA.,Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, USA.,University Program in Genetics and Genomics, Duke University, Durham, North Carolina 27708, USA.,Department of Surgery, Duke University Medical Center, Durham, North Carolina 27708, USA
| | - Timothy E Reddy
- Department of Biostatistics and Bioinformatics, Division of Integrative Genomics, Duke University Medical Center, Durham, North Carolina 27708, USA.,Computational Biology and Bioinformatics Graduate Program, Duke University, Durham, North Carolina 27708, USA.,Center for Genomic and Computational Biology, Duke University, Durham, North Carolina 27708, USA.,Center for Advanced Genomic Technologies, Duke University, Durham, North Carolina 27708, USA.,Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, USA.,University Program in Genetics and Genomics, Duke University, Durham, North Carolina 27708, USA.,Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina 27708, USA
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7
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Malishev R, Ben-Zichri S, Oren O, Shauloff N, Peretz T, Taube R, Papo N, Jelinek R. The pro-apoptotic domain of BIM protein forms toxic amyloid fibrils. Cell Mol Life Sci 2021; 78:2145-2155. [PMID: 32844279 PMCID: PMC11072030 DOI: 10.1007/s00018-020-03623-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 06/26/2020] [Accepted: 08/14/2020] [Indexed: 12/12/2022]
Abstract
BIM is a key apoptotic protein, participating in diverse cellular processes. Interestingly, recent studies have hypothesized that BIM is associated with the extensive neuronal cell death encountered in protein misfolding diseases, such as Alzheimer's disease. Here, we report that the core pro-apoptotic domain of BIM, the BIM-BH3 motif, forms ubiquitous amyloid fibrils. The BIM-BH3 fibrils exhibit cytotoxicity, disrupt mitochondrial functions, and modulate the structures and dynamics of mitochondrial membrane mimics. Interestingly, a slightly longer peptide in which BIM-BH3 was flanked by four additional residues, widely employed as a model of the pro-apoptotic core domain of BIM, did not form fibrils, nor exhibited cell disruptive properties. The experimental data suggest a new mechanistic role for the BIM-BH3 domain, and demonstrate, for the first time, that an apoptotic peptide forms toxic amyloid fibrils.
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Affiliation(s)
- Ravit Malishev
- Department of Chemistry and Ilse, Katz Institute for Nanotechnology, Ben Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Shani Ben-Zichri
- Department of Chemistry and Ilse, Katz Institute for Nanotechnology, Ben Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Ofek Oren
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Nitzan Shauloff
- Department of Chemistry and Ilse, Katz Institute for Nanotechnology, Ben Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Tal Peretz
- Department of Life Sciences, Ben-Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Ran Taube
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Niv Papo
- Avram and Stella Goldstein-Goren Department of Biotechnology Engineering and the National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, 84105, Beer Sheva, Israel
| | - Raz Jelinek
- Department of Chemistry and Ilse, Katz Institute for Nanotechnology, Ben Gurion University of the Negev, 84105, Beer Sheva, Israel.
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8
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From Brain to Heart: Possible Role of Amyloid-β in Ischemic Heart Disease and Ischemia-Reperfusion Injury. Int J Mol Sci 2020; 21:ijms21249655. [PMID: 33348925 PMCID: PMC7766370 DOI: 10.3390/ijms21249655] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/13/2020] [Accepted: 12/14/2020] [Indexed: 02/06/2023] Open
Abstract
Ischemic heart disease (IHD) is among the leading causes of death in developed countries. Its pathological origin is traced back to coronary atherosclerosis, a lipid-driven immuno-inflammatory disease of the arteries that leads to multifocal plaque development. The primary clinical manifestation of IHD is acute myocardial infarction (AMI),) whose prognosis is ameliorated with optimal timing of revascularization. Paradoxically, myocardium re-perfusion can be detrimental because of ischemia-reperfusion injury (IRI), an oxidative-driven process that damages other organs. Amyloid-β (Aβ) plays a physiological role in the central nervous system (CNS). Alterations in its synthesis, concentration and clearance have been connected to several pathologies, such as Alzheimer's disease (AD) and cerebral amyloid angiopathy (CAA). Aβ has been suggested to play a role in the pathogenesis of IHD and cerebral IRI. The purpose of this review is to summarize what is known about the pathological role of Aβ in the CNS; starting from this evidence, we will illustrate the role played by Aβ in the development of coronary atherosclerosis and its possible implications in the pathophysiology of IHD and myocardial IRI. Better elucidation of Aβ's contribution to the molecular pathways underlying IHD and IRI could be of great help in developing new therapeutic strategies.
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9
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Parodi-Rullán R, Sone JY, Fossati S. Endothelial Mitochondrial Dysfunction in Cerebral Amyloid Angiopathy and Alzheimer's Disease. J Alzheimers Dis 2020; 72:1019-1039. [PMID: 31306129 DOI: 10.3233/jad-190357] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease (AD) is the most prevalent form of dementia. Cerebrovascular dysfunction is one of the earliest events in the pathogenesis of AD, as well as in vascular and mixed dementias. Cerebral amyloid angiopathy (CAA), the deposition of amyloid around cerebral vessels, is observed in up to 90% of AD patients and in approximately 50% of elderly individuals over 80 years of age. CAA is a strong contributor to vascular dysfunction in AD. CAA-laden brain vessels are characterized by dysfunctional hemodynamics and leaky blood-brain barrier (BBB), contributing to clearance failure and further accumulation of amyloid-β (Aβ) in the cerebrovasculature and brain parenchyma. Mitochondrial dysfunction is increasingly recognized as an important early initiator of the pathogenesis of AD and CAA. The objective of this review is to discuss the effects of Aβ on cerebral microvascular cell function, focusing on its impact on endothelial mitochondria. After introducing CAA and its etiology and genetic risk factors, we describe the pathological relationship between cerebrovascular amyloidosis and brain microvascular endothelial cell dysfunction, critically analyzing its roles in disease progression, hypoperfusion, and BBB integrity. Then, we focus on discussing the effect of Aβ challenge on endothelial mitochondrial dysfunction pathways, and their contribution to the progression of neurovascular dysfunction in AD and dementia. Finally, we report potential pharmacological and non-pharmacological mitochondria-targeted therapeutic strategies which may help prevent or delay cerebrovascular failure.
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Affiliation(s)
- Rebecca Parodi-Rullán
- Alzheimer's Center at Temple, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
| | - Je Yeong Sone
- Department of Psychiatry, Center for Brain Health, NYU School of Medicine, New York, NY, USA
| | - Silvia Fossati
- Alzheimer's Center at Temple, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA
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10
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JNK1 and ERK1/2 modulate lymphocyte homeostasis via BIM and DRP1 upon AICD induction. Cell Death Differ 2020; 27:2749-2767. [PMID: 32346136 PMCID: PMC7492225 DOI: 10.1038/s41418-020-0540-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 03/31/2020] [Accepted: 04/02/2020] [Indexed: 01/27/2023] Open
Abstract
The Activation-Induced Cell Death (AICD) is a stimulation-dependent form of apoptosis used by the organism to shutdown T-cell response once the source of inflammation has been eliminated, while allowing the generation of immune memory. AICD is thought to progress through the activation of the extrinsic Fas/FasL pathway of cell death, leading to cytochrome-C release through caspase-8 and Bid activation. We recently described that, early upon AICD induction, mitochondria undergo structural alterations, which are required to promote cytochrome-C release and execute cell death. Here, we found that such alterations do not depend on the Fas/FasL pathway, which is instead only lately activated to amplify the cell death cascade. Instead, such alterations are primarily dependent on the MAPK proteins JNK1 and ERK1/2, which, in turn, regulate the activity of the pro-fission protein Drp1 and the pro-apoptotic factor Bim. The latter regulates cristae disassembly and cooperate with Drp1 to mediate the Mitochondrial Outer Membrane Permeabilization (MOMP), leading to cytochrome-C release. Interestingly, we found that Bim is also downregulated in T-cell Acute Lymphoblastic Leukemia (T-ALL) cells, this alteration favouring their escape from AICD-mediated control.
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11
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Malishev R, Nandi S, Śmiłowicz D, Bakavayev S, Engel S, Bujanover N, Gazit R, Metzler-Nolte N, Jelinek R. Interactions between BIM Protein and Beta-Amyloid May Reveal a Crucial Missing Link between Alzheimer's Disease and Neuronal Cell Death. ACS Chem Neurosci 2019; 10:3555-3564. [PMID: 31141342 DOI: 10.1021/acschemneuro.9b00177] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Extensive neuronal cell death is among the pathological hallmarks of Alzheimer's disease. While neuron death is coincident with formation of plaques comprising the beta-amyloid (Aβ) peptide, a direct causative link between Aβ (or other Alzheimer's-associated proteins) and cell toxicity is yet to be found. Here we show that BIM-BH3, the primary proapoptotic domain of BIM, a key protein in varied apoptotic cascades of which elevated levels have been found in brain cells of patients afflicted with Alzheimer's disease, interacts with the 42-residue amyloid isoform Aβ42. Remarkably, BIM-BH3 modulated the structure, fibrillation pathway, aggregate morphology, and membrane interactions of Aβ42. In particular, BIM-BH3 inhibited Aβ42 fibril-formation, while it simultaneously enhanced protofibril assembly. Furthermore, we discovered that BIM-BH3/Aβ42 interactions induced cell death in a human neuroblastoma cell model. Overall, our data provide a crucial mechanistic link accounting for neuronal cell death in Alzheimer's disease patients and the participation of both BIM and Aβ42 in the neurotoxicity process.
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Affiliation(s)
- Ravit Malishev
- Department of Chemistry and Ilse Katz Institute for Nanotechnology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Sukhendu Nandi
- Inorganic Chemistry I – Bioinorganic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Dariusz Śmiłowicz
- Inorganic Chemistry I – Bioinorganic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Shamchal Bakavayev
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Stanislav Engel
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Nir Bujanover
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Roi Gazit
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Nils Metzler-Nolte
- Inorganic Chemistry I – Bioinorganic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Raz Jelinek
- Department of Chemistry and Ilse Katz Institute for Nanotechnology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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12
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Tsoy A, Saliev T, Abzhanova E, Turgambayeva A, Kaiyrlykyzy A, Akishev M, Saparbayev S, Umbayev B, Askarova S. The Effects of Mobile Phone Radiofrequency Electromagnetic Fields on β-Amyloid-Induced Oxidative Stress in Human and Rat Primary Astrocytes. Neuroscience 2019; 408:46-57. [PMID: 30953670 DOI: 10.1016/j.neuroscience.2019.03.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 03/26/2019] [Accepted: 03/27/2019] [Indexed: 12/25/2022]
Abstract
Amyloid beta peptide (Aβ) is implicated in the development of pathological reactions associated with Alzheimer's disease (AD), such as oxidative stress, neuro-inflammation and death of brain cells. Current pharmacological approaches to treat AD are not able to control the deposition of Aβ and suppression of Aβ-induced cellular response. There is a growing body of evidence that exposure to radiofrequency electromagnetic field (RF-EMF) causes a decrease of beta-amyloid deposition in the brains and provides cognitive benefits to Alzheimer's Tg mice. Herein, we investigated the effects of mobile phone radiofrequency EMF of 918 MHz on reactive oxygen species (ROS) formation, mitochondrial membrane potential (MMP), activity of NADPH-oxidase, and phosphorylation of p38MAPK and ERK1/2 kinases in human and rat primary astrocytes in the presence of Aβ42 and H2O2. Our data demonstrate that EMF is able to reduce Aβ42- and H2O2-induced cellular ROS, abrogate Aβ₄₂-induced production of mitochondrial ROS and the co-localization between the cytosolic (p47-phox) and membrane (gp91-phox) subunits of NADPH oxidase, while increasing MMP, and inhibiting H2O2-induced phosphorylation of p38MAPK and ERK1/2 in primary astrocytes. Yet, EMF was not able to modulate alterations in the phosphorylation state of the MAPKs triggered by Aβ42. Our findings provide an insight into the mechanisms of cellular and molecular responses of astrocytes on RF-EMF exposure and indicate the therapeutic potential of RF-EMF for the treatment of Alzheimer's disease.
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Affiliation(s)
- Andrey Tsoy
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan
| | - Timur Saliev
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan; S.D. Asfendiyarov Kazakh National Medical University, Tole Bi Street 94, Almaty, 050000, Kazakhstan
| | - Elvira Abzhanova
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan
| | - Anel Turgambayeva
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan
| | - Aiym Kaiyrlykyzy
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan
| | - Mars Akishev
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan
| | - Samat Saparbayev
- National Scientific Medical Center, 42 Abylai Khan Ave, Astana, 010000, Kazakhstan, 010009
| | - Bauyrzhan Umbayev
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan
| | - Sholpan Askarova
- National Laboratory Astana, Nazarbayev University, 53 Kabanbay batyr Ave., Astana, 010000, Kazakhstan.
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13
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Ren L, Wei C, Li K, Lu Z. LncRNA MALAT1 up-regulates VEGF-A and ANGPT2 to promote angiogenesis in brain microvascular endothelial cells against oxygen-glucose deprivation via targetting miR-145. Biosci Rep 2019; 39:BSR20180226. [PMID: 30038058 PMCID: PMC6400790 DOI: 10.1042/bsr20180226] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 02/07/2018] [Accepted: 09/07/2018] [Indexed: 01/17/2023] Open
Abstract
Stroke is one of the leading causes of death and long-term disability around the world. Angiogenesis is supposed to protect brain microvascular endothelial cells (BMECs) from oxidative and ischemic stress. Previous studies indicated that interaction between metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) and miR-145 was involved in myocardial ischemia reperfusion, suggesting MALAT1 and miR-145 were also mediated with the progress of angiogenesis and cell migration in oxygen-glucose deprivation (OGD)-induced BMECs. The present study aimed to investigate the functional roles of MALAT1 in regulating miR-145 and its downstream pro-angiogenesis factors, vascular endothelial growth factor (VEGF)-A and Angiopoietin-2 (ANGPT2) during the progress of angiogenesis in OGD-induced BMECs. An in vitro OGD model was employed in mouse BMECs to mimic brain hypoxic and ischemic conditions; MTT was used to determine cell viability. qRT-PCR was used to determine the expression of long non-coding RNA (lncRNA)-MALAT1 and miR-145 under OGD conditions; in vitro tube formation assay was used to investigate angiogenic effect of MALAT1 and miR-145 The relationship between lncRNA-MALAT1/miR-145 and miR-145/VEGF-A/ANGPT2 was evaluated by qRT-PCR and Western blot, and direct binding was assessed using dual luciferase assay. Results showed that the levels of lncRNA-MALAT1 and miR-145 were up-regulated in OGD-induced BMECs. miR-145 functioned as an anti-angiogenic and pro-apoptotic factor in OGD treated BMECs via down-regulating VEGF-A and ANGPT2 directly. While lncRNA-MALAT1 enhanced the expressions of VEGF-A and ANGPT2 by targetting miR-145 to promote angiogenesis and proliferation of BMECs under OGD conditions. Our present study revealed the inhibitory functions of miR-145 on angiogenesis through direct targetting on VEGF-A and ANGPT2 for the first time and proved the protective role of lncRNA-MALAT1 for BMECs under OGD conditions through the direct regulation of miR-145.
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Affiliation(s)
- Lanfen Ren
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, P.R. China
| | - Chunxia Wei
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, P.R. China
| | - Kui Li
- Department of Cardiovascular Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, P.R. China
| | - Zuneng Lu
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, P.R. China
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14
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Zhu L, Lin M, Ma J, Liu W, Gao L, Wei S, Xue Y, Shang X. The role of LINC00094/miR-224-5p (miR-497-5p)/Endophilin-1 axis in Memantine mediated protective effects on blood-brain barrier in AD microenvironment. J Cell Mol Med 2019; 23:3280-3292. [PMID: 30801976 PMCID: PMC6484416 DOI: 10.1111/jcmm.14214] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 12/19/2018] [Accepted: 01/20/2019] [Indexed: 12/16/2022] Open
Abstract
The dysfunction of the blood-brain barrier (BBB) is one of the main pathological features of Alzheimer's disease (AD). Memantine (MEM), an N-methyl-d-aspartate (NMDA) receptor antagonist, has been reported that been used widely for AD therapy. This study was performed to demonstrate the role of the MEM in regulating BBB permeability in AD microenvironment as well as its possible mechanisms. The present study showed that LINC00094 was dramatically increased in Abeta1-42 -incubated microvascular endothelial cells (ECs) of BBB model in vitro. Besides, it was decreased in MEM-incubated ECs. Silencing LINC00094 significantly decreased BBB permeability, meanwhile up-regulating the expression of ZO-1, occludin and claudin-5. Furthermore, silencing LINC00094 enhance the effect of MEM on decreasing BBB permeability in AD microenvironment. The analysis of the mechanism demonstrated that reduction of LINC00094 inhibited Endophilin-1 expression by up-regulating miR-224-4p/miR-497-5p, promoted the expression of ZO-1, occludin and claudin-5, and ultimately alleviated BBB permeability in AD microenvironment. Taken together, the present study suggests that the MEM/LINC00094/miR-224-5p (miR-497-5p)/Endophilin-1 axis plays a crucial role in the regulation of BBB permeability in AD microenvironment. Silencing LINC00094 combined with MEM provides a novel target for the therapy of AD.
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Affiliation(s)
- Lu Zhu
- Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Meiqing Lin
- Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Jun Ma
- Department of Neurobiology, School of Life Sciences, China Medical University, Shenyang, China.,Key Laboratory of Cell Biology, Ministry of Public Health of China, China Medical University, Shenyang, China.,Key Laboratory of Medical Cell Biology, Ministry of Education of China, China Medical University, Shenyang, China
| | - Wenjing Liu
- Department of Geriatrics, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Lili Gao
- Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Shanshan Wei
- Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Yixue Xue
- Department of Neurobiology, School of Life Sciences, China Medical University, Shenyang, China.,Key Laboratory of Cell Biology, Ministry of Public Health of China, China Medical University, Shenyang, China.,Key Laboratory of Medical Cell Biology, Ministry of Education of China, China Medical University, Shenyang, China
| | - Xiuli Shang
- Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang, China
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15
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Huang S, Gong T, Zhang T, Wang X, Cheng Q, Li Y. Zhongfenggao Protects Brain Microvascular Endothelial Cells from Oxygen–Glucose Deprivation/Reoxygenation-Induced Injury by Angiogenesis. Biol Pharm Bull 2019; 42:222-230. [DOI: 10.1248/bpb.b18-00650] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Shenghui Huang
- College of Integrated Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine
- Department of Neurology, Affiliated Hospital of Gansu University of Chinese Medicine
- Institute of Integrative Medicine, Gansu University of Chinese Medicine
| | - Ting Gong
- Department of Encephalopathy, Gansu Provincial Hospital of Traditional Chinese Medicine
| | - Tengfei Zhang
- College of Integrated Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine
| | - Xinfeng Wang
- College of Integrated Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine
| | - Qianqian Cheng
- College of Integrated Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine
| | - Yanyi Li
- Department of Encephalopathy, Gansu Provincial Hospital of Traditional Chinese Medicine
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16
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Wang Z, Wang R, Wang K, Liu X. Upregulated long noncoding RNA Snhg1 promotes the angiogenesis of brain microvascular endothelial cells after oxygen–glucose deprivation treatment by targeting miR-199a. Can J Physiol Pharmacol 2018; 96:909-915. [PMID: 29883549 DOI: 10.1139/cjpp-2018-0107] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Angiogenesis after ischemic stroke has important clinical significance, which stimulates endogenous recovery mechanisms and improves the neurological outcome. Enhancing angiogenesis may facilitate the function recovery from ischemic stroke. Recent studies have shown that aberrant expression of long noncoding RNAs (lncRNAs) is related to angiogenesis after ischemic stroke. Snhg1, a cancer-related lncRNA, has been reported to be upregulated after stroke. However, little is known about its role in stroke. In this study, we performed in vitro experiments to investigate the effects of Snhg1 on cell survival and angiogenesis and molecular mechanism in ischemic stroke. Oxygen–glucose deprivation/reoxygenation (OGD/R) was used to mimic ischemia/reperfusion injury in vitro. Sngh1 was increased in brain microvascular endothelial cells (BMECs) with the prolongation of exposure to OGD, and promoted BMEC survival under OGD/R condition, and angiogenesis after OGD/R treatment. miR-199a was identified and validated to be a direct target of Snhg1, and function effects of Snhg1 on BMEC survival and angiogenesis depended on miR-199a, which is involved in the regulation of hypoxia inducible factor and vascular endothelial cell growth factor expression. These findings contribute to a better understanding of the pathogenesis of ischemic stroke and facilitate the development of proangiogenesis therapy for this disease.
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Affiliation(s)
- Zhengfeng Wang
- Department of Neurosurgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Ruihua Wang
- Department of Nuclear Medicine, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Kai Wang
- Department of Neurosurgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xianzhi Liu
- Department of Neurosurgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
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17
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d'Uscio LV, He T, Katusic ZS. Expression and Processing of Amyloid Precursor Protein in Vascular Endothelium. Physiology (Bethesda) 2017; 32:20-32. [PMID: 27927802 DOI: 10.1152/physiol.00021.2016] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Amyloid precursor protein (APP) is evolutionary conserved protein expressed in endothelial cells of cerebral and peripheral arteries. In this review, we discuss mechanisms responsible for expression and proteolytic cleavage of APP in endothelial cells. We focus on physiological and pathological implications of APP expression in vascular endothelium.
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Affiliation(s)
- Livius V d'Uscio
- Departments of Anesthesiology and Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Tongrong He
- Departments of Anesthesiology and Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Zvonimir S Katusic
- Departments of Anesthesiology and Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic College of Medicine, Rochester, Minnesota
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18
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Chen F, Ghosh A, Hu M, Long Y, Sun H, Kong L, Hong H, Tang S. RAGE-NF-κB-PPARγ Signaling is Involved in AGEs-Induced Upregulation of Amyloid-β Influx Transport in an In Vitro BBB Model. Neurotox Res 2017; 33:284-299. [PMID: 28871412 DOI: 10.1007/s12640-017-9784-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 11/25/2022]
Abstract
The receptor for advanced glycation end products (RAGE) at the blood-brain barrier (BBB) is critical for regulation of amyloid-β (Aβ) homeostasis in the diabetic brain. In this study, we used an in vitro BBB model consisting of mouse brain capillary endothelial cells (MBCECs) to investigate whether advanced glycation end products (AGEs) increase Aβ influx transport across the BBB and the underlying mechanisms. We found that AGEs induced Aβ influx transport across the BBB in concentration- and time-dependent manner, accompanied by increased RAGE expression and nuclear factor-kappa B p65 (NF-κB p65), and decreased nuclear peroxisome proliferator-activated receptor γ (PPARγ). Blockade of RAGE with its antibody and inhibition of NF-κB signaling with PDTC as well as activation of PPARγ with rosiglitazone significantly decreased Aβ transport across the BBB from the periphery to the brain. These treatments also pronouncedly suppressed AGEs-induced increases in RAGE expression and nuclear NF-κB p65 and reversed the decrease in nuclear PPARγ. These results suggest that RAGE-NF-κB-PPARγ signaling is involved in regulation of AGEs-induced influx transport of Aβ across the BBB and targeting the signaling pathway could serve as a novel strategy to modify such Aβ transport.
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Affiliation(s)
- Fang Chen
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Arijit Ghosh
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
- Department of Biomedical Sciences, City University of Hong Kong, HKSAR, China
| | - Mei Hu
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Yan Long
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Hongbin Sun
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Lingyi Kong
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Hao Hong
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China.
| | - Susu Tang
- Department of Pharmacology, Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases, and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China.
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19
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Vascular protective effects of KLF2 on Aβ-induced toxicity: Implications for Alzheimer’s disease. Brain Res 2017; 1663:174-183. [DOI: 10.1016/j.brainres.2017.01.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Revised: 12/29/2016] [Accepted: 01/02/2017] [Indexed: 11/19/2022]
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20
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Li Z, Li J, Tang N. Long noncoding RNA Malat1 is a potent autophagy inducer protecting brain microvascular endothelial cells against oxygen-glucose deprivation/reoxygenation-induced injury by sponging miR-26b and upregulating ULK2 expression. Neuroscience 2017; 354:1-10. [PMID: 28433650 DOI: 10.1016/j.neuroscience.2017.04.017] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 04/04/2017] [Accepted: 04/12/2017] [Indexed: 12/30/2022]
Abstract
Brain microvascular endothelial cell (BMEC) injury induced by ischemia-reperfusion (I/R) is the initial stage of blood-brain barrier (BBB) disruption, which results in a poor prognosis in ischemic stroke patients. Autophagy has been shown to have protective effects on BMECs against cerebral ischemic insults. However, molecular mechanism of BMEC autophagy during I/R is unclear. Long noncoding RNAs (lncRNAs) are emerging as new factors involved in cell autophagy. LncRNA Malat1 is one of the most highly upregulated I/R or OGD/R-responsive endothelial lncRNA and plays a protective role in BMECs against cerebral ischemic insults. Oxygen-glucose deprivation/reoxygenation (OGD/R) is used to mimic I/R injury in vitro. Based on these findings, we hypothesized that Malat1 might play a protective role by enhancing BMEC autophagy. We performed GFP-LC3 puncta formation, LC3 conversion, p62 expression, and cell death assays, and the results were consistent with our hypothesis that Malat1 promoted BMEC autophagy and survival under OGD/R condition. We further explored the molecular mechanisms by which Malat1 exerted regulatory effects, and found that Malat1 served as an endogenous sponge to downregulate miR-26b expression by binding directly to miR-26b. Furthermore, Malat1 overturned the inhibitory effect of miR-26b on BMEC autophagy and survival, which involved in promoting the expression of miR-26b target ULK2. Collectively, our study illuminated a new Malat1-miR-26b-ULK2 regulatory axis in which Malat1 served as a competing endogenous RNA by sponging miR-26b and upregulating ULK2 expression, thereby promoting BMEC autophagy and survival under OGD/R condition.
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Affiliation(s)
- Zhijun Li
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430010, China.
| | - Jing Li
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430010, China
| | - Na Tang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430010, China
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21
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You F, Li Q, Jin G, Zheng Y, Chen J, Yang H. Genistein protects against Aβ 25-35 induced apoptosis of PC12 cells through JNK signaling and modulation of Bcl-2 family messengers. BMC Neurosci 2017; 18:12. [PMID: 28081713 PMCID: PMC5234099 DOI: 10.1186/s12868-016-0329-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 12/27/2016] [Indexed: 01/22/2023] Open
Abstract
Background Deposition of aggregated amyloid beta (Aβ) protein is hallmark of Alzheimer’s disease, leading to dysfunction and apoptosis of neurons. The isoflavone phytoestrogen compound genistein (Gen) exerts a significant protective effect against Aβ25–35 induced neurotoxicity and mitochondrial damage in rat pheochromocytoma (PC12) cells. However, the mechanisms underlying Gen’s rescue remain elusive. Therefore we endeavored to research further the molecular mechanisms underlying Gen’s inhibition of Aβ25–35 induced apoptosis of neurons. Results We found that Gen dramatically suppressed the activation by Aβ25–35 of p-c-Jun N-terminal kinase (p-JNK), and also inhibited the JNK-dependent decreased of Bcl-w and increased of Bim. Furthermore, Gen significantly reduced the cytoplasmic concentrations of cytochrome c and Smac protein as well as caspase-3 activity. Additionally, pretreatment with JNK inhibitor SP600125 effectively suppressed Aβ25–35 induced PC12 cell cytotoxicity. Conclusion Taken together, the results suggested that Gen protects PC12 cells from Aβ25–35 induced neurotoxicity by interfering with p-JNK activation, thus attenuating the JNK-dependent apoptosis through the mitochondrial pathway. These findings constitute novel insights into the pathway for Aβ25–35 toxicity, and the neuroprotective action of Gen. Electronic supplementary material The online version of this article (doi:10.1186/s12868-016-0329-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Fuling You
- Basic Medical College, Guangdong Pharmaceutical University, Guangzhou, 510006, Guangdong, China
| | - Qiao Li
- Basic Medical College, Guangdong Pharmaceutical University, Guangzhou, 510006, Guangdong, China
| | - Guifang Jin
- Basic Medical College, Guangdong Pharmaceutical University, Guangzhou, 510006, Guangdong, China
| | - Yaojie Zheng
- Basic Medical College, Guangdong Pharmaceutical University, Guangzhou, 510006, Guangdong, China
| | - Jingrong Chen
- Basic Medical College, Guangdong Pharmaceutical University, Guangzhou, 510006, Guangdong, China
| | - Hong Yang
- Basic Medical College, Guangdong Pharmaceutical University, Guangzhou, 510006, Guangdong, China.
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22
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MicroRNA-107 prevents amyloid-beta induced blood-brain barrier disruption and endothelial cell dysfunction by targeting Endophilin-1. Exp Cell Res 2016; 343:248-257. [DOI: 10.1016/j.yexcr.2016.03.026] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 03/25/2016] [Accepted: 03/29/2016] [Indexed: 11/21/2022]
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23
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Zhang J, Yuan L, Zhang X, Hamblin MH, Zhu T, Meng F, Li Y, Chen YE, Yin KJ. Altered long non-coding RNA transcriptomic profiles in brain microvascular endothelium after cerebral ischemia. Exp Neurol 2015; 277:162-170. [PMID: 26746985 DOI: 10.1016/j.expneurol.2015.12.014] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 12/16/2015] [Accepted: 12/22/2015] [Indexed: 11/18/2022]
Abstract
The brain endothelium is an important therapeutic target for the inhibition of cerebrovascular dysfunction in ischemic stroke. Previously, we documented the important regulatory roles of microRNAs in the cerebral vasculature, in particular the cerebral vascular endothelium. However, the functional significance and molecular mechanisms of other classes of non-coding RNAs in the regulation of cerebrovascular endothelial pathophysiology after stroke are completely unknown. Using RNA sequencing (RNA-seq) technology, we profiled long non-coding RNA (lncRNA) expressional signatures in primary brain microvascular endothelial cells (BMECs) after oxygen-glucose deprivation (OGD), an in vitro mimic of ischemic stroke conditions. After 16h of OGD exposure, the expression levels for 362 of the 10,677 lncRNAs analyzed changed significantly, including a total of 147 lncRNAs increased and 70 lncRNAs decreased by more than 2-fold. Among them, the most highly upregulated lncRNAs include Snhg12, Malat1, and lnc-OGD 1006, whereas the most highly downregulated lncRNAs include 281008D09Rik, Peg13, and lnc-OGD 3916. Alteration of the most highly upregulated/downregulated ODG-responsive lncRNAs was further confirmed in cultured BMECs after OGD as well as isolated cerebral microvessels in mice following transient middle cerebral artery occlusion (MCAO) and 24h reperfusion by the quantitative real-time PCR approach. Moreover, promoter analysis of altered ODG-responsive endothelial lncRNA genes by bioinformatics showed substantial transcription factor binding sites on lncRNAs, implying potential transcriptional regulation of those lncRNAs. These findings are the first to identify OGD-responsive brain endothelial lncRNAs, which suggest potential pathological roles for these lncRNAs in mediating endothelial responses to ischemic stimuli. Endothelial-selective lncRNAs may function as a class of novel master regulators in cerebrovascular endothelial pathologies after ischemic stroke.
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Affiliation(s)
- J Zhang
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI 48109, USA
| | - L Yuan
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI 48109, USA
| | - X Zhang
- Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - M H Hamblin
- Department of Pharmacology, Tulane University School of Medicine, 1430 Tulane Avenue SL83, New Orleans, LA 70112, USA
| | - T Zhu
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI 48109, USA
| | - F Meng
- Department of Psychiatry, Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Y Li
- Key Lab of Systems Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Y E Chen
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI 48109, USA; Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI 48109, USA.
| | - K J Yin
- Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA.
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Sionov RV, Vlahopoulos SA, Granot Z. Regulation of Bim in Health and Disease. Oncotarget 2015; 6:23058-134. [PMID: 26405162 PMCID: PMC4695108 DOI: 10.18632/oncotarget.5492] [Citation(s) in RCA: 140] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 08/08/2015] [Indexed: 11/25/2022] Open
Abstract
The BH3-only Bim protein is a major determinant for initiating the intrinsic apoptotic pathway under both physiological and pathophysiological conditions. Tight regulation of its expression and activity at the transcriptional, translational and post-translational levels together with the induction of alternatively spliced isoforms with different pro-apoptotic potential, ensure timely activation of Bim. Under physiological conditions, Bim is essential for shaping immune responses where its absence promotes autoimmunity, while too early Bim induction eliminates cytotoxic T cells prematurely, resulting in chronic inflammation and tumor progression. Enhanced Bim induction in neurons causes neurodegenerative disorders including Alzheimer's, Parkinson's and Huntington's diseases. Moreover, type I diabetes is promoted by genetically predisposed elevation of Bim in β-cells. On the contrary, cancer cells have developed mechanisms that suppress Bim expression necessary for tumor progression and metastasis. This review focuses on the intricate network regulating Bim activity and its involvement in physiological and pathophysiological processes.
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Affiliation(s)
- Ronit Vogt Sionov
- Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel Canada, Hebrew University, Hadassah Medical School, Jerusalem, Israel
| | - Spiros A. Vlahopoulos
- First Department of Pediatrics, University of Athens, Horemeio Research Laboratory, Thivon and Levadias, Goudi, Athens, Greece
| | - Zvi Granot
- Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel Canada, Hebrew University, Hadassah Medical School, Jerusalem, Israel
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Wang H, Fan L, Wang H, Ma X, Du Z. Amyloid β regulates the expression and function of AIP1. J Mol Neurosci 2014; 55:227-232. [PMID: 24985705 PMCID: PMC4289935 DOI: 10.1007/s12031-014-0310-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 04/14/2014] [Indexed: 11/28/2022]
Abstract
Apoptosis signal-regulating kinase 1–interacting (ASK1-interacting) protein-1 (AIP1) is a newly identified novel member of the Ras GTPase-activating protein family, which has been implicated in cell growth inhibition and cell apoptosis. However, the effects of AIP1 in Alzheimer’s disease (AD) are unknown. In the present study, we found that AIP1 was elevated in the brain of AD Tg2576 mice and Aβ1-42 treated brain cerebral microvascular endothelial cells (CECs). Aβ1-42 treatment induced the interaction of AIP1 and apoptosis signal-regulating kinase 1 (ASK1), which led to dissociation of ASK1 and its inhibitor 14-3-3. Dissociation of ASK1 from 14-3-3 leads to ASK1 activation. Indeed, Aβ1-42 dephosphorylated ASK1 at Ser-967, suggesting that Aβ1-42 increased ASK1 activity. Importantly, disassociation of ASK1 and 14-3-3 induced by Aβ1–42 could be rescued by silence of AIP1. In addition, down-regulation of AIP1 also led to attenuation of the activation of JNK, as well as p53, downstream signaling targets of ASK1. AIP1 silencing attenuated the pro-apoptotic effects of Aβ1-42 on CECs. We propose that AIP1 mediates Aβ induced ASK1 activation by facilitating dissociation of 14-3-3, suggesting a novel mechanism for Aβ-induced apoptosis in CECs.
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Affiliation(s)
- Huaiming Wang
- Department of Neurology, The 89th Hospital of People's Liberation Army, 256 Beigong west Street, Weifang, 261045, Shandong Province, China
| | - Lijing Fan
- Department of Neurology, The 89th Hospital of People's Liberation Army, 256 Beigong west Street, Weifang, 261045, Shandong Province, China
| | - Hong Wang
- Department of Neurology, The 89th Hospital of People's Liberation Army, 256 Beigong west Street, Weifang, 261045, Shandong Province, China
| | - Xixin Ma
- Department of medicine, Shandong Province Weifang Brain hospital, Weifang, China
| | - Zhongde Du
- Department of Neurology, The 89th Hospital of People's Liberation Army, 256 Beigong west Street, Weifang, 261045, Shandong Province, China.
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26
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Vannuvel K, Renard P, Raes M, Arnould T. Functional and morphological impact of ER stress on mitochondria. J Cell Physiol 2013; 228:1802-18. [PMID: 23629871 DOI: 10.1002/jcp.24360] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 03/04/2013] [Indexed: 12/15/2022]
Abstract
Over the past years, knowledge and evidence about the existence of crosstalks between cellular organelles and their potential effects on survival or cell death have been constantly growing. More recently, evidence accumulated showing an intimate relationship between endoplasmic reticulum (ER) and mitochondria. These close contacts not only establish extensive physical links allowing exchange of lipids and calcium but they can also coordinate pathways involved in cell life and death. It is now obvious that ER dysfunction/stress and unfolded protein response (UPR) as well as mitochondria play major roles in apoptosis. However, while the effects of major ER stress on cell death have been largely studied and reviewed, it becomes more and more evident that cells might regularly deal with sublethal ER stress, a condition that does not necessarily lead to cell death but might affect the function/activity of other organelles such as mitochondria. In this review, we will particularly focus on these new, interesting and intriguing metabolic and morphological events that occur during the early adaptative phase of the ER stress, before the onset of cell death, and that remain largely unknown. Relevance and implication of these mitochondrial changes in response to ER stress conditions for human diseases such as type II diabetes and Alzheimer's disease will also be considered.
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Affiliation(s)
- Kayleen Vannuvel
- Laboratory of Biochemistry and Cellular Biology, URBC-NARILIS, University of Namur, Namur, Belgium
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Nagai N, Ito Y. Excessive hydrogen peroxide enhances the attachment of amyloid β1-42 in the lens epithelium of UPL rats, a hereditary model for cataracts. Toxicology 2013; 315:55-64. [PMID: 23941810 DOI: 10.1016/j.tox.2013.08.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 08/03/2013] [Accepted: 08/03/2013] [Indexed: 01/09/2023]
Abstract
Several studies have reported that hydrogen peroxide (H2O2) is related to the toxicity of amyloid β (Aβ), and that the accumulation of Aβ in the lenses of humans causes lens opacification. In this study, we investigate the accumulation of Aβ1-42 in the lenses of UPL rats, which then leads to lens opacification. In addition, we demonstrate the effect of disulfiram eye drops (DSF), a potent radical scavenger, on Aβ1-42 accumulation in the lenses of UPL rats. The H2O2 levels in 46- to 60-day-old UPL rat lenses are significantly higher than in normal rats, and the Aβ1-42 levels in 53- and 60-day-old UPL rats are also increased only in lens epithelium containing capsules (capsule-epithelium), not in the lens cortex and nucleus. However, no increases in amyloid precursor protein (APP), β- or γ-secretase mRNA were observed in lenses of the corresponding ages. It has been thought that Aβ1-42 that accumulates in the lenses of UPL rats is actually produced in another tissue containing neuronal cells, such as brain or retina. Aβ1-42 levels in the brain and retina rise with aging, and the levels of APP, β- and γ-secretase mRNA in the retinas of 53-day-old UPL rats with opaque lenses are significantly higher than in 25-day-old UPL rats with transparent lenses. In contrast to the results in retinas, the levels of APP, β- and γ-secretase mRNA in the brains of 25- and 53-day-old UPL rats are similar. On the other hand, in an in vitro study, Aβ1-42 attachment in the lens capsule-epithelium of UPL rats was found to increase in H2O2. In addition, in an in vivo study, the inhibition of H2O2 by DSF was found to attenuate the increase in Aβ1-42 in the lens capsule-epithelium of 60-day-old UPL rats. Taken together, we hypothesize that excessive H2O2 in the lens enhances the attachment of Aβ1-42 in the lens capsule-epithelium of UPL rats, and that the instillation of DSF has the ability to attenuate the attachment of Aβ1-42 by inhibiting H2O2 production in lens. These findings provide significant information that can be used to design further studies aimed at developing anti-cataract drugs.
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Affiliation(s)
- Noriaki Nagai
- Faculty of Pharmacy, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yoshimasa Ito
- Faculty of Pharmacy, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
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Cheng C, Li W, Zhang Z, Yoshimura S, Hao Q, Zhang C, Wang Z. MicroRNA-144 is regulated by activator protein-1 (AP-1) and decreases expression of Alzheimer disease-related a disintegrin and metalloprotease 10 (ADAM10). J Biol Chem 2013; 288:13748-61. [PMID: 23546882 DOI: 10.1074/jbc.m112.381392] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND MicroRNA (miR) dysregulation is found in Alzheimer disease (AD). A disintegrin and metalloprotease 10 (ADAM10) prevents generation of amyloid β (Aβ) and decrease AD pathology. RESULTS miR-144 suppresses ADAM10 expression and is up-regulated by activator protein-1. CONCLUSION miR-144 is a negative regulator of ADAM10 and may be involved in AD pathogenesis. SIGNIFICANCE The first work to demonstrate the function of miRNA-144 and its regulation in the pathogenesis of AD. Amyloid β-peptide (Aβ) accumulating in the brain of Alzheimer disease (AD) patients is believed to be the main pathophysiologcal cause of the disease. Proteolytic processing of the amyloid precursor protein by α-secretase ADAM10 (a disintegrin and metalloprotease 10) protects the brain from the production of the Aβ. Meanwhile, dysregulation or aberrant expression of microRNAs (miRNAs) has been widely documented in AD patients. In this study, we demonstrated that overexpression of miR-144, which was previously reported to be increased in elderly primate brains and AD patients, significantly decreased activity of the luciferase reporter containing the ADAM10 3'-untranslated region (3'-UTR) and suppressed the ADAM10 protein level, whereas the miR-144 inhibitor led to an increase of the luciferase activity. The negative regulation caused by miR-144 was strictly dependent on the binding of the miRNA to its recognition element in the ADAM10 3'-UTR. Moreover, we also showed that activator protein-1 regulates the transcription of miR-144 and the up-regulation of miR-144 at least partially induces the suppression of the ADAM10 protein in the presence of Aβ. In addition, we found that miR-451, a miRNA processed from a single gene locus with miR-144, is also involved in the regulation of ADAM10 expression. Taken together, our data therefore demonstrate miR-144/451 is a negative regulator of the ADAM10 protein and suggest a mechanistic role for miR-144/451 in AD pathogenesis.
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Affiliation(s)
- Cong Cheng
- Protein Science Key Laboratory of the Ministry of Education, School of Medicine, Tsinghua University, Beijing 100084, PR China
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Yin KJ, Fan Y, Hamblin M, Zhang J, Zhu T, Li S, Hawse JR, Subramaniam M, Song CZ, Urrutia R, Lin JD, Chen YE. KLF11 mediates PPARγ cerebrovascular protection in ischaemic stroke. ACTA ACUST UNITED AC 2013; 136:1274-87. [PMID: 23408111 DOI: 10.1093/brain/awt002] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Peroxisome proliferator-activated receptor gamma (PPARγ) is emerging as a major regulator in neurological diseases. However, the role of (PPARγ) and its co-regulators in cerebrovascular endothelial dysfunction after stroke is unclear. Here, we have demonstrated that (PPARγ) activation by pioglitazone significantly inhibited both oxygen-glucose deprivation-induced cerebral vascular endothelial cell death and middle cerebral artery occlusion-triggered cerebrovascular damage. Consistent with this finding, selective (PPARγ) genetic deletion in vascular endothelial cells resulted in increased cerebrovascular permeability and brain infarction in mice after focal ischaemia. Moreover, we screened for (PPARγ) co-regulators using a genome-wide and high-throughput co-activation system and revealed KLF11 as a novel (PPARγ) co-regulator, which interacted with (PPARγ) and regulated its function in mouse cerebral vascular endothelial cell cultures. Interestingly, KLF11 was also found as a direct transcriptional target of (PPARγ). Furthermore, KLF11 genetic deficiency effectively abolished pioglitazone cytoprotection in mouse cerebral vascular endothelial cell cultures after oxygen-glucose deprivation, as well as pioglitazone-mediated cerebrovascular protection in a mouse middle cerebral artery occlusion model. Mechanistically, we demonstrated that KLF11 enhanced (PPARγ) transcriptional suppression of the pro-apoptotic microRNA-15a (miR-15a) gene, resulting in endothelial protection in cerebral vascular endothelial cell cultures and cerebral microvasculature after ischaemic stimuli. Taken together, our data demonstrate that recruitment of KLF11 as a novel (PPARγ) co-regulator plays a critical role in the cerebrovascular protection after ischaemic insults. It is anticipated that elucidating the coordinated actions of KLF11 and (PPARγ) will provide new insights into understanding the molecular mechanisms underlying (PPARγ) function in the cerebral vasculature and help to develop a novel therapeutic strategy for the treatment of stroke.
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Affiliation(s)
- Ke-Jie Yin
- Cardiovascular Centre, Department of Internal Medicine, University of Michigan Medical Centre, NCRC Bld 26, Rm 361S, 2800 Plymouth Rd, Ann Arbor, MI 48109, USA
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Alzheimer disease as a vascular disorder: Where do mitochondria fit? Exp Gerontol 2012; 47:878-86. [DOI: 10.1016/j.exger.2012.07.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Revised: 07/12/2012] [Accepted: 07/13/2012] [Indexed: 12/26/2022]
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31
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Diallyl trisulfide induces apoptosis in human breast cancer cells through ROS-mediated activation of JNK and AP-1. Biochem Pharmacol 2012; 84:1241-50. [DOI: 10.1016/j.bcp.2012.08.024] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 08/27/2012] [Accepted: 08/29/2012] [Indexed: 11/20/2022]
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32
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Renin inhibitor aliskiren exerts neuroprotection against amyloid beta-peptide toxicity in rat cortical neurons. Neurochem Int 2012; 61:369-77. [DOI: 10.1016/j.neuint.2012.05.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 04/24/2012] [Accepted: 05/09/2012] [Indexed: 12/20/2022]
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33
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Chen SD, Yang DI, Lin TK, Shaw FZ, Liou CW, Chuang YC. Roles of oxidative stress, apoptosis, PGC-1α and mitochondrial biogenesis in cerebral ischemia. Int J Mol Sci 2011; 12:7199-215. [PMID: 22072942 PMCID: PMC3211033 DOI: 10.3390/ijms12107199] [Citation(s) in RCA: 255] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 10/12/2011] [Accepted: 10/19/2011] [Indexed: 12/12/2022] Open
Abstract
The primary physiological function of mitochondria is to generate adenosine triphosphate through oxidative phosphorylation via the electron transport chain. Overproduction of reactive oxygen species (ROS) as byproducts generated from mitochondria have been implicated in acute brain injuries such as stroke from cerebral ischemia. It was well-documented that mitochondria-dependent apoptotic pathway involves pro- and anti-apoptotic protein binding, release of cytochrome c, leading ultimately to neuronal death. On the other hand, mitochondria also play a role to counteract the detrimental effects elicited by excessive oxidative stress. Recent studies have revealed that oxidative stress and the redox state of ischemic neurons are also implicated in the signaling pathway that involves peroxisome proliferative activated receptor-γ (PPARγ) co-activator 1α (PGC1-α). PGC1-α is a master regulator of ROS scavenging enzymes including manganese superoxide dismutase 2 and the uncoupling protein 2, both are mitochondrial proteins, and may contribute to neuronal survival. PGC1-α is also involved in mitochondrial biogenesis that is vital for cell survival. Experimental evidence supports the roles of mitochondrial dysfunction and oxidative stress as determinants of neuronal death as well as endogenous protective mechanisms after stroke. This review aims to summarize the current knowledge focusing on the molecular mechanisms underlying cerebral ischemia involving ROS, mitochondrial dysfunction, apoptosis, mitochondrial proteins capable of ROS scavenging, and mitochondrial biogenesis.
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Affiliation(s)
- Shang-Der Chen
- Department of Neurology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan
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Askarova S, Yang X, Sheng W, Sun GY, Lee JCM. Role of Aβ-receptor for advanced glycation endproducts interaction in oxidative stress and cytosolic phospholipase A₂ activation in astrocytes and cerebral endothelial cells. Neuroscience 2011; 199:375-85. [PMID: 21978883 DOI: 10.1016/j.neuroscience.2011.09.038] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 08/23/2011] [Accepted: 09/14/2011] [Indexed: 12/22/2022]
Abstract
Blood-brain barrier (BBB) dysfunctions have been implicated in the progression of Alzheimer's disease. Cerebral endothelial cells (CECs) and astrocytes are the main cell components of the BBB. Although amyloid-β oligomers (Aβ₄₂) have been reported to mediate oxidative damage to the CECs and astrocytes and trigger the downstream mitogen-activated protein kinase/extracellular signal-regulated kinase (MAPK/ERK) pathway, the cell surface binding site for Aβ₄₂ and exact sequence of these events have yet to be elucidated. In this study, the receptor for advanced glycation endproducts (RAGE) was postulated to function as a signal transducing cell surface receptor for Aβ₄₂ to induce reactive oxygen species (ROS) generation from NADPH oxidase and trigger downstream pathways for the phosphorylation of extracellular signal-regulated kinases (ERK1/2) and cytosolic phospholipase A₂ (cPLA₂). We found that Aβ₄₂ competed with the anti-RAGE antibody (Ab(RAGE)) to bind to RAGE on the surfaces of CECs and primary astrocytes. In addition, Ab(RAGE) abrogate Aβ₄₂-induced ROS production and the colocalization between the cytosolic (p47-phox) and membrane (gp91-phox) subunits of NADPH oxidase in both cell types. Ab(RAGE) as well as NADPH oxidase inhibitor and ROS scavenger suppressed Aβ₄₂-induced ERK1/2 and cPLA₂ phosphorylation in CECs. At the same time, only Ab(RAGE), but neither NADPH oxidase inhibitor nor ROS scavenger, inhibited the ERK1/2 pathway and cPLA₂ phosphorylation in primary astrocytes. Therefore, this study demonstrates that NADPH oxidase complex assembly and ROS production are not required for Aβ₄₂ binding to RAGE at astrocytic surface leading to sequential phosphorylation of ERK1/2 and cPLA₂, and suggests the presence of two different RAGE-dependent downstream pathways in the CECs and astrocytes.
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Affiliation(s)
- S Askarova
- Department of Biological Engineering, University of Missouri, Columbia, Missouri 65211, USA
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35
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Chiu WT, Shen SC, Yang LY, Chow JM, Wu CY, Chen YC. Inhibition of HSP90-dependent telomerase activity in amyloid β-induced apoptosis of cerebral endothelial cells. J Cell Physiol 2011; 226:2041-51. [DOI: 10.1002/jcp.22536] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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36
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Aβ accumulation in choroid plexus is associated with mitochondrial-induced apoptosis. Neurobiol Aging 2010; 31:1569-81. [DOI: 10.1016/j.neurobiolaging.2008.08.017] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Revised: 08/05/2008] [Accepted: 08/24/2008] [Indexed: 01/04/2023]
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37
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Chen KL, Yuan RY, Hu CJ, Hsu CY. Amyloid-β peptide alteration of tau exon-10 splicing via the GSK3β-SC35 pathway. Neurobiol Dis 2010; 40:378-85. [PMID: 20615469 DOI: 10.1016/j.nbd.2010.06.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Revised: 06/11/2010] [Accepted: 06/26/2010] [Indexed: 10/19/2022] Open
Abstract
Amyloid-beta peptide (Aβ) and Tau protein are the lead constituents in the pathogenesis of Alzheimer's disease (AD). However, their inter-relationship in the disease process remains to be established. Tauopathy refers to a characteristic neurodegenerative process in AD. In tauopathy, Tau accumulates as a consequence of altered pre-mRNA splicing of tau exon 10, resulting in 3R (without exon 10)/4R (with exon 10) imbalance. We studied Aβ effects on tau exon 10 pre-mRNA splicing and relevant signaling events. This is the first demonstration of Aβ alteration of tau exon 10 splicing with an increase in 3R/4R ratio caused by reduced 4R expression. This Aβ action is causally related to its activation of GSK-3β which in turn phosphorylates SC35, an enhancer in tau exon 10 splicing. The establishment of the Aβ-GSK-3β-SC35 cascade broadens insight into development of novel strategies to modulate Aβ action on tau exon 10 splicing for possible prevention of tauopathy.
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Affiliation(s)
- Kun-Lin Chen
- The Department of Medical Education and Research, Shih Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
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38
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Li C, Xing G, Dong M, Zhou L, Li J, Wang G, Zou D, Wang R, Liu J, Niu Y. Beta-asarone protection against beta-amyloid-induced neurotoxicity in PC12 cells via JNK signaling and modulation of Bcl-2 family proteins. Eur J Pharmacol 2010; 635:96-102. [DOI: 10.1016/j.ejphar.2010.03.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 02/15/2010] [Accepted: 03/03/2010] [Indexed: 12/14/2022]
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Membrane biophysics and mechanics in Alzheimer's disease. Mol Neurobiol 2010; 41:138-48. [PMID: 20437210 DOI: 10.1007/s12035-010-8121-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Accepted: 03/17/2010] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease is a chronic neurodegenerative disorder characterized by neuronal loss, cerebrovascular inflammation, and accumulation of senile plaques in the brain parenchyma and cerebral blood vessels. Amyloid-beta peptide (Abeta), a major component of senile plaques, has been shown to exert multiple toxic effects to neurons, astrocytes, glial cells, and brain endothelium. Oligomeric Abeta can disturb the structure and function of cell membranes and alter membrane mechanical properties, such as membrane fluidity and molecular order. Much of these effects are attributed to their capability to trigger oxidative stress and inflammation. In this review, we discuss the effects of Abeta on neuronal cells, astrocytes, and cerebral endothelial cells with special emphasis on cell membrane properties and cell functions.
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Rizzo MT, Leaver HA. Brain Endothelial Cell Death: Modes, Signaling Pathways, and Relevance to Neural Development, Homeostasis, and Disease. Mol Neurobiol 2010; 42:52-63. [DOI: 10.1007/s12035-010-8132-6] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Accepted: 04/05/2010] [Indexed: 12/31/2022]
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41
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Hsu MJ, Chang CK, Chen MC, Chen BC, Ma HP, Hong CY, Lin CH. Apoptosis signal-regulating kinase 1 in peptidoglycan-induced COX-2 expression in macrophages. J Leukoc Biol 2010; 87:1069-82. [PMID: 20200402 DOI: 10.1189/jlb.1009668] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
In this study, we investigated the role of ASK1 in PGN-induced C/EBPbeta activation and COX-2 expression in RAW 264.7 macrophages. The PGN-induced COX-2 expression was attenuated by the DNs of ASK1, JNK1, JNK2, a JNK inhibitor (SP600125), and an AP-1 inhibitor (curcumin). PGN caused ASK1 dephosphorylation time-dependently at Ser967, dissociation from the ASK1-14-3-3 complex, and subsequent ASK1 activation. In addition, PGN activated PP2A and suppression of PP2A by okadaic acid markedly inhibited PGN-induced ASK1 Ser967 dephosphorylation and COX-2 expression. PGN induced the activation of the JNK-AP-1 signaling cascade downstream of ASK1. PGN-increased C/EBPbeta expression and DNA-binding activity were inhibited by the ASK1-JNK-AP-1 signaling blockade. COX-2 promoter luciferase activity induced by PGN was attenuated in cells transfected with the COX-2 reporter construct possessing the C/EBP-binding site mutation. In addition, the ASK1-JNK-AP-1-C/EBPbeta cascade was activated in human peripheral mononuclear cells exposure to PGN. The TLR2 agonist Pam(3)CSK(4) was also shown to induce ASK1 Ser967 dephosphorylation, JNK and c-jun phosphorylation, C/EBPbeta activation, and COX-2 expression in RAW 264.7 macrophages. PGN-induced COX-2 promoter luciferase activity was prevented by selective inhibition of TLR2 and c-Jun in RAW 264.7 macrophages. Our data demonstrate that PGN might activate the TLR2-mediated PP2A-ASK1-JNK-AP-1-C/EBPbeta cascade and subsequent COX-2 expression in RAW 264.7 macrophages.
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Affiliation(s)
- Ming-Jen Hsu
- Graduate Institute of Medical Sciences, Department of Pharmacology, College of Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan
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Hsu MJ, Sheu JR, Lin CH, Shen MY, Hsu CY. Mitochondrial mechanisms in amyloid beta peptide-induced cerebrovascular degeneration. Biochim Biophys Acta Gen Subj 2010; 1800:290-6. [DOI: 10.1016/j.bbagen.2009.08.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 08/06/2009] [Accepted: 08/11/2009] [Indexed: 01/19/2023]
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Yoon EJ, Park HJ, Kim GY, Cho HM, Choi JH, Park HY, Jang JY, Rhim HS, Kang SM. Intracellular amyloid beta interacts with SOD1 and impairs the enzymatic activity of SOD1: implications for the pathogenesis of amyotrophic lateral sclerosis. Exp Mol Med 2010; 41:611-7. [PMID: 19478559 DOI: 10.3858/emm.2009.41.9.067] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease caused by the degeneration of motor neurons. Mutations in Cu/Zn superoxide dismutase (SOD1), including G93A, were reportedly linked to familial ALS. SOD1 is a key antioxidant enzyme, and is also one of the major targets for oxidative damage in the brains of patients suffering from Alzheimers disease (AD). Several lines of evidence suggest that intracellular amyloid beta (Abeta) is associated with the pathogenesis of AD. In this report we demonstrate that intracellular Abeta directly interacts with SOD1, and that this interaction decreases the enzymatic activity of the enzyme. We observed Abeta-SOD1 aggregates in the perinuclear region of H4 cells, and mapped the SOD1 binding region to Abeta amino acids 26-42. Interestingly, intracellular Ab binds to the SOD1 G93A mutant with greater affinity than to wild-type SOD1. This resulted in considerably less mutant enzymatic activity. Our study implicates a potential role for Abeta in the development of ALS by interacting with the SOD1 G93A mutant.
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Affiliation(s)
- Eun Jin Yoon
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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Yin KJ, Deng Z, Huang H, Hamblin M, Xie C, Zhang J, Chen YE. miR-497 regulates neuronal death in mouse brain after transient focal cerebral ischemia. Neurobiol Dis 2010; 38:17-26. [PMID: 20053374 DOI: 10.1016/j.nbd.2009.12.021] [Citation(s) in RCA: 246] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2009] [Revised: 12/09/2009] [Accepted: 12/26/2009] [Indexed: 01/07/2023] Open
Abstract
Dysfunction of the microRNA (miR) network has been emerging as a major regulator in neurological diseases. However, little is known about the functional significance of unique miRs in ischemic brain damage. Here, we found that miR-497 is induced in mouse brain after transient middle cerebral artery occlusion (MCAO) and mouse N2A neuroblastoma (N2A) cells after oxygen-glucose deprivation (OGD). Loss-of-miR-497 function significantly suppresses OGD-induced N2A cell death, whereas gain-of-miR-497 function aggravates OGD-induced neuronal loss. Moreover, miR-497 directly binds to the predicted 3'-UTR target sites of bcl-2/-w genes. Furthermore, knockdown of cerebral miR-497 effectively enhances bcl-2/-w protein levels in the ischemic region, attenuates ischemic brain infarction, and improves neurological outcomes in mice after focal cerebral ischemia. Taken together, our data suggest that miR-497 promotes ischemic neuronal death by negatively regulating antiapoptotic proteins, bcl-2 and bcl-w. We raise the possibility that this pathway may contribute to the pathogenesis of the ischemic brain injury in stroke.
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Affiliation(s)
- Ke-Jie Yin
- Cardiovascular Center, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI 48109, USA
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Takuma K, Kataoka S, Ago Y, Matsuda T. [Mitochondrial dysfunction and neuronal apoptosis: new molecular approach to prevent Alzheimer's disease]. Nihon Yakurigaku Zasshi 2009; 134:180-3. [PMID: 19828920 DOI: 10.1254/fpj.134.180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ray B, Lahiri DK. Neuroinflammation in Alzheimer's disease: different molecular targets and potential therapeutic agents including curcumin. Curr Opin Pharmacol 2009; 9:434-44. [DOI: 10.1016/j.coph.2009.06.012] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2009] [Revised: 06/10/2009] [Accepted: 06/12/2009] [Indexed: 12/30/2022]
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Kim CY, Lee C, Park GH, Jang JH. Neuroprotective effect of epigallocatechin-3-gallate against β-amyloid-induced oxidative and nitrosative cell death via augmentation of antioxidant defense capacity. Arch Pharm Res 2009; 32:869-81. [DOI: 10.1007/s12272-009-1609-z] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2009] [Revised: 03/30/2009] [Accepted: 04/01/2009] [Indexed: 12/14/2022]
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Kuo CT, Chen BC, Yu CC, Weng CM, Hsu MJ, Chen CC, Chen MC, Teng CM, Pan SL, Bien MY, Shih CH, Lin CH. Apoptosis signal-regulating kinase 1 mediates denbinobin-induced apoptosis in human lung adenocarcinoma cells. J Biomed Sci 2009; 16:43. [PMID: 19405983 PMCID: PMC2686692 DOI: 10.1186/1423-0127-16-43] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Accepted: 05/01/2009] [Indexed: 11/30/2022] Open
Abstract
In the present study, we explore the role of apoptosis signal-regulating kinase 1 (ASK1) in denbinobin-induced apoptosis in human lung adenocarcinoma (A549) cells. Denbinobin-induced cell apoptosis was attenuated by an ASK1 dominant-negative mutant (ASK1DN), two antioxidants (N-acetyl-L-cysteine (NAC) and glutathione (GSH)), a c-Jun N-terminal kinase (JNK) inhibitor (SP600125), and an activator protein-1 (AP-1) inhibitor (curcumin). Treatment of A549 cells with denbinobin caused increases in ASK1 activity and reactive oxygen species (ROS) production, and these effects were inhibited by NAC and GSH. Stimulation of A549 cells with denbinobin caused JNK activation; this effect was markedly inhibited by NAC, GSH, and ASK1DN. Denbinobin induced c-Jun phosphorylation, the formation of an AP-1-specific DNA-protein complex, and Bim expression. Bim knockdown using a bim short interfering RNA strategy also reduced denbinobin-induced A549 cell apoptosis. The denbinobin-mediated increases in c-Jun phosphorylation and Bim expression were inhibited by NAC, GSH, SP600125, ASK1DN, JNK1DN, and JNK2DN. These results suggest that denbinobin might activate ASK1 through ROS production to cause JNK/AP-1 activation, which in turn induces Bim expression, and ultimately results in A549 cell apoptosis.
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Affiliation(s)
- Chen-Tzu Kuo
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan, ROC.
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Involvement of JNK regulation in oxidative stress-mediated murine liver injury by microcystin-LR. Apoptosis 2008; 13:1031-42. [DOI: 10.1007/s10495-008-0237-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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50
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Guo S, Kim WJ, Lok J, Lee SR, Besancon E, Luo BH, Stins MF, Wang X, Dedhar S, Lo EH. Neuroprotection via matrix-trophic coupling between cerebral endothelial cells and neurons. Proc Natl Acad Sci U S A 2008; 105:7582-7. [PMID: 18495934 PMCID: PMC2396701 DOI: 10.1073/pnas.0801105105] [Citation(s) in RCA: 199] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The neurovascular unit is an emerging concept that emphasizes homeostatic interactions between endothelium and cerebral parenchyma. Here, we show that cerebral endothelium are not just inert tubes for delivering blood, but they also secrete trophic factors that can be directly neuroprotective. Conditioned media from cerebral endothelial cells broadly protects neurons against oxygen-glucose deprivation, oxidative damage, endoplasmic reticulum stress, hypoxia, and amyloid neurotoxicity. This phenomenon is largely mediated by endothelial-produced brain-derived neurotrophic factor (BDNF) because filtering endothelial-conditioned media with TrkB-Fc eliminates the neuroprotective effect. Endothelial production of BDNF is sustained by beta-1 integrin and integrin-linked kinase (ILK) signaling. Noncytotoxic levels of oxidative stress disrupts ILK signaling and reduces endothelial levels of neuroprotective BDNF. These data suggest that cerebral endothelium provides a critical source of homeostatic support for neurons. Targeting these signals of matrix and trophic coupling between endothelium and neurons may provide new therapeutic opportunities for stroke and other CNS disorders.
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Affiliation(s)
- Shuzhen Guo
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
| | - Woo Jean Kim
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
| | - Josephine Lok
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
| | - Sun-Ryung Lee
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
- †Department of Biology, Cheju National University, Jeju City 690-756, Korea;
| | - Elaine Besancon
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
| | - Bing-Hao Luo
- ‡Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803;
| | - Monique F. Stins
- §Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205; and
| | - Xiaoying Wang
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
| | - Shoukat Dedhar
- ¶Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC, Canada V6T 1Z4
| | - Eng H. Lo
- *Neuroprotection Research Laboratory, Departments of Neurology and Radiology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129;
- ‖To whom correspondence should be addressed. E-mail:
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