1
|
Mirzahosseini G, Adam JM, Nasoohi S, El-Remessy AB, Ishrat T. Lost in Translation: Neurotrophins Biology and Function in the Neurovascular Unit. Neuroscientist 2023; 29:694-714. [PMID: 35769016 DOI: 10.1177/10738584221104982] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The neurovascular unit (NVU) refers to the functional building unit of the brain and the retina, where neurons, glia, and microvasculature orchestrate to meet the demand of the retina's and brain's function. Neurotrophins (NTs) are structural families of secreted proteins and are known for exerting neurotrophic effects on neuronal differentiation, survival, neurite outgrowth, synaptic formation, and plasticity. NTs include several molecules, such as nerve growth factor, brain-derived neurotrophic factor, NT-3, NT-4, and their precursors. Furthermore, NTs are involved in signaling pathways such as inflammation, apoptosis, and angiogenesis in a nonneuronal cell type. Interestingly, NTs and the precursors can bind and activate the p75 neurotrophin receptor (p75NTR) at low and high affinity. Mature NTs bind their cognate tropomyosin/tyrosine-regulated kinase receptors, crucial for maintenance and neuronal development in the brain and retina axis. Activation of p75NTR results in neuronal apoptosis and cell death, while tropomysin receptor kinase upregulation contributes to differentiation and cell growth. Recent findings indicate that modulation of NTs and their receptors contribute to neurovascular dysfunction in the NVU. Several chronic metabolic and acute ischemic diseases affect the NVU, including diabetic and ischemic retinopathy for the retina, as well as stroke, acute encephalitis, and traumatic brain injury for the brain. This work aims to review the current evidence through published literature studying the impact of NTs and their receptors, including the p75NTR receptor, on the injured and healthy brain-retina axis.
Collapse
Affiliation(s)
- Golnoush Mirzahosseini
- Department of Anatomy and Neurobiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Justin Mark Adam
- Department of Medicine, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Sanaz Nasoohi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Tauheed Ishrat
- Department of Anatomy and Neurobiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
- Neuroscience Institute, University of Tennessee Health Science Center, Memphis, TN, USA
| |
Collapse
|
2
|
Abstract
Post-translational modification with O-linked β-N-acetylglucosamine (O-GlcNAc), a process referred to as O-GlcNAcylation, occurs on a vast variety of proteins. Mounting evidence in the past several decades has clearly demonstrated that O-GlcNAcylation is a unique and ubiquitous modification. Reminiscent of a code, protein O-GlcNAcylation functions as a crucial regulator of nearly all cellular processes studied. The primary aim of this review is to summarize the developments in our understanding of myriad protein substrates modified by O-GlcNAcylation from a systems perspective. Specifically, we provide a comprehensive survey of O-GlcNAcylation in multiple species studied, including eukaryotes (e.g., protists, fungi, plants, Caenorhabditis elegans, Drosophila melanogaster, murine, and human), prokaryotes, and some viruses. We evaluate features (e.g., structural properties and sequence motifs) of O-GlcNAc modification on proteins across species. Given that O-GlcNAcylation functions in a species-, tissue-/cell-, protein-, and site-specific manner, we discuss the functional roles of O-GlcNAcylation on human proteins. We focus particularly on several classes of relatively well-characterized human proteins (including transcription factors, protein kinases, protein phosphatases, and E3 ubiquitin-ligases), with representative O-GlcNAc site-specific functions presented. We hope the systems view of the great endeavor in the past 35 years will help demystify the O-GlcNAc code and lead to more fascinating studies in the years to come.
Collapse
Affiliation(s)
- Junfeng Ma
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Georgetown University, Washington, DC 20057, United States
| | - Chunyan Hou
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Georgetown University, Washington, DC 20057, United States
| | - Ci Wu
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Georgetown University, Washington, DC 20057, United States
| |
Collapse
|
3
|
Sankorrakul K, Qian L, Thangnipon W, Coulson EJ. Is there a role for the p75 neurotrophin receptor in mediating degeneration during oxidative stress and after hypoxia? J Neurochem 2021; 158:1292-1306. [PMID: 34109634 DOI: 10.1111/jnc.15451] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 06/01/2021] [Accepted: 06/04/2021] [Indexed: 12/21/2022]
Abstract
Cholinergic basal forebrain (cBF) neurons are particularly vulnerable to degeneration following trauma and in neurodegenerative conditions. One reason for this is their characteristic expression of the p75 neurotrophin receptor (p75NTR ), which is up-regulated and mediates neuronal death in a range of neurological and neurodegenerative conditions, including dementia, stroke and ischaemia. The signalling pathway by which p75NTR signals cell death is incompletely characterised, but typically involves activation by neurotrophic ligands and signalling through c-Jun kinase, resulting in caspase activation via mitochondrial apoptotic signalling pathways. Less well appreciated is the link between conditions of oxidative stress and p75NTR death signalling. Here, we review the literature describing what is currently known regarding p75NTR death signalling in environments of oxidative stress and hypoxia to highlight the overlap in signalling pathways and the implications for p75NTR signalling in cBF neurons. We propose that there is a causal relationship and define key questions to test this assertion.
Collapse
Affiliation(s)
- Kornraviya Sankorrakul
- School of Biomedical Sciences, Faculty of Medicine and Queensland Brain Institute, Clem Jones Centre for Ageing Dementia Research, The University of Queensland, Brisbane, Qld., Australia.,Research Center for Neuroscience, Institute of Molecular Biosciences, Mahidol University, Salaya, Thailand
| | - Lei Qian
- School of Biomedical Sciences, Faculty of Medicine and Queensland Brain Institute, Clem Jones Centre for Ageing Dementia Research, The University of Queensland, Brisbane, Qld., Australia
| | - Wipawan Thangnipon
- Research Center for Neuroscience, Institute of Molecular Biosciences, Mahidol University, Salaya, Thailand
| | - Elizabeth J Coulson
- School of Biomedical Sciences, Faculty of Medicine and Queensland Brain Institute, Clem Jones Centre for Ageing Dementia Research, The University of Queensland, Brisbane, Qld., Australia
| |
Collapse
|
4
|
O-GlcNAc modification mediates aquaporin 3 to coordinate endometrial cell glycolysis and affects embryo implantation. J Adv Res 2021; 37:119-131. [PMID: 35499042 PMCID: PMC9039670 DOI: 10.1016/j.jare.2021.06.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 06/28/2021] [Accepted: 06/28/2021] [Indexed: 11/23/2022] Open
Abstract
O-GlcNAcylation affects endometrial cell physiological changes and implantation O-GlcNAcylation causes glucose metabolism to be redirected to PPP and HBP O-GlcNAcylation-mediated AQP3 provides compensation for glycolysis O-GlcNAcylation of Sp1 promotes the expression of AQP3 OO-GlcNAcylation of Sp1 affects its stability
Introduction Objectives Methods Results Conclusion
Collapse
|
5
|
Tan W, Jiang P, Zhang W, Hu Z, Lin S, Chen L, Li Y, Peng C, Li Z, Sun A, Chen Y, Zhu W, Xue Y, Yao Y, Li X, Song Q, He F, Qin W, Pei H. Posttranscriptional regulation of de novo lipogenesis by glucose-induced O-GlcNAcylation. Mol Cell 2021; 81:1890-1904.e7. [PMID: 33657401 DOI: 10.1016/j.molcel.2021.02.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 12/21/2020] [Accepted: 02/03/2021] [Indexed: 02/07/2023]
Abstract
O-linked β-N-acetyl glucosamine (O-GlcNAc) is attached to proteins under glucose-replete conditions; this posttranslational modification results in molecular and physiological changes that affect cell fate. Here we show that posttranslational modification of serine/arginine-rich protein kinase 2 (SRPK2) by O-GlcNAc regulates de novo lipogenesis by regulating pre-mRNA splicing. We found that O-GlcNAc transferase O-GlcNAcylated SRPK2 at a nuclear localization signal (NLS), which triggers binding of SRPK2 to importin α. Consequently, O-GlcNAcylated SRPK2 was imported into the nucleus, where it phosphorylated serine/arginine-rich proteins and promoted splicing of lipogenic pre-mRNAs. We determined that protein nuclear import by O-GlcNAcylation-dependent binding of cargo protein to importin α might be a general mechanism in cells. This work reveals a role of O-GlcNAc in posttranscriptional regulation of de novo lipogenesis, and our findings indicate that importin α is a "reader" of an O-GlcNAcylated NLS.
Collapse
Affiliation(s)
- Wei Tan
- Department of Biochemistry and Molecular Medicine, The George Washington University School of Medicine and Health Science, 2300 Eye Street, N.W., Washington, DC 20037, USA
| | - Pei Jiang
- State Key Laboratory of Proteomics, National Center for Protein Sciences - Beijing, Beijing Proteome Research Center, Beijing Institute of Lifeomics, Beijing 102206, China; Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China
| | - Wanjun Zhang
- State Key Laboratory of Proteomics, National Center for Protein Sciences - Beijing, Beijing Proteome Research Center, Beijing Institute of Lifeomics, Beijing 102206, China
| | - Zhaohua Hu
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China
| | - Shaofeng Lin
- Key Laboratory of Molecular Biophysics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, Center for Artificial Intelligence Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Lulu Chen
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China; GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC 20052, USA
| | - Yingge Li
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China; GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC 20052, USA
| | - Changmin Peng
- Department of Biochemistry and Molecular Medicine, The George Washington University School of Medicine and Health Science, 2300 Eye Street, N.W., Washington, DC 20037, USA; GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC 20052, USA
| | - Zhuqing Li
- Department of Biochemistry and Molecular Medicine, The George Washington University School of Medicine and Health Science, 2300 Eye Street, N.W., Washington, DC 20037, USA; GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC 20052, USA
| | - Aihua Sun
- State Key Laboratory of Proteomics, National Center for Protein Sciences - Beijing, Beijing Proteome Research Center, Beijing Institute of Lifeomics, Beijing 102206, China
| | - Yali Chen
- State Key Laboratory of Proteomics, National Center for Protein Sciences - Beijing, Beijing Proteome Research Center, Beijing Institute of Lifeomics, Beijing 102206, China
| | - Wenge Zhu
- Department of Biochemistry and Molecular Medicine, The George Washington University School of Medicine and Health Science, 2300 Eye Street, N.W., Washington, DC 20037, USA; GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC 20052, USA
| | - Yu Xue
- Key Laboratory of Molecular Biophysics of Ministry of Education, Hubei Bioinformatics and Molecular Imaging Key Laboratory, Center for Artificial Intelligence Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Yi Yao
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China
| | - Xiangpan Li
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China
| | - Qibin Song
- Cancer Center, Renmin Hospital of Wuhan University, Wuhan 430062, China
| | - Fuchu He
- State Key Laboratory of Proteomics, National Center for Protein Sciences - Beijing, Beijing Proteome Research Center, Beijing Institute of Lifeomics, Beijing 102206, China.
| | - Weijie Qin
- State Key Laboratory of Proteomics, National Center for Protein Sciences - Beijing, Beijing Proteome Research Center, Beijing Institute of Lifeomics, Beijing 102206, China.
| | - Huadong Pei
- Department of Biochemistry and Molecular Medicine, The George Washington University School of Medicine and Health Science, 2300 Eye Street, N.W., Washington, DC 20037, USA; GW Cancer Center, George Washington University School of Medicine and Health Sciences, Washington, DC 20052, USA.
| |
Collapse
|
6
|
Costa R, Remigante A, Civello DA, Bernardinelli E, Szabó Z, Morabito R, Marino A, Sarikas A, Patsch W, Paulmichl M, Janáky T, Miseta A, Nagy T, Dossena S. O-GlcNAcylation Suppresses the Ion Current IClswell by Preventing the Binding of the Protein ICln to α-Integrin. Front Cell Dev Biol 2020; 8:607080. [PMID: 33330510 PMCID: PMC7717961 DOI: 10.3389/fcell.2020.607080] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 10/23/2020] [Indexed: 12/30/2022] Open
Abstract
O-GlcNAcylation is a post-translational modification of proteins that controls a variety of cellular processes, is chronically elevated in diabetes mellitus, and may contribute to the progression of diabetic complications, including diabetic nephropathy. Our previous work showed that increases in the O-GlcNAcylation of cellular proteins impair the homeostatic reaction of the regulatory volume decrease (RVD) after cell swelling by an unknown mechanism. The activation of the swelling-induced chloride current IClswell is a key step in RVD, and ICln, a ubiquitous protein involved in the activation of IClswell, is O-GlcNAcylated. Here, we show that experimentally increased O-GlcNAcylation of cellular proteins inhibited the endogenous as well as the ICln-induced IClswell current and prevented RVD in a human renal cell line, while decreases in O-GlcNAcylation augmented the current magnitude. In parallel, increases or decreases in O-GlcNAcylation, respectively, weakened or stabilized the binding of ICln to the intracellular domain of α-integrin, a process that is essential for the activation of IClswell. Mutation of the putative YinOYang site at Ser67 rendered the ICln-induced IClswell current unresponsive to O-GlcNAc variations, and the ICln interaction with α-integrin insensitive to O-GlcNAcylation. In addition, exposure of cells to a hypotonic solution reduced the O-GlcNAcylation of cellular proteins. Together, these findings show that O-GlcNAcylation affects RVD by influencing IClswell and further indicate that hypotonicity may activate IClswell by reducing the O-GlcNAcylation of ICln at Ser67, therefore permitting its binding to α-integrin. We propose that disturbances in the regulation of cellular volume may contribute to disease in settings of chronically elevated O-GlcNAcylation, including diabetic nephropathy.
Collapse
Affiliation(s)
- Roberta Costa
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria
| | - Alessia Remigante
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria.,Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Davide A Civello
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria
| | - Emanuele Bernardinelli
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria
| | - Zoltán Szabó
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Rossana Morabito
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Angela Marino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Antonio Sarikas
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria
| | - Wolfgang Patsch
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria
| | - Markus Paulmichl
- Department of Personalized Medicine, Humanomed, Klagenfurt, Austria
| | - Tamás Janáky
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Attila Miseta
- Department of Laboratory Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Tamás Nagy
- Department of Laboratory Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Silvia Dossena
- Institute of Pharmacology and Toxicology, Paracelsus Medical University, Salzburg, Austria
| |
Collapse
|
7
|
Chatham JC, Zhang J, Wende AR. Role of O-Linked N-Acetylglucosamine Protein Modification in Cellular (Patho)Physiology. Physiol Rev 2020; 101:427-493. [PMID: 32730113 DOI: 10.1152/physrev.00043.2019] [Citation(s) in RCA: 146] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In the mid-1980s, the identification of serine and threonine residues on nuclear and cytoplasmic proteins modified by a N-acetylglucosamine moiety (O-GlcNAc) via an O-linkage overturned the widely held assumption that glycosylation only occurred in the endoplasmic reticulum, Golgi apparatus, and secretory pathways. In contrast to traditional glycosylation, the O-GlcNAc modification does not lead to complex, branched glycan structures and is rapidly cycled on and off proteins by O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA), respectively. Since its discovery, O-GlcNAcylation has been shown to contribute to numerous cellular functions, including signaling, protein localization and stability, transcription, chromatin remodeling, mitochondrial function, and cell survival. Dysregulation in O-GlcNAc cycling has been implicated in the progression of a wide range of diseases, such as diabetes, diabetic complications, cancer, cardiovascular, and neurodegenerative diseases. This review will outline our current understanding of the processes involved in regulating O-GlcNAc turnover, the role of O-GlcNAcylation in regulating cellular physiology, and how dysregulation in O-GlcNAc cycling contributes to pathophysiological processes.
Collapse
Affiliation(s)
- John C Chatham
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| | - Jianhua Zhang
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| | - Adam R Wende
- Division of Molecular and Cellular Pathology, Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama; and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama
| |
Collapse
|
8
|
Stress-induced O-GlcNAcylation: an adaptive process of injured cells. Biochem Soc Trans 2017; 45:237-249. [PMID: 28202678 DOI: 10.1042/bst20160153] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 11/30/2016] [Accepted: 12/14/2016] [Indexed: 02/07/2023]
Abstract
In the 30 years, since the discovery of nucleocytoplasmic glycosylation, O-GlcNAc has been implicated in regulating cellular processes as diverse as protein folding, localization, degradation, activity, post-translational modifications, and interactions. The cell co-ordinates these molecular events, on thousands of cellular proteins, in concert with environmental and physiological cues to fine-tune epigenetics, transcription, translation, signal transduction, cell cycle, and metabolism. The cellular stress response is no exception: diverse forms of injury result in dynamic changes to the O-GlcNAc subproteome that promote survival. In this review, we discuss the biosynthesis of O-GlcNAc, the mechanisms by which O-GlcNAc promotes cytoprotection, and the clinical significance of these data.
Collapse
|
9
|
GFAT1 phosphorylation by AMPK promotes VEGF-induced angiogenesis. Biochem J 2017; 474:983-1001. [PMID: 28008135 DOI: 10.1042/bcj20160980] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 12/20/2016] [Accepted: 12/22/2016] [Indexed: 02/07/2023]
Abstract
Activation of AMP-activated protein kinase (AMPK) in endothelial cells regulates energy homeostasis, stress protection and angiogenesis, but the underlying mechanisms are incompletely understood. Using a label-free phosphoproteomic analysis, we identified glutamine:fructose-6-phosphate amidotransferase 1 (GFAT1) as an AMPK substrate. GFAT1 is the rate-limiting enzyme in the hexosamine biosynthesis pathway (HBP) and as such controls the modification of proteins by O-linked β-N-acetylglucosamine (O-GlcNAc). In the present study, we tested the hypothesis that AMPK controls O-GlcNAc levels and function of endothelial cells via GFAT1 phosphorylation using biochemical, pharmacological, genetic and in vitro angiogenesis approaches. Activation of AMPK in primary human endothelial cells by 5-aminoimidazole-4-carboxamide riboside (AICAR) or by vascular endothelial growth factor (VEGF) led to GFAT1 phosphorylation at serine 243. This effect was not seen when AMPK was down-regulated by siRNA. Upon AMPK activation, diminished GFAT activity and reduced O-GlcNAc levels were observed in endothelial cells containing wild-type (WT)-GFAT1 but not in cells expressing non-phosphorylatable S243A-GFAT1. Pharmacological inhibition or siRNA-mediated down-regulation of GFAT1 potentiated VEGF-induced sprouting, indicating that GFAT1 acts as a negative regulator of angiogenesis. In cells expressing S243A-GFAT1, VEGF-induced sprouting was reduced, suggesting that VEGF relieves the inhibitory action of GFAT1/HBP on angiogenesis via AMPK-mediated GFAT1 phosphorylation. Activation of GFAT1/HBP by high glucose led to impairment of vascular sprouting, whereas GFAT1 inhibition improved sprouting even if glucose level was high. Our findings provide novel mechanistic insights into the role of HBP in angiogenesis. They suggest that targeting AMPK in endothelium might help to ameliorate hyperglycaemia-induced vascular dysfunction associated with metabolic disorders.
Collapse
|
10
|
Kátai E, Pál J, Poór VS, Purewal R, Miseta A, Nagy T. Oxidative stress induces transient O-GlcNAc elevation and tau dephosphorylation in SH-SY5Y cells. J Cell Mol Med 2016; 20:2269-2277. [PMID: 27456536 PMCID: PMC5134385 DOI: 10.1111/jcmm.12910] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 05/19/2016] [Indexed: 12/27/2022] Open
Abstract
O-linked β-N-acetlyglucosamine or O-GlcNAc modification is a dynamic post-translational modification occurring on the Ser/Thr residues of many intracellular proteins. The chronic imbalance between phosphorylation and O-GlcNAc on tau protein is considered as one of the main hallmarks of Alzheimer's disease. In recent years, many studies also showed that O-GlcNAc levels can elevate upon acute stress and suggested that this might facilitate cell survival. However, many consider chronic stress, including oxidative damage as a major risk factor in the development of the disease. In this study, using the neuronal cell line SH-SY5Y we investigated the dynamic nature of O-GlcNAc after treatment with 0.5 mM H2 O2 for 30 min. to induce oxidative stress. We found that overall O-GlcNAc quickly increased and reached peak level at around 2 hrs post-stress, then returned to baseline levels after about 24 hrs. Interestingly, we also found that tau protein phosphorylation at site S262 showed parallel, whereas at S199 and PHF1 sites showed inverse dynamic to O-Glycosylation. In conclusion, our results show that temporary elevation in O-GlcNAc modification after H2 O2 -induced oxidative stress is detectable in cells of neuronal origin. Furthermore, oxidative stress changes the dynamic balance between O-GlcNAc and phosphorylation on tau proteins.
Collapse
Affiliation(s)
- Emese Kátai
- Department of Laboratory MedicineUniversity of PécsPécsHungary
| | - József Pál
- Department of NeurosurgeryUniversity of PécsPécsHungary
- Neuronal Networks GroupCollege of Medical and Dental SciencesUniversity of BirminghamBirminghamUK
| | | | - Rupeena Purewal
- Department of PediatricsWest Virginia UniversityMorgantownWVUSA
| | - Attila Miseta
- Department of Laboratory MedicineUniversity of PécsPécsHungary
| | - Tamás Nagy
- Department of Laboratory MedicineUniversity of PécsPécsHungary
- János Szentágothai Research CentreUniversity of PécsPécsHungary
| |
Collapse
|
11
|
Lee A, Miller D, Henry R, Paruchuri VDP, O'Meally RN, Boronina T, Cole RN, Zachara NE. Combined Antibody/Lectin Enrichment Identifies Extensive Changes in the O-GlcNAc Sub-proteome upon Oxidative Stress. J Proteome Res 2016; 15:4318-4336. [PMID: 27669760 DOI: 10.1021/acs.jproteome.6b00369] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
O-Linked N-acetyl-β-d-glucosamine (O-GlcNAc) is a dynamic post-translational modification that modifies and regulates over 3000 nuclear, cytoplasmic, and mitochondrial proteins. Upon exposure to stress and injury, cells and tissues increase the O-GlcNAc modification, or O-GlcNAcylation, of numerous proteins promoting the cellular stress response and thus survival. The aim of this study was to identify proteins that are differentially O-GlcNAcylated upon acute oxidative stress (H2O2) to provide insight into the mechanisms by which O-GlcNAc promotes survival. We achieved this goal by employing Stable Isotope Labeling of Amino Acids in Cell Culture (SILAC) and a novel "G5-lectibody" immunoprecipitation strategy that combines four O-GlcNAc-specific antibodies (CTD110.6, RL2, HGAC39, and HGAC85) and the lectin WGA. Using the G5-lectibody column in combination with basic reversed phase chromatography and C18 RPLC-MS/MS, 990 proteins were identified and quantified. Hundreds of proteins that were identified demonstrated increased (>250) or decreased (>110) association with the G5-lectibody column upon oxidative stress, of which we validated the O-GlcNAcylation status of 24 proteins. Analysis of proteins with altered glycosylation suggests that stress-induced changes in O-GlcNAcylation cluster into pathways known to regulate the cell's response to injury and include protein folding, transcriptional regulation, epigenetics, and proteins involved in RNA biogenesis. Together, these data suggest that stress-induced O-GlcNAcylation regulates numerous and diverse cellular pathways to promote cell and tissue survival.
Collapse
Affiliation(s)
- Albert Lee
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Devin Miller
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Roger Henry
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Venkata D P Paruchuri
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| | - Robert N O'Meally
- Mass Spectrometry and Proteomics Facility, The Johns Hopkins University School of Medicine , 733 North Broadway Street, Baltimore, Maryland 21205-2185, United States
| | - Tatiana Boronina
- Mass Spectrometry and Proteomics Facility, The Johns Hopkins University School of Medicine , 733 North Broadway Street, Baltimore, Maryland 21205-2185, United States
| | - Robert N Cole
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States.,Mass Spectrometry and Proteomics Facility, The Johns Hopkins University School of Medicine , 733 North Broadway Street, Baltimore, Maryland 21205-2185, United States
| | - Natasha E Zachara
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine , 725 North Wolfe Street, Baltimore, Maryland 21205-2185, United States
| |
Collapse
|
12
|
Chakravarthy R, Mnich K, Gorman AM. Nerve growth factor (NGF)-mediated regulation of p75(NTR) expression contributes to chemotherapeutic resistance in triple negative breast cancer cells. Biochem Biophys Res Commun 2016; 478:1541-7. [PMID: 27577679 DOI: 10.1016/j.bbrc.2016.08.149] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 08/26/2016] [Indexed: 01/09/2023]
Abstract
Triple negative breast cancer [TNBC] cells are reported to secrete the neurotrophin nerve growth factor [NGF] and express its receptors, p75 neurotrophin receptor [p75(NTR)] and TrkA, leading to NGF-activated pro-survival autocrine signaling. This provides a rationale for NGF as a potential therapeutic target for TNBC. Here we show that exposure of TNBC cells to NGF leads to increased levels of p75(NTR), which was diminished by NGF-neutralizing antibody or NGF inhibitors [Ro 08-2750 and Y1086]. NGF-mediated increase in p75(NTR) levels were partly due to increased transcription and partly due to inhibition of proteolytic processing of p75(NTR). In contrast, proNGF caused a decrease in p75(NTR) levels. Functionally, NGF-induced increase in p75(NTR) caused a decrease in the sensitivity of TNBC cells to apoptosis induction. In contrast, knock-down of p75(NTR) using shRNA or small molecule inhibition of NGF-p75(NTR) interaction [using Ro 08-2750] sensitized TNBC cells to drug-induced apoptosis. In patient samples, the expression of NGF and NGFR [the p75(NTR) gene] mRNA are positively correlated in several subtypes of breast cancer, including basal-like breast cancer. Together these data suggest a positive feedback loop through which NGF-mediated upregulation of p75(NTR) can contribute to the chemo-resistance of TNBC cells.
Collapse
|
13
|
Brito V, Giralt A, Enriquez-Barreto L, Puigdellívol M, Suelves N, Zamora-Moratalla A, Ballesteros JJ, Martín ED, Dominguez-Iturza N, Morales M, Alberch J, Ginés S. Neurotrophin receptor p75(NTR) mediates Huntington's disease-associated synaptic and memory dysfunction. J Clin Invest 2014; 124:4411-28. [PMID: 25180603 PMCID: PMC4191006 DOI: 10.1172/jci74809] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 07/29/2014] [Indexed: 12/13/2022] Open
Abstract
Learning and memory deficits are early clinical manifestations of Huntington's disease (HD). These cognitive impairments have been mainly associated with frontostriatal HD pathology; however, compelling evidence provided by several HD murine models suggests that the hippocampus may contribute to synaptic deficits and memory dysfunction in HD. The neurotrophin receptor p75(NTR) negatively regulates spine density, which is associated with learning and memory; therefore, we explored whether disturbed p75(NTR) function in the hippocampus could contribute to synaptic dysfunction and memory deficits in HD. Here, we determined that levels of p75(NTR) are markedly increased in the hippocampus of 2 distinct mouse models of HD and in HD patients. Normalization of p75(NTR) levels in HD mutant mice heterozygous for p75(NTR) prevented memory and synaptic plasticity deficits and ameliorated dendritic spine abnormalities, likely through normalization of the activity of the GTPase RhoA. Moreover, viral-mediated overexpression of p75(NTR) in the hippocampus of WT mice reproduced HD learning and memory deficits, while knockdown of p75(NTR) in the hippocampus of HD mice prevented cognitive decline. Together, these findings provide evidence of hippocampus-associated memory deficits in HD and demonstrate that p75(NTR) mediates synaptic, learning, and memory dysfunction in HD.
Collapse
Affiliation(s)
- Verónica Brito
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Albert Giralt
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Lilian Enriquez-Barreto
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Mar Puigdellívol
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Nuria Suelves
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Alfonsa Zamora-Moratalla
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Jesús J. Ballesteros
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Eduardo D. Martín
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Nuria Dominguez-Iturza
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Miguel Morales
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Jordi Alberch
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| | - Sílvia Ginés
- Departament de Biologia Celηlular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain. Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain. Structural Synaptic Plasticity Lab, Department of Neurodegenerative Diseases, Centro de Investigación Biomédica de la Rioja, La Rioja, Spain. Laboratory of Neurophysiology and Synaptic Plasticity, Albacete Science and Technology Park (PCyTA), Institute for Research in Neurological Disabilities (IDINE), University of Castilla-La Mancha, Albacete, Spain
| |
Collapse
|
14
|
Sohn KC, Lee EJ, Shin JM, Lim EH, No Y, Lee JY, Yoon TY, Lee YH, Im M, Lee Y, Seo YJ, Lee JH, Kim CD. Regulation of keratinocyte differentiation by O-GlcNAcylation. J Dermatol Sci 2014; 75:10-5. [PMID: 24802710 DOI: 10.1016/j.jdermsci.2014.04.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 04/04/2014] [Accepted: 04/21/2014] [Indexed: 10/25/2022]
Abstract
BACKGROUND O-linked β-N-acetylglucosamine (O-GlcNAc) modification is one of the posttranslational modification, emerging as an important regulatory mechanism in various cellular events. OBJECTIVE We attempted to investigate whether O-GlcNAcylation is involved in keratinocyte differentiation. METHODS Immunohistochemistry and Western blot were performed to demonstrate O-GlcNAcylation in keratinocyte differentiation. RESULTS During calcium-induced keratinocyte differentiation, overall O-GlcNAcylation was decreased in a temporal manner. We focused our attention on transcription factor Sp-1, which is implicated in keratinocyte differentiation. Total Sp-1 level did not change during keratinocyte differentiation. However, O-GlcNAcylated Sp-1 was decreased in a keratinocyte differentiation-dependent manner. Interestingly, transcriptional activity of Sp-1, in terms of involucrin and loricrin promoter activities, was markedly increased by overexpression of O-GlcNAcase (OGA). In addition, membrane permeable non-O-GlcNAcylated Sp-1 did show transcriptional activity, while membrane permeable O-GlcNAcylated Sp-1 did not, suggesting O-GlcNAcylated Sp-1 is an inactive form in keratinocyte differentiation. CONCLUSION Our results reveal that O-GlcNAcylation is a dynamic regulatory mechanism for keratinocyte differentiation.
Collapse
Affiliation(s)
- Kyung-Cheol Sohn
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Eun Jin Lee
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Jung-Min Shin
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Eun-Hwa Lim
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Yoonoo No
- Department of Dermatology, School of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, Republic of Korea
| | - Ji Yeoun Lee
- Department of Dermatology, School of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, Republic of Korea
| | - Tae Young Yoon
- Department of Dermatology, School of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, Republic of Korea
| | - Young Ho Lee
- Department of Anatomy, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Myung Im
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Young Lee
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Young-Joon Seo
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Jeung-Hoon Lee
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Chang Deok Kim
- Department of Dermatology and Research Institute for Medical Sciences, School of Medicine, Chungnam National University, Daejeon, Republic of Korea.
| |
Collapse
|
15
|
Irmady K, Jackman KA, Padow VA, Shahani N, Martin LA, Cerchietti L, Unsicker K, Iadecola C, Hempstead BL. Mir-592 regulates the induction and cell death-promoting activity of p75NTR in neuronal ischemic injury. J Neurosci 2014; 34:3419-28. [PMID: 24573298 PMCID: PMC3935094 DOI: 10.1523/jneurosci.1982-13.2014] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 01/24/2014] [Accepted: 01/29/2014] [Indexed: 11/21/2022] Open
Abstract
The neurotrophin receptor p75(NTR) has been implicated in mediating neuronal apoptosis after injury to the CNS. Despite its frequent induction in pathologic states, there is limited understanding of the mechanisms that regulate p75(NTR) expression after injury. Here, we show that after focal cerebral ischemia in vivo or oxygen-glucose deprivation in organotypic hippocampal slices or neurons, p75(NTR) is rapidly induced. A concomitant induction of proNGF, a ligand for p75(NTR), is also observed. Induction of this ligand/receptor system is pathologically relevant, as a decrease in apoptosis, after oxygen-glucose deprivation, is observed in hippocampal neurons or slices after delivery of function-blocking antibodies to p75(NTR) or proNGF and in p75(NTR) and ngf haploinsufficient slices. Furthermore, a significant decrease in infarct volume was noted in p75(NTR)-/- mice compared with the wild type. We also investigated the regulatory mechanisms that lead to post-ischemic induction of p75(NTR). We demonstrate that induction of p75(NTR) after ischemic injury is independent of transcription but requires active translation. Basal levels of p75(NTR) in neurons are maintained in part by the expression of microRNA miR-592, and an inverse correlation is seen between miR-592 and p75(NTR) levels in the adult brain. After cerebral ischemia, miR-592 levels fall, with a corresponding increase in p75(NTR) levels. Importantly, overexpression of miR-592 in neurons decreases the level of ischemic injury-induced p75(NTR) and attenuates activation of pro-apoptotic signaling and cell death. These results identify miR-592 as a key regulator of p75(NTR) expression and point to a potential therapeutic candidate to limit neuronal apoptosis after ischemic injury.
Collapse
Affiliation(s)
| | - Katherine A. Jackman
- Brain and Mind Research Institute, Weill Cornell Medical College, New York, New York 10065, and
| | | | - Neelam Shahani
- Interdisciplinary Center for Neurosciences, Department of Neuroanatomy, University of Heidelberg, INF 307, D69120 Heidelberg, Germany
| | | | | | - Klaus Unsicker
- Interdisciplinary Center for Neurosciences, Department of Neuroanatomy, University of Heidelberg, INF 307, D69120 Heidelberg, Germany
| | - Costantino Iadecola
- Brain and Mind Research Institute, Weill Cornell Medical College, New York, New York 10065, and
| | | |
Collapse
|
16
|
Kraemer BR, Yoon SO, Carter BD. The biological functions and signaling mechanisms of the p75 neurotrophin receptor. Handb Exp Pharmacol 2014; 220:121-164. [PMID: 24668472 DOI: 10.1007/978-3-642-45106-5_6] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The p75 neurotrophin receptor (p75(NTR)) regulates a wide range of cellular functions, including programmed cell death, axonal growth and degeneration, cell proliferation, myelination, and synaptic plasticity. The multiplicity of cellular functions governed by the receptor arises from the variety of ligands and co-receptors which associate with p75(NTR) and regulate its signaling. P75(NTR) promotes survival through interactions with Trk receptors, inhibits axonal regeneration via partnerships with Nogo receptor (Nogo-R) and Lingo-1, and promotes apoptosis through association with Sortilin. Signals downstream of these interactions are further modulated through regulated intramembrane proteolysis (RIP) of p75(NTR) and by interactions with numerous cytosolic partners. In this chapter, we discuss the intricate signaling mechanisms of p75(NTR), emphasizing how these signals are differentially regulated to mediate these diverse cellular functions.
Collapse
Affiliation(s)
- B R Kraemer
- Department of Biochemistry, Vanderbilt University School of Medicine, 625 Light Hall, Nashville, TN, 37232, USA
| | | | | |
Collapse
|
17
|
Imbalance of p75(NTR)/TrkB protein expression in Huntington's disease: implication for neuroprotective therapies. Cell Death Dis 2013; 4:e595. [PMID: 23598407 PMCID: PMC3641339 DOI: 10.1038/cddis.2013.116] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Neuroprotective therapies based on brain-derived neurotrophic factor (BDNF) administration have been proposed for Huntington's disease (HD) treatment. However, our group has recently reported reduced levels of TrkB in HD mouse models and HD human brain suggesting that besides a decrease on BDNF levels a reduction of TrkB expression could also contribute to diminished neurotrophic support in HD. BDNF can also bind to p75 neurotrophin receptor (p75NTR) modulating TrkB signaling. Therefore, in this study we have analyzed the levels of p75NTR in several HD models, as well as in HD human brain. Our data demonstrates a p75NTR/TrkB imbalance in the striatum of two different HD mouse models, HdhQ111/111 homozygous knockin mice and R6/1 mice that was also manifested in the putamen of HD patients. The imbalance between TrkB and p75NTR levels in a HD cellular model did not affect BDNF-mediated TrkB activation of prosurvival pathways but induced activation of apoptotic cascades as demonstrated by increased JNK phosphorylation. Moreover, BDNF failed to protect mutant huntingtin striatal cells transfected with p75NTR against NMDA-mediated excitotoxicity, which was associated with decreased Akt phosphorylation. Interestingly, lack of Akt activation following BDNF and NMDA treatment correlated with increased PP1 levels. Accordingly, pharmacological inhibition of PP1 by okadaic acid (OA) prevented mutant huntingtin striatal cell death induced by NMDA and BDNF. Altogether, our findings demonstrate that the p75NTR/TrkB imbalance induced by mutant huntingtin in striatal cells associated with the aberrant activity of PP1 disturbs BDNF neuroprotection likely contributing to increasing striatal vulnerability in HD. On the basis of this data we hypothesize that normalization of p75NTR and/or TrkB expression or their signaling will improve BDNF neuroprotective therapies in HD.
Collapse
|
18
|
Villarreal A, Aviles Reyes RX, Angelo MF, Reines AG, Ramos AJ. S100B alters neuronal survival and dendrite extension via RAGE-mediated NF-κB signaling. J Neurochem 2011; 117:321-32. [DOI: 10.1111/j.1471-4159.2011.07207.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|