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Huang C, Zheng Y, Ji R, Qiao L, Zhang X, Lin H, Liu F, Xu J, Li Y, Zhang Z, Yang X. GPNMB promotes peripheral nerve regeneration by activating the Erk1/2 and Akt pathways via binding Na +/K +-ATPase α1 in Schwann cells. Exp Neurol 2024; 373:114687. [PMID: 38199512 DOI: 10.1016/j.expneurol.2024.114687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 12/24/2023] [Accepted: 01/06/2024] [Indexed: 01/12/2024]
Abstract
Glycoprotein non-metastatic melanoma protein B (GPNMB) is ubiquitously expressed and has protective effects on the central nervous system. In particular, it is also expressed in the peripheral nervous system (PNS) and upregulated after peripheral nerve injury. However, the role and underlying mechanism of GPNMB in the PNS, especially in peripheral nerve regeneration (PNR), are still unknown and need to be further investigated. In this study, recombinant human GPNMB (rhGPNMB) was injected into a sciatic nerve injury model. It was found that rhGPNMB facilitated the regeneration and functional recovery of the injured sciatic nerve in vivo. Moreover, it was also confirmed that GPNMB activated the Erk1/2 and Akt pathways via binding with Na+/K + -ATPase α1 (NKA α1) and promoted the proliferation and migration of Schwann cells (SCs) and their expression and secretion of neurotrophic factors and neural adhesion molecules in vitro. Our findings demonstrate that GPNMB facilitates PNR through activation of the Erk1/2 and Akt pathways in SCs by binding with NKA α1 and may be a novel strategy for PNR.
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Affiliation(s)
- Chao Huang
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Yani Zheng
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Ruijuan Ji
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Liang Qiao
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Xi Zhang
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Haiyan Lin
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Fang Liu
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Jiajun Xu
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China
| | - Yuquan Li
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China.
| | - Zhiying Zhang
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China.
| | - Xiangqun Yang
- Department of Anatomy, Naval Medical University, #800 Xiangyin Road, Shanghai 200433, China.
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2
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Liu Y, Castano D, Girolamo F, Trigueros-Motos L, Bae HG, Neo SP, Oh J, Narayanaswamy P, Torta F, Rye KA, Jo DG, Gunaratne J, Jung S, Virgintino D, Singaraja RR. Abca8b promotes myelination via regulation of chondroitin sulfate proteoglycan 4 localization in oligodendrocyte precursor cells in mice. J Lipid Res 2021; 63:100147. [PMID: 34752805 PMCID: PMC8953628 DOI: 10.1016/j.jlr.2021.100147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/31/2021] [Accepted: 11/01/2021] [Indexed: 01/29/2023] Open
Abstract
The myelin sheath, which is wrapped around axons, is a lipid-enriched structure produced by mature oligodendrocytes. Disruption of the myelin sheath is observed in several neurological diseases, such as multiple sclerosis. A crucial component of myelin is sphingomyelin, levels of which can be increased by ABCA8, a member of the ATP-binding cassette transporter family. ABCA8 is highly expressed in the cerebellum, specifically in oligodendroglia. However, whether ABCA8 plays a role in myelination and mechanisms that would underlie this role remain unknown. Here, we found that the absence of Abca8b, a mouse ortholog of ABCA8, led to decreased numbers of cerebellar oligodendrocyte precursor cells (OPCs) and mature oligodendrocytes in mice. We show that in oligodendrocytes, ABCA8 interacts with chondroitin sulfate proteoglycan 4 (CSPG4), a molecule essential for OPC proliferation, migration, and myelination. In the absence of Abca8b, localization of CSPG4 to the plasma membrane was decreased, contributing to reduced cerebellar CSPG4 expression. Cerebellar CSPG4+ OPCs were also diminished, leading to decreased mature myelinating oligodendrocyte numbers and cerebellar myelination levels in Abca8b−/− mice. In addition, electron microscopy analyses showed that the number of nonmyelinated cerebellar axons was increased, whereas cerebellar myelin thickness (g-ratio), myelin sheath periodicity, and axonal diameter were all decreased, indicative of disordered myelin ultrastructure. In line with disrupted cerebellar myelination, Abca8b−/− mice showed lower cerebellar conduction velocity and disturbed locomotion. In summary, ABCA8 modulates cerebellar myelination, in part through functional regulation of the ABCA8-interacting protein CSPG4. Our findings suggest that ABCA8 disruption may contribute to the pathophysiology of myelin disorders.
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Affiliation(s)
- Yiran Liu
- Translational Laboratories in Genetic Medicine, Agency for Science, Technology and Research, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cardiovascular Research Institute, National University Health System, Singapore
| | - David Castano
- Translational Laboratories in Genetic Medicine, Agency for Science, Technology and Research, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cardiovascular Research Institute, National University Health System, Singapore
| | - Francesco Girolamo
- Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, Human Anatomy and Histology Unit, University of Bari School of Medicine, Bari, Italy
| | - Laia Trigueros-Motos
- Translational Laboratories in Genetic Medicine, Agency for Science, Technology and Research, Singapore
| | - Han-Gyu Bae
- Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore
| | - Suat Peng Neo
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore
| | - Jeongah Oh
- Singapore Lipidomics Incubator, Department of Biochemistry, Life Sciences Institute and Yong Loo Lin School of Medicine, National University of Singapore
| | - Pradeep Narayanaswamy
- Singapore Lipidomics Incubator, Department of Biochemistry, Life Sciences Institute and Yong Loo Lin School of Medicine, National University of Singapore
| | - Federico Torta
- Singapore Lipidomics Incubator, Department of Biochemistry, Life Sciences Institute and Yong Loo Lin School of Medicine, National University of Singapore
| | - Kerry Anne Rye
- University of New South Wales, School of Medical Sciences, Sydney, Australia
| | - Dong-Gyu Jo
- School of Pharmacy, Sungkyunkwan University, Suwon, 16419, Korea
| | - Jayantha Gunaratne
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Singapore
| | - Sangyong Jung
- Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore
| | - Daniela Virgintino
- Department of Basic Medical Sciences, Neurosciences, and Sensory Organs, Human Anatomy and Histology Unit, University of Bari School of Medicine, Bari, Italy
| | - Roshni R Singaraja
- Translational Laboratories in Genetic Medicine, Agency for Science, Technology and Research, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cardiovascular Research Institute, National University Health System, Singapore.
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Wang DW, Zheng HZ, Cha N, Zhang XJ, Zheng M, Chen MM, Tian LX. Down-Regulation of AHNAK2 Inhibits Cell Proliferation, Migration and Invasion Through Inactivating the MAPK Pathway in Lung Adenocarcinoma. Technol Cancer Res Treat 2020; 19:1533033820957006. [PMID: 33000678 PMCID: PMC7533926 DOI: 10.1177/1533033820957006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
AHNAK nucleoprotein 2 (AHNAK2) has been emerged as a crucial protein for neuroblast differentiation and cell migration, thereby involving in the development of various cancers. However, the specific molecular mechanism of AHNAK2 in lung adenocarcinoma is inconclusive. By accessing to the Oncomine dataset and GEPIA website, a higher expression level of AHNAK2 was observed in lung adenocarcinoma tissue samples. Overall survival (OS) curve plotted by Kaplan-Meier method showed that up-regulation of AHNAK2 was related with poor prognosis of lung adenocarcinoma patients. Quantitative reverse transcription polymerase chain reaction (qRT-PCR) analysis and western blot were conducted to examine the expression level of genes in lung adenocarcinoma cells. Through functional in vitro experiments, cell proliferation, migration and invasion were all suppressed after AHNAK2 knockdown using Cell counting kit-8 (CCK-8) assay, wound-healing and transwell analysis. Reduction of AHNAK2 decreased the apoptosis rate using flow cytometry analysis. Moreover, the key markers of MAPK pathway, p-MEK, p-ERK and p-P90RSK were decreased due to the transfection of si-AHNAK2 in A549 cells. U0126, a MEK inhibitor, showed the similar effects on MAPK-related protein levels with si-AHNAK2. To sum up, AHNAK2 is significantly increased in lung adenocarcinoma and plays a carcinogenic role by activating the MAPK signaling pathway, providing a novel insight and raising possibility for lung adenocarcinoma treatment.
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Affiliation(s)
- Dong-Wei Wang
- Department of Pathology, Changchun Obstetrics-Gynecology Hospital, Nanguan District, Changchun, Jilin, China
| | - Hai-Zheng Zheng
- Department of pathogen teaching and research of Changchun Medical College, Changchun Economic and Technological Development Zone, Changchun, Jilin, China
| | - Na Cha
- Department of Pathology, Changchun Obstetrics-Gynecology Hospital, Nanguan District, Changchun, Jilin, China
| | - Xiao-Jie Zhang
- Department of Obstetrics and Gynecology, Changchun Obstetrics-Gynecology Hospital, Nanguan District, Changchun, Jilin, China
| | - Min Zheng
- Department of Obstetrics and Gynecology, Changchun Obstetrics-Gynecology Hospital, Nanguan District, Changchun, Jilin, China
| | - Ming-Ming Chen
- Department of Obstetrics and Gynecology, Changchun Obstetrics-Gynecology Hospital, Nanguan District, Changchun, Jilin, China
| | - Li-Xiang Tian
- Department of Pathology, Changchun Obstetrics-Gynecology Hospital, Nanguan District, Changchun, Jilin, China
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Bocanegra JL, Fujita BM, Melton NR, Cowan JM, Schinski EL, Tamir TY, Major MB, Quintero OA. The MyMOMA domain of MYO19 encodes for distinct Miro-dependent and Miro-independent mechanisms of interaction with mitochondrial membranes. Cytoskeleton (Hoboken) 2020; 77:149-166. [PMID: 31479585 PMCID: PMC8556674 DOI: 10.1002/cm.21560] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 08/13/2019] [Accepted: 08/31/2019] [Indexed: 08/19/2023]
Abstract
MYO19 interacts with mitochondria through a C-terminal membrane association domain (MyMOMA). Specific mechanisms for localization of MYO19 to mitochondria are poorly understood. Using promiscuous biotinylation data in combination with existing affinity-capture databases, we have identified a number of putative MYO19-interacting proteins. We chose to explore the interaction between MYO19 and the mitochondrial GTPase Miro2 by expressing mchr-Miro2 in combination with GFP-tagged fragments of the MyMOMA domain and assaying for recruitment of MYO19-GFP to mitochondria. Coexpression of MYO19898-970 -GFP with mchr-Miro2 enhanced MYO19898-970 -GFP localization to mitochondria. Mislocalizing Miro2 to filopodial tips or the cytosolic face of the nuclear envelope did not recruit MYO19898-970 -GFP to either location. To address the kinetics of the Miro2/MYO19 interaction, we used FRAP analysis and permeabilization-activated reduction in fluorescence analysis. MyMOMA constructs containing a putative membrane-insertion motif but lacking the Miro2-interacting region displayed slow exchange kinetics. MYO19898-970 -GFP, which does not include the membrane-insertion motif, displayed rapid exchange kinetics, suggesting that MYO19 interacting with Miro2 has higher mobility than MYO19 inserted into the mitochondrial outer membrane. Mutation of well-conserved, charged residues within MYO19 or within the switch I and II regions of Miro2 abolished the enhancement of MYO19898-970 -GFP localization in cells ectopically expressing mchr-Miro2. Additionally, expressing mutant versions of Miro2 thought to represent particular nucleotide states indicated that the enhancement of MYO19898-970 -GFP localization is dependent on Miro2 nucleotide state. Taken together, these data suggest that membrane-inserted MYO19 is part of a larger complex, and that Miro2 plays a role in integration of actin- and microtubule-based mitochondrial activities.
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Affiliation(s)
| | | | | | - James M. Cowan
- Department of Biology, University of Richmond, Richmond, Virginia
| | | | - Tigist Y. Tamir
- Department of Pharmacology, University of North Carolina Chapel Hill, Chapel Hill, North Carolina
| | - Michael B. Major
- Department of Pharmacology, University of North Carolina Chapel Hill, Chapel Hill, North Carolina
- Department of Cell Biology and Physiology, University of North Carolina Chapel Hill, Chapel Hill, North Carolina
- Lineberger Comprehensive Cancer Center, University of North Carolina Chapel Hill, Chapel Hill, North Carolina
| | - Omar A. Quintero
- Department of Biology, University of Richmond, Richmond, Virginia
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Tricaud N. Myelinating Schwann Cell Polarity and Mechanically-Driven Myelin Sheath Elongation. Front Cell Neurosci 2018; 11:414. [PMID: 29354031 PMCID: PMC5760505 DOI: 10.3389/fncel.2017.00414] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/11/2017] [Indexed: 11/13/2022] Open
Abstract
Myelin sheath geometry, encompassing myelin sheath thickness relative to internodal length, is critical to optimize nerve conduction velocity and these parameters are carefully adjusted by the myelinating cells in mammals. In the central nervous system these adjustments could regulate neuronal activities while in the peripheral nervous system they lead to the optimization and the reliability of the nerve conduction velocity. However, the physiological and cellular mechanisms that underlie myelin sheath geometry regulation are not yet fully elucidated. In peripheral nerves the myelinating Schwann cell uses several molecular mechanisms to reach and maintain the correct myelin sheath geometry, such that myelin sheath thickness and internodal length are regulated independently. One of these mechanisms is the epithelial-like cell polarization process that occurs during the early phases of the myelin biogenesis. Epithelial cell polarization factors are known to control cell size and morphology in invertebrates and mammals making these processes critical in the organogenesis. Correlative data indicate that internodal length is regulated by postnatal body growth that elongates peripheral nerves in mammals. In addition, the mechanical stretching of peripheral nerves in adult animals shows that myelin sheath length can be increased by mechanical cues. Recent results describe the important role of YAP/TAZ co-transcription factors during Schwann cell myelination and their functions have linked to the mechanotransduction through the HIPPO pathway and the epithelial polarity factor Crb3. In this review the molecular mechanisms that govern mechanically-driven myelin sheath elongation and how a Schwann cell can modulate internodal myelin sheath length, independent of internodal thickness, will be discussed regarding these recent data. In addition, the potential relevance of these mechanosensitive mechanisms in peripheral pathologies will be highlighted.
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Affiliation(s)
- Nicolas Tricaud
- Institut National de la Santé et de la Recherche Médicale, Institut des Neurosciences de Montpellier, Université de Montpellier, Montpellier, France
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6
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Harty BL, Monk KR. Unwrapping the unappreciated: recent progress in Remak Schwann cell biology. Curr Opin Neurobiol 2017; 47:131-137. [PMID: 29096241 DOI: 10.1016/j.conb.2017.10.003] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 09/11/2017] [Accepted: 10/06/2017] [Indexed: 11/19/2022]
Abstract
Schwann cells (SCs) are specialized glial cells that myelinate and protect axons in the peripheral nervous system (PNS). Although myelinating SCs are more commonly studied, the PNS also contains a variety of non-myelinating SCs, including but not limited to Remak SCs (RSCs), terminal SCs, enteric glia. Although the field currently lacks many robust tools for interrogating the functions of non-myelinating SCs, recent evidence suggests that, like their myelinating counterparts, non-myelinating SCs are critical for proper PNS function. In this review, we focus specifically on RSCs and highlight recent advances in understanding regulators of RSC development, function, and participation in PNS regeneration.
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Affiliation(s)
- Breanne L Harty
- Department of Developmental Biology, Washington University School of Medicine, 660 S Euclid Ave, St Louis, MO 63110, USA.
| | - Kelly R Monk
- Department of Developmental Biology, Washington University School of Medicine, 660 S Euclid Ave, St Louis, MO 63110, USA; Hope Center for Neurological Disorders, Washington University School of Medicine, USA.
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7
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Chedly J, Soares S, Montembault A, von Boxberg Y, Veron-Ravaille M, Mouffle C, Benassy MN, Taxi J, David L, Nothias F. Physical chitosan microhydrogels as scaffolds for spinal cord injury restoration and axon regeneration. Biomaterials 2017; 138:91-107. [DOI: 10.1016/j.biomaterials.2017.05.024] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 05/15/2017] [Accepted: 05/16/2017] [Indexed: 01/04/2023]
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8
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Abstract
Peripheral nerves contain large myelinated and small unmyelinated (Remak) fibers that perform different functions. The choice to myelinate or not is dictated to Schwann cells by the axon itself, based on the amount of neuregulin I-type III exposed on its membrane. Peripheral axons are more important in determining the final myelination fate than central axons, and the implications for this difference in Schwann cells and oligodendrocytes are discussed. Interestingly, this choice is reversible during pathology, accounting for the remarkable plasticity of Schwann cells, and contributing to the regenerative potential of the peripheral nervous system. Radial sorting is the process by which Schwann cells choose larger axons to myelinate during development. This crucial morphogenetic step is a prerequisite for myelination and for differentiation of Remak fibers, and is arrested in human diseases due to mutations in genes coding for extracellular matrix and linkage molecules. In this review we will summarize progresses made in the last years by a flurry of reverse genetic experiments in mice and fish. This work revealed novel molecules that control radial sorting, and contributed unexpected ideas to our understanding of the cellular and molecular mechanisms that control radial sorting of axons.
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Affiliation(s)
- M Laura Feltri
- Hunter James Kelly Research Institute, Departments of Biochemistry & Neurology, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Yannick Poitelon
- Hunter James Kelly Research Institute, Departments of Biochemistry & Neurology, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Stefano Carlo Previtali
- Institute of Experimental Neurology (INSPE), Division of Neuroscience, IRCCS San Raffaele Scientific Institute, Milan, Italy
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Davis TA, Loos B, Engelbrecht AM. AHNAK: the giant jack of all trades. Cell Signal 2014; 26:2683-93. [PMID: 25172424 DOI: 10.1016/j.cellsig.2014.08.017] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 08/08/2014] [Accepted: 08/18/2014] [Indexed: 12/19/2022]
Abstract
The nucleoprotein AHNAK is an unusual and somewhat mysterious scaffolding protein characterised by its large size of approximately 700 kDa. Several aspects of this protein remain uncertain, including its exact molecular function and regulation on both the gene and protein levels. Various studies have attempted to annotate AHNAK and, notably, protein interaction and expression analyses have contributed greatly to our current understanding of the protein. The implicated biological processes are, however, very diverse, ranging from a role in the formation of the blood-brain barrier, cell architecture and migration, to the regulation of cardiac calcium channels and muscle membrane repair. In addition, recent evidence suggests that AHNAK might be yet another accomplice in the development of tumour metastasis. This review will discuss the different functional roles of AHNAK, highlighting recent advancements that have added foundation to the proposed roles while identifying ties between them. Implications for related fields of research are noted and suggestions for future research that will assist in unravelling the function of AHNAK are offered.
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Affiliation(s)
- T A Davis
- Department of Physiological Sciences, University of Stellenbosch, Mike de Vries Building, c/o Merriman Avenue and Bosman Street, Stellenbosch 7600, South Africa.
| | - B Loos
- Department of Physiological Sciences, University of Stellenbosch, Mike de Vries Building, c/o Merriman Avenue and Bosman Street, Stellenbosch 7600, South Africa
| | - A-M Engelbrecht
- Department of Physiological Sciences, University of Stellenbosch, Mike de Vries Building, c/o Merriman Avenue and Bosman Street, Stellenbosch 7600, South Africa
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