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Báez BB, Bacaglio CR, Prendergast JM, Rozés-Salvador V, Sheikh KA, Bianchet M, Farah MH, Schnaar RL, Bisbal M, Lopez PHH. Tumor necrosis factor α receptor 1A transduces the inhibitory effect on axon regeneration triggered by IgG anti-ganglioside GD1a antibodies. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167315. [PMID: 38897255 DOI: 10.1016/j.bbadis.2024.167315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 06/07/2024] [Accepted: 06/13/2024] [Indexed: 06/21/2024]
Abstract
Anti-ganglioside antibodies (anti-Gg Abs) have been linked to delayed/poor clinical recovery in both axonal and demyelinating forms of Guillain-Barrè Syndrome (GBS). In many instances, the incomplete recovery is attributed to the peripheral nervous system's failure to regenerate. The cross-linking of cell surface gangliosides by anti-Gg Abs triggers inhibition of nerve repair in both in vitro and in vivo axon regeneration paradigms. This mechanism involves the activation of the small GTPase RhoA, which negatively modulates the growth cone cytoskeleton. At present, the identity/es of the receptor/s responsible for transducing the signal that ultimately leads to RhoA activation remains poorly understood. The aim of this work was to identify the transducer molecule responsible for the inhibitory effect of anti-Gg Abs on nerve repair. Putative candidate molecules were identified through proteomic mass spectrometry of ganglioside affinity-captured proteins from rat cerebellar granule neurons (Prendergast et al., 2014). These candidates were evaluated using an in vitro model of neurite outgrowth with primary cultured dorsal root ganglion neurons (DRGn) and an in vivo model of axon regeneration. Using an shRNA-strategy to silence putative candidates on DRGn, we identified tumor necrosis factor receptor 1A protein (TNFR1A) as a transducer molecule for the inhibitory effect on neurite outgrowth from rat/mouse DRGn cultures of a well characterized mAb targeting the related gangliosides GD1a and GT1b. Interestingly, lack of TNFr1A expression on DRGn abolished the inhibitory effect on neurite outgrowth caused by anti-GD1a but not anti-GT1b specific mAbs, suggesting specificity of GD1a/transducer signaling. Similar results were obtained using primary DRGn cultures from TNFR1a-null mice, which did not activate RhoA after exposure to anti-GD1a mAbs. Generation of single point mutants at the stalk region of TNFR1A identified a critical amino acid for transducing GD1a signaling, suggesting a direct interaction. Finally, passive immunization with an anti-GD1a/GT1b mAb in an in vivo model of axon regeneration exhibited reduced inhibitory activity in TNFR1a-null mice compared to wild type mice. In conclusion, these findings identify TNFR1A as a novel transducer receptor for the inhibitory effect exerted by anti-GD1a Abs on nerve repair, representing a significant step forward toward understanding the factors contributing to poor clinical recovery in GBS associated with anti-Gg Abs.
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Affiliation(s)
- Bárbara B Báez
- Departamento de Química Biológica "Dr Ranwel Caputto", Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CIQUIBIC-CONICET-UNC, Argentina; Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martin Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Argentina
| | - Cristian R Bacaglio
- Departamento de Química Biológica "Dr Ranwel Caputto", Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CIQUIBIC-CONICET-UNC, Argentina; Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martin Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Argentina
| | - Jillian M Prendergast
- Department of Pharmacology and Molecular Sciences, School of Medicine, Johns Hopkins Medicine, Baltimore, United States
| | - Victoria Rozés-Salvador
- Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martin Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Argentina
| | - Kazim A Sheikh
- Department of Neurology, University of Texas Medical School at Houston, Houston, United States
| | - Mario Bianchet
- Department of Biophysics & Biophysical Chemistry, School of Medicine, Johns Hopkins Medicine, Baltimore, MD, United States
| | - Mohamed H Farah
- Department of Neurology and Neuroscience, School of Medicine, Johns Hopkins Medicine, Baltimore, United States
| | - Ronald L Schnaar
- Department of Pharmacology and Molecular Sciences, School of Medicine, Johns Hopkins Medicine, Baltimore, United States
| | - Mariano Bisbal
- Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martin Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Argentina
| | - Pablo H H Lopez
- Departamento de Química Biológica "Dr Ranwel Caputto", Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CIQUIBIC-CONICET-UNC, Argentina; Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martin Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Argentina.
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Albano GA, Hackam AS. Repurposing development genes for axonal regeneration following injury: Examining the roles of Wnt signaling. Front Cell Dev Biol 2024; 12:1417928. [PMID: 38882059 PMCID: PMC11176474 DOI: 10.3389/fcell.2024.1417928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/13/2024] [Indexed: 06/18/2024] Open
Abstract
In this review, we explore the connections between developmental embryology and axonal regeneration. Genes that regulate embryogenesis and central nervous system (CNS) development are discussed for their therapeutic potential to induce axonal and cellular regeneration in adult tissues after neuronal injury. Despite substantial differences in the tissue environment in the developing CNS compared with the injured CNS, recent studies have identified multiple molecular pathways that promote axonal growth in both scenarios. We describe various molecular cues and signaling pathways involved in neural development, with an emphasis on the versatile Wnt signaling pathway. We discuss the capacity of developmental factors to initiate axonal regrowth in adult neural tissue within the challenging environment of the injured CNS. Our discussion explores the roles of Wnt signaling and also examines the potential of other embryonic genes including Pax, BMP, Ephrin, SOX, CNTF, PTEN, mTOR and STAT3 to contribute to axonal regeneration in various CNS injury model systems, including spinal cord and optic crush injuries in mice, Xenopus and zebrafish. Additionally, we describe potential contributions of Müller glia redifferentiation to neuronal regeneration after injury. Therefore, this review provides a comprehensive summary of the state of the field, and highlights promising research directions for the potential therapeutic applications of specific embryologic molecular pathways in axonal regeneration in adults.
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Affiliation(s)
- Gabrielle A Albano
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, United States
| | - Abigail S Hackam
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, United States
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In vivo functions of p75 NTR: challenges and opportunities for an emerging therapeutic target. Trends Pharmacol Sci 2021; 42:772-788. [PMID: 34334250 DOI: 10.1016/j.tips.2021.06.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 05/31/2021] [Accepted: 06/28/2021] [Indexed: 12/24/2022]
Abstract
The p75 neurotrophin receptor (p75NTR) functions at the molecular nexus of cell death, survival, and differentiation. In addition to its contribution to neurodegenerative diseases and nervous system injuries, recent studies have revealed unanticipated roles of p75NTR in liver repair, fibrinolysis, lung fibrosis, muscle regeneration, and metabolism. Linking these various p75NTR functions more precisely to specific mechanisms marks p75NTR as an emerging candidate for therapeutic intervention in a wide range of disorders. Indeed, small molecule inhibitors of p75NTR binding to neurotrophins have shown efficacy in models of Alzheimer's disease (AD) and neurodegeneration. Here, we outline recent advances in understanding p75NTR pleiotropic functions in vivo, and propose an integrated view of p75NTR and its challenges and opportunities as a pharmacological target.
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Wu Q, Miao X, Zhang J, Xiang L, Li X, Bao X, Du S, Wang M, Miao S, Fan Y, Wang W, Xu X, Shen X, Yang D, Wang X, Fang Y, Hu L, Pan X, Dong H, Wang H, Wang Y, Li J, Huang Z. Astrocytic YAP protects the optic nerve and retina in an experimental autoimmune encephalomyelitis model through TGF-β signaling. Theranostics 2021; 11:8480-8499. [PMID: 34373754 PMCID: PMC8344002 DOI: 10.7150/thno.60031] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 07/06/2021] [Indexed: 02/07/2023] Open
Abstract
Rationale: Optic neuritis is one of main symptoms in multiple sclerosis (MS) that causes visual disability. Astrocytes are pivotal regulators of neuroinflammation in MS, and astrocytic yes-associated protein (YAP) plays a critical role in neuroinflammation. Meanwhile, YAP signaling is involved in visual impairment, including glaucoma, retinal choroidal atrophy and retinal detachment. However, the roles and underlying mechanisms of astrocytic YAP in neuroinflammation and demyelination of MS-related optic neuritis (MS-ON) remains unclear. Methods: To assess the functions of YAP in MS-ON, experimental autoimmune encephalomyelitis (EAE, a common model of MS) was established, and mice that conditional knockout (CKO) of YAP in astrocytes, YAPGFAP-CKO mice, were successfully generated. Behavior tests, immunostaining, Nissl staining, Hematoxylin-Eosin (HE) staining, TUNEL staining, Luxol Fast Blue (LFB) staining, electron microscopy (EM), quantitative real-time PCR (qPCR), gene set enrichment analysis (GSEA) and gene set variation analysis (GSVA) by RNA sequencing were used to examine the function and mechanism of YAP signaling based on these YAPGFAP-CKO mice and EAE model mice. To further explore the potential treatment of YAP signaling in EAE, EAE mice were treated with various drugs, including SRI-011381 that is an agonist of transforming growth factor-β (TGF-β) pathway, and XMU-MP-1 which inhibits Hippo kinase MST1/2 to activate YAP. Results: We found that YAP was significantly upregulated and activated in the astrocytes of optic nerve in EAE mice. Conditional knockout of YAP in astrocytes caused more severe inflammatory infiltration and demyelination in optic nerve, and damage of retinal ganglion cells (RGCs) in EAE mice. Moreover, YAP deletion in astrocytes promoted the activation of astrocytes and microglia, but inhibited the proliferation of astrocytes of optic nerve in EAE mice. Mechanically, TGF-β signaling pathway was significantly down-regulated after YAP deletion in astrocytes. Additionally, both qPCR and immunofluorescence assays confirmed the reduction of TGF-β signaling pathway in YAPGFAP-CKO EAE mice. Interestingly, SRI-011381 partially rescued the deficits in optic nerve and retina of YAPGFAP-CKO EAE mice. Finally, activation of YAP signaling by XMU-MP-1 relieved the neuroinflammation and demyelination in optic nerve of EAE mice. Conclusions: These results suggest astrocytic YAP may prevent the neuroinflammatory infiltration and demyelination through upregulation of TGF-β signaling and provide targets for the development of therapeutic strategies tailored for MS-ON.
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Mizoguchi Y, Ohgidani M, Haraguchi Y, Murakawa-Hirachi T, Kato TA, Monji A. ProBDNF induces sustained elevation of intracellular Ca 2+ possibly mediated by TRPM7 channels in rodent microglial cells. Glia 2021; 69:1694-1708. [PMID: 33740269 DOI: 10.1002/glia.23996] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 03/03/2021] [Accepted: 03/05/2021] [Indexed: 01/07/2023]
Abstract
Microglia are intrinsic immune cells that release factors including pro- and anti-inflammatory cytokines, nitric oxide (NO) and neurotrophins following activation in the brain. Elevation of intracellular Ca2+ concentration ([Ca2+ ]i) is important for microglial functions, such as the release of cytokines or NO from activated microglia. Brain-derived neurotrophic factor (BDNF) is a neurotrophin well known for its roles in the activation of microglia. Interestingly, proBDNF, the precursor form of mature BDNF, and mature BDNF elicit opposing neuronal responses in the brain. Mature BDNF induces sustained intracellular Ca2+ elevation through the upregulation of the surface expression of TRPC3 channels in rodent microglial cells. In addition, TRPC3 channels are important for the BDNF-induced suppression of NO production in activated microglia. In this study, we observed that proBDNF and mature BDNF have opposite effects on the relative expression of surface p75 neurotrophin receptor (p75NTR ) in rodent microglial cells. ProBDNF induces a sustained elevation of [Ca2+ ]i through binding to the p75NTR , which is possibly mediated by Rac 1 activation and TRPM7 channels in rodent microglial cells. Flow cytometry showed that proBDNF increased the relative surface expression of TRPM7. Although proBDNF did not affect either mRNA expression of pro- and anti-inflammatory cytokines or the phagocytic activity, proBDNF potentiates the generation of NO induced by IFN-γ and TRPM7 channels could be involved in the proBDNF-induced potentiation of IFN-γ-mediated production of NO. We show direct evidence that rodent microglial cells are able to respond to proBDNF, which might be important for the regulation of inflammatory responses in the brain.
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Affiliation(s)
- Yoshito Mizoguchi
- Department of Psychiatry, Faculty of Medicine, Saga University, Saga, Japan
| | - Masahiro Ohgidani
- Department of Psychiatry, Faculty of Medicine, Saga University, Saga, Japan.,Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.,Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | | | | | - Takahiro A Kato
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Akira Monji
- Department of Psychiatry, Faculty of Medicine, Saga University, Saga, Japan
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Yang SG, Li CP, Peng XQ, Teng ZQ, Liu CM, Zhou FQ. Strategies to Promote Long-Distance Optic Nerve Regeneration. Front Cell Neurosci 2020; 14:119. [PMID: 32477071 PMCID: PMC7240020 DOI: 10.3389/fncel.2020.00119] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 04/14/2020] [Indexed: 02/06/2023] Open
Abstract
Mammalian retinal ganglion cells (RGCs) in the central nervous system (CNS) often die after optic nerve injury and surviving RGCs fail to regenerate their axons, eventually resulting in irreversible vision loss. Manipulation of a diverse group of genes can significantly boost optic nerve regeneration of mature RGCs by reactivating developmental-like growth programs or suppressing growth inhibitory pathways. By injury of the vision pathway near their brain targets, a few studies have shown that regenerated RGC axons could form functional synapses with targeted neurons but exhibited poor neural conduction or partial functional recovery. Therefore, the functional restoration of eye-to-brain pathways remains a greatly challenging issue. Here, we review recent advances in long-distance optic nerve regeneration and the subsequent reconnecting to central targets. By summarizing our current strategies for promoting functional recovery, we hope to provide potential insights into future exploration in vision reformation after neural injuries.
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Affiliation(s)
- Shu-Guang Yang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Chang-Ping Li
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Xue-Qi Peng
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Zhao-Qian Teng
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Chang-Mei Liu
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Feng-Quan Zhou
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, United States.,The Solomon H. Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD, United States
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Schilling J, Kassan A, Mandyam C, Pearn M, Voong A, Grogman G, Risbrough V, Niesman I, Patel H, Patel P, Head B. Inhibition of p75 neurotrophin receptor does not rescue cognitive impairment in adulthood after isoflurane exposure in neonatal mice. Br J Anaesth 2017; 119:465-471. [PMID: 28969308 PMCID: PMC6172965 DOI: 10.1093/bja/aew299] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Isoflurane is widely used for anaesthesia in humans. Isoflurane exposure of rodents prior to post-natal day 7 (PND7) leads to widespread neurodegeneration in laboratory animals. Previous data from our laboratory suggest an attenuation of apoptosis with the p75 neurotrophin receptor (p75NTR) inhibitor TAT-Pep5. We hypothesized that isoflurane toxicity leads to behavioural and cognitive abnormalities and can be rescued with pre-anaesthesia administration of TAT-Pep5. METHODS Neonatal mouse pups were pretreated with either TAT-Pep5 (25 μl, 10 μM i.p.) or a scrambled control peptide (TAT-ctrl; 25 μl, 10 μM i.p.) prior to isoflurane exposure (1.4%; 4 h) or control ( n = 15-26/group). Three to 5 months after exposure, behavioural testing and endpoint assays [brain volume (stereology) and immunoblotting] were performed. RESULTS No significant difference was observed in open field, T-maze, balance beam or wire-hanging testing. The Barnes maze revealed a significant effect of isoflurane ( P = 0.019) in errors to find the escape tunnel during the day 5 probe trial, a finding indicative of impaired short-term spatial memory. No difference was found for brain volumes or protein expression. TAT-Pep5 treatment did not reverse the effects of isoflurane on neurocognitive behaviour. CONCLUSION A single isoflurane exposure to early post-natal mice caused a hippocampal-dependent memory deficit that was not prevented by pre-administration of TAT-Pep5, although TAT-Pep5, an inhibitor of p75NTR, has been shown to reduce isoflurane-induced apoptosis. These findings suggest that neuronal apoptosis is not requisite for the development of cognitive deficits in the adults attendant with neonatal anaesthetic exposure.
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Affiliation(s)
- J.M. Schilling
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - A. Kassan
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - C. Mandyam
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, School of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - M.L. Pearn
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - A. Voong
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - G.G. Grogman
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - V.B. Risbrough
- Departments of Psychiatry and Anesthesiology, University of California, San Diego, La Jolla, CA, USA
| | - I.R. Niesman
- Department of Cellular & Molecular Medicine—Sanford Consortium for Regenerative Medicine, University of California, San Diego, La Jolla, CA, USA
| | - H.H. Patel
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - P.M. Patel
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - B.P. Head
- Department of Anesthesiology, Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA
- Department of Anesthesiology, School of Medicine, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093, USA
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Sebastiani A, Gölz C, Werner C, Schäfer MKE, Engelhard K, Thal SC. Proneurotrophin Binding to P75 Neurotrophin Receptor (P75ntr) Is Essential for Brain Lesion Formation and Functional Impairment after Experimental Traumatic Brain Injury. J Neurotrauma 2015; 32:1599-607. [PMID: 25879397 DOI: 10.1089/neu.2014.3751] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Traumatic brain injury (TBI) initiates an excessive mediator release of e.g. neurotrophins, which promote neuronal survival, differentiation, and modulate synaptic plasticity. Paradoxically, mature forms of neurotrophins promote neuronal survival, whereas unprocessed forms of neurotrophins induce cell death through p75 neurotrophin receptor (p75NTR) signaling. p75NTR is widely expressed during synaptogenesis and is subsequently downregulated in adulthood. Repair mechanisms after acute cerebral insults can reactivate its expression. Therefore, the influence of p75NTR on secondary brain damage was addressed. mRNA levels of p75NTR and its ligands were quantified in brain tissue up to 7 days after experimental TBI (controlled cortical impact; CCI). Brain damage, motor function and inflammatory marker gene expression were determined in mice lacking the proneurotrophin-binding site of the p75NTR protein (NGFR(-/-)) and wild type littermates (NGFR(+/+)) 24 h and 5 days after CCI. In addition, the effect of TAT-Pep5 (pharmacological inhibitor of the intracellular p75NTR death domain) on lesion volume was evaluated 24 h after insult. p75NTR mRNA levels were induced nine-fold by TBI. In NGFR(-/-) mice, lesion volume was reduced by 29% at 24 h and by 21% 5 days after CCI. Motor coordination was significantly improved 24 h after trauma compared with the wild type. Pharmacological inhibition of the p75NTR signaling reduced lesion volume by 18%. The present study presents first time evidence that genetic mutation of the neurotrophin interaction site of p75NTR strongly limits post-traumatic cell death. In addition, we revealed pharmacological targeting of the intracellular p75NTR cell death domain as a promising approach to limit acute brain damage.
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Affiliation(s)
- Anne Sebastiani
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University , Mainz, Germany
| | - Christina Gölz
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University , Mainz, Germany
| | - Christian Werner
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University , Mainz, Germany
| | - Michael K E Schäfer
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University , Mainz, Germany
| | - Kristin Engelhard
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University , Mainz, Germany
| | - Serge C Thal
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University , Mainz, Germany
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Niklison-Chirou MV, Killick R, Knight RA, Nicotera P, Melino G, Agostini M. How Does p73 Cause Neuronal Defects? Mol Neurobiol 2015; 53:4509-20. [PMID: 26266644 DOI: 10.1007/s12035-015-9381-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 07/27/2015] [Indexed: 11/25/2022]
Abstract
The p53-family member, p73, plays a key role in the development of the central nervous system (CNS), in senescence, and in tumor formation. The role of p73 in neuronal differentiation is complex and involves several downstream pathways. Indeed, in the last few years, we have learnt that TAp73 directly or indirectly regulates several genes involved in neural biology. In particular, TAp73 is involved in the maintenance of neural stem/progenitor cell self-renewal and differentiation throughout the regulation of SOX-2, Hey-2, TRIM32 and Notch. In addition, TAp73 is also implicated in the regulation of the differentiation and function of postmitotic neurons by regulating the expression of p75NTR and GLS2 (glutamine metabolism). Further still, the regulation of miR-34a by TAp73 indicates that microRNAs can also participate in this multifunctional role of p73 in adult brain physiology. However, contradictory results still exist in the relationship between p73 and brain disorders, and this remains an important area for further investigation.
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Affiliation(s)
- Maria Victoria Niklison-Chirou
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK
- Blizard Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Richard Killick
- The Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London, SE5 8AF, UK
| | - Richard A Knight
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK
| | | | - Gerry Melino
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK.
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133, Rome, Italy.
| | - Massimiliano Agostini
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK.
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133, Rome, Italy.
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Ma S, Peng C, Wu S, Wu D, Gao C. Sciatic nerve regeneration using a nerve growth factor-containing fibrin glue membrane. Neural Regen Res 2014; 8:3416-22. [PMID: 25206664 PMCID: PMC4146009 DOI: 10.3969/j.issn.1673-5374.2013.36.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Accepted: 11/02/2013] [Indexed: 01/23/2023] Open
Abstract
Our previous findings confirmed that the nerve growth factor-containing fibrin glue membrane provides a good microenvironment for peripheral nerve regeneration; however, the precise mechanism remains unclear. p75 neurotrophin receptor (p75(NTR)) plays an important role in the regulation of peripheral nerve regeneration. We hypothesized that a nerve growth factor-containing fibrin glue membrane can promote neural regeneration by up-regulating p75(NTR) expression. In this study, we used a silicon nerve conduit to bridge a 15 mm-long sciatic nerve defect and injected a mixture of nerve growth factor and fibrin glue at the anastomotic site of the nerve conduit and the sciatic nerve. Through RT-PCR and western blot analysis, nerve growth factor-containing fibrin glue membrane significantly increased p75(NTR) mRNA and protein expression in the Schwann cells at the anastomotic site, in particular at 8 weeks after injection of the nerve growth factor/fibrin glue mixture. These results indicate that nerve growth factor-containing fibrin glue membrane can promote peripheral nerve regeneration by up-regulating p75(NTR) expression in Schwann cells.
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Affiliation(s)
- Shengzhong Ma
- Department of Orthopedics, Second Affiliated Hospital of Shandong University, Jinan 250033, Shandong Province, China
| | - Changliang Peng
- Department of Orthopedics, Second Affiliated Hospital of Shandong University, Jinan 250033, Shandong Province, China
| | - Shiqing Wu
- Department of Orthopedics, Second Affiliated Hospital of Shandong University, Jinan 250033, Shandong Province, China
| | - Dongjin Wu
- Department of Orthopedics, Second Affiliated Hospital of Shandong University, Jinan 250033, Shandong Province, China
| | - Chunzheng Gao
- Department of Orthopedics, Second Affiliated Hospital of Shandong University, Jinan 250033, Shandong Province, China
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