1
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Nakagawa N, Iwasato T. Golgi polarity shift instructs dendritic refinement in the neonatal cortex by mediating NMDA receptor signaling. Cell Rep 2023; 42:112843. [PMID: 37516101 DOI: 10.1016/j.celrep.2023.112843] [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: 03/07/2023] [Revised: 05/15/2023] [Accepted: 07/05/2023] [Indexed: 07/31/2023] Open
Abstract
Dendritic refinement is a critical component of activity-dependent neuronal circuit maturation, through which individual neurons establish specific connectivity with their target axons. Here, we demonstrate that the developmental shift of Golgi polarity is a key process in dendritic refinement. During neonatal development, the Golgi apparatus in layer 4 spiny stellate (SS) neurons in the mouse barrel cortex lose their original apical positioning and acquire laterally polarized distributions. This lateral Golgi polarity, which is oriented toward the barrel center, peaks on postnatal days 5-7 (P5-P7) and disappears by P15, which aligns with the developmental time course of SS neuron dendritic refinement. Genetic ablation of N-methyl-D-aspartate (NMDA) receptors, key players in dendritic refinement, disturbs the lateral Golgi polarity. Golgi polarity manipulation disrupts the asymmetric dendritic projection pattern and the primary-whisker-specific response of SS neurons. Our results elucidate activity-dependent Golgi dynamics and their critical role in developmental neuronal circuit refinement.
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Affiliation(s)
- Naoki Nakagawa
- Laboratory of Mammalian Neural Circuits, National Institute of Genetics (NIG), Mishima, Shizuoka 411-8540, Japan; Graduate Institute for Advanced Studies, SOKENDAI, Mishima, Shizuoka 411-8540, Japan.
| | - Takuji Iwasato
- Laboratory of Mammalian Neural Circuits, National Institute of Genetics (NIG), Mishima, Shizuoka 411-8540, Japan; Graduate Institute for Advanced Studies, SOKENDAI, Mishima, Shizuoka 411-8540, Japan.
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2
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Villalonga E, Mosrin C, Normand T, Girardin C, Serrano A, Žunar B, Doudeau M, Godin F, Bénédetti H, Vallée B. LIM Kinases, LIMK1 and LIMK2, Are Crucial Node Actors of the Cell Fate: Molecular to Pathological Features. Cells 2023; 12:cells12050805. [PMID: 36899941 PMCID: PMC10000741 DOI: 10.3390/cells12050805] [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: 01/30/2023] [Revised: 02/28/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
LIM kinase 1 (LIMK1) and LIM kinase 2 (LIMK2) are serine/threonine and tyrosine kinases and the only two members of the LIM kinase family. They play a crucial role in the regulation of cytoskeleton dynamics by controlling actin filaments and microtubule turnover, especially through the phosphorylation of cofilin, an actin depolymerising factor. Thus, they are involved in many biological processes, such as cell cycle, cell migration, and neuronal differentiation. Consequently, they are also part of numerous pathological mechanisms, especially in cancer, where their involvement has been reported for a few years and has led to the development of a wide range of inhibitors. LIMK1 and LIMK2 are known to be part of the Rho family GTPase signal transduction pathways, but many more partners have been discovered over the decades, and both LIMKs are suspected to be part of an extended and various range of regulation pathways. In this review, we propose to consider the different molecular mechanisms involving LIM kinases and their associated signalling pathways, and to offer a better understanding of their variety of actions within the physiology and physiopathology of the cell.
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Affiliation(s)
- Elodie Villalonga
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Christine Mosrin
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Thierry Normand
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Caroline Girardin
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Amandine Serrano
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Bojan Žunar
- Laboratory for Biochemistry, Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia
| | - Michel Doudeau
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Fabienne Godin
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Hélène Bénédetti
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
| | - Béatrice Vallée
- Centre de Biophysique Moléculaire; UPR4301, CNRS, University of Orleans and INSERM, CEDEX 2, 45071 Orleans, France
- Correspondence: ; Tel.: +33-(0)2-38-25-76-11
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3
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BARS Influences Neuronal Development by Regulation of Post-Golgi Trafficking. Cells 2022; 11:cells11081320. [PMID: 35455998 PMCID: PMC9026897 DOI: 10.3390/cells11081320] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/28/2022] [Accepted: 04/08/2022] [Indexed: 02/01/2023] Open
Abstract
Neurons are highly polarized cells requiring precise regulation of trafficking and targeting of membrane proteins to generate and maintain different and specialized compartments, such as axons and dendrites. Disruption of the Golgi apparatus (GA) secretory pathway in developing neurons alters axon/dendritic formation. Therefore, detailed knowledge of the mechanisms underlying vesicles exiting from the GA is crucial for understanding neuronal polarity. In this study, we analyzed the role of Brefeldin A-Ribosylated Substrate (CtBP1-S/BARS), a member of the C-terminal-binding protein family, in the regulation of neuronal morphological polarization and the exit of membrane proteins from the Trans Golgi Network. Here, we show that BARS is expressed during neuronal development in vitro and that RNAi suppression of BARS inhibits axonal and dendritic elongation in hippocampal neuronal cultures as well as largely perturbed neuronal migration and multipolar-to-bipolar transition during cortical development in situ. In addition, using plasma membrane (PM) proteins fused to GFP and engineered with reversible aggregation domains, we observed that expression of fission dominant-negative BARS delays the exit of dendritic and axonal membrane protein-containing carriers from the GA. Taken together, these data provide the first set of evidence suggesting a role for BARS in neuronal development by regulating post-Golgi membrane trafficking.
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4
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Luna S, Neila LP, Vena R, Borgatello C, Rosso SB. Glyphosate exposure induces synaptic impairment in hippocampal neurons and cognitive deficits in developing rats. Arch Toxicol 2021; 95:2137-2150. [PMID: 33837468 DOI: 10.1007/s00204-021-03046-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 04/01/2021] [Indexed: 10/21/2022]
Abstract
Glyphosate is the active ingredient of several widely used herbicide formulations. Studies based on Glyphosate exposure in different experimental models have suggested that the nervous system represented a key target for its toxicity. Previously, we demonstrated that exposure to glyphosate during gestation induces deficits on behavioral and cognitive function in rats. The aim of the present work was to examine whether cognitive dysfunction induced by Glyphosate was connected to changes on synapse formation and maturation. To understand how glyphosate affects synaptic assembly, we performed in vitro assays on cultured hippocampal neurons that were exposed to the herbicide (0.5 or 1 mg/mL) for 5 or 10 days. Biochemical and immunocytochemical approaches revealed that Glyphosate treated neurons showed a decrease on dendritic complexity and synaptic spine formation and maturation. Moreover, results indicated that Glyphosate decreased synapse formation in hippocampal neurons. To evaluate these effects in vivo, pup rats were treated with 35 or 70 mg/kg of Glyphosate from PND 7 to PND 27, every 48 h. Results indicated that Glyphosate postnatal exposure induced cognitive impairments, since recognition and spatial memory were altered. To go further, we evaluated synaptic protein expression and synaptic organization in hippocampus. Images revealed that Glyphosate treatment downregulates synapsin-1, PSD-95, and CaMKII expression, and also decreased PSD-95 clustering in hippocampus. Taken together, these findings demonstrate for the first time that Glyphosate exposure affects synaptic assembly and reduced synaptic protein expression in hippocampus and that likely triggers the impairment of cognitive function and neuronal connectivity.
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Affiliation(s)
- Sebastian Luna
- Área Toxicología, Departamento de Ciencias de Los Alimentos Y Medio Ambiente. Facultad de Ciencias Bioquímicas Y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK, Rosario, Santa Fe, Argentina
- Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina
| | - Lorena P Neila
- Área Toxicología, Departamento de Ciencias de Los Alimentos Y Medio Ambiente. Facultad de Ciencias Bioquímicas Y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK, Rosario, Santa Fe, Argentina
- Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina
| | - Rodrigo Vena
- Instituto de Biología Molecular Y Celular de Rosario, Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina
| | - Conrado Borgatello
- Área Toxicología, Departamento de Ciencias de Los Alimentos Y Medio Ambiente. Facultad de Ciencias Bioquímicas Y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK, Rosario, Santa Fe, Argentina
- Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina
| | - Silvana B Rosso
- Área Toxicología, Departamento de Ciencias de Los Alimentos Y Medio Ambiente. Facultad de Ciencias Bioquímicas Y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK, Rosario, Santa Fe, Argentina.
- Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina.
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5
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Pinto MJ, Tomé D, Almeida RD. The Ubiquitinated Axon: Local Control of Axon Development and Function by Ubiquitin. J Neurosci 2021; 41:2796-2813. [PMID: 33789876 PMCID: PMC8018891 DOI: 10.1523/jneurosci.2251-20.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 01/15/2021] [Accepted: 01/22/2021] [Indexed: 02/01/2023] Open
Abstract
Ubiquitin tagging sets protein fate. With a wide range of possible patterns and reversibility, ubiquitination can assume many shapes to meet specific demands of a particular cell across time and space. In neurons, unique cells with functionally distinct axons and dendrites harboring dynamic synapses, the ubiquitin code is exploited at the height of its power. Indeed, wide expression of ubiquitination and proteasome machinery at synapses, a diverse brain ubiquitome, and the existence of ubiquitin-related neurodevelopmental diseases support a fundamental role of ubiquitin signaling in the developing and mature brain. While special attention has been given to dendritic ubiquitin-dependent control, how axonal biology is governed by this small but versatile molecule has been considerably less discussed. Herein, we set out to explore the ubiquitin-mediated spatiotemporal control of an axon's lifetime: from its differentiation and growth through presynaptic formation, function, and pruning.
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Affiliation(s)
- Maria J Pinto
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, 3004-504, Portugal
| | - Diogo Tomé
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, 3004-504, Portugal
- Institute of Biomedicine, Department of Medical Sciences, University of Aveiro, Aveiro, 3810-193, Portugal
| | - Ramiro D Almeida
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, 3004-504, Portugal
- Institute of Biomedicine, Department of Medical Sciences, University of Aveiro, Aveiro, 3810-193, Portugal
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6
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Perea Vega ML, Sanchez MS, Fernández G, Paglini MG, Martin M, de Barioglio SR. Ghrelin treatment leads to dendritic spine remodeling in hippocampal neurons and increases the expression of specific BDNF-mRNA species. Neurobiol Learn Mem 2021; 179:107409. [PMID: 33609738 DOI: 10.1016/j.nlm.2021.107409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 02/02/2021] [Accepted: 02/11/2021] [Indexed: 11/15/2022]
Abstract
Ghrelin (Gr) is an orexigenic peptide that acts via its specific receptor, GHSR-1a distributed throughout the brain, being mainly enriched in pituitary, cortex and hippocampus (Hp) modulating a variety of brain functions. Behavioral, electrophysiological and biochemical evidence indicated that Gr modulates the excitability and the synaptic plasticity in Hp. The present experiments were designed in order to extend the knowledge about the Gr effect upon structural synaptic plasticity since morphological and quantitative changes in spine density after Gr administration were analyzed "in vitro" and "in vivo". The results show that Gr administered to hippocampal cultures or stereotactically injected in vivo to Thy-1 mice increases the density of dendritic spines (DS) being the mushroom type highly increased in secondary and tertiary extensions. Spines classified as thin type were increased particularly in primary extensions. Furthermore, we show that Gr enhances selectively the expression of BDNF-mRNA species.
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Affiliation(s)
- M L Perea Vega
- Departamento de Farmacología, Instituto de Farmacología Experimental-IFEC-CONICET-Universidad Nacional de Córdoba, Argentina
| | - M S Sanchez
- Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martín Ferreyra-INIMEC-CONICET-Universidad Nacional de Córdoba. Córdoba, Argentina; Instituto Universitario Ciencias Biomédicas Córdoba, Córdoba, Argentina
| | - G Fernández
- Laboratorio de Neurofisiología, Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - M G Paglini
- Laboratorio de Neurofisiología, Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - M Martin
- Laboratorio de Neurobiología, Instituto de Investigación Médica Mercedes y Martín Ferreyra-INIMEC-CONICET-Universidad Nacional de Córdoba. Córdoba, Argentina
| | - S R de Barioglio
- Departamento de Farmacología, Instituto de Farmacología Experimental-IFEC-CONICET-Universidad Nacional de Córdoba, Argentina.
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7
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Gao TT, Wang Y, Liu L, Wang JL, Wang YJ, Guan W, Chen TT, Zhao J, Jiang B. LIMK1/2 in the mPFC Plays a Role in Chronic Stress-Induced Depressive-Like Effects in Mice. Int J Neuropsychopharmacol 2020; 23:821-836. [PMID: 32827213 PMCID: PMC7770523 DOI: 10.1093/ijnp/pyaa067] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 08/14/2020] [Accepted: 08/20/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Depression is one of the most common forms of mental illness and also a leading cause of disability worldwide. Developing novel antidepressant targets beyond the monoaminergic systems is now popular and necessary. LIM kinases, including LIM domain kinase 1 and 2 (LIMK1/2), play a key role in actin and microtubule dynamics through phosphorylating cofilin. Since depression is associated with atrophy of neurons and reduced connectivity, here we speculate that LIMK1/2 may play a role in the pathogenesis of depression. METHODS In this study, the chronic unpredictable mild stress (CUMS), chronic restraint stress (CRS), and chronic social defeat stress (CSDS) models of depression, various behavioral tests, stereotactic injection, western blotting, and immunofluorescence methods were adopted. RESULTS CUMS, CRS, and CSDS all significantly enhanced the phosphorylation levels of LIMK1 and LIMK2 in the medial prefrontal cortex (mPFC) but not the hippocampus of mice. Administration of fluoxetine, the most commonly used selective serotonin reuptake inhibitor in clinical practice, fully reversed the effects of CUMS, CRS, and CSDS on LIMK1 and LIMK2 in the mPFC. Moreover, pharmacological inhibition of LIMK1 and LIMK2 in the mPFC by LIMKi 3 infusions notably prevented the pro-depressant effects of CUMS, CRS, and CSDS in mice. CONCLUSIONS In summary, these results suggest that LIMK1/2 in the mPFC has a role in chronic stress-induced depressive-like effects in mice and could be a novel pharmacological target for developing antidepressants.
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Affiliation(s)
- Ting-Ting Gao
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Yuan Wang
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Ling Liu
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Jin-Liang Wang
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Ying-Jie Wang
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Wei Guan
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Ting-Ting Chen
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China
| | - Jie Zhao
- Department of Pharmacy, The Sixth People’s Hospital of Nantong, Nantong, Jiangsu, China
| | - Bo Jiang
- Department of Pharmacology, School of Pharmacy, Nantong University, Nantong, Jiangsu, China,Provincial key laboratory of Inflammation and Molecular Drug Target, Jiangsu, China,Correspondence: Bo Jiang, MD, PhD, Department of Pharmacology, School of Pharmacy, Nantong University, No. 19 QiXiu Road, Nantong 226001, Jiangsu, China ()
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8
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Amano G, Matsuzaki S, Mori Y, Miyoshi K, Han S, Shikada S, Takamura H, Yoshimura T, Katayama T. SCYL1 arginine methylation by PRMT1 is essential for neurite outgrowth via Golgi morphogenesis. Mol Biol Cell 2020; 31:1963-1973. [PMID: 32583741 PMCID: PMC7543066 DOI: 10.1091/mbc.e20-02-0100] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Arginine methylation is a common posttranslational modification that modulates protein function. SCY1-like pseudokinase 1 (SCYL1) is crucial for neuronal functions and interacts with γ2-COP to form coat protein complex I (COPI) vesicles that regulate Golgi morphology. However, the molecular mechanism by which SCYL1 is regulated remains unclear. Here, we report that the γ2-COP-binding site of SCYL1 is arginine-methylated by protein arginine methyltransferase 1 (PRMT1) and that SCYL1 arginine methylation is important for the interaction of SCYL1 with γ2-COP. PRMT1 was colocalized with SCYL1 in the Golgi fraction. Inhibition of PRMT1 suppressed axon outgrowth and dendrite complexity via abnormal Golgi morphology. Knockdown of SCYL1 by small interfering RNA (siRNA) inhibited axon outgrowth, and the inhibitory effect was rescued by siRNA-resistant SCYL1, but not SCYL1 mutant, in which the arginine methylation site was replaced. Thus, PRMT1 regulates Golgi morphogenesis via SCYL1 arginine methylation. We propose that SCYL1 arginine methylation by PRMT1 contributes to axon and dendrite morphogenesis in neurons.
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Affiliation(s)
- Genki Amano
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shinsuke Matsuzaki
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.,Department of Pharmacology, Wakayama Medical University, 811-1 Kimiidera, Wakayama 641-0012, Japan
| | - Yasutake Mori
- Department of Anatomy and Neuroscience, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.,Department of Anatomy, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba, 286-8686, Japan
| | - Ko Miyoshi
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Sarina Han
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Sho Shikada
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hironori Takamura
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takeshi Yoshimura
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Taiichi Katayama
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
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9
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Lázaro-Diéguez F, Müsch A. Low Rho activity in hepatocytes prevents apical from basolateral cargo separation during trans-Golgi network to surface transport. Traffic 2020; 21:364-374. [PMID: 32124512 PMCID: PMC7959587 DOI: 10.1111/tra.12725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/27/2020] [Accepted: 02/28/2020] [Indexed: 12/24/2022]
Abstract
Hepatocytes, the main epithelial cells of the liver, organize their polarized membrane domains differently from ductal epithelia. They also differ in their biosynthetic delivery of single-membrane-spanning and glycophosphatidylinositol-anchored proteins to the apical domain. While ductal epithelia target apical proteins to varying degrees from the trans-Golgi network (TGN) to the apical surface directly, hepatocytes target them first to the basolateral domain, from where they undergo basolateral-to-apical transcytosis. How TGN-to-surface transport differs in both scenarios is unknown. Here, we report that the basolateral detour of a hepatocyte apical protein is due, in part, to low RhoA activity at the TGN, which prevents its segregation from basolateral transport carriers. Activating Rho in hepatocytic cells, which switches their polarity from hepatocytic to ductal, also led to apical-basolateral cargo segregation at the TGN as is typical for ductal cells, affirming a central role for Rho-signaling in different aspects of the hepatocytic polarity phenotype. Nevertheless, Rho-induced cargo segregation was not sufficient to target the apical protein directly; thus, failure to recruit apical targeting machinery also contributes to its indirect itinerary.
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Affiliation(s)
- Francisco Lázaro-Diéguez
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York
| | - Anne Müsch
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York
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10
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Zhang N, Ye W, Wang T, Wen H, Yao L. Up-regulation of miR-106a targets LIMK1 and contributes to cognitive impairment induced by isoflurane anesthesia in mice. Genes Genomics 2020; 42:405-412. [PMID: 31933141 DOI: 10.1007/s13258-019-00913-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 12/30/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Postoperative cognitive dysfunction (POCD) had a great relationship with anesthesia during surgery, and miRNAs have been found involved in anesthesia-induced cognitive impairment. OBJECTIVE To explore the role and potential mechanism of miR-106a in isoflurane anesthesia-induced cognitive impairment. METHODS Adult male mice were treated with isoflurane anesthesia; Morris water maze tests and fear conditioning tests were performed; and expression levels of miR-106a and LIMK1 were determined by quantitative real-time PCR (qRT-PCR) and western blot. Dual luciferase reporter assay was used to determine the binding of miR-106a and 3'UTR of LIMK1. To verify the role of miR-106a, antagomir of miR-106a were intrahippocampally injected. Finally, expression of BCL2 apoptosis regulator (Bcl-2), LIM domain kinase 1 (LIMK1), BCL2-associated X, apoptosis regulator (Bax) and cleaved caspase3 was determined by western blot. RESULTS In isoflurane anesthesia-treated group (IS), the percentage of target quadrant dwell time was significantly lower and the escape latency was significantly higher than in the control group (sham), and the freezing behavior of IS was significantly less in contextual fear conditioning tests. Expression levels of miR-106a were increased and those of LIMK1 were decreased in response to IS. Dual luciferase reporter assay showed that miR-106a could bind with the 3'UTR of LIMK1. Decreased expression levels of miR-106a improved the cognitive impairment of the mice treated with isoflurane. Intrahippocampally injected antagomir of miR-106a also increased LIMK1 and Bcl-2 levels, decreased the BAX and cleaved caspase3 expression levels in the mice treated with isoflurane. CONCLUSION Decrease of LIMK1 expression by miR-106a played an important role in isoflurane anesthesia-induced cognitive impairment.
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Affiliation(s)
- Ning Zhang
- Department of Anesthesia, Peking University International Hospital, No. 1, Life Garden Road, Zhongguancun Life Garden, Changping District, Beijing, China
| | - Weiguang Ye
- Department of Anesthesia, Xuanwu Hospital of Capital Medical University, Beijing, 100053, China
| | - Tianlong Wang
- Department of Anesthesia, Xuanwu Hospital of Capital Medical University, Beijing, 100053, China
| | - Hui Wen
- Department of Anesthesia, Peking University International Hospital, No. 1, Life Garden Road, Zhongguancun Life Garden, Changping District, Beijing, China
| | - Lan Yao
- Department of Anesthesia, Peking University International Hospital, No. 1, Life Garden Road, Zhongguancun Life Garden, Changping District, Beijing, China.
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11
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Abstract
Regulated synthesis and movement of proteins between cellular organelles are central to diverse forms of biological adaptation and plasticity. In neurons, the repertoire of channel, receptor, and adhesion proteins displayed on the cell surface directly impacts cellular development, morphology, excitability, and synapse function. The immensity of the neuronal surface membrane and its division into distinct functional domains present a challenging landscape over which proteins must navigate to reach their appropriate functional domains. This problem becomes more complex considering that neuronal protein synthesis is continuously refined in space and time by neural activity. Here we review our current understanding of how integral membrane and secreted proteins important for neuronal function travel from their sites of synthesis to their functional destinations. We discuss how unique adaptations to the function and distribution of neuronal secretory organelles may facilitate local protein trafficking at remote sites in neuronal dendrites to support diverse forms of synaptic plasticity.
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Affiliation(s)
- Matthew J Kennedy
- Department of Pharmacology, University of Colorado School of Medicine, Aurora, Colorado 80045, USA;
| | - Cyril Hanus
- Institute for Psychiatry and Neurosciences of Paris, Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Paris, 75014 Paris, France;
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12
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Pakdel M, von Blume J. Exploring new routes for secretory protein export from the trans-Golgi network. Mol Biol Cell 2019; 29:235-240. [PMID: 29382805 PMCID: PMC5996961 DOI: 10.1091/mbc.e17-02-0117] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 11/30/2017] [Accepted: 12/01/2017] [Indexed: 12/21/2022] Open
Abstract
Sorting of soluble proteins for transport to intracellular compartments and for secretion from cells is essential for cell and tissue homeostasis. The trans-Golgi network (TGN) is a major sorting station that sorts secretory proteins into specific carriers to transport them to their final destinations. The sorting of lysosomal hydrolases at the TGN by the mannose 6-phosphate receptor is well understood. The recent discovery of a Ca2+-based sorting of secretory cargo at the TGN is beginning to uncover the mechanism by which cells sort secretory cargoes from Golgi residents and cargoes destined to the other cellular compartments. This Ca2+-based sorting involves the cytoplasmic actin cytoskeleton, which through membrane anchored Ca2+ ATPase SPCA1 and the luminal Ca2+ binding protein Cab45 sorts of a subset of secretory proteins at the TGN. We present this discovery and highlight important challenges that remain unaddressed in the overall pathway of cargo sorting at the TGN.
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Affiliation(s)
- Mehrshad Pakdel
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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13
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Fang Q, Zhang Y, Da P, Shao B, Pan H, He Z, Cheng C, Li D, Guo J, Wu X, Guan M, Liao M, Zhang Y, Sha S, Zhou Z, Wang J, Wang T, Su K, Chai R, Chen F. Deletion of Limk1 and Limk2 in mice does not alter cochlear development or auditory function. Sci Rep 2019; 9:3357. [PMID: 30833597 PMCID: PMC6399249 DOI: 10.1038/s41598-019-39769-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 11/06/2018] [Indexed: 12/12/2022] Open
Abstract
Inherited hearing loss is associated with gene mutations that result in sensory hair cell (HC) malfunction. HC structure is defined by the cytoskeleton, which is mainly composed of actin filaments and actin-binding partners. LIM motif-containing protein kinases (LIMKs) are the primary regulators of actin dynamics and consist of two members: LIMK1 and LIMK2. Actin arrangement is directly involved in the regulation of cytoskeletal structure and the maturation of synapses in the central nervous system, and LIMKs are involved in structural plasticity by controlling the activation of the actin depolymerization protein cofilin in the olfactory system and in the hippocampus. However, the expression pattern and the role of LIMKs in mouse cochlear development and synapse function also need to be further studied. We show here that the Limk genes are expressed in the mouse cochlea. We examined the morphology and the afferent synapse densities of HCs and measured the auditory function in Limk1 and Limk2 double knockout (DKO) mice. We found that the loss of Limk1 and Limk2 did not appear to affect the overall development of the cochlea, including the number of HCs and the structure of hair bundles. There were no significant differences in auditory thresholds between DKO mice and wild-type littermates. However, the expression of p-cofilin in the DKO mice was significantly decreased. Additionally, no significant differences were found in the number or distribution of ribbon synapses between the DKO and wild-type mice. In summary, our data suggest that the Limk genes play a different role in the development of the cochlea compared to their role in the central nervous system.
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Affiliation(s)
- Qiaojun Fang
- Department of Biomedical Engineering, Southern University of Science and Technology, 518000, Shenzhen, China.,Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China.,Department of Pathology and Laboratory Medicine, Medical University of South Carolina, 29425, Charleston, South Carolina, USA
| | - Yuhua Zhang
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Peng Da
- Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Nantong University, 226001, Nantong, China
| | - Buwei Shao
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Haolai Pan
- Department of Otolaryngology, Affiliated Sixth People's Hospital, Shanghai Jiao Tong University, 600 Yishan Road, 200233, Shanghai, China.,The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, 112008, Wenzhou, China
| | - Zuhong He
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China.,Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 430022, Wuhan, China
| | - Cheng Cheng
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Dan Li
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Jiaqi Guo
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Xiaohan Wu
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Ming Guan
- Department of Otolaryngology, Hangzhou First People's Hospital, 310006, Hangzhou, Zhejiang, China
| | - Menghui Liao
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Yuan Zhang
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Suhua Sha
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, 29425, Charleston, South Carolina, USA
| | - Zikai Zhou
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China
| | - Jian Wang
- Department of Otolaryngology, Affiliated Sixth People's Hospital, Shanghai Jiao Tong University, 600 Yishan Road, 200233, Shanghai, China.,School of Human Communication Disorders, Dalhousie University, B3J1Y6, Halifax, NS, Canada
| | - Tian Wang
- Department of Otolaryngology-Head and Neck Surgery, The second Xiangya Hospital, Central South University, 410011, Changsha, Hunan Province, China
| | - Kaiming Su
- Department of Otolaryngology, Affiliated Sixth People's Hospital, Shanghai Jiao Tong University, 600 Yishan Road, 200233, Shanghai, China.
| | - Renjie Chai
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, 210096, Nanjing, China. .,Jiangsu Province High-Tech Key Laboratory for Bio-Medical Research, Southeast University, 211189, Nanjing, China. .,Co-innovation Center of Neuroregeneration, Nantong University, 226001, Nantong, China. .,Institute for Stem Cell and Regeneration, Chinese Academy of Science, Beijing, China.
| | - Fangyi Chen
- Department of Biomedical Engineering, Southern University of Science and Technology, 518000, Shenzhen, China.
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14
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Bisbal M, Remedi M, Quassollo G, Cáceres A, Sanchez M. Rotenone inhibits axonogenesis via an Lfc/RhoA/
ROCK
pathway in cultured hippocampal neurons. J Neurochem 2018; 146:570-584. [DOI: 10.1111/jnc.14547] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 05/24/2018] [Accepted: 06/25/2018] [Indexed: 12/24/2022]
Affiliation(s)
- Mariano Bisbal
- Laboratory of Neurobiology INIMEC‐CONICET Córdoba Argentina
- Universidad Nacional de Córdoba Córdoba Argentina
- Instituto Universitario Ciencias Biomédicas Córdoba Córdoba Argentina
| | - Mónica Remedi
- Laboratory of Neurobiology INIMEC‐CONICET Córdoba Argentina
- Universidad Nacional de Córdoba Córdoba Argentina
- Instituto Universitario Ciencias Biomédicas Córdoba Córdoba Argentina
| | - Gonzalo Quassollo
- Laboratory of Neurobiology INIMEC‐CONICET Córdoba Argentina
- Universidad Nacional de Córdoba Córdoba Argentina
- Instituto Universitario Ciencias Biomédicas Córdoba Córdoba Argentina
| | - Alfredo Cáceres
- Laboratory of Neurobiology INIMEC‐CONICET Córdoba Argentina
- Universidad Nacional de Córdoba Córdoba Argentina
- Instituto Universitario Ciencias Biomédicas Córdoba Córdoba Argentina
| | - Mónica Sanchez
- Laboratory of Neurobiology INIMEC‐CONICET Córdoba Argentina
- Universidad Nacional de Córdoba Córdoba Argentina
- Instituto Universitario Ciencias Biomédicas Córdoba Córdoba Argentina
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15
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Collinson JM, Lindström NO, Neves C, Wallace K, Meharg C, Charles RH, Ross ZK, Fraser AM, Mbogo I, Oras K, Nakamoto M, Barker S, Duce S, Miedzybrodzka Z, Vargesson N. The developmental and genetic basis of 'clubfoot' in the peroneal muscular atrophy mutant mouse. Development 2018; 145:145/3/dev160093. [PMID: 29439133 DOI: 10.1242/dev.160093] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 12/28/2017] [Indexed: 12/19/2022]
Abstract
Genetic factors underlying the human limb abnormality congenital talipes equinovarus ('clubfoot') remain incompletely understood. The spontaneous autosomal recessive mouse 'peroneal muscular atrophy' mutant (PMA) is a faithful morphological model of human clubfoot. In PMA mice, the dorsal (peroneal) branches of the sciatic nerves are absent. In this study, the primary developmental defect was identified as a reduced growth of sciatic nerve lateral motor column (LMC) neurons leading to failure to project to dorsal (peroneal) lower limb muscle blocks. The pma mutation was mapped and a candidate gene encoding LIM-domain kinase 1 (Limk1) identified, which is upregulated in mutant lateral LMC motor neurons. Genetic and molecular analyses showed that the mutation acts in the EphA4-Limk1-Cfl1/cofilin-actin pathway to modulate growth cone extension/collapse. In the chicken, both experimental upregulation of Limk1 by electroporation and pharmacological inhibition of actin turnover led to defects in hindlimb spinal motor neuron growth and pathfinding, and mimicked the clubfoot phenotype. The data support a neuromuscular aetiology for clubfoot and provide a mechanistic framework to understand clubfoot in humans.
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Affiliation(s)
- J Martin Collinson
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Nils O Lindström
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Carlos Neves
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Karen Wallace
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Caroline Meharg
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Rebecca H Charles
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Zoe K Ross
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Amy M Fraser
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Ivan Mbogo
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Kadri Oras
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Masaru Nakamoto
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Simon Barker
- Royal Aberdeen Children's Hospital, Foresterhill, Aberdeen AB25 2ZN, UK
| | - Suzanne Duce
- School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK
| | - Zosia Miedzybrodzka
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Neil Vargesson
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD, UK
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16
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Ferrari ME, Bernis ME, McLeod F, Podpolny M, Coullery RP, Casadei IM, Salinas PC, Rosso SB. Wnt7b through Frizzled-7 receptor promotes dendrite development by coactivation of CaMKII and JNK. J Cell Sci 2018; 131:jcs.216101. [DOI: 10.1242/jcs.216101] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 05/29/2018] [Indexed: 01/26/2023] Open
Abstract
The formation of complex dendritic arbors is crucial for the assembly of functional networks as abnormal dendrite formation underlies several neurodevelopmental and psychiatric disorders. Many extracellular factors have been postulated as regulators of dendritic growth. Wnt proteins play a critical role in neuronal development and circuit formation. We previously demonstrated that Wnt7b acts through the scaffold protein Dishevelled (Dvl) to modulate dendrite arborization by activating a Wnt non-canonical signalling pathway. Here, we identify the seven-transmembrane Frizzled-7 (Fz7) as the receptor for Wnt7b-mediated dendrite growth and complexity. Importantly, Fz7 is developmentally regulated in the intact hippocampus localised along neurites and at dendritic growth cones, suggesting a role in dendrite formation and maturation. Fz7 loss of function studies demonstrated that Wnt7b requires Fz7 to promote dendritic arborisation. Moreover, in vivo Fz7 loss of function results in dendritic defects in the intact mouse hippocampus. Furthermore, our findings revealed that Wnt7b and Fz7 induce the phosphorylation of CaMKII and JNK, which are required for dendritic development. Here we demonstrate that Wnt7b-Fz7 signals through two Wnt non-canonical pathways to modulate dendritic growth and complexity.
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Affiliation(s)
- María E. Ferrari
- Laboratorio de Toxicología Experimental. Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - María E. Bernis
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET, Córdoba, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Faye McLeod
- Department of Cell and Developmental Biology, University College London, London, UK
| | - Marina Podpolny
- Department of Cell and Developmental Biology, University College London, London, UK
| | - Romina P. Coullery
- Laboratorio de Toxicología Experimental. Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Inelia M. Casadei
- Laboratorio de Toxicología Experimental. Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Patricia C. Salinas
- Department of Cell and Developmental Biology, University College London, London, UK
| | - Silvana B. Rosso
- Laboratorio de Toxicología Experimental. Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
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17
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Kashima R, Hata A. The role of TGF-β superfamily signaling in neurological disorders. Acta Biochim Biophys Sin (Shanghai) 2018; 50:106-120. [PMID: 29190314 PMCID: PMC5846707 DOI: 10.1093/abbs/gmx124] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/02/2017] [Indexed: 12/12/2022] Open
Abstract
The TGF-β superfamily signaling is involved in a variety of biological processes during embryogenesis and in adult tissue homeostasis. Faulty regulation of the signaling pathway that transduces the TGF-β superfamily signals accordingly leads to a number of ailments, such as cancer and cardiovascular, metabolic, urinary, intestinal, skeletal, and immune diseases. In recent years, a number of studies have elucidated the essential roles of TGF-βs and BMPs during neuronal development in the maintenance of appropriate innervation and neuronal activity. The new advancement implicates significant roles of the aberrant TGF-β superfamily signaling in the pathogenesis of neurological disorders. In this review, we compile a number of reports implicating the deregulation of TGF-β/BMP signaling pathways in the pathogenesis of cognitive and neurodegenerative disorders in animal models and patients. We apologize in advance that the review falls short of providing details of the role of TGF-β/BMP signaling or mechanisms underlying the pathogenesis of neurological disorders. The goal of this article is to reveal a gap in our knowledge regarding the association between TGF-β/BMP signaling pathways and neuronal tissue homeostasis and development and facilitate the research with a potential to develop new therapies for neurological ailments by modulating the pathways.
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Affiliation(s)
- Risa Kashima
- Cardiovascular Research Institute, University of California, San Francisco, CA 94143, USA
| | - Akiko Hata
- Cardiovascular Research Institute, University of California, San Francisco, CA 94143, USA
- Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143, USA
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18
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The functions of Reelin in membrane trafficking and cytoskeletal dynamics: implications for neuronal migration, polarization and differentiation. Biochem J 2017; 474:3137-3165. [PMID: 28887403 DOI: 10.1042/bcj20160628] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 07/27/2017] [Accepted: 08/01/2017] [Indexed: 02/06/2023]
Abstract
Reelin is a large extracellular matrix protein with relevant roles in mammalian central nervous system including neurogenesis, neuronal polarization and migration during development; and synaptic plasticity with its implications in learning and memory, in the adult. Dysfunctions in reelin signaling are associated with brain lamination defects such as lissencephaly, but also with neuropsychiatric diseases like autism, schizophrenia and depression as well with neurodegeneration. Reelin signaling involves a core pathway that activates upon reelin binding to its receptors, particularly ApoER2 (apolipoprotein E receptor 2)/LRP8 (low-density lipoprotein receptor-related protein 8) and very low-density lipoprotein receptor, followed by Src/Fyn-mediated phosphorylation of the adaptor protein Dab1 (Disabled-1). Phosphorylated Dab1 (pDab1) is a hub in the signaling cascade, from which several other downstream pathways diverge reflecting the different roles of reelin. Many of these pathways affect the dynamics of the actin and microtubular cytoskeleton, as well as membrane trafficking through the regulation of the activity of small GTPases, including the Rho and Rap families and molecules involved in cell polarity. The complexity of reelin functions is reflected by the fact that, even now, the precise mode of action of this signaling cascade in vivo at the cellular and molecular levels remains unclear. This review addresses and discusses in detail the participation of reelin in the processes underlying neurogenesis, neuronal migration in the cerebral cortex and the hippocampus; and the polarization, differentiation and maturation processes that neurons experiment in order to be functional in the adult brain. In vivo and in vitro evidence is presented in order to facilitate a better understanding of this fascinating system.
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19
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Xie J, Li X, Zhang W, Chai X, Huang Y, Li K, Cheng X, Zhao S. Aberrant expression of LIMK1 impairs neuronal migration during neocortex development. Histochem Cell Biol 2016; 147:471-479. [PMID: 27844143 DOI: 10.1007/s00418-016-1514-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/05/2016] [Indexed: 12/25/2022]
Abstract
Neuronal migration is essential for the formation of cortical layers, and proper neuronal migration requires the coordination of cytoskeletal regulation. LIMK1 is a serine/threonine protein kinase that mediates actin dynamics by regulating actin depolymerization factor/cofilin. However, the role of LIMK1 in neuronal migration and its potential mechanism remains elusive. Here, we found that using the in utero electroporation to overexpress LIMK1 and its mutants, constitutively active LIMK1 (LIMK1-CA) and dominant-negative LIMK1 (LIMK1-DN), impaired neuronal migration in the embryonic mouse brain. In addition, the aberrant expression of LIMK1-WT and LIMK1-CA induced abnormal branching and increased the length of the leading process, while LIMK1-DN-transfected neurons gave rise to two leading processes. Furthermore, the co-transfection of LIMK1-CA and cofilin-S3A partially rescued the migration deficiency and fully rescued the morphological changes in migrating neurons induced by LIMK1-CA. Our results indicated that LIMK1 negatively regulated neuronal migration by affecting the neuronal cytoskeleton and that its effects were partly mediated by cofilin phosphorylation.
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Affiliation(s)
- Jiongfang Xie
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Xuzhao Li
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Wei Zhang
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Xuejun Chai
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Yingxue Huang
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Kaikai Li
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Xinran Cheng
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Shanting Zhao
- College of Veterinary Medicine, Northwest A&F University, No.22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China.
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20
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Leshchyns'ka I, Sytnyk V. Intracellular transport and cell surface delivery of the neural cell adhesion molecule (NCAM). BIOARCHITECTURE 2016; 5:54-60. [PMID: 26605672 DOI: 10.1080/19490992.2015.1118194] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The neural cell adhesion molecule (NCAM) regulates differentiation and functioning of neurons by accumulating at the cell surface where it mediates the interactions of neurons with the extracellular environment. NCAM also induces a number of intracellular signaling cascades, which coordinate interactions at the cell surface with intracellular processes including changes in gene expression, transport and cytoskeleton remodeling. Since NCAM functions at the cell surface, its transport and delivery to the cell surface play a critical role. Here, we review recent advances in our understanding of the molecular mechanisms of the intracellular transport and cell surface delivery of NCAM. We also discuss the data suggesting a possibility of cross talk between activation of NCAM at the cell surface and the intracellular transport and cell surface delivery of NCAM.
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Affiliation(s)
- Iryna Leshchyns'ka
- a School of Biotechnology and Biomolecular Sciences ; The University of New South Wales ; Sydney , NSW , Australia
| | - Vladimir Sytnyk
- a School of Biotechnology and Biomolecular Sciences ; The University of New South Wales ; Sydney , NSW , Australia
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21
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Simvastatin Attenuates Neuropathic Pain by Inhibiting the RhoA/LIMK/Cofilin Pathway. Neurochem Res 2016; 41:2457-69. [PMID: 27216618 DOI: 10.1007/s11064-016-1958-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 04/26/2016] [Accepted: 05/12/2016] [Indexed: 12/21/2022]
Abstract
Neuropathic pain occurs due to deleterious changes in the nervous system caused by a lesion or dysfunction. Currently, neuropathic pain management is unsatisfactory and remains a challenge in clinical practice. Studies have suggested that actin cytoskeleton remodeling may be associated with neural plasticity and may involve a nociceptive mechanism. Here, we found that the RhoA/LIM kinase (LIMK)/cofilin pathway, which regulates actin dynamics, was activated after chronic constriction injury (CCI) of the sciatic nerve. Treatments that reduced RhoA/LIMK/cofilin pathway activity, including simvastatin, the Rho kinase inhibitor Y-27632, and the synthetic peptide Tat-S3, attenuated actin filament disruption in the dorsal root ganglion and CCI-induced neuropathic pain. Over-activation of the cytoskeleton caused by RhoA/LIMK/cofilin pathway activation may produce a scaffold for the trafficking of nociceptive signaling factors, leading to chronic neuropathic pain. Here, we found that simvastatin significantly decreased the ratio of membrane/cytosolic RhoA, which was significantly increased after CCI, by inhibiting the RhoA/LIMK/cofilin pathway. This effect was highly dependent on the function of the cytoskeleton as a scaffold for signal trafficking. We conclude that simvastatin attenuated neuropathic pain in rats subjected to CCI by inhibiting actin-mediated intracellular trafficking to suppress RhoA/LIMK/cofilin pathway activity.
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22
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Pérez-Núñez R, Barraza N, Gonzalez-Jamett A, Cárdenas AM, Barnier JV, Caviedes P. Overexpressed Down Syndrome Cell Adhesion Molecule (DSCAM) Deregulates P21-Activated Kinase (PAK) Activity in an In Vitro Neuronal Model of Down Syndrome: Consequences on Cell Process Formation and Extension. Neurotox Res 2016; 30:76-87. [PMID: 26966010 DOI: 10.1007/s12640-016-9613-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 01/12/2016] [Accepted: 02/26/2016] [Indexed: 10/22/2022]
Abstract
In humans, Down syndrome (DS) is caused by the presence of an extra copy of autosome 21. The most striking finding in DS patients is intellectual disability and the onset of Alzheimer's disease (AD)-like neuropathology in adulthood. Gene overdose is most likely to underlie both developmental impairments, as well as altered neuronal function in DS. Lately, the disruption of cellular signaling and regulatory pathways has been implicated in DS pathophysiology, and many of such pathways may represent common targets for diverse DS-related genes, which could in turn represent attractive therapeutical targets. In this regard, one DS-related gene Down Syndrome Cell Adhesion Molecule (DSCAM), has important functions in neuronal proliferation, maturation, and synaptogenesis. p21-associated kinases (PAKs) appear as a most interesting possibility for study, as DSCAM is known to regulate the PAKs pathway. Hence, in DS, overexpressed DSCAM could deregulate PAKs activity and affect signaling pathways that regulate synaptic plasticity such as dendritic spine dynamics and axon guidance and growth. In the present work, we used an immortalized cell line derived from the cerebral cortex of an animal model of DS such as the trisomy 16 (Ts16) fetal mouse (named CTb), and a similar cell line established from a normal littermate (named CNh), to study the effect of DSCAM in the PAKs pathway. The present study shows that DSCAM is overexpressed in CTb cells by approximately twofold, compared to CNh cells. Congruently, PAK1, as well as its downstream effectors LIMK and cofilin, stay phosphorylated for longer periods after DSCAM activation in the CTb cells, leading to an altered actin dynamics, expressed as an increased basal F/G ratio and reduced neurite growth, in the trisomic condition. The present work presents the correlation between DSCAM gene overexpression and a dysregulation of the PAK pathway, resulting in altered morphological parameters of neuronal plasticity in the trisomic cell line, namely decreased number and length of processes.
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Affiliation(s)
- Ramón Pérez-Núñez
- Program of Molecular & Clinical Pharmacology, ICBM, Faculty of Medicine, University of Chile, Independencia, 1027, Santiago, Chile
| | - Natalia Barraza
- Program of Molecular & Clinical Pharmacology, ICBM, Faculty of Medicine, University of Chile, Independencia, 1027, Santiago, Chile
| | | | | | - Jean-Vianney Barnier
- Neuroscience Paris-Saclay Institute, UMR 9197, CNRS-Université Paris-Sud, 91400, Orsay Cedex, France
| | - Pablo Caviedes
- Program of Molecular & Clinical Pharmacology, ICBM, Faculty of Medicine, University of Chile, Independencia, 1027, Santiago, Chile.
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23
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Coullery RP, Ferrari ME, Rosso SB. Neuronal development and axon growth are altered by glyphosate through a WNT non-canonical signaling pathway. Neurotoxicology 2016; 52:150-61. [PMID: 26688330 DOI: 10.1016/j.neuro.2015.12.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 12/04/2015] [Accepted: 12/04/2015] [Indexed: 01/25/2023]
Abstract
The growth and morphological differentiation of neurons are critical events in the establishment of proper neuronal connectivity and functioning. The developing nervous system is highly susceptible to damage caused by exposure to environmental contaminants. Glyphosate-containing herbicides are the most used agrochemicals in the world, particularly on genetically modified plants. Previous studies have demonstrated that glyphosate induces neurotoxicity in mammals. Therefore, its action mechanism on the nervous system needs to be determined. In this study, we report about impaired neuronal development caused by glyphosate exposure. Particularly, we observed that the initial axonal differentiation and growth of cultured neurons is affected by glyphosate since most treated cells remained undifferentiated after 1 day in culture. Although they polarized at 2 days in vitro, they elicited shorter and unbranched axons and they also developed less complex dendritic arbors compared to controls. To go further, we attempted to identify the cellular mechanism by which glyphosate affected neuronal morphology. Biochemical approaches revealed that glyphosate led to a decrease in Wnt5a level, a key factor for the initial neurite development and maturation, as well as inducing a down-regulation of CaMKII activity. This data suggests that the morphological defects would likely be a consequence of the decrease in both Wnt5a expression and CaMKII activity induced by glyphosate. Additionally, these changes might be reflected in a subsequent neuronal dysfunction. Therefore, our findings highlight the importance of establishing rigorous control on the use of glyphosate-based herbicides in order to protect mammals' health.
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Affiliation(s)
- Romina P Coullery
- Experimental Toxicology Laboratory, School of Biochemical and Pharmaceutical Sciences, National University of Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | - María E Ferrari
- Experimental Toxicology Laboratory, School of Biochemical and Pharmaceutical Sciences, National University of Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | - Silvana B Rosso
- Experimental Toxicology Laboratory, School of Biochemical and Pharmaceutical Sciences, National University of Rosario, Suipacha 531, S2002LRK Rosario, Argentina.
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24
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Cuberos H, Vallée B, Vourc'h P, Tastet J, Andres CR, Bénédetti H. Roles of LIM kinases in central nervous system function and dysfunction. FEBS Lett 2015; 589:3795-806. [PMID: 26545494 DOI: 10.1016/j.febslet.2015.10.032] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 10/21/2015] [Accepted: 10/28/2015] [Indexed: 12/30/2022]
Abstract
LIM kinase 1 (LIMK1) and LIM kinase 2 (LIMK2) regulate actin dynamics by phosphorylating cofilin. In this review, we outline studies that have shown an involvement of LIMKs in neuronal function and we detail some of the pathways and molecular mechanisms involving LIMKs in neurodevelopment and synaptic plasticity. We also review the involvement of LIMKs in neuronal diseases and emphasize the differences in the regulation of LIMKs expression and mode of action. We finally present the existence of a cofilin-independent pathway also involved in neuronal function. A better understanding of the differences between both LIMKs and of the precise molecular mechanisms involved in their mode of action and regulation is now required to improve our understanding of the physiopathology of the neuronal diseases associated with LIMKs.
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Affiliation(s)
- H Cuberos
- CNRS UPR 4301, CBM, Orléans, France; UMR INSERM U930, Université François-Rabelais, Tours, France
| | - B Vallée
- CNRS UPR 4301, CBM, Orléans, France
| | - P Vourc'h
- UMR INSERM U930, Université François-Rabelais, Tours, France; CHRU de Tours, Service de Biochimie et de Biologie Moléculaire, Tours, France
| | - J Tastet
- University Medical Center Utrecht, Brain Center Rudolf Magnus, Utrecht, Netherlands
| | - C R Andres
- UMR INSERM U930, Université François-Rabelais, Tours, France; CHRU de Tours, Service de Biochimie et de Biologie Moléculaire, Tours, France
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25
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Arias CI, Siri SO, Conde C. Involvement of SARA in Axon and Dendrite Growth. PLoS One 2015; 10:e0138792. [PMID: 26405814 PMCID: PMC4583221 DOI: 10.1371/journal.pone.0138792] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 09/03/2015] [Indexed: 11/19/2022] Open
Abstract
SARA (Smad Anchor for Receptor Activation) plays a crucial role in Rab5-mediated endocytosis in cell lines localizing to early endosomes where it regulates morphology and function. Here, we analyzed the role of SARA during neuronal development and tested whether it functions as a regulator of endocytic trafficking of selected axonal and membrane proteins. Suppression of SARA perturbs the appearance of juxtanuclear endocytic recycling compartments and the neurons show long axons with large growth cones. Furthermore, surface distribution of the cell adhesion molecule L1 in axons and the fusion of vesicles containing transferring receptor (TfR) in dendrites were increased in neurons where SARA was silenced. Conversely, SARA overexpression generated large early endosomes and reduced neurite outgrowth. Taken together, our findings suggest a significant contribution of SARA to key aspects of neuronal development, including neurite formation.
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Affiliation(s)
| | - Sebastián Omar Siri
- Laboratorio Neurobiología, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto Universitario de Ciencias Biomédicas de Córdoba, Córdoba, Argentina
| | - Cecilia Conde
- Laboratorio Neurobiología, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto Universitario de Ciencias Biomédicas de Córdoba, Córdoba, Argentina
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26
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Grassi D, Plonka FB, Oksdath M, Guil AN, Sosa LJ, Quiroga S. Selected SNARE proteins are essential for the polarized membrane insertion of igf-1 receptor and the regulation of initial axonal outgrowth in neurons. Cell Discov 2015; 1:15023. [PMID: 27462422 PMCID: PMC4860833 DOI: 10.1038/celldisc.2015.23] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 07/07/2015] [Indexed: 02/08/2023] Open
Abstract
The establishment of polarity necessitates initial axonal outgrowth and,
therefore, the addition of new membrane to the axon’s plasmalemma.
Axolemmal expansion occurs by exocytosis of plasmalemmal precursor vesicles
(PPVs) primarily at the neuronal growth cone. Little is known about the SNAREs
family proteins involved in the regulation of PPV fusion with the neuronal
plasmalemma at early stages of differentiation. We show here that five SNARE
proteins (VAMP2, VAMP4, VAMP7, Syntaxin6 and SNAP23) were expressed by
hippocampal pyramidal neurons before polarization. Expression silencing of three
of these proteins (VAMP4, Syntaxin6 and SNAP23) repressed axonal outgrowth and
the establishment of neuronal polarity, by inhibiting IGF-1 receptor exocytotic
polarized insertion, necessary for neuronal polarization. In addition,
stimulation with IGF-1 triggered the association of VAMP4, Syntaxin6 and SNAP23
to vesicular structures carrying the IGF-1 receptor and overexpression of a
negative dominant form of Syntaxin6 significantly inhibited exocytosis of IGF-1
receptor containing vesicles at the neuronal growth cone. Taken together, our
results indicated that VAMP4, Syntaxin6 and SNAP23 functions are essential for
regulation of PPV exocytosis and the polarized insertion of IGF-1 receptor and,
therefore, required for initial axonal elongation and the establishment of
neuronal polarity.
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Affiliation(s)
- Diego Grassi
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET , Córdoba, Argentina
| | - Florentyna Bustos Plonka
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET , Córdoba, Argentina
| | - Mariana Oksdath
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET , Córdoba, Argentina
| | - Alvaro Nieto Guil
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET , Córdoba, Argentina
| | - Lucas J Sosa
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET , Córdoba, Argentina
| | - Santiago Quiroga
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET , Córdoba, Argentina
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27
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George J, Soares C, Montersino A, Beique JC, Thomas GM. Palmitoylation of LIM Kinase-1 ensures spine-specific actin polymerization and morphological plasticity. eLife 2015; 4:e06327. [PMID: 25884247 PMCID: PMC4429338 DOI: 10.7554/elife.06327] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Accepted: 04/16/2015] [Indexed: 12/04/2022] Open
Abstract
Precise regulation of the dendritic spine actin cytoskeleton is critical for neurodevelopment and neuronal plasticity, but how neurons spatially control actin dynamics is not well defined. Here, we identify direct palmitoylation of the actin regulator LIM kinase-1 (LIMK1) as a novel mechanism to control spine-specific actin dynamics. A conserved palmitoyl-motif is necessary and sufficient to target LIMK1 to spines and to anchor LIMK1 in spines. ShRNA knockdown/rescue experiments reveal that LIMK1 palmitoylation is essential for normal spine actin polymerization, for spine-specific structural plasticity and for long-term spine stability. Palmitoylation is critical for LIMK1 function because this modification not only controls LIMK1 targeting, but is also essential for LIMK1 activation by its membrane-localized upstream activator PAK. These novel roles for palmitoylation in the spatial control of actin dynamics and kinase signaling provide new insights into structural plasticity mechanisms and strengthen links between dendritic spine impairments and neuropathological conditions. DOI:http://dx.doi.org/10.7554/eLife.06327.001 Neurons transmit information from one cell to the next by passing signals across junctions called synapses. For the neurons that receive these signals, these junctions are found on fine branch-like structures called dendrites that stick out of the cell. Dendrites themselves are decorated with smaller structures called dendritic spines, which typically receive information from one other neuron via a single synapse. Dendritic spines form in response to the signaling activity of the neuron, and problems with forming these spines have been linked to conditions such as autism and schizophrenia. Dendritic spines are created by the cell's cytoskeleton—a network of proteins that creates a constantly changing internal scaffold that shapes cells. One cytoskeleton protein called actin exists as thin filaments that can be extended or broken up by other proteins. It is not fully understood how actin is regulated in the dendritic spines. However, some researchers thought that the proteins that control the formation of the actin filaments would need to be localized to the dendritic spines to ensure that the spines form correctly. Some proteins can be made to localize to cell membranes by attaching a molecule called palmitic acid to them. Previous research has suggested that this ‘palmitoylation’ process is particularly important in neurons. Through a combination of experimental techniques, George et al. now show that palmitoylation is required to localize a protein called LIMK1, which regulates the construction of actin filaments, to the tips of dendritic spines. Further experiments showed that blocking the palmitoylation of LIMK1 alters how actin filaments form, makes spines unstable and causes synapses to be lost. George et al. also discovered that palmitoylation is necessary for LIMK1 to be activated by another protein that is found at dendritic spine membranes. This ‘dual-control’ mechanism makes it possible to precisely control where actin filaments form within dendritic spines. In addition to LIMK1, several other enzymes are also modified by palmitoylation. It will therefore be interesting to determine whether this dual control mechanism is broadly used by neurons to precisely regulate the structure and function of individual spines and synapses. DOI:http://dx.doi.org/10.7554/eLife.06327.002
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Affiliation(s)
- Joju George
- Shriners Hospitals Pediatric Research Center, Temple University School of Medicine, Philadelphia, United States
| | - Cary Soares
- Heart and Stroke Partnership for Stroke Recovery, University of Ottawa, Ottawa, Canada
| | - Audrey Montersino
- Shriners Hospitals Pediatric Research Center, Temple University School of Medicine, Philadelphia, United States
| | - Jean-Claude Beique
- Heart and Stroke Partnership for Stroke Recovery, University of Ottawa, Ottawa, Canada
| | - Gareth M Thomas
- Shriners Hospitals Pediatric Research Center, Temple University School of Medicine, Philadelphia, United States
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28
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Quassollo G, Wojnacki J, Salas DA, Gastaldi L, Marzolo MP, Conde C, Bisbal M, Couve A, Cáceres A. A RhoA Signaling Pathway Regulates Dendritic Golgi Outpost Formation. Curr Biol 2015; 25:971-82. [PMID: 25802147 DOI: 10.1016/j.cub.2015.01.075] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 12/02/2014] [Accepted: 01/30/2015] [Indexed: 12/30/2022]
Abstract
The neuronal Golgi apparatus (GA) localizes to the perinuclear region and dendrites as tubulo-vesicular structures designated Golgi outposts (GOPs). Current evidence suggests that GOPs shape dendrite morphology and serve as platforms for the local delivery of synaptic receptors. However, the mechanisms underlying GOP formation remain a mystery. Using live-cell imaging and confocal microscopy in cultured hippocampal neurons, we now show that GOPs destined to major "apical" dendrites are generated from the somatic GA by a sequence of events involving: (1) generation of a GA-derived tubule; (2) tubule elongation and deployment into the dendrite; (3) tubule fission; and (4) transport and condensation of the fissioned tubule. A RhoA-Rock signaling pathway involving LIMK1, PKD1, slingshot, cofilin, and dynamin regulates polarized GOP formation by controlling the tubule fission. Our observations identify a mechanism underlying polarized GOP biogenesis and provide new insights regarding involvement of RhoA in dendritic development and polarization.
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Affiliation(s)
- Gonzalo Quassollo
- Laboratorio Neurobiología, INIMEC-CONICET, Av. Friuli 2434, 5016 Córdoba, Argentina; Universidad Nacional de Córdoba, Av. Haya de la Torre s/n, 5000 Córdoba, Argentina
| | - Jose Wojnacki
- Laboratorio Neurobiología, INIMEC-CONICET, Av. Friuli 2434, 5016 Córdoba, Argentina; Universidad Nacional de Córdoba, Av. Haya de la Torre s/n, 5000 Córdoba, Argentina
| | - Daniela A Salas
- Programa de Fisiología y Biofísica, Instituto de Ciencias Biomédicas, Biomedical Neuroscience Institute, Facultad de Medicina, Universidad de Chile, Independencia 1027, 8380453 Santiago, Chile
| | - Laura Gastaldi
- Laboratorio Neurobiología, INIMEC-CONICET, Av. Friuli 2434, 5016 Córdoba, Argentina; Universidad Nacional de Córdoba, Av. Haya de la Torre s/n, 5000 Córdoba, Argentina
| | - María Paz Marzolo
- Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Avda. Libertador Bernardo OHiggins 340, 8331010 Santiago, Chile
| | - Cecilia Conde
- Laboratorio Neurobiología, INIMEC-CONICET, Av. Friuli 2434, 5016 Córdoba, Argentina; Universidad Nacional de Córdoba, Av. Haya de la Torre s/n, 5000 Córdoba, Argentina; Instituto Universitario Ciencias Biomédicas Córdoba, Av. Friuli 2786, 5016 Córdoba, Argentina
| | - Mariano Bisbal
- Laboratorio Neurobiología, INIMEC-CONICET, Av. Friuli 2434, 5016 Córdoba, Argentina; Universidad Nacional de Córdoba, Av. Haya de la Torre s/n, 5000 Córdoba, Argentina; Instituto Universitario Ciencias Biomédicas Córdoba, Av. Friuli 2786, 5016 Córdoba, Argentina
| | - Andrés Couve
- Programa de Fisiología y Biofísica, Instituto de Ciencias Biomédicas, Biomedical Neuroscience Institute, Facultad de Medicina, Universidad de Chile, Independencia 1027, 8380453 Santiago, Chile
| | - Alfredo Cáceres
- Laboratorio Neurobiología, INIMEC-CONICET, Av. Friuli 2434, 5016 Córdoba, Argentina; Universidad Nacional de Córdoba, Av. Haya de la Torre s/n, 5000 Córdoba, Argentina; Instituto Universitario Ciencias Biomédicas Córdoba, Av. Friuli 2786, 5016 Córdoba, Argentina.
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29
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Kienzle C, Basnet N, Crevenna AH, Beck G, Habermann B, Mizuno N, von Blume J. Cofilin recruits F-actin to SPCA1 and promotes Ca2+-mediated secretory cargo sorting. ACTA ACUST UNITED AC 2014; 206:635-54. [PMID: 25179631 PMCID: PMC4151145 DOI: 10.1083/jcb.201311052] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The cofilin CFL-1 recruits actin to the P-type calcium ATPase SPCA1 at the trans-Golgi network, thereby activating the ATPase, promoting Ca2+ influx, and driving secretory cargo sorting. The actin filament severing protein cofilin-1 (CFL-1) is required for actin and P-type ATPase secretory pathway calcium ATPase (SPCA)-dependent sorting of secretory proteins at the trans-Golgi network (TGN). How these proteins interact and activate the pump to facilitate cargo sorting, however, is not known. We used purified proteins to assess interaction of the cytoplasmic domains of SPCA1 with actin and CFL-1. A 132–amino acid portion of the SPCA1 phosphorylation domain (P-domain) interacted with actin in a CFL-1–dependent manner. This domain, coupled to nickel nitrilotriacetic acid (Ni-NTA) agarose beads, specifically recruited F-actin in the presence of CFL-1 and, when expressed in HeLa cells, inhibited Ca2+ entry into the TGN and secretory cargo sorting. Mutagenesis of four amino acids in SPCA1 that represent the CFL-1 binding site also affected Ca2+ import into the TGN and secretory cargo sorting. Altogether, our findings reveal the mechanism of CFL-1–dependent recruitment of actin to SPCA1 and the significance of this interaction for Ca2+ influx and secretory cargo sorting.
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Affiliation(s)
| | - Nirakar Basnet
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Alvaro H Crevenna
- Physical Chemistry, Department of Chemistry and Biochemistry and Center for NanoScience (CeNS), Ludwig Maximilians University of Munich, 81377 Munich, Germany
| | - Gisela Beck
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Bianca Habermann
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Naoko Mizuno
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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30
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Kannan R, Kuzina I, Wincovitch S, Nowotarski SH, Giniger E. The Abl/enabled signaling pathway regulates Golgi architecture in Drosophila photoreceptor neurons. Mol Biol Cell 2014; 25:2993-3005. [PMID: 25103244 PMCID: PMC4230588 DOI: 10.1091/mbc.e14-02-0729] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 06/04/2014] [Accepted: 07/29/2014] [Indexed: 11/24/2022] Open
Abstract
The Golgi apparatus is optimized separately in different tissues for efficient protein trafficking, but we know little of how cell signaling shapes this organelle. We now find that the Abl tyrosine kinase signaling pathway controls the architecture of the Golgi complex in Drosophila photoreceptor (PR) neurons. The Abl effector, Enabled (Ena), selectively labels the cis-Golgi in developing PRs. Overexpression or loss of function of Ena increases the number of cis- and trans-Golgi cisternae per cell, and Ena overexpression also redistributes Golgi to the most basal portion of the cell soma. Loss of Abl or its upstream regulator, the adaptor protein Disabled, lead to the same alterations of Golgi as does overexpression of Ena. The increase in Golgi number in Abl mutants arises in part from increased frequency of Golgi fission events and a decrease in fusions, as revealed by live imaging. Finally, we demonstrate that the effects of Abl signaling on Golgi are mediated via regulation of the actin cytoskeleton. Together, these data reveal a direct link between cell signaling and Golgi architecture. Moreover, they raise the possibility that some of the effects of Abl signaling may arise, in part, from alterations of protein trafficking and secretion.
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Affiliation(s)
- Ramakrishnan Kannan
- Axon Guidance and Neural Connectivity Unit, Basic Neuroscience Program, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892
| | - Irina Kuzina
- Axon Guidance and Neural Connectivity Unit, Basic Neuroscience Program, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892
| | - Stephen Wincovitch
- Cytogenetics and Microscopy Core, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892
| | - Stephanie H Nowotarski
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Edward Giniger
- Axon Guidance and Neural Connectivity Unit, Basic Neuroscience Program, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892
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31
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Fraire JC, Masseroni ML, Jausoro I, Perassi EM, Diaz Añel AM, Coronado EA. Identification, localization, and quantification of neuronal cell membrane receptors with plasmonic probes: role of protein kinase D1 in their distribution. ACS NANO 2014; 8:8942-58. [PMID: 25137054 DOI: 10.1021/nn501575c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Detecting, imaging, and being able to localize the distribution of several cell membrane receptors on a single neuron are very important topics in neuroscience research. In the present work, the distribution of metabotropic glutamate receptor 1a (mGluR1a) density on neuron cells on subcellular length scales is determined by evaluating the role played by protein kinase D1 (PKD1) in the trafficking of membrane proteins, comparing the distribution of mGluR1a in experiments performed in endogenous PKD1 expression with those in the presence of kinase-inactive protein kinase D1 (PKD1-kd). The localization, distribution, and density of cell surface mGluR1a were evaluated using 90 nm diameter Au nanoparticle (NP) probes specifically functionalized with a high-affinity and multivalent labeling function, which allows not only imaging NPs where this receptor is present but also quantifying by optical means the NP density. This is so because the NP generates a density (ρ)-dependent SERS response that facilitated a spatial mapping of the mGluR1a density distribution on subcellular length scales (dendrites and axons) in an optical microscope. The measured ρ values were found to be significantly higher on dendrites than on axons for endogenous PKD1, while an increase of ρ on axons was observed when PKD1 is altered. The spatial distribution of the NP immunolabels through scanning electron microscopy (SEM) confirmed the results obtained by fluorescence bright-field analysis and dark-field spectroscopy and provided additional structural details. In addition, it is shown using electrodynamic simulations that SERS spectroscopy could be a very sensitive tool for the spatial mapping of cell membrane receptors on subcellular length scales, as SERS signals are almost linearly dependent on NP density and therefore give indirect information on the distribution of cell membrane proteins. This result is important since the calibration of the ρ-dependent near-field enhancement of the Au immunolabels through correlation of SERS and SEM paves the way toward quantitative immunolabeling studies of cell membrane proteins involved in neuron polarity. From the molecular biology point of view, this study shows that in cultured hippocampal pyramidal cells mGluR1a is predominantly transported to dendrites and excluded from axons. Expression of kinase-inactive protein kinase D1 (PKD1-kd) dramatically and selectively alters the intracellular trafficking and membrane delivery of mGluR1a-containing vesicles.
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Affiliation(s)
- Juan C Fraire
- INFIQC, Centro Laser de Ciencias Moleculares, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, and ‡INIMEC, Laboratorio de Neurobiología, Universidad Nacional de Córdoba , Córdoba, 5000, Argentina
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32
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Aurora A kinase modulates actin cytoskeleton through phosphorylation of Cofilin: Implication in the mitotic process. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:2719-29. [PMID: 25090971 DOI: 10.1016/j.bbamcr.2014.07.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2014] [Revised: 07/24/2014] [Accepted: 07/25/2014] [Indexed: 11/22/2022]
Abstract
Aurora A kinase regulates early mitotic events through phosphorylation and activation of a variety of proteins. Specifically, Aur-A is involved in centrosomal separation and formation of mitotic spindles in early prophase. The effect of Aur-A on mitotic spindles is mediated by the modulation of microtubule dynamics and association with microtubule binding proteins. In this study we show that Aur-A exerts its effects on spindle organization through the regulation of the actin cytoskeleton. Aurora A phosphorylates Cofilin at multiple sites including S(3) resulting in the inactivation of its actin depolymerizing function. Aur-A interacts with Cofilin in early mitotic phases and regulates its phosphorylation status. Cofilin phosphorylation follows a dynamic pattern during the progression of prophase to metaphase. Inhibition of Aur-A activity induced a delay in the progression of prophase to metaphase. Aur-A inhibitor also disturbed the pattern of Cofilin phosphorylation, which correlated with the mitotic delay. Our results establish a novel function of Aur-A in the regulation of actin cytoskeleton reorganization, through Cofilin phosphorylation during early mitotic stages.
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33
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Van Battum EY, Gunput RAF, Lemstra S, Groen EJN, Yu KL, Adolfs Y, Zhou Y, Hoogenraad CC, Yoshida Y, Schachner M, Akhmanova A, Pasterkamp RJ. The intracellular redox protein MICAL-1 regulates the development of hippocampal mossy fibre connections. Nat Commun 2014; 5:4317. [PMID: 25007825 DOI: 10.1038/ncomms5317] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 06/05/2014] [Indexed: 02/05/2023] Open
Abstract
Mical is a reduction-oxidation (redox) enzyme that functions as an unusual F-actin disassembly factor during Drosophila development. Although three Molecule interacting with CasL (MICAL) proteins exist in vertebrate species, their mechanism of action remains poorly defined and their role in vivo unknown. Here, we report that vertebrate MICAL-1 regulates the targeting of secretory vesicles containing immunoglobulin superfamily cell adhesion molecules (IgCAMs) to the neuronal growth cone membrane through its ability to control the actin cytoskeleton using redox chemistry, thereby maintaining appropriate IgCAM cell surface levels. This precise regulation of IgCAMs by MICAL-1 is essential for the lamina-specific targeting of mossy fibre axons onto CA3 pyramidal neurons in the developing mouse hippocampus in vivo. These findings reveal the first in vivo role for a vertebrate MICAL protein, expand the repertoire of cellular functions controlled through MICAL-mediated effects on the cytoskeleton, and provide insights into the poorly characterized mechanisms underlying neuronal protein cell surface expression and lamina-specific axonal targeting.
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Affiliation(s)
- Eljo Y Van Battum
- 1] Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands [2]
| | - Rou-Afza F Gunput
- 1] Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands [2] [3]
| | - Suzanne Lemstra
- Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands
| | - Ewout J N Groen
- 1] Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands [2] Department of Neurology and Neurosurgery, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3508 GA, Utrecht, The Netherlands
| | - Ka Lou Yu
- Cell Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Youri Adolfs
- Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands
| | - Yeping Zhou
- 1] Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands [2]
| | - Casper C Hoogenraad
- Cell Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Yukata Yoshida
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA
| | - Melitta Schachner
- Center for Neuroscience, Shantou University Medical College, Shantou, Guangdong 515041, China
| | - Anna Akhmanova
- Cell Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - R Jeroen Pasterkamp
- Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3584 CG Utrecht, The Netherlands
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Zhang Y, Hu H, Tian T, Zhang L, Zhao D, Wu Q, Chang Y, Wang Q, Zhou S, Feng G, Huang F. Mst3b promotes spinal cord neuronal regeneration by promoting growth cone branching out in spinal cord injury rats. Mol Neurobiol 2014; 51:1144-57. [PMID: 24990316 DOI: 10.1007/s12035-014-8785-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 06/09/2014] [Indexed: 01/05/2023]
Abstract
Spinal cord injury is a severe clinical problem, and research searching activity molecular that can promote spinal cord injury repairing is very prevalent. Mst3b can promote repair of damaged peripheral nerves and the optic nerve, but has been rarely reported in spinal cord injury research. Through detecting its expression in different periods of injured spinal cord, we found that the expression of Mst3b was significantly upregulated in injured spinal cord neurons. Increasing Mst3b expression using adenovirus in vivo and in vitro promoted axonal regeneration of spinal cord neurons, which led to behavioral and electrophysiological improvement. Downregulation of Mst3b level had the adverse effects. Increasing Mst3b expression in PC12 cells resulted in an elevation of P42/44(MAPK) and LIMK/Cofilin activation. These results identified Mst3b as a powerful regulator for promoting spinal cord injury recovery through the P42/44(MAPK) and LIMK/Cofilin signaling pathways.
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Affiliation(s)
- Yuqiang Zhang
- Institute of Human Anatomy and Histology and Embryology, Otology & Neuroscience Center, Binzhou Medical University, 346 Guanhai Road, Laishan, Shandong Province, 264003, China
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Li Y, Hu F, Chen HJ, Du YJ, Xie ZY, Zhang Y, Wang J, Wang Y. LIMK-Dependent Actin Polymerization in Primary Sensory Neurons Promotes the Development of Inflammatory Heat Hyperalgesia in Rats. Sci Signal 2014; 7. [DOI: 10.1126/scisignal.2005353] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
Inflammation-induced sensitivity to pain could be reduced by disrupting the actin cytoskeleton in primary sensory neurons.
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Affiliation(s)
- Yi Li
- Neuroscience Research Institute and Department of Neurobiology, Key Laboratory for Neuroscience of Ministry of Education and Health, School of Basic Medical Sciences, Peking University, Beijing 100191, China
| | - Fang Hu
- Neuroscience Research Institute and Department of Neurobiology, Key Laboratory for Neuroscience of Ministry of Education and Health, School of Basic Medical Sciences, Peking University, Beijing 100191, China
| | - Hai-Jing Chen
- Neuroscience Research Institute and Department of Neurobiology, Key Laboratory for Neuroscience of Ministry of Education and Health, School of Basic Medical Sciences, Peking University, Beijing 100191, China
| | - Yi-Juan Du
- Neuroscience Research Institute and Department of Neurobiology, Key Laboratory for Neuroscience of Ministry of Education and Health, School of Basic Medical Sciences, Peking University, Beijing 100191, China
| | - Zhi-Ying Xie
- Beijing Huijia Private School, Beijing 102200, China
| | - Ying Zhang
- Neuroscience Research Institute and Department of Neurobiology, Key Laboratory for Neuroscience of Ministry of Education and Health, School of Basic Medical Sciences, Peking University, Beijing 100191, China
| | - Jun Wang
- Department of Anatomy and Histology, School of Basic Medical Sciences, Peking University, Beijing 100191, China
| | - Yun Wang
- Neuroscience Research Institute and Department of Neurobiology, Key Laboratory for Neuroscience of Ministry of Education and Health, School of Basic Medical Sciences, Peking University, Beijing 100191, China
- PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing 100871, China
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Berto GE, Iobbi C, Camera P, Scarpa E, Iampietro C, Bianchi F, Gai M, Sgrò F, Cristofani F, Gärtner A, Dotti CG, Di Cunto F. The DCR protein TTC3 affects differentiation and Golgi compactness in neurons through specific actin-regulating pathways. PLoS One 2014; 9:e93721. [PMID: 24695496 PMCID: PMC3973554 DOI: 10.1371/journal.pone.0093721] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 03/06/2014] [Indexed: 01/10/2023] Open
Abstract
In neuronal cells, actin remodeling plays a well known role in neurite extension but is also deeply involved in the organization of intracellular structures, such as the Golgi apparatus. However, it is still not very clear which mechanisms may regulate actin dynamics at the different sites. In this report we show that high levels of the TTC3 protein, encoded by one of the genes of the Down Syndrome Critical Region (DCR), prevent neurite extension and disrupt Golgi compactness in differentiating primary neurons. These effects largely depend on the capability of TTC3 to promote actin polymerization through signaling pathways involving RhoA, ROCK, CIT-N and PIIa. However, the functional relationships between these molecules differ significantly if considering the TTC3 activity on neurite extension or on Golgi organization. Finally, our results reveal an unexpected stage-dependent requirement for F-actin in Golgi organization at different stages of neuronal differentiation.
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Affiliation(s)
- Gaia Elena Berto
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
- * E-mail: (GEB); (FDC)
| | - Cristina Iobbi
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Paola Camera
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Elena Scarpa
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Corinne Iampietro
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Federico Bianchi
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Marta Gai
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Francesco Sgrò
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Flavio Cristofani
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Annette Gärtner
- VIB Center for the Biology of Disease – VIB, Leuven, Belgium
| | - Carlos G. Dotti
- VIB Center for the Biology of Disease – VIB, Leuven, Belgium
- Centro de Biología Molecular Severo Ochoa, CSIC/UAM, Madrid, Spain
| | - Ferdinando Di Cunto
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
- * E-mail: (GEB); (FDC)
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Petrosyan A, Cheng PW. Golgi fragmentation induced by heat shock or inhibition of heat shock proteins is mediated by non-muscle myosin IIA via its interaction with glycosyltransferases. Cell Stress Chaperones 2014; 19:241-54. [PMID: 23990450 PMCID: PMC3933620 DOI: 10.1007/s12192-013-0450-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 07/23/2013] [Accepted: 07/24/2013] [Indexed: 01/12/2023] Open
Abstract
The Golgi apparatus is a highly dynamic organelle which frequently undergoes morphological changes in certain normal physiological processes or in response to stress. The mechanisms are largely not known. We have found that heat shock of Panc1 cells expressing core 2 N-acetylglucosaminyltransferase-M (Panc1-C2GnT-M) induces Golgi disorganization by increasing non-muscle myosin IIA (NMIIA)-C2GnT-M complexes and polyubiquitination and proteasomal degradation of C2GnT-M. These effects are prevented by inhibition or knockdown of NMIIA. Also, the speed of Golgi fragmentation induced by heat shock is found to be positively correlated with the levels of C2GnT-M in the Golgi. The results are reproduced in LNCaP cells expressing high levels of two endogenous glycosyltransferases-core 2 N-acetylglucosaminyltransferase-L:1 and β-galactoside:α2-3 sialyltransferase 1. Further, during recovery after heat shock, Golgi reassembly as monitored by a Golgi matrix protein giantin precedes the return of C2GnT-M to the Golgi. The results are consistent with the roles of giantin as a building block of the Golgi architecture and a docking site for transport vesicles carrying glycosyltransferases. In addition, inhibition/depletion of HSP70 or HSP90 in Panc1-C2GnT-M cells also causes an increase of NMIIA-C2GnT-M complexes and NMIIA-mediated Golgi fragmentation but results in accumulation or degradation of C2GnT-M, respectively. These results can be explained by the known functions of these two HSP: participation of HSP90 in protein folding and HSP70 in protein folding and degradation. We conclude that NMIIA is the master regulator of Golgi fragmentation induced by heat shock or inhibition/depletion of HSP70/90.
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Affiliation(s)
- Armen Petrosyan
- />Department of Research Service, Veterans Administration Nebraska-Western Iowa Health Care System, Omaha, NE USA
- />Department of Biochemistry and Molecular Biology, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198-5870 USA
| | - Pi-Wan Cheng
- />Department of Research Service, Veterans Administration Nebraska-Western Iowa Health Care System, Omaha, NE USA
- />Department of Biochemistry and Molecular Biology, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198-5870 USA
- />Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE USA
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Gudheti MV, Curthoys NM, Gould TJ, Kim D, Gunewardene MS, Gabor KA, Gosse JA, Kim CH, Zimmerberg J, Hess ST. Actin mediates the nanoscale membrane organization of the clustered membrane protein influenza hemagglutinin. Biophys J 2013; 104:2182-92. [PMID: 23708358 DOI: 10.1016/j.bpj.2013.03.054] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 03/15/2013] [Accepted: 03/20/2013] [Indexed: 12/22/2022] Open
Abstract
The influenza viral membrane protein hemagglutinin (HA) is required at high concentrations on virion and host-cell membranes for infectivity. Because the role of actin in membrane organization is not completely understood, we quantified the relationship between HA and host-cell actin at the nanoscale. Results obtained using superresolution fluorescence photoactivation localization microscopy (FPALM) in nonpolarized cells show that HA clusters colocalize with actin-rich membrane regions (ARMRs). Individual molecular trajectories in live cells indicate restricted HA mobility in ARMRs, and actin disruption caused specific changes to HA clustering. Surprisingly, the actin-binding protein cofilin was excluded from some regions within several hundred nanometers of HA clusters, suggesting that HA clusters or adjacent proteins within the same clusters influence local actin structure. Thus, with the use of imaging, we demonstrate a dynamic relationship between glycoprotein membrane organization and the actin cytoskeleton at the nanoscale.
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Affiliation(s)
- Manasa V Gudheti
- Department of Physics and Astronomy, University of Maine, Orono, ME, USA
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Egea G, Serra-Peinado C, Salcedo-Sicilia L, Gutiérrez-Martínez E. Actin acting at the Golgi. Histochem Cell Biol 2013; 140:347-60. [PMID: 23807268 DOI: 10.1007/s00418-013-1115-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2013] [Indexed: 01/08/2023]
Abstract
The organization, assembly and remodeling of the actin cytoskeleton provide force and tracks for a variety of (endo)membrane-associated events such as membrane trafficking. This review illustrates in different cellular models how actin and many of its numerous binding and regulatory proteins (actin and co-workers) participate in the structural organization of the Golgi apparatus and in trafficking-associated processes such as sorting, biogenesis and motion of Golgi-derived transport carriers.
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Affiliation(s)
- Gustavo Egea
- Departament de Biologia Cel·lular, Immunologia i Neurociències, Facultat de Medicina, Universitat de Barcelona, C/Casanova, 143, 08036, Barcelona, Spain.
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Chabas JF, Stephan D, Marqueste T, Garcia S, Lavaut MN, Nguyen C, Legre R, Khrestchatisky M, Decherchi P, Feron F. Cholecalciferol (vitamin D₃) improves myelination and recovery after nerve injury. PLoS One 2013; 8:e65034. [PMID: 23741446 PMCID: PMC3669361 DOI: 10.1371/journal.pone.0065034] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 04/21/2013] [Indexed: 11/21/2022] Open
Abstract
Previously, we demonstrated i) that ergocalciferol (vitamin D2) increases axon diameter and potentiates nerve regeneration in a rat model of transected peripheral nerve and ii) that cholecalciferol (vitamin D3) improves breathing and hyper-reflexia in a rat model of paraplegia. However, before bringing this molecule to the clinic, it was of prime importance i) to assess which form - ergocalciferol versus cholecalciferol - and which dose were the most efficient and ii) to identify the molecular pathways activated by this pleiotropic molecule. The rat left peroneal nerve was cut out on a length of 10 mm and autografted in an inverted position. Animals were treated with either cholecalciferol or ergocalciferol, at the dose of 100 or 500 IU/kg/day, or excipient (Vehicle), and compared to unlesioned rats (Control). Functional recovery of hindlimb was measured weekly, during 12 weeks, using the peroneal functional index. Ventilatory, motor and sensitive responses of the regenerated axons were recorded and histological analysis was performed. In parallel, to identify the genes regulated by vitamin D in dorsal root ganglia and/or Schwann cells, we performed an in vitro transcriptome study. We observed that cholecalciferol is more efficient than ergocalciferol and, when delivered at a high dose (500 IU/kg/day), cholecalciferol induces a significant locomotor and electrophysiological recovery. We also demonstrated that cholecalciferol increases i) the number of preserved or newly formed axons in the proximal end, ii) the mean axon diameter in the distal end, and iii) neurite myelination in both distal and proximal ends. Finally, we found a modified expression of several genes involved in axogenesis and myelination, after 24 hours of vitamin supplementation. Our study is the first to demonstrate that vitamin D acts on myelination via the activation of several myelin-associated genes. It paves the way for future randomised controlled clinical trials for peripheral nerve or spinal cord repair.
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Affiliation(s)
- Jean-Francois Chabas
- Aix Marseille Université, CNRS, NICN UMR 7259, Marseille, France
- APHM, Hôpital de la Conception, Services de Chirurgie de la Main, Chirurgie Plastique et Réparatrice des Membres, Marseille, France
| | - Delphine Stephan
- Aix Marseille Université, CNRS, NICN UMR 7259, Marseille, France
| | | | - Stephane Garcia
- Aix Marseille Université, Service Hospitalier d'Anatomie et Cytologie Pathologiques Humaines, Assistance Publique - Hôpitaux de Marseille, Marseille, France
- Aix Marseille Université, INSERM U1068, Marseille, France
| | - Marie-Noelle Lavaut
- Aix Marseille Université, Service Hospitalier d'Anatomie et Cytologie Pathologiques Humaines, Assistance Publique - Hôpitaux de Marseille, Marseille, France
- Aix Marseille Université, INSERM U1068, Marseille, France
| | - Catherine Nguyen
- Aix Marseille Université, INSERM, TAGC UMR U1090 Marseille, France
| | - Regis Legre
- APHM, Hôpital de la Conception, Services de Chirurgie de la Main, Chirurgie Plastique et Réparatrice des Membres, Marseille, France
| | | | | | - Francois Feron
- Aix Marseille Université, CNRS, NICN UMR 7259, Marseille, France
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The neural cell adhesion molecule (NCAM) associates with and signals through p21-activated kinase 1 (Pak1). J Neurosci 2013; 33:790-803. [PMID: 23303955 DOI: 10.1523/jneurosci.1238-12.2013] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The Neural cell adhesion molecule (NCAM) plays an important role in regulation of nervous system development. To expand our understanding of the molecular mechanisms via which NCAM influences differentiation of neurons, we used a yeast two-hybrid screening to search for new binding partners of NCAM and identified p21-activated kinase 1 (Pak1). We show that NCAM interacts with Pak1 in growth cones of neurons. The autophosphorylation and activity of Pak1 were enhanced when isolated growth cones were incubated with NCAM function triggering antibodies, which mimic the interaction between NCAM and its extracellular ligands. The association of Pak1 with cell membranes, the efficiency of Pak1 binding to its activators, and Pak1 activity were inhibited in brains of NCAM-deficient mice. NCAM-dependent Pak1 activation was abolished after lipid raft disruption, suggesting that NCAM promotes Pak1 activation in the lipid raft environment. Phosphorylation of the downstream Pak1 effectors LIMK1 and cofilin was reduced in growth cones from NCAM-deficient neurons, which was accompanied by decreased levels of filamentous actin and inhibited filopodium mobility in the growth cones. Dominant-negative Pak1 inhibited and constitutively active Pak1 enhanced the ability of neurons to increase neurite outgrowth in response to the extracellular ligands of NCAM. Our combined observations thus indicate that NCAM activates Pak1 to drive actin polymerization to promote neuronal differentiation.
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42
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Jausoro I, Mestres I, Quassollo G, Masseroni L, Heredia F, Caceres A. Regulation of spine density and morphology by IQGAP1 protein domains. PLoS One 2013; 8:e56574. [PMID: 23441206 PMCID: PMC3575492 DOI: 10.1371/journal.pone.0056574] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 01/15/2013] [Indexed: 11/25/2022] Open
Abstract
IQGAP1 is a scaffolding protein that regulates spine number. We now show a differential role for IQGAP1 domains in spine morphogenesis, in which a region of the N-terminus that promotes Arp2/3-mediated actin polymerization and branching stimulates spine head formation while a region that binds to Cdc42 and Rac is required for stalk extension. Conversely, IQGAP1 rescues spine deficiency induced by expression of dominant negative Cdc42 by stimulating formation of stubby spines. Together, our observations place IQGAP1 as a crucial regulator of spine number and shape acting through the N-Wasp Arp2/3 complex, as well as upstream and downstream of Cdc42.
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Affiliation(s)
- Ignacio Jausoro
- Laboratory of Neurobiology, Instituto Mercedes y Martín Ferreyra, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Ivan Mestres
- Laboratory of Neurobiology, Instituto Mercedes y Martín Ferreyra, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Gonzalo Quassollo
- Laboratory of Neurobiology, Instituto Mercedes y Martín Ferreyra, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Lujan Masseroni
- Laboratory of Neurobiology, Instituto Mercedes y Martín Ferreyra, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Florencia Heredia
- Laboratory of Neurobiology, Instituto Mercedes y Martín Ferreyra, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Alfredo Caceres
- Laboratory of Neurobiology, Instituto Mercedes y Martín Ferreyra, INIMEC-CONICET, Córdoba, Argentina
- Universidad Nacional de Córdoba, Córdoba, Argentina
- * E-mail:
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Petrosyan A, Cheng PW. A non-enzymatic function of Golgi glycosyltransferases: mediation of Golgi fragmentation by interaction with non-muscle myosin IIA. Glycobiology 2013; 23:690-708. [PMID: 23396488 DOI: 10.1093/glycob/cwt009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The Golgi apparatus undergoes morphological changes under stress or malignant transformation, but the precise mechanisms are not known. We recently showed that non-muscle myosin IIA (NMIIA) binds to the cytoplasmic tail of Core 2 N-acetylglucosaminyltransferase mucus-type (C2GnT-M) and transports it to the endoplasmic reticulum for recycling. Here, we report that Golgi fragmentation induced by brefeldin A (BFA) or coatomer protein (β-COP) knockdown (KD) in Panc1-bC2GnT-M (c-Myc) cells is accompanied by the increased association of NMIIA with C2GnT-M and its degradation by proteasomes. Golgi fragmentation is prevented by inhibition or KD of NMIIA. Using multiple approaches, we have shown that the speed of BFA-induced Golgi fragmentation is positively correlated with the levels of this enzyme in the Golgi. The observation is reproduced in LNCaP cells which express high levels of two endogenous glycosyltransferases--C2GnT-L and β-galactoside α2,3 sialyltransferase 1. NMIIA is found to form complexes with these two enzymes but not Golgi matrix proteins. The KD of both enzymes or the prevention of Golgi glycosyltransferases from exiting endoplasmic reticulum reduced Golgi-associated NMIIA and decreased the BFA-induced fragmentation. Interestingly, the fragmented Golgi detected in colon cancer HT-29 cells can be restored to a compact morphology after inhibition or KD of NMIIA. The Golgi disorganization induced by the microtubule or actin destructive agent is NMIIA-independent and does not affect the levels of glycosyltransferases. We conclude that NMIIA interacts with Golgi residential but not matrix proteins, and this interaction is responsible for Golgi fragmentation induced by β-COP KD or BFA treatment. This is a novel non-enzymatic function of Golgi glycosyltransferases.
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Affiliation(s)
- Armen Petrosyan
- Department of Research Service, VA Nebraska-Western Iowa Health Care System, Omaha, NE 68105 USA
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44
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Lepagnol-Bestel AM, Kvajo M, Karayiorgou M, Simonneau M, Gogos JA. A Disc1 mutation differentially affects neurites and spines in hippocampal and cortical neurons. Mol Cell Neurosci 2013; 54:84-92. [PMID: 23396153 DOI: 10.1016/j.mcn.2013.01.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Revised: 01/21/2013] [Accepted: 01/24/2013] [Indexed: 02/05/2023] Open
Abstract
A balanced chromosomal translocation segregating with schizophrenia and affective disorders in a large Scottish family disrupting DISC1 implicated this gene as a susceptibility gene for major mental illness. Here we study neurons derived from a genetically engineered mouse strain with a truncating lesion disrupting the endogenous Disc1 ortholog. We provide a detailed account of the consequences of this mutation on axonal and dendritic morphogenesis as well as dendritic spine development in cultured hippocampal and cortical neurons. We show that the mutation has distinct effects on these two types of neurons, supporting a cell-type specific role of Disc1 in establishing structural connections among neurons. Moreover, using a validated antibody we provide evidence indicating that Disc1 localizes primarily to Golgi apparatus-related vesicles. Our results support the notion that in vitro cultures derived from Disc1(Tm1Kara) mice provide a valuable model for future mechanistic analysis of the cellular and biochemical effects of this mutation, and can thus serve as a platform for drug discovery efforts.
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Affiliation(s)
- A M Lepagnol-Bestel
- Department of Physiology and Cellular Biophysics, Columbia University, 630 West, 168th Street, New York, NY 10032, USA
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45
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Controlled lateral packing of insulin monolayers influences neuron polarization in solid-supported cultures. Colloids Surf B Biointerfaces 2013; 107:59-67. [PMID: 23466543 DOI: 10.1016/j.colsurfb.2013.01.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 01/24/2013] [Accepted: 01/29/2013] [Indexed: 12/21/2022]
Abstract
Neurons are highly polarized cells, composed of one axon and several branching dendrites. One important issue in neurobiology is to understand the molecular factors that determine the neuron to develop polarized structures. A particularly early event, in neurons still lacking a discernible axon, is the segregation of IGF-1 (Insulin like Growth Factor-1) receptors in one neurite. This receptor can be activated by insulin in bulk, but, it is not known if changes of insulin organization as a monomolecular film may affect neuron polarization. To this end, in this work we developed solid-supported Langmuir-Blodgett films of insulin with different surface packing density. Hyppocampal pyramidal neurons, in early stage of differentiation, were cultured onto those substrates and polarization was studied after 24 h by confocal microscopy. Also we used surface reflection interference contrast microscopy and confocal microscopy to study attachment patterns and morphology of growth cones. We observed that insulin films packed at 14 mN/m induced polarization in a similar manner to high insulin concentration in bulk, but insulin packed at 44 mN/m did not induce polarization. Our results provide novel evidence that the neuron polarization through IGF-1 receptor activation can be selectively modulated by the lateral packing of insulin organized as a monomolecular surface for cell growth.
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46
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Rab33a mediates anterograde vesicular transport for membrane exocytosis and axon outgrowth. J Neurosci 2012; 32:12712-25. [PMID: 22972995 DOI: 10.1523/jneurosci.0989-12.2012] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Axon outgrowth requires plasma membrane expansion, which results from post-Golgi vesicular transport and fusion. However, the molecular mechanisms regulating post-Golgi vesicular trafficking for membrane expansion and axon outgrowth remain unclear. Here, we show that Rab33a expression became upregulated during axon outgrowth of cultured rat hippocampal neurons. Rab33a was preferentially localized to the Golgi apparatus and to synaptophysin-positive vesicles that are transported along the growing axon. Previous studies showed that synaptophysin is localized to post-Golgi vesicles transported by fast axonal transport in developing neurons. Reduction of Rab33a expression by RNAi (RNA interference) inhibited the anterograde transport of synaptophysin-positive vesicles, leading to their decrease in axonal tips. Furthermore, this treatment reduced membrane fusion of synaptophysin-positive vesicles at the growth cones and inhibited axon outgrowth. Overexpression of Rab33a, on the other hand, induced excessive accumulation of synaptophysin-positive vesicles and concurrent formation of surplus axons. These data suggest that Rab33a participates in axon outgrowth by mediating anterograde axonal transport of synaptophysin-positive vesicles and their concomitant fusion at the growth cones.
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47
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Dong Q, Ji YS, Cai C, Chen ZY. LIM kinase 1 (LIMK1) interacts with tropomyosin-related kinase B (TrkB) and Mediates brain-derived neurotrophic factor (BDNF)-induced axonal elongation. J Biol Chem 2012; 287:41720-31. [PMID: 23086941 DOI: 10.1074/jbc.m112.405415] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BDNF/TrkB signaling plays critical roles in axonal outgrowth of neurons, the process of which requires the remodeling of the cytoskeleton structure, including microtubules and filamentous actin. However, the mechanism by which BDNF/TrkB signaling regulates cytoskeleton reorganization is still unclear. Here, we identified a novel interaction between LIMK1 and TrkB, which is required for the BDNF-induced axonal elongation. We demonstrated that BDNF-induced TrkB dimerization led to LIMK1 dimerization and transphosphorylation independent of TrkB kinase activity, which could further enhance the activation and stabilization of LIMK1. Moreover, activated LIMK1 translocated to the membrane fraction and phosphorylated its substrate cofilin, thus promoting actin polymerization and axonal elongation. Our findings provided evidence of a novel mechanism for the BDNF-mediated signal transduction leading to axonal elongation.
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Affiliation(s)
- Qing Dong
- Department of Neurobiology, Shandong Provincial Key Laboratory of Mental Disorders, School of Medicine, Shandong University, Jinan, Shandong 250012, China
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48
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Tury A, Mairet-Coello G, DiCicco-Bloom E. The multiple roles of the cyclin-dependent kinase inhibitory protein p57(KIP2) in cerebral cortical neurogenesis. Dev Neurobiol 2012; 72:821-42. [PMID: 22076965 DOI: 10.1002/dneu.20999] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The members of the CIP/KIP family of cyclin-dependent kinase (CDK) inhibitory proteins (CKIs), including p57(KIP2), p27(KIP1), and p21(CIP1), block the progression of the cell cycle by binding and inhibiting cyclin/CDK complexes of the G1 phase. In addition to this well-characterized function, p57(KIP2) and p27(KIP1) have been shown to participate in an increasing number of other important cellular processes including cell fate and differentiation, cell motility and migration, and cell death/survival, both in peripheral and central nervous systems. Increasing evidence over the past few years has characterized the functions of the newest CIP/KIP member p57(KIP2) in orchestrating cell proliferation, differentiation, and migration during neurogenesis. Here, we focus our discussion on the multiple roles played by p57(KIP2) during cortical development, making comparisons to p27(KIP1) as well as the INK4 family of CKIs.
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Affiliation(s)
- Anna Tury
- Department of Neuroscience and Cell Biology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA
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Siudeja K, Grzeschik NA, Rana A, de Jong J, Sibon OCM. Cofilin/Twinstar phosphorylation levels increase in response to impaired coenzyme a metabolism. PLoS One 2012; 7:e43145. [PMID: 22912811 PMCID: PMC3422318 DOI: 10.1371/journal.pone.0043145] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 07/19/2012] [Indexed: 11/19/2022] Open
Abstract
Coenzyme A (CoA) is a pantothenic acid-derived metabolite essential for many fundamental cellular processes including energy, lipid and amino acid metabolism. Pantothenate kinase (PANK), which catalyses the first step in the conversion of pantothenic acid to CoA, has been associated with a rare neurodegenerative disorder PKAN. However, the consequences of impaired PANK activity are poorly understood. Here we use Drosophila and human neuronal cell cultures to show how PANK deficiency leads to abnormalities in F-actin organization. Cells with reduced PANK activity are characterized by abnormally high levels of phosphorylated cofilin, a conserved actin filament severing protein. The increased levels of phospho-cofilin coincide with morphological changes of PANK-deficient Drosophila S2 cells and human neuronal SHSY-5Y cells. The latter exhibit also markedly reduced ability to form neurites in culture--a process that is strongly dependent on actin remodeling. Our results reveal a novel and conserved link between a metabolic biosynthesis pathway, and regulation of cellular actin dynamics.
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Affiliation(s)
| | | | | | | | - Ody C. M. Sibon
- Department of Cell Biology, Radiation and Stress Cell Biology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- * E-mail:
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Neuronal polarity: demarcation, growth and commitment. Curr Opin Cell Biol 2012; 24:547-53. [PMID: 22726583 DOI: 10.1016/j.ceb.2012.05.011] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Accepted: 05/23/2012] [Indexed: 02/03/2023]
Abstract
In a biological sense, polarity refers to the extremity of the main axis of an organelle, cell, or organism. In neurons, morphological polarity begins with the appearance of the first neurite from the cell body. In multipolar neurons, a second phase of polarization occurs when a single neurite initiates a phase of rapid growth to become the neuron's axon, while the others later differentiate as dendrites. Finally, during a third phase, axons and dendrites develop an elaborate architecture, acquiring special morphological and molecular features that commit them to their final identities. Mechanistically, each phase must be preceded by spatial restriction of growth activity. We will review recent work on the mechanisms underlying the polarized growth of neurons.
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