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Ota E, Takeda D, Oonuma K, Kato M, Matoba H, Yoritate M, Sodeoka M, Hirai G. Synthesis and biological activity of ganglioside GM3 analogues with a (S)-CHF-Sialoside linkage and an alkyne tag. Glycoconj J 2023; 40:333-341. [PMID: 36939991 DOI: 10.1007/s10719-023-10111-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 02/25/2023] [Accepted: 03/07/2023] [Indexed: 03/21/2023]
Abstract
The alkyne tag, consisting of only two carbons, is widely used as a bioorthogonal functional group due to its compactness and nonpolar structure, and various probes consisting of lipids bearing an alkyne tag have been developed. Here, we designed and synthesized analogues of ganglioside GM3 bearing an alkyne tag in the fatty acid moiety and evaluated the effect of the alkyne tag on the biological activity. To eliminate the influence of other factors such as degradation of the glycan chain when evaluating biological activity in a cellular environment, we introduced the tag into sialidase-resistant (S)-CHF-linked GM3 analogues developed by our group. The designed analogues were efficiently synthesized by tuning the protecting group of the glucosylsphingosine acceptor. The growth-promoting effect of these analogues on Had-1 cells was dramatically altered depending upon the position of the alkyne tag.
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Affiliation(s)
- Eisuke Ota
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Daiki Takeda
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-Ku, Fukuoka, 812-8582, Japan
| | - Kana Oonuma
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Marie Kato
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Hiroaki Matoba
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-Ku, Fukuoka, 812-8582, Japan
| | - Makoto Yoritate
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-Ku, Fukuoka, 812-8582, Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan.
- RIKEN Center for Sustainable Resource Science, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Go Hirai
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan.
- RIKEN Center for Sustainable Resource Science, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan.
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-Ku, Fukuoka, 812-8582, Japan.
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Chiricozzi E, Lunghi G, Di Biase E, Fazzari M, Sonnino S, Mauri L. GM1 Ganglioside Is A Key Factor in Maintaining the Mammalian Neuronal Functions Avoiding Neurodegeneration. Int J Mol Sci 2020; 21:E868. [PMID: 32013258 PMCID: PMC7037093 DOI: 10.3390/ijms21030868] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/23/2020] [Accepted: 01/27/2020] [Indexed: 12/11/2022] Open
Abstract
Many species of ganglioside GM1, differing for the sialic acid and ceramide content, have been characterized and their physico-chemical properties have been studied in detail since 1963. Scientists were immediately attracted to the GM1 molecule and have carried on an ever-increasing number of studies to understand its binding properties and its neurotrophic and neuroprotective role. GM1 displays a well balanced amphiphilic behavior that allows to establish strong both hydrophobic and hydrophilic interactions. The peculiar structure of GM1 reduces the fluidity of the plasma membrane which implies a retention and enrichment of the ganglioside in specific membrane domains called lipid rafts. The dynamism of the GM1 oligosaccharide head allows it to assume different conformations and, in this way, to interact through hydrogen or ionic bonds with a wide range of membrane receptors as well as with extracellular ligands. After more than 60 years of studies, it is a milestone that GM1 is one of the main actors in determining the neuronal functions that allows humans to have an intellectual life. The progressive reduction of its biosynthesis along the lifespan is being considered as one of the causes underlying neuronal loss in aged people and severe neuronal decline in neurodegenerative diseases. In this review, we report on the main knowledge on ganglioside GM1, with an emphasis on the recent discoveries about its bioactive component.
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Affiliation(s)
| | | | | | | | - Sandro Sonnino
- Department of Medical Biotechnology and Translational Medicine, University of Milano, 20090 Segrate, Milano, Italy; (E.C.)
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3
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Chiricozzi E, Biase ED, Maggioni M, Lunghi G, Fazzari M, Pomè DY, Casellato R, Loberto N, Mauri L, Sonnino S. GM1 promotes TrkA-mediated neuroblastoma cell differentiation by occupying a plasma membrane domain different from TrkA. J Neurochem 2019; 149:231-241. [PMID: 30776097 DOI: 10.1111/jnc.14685] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/23/2019] [Accepted: 02/14/2019] [Indexed: 11/30/2022]
Abstract
Recently, we highlighted that the ganglioside GM1 promotes neuroblastoma cells differentiation by activating the TrkA receptor through the formation of a TrkA-GM1 oligosaccharide complex at the cell surface. To study the TrkA-GM1 interaction, we synthesized two radioactive GM1 derivatives presenting a photoactivable nitrophenylazide group at the end of lipid moiety, 1 or at position 6 of external galactose, 2; and a radioactive oligosaccharide portion of GM1 carrying the nitrophenylazide group at position 1 of glucose, 3. The three compounds were singly administered to cultured neuroblastoma Neuro2a cells under established conditions that allow cell surface interactions. After UV activation of photoactivable compounds, the proteins were analyzed by PAGE separation. The formation of cross-linked TrkA-GM1 derivatives complexes was identified by both radioimaging and immunoblotting. Results indicated that the administration of compounds 2 and 3, carrying the photoactivable group on the oligosaccharide, led to the formation of a radioactive TrkA complex, while the administration of compound 1 did not. This underlines that the TrkA-GM1 interaction directly involves the GM1 oligosaccharide, but not the ceramide. To better understand how GM1 relates to the TrkA, we isolated plasma membrane lipid rafts. As expected, GM1 was found in the rigid detergent-resistant fractions, while TrkA was found as a detergent soluble fraction component. These results suggest that TrkA and GM1 belong to separate membrane domains: probably TrkA interacts by 'flopping' down its extracellular portion onto the membrane, approaching its interplay site to the oligosaccharide portion of GM1.
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Affiliation(s)
- Elena Chiricozzi
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Erika Di Biase
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Margherita Maggioni
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Giulia Lunghi
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Maria Fazzari
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Diego Yuri Pomè
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Riccardo Casellato
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Nicoletta Loberto
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Laura Mauri
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Sandro Sonnino
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
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4
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Schwarzmann G. Labeled gangliosides: their synthesis and use in biological studies. FEBS Lett 2018; 592:3992-4006. [DOI: 10.1002/1873-3468.13239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 08/31/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Günter Schwarzmann
- LIMES c/o Kekulé‐Institut f. Organische Chemie und Biochemie Rheinische Friedrich‐Wilhelms‐Universität Bonn Germany
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5
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Abstract
For the physicochemical studies aimed at elucidating the dynamic of gangliosides in membranes and their interaction with proteins and membrane lipids, photoactivatable and paramagnetic ganglioside derivatives have proved to be invaluable tools. Here, protocols for the synthesis of such ganglioside derivatives are described. These derivatives bear in their ceramide portion either a highly photoreactive (3-trifluoromethyl)phenyldiazirinyl- or a spin active doxyl-labeled acyl chain in place of their natural acyl chain.
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Affiliation(s)
- Günter Schwarzmann
- LIMES, c/o Kekulé-Institut f. Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany.
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Chiricozzi E, Pomè DY, Maggioni M, Di Biase E, Parravicini C, Palazzolo L, Loberto N, Eberini I, Sonnino S. Role of the GM1 ganglioside oligosaccharide portion in the TrkA-dependent neurite sprouting in neuroblastoma cells. J Neurochem 2017; 143:645-659. [PMID: 28796418 DOI: 10.1111/jnc.14146] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/12/2017] [Accepted: 08/02/2017] [Indexed: 11/27/2022]
Abstract
GM1 ganglioside (II3 NeuAc-Gg4 Cer) is known to promote neurite formation in neuroblastoma cells by activating TrkA-MAPK pathway. The molecular mechanism by which GM1 is involved in the neurodifferentiation process is still unknown, however, in vitro and in vivo evidences have suggested that the oligosaccharide portion of this ganglioside could be involved. Here, we report that, similarly to the entire GM1 molecule, its oligosaccharide II3 NeuAc-Gg4, rather than its ceramide (Cer) portion is responsible for the neurodifferentiation process by augmenting neurite elongation and increasing the neurofilament protein expression in murine neuroblastoma cells, Neuro2a. Conversely, asialo-GM1, GM2 and GM3 oligosaccharides are not effective in neurite elongation on Neuro2a cells, whereas the effect exerted by the Fuc-GM1 oligosaccharide (IV2 αFucII3 Neu5Ac-Gg4 ) is similar to that exerted by GM1 oligosaccharide. The neurotrophic properties of GM1 oligosaccharide are exerted by activating the TrkA receptor and the following phosphorylation cascade. By photolabeling experiments performed with a nitrophenylazide containing GM1 oligosaccharide, labeled with tritium, we showed a direct interaction between the GM1 oligosaccharide and the extracellular domain of TrkA receptor. Moreover, molecular docking analyses confirmed that GM1 oligosaccharide binds the TrkA-nerve growth factor complex leading to a binding free energy of approx. -11.5 kcal/mol, acting as a bridge able to increase and stabilize the TrkA-nerve growth factor molecular interactions.
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Affiliation(s)
- Elena Chiricozzi
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Segrate, Milano, Italy
| | - Diego Yuri Pomè
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Segrate, Milano, Italy
| | - Margherita Maggioni
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Segrate, Milano, Italy
| | - Erika Di Biase
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Segrate, Milano, Italy
| | - Chiara Parravicini
- Department of Pharmacological and Biomolecular Sciences, University of Milano, Milano, Italy
| | - Luca Palazzolo
- Department of Pharmacological and Biomolecular Sciences, University of Milano, Milano, Italy
| | - Nicoletta Loberto
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Segrate, Milano, Italy
| | - Ivano Eberini
- Department of Pharmacological and Biomolecular Sciences, University of Milano, Milano, Italy
| | - Sandro Sonnino
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Segrate, Milano, Italy
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7
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Pirazzini M, Rossetto O, Eleopra R, Montecucco C. Botulinum Neurotoxins: Biology, Pharmacology, and Toxicology. Pharmacol Rev 2017; 69:200-235. [PMID: 28356439 PMCID: PMC5394922 DOI: 10.1124/pr.116.012658] [Citation(s) in RCA: 410] [Impact Index Per Article: 58.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The study of botulinum neurotoxins (BoNT) is rapidly progressing in many aspects.
Novel BoNTs are being discovered owing to next generation sequencing, but their
biologic and pharmacological properties remain largely unknown. The molecular
structure of the large protein complexes that the toxin forms with accessory
proteins, which are included in some BoNT type A1 and B1 pharmacological
preparations, have been determined. By far the largest effort has been dedicated to
the testing and validation of BoNTs as therapeutic agents in an ever increasing
number of applications, including pain therapy. BoNT type A1 has been also exploited
in a variety of cosmetic treatments, alone or in combination with other agents, and
this specific market has reached the size of the one dedicated to the treatment of
medical syndromes. The pharmacological properties and mode of action of BoNTs have
shed light on general principles of neuronal transport and protein-protein
interactions and are stimulating basic science studies. Moreover, the wide array of
BoNTs discovered and to be discovered and the production of recombinant BoNTs endowed
with specific properties suggest novel uses in therapeutics with increasing
disease/symptom specifity. These recent developments are reviewed here to provide an
updated picture of the biologic mechanism of action of BoNTs, of their increasing use
in pharmacology and in cosmetics, and of their toxicology.
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Affiliation(s)
- Marco Pirazzini
- Department of Biomedical Sciences, University of Padova, Italy (M.P., O.R., C.M.); Neurologic Department, University-Hospital S. Maria della Misericordia, Udine, Italy (R.E.); and Consiglio Nazionale delle Ricerche, Institute of Neuroscience, University of Padova, Italy (C.M.)
| | - Ornella Rossetto
- Department of Biomedical Sciences, University of Padova, Italy (M.P., O.R., C.M.); Neurologic Department, University-Hospital S. Maria della Misericordia, Udine, Italy (R.E.); and Consiglio Nazionale delle Ricerche, Institute of Neuroscience, University of Padova, Italy (C.M.)
| | - Roberto Eleopra
- Department of Biomedical Sciences, University of Padova, Italy (M.P., O.R., C.M.); Neurologic Department, University-Hospital S. Maria della Misericordia, Udine, Italy (R.E.); and Consiglio Nazionale delle Ricerche, Institute of Neuroscience, University of Padova, Italy (C.M.)
| | - Cesare Montecucco
- Department of Biomedical Sciences, University of Padova, Italy (M.P., O.R., C.M.); Neurologic Department, University-Hospital S. Maria della Misericordia, Udine, Italy (R.E.); and Consiglio Nazionale delle Ricerche, Institute of Neuroscience, University of Padova, Italy (C.M.)
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8
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GM1 Ganglioside: Past Studies and Future Potential. Mol Neurobiol 2015; 53:1824-1842. [DOI: 10.1007/s12035-015-9136-z] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 02/22/2015] [Indexed: 10/23/2022]
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Chiricozzi E, Ciampa MG, Brasile G, Compostella F, Prinetti A, Nakayama H, Ekyalongo RC, Iwabuchi K, Sonnino S, Mauri L. Direct interaction, instrumental for signaling processes, between LacCer and Lyn in the lipid rafts of neutrophil-like cells. J Lipid Res 2014; 56:129-41. [PMID: 25418321 DOI: 10.1194/jlr.m055319] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Lactosylceramide [LacCer; β-Gal-(1-4)-β-Glc-(1-1)-Cer] has been shown to contain very long fatty acids that specifically modulate neutrophil properties. The interactions between LacCer and proteins and their role in cell signaling processes were assessed by synthesizing two molecular species of azide-photoactivable tritium-labeled LacCer having acyl chains of different lengths. The lengths of the two acyl chains corresponded to those of a short/medium and very long fatty acid, comparable to the lengths of stearic and lignoceric acids, respectively. These derivatives, designated C18-[(3)H]LacCer-(N3) and C24-[(3)H]LacCer-(N3), were incorporated into the lipid rafts of plasma membranes of neutrophilic differentiated HL-60 (D-HL-60) cells. C24-[(3)H]LacCer-(N3), but not C18-[(3)H]LacCer-(N3), induced the phosphorylation of Lyn and promoted phagocytosis. Incorporation of C24-[(3)H]LacCer-(N3) into plasma membranes, followed by illumination, resulted in the formation of several tritium-labeled LacCer-protein complexes, including the LacCer-Lyn complex, into plasma membrane lipid rafts. Administration of C18-[(3)H]LacCer-(N3) to cells, however, did not result in the formation of the LacCer-Lyn complex. These results suggest that LacCer derivatives mimic the biological properties of natural LacCer species and can be utilized as tools to study LacCer-protein interactions, and confirm a specific direct interaction between LacCer species containing very long fatty acids, and Lyn protein, associated with the cytoplasmic layer via myristic/palmitic chains.
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Affiliation(s)
- Elena Chiricozzi
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
| | - Maria Grazia Ciampa
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
| | - Giuseppina Brasile
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
| | - Federica Compostella
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
| | - Alessandro Prinetti
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
| | - Hitoshi Nakayama
- Institute for Environmental Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Roudy C Ekyalongo
- Institute for Environmental Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Kazuhisa Iwabuchi
- Institute for Environmental Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Sandro Sonnino
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
| | - Laura Mauri
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milano, Italy
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Aureli M, Prioni S, Mauri L, Loberto N, Casellato R, Ciampa MG, Chigorno V, Prinetti A, Sonnino S. Photoactivable sphingosine as a tool to study membrane microenvironments in cultured cells. J Lipid Res 2009; 51:798-808. [PMID: 19820263 DOI: 10.1194/jlr.m001974] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Human fibroblasts from normal subjects and Niemann-Pick A (NPA) disease patients were fed with two labeled metabolic precursors of sphingomyelin (SM), [(3)H]choline and photoactivable sphingosine, that entered into the biosynthetic pathway allowing the synthesis of radioactive phosphatidylcholine and SM, and of radioactive and photoactivable SM ([(3)H]SM-N(3)). Detergent resistant membrane (DRM) fractions prepared from normal and NPA fibroblasts resulted as highly enriched in [(3)H]SM-N(3). However, lipid and protein analysis showed strong differences between the two cell types. After cross-linking, different patterns of SM-protein complexes were found, mainly associated with the detergent soluble fraction of the gradient containing most cell proteins. After cell surface biotinylation, DRMs were immunoprecipitated using streptavidin. In conditions that maintain the integrity of domain, SM-protein complexes were detectable only in normal fibroblasts, whereas disrupting the membrane organization, these complexes were not recovered in the immunoprecipitate, suggesting that they involve proteins belonging to the inner membrane layer. These data suggest that differences in lipid and protein compositions of these cell lines determine specific lipid-protein interactions and different clustering within plasma membrane. In addition, our experiments show that photoactivable sphingolipids metabolically synthesized in cells can be used to study sphingolipid protein environments and sphingolipid-protein interactions.
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Affiliation(s)
- Massimo Aureli
- Department of Medical Chemistry Biochemistry and Biotechnology Center of Excellence on Neurodegenerative Diseases, University of Milano, Segrate, Italy
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Prinetti A, Aureli M, Illuzzi G, Prioni S, Nocco V, Scandroglio F, Gagliano N, Tredici G, Rodriguez-Menendez V, Chigorno V, Sonnino S. GM3 synthase overexpression results in reduced cell motility and in caveolin-1 upregulation in human ovarian carcinoma cells. Glycobiology 2009; 20:62-77. [PMID: 19759399 DOI: 10.1093/glycob/cwp143] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
In this paper, we describe the effects of the expression of GM3 synthase at high levels in human ovarian carcinoma cells. Overexpression of GM3 synthase in A2780 cells consistently resulted in elevated ganglioside (GM3, GM2 and GD1a) levels. GM3 synthase overexpressing cells had a growth rate similar to wild-type cells, but showed a strongly reduced in vitro cell motility accompanied by reduced levels of the epithelial-mesenchymal transition marker alpha smooth muscle actin. A similar reduction in cell motility was observed upon treatment with exogenous GM3, GM2, and GM1, but not with GD1a. A photolabeling experiment using radioactive and photoactivable GM3 highlighted several proteins directly interacting with GM3. Among those, caveolin-1 was identified as a GM3-interacting protein in GM3 synthase overexpressing cells. Remarkably, caveolin-1 was markedly upregulated in GM3 synthase overexpressing cells. In addition, the motility of low GM3 synthase expressing cells was also reduced in the presence of a Src kinase inhibitor; on the other hand, higher levels of the inactive form of c-Src were detected in GM3 synthase overexpressing cells, associated with a ganglioside- and caveolin-rich detergent insoluble fraction.
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Affiliation(s)
- Alessandro Prinetti
- Department of Medical Chemistry, Biochemistry and Biotechnology, Center of Excellence on Neurodegenerative Diseases, Biochemistry and Biotechnology, University of Milan, Italy.
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Abstract
In this review focus is given to the metabolic turnover of gangliosides/glycosphingolipids. The metabolism and accompanying intracellular trafficking of gangliosides/glycosphingolipids is illustrated with particular attention to the following events: (a) the de novo biosynthesis in the endoplasmic reticulum and Golgi apparatus, followed by vesicular sorting to the plasma membrane; (b) the enzyme-assisted chemical modifications occurring at the plasma membrane level; (c) the internalization via endocytosis and recycling to the plasma membrane; (d) the direct glycosylations taking place after sorting from endosomes to the Golgi apparatus; (e) the degradation at the late endosomal/lysosomal level with formation of fragments of sugar (glucose, galactose, hexosamine, sialic acid) and lipid (ceramide, sphingosine, fatty acid) nature; (f) the metabolic recycling of these fragments for biosynthetic purposes (salvage pathways); and (g) further degradation of fragments to waste products. Noteworthy, the correct course of ganglioside/glycosphingolipid metabolism requires the presence of the vimentin intracellular filament net work, likely to assist intracellular transport of sphingoid molecules. ut of the above events those that can be quantitatively evaluated with acceptable reliability are the processes of de novo biosynthesis, metabolic salvage and direct glycosylation. Depending on the cultured cells employed, the percentage of distribution of de novo biosynthesis, salvage pathways, and direct glycosylation, over total metabolism were reported to be: 35% (range: 10-90%) for de novo biosynthesis, 7% (range: 5-10%) for direct glycosylation, and 58% (range: 10-90%) for salvage pathways. The attempts made to calculate the half-life of overall ganglioside turnover provided data of unsure reliability, especially because in many studies salvage pathways were not taken into consideration. The values of half-life range from 2 to 6.5 h to 3 days depending on the cells used. Available evidence for changes of ganglioside/glycosphingolipid turnover, due to extracellular stimuli, is also considered and discussed.
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Affiliation(s)
- G Tettamanti
- Department of Medical Chemistry, Biochemistry and Biotechnology, and Study Center for the Functional Biochemistry and Biotechnology of Glycolipids, The Medical School, University of Milan, Italy.
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Loberto N, Prioni S, Prinetti A, Ottico E, Chigorno V, Karagogeos D, Sonnino S. The adhesion protein TAG-1 has a ganglioside environment in the sphingolipid-enriched membrane domains of neuronal cells in culture. J Neurochem 2003; 85:224-33. [PMID: 12641744 DOI: 10.1046/j.1471-4159.2003.01655.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We studied the interactions between gangliosides and proteins at the exoplasmic surface of the sphingolipid-enriched membrane domains by ganglioside photolabeling combined with cell surface biotin labeling. After cell photolabeling with radioactive photoactivable derivatives of GM3, GM1 and GD1b gangliosides, followed by cell surface biotin labeling, sphingolipid-enriched domains were prepared and immunoprecipitated with streptavidin-coupled beads, under experimental conditions preserving the integrity of the lipid domain. About 50% of the total radioactivity linked to proteins was associated with acylated tubulin, about 10% with a 135-kDa protein present as a series of species with pI ranging from 6.5 to 8.0, about 5% with a protein of about 70 kDa and with pI near to 6.5. By immunoprecipitation with streptavidin-coupled beads under conditions disrupting the integrity of the lipid domain, the 135 kDa protein was recovered in the immunoprecipitate, that did not contain tubulin. Thus, the 135 kDa protein has an exoplasmic domain, and it was then identified as the GPI-anchored neural cell adhesion molecule TAG-1. Remarkably, TAG-1 was cross-linked in a similar extent by the photoactivated ganglioside GM3, GM1 and GD1b. The three gangliosides bear different oligosaccharide chains, suggesting that the ganglioside/TAG-1 interaction is not specifically associated with the ganglioside oligosaccharide structure.
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Affiliation(s)
- Nicoletta Loberto
- Center of Excellence on Neurodegenerative Diseases, Study Center for the Biochemistry and Biotechnology of Glycolipids, Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, Segrate, Italy
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14
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Abstract
In this review, the focus is on the role of salvage pathways in glycosphingolipid, particularly, ganglioside metabolism. Ganglioside de novo biosynthesis, that begins with the formation of ceramide and continues with the sequential glycosylation steps producing the oligosaccharide moieties, is briefly outlined in its enzymological and cell-topological aspects. Neo-synthesized gangliosides are delivered to the plasma membrane, where their oligosaccharide chains protrude toward the cell exterior. The metabolic fate of gangliosides after internalization via endocytosis is then described, illustrating: (a) the direct recycling of gangliosides to the plasma membrane through vesicles gemmated from sorting endosomes; (b) the sorting through endosomal vesicles to the Golgi apparatus where additional glycosylations may take place; and (c) the channelling to the endosomal/lysosomal system, where complete degradation occurs with formation of the individual sugar (glucose, galactose, hexosamine, sialic acid) and lipid (ceramide, sphingosine, fatty acid) components of gangliosides. The in vivo and in vitro evidence concerning the metabolic recycling of these components is examined in detail. The notion arises that these salvage pathways, leading to the formation of gangliosides and other glycosphingolipids, sphingomyelin, glycoproteins and glycosaminoglycans, represent an important saving of energy in the cell economy and constitute a relevant event in overall ganglioside (or glycosphingolipid, in general) turnover, covering from 50% to 90% of it, depending on the cell line and stage of cell life. Sialic acid is the moiety most actively recycled for metabolic purposes, followed by sphingosine, hexosamine, galactose and fatty acid. Finally, the importance of salvage processes in controlling the active concentrations of ceramide and sphingosine, known to carry peculiar bioregulatory/signalling properties, is discussed.
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Affiliation(s)
- G Tettamanti
- Department of Medical Chemistry, Biochemistry and Biotechnology, and Study Center for the Functional Biochemistry and Biotechnology of Glycolipids, The Medical School, University of Milan, LITA-Segrate, Italy.
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15
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Palestini P, Pitto M, Tedeschi G, Ferraretto A, Parenti M, Brunner J, Masserini M. Tubulin anchoring to glycolipid-enriched, detergent-resistant domains of the neuronal plasma membrane. J Biol Chem 2000; 275:9978-85. [PMID: 10744673 DOI: 10.1074/jbc.275.14.9978] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
After incubation of intact living cultured rat cerebellar granule cells at 37 degrees C with a new GM1 ganglioside analog, carrying a diazirine group and labeled with (125)I in the ceramide moiety, followed by photoactivation, a relatively small number of radiolabeled proteins were detected in a membrane-enriched fraction. A protein of about 55 kDa with a pI of about 5 carried a large portion of the radioactivity even if incubation and cross-linking were performed at 4 degrees C and in the presence of inhibitors of endocytosis, suggesting that it is cross-linked at the plasma membrane. Immunoprecipitation and Western blotting experiments showed the positivity of this protein for tubulin. Trypsin treatment of intact cells ruled out the involvement of a plasma membrane surface tubulin. Release of radioactivity from cross-linked tubulin after KOH treatment (but not hydroxylamine treatment) suggested that the photoactivated ganglioside reacts with an ester-linked fatty acid anchor of tubulin. Low buoyancy, detergent-resistant membrane fractions, isolated from cells after incubation with the GM1 analogue and photoactivation, proved their enrichment in endogenous and radioactive GM1 ganglioside, sphingomyelin, cholesterol, signal transduction proteins, and tubulin. It is noteworthy that radioactive tubulin was also detected in this fraction, indicating the presence of tubulin molecules carrying a fatty acid anchor in detergent-resistant, ganglioside-enriched domains of the plasma membrane. Parallel experiments carried out with a phosphatidylcholine analogue, also carrying a diazirine group and labeled with (125)I in the fatty acid moiety, showed the specificity of tubulin interaction with GM1. Taken together, these results indicate that some tubulin molecules are associated with a lipid anchor to detergent-resistant glycolipid-enriched domains of the plasma membrane. This novel feature of membrane domains can provide a key for a better understanding of their biological role.
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Affiliation(s)
- P Palestini
- Department of Experimental, Environmental Medicine and Biotechnologies, Medical School, University of Milano-Bicocca, Hospital S. Gerardo, 20052 Monza, Italy.
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16
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Affiliation(s)
- F Knoll
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Germany
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17
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Ghidoni R, Sala G, Giuliani A. Use of sphingolipid analogs: benefits and risks. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1439:17-39. [PMID: 10395962 DOI: 10.1016/s1388-1981(99)00074-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- R Ghidoni
- INSERM U410, Neuroendocrinologie et Biologie Cellulaire Digestives, Faculté de Médecine Xavier Bichat, Paris, France.
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18
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Young HP, Christian ZF, Cabeza R, Irwin LN. Uptake of exogenous gangliosides by rat brain synaptosomes. Neurochem Res 1998; 23:1515-20. [PMID: 9821155 DOI: 10.1023/a:1020971802722] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Synaptosomes incorporated mixed brain gangliosides at a rapid initial rate followed by a slower phase of net movement from the protein-associated fraction into the membrane core. The pattern of incorporated gangliosides reflected the pattern available for incorporation. Intact synaptosomes incorporated approximately 100 pmol GM1/mg protein. Synaptosomes preincubated with proteolytic enzymes (trypsin, chymotrypsin, and papain) at different pH values (6.2, 7.4, 7.8) incorporated more exogenous gangliosides than synaptosomes preincubated in buffer alone. This effect was maximal at pH 7.8, though analysis of variance revealed that the proteolytic treatment and pH effects were probably independent processes. Overall uptake of exogenous gangliosides correlated significantly with amount of membrane protein loss, indicating that initial access of exogenous gangliosides to synaptosomal membranes is retarded by cell-surface proteins. These results suggest synaptosomes as a useful alternative to cultured cells for investigating the interaction of gangliosides with other cell surface constituents.
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Affiliation(s)
- H P Young
- Department of Biological Sciences, University of Texas at El Paso 79968, USA
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19
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Riboni L, Viani P, Bassi R, Prinetti A, Tettamanti G. The role of sphingolipids in the process of signal transduction. Prog Lipid Res 1997; 36:153-95. [PMID: 9624426 DOI: 10.1016/s0163-7827(97)00008-8] [Citation(s) in RCA: 150] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- L Riboni
- Department of Medical Chemistry and Biochemistry, Medical Faculty, University of Milan, Italy
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20
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Cantù L, Corti M, Del Favero E, Digirolamo E, Sonnino S, Tettamanti G. Experimental evidence of a temperature-related conformational change of the hydrophilic portion of gangliosides. Chem Phys Lipids 1996; 79:137-45. [PMID: 8640901 DOI: 10.1016/0009-3084(96)02521-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The present paper reports the experimental observation of an interesting thermodynamic process which could be biologically important: such behaviour, shown by some gangliosides, is likely to be peculiar of these glycosidic compounds as it has never been observed for other membrane-type amphiphilic molecules. In water solution, gangliosides have been found to present a bistable behaviour between two stable states (called A and B) which does not involve any change in the primary structure of the molecule. The interconversion between state A and state B, and vice versa, does not occur spontaneously, but has to be triggered by some external agent, which makes this system a potentially regulated process with important biological correlations. In the present experiments, state B is reached from state A with a temperature rise in the range 30-55 degrees C. The new state is stable regardless of any possible temperature cycle. The initial state A is then regained when the ganglioside solution is dried and the solute is redissolved. The two states are believed to correspond to two different conformations of the hydrophilic portion of the molecule. The bistable behaviour is shown by the gangliosides GM2, GM1, GD1a, GD1b and Fuc-GD1b, GT1b, however, does not show such an effect.
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Affiliation(s)
- L Cantù
- Department of Medical Chemistry and Biochemistry, Medical School, University of Milan, Italy
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21
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Fra AM, Masserini M, Palestini P, Sonnino S, Simons K. A photo-reactive derivative of ganglioside GM1 specifically cross-links VIP21-caveolin on the cell surface. FEBS Lett 1995; 375:11-4. [PMID: 7498456 DOI: 10.1016/0014-5793(95)95228-o] [Citation(s) in RCA: 144] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Previous studies have shown that sphingolipids may be enriched in caveolae, plasmalemmal invaginations implicated in endocytosis and signal transduction. We synthesised a radiolabeled derivative of ganglioside GM1 bearing a photo-reactive cross-linker at the end of its acyl chain. After insertion in the plasma membrane of cultured A431 or MDCK cells and photoactivation, the main protein cross-linked by the GM1 derivative was VIP21-caveolin, an essential structural component of caveolae. This result shows close proximity between GM1 molecules and VIP21-caveolin in the caveolar membrane and strongly implicates sphingolipid segregation in the biogenesis of caveolae.
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Affiliation(s)
- A M Fra
- European Molecular Biology Laboratory, Heidelberg, Germany
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22
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Pacuszka T, Panasiewicz M. Photochemical labeling of human erythrocyte membranes with radioiodinatable azidosalicylic acid derivative of globoside. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1257:265-73. [PMID: 7647102 DOI: 10.1016/0005-2760(95)00082-n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In an attempt to define glycolipid functions we have prepared photoactivatable, iodinatable derivative of globoside and used it for photoaffinity labeling of human erythrocyte membranes. Lysogloboside (Gb4Sph) was prepared from globoside through deacylation in methanolic KOH followed by re-N-acetylation of galactosaminyl residue. The NH2 group of sphingosine residue in Gb4 Sph reacted with N-hydroxysuccinimidyl-4-azidosalicylic acid resulting in the formation of Gb4Sph-ASA which was purified by preparative tlc and column chromatography. It migrated on tlc as a single spot in two solvent systems, was susceptible to leech ceramide glycanase and could be radioiodinated to a specific radioactivity of about 200 Ci/mmol. Gb4Sph-[125I]ASA was incorporated into human erythrocytes in a time and concentration-dependent manner. Before photolysis 96% of the Gb4Sph-ASA could be removed with albumin but not with trypsin. After photolysis about 50% of the label was firmly bound to erythrocytes being resistant to albumin and trypsin treatment. The label was distributed between membrane proteins and lipids in about 1:2.3 ratio. Photolabeled proteins were analyzed by SDS-PAGE followed by autoradiography and immunostaining. Most of the radioactivity was detected in band 3 and its proteolytic fragments irrespective of the duration of photolysis. Photolabeling of erythrocyte lipids was demonstrated by Sephadex LH-20 column chromatography.
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Affiliation(s)
- T Pacuszka
- Department of Biochemistry, Medical Center of Postgraduate Education, Warsaw, Poland
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23
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Tettamanti G, Riboni L. Gangliosides turnover and neural cells function: a new perspective. PROGRESS IN BRAIN RESEARCH 1994; 101:77-100. [PMID: 8029470 DOI: 10.1016/s0079-6123(08)61941-x] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- G Tettamanti
- Department of Medical Chemistry and Biochemistry, Medical School, University of Milan, Italy
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24
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Saqr HE, Pearl DK, Yates AJ. A review and predictive models of ganglioside uptake by biological membranes. J Neurochem 1993; 61:395-411. [PMID: 8336130 DOI: 10.1111/j.1471-4159.1993.tb02140.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- H E Saqr
- Division of Neuropathology, Ohio State University, Columbus
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25
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Hiraiwa M, Soeda S, Kishimoto Y, O'Brien JS. Binding and transport of gangliosides by prosaposin. Proc Natl Acad Sci U S A 1992; 89:11254-8. [PMID: 1454804 PMCID: PMC50528 DOI: 10.1073/pnas.89.23.11254] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Prosaposin, the precursor of saposins A, B, C, and D, which activate lysosomal hydrolysis of sphingolipids, exists in various tissues and body fluids and is especially abundant in the nervous system. Prosaposin and saposins A,B, C, and D formed stable complexes with 13 different gangliosides as measured by an assay using column chromatography. Gangliosides of the gangliotetraose type (a series) were bound with high affinity, whereas b series gangliosides, O-acetylated gangliosides, and gangliosides with shorter carbohydrate chains, were bound with lower affinity. Prosaposin and saposins transferred gangliosides from donor liposomes to erythrocyte ghost membranes. Prosaposin also stimulated ganglioside GM1 beta-galactosidase more than mature saposins. Prosaposin exists as a secretory protein and as an integral membrane protein, and we propose that prosaposin is active as a ganglioside binding and transport protein in vivo.
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Affiliation(s)
- M Hiraiwa
- Department of Neurosciences, University of California, San Diego, School of Medicine, La Jolla 92093
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