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Grassi S, Giussani P, Mauri L, Prioni S, Sonnino S, Prinetti A. Lipid rafts and neurodegeneration: structural and functional roles in physiologic aging and neurodegenerative diseases. J Lipid Res 2020; 61:636-654. [PMID: 31871065 PMCID: PMC7193971 DOI: 10.1194/jlr.tr119000427] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/11/2019] [Indexed: 12/14/2022] Open
Abstract
Lipid rafts are small, dynamic membrane areas characterized by the clustering of selected membrane lipids as the result of the spontaneous separation of glycolipids, sphingolipids, and cholesterol in a liquid-ordered phase. The exact dynamics underlying phase separation of membrane lipids in the complex biological membranes are still not fully understood. Nevertheless, alterations in the membrane lipid composition affect the lateral organization of molecules belonging to lipid rafts. Neural lipid rafts are found in brain cells, including neurons, astrocytes, and microglia, and are characterized by a high enrichment of specific lipids depending on the cell type. These lipid rafts seem to organize and determine the function of multiprotein complexes involved in several aspects of signal transduction, thus regulating the homeostasis of the brain. The progressive decline of brain performance along with physiological aging is at least in part associated with alterations in the composition and structure of neural lipid rafts. In addition, neurodegenerative conditions, such as lysosomal storage disorders, multiple sclerosis, and Parkinson's, Huntington's, and Alzheimer's diseases, are frequently characterized by dysregulated lipid metabolism, which in turn affects the structure of lipid rafts. Several events underlying the pathogenesis of these diseases appear to depend on the altered composition of lipid rafts. Thus, the structure and function of lipid rafts play a central role in the pathogenesis of many common neurodegenerative diseases.jlr;61/5/636/F1F1f1.
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Affiliation(s)
- Sara Grassi
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Paola Giussani
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Laura Mauri
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Simona Prioni
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Sandro Sonnino
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Alessandro Prinetti
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy. mailto:
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Hunter CD, Guo T, Daskhan G, Richards MR, Cairo CW. Synthetic Strategies for Modified Glycosphingolipids and Their Design as Probes. Chem Rev 2018; 118:8188-8241. [DOI: 10.1021/acs.chemrev.8b00070] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Carmanah D. Hunter
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Tianlin Guo
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Gour Daskhan
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Michele R. Richards
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Christopher W. Cairo
- Alberta Glycomics Centre, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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Abstract
The hypothesis that the Golgi apparatus is capable of sorting proteins and sending them to the plasma membrane through "lipid rafts," membrane lipid domains highly enriched in glycosphingolipids, sphingomyelin, ceramide, and cholesterol, was formulated by van Meer and Simons in 1988 and came to a turning point when it was suggested that lipid rafts could be isolated thanks to their resistance to solubilization by some detergents, namely Triton X-100. An incredible number of papers have described the composition and properties of detergent-resistant membrane fractions. However, the use of this method has also raised the fiercest criticisms. In this chapter, we would like to discuss the most relevant methodological aspects related to the preparation of detergent-resistant membrane fractions, and to discuss the importance of discriminating between what is present on a cell membrane and what we can prepare from cell membranes in a laboratory tube.
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Aureli M, Grassi S, Prioni S, Sonnino S, Prinetti A. Lipid membrane domains in the brain. Biochim Biophys Acta Mol Cell Biol Lipids 2015; 1851:1006-16. [PMID: 25677824 DOI: 10.1016/j.bbalip.2015.02.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 01/29/2015] [Accepted: 02/01/2015] [Indexed: 12/28/2022]
Abstract
The brain is characterized by the presence of cell types with very different functional specialization, but with the common trait of a very high complexity of structures originated by their plasma membranes. Brain cells bear evident membrane polarization with the creation of different morphological and functional subcompartments, whose formation, stabilization and function require a very high level of lateral order within the membrane. In other words, the membrane specialization of brain cells implies the presence of distinct membrane domains. The brain is the organ with the highest enrichment in lipids like cholesterol, glycosphingolipids, and the most recently discovered brain membrane lipid, phosphatidylglucoside, whose collective behavior strongly favors segregation within the membrane leading to the formation of lipid-driven membrane domains. Lipid-driven membrane domains function as dynamic platforms for signal transduction, protein processing, and membrane turnover. Essential events involved in the development and in the maintenance of the functional integrity of the brain depend on the organization of lipid-driven membrane domains, and alterations in lipid homeostasis, leading to deranged lipid-driven membrane organization, are common in several major brain diseases. In this review, we summarize the forces behind the formation of lipid membrane domains and their biological roles in different brain cells. This article is part of a Special Issue entitled Brain Lipids.
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Affiliation(s)
- Massimo Aureli
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Italy
| | - Sara Grassi
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Italy
| | - Simona Prioni
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Italy
| | - Sandro Sonnino
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Italy
| | - Alessandro Prinetti
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Italy.
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Aureli M, Gritti A, Bassi R, Loberto N, Ricca A, Chigorno V, Prinetti A, Sonnino S. Plasma membrane-associated glycohydrolases along differentiation of murine neural stem cells. Neurochem Res 2012; 37:1344-54. [PMID: 22350518 DOI: 10.1007/s11064-012-0719-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 01/17/2012] [Accepted: 01/28/2012] [Indexed: 12/12/2022]
Abstract
The activities of plasma membrane associated sialidase Neu3, total β-glucosidase, CBE-sensitive β-glucosidase, non-lysosomal β-glucosyl ceramidase GBA2, β-galactosidase, β-hexosaminidase and sphingomyelinase were determined at three different stages of differentiation of murine neural stem cell cultures, corresponding to precursors, commited progenitors, and differentiated cells. Cell immunostaining for specific markers of the differentiation process, performed after 7 days in culture in presence of differentiating agents, clearly showed the presence of oligodendrocytes, astrocytes and neurons. Glial cells were the most abundant. Sialidase Neu3 after a decrease from progenitors to precursors, showed an increase parallel to the differentiation process. All the other glycosidases increased their activity along differentiation. The activity of CBE-sensitive β-glucosidase and GBA2 were very similar at the precursor stage, but CBE-sensitive β-glucosidase increased 7 times while GBA2 only two in the differentiated cells. In addition, we analysed also sphingomyelinase as enzyme specifically associated to sphingolipids. The activity of this enzyme increased from precursors to differentiated cells.
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Affiliation(s)
- Massimo Aureli
- Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, Via Fratelli Cervi 93, 20090 Segrate, Italy
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Prinetti A, Prioni S, Chiricozzi E, Schuchman EH, Chigorno V, Sonnino S. Secondary Alterations of Sphingolipid Metabolism in Lysosomal Storage Diseases. Neurochem Res 2011; 36:1654-68. [DOI: 10.1007/s11064-010-0380-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/20/2010] [Indexed: 12/20/2022]
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Role of Gangliosides and Plasma Membrane-Associated Sialidase in the Process of Cell Membrane Organization. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2011; 705:297-316. [DOI: 10.1007/978-1-4419-7877-6_14] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Prinetti A, Prioni S, Loberto N, Aureli M, Nocco V, Illuzzi G, Mauri L, Valsecchi M, Chigorno V, Sonnino S. Aberrant glycosphingolipid expression and membrane organization in tumor cells: consequences on tumor-host interactions. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2011; 705:643-67. [PMID: 21618134 DOI: 10.1007/978-1-4419-7877-6_34] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Alessandro Prinetti
- Department of Medical Chemistry, Biochemistry and Biotechnology, Center of Excellence on Neurodegenerative Diseases, University of Milan, Via Fratelli Cervi 93, 20090 Segrate, Milano, Italy.
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Toni M, Spisni E, Griffoni C, Santi S, Riccio M, Lenaz P, Tomasi V. Cellular prion protein and caveolin-1 interaction in a neuronal cell line precedes Fyn/Erk 1/2 signal transduction. J Biomed Biotechnol 2010; 2006:69469. [PMID: 17489019 PMCID: PMC1559926 DOI: 10.1155/jbb/2006/69469] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
It has been reported that cellular prion protein (PrPc) is enriched in caveolae or caveolae-like domains with caveolin-1 (Cav-1)
participating to signal transduction events by Fyn kinase recruitment. By using the Glutathione-S-transferase (GST)-fusion proteins
assay, we observed that PrPc strongly interacts in vitro with Cav-1. Thus, we ascertained the PrPc caveolar localization in a
hypothalamic neuronal cell line (GN11), by confocal microscopy analysis, flotation on density gradient, and coimmunoprecipitation
experiments. Following the anti-PrPc antibody-mediated stimulation of live GN11 cells, we observed that PrPc clustered on
plasma membrane domains rich in Cav-1 in which Fyn kinase converged to be activated. After these events, a signaling cascade
through p42/44 MAP kinase (Erk 1/2) was triggered, suggesting that following translocations from rafts to caveolae or caveolaelike
domains PrPc could interact with Cav-1 and induce signal transduction events.
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Affiliation(s)
- Mattia Toni
- Department of Experimental Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy
| | - Enzo Spisni
- Department of Experimental Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy
| | - Cristiana Griffoni
- Department of Experimental Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy
| | - Spartaco Santi
- National Research Council, Institute of Cytomorphology, 40136 Bologna, Italy
| | - Massimo Riccio
- National Research Council, Institute of Cytomorphology, 40136 Bologna, Italy
| | - Patrizia Lenaz
- Department of Experimental Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy
| | - Vittorio Tomasi
- Department of Experimental Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy
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Piccinini M, Scandroglio F, Prioni S, Buccinnà B, Loberto N, Aureli M, Chigorno V, Lupino E, DeMarco G, Lomartire A, Rinaudo MT, Sonnino S, Prinetti A. Deregulated sphingolipid metabolism and membrane organization in neurodegenerative disorders. Mol Neurobiol 2010; 41:314-40. [PMID: 20127207 DOI: 10.1007/s12035-009-8096-6] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2009] [Accepted: 12/22/2009] [Indexed: 12/13/2022]
Abstract
Sphingolipids are polar membrane lipids present as minor components in eukaryotic cell membranes. Sphingolipids are highly enriched in nervous cells, where they exert important biological functions. They deeply affect the structural and geometrical properties and the lateral order of cellular membranes, modulate the function of several membrane-associated proteins, and give rise to important intra- and extracellular lipid mediators. Sphingolipid metabolism is regulated along the differentiation and development of the nervous system, and the expression of a peculiar spatially and temporarily regulated sphingolipid pattern is essential for the maintenance of the functional integrity of the nervous system: sphingolipids in the nervous system participate to several signaling pathways controlling neuronal survival, migration, and differentiation, responsiveness to trophic factors, synaptic stability and synaptic transmission, and neuron-glia interactions, including the formation and stability of central and peripheral myelin. In several neurodegenerative diseases, sphingolipid metabolism is deeply deregulated, leading to the expression of abnormal sphingolipid patterns and altered membrane organization that participate to several events related to the pathogenesis of these diseases. The most impressive consequence of this deregulation is represented by anomalous sphingolipid-protein interactions that are at least, in part, responsible for the misfolding events that cause the fibrillogenic and amyloidogenic processing of disease-specific protein isoforms, such as amyloid beta peptide in Alzheimer's disease, huntingtin in Huntington's disease, alpha-synuclein in Parkinson's disease, and prions in transmissible encephalopathies. Targeting sphingolipid metabolism represents today an underexploited but realistic opportunity to design novel therapeutic strategies for the intervention in these diseases.
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Affiliation(s)
- Marco Piccinini
- Section of Biochemistry, Department of Medicine and Experimental Oncology, University of Turin, Turin, Italy
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Sandro S, Alessandro P. Membrane lipid domains and membrane lipid domain preparations: are they the same thing? TRENDS GLYCOSCI GLYC 2008. [DOI: 10.4052/tigg.20.315] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Lentini D, Guzzi F, Pimpinelli F, Zaninetti R, Cassetti A, Coco S, Maggi R, Parenti M. Polarization of caveolins and caveolae during migration of immortalized neurons. J Neurochem 2007; 104:514-23. [PMID: 17986234 DOI: 10.1111/j.1471-4159.2007.05005.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
During CNS development neurons undergo directional migration to achieve their adult localizations. To study neuronal migration, we used a model cell line of immortalized murine neurons (gonadotropin-releasing hormone expressing neurons; GN11), enriched with caveolins and caveolae invaginations that show in vitro chemotaxis upon serum exposure. Cholesterol depletion with methyl-beta-cyclodextrin induced the loss of caveolae and the inhibition of chemotaxis, thus suggesting that GN11 migration depends upon the structural integrity of caveolae. Polarization of proteins and organelles is a hallmark of cell migration. Accordingly, GN11 cells transmigrating through filter pores exhibited a polarized distribution of caveolin-1 isoform (cav-1) in the leading processes. In contrast, during two-dimensional migration cav-1 and caveolae polarized at the trailing edge. As caveolae are enriched with signaling molecules, we suggest that asymmetrical localization of caveolae may spatially orient GN11 neurons to incoming migratory signals thereby transducing them into directional migration.
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Affiliation(s)
- D Lentini
- Department of Experimental Medicine, University of Milano-Bicocca, Monza, Italy
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D’Orlando C, Guzzi F, Gravati M, Biella G, Toselli M, Meneveri R, Barisani D, Parenti M. Retinoic acid- and phorbol ester-induced neuronal differentiation down-regulates caveolin expression in GnRH neurons. J Neurochem 2007; 104:1577-87. [PMID: 17988240 DOI: 10.1111/j.1471-4159.2007.05109.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Prinetti A, Chigorno V, Mauri L, Loberto N, Sonnino S. Modulation of cell functions by glycosphingolipid metabolic remodeling in the plasma membrane. J Neurochem 2007; 103 Suppl 1:113-25. [DOI: 10.1111/j.1471-4159.2007.04714.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Prinetti A, Prioni S, Loberto N, Aureli M, Chigorno V, Sonnino S. Regulation of tumor phenotypes by caveolin-1 and sphingolipid-controlled membrane signaling complexes. Biochim Biophys Acta Gen Subj 2007; 1780:585-96. [PMID: 17889439 DOI: 10.1016/j.bbagen.2007.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2007] [Revised: 07/26/2007] [Accepted: 08/02/2007] [Indexed: 12/11/2022]
Abstract
Aberrant (glyco)sphingolipid expression deeply affects several properties of tumor cells that are involved in tumor progression and metastasis formation: cell adhesion (to the extracellular matrix or to the endothelium of blood vessels), motility, recognition and invasion of host tissues. In particular, (glyco)sphingolipids might contribute to the modulation of integrin-dependent interactions of tumor cells (determining their adhesion, motility and invasiveness) with the extracellular matrix as well as with host cells present in the stromal compartment of the tumor. A model based on solid experimental evidence has been proposed: (glyco)sphingolipids at the cell surface interact with plasma membrane receptors (e.g., integrin receptors and growth factor receptors) and adapter molecules (including tetraspanins) forming signaling complexes that are able to influence the activity of signal transduction molecules oriented at the cytosolic surface of the plasma membrane (mainly the Src kinases pathway members). The function of these signaling complexes appears to be strictly dependent on their (glyco)sphingolipid composition, and likely on specific sphingolipid-protein interactions. From this point of view, particularly intriguing is the connection between (glyco)sphingolipids and caveolin-1, a membrane protein that plays multiple roles as a suppressor of tumor growth and metastasis in ovarian, breast and colon human carcinomas.
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Affiliation(s)
- Alessandro Prinetti
- Center of Excellence on Neurodegenerative Diseases, Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, 20090 Segrate, Italy.
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Pimpinelli F, Lehmann S, Maridonneau-Parini I. The scrapie prion protein is present in flotillin-1-positive vesicles in central- but not peripheral-derived neuronal cell lines. Eur J Neurosci 2005; 21:2063-72. [PMID: 15869502 DOI: 10.1111/j.1460-9568.2005.04049.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Abstract Transmissible prion diseases are fatal neurodegenerative diseases associated with the conversion of the normal host prion protein (PrP c) into an abnormal isoform (PrP Sc) that accumulates in brain. This pathology affects neurons of the central nervous system whereas no clear toxic effect has been reported for peripheral neurons. We examined the subcellular distribution of PrP c and PrP Sc in the scrapie-infected mouse neuronal cell lines GT1-7 and N2a, derived, respectively, from the central and peripheral nervous system. We observed that in both cell types, PrP c is present in the endocytic compartment, mainly in LAMP-1-positive late endosomes, but excluded from LYAAT-1-lysosomes. In contrast, PrP Sc was distributed differently in the two cell lines. In infected N2a, PrP Sc and PrP c had comparable distribution patterns. In infected GT1-7, PrP Sc is present in an additional vesicular compartment which is flotillin-1-positive. The level of expression of flotillin-1 is higher in GT1-7 than in N2a cells, but no difference is observed between infected and noninfected cells. In Alzheimer's disease patients, it has been reported that flotillin-1 is abundant in brain areas containing the beta-amyloid protein, which accumulates in endosomal vesicles in primary neurons. We propose that the flotillin compartment could store aggregated proteins and play a role in these neurodegenerative pathologies.
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Affiliation(s)
- Federica Pimpinelli
- Institut de Pharmacologie et Biologie Structurale, Unité Mixte de Recherche 5089-Centre National de la Recherche Scientifique et Université Paul Sabatier, 205 route de Narbonne, 31077 Toulouse, France
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Givens ML, Rave-Harel N, Goonewardena VD, Kurotani R, Berdy SE, Swan CH, Rubenstein JLR, Robert B, Mellon PL. Developmental regulation of gonadotropin-releasing hormone gene expression by the MSX and DLX homeodomain protein families. J Biol Chem 2005; 280:19156-65. [PMID: 15743757 PMCID: PMC2932481 DOI: 10.1074/jbc.m502004200] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Gonadotropin-releasing hormone (GnRH) is the central regulator of the hypothalamic-pituitary-gonadal axis, controlling sexual maturation and fertility in diverse species from fish to humans. GnRH gene expression is limited to a discrete population of neurons that migrate through the nasal region into the hypothalamus during embryonic development. The GnRH regulatory region contains four conserved homeodomain binding sites (ATTA) that are essential for basal promoter activity and cell-specific expression of the GnRH gene. MSX and DLX are members of the Antennapedia class of non-Hox homeodomain transcription factors that regulate gene expression and influence development of the craniofacial structures and anterior forebrain. Here, we report that expression patterns of the Msx and Dlx families of homeodomain transcription factors largely coincide with the migratory route of GnRH neurons and co-express with GnRH in neurons during embryonic development. In addition, MSX and DLX family members bind directly to the ATTA consensus sequences and regulate transcriptional activity of the GnRH promoter. Finally, mice lacking MSX1 or DLX1 and 2 show altered numbers of GnRH-expressing cells in regions where these factors likely function. These findings strongly support a role for MSX and DLX in contributing to spatiotemporal regulation of GnRH transcription during development.
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Affiliation(s)
- Marjory L. Givens
- Departments of Reproductive Medicine and Neuroscience, University of California, San Diego, La Jolla, California 92093-0674
| | - Naama Rave-Harel
- Departments of Reproductive Medicine and Neuroscience, University of California, San Diego, La Jolla, California 92093-0674
| | - Vinodha D. Goonewardena
- Departments of Reproductive Medicine and Neuroscience, University of California, San Diego, La Jolla, California 92093-0674
| | - Reiko Kurotani
- Departments of Reproductive Medicine and Neuroscience, University of California, San Diego, La Jolla, California 92093-0674
| | - Sara E. Berdy
- Departments of Reproductive Medicine and Neuroscience, University of California, San Diego, La Jolla, California 92093-0674
| | - Christo H. Swan
- Department of Psychiatry and Langley Porter Psychiatric Institute, University of California, San Francisco, San Francisco, California 9414-0984
| | - John L. R. Rubenstein
- Department of Psychiatry and Langley Porter Psychiatric Institute, University of California, San Francisco, San Francisco, California 9414-0984
| | - Benoit Robert
- Unite de Genetique Moleculaire de la Morphogenese, Institut Pasteur, URA 2578 du CNRS, 25 rue du Dr Roux, 75724 Paris Cedex 15, France
| | - Pamela L. Mellon
- Departments of Reproductive Medicine and Neuroscience, University of California, San Diego, La Jolla, California 92093-0674
- To whom correspondence should be addressed: Dept. of Reproductive Medicine, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0674. Tel.: 858-534-1312; Fax: 858-534-1438;
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Lai HH, Boone TB, Yang G, Smith CP, Kiss S, Thompson TC, Somogyi GT. Loss of caveolin-1 expression is associated with disruption of muscarinic cholinergic activities in the urinary bladder. Neurochem Int 2004; 45:1185-93. [PMID: 15380628 DOI: 10.1016/j.neuint.2004.06.016] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2004] [Accepted: 06/14/2004] [Indexed: 10/26/2022]
Abstract
Caveolin-1 (Cav1), a structural protein of caveolae, plays cell- and context-dependent roles in signal transduction pathway regulation. We have generated a knockout mouse homozygous for a null mutation of the Cav1 gene. Cav1 knockout mice exhibited impaired urinary bladder contractions in vivo during cystometry. Contractions of male bladder strips were evoked with electric and pharmacologic stimulation (5-40 Hz, 1-10 microM carbachol, 10 mM alpha,beta-methylene ATP, 100 mM KCl). Acetylcholine (ACh) and norepinephrine (NE) release from bladder strips were measured with a radiochemical method by incubating the strips with 14C-choline and 3H-NE prior to electric stimulation, whereas ATP release was measured using the luciferin-luciferase assay with a luminometer. A 60-75% decline in contractility was observed when Cav1 knockout muscle strips were stimulated with electric current or carbachol, compared to wildtype muscle strips. No difference in contractility was noted when contractions were evoked either by the purinergic agonist alpha,beta-methylene ATP, or by extracellular potassium. To investigate the relative contribution of non-cholinergic activity to bladder contractility, the amplitude of the electric stimulation-evoked contractions was compared in the presence of the muscarinic antagonist atropine (1 microM). While the non-muscarinic (purinergic) response was unaltered, muscarinic cholinergic response was principally disrupted in Cav1 knockout mice. The loss of Cav1 gene expression was also associated with a 70% reduction in ACh release. NE and ATP release was not altered. It is concluded that the loss of caveolin-1 is associated with disruption of M3 muscarinic cholinergic activity in the bladder. Both pre-junctional (acetylcholine neurotransmitter release from neuromuscular junctions) and post-junctional (M3 receptor-mediated signal transduction in bladder smooth muscles) mechanisms are disrupted, resulting in impaired bladder contraction.
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Affiliation(s)
- H Henry Lai
- Neurourology Laboratory, Scott Department of Urology, Baylor College of Medicine, Houston, TX 77030, USA
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Colombaioni L, Garcia-Gil M. Sphingolipid metabolites in neural signalling and function. ACTA ACUST UNITED AC 2004; 46:328-55. [PMID: 15571774 DOI: 10.1016/j.brainresrev.2004.07.014] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2004] [Indexed: 11/20/2022]
Abstract
Sphingolipid metabolites, such as ceramide, sphingosine, sphingosine-1-phosphate (S1P) and complex sphingolipids (gangliosides), are recognized as molecules capable of regulating a variety of cellular processes. The role of sphingolipid metabolites has been studied mainly in non-neuronal tissues. These studies have underscored their importance as signals transducers, involved in control of proliferation, survival, differentiation and apoptosis. In this review, we will focus on studies performed over the last years in the nervous system, discussing the recent developments and the current perspectives in sphingolipid metabolism and functions.
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Schneider B, Mutel V, Pietri M, Ermonval M, Mouillet-Richard S, Kellermann O. NADPH oxidase and extracellular regulated kinases 1/2 are targets of prion protein signaling in neuronal and nonneuronal cells. Proc Natl Acad Sci U S A 2003; 100:13326-31. [PMID: 14597699 PMCID: PMC263804 DOI: 10.1073/pnas.2235648100] [Citation(s) in RCA: 151] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Putative functions of the cellular prion protein, PrPC, include resistance to oxidative stress, copper uptake, cell adhesion, and cell signaling. Here, we report NADPH oxidase-dependent reactive oxygen species (ROS) production and extracellular regulated kinases 1/2 (ERK1/2) phosphorylation on PrPC stimulation in the 1C11 neuroectodermal precursor, in its neuronal differentiated progenies, and in GT1-7 neurohypothalamic and BW5147 lymphoid cells. In neuroprogenitor, hypothalamic, and lymphoid cells, ERK1/2 activation is fully controlled by the NADPH oxidase-dependent ROS production. In 1C11-derived bioaminergic cells, ROS signaling and ERK1/2 phosphorylation are both controlled by Fyn kinase activation, introducing some specificity in PrPC transduction associated with this neuronal context. These data argue for an ubiquitous function of PrPC in cell-redox homeostasis through ROS production.
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Affiliation(s)
- Benoît Schneider
- Différenciation Cellulaire et Prions, Centre National de la Recherche Scientifique Unité Propre de Recherche 1983, Institut André Lwoff, 7 Rue Guy Môquet, BP8, 94 801 Villejuif Cedex, France
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Ottico E, Prinetti A, Prioni S, Giannotta C, Basso L, Chigorno V, Sonnino S. Dynamics of membrane lipid domains in neuronal cells differentiated in culture. J Lipid Res 2003; 44:2142-51. [PMID: 12897192 DOI: 10.1194/jlr.m300247-jlr200] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Treatment with methyl-beta-cyclodextrin (MCD) induced a time- and dose-dependent efflux of cholesterol, sphingolipids, and phosphatidylcholine (PC) from cerebellar neurons differentiated in culture. With a "mild" treatment, the loss of cell lipids induced a deep reorganization of the remaining membrane lipids. In fact, the amount of PC associated with a Triton X-100-insoluble membrane fraction (highly enriched in sphingolipids and cholesterol in nontreated cells) was lowered by the treatment. This suggested a reduction of the lipid domain area. However, the cholesterol and sphingolipid enrichment of this fraction remained substantially unchanged, suggesting the existence of dynamic processes aimed at preserving the segregation of cholesterol and sphingolipids in membrane domains. Under these conditions, the lipid membrane domains retained the ability to sort signaling proteins, such as Lyn and c-Src, but cells displayed deep alterations in their membrane permeability. However, normal membrane permeability was restored by loading cells with cholesterol. When MCD treatment was more stringent, a large loss of cell lipids occurred, and the lipid domains were much less enriched in cholesterol and lost the ability to sort specific proteins. The loss of the integrity and properties of lipid domains was accompanied by severe changes in the membrane permeability, distress, and eventually cell death.
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Affiliation(s)
- Elena Ottico
- Department of Medical Chemistry, Biochemistry, and Biotechnology, Center of Excellence on Neurodegenerative Diseases, University of Milan, Segrate, Italy
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Pimpinelli F, Redaelli E, Restano-Cassulini R, Curia G, Giacobini P, Cariboni A, Wanke E, Bondiolotti GP, Piva F, Maggi R. Depolarization differentially affects the secretory and migratory properties of two cell lines of immortalized luteinizing hormone-releasing hormone (LHRH) neurons. Eur J Neurosci 2003; 18:1410-8. [PMID: 14511321 DOI: 10.1046/j.1460-9568.2003.02866.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this report we studied and compared the biochemical and the electrophysiological characteristics of two cell lines (GT1-7 and GN11) of immortalized mouse LHRH-expressing neurons and the correlation with their maturational stage and migratory activity. In fact, previous results indicated that GN11, but not GT1-7, cells exhibit an elevated motility in vitro. The results show that the two cell lines differ in terms of immunoreactivity for tyrosine hydroxylase and nestin as well as of production and release of 3,4-dihydroxyphenylalanine (DOPA) and of intracellular distribution and release of the LHRH. Patch-clamp recordings in GN11 cells, reveal the presence of a single inward rectifier K+ current indicative of an immature neuronal phenotype (neither firing nor electrical activity). In contrast, as known from previous studies, GT1-7 cells show the characteristics of mature LHRH neurons with a high electrical activity characterized by spontaneous firing and excitatory postsynaptic potentials. K+-induced depolarization induces in GT1-7 cells, but not in GN11 cells, a strong increase in the release of LHRH in the culture medium. However, depolarization of GN11 cells significantly decreases their chemomigratory response. In conclusion, these results indicate that GT1-7 and GN11 cells show different biochemical and electrophysiological characteristics and are representative of mature and immature LHRH neurons, respectively. The early stage of maturation of GN11 cells, as well as the low electrical activity detected in these cells, appears to correlate with their migratory activity in vitro.
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Affiliation(s)
- Federica Pimpinelli
- Laboratory of Developmental Neuroendocrinology, Department of Endocrinology, Center of Excellence on Neurodegenerative Diseases, University of Milano, Via G. Balzaretti, 9, 20133 Milan, Italy
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