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Han S, Lv Y, Wang J, Gao M, Yuan F, Wang D. VPS-22/SNF8 regulates longevity via modulating the activity of DAF-16 in C. elegans. Biochem Biophys Res Commun 2020; 532:94-100. [PMID: 32829877 DOI: 10.1016/j.bbrc.2020.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 08/01/2020] [Indexed: 11/17/2022]
Abstract
Aging is regulated by complex signaling networks, the details of which remain poorly understood. Here, we demonstrate that VPS-22/SNF8, a component of endosomal sorting complex required for transport-II (ESCRT-II), regulates the lifespan of C. elegans. In this study we show that worms with vps-22/snf8 gene knockdown had a shorter lifespan than wild-type worms. The expression pattern of VPS-22/SNF8 in C. elegans was highly similar to that of DAF-16. Knockout of daf-16 in C. elegans shortened the worms' lifespan; however, reducing the expression of vps-22/snf8 in daf-16 null worms did not further shorten their lifespan, indicating that vps-22/snf8 and daf-16 may act in the same signaling pathway to regulate longevity. Over-expression of daf-16 rescued the short-lived phenotype of vps-22/snf8 knockdown worms. Moreover, down-regulation of vps-22/snf8 decreased the nuclear localization of DAF-16 and modulated the expression of daf-16 downstream genes that regulate longevity in C. elegans. In summary, our results indicate that vps-22/snf8 can regulate the longevity of C. elegans by partially modulating the activity of daf-16. These findings may help us to better understand the mechanisms of aging.
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Affiliation(s)
- Shanshan Han
- Medical College, China Three Gorges University, Yichang, 443002, Hubei, PR China; The Institute of Infection and Inflammation, China Three Gorges University, Yichang, 443002, Hubei, PR China
| | - Yuexia Lv
- Key Laboratory of Molecular Biophysics of Ministry of Education, College of Life Science and Technology, Center for Human Genome Research, Huazhong University of Science and Technology, 1037 Luoyu Rd., Wuhan, 430074, Hubei, PR China
| | - Jiuxiang Wang
- Experimental Center of Clinical Research, The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei, Anhui, 230031, PR China
| | - Meng Gao
- Medical College, Henan University of Science and Technology, Luoyang, Henan, PR China
| | - Fating Yuan
- Hubei Provincial Engineering Technology Research Center for Power Transmission Line, College of Electrical Engineering and New Energy, China Three Gorges University, Yichang, 443002, PR China
| | - Decheng Wang
- Medical College, China Three Gorges University, Yichang, 443002, Hubei, PR China; The Institute of Infection and Inflammation, China Three Gorges University, Yichang, 443002, Hubei, PR China.
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Chassefeyre R, Martínez-Hernández J, Bertaso F, Bouquier N, Blot B, Laporte M, Fraboulet S, Couté Y, Devoy A, Isaacs AM, Pernet-Gallay K, Sadoul R, Fagni L, Goldberg Y. Regulation of postsynaptic function by the dementia-related ESCRT-III subunit CHMP2B. J Neurosci 2015; 35:3155-73. [PMID: 25698751 PMCID: PMC4331633 DOI: 10.1523/jneurosci.0586-14.2015] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 12/23/2014] [Accepted: 01/06/2015] [Indexed: 12/14/2022] Open
Abstract
The charged multivesicular body proteins (Chmp1-7) are an evolutionarily conserved family of cytosolic proteins that transiently assembles into helical polymers that change the curvature of cellular membrane domains. Mutations in human CHMP2B cause frontotemporal dementia, suggesting that this protein may normally control some neuron-specific process. Here, we examined the function, localization, and interactions of neuronal Chmp2b. The protein was highly expressed in mouse brain and could be readily detected in neuronal dendrites and spines. Depletion of endogenous Chmp2b reduced dendritic branching of cultured hippocampal neurons, decreased excitatory synapse density in vitro and in vivo, and abolished activity-induced spine enlargement and synaptic potentiation. To understand the synaptic effects of Chmp2b, we determined its ultrastructural distribution by quantitative immuno-electron microscopy and its biochemical interactions by coimmunoprecipitation and mass spectrometry. In the hippocampus in situ, a subset of neuronal Chmp2b was shown to concentrate beneath the perisynaptic membrane of dendritic spines. In synaptoneurosome lysates, Chmp2b was stably bound to a large complex containing other members of the Chmp family, as well as postsynaptic scaffolds. The supramolecular Chmp assembly detected here corresponds to a stable form of the endosomal sorting complex required for transport-III (ESCRT-III), a ubiquitous cytoplasmic protein complex known to play a central role in remodeling of lipid membranes. We conclude that Chmp2b-containing ESCRT-III complexes are also present at dendritic spines, where they regulate synaptic plasticity. We propose that synaptic ESCRT-III filaments may function as a novel element of the submembrane cytoskeleton of spines.
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Affiliation(s)
- Romain Chassefeyre
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France
| | - José Martínez-Hernández
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France
| | - Federica Bertaso
- CNRS, UMR-5203, Institut de Génomique Fonctionnelle, F-34094 Montpellier, France, Universités de Montpellier 1 & 2, UMR-5203, F-34094 Montpellier, France, INSERM, Unité 661, F-34094 Montpellier, France
| | - Nathalie Bouquier
- CNRS, UMR-5203, Institut de Génomique Fonctionnelle, F-34094 Montpellier, France, Universités de Montpellier 1 & 2, UMR-5203, F-34094 Montpellier, France, INSERM, Unité 661, F-34094 Montpellier, France
| | - Béatrice Blot
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France
| | - Marine Laporte
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France
| | - Sandrine Fraboulet
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France
| | - Yohann Couté
- INSERM, Unité 1038, F-38054 Grenoble, France, Commissariat à l'Energie Atomique (CEA), Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV), Laboratoire de Biologie à Grande Echelle, F-38054 Grenoble, France
| | - Anny Devoy
- Department of Neurodegenerative Disease, University College London Institute of Neurology, London WC1N 3BG, United Kingdom, and
| | - Adrian M Isaacs
- Department of Neurodegenerative Disease, University College London Institute of Neurology, London WC1N 3BG, United Kingdom, and
| | - Karin Pernet-Gallay
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France
| | - Rémy Sadoul
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France,
| | - Laurent Fagni
- CNRS, UMR-5203, Institut de Génomique Fonctionnelle, F-34094 Montpellier, France, Universités de Montpellier 1 & 2, UMR-5203, F-34094 Montpellier, France, INSERM, Unité 661, F-34094 Montpellier, France
| | - Yves Goldberg
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité 836, F-38042 Grenoble, France, Université Grenoble Alpes, Grenoble Institut des Neurosciences (GIN), F-38042 Grenoble, France, CEA, iRTSV, Groupe Physiopathologie du Cytosquelette (GPC), F-38054 Grenoble, France
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O’Brien KM, Lindsay EL, Starai VJ. The Legionella pneumophila effector protein, LegC7, alters yeast endosomal trafficking. PLoS One 2015; 10:e0116824. [PMID: 25643265 PMCID: PMC4314205 DOI: 10.1371/journal.pone.0116824] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Accepted: 12/15/2014] [Indexed: 02/03/2023] Open
Abstract
The intracellular pathogen, Legionella pneumophila, relies on numerous secreted effector proteins to manipulate host endomembrane trafficking events during pathogenesis, thereby preventing fusion of the bacteria-laden phagosome with host endolysosomal compartments, and thus escaping degradation. Upon expression in the surrogate eukaryotic model Saccharomyces cerevisiae, we find that the L. pneumophila LegC7/YlfA effector protein disrupts the delivery of both biosynthetic and endocytic cargo to the yeast vacuole. We demonstrate that the effects of LegC7 are specific to the endosome:vacuole delivery pathways; LegC7 expression does not disrupt other known vacuole-directed pathways. Deletions of the ESCRT-0 complex member, VPS27, provide resistance to the LegC7 toxicity, providing a possible target for LegC7 function in vivo. Furthermore, a single amino acid substitution in LegC7 abrogates both its toxicity and ability to alter endosomal traffic in vivo, thereby identifying a critical functional domain. LegC7 likely inhibits endosomal trafficking during L. pneumophila pathogenesis to prevent entry of the phagosome into the endosomal maturation pathway and eventual fusion with the lysosome.
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Affiliation(s)
- Kevin M. O’Brien
- Department of Microbiology, University of Georgia, Athens, Georgia, Unites States of America
| | - Elizabeth L. Lindsay
- Department of Microbiology, University of Georgia, Athens, Georgia, Unites States of America
| | - Vincent J. Starai
- Department of Microbiology, University of Georgia, Athens, Georgia, Unites States of America
- Department of Infectious Diseases, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
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