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Ross JM, Olson L, Coppotelli G. Mitochondrial Dysfunction and Protein Homeostasis in Aging: Insights from a Premature-Aging Mouse Model. Biomolecules 2024; 14:162. [PMID: 38397399 PMCID: PMC10886786 DOI: 10.3390/biom14020162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/10/2024] [Accepted: 01/22/2024] [Indexed: 02/25/2024] Open
Abstract
Mitochondrial dysfunction has been implicated in aging and age-related disorders. Disturbed-protein homeostasis and clearance of damaged proteins have also been linked to aging, as well as to neurodegenerative diseases, cancers, and metabolic disorders. However, since mitochondrial oxidative phosphorylation, ubiquitin-proteasome, and autophagy-lysosome systems are tightly interdependent, it is not understood whether the facets observed in aging are the causes or consequences of one or all of these failed processes. We therefore used prematurely aging mtDNA-mutator mice and normally aging wild-type littermates to elucidate whether mitochondrial dysfunction per se is sufficient to impair cellular protein homeostasis similarly to that which is observed in aging. We found that both mitochondrial dysfunction and normal aging affect the ubiquitin-proteasome system in a tissue-dependent manner, whereas only normal aging markedly impairs the autophagy-lysosome system. Thus, our data show that the proteostasis network control in the prematurely aging mtDNA-mutator mouse differs in certain aspects from that found in normal aging. Taken together, our findings suggest that severe mitochondrial dysfunction drives an aging phenotype associated with the impairment of certain components of the protein homeostasis machinery, while others, such as the autophagy-lysosome system, are not affected or only minimally affected. Taken together, this shows that aging is a multifactorial process resulting from alterations of several integrated biological processes; thus, manipulating one process at the time might not be sufficient to fully recapitulate all changes associated with normal aging.
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Affiliation(s)
- Jaime M. Ross
- George and Anne Ryan Institute for Neuroscience, University of Rhode Island, Kingston, RI 02881, USA
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA
| | - Lars Olson
- Department of Neuroscience, Karolinska Institutet, S-17177 Stockholm, Sweden;
| | - Giuseppe Coppotelli
- George and Anne Ryan Institute for Neuroscience, University of Rhode Island, Kingston, RI 02881, USA
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA
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Yang J, Rong SJ, Zhou HF, Yang C, Sun F, Li JY. Lysosomal control of dendritic cell function. J Leukoc Biol 2023; 114:518-531. [PMID: 37774493 DOI: 10.1093/jleuko/qiad117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/22/2023] [Accepted: 09/08/2023] [Indexed: 10/01/2023] Open
Abstract
Lysosomal compartments undergo extensive remodeling during dendritic cell (DC) activation to meet the dynamic functional requirements of DCs. Instead of being regarded as stationary and digestive organelles, recent studies have increasingly appreciated the versatile roles of lysosomes in regulating key aspects of DC biology. Lysosomes actively control DC motility by linking calcium efflux to the actomyosin contraction, while enhanced DC lysosomal membrane permeability contributes to the inflammasome activation. Besides, lysosomes provide a platform for the transduction of innate immune signaling and the intricate host-pathogen interplay. Lysosomes and lysosome-associated structures are also critically engaged in antigen presentation and cross-presentation processes, which are pivotal for the induction of antigen-specific adaptive immune response. Through the current review, we emphasize that lysosome targeting strategies serve as vital DC-based immunotherapies in fighting against tumor, infectious diseases, and autoinflammatory disorders.
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Affiliation(s)
- Jia Yang
- Department of Integrated Traditional Chinese and Western Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue No.1277, 430000, Wuhan, China
| | - Shan-Jie Rong
- Department of Respiratory and Critical Care Medicine, Center for Biomedical Research, NHC Key Laboratory of Respiratory Diseases, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Jiefang Avenue No.1095, 430000, Wuhan, China
| | - Hai-Feng Zhou
- Department of Integrated Traditional Chinese and Western Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue No.1277, 430000, Wuhan, China
| | - Chao Yang
- Department of Gerontology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Ling Jiaohu Road No.11, 430000, Wuhan, China
| | - Fei Sun
- Department of Respiratory and Critical Care Medicine, Center for Biomedical Research, NHC Key Laboratory of Respiratory Diseases, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Jiefang Avenue No.1095, 430000, Wuhan, China
| | - Jun-Yi Li
- Department of Integrated Traditional Chinese and Western Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue No.1277, 430000, Wuhan, China
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The Gly-Ala repeat modulates the interaction of Epstein-Barr virus nuclear antigen-1 with cellular chromatin. Biochem Biophys Res Commun 2013; 431:706-11. [PMID: 23348225 DOI: 10.1016/j.bbrc.2013.01.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 01/12/2013] [Indexed: 11/24/2022]
Abstract
The Epstein-Barr virus (EBV) nuclear antigen-1 (EBNA1) plays a pivotal role in EBV infection by anchoring the viral episome to cellular DNA, which regulates replication and partitioning in dividing cells. Here, we have used fluorescence recovery after photobleaching (FRAP) and fluorescence loss in photobleaching (FLIP) techniques to study the interaction of EBNA1 with cellular chromatin in interphase and mitosis. This analysis revealed that while EBNA1 is highly mobile in both conditions, mobility is significantly reduced in mitosis when an immobile fraction is also detected. The N-terminal chromatin-targeting module of EBNA1 includes two Gly-Arg rich domains (GR1 and GR2) separated by a Gly-Ala repeat (GAr) of variable length. Using a set of deletion mutants and GFP-fusion reporters, we found that the GR domains cooperatively determine the mobility of EBNA1, whereas mobility is increased by the interposed GAr in a length-dependent manner. These findings highlight a previously unrecognized property of the interaction of EBNA1 with cellular chromatin that may fine-tune its function in the maintenance of viral latency.
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Petrizzo A, Tornesello ML, Napolitano M, D'Alessio G, Salomone Megna A, Dolcetti R, De Re V, Wang E, Marincola FM, Buonaguro FM, Buonaguro L. Multiparametric analyses of human PBMCs loaded ex vivo with a candidate idiotype vaccine for HCV-related lymphoproliferative disorders. PLoS One 2012; 7:e44870. [PMID: 23028651 PMCID: PMC3445594 DOI: 10.1371/journal.pone.0044870] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 08/07/2012] [Indexed: 12/16/2022] Open
Abstract
Hepatitis C virus (HCV) has been identified as one of the major risk factors for type II mixed cryoglobulinemia (MC), during the clinical evolution of chronic hepatitis, which may lead to development of B cell non-Hodgkin's lymphoma (NHL). We have previously shown that the candidate idiotype vaccine, based on the IGKV3-20 light chain protein, is able to induce activation and maturation of circulating antigen presenting cells (APCs) in both HCV-positive and HCV-negative healthy control subjects, with production of Th2-type cytokines. Here, the effect of the recombinant IGKV3-20 protein on human peripheral blood mononuclear cells (PBMCs) from HCV-positive subjects, with known blood levels of cryoglobulins, is shown via gene expression profiling analysis combined to multiparameter flow cytometry and multiplex analyses of cytokines.
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Affiliation(s)
- Annacarmen Petrizzo
- Laboratory of Molecular Biology and Viral Oncogenesis, National Cancer Institute “Fond. G. Pascale”, Naples, Italy
| | - Maria Lina Tornesello
- Laboratory of Molecular Biology and Viral Oncogenesis, National Cancer Institute “Fond. G. Pascale”, Naples, Italy
| | - Maria Napolitano
- Laboratory of Clinical Immunology, National Cancer Institute “Fond. G. Pascale”, Naples, Italy
| | | | | | - Riccardo Dolcetti
- Cancer Bio-Immunotherapy Unit, Centro di Riferimento Oncologico, National Cancer Institute, Aviano, Italy
| | - Valli De Re
- Experimental and Clinical Pharmacology, Centro di Riferimento Oncologico, National Cancer Institute, Aviano, Italy
| | - Ena Wang
- Infectious Disease and Immunogenetics Section (IDIS), Department of Transfusion Medicine, Clinical Center, and trans-NIH Center for Human Immunology, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Franco M. Marincola
- Infectious Disease and Immunogenetics Section (IDIS), Department of Transfusion Medicine, Clinical Center, and trans-NIH Center for Human Immunology, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Franco M. Buonaguro
- Laboratory of Molecular Biology and Viral Oncogenesis, National Cancer Institute “Fond. G. Pascale”, Naples, Italy
| | - Luigi Buonaguro
- Laboratory of Molecular Biology and Viral Oncogenesis, National Cancer Institute “Fond. G. Pascale”, Naples, Italy
- * E-mail:
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