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Abstract
The formation of membrane vesicles is a common feature in all eukaryotes. Lipid rafts are the best-studied example of membrane domains for both eukaryotes and prokaryotes, and their existence also is suggested in Archaea membranes. Lipid rafts are involved in the formation of transport vesicles, endocytic vesicles, exocytic vesicles, synaptic vesicles and extracellular vesicles, as well as enveloped viruses. Two mechanisms of how rafts are involved in vesicle formation have been proposed: first, that raft proteins and/or lipids located in lipid rafts associate with coat proteins that form a budding vesicle, and second, vesicle budding is triggered by enzymatic generation of cone-shaped ceramides and inverted cone-shaped lyso-phospholipids. In both cases, induction of curvature is also facilitated by the relaxation of tension in the raft domain. In this Review, we discuss the role of raft-derived vesicles in several intracellular trafficking pathways. We also highlight their role in different pathways of endocytosis, and in the formation of intraluminal vesicles (ILVs) through budding inwards from the multivesicular body (MVB) membrane, because rafts inside MVB membranes are likely to be involved in loading RNA into ILVs. Finally, we discuss the association of glycoproteins with rafts via the glycocalyx.
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Affiliation(s)
- Karolina Sapoń
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland
| | - Rafał Mańka
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland
| | - Teresa Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland
| | - Tadeusz Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland
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Sui D, Liang K, Gui Y, Du Z, Xin D, Yu G, Zhai W, Liu X, Song Y, Deng Y. Optimization design of sialic acid derivatives enhances the performance of liposomes for modulating immunosuppressive tumor microenvironments. Life Sci 2022; 310:121081. [DOI: 10.1016/j.lfs.2022.121081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 10/06/2022] [Accepted: 10/11/2022] [Indexed: 11/05/2022]
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González-Cebrián A, Almenar-Pérez E, Xu J, Yu T, Huang WE, Giménez-Orenga K, Hutchinson S, Lodge T, Nathanson L, Morten KJ, Ferrer A, Oltra E. Diagnosis of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome With Partial Least Squares Discriminant Analysis: Relevance of Blood Extracellular Vesicles. Front Med (Lausanne) 2022; 9:842991. [PMID: 35433768 PMCID: PMC9011062 DOI: 10.3389/fmed.2022.842991] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 02/21/2022] [Indexed: 12/25/2022] Open
Abstract
Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), a chronic disease characterized by long-lasting persistent debilitating widespread fatigue and post-exertional malaise, remains diagnosed by clinical criteria. Our group and others have identified differentially expressed miRNA profiles in the blood of patients. However, their diagnostic power individually or in combinations seems limited. A Partial Least Squares-Discriminant Analysis (PLS-DA) model initially based on 817 variables: two demographic, 34 blood analytic, 136 PBMC miRNAs, 639 Extracellular Vesicle (EV) miRNAs, and six EV features, selected an optimal number of five components, and a subset of 32 regressors showing statistically significant discriminant power. The presence of four EV-features (size and z-values of EVs prepared with or without proteinase K treatment) among the 32 regressors, suggested that blood vesicles carry relevant disease information. To further explore the features of ME/CFS EVs, we subjected them to Raman micro-spectroscopic analysis, identifying carotenoid peaks as ME/CFS fingerprints, possibly due to erythrocyte deficiencies. Although PLS-DA analysis showed limited capacity of Raman fingerprints for diagnosis (AUC = 0.7067), Raman data served to refine the number of PBMC miRNAs from our previous model still ensuring a perfect classification of subjects (AUC=1). Further investigations to evaluate model performance in extended cohorts of patients, to identify the precise ME/CFS EV components detected by Raman and to reveal their functional significance in the disease are warranted.
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Affiliation(s)
- Alba González-Cebrián
- Grupo de Ingeniería Estadística Multivariante, Departamento de Estadística e Investigación Operativa Aplicadas y Calidad, Universitat Politècnica de València, Valencia, Spain
| | - Eloy Almenar-Pérez
- Department of Pathology, School of Health Sciences, Universidad Católica de Valencia San Vicente Mártir, Valencia, Spain
- Nuffield Department of Women's and Reproductive Health, The Women Centre, University of Oxford, Oxford, United Kingdom
| | - Jiabao Xu
- Department of Engineering Science, University of Oxford, Oxford, United Kingdom
| | - Tong Yu
- Department of Engineering Science, University of Oxford, Oxford, United Kingdom
| | - Wei E. Huang
- Department of Engineering Science, University of Oxford, Oxford, United Kingdom
| | - Karen Giménez-Orenga
- Escuela de Doctorado, Universidad Católica de Valencia San Vicente Mártir, Valencia, Spain
| | - Sarah Hutchinson
- Nuffield Department of Women's and Reproductive Health, The Women Centre, University of Oxford, Oxford, United Kingdom
| | - Tiffany Lodge
- Nuffield Department of Women's and Reproductive Health, The Women Centre, University of Oxford, Oxford, United Kingdom
| | - Lubov Nathanson
- Kiran C. Patel College of Osteopathic Medicine, Nova Southeastern University, Fort Lauderdale, FL, United States
- Institute for Neuro Immune Medicine, Nova Southeastern University, Fort Lauderdale, FL, United States
| | - Karl J. Morten
- Nuffield Department of Women's and Reproductive Health, The Women Centre, University of Oxford, Oxford, United Kingdom
| | - Alberto Ferrer
- Grupo de Ingeniería Estadística Multivariante, Departamento de Estadística e Investigación Operativa Aplicadas y Calidad, Universitat Politècnica de València, Valencia, Spain
| | - Elisa Oltra
- Department of Pathology, School of Health Sciences, Universidad Católica de Valencia San Vicente Mártir, Valencia, Spain
- Centro de Investigación Traslacional San Alberto Magno, Universidad Católica de Valencia San Vicente Mártir, Valencia, Spain
- *Correspondence: Elisa Oltra ; orcid.org/0000-0003-0598-2907
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Mańka R, Janas P, Sapoń K, Janas T, Janas T. Role of RNA Motifs in RNA Interaction with Membrane Lipid Rafts: Implications for Therapeutic Applications of Exosomal RNAs. Int J Mol Sci 2021; 22:9416. [PMID: 34502324 PMCID: PMC8431113 DOI: 10.3390/ijms22179416] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/23/2021] [Accepted: 08/26/2021] [Indexed: 02/07/2023] Open
Abstract
RNA motifs may promote interactions with exosomes (EXO-motifs) and lipid rafts (RAFT-motifs) that are enriched in exosomal membranes. These interactions can promote selective RNA loading into exosomes. We quantified the affinity between RNA aptamers containing various EXO- and RAFT-motifs and membrane lipid rafts in a liposome model of exosomes by determining the dissociation constants. Analysis of the secondary structure of RNA molecules provided data about the possible location of EXO- and RAFT-motifs within the RNA structure. The affinity of RNAs containing RAFT-motifs (UUGU, UCCC, CUCC, CCCU) and some EXO-motifs (CCCU, UCCU) to rafted liposomes is higher in comparison to aptamers without these motifs, suggesting direct RNA-exosome interaction. We have confirmed these results through the determination of the dissociation constant values of exosome-RNA aptamer complexes. RNAs containing EXO-motifs GGAG or UGAG have substantially lower affinity to lipid rafts, suggesting indirect RNA-exosome interaction via RNA binding proteins. Bioinformatics analysis revealed RNA aptamers containing both raft- and miRNA-binding motifs and involvement of raft-binding motifs UCCCU and CUCCC. A strategy is proposed for using functional RNA aptamers (fRNAa) containing both RAFT-motif and a therapeutic motif (e.g., miRNA inhibitor) to selectively introduce RNAs into exosomes for fRNAa delivery to target cells for personalized therapy.
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Affiliation(s)
- Rafał Mańka
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (R.M.); (K.S.); (T.J.)
| | - Pawel Janas
- Kellogg School of Management, Northwestern University, Evanston, IL 60208, USA;
| | - Karolina Sapoń
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (R.M.); (K.S.); (T.J.)
| | - Teresa Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (R.M.); (K.S.); (T.J.)
| | - Tadeusz Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (R.M.); (K.S.); (T.J.)
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Mindler K, Ostertag E, Stehle T. The polyfunctional polysialic acid: A structural view. Carbohydr Res 2021; 507:108376. [PMID: 34273862 DOI: 10.1016/j.carres.2021.108376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 06/09/2021] [Accepted: 06/09/2021] [Indexed: 12/15/2022]
Abstract
Polysialic acid (polySia), a homopolymer of α2,8-linked sialic acid residues, modifies a small number of proteins and has central functions in vertebrate signalling. Here, we review the regulatory functions of polySia in signalling processes and the immune system of adult humans, as well as functions based on their chemical properties. The main focus will be on the structure-function relationship of polySia with its interaction partners in humans. Recent studies have indicated that the degree of polymerisation is an important parameter that can guide the regulatory effect of polySia in addition to its binding to target proteins. Therefore, the structures of polySia in solution and bound to interaction partners are compared in order to identify the key factors that define binding specificity.
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Affiliation(s)
- Katja Mindler
- Interfaculty Institute of Biochemistry, University of Tübingen, 72076, Tübingen, Germany
| | - Elena Ostertag
- Interfaculty Institute of Biochemistry, University of Tübingen, 72076, Tübingen, Germany
| | - Thilo Stehle
- Interfaculty Institute of Biochemistry, University of Tübingen, 72076, Tübingen, Germany.
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Janas T, Sapoń K, Janas T, Yarus M. Specific binding of VegT mRNA localization signal to membranes in Xenopus oocytes. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2021; 1868:118952. [PMID: 33422615 DOI: 10.1016/j.bbamcr.2021.118952] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 12/18/2020] [Accepted: 12/30/2020] [Indexed: 10/22/2022]
Abstract
We have studied the interaction of a VegT mRNA localization signal sequence with the membranes of the mitochondrial cloud in Xenopus oocytes, and the binding of the VegT mRNA signal sequence to the lipid raft regions of the vesicles bounded by ordered and disordered phospholipid bilayers. RNA preference for the membranes of the mitochondrial cloud was confirmed using microscopy of a fluorescence resonance energy transfer from RNA molecules to membranes. Our studies show that VegT mRNA has a higher affinity for ordered regions of lipid bilayers. This conclusion is supported by the dissociation constant measurements for RNA-liposome complex and the visualization of the FRET signal between giant vesicles and RNA. Our data indicate that these affinities are sensitive and distinct to the location of the localization elements within the VegT mRNA localization signal structure. Therefore, specific binding of VegT mRNA localization signal sequence to membranes can be responsible for polarized distribution of VegT mRNA in Xenopus oocytes. We suggest that the mechanism of this binding can involve the interaction of the localization elements within the VegT mRNA signal sequence with lipid raft regions of the mitochondrial cloud membranes, thereby utilizing localization elements as novel lipid raft-binding RNA motifs.
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Affiliation(s)
- Tadeusz Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; Department of MCD Biology, University of Colorado, Boulder, CO 80309, USA.
| | - Karolina Sapoń
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland
| | - Teresa Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland
| | - Michael Yarus
- Department of MCD Biology, University of Colorado, Boulder, CO 80309, USA
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Binding of RNA Aptamers to Membrane Lipid Rafts: Implications for Exosomal miRNAs Transfer from Cancer to Immune Cells. Int J Mol Sci 2020; 21:ijms21228503. [PMID: 33198080 PMCID: PMC7697632 DOI: 10.3390/ijms21228503] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/08/2020] [Accepted: 11/10/2020] [Indexed: 12/15/2022] Open
Abstract
Intraluminal vesicles (ILVs) are released into the extracellular space as exosomes after the fusion of multivesicular bodies (MVBs) with the plasma membrane. miRNAs are delivered to the raft-like region of MVB by RNA-binding proteins (RBPs). RNA loading into exosomes can be either through direct interaction between RNA and the raft-like region of the MVB membrane, or through interaction between an RBP–RNA complex with this raft-like region. Selection of RNA aptamers that bind to lipid raft region of liposomal membranes was performed using the selection-amplification (SELEX) method. The pool of RNA aptamers was isolated, and the binding of this pool to lipid-raft regions was demonstrated. Sequencing of clones from rafted liposome-eluted RNAs showed sequences apparently of independent origin. Bioinformatics analysis revealed the most frequent raft-motifs present within these sequences. Four raft RNA motifs, one of them an EXO motif, have been identified. These motifs appear to be most frequent both in the case of raft RNA aptamers and in the case of exosomal pro-tumoral miRNAs transferred from cancer cells to macrophages, natural killer cells and dendritic cells, thus suggesting that the selection for incorporation of these miRNAs into ILVs is based on their affinity to the raft-like region of the MVB membrane.
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Sapoń K, Maziarz D, Janas T, Sikorski AF, Janas T. Cholera Toxin Subunit B for Sensitive and Rapid Determination of Exosomes by Gel Filtration. MEMBRANES 2020; 10:membranes10080172. [PMID: 32751790 PMCID: PMC7464461 DOI: 10.3390/membranes10080172] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 02/07/2023]
Abstract
We developed a sensitive fluorescence-based assay for determination of exosome concentration. In our assay, Cholera toxin subunit B (CTB) conjugated to a fluorescence probe and a gel filtration technique (size-exclusion chromatography) are used. Exosomal membranes are particularly enriched in raft-forming lipids (cholesterol, sphingolipids, and saturated phospholipids) and in GM1 ganglioside. CTB binds specifically and with high affinity to exosomal GM1 ganglioside residing in rafts only, and it has long been the probe of choice for membrane rafts. The CTB-gel filtration assay allows for detection of as little as 3 × 108 isolated exosomes/mL in a standard fluorometer, which has a sensitivity comparable to other methods using advanced instrumentation. The linear quantitation range for CTB-gel filtration assay extends over one order of magnitude in exosome concentration. Using 80 nM fluorescence-labeled CTB, we quantitated 3 × 108 to 6 × 109 exosomes/mL. The assay ranges exhibited linear fluorescence increases versus exosome concentration (r2 = 0.987). The assay was verified for exosomal liposomes. The assay is easy to use, rapid, and does not require any expensive or sophisticated instrumentation.
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Affiliation(s)
- Karolina Sapoń
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (K.S.); (D.M.); (T.J.)
| | - Dominika Maziarz
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (K.S.); (D.M.); (T.J.)
| | - Teresa Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (K.S.); (D.M.); (T.J.)
| | - Aleksander F. Sikorski
- Research and Development Center, Regional Specialist Hospital, 51-124 Wroclaw, Poland;
- Department of Cytobiochemistry, Faculty of Biotechnology, University of Wrocław, 50-383 Wrocław, Poland
| | - Tadeusz Janas
- Institute of Biology, University of Opole, Kominka 6, 45-032 Opole, Poland; (K.S.); (D.M.); (T.J.)
- Correspondence: ; Tel.: +48-77-4016050; Fax: +48-77-4016051
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