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Tam S, Wear D, Morrone CD, Yu WH. The complexity of extracellular vesicles: Bridging the gap between cellular communication and neuropathology. J Neurochem 2024; 168:2391-2422. [PMID: 38650384 DOI: 10.1111/jnc.16108] [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: 01/14/2024] [Revised: 03/12/2024] [Accepted: 03/31/2024] [Indexed: 04/25/2024]
Abstract
Brain-derived extracellular vesicles (EVs) serve a prominent role in maintaining homeostasis and contributing to pathology in health and disease. This review establishes a crucial link between physiological processes leading to EV biogenesis and their impacts on disease. EVs are involved in the clearance and transport of proteins and nucleic acids, responding to changes in cellular processes associated with neurodegeneration, including autophagic disruption, organellar dysfunction, aging, and other cell stresses. In neurodegenerative disorders (e.g., Alzheimer's disease, Parkinson's disease, etc.), EVs contribute to the spread of pathological proteins like amyloid β, tau, ɑ-synuclein, prions, and TDP-43, exacerbating neurodegeneration and accelerating disease progression. Despite evidence for both neuropathological and neuroprotective effects of EVs, the mechanistic switch between their physiological and pathological functions remains elusive, warranting further research into their involvement in neurodegenerative disease. Moreover, owing to their innate ability to traverse the blood-brain barrier and their ubiquitous nature, EVs emerge as promising candidates for novel diagnostic and therapeutic strategies. The review uniquely positions itself at the intersection of EV cell biology, neurophysiology, and neuropathology, offering insights into the diverse biological roles of EVs in health and disease.
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Affiliation(s)
- Stephanie Tam
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Darcy Wear
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Christopher D Morrone
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
| | - Wai Haung Yu
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
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Romanò S, Nele V, Campani V, De Rosa G, Cinti S. A comprehensive guide to extract information from extracellular vesicles: a tutorial review towards novel analytical developments. Anal Chim Acta 2024; 1302:342473. [PMID: 38580402 DOI: 10.1016/j.aca.2024.342473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 04/07/2024]
Abstract
In the medical field, extracellular vesicles (EVs) are gaining importance as they act as cells mediators. These are phospholipid bilayer vesicles and contain crucial biochemical information about their mother cells being carrier of different biomolecules such as small molecules, proteins, lipids, and nucleic acids. After release into the extracellular matrix, they enter the systemic circulation and can be found in all human biofluids. Since EVs reflect the state of the cell of origin, there is exponential attention as potential source of new circulating biomarkers for liquid biopsy. The use of EVs in clinical practice faces several challenges that need to be addressed: these include the standardization of lysis protocols, the availability of low-cost reagents and the development of analytical tools capable of detecting biomarkers. The process of lysis is a crucial step that can impact all subsequent analyses, towards the development of novel analytical strategies. To aid researchers to support the evolution of measurement science technology, this tutorial review evaluates and discuss the most commonly protocols used to characterize the contents of EVs, including their advantages and disadvantages in terms of experimental procedures, time and equipment. The purpose of this tutorial review is to offer practical guide to researchers which are intended to develop novel analytical approaches. Some of the most significant applications are considered, highlighting their main characteristics divided per mechanism of action. Finally, comprehensive tables which provide an overview at a glance are provided to readers.
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Affiliation(s)
- Sabrina Romanò
- Department of Pharmacy, University of Naples Federico II, Italy.
| | - Valeria Nele
- Department of Pharmacy, University of Naples Federico II, Italy
| | | | | | - Stefano Cinti
- Department of Pharmacy, University of Naples Federico II, Italy.
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3
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Xiong M, Wang Q, Zhang X, Wen L, Zhao A. Decidual stromal cells-derived exosomes incurred insufficient migration and invasion of trophoblast by disturbing of β-TrCP-mediated snail ubiquitination and degradation in unexplained recurrent spontaneous abortion. Eur J Med Res 2024; 29:39. [PMID: 38195659 PMCID: PMC10775448 DOI: 10.1186/s40001-023-01598-2] [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: 09/14/2022] [Accepted: 12/15/2023] [Indexed: 01/11/2024] Open
Abstract
BACKGROUND Exosomes released from decidual stromal cells (DSC-exos) play a crucial role in facilitating the epithelial-mesenchymal transition (EMT) of trophoblasts and insufficient trophoblasts EMT are associated with URSA (unexplained recurrent spontaneous abortion). However, the mechanisms underlying DSC-exos inducing EMT is not completely understood. METHODS DSC-exos of normal pregnant women (N-DSC-exos) and URSA patients (URSA-DSC-exos) were extracted and characterized. Characterization of the isolated DSC-exos was performed using with TEM (transmission electron microscopy), NTA (nanoparticle tracking analysis), and WB (western blot) techniques. Subsequently, these DSC-exos were co-cultured with trophoblasts cell lines (HTR-8/SVneo). The influence of both N-DSC-exos and URSA-DSC-exos on trophoblasts proliferation, invasion and migration, as well as on the expression of EMT-related proteins, was evaluated through a series of assays including CCK8 assays, wound healing assays, transwell assays, and western blot, respectively. Then rescue experiments were performed by β-TrCP knockdown or β-TrCP overexpressing trophoblasts with snail-siRNA transfection or β-TrCP overexpressing Lentivirus infection, respectively. Finally, animal experiments were employed to explore the effect of N-DSC-exos on embryo absorption in mice. RESULTS We found increased β-TrCP expression in the villus of URSA patients when compared to the normal pregnant women, alongside reduction in the levels of both snail and N-cadherin within URSA patients. N-DSC-exos can promote the EMT of the trophoblast by inhibiting β-TrCP-mediated ubiquitination and degradation of transcription factor snail. Moreover the capacity to promote EMT was found to be more potent in N-DSC-exos than URSA-DSC-exos. Down-regulation of snail or overexpression of β-TrCP can reverse the effects of N-DSC-exos on trophoblast. Finally, in vivo experiment suggested that N-DSC-exos significantly reduced the embryo resorption rate of spontaneous abortion mouse model. CONCLUSIONS Our findings indicate that URSA-DSC-exos caused insufficient migration and invasion of trophoblast because of disturbing of β-TrCP-mediated ubiquitination and degradation of EMT transcription factor snail. Elucidating the underlying mechanism of this dysregulation may shed light on the novel pathways through which DSC-exos influence trophoblast function, thereby contributing to our understanding of their role in URSA.
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Affiliation(s)
- Miao Xiong
- Department of Obstetrics and Gynecology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pu Jian Road, Shanghai, 200127, People's Republic of China
- Shanghai Key Laboratory of Gynecologic Oncology, Shanghai, People's Republic of China
- Department of Obstetrics and Gynecology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Qiaohong Wang
- Department of Obstetrics and Gynecology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pu Jian Road, Shanghai, 200127, People's Republic of China
- Shanghai Key Laboratory of Gynecologic Oncology, Shanghai, People's Republic of China
| | - Xiaoxin Zhang
- Department of Obstetrics and Gynecology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pu Jian Road, Shanghai, 200127, People's Republic of China
- Shanghai Key Laboratory of Gynecologic Oncology, Shanghai, People's Republic of China
| | - Liping Wen
- Department of Obstetrics and Gynecology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Aimin Zhao
- Department of Obstetrics and Gynecology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pu Jian Road, Shanghai, 200127, People's Republic of China.
- Shanghai Key Laboratory of Gynecologic Oncology, Shanghai, People's Republic of China.
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Velázquez-Cervantes MA, Benítez-Zeferino YR, Flores-Pliego A, Helguera-Repetto AC, Meza-Sánchez DE, Maravillas-Montero JL, León-Reyes G, Mancilla-Ramírez J, Cerna-Cortés JF, Baeza-Ramírez MI, León-Juaárez M. A Review Study of the Participation of Late Domains in Sorting and Transport of Viral Factors to Exosomes. Life (Basel) 2023; 13:1842. [PMID: 37763246 PMCID: PMC10532540 DOI: 10.3390/life13091842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/23/2023] [Accepted: 08/29/2023] [Indexed: 09/29/2023] Open
Abstract
Cellular communication depends heavily on the participation of vesicular systems generated by most cells of an organism. Exosomes play central roles in this process. Today, these vesicles have been characterized, and it has been determined that the cargo they transport is not within a random system. In fact, it depends on various molecular signals and the recruitment of proteins that participate in the biogenesis of exosomes. It has also been shown that multiple viruses can recruit these vesicles to transport viral factors such as genomes or proteins. It has been shown that the late domains present in viral proteins are critical for the exosomal selection and biogenesis systems to recognize these viral proteins and introduce them into the exosomes. In this review, the researchers discuss the evidence related to the characterization of these late domains and their role in exosome recruitment during viral infection.
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Affiliation(s)
- Manuel Adrián Velázquez-Cervantes
- Laboratorio de Virología Perinatal y Diseño Molecular de Antígenos y Biomarcadores, Departamento de Inmunobioquímica, Instituto Nacional de Perinatología, Mexico City 11000, Mexico; (M.A.V.-C.); (Y.R.B.-Z.)
- Laboratorio de Biomembranas, Departamento de Bioquimica, Escueala Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City 11340, Mexico;
| | - Yazmín Rocío Benítez-Zeferino
- Laboratorio de Virología Perinatal y Diseño Molecular de Antígenos y Biomarcadores, Departamento de Inmunobioquímica, Instituto Nacional de Perinatología, Mexico City 11000, Mexico; (M.A.V.-C.); (Y.R.B.-Z.)
- Laboratorio de Microbiología Molecular, Departamento de Microbiología, Escuela Nacional de Ciencias Biologícas, Instituto Politécnico Nacional, Mexico City 11340, Mexico;
| | - Arturo Flores-Pliego
- Departamento de Inmunobioquimica, Instituto Nacional de Perinatología, Mexico City 11000, Mexico; (A.F.-P.); (A.C.H.-R.)
| | - Addy Cecilia Helguera-Repetto
- Departamento de Inmunobioquimica, Instituto Nacional de Perinatología, Mexico City 11000, Mexico; (A.F.-P.); (A.C.H.-R.)
| | - David Eduardo Meza-Sánchez
- Red de Apoyo a la Investigación, Coordinación de la Investigación Científica, Universidad Nacional Autonóma de México, e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City 04510, Mexico; (D.E.M.-S.); (J.L.M.-M.)
| | - José Luis Maravillas-Montero
- Red de Apoyo a la Investigación, Coordinación de la Investigación Científica, Universidad Nacional Autonóma de México, e Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City 04510, Mexico; (D.E.M.-S.); (J.L.M.-M.)
| | - Guadalupe León-Reyes
- Laboratorio de Nutrigenómica y Nutrigenética, Instituto Nacional de Medicina Genómica (INMEGEN), Ciudad de México 14610, Mexico;
| | - Javier Mancilla-Ramírez
- Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City 113440, Mexico;
- Hospital de la Mujer, Secretaría de Salud, Mexico City 11340, Mexico
| | - Jorge Francisco Cerna-Cortés
- Laboratorio de Microbiología Molecular, Departamento de Microbiología, Escuela Nacional de Ciencias Biologícas, Instituto Politécnico Nacional, Mexico City 11340, Mexico;
| | - María Isabel Baeza-Ramírez
- Laboratorio de Biomembranas, Departamento de Bioquimica, Escueala Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City 11340, Mexico;
| | - Moises León-Juaárez
- Laboratorio de Virología Perinatal y Diseño Molecular de Antígenos y Biomarcadores, Departamento de Inmunobioquímica, Instituto Nacional de Perinatología, Mexico City 11000, Mexico; (M.A.V.-C.); (Y.R.B.-Z.)
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5
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Shokati E, Safari E. The immunomodulatory role of exosomal microRNA networks in the crosstalk between tumor-associated myeloid-derived suppressor cells and tumor cells. Int Immunopharmacol 2023; 120:110267. [PMID: 37276829 DOI: 10.1016/j.intimp.2023.110267] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 04/26/2023] [Accepted: 04/28/2023] [Indexed: 06/07/2023]
Abstract
Myeloid-derived suppressor cells (MDSCs) are considered a heterogeneous group of immature myeloid cells engaging in aggressive tumor progression and metastasis in the tumor microenvironment (TME) of patients diagnosed with cancer, through downregulation of anti-tumor immune responses. Exosomes are small vesicles carrying specific cargos, including proteins, lipids, and MicroRNA (miRNAs). Such exosomal miRNAs delivered by MDSCs and tumor cells are short noncoding RNAs mediating some of the immunosuppressive characteristics of MDSCs in the TME. However, when it comes to cancer diseases, how these miRNAs interact with MDSCs and encourage MDSCs differentiation and function need further investigations. In this review, we discuss MDSC-derived exosomal miRNAs and those derived from tumor cells (TDE) could modulate anti-tumor immunity and regulate the interaction between tumor cells and MDSCs in the TME. Afterward, we focus on dividing miRNAs, as an important substance interacting with MDSCs and tumor cells in the TME, into those have an immunosuppressive or stimulating effect not only on MDSCs expansion, differentiation, and suppressive function but also on tumor evasion.
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Affiliation(s)
- Elham Shokati
- Department of Immunology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran; Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran.
| | - Elahe Safari
- Department of Immunology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran; Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran
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6
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Sharma A. Mitochondrial cargo export in exosomes: Possible pathways and implication in disease biology. J Cell Physiol 2023; 238:687-697. [PMID: 36745675 DOI: 10.1002/jcp.30967] [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: 11/14/2022] [Revised: 01/02/2023] [Accepted: 01/20/2023] [Indexed: 02/07/2023]
Abstract
Exosome biogenesis occurs parallel to multiple endocytic traffic routes. These coexisting routes drive cargo loading in exosomes via overlapping of exosome biogenesis with endosomal pathways. One such pathway is autophagy which captures damaged intracellular organelles or their components in an autophagosome vesicle and route them for lysosomal degradation. However, in case of a noncanonical fusion event between autophagosome and maturing multivesicular body (MVB)-a site for exosome biogenesis, the autophagic cargo is putatively loaded in exosomes and subsequent released out of the cell via formation of an "amphisome" like structure. Similarly, during "mitophagy" or mitochondrial (mt) autophagy, amphisome formation routes mitophagy cargo to exosomes. These mt-cargo enriched exosomes or mt-enREXO are often positive for LC3 protein-an autophagic flux marker, and potent regulators of paracrine signaling with both homeostatic and pathological roles. Here, I review this emerging concept and discuss how intracellular autophagic routes helps in generation of mt-enREXO and utility of these vesicles in paracrine cellular signaling and diagnostic areas.
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Affiliation(s)
- Aman Sharma
- ExoCan Healthcare Technologies Ltd, Pune, India
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7
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Wang F, Yang M, Luo W, Zhou Q. Characteristics of tumor microenvironment and novel immunotherapeutic strategies for non-small cell lung cancer. JOURNAL OF THE NATIONAL CANCER CENTER 2022; 2:243-262. [PMID: 39036549 PMCID: PMC11256730 DOI: 10.1016/j.jncc.2022.10.002] [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: 07/29/2022] [Revised: 10/12/2022] [Accepted: 10/14/2022] [Indexed: 11/08/2022] Open
Abstract
Immune checkpoint inhibitor-based immunotherapy has revolutionized the treatment approach of non-small cell lung cancer (NSCLC). Monoclonal antibodies against programmed cell death-1 (PD-1) and PD-ligand 1 (PD-L1) are widely used in clinical practice, but other antibodies that can circumvent innate and acquired resistance are bound to undergo preclinical and clinical studies. However, tumor cells can develop and facilitate the tolerogenic nature of the tumor microenvironment (TME), resulting in tumor progression. Therefore, the immune escape mechanisms exploited by growing lung cancer involve a fine interplay between all actors in the TME. A better understanding of the molecular biology of lung cancer and the cellular/molecular mechanisms involved in the crosstalk between lung cancer cells and immune cells in the TME could identify novel therapeutic weapons in the old war against lung cancer. This article discusses the role of TME in the progression of lung cancer and pinpoints possible advances and challenges of immunotherapy for NSCLC.
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Affiliation(s)
- Fen Wang
- Department of Oncology, Shenzhen Key Laboratory of Gastrointestinal Cancer Translational Research, Cancer Institute, Peking University Shenzhen Hospital, Shenzhen-Peking University-Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Mingyi Yang
- Guangdong Lung Cancer Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- School of Medicine, South China University of Technology, Guangzhou, China
| | - Weichi Luo
- Guangdong Lung Cancer Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Qing Zhou
- Guangdong Lung Cancer Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
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Zhan X, He Q, Sheng J, Jiang X, Lin L, Huang Y, He S, Chen Y, Li L, Zeng Z, Hu S, Wang P, Zhang Y. USP12 positively regulates M-MDSC function to inhibit anti-tumor immunity through deubiquitinating and stabilizing p65. Immunol Suppl 2022; 167:544-557. [PMID: 35898171 DOI: 10.1111/imm.13552] [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: 04/11/2022] [Accepted: 07/21/2022] [Indexed: 11/29/2022]
Abstract
The relative abundance of myeloid-derived suppressor cells (MDSCs) compared to cytotoxic T cells determines the outcomes of diseases and the efficacy of immunotherapy. Ubiquitin-specific peptidase 12 (USP12), a member of the USP family of deubiquitinases (DUBs), targets multiple signaling pathways and regulates diverse biological processes, including cell proliferation and survival. It is well known that ubiquitylation is an important mechanism for regulating the immune response. However, it is unclear whether USP12 regulates tumor growth by influencing MDSCs. In the present study, we reported that USP12 deficiency decreased infiltration and impaired the suppressor function of monocytic (M)-MDSCs, resulting in increased CD8+ T cell response and decelerated tumor growth. USP12-knockout M-MDSCs were less potent in inhibiting the proliferation of CD8+ T cells and their ability to secrete IFN-γ. Furthermore, USP12 deficiency inhibited the suppressor function of M-MDSCs by downregulating the negative regulatory molecules iNOS and PD-L1, through deubiquitinating and stabilizing p65. Our results suggest that USP12 is a positive regulator of M-MDSCs and may serve as a potential target for antitumor therapy.
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Affiliation(s)
- Xiaoxia Zhan
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Qiuying He
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Junli Sheng
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xiaobing Jiang
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Letao Lin
- Minimally Invasive Interventional Division, Department of Medical Imaging and Interventional Radiology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Yulan Huang
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Shitong He
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yitian Chen
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Laisheng Li
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Zhijie Zeng
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Shengfeng Hu
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Peng Wang
- Department of Emergency Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yanling Zhang
- Department of Laboratory Medicine, The First Affiliated Hospital of Sun Yat-sen University. School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
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Stem Cells in the Tumor Immune Microenvironment -Part of the Cure or Part of the Disease? Ontogeny and Dichotomy of Stem and Immune Cells has Led to better Understanding. Stem Cell Rev Rep 2022; 18:2549-2565. [PMID: 35841518 DOI: 10.1007/s12015-022-10428-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/11/2022] [Indexed: 10/17/2022]
Abstract
Stem cells are at the basis of tissue homeostasis, hematopoiesis and various regenerative processes. Epigenetic changes in their somatically imprinted genes, prolonged exposure to mutagens/carcinogens or alteration of their niche can lead to the development of an enabling environment for tumor growth and progression. The involvement of stem cells in both health and disease becomes even more compelling with ontogeny as embryonic and extraembryonic stem cells which persist into adulthood in well established and specific niche may have distinct implications in tumorigenesis. Immune surveillance plays an important role in this interplay since the response of immune cells toward the oncogenic process can range from reactivity to placidity and even complicity, being orchestrated by intercellular molecular dialogues with the other key players of the tumor microenvironment. With the current understanding that every developing and adult tissue contains inherent stem and progenitor cells, in this manuscript we review the most relevant interactions carried out between the stem cells, tumor cells and immune cells in a bottom-up incursion through the tumor microenvironment beginning from the perivascular niche and going through the tumoral parenchyma and the related stroma. With the exploitation of various factors that influence the behavior of immune effectors toward stem cells and other resting cells in their niche, new therapeutic strategies to tackle the polarization of immune effectors toward a more immunogenic phenotype may arise.
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Morales-Sanfrutos J, Munoz J. UNRAVELLING THE COMPLEXITY OF THE EXTRACELLULAR VESICLE LANDSCAPE WITH ADVANCED PROTEOMICS. Expert Rev Proteomics 2022; 19:89-101. [PMID: 35290757 DOI: 10.1080/14789450.2022.2052849] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION The field of extracellular vesicles (EVs) is rapidly advancing. This progress is fuelled by the potential applications of these agents as biomarkers and also as an attractive source to encapsulate therapeutics and other agents to target specific cells. AREAS COVERED Different types of EVs, including exosomes, and other nanoparticles have been identified in the last years with key regulatory functions in cell-cell communication. However, the techniques used for their purification possess inherent limitations, resulting in heterogeneous preparations contaminated by other EVs subtypes and nano-size structures. It is therefore urgent to deconvolute the molecular constituents present in each type of EVs in order to accurately ascribe their specific functions. In this context, proteomics can profile, not only the lumen proteins and surface markers, but also their post-translational modifications, which will inform on the mechanisms of cargo selection and sorting. EXPERT OPINION Mass spectrometry-based proteomics is now a mature technique and has started to deliver new insights in the EV field. Here, we review recent developments in sample preparation, mass spectrometry (MS) and computational analysis and discuss how these technological advances, in conjunction with improved purification protocols, could impact the proteomic characterization of the complex landscape of EVs and other secreted nanoparticles.
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Affiliation(s)
| | - Javier Munoz
- Proteomics Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.,Cell Signaling and Clinical Proteomics Group. Biocruces Bizkaia Health Research Institute. 48903 Barkaldo, Spain.,Ikerbasque, Basque foundation for science, Bilbao, Spain
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11
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Chen Z, Yuan R, Hu S, Yuan W, Sun Z. Roles of the Exosomes Derived From Myeloid-Derived Suppressor Cells in Tumor Immunity and Cancer Progression. Front Immunol 2022; 13:817942. [PMID: 35154134 PMCID: PMC8829028 DOI: 10.3389/fimmu.2022.817942] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 01/12/2022] [Indexed: 12/23/2022] Open
Abstract
Tumor immunity is involved in malignant tumor progression. Myeloid-derived suppressor cells (MDSCs) play an irreplaceable role in tumor immunity. MDSCs are composed of immature myeloid cells and exhibit obvious immunomodulatory functions. Exosomes released by MDSCs (MDSCs-Exos) have similar effects to parental MDSCs in regulating tumor immunity. In this review, we provided a comprehensive description of the characteristics, functions and mechanisms of exosomes. We analyzed the immunosuppressive, angiogenesis and metastatic effects of MDSCs-Exos in different tumors through multiple perspectives. Immunotherapy targeting MDSCs-Exos has demonstrated great potential in cancers and non-cancerous diseases.
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Affiliation(s)
- Zhuang Chen
- Department of Colorectal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Rui Yuan
- Department of Colorectal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Shengyun Hu
- Department of Colorectal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Weitang Yuan
- Department of Colorectal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zhenqiang Sun
- Department of Colorectal Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Schopfer LM, Onder S, Lockridge O. Evaluation of mass spectrometry MS/MS spectra for the presence of isopeptide crosslinked peptides. PLoS One 2021; 16:e0254450. [PMID: 34242352 PMCID: PMC8270460 DOI: 10.1371/journal.pone.0254450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Accepted: 06/25/2021] [Indexed: 12/14/2022] Open
Abstract
Isopeptide crosslinked proteins can be the product of transglutaminase or of exposure to organophosphorus toxicants (OP). Transglutaminase links glutamine to lysine with loss of ammonia. OP toxicants induce a link between glutamic acid and lysine with loss of water. Our goal was to establish criteria to distinguish real from false isopeptide crosslinks reported by software searches of mass spectrometry data. We used fragmentation spectra of tryptic peptides from MAP-rich tubulin Sus scrofa as a test system for detection of naturally-occurring isopeptide crosslinks. Data were analyzed with Protein Prospector. Criteria for the assignments included the presence of at least 1 crosslink specific product ion, fragment ions from both peptides, Protein Prospector scores ≥20, and best fit of the MS/MS data to the crosslinked peptide as opposed to a linear peptide. Out of 301,364 spectra, 15 potential transglutaminase-type crosslinked peptide candidates were identified. Manual evaluation of these MS/MS spectra reduced the number to 1 valid crosslink between Q112 of NFH and K368 of Tau. Immunopurification with anti-isopeptide 81D1C2 confirmed that MAP-rich tubulin contained only one isopeptide. Support for this isopeptide bond was obtained by showing that transglutaminase was capable of incorporating dansyl-aminohexyl -QQIV into K368. A model of the KIETHK-QLEAHNR isopeptide was synthesized with the aid of transglutaminase. MS/MS spectra of the model validated our interpretation of the native isopeptide. An OP-induced isopeptide bond between K163 of tubulin alpha-1A and E158 of tubulin beta-4B was induced by treating MAP-rich tubulin with 100 μM chlorpyrifos oxon. This crosslink was supported by the criteria described above and by the presence of diethoxyphospho-lysine 163 in the tubulin alpha-1A peptide. The information obtained in this work is valuable for future studies that aim to understand why exposure to OP is associated with increased risk of neurodegenerative disease.
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Affiliation(s)
- Lawrence M. Schopfer
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE, United States of America
| | - Seda Onder
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE, United States of America
- Department of Biochemistry, School of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Oksana Lockridge
- Eppley Institute, University of Nebraska Medical Center, Omaha, NE, United States of America
- * E-mail:
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13
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Shaikh SB, Najar MA, Prabhu A, Rex DAB, Chanderasekaran J, Behera SK, Modi PK, Prasad TSK, Bhandary YP. The unique molecular targets associated antioxidant and antifibrotic activity of curcumin in in vitro model of acute lung injury: A proteomic approach. Biofactors 2021; 47:627-644. [PMID: 33864298 DOI: 10.1002/biof.1732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 03/24/2021] [Indexed: 12/15/2022]
Abstract
Bleomycin (BLM) injury is associated with the severity of acute lung injury (ALI) leading to fibrosis, a high-morbidity, and high-mortality respiratory disease of unknown etiology. BLM-induced ALI is marked by the activation of a potent fibrogenic cytokine transcription growth factor beta-1 (TGFβ-1), which is considered a critical cytokine in the progression of alveolar injury. Previously, our work demonstrated that a diet-derived compound curcumin (diferuloylmethane), represents its antioxidative and antifibrotic application in TGF-β1-mediated BLM-induced alveolar basal epithelial cells. However, curcumin-specific protein targets, as well as its mechanism using mass spectrometry-based proteomic approach, remain elusive. To elucidate the underlying mechanism, a quantitative proteomics approach and bioinformatics analysis were employed to identify the protein targets of curcumin in BLM or TGF-β1-treated cells. With subsequent in vitro experiments, curcumin-related pathways and cellular processes were predicted and validated. The current study discusses two separate proteomics experiments using BLM and TGF-β1-treated cells with the proteomics approach, various unique target proteins were identified, and proteomic analysis revealed that curcumin reversed the expressions of unique proteins like DNA topoisomerase 2-alpha (TOP2A), kinesin-like protein (KIF11), centromere protein F (CENPF), and so on BLM or TGF-β1 injury. For the first time, the current study reveals that curcumin restores TGF-β1 induced peroxisomes like PEX-13, PEX-14, PEX-19, and ACOX1. This was verified by subsequent in vitro assays. This study generated molecular evidence to deepen our understanding of the therapeutic role of curcumin at the proteomic level and may be useful to identify molecular targets for future drug discovery.
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Affiliation(s)
- Sadiya Bi Shaikh
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore, Karnataka, India
| | - Mohd Altaf Najar
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, Karnataka, India
| | - Ashwini Prabhu
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore, Karnataka, India
| | - D A B Rex
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, Karnataka, India
| | | | - Santosh Kumar Behera
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, Karnataka, India
| | - Prashant Kumar Modi
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, Karnataka, India
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14
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Atukorala I, Mathivanan S. The Role of Post-Translational Modifications in Targeting Protein Cargo to Extracellular Vesicles. Subcell Biochem 2021; 97:45-60. [PMID: 33779913 DOI: 10.1007/978-3-030-67171-6_3] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Extracellular vesicles (EVs) are naturally occurring nanoparticles that contain proteins and nucleic acids. It is speculated that cells release EVs loaded with a selective cargo of proteins through highly regulated processes. Several proteomic and biochemical studies have highlighted phosphorylated, glycosylated, ubiquitinated, SUMOylated, oxidated and palmitoylated proteins within the EVs. Emerging evidences suggest that post-translational modifications (PTMs) can regulate the sorting of specific proteins into EVs and such proteins with specific PTMs have also been identified in clinical samples. Hence, it has been proposed that EV proteins with PTMs could be used as potential biomarkers of disease conditions. Among the other cellular mechanisms, the endosomal sorting complex required for transport (ESCRT) is also implicated in cargo sorting into EVs. In this chapter, various PTMs that are shown to regulate protein cargo sorting into EVs will be discussed.
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Affiliation(s)
- Ishara Atukorala
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia.
| | - Suresh Mathivanan
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
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15
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Fenselau C, Ostrand-Rosenberg S. Molecular cargo in myeloid-derived suppressor cells and their exosomes. Cell Immunol 2021; 359:104258. [PMID: 33338939 PMCID: PMC7802618 DOI: 10.1016/j.cellimm.2020.104258] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/25/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022]
Abstract
Collaborative research is reviewed in which mass spectrometry-based proteomics and next generation sequencing were used qualitatively and quantitatively to interrogate proteins and RNAs carried in intact myeloid-derived suppressor cells (MDSC) and exosomes shed in vitro by MDSC. In aggregate exosomes more than 4000 proteins were identified, including annexins and immunosuppressive mediators. Bioassays showed that exosomes induce MDSC chemotaxis dependent on S100A8 and S100A9 in their cargo. Surface selective chemistry identified glycoproteins on MDSC and exosome surfaces, including CD47 and thrombospondin 1, which both facilitate exosome-catalyzed chemotaxis. Large numbers of mRNAs and microRNAs were identified in aggregate exosomes, whose potential functions in receptor cells include angiogenesis, and proinflammatory and immunosuppressive activities. Inflammation was found to have asymmetric effects on MDSC and exosomal cargos. Collectively, our findings indicate that the exosomes shed by MDSC provide divergent and complementary functions that support the immunosuppression and tumor promotion activities of MDSC.
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Affiliation(s)
- Catherine Fenselau
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, United States.
| | - Suzanne Ostrand-Rosenberg
- Department of Biological Sciences, University of Maryland, Baltimore County, MD 20742, United States; Department of Pathology, University of Utah, Huntsman Cancer Institute, Salt Lake City, UT 84112, United States
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16
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Dietz S, Schwarz J, Rühle J, Schaller M, Fehrenbacher B, Marmé A, Schmid E, Peter A, Poets CF, Gille C, Köstlin-Gille N. Extracellular vesicles released by myeloid-derived suppressor cells from pregnant women modulate adaptive immune responses. Cell Immunol 2020; 361:104276. [PMID: 33517124 DOI: 10.1016/j.cellimm.2020.104276] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 12/18/2020] [Accepted: 12/22/2020] [Indexed: 12/19/2022]
Abstract
Immunological pregnancy complications are a main challenge in reproductive medicine. Mechanisms regulating the adaptation of the maternal immune system to pregnancy are incompletely understood and therapeutic options limited. Myeloid derived suppressor cells (MDSC) are immune-modulatory cells expanding during healthy pregnancy and seem to play a crucial role for maternal-fetal tolerance. Recent studies showed that exosomes produced by MDSC have immune-modulatory effects corresponding to their parental cells under different pathological conditions. Here, we investigated immunological effects of exosomes of GR-MDSC during pregnancy. Isolated GR-MDSC exosomes from peripheral blood of pregnant women were tested for functionality in different in vitro assays. We show that GR-MDSC exosomes exhibited profound immune-modulatory effects such as suppression of T-cell proliferation, T helper 2 (Th2)-cell polarization, induction of regulatory T-cells and inhibition of lymphocyte cytotoxicity. Our results confirm that MDSC-derived exosomes functionally correspond to their parental cells and identify them as an interesting therapeutic target for immunological pregnancy complications.
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Affiliation(s)
- Stefanie Dietz
- Tuebingen University Children's Hospital, Department of Neonatology, Tuebingen, Germany
| | - Julian Schwarz
- Tuebingen University Children's Hospital, Department of Neonatology, Tuebingen, Germany
| | - Jessica Rühle
- Tuebingen University Children's Hospital, Department of Neonatology, Tuebingen, Germany
| | - Martin Schaller
- Department of Dermatology, University of Tuebingen, Tuebingen, Germany
| | | | | | - Evi Schmid
- Department of Pediatric Surgery & Pediatric Urology, University of Tuebingen, Germany
| | - Andreas Peter
- German Centre for Diabetes Research (DZD), Tuebingen, Germany; Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Centre Munich at the University of Tuebingen, Tuebingen, Germany; Institute for Clinical Chemistry and Pathobiochemistry, Department for Diagnostic Laboratory Medicine, University Hospital Tübingen, Germany
| | - Christian F Poets
- Tuebingen University Children's Hospital, Department of Neonatology, Tuebingen, Germany
| | - Christian Gille
- Tuebingen University Children's Hospital, Department of Neonatology, Tuebingen, Germany.
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Abstract
Lung cancer (LC) is the leading cause of cancer-related death worldwide due to its late diagnosis and poor outcomes. As has been found for other types of tumors, there is increasing evidence that myeloid-derived suppressor cells (MDSCs) play important roles in the promotion and progression of LC. Here, we briefly introduce the definition of MDSCs and their immunosuppressive functions. We next specifically discuss the multiple roles of MDSCs in the lung tumor microenvironment, including those in tumor growth and progression mediated by inhibiting antitumor immunity, and the associations of MDSCs with a poor prognosis and increased resistance to chemotherapy and immunotherapy. Finally, we also discuss preclinical and clinical treatment strategies targeting MDSCs, which may have the potential to enhance the efficacy of immunotherapy.
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Affiliation(s)
- Zhenzhen Yang
- Department of Oncology, The First Affiliated Hospital of Zhengzhou University, NO.1 Eastern Jianshe Road, Zhengzhou, 450052, Henan, China
| | - Jiacheng Guo
- Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
- Henan Province Key Laboratory of Cardiac Injury and Repair, Zhengzhou, 450052, Henan, China
| | - Lanling Weng
- Department of Oncology, The First Affiliated Hospital of Zhengzhou University, NO.1 Eastern Jianshe Road, Zhengzhou, 450052, Henan, China
| | - Wenxue Tang
- Departments of Otolaryngology, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, China.
- Center for Precision Medicine of Zhengzhou University, NO.40 North Daxue Road, Zhengzhou, 450052, Henan, China.
| | - Shuiling Jin
- Department of Oncology, The First Affiliated Hospital of Zhengzhou University, NO.1 Eastern Jianshe Road, Zhengzhou, 450052, Henan, China.
| | - Wang Ma
- Department of Oncology, The First Affiliated Hospital of Zhengzhou University, NO.1 Eastern Jianshe Road, Zhengzhou, 450052, Henan, China.
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18
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Myeloid-derived suppressor cells-new and exciting players in lung cancer. J Hematol Oncol 2020; 13:10. [PMID: 32005273 PMCID: PMC6995114 DOI: 10.1186/s13045-020-0843-1] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 01/15/2020] [Indexed: 12/11/2022] Open
Abstract
Lung cancer (LC) is the leading cause of cancer-related death worldwide due to its late diagnosis and poor outcomes. As has been found for other types of tumors, there is increasing evidence that myeloid-derived suppressor cells (MDSCs) play important roles in the promotion and progression of LC. Here, we briefly introduce the definition of MDSCs and their immunosuppressive functions. We next specifically discuss the multiple roles of MDSCs in the lung tumor microenvironment, including those in tumor growth and progression mediated by inhibiting antitumor immunity, and the associations of MDSCs with a poor prognosis and increased resistance to chemotherapy and immunotherapy. Finally, we also discuss preclinical and clinical treatment strategies targeting MDSCs, which may have the potential to enhance the efficacy of immunotherapy.
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19
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Leidal AM, Debnath J. Unraveling the mechanisms that specify molecules for secretion in extracellular vesicles. Methods 2020; 177:15-26. [PMID: 31978536 DOI: 10.1016/j.ymeth.2020.01.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Revised: 12/19/2019] [Accepted: 01/16/2020] [Indexed: 12/15/2022] Open
Abstract
Extracellular vesicles (EVs) are small membrane-bound organelles naturally released from cells and potentially function as vehicles of intercellular communication. Cells release numerous sub-species of EVs, including exosomes and microvesicles, which are formed via distinct cellular pathways and molecular machineries and contain specific proteins, RNAs and lipids. Accumulating evidence indicates that the repertoire of molecules packaged into EVs is shaped by both the physiological state of the cell and the EV biogenesis pathway involved. Although these observations intimate that precisely regulated pathways sort molecules into EVs, the underlying molecular mechanisms that direct molecules for secretion remain poorly defined. Recently, with the advancement of mass spectrometry, next-generation sequencing techniques and molecular biology tools, several mechanisms contributing to EV cargo selection are beginning to be unraveled. This review examines strategies employed to reveal how specific proteins, RNAs and lipids are directed for secretion via EVs.
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Affiliation(s)
- Andrew M Leidal
- Department of Pathology and Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94143, USA.
| | - Jayanta Debnath
- Department of Pathology and Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94143, USA
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20
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Sukumaran A, Coish J, Yeung J, Muselius B, Gadjeva M, MacNeil A, Geddes-McAlister J. Decoding communication patterns of the innate immune system by quantitative proteomics. J Leukoc Biol 2019; 106:1221-1232. [PMID: 31556465 PMCID: PMC7309189 DOI: 10.1002/jlb.2ri0919-302r] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/12/2019] [Accepted: 09/13/2019] [Indexed: 12/15/2022] Open
Abstract
The innate immune system is a collective network of cell types involved in cell recruitment and activation using a robust and refined communication system. Engagement of receptor-mediated intracellular signaling initiates communication cascades by conveying information about the host cell status to surrounding cells for surveillance and protection. Comprehensive profiling of innate immune cells is challenging due to low cell numbers, high dynamic range of the cellular proteome, low abundance of secreted proteins, and the release of degradative enzymes (e.g., proteases). However, recent advances in mass spectrometry-based proteomics provides the capability to overcome these limitations through profiling the dynamics of cellular processes, signaling cascades, post-translational modifications, and interaction networks. Moreover, integration of technologies and molecular datasets provide a holistic view of a complex and intricate network of communications underscoring host defense and tissue homeostasis mechanisms. In this Review, we explore the diverse applications of mass spectrometry-based proteomics in innate immunity to define communication patterns of the innate immune cells during health and disease. We also provide a technical overview of mass spectrometry-based proteomic workflows, with a focus on bottom-up approaches, and we present the emerging role of proteomics in immune-based drug discovery while providing a perspective on new applications in the future.
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Affiliation(s)
- A. Sukumaran
- Molecular and Cellular Biology Department, University of Guelph, Guelph, ON, Canada, N1G 2W1
| | - J.M. Coish
- Department of Health Sciences, Brock University, St. Catharines, ON, L2S 3A1
| | - J. Yeung
- Molecular and Cellular Biology Department, University of Guelph, Guelph, ON, Canada, N1G 2W1
| | - B. Muselius
- Molecular and Cellular Biology Department, University of Guelph, Guelph, ON, Canada, N1G 2W1
| | - M. Gadjeva
- Division of Infectious Diseases, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA 02115
| | - A.J. MacNeil
- Department of Health Sciences, Brock University, St. Catharines, ON, L2S 3A1
| | - J. Geddes-McAlister
- Molecular and Cellular Biology Department, University of Guelph, Guelph, ON, Canada, N1G 2W1
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21
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Ageta H, Tsuchida K. Post-translational modification and protein sorting to small extracellular vesicles including exosomes by ubiquitin and UBLs. Cell Mol Life Sci 2019; 76:4829-4848. [PMID: 31363817 PMCID: PMC11105257 DOI: 10.1007/s00018-019-03246-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 07/06/2019] [Accepted: 07/23/2019] [Indexed: 02/06/2023]
Abstract
Exosomes, a type of small extracellular vesicles (sEVs), are secreted membrane vesicles that are derived from various cell types, including cancer cells, mesenchymal stem cells, and immune cells via multivesicular bodies (MVBs). These sEVs contain RNAs (mRNA, miRNA, lncRNA, and rRNA), lipids, DNA, proteins, and metabolites, all of which mediate cell-to-cell communication. This communication is known to be implicated in a diverse set of diseases such as cancers and their metastases and degenerative diseases. The molecular mechanisms, by which proteins are modified and sorted to sEVs, are not fully understood. Various cellular processes, including degradation, transcription, DNA repair, cell cycle, signal transduction, and autophagy, are known to be associated with ubiquitin and ubiquitin-like proteins (UBLs). Recent studies have revealed that ubiquitin and UBLs also regulate MVBs and protein sorting to sEVs. Ubiquitin-like 3 (UBL3)/membrane-anchored Ub-fold protein (MUB) acts as a post-translational modification (PTM) factor to regulate efficient protein sorting to sEVs. In this review, we focus on the mechanism of PTM by ubiquitin and UBLs and the pathway of protein sorting into sEVs and discuss the potential biological significance of these processes.
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Affiliation(s)
- Hiroshi Ageta
- Division for Therapies Against Intractable Diseases, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan
| | - Kunihiro Tsuchida
- Division for Therapies Against Intractable Diseases, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan.
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22
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Sharma A, Johnson A. Exosome DNA: Critical regulator of tumor immunity and a diagnostic biomarker. J Cell Physiol 2019; 235:1921-1932. [DOI: 10.1002/jcp.29153] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 08/26/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Aman Sharma
- ExoCan Healthcare Technologies Ltd, Lab 4 400 NCL Innovation Park Pune India
| | - Abiya Johnson
- ExoCan Healthcare Technologies Ltd, Lab 4 400 NCL Innovation Park Pune India
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23
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SILAC-Based Quantification of TGFBR2-Regulated Protein Expression in Extracellular Vesicles of Microsatellite Unstable Colorectal Cancers. Int J Mol Sci 2019; 20:ijms20174162. [PMID: 31454892 PMCID: PMC6747473 DOI: 10.3390/ijms20174162] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/21/2019] [Accepted: 08/23/2019] [Indexed: 12/13/2022] Open
Abstract
Microsatellite unstable (MSI) colorectal cancers (CRCs) are characterized by mutational inactivation of Transforming Growth Factor Beta Receptor Type 2 (TGFBR2). TGFBR2-deficient CRCs present altered target gene and protein expression. Such cellular alterations modulate the content of CRC-derived extracellular vesicles (EVs). EVs function as couriers of proteins, nucleic acids, and lipids in intercellular communication. At a qualitative level, we have previously shown that TGFBR2 deficiency causes overall alterations in the EV protein content. To deepen the basic understanding of altered protein dynamics, this work aimed to determine TGFBR2-dependent EV protein signatures in a quantitative manner. Using a stable isotope labeling with amino acids in cell culture (SILAC) approach for mass spectrometry-based quantification, 48 TGFBR2-regulated proteins were identified in MSI CRC-derived EVs. Overall, TGFBR2 deficiency caused upregulation of several EV proteins related to the extracellular matrix and nucleosome as well as downregulation of proteasome-associated proteins. The present study emphasizes the general overlap of proteins between EVs and their parental CRC cells but also highlights the impact of TGFBR2 deficiency on EV protein composition. From a clinical perspective, TGFBR2-regulated quantitative differences of protein expression in EVs might nominate novel biomarkers for liquid biopsy-based MSI typing in the future.
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Ruf J, Vairo D, Paganelli F, Guieu R. Extracellular vesicles with ubiquitinated adenosine A 2A receptor in plasma of patients with coronary artery disease. J Cell Mol Med 2019; 23:6805-6811. [PMID: 31444994 PMCID: PMC6787504 DOI: 10.1111/jcmm.14564] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 06/10/2019] [Accepted: 07/08/2019] [Indexed: 02/06/2023] Open
Abstract
Extracellular vesicles (EV) can transfer cellular molecules for specific intercellular communication with potential relevance in pathological conditions. We searched for the presence in plasma from coronary artery disease (CAD) patients of EV containing the adenosine A2A receptor (A2AR), a signalling receptor associated with myocardial ischaemia and whose expression is related to homocysteine (HCy) metabolism. Using protein organic solvent precipitation for plasma EV preparation and Western blotting for protein identification, we found that plasma from CAD patients contained various amounts of EV with ubiquitin bound to A2AR. Interestingly, the presence of ubiquitinated A2AR in EV from patients was dependent on hyperhomocysteinemia, the amount being inversely proportional to A2AR expression in peripheral mononuclear cells in patients with the highest levels of HCy. CEM, a human T cell line, was also found to released EV containing various amounts of ubiquitinated A2AR in stimulated conditions depending on the hypoxic status and HCy level of culture medium. Together, these data show that ubiquitinated A2AR‐containing EV circulate in the plasma of CAD patients and that this presence is related to hyperhomocysteinemia. A2AR in plasma EV could be a useful tool for diagnosis and a promising drug for the treatment of CAD.
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Affiliation(s)
- Jean Ruf
- Center for CardioVascular and Nutrition Research (C2VN), INSERM, INRA and Aix-Marseille University, Marseille, France
| | - Donato Vairo
- Center for CardioVascular and Nutrition Research (C2VN), INSERM, INRA and Aix-Marseille University, Marseille, France
| | - Franck Paganelli
- Center for CardioVascular and Nutrition Research (C2VN), INSERM, INRA and Aix-Marseille University, Marseille, France.,Department of Cardiology, North Hospital, Marseille, France
| | - Régis Guieu
- Center for CardioVascular and Nutrition Research (C2VN), INSERM, INRA and Aix-Marseille University, Marseille, France.,Laboratory of Biochemistry, Timone University Hospital, Marseille, France
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25
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Ticket to a bubble ride: Cargo sorting into exosomes and extracellular vesicles. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:140203. [PMID: 30822540 DOI: 10.1016/j.bbapap.2019.02.005] [Citation(s) in RCA: 172] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 02/15/2019] [Accepted: 02/22/2019] [Indexed: 12/11/2022]
Abstract
Extracellular vesicles (EVs) are released by cells into the extracellular milieu to facilitate intercellular communication in both physiological and pathological condition. EVs contain selective repertoires of proteins, RNAs, lipids and metabolites that moderate signalling pathways in the recipient cells. The enrichment of a particular set of proteins or RNAs within the EVs highlights the existence of specific sorting mechanisms that orchestrate the selective packaging of the cargo. The molecular machinery of cargo sorting has remained obscure over the years and functional studies are required to understand this complex mechanism. In this article, we offer a brief overview of the molecular mechanisms that are known to regulate sorting of various molecules into EVs. We also discuss how different pathways of biogenesis alter the exosomal cargo as well and the implications of the cellular state on the content of the EVs. Understanding the sorting of exosomal cargo could further be exploited in clinical settings for targeted drug delivery and to block disease progression.
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26
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Li M, Zhu D, Wang T, Xia X, Tian J, Wang S. Roles of Myeloid-Derived Suppressor Cell Subpopulations in Autoimmune Arthritis. Front Immunol 2018; 9:2849. [PMID: 30564242 PMCID: PMC6288996 DOI: 10.3389/fimmu.2018.02849] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 11/19/2018] [Indexed: 12/29/2022] Open
Abstract
Emerging evidence suggests the promise of the use of myeloid-derived suppressor cells (MDSCs) in inflammatory disorders based on their unique immune-intervention properties. However, the roles of MDSCs in autoimmune arthritis are not completely understood. Indeed, their immunosuppressive functions in arthritic conditions remain controversial, with heterogeneity among MDSCs and differential effects among subpopulations receiving much attention. As a result, it is necessary to determine the roles of MDSC subpopulations in autoimmune arthritis to clarify their diagnostic and therapeutic potential. Interestingly, in the inflammation niche of autoimmune arthritis, each MDSC subpopulation can exhibit both alternatives of a given characteristic. Moreover, polymorphonuclear MDSCs (PMN-MDSCs) are likely to be more suppressive and stable compared with monocytic MDSCs (MO-MDSCs). Although various important cytokines associated with the differentiation of MDSCs or MDSC subpopulations from immature myeloid precursors, such as granulocyte colony-stimulating factor (G-CSF), have been largely applied in external inductive systems, their roles are not entirely clear. Moreover, MDSC-based clinical treatments in rheumatoid arthritis (RA) continue to represent a significant challenge, as also reported for other autoimmune diseases. In this review, we describe the effects and actions of MDSC subpopulations on the development of autoimmune arthritis and analyze several types of MDSC-based therapeutic strategies to provide comprehensive information regarding immune networks and a foundation for more effective protocols for autoimmune arthritis.
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Affiliation(s)
- Min Li
- Department of Laboratory Medicine, The Affiliated People's Hospital, Jiangsu University, Zhenjiang, China.,Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Dongwei Zhu
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Tingting Wang
- Department of Laboratory Medicine, Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi Children's Hospital, Wuxi, China
| | - Xueli Xia
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Jie Tian
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Shengjun Wang
- Department of Laboratory Medicine, The Affiliated People's Hospital, Jiangsu University, Zhenjiang, China.,Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
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27
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Yousafzai NA, Wang H, Wang Z, Zhu Y, Zhu L, Jin H, Wang X. Exosome mediated multidrug resistance in cancer. Am J Cancer Res 2018; 8:2210-2226. [PMID: 30555739 PMCID: PMC6291647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 10/08/2018] [Indexed: 06/09/2023] Open
Abstract
Extracellular vesicles (EVs), named as exosomes, were recently found to play important roles in cell-cell communication by transducing various biochemical and genetic information. Exosomes, secreted from either tumor cells or stromal cells including immune cells, can eventually remodel tumor environment to promote tumor progression such as metastasis and multidrug resistance (MDR). Therefore, the detection or targeting of biochemical and genetic cargos like proteins, lipids, metabolites and various types of RNAs or DNAs are believed to be valuable for the diagnosis and treatment of human cancer. In this review, we will summarize recent progresses in the research of exosomes especially its biological and clinical relevance to MDR. By doing so, we hope it could be valuable for the prevention, detection and intervention of MDR which is one of the major challenges for the clinical management of human cancers.
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Affiliation(s)
- Neelum Aziz Yousafzai
- Department of Medical Oncology, Key Lab of Biotherapy in Zhejiang, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
| | - Hanying Wang
- Department of Medical Oncology, Key Lab of Biotherapy in Zhejiang, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
| | - Zhuo Wang
- Department of Medical Oncology, Key Lab of Biotherapy in Zhejiang, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
| | - Yiran Zhu
- Labortory of Cancer Biology, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
| | - Liyuan Zhu
- Labortory of Cancer Biology, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
| | - Hongchuan Jin
- Labortory of Cancer Biology, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
| | - Xian Wang
- Department of Medical Oncology, Key Lab of Biotherapy in Zhejiang, Sir Run Run Shaw Hospital, Medical School of Zhejiang UniversityHangzhou, China
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28
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Ostrand-Rosenberg S, Fenselau C. Myeloid-Derived Suppressor Cells: Immune-Suppressive Cells That Impair Antitumor Immunity and Are Sculpted by Their Environment. THE JOURNAL OF IMMUNOLOGY 2018; 200:422-431. [PMID: 29311384 DOI: 10.4049/jimmunol.1701019] [Citation(s) in RCA: 362] [Impact Index Per Article: 60.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 08/24/2017] [Indexed: 12/19/2022]
Abstract
Myeloid-derived suppressor cells (MDSC) are a diverse population of immature myeloid cells that have potent immune-suppressive activity. Studies in both mice and humans have demonstrated that MDSC accumulate in most individuals with cancer, where they promote tumor progression, inhibit antitumor immunity, and are an obstacle to many cancer immunotherapies. As a result, there has been intense interest in understanding the mechanisms and in situ conditions that regulate and sustain MDSC, and the mechanisms MDSC use to promote tumor progression. This article reviews the characterization of MDSC and how they are distinguished from neutrophils, describes the suppressive mechanisms used by MDSC to mediate their effects, and explains the role of proinflammatory mediators and the tumor microenvironment in driving MDSC accumulation, suppressive potency, and survival.
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Affiliation(s)
- Suzanne Ostrand-Rosenberg
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD 21250; and
| | - Catherine Fenselau
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742
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29
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Zöller M, Zhao K, Kutlu N, Bauer N, Provaznik J, Hackert T, Schnölzer M. Immunoregulatory Effects of Myeloid-Derived Suppressor Cell Exosomes in Mouse Model of Autoimmune Alopecia Areata. Front Immunol 2018; 9:1279. [PMID: 29951053 PMCID: PMC6008552 DOI: 10.3389/fimmu.2018.01279] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 05/22/2018] [Indexed: 01/28/2023] Open
Abstract
The treatment of autoimmune diseases still poses a major challenge, frequently relying on non-specific immunosuppressive drugs. Current efforts aim at reestablishing self tolerance using immune cells with suppressive activity like the regulatory T cells (Treg) or the myeloid-derived suppressor cells (MDSC). We have demonstrated therapeutic efficacy of MDSC in mouse Alopecia Areata (AA). In the same AA model, we now asked whether MDSC exosomes (MDSC-Exo) can replace MDSC. MDSC-Exo from bone marrow cells (BMC) cultures of healthy donors could substantially facilitate treatment. With knowledge on MDSC-Exo being limited, their suitability needs to be verified in advance. Protein marker profiles suggest comparability of BMC- to ex vivo collected inflammatory MDSC/MDSC-Exo in mice with a chronic contact dermatitis, which is a therapeutic option in AA. Proteome analyses substantiated a large overlap of function-relevant molecules in MDSC and MDSC-Exo. Furthermore, MDSC-Exo are taken up by T cells, macrophages, NK, and most avidly by Treg and MDSC-Exo uptake exceeds binding of MDSC themselves. In AA mice, MDSC-Exo preferentially target skin-draining lymph nodes and cells in the vicinity of remnant hair follicles. MDSC-Exo uptake is accompanied by a strong increase in Treg, reduced T helper proliferation, mitigated cytotoxic activity, and a slight increase in lymphocyte apoptosis. Repeated MDSC-Exo application in florid AA prevented progression and sufficed for partial hair regrowth. Deep sequencing of lymphocyte mRNA from these mice revealed a significant increase in immunoregulatory mRNA, including FoxP3 and arginase 1. Downregulated mRNA was preferentially engaged in prohibiting T cell hyperreactivity. Taken together, proteome analysis provided important insights into potential MDSC-Exo activities, these Exo preferentially homing into AA-affected organs. Most importantly, changes in leukocyte mRNA seen after treatment of AA mice with MDSC-Exo sustainably supports the strong impact on the adaptive and the non-adaptive immune system, with Treg expansion being a dominant feature. Thus, MDSC-Exo could potentially serve as therapeutic agents in treating AA and other autoimmune diseases.
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Affiliation(s)
- Margot Zöller
- Tumor Cell Biology, Department of Surgery, University Hospital of Heidelberg, Heidelberg, Germany
| | - Kun Zhao
- Tumor Cell Biology, Department of Surgery, University Hospital of Heidelberg, Heidelberg, Germany
| | - Natalia Kutlu
- Tumor Cell Biology, Department of Surgery, University Hospital of Heidelberg, Heidelberg, Germany
| | - Nathalie Bauer
- Tumor Cell Biology, Department of Surgery, University Hospital of Heidelberg, Heidelberg, Germany
| | - Jan Provaznik
- Gene Core Unit, EMBL Heidelberg, Heidelberg, Germany
| | - Thilo Hackert
- Pancreas Section, Department of Surgery, University Hospital of Heidelberg, Heidelberg, Germany
| | - Martina Schnölzer
- Functional Proteome Analysis, German Cancer Research Center, Heidelberg, Germany
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30
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Zöller M. Janus-Faced Myeloid-Derived Suppressor Cell Exosomes for the Good and the Bad in Cancer and Autoimmune Disease. Front Immunol 2018; 9:137. [PMID: 29456536 PMCID: PMC5801414 DOI: 10.3389/fimmu.2018.00137] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Accepted: 01/16/2018] [Indexed: 12/22/2022] Open
Abstract
Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of immature myeloid cells originally described to hamper immune responses in chronic infections. Meanwhile, they are known to be a major obstacle in cancer immunotherapy. On the other hand, MDSC can interfere with allogeneic transplant rejection and may dampen autoreactive T cell activity. Whether MDSC-Exosomes (Exo) can cope with the dangerous and potentially therapeutic activities of MDSC is not yet fully explored. After introducing MDSC and Exo, it will be discussed, whether a blockade of MDSC-Exo could foster the efficacy of immunotherapy in cancer and mitigate tumor progression supporting activities of MDSC. It also will be outlined, whether application of native or tailored MDSC-Exo might prohibit autoimmune disease progression. These considerations are based on the steadily increasing knowledge on Exo composition, their capacity to distribute throughout the organism combined with selectivity of targeting, and the ease to tailor Exo and includes open questions that answers will facilitate optimizing protocols for a MDSC-Exo blockade in cancer as well as for strengthening their therapeutic efficacy in autoimmune disease.
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Affiliation(s)
- Margot Zöller
- Tumor Cell Biology, University Hospital of Surgery, University of Heidelberg, Heidelberg, Germany
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31
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Adams KR, Chauhan S, Patel DB, Clements VK, Wang Y, Jay SM, Edwards NJ, Ostrand-Rosenberg S, Fenselau C. Ubiquitin Conjugation Probed by Inflammation in Myeloid-Derived Suppressor Cell Extracellular Vesicles. J Proteome Res 2018; 17:315-324. [PMID: 29061044 PMCID: PMC6137330 DOI: 10.1021/acs.jproteome.7b00585] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Ubiquitinated proteins carried by the extracellular vesicles (EV) released by myeloid-derived suppressor cells (MDSC) have been investigated using proteomic strategies to examine the effect of tumor-associated inflammation. EV were collected from MDSC directly following isolation from tumor-bearing mice with low and high inflammation. Among the 1092 proteins (high inflammation) and 925 proteins (low inflammation) identified, more than 50% were observed as ubiquitinated proteoforms. More than three ubiquitin-attachment sites were characterized per ubiquitinated protein, on average. Multiple ubiquitination sites were identified in the pro-inflammatory proteins S100 A8 and S100 A9, characteristic of MDSC and in histones and transcription regulators among other proteins. Spectral counting and pathway analysis suggest that ubiquitination occurs independently of inflammation. Some ubiquitinated proteins were shown to cause the migration of MDSC, which has been previously connected with immune suppression and tumor progression. Finally, MDSC EV are found collectively to carry all the enzymes required to catalyze ubiquitination, and the hypothesis is presented that a portion of the ubiquitinated proteins are produced in situ.
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Affiliation(s)
- Katherine R. Adams
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Sitara Chauhan
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Divya B. Patel
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Virginia K. Clements
- Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, Maryland 21250, United States
| | - Yan Wang
- Proteomic Core Facility, College of Mathematics and Natural Sciences, University of Maryland, College Park, Maryland 20742, United States
| | - Steven M. Jay
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Nathan J. Edwards
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Center, Washington D.C. 20057, United States
| | - Suzanne Ostrand-Rosenberg
- Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, Maryland 21250, United States
| | - Catherine Fenselau
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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32
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Moreno-Gonzalo O, Fernandez-Delgado I, Sanchez-Madrid F. Post-translational add-ons mark the path in exosomal protein sorting. Cell Mol Life Sci 2018; 75:1-19. [PMID: 29080091 PMCID: PMC11105655 DOI: 10.1007/s00018-017-2690-y] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/11/2017] [Accepted: 10/23/2017] [Indexed: 02/07/2023]
Abstract
Extracellular vesicles (EVs) are released by cells to the extracellular environment to mediate inter-cellular communication. Proteins, lipids, nucleic acids and metabolites shuttled in these vesicles modulate specific functions in recipient cells. The enrichment of selected sets of proteins in EVs compared with global cellular levels suggests the existence of specific sorting mechanisms to specify EV loading. Diverse post-translational modifications (PTMs) of proteins participate in the loading of specific elements into EVs. In this review, we offer a perspective on PTMs found in EVs and discuss the specific role of some PTMs, specifically Ubiquitin and Ubiquitin-like modifiers, in exosomal sorting of protein components. The understanding of these mechanisms will provide new strategies for biomedical applications. Examples include the presence of defined PTM marks on EVs as novel biomarkers for the diagnosis and prognosis of certain diseases, or the specific import of immunogenic components into EVs for vaccine generation.
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Affiliation(s)
- Olga Moreno-Gonzalo
- Vascular Pathophysiology Research Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
- Servicio de Inmunología, Instituto Investigación Sanitaria Princesa, Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Irene Fernandez-Delgado
- Vascular Pathophysiology Research Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
- Servicio de Inmunología, Instituto Investigación Sanitaria Princesa, Universidad Autónoma de Madrid (UAM), Madrid, Spain
| | - Francisco Sanchez-Madrid
- Vascular Pathophysiology Research Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain.
- Servicio de Inmunología, Instituto Investigación Sanitaria Princesa, Universidad Autónoma de Madrid (UAM), Madrid, Spain.
- CIBERCV, Madrid, Spain.
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33
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Geis-Asteggiante L, Belew AT, Clements VK, Edwards NJ, Ostrand-Rosenberg S, El-Sayed NM, Fenselau C. Differential Content of Proteins, mRNAs, and miRNAs Suggests that MDSC and Their Exosomes May Mediate Distinct Immune Suppressive Functions. J Proteome Res 2017; 17:486-498. [PMID: 29139296 DOI: 10.1021/acs.jproteome.7b00646] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Myeloid-derived suppressor cells (MDSC) are immature myeloid cells that accumulate in the circulation and the tumor microenvironment of most cancer patients. There, MDSC suppress both adaptive and innate immunity, hindering immunotherapies. The inflammatory milieu often present in cancers facilitates MDSC suppressive activity, causing aggressive tumor progression and metastasis. MDSC from tumor-bearing mice release exosomes, which carry biologically active proteins and mediate some of the immunosuppressive functions characteristic of MDSC. Studies on other cell types have shown that exosomes may also carry RNAs which can be transferred to local and distant cells, yet the mRNA and microRNA cargo of MDSC-derived exosomes has not been studied to date. Here, the cargo of MDSC and their exosomes was interrogated with the goal of identifying and characterizing molecules that may facilitate MDSC suppressive potency. Because inflammation is an established driving force for MDSC suppressive activity, we used the well-established 4T1 mouse mammary carcinoma system, which includes "conventional" as well as "inflammatory" MDSC. We provide evidence that MDSC-derived exosomes carry proteins, mRNAs, and microRNAs with different quantitative profiles than those of their parental cells. Several of these molecules have known or predicted functions consistent with MDSC suppressive activity, suggesting a potential mechanistic redundancy.
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Affiliation(s)
- Lucía Geis-Asteggiante
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
| | - Ashton T Belew
- Department of Cell Biology and Molecular Genetics and Center for Bioinformatics and Computational Biology, University of Maryland , College Park, Maryland 20742, United States
| | - Virginia K Clements
- Department of Biological Sciences, University of Maryland Baltimore County , Baltimore, Maryland 21250, United States
| | - Nathan J Edwards
- Department of Biochemistry, Molecular and Cellular Biology, Georgetown University Medical Center , Washington, D.C. 20007, United States
| | - Suzanne Ostrand-Rosenberg
- Department of Biological Sciences, University of Maryland Baltimore County , Baltimore, Maryland 21250, United States
| | - Najib M El-Sayed
- Department of Cell Biology and Molecular Genetics and Center for Bioinformatics and Computational Biology, University of Maryland , College Park, Maryland 20742, United States
| | - Catherine Fenselau
- Department of Chemistry and Biochemistry, University of Maryland , College Park, Maryland 20742, United States
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34
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Rosa-Fernandes L, Rocha VB, Carregari VC, Urbani A, Palmisano G. A Perspective on Extracellular Vesicles Proteomics. Front Chem 2017; 5:102. [PMID: 29209607 PMCID: PMC5702361 DOI: 10.3389/fchem.2017.00102] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 11/03/2017] [Indexed: 12/15/2022] Open
Abstract
Increasing attention has been given to secreted extracellular vesicles (EVs) in the past decades, especially in the portrayal of their molecular cargo and role as messengers in both homeostasis and pathophysiological conditions. This review presents the state-of-the-art proteomic technologies to identify and quantify EVs proteins along with their PTMs, interacting partners and structural details. The rapid growth of mass spectrometry-based analytical strategies for protein sequencing, PTMs and structural characterization has improved the level of molecular details that can be achieved from limited amount of EVs isolated from different biological sources. Here we will provide a perspective view on the achievements and challenges on EVs proteome characterization using mass spectrometry. A detailed bioinformatics approach will help us to picture the molecular fingerprint of EVs and understand better their pathophysiological function.
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Affiliation(s)
- Livia Rosa-Fernandes
- GlycoProteomics Laboratory, Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Victória Bombarda Rocha
- GlycoProteomics Laboratory, Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | | | - Andrea Urbani
- Proteomic and Metabonomic Laboratory, Fondazione Santa Lucia, Rome, Italy.,Institute of Biochemistry and Biochemical Clinic, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Giuseppe Palmisano
- GlycoProteomics Laboratory, Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Proteomic and Metabonomic Laboratory, Fondazione Santa Lucia, Rome, Italy
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35
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Exosomes miR-126a released from MDSC induced by DOX treatment promotes lung metastasis. Oncogene 2016; 36:639-651. [PMID: 27345402 PMCID: PMC5419051 DOI: 10.1038/onc.2016.229] [Citation(s) in RCA: 157] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 03/14/2016] [Accepted: 05/22/2016] [Indexed: 12/13/2022]
Abstract
Acquired resistance to chemotherapy remains a major stumbling block in cancer treatment. Chronic inflammation plays a crucial role in induction of chemo resistance, and results in part from the induction and expansion of inflammatory cells that include myeloid derived suppressor cells (MDSC) and IL-13+Th2 cells. The mechanisms that lead to induction of activated MDSCs and IL-13+Th2 cells have not yet been identified. Here we demonstrated that doxorubicin treatment of 4T1 breast tumor bearing mice led to the induction of IL-13R+miR-126a+MDSC (DOX-MDSC). DOX-MDSC promote breast tumor lung metastasis through MDSC miR-126a+exosomal mediated induction of IL-13+Th2 cells and tumor angiogenesis. The induction of DOX-MDSC is regulated in a paracrine manner. DOX treatment not only increases IL-33 released from breast tumor cells, which is crucial for the induction of IL-13+Th2 cells, but it also participates in the induction of IL-13 receptors and miR-126a expressed on/in the MDSCs. IL-13 released from IL-13+Th2 cells then promotes the production of DOX-MDSC and MDSC miR-126a+exosomes via MDSC IL-13R. MDSC miR-126a+exosomes further induce IL13+Th2 cells in a positive feed-back loop manner. We also showed that MDSC miR-126a rescues doxorubicin induced MDSC death in a S100A8/A9 dependent manner and promotes tumor angiogenesis. Our findings provide insight into the MDSC exosomal mediated chemo resistance mechanism, which will be useful for the design of inhibitors targeting the blocking of induction of miR-126a+MDSC.
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36
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Xiao H, Tang GX, Wu R. Site-Specific Quantification of Surface N-Glycoproteins in Statin-Treated Liver Cells. Anal Chem 2016; 88:3324-32. [PMID: 26894747 DOI: 10.1021/acs.analchem.5b04871] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The frequent modification of cell-surface proteins by N-linked glycans is known to be correlated with many biological processes. Aberrant glycosylation on surface proteins is associated with different cellular statuses and disease progression. However, it is extraordinarily challenging to comprehensively and site-specifically analyze glycoproteins located only on the cell surface. Currently mass spectrometry (MS)-based proteomics provides the possibility to analyze the N-glycoproteome, but effective separation and enrichment methods are required for the analysis of surface glycoproteins prior to MS measurement. The introduction of bio-orthogonal groups into proteins accelerates research in the robust visualization, identification, and quantification of proteins. Here we have comprehensively evaluated different sugar analogs in the analysis of cell-surface N-glycoproteins by combining copper-free click chemistry and MS-based proteomics. Comparison of three sugar analogs, N-azidoacetylgalactosamine (GalNAz), N-azidoacetylglucosamine (GlcNAz), and N-azidoacetylmannosamine (ManNAz), showed that metabolic labeling with GalNAz resulted in the greatest number of glycoproteins and glycosylation sites in biological duplicate experiments. GalNAz was then employed for the quantification experiment in statin-treated HepG2 liver cells, and 280 unique N-glycosylated sites were quantified from 168 surface proteins. The quantification results demonstrated that many glycosylation sites on surface proteins were down-regulated in statin-treated cells compared to untreated cells because statin prevents the synthesis of dolichol, which is essential for the formation of dolichol-linked precursor oligosaccharides. Several glycosylation sites in proteins that participate in the Alzheimer's disease pathway were down-regulated. This method can be extensively applied for the global analysis of the cell-surface N-glycoproteome.
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Affiliation(s)
- Haopeng Xiao
- School of Chemistry and Biochemistry and the Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - George X Tang
- School of Chemistry and Biochemistry and the Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Ronghu Wu
- School of Chemistry and Biochemistry and the Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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37
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Huebner AR, Cheng L, Somparn P, Knepper MA, Fenton RA, Pisitkun T. Deubiquitylation of Protein Cargo Is Not an Essential Step in Exosome Formation. Mol Cell Proteomics 2016; 15:1556-71. [PMID: 26884507 DOI: 10.1074/mcp.m115.054965] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Indexed: 01/02/2023] Open
Abstract
Exosomes, derived from multivesicular bodies (MVBs), contain proteins and genetic materials from their cell of origin and are secreted from various cells types, including kidney epithelial cells. In general, it is thought that protein cargo is ubiquitylated but that ubiquitin is cleaved by specific deubiquitylases during the process of cargo incorporation into MVBs. Here, we provide direct evidence that, in vivo, deubiquitylation is not essential. Ubiquitin was detected within human MVBs and urinary exosomes by electron microscopy. Of the >6000 proteins identified in human urinary exosomes was mass spectrometry, 15% were ubiquitylated with various topologies (Lys63>Lys48> Lys11>Lys6>Lys29>Lys33>Lys27). A significant preference for basic amino acids upstream of ubiquitylation sites suggests specific ubiquitylation motifs. The current studies demonstrate that, in vivo, deubiquitylation of proteins is not necessary for their incorporation into MVBs and highlight that urinary exosomes are an enriched source for studying ubiquitin modifications in physiological or disease states.
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Affiliation(s)
- Alyssa R Huebner
- From the ‡Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, Denmark
| | - Lei Cheng
- From the ‡Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, Denmark
| | | | - Mark A Knepper
- ¶Epithelial Systems Biology Laboratory, NHLBI, National Institutes of Health, Bethesda, MD 20892-1603
| | - Robert A Fenton
- From the ‡Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, Denmark;
| | - Trairak Pisitkun
- From the ‡Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, Denmark; §Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand;
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38
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Gato M, Blanco-Luquin I, Zudaire M, de Morentin XM, Perez-Valderrama E, Zabaleta A, Kochan G, Escors D, Fernandez-Irigoyen J, Santamaría E. Drafting the proteome landscape of myeloid-derived suppressor cells. Proteomics 2015; 16:367-78. [PMID: 26403437 DOI: 10.1002/pmic.201500229] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 08/18/2015] [Accepted: 09/21/2015] [Indexed: 01/12/2023]
Abstract
Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of cells that are defined by their myeloid origin, immature state, and ability to potently suppress T-cell responses. They regulate immune responses and the population significantly increases in the tumor microenvironment of patients with glioma and other malignant tumors. For their study, MDSCs are usually isolated from the spleen or directly of tumors from a large number of tumor-bearing mice although promising ex vivo differentiated MDSC production systems have been recently developed. During the last years, proteomics has emerged as a powerful approach to analyze MDSCs proteomes using shotgun-based mass spectrometry (MS), providing functional information about cellular homeostasis and metabolic state at a global level. Here, we will revise recent proteome profiling studies performed in MDSCs from different origins. Moreover, we will perform an integrative functional analysis of the protein compilation derived from these large-scale proteomic studies in order to obtain a comprehensive view of MDSCs biology. Finally, we will also discuss the potential application of high-throughput proteomic approaches to study global proteome dynamics and post-translational modifications (PTMs) during the differentiation process of MDSCs that will greatly boost the identification of novel MDSC-specific therapeutic targets to apply in cancer immunotherapy.
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Affiliation(s)
- María Gato
- Immunomodulation Laboratory, Navarrabiomed, Fundación Miguel Servet, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Idoia Blanco-Luquin
- Immunomodulation Laboratory, Navarrabiomed, Fundación Miguel Servet, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Maribel Zudaire
- Immunomodulation Laboratory, Navarrabiomed, Fundación Miguel Servet, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Xabier Martínez de Morentin
- Proteomics Unit, Navarrabiomed, Fundación Miguel Servet, ProteoRed-ISCIII, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Estela Perez-Valderrama
- Proteomics Unit, Navarrabiomed, Fundación Miguel Servet, ProteoRed-ISCIII, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Aintzane Zabaleta
- Biofunctional Nanomaterials Laboratory, CIC Biomagune, San Sebastian, Spain
| | - Grazyna Kochan
- Immunomodulation Laboratory, Navarrabiomed, Fundación Miguel Servet, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - David Escors
- Immunomodulation Laboratory, Navarrabiomed, Fundación Miguel Servet, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Joaquín Fernandez-Irigoyen
- Proteomics Unit, Navarrabiomed, Fundación Miguel Servet, ProteoRed-ISCIII, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Enrique Santamaría
- Proteomics Unit, Navarrabiomed, Fundación Miguel Servet, ProteoRed-ISCIII, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
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Ostrand-Rosenberg S. Tolerance and immune suppression in the tumor microenvironment. Cell Immunol 2015; 299:23-9. [PMID: 26435343 DOI: 10.1016/j.cellimm.2015.09.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Revised: 09/27/2015] [Accepted: 09/27/2015] [Indexed: 12/27/2022]
Abstract
The concept of immunological tolerance has guided and permeated much of modern immunology. Ray Owen's ground-breaking observations in twin cattle provided the first mechanistic explanation for tolerance to self-molecules and established tolerance as a beneficial process that protects the host against autoreactivity. However, his studies also opened the door to understanding that tolerance may be detrimental, such as occurs when cancer cells induce tolerance/immune suppression resulting in inhibition of anti-tumor immunity. This article briefly traces the early history of the field of tumor immunology with respect to tolerance, and then focuses on a relatively recently identified population of cells called myeloid-derived suppressor cells (MDSCs). MDSC are instrumental in causing tolerance/immune suppression in individuals with cancer. They are present in most individuals with cancer and because of their potent immune suppressive activity are a major deterrent to natural anti-tumor immunity and a significant obstacle to immunotherapy.
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Affiliation(s)
- Suzanne Ostrand-Rosenberg
- Dept. of Biological Sciences, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States.
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Burke MC, Wang Y, Lee AE, Dixon EK, Castaneda CA, Fushman D, Fenselau C. Unexpected trypsin cleavage at ubiquitinated lysines. Anal Chem 2015; 87:8144-8. [PMID: 26182167 PMCID: PMC4599693 DOI: 10.1021/acs.analchem.5b01960] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Unexpected tryptic cleavage has been characterized at modified K48 residues in polyubiquitins. In particular, the tryptic products of all seven of the lysine-linked dimers of ubiquitin and of three trimers-linear Ub-(48)Ub-(48)Ub, linear Ub-(63)Ub-(63)Ub, and the branched trimer [Ub]2-(6,48)Ub-have been analyzed. In addition to the peptide products expected under commonly used tryptic conditions, we observe that peptides are formed with an unexpected ε-glycinylglycinyl-Lys carboxyl terminus when the site of linkage is Lys48. Trypsin from three different commercial sources exhibited this aberration. Initial cleavage at R74 is proposed in a distal ubiquitin to produce a glycinylglycinyl-lysine residue which is bound by trypsin.
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Kreimer S, Belov AM, Ghiran I, Murthy SK, Frank DA, Ivanov AR. Mass-spectrometry-based molecular characterization of extracellular vesicles: lipidomics and proteomics. J Proteome Res 2015; 14:2367-84. [PMID: 25927954 DOI: 10.1021/pr501279t] [Citation(s) in RCA: 177] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This review discusses extracellular vesicles (EVs), which are submicron-scale, anuclear, phospholipid bilayer membrane enclosed vesicles that contain lipids, metabolites, proteins, and RNA (micro and messenger). They are shed from many, if not all, cell types and are present in biological fluids and conditioned cell culture media. The term EV, as coined by the International Society of Extracellular Vesicles (ISEV), encompasses exosomes (30-100 nm in diameter), microparticles (100-1000 nm), apoptotic blebs, and other EV subsets. EVs have been implicated in cell-cell communication, coagulation, inflammation, immune response modulation, and disease progression. Multiple studies report that EV secretion from disease-affected cells contributes to disease progression, e.g., tumor niche formation and cancer metastasis. EVs are attractive sources of biomarkers due to their biological relevance and relatively noninvasive accessibility from a range of physiological fluids. This review is focused on the molecular profiling of the protein and lipid constituents of EVs, with emphasis on mass-spectrometry-based "omic" analytical techniques. The challenges in the purification and molecular characterization of EVs, including contamination of isolates and limitations in sample quantities, are discussed along with possible solutions. Finally, the review discusses the limited but growing investigation of post-translational modifications of EV proteins and potential strategies for future in-depth molecular characterization of EVs.
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Affiliation(s)
| | | | - Ionita Ghiran
- ∥Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215, United States
| | | | - David A Frank
- ⊥Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, United States.,#Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, United States
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