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Johansson L, Reyes JF, Ali T, Schätzl H, Gilch S, Hallbeck M. Lack of cellular prion protein causes Amyloid β accumulation, increased extracellular vesicle abundance, and changes to exosome biogenesis proteins. Mol Cell Biochem 2024:10.1007/s11010-024-05059-0. [PMID: 38970706 DOI: 10.1007/s11010-024-05059-0] [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: 04/27/2024] [Accepted: 06/29/2024] [Indexed: 07/08/2024]
Abstract
Alzheimer's disease (AD) progression is closely linked to the propagation of pathological Amyloid β (Aβ), a process increasingly understood to involve extracellular vesicles (EVs), namely exosomes. The specifics of Aβ packaging into exosomes remain elusive, although evidence suggests an ESCRT (Endosomal Sorting Complex Required for Transport)-independent origin to be responsible in spreading of AD pathogenesis. Intriguingly, PrPC, known to influence exosome abundance and bind oligomeric Aβ (oAβ), can be released in exosomes via both ESCRT-dependent and ESCRT-independent pathways, raising questions about its role in oAβ trafficking. Thus, we quantified Aβ levels within EVs, cell medium, and intracellularly, alongside exosome biogenesis-related proteins, following deletion or overexpression of PrPC. The same parameters were also evaluated in the presence of specific exosome inhibitors, namely Manumycin A and GW4869. Our results revealed that deletion of PrPC increases intracellular Aβ accumulation and amplifies EV abundance, alongside significant changes in cellular levels of exosome biogenesis-related proteins Vps25, Chmp2a, and Rab31. In contrast, cellular expression of PrPC did not alter exosomal Aβ levels. This highlights PrPC's influence on exosome biogenesis, albeit not in direct Aβ packaging. Additionally, our data confirm the ESCRT-independent exosome release of Aβ and we show a direct reduction in Chmp2a levels upon oAβ challenge. Furthermore, inhibition of opposite exosome biogenesis pathway resulted in opposite cellular PrPC levels. In conclusion, our findings highlight the intricate relationship between PrPC, exosome biogenesis, and Aβ release. Specifically, they underscore PrPC's critical role in modulating exosome-associated proteins, EV abundance, and cellular Aβ levels, thereby reinforcing its involvement in AD pathogenesis.
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Affiliation(s)
- Lovisa Johansson
- Department of Biomedical and Clinical Sciences and Department of Clinical Pathology, Linköping University, Linköping, Sweden.
| | - Juan F Reyes
- Department of Biomedical and Clinical Sciences and Department of Clinical Pathology, Linköping University, Linköping, Sweden
| | - Tahir Ali
- Calgary Prion Research Unit, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Hermann Schätzl
- Calgary Prion Research Unit, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Sabine Gilch
- Calgary Prion Research Unit, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Martin Hallbeck
- Department of Biomedical and Clinical Sciences and Department of Clinical Pathology, Linköping University, Linköping, Sweden.
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2
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Shahi S, Kang T, Fonseka P. Extracellular Vesicles in Pathophysiology: A Prudent Target That Requires Careful Consideration. Cells 2024; 13:754. [PMID: 38727289 PMCID: PMC11083420 DOI: 10.3390/cells13090754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 04/22/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024] Open
Abstract
Extracellular vesicles (EVs) are membrane-bound particles released by cells to perform multitudes of biological functions. Owing to their significant implications in diseases, the pathophysiological role of EVs continues to be extensively studied, leading research to neglect the need to explore their role in normal physiology. Despite this, many identified physiological functions of EVs, including, but not limited to, tissue repair, early development and aging, are attributed to their modulatory role in various signaling pathways via intercellular communication. EVs are widely perceived as a potential therapeutic strategy for better prognosis, primarily through utilization as a mode of delivery vehicle. Moreover, disease-associated EVs serve as candidates for the targeted inhibition by pharmacological or genetic means. However, these attempts are often accompanied by major challenges, such as off-target effects, which may result in adverse phenotypes. This renders the clinical efficacy of EVs elusive, indicating that further understanding of the specific role of EVs in physiology may enhance their utility. This review highlights the essential role of EVs in maintaining cellular homeostasis under different physiological settings, and also discusses the various aspects that may potentially hinder the robust utility of EV-based therapeutics.
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Affiliation(s)
| | | | - Pamali Fonseka
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC 3086, Australia; (S.S.); (T.K.)
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Liu J, Tan J, Tang B, Guo J. Unveiling the role of iPLA 2β in neurodegeneration: From molecular mechanisms to advanced therapies. Pharmacol Res 2024; 202:107114. [PMID: 38395207 DOI: 10.1016/j.phrs.2024.107114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 02/08/2024] [Accepted: 02/20/2024] [Indexed: 02/25/2024]
Abstract
Calcium-independent phospholipase A2β (iPLA2β), a member of the phospholipase A2 (PLA2s) superfamily, is encoded by the PLA2G6 gene. Mutations in the PLA2G6 gene have been identified as the primary cause of infantile neuroaxonal dystrophy (INAD) and, less commonly, as a contributor to Parkinson's disease (PD). Recent studies have revealed that iPLA2β deficiency leads to neuroinflammation, iron accumulation, mitochondrial dysfunction, lipid dysregulation, and other pathological changes, forming a complex pathogenic network. These discoveries shed light on potential mechanisms underlying PLA2G6-associated neurodegeneration (PLAN) and offer valuable insights for therapeutic development. This review provides a comprehensive analysis of the fundamental characteristics of iPLA2β, its association with neurodegeneration, the pathogenic mechanisms involved in PLAN, and potential targets for therapeutic intervention. It offers an overview of the latest advancements in this field, aiming to contribute to ongoing research endeavors and facilitate the development of effective therapies for PLAN.
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Affiliation(s)
- Jiabin Liu
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jieqiong Tan
- Centre for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan 410008, China
| | - Beisha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China; Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jifeng Guo
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China; Centre for Medical Genetics and Hunan Key Laboratory of Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China.
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4
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Kalinichenko LS, Kohl Z, Mühle C, Hassan Z, Hahn A, Schmitt EM, Macht K, Stoyanov L, Moghaddami S, Bilbao R, Eulenburg V, Winkler J, Kornhuber J, Müller CP. Sex-specific pleiotropic changes in emotional behavior and alcohol consumption in human α-synuclein A53T transgenic mice during early adulthood. J Neurochem 2024; 168:269-287. [PMID: 38284431 DOI: 10.1111/jnc.16051] [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: 07/18/2023] [Revised: 12/15/2023] [Accepted: 01/07/2024] [Indexed: 01/30/2024]
Abstract
Point mutations in the α-synuclein coding gene may lead to the development of Parkinson's disease (PD). PD is often accompanied by other psychiatric conditions, such as anxiety, depression, and drug use disorders, which typically emerge in adulthood. Some of these point mutations, such as SNCA and A30T, have been linked to behavioral effects that are not commonly associated with PD, especially regarding alcohol consumption patterns. In this study, we investigated whether the familial PD point mutation A53T is associated with changes in alcohol consumption behavior and emotional states at ages not yet characterized by α-synuclein accumulation. The affective and alcohol-drinking phenotypes remained unaltered in female PDGF-hA53T-synuclein-transgenic (A53T) mice during both early and late adulthood. Brain region-specific activation of ceramide-producing enzymes, acid sphingomyelinase (ASM), and neutral sphingomyelinase (NSM), known for their neuroprotective properties, was observed during early adulthood but not in late adulthood. In males, the A53T mutation was linked to a reduction in alcohol consumption in both early and late adulthood. However, male A53T mice displayed increased anxiety- and depression-like behaviors during both early and late adulthood. Enhanced ASM activity in the dorsal mesencephalon and ventral hippocampus may potentially contribute to these adverse behavioral effects of the mutation in males during late adulthood. In summary, the A53T gene mutation was associated with diverse changes in emotional states and alcohol consumption behavior long before the onset of PD, and these effects varied by sex. These alterations in behavior may be linked to changes in brain ceramide metabolism.
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Affiliation(s)
- Liubov S Kalinichenko
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Zacharias Kohl
- Division of Molecular Neurology, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
- Center for Rare Diseases Erlangen (ZSEER), University Hospital Erlangen, Erlangen, Germany
- Department of Neurology, University of Regensburg, Regensburg, Germany
| | - Christiane Mühle
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Zurina Hassan
- Centre for Drug Research, Universiti Sains Malaysia, Penang, Malaysia
| | - Agnes Hahn
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Eva-Maria Schmitt
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Kilian Macht
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Lyubomir Stoyanov
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Schayan Moghaddami
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Roberto Bilbao
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Volker Eulenburg
- Department for Anesthesiology and Intensive Care, Faculty of Medicine, University of Leipzig, Leipzig, Germany
| | - Jürgen Winkler
- Division of Molecular Neurology, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
- Center for Rare Diseases Erlangen (ZSEER), University Hospital Erlangen, Erlangen, Germany
| | - Johannes Kornhuber
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Christian P Müller
- Department of Psychiatry and Psychotherapy, University Clinic, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
- Centre for Drug Research, Universiti Sains Malaysia, Penang, Malaysia
- Institute of Psychopharmacology, Central Institute of Mental Health, Faculty of Medicine Mannheim, University of Heidelberg, Heidelberg, Germany
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5
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Varela YR, Iriondo MN, Goñi FM, Alonso A, Montes LR. Ceramide regulation of autophagy: A biophysical approach. Biochim Biophys Acta Mol Cell Biol Lipids 2024; 1869:159444. [PMID: 38056762 DOI: 10.1016/j.bbalip.2023.159444] [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: 11/06/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 12/08/2023]
Abstract
Specific membrane lipids play unique roles in (macro)autophagy. Those include phosphatidylethanolamine, to which LC3/GABARAP autophagy proteins become covalently bound in the process, or cardiolipin, an important effector in mitochondrial autophagy (or mitophagy). Ceramide (Cer), or N-acyl sphingosine, is one of the simplest sphingolipids, known as a stress signal in the apoptotic pathway. Moreover, Cer is increasingly being recognized as an autophagy activator, although its mechanism of action is unclear. In the present review, the proposed Cer roles in autophagy are summarized, together with some biophysical properties of Cer in membranes. Possible pathways for Cer activation of autophagy are discussed, including specific protein binding of the lipid, and Cer-dependent perturbation of bilayer properties. Cer generation of lateral inhomogeneities (domain formation) is given special attention. Recent biophysical results, including fluorescence and atomic force microscopy data, show Cer-promoted enhanced binding of LC3/GABARAP to lipid bilayers. These observations could be interpreted in terms of the putative formation of Cer-rich nanodomains.
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Affiliation(s)
- Yaiza R Varela
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, 48940 Leioa, Spain
| | - Marina N Iriondo
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, 48940 Leioa, Spain
| | - Félix M Goñi
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, 48940 Leioa, Spain
| | - Alicia Alonso
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, 48940 Leioa, Spain.
| | - L Ruth Montes
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, 48940 Leioa, Spain
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6
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Pilátová MB, Solárová Z, Mezencev R, Solár P. Ceramides and their roles in programmed cell death. Adv Med Sci 2023; 68:417-425. [PMID: 37866204 DOI: 10.1016/j.advms.2023.10.004] [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: 03/07/2023] [Revised: 08/14/2023] [Accepted: 10/13/2023] [Indexed: 10/24/2023]
Abstract
Programmed cell death plays a crucial role in maintaining the homeostasis and integrity of multicellular organisms, and its dysregulation contributes to the pathogenesis of many diseases. Programmed cell death is regulated by a range of macromolecules and low-molecular messengers, including ceramides. Endogenous ceramides have different functions, that are influenced by their localization and the presence of their target molecules. This article provides an overview of the current understanding of ceramides and their impact on various types of programmed cell death, including apoptosis, anoikis, macroautophagy and mitophagy, and necroptosis. Moreover, it highlights the emergence of dihydroceramides as a new class of bioactive sphingolipids and their downstream targets as well as their future roles in cancer cell growth, drug resistance and tumor metastasis.
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Affiliation(s)
- Martina Bago Pilátová
- Department of Pharmacology, Faculty of Medicine, P.J. Šafárik University, Košice, Slovak Republic
| | - Zuzana Solárová
- Department of Pharmacology, Faculty of Medicine, P.J. Šafárik University, Košice, Slovak Republic
| | - Roman Mezencev
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Peter Solár
- Department of Medical Biology, Faculty of Medicine, P.J. Šafárik University, Košice, Slovak Republic.
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7
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Kanaji S, Chen W, Morodomi Y, Shapiro R, Kanaji T, Yang XL. Mechanistic perspectives on anti-aminoacyl-tRNA synthetase syndrome. Trends Biochem Sci 2023; 48:288-302. [PMID: 36280495 PMCID: PMC9974581 DOI: 10.1016/j.tibs.2022.09.011] [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: 06/01/2022] [Revised: 09/28/2022] [Accepted: 09/29/2022] [Indexed: 02/18/2023]
Abstract
Antisynthetase syndrome (ASSD) is an autoimmune disease characterized by circulating autoantibodies against one of eight aminoacyl-tRNA synthetases (aaRSs). Although these autoantibodies are believed to play critical roles in ASSD pathogenesis, the nature of their roles remains unclear. Here we describe ASSD pathogenesis and discuss ASSD-linked aaRSs - from the WHEP domain that may impart immunogenicity to the role of tRNA in eliciting the innate immune response and the secretion of aaRSs from cells. Through these explorations, we propose that ASSD pathogenesis involves the tissue-specific secretion of aaRSs and that extracellular tRNAs or tRNA fragments and their ability to engage Toll-like receptor signaling may be important disease factors.
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Affiliation(s)
- Sachiko Kanaji
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Wenqian Chen
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Yosuke Morodomi
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Ryan Shapiro
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Taisuke Kanaji
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Xiang-Lei Yang
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Chen L, Xie W, Wu K, Meng Y, He Y, Cai J, Jiang Y, Zhao Q, Yang Y, Zhang M, Lu M, Lin S, Liang L, Zhang Z. Continuous nutrient supply culture strategy controls multivesicular endosomes pathway and anti-photo-aging miRNA cargo loading of extracellular vesicles. J Tissue Eng 2023; 14:20417314231197604. [PMID: 37674933 PMCID: PMC10478562 DOI: 10.1177/20417314231197604] [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: 04/28/2023] [Accepted: 08/11/2023] [Indexed: 09/08/2023] Open
Abstract
Extracellular vesicle (EV) therapy recently had shown significant efficacy in various diseases. Serum starvation culture (SC) is one of the most widely used methods for collecting EVs. However, SC may cause inadvertent effects and eventually dampen the therapeutic potential of EVs. Therefore, we developed a novel method for EV collection, continuous nutrient supply culture (CC), which can provide an optimal condition for mesenchymal stem cells (MSCs) by continuously supplying essential nutrients to MSCs. By comparing with SC strategy, we revealed that CC could maintain CC-MSCs in a normal autophagy and apoptotic state, which reduced the shunting of EV precursors in cells and useless information material carried by EVs. In CC-MSCs, the expression levels of endosomal sorting complexes required for transport (ESCRT) and targeting GTPase27 (Rab27) were upregulated compared to those in SC-MSCs. Besides, we analyzed the membrane transport efficiency of EV formation, which demonstrated the CC strategy could promote the formation of EV precursors and the release of EVs. In addition, miRNA analysis revealed that CC-EVs were enriched with anti-chronic inflammatory factors, which could inhibit the nuclear factor kappa-B (NF-κB) pathway, mitigate chronic inflammation, and effectively repair skin photo-aging damage.
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Affiliation(s)
- Lihao Chen
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Weihan Xie
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Keke Wu
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yuan Meng
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yijun He
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Jiawei Cai
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yuan Jiang
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Qi Zhao
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yixi Yang
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Minru Zhang
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Manping Lu
- Yue Dong Hospital District of Third Affiliated Hospital of Sun Yat-Sen University, Meizhou, Guangdong, China
| | - Shaozhang Lin
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Lin Liang
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Zhiyong Zhang
- Translational Research Centre of Regenerative Medicine and 3D Printing of Guangzhou Medical University, Guangdong Province Engineering Research Center for Biomedical Engineering, State Key Laboratory of Respiratory Disease, Department of Orthopaedic Surgery, Medical Technology and Related Equipment Research for Spinal Injury Treatment, City Key Laboratory, The Third Affiliated Hospital of Guangzhou Medical University, School of Biomedical Engineering, Guangzhou Medical University, Guangzhou, Guangdong, China
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9
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Hosseini R, Asef-Kabiri L, Sarvnaz H, Ghanavatinejad A, Rezayat F, Eskandari N, Akbari ME. Blockade of exosome release alters HER2 trafficking to the plasma membrane and gives a boost to Trastuzumab. CLINICAL & TRANSLATIONAL ONCOLOGY : OFFICIAL PUBLICATION OF THE FEDERATION OF SPANISH ONCOLOGY SOCIETIES AND OF THE NATIONAL CANCER INSTITUTE OF MEXICO 2023; 25:185-198. [PMID: 36018441 DOI: 10.1007/s12094-022-02925-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 08/05/2022] [Indexed: 01/07/2023]
Abstract
OBJECTIVE(S) Exosomal HER2 has been evidenced to interfere with antibody-induced anti-tumor effects. However, whether the blockade of HER2+ exosomes release would affect antibody-mediated tumor inhibition has yet to be investigated. METHODS Exosomes derived from BT-474, SK-BR3 and SK-OV3 (HER2-overexpressing tumor cells) and MDA-MB-231 cells (HER2 negative) were purified and characterized by bicinchoninic acid (BCA) assay, western blotting and Transmission electron microscopy (TEM). Inhibition of exosome release was achieved by neutral sphingomyelinase-2 (nSMase-2) inhibitor, GW4869. The effects of exosome blockade on the anti-proliferative effects, apoptosis induction, and antibody-mediated cellular cytotoxicity (ADCC) activity of Trastuzumab were examined using MTT, flow cytometry, and LDH release assays. Also, the effects of exosome inhibition on the surface expression and endocytosis/internalization of HER2 were studied by flow cytometry. RESULTS Purified exosomes derived from HER2 overexpressing cancer cells were positive for HER2 protein. Blockade of exosome release was able to significantly improve apoptosis induction, anti-proliferative and ADCC responses of Trastuzumab dose dependently. The pretreatment of Trastuzumab/purified NK cells, but not PBMCs, with HER2+ exosomes could also decrease the ADCC effects of Trastuzumab. Exosome inhibition also remarkably downregulated surface HER2 levels in a time-dependent manner, but does not affect its endocytosis/internalization. CONCLUSION Based on our findings, HER2+ exosomes may benefit tumor progression by dually suppressing Trastuzumab-induced tumor growth inhibition and cytotoxicity of NK cells. It seems that concomitant blocking of exosome release might be an effective approach for improving the therapeutic effects of Trastuzumab, and potentially other HER2-directed mAbs. In addition, the exosome secretion pathway possibly contributes to the HER2 trafficking to plasma membrane, since the blockade of exosome secretion decreased surface HER2 levels.
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Affiliation(s)
- Reza Hosseini
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Leila Asef-Kabiri
- Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamzeh Sarvnaz
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Alireza Ghanavatinejad
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Rezayat
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Nahid Eskandari
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
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10
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William S, Duncan T, Redmond TM. Pretreatment of human retinal pigment epithelial cells with sterculic acid forestalls fenretinide-induced apoptosis. Sci Rep 2022; 12:22442. [PMID: 36575190 PMCID: PMC9794835 DOI: 10.1038/s41598-022-26383-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 12/14/2022] [Indexed: 12/28/2022] Open
Abstract
The ratio of saturated to monounsaturated fatty acids, thought to play a critical role in many cellular functions, is regulated by stearoyl-CoA desaturase (SCD), a rate-limiting enzyme in the biosynthesis of monounsaturated fatty acids. Previously, we observed a decrease in both SCD protein and enzymatic activity in apoptosis induced by fenretinide, a synthetic analog of retinoic acid, in the human retinal pigment epithelial (RPE) cell line ARPE-19. Here, we investigated the effect of pretreating ARPE-19 with sterculic acid, a cyclopropenoic fatty acid inhibitor of SCD, on preventing fenretinide-induced apoptosis, given the role of SCD in cell proliferation and apoptosis. We show that sterculic acid pretreatment prevents the effects of fenretinide-induced apoptosis shown by changes in cell morphology, viability, and caspase-3 activation. Analysis of endoplasmic reticulum (ER)-associated proteins shows that sterculic acid pretreatment reduced the fenretinide-induced upregulation of heme oxygenase-1, ATF3 and GADD153 expression that are in response to reactive oxygen species (ROS) generation. Sterculic acid is as effective as allopurinol in inhibition of xanthine oxidase (XDH), and this may play a role in reducing the potential role of XDH in fenretinide-induced ROS generation. Sterculic acid pretreatment also results in a reduction in SOD2 mRNA expression. Dihydroceramide accumulation, compared to ceramide, and ROS generation indicate that a ceramide-independent pathway mediates fenretinide-induced apoptosis, and ROS mediation is borne out by activation of the NF-κBp50 and NF-κBp65 downstream signaling cascade. Its prevention by sterculic acid pretreatment further indicates the latter's antioxidant/anti-inflammatory effect. Taken together, our results suggest that sterculic acid pretreatment can mitigate ROS-mediated fenretinide-induced apoptosis. Thus, sterculic acid may serve as a potential antioxidant and therapeutic agent. These effects may be independent of its effects on SCD activity.
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Affiliation(s)
- Samuel William
- grid.280030.90000 0001 2150 6316Laboratory of Retinal Cell and Molecular Biology, Bldg. 6/Room 112A, National Eye Institute, National Institutes of Health, 6 Center Drive, Bethesda, MD 20892-0608 USA
| | - Todd Duncan
- grid.280030.90000 0001 2150 6316Laboratory of Retinal Cell and Molecular Biology, Bldg. 6/Room 112A, National Eye Institute, National Institutes of Health, 6 Center Drive, Bethesda, MD 20892-0608 USA
| | - T. Michael Redmond
- grid.280030.90000 0001 2150 6316Laboratory of Retinal Cell and Molecular Biology, Bldg. 6/Room 112A, National Eye Institute, National Institutes of Health, 6 Center Drive, Bethesda, MD 20892-0608 USA
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11
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Intercellular transfer of activated STING triggered by RAB22A-mediated non-canonical autophagy promotes antitumor immunity. Cell Res 2022; 32:1086-1104. [PMID: 36280710 PMCID: PMC9715632 DOI: 10.1038/s41422-022-00731-w] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 09/16/2022] [Indexed: 01/31/2023] Open
Abstract
STING, an endoplasmic reticulum (ER) transmembrane protein, mediates innate immune activation upon cGAMP stimulation and is degraded through autophagy. Here, we report that activated STING could be transferred between cells to promote antitumor immunity, a process triggered by RAB22A-mediated non-canonical autophagy. Mechanistically, RAB22A engages PI4K2A to generate PI4P that recruits the Atg12-Atg5-Atg16L1 complex, inducing the formation of ER-derived RAB22A-mediated non-canonical autophagosome, in which STING activated by agonists or chemoradiotherapy is packaged. This RAB22A-induced autophagosome fuses with RAB22A-positive early endosome, generating a new organelle that we name Rafeesome (RAB22A-mediated non-canonical autophagosome fused with early endosome). Meanwhile, RAB22A inactivates RAB7 to suppress the fusion of Rafeesome with lysosome, thereby enabling the secretion of the inner vesicle of the autophagosome bearing activated STING as a new type of extracellular vesicle that we define as R-EV (RAB22A-induced extracellular vesicle). Activated STING-containing R-EVs induce IFNβ release from recipient cells to the tumor microenvironment, promoting antitumor immunity. Consistently, RAB22A enhances the antitumor effect of the STING agonist diABZI in mice, and a high RAB22A level predicts good survival in nasopharyngeal cancer patients treated with chemoradiotherapy. Our findings reveal that Rafeesome regulates the intercellular transfer of activated STING to trigger and spread antitumor immunity, and that the inner vesicle of non-canonical autophagosome originated from ER is secreted as R-EV, providing a new perspective for understanding the intercellular communication of organelle membrane proteins.
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12
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Gurunathan S, Kim JH. Graphene Oxide Enhances Biogenesis and Release of Exosomes in Human Ovarian Cancer Cells. Int J Nanomedicine 2022; 17:5697-5731. [PMID: 36466784 PMCID: PMC9717435 DOI: 10.2147/ijn.s385113] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 11/04/2022] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND Exosomes, which are nanovesicles secreted by almost all the cells, mediate intercellular communication and are involved in various physiological and pathological processes. We aimed to investigate the effects of graphene oxide (GO) on the biogenesis and release of exosomes in human ovarian cancer (SKOV3) cells. METHODS Exosomes were isolated using ultracentrifugation and ExoQuick and characterized by various analytical techniques. The expression levels of exosome markers were analyzed via quantitative reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay. RESULTS Graphene oxide (10-50 μg/mL), cisplatin (2-10 μg/mL), and C6-ceramide (5-25 μM) inhibited the cell viability, proliferation, and cytotoxicity in a dose-dependent manner. We observed that graphene oxide (GO), cisplatin (CIS), and C6-Ceramide (C6-Cer) stimulated acetylcholine esterase and neutral sphingomyelinase activity, total exosome protein concentration, and exosome counts associated with increased level of apoptosis, oxidative stress and endoplasmic reticulum stress. In contrast, GW4869 treatment inhibits biogenesis and release of exosomes. We observed that the human ovarian cancer cells secreted exosomes with typical cup-shaped morphology and surface protein biomarkers. The expression levels of TSG101, CD9, CD63, and CD81 were significantly higher in GO-treated cells than in control cells. Further, cytokine and chemokine levels were significantly higher in exosomes isolated from GO-treated SKOV3 cells than in those isolated from control cells. SKOV3 cells pre-treated with N-acetylcysteine or GW4869 displayed a significant reduction in GO-induced exosome biogenesis and release. Furthermore, endocytic inhibitors decrease exosome biogenesis and release by impairing endocytic pathways. CONCLUSION This study identifies GO as a potential tool for targeting the exosome pathway and stimulating exosome biogenesis and release. We believe that the knowledge acquired in this study can be potentially extended to other exosome-dominated pathologies and model systems. Furthermore, these nanoparticles can provide a promising means to enhance exosome production in SKOV3 cells.
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Affiliation(s)
- Sangiliyandi Gurunathan
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul, 05029, Korea
| | - Jin Hoi Kim
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul, 05029, Korea
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13
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Pathological Contribution of Extracellular Vesicles and Their MicroRNAs to Progression of Chronic Liver Disease. BIOLOGY 2022; 11:biology11050637. [PMID: 35625364 PMCID: PMC9137620 DOI: 10.3390/biology11050637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/16/2022] [Accepted: 04/20/2022] [Indexed: 11/16/2022]
Abstract
Simple Summary Extracellular vesicles (EVs) are membrane-enclosed vesicles secreted from most types of cells. EVs encapsulate many diverse bioactive cargoes, such as proteins and nucleic acid, of parental cells and delivers them to recipient cells. Upon injury, the contents altered by cellular stress are delivered into target cells and affect their physiological properties, spreading the disease microenvironment to exacerbate disease progression. Therefore, EVs are emerging as good resources for studying the pathophysiological mechanisms of diseases because they reflect the characteristics of donor cells and play a central role in intercellular communication. Chronic liver disease affects millions of people worldwide and has a high mortality rate. In chronic liver disease, the production and secretion of EVs are significantly elevated, and increased and altered cargoes are packed into EVs, enhancing inflammation, fibrosis, and angiogenesis. Herein, we review EVs released under specific chronic liver disease and explain how EVs are involved in intercellular communication to aggravate liver disease. Abstract Extracellular vesicles (EVs) are membrane-bound endogenous nanoparticles released by the majority of cells into the extracellular space. Because EVs carry various cargo (protein, lipid, and nucleic acids), they transfer bioinformation that reflects the state of donor cells to recipient cells both in healthy and pathologic conditions, such as liver disease. Chronic liver disease (CLD) affects numerous people worldwide and has a high mortality rate. EVs released from damaged hepatic cells are involved in CLD progression by impacting intercellular communication between EV-producing and EV-receiving cells, thereby inducing a disease-favorable microenvironment. In patients with CLD, as well as in the animal models of CLD, the levels of released EVs are elevated. Furthermore, these EVs contain high levels of factors that accelerate disease progression. Therefore, it is important to understand the diverse roles of EVs and their cargoes to treat CLD. Herein, we briefly explain the biogenesis and types of EVs and summarize current findings presenting the role of EVs in the pathogenesis of CLD. As the role of microRNAs (miRNAs) within EVs in liver disease is well documented, the effects of miRNAs detected in EVs on CLD are reviewed. In addition, we discuss the therapeutic potential of EVs to treat CLD.
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14
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Monaco F, De Conti L, Vodret S, Zanotta N, Comar M, Manzotti S, Rubini C, Graciotti L, Fulgenzi G, Bovenzi M, Baralle M, Tomasetti M, Santarelli L. Force-feeding malignant mesothelioma stem-cell like with exosome-delivered miR-126 induces tumour cell killing. Transl Oncol 2022; 20:101400. [PMID: 35334283 PMCID: PMC8956928 DOI: 10.1016/j.tranon.2022.101400] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 03/11/2022] [Indexed: 11/28/2022] Open
Abstract
Exosome-enriched miR-126 (exo-miR) induced mass disaggregation of MPM-derived spheroids. Exo-miR plus the inhibitor of exosome release (GW4869) accumulated miR-126 within cells. Exo-miR plus GW4869 induced MPM-stem cell like death and in vivo tumour growth arrest. MiR-126 accumulated in cells induced a protective autophagy which was inhibited by GW4869. Exo-miR plus GW4869 induced a metabolic crisis, thus promoting necroptosis activation.
Malignant pleural mesothelioma (MPM) is an aggressive tumour resistant to treatments. It has been postulated that cancer stem cells (CSCs) persist in tumours causing relapse after multimodality treatment. In the present study, a novel miRNA-based therapy approach is proposed. MPM-derived spheroids have been treated with exosome-delivered miR-126 (exo-miR) and evaluated for their anticancer effect. The exo-miR treatment increased MPM stem-cell like stemness and inhibited cell proliferation. However, at a prolonged time, the up taken miR-126 was released by the cells themselves through exosomes; the inhibition of exosome release by an exosome release inhibitor GW4869 induced miR-126 intracellular accumulation leading to massive cell death and in vivo tumour growth arrest. Autophagy is involved in these processes; miR-126 accumulation induced a protective autophagy and the inhibition of this process by GW4869 generates a metabolic crisis that promotes necroptosis, which was associated with PARP-1 over-expression and cyt-c and AIF release. Here, for the first time, we proposed a therapy against CSCs, a heterogeneous cell population involved in cancer development and relapse.
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Affiliation(s)
- Federica Monaco
- Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy; Department of Excellence SBSP-Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Laura De Conti
- RNA biology Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Simone Vodret
- Cardiovascular Biology Laboratory, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Nunzia Zanotta
- Institute for Maternal and Child Health - IRCCS "Burlo Garofolo", Trieste, Italy
| | - Manola Comar
- Institute for Maternal and Child Health - IRCCS "Burlo Garofolo", Trieste, Italy
| | - Sandra Manzotti
- Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Corrado Rubini
- Department of Excellence SBSP-Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Laura Graciotti
- Department of Excellence SBSP-Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Gianluca Fulgenzi
- Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Massimo Bovenzi
- Department of Medical Sciences, Clinical Unit of Occupational Medicine, University of Trieste, Trieste, Italy
| | - Marco Baralle
- RNA biology Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Marco Tomasetti
- Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy.
| | - Lory Santarelli
- Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
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15
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Makhijani P, McGaha TL. Myeloid Responses to Extracellular Vesicles in Health and Disease. Front Immunol 2022; 13:818538. [PMID: 35320943 PMCID: PMC8934876 DOI: 10.3389/fimmu.2022.818538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 02/15/2022] [Indexed: 01/04/2023] Open
Abstract
Extracellular vesicles are mediators of cell-cell communication playing a key role in both steady-state and disease conditions. Extracellular vesicles carry diverse donor-derived cargos, including DNA, RNA, proteins, and lipids that induce a complex network of signals in recipient cells. Due to their ability to capture particulate matter and/or capacity to polarize and orchestrate tissue responses, myeloid immune cells (e.g., dendritic cells, macrophages, etc.) rapidly respond to extracellular vesicles, driving local and systemic effects. In cancer, myeloid-extracellular vesicle communication contributes to chronic inflammation, self-tolerance, and therapeutic resistance while in autoimmune disease, extracellular vesicles support inflammation and tissue destruction. Here, we review cellular mechanisms by which extracellular vesicles modulate myeloid immunity in cancer and autoimmune disease, highlighting some contradictory results and outstanding questions. We will also summarize how understanding of extracellular vesicle biology is being utilized for novel therapeutic and diagnostic applications.
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Affiliation(s)
- Priya Makhijani
- Department of Immunology, University of Toronto, Toronto, ON, Canada
- Tumor Immunotherapy Program, Princess Margaret Cancer Center, University Health Network, Toronto, ON, Canada
| | - Tracy L. McGaha
- Department of Immunology, University of Toronto, Toronto, ON, Canada
- Tumor Immunotherapy Program, Princess Margaret Cancer Center, University Health Network, Toronto, ON, Canada
- *Correspondence: Tracy L. McGaha,
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Burbidge K, Rademacher DJ, Mattick J, Zack S, Grillini A, Bousset L, Kwon O, Kubicki K, Simon A, Melki R, Campbell EM. LGALS3 (galectin 3) mediates an unconventional secretion of SNCA/α-synuclein in response to lysosomal membrane damage by the autophagic-lysosomal pathway in human midbrain dopamine neurons. Autophagy 2021; 18:1020-1048. [PMID: 34612142 PMCID: PMC9196737 DOI: 10.1080/15548627.2021.1967615] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Numerous lines of evidence support the premise that the misfolding and subsequent accumulation of SNCA/α-synuclein (synuclein alpha) is responsible for the underlying neuronal pathology observed in Parkinson disease (PD) and other synucleinopathies. Moreover, the cell-to-cell transfer of these misfolded SNCA species is thought to be responsible for disease progression and the spread of cellular pathology throughout the brain. Previous work has shown that when exogenous, misfolded SNCA fibrils enter cells through endocytosis, they can damage and rupture the membranes of their endocytotic vesicles in which they are trafficked. Rupture of these vesicular membranes exposes intralumenal glycans leading to galectin protein binding, subsequent autophagic protein recruitment, and, ultimately, their introduction into the autophagic-lysosomal pathway. Increasing evidence indicates that both pathological and non-pathological SNCA species undergo autophagy-dependent unconventional secretion. While other proteins have also been shown to be secreted from cells by autophagy, what triggers this release process and how these specific proteins are recruited to a secretory autophagic pathway is largely unknown. Here, we use a human midbrain dopamine (mDA) neuronal culture model to provide evidence in support of a cellular mechanism that explains the cell-to-cell transfer of pathological forms of SNCA that are observed in PD. We demonstrate that LGALS3 (galectin 3) mediates the release of SNCA following vesicular damage. SNCA release is also dependent on TRIM16 (tripartite motif containing 16) and ATG16L1 (autophagy related 16 like 1), providing evidence that secretion of SNCA is mediated by an autophagic secretory pathway.
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Affiliation(s)
- Kevin Burbidge
- Graduate Program in Neuroscience, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA
| | - David J Rademacher
- Core Imaging Facility and Department of Microbiology and Immunology, Loyola University of Chicago, Maywood, Illinois, USA
| | - Jessica Mattick
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University, Chicago, Maywood, Illinois, USA
| | - Stephanie Zack
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University, Chicago, Maywood, Illinois, USA
| | - Andrea Grillini
- Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA
| | - Luc Bousset
- Institut Francois Jacob (Mircen), Cea and Laboratory of Neurodegenerative Diseases, Cnrs, Fontenay-Aux-Roses Cedex, France
| | - Ochan Kwon
- Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA
| | - Konrad Kubicki
- Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA
| | - Alexander Simon
- Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA
| | - Ronald Melki
- Institut Francois Jacob (Mircen), Cea and Laboratory of Neurodegenerative Diseases, Cnrs, Fontenay-Aux-Roses Cedex, France
| | - Edward M Campbell
- Graduate Program in Neuroscience, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA.,Core Imaging Facility and Department of Microbiology and Immunology, Loyola University of Chicago, Maywood, Illinois, USA
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17
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Signorelli P, Conte C, Albi E. The Multiple Roles of Sphingomyelin in Parkinson's Disease. Biomolecules 2021; 11:biom11091311. [PMID: 34572524 PMCID: PMC8469734 DOI: 10.3390/biom11091311] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 08/26/2021] [Accepted: 09/03/2021] [Indexed: 01/07/2023] Open
Abstract
Advances over the past decade have improved our understanding of the role of sphingolipid in the onset and progression of Parkinson's disease. Much attention has been paid to ceramide derived molecules, especially glucocerebroside, and little on sphingomyelin, a critical molecule for brain physiopathology. Sphingomyelin has been proposed to be involved in PD due to its presence in the myelin sheath and for its role in nerve impulse transmission, in presynaptic plasticity, and in neurotransmitter receptor localization. The analysis of sphingomyelin-metabolizing enzymes, the development of specific inhibitors, and advanced mass spectrometry have all provided insight into the signaling mechanisms of sphingomyelin and its implications in Parkinson's disease. This review describes in vitro and in vivo studies with often conflicting results. We focus on the synthesis and degradation enzymes of sphingomyelin, highlighting the genetic risks and the molecular alterations associated with Parkinson's disease.
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Affiliation(s)
- Paola Signorelli
- Biochemistry and Molecular Biology Laboratory, Health Sciences Department, University of Milan, 20142 Milan, Italy;
| | - Carmela Conte
- Department of Pharmaceutical Sciences, University of Perugia, 06126 Perugia, Italy;
| | - Elisabetta Albi
- Department of Pharmaceutical Sciences, University of Perugia, 06126 Perugia, Italy;
- Correspondence:
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18
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Sindhu S, Leung YH, Arefanian H, Madiraju SRM, Al‐Mulla F, Ahmad R, Prentki M. Neutral sphingomyelinase-2 and cardiometabolic diseases. Obes Rev 2021; 22:e13248. [PMID: 33738905 PMCID: PMC8365731 DOI: 10.1111/obr.13248] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/18/2021] [Accepted: 02/26/2021] [Indexed: 12/13/2022]
Abstract
Sphingolipids, in particular ceramides, play vital role in pathophysiological processes linked to metabolic syndrome, with implications in the development of insulin resistance, pancreatic ß-cell dysfunction, type 2 diabetes, atherosclerosis, inflammation, nonalcoholic steatohepatitis, and cancer. Ceramides are produced by the hydrolysis of sphingomyelin, catalyzed by different sphingomyelinases, including neutral sphingomyelinase 2 (nSMase2), whose dysregulation appears to underlie many of the inflammation-related pathologies. In this review, we discuss the current knowledge on the biochemistry of nSMase2 and ceramide production and its regulation by inflammatory cytokines, with particular reference to cardiometabolic diseases. nSMase2 contribution to pathogenic processes appears to involve cyclical feed-forward interaction with proinflammatory cytokines, such as TNF-α and IL-1ß, which activate nSMase2 and the production of ceramides, that in turn triggers the synthesis and release of inflammatory cytokines. We elaborate these pathogenic interactions at the molecular level and discuss the potential therapeutic benefits of inhibiting nSMase2 against inflammation-driven cardiometabolic diseases.
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Affiliation(s)
- Sardar Sindhu
- Animal and Imaging core facilityDasman Diabetes InstituteDasmanKuwait
| | - Yat Hei Leung
- Departments of Nutrition, Biochemistry and Molecular MedicineUniversity of MontrealMontréalQuebecCanada
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM)Montreal Diabetes Research CenterMontréalQuebecCanada
| | - Hossein Arefanian
- Immunology and Microbiology DepartmentDasman Diabetes InstituteDasmanKuwait
| | - S. R. Murthy Madiraju
- Departments of Nutrition, Biochemistry and Molecular MedicineUniversity of MontrealMontréalQuebecCanada
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM)Montreal Diabetes Research CenterMontréalQuebecCanada
| | - Fahd Al‐Mulla
- Department of Genetics and BioinformaticsDasman Diabetes InstituteDasmanKuwait
| | - Rasheed Ahmad
- Immunology and Microbiology DepartmentDasman Diabetes InstituteDasmanKuwait
| | - Marc Prentki
- Departments of Nutrition, Biochemistry and Molecular MedicineUniversity of MontrealMontréalQuebecCanada
- Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM)Montreal Diabetes Research CenterMontréalQuebecCanada
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19
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Xiang H, Jin S, Tan F, Xu Y, Lu Y, Wu T. Physiological functions and therapeutic applications of neutral sphingomyelinase and acid sphingomyelinase. Biomed Pharmacother 2021; 139:111610. [PMID: 33957567 DOI: 10.1016/j.biopha.2021.111610] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/05/2021] [Accepted: 04/12/2021] [Indexed: 11/15/2022] Open
Abstract
Sphingomyelin (SM) can be converted into ceramide (Cer) by neutral sphingomyelinase (NSM) and acid sphingomyelinase (ASM). Cer is a second messenger of lipids and can regulate cell growth and apoptosis. Increasing evidence shows that NSM and ASM play key roles in many processes, such as apoptosis, immune function and inflammation. Therefore, NSM and ASM have broad prospects in clinical treatments, especially in cancer, cardiovascular diseases (such as atherosclerosis), nervous system diseases (such as Alzheimer's disease), respiratory diseases (such as chronic obstructive pulmonary disease) and the phenotype of dwarfisms in adolescents, playing a complex regulatory role. This review focuses on the physiological functions of NSM and ASM and summarizes their roles in certain diseases and their potential applications in therapy.
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Affiliation(s)
- Hongjiao Xiang
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Shengjie Jin
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Fenglang Tan
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yifan Xu
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yifei Lu
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Tao Wu
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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20
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Dash RP, Thomas JA, Rosenfeld C, Srinivas NR. Protein Binding and Stability of Drug Candidates: The Achilles' Heel in In Vitro Potency Assays. Eur J Drug Metab Pharmacokinet 2021; 45:427-432. [PMID: 32270425 DOI: 10.1007/s13318-020-00619-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In the present scenario of drug discovery, several screening filters ensure a rigorous nomination of clinical candidates. One of these screens is the determination of IC50, the concentration of drug at half-maximal inhibitory concentration, also known as a potency assay. However, various nuances pertaining to the design, execution, and interpretation of in vitro potency results suggest a sizeable opportunity for the generation of erroneous data. The focus areas of this article include: (1) examining the requirement for the addition of serum albumin in in vitro potency assays, (2) problems encountered with cell lysates, and (3) drug candidate stability concerns during in vitro potency assays/high-throughput screening. Based on this assessment, the interpretation of the data generated using cell-based systems (i.e., lysates with or without the addition of fetal bovine serum) should be carried out with caution for in vitro potency testing, and the inclusion of a correction factor for non-specific protein binding should be considered. The addition of serum albumin to a cell-free system should be restricted to drugs having high protein binding (≥ 90%). Additionally, stability assessment of analytes should be considered to avoid dubious in vitro potency outcomes due to degraded material or active metabolite(s).
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Affiliation(s)
- Ranjeet P Dash
- ADME-DMPK, Charles River Laboratories, Ashland, OH, 44805, USA
| | | | | | - Nuggehally R Srinivas
- Department of Innovation and Technology, Jubilant Life Sciences, D-12 Sector 59a, Noida, Uttar Pradesh, 201301, India. .,Kenox Pharmaceuticals Inc., 11 Deerpark Dr, Suite 128, Princeton Corporate Plaza, Monmouth Junction, NJ, 08852, USA.
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21
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Gurunathan S, Kang MH, Jeyaraj M, Kim JH. Palladium Nanoparticle-Induced Oxidative Stress, Endoplasmic Reticulum Stress, Apoptosis, and Immunomodulation Enhance the Biogenesis and Release of Exosome in Human Leukemia Monocytic Cells (THP-1). Int J Nanomedicine 2021; 16:2849-2877. [PMID: 33883895 PMCID: PMC8055296 DOI: 10.2147/ijn.s305269] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 03/11/2021] [Indexed: 12/23/2022] Open
Abstract
Background Exosomes are endosome-derived nano-sized vesicles that have emerged as important mediators of intercellular communication and play significant roles in various diseases. However, their applications are rigorously restricted by the limited secretion competence of cells. Therefore, strategies to enhance the production and functions of exosomes are warranted. Studies have shown that nanomaterials can significantly enhance the effects of cells and exosomes in intercellular communication; however, how palladium nanoparticles (PdNPs) enhance exosome release in human leukemia monocytic cells (THP-1) remains unclear. Therefore, this study aimed to address the effect of PdNPs on exosome biogenesis and release in THP-1 cells. Methods Exosomes were isolated by ultracentrifugation and ExoQuickTM and characterized by dynamic light scattering, nanoparticle tracking analysis system, scanning electron microscopy, transmission electron microscopy, EXOCETTM assay, and fluorescence polarization. The expression levels of exosome markers were analyzed via quantitative reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay. Results PdNP treatment enhanced the biogenesis and release of exosomes by inducing oxidative stress, endoplasmic reticulum stress, apoptosis, and immunomodulation. The exosomes were spherical in shape and had an average diameter of 50–80 nm. Exosome production was confirmed via total protein concentration, exosome counts, acetylcholinesterase activity, and neutral sphingomyelinase activity. The expression levels of TSG101, CD9, CD63, and CD81 were significantly higher in PdNP-treated cells than in control cells. Further, cytokine and chemokine levels were significantly higher in exosomes isolated from PdNP-treated THP-1 cells than in those isolated from control cells. THP-1 cells pre-treated with N-acetylcysteine or GW4869 showed significant decreases in PdNP-induced exosome biogenesis and release. Conclusion To our knowledge, this is the first study showing that PdNPs stimulate exosome biogenesis and release and simultaneously increase the levels of cytokines and chemokines by modulating various physiological processes. Our findings suggest a reasonable approach to improve the production of exosomes for various therapeutic applications.
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Affiliation(s)
| | - Min-Hee Kang
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul, Korea
| | - Muniyandi Jeyaraj
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul, Korea
| | - Jin-Hoi Kim
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul, Korea
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22
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Lee TY, Lu WJ, Changou CA, Hsiung YC, Trang NTT, Lee CY, Chang TH, Jayakumar T, Hsieh CY, Yang CH, Chang CC, Chen RJ, Sheu JR, Lin KH. Platelet autophagic machinery involved in thrombosis through a novel linkage of AMPK-MTOR to sphingolipid metabolism. Autophagy 2021; 17:4141-4158. [PMID: 33749503 DOI: 10.1080/15548627.2021.1904495] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Basal macroautophagy/autophagy has recently been found in anucleate platelets. Platelet autophagy is involved in platelet activation and thrombus formation. However, the mechanism underlying autophagy in anucleate platelets require further clarification. Our data revealed that LC3-II formation and SQSTM1/p62 degradation were noted in H2O2-activated human platelets, which could be blocked by 3-methyladenine and bafilomycin A1, indicating that platelet activation may cause platelet autophagy. AMPK phosphorylation and MTOR dephosphorylation were also detected, and block of AMPK activity by the AMPK inhibitor dorsomorphin reversed SQSTM1 degradation and LC3-II formation. Moreover, autophagosome formation was observed through transmission electron microscopy and deconvolution microscopy. These findings suggest that platelet autophagy was induced partly through the AMPK-MTOR pathway. In addition, increased LC3-II expression occurred only in H2O2-treated Atg5f/f platelets, but not in H2O2-treated atg5-/- platelets, suggesting that platelet autophagy occurs during platelet activation. atg5-/- platelets also exhibited a lower aggregation in response to agonists, and platelet-specific atg5-/- mice exhibited delayed thrombus formation in mesenteric microvessles and decreased mortality rate due to pulmonary thrombosis. Notably, metabolic analysis revealed that sphingolipid metabolism is involved in platelet activation, as evidenced by observed several altered metabolites, which could be reversed by dorsomorphin. Therefore, platelet autophagy and platelet activation are positively correlated, partly through the interconnected network of sphingolipid metabolism. In conclusion, this study for the first time demonstrated that AMPK-MTOR signaling could regulate platelet autophagy. A novel linkage between AMPK-MTOR and sphingolipid metabolism in anucleate platelet autophagy was also identified: platelet autophagy and platelet activation are positively correlated.Abbreviations: 3-MA: 3-methyladenine; A.C.D.: citric acid/sod. citrate/glucose; ADP: adenosine diphosphate; AKT: AKT serine/threonine kinase; AMPK: AMP-activated protein kinase; ANOVA: analysis of variance; ATG: autophagy-related; B4GALT/LacCS: beta-1,4-galactosyltransferase; Baf-A1: bafilomycin A1; BECN1: beclin 1; BHT: butylate hydrooxytoluene; BSA: bovine serum albumin; DAG: diacylglycerol; ECL: enhanced chemiluminescence; EDTA: ethylenediamine tetraacetic acid; ELISA: enzyme-linked immunosorbent assay; GALC/GCDase: galactosylceramidase; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; GBA/GluSDase: glucosylceramidase beta; GPI: glycosylphosphatidylinositol; H2O2: hydrogen peroxide; HMDB: human metabolome database; HRP: horseradish peroxidase; IF: immunofluorescence; IgG: immunoglobulin G; KEGG: Kyoto Encyclopedia of Genes and Genomes; LAMP1: lysosomal associated membrane protein 1; LC-MS/MS: liquid chromatography-tandem mass spectrometry; mAb: monoclonal antibody; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MPV: mean platelet volume; MTOR: mechanistic target of rapamycin kinase; ox-LDL: oxidized low-density lipoprotein; pAb: polyclonal antibody; PC: phosphatidylcholine; PCR: polymerase chain reaction; PI3K: phosphoinositide 3-kinase; PLS-DA: partial least-squares discriminant analysis; PRP: platelet-rich plasma; Q-TOF: quadrupole-time of flight; RBC: red blood cell; ROS: reactive oxygen species; RPS6KB/p70S6K: ribosomal protein S6 kinase B; SDS: sodium dodecyl sulfate; S.E.M.: standard error of the mean; SEM: scanning electron microscopy; SGMS: sphingomyelin synthase; SM: sphingomyelin; SMPD/SMase: sphingomyelin phosphodiesterase; SQSTM1/p62: sequestosome 1; TEM: transmission electron microscopy; UGT8/CGT: UDP glycosyltransferase 8; UGCG/GCS: UDP-glucose ceramide glucosyltransferase; ULK1: unc-51 like autophagy activating kinase 1; UPLC: ultra-performance liquid chromatography; PIK3C3/VPS34: phosphatidylinositol 3-kinase catalytic subunit type 3; PtdIns3P: phosphatidylinositol-3-phosphate; WBC: white blood cell; WT: wild type.
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Affiliation(s)
- Tzu-Yin Lee
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Wan-Jung Lu
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Graduate Institute of Metabolism and Obesity Sciences, College of Nutrition, Taipei Medical University, Taipei, Taiwan.,Department of Medical Research, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chun A Changou
- Ph.D. Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan.,Integrated Laboratory, Center of Translational Medicine, Taipei Medical University, Taipei, Taiwan.,Core Facility, Taipei Medical University, Taipei, Taiwan
| | | | - Nguyen T T Trang
- International Ph.D. Program for Cell Therapy and Regeneration Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Cheng-Yang Lee
- Research Information Session, Office of Information Technology, Taipei Medical University, Taipei, Taiwan
| | - Tzu-Hao Chang
- Graduate Institute of Biomedical Informatics, Taipei Medical University, Taipei, Taiwan
| | - Thanasekaran Jayakumar
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Cheng-Ying Hsieh
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chih-Hao Yang
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chao-Chien Chang
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Cardiovascular Center, Cathay General Hospital, Taipei, Taiwan.,Division of Cardiology, Department of Internal Medicine, School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Ray-Jade Chen
- Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Division of General Surgery, Department of Surgery, Taipei Medical University Hospital, Taipei, Taiwan
| | - Joen-Rong Sheu
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Graduate Institute of Metabolism and Obesity Sciences, College of Nutrition, Taipei Medical University, Taipei, Taiwan
| | - Kuan-Hung Lin
- Department of Pharmacology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Institute of Biomedical Sciences, MacKay Medical College, New Taipei City, Taiwan
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23
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Zhang W, Wei Y, Zhang D, Xu EY. ZIAQ: a quantile regression method for differential expression analysis of single-cell RNA-seq data. Bioinformatics 2020; 36:3124-3130. [PMID: 32053182 DOI: 10.1093/bioinformatics/btaa098] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 01/11/2020] [Accepted: 02/06/2020] [Indexed: 02/07/2023] Open
Abstract
MOTIVATION Single-cell RNA sequencing (scRNA-seq) has enabled the simultaneous transcriptomic profiling of individual cells under different biological conditions. scRNA-seq data have two unique challenges that can affect the sensitivity and specificity of single-cell differential expression analysis: a large proportion of expressed genes with zero or low read counts ('dropout' events) and multimodal data distributions. RESULTS We have developed a zero-inflation-adjusted quantile (ZIAQ) algorithm, which is the first method to account for both dropout rates and complex scRNA-seq data distributions in the same model. ZIAQ demonstrates superior performance over several existing methods on simulated scRNA-seq datasets by finding more differentially expressed genes. When ZIAQ was applied to the comparison of neoplastic and non-neoplastic cells from a human glioblastoma dataset, the ranking of biologically relevant genes and pathways showed clear improvement over existing methods. AVAILABILITY AND IMPLEMENTATION ZIAQ is implemented in the R language and available at https://github.com/gefeizhang/ZIAQ. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Wenfei Zhang
- Department of Biostatistics and Programming, Sanofi, Framingham, MA 01701, USA
| | - Ying Wei
- Department of Biostatistics, Columbia University, New York, NY 10032, USA
| | - Donghui Zhang
- Department of Biostatistics and Programming, Sanofi, Framingham, MA 01701, USA
| | - Ethan Y Xu
- Translational Sciences, Sanofi, Framingham, MA 01701, USA
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24
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Al-Rashed F, Ahmad Z, Thomas R, Melhem M, Snider AJ, Obeid LM, Al-Mulla F, Hannun YA, Ahmad R. Neutral sphingomyelinase 2 regulates inflammatory responses in monocytes/macrophages induced by TNF-α. Sci Rep 2020; 10:16802. [PMID: 33033337 PMCID: PMC7544688 DOI: 10.1038/s41598-020-73912-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 09/17/2020] [Indexed: 12/11/2022] Open
Abstract
Obesity is associated with elevated levels of TNF-α and proinflammatory CD11c monocytes/macrophages. TNF-α mediated dysregulation in the plasticity of monocytes/macrophages is concomitant with pathogenesis of several inflammatory diseases, including metabolic syndrome, but the underlying mechanisms are incompletely understood. Since neutral sphingomyelinase-2 (nSMase2: SMPD3) is a key enzyme for ceramide production involved in inflammation, we investigated whether nSMase2 contributed to the inflammatory changes in the monocytes/macrophages induced by TNF-α. In this study, we demonstrate that the disruption of nSMase activity in monocytes/macrophages either by chemical inhibitor GW4869 or small interfering RNA (siRNA) against SMPD3 results in defects in the TNF-α mediated expression of CD11c. Furthermore, blockage of nSMase in monocytes/macrophages inhibited the secretion of inflammatory mediators IL-1β and MCP-1. In contrast, inhibition of acid SMase (aSMase) activity did not attenuate CD11c expression or secretion of IL-1β and MCP-1. TNF-α-induced phosphorylation of JNK, p38 and NF-κB was also attenuated by the inhibition of nSMase2. Moreover, NF-kB/AP-1 activity was blocked by the inhibition of nSMase2. SMPD3 was elevated in PBMCs from obese individuals and positively corelated with TNF-α gene expression. These findings indicate that nSMase2 acts, at least in part, as a master switch in the TNF-α mediated inflammatory responses in monocytes/macrophages.
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Affiliation(s)
- Fatema Al-Rashed
- Immunology and Microbiology Department, Dasman Diabetes Institute, Al-Soor Street, P.O. Box 1180, 15462, Dasman, Kuwait, Kuwait
| | - Zunair Ahmad
- School of Medicine, Royal College of Surgeons in Ireland - Medical University of Bahrain, Busaiteen, Bahrain
| | - Reeby Thomas
- Immunology and Microbiology Department, Dasman Diabetes Institute, Al-Soor Street, P.O. Box 1180, 15462, Dasman, Kuwait, Kuwait
| | - Motasem Melhem
- Genetics and Bioinformatics Department, Dasman Diabetes Institute, 15462, Dasman, Kuwait
| | - Ashley J Snider
- Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY, 11794, USA.,Department of Nutritional Sciences, College of Agriculture and Life Sciences, University of Arizona, Tucson, AZ, 85721, USA
| | - Lina M Obeid
- Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Fahd Al-Mulla
- Genetics and Bioinformatics Department, Dasman Diabetes Institute, 15462, Dasman, Kuwait
| | - Yusuf A Hannun
- Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Rasheed Ahmad
- Immunology and Microbiology Department, Dasman Diabetes Institute, Al-Soor Street, P.O. Box 1180, 15462, Dasman, Kuwait, Kuwait.
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25
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Emerging roles of ATG proteins and membrane lipids in autophagosome formation. Cell Discov 2020; 6:32. [PMID: 32509328 PMCID: PMC7248066 DOI: 10.1038/s41421-020-0161-3] [Citation(s) in RCA: 142] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 03/21/2020] [Indexed: 12/12/2022] Open
Abstract
Autophagosome biogenesis is a dynamic membrane event, which is executed by the sequential function of autophagy-related (ATG) proteins. Upon autophagy induction, a cup-shaped membrane structure appears in the cytoplasm, then elongates sequestering cytoplasmic materials, and finally forms a closed double membrane autophagosome. However, how this complex vesicle formation event is strictly controlled and achieved is still enigmatic. Recently, there is accumulating evidence showing that some ATG proteins have the ability to directly interact with membranes, transfer lipids between membranes and regulate lipid metabolism. A novel role for various membrane lipids in autophagosome formation is also emerging. Here, we highlight past and recent key findings on the function of ATG proteins related to autophagosome biogenesis and consider how ATG proteins control this dynamic membrane formation event to organize the autophagosome by collaborating with membrane lipids.
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26
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Iessi E, Marconi M, Manganelli V, Sorice M, Malorni W, Garofalo T, Matarrese P. On the role of sphingolipids in cell survival and death. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 351:149-195. [PMID: 32247579 DOI: 10.1016/bs.ircmb.2020.02.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Sphingolipids, universal components of biological membranes of all eukaryotic organisms, from yeasts to mammals, in addition of playing a structural role, also play an important part of signal transduction pathways. They participate or, also, ignite several fundamental subcellular signaling processes but, more in general, they directly contribute to key biological activities such as cell motility, growth, senescence, differentiation as well as cell fate, i.e., survival or death. The sphingolipid metabolic pathway displays an intricate network of reactions that result in the formation of multiple sphingolipids, including ceramide, and sphingosine-1-phosphate. Different sphingolipids, that have key roles in determining cell fate, can induce opposite effects: as a general rule, sphingosine-1-phosphate promotes cell survival and differentiation, whereas ceramide is known to induce apoptosis. Furthermore, together with cholesterol, sphingolipids also represent the basic lipid component of lipid rafts, cholesterol- and sphingolipid-enriched membrane microdomains directly involved in cell death and survival processes. In this review, we briefly describe the characteristics of sphingolipids and lipid membrane microdomains. In particular, we will consider the involvement of various sphingolipids per se and of lipid rafts in apoptotic pathway, both intrinsic and extrinsic, in nonapoptotic cell death, in autophagy, and in cell differentiation. In addition, their roles in the most common physiological and pathological contexts either as pathogenetic elements or as biomarkers of diseases will be considered. We would also hint how the manipulation of sphingolipid metabolism could represent a potential therapeutic target to be investigated and functionally validated especially for those diseases for which therapeutic options are limited or ineffective.
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Affiliation(s)
- Elisabetta Iessi
- Center for Gender-Specific Medicine, Oncology Unit, Istituto Superiore di Sanità, Rome, Italy
| | - Matteo Marconi
- Center for Gender-Specific Medicine, Oncology Unit, Istituto Superiore di Sanità, Rome, Italy
| | | | - Maurizio Sorice
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Walter Malorni
- Center for Gender-Specific Medicine, Oncology Unit, Istituto Superiore di Sanità, Rome, Italy; Department of Biology, University of Rome Tor Vergata, Rome, Italy.
| | - Tina Garofalo
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Paola Matarrese
- Center for Gender-Specific Medicine, Oncology Unit, Istituto Superiore di Sanità, Rome, Italy
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27
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Sphingomyelin phosphodiesterase 3 methylation and silencing in oral squamous cell carcinoma results in increased migration and invasion and altered stress response. Oncotarget 2020; 11:523-534. [PMID: 32082486 PMCID: PMC7007297 DOI: 10.18632/oncotarget.27458] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 01/13/2020] [Indexed: 12/30/2022] Open
Abstract
Neutral sphingomyelinase 2 (nSMase2), the product of the sphingomyelin phosphodiesterase 3 (SMPD3) gene, catalyzes the hydrolysis of sphingomyelin to ceramide. Ceramide acts on various signaling pathways to influence cell proliferation, survival, and stress response. Altered levels of sphingolipids and ceramides have been reported in various cancer types, including oral squamous cell carcinoma (OSCC). OSCC patients exhibit a poor 5-year survival rate of 50%, a figure that has remained stagnant for decades. To overcome this requires a better understanding of the molecular events driving this disease. The molecular analysis of the oral cavity reported here has identified the SMPD3 promoter region as a site of frequent hypermethylation and downregulation in pre-malignant and malignant tissues as compared with healthy control tissues. While lentivirus-induced overexpression of SMPD3 in cell models of oral dysplasia and OSCC did not significantly alter proliferation, it did decrease migration and invasion and increased resistance to the epidermal growth factor receptor (EGFR) inhibitor erlotinib. These results suggest that SMPD3 downregulation is a common event in OSCC progression and may promote the spread of tumor cells.
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28
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Hollmann C, Wiese T, Dennstädt F, Fink J, Schneider-Schaulies J, Beyersdorf N. Translational Approaches Targeting Ceramide Generation From Sphingomyelin in T Cells to Modulate Immunity in Humans. Front Immunol 2019; 10:2363. [PMID: 31681273 PMCID: PMC6798155 DOI: 10.3389/fimmu.2019.02363] [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: 05/31/2019] [Accepted: 09/19/2019] [Indexed: 12/12/2022] Open
Abstract
In T cells, as in all other cells of the body, sphingolipids form important structural components of membranes. Due to metabolic modifications, sphingolipids additionally play an active part in the signaling of cell surface receptors of T cells like the T cell receptor or the co-stimulatory molecule CD28. Moreover, the sphingolipid composition of their membranes crucially affects the integrity and function of subcellular compartments such as the lysosome. Previously, studying sphingolipid metabolism has been severely hampered by the limited number of analytical methods/model systems available. Besides well-established high resolution mass spectrometry new tools are now available like novel minimally modified sphingolipid subspecies for click chemistry as well as recently generated mouse mutants with deficiencies/overexpression of sphingolipid-modifying enzymes. Making use of these tools we and others discovered that the sphingolipid sphingomyelin is metabolized to ceramide to different degrees in distinct T cell subpopulations of mice and humans. This knowledge has already been translated into novel immunomodulatory approaches in mice and will in the future hopefully also be applicable to humans. In this paper we are, thus, summarizing the most recent findings on the impact of sphingolipid metabolism on T cell activation, differentiation, and effector functions. Moreover, we are discussing the therapeutic concepts arising from these insights and drugs or drug candidates which are already in clinical use or could be developed for clinical use in patients with diseases as distant as major depression and chronic viral infection.
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Affiliation(s)
- Claudia Hollmann
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Teresa Wiese
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Fabio Dennstädt
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Julian Fink
- Institute of Organic Chemistry, University of Würzburg, Würzburg, Germany
| | | | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
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29
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Sakamoto W, Canals D, Salamone S, Allopenna J, Clarke CJ, Snider J, Obeid LM, Hannun YA. Probing compartment-specific sphingolipids with targeted bacterial sphingomyelinases and ceramidases. J Lipid Res 2019; 60:1841-1850. [PMID: 31243119 DOI: 10.1194/jlr.m094722] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 06/11/2019] [Indexed: 12/20/2022] Open
Abstract
Sphingolipids contribute to the regulation of cell and tissue homeostasis, and disorders of sphingolipid metabolism lead to diseases such as inflammation, stroke, diabetes, and cancer. Sphingolipid metabolic pathways involve an array of enzymes that reside in specific subcellular organelles, resulting in the formation of many diverse sphingolipids with distinct molecular species based on the diversity of the ceramide (Cer) structure. In order to probe compartment-specific metabolism of sphingolipids in this study, we analyzed the Cer and SM species preferentially produced in the inner plasma membrane (PM), Golgi apparatus, ER, mitochondria, nucleus, and cytoplasm by using compartmentally targeted bacterial SMases and ceramidases. The results showed that the length of the acyl chain of Cer becomes longer according to the progress of Cer from synthesis in the ER to the Golgi apparatus, then to the PM. These findings suggest that each organelle shows different properties of SM-derived Cers consistent with its emerging distinct functions in vitro and in vivo.
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Affiliation(s)
- Wataru Sakamoto
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY.,Ono Pharmaceutical Company, Ltd. Oncology Research Laboratories, Osaka, Japan
| | - Daniel Canals
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY
| | - Silvia Salamone
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY
| | - Janet Allopenna
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY
| | - Christopher J Clarke
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY
| | - Justin Snider
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY
| | - Lina M Obeid
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY.,Northport Veterans Affairs Medical Center, Northport, NY
| | - Yusuf A Hannun
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY .,Departments of Biochemistry, Pharmacology, and Pathology, Stony Brook University, Stony Brook, NY
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30
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Wang LY, Fan RF, Yang DB, Zhang D, Wang L. Puerarin reverses cadmium-induced lysosomal dysfunction in primary rat proximal tubular cells via inhibiting Nrf2 pathway. Biochem Pharmacol 2019; 162:132-141. [DOI: 10.1016/j.bcp.2018.10.016] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 10/16/2018] [Indexed: 12/31/2022]
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31
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DPTIP, a newly identified potent brain penetrant neutral sphingomyelinase 2 inhibitor, regulates astrocyte-peripheral immune communication following brain inflammation. Sci Rep 2018; 8:17715. [PMID: 30531925 PMCID: PMC6286365 DOI: 10.1038/s41598-018-36144-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/08/2018] [Indexed: 01/05/2023] Open
Abstract
Brain injury and inflammation induces a local release of extracellular vesicles (EVs) from astrocytes carrying proteins, RNAs, and microRNAs into the circulation. When these vesicles reach the liver, they stimulate the secretion of cytokines that mobilize peripheral immune cell infiltration into the brain, which can cause secondary tissue damage and impair recovery. Recent studies suggest that suppression of EV biosynthesis through neutral sphingomyelinase 2 (nSMase2) inhibition may represent a new therapeutic strategy. Unfortunately, currently available nSMase2 inhibitors exhibit low potency (IC50 ≥ 1 μM), poor solubility and/or limited brain penetration. Through a high throughput screening campaign of >365,000 compounds against human nSMase2 we identified 2,6-Dimethoxy-4-(5-Phenyl-4-Thiophen-2-yl-1H-Imidazol-2-yl)-Phenol (DPTIP), a potent (IC50 30 nM), selective, metabolically stable, and brain penetrable (AUCbrain/AUCplasma = 0.26) nSMase2 inhibitor. DPTIP dose-dependently inhibited EV release in primary astrocyte cultures. In a mouse model of brain injury conducted in GFAP-GFP mice, DPTIP potently (10 mg/kg IP) inhibited IL-1β-induced astrocyte-derived EV release (51 ± 13%; p < 0.001). This inhibition led to a reduction of cytokine upregulation in liver and attenuation of the infiltration of immune cells into the brain (80 ± 23%; p < 0.01). A structurally similar but inactive analog had no effect in vitro or in vivo.
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