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Kalashnikova I, Patrikeeva S, Nanovskaya TN, Andreev YA, Ahmed MS, Rytting E. Folate-mediated Transport of Nanoparticles across the Placenta. Pharm Nanotechnol 2024; 12:171-183. [PMID: 37461351 DOI: 10.2174/2211738511666230717122429] [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: 04/07/2023] [Revised: 05/11/2023] [Accepted: 05/31/2023] [Indexed: 05/23/2024]
Abstract
BACKGROUND In this study, a prototype of a targeted nanocarrier for drug delivery for prenatal therapy of the developing fetus was developed and examined in vitro and ex vivo. The folate transport mechanism in the human placenta was utilized as a possible pathway for the transplacental delivery of targeted nanoparticles. METHODS Several types of folic acid-decorated polymeric nanoparticles were synthesized and characterized. During transport studies of targeted and non-targeted fluorescent nanoparticles across the placental barrier, the apparent permeability values, uptake, transfer indices, and distribution in placental tissue were determined. RESULTS The nanoparticles had no effect on BeWo b30 cell viability. In vitro, studies showed significantly higher apparent permeability of the targeted nanoparticles across the cell monolayers as compared to the nontargeted nanoparticles (Pe = 5.92 ± 1.44 ×10-6 cm/s for PLGA-PEG-FA vs. 1.26 ± 0.31 ×10-6 cm/s for PLGA-PEG, P < 0.05), and the transport of the targeted nanoparticles was significantly inhibited by excess folate. Ex vivo placental perfusion showed significantly greater accumulation of the targeted nanoparticles in the placental tissue (4.31 ± 0.91%/g for PLGA-PEG-FA vs. 2.07 ± 0.26%/g for PLGA-PEG). CONCLUSION The data obtained suggested different mechanisms for the uptake and transplacental transfer of targeted versus nontargeted nanoparticles. This targeted nanoformulation may be a promising strategy for fetal drug therapy.
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Affiliation(s)
- Irina Kalashnikova
- Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA
- Institute of Molecular Medicine, I.M. Sechenov First Moscow State Medical University, 119991 Moscow, Russia
| | - Svetlana Patrikeeva
- Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA
| | - Tatiana N Nanovskaya
- Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA
| | - Yaroslav A Andreev
- Institute of Molecular Medicine, I.M. Sechenov First Moscow State Medical University, 119991 Moscow, Russia
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Mahmoud S Ahmed
- Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA
| | - Erik Rytting
- Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA
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Petersen SH, Al Badawy K, Hopkins R, Vu DL, Rahmani M, Maia SM, Connolly JE. A novel GPI-anchored dominant-negative TGF-β receptor II renders T cells unresponsive to TGF-β signaling. Mol Ther Oncolytics 2023; 31:100730. [PMID: 37829123 PMCID: PMC10565558 DOI: 10.1016/j.omto.2023.100730] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 09/21/2023] [Indexed: 10/14/2023] Open
Abstract
Transforming growth factor β (TGF-β) is a pleiotropic cytokine expressed by a wide range of cell types and is known for hampering the effectiveness of cancer immune cell therapeutic approaches. We have designed a novel construct containing the extracellular domain of the TGF-β receptor II linked to a glycosylphosphatidylinositol (GPI) anchor (GPI-ecto-TβRII) lacking the transmembrane and cytoplasmic signaling domain of TGF-β receptor II (TβRII). T cells transduced with lentivirus expressing the GPI-ecto-TβRII construct show 5 to 15 times higher membrane expression compared with a previously established dominant-negative receptor carrying a truncated signaling domain. GPI-ecto-TβRII expression renders T cells unresponsive to TGF-β-induced signaling seen by a lack of SMAD phosphorylation upon exogeneous TGF-β treatment. Transduced T cells continue to express high levels of IFNγ and granulocyte-macrophage colony-stimulating factor (GM-CSF), among other cytokines, in the presence of TGF-β while cytokine expression in untransduced T cells is being markedly suppressed. Furthermore, T cells expressing GPI-ecto-TβRII constructs have been shown to efficiently capture and inactivate TGF-β from their environment. These results indicate the potential benefits of GPI-ecto-TβRII expressing cytotoxic T cells (CTLs) in future cell therapies.
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Affiliation(s)
| | | | | | - Dang L. Vu
- Tessa Therapeutics, Singapore, Singapore
- Program in Translational Immunology, Institute of Molecular and Cell Biology, A∗STAR, Singapore, Singapore
| | | | - Sonia M.P. Maia
- Tessa Therapeutics, Singapore, Singapore
- Program in Translational Immunology, Institute of Molecular and Cell Biology, A∗STAR, Singapore, Singapore
| | - John E. Connolly
- Tessa Therapeutics, Singapore, Singapore
- Program in Translational Immunology, Institute of Molecular and Cell Biology, A∗STAR, Singapore, Singapore
- Department of Microbiology and Immunity, National University of Singapore, Singapore, Singapore
- Institute of Biomedical Studies, Baylor University Medical Center, Waco, TX, USA
- Parker Institute for Cancer Immunotherapy, San Francisco, CA, USA
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3
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Gandidzanwa S, Beukes N, Joseph SV, Janse Van Vuuren A, Mashazi P, Britton J, Kilian G, Roux S, Nyokong T, Lee ME, Frost CL, Tshentu ZR. The development of folate-functionalised palladium nanoparticles for folate receptor targeting in breast cancer cells. NANOTECHNOLOGY 2023; 34:465705. [PMID: 37527629 DOI: 10.1088/1361-6528/acec52] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/01/2023] [Indexed: 08/03/2023]
Abstract
Folate receptor-targeted therapy has excellent prospects for the treatment of breast cancer. A non-toxic concentration of folate-conjugated palladium-based nanoparticles was used to target the overexpressed folate receptor on breast cancer cells. The folate-conjugated nanoparticles were tailored to accumulate selectively in cancer cells relative to normal cells via the folate receptor. The MDA-MB-231, MDA-MB-468, MCF-7 breast cancer cell lines, and MCF-10A normal cell lines were used in the study. Qualitative and quantitative analysis of nanoparticle cellular uptake and accumulation was conducted using transmission electron microscopy and inductively coupled plasma-optical emission spectroscopy. The findings proved that folate-conjugated palladium nanoparticles successfully and preferentially accumulated in breast cancer cells. We conclude that folate-conjugated palladium nanoparticles can be potentially used to target breast cancer cells for radiopharmaceutical applications.
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Affiliation(s)
| | - Natasha Beukes
- Department of Biochemistry and Microbiology, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Sinelizwi V Joseph
- Department of Chemistry, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Arno Janse Van Vuuren
- Center for High Resolution Transmission Electron Microscopy, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Philani Mashazi
- Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
- Institute of Nanotechnology Innovation, Rhodes University, Makhanda 6140, South Africa
| | - Jonathan Britton
- Institute of Nanotechnology Innovation, Rhodes University, Makhanda 6140, South Africa
| | - Gareth Kilian
- Department of Pharmacy, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Saartjie Roux
- Department of Human Physiology, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Tebello Nyokong
- Institute of Nanotechnology Innovation, Rhodes University, Makhanda 6140, South Africa
| | - Michael E Lee
- Center for High Resolution Transmission Electron Microscopy, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Carminita L Frost
- Department of Biochemistry and Microbiology, Nelson Mandela University, Gqeberha 6001, South Africa
| | - Zenixole R Tshentu
- Department of Chemistry, Nelson Mandela University, Gqeberha 6001, South Africa
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Chen LM, Chai KX. Exosome-Mediated Activation of the Prostasin-Matriptase Serine Protease Cascade in B Lymphoma Cells. Cancers (Basel) 2023; 15:3848. [PMID: 37568664 PMCID: PMC10417574 DOI: 10.3390/cancers15153848] [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: 06/25/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
Prostasin and matriptase are extracellular membrane serine proteases with opposing effects in solid epithelial tumors. Matriptase is an oncoprotein that promotes tumor initiation and progression, and prostasin is a tumor suppressor that reduces tumor invasion and metastasis. Previous studies have shown that a subgroup of Burkitt lymphoma have high levels of ectopic matriptase expression but no prostasin. Reducing the matriptase level via small interfering RNAs in B lymphoma cells impeded tumor xenograft growth in mice. Here, we report a novel approach to matriptase regulation in B cancer cells by prostasin via exosomes to initiate a prostasin-matriptase protease activation cascade. The activation and shedding of matriptase were monitored by measuring its quantity and trypsin-like serine protease activity in conditioned media. Sustained activation of the protease cascade in the cells was achieved by the stable expression of prostasin. The B cancer cells with prostasin expression presented phenotypes consistent with its tumor suppressor role, such as reduced growth and increased apoptosis. Prostasin exosomes could be developed as an agent to initiate the prostasin-matriptase cascade for treating B lymphoma with further studies in animal models.
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Affiliation(s)
- Li-Mei Chen
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32816, USA
| | - Karl X. Chai
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32816, USA
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Zuo N, Bai WZ, Wei WQ, Yuan TL, Zhang D, Wang YZ, Tang WH. Fungal CFEM effectors negatively regulate a maize wall-associated kinase by interacting with its alternatively spliced variant to dampen resistance. Cell Rep 2022; 41:111877. [PMID: 36577386 DOI: 10.1016/j.celrep.2022.111877] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 10/14/2022] [Accepted: 12/02/2022] [Indexed: 12/29/2022] Open
Abstract
The fungus Fusarium graminearum causes a devastating disease Gibberella stalk rot of maize. Our knowledge of molecular interactions between F. graminearum effectors and maize immunity factors is lacking. Here, we show that a group of cysteine-rich common in fungal extracellular membrane (CFEM) domain proteins of F. graminearum are required for full virulence in maize stalk infection and that they interact with two secreted maize proteins, ZmLRR5 and ZmWAK17ET. ZmWAK17ET is an alternative splicing isoform of a wall-associated kinase ZmWAK17. Both ZmLRR5 and ZmWAK17ET interact with the extracellular domain of ZmWAK17. Transgenic maize overexpressing ZmWAK17 shows increased resistance to F. graminearum, while ZmWAK17 mutants exhibit enhanced susceptibility to F. graminearum. Transient expression of ZmWAK17 in Nicotiana benthamiana triggers hypersensitive cell death, whereas co-expression of CFEMs with ZmWAK17ET or ZmLRR5 suppresses the ZmWAK17-triggered cell death. Our results show that ZmWAK17 mediates stalk rot resistance and that F. graminearum delivers apoplastic CFEMs to compromise ZmWAK17-mediated resistance.
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Affiliation(s)
- Ni Zuo
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei-Zhen Bai
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wan-Qian Wei
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ting-Lu Yuan
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dong Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yan-Zhang Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China.
| | - Wei-Hua Tang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Alvito P, Assunção RM, Bajard L, Martins C, Mengelers MJB, Mol H, Namorado S, van den Brand AD, Vasco E, Viegas S, Silva MJ. Current Advances, Research Needs and Gaps in Mycotoxins Biomonitoring under the HBM4EU-Lessons Learned and Future Trends. Toxins (Basel) 2022; 14:826. [PMID: 36548723 PMCID: PMC9783896 DOI: 10.3390/toxins14120826] [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: 09/30/2022] [Revised: 11/11/2022] [Accepted: 11/17/2022] [Indexed: 11/25/2022] Open
Abstract
Mycotoxins are natural metabolites produced by fungi that contaminate food and feed worldwide. They can pose a threat to human and animal health, mainly causing chronic effects, e.g., immunotoxic and carcinogenic. Due to climate change, an increase in European population exposure to mycotoxins is expected to occur, raising public health concerns. This urges us to assess the current human exposure to mycotoxins in Europe to allow monitoring exposure and prevent future health impacts. The mycotoxins deoxynivalenol (DON) and fumonisin B1 (FB1) were considered as priority substances to be studied within the European Human Biomonitoring Initiative (HBM4EU) to generate knowledge on internal exposure and their potential health impacts. Several policy questions were addressed concerning hazard characterization, exposure and risk assessment. The present article presents the current advances attained under the HBM4EU, research needs and gaps. Overall, the knowledge on the European population risk from exposure to DON was improved by using new harmonised data and a newly derived reference value. In addition, mechanistic information on FB1 was, for the first time, organized into an adverse outcome pathway for a congenital anomaly. It is expected that this knowledge will support policy making and contribute to driving new Human Biomonitoring (HBM) studies on mycotoxin exposure in Europe.
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Affiliation(s)
- Paula Alvito
- National Institute of Health Dr. Ricardo Jorge (INSA), 1649-016 Lisboa, Portugal
- Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Ricardo Manuel Assunção
- National Institute of Health Dr. Ricardo Jorge (INSA), 1649-016 Lisboa, Portugal
- Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
- IUEM, Instituto Universitário Egas Moniz, Egas Moniz-Cooperativa de Ensino Superior, CRL, Campus Universitário—Quinta da Granja, Monte da Caparica, 2829-511 Caparica, Portugal
| | - Lola Bajard
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, 611 37 Brno, Czech Republic
| | - Carla Martins
- National Institute of Health Dr. Ricardo Jorge (INSA), 1649-016 Lisboa, Portugal
- NOVA National School of Public Health, NOVA University of Lisbon, 1600-560 Lisbon, Portugal
- Comprehensive Health Research Center, CHRC, 1600-560 Lisbon, Portugal
| | - Marcel J. B. Mengelers
- National Institute for Public Health and the Environment (RIVM), 3720 BA Bilthoven, The Netherlands
| | - Hans Mol
- Wageningen Food Safety Research (WFSR), Part of Wageningen University & Research, 6708 WB Wageningen, The Netherlands
| | - Sónia Namorado
- National Institute of Health Dr. Ricardo Jorge (INSA), 1649-016 Lisboa, Portugal
- Comprehensive Health Research Center, CHRC, 1600-560 Lisbon, Portugal
| | - Annick D. van den Brand
- National Institute for Public Health and the Environment (RIVM), 3720 BA Bilthoven, The Netherlands
| | - Elsa Vasco
- National Institute of Health Dr. Ricardo Jorge (INSA), 1649-016 Lisboa, Portugal
| | - Susana Viegas
- NOVA National School of Public Health, NOVA University of Lisbon, 1600-560 Lisbon, Portugal
- Comprehensive Health Research Center, CHRC, 1600-560 Lisbon, Portugal
| | - Maria João Silva
- National Institute of Health Dr. Ricardo Jorge (INSA), 1649-016 Lisboa, Portugal
- ToxOmics—NOVA Medical School, NOVA University of Lisbon, 1150-082 Lisboa, Portugal
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Providing Biological Plausibility for Exposure–Health Relationships for the Mycotoxins Deoxynivalenol (DON) and Fumonisin B1 (FB1) in Humans Using the AOP Framework. Toxins (Basel) 2022; 14:toxins14040279. [PMID: 35448888 PMCID: PMC9030459 DOI: 10.3390/toxins14040279] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/04/2022] [Accepted: 04/10/2022] [Indexed: 02/07/2023] Open
Abstract
Humans are chronically exposed to the mycotoxins deoxynivalenol (DON) and fumonisin B1 (FB1), as indicated by their widespread presence in foods and occasional exposure in the workplace. This exposure is confirmed by human biomonitoring (HBM) studies on (metabolites of) these mycotoxins in human matrices. We evaluated the exposure–health relationship of the mycotoxins in humans by reviewing the available literature. Since human studies did not allow the identification of unequivocal chronic health effects upon exposure to DON and FB1, the adverse outcome pathway (AOP) framework was used to structure additional mechanistic evidence from in vitro and animal studies on the identified adverse effects. In addition to a preliminary AOP for DON resulting in the adverse outcome (AO) ‘reduced body weight gain’, we developed a more elaborated AOP for FB1, from the molecular initiating event (MIE) ‘inhibition of ceramide synthases’ leading to the AO ‘neural tube defects’. The mechanistic evidence from AOPs can be used to support the limited evidence from human studies, to focus FB1- and DON-related research in humans to identify related early biomarkers of effect. In order to establish additional human exposure–health relationships in the future, recommendations are given to maximize the information that can be obtained from HBM.
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Prostasin regulates PD-L1 expression in human lung cancer cells. Biosci Rep 2021; 41:229226. [PMID: 34240739 PMCID: PMC8273379 DOI: 10.1042/bsr20211370] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 06/18/2021] [Accepted: 06/25/2021] [Indexed: 11/17/2022] Open
Abstract
The serine protease prostasin is a negative regulator of lipopolysaccharide-induced inflammation and has a role in the regulation of cellular immunity. Prostasin expression in cancer cells inhibits migration and metastasis, and reduces epithelial–mesenchymal transition. Programmed death-ligand 1 (PD-L1) is a negative regulator of the immune response and its expression in cancer cells interferes with immune surveillance. The aim of the present study was to investigate if prostasin regulates PD-L1 expression. We established sublines overexpressing various forms of prostasin as well as a subline deficient for the prostasin gene from the Calu-3 human lung cancer cells. We report here that PD-L1 expression induced by interferon-γ (IFNγ) is further enhanced in cells overexpressing the wildtype membrane-anchored prostasin. The PD-L1 protein was localized on the cell surface and released into the culture medium in extracellular vesicles (EVs) with the protease-active prostasin. The epidermal growth factor-epidermal growth factor receptor (EGF-EGFR), protein kinase C (PKC), and mitogen-activated protein kinase (MAPK) participated in the prostasin-mediated up-regulation of PD-L1 expression. A Gene Set Enrichment Analysis (GSEA) of patient lung tumors in The Cancer Genome Atlas (TCGA) database revealed that prostasin and PD-L1 regulate common signaling pathways during tumorigenesis and tumor progression.
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Zhou Y, Gorfe AA, Hancock JF. RAS Nanoclusters Selectively Sort Distinct Lipid Headgroups and Acyl Chains. Front Mol Biosci 2021; 8:686338. [PMID: 34222339 PMCID: PMC8245699 DOI: 10.3389/fmolb.2021.686338] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 05/13/2021] [Indexed: 12/12/2022] Open
Abstract
RAS proteins are lipid-anchored small GTPases that switch between the GTP-bound active and GDP-bound inactive states. RAS isoforms, including HRAS, NRAS and splice variants KRAS4A and KRAS4B, are some of the most frequently mutated proteins in cancer. In particular, constitutively active mutants of KRAS comprise ∼80% of all RAS oncogenic mutations and are found in 98% of pancreatic, 45% of colorectal and 31% of lung tumors. Plasma membrane (PM) is the primary location of RAS signaling in biology and pathology. Thus, a better understanding of how RAS proteins localize to and distribute on the PM is critical to better comprehend RAS biology and to develop new strategies to treat RAS pathology. In this review, we discuss recent findings on how RAS proteins sort lipids as they undergo macromolecular assembly on the PM. We also discuss how RAS/lipid nanoclusters serve as signaling platforms for the efficient recruitment of effectors and signal transduction, and how perturbing the PM biophysical properties affect the spatial distribution of RAS isoforms and their functions.
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Affiliation(s)
- Yong Zhou
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center, Houston, TX, United States
| | - Alemayehu A. Gorfe
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center, Houston, TX, United States
| | - John F. Hancock
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center, Houston, TX, United States
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Vidal M. Exosomes and GPI-anchored proteins: Judicious pairs for investigating biomarkers from body fluids. Adv Drug Deliv Rev 2020; 161-162:110-123. [PMID: 32828789 DOI: 10.1016/j.addr.2020.08.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/27/2020] [Accepted: 08/14/2020] [Indexed: 12/16/2022]
Abstract
Exosomes are 50-100 nm membranous vesicles actively released by cells which can be indicative of a diseased cell status. They contain various kinds of molecule - proteins, mRNA, miRNA, lipids - that are actively being studied as potential biomarkers. Hereafter I put forward several arguments in favor of the potential use of glycosylphosphatidylinositol-anchored proteins (GPI-APs) as biomarkers especially of cancerous diseases. I will briefly update readers on the exosome field and review various features of GPI-APs, before further discussing the advantages of this class of proteins as potential exosomal biomarkers. I will finish with a few examples of exosomal GPI-APs that have already been demonstrated to be good prognostic markers, as well as innovative approaches developed to quantify these exosomal biomarkers.
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11
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Folate Receptor β (FRβ) Expression in Tissue-Resident and Tumor-Associated Macrophages Associates with and Depends on the Expression of PU.1. Cells 2020; 9:cells9061445. [PMID: 32532019 PMCID: PMC7349916 DOI: 10.3390/cells9061445] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/02/2020] [Accepted: 06/08/2020] [Indexed: 02/07/2023] Open
Abstract
As macrophages exhibit a huge functional plasticity under homeostasis and pathological conditions, they have become a therapeutic target for chronic inflammatory diseases. Hence, the identification of macrophage subset-specific markers is a requisite for the development of macrophage-directed therapeutic interventions. In this regard, the macrophage-specific Folate Receptor β (FRβ, encoded by the FOLR2 gene) has been already validated as a target for molecular delivery in cancer as well as in macrophage-targeting therapeutic strategies for chronic inflammatory pathologies. We now show that the transcriptome of human macrophages from healthy and inflamed tissues (tumor; rheumatoid arthritis, RA) share a significant over-representation of the “anti-inflammatory gene set”, which defines the gene profile of M-CSF-dependent IL-10-producing human macrophages (M-MØ). More specifically, FOLR2 expression has been found to strongly correlate with the expression of M-MØ-specific genes in tissue-resident macrophages, tumor-associated macrophages (TAM) and macrophages from inflamed synovium, and also correlates with the presence of the PU.1 transcription factor. In fact, PU.1-binding elements are found upstream of the first exon of FOLR2 and most M-MØ-specific- and TAM-specific genes. The functional relevance of PU.1 binding was demonstrated through analysis of the proximal regulatory region of the FOLR2 gene, whose activity was dependent on a cluster of PU.1-binding sequences. Further, siRNA-mediated knockdown established the importance of PU.1 for FOLR2 gene expression in myeloid cells. Therefore, we provide evidence that FRβ marks tissue-resident macrophages as well as macrophages within inflamed tissues, and its expression is dependent on PU.1.
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Zhang R, Qin X, Kong F, Chen P, Pan G. Improving cellular uptake of therapeutic entities through interaction with components of cell membrane. Drug Deliv 2019; 26:328-342. [PMID: 30905189 PMCID: PMC6442206 DOI: 10.1080/10717544.2019.1582730] [Citation(s) in RCA: 165] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 02/08/2019] [Accepted: 02/11/2019] [Indexed: 12/24/2022] Open
Abstract
Efficient cellular delivery of biologically active molecules is one of the key factors that affect the discovery and development of novel drugs. The plasma membrane is the first barrier that prevents direct translocation of chemic entities, and thus obstructs their efficient intracellular delivery. Generally, hydrophilic small molecule drugs are poor permeability that reduce bioavailability and thus limit the clinic application. The cellular uptake of macromolecules and drug carriers is very inefficient without external assistance. Therefore, it is desirable to develop potent delivery systems for achieving effective intracellular delivery of chemic entities. Apart from of the types of delivery strategies, the composition of the cell membrane is critical for delivery efficiency due to the fact that cellular uptake is affected by the interaction between the chemical entity and the plasma membrane. In this review, we aimed to develop a profound understanding of the interactions between delivery systems and components of the plasma membrane. For the purpose, we attempt to present a broad overview of what delivery systems can be used to enhance the intracellular delivery of poorly permeable chemic entities, and how various delivery strategies are applied according to the components of plasma membrane.
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Affiliation(s)
- Renshuai Zhang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, P.R. China
| | - Xiaofei Qin
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, P.R. China
| | - Fandong Kong
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agriculture Sciences, Haikou, P.R. China
| | - Pengwei Chen
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agriculture Sciences, Haikou, P.R. China
| | - Guojun Pan
- School of Life Sciences, Taishan Medical University, Tai’an, P.R. China
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Abstract
The development of multiple cell culture models of prion infection over the last two decades has led to a significant increase in our understanding of how prions infect cells. In particular, new techniques to distinguish exogenous from endogenous prions have allowed us for the first time to look in depth at the earliest stages of prion infection through to the establishment of persistent infection. These studies have shown that prions can infect multiple cell types, both neuronal and nonneuronal. Once in contact with the cell, they are rapidly taken up via multiple endocytic pathways. After uptake, the initial replication of prions occurs almost immediately on the plasma membrane and within multiple endocytic compartments. Following this acute stage of prion replication, persistent prion infection may or may not be established. Establishment of a persistent prion infection in cells appears to depend upon the achievement of a delicate balance between the rate of prion replication and degradation, the rate of cell division, and the efficiency of prion spread from cell to cell. Overall, cell culture models have shown that prion infection of the cell is a complex and variable process which can involve multiple cellular pathways and compartments even within a single cell.
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Affiliation(s)
- Suzette A Priola
- Laboratory of Persistent Viral Diseases, National Institute of Allergy and Infectious Diseases, Hamilton, MT, United States.
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Kinoshita M, Suzuki KG, Murata M, Matsumori N. Evidence of lipid rafts based on the partition and dynamic behavior of sphingomyelins. Chem Phys Lipids 2018; 215:84-95. [DOI: 10.1016/j.chemphyslip.2018.07.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/13/2018] [Accepted: 07/10/2018] [Indexed: 01/10/2023]
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15
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Possible Role of Phosphatidylcholine and Sphingomyelin on Fumonisin B1-mediated Toxicity. Food Saf (Tokyo) 2017; 5:75-97. [PMID: 32231933 DOI: 10.14252/foodsafetyfscj.2017004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/29/2017] [Indexed: 12/21/2022] Open
Abstract
A major corn-related mycotoxin, fumonisin B1 (FB1), continues to attract attention of researchers as well as risk-assessors due to the diverse toxicological characteristics, including distinct target tissues in different animal species and opposite susceptibility in males and females in mice and rats. More than thirty years passed since the structure identification as a sphingoid-like chemical, but the causal mechanism of the toxicity remains obscure in spites of extensive studies. Considerable amounts of knowledge have been accumulated on the biochemical/toxicological actions of FB1, but the influence on lipid dynamics and mobilization in the body has not been focused well in relation to the FB1-mediated toxicity. Considerable influences of this toxin on mobilization of sphingolipids and phospholipids and also on adaptive changes in their compositions in tissues are implicated from recent studies on FB1-interacting ceramide synthases. Accumulated patho-physiological data also suggest a possible role of hepatic phospholipid on FB1-mediated toxicity. Thus, a mechanism of FB1-mediated toxicity is discussed in relation to the mobilization of phospholipids and sphingolipids in the body in this context.
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17
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Truong A, Yip C, Paye A, Blacher S, Munaut C, Deroanne C, Noel A, Sounni NE. Dynamics of internalization and recycling of the prometastatic membrane type 4 matrix metalloproteinase (MT4-MMP) in breast cancer cells. FEBS J 2016; 283:704-22. [DOI: 10.1111/febs.13625] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 12/03/2015] [Accepted: 12/10/2015] [Indexed: 02/06/2023]
Affiliation(s)
- Alice Truong
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
| | - Cassandre Yip
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
| | - Alexandra Paye
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
| | - Silvia Blacher
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
| | - Carine Munaut
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
| | - Christophe Deroanne
- Laboratory of Connective Tissues Biology; GIGA-Cancer; University of Liège; Belgium
| | - Agnès Noel
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
| | - Nor Eddine Sounni
- Laboratory of Tumor and Development Biology; Groupe Interdisciplinaire de Génoprotéomique Appliquée-Cancer (GIGA-Cancer); University of Liège; Belgium
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18
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Kettle E, Page SL, Morgan GP, Malladi CS, Wong CL, Boadle RA, Marsh BJ, Robinson PJ, Chircop M. A Cholesterol-Dependent Endocytic Mechanism Generates Midbody Tubules During Cytokinesis. Traffic 2015; 16:1174-92. [DOI: 10.1111/tra.12328] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 08/24/2015] [Accepted: 08/24/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Emma Kettle
- Children's Medical Research Institute; The University of Sydney; 214 Hawkesbury Road Westmead NSW 2145 Australia
| | - Scott L. Page
- Children's Medical Research Institute; The University of Sydney; 214 Hawkesbury Road Westmead NSW 2145 Australia
| | - Garry P. Morgan
- Institute for Molecular Biosciences, Queensland Bioscience Precinct; The University of Queensland; Brisbane Queensland 4072 Australia
| | - Chandra S. Malladi
- Department of Molecular Physiology, School of Medicine; University of Western Sydney; Penrith NSW 2751 Australia
| | - Chin L. Wong
- Children's Medical Research Institute; The University of Sydney; 214 Hawkesbury Road Westmead NSW 2145 Australia
| | - Ross A. Boadle
- Westmead Millennium Institute for Medical Research; 176 Hawkesbury Road Westmead NSW 2145 Australia
| | - Brad J. Marsh
- Institute for Molecular Biosciences, Queensland Bioscience Precinct; The University of Queensland; Brisbane Queensland 4072 Australia
| | - Phillip J. Robinson
- Children's Medical Research Institute; The University of Sydney; 214 Hawkesbury Road Westmead NSW 2145 Australia
| | - Megan Chircop
- Children's Medical Research Institute; The University of Sydney; 214 Hawkesbury Road Westmead NSW 2145 Australia
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Jaensch N, Corrêa IR, Watanabe R. Stable cell surface expression of GPI-anchored proteins, but not intracellular transport, depends on their fatty acid structure. Traffic 2014; 15:1305-29. [PMID: 25196094 DOI: 10.1111/tra.12224] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 09/02/2014] [Accepted: 09/02/2014] [Indexed: 11/28/2022]
Abstract
Glycosylphosphatidylinositol-anchored proteins (GPI-APs) are a class of lipid anchored proteins expressed on the cell surface of eukaryotes. The potential interaction of GPI-APs with ordered lipid domains enriched in cholesterol and sphingolipids has been proposed to function in the intracellular transport of these lipid anchored proteins. Here, we examined the biological importance of two saturated fatty acids present in the phosphatidylinositol moiety of GPI-APs. These fatty acids are introduced by the action of lipid remodeling enzymes and required for the GPI-AP association within ordered lipid domains. We found that the fatty acid remodeling is not required for either efficient Golgi-to-plasma membrane transport or selective endocytosis via GPI-enriched early endosomal compartment (GEEC)/ clathrin-independent carrier (CLIC) pathway, whereas cholesterol depletion significantly affects both pathways independent of their fatty acid structure. Therefore, the mechanism of cholesterol dependence does not appear to be related to the interaction with ordered lipid domains mediated by two saturated fatty acids. Furthermore, cholesterol extraction drastically releases the unremodeled GPI-APs carrying an unsaturated fatty acid from the cell surface, but not remodeled GPI-APs carrying two saturated fatty acids. This underscores the essential role of lipid remodeling to ensure a stable membrane association of GPI-APs particularly under potential membrane lipid perturbation.
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Affiliation(s)
- Nina Jaensch
- Department of Biochemistry, University of Geneva Sciences II, CH1-1211 Geneva, Switzerland
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Abstract
Folic acid, also known as vitamin B9 (Fig. 9.1), is an essential co-enzyme in one-carbon metabolism pathways, including the biosynthesis of nucleotides (i.e. purines, thymidine) and several amino acids. In general, two functionally different systems mediate the cellular uptake of folate: (1) the reduced folate carrier (RFC, Kd ∼ 10-6 M), an anion transporter that delivers folates across the plasma membrane in a bidirectional fashion, and (2) the folate receptor (FR, Kd ∼ 10-10 M), which internalizes folate through active receptor-mediated endocytosis. The RFC, a membrane-spanning anion transporter, is present in virtually all tissues and is responsible for the majority of folate transport in and out of cells. In contrast, FR expression is largely restricted to malignant cells, activated macrophages, and the proximal tubule cells of the kidneys. Because a variety of important diseases are caused by the former two cell types, interest in exploiting FR for drug targeting applications has rapidly increased. And achievement of this targeting objective, primarily through conjugation of drugs to folic acid is believed to enable (1) enhanced net drug uptake by pathologic cells, and more importantly (2) reduction in drug deposition into non-pathologic cells, thereby mitigating collateral toxicity to normal tissues.
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Pevna M, Doubek M, Coupek P, Stehlikova O, Klabusay M. Residual cancer lymphocytes in patients with chronic lymphocytic leukemia after therapy show increased expression of surface antigen CD52 detected using quantitative fluorescence cytometry. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2014; 14:411-8. [PMID: 25066039 DOI: 10.1016/j.clml.2014.06.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 05/09/2014] [Accepted: 06/04/2014] [Indexed: 12/21/2022]
Abstract
BACKGROUND Rituximab and alemtuzumab, mAbs used in recent years to treat CLL, are directed against antigens CD20 and CD52. CD20 is not highly expressed by CLL tumor cells, and rituximab does not have significant effectiveness in CLL unless combined with chemotherapy. Alemtuzumab targets CD52, which is much more highly expressed, and is currently the most effective agent used alone for CLL. Variability in expression of both antigens among these patients might be related to different individual therapeutic responses to mAb therapy. PATIENTS AND METHODS A total 95 patients diagnosed with CLL and/or SLL were divided into 4 groups: (1) untreated; (2) in complete or partial remission; (3) disease in progression; and (4) diagnosed with SLL. Flow cytometry of peripheral blood cells included gating of the CD5(+)CD19(+) tumor population, within which mean fluorescence intensity of fluorescein isothiocyanate (FITC) conjugated with anti-CD20 or anti-CD52 antibody was measured. The resulting expression of the 2 antigens was deduced from the calibration curve using Quantum FITC particles. RESULTS Expression of CD20 showed no significant differences among the 4 groups of patients. However, significantly greater expression of surface antigen CD52 was recorded in patient group 2 in complete or partial remission (P < .001). CONCLUSION The residual population of CLL cells after therapy is characterized by increased surface detection of CD52. Although the exact cause of this phenomenon is unknown, our results provide a basis to consider the potential for CLL consolidation therapy using alemtuzumab.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Alemtuzumab
- Antibodies, Monoclonal, Humanized/therapeutic use
- Antigens, CD/blood
- Antigens, Neoplasm/blood
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- CD52 Antigen
- Calibration
- Female
- Flow Cytometry/methods
- Fluorescein-5-isothiocyanate/analysis
- Fluorescent Dyes/analysis
- Fluorometry/methods
- Glycoproteins/blood
- Humans
- Leukemia, Lymphocytic, Chronic, B-Cell/blood
- Leukemia, Lymphocytic, Chronic, B-Cell/drug therapy
- Lymphocytes/chemistry
- Male
- Middle Aged
- Molecular Targeted Therapy
- Neoplasm, Residual
- Patient Selection
- Remission Induction
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Affiliation(s)
- Michaela Pevna
- International Clinical Research Center-Integrated Center of Cellular Therapy and Regenerative Medicine, St Anne's University Hospital Brno, Brno, Czech Republic
| | - Michael Doubek
- Department of Internal Medicine-Hematooncology, University Hospital Brno, Brno, Czech Republic
| | - Petr Coupek
- International Clinical Research Center-Integrated Center of Cellular Therapy and Regenerative Medicine, St Anne's University Hospital Brno, Brno, Czech Republic
| | - Olga Stehlikova
- Department of Internal Medicine-Hematooncology, University Hospital Brno, Brno, Czech Republic
| | - Martin Klabusay
- International Clinical Research Center-Integrated Center of Cellular Therapy and Regenerative Medicine, St Anne's University Hospital Brno, Brno, Czech Republic.
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Hullin-Matsuda F, Taguchi T, Greimel P, Kobayashi T. Lipid compartmentalization in the endosome system. Semin Cell Dev Biol 2014; 31:48-56. [DOI: 10.1016/j.semcdb.2014.04.010] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 04/01/2014] [Accepted: 04/03/2014] [Indexed: 11/15/2022]
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Abstract
GLUT4 is regulated by its intracellular localization. In the absence of insulin, GLUT4 is efficiently retained intracellularly within storage compartments in muscle and fat cells. Upon insulin stimulation (and contraction in muscle), GLUT4 translocates from these compartments to the cell surface where it transports glucose from the extracellular milieu into the cell. Its implication in insulin-regulated glucose uptake makes GLUT4 not only a key player in normal glucose homeostasis but also an important element in insulin resistance and type 2 diabetes. Nevertheless, how GLUT4 is retained intracellularly and how insulin acts on this retention mechanism is largely unclear. In this review, the current knowledge regarding the various molecular processes that govern GLUT4 physiology is discussed as well as the questions that remain.
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24
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Siljamäki E, Rintanen N, Kirsi M, Upla P, Wang W, Karjalainen M, Ikonen E, Marjomäki V. Cholesterol dependence of collagen and echovirus 1 trafficking along the novel α2β1 integrin internalization pathway. PLoS One 2013; 8:e55465. [PMID: 23393580 PMCID: PMC3564754 DOI: 10.1371/journal.pone.0055465] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 12/23/2012] [Indexed: 12/29/2022] Open
Abstract
We have previously shown that soluble collagen and a human pathogen, echovirus 1 (EV1) cluster α2β1 integrin on the plasma membrane and cause their internalization into cytoplasmic endosomes. Here we show that cholesterol plays a major role not only in the uptake of α2β1 integrin and its ligands but also in the formation of α2 integrin-specific multivesicular bodies (α2-MVBs) and virus infection. EV1 infection and α2β1 integrin internalization were totally halted by low amounts of the cholesterol-aggregating drugs filipin or nystatin. Inhibition of cholesterol synthesis and accumulation of lanosterol after ketoconazole treatment inhibited uptake of collagen, virus and clustered integrin, and prevented formation of multivesicular bodies and virus infection. Loading of lipid starved cells with cholesterol increased infection to some extent but could not completely restore EV1 infection to control levels. Cold Triton X-100 treatment did not solubilize the α2-MVBs suggesting, together with cholesterol labeling, that the cytoplasmic endosomes were enriched in detergent-resistant lipids in contrast to αV integrin labeled control endosomes in the clathrin pathway. Cholesterol aggregation leading to increased ion permeability caused a significant reduction in EV1 uncoating in endosomes as judged by sucrose gradient centrifugation and by neutral red-based uncoating assay. In contrast, the replication step was not dependent on cholesterol in contrast to the reports on several other viruses. In conclusion, our results showed that the integrin internalization pathway is dependent on cholesterol for uptake of collagen, EV1 and integrin, for maturation of endosomal structures and for promoting EV1 uncoating. The results thus provide novel information for developing anti-viral strategies and more insight into collagen and integrin trafficking.
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Affiliation(s)
- Elina Siljamäki
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Nina Rintanen
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Maija Kirsi
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Paula Upla
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Wei Wang
- Institute of Biomedicine, University of Helsinki, Helsinki, Finland
- Minerva Foundation Institute for Medical Research, Helsinki, Finland
| | - Mikko Karjalainen
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Elina Ikonen
- Institute of Biomedicine, University of Helsinki, Helsinki, Finland
- Minerva Foundation Institute for Medical Research, Helsinki, Finland
| | - Varpu Marjomäki
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
- * E-mail:
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Vijayaraghavalu S, Peetla C, Lu S, Labhasetwar V. Epigenetic modulation of the biophysical properties of drug-resistant cell lipids to restore drug transport and endocytic functions. Mol Pharm 2012; 9:2730-42. [PMID: 22817326 DOI: 10.1021/mp300281t] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In our recent studies exploring the biophysical characteristics of resistant cell lipids, and the role they play in drug transport, we demonstrated the difference of drug-resistant breast cancer cells from drug-sensitive cells in lipid composition and biophysical properties, suggesting that cancer cells acquire a drug-resistant phenotype through the alteration of lipid synthesis to inhibit intracellular drug transport to protect from cytotoxic effect. In cancer cells, epigenetic changes (e.g., DNA hypermethylation) are essential to maintain this drug-resistant phenotype. Thus, altered lipid synthesis may be linked to epigenetic mechanisms of drug resistance. We hypothesize that reversing DNA hypermethylation in resistant cells with an epigenetic drug could alter lipid synthesis, changing the cell membrane's biophysical properties to facilitate drug delivery to overcome drug resistance. Herein we show that treating drug-resistant breast cancer cells (MCF-7/ADR) with the epigenetic drug 5-aza-2'-deoxycytidine (decitabine) significantly alters cell lipid composition and biophysical properties, causing the resistant cells to acquire biophysical characteristics similar to those of sensitive cell (MCF-7) lipids. Following decitabine treatment, resistant cells demonstrated increased sphingomyelinase activity, resulting in a decreased sphingomyelin level that influenced lipid domain structures, increased membrane fluidity, and reduced P-glycoprotein expression. Changes in the biophysical characteristics of resistant cell lipids facilitated doxorubicin transport and restored endocytic function for drug delivery with a lipid-encapsulated form of doxorubicin, enhancing the drug efficacy. In conclusion, we have established a new mechanism for efficacy of an epigenetic drug, mediated through changes in lipid composition and biophysical properties, in reversing cancer drug resistance.
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Affiliation(s)
- Sivakumar Vijayaraghavalu
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland, Ohio 44195, United States
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Fujita M, Kinoshita T. GPI-anchor remodeling: Potential functions of GPI-anchors in intracellular trafficking and membrane dynamics. Biochim Biophys Acta Mol Cell Biol Lipids 2012; 1821:1050-8. [DOI: 10.1016/j.bbalip.2012.01.004] [Citation(s) in RCA: 164] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Revised: 12/28/2011] [Accepted: 01/04/2012] [Indexed: 01/08/2023]
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Guimarães de Araújo ME, Huber LA, Stasyk T. Latex beads internalization and quantitative proteomics join forces to decipher the endosomal proteome. Expert Rev Proteomics 2011; 8:303-7. [PMID: 21679111 DOI: 10.1586/epr.11.27] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The proteome analysis of endocytic compartments has been constrained by the limited purity of the organelle fractions obtained by current biochemical methods. Duclos and coworkers have developed a novel method to isolate highly purified endosomal organelles based on small latex beads internalization followed by gradient centrifugation and successfully combined it with a redundant peptide counting method to compare the relative abundance of proteins in organelles. The presence of bona fide markers in their respective subcellular organelles and the identification of several new endosomal-associated proteins, attested the applicability of their combinatory approach. Future applications of this strategy may deliver a comprehensive endosomal proteome chart: from the identification of the key players to the determination of time and signaling-dependent proteome changes. As a long-term perspective, such an approach may unveil new clues to the molecular mechanisms underlining human diseases associated with endosomal biogenesis defects.
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Refaei M, Leventis R, Silvius JR. Assessment of the roles of ordered lipid microdomains in post-endocytic trafficking of glycosyl-phosphatidylinositol-anchored proteins in mammalian fibroblasts. Traffic 2011; 12:1012-24. [PMID: 21696526 DOI: 10.1111/j.1600-0854.2011.01206.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have used artificial phosphatidylethanolamine-polyethylene glycol (PE-PEG)-anchored proteins, incorporated into living mammalian cells, to evaluate previously proposed roles for ordered lipid 'raft' domains in the post-endocytic trafficking of glycosylphosphatidylinositol (GPI)-anchored proteins in CHO and BHK cells. In CHO cells, endocytosed PE-PEG protein conjugates colocalized strongly with the internalized GPI-anchored folate receptor, concentrating in the endosomal recycling compartment, regardless of the structure of the hydrocarbon chains of the PE-PEG 'anchor'. However, internalized PE-PEG protein conjugates with long-chain saturated anchors recycled to the plasma membrane at a slow rate comparable to that measured for the GPI-anchored folate receptor, whereas conjugates with short-chain or unsaturated anchors recycled at a faster rate similar to that observed for the transferrin receptor. These findings support the proposal (Mayor et al. Cholesterol-dependent retention of GPI-anchored proteins in endosomes. EMBO J 1998;17:4628-4638) that the slow recycling of GPI proteins in CHO cells rests on their affinity for ordered lipid domains. In BHK cells, internalized PE-PEG protein conjugates with either saturated or unsaturated 'anchors' colocalized strongly with simultaneously endocytosed folate receptor and, like the folate receptor, gradually accumulated in late endosomes/lysosomes. These latter findings do not support previous suggestions that the sorting of GPI proteins to late endosomes in BHK cells depends on their association with lipid rafts.
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Affiliation(s)
- Mohammad Refaei
- Department of Biochemistry, McGill University, Montréal, Québec, Canada
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29
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Structural remodeling, trafficking and functions of glycosylphosphatidylinositol-anchored proteins. Prog Lipid Res 2011; 50:411-24. [PMID: 21658410 DOI: 10.1016/j.plipres.2011.05.002] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Glycosylphosphatidylinositol (GPI) is a glycolipid that is covalently attached to proteins as a post-translational modification. Such modification leads to the anchoring of the protein to the outer leaflet of the plasma membrane. Proteins that are decorated with GPIs have unique properties in terms of their physical nature. In particular, these proteins tend to accumulate in lipid rafts, which are critical for the functions and trafficking of GPI-anchored proteins (GPI-APs). Recent studies mainly using mutant cells revealed that various structural remodeling reactions occur to GPIs present in GPI-APs as they are transported from the endoplasmic reticulum to the cell surface. This review examines the recent progress describing the mechanisms of structural remodeling of mammalian GPI-anchors, such as inositol deacylation, glycan remodeling and fatty acid remodeling, with particular focus on their trafficking and functions, as well as the pathogenesis involving GPI-APs and their deficiency.
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Molecules, mechanisms, and cellular roles of clathrin-independent endocytosis. Curr Opin Cell Biol 2010; 22:519-27. [DOI: 10.1016/j.ceb.2010.04.001] [Citation(s) in RCA: 158] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 03/30/2010] [Accepted: 04/01/2010] [Indexed: 01/31/2023]
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Vidal M. Exosomes in erythropoiesis. Transfus Clin Biol 2010; 17:131-7. [PMID: 20655786 DOI: 10.1016/j.tracli.2010.05.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Accepted: 05/24/2010] [Indexed: 01/21/2023]
Abstract
Multivesicular endosomes contain membrane vesicles which can be released into the extracellular environment as exosomes. This review describes the role of exosome secretion in the remodeling of the red cell plasma membrane during the last stage of erythropoietic differentiation. Herein, we propose that the exosome biogenesis involves several mechanisms of protein sorting and leads to partial or complete loss of membrane activities, in some cases in a regulated way.
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Affiliation(s)
- M Vidal
- UMR 5235 CNRS (DIMNP), université Montpellier II - cc 107, place E.-Bataillon, 34095 Montpellier cedex 05, France.
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32
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Bate C, Tayebi M, Williams A. Glycosylphosphatidylinositol anchor analogues sequester cholesterol and reduce prion formation. J Biol Chem 2010; 285:22017-26. [PMID: 20427265 DOI: 10.1074/jbc.m110.108548] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A hallmark of prion diseases is the conversion of the host-encoded prion protein (PrP(C) where C is cellular) into an alternatively folded, disease-related isoform (PrP(Sc), where Sc is scrapie), the accumulation of which is associated with synapse degeneration and ultimately neuronal death. The formation of PrP(Sc) is dependent upon the presence of PrP(C) in specific, cholesterol-sensitive membrane microdomains, commonly called lipid rafts. PrP(C) is targeted to these lipid rafts because it is attached to membranes via a glycosylphosphatidylinositol anchor. Here, we show that treatment of prion-infected neuronal cell lines (ScN2a, ScGT1, or SMB cells) with synthetic glycosylphosphatidylinositol analogues, glucosamine-phosphatidylinositol (glucosamine-PI) or glucosamine 2-O-methyl inositol octadecyl phosphate, reduced the PrP(Sc) content of these cells in a dose-dependent manner. In addition, ScGT1 cells treated with glucosamine-PI did not transmit infection following intracerebral injection to mice. Treatment with glucosamine-PI increased the cholesterol content of ScGT1 cell membranes and reduced activation of cytoplasmic phospholipase A(2) (PLA(2)), consistent with the hypothesis that the composition of cell membranes affects key PLA(2)-dependent signaling pathways involved in PrP(Sc) formation. The effect of glucosamine-PI on PrP(Sc) formation was also reversed by the addition of platelet-activating factor. Glucosamine-PI caused the displacement of PrP(C) from lipid rafts and reduced expression of PrP(C) at the cell surface, putative sites for PrP(Sc) formation. We propose that treatment with glucosamine-PI modifies local micro-environments that control PrP(C) expression and activation of PLA(2) and subsequently inhibits PrP(Sc) formation.
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Affiliation(s)
- Clive Bate
- Department of Pathology and Infectious Diseases, Royal Veterinary College, Hawkshead Lane, North Mymms, Herts AL9 7TA, United Kingdom.
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Lakhan SE, Sabharanjak S, De A. Endocytosis of glycosylphosphatidylinositol-anchored proteins. J Biomed Sci 2009; 16:93. [PMID: 19832981 PMCID: PMC2764642 DOI: 10.1186/1423-0127-16-93] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2009] [Accepted: 10/15/2009] [Indexed: 12/12/2022] Open
Abstract
Glycosylphosphatidylinositol-anchored proteins (GPI-APs) represent an interesting amalgamation of the three basic kinds of cellular macromolecules viz. proteins, carbohydrates and lipids. An unusually hybrid moiety, the GPI-anchor is expressed in a diverse range of organisms from parasites to mammalian cells and serves to anchor a large number of functionally diverse proteins and has been the center of attention in scientific debate for some time now. Membrane organization of GPI-APs into laterally-organized cholesterol-sphingolipid ordered membrane domains or "rafts" and endocytosis of GPI-APs has been intensely debated. Inclusion into or exclusion from these membrane domains seems to be the critical factor in determining the endocytic mechanisms and intracellular destinations of GPI-APs. The intracellular signaling as well as endocytic trafficking of GPI-APs is critically dependent upon the cell surface organization of GPI-APs, and the associations with these lipid rafts play a vital role during these processes. The mechanism of endocytosis for GPI-APs may differ from other cellular endocytic pathways, such as those mediated by clathrin-coated pits (caveolae), and is necessary for unique biological functions. Numerous intracellular factors are involved in and regulate the endocytosis of GPI-APs, and these may be variably dependent on cell-type. The central focus of this article is to describe the significance of the endocytosis of GPI-APs on a multitude of biological processes, ranging from nutrient-uptake to more complex immune responses. Ultimately, a thorough elucidation of GPI-AP mediated signaling pathways and their regulatory elements will enhance our understanding of essential biological processes and benefit as components of disease intervention strategies.
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Affiliation(s)
- Shaheen E Lakhan
- Global Neuroscience Initiative Foundation, Los Angeles, CA, USA.
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Chaudhry A, Verghese DA, Das SR, Jameel S, George A, Bal V, Mayor S, Rath S. HIV-1 Nef promotes endocytosis of cell surface MHC class II molecules via a constitutive pathway. THE JOURNAL OF IMMUNOLOGY 2009; 183:2415-24. [PMID: 19620308 DOI: 10.4049/jimmunol.0804014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
HIV-1 Nef has been reported to disrupt MHC class II (MHCII)-mediated Ag presentation by a dual strategy that comprises a reduction in cell surface levels of peptide-loaded mature MHCII molecules and a up-regulation of immature MHCII molecules. We show that Nef achieves relocation of MHCII away from the cell surface in monocytic cells by both delaying its transport to the cell surface and by accelerating endocytic removal of cell surface MHCII to a lysosomal compartment. Nef-induced MHCII endocytosis is cholesterol-sensitive but clathrin- and dynamin-independent. Internalized MHCII molecules traverse the early endosomal system and colocalize with pinocytic cargo before reaching lysosomes. Nef-triggered MHCII endocytosis requires Rab5 activity and lyst function, whereas lysosomal trafficking of internalized MHCII molecules requires Rab7 activity. We further show that a similar pathway can remove peptide-MHCII complexes from the surface of monocytic cells not expressing Nef. Our data suggest that Nef uses mechanisms involved in normal MHCII recycling and turnover to mediate the delivery of cell surface MHCII to a lysosomal destination. Thus, Nef-mediated endocytosis of MHCII provides a novel perspective on the regulation of normal MHCII trafficking.
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Marijanovic Z, Caputo A, Campana V, Zurzolo C. Identification of an intracellular site of prion conversion. PLoS Pathog 2009; 5:e1000426. [PMID: 19424437 PMCID: PMC2673690 DOI: 10.1371/journal.ppat.1000426] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Accepted: 04/13/2009] [Indexed: 01/01/2023] Open
Abstract
Prion diseases are fatal, neurodegenerative disorders in humans and animals and are characterized by the accumulation of an abnormally folded isoform of the cellular prion protein (PrPC), denoted PrPSc, which represents the major component of infectious scrapie prions. Characterization of the mechanism of conversion of PrPC into PrPSc and identification of the intracellular site where it occurs are among the most important questions in prion biology. Despite numerous efforts, both of these questions remain unsolved. We have quantitatively analyzed the distribution of PrPC and PrPSc and measured PrPSc levels in different infected neuronal cell lines in which protein trafficking has been selectively impaired. Our data exclude roles for both early and late endosomes and identify the endosomal recycling compartment as the likely site of prion conversion. These findings represent a fundamental step towards understanding the cellular mechanism of prion conversion and will allow the development of new therapeutic approaches for prion diseases. The misfolded form (PrPSc or prion) of the naturally occuring prion protein (PrPC or cellular PrP) is responsible for neurodegenerative diseases such as Creutzfeldt-Jakob disease (CJD), bovine spongiform encephalopathy (BSE) (also known as ‘mad cow disease’) and a new variant of CJD (vCJD), which is thought to be caused by ingestion of cattle-derived foodstuffs contaminated with prions. These diseases are characterized by the accumulation of protein deposits in the central nervous system (CNS). However, unlike other neurodegenerative diseases, prion diseases are infectious and prions are able to propagate in a chain reaction by imposing their malconformed state onto the properly folded cellular proteins. Understanding where the conversion of PrPC into PrPSc occurs in cells has been an unsolved question until now. By analysing the intracellular localization of PrPC and PrPSc and measuring the levels of PrPSc produced in infected neuronal cell lines under conditions in which intracellular trafficking of the protein is impaired, we found that prion conversion occurs in the endosomal recycling compartment (ERC) where it transits after being internalized from the cell surface. This study will help to clarify the cellular mechanism of the disease and it opens the way to new therapeutic strategies aimed at the conversion compartment.
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Affiliation(s)
- Zrinka Marijanovic
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris, France
| | - Anna Caputo
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris, France
- Dipartimento di Biologia e Patologia Cellulare e Molecolare, Università degli Studi di Napoli ‘Federico II’, Naples, Italy
| | - Vincenza Campana
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris, France
| | - Chiara Zurzolo
- Institut Pasteur, Unité Trafic Membranaire et Pathogénèse, Paris, France
- Dipartimento di Biologia e Patologia Cellulare e Molecolare, Università degli Studi di Napoli ‘Federico II’, Naples, Italy
- * E-mail: or
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Folate-targeted therapeutic and imaging agents for cancer. Curr Opin Chem Biol 2009; 13:256-62. [PMID: 19419901 DOI: 10.1016/j.cbpa.2009.03.022] [Citation(s) in RCA: 445] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Accepted: 03/30/2009] [Indexed: 11/21/2022]
Abstract
Cancer therapies that exploit targeting ligands to deliver attached cytotoxic drugs selectively to malignant cells are currently receiving significant attention. While antibody-targeted drugs have been the first to enter the clinic, recent studies demonstrate that the vitamin folic acid can also be used to deliver attached imaging and therapeutic agents selectively to malignant cells in both animal tumor models and human cancer patients. Thus, folate conjugates bind to folate receptors that are overexpressed on approximately 40% of human cancers and mediate internalization of their attached drugs by receptor-mediated endocytosis. With the use of proper linkers, folate-targeted drugs can be released inside their target cells where they can perform their desired cytotoxic functions. Based on this strategy, six folate-targeted drugs are currently in human clinical trials.
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Myelin, DIGs, and membrane rafts in the central nervous system. Prostaglandins Other Lipid Mediat 2009; 91:118-29. [PMID: 19379822 DOI: 10.1016/j.prostaglandins.2009.04.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 04/08/2009] [Accepted: 04/09/2009] [Indexed: 11/21/2022]
Abstract
Over the past 40 years our understanding of the organization of cell membranes has changed dramatically. Membranes are no longer viewed as a homogenous sea of phospholipids studded with randomly positioned islands of proteins. Our current view of the membrane involves the formation of small lipid clusters, comprised mainly of cholesterol and sphingolipids, known as membrane rafts. These lipid clusters apparently include and exclude specific proteins leading to the hypothesis that these domains (1) regulate cellular polarity and compartmentalization through trafficking and sorting, (2) provide platforms for cellular signaling and adhesion, and (3) function as cellular gate keepers. Tremendous controversy surrounds the concept of membrane rafts primarily because these small, highly dynamic entities are too small to be observed with traditional microscopic methods and the most utilized approach for raft analysis relies on poorly quantified, inconsistent biochemical extractions. New analytical approaches are being developed and applied to the study of membrane rafts and these techniques provide great promise for furthering our understanding of these enigmatic domains. In this review we will provide a brief summary of the current understanding of membrane rafts, utilizing the CNS myelin literature for illustrative purposes, and present caveats that should be considered when studying these domains.
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Regulation of group I metabotropic glutamate receptor trafficking and signaling by the caveolar/lipid raft pathway. J Neurosci 2009; 29:3590-602. [PMID: 19295163 DOI: 10.1523/jneurosci.5824-08.2009] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Endocytic trafficking of neurotransmitter receptors is critical to neuronal signaling and activity-dependent synaptic plasticity. Although the importance of clathrin-mediated endocytosis in receptor trafficking in neurons is well established, the contribution of the caveolar/lipid raft pathway has been little explored. Here, we show that caveolin-1, an adaptor protein that associates with lipid rafts and the main coat protein of caveolae, binds to and colocalizes with metabotropic glutamate receptors 1/5 (mGluR1/5). The interaction with caveolin-1 controls the rate of constitutive mGluR1 internalization, thereby regulating expression of the receptor at the cell surface. Consistent with a role for caveolin-1 in mGluR trafficking, we show that mGluR1/5 associate with lipid rafts in the brain and that their constitutive internalization is mediated, in both heterologous cells and neurons, by caveolar/raft-dependent endocytosis. We further show that caveolin-1 attenuates mGluR1-dependent activation of extracellular signal-regulated kinase (ERK)-mitogen-activated protein kinase (MAPK) signaling, an effect that is abolished in cells expressing mutant mGluR1 lacking intact caveolin binding motifs. Neurons from caveolin-1 knock-out mice show enhanced basal ERK1/2 phosphorylation and prolonged ERK1/2 activation in response to stimulation with DHPG [(RS)-3,5-dihydroxyphenylglycine], a group I mGluR-selective agonist. Together, these findings underscore the importance of caveolar rafts in neurons and suggest that this pathway might play an important role in synapse formation and plasticity.
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Baba A, Akagi K, Takayanagi M, Flanagan JG, Kobayashi T, Hattori M. Fyn tyrosine kinase regulates the surface expression of glycosylphosphatidylinositol-linked ephrin via the modulation of sphingomyelin metabolism. J Biol Chem 2009; 284:9206-14. [PMID: 19181669 DOI: 10.1074/jbc.m809401200] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Glycosylphosphatidylinositol-linked ephrin-As play important roles in various biological events, such as neuronal development and immune responses. Because the surface amount of ephrin-As is critical in these events, the trafficking of ephrin-As must be regulated by intracellular machinery. In particular, Src family protein-tyrosine kinases regulate the intracellular trafficking of several membrane molecules and act downstream of ephrin-As; whether they affect the trafficking of ephrin-As, however, has remained unexplored. Here, we report that the activity of Src family protein-tyrosine kinases, particularly Fyn, negatively regulates the cell-surface amount of ephrin-As. The expression of constitutively active Fyn decreases the surface amount of ephrin-As. Conversely, the expression of dominant-negative Fyn or the application of a Src-family inhibitor increases the surface amount of ephrin-A2. The total cellular amount of ephrin-A is inversely correlated with its amount on the surface, suggesting that ephrin-As are more stable in the intracellular compartment. The expression of constitutively active Fyn increases the amount of sphingomyelin clusters on the plasma membrane, whereas inhibiting Fyn decreases it. Moreover, the inhibition of sphingomyelin synthesis greatly increases the surface amount of ephrin-As. Altogether, these results suggest that Fyn regulates the surface amount of ephrin-As by modulating the metabolism of sphingomyelin, which presumably inhibits the trafficking of ephrin-As from endosomes to the plasma membrane. The signaling cascade described here may function as part of the negative feedback loop of ephrin-A function.
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Affiliation(s)
- Atsushi Baba
- Department of Biomedical Science, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan.
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Gelineau-van Waes J, Voss KA, Stevens VL, Speer MC, Riley RT. Maternal fumonisin exposure as a risk factor for neural tube defects. ADVANCES IN FOOD AND NUTRITION RESEARCH 2009; 56:145-181. [PMID: 19389609 DOI: 10.1016/s1043-4526(08)00605-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Fumonisins are mycotoxins produced by the fungus F. verticillioides, a common contaminant of maize (corn) worldwide. Maternal consumption of fumonisin B(1)-contaminated maize during early pregnancy has recently been associated with increased risk for neural tube defects (NTDs) in human populations that rely heavily on maize as a dietary staple. Experimental administration of purified fumonisin to mice early in gestation also results in an increased incidence of NTDs in exposed offspring. Fumonisin inhibits the enzyme ceramide synthase in de novo sphingolipid biosynthesis, resulting in an elevation of free sphingoid bases and depletion of downstream glycosphingolipids. Increased sphingoid base metabolites (i.e., sphinganine-1-phosphate) may perturb signaling cascades involved in embryonic morphogenesis by functioning as ligands for sphingosine-1-P (S1P) receptors, a family of G-protein-coupled receptors that regulate key biological processes such as cell survival/proliferation, differentiation and migration. Fumonisin-induced depletion of glycosphingolipids impairs expression and function of the GPI-anchored folate receptor (Folr1), which may also contribute to adverse pregnancy outcomes. NTDs appear to be multifactorial in origin, involving complex gene-nutrient-environment interactions. Vitamin supplements containing folic acid have been shown to reduce the occurrence of NTDs, and may help protect the developing fetus from environmental teratogens. Fumonisins appear to be an environmental risk factor for birth defects, although other aspects of maternal nutrition and genetics play interactive roles in determining pregnancy outcome. Minimizing exposures to mycotoxins through enhanced agricultural practices, identifying biomarkers of exposure, characterizing mechanisms of toxicity, and improving maternal nutrition are all important strategies for reducing the NTD burden in susceptible human populations.
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Affiliation(s)
- J Gelineau-van Waes
- Department of Genetics, Cell Biology & Anatomy, University of Nebraska Medical Center, Omaha, Nebraska, USA
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Goswami D, Gowrishankar K, Bilgrami S, Ghosh S, Raghupathy R, Chadda R, Vishwakarma R, Rao M, Mayor S. Nanoclusters of GPI-anchored proteins are formed by cortical actin-driven activity. Cell 2008; 135:1085-97. [PMID: 19070578 DOI: 10.1016/j.cell.2008.11.032] [Citation(s) in RCA: 354] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2008] [Revised: 09/16/2008] [Accepted: 11/24/2008] [Indexed: 10/21/2022]
Abstract
Several cell-surface lipid-tethered proteins exhibit a concentration-independent, cholesterol-sensitive organization of nanoscale clusters and monomers. To understand the mechanism of formation of these clusters, we investigate the spatial distribution and steady-state dynamics of fluorescently tagged GPI-anchored protein nanoclusters using high-spatial and temporal resolution FRET microscopy. These studies reveal a nonrandom spatial distribution of nanoclusters, concentrated in optically resolvable domains. Monitoring the dynamics of recovery of fluorescence intensity and anisotropy, we find that nanoclusters are immobile, and the dynamics of interconversion between nanoclusters and monomers, over a range of temperatures, is spatially heterogeneous and non-Arrhenius, with a sharp crossover coinciding with a reduction in the activity of cortical actin. Cholesterol depletion perturbs cortical actin and the spatial scale and interconversion dynamics of nanoclusters. Direct perturbations of cortical actin activity also affect the construction, dynamics, and spatial organization of nanoclusters. These results suggest a unique mechanism of complexation of cell-surface molecules regulated by cortical actin activity.
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Affiliation(s)
- Debanjan Goswami
- National Centre for Biological Sciences (TIFR), Bellary Road, Bangalore 560065, India
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42
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Müller G, Jung C, Straub J, Wied S, Kramer W. Induced release of membrane vesicles from rat adipocytes containing glycosylphosphatidylinositol-anchored microdomain and lipid droplet signalling proteins. Cell Signal 2008; 21:324-38. [PMID: 19010410 DOI: 10.1016/j.cellsig.2008.10.021] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Revised: 10/24/2008] [Accepted: 10/28/2008] [Indexed: 01/14/2023]
Abstract
Synthesis and degradation of lipids in mammalian adipocytes are tightly and coordinatedly regulated by insulin, fatty acids, reactive oxygen species and drugs. Conversely, the lipogenic or lipolytic state of adipocytes is communicated to other tissues by the secretion of soluble adipocytokines. Here we report that insulin, palmitate, H(2)O(2) and the antidiabetic sulfonylurea drug glimepiride induce the release of the typical lipid droplet (LD) protein, perilipin-A, as well as typical plasma membrane microdomain (DIGs) proteins, such as caveolin-1 and the glycosylphosphatidylinositol (GPI)-anchored proteins, Gce1 and CD73 from rat adipocytes. According to biochemical and morphological criteria these LD and GPI-proteins are embedded within two different types of phospholipid-containing membrane vesicles, collectively called adiposomes. Adiposome release was not found to be causally related to cell lysis or apoptosis. The interaction of Gce1 and CD73 with the adiposomes apparently depends on their intact GPI anchor. Pull-down of caveolin-1, perilipin-A and CD73 together with phospholipids (via binding to annexin-V) as well as mutually of caveolin-1 with CD73 or perilipin-A (via coimmunoprecipitation) argues for their colocalization within the same adiposome vesicle. Taken together, certain lipogenic and anti-lipolytic agents induce the specific release of a subset of LD and DIGs proteins, including certain GPI-proteins, in adiposomes from primary rat adipocytes. Given the (c)AMP-degrading activities of Gce1 and CD73 and LD-forming function of perilipin-A and caveolin-1, the physiological relevance of the release of adiposomes from adipocytes may rely on the intercellular transfer of lipogenic and anti-lipolytic information.
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Affiliation(s)
- Günter Müller
- Sanofi-Aventis Pharma, R & D, Therapeutic Department Metabolism, Industrial Park Höchst, Bldg. H821, 65926 Frankfurt am Main, Germany.
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43
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Chaudhry A, Das SR, Jameel S, George A, Bal V, Mayor S, Rath S. HIV-1 Nef Induces a Rab11-Dependent Routing of Endocytosed Immune Costimulatory Proteins CD80 and CD86 to the Golgi. Traffic 2008; 9:1925-35. [DOI: 10.1111/j.1600-0854.2008.00802.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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Distinct Lipid Rafts in Subdomains from Human Placental Apical Syncytiotrophoblast Membranes. J Membr Biol 2008; 224:21-31. [DOI: 10.1007/s00232-008-9125-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Accepted: 08/19/2008] [Indexed: 12/13/2022]
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45
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Sesana S, Re F, Bulbarelli A, Salerno D, Cazzaniga E, Masserini M. Membrane Features and Activity of GPI-Anchored Enzymes: Alkaline Phosphatase Reconstituted in Model Membranes. Biochemistry 2008; 47:5433-40. [DOI: 10.1021/bi800005s] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Silvia Sesana
- Department of Experimental Medicine, University of Milano-Bicocca, Monza, Italy
| | - Francesca Re
- Department of Experimental Medicine, University of Milano-Bicocca, Monza, Italy
| | | | - Domenico Salerno
- Department of Experimental Medicine, University of Milano-Bicocca, Monza, Italy
| | - Emanuela Cazzaniga
- Department of Experimental Medicine, University of Milano-Bicocca, Monza, Italy
| | - Massimo Masserini
- Department of Experimental Medicine, University of Milano-Bicocca, Monza, Italy
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Lakkaraju A, Rodriguez-Boulan E. Itinerant exosomes: emerging roles in cell and tissue polarity. Trends Cell Biol 2008; 18:199-209. [PMID: 18396047 DOI: 10.1016/j.tcb.2008.03.002] [Citation(s) in RCA: 265] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2008] [Revised: 03/05/2008] [Accepted: 03/06/2008] [Indexed: 12/11/2022]
Abstract
Cells use secreted signals (e.g. chemokines and growth factors) and sophisticated vehicles such as argosomes, cytonemes, tunneling nanotubes and exosomes to relay important information to other cells, often over large distances. Exosomes, 30-100-nm intraluminal vesicles of multivesicular bodies (MVB) released upon exocytic fusion of the MVB with the plasma membrane, are increasingly recognized as a novel mode of cell-independent communication. Exosomes have been shown to function in antigen presentation and tumor metastasis, and in transmitting infectious agents. However, little is known about the biogenesis and function of exosomes in polarized cells. In this review, we discuss new evidence suggesting that exosomes participate in the transport of morphogens and RNA, and thus influence cell polarity and developmental patterning of tissues.
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Affiliation(s)
- Aparna Lakkaraju
- Margaret M. Dyson Vision Research Institute, Department of Ophthalmology, Weill Medical College of Cornell University, New York, NY 10021, USA.
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Fujita M, Jigami Y. Lipid remodeling of GPI-anchored proteins and its function. Biochim Biophys Acta Gen Subj 2008; 1780:410-20. [PMID: 17913366 DOI: 10.1016/j.bbagen.2007.08.009] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 08/10/2007] [Accepted: 08/14/2007] [Indexed: 02/07/2023]
Abstract
Many proteins are attached to the cell surface via a conserved post-translational modification, the glycosylphosphatidylinositol (GPI) anchor. GPI-anchored proteins are functionally diverse, but one of their most striking features is their association with lipid microdomains, which consist mainly of sphingolipids and sterols. GPI-anchored proteins modulate various biological functions when they are incorporated into these specialized domains. The biosynthesis of GPI and its attachment to proteins occurs in the endoplasmic reticulum. The lipid moieties of GPI-anchored proteins are further modified during their transport to the cell surface, and these remodeling processes are essential for the association of proteins with lipid microdomains. Recently, several genes required for GPI lipid remodeling have been identified in yeast and mammalian cells. In this review, we describe the pathways for lipid remodeling of GPI-anchored proteins in yeast and mammalian cells, and discuss how lipid remodeling affects the association of GPI-anchored proteins with microdomains in cellular events.
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Affiliation(s)
- Morihisa Fujita
- Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8566, Japan
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48
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A chemical approach to unraveling the biological function of the glycosylphosphatidylinositol anchor. Proc Natl Acad Sci U S A 2007; 104:20332-7. [PMID: 18077333 DOI: 10.1073/pnas.0710139104] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The glycosylphosphatidylinositol (GPI) anchor is a C-terminal posttranslational modification found on many eukaryotic proteins that reside in the outer leaflet of the cell membrane. The complex and diverse structures of GPI anchors suggest a rich spectrum of biological functions, but few have been confirmed experimentally because of the lack of appropriate techniques that allow for structural perturbation in a cellular context. We previously synthesized a series of GPI anchor analogs with systematic deletions within the glycan core and coupled them to the GFP by a combination of expressed protein ligation and native chemical ligation [Paulick MG, Wise AR, Forstner MB, Groves JT, Bertozzi CR (2007) J Am Chem Soc 129:11543-11550]. Here we investigate the behavior of these GPI-protein analogs in living cells. These modified proteins integrated into the plasma membranes of a variety of mammalian cells and were internalized and directed to recycling endosomes similarly to GFP bearing a native GPI anchor. The GPI-protein analogs also diffused freely in cellular membranes. However, changes in the glycan structure significantly affected membrane mobility, with the loss of monosaccharide units correlating to decreased diffusion. Thus, this cellular system provides a platform for dissecting the contributions of various GPI anchor components to their biological function.
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Abstract
The role of cholesterol in the regulation of endosome motility was investigated by monitoring the intracellular trafficking of endocytosed folate receptors (FRs) labeled with fluorescent folate conjugates. Real-time fluorescence imaging of HeLa cells transfected with green fluorescent protein-tubulin revealed that FR-containing endosomes migrate along microtubules. Moreover, microinjection with antibodies that inhibit microtubule-associated motor proteins demonstrated that dynein and kinesin I participate in the delivery of FR-containing endosomes to the perinuclear area and plasma membrane, respectively. Further, single-particle tracking analysis revealed bidirectional motions of FR endosomes, mediated by dynein and kinesin motors associated with the same endosome. These experimental tools allowed us to use FR-containing endosomes to evaluate the impact of cholesterol on intracellular membrane trafficking. Lowering plasma membrane cholesterol by metabolic depletion or methyl-beta-cyclodextrin extraction was found to both increase FR-containing endosome motility and change endosome distribution from colocalization with Rab7 to colocalization with Rab4. These data provide evidence that cholesterol regulates intracellular membrane trafficking via modulation of the distribution of low molecular weight G-proteins that are adaptors for microtubule motors.
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50
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Ren Y, Wong SM, Lim LY. Folic Acid-Conjugated Protein Cages of a Plant Virus: A Novel Delivery Platform for Doxorubicin. Bioconjug Chem 2007; 18:836-43. [PMID: 17407258 DOI: 10.1021/bc060361p] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The protein cage of a plant virus may provide a template for monodispersed nanosized systems for drug delivery. Using the Hibiscus chlorotic ringspot virus (HCRSV) as a model plant virus, we have prepared nanosized protein cages (30 nm) capable of encapsulating the anticancer drug, doxorubicin. The technique utilized the simultaneous encapsulation of a polyprotic acid of mw 200 kDa to produce an encapsulation efficiency for doxorubicin of about 7.5%. Folic acid was conjugated onto the capsids to impart cancer-targeting capability. The resultant nanosized systems improved the uptake and cytotoxicity of doxorubicin in the ovarian cancer cells, OVCAR-3, with statistical significance. Plant virus capsids may therefore provide viable templates for targeted drug delivery in cancer chemotherapy.
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Affiliation(s)
- Yupeng Ren
- Department of Pharmacy, National University of Singapore, Science Drive 4, Singapore 117543
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