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Kaya B, Smith H, Chen Y, Azad MG, M Russell T, Richardson V, Bernhardt PV, Dharmasivam M, Richardson DR. Targeting lysosomes by design: novel N-acridine thiosemicarbazones that enable direct detection of intracellular drug localization and overcome P-glycoprotein (Pgp)-mediated resistance. Chem Sci 2024:d4sc04339a. [PMID: 39165729 PMCID: PMC11331336 DOI: 10.1039/d4sc04339a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 07/31/2024] [Indexed: 08/22/2024] Open
Abstract
Innovative N-acridine thiosemicarbazones (NATs) were designed along with their iron(iii), copper(ii), and zinc(ii) complexes. Lysosomal targeting was promoted by specifically incorporating the lysosomotropic Pgp substrate, acridine, into the thiosemicarbazone scaffold to maintain the tridentate N, N, S-donor system. The acridine moiety enables a significant advance in thiosemicarbazone design, since: (1) it enables tracking of the drugs by confocal microscopy using its inherent fluorescence; (2) it is lysosomotropic enabling lysosomal targeting; and (3) as acridine is a P-glycoprotein (Pgp) substrate, it facilitates lysosomal targeting, resulting in the drug overcoming Pgp-mediated resistance. These new N-acridine analogues are novel, and this is the first time that acridine has been specifically added to the thiosemicarbazone framework to achieve the three important properties above. These new agents displayed markedly greater anti-proliferative activity against resistant Pgp-expressing cells than very low Pgp-expressing cells. The anti-proliferative activity of NATs against multiple Pgp-positive cancer cell-types (colon, lung, and cervical carcinoma) was abrogated by the third generation Pgp inhibitor, Elacridar, and also Pgp siRNA that down-regulated Pgp. Confocal microscopy demonstrated that low Pgp in KB31 (-Pgp) cells resulted in acridine's proclivity for DNA intercalation promoting NAT nuclear-targeting. In contrast, high Pgp in KBV1 (+Pgp) cells led to NAT lysosomal sequestration, preventing its nuclear localisation. High Pgp expression in KBV1 (+Pgp) cells resulted in co-localization of NATs with the lysosomal marker, LysoTracker™, that was significantly (p < 0.001) greater than the positive control, the di-2-pyridylketone-4-cyclohexyl-4-methyl-3-thiosemicarbazone (DpC) Zn(ii) complex, [Zn(DpC)2]. Incorporation of acridine into the thiosemicarbazone scaffold led to Pgp-mediated transport into lysosomes to overcome Pgp-resistance.
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Affiliation(s)
- Busra Kaya
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
| | - Henry Smith
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
| | - Yanbing Chen
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
| | - Mahan Gholam Azad
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
- Department of Pathology and Bosch Institute, Molecular Pharmacology and Pathology Program, University of Sydney Sydney New South Wales Australia
| | - Tiffany M Russell
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
| | - Vera Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
- Department of Pathology and Bosch Institute, Molecular Pharmacology and Pathology Program, University of Sydney Sydney New South Wales Australia
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland Brisbane 4072 Australia
| | - Mahendiran Dharmasivam
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
- Department of Pathology and Bosch Institute, Molecular Pharmacology and Pathology Program, University of Sydney Sydney New South Wales Australia
| | - Des R Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University Nathan Brisbane 4111 Queensland Australia
- Department of Pathology and Bosch Institute, Molecular Pharmacology and Pathology Program, University of Sydney Sydney New South Wales Australia
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine Nagoya 466-8550 Japan
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Nixon RA, Rubinsztein DC. Mechanisms of autophagy-lysosome dysfunction in neurodegenerative diseases. Nat Rev Mol Cell Biol 2024:10.1038/s41580-024-00757-5. [PMID: 39107446 DOI: 10.1038/s41580-024-00757-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2024] [Indexed: 08/15/2024]
Abstract
Autophagy is a lysosome-based degradative process used to recycle obsolete cellular constituents and eliminate damaged organelles and aggregate-prone proteins. Their postmitotic nature and extremely polarized morphologies make neurons particularly vulnerable to disruptions caused by autophagy-lysosomal defects, especially as the brain ages. Consequently, mutations in genes regulating autophagy and lysosomal functions cause a wide range of neurodegenerative diseases. Here, we review the role of autophagy and lysosomes in neurodegenerative diseases such as Alzheimer disease, Parkinson disease and frontotemporal dementia. We also consider the strong impact of cellular ageing on lysosomes and autophagy as a tipping point for the late-age emergence of related neurodegenerative disorders. Many of these diseases have primary defects in autophagy, for example affecting autophagosome formation, and in lysosomal functions, especially pH regulation and calcium homeostasis. We have aimed to provide an integrative framework for understanding the central importance of autophagic-lysosomal function in neuronal health and disease.
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Affiliation(s)
- Ralph A Nixon
- Center for Dementia Research, Nathan Kline Institute, Orangeburg, New York, NY, USA.
- Department of Psychiatry, New York University Grossman School of Medicine, New York, NY, USA.
- Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA.
- Neuroscience Institute, New York University Grossman School of Medicine, New York, NY, USA.
| | - David C Rubinsztein
- Department of Medical Genetics, Cambridge Institute for Medical Research, Cambridge, UK
- UK Dementia Research Institute, University of Cambridge, Cambridge Institute for Medical Research, Cambridge, UK
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Shah DS, Nisr RB, Krasteva‐Christ G, Hundal HS. Caveolin-3 loss linked with the P104L LGMD-1C mutation modulates skeletal muscle mTORC1 signalling and cholesterol homeostasis. J Cachexia Sarcopenia Muscle 2023; 14:2310-2326. [PMID: 37671684 PMCID: PMC10570080 DOI: 10.1002/jcsm.13317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 07/20/2023] [Accepted: 07/31/2023] [Indexed: 09/07/2023] Open
Abstract
BACKGROUND Caveolins are the principal structural components of plasma membrane caveolae. Dominant pathogenic mutations in the muscle-specific caveolin-3 (Cav3) gene isoform, such as the limb girdle muscular dystrophy type 1C (LGMD-1C) P104L mutation, result in dramatic loss of the Cav3 protein and pathophysiological muscle weakness/wasting. We hypothesize that such muscle degeneration may be linked to disturbances in signalling events that impact protein turnover. Herein, we report studies assessing the effects of Cav3 deficiency on mammalian or mechanistic target of rapamycin complex 1 (mTORC1) signalling in skeletal muscle cells. METHODS L6 myoblasts were stably transfected with Cav3P104L or expression of native Cav3 was abolished by CRISPR/Cas9 genome editing (Cav3 knockout [Cav3KO]) prior to performing subcellular fractionation and immunoblotting, analysis of real-time mitochondrial respiration or fixed cell immunocytochemistry. Skeletal muscle from wild-type and Cav3-/- mice was processed for immunoblot analysis of downstream mTORC1 substrate phosphorylation. RESULTS Cav3 was detected in lysosomal-enriched membranes isolated from L6 myoblasts and observed by confocal microscopy to co-localize with lysosomal-specific markers. Cav3P104L expression, which results in significant (~95%) loss of native Cav3, or CRISPR/Cas9-mediated Cav3KO, reduced amino acid-dependent mTORC1 activation. The decline in mTORC1-directed signalling was detected by immunoblot analysis of L6 muscle cells and gastrocnemius Cav3-/- mouse muscle as judged by reduced phosphorylation of mTORC1 substrates that play key roles in the initiation of protein synthesis (4EBP1S65 and S6K1T389 ). S6K1T389 and 4EBP1S65 phosphorylation reduced by over 75% and 80% in Cav3KO muscle cells and by over 90% and 30% in Cav3-/- mouse skeletal muscle, respectively. The reduction in protein synthetic capacity in L6 muscle cells was confirmed by analysis of puromycylated peptides using the SUnSET assay. Cav3 loss was also associated with a 26% increase in lysosomal cholesterol, and pharmacological manipulation of lysosomal cholesterol was effective in replicating the reduction in mTORC1 activity observed in Cav3KO cells. Notably, re-expression of Cav3 in Cav3KO myoblasts normalized lysosomal cholesterol content, which coincided with a recovery in protein translation and an associated increase in mTORC1-directed phosphorylation of downstream targets. CONCLUSIONS Our findings indicate that Cav3 can localize on lysosomal membranes and is a novel regulator of mTORC1 signalling in muscle. Cav3 deficiency associated with the Cav3P104L mutation impairs mTORC1 activation and protein synthetic capacity in skeletal muscle cells, which may be linked to disturbances in lysosomal cholesterol trafficking and contribute to the pathology of LGMD-1C.
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Affiliation(s)
- Dinesh S. Shah
- Division of Cell Signalling and Immunology, Sir James Black Centre, School of Life SciencesUniversity of DundeeDundeeDD1 5EHUK
| | - Raid B. Nisr
- Division of Cell Signalling and Immunology, Sir James Black Centre, School of Life SciencesUniversity of DundeeDundeeDD1 5EHUK
| | | | - Harinder S. Hundal
- Division of Cell Signalling and Immunology, Sir James Black Centre, School of Life SciencesUniversity of DundeeDundeeDD1 5EHUK
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Shu Y, Jin S. Caveolin-1 in endothelial cells: A potential therapeutic target for atherosclerosis. Heliyon 2023; 9:e18653. [PMID: 37554846 PMCID: PMC10405014 DOI: 10.1016/j.heliyon.2023.e18653] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/17/2023] [Accepted: 07/24/2023] [Indexed: 08/10/2023] Open
Abstract
Atherosclerosis (AS) is a chronic vascular disease characterized by lipid accumulation and the activation of the inflammatory response; it remains the leading nation-wide cause of death. Early in the progression of AS, stimulation by pro-inflammatory agonists (TNF-α, LPS, and others), oxidized lipoproteins (ox-LDL), and biomechanical stimuli (low shear stress) lead to endothelial cell activation and dysfunction. Consequently, it is crucial to investigate how endothelial cells respond to different stressors and ways to alter endothelial cell activation in AS development, as they are the earliest cells to respond. Caveolin-1 (Cav1) is a 21-24-kDa membrane protein located in caveolae and highly expressed in endothelial cells, which plays a vital role in regulating lipid transport, inflammatory responses, and various cellular signaling pathways and has atherogenic effects. This review summarizes recent studies on the structure and physiological functions of Cav1 and outlines the potential mechanisms it mediates in AS development. Included are the roles of Cav1 in the regulation of endothelial cell autophagy, response to shear stress, modulation of the eNOS/NO axis, and transduction of inflammatory signaling pathways. This review provides a rationale for proposing Cav1 as a novel target for the prevention of AS, as well as new ideas for therapeutic strategies for early AS.
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Affiliation(s)
- Yan Shu
- Department of Endocrinology, Institute of Geriatric Medicine, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, 39 Lake Road, East Lake Ecological Scenic, Wuhan, 430077, China
| | - Si Jin
- Department of Endocrinology, Institute of Geriatric Medicine, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology, 39 Lake Road, East Lake Ecological Scenic, Wuhan, 430077, China
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Jiang X, Wu S, Hu C. A narrative review of the role of exosomes and caveolin-1 in liver diseases and cancer. Int Immunopharmacol 2023; 120:110284. [PMID: 37196562 DOI: 10.1016/j.intimp.2023.110284] [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: 02/18/2023] [Revised: 04/16/2023] [Accepted: 05/02/2023] [Indexed: 05/19/2023]
Abstract
Exosomes are nanoscale (40-100 nm) vesicles secreted by different types of cells and have attracted extensive interest in recent years because of their unique role in disease development. It can carry related goods, such as lipids, proteins, and nucleic acids, to mediate intercellular communication. This review summarizes exosome biogenesis, release, uptake, and their role in mediating the development of liver diseases and cancer, such as viral hepatitis, drug-induced liver injury, alcohol-related liver disease, non-alcoholic fatty liver disease, hepatocellular carcinoma, and other tumors. Meanwhile, a fossa structural protein, caveolin-1(CAV-1), has also been proposed to be involved in the development of various diseases, especially liver diseases and tumors. In this review, we discuss the role of CAV-1 in liver diseases and different tumor stages (inhibition of early growth and promotion of late metastasis) and the underlying mechanisms by which CAV-1 regulates the process. In addition, CAV-1 has also been found to be a secreted protein that can be released directly through the exosome pathway or change the cargo composition of the exosomes, thus contributing to enhancing the metastasis and invasion of cancer cells during the late stage of tumor development. In conclusion, the role of CAV-1 and exosomes in disease development and the association between them remains to be one challenging uncharted area.
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Affiliation(s)
- Xiangfu Jiang
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei 230032, China; Institute for Liver Diseases of Anhui Medical University, School of Pharmacy, Anhui medical university, Hefei 230032, China; Key Laboratory of anti-inflammatory and Immune Medicine, Ministry of Education, Hefei 230032, China
| | - Shuai Wu
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei 230032, China; Institute for Liver Diseases of Anhui Medical University, School of Pharmacy, Anhui medical university, Hefei 230032, China; Key Laboratory of anti-inflammatory and Immune Medicine, Ministry of Education, Hefei 230032, China
| | - Chengmu Hu
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei 230032, China; Institute for Liver Diseases of Anhui Medical University, School of Pharmacy, Anhui medical university, Hefei 230032, China; Key Laboratory of anti-inflammatory and Immune Medicine, Ministry of Education, Hefei 230032, China.
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Lengauer F, Geisslinger F, Gabriel A, von Schwarzenberg K, Vollmar AM, Bartel K. A metabolic shift toward glycolysis enables cancer cells to maintain survival upon concomitant glutamine deprivation and V-ATPase inhibition. Front Nutr 2023; 10:1124678. [PMID: 37255933 PMCID: PMC10225586 DOI: 10.3389/fnut.2023.1124678] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 05/02/2023] [Indexed: 06/01/2023] Open
Abstract
It is widely known that most cancer cells display an increased reliance on glutaminolysis to sustain proliferation and survival. Combining glutamine deprivation with additional anti-cancer therapies is an intensively investigated approach to increase therapeutic effectiveness. In this study, we examined a combination of glutamine deprivation by starvation or pharmacological tools, with the anti-cancer agent archazolid, an inhibitor of the lysosomal V-ATPase. We show that glutamine deprivation leads to lysosomal acidification and induction of pro-survival autophagy, which could be prevented by archazolid. Surprisingly, a combination of glutamine deprivation with archazolid did not lead to synergistic induction of cell death or reduction in proliferation. Investigating the underlying mechanisms revealed elevated expression and activity of amino acid transporters SLC1A5, SLC38A1 upon starvation, whereas archazolid had no additional effect. Furthermore, we found that the export of lysosomal glutamine derived from exogenous sources plays no role in the phenotype as knock-down of SLC38A7, the lysosomal glutamine exporter, could not increase V-ATPase inhibition-induced cell death or reduce proliferation. Analysis of the cellular metabolic phenotype revealed that glutamine deprivation led to a significant increase in glycolytic activity, indicated by an elevated glycolytic capacity and reserve, when V-ATPase function was inhibited concomitantly. This was confirmed by increased glutamine uptake, augmented lactate production, and an increase in hexokinase activity. Our study, therefore, provides evidence, that glutamine deprivation induces autophagy, which can be prevented by simultaneous inhibition of V-ATPase function. However, this does not lead to a therapeutic benefit, as cells are able to circumvent cell death and growth inhibition by a metabolic shift toward glycolysis.
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Peruzzu D, Boussadia Z, Fratini F, Spadaro F, Bertuccini L, Sanchez M, Carollo M, Matarrese P, Falchi M, Iosi F, Raggi C, Parolini I, Carè A, Sargiacomo M, Gagliardi MC, Fecchi K. Inhibition of cholesterol transport impairs Cav-1 trafficking and small extracellular vesicles secretion, promoting amphisome formation in melanoma cells. Traffic 2023; 24:76-94. [PMID: 36519961 DOI: 10.1111/tra.12878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 11/22/2022] [Accepted: 12/06/2022] [Indexed: 12/23/2022]
Abstract
Caveolin-1 (Cav-1) is a fundamental constituent of caveolae, whose functionality and structure are strictly dependent on cholesterol. In this work the U18666A inhibitor was used to study the role of cholesterol transport in the endosomal degradative-secretory system in a metastatic human melanoma cell line (WM266-4). We found that U18666A induces a shift of Cav-1 from the plasma membrane to the endolysosomal compartment, which is involved, through Multi Vesicular Bodies (MVBs), in the formation and release of small extracellular vesicles (sEVs). Moreover, this inhibitor induces an increase in the production of sEVs with chemical-physical characteristics similar to control sEVs but with a different protein composition (lower expression of Cav-1 and increase of LC3II) and reduced transfer capacity on target cells. Furthermore, we determined that U18666A affects mitochondrial function and also cancer cell aggressive features, such as migration and invasion. Taken together, these results indicate that the blockage of cholesterol transport, determining the internalization of Cav-1, may modify sEVs secretory pathways through an increased fusion between autophagosomes and MVBs to form amphisome, which in turn fuses with the plasma membrane releasing a heterogeneous population of sEVs to maintain homeostasis and ensure correct cellular functionality.
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Affiliation(s)
- Daniela Peruzzu
- Center for Gender-Specific Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Zaira Boussadia
- National Center for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
| | - Federica Fratini
- Core Facilities Technical Scientific Service, Istituto Superiore di Sanità, Rome, Italy
| | - Francesca Spadaro
- Core Facilities Technical Scientific Service, Istituto Superiore di Sanità, Rome, Italy
| | - Lucia Bertuccini
- Core Facilities Technical Scientific Service, Istituto Superiore di Sanità, Rome, Italy
| | - Massimo Sanchez
- Core Facilities Technical Scientific Service, Istituto Superiore di Sanità, Rome, Italy
| | - Maria Carollo
- Core Facilities Technical Scientific Service, Istituto Superiore di Sanità, Rome, Italy
| | - Paola Matarrese
- Center for Gender-Specific Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Mario Falchi
- National Center for HIV/AIDS Research, Istituto Superiore di Sanità, Rome
| | - Francesca Iosi
- Core Facilities Technical Scientific Service, Istituto Superiore di Sanità, Rome, Italy
| | - Carla Raggi
- National Center for the control and evaluation of Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Isabella Parolini
- Department Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Alessandra Carè
- Center for Gender-Specific Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Massimo Sargiacomo
- National Center for Global Health, Istituto Superiore di Sanità, Rome, Italy
| | | | - Katia Fecchi
- Center for Gender-Specific Medicine, Istituto Superiore di Sanità, Rome, Italy
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Wang Y, Wang M, Liu Y, Tao H, Banerjee S, Srinivasan S, Nemeth E, Czaja MJ, He P. Integrated regulation of stress responses, autophagy and survival by altered intracellular iron stores. Redox Biol 2022; 55:102407. [PMID: 35853304 PMCID: PMC9294649 DOI: 10.1016/j.redox.2022.102407] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 07/07/2022] [Accepted: 07/11/2022] [Indexed: 02/06/2023] Open
Abstract
Iron is a mineral essential for blood production and a variety of critical cellular functions. Altered iron metabolism has been increasingly observed in many diseases and disorders, but a comprehensive and mechanistic understanding of the cellular impact of impaired iron metabolism is still lacking. We examined the effects of iron overload or iron deficiency on cellular stress responses and autophagy which collectively regulate cell homeostasis and survival. Acute iron loading led to increased mitochondrial ROS (mtROS) production and damage, lipid peroxidation, impaired autophagic flux, and ferroptosis. Iron-induced mtROS overproduction is the mechanism of increased lipid peroxidation, impaired autophagy, and the induction of ferroptosis. Iron excess-induced ferroptosis was cell-type dependent and regulated by activating transcription factor 4 (ATF4). Upregulation of ATF4 mitigated iron-induced autophagic dysfunction and ferroptosis, whereas silencing of ATF4 expression impaired autophagy and resulted in increased mtROS production and ferroptosis. Employing autophagy-deficient hepatocytes and different autophagy inhibitors, we further showed that autophagic impairment sensitized cells to iron-induced ferroptosis. In contrast, iron deficiency activated the endoplasmic reticulum (ER) stress response, decreased autophagy, and induced apoptosis. Decreased autophagy associated with iron deficiency was due to ER stress, as reduction of ER stress by 4-phenylbutyric acid (4-PBA) improved autophagic flux. The mechanism of decreased autophagy in iron deficiency is a disruption in lysosomal biogenesis due to impaired posttranslational maturation of lysosomal membrane proteins. In conclusion, iron excess and iron deficiency cause different forms of cell stress and death in part through the common mechanism of impaired autophagic function.
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Affiliation(s)
- Yunyang Wang
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Mo Wang
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Yunshan Liu
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Hui Tao
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Somesh Banerjee
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Shanthi Srinivasan
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA; Gastroenterology Research, Atlanta VA Health Care System, Decatur, GA, USA
| | - Elizabeta Nemeth
- Department of Medicine, Center for Iron Disorders, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Mark J Czaja
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Peijian He
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA.
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Herrera GA, del Pozo-Yauner L, Teng J, Zeng C, Shen X, Moriyama T, Ramirez Alcantara V, Liu B, Turbat-Herrera EA. Glomerulopathic Light Chain-Mesangial Cell Interactions: Sortilin-Related Receptor (SORL1) and Signaling. Kidney Int Rep 2021; 6:1379-1396. [PMID: 34013116 PMCID: PMC8116754 DOI: 10.1016/j.ekir.2021.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 02/08/2021] [Indexed: 12/28/2022] Open
Abstract
INTRODUCTION Deciphering the intricacies of the interactions of glomerulopathic Ig light chains with mesangial cells is key to delineate signaling events responsible for the mesangial pathologic alterations that ensue. METHODS Human mesangial cells, caveolin 1 (CAV1), wild type (WT) ,and knockout (KO), were incubated with glomerulopathic light chains purified from the urine of patients with light chain-associated (AL) amyloidosis or light chain deposition disease. Associated signaling events induced by surface interactions of glomerulopathic light chains with caveolins and other membrane proteins, as well as the effect of epigallocatechin-3-gallate (EGCG) on the capacity of mesangial cells to intracellularly process AL light chains were investigated using a variety of techniques, including chemical crosslinking with mass spectroscopy, immunofluorescence, and ultrastructural immunolabeling. RESULTS Crosslinking experiments provide evidence suggesting that sortilin-related receptor (SORL1), a transmembrane sorting receptor that regulates cellular trafficking of proteins, is a component of the receptor on mesangial cells for glomerulopathic light chains. Colocalization of glomerulopathic light chains with SORL1 in caveolae and also in lysosomes when light chain internalization occurred, was documented using double immunofluorescence and immunogold labeling ultrastructural techniques. It was found that EGCG directly blocks c-Fos cytoplasmic to nuclei signal translocation after interactions of AL light chains with mesangial cells, resulting in a decrease in amyloid formation. CONCLUSION Our findings document for the first time a role for SORL1 linked to glomerular pathology and signaling events that take place when certain monoclonal light chains interact with mesangial cells. This finding may lead to novel therapies for treating renal injury caused by glomerulopathic light chains.
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Affiliation(s)
- Guillermo A. Herrera
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
- Department of Physiology and Cell Biology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
- Correspondence: Guillermo A. Herrera, Department of Pathology, University of South Alabama, College of Medicine, 2451 USA Medical Center Drive, Mobile, Alabama 36617, USA.
| | - Luis del Pozo-Yauner
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Jiamin Teng
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Chun Zeng
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Xinggui Shen
- Louisiana State University, Health Sciences Center, Shreveport, Louisiana, USA
| | - Takahito Moriyama
- Department of Medicine, Kidney Center, Tokyo Women’s Medical University, Tokyo, Japan
| | | | - Bing Liu
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
| | - Elba A. Turbat-Herrera
- Department of Pathology, College of Medicine, University of South Alabama, Mobile, Alabama, USA
- Mitchell Cancer Institute, College of Medicine, University of South Alabama, Mobile, Alabama, USA
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Hać A, Pierzynowska K, Herman-Antosiewicz A. S6K1 Is Indispensible for Stress-Induced Microtubule Acetylation and Autophagic Flux. Cells 2021; 10:929. [PMID: 33920542 PMCID: PMC8073773 DOI: 10.3390/cells10040929] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/09/2021] [Accepted: 04/13/2021] [Indexed: 12/19/2022] Open
Abstract
Autophagy is a specific macromolecule and organelle degradation process. The target macromolecule or organelle is first enclosed in an autophagosome, and then delivered along acetylated microtubules to the lysosome. Autophagy is triggered by stress and largely contributes to cell survival. We have previously shown that S6K1 kinase is essential for autophagic flux under stress conditions. Here, we aimed to elucidate the underlying mechanism of S6K1 involvement in autophagy. We stimulated autophagy in S6K1/2 double-knockout mouse embryonic fibroblasts by exposing them to different stress conditions. Transient gene overexpression or silencing, immunoblotting, immunofluorescence, flow cytometry, and ratiometric fluorescence analyses revealed that the perturbation of autophagic flux in S6K1-deficient cells did not stem from impaired lysosomal function. Instead, the absence of S6K1 abolished stress-induced tubulin acetylation and disrupted the acetylated microtubule network, in turn impairing the autophagosome-lysosome fusion. S6K1 overexpression restored tubulin acetylation and autophagic flux in stressed S6K1/2-deficient cells. Similar effect of S6K1 status was observed in prostate cancer cells. Furthermore, overexpression of an acetylation-mimicking, but not acetylation-resistant, tubulin variant effectively restored autophagic flux in stressed S6K1/2-deficient cells. Collectively, S6K1 controls tubulin acetylation, hence contributing to the autophagic flux induced by different stress conditions and in different cells.
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Affiliation(s)
- Aleksandra Hać
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Karolina Pierzynowska
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Anna Herman-Antosiewicz
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland
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11
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Albacete-Albacete L, Navarro-Lérida I, López JA, Martín-Padura I, Astudillo AM, Ferrarini A, Van-Der-Heyden M, Balsinde J, Orend G, Vázquez J, Del Pozo MÁ. ECM deposition is driven by caveolin-1-dependent regulation of exosomal biogenesis and cargo sorting. J Cell Biol 2021; 219:211453. [PMID: 33053168 PMCID: PMC7551399 DOI: 10.1083/jcb.202006178] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/31/2020] [Accepted: 08/03/2020] [Indexed: 12/16/2022] Open
Abstract
The composition and physical properties of the extracellular matrix (ECM) critically influence tumor progression, but the molecular mechanisms underlying ECM layering are poorly understood. Tumor–stroma interaction critically depends on cell communication mediated by exosomes, small vesicles generated within multivesicular bodies (MVBs). We show that caveolin-1 (Cav1) centrally regulates exosome biogenesis and exosomal protein cargo sorting through the control of cholesterol content at the endosomal compartment/MVBs. Quantitative proteomics profiling revealed that Cav1 is required for exosomal sorting of ECM protein cargo subsets, including Tenascin-C (TnC), and for fibroblast-derived exosomes to efficiently deposit ECM and promote tumor invasion. Cav1-driven exosomal ECM deposition not only promotes local stromal remodeling but also the generation of distant ECM-enriched stromal niches in vivo. Cav1 acts as a cholesterol rheostat in MVBs, determining sorting of ECM components into specific exosome pools and thus ECM deposition. This supports a model by which Cav1 is a central regulatory hub for tumor–stroma interactions through a novel exosome-dependent ECM deposition mechanism.
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Affiliation(s)
- Lucas Albacete-Albacete
- Mechanoadaptation and Caveolae Biology Laboratory, Cell and Developmental Biology Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Inmaculada Navarro-Lérida
- Mechanoadaptation and Caveolae Biology Laboratory, Cell and Developmental Biology Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Juan Antonio López
- Cardiovascular Proteomics Lab, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares, Madrid, Spain
| | - Inés Martín-Padura
- Mechanoadaptation and Caveolae Biology Laboratory, Cell and Developmental Biology Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Alma M Astudillo
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas, Universidad de Valladolid, Valladolid, Spain.,Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, Madrid, Spain
| | - Alessia Ferrarini
- Cardiovascular Proteomics Lab, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Michael Van-Der-Heyden
- Institut National de la Santé et de la Recherche Médicale U1109-MN3T, The Microenvironmental Niche in Tumorigenesis and Targeted Therapy, Université de Strasbourg, LabEx Medalis, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France
| | - Jesús Balsinde
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas, Universidad de Valladolid, Valladolid, Spain.,Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas, Instituto de Salud Carlos III, Madrid, Spain
| | - Gertraud Orend
- Institut National de la Santé et de la Recherche Médicale U1109-MN3T, The Microenvironmental Niche in Tumorigenesis and Targeted Therapy, Université de Strasbourg, LabEx Medalis, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France
| | - Jesús Vázquez
- Cardiovascular Proteomics Lab, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares, Madrid, Spain
| | - Miguel Ángel Del Pozo
- Mechanoadaptation and Caveolae Biology Laboratory, Cell and Developmental Biology Area, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
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12
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Decotret LR, Wadsworth BJ, Li LV, Lim CJ, Bennewith KL, Pallen CJ. Receptor-type protein tyrosine phosphatase alpha (PTPα) mediates MMP14 localization and facilitates triple-negative breast cancer cell invasion. Mol Biol Cell 2021; 32:567-578. [PMID: 33566639 PMCID: PMC8101463 DOI: 10.1091/mbc.e20-01-0060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The ability of cancer cells to invade surrounding tissues requires degradation of the extracellular matrix (ECM). Invasive structures, such as invadopodia, form on the plasma membranes of cancer cells and secrete ECM-degrading proteases that play crucial roles in cancer cell invasion. We have previously shown that the protein tyrosine phosphatase alpha (PTPα) regulates focal adhesion formation and migration of normal cells. Here we report a novel role for PTPα in promoting triple-negative breast cancer cell invasion in vitro and in vivo. We show that PTPα knockdown reduces ECM degradation and cellular invasion of MDA-MB-231 cells through Matrigel. PTPα is not a component of TKS5-positive structures resembling invadopodia; rather, PTPα localizes with endosomal structures positive for MMP14, caveolin-1, and early endosome antigen 1. Furthermore, PTPα regulates MMP14 localization to plasma membrane protrusions, suggesting a role for PTPα in intracellular trafficking of MMP14. Importantly, we show that orthotopic MDA-MB-231 tumors depleted in PTPα exhibit reduced invasion into the surrounding mammary fat pad. These findings suggest a novel role for PTPα in regulating the invasion of triple-negative breast cancer cells.
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Affiliation(s)
- Lisa R Decotret
- Integrative Oncology, BC Cancer, Vancouver, British Columbia, BC V5Z 4E6, Canada.,Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, Vancouver, British Columbia, BC V5Z 4H4, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada
| | - Brennan J Wadsworth
- Integrative Oncology, BC Cancer, Vancouver, British Columbia, BC V5Z 4E6, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada
| | - Ling Vicky Li
- Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, Vancouver, British Columbia, BC V5Z 4H4, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada
| | - Chinten J Lim
- Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, Vancouver, British Columbia, BC V5Z 4H4, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada.,Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada
| | - Kevin L Bennewith
- Integrative Oncology, BC Cancer, Vancouver, British Columbia, BC V5Z 4E6, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada
| | - Catherine J Pallen
- Michael Cuccione Childhood Cancer Research Program, BC Children's Hospital Research Institute, Vancouver, British Columbia, BC V5Z 4H4, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada.,Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, BC V6H 3V4, Canada
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13
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Zhang C, Wu Q, Huang H, Chen X, Huang T, Li W, Zhang J, Liu Y. Caveolin-1 upregulates Fut8 expression by activating the Wnt/β-catenin pathway to enhance HCC cell proliferative and invasive ability. Cell Biol Int 2020; 44:2202-2212. [PMID: 32710651 DOI: 10.1002/cbin.11426] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 07/12/2020] [Accepted: 07/23/2020] [Indexed: 01/09/2023]
Abstract
Caveolin-1 (Cav-1), a critical structural protein of caveolae, plays an oncogenic role by participating in abnormal protein glycosylation in hepatocellular carcinoma (HCC). However, the mechanism by which Cav-1 regulates glycosylation and glycosyltransferase expression has yet to be fully defined. Here, we show that Cav-1 promotes the expression of α-1,6-fucosyltransferase (Fut8), which catalyzes the transfer of GDP-fucose to the core structure of the N-sugar chain. In this study, we show that the mouse HCC cell line, Hepa1-6, which has low Fut8 transcriptional and protein levels, also lacks Cav-1 expression, whereas the mouse HCC cell line, Hca-F, has strong Fut8 expression and high transcriptional and protein levels of Cav-1. Subsequently, Cav-1 overexpression in Hepa1-6 was found to activate Wnt/β-catenin signaling, which leads to downstream binding of the T cell factor/lymphoid enhancer factor to the Fut8 promoter region for activation of its transcription. In contrast, knockdown of Cav-1 expression in Hca-F caused the Wnt/β-catenin pathway to be significantly inhibited, which attenuates the expression of Fut8. We further show that Cav-1-induced upregulation of Fut8 expression enhanced proliferation and invasion by mouse HCC cells in vitro. Our current findings provide molecular evidence that Cav-1 plays an important role in regulating glycosyltransferase expression and may participate in abnormal glycosylation, which mediates the proliferation and invasion of HCC.
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Affiliation(s)
- Cheng Zhang
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
| | - Qiong Wu
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
| | - Huang Huang
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
| | - Xixi Chen
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
| | - Tianmiao Huang
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
| | - Wenli Li
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China.,School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
| | - Jianing Zhang
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
| | - Yubo Liu
- School of Life and Pharmaceutical Science, Dalian University of Technology, Panjin, China
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14
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Zhang X, Ramírez CM, Aryal B, Madrigal-Matute J, Liu X, Diaz A, Torrecilla-Parra M, Suárez Y, Cuervo AM, Sessa WC, Fernández-Hernando C. Cav-1 (Caveolin-1) Deficiency Increases Autophagy in the Endothelium and Attenuates Vascular Inflammation and Atherosclerosis. Arterioscler Thromb Vasc Biol 2020; 40:1510-1522. [PMID: 32349535 PMCID: PMC7253189 DOI: 10.1161/atvbaha.120.314291] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Supplemental Digital Content is available in the text. Endothelial Cav-1 (caveolin-1) expression plays a relevant role during atherogenesis by controlling NO production, vascular inflammation, LDL (low-density lipoprotein) transcytosis, and extracellular matrix remodeling. Additional studies have identified cholesterol-rich membrane domains as important regulators of autophagy by recruiting ATGs (autophagy-related proteins) to the plasma membrane. Here, we investigate how the expression of Cav-1 in the aortic endothelium influences autophagy and whether enhanced autophagy contributes to the atheroprotective phenotype observed in Cav-1–deficient mice.
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Affiliation(s)
- Xinbo Zhang
- From the Vascular Biology and Therapeutics Program (X.Z., C.M.R., B.A., Y.S., W.C.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology (X.Z., C.M.R., B.A., Y.S., C.F.-H.), Yale University School of Medicine, New Haven, CT
| | - Cristina M Ramírez
- From the Vascular Biology and Therapeutics Program (X.Z., C.M.R., B.A., Y.S., W.C.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology (X.Z., C.M.R., B.A., Y.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,IMDEA Research Institute of Food and Health Sciences, Madrid, Spain (C.M.R., M.T.-P.)
| | - Binod Aryal
- From the Vascular Biology and Therapeutics Program (X.Z., C.M.R., B.A., Y.S., W.C.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology (X.Z., C.M.R., B.A., Y.S., C.F.-H.), Yale University School of Medicine, New Haven, CT
| | - Julio Madrigal-Matute
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY (J.M.-M., A.D., A.M.C.)
| | - Xinran Liu
- Department of Cell Biology (X.L.), Yale University School of Medicine, New Haven, CT
| | - Antonio Diaz
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY (J.M.-M., A.D., A.M.C.)
| | | | - Yajaira Suárez
- From the Vascular Biology and Therapeutics Program (X.Z., C.M.R., B.A., Y.S., W.C.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology (X.Z., C.M.R., B.A., Y.S., C.F.-H.), Yale University School of Medicine, New Haven, CT
| | - Ana M Cuervo
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY (J.M.-M., A.D., A.M.C.)
| | - William C Sessa
- From the Vascular Biology and Therapeutics Program (X.Z., C.M.R., B.A., Y.S., W.C.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,Department of Pharmacology (W.C.S.), Yale University School of Medicine, New Haven, CT
| | - Carlos Fernández-Hernando
- From the Vascular Biology and Therapeutics Program (X.Z., C.M.R., B.A., Y.S., W.C.S., C.F.-H.), Yale University School of Medicine, New Haven, CT.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology (X.Z., C.M.R., B.A., Y.S., C.F.-H.), Yale University School of Medicine, New Haven, CT
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15
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Miao T, Little AC, Aronshtam A, Marquis T, Fenn SL, Hristova M, Krementsov DN, van der Vliet A, Spees JL, Oldinski RA. Internalized FGF-2-Loaded Nanoparticles Increase Nuclear ERK1/2 Content and Result in Lung Cancer Cell Death. NANOMATERIALS 2020; 10:nano10040612. [PMID: 32230722 PMCID: PMC7221911 DOI: 10.3390/nano10040612] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 03/13/2020] [Accepted: 03/16/2020] [Indexed: 12/15/2022]
Abstract
Innovative cancer treatments, which improve adjuvant therapy and reduce adverse events, are desperately needed. Nanoparticles provide controlled intracellular biomolecule delivery in the absence of activating external cell surface receptors. Prior reports suggest that intracrine signaling, following overexpression of basic fibroblast growth factor (FGF-2) after viral transduction, has a toxic effect on diseased cells. Herein, the research goals were to (1) encapsulate recombinant FGF-2 within stable, alginate-based nanoparticles (ABNs) for non-specific cellular uptake, and (2) determine the effects of ABN-mediated intracellular delivery of FGF-2 on cancer cell proliferation/survival. In culture, human alveolar adenocarcinoma basal epithelial cell line (A549s) and immortalized human bronchial epithelial cell line (HBE1s) internalized ABNs through non-selective endocytosis. Compared to A549s exposed to empty (i.e., blank) ABNs, the intracellular delivery of FGF-2 via ABNs significantly increased the levels of lactate dehydrogenase, indicating that FGF-2-ABN treatment decreased the transformed cell integrity. Noticeably, the nontransformed cells were not significantly affected by FGF-2-loaded ABN treatment. Furthermore, FGF-2-loaded ABNs significantly increased nuclear levels of activated-extracellular signal-regulated kinase ½ (ERK1/2) in A549s but had no significant effect on HBE1 nuclear ERK1/2 expression. Our novel intracellular delivery method of FGF-2 via nanoparticles resulted in increased cancer cell death via increased nuclear ERK1/2 activation.
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Affiliation(s)
- Tianxin Miao
- Bioengineering Program, College of Engineering and Mathematical Sciences, Larner College of Medicine, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405, USA (S.L.F.)
| | - Andrew C. Little
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Burlington, VT 05405, USA; (A.C.L.); (A.v.d.V.)
- Department of Pathology and Laboratory Medicine, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA;
| | - Alexander Aronshtam
- Department of Medicine, Stem Cell Core, Larner College of Medicine, University of Vermont, Colchester, VT 05446, USA; (A.A.); (T.M.)
| | - Taylor Marquis
- Department of Medicine, Stem Cell Core, Larner College of Medicine, University of Vermont, Colchester, VT 05446, USA; (A.A.); (T.M.)
| | - Spencer L. Fenn
- Bioengineering Program, College of Engineering and Mathematical Sciences, Larner College of Medicine, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405, USA (S.L.F.)
| | - Milena Hristova
- Department of Pathology and Laboratory Medicine, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA;
| | - Dimitry N. Krementsov
- Department of Biomedical and Health Sciences, College of Nursing and Health Sciences, University of Vermont, Burlington, VT 05405, USA;
| | - Albert van der Vliet
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Burlington, VT 05405, USA; (A.C.L.); (A.v.d.V.)
- Department of Pathology and Laboratory Medicine, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA;
| | - Jeffrey L. Spees
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Burlington, VT 05405, USA; (A.C.L.); (A.v.d.V.)
- Department of Medicine, Stem Cell Core, Larner College of Medicine, University of Vermont, Colchester, VT 05446, USA; (A.A.); (T.M.)
- Correspondence: (J.L.S.); (R.A.O.); Tel.: +1-802-656-2388 (J.L.S.); +1-802-656-3338 (R.A.O.); Fax: +1-802-656-8932 (J.L.S.); +1-802-656-3358 (R.A.O.)
| | - Rachael A. Oldinski
- Bioengineering Program, College of Engineering and Mathematical Sciences, Larner College of Medicine, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405, USA (S.L.F.)
- Department of Mechanical Engineering, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405, USA
- Department of Electrical and Biomedical Engineering, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405, USA
- Materials Science Program, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405, USA
- Correspondence: (J.L.S.); (R.A.O.); Tel.: +1-802-656-2388 (J.L.S.); +1-802-656-3338 (R.A.O.); Fax: +1-802-656-8932 (J.L.S.); +1-802-656-3358 (R.A.O.)
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16
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Scheffler K, Bilz NC, Brueckner M, Stanifer ML, Boulant S, Claus C, Reibetanz U. Enhanced Uptake and Endosomal Release of LbL Microcarriers Functionalized with Reversible Fusion Proteins. ACS APPLIED BIO MATERIALS 2020; 3:1553-1567. [PMID: 35021646 DOI: 10.1021/acsabm.9b01168] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The efficient application of smart drug-delivery systems requires further improvement of their cellular uptake and in particular their release from endolysosomal compartments into the cytoplasm of target cells. The usage of virus proteins allows for such developments, as viruses have evolved efficient entry mechanisms into the cell, mediated by their fusion proteins. In our investigations, the transferability of the glycoprotein G which is a fusion protein of the vesicular stomatitis virus (VSV-G) onto the surface of a layer-by-layer (LbL) designed microcarrier was investigated. The assembly of VSV-G as a reversible viral fusion protein onto LbL microcarriers indeed induced an enhanced uptake rate on Vero cells as well as a fast and efficient release of the intact carriers from endolysosomes into the cytoplasm. Additionally, neither virus-associated effects on cellular viability nor activation of an interferon response were detected. Our study emphasizes the suitability of VSV-G as an efficient surface functionalization of drug-delivery systems.
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Affiliation(s)
- Kira Scheffler
- Institute for Medical Physics and Biophysics, Faculty of Medicine, University of Leipzig, D-04107 Leipzig, Germany
| | - Nicole C Bilz
- Institute of Virology, Faculty of Medicine, University of Leipzig, 04103 Leipzig, Germany
| | - Mandy Brueckner
- Institute for Medical Physics and Biophysics, Faculty of Medicine, University of Leipzig, D-04107 Leipzig, Germany
| | - Megan L Stanifer
- Schaller Research Group at CellNetworks, Department of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Steeve Boulant
- Schaller Research Group at CellNetworks, Department of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany.,Research Group "Cellular Polarity and Viral Infection" (F140), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Claudia Claus
- Institute of Virology, Faculty of Medicine, University of Leipzig, 04103 Leipzig, Germany
| | - Uta Reibetanz
- Institute for Medical Physics and Biophysics, Faculty of Medicine, University of Leipzig, D-04107 Leipzig, Germany
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17
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Horníková L, Bruštíková K, Forstová J. Microtubules in Polyomavirus Infection. Viruses 2020; 12:E121. [PMID: 31963741 PMCID: PMC7019765 DOI: 10.3390/v12010121] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 12/12/2022] Open
Abstract
Microtubules, part of the cytoskeleton, are indispensable for intracellular movement, cell division, and maintaining cell shape and polarity. In addition, microtubules play an important role in viral infection. In this review, we summarize the role of the microtubules' network during polyomavirus infection. Polyomaviruses usurp microtubules and their motors to travel via early and late acidic endosomes to the endoplasmic reticulum. As shown for SV40, kinesin-1 and microtubules are engaged in the release of partially disassembled virus from the endoplasmic reticulum to the cytosol, and dynein apparently assists in the further disassembly of virions prior to their translocation to the cell nucleus-the place of their replication. Polyomavirus gene products affect the regulation of microtubule dynamics. Early T antigens destabilize microtubules and cause aberrant mitosis. The role of these activities in tumorigenesis has been documented. However, its importance for productive infection remains elusive. On the other hand, in the late phase of infection, the major capsid protein, VP1, of the mouse polyomavirus, counteracts T-antigen-induced destabilization. It physically binds microtubules and stabilizes them. The interaction results in the G2/M block of the cell cycle and prolonged S phase, which is apparently required for successful completion of the viral replication cycle.
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Affiliation(s)
| | | | - Jitka Forstová
- Department of Genetics and Microbiology, Faculty of Science, Charles University, BIOCEV, 25250 Vestec, Czech Republic; (L.H.); (K.B.)
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18
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Xu Q, Shi W, Lv P, Meng W, Mao G, Gong C, Chen Y, Wei Y, He X, Zhao J, Han H, Sun M, Xiao K. Critical role of caveolin-1 in aflatoxin B1-induced hepatotoxicity via the regulation of oxidation and autophagy. Cell Death Dis 2020; 11:6. [PMID: 31919341 PMCID: PMC6952418 DOI: 10.1038/s41419-019-2197-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/08/2019] [Accepted: 12/09/2019] [Indexed: 01/29/2023]
Abstract
Aflatoxin B1 (AFB1) is a potent hepatocarcinogen in humans and exposure to AFB1 is known to cause both acute and chronic hepatocellular injury. As the liver is known to be the main target organ of aflatoxin, it is important to identify the key molecules that participate in AFB1-induced hepatotoxicity and to investigate their underlying mechanisms. In this study, the critical role of caveolin-1 in AFB1-induced hepatic cell apoptosis was examined. We found a decrease in cell viability and an increase in oxidation and apoptosis in human hepatocyte L02 cells after AFB1 exposure. In addition, the intracellular expression of caveolin-1 was increased in response to AFB1 treatment. Downregulation of caveolin-1 significantly alleviated AFB1-induced apoptosis and decreased cell viability, whereas overexpression of caveolin-1 reversed these effects. Further functional analysis showed that caveolin-1 participates in AFB1-induced oxidative stress through its interaction with Nrf2, leading to the downregulation of cellular antioxidant enzymes and the promotion of oxidative stress-induced apoptosis. In addition, caveolin-1 was found to regulate AFB1-induced autophagy. This finding was supported by the effect that caveolin-1 deficiency promoted autophagy after AFB1 treatment, leading to the inhibition of apoptosis, whereas overexpression of caveolin-1 inhibited autophagy and accelerated apoptosis. Interestingly, further investigation showed that caveolin-1 participates in AFB1-induced autophagy by regulating the EGFR/PI3K-AKT/mTOR signaling pathway. Taken together, our data reveal that caveolin-1 plays a crucial role in AFB1-induced hepatic cell apoptosis via the regulation of oxidation and autophagy, which provides a potential target for the development of novel treatments to combat AFB1 hepatotoxicity.
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Affiliation(s)
- Qingqiang Xu
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Wenwen Shi
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Pan Lv
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Wenqi Meng
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Guanchao Mao
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Chuchu Gong
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Yongchun Chen
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Youheng Wei
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Xiaowen He
- Origincell Technology Group Co., Ltd, 1118 Halei Road, Shanghai, 201203, China
| | - Jie Zhao
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China
| | - Hua Han
- School of Medicine, Tongji University, 1239 Siping Road, Shanghai, China.
| | - Mingxue Sun
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China.
| | - Kai Xiao
- Lab of Toxicology and Pharmacology, Faculty of Naval Medicine, Naval Medical University, Shanghai, 200433, China.
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19
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Piperno A, Mazzaglia A, Scala A, Pennisi R, Zagami R, Neri G, Torcasio SM, Rosmini C, Mineo PG, Potara M, Focsan M, Astilean S, Zhou GG, Sciortino MT. Casting Light on Intracellular Tracking of a New Functional Graphene-Based MicroRNA Delivery System by FLIM and Raman Imaging. ACS APPLIED MATERIALS & INTERFACES 2019; 11:46101-46111. [PMID: 31729219 DOI: 10.1021/acsami.9b15826] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The theranostic ability of a new fluorescently labeled cationic cyclodextrin-graphene nanoplatform (GCD@Ada-Rhod) was investigated by studying its intracellular trafficking and its ability to deliver plasmid DNA and microRNA. The nanoplatform was synthesized by both covalent and supramolecular approaches, and its chemical structure, morphology, and colloidal behavior were investigated by TGA, TEM, spectroscopic analysis such as UV-vis, fluorescence emission, DLS, and ζ-potential measurements. The cellular internalization of GCD@Ada-Rhod and its perinuclear localization were assessed by FLIM, Raman imaging, and fluorescence microscopy. Biological experiments with pCMS-EGFP and miRNA-15a evidenced the excellent capability of GCD@Ada-Rhod to deliver both pDNA and microRNA without significant cytotoxicity. The biological results evidenced an unforeseen caveolae-mediated endocytosis internalization pathway (generally expected for particles <200 nm), despite the fact that the GCD@Ada-Rhod size is about 400 nm (by DLS and TEM data). We supposed that the internalization pathway was driven by physical-chemical features of GCD@Ada-Rhod, and the caveolae-mediated uptake enhanced the transfection efficiency, avoiding the lysosomal acid degradation. The cellular effects of internalized miRNA-15a on the oncogene protein BCL-2 were investigated at two different concentrations (N/P = 10 and 5), and a reduction of the BCL-2 level was detected at a low concentration (i.e., N/P = 10). miRNA-15a is considered an ideal cancer therapy molecule due to its activity on multiple transcription factors, and the elucidation of the correlation between the concentration of delivered miRNA-15a and the down-/up-regulation of the BCL-2 level, documented for the first time in this work, could be an important contribution to guide its clinical application.
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Affiliation(s)
- Anna Piperno
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Antonino Mazzaglia
- CNR-ISMN c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Angela Scala
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Rosamaria Pennisi
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
- Shenzhen International Institute for Biomedical Research , Shenzhen , Guangdong 518119 , China
| | - Roberto Zagami
- CNR-ISMN c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Giulia Neri
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Serena M Torcasio
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Consolato Rosmini
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Placido G Mineo
- Department of Chemical Sciences , University of Catania , V.le A. Doria 6 , 95125 Catania , Italy
| | - Monica Potara
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research Institute in Bio-Nano-Sciences , Babes-Bolyai University , T. Laurian Str. 42 , 400271 Cluj-Napoca , Romania
| | - Monica Focsan
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research Institute in Bio-Nano-Sciences , Babes-Bolyai University , T. Laurian Str. 42 , 400271 Cluj-Napoca , Romania
| | - Simion Astilean
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research Institute in Bio-Nano-Sciences , Babes-Bolyai University , T. Laurian Str. 42 , 400271 Cluj-Napoca , Romania
- Department of Biomolecular Physics, Faculty of Physics , Babes-Bolyai University , M Kogalniceanu Str. 1 , 400084 Cluj-Napoca , Romania
| | - Grace Guoying Zhou
- Shenzhen International Institute for Biomedical Research , Shenzhen , Guangdong 518119 , China
| | - Maria Teresa Sciortino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , V.le F. Stagno d'Alcontres 31 , 98166 Messina , Italy
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20
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Caveolin-1 as a critical component in the pathogenesis of lung fibrosis of different etiology: Evidences and mechanisms. Exp Mol Pathol 2019; 111:104315. [PMID: 31629729 DOI: 10.1016/j.yexmp.2019.104315] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 07/08/2019] [Accepted: 09/29/2019] [Indexed: 12/24/2022]
Abstract
Caveolin is a structural protein of flask-shaped invaginations of the plasma membrane termed as caveolae and is widely expressed on the endothelial cells, smooth muscle cells and fibroblasts in the different parts of the body including the lung tissues. The expression of caveolin-1 in the lung tissues is important to prevent the fibrogenic actions of TGF-β1 in lung fibrosis of different etiology including idiopathic pulmonary fibrosis, systemic sclerosis-associated interstitial lung disease and allergen-induced airway remodeling. Caveolin-1-mediated internalization and degradation of TGF-β1 receptors may possibly account for the decreased actions of TGF-β1. Studies have shown that the deficiency of caveolin-1 is very important in inducing lung fibrosis and its upregulation is reported to prevent lung fibrosis. The biological actions of caveolin-1 involve signaling pathways including JNK signaling, IL-4, STAT-3, miR199a-5p, CXCR4+ and CXCL12. The present review discusses the key role of caveolin and associated signaling pathways in the pathogenesis of lung fibrosis of different etiology.
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21
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Cell Intrinsic and Extrinsic Mechanisms of Caveolin-1-Enhanced Metastasis. Biomolecules 2019; 9:biom9080314. [PMID: 31362353 PMCID: PMC6723107 DOI: 10.3390/biom9080314] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/17/2019] [Accepted: 07/25/2019] [Indexed: 12/19/2022] Open
Abstract
Caveolin-1 (CAV1) is a scaffolding protein with a controversial role in cancer. This review will initially discuss earlier studies focused on the role as a tumor suppressor before elaborating subsequently on those relating to function of the protein as a promoter of metastasis. Different mechanisms are summarized illustrating how CAV1 promotes such traits upon expression in cancer cells (intrinsic mechanisms). More recently, it has become apparent that CAV1 is also a secreted protein that can be included into exosomes where it plays a significant role in determining cargo composition. Thus, we will also discuss how CAV1 containing exosomes from metastatic cells promote malignant traits in more benign recipient cells (extrinsic mechanisms). This ability appears, at least in part, attributable to the transfer of specific cargos present due to CAV1 rather than the transfer of CAV1 itself. The evolution of how our perception of CAV1 function has changed since its discovery is summarized graphically in a time line figure.
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22
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Zhang C, Huang H, Zhang J, Wu Q, Chen X, Huang T, Li W, Liu Y, Zhang J. Caveolin-1 promotes invasion and metastasis by upregulating Pofut1 expression in mouse hepatocellular carcinoma. Cell Death Dis 2019; 10:477. [PMID: 31209283 PMCID: PMC6572835 DOI: 10.1038/s41419-019-1703-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 05/23/2019] [Accepted: 05/27/2019] [Indexed: 12/14/2022]
Abstract
Caveolin-1 (Cav-1) is an important structural protein of caveolae and plays an oncogene-like role by influencing protein glycosylation in hepatocellular carcinoma (HCC) cells. However, the mechanism by which Cav-1 promotes invasion and metastasis capacity has not been completely clarified. In this study, we demonstrate that Pofut1 is a fucosyltransferase induced by Cav-1. Mouse Hepa1-6 HCC cells lacking Cav-1 expression exhibited low transcription levels of Pofut1, whereas strong Pofut1 expression was found in high-metastasis-potential Hca-F cells with high levels of Cav-1. Cav-1 activated MAPK signaling and promoted phosphorylation of the transcription factors CREB, Sp1, HNF4A and c-Myc, which bound to the Pofut1 promoter region to induce its transcription. As Notch signaling receptors can be modified with O-fucose by Pofut1, we further showed that Cav-1-induced upregulation of Pofut1 expression activated the Notch pathway and thus enhanced invasion and metastasis by mouse HCC cells in vitro and in vivo. Collectively, our findings reveal a novel mechanism by which Cav-1 promotes tumor metastasis by upregulating expression of Pofut1, suggesting that Cav-1 may function as a new biomarker for HCC.
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Affiliation(s)
- Cheng Zhang
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China
| | - Huang Huang
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China
| | - Junshi Zhang
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China
| | - Qiong Wu
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China
| | - Xixi Chen
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China
| | - Tianmiao Huang
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China
| | - Wenli Li
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China.,School of Life Science & Biotechnology, Dalian University of Technology, Dalian, China
| | - Yubo Liu
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China.
| | - Jianing Zhang
- School of Life Science & Medicine, Dalian University of Technology, Panjin, China.
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23
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Kagawa Y, Umaru BA, Ariful I, Shil SK, Miyazaki H, Yamamoto Y, Ogata M, Owada Y. Role of FABP7 in tumor cell signaling. Adv Biol Regul 2019; 71:206-218. [PMID: 30245263 DOI: 10.1016/j.jbior.2018.09.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 09/13/2018] [Accepted: 09/13/2018] [Indexed: 06/08/2023]
Abstract
Lipids are major molecules for the function of organisms and are involved in the pathophysiology of various diseases. Fatty acids (FAs) signaling and their metabolism are some of the most important pathways in tumor development, as lipids serve as energetic sources during carcinogenesis. Fatty acid binding proteins (FABPs) facilitate FAs transport to different cell organelles, modulating their metabolism along with mediating other physiological activities. FABP7, brain-typed FABP, is thought to be an important molecule for cell proliferation in healthy as well as diseased organisms. Several studies on human tumors and tumor-derived cell lines put FABP7 in the center of tumorigenesis, and its high expression level has been reported to correlate with poor prognosis in different tumor types. Several types of FABP7-expressing tumors have shown an up-regulation of cell signaling activity, but molecular mechanisms of FABP7 involvement in tumorigenesis still remain elusive. In this review, we focus on the expression and function of FABP7 in different tumors, and possible mechanisms of FABP7 in tumor proliferation and migration.
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Affiliation(s)
- Yoshiteru Kagawa
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Banlanjo A Umaru
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Islam Ariful
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Pharmacy, University of Rajshahi, Rajshahi, Bangladesh
| | - Subrata Kumar Shil
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hirofumi Miyazaki
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yui Yamamoto
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Anatomy, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Masaki Ogata
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Anatomy, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Yuji Owada
- Department of Organ Anatomy, Tohoku University Graduate School of Medicine, Sendai, Japan.
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24
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O' Connor D, Byrne A, Keyes TE. Linker length in fluorophore–cholesterol conjugates directs phase selectivity and cellular localisation in GUVs and live cells. RSC Adv 2019; 9:22805-22816. [PMID: 35514503 PMCID: PMC9067298 DOI: 10.1039/c9ra03905h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 07/14/2019] [Indexed: 01/07/2023] Open
Abstract
Lipid membrane fluorescent probes that are both domain-selective and compatible with demanding microscopy methods are crucial to elucidate the presence and function of rafts and domains in cells and biophysical models. Whereas targeting fluorescent probes to liquid-disordered (Ld) domains is relatively facile, it is far more difficult to direct probes with high selectivity to liquid-ordered (Lo) domains. Here, a simple, one-pot approach to probe–cholesterol conjugation is described using Steglich esterification to synthesise two identical BODIPY derivatives that differ only in the length of the aliphatic chain between the dye and cholesterol. In the first, BODIPY-Ar-Chol, the probe and cholesterol were directly ester linked and in the second BODIPY-Ahx-Chol, a hexyl linker separated probe from cholesterol. Uptake and distribution of each probe was compared in ternary, phase separated giant unilamellar vesicles (GUVs) using a commercial Ld marker as a reference. BODIPY-Ar-Chol targets almost exclusively the Ld domains with selectivity of >90% whereas by contrast introducing the C6 linker between the probe and cholesterol drove the probe to Lo with excellent selectivity (>80%). The profound impact of the linker length extended also to uptake and distribution in live mammalian cells. BODIPY-Ahx-Chol associates strongly with the plasma membrane where it partitioned preferably into opposing micron dimensioned do-mains to a commercial Ld marker and its concentration at the membrane was reduced by cyclodextrin treatment of the cells. By contrast the BODIPY-Ahx-Chol permeated the membrane and localised strongly to lipid droplets within the cell. The data demonstrates the profound influence of linker length in cholesterol bioconjugates in directing the probe. By inserting a hexyl linker between a BODIPY probe and cholesterol pendant, the localization of the probe at ternary phase separated GUVs switches from Ld to Lo domains with high specificity.![]()
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Affiliation(s)
- Darragh O' Connor
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
| | - Aisling Byrne
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
| | - Tia E. Keyes
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
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25
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Kurosawa M, Oda M, Domon H, Isono T, Nakamura Y, Saitoh I, Hayasaki H, Yamaguchi M, Kawabata S, Terao Y. Streptococcus pyogenes CAMP factor promotes calcium ion uptake in RAW264.7 cells. Microbiol Immunol 2018; 62:617-623. [PMID: 30211957 DOI: 10.1111/1348-0421.12647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 08/20/2018] [Accepted: 09/04/2018] [Indexed: 12/26/2022]
Abstract
Streptococcus pyogenes is a bacterium that causes systemic diseases such as pharyngitis and toxic shock syndrome. S. pyogenes produces molecules that inhibit the function of the human immune system, thus allowing growth and spread of the pathogen in tissues. It is known that S. pyogenes CAMP factor induces vacuolation in macrophages; however, the mechanism remains unclear. In the current study, the mechanism by which CAMP factor induces vacuolation in macrophages was investigated. CAMP factor was found to induce calcium ion uptake in murine macrophage RAW264.7 cells. In addition, EDTA inhibited calcium ion uptake and vacuolation in the cells. The L-type voltage-dependent calcium ion channel blockers nifedipine and verapamil reduced vacuolation. Furthermore, the phosphoinositide 3-kinase inhibitors LY294002 and wortmannin also inhibited the vacuolation induced by CAMP factor. Fluorescent microscopy revealed that clathrin localized to the vacuoles. These results suggest that the vacuolation is related to calcium ion uptake by RAW264.7 cells via L-type voltage-dependent calcium ion channels. Therefore, it was concluded that the vacuoles induced by S. pyogenes CAMP factor in macrophages are clathrin-dependent endosomes induced by activation of the phosphoinositide 3-kinase signaling pathway through calcium ion uptake.
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Affiliation(s)
- Mie Kurosawa
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Masataka Oda
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Department of Microbiology and Infection Control Science, Kyoto Pharmaceutical University, 5 Misasagi, nakauchimachi, Yamashina-ku, Kyoto 607-8414, Japan
| | - Hisanori Domon
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Research Center for Advanced Oral Science, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Toshihito Isono
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Yuki Nakamura
- Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Issei Saitoh
- Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Haruaki Hayasaki
- Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Masaya Yamaguchi
- Department of Oral and Molecular Microbiology, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shigetada Kawabata
- Department of Oral and Molecular Microbiology, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yutaka Terao
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Research Center for Advanced Oral Science, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
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26
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Lie PPY, Nixon RA. Lysosome trafficking and signaling in health and neurodegenerative diseases. Neurobiol Dis 2018; 122:94-105. [PMID: 29859318 DOI: 10.1016/j.nbd.2018.05.015] [Citation(s) in RCA: 173] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 04/27/2018] [Accepted: 05/29/2018] [Indexed: 12/20/2022] Open
Abstract
Lysosomes, single-membrane organelles defined by a uniquely strong acidic lumenal pH and high content of acid hydrolases, are the shared degradative compartments of the endocytic and autophagic pathways. These pathways, and especially lysosomes, are points of particular vulnerability in many neurodegenerative diseases. Beyond the role of lysosomes in substrate degradation, new findings have ascribed to lysosomes the leading role in sensing and responding to cellular nutrients, growth factors and cellular stress. This review aims to integrate recent concepts of basic lysosome biology and pathobiology as a basis for understanding neurodegenerative disease pathogenesis. Here, we discuss the newly recognized signaling functions of lysosomes and specific aspects of lysosome biology in neurons while re-visiting the classical defining criteria for lysosomes and the importance of preserving strict definitions. Our discussion emphasizes dynein-mediated axonal transport of maturing degradative organelles, with further consideration of their roles in synaptic function. We finally examine how distinctive underlying disturbances of lysosomes in various neurodegenerative diseases result in unique patterns of auto/endolysosomal mistrafficking. The rapidly emerging understanding of lysosomal trafficking and disruptions in lysosome signaling is providing valuable clues to new targets for disease-modifying therapies.
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Affiliation(s)
- Pearl P Y Lie
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY 10962, USA; Department of Psychiatry, New York University Langone Medical Center, New York, NY 10016, USA.
| | - Ralph A Nixon
- Center for Dementia Research, Nathan S. Kline Institute, Orangeburg, NY 10962, USA; Department of Psychiatry, New York University Langone Medical Center, New York, NY 10016, USA; Department of Cell Biology, New York University Langone Medical Center, New York, NY 10016, USA; NYU Neuroscience Institute, New York University Langone Medical Center, New York, NY 10016, USA
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27
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Hsu SPC, Kuo JS, Chiang HC, Wang HE, Wang YS, Huang CC, Huang YC, Chi MS, Mehta MP, Chi KH. Temozolomide, sirolimus and chloroquine is a new therapeutic combination that synergizes to disrupt lysosomal function and cholesterol homeostasis in GBM cells. Oncotarget 2018; 9:6883-6896. [PMID: 29467937 PMCID: PMC5805523 DOI: 10.18632/oncotarget.23855] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 12/22/2017] [Indexed: 12/30/2022] Open
Abstract
Glioblastoma (GBM) cells are characterized by high phagocytosis, lipogenesis, exocytosis activities, low autophagy capacity and high lysosomal demand are necessary for survival and invasion. The lysosome stands at the cross roads of lipid biosynthesis, transporting, sorting between exogenous and endogenous cholesterol. We hypothesized that three already approved drugs, the autophagy inducer, sirolimus (rapamycin, Rapa), the autophagy inhibitor, chloroquine (CQ), and DNA alkylating chemotherapy, temozolomide (TMZ) could synergize against GBM. This repurposed triple therapy combination induced GBM apoptosis in vitro and inhibited GBM xenograft growth in vivo. Cytotoxicity is caused by induction of lysosomal membrane permeabilization and release of hydrolases, and may be rescued by cholesterol supplementation. Triple treatment inhibits lysosomal function, prevents cholesterol extraction from low density lipoprotein (LDL), and causes clumping of lysosome associated membrane protein-1 (LAMP-1) and lipid droplets (LD) accumulation. Co-treatment of the cell lines with inhibitor of caspases and cathepsin B only partially reverse of cytotoxicities, while N-acetyl cysteine (NAC) can be more effective. A combination of reactive oxygen species (ROS) generation from cholesterol depletion are the early event of underling mechanism. Cholesterol repletion abolished the ROS production and reversed the cytotoxicity from QRT treatment. The shortage of free cholesterol destabilizes lysosomal membranes converting aborted autophagy to apoptosis through either direct mitochondria damage or cathepsin B release. This promising anti-GBM triple therapy combination severely decreases mitochondrial function, induces lysosome-dependent apoptotic cell death, and is now poised for further clinical testing and validation.
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Affiliation(s)
- Sanford P C Hsu
- Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan.,School of Medicine, National Yang Ming University, Taipei, Taiwan
| | - John S Kuo
- Department of Neurological Surgery, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | | | - Hsin-Ell Wang
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
| | | | | | | | - Mau-Shin Chi
- Department of Radiation Therapy and Oncology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
| | | | - Kwan-Hwa Chi
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan.,Miami Cancer Institute, Miami, FL, USA
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28
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Vanhecke D, Kuhn DA, Jimenez de Aberasturi D, Balog S, Milosevic A, Urban D, Peckys D, de Jonge N, Parak WJ, Petri-Fink A, Rothen-Rutishauser B. Involvement of two uptake mechanisms of gold and iron oxide nanoparticles in a co-exposure scenario using mouse macrophages. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:2396-2409. [PMID: 29234575 PMCID: PMC5704759 DOI: 10.3762/bjnano.8.239] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 10/11/2017] [Indexed: 05/26/2023]
Abstract
Little is known about the simultaneous uptake of different engineered nanoparticle types, as it can be expected in our daily life. In order to test such co-exposure effects, murine macrophages (J774A.1 cell line) were incubated with gold (AuNPs) and iron oxide nanoparticles (FeO x NPs) either alone or combined. Environmental scanning electron microscopy revealed that single NPs of both types bound within minutes on the cell surface but with a distinctive difference between FeO x NPs and AuNPs. Uptake analysis studies based on laser scanning microscopy, transmission electron microscopy, and inductively coupled plasma optical emission spectrometry revealed intracellular appearance of both NP types in all exposure scenarios and a time-dependent increase. This increase was higher for both AuNPs and FeO x NPs during co-exposure. Cells treated with endocytotic inhibitors recovered after co-exposure, which additionally hinted that two uptake mechanisms are involved. Cross-talk between uptake pathways is relevant for toxicological studies: Co-exposure acts as an uptake accelerant. If the goal is to maximize the cellular uptake, e.g., for the delivery of pharmaceutical agents, this can be beneficial. However, co-exposure should also be taken into account in the case of risk assessment of occupational settings. The demonstration of co-exposure-invoked pathway interactions reveals that synergetic nanoparticle effects, either positive or negative, must be considered for nanotechnology and nanomedicine in particular to develop to its full potential.
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Affiliation(s)
- Dimitri Vanhecke
- Adolphe Merkle Institute, Université de Fribourg, Chemin des Verdiers 4, CH 1700, Fribourg, Switzerland
| | - Dagmar A Kuhn
- Adolphe Merkle Institute, Université de Fribourg, Chemin des Verdiers 4, CH 1700, Fribourg, Switzerland
| | | | - Sandor Balog
- Adolphe Merkle Institute, Université de Fribourg, Chemin des Verdiers 4, CH 1700, Fribourg, Switzerland
| | - Ana Milosevic
- Adolphe Merkle Institute, Université de Fribourg, Chemin des Verdiers 4, CH 1700, Fribourg, Switzerland
| | - Dominic Urban
- Adolphe Merkle Institute, Université de Fribourg, Chemin des Verdiers 4, CH 1700, Fribourg, Switzerland
| | - Diana Peckys
- Department of Biophysics, CIPMM Geb. 48, Saarland University, 66421 Homburg/Saar, Germany
| | - Niels de Jonge
- Department of Biophysics, CIPMM Geb. 48, Saarland University, 66421 Homburg/Saar, Germany
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Wolfgang J Parak
- CIC Biomagune, Miramon Ibilbidea 182, 20014 Donostia, Gipuzkoa, San Sebastian, Spain
- Fachbereich Physik, Philipps Universität Marburg, Renthof 7, 35037 Marburg, Germany
| | - Alke Petri-Fink
- Adolphe Merkle Institute, Université de Fribourg, Chemin des Verdiers 4, CH 1700, Fribourg, Switzerland
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Sharshiner R, Brace RA, Cheung CY. Vesicular uptake of macromolecules by human placental amniotic epithelial cells. Placenta 2017; 57:137-143. [PMID: 28864003 DOI: 10.1016/j.placenta.2017.06.344] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 05/28/2017] [Accepted: 06/30/2017] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Studies in animal models have shown that unidirectional vesicular transport of amniotic fluid across the amnion plays a primary role in regulating amniotic fluid volume. Our objective was to explore vesicle type, vesicular uptake and intracellular distribution of vesicles in human amnion cells using high- and super-resolution fluorescence microscopy. METHODS Placental amnion was obtained at cesarean section and amnion cells were prepared and cultured. At 20%-50% confluence, the cells were incubated with fluorophore conjugated macromolecules for 1-30 min at 22 °C or 37 °C. Fluorophore labeled macromolecules were selected as markers of receptor-mediated caveolar and clathrin-coated vesicular uptake as well as non-specific endocytosis. After fluorophore treatment, the cells were fixed, imaged and vesicles counted using Imaris® software. RESULTS Vesicular uptake displayed first order saturation kinetics with half saturation times averaging 1.3 min at 37 °C compared to 4.9 min at 22 °C, with non-specific endocytotic uptake being more rapid at both temperatures. There was extensive cell-to-cell variability in uptake rate. Under super-resolution microscopy, the pattern of intracellular spatial distribution was distinct for each macromolecule. Co-localization of fluorescently labeled macromolecules was very low at vesicular dimensions. CONCLUSIONS In human placental amnion cells, 1) vesicular uptake of macromolecules is rapid, consistent with the concept that vesicular transcytosis across the amnion plays a role in the regulation of amniotic fluid volume; 2) uptake is temperature dependent and variable among individual cells; 3) the unique intracellular distributions suggest distinct functions for each vesicle type; 4) non-receptor mediated vesicular uptake may be a primary vesicular uptake mechanism.
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Affiliation(s)
- Rita Sharshiner
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Oregon Health and Science University, Portland, OR, USA.
| | - Robert A Brace
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Oregon Health and Science University, Portland, OR, USA; Center for Developmental Health, Oregon Health and Science University, Portland, OR, USA.
| | - Cecilia Y Cheung
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Oregon Health and Science University, Portland, OR, USA; Center for Developmental Health, Oregon Health and Science University, Portland, OR, USA.
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30
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Lee CY, Lai TY, Tsai MK, Chang YC, Ho YH, Yu IS, Yeh TW, Chou CC, Lin YS, Lawrence T, Hsu LC. The ubiquitin ligase ZNRF1 promotes caveolin-1 ubiquitination and degradation to modulate inflammation. Nat Commun 2017; 8:15502. [PMID: 28593998 PMCID: PMC5472178 DOI: 10.1038/ncomms15502] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 04/05/2017] [Indexed: 02/07/2023] Open
Abstract
Caveolin-1 (CAV1), the major constituent of caveolae, plays a pivotal role in various cellular biological functions, including cancer and inflammation. The ubiquitin/proteasomal pathway is known to contribute to the regulation of CAV1 expression, but the ubiquitin ligase responsible for CAV1 protein stability remains unidentified. Here we reveal that E3 ubiquitin ligase ZNRF1 modulates CAV1 protein stability to regulate Toll-like receptor (TLR) 4-triggered immune responses. We demonstrate that ZNRF1 physically interacts with CAV1 in response to lipopolysaccharide and mediates ubiquitination and degradation of CAV1. The ZNRF1-CAV1 axis regulates Akt-GSK3β activity upon TLR4 activation, resulting in enhanced production of pro-inflammatory cytokines and inhibition of anti-inflammatory cytokine IL-10. Mice with deletion of ZNRF1 in their hematopoietic cells display increased resistance to endotoxic and polymicrobial septic shock due to attenuated inflammation. Our study defines ZNRF1 as a regulator of TLR4-induced inflammatory responses and reveals another mechanism for the regulation of TLR4 signalling through CAV1.
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Affiliation(s)
- Chih-Yuan Lee
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
- Department of Surgery, National Taiwan University Hospital, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Ting-Yu Lai
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Meng-Kun Tsai
- Department of Surgery, National Taiwan University Hospital, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Yung-Chi Chang
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Yu-Hsin Ho
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - I-Shing Yu
- Laboratory Animal Center, College of Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Tzu-Wen Yeh
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Chih-Chang Chou
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - You-Sheng Lin
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
| | - Toby Lawrence
- Institut National de la Santé et de la Recherche Médicale (INSERM), U1104, 13288 Marseille, France
| | - Li-Chung Hsu
- Institute of Molecular Medicine, National Taiwan University, No. 7 Chung San South Road, Taipei 10002, Taiwan
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31
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Couto NF, Pedersane D, Rezende L, Dias PP, Corbani TL, Bentini LC, Oliveira ACS, Kelles LF, Castro-Gomes T, Andrade LO. LAMP-2 absence interferes with plasma membrane repair and decreases T. cruzi host cell invasion. PLoS Negl Trop Dis 2017; 11:e0005657. [PMID: 28586379 PMCID: PMC5473579 DOI: 10.1371/journal.pntd.0005657] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 06/16/2017] [Accepted: 05/22/2017] [Indexed: 12/18/2022] Open
Abstract
Trypanosoma cruzi enters host cells by subverting the mechanism of cell membrane repair. In this process, the parasite induces small injuries in the host cell membrane leading to calcium entry and lysosomal exocytosis, which are followed by compensatory endocytosis events that drive parasites into host cells. We have previously shown that absence of both LAMP-1 and 2, major components of lysosomal membranes, decreases invasion of T. cruzi into host cells, but the mechanism by which they interfere with parasite invasion has not been described. Here we investigated the role of these proteins in parasitophorous vacuole morphology, host cell lysosomal exocytosis, and membrane repair ability. First, we showed that cells lacking only LAMP-2 present the same invasion phenotype as LAMP1/2-/- cells, indicating that LAMP-2 is an important player during T. cruzi invasion process. Second, neither vacuole morphology nor lysosomal exocytosis was altered in LAMP-2 lacking cells (LAMP2-/- and LAMP1/2-/- cells). We then investigated the ability of LAMP-2 deficient cells to perform compensatory endocytosis upon lysosomal secretion, the mechanism by which cells repair their membrane and T. cruzi ultimately enters cells. We observed that these cells perform less endocytosis upon injury when compared to WT cells. This was a consequence of impaired cholesterol traffic in cells lacking LAMP-2 and its influence in the distribution of caveolin-1 at the cell plasma membrane, which is crucial for plasma membrane repair. The results presented here show the major role of LAMP-2 in caveolin traffic and membrane repair and consequently in T. cruzi invasion.
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Affiliation(s)
| | - Dina Pedersane
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Luisa Rezende
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Patrícia P. Dias
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Tayanne L. Corbani
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Lívia C. Bentini
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Anny C. S. Oliveira
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Ludmila F. Kelles
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Thiago Castro-Gomes
- Department of Biochemistry and Immunology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Luciana O. Andrade
- Department of Morphology/Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
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32
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Schulze U, Vollenbröker B, Kühnl A, Granado D, Bayraktar S, Rescher U, Pavenstädt H, Weide T. Cellular vacuolization caused by overexpression of the PIKfyve-binding deficient Vac14L156R is rescued by starvation and inhibition of vacuolar-ATPase. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:749-759. [DOI: 10.1016/j.bbamcr.2017.02.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 02/09/2017] [Accepted: 02/15/2017] [Indexed: 12/28/2022]
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Berger H, Breuer M, Peradziryi H, Podleschny M, Jacob R, Borchers A. PTK7 localization and protein stability is affected by canonical Wnt ligands. J Cell Sci 2017; 130:1890-1903. [PMID: 28420671 DOI: 10.1242/jcs.198580] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 04/07/2017] [Indexed: 01/03/2023] Open
Abstract
Protein tyrosine kinase 7 (PTK7) is an evolutionarily conserved transmembrane receptor with important roles in embryonic development and disease. Originally identified as a gene upregulated in colon cancer, it was later shown to regulate planar cell polarity (PCP) and directional cell movement. PTK7 is a Wnt co-receptor; however, its role in Wnt signaling remains controversial. Here, we find evidence that places PTK7 at the intersection of canonical and non-canonical Wnt signaling pathways. In presence of canonical Wnt ligands PTK7 is subject to caveolin-mediated endocytosis, while it is unaffected by non-canonical Wnt ligands. PTK7 endocytosis is dependent on the presence of the PTK7 co-receptor Fz7 (also known as Fzd7) and results in lysosomal degradation of PTK7. As we previously observed that PTK7 activates non-canonical PCP Wnt signaling but inhibits canonical Wnt signaling, our data suggest a mutual inhibition of canonical and PTK7 Wnt signaling. PTK7 likely suppresses canonical Wnt signaling by binding canonical Wnt ligands thereby preventing their interaction with Wnt receptors that would otherwise support canonical Wnt signaling. Conversely, if canonical Wnt proteins interact with the PTK7 receptor, they induce its internalization and degradation.
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Affiliation(s)
- Hanna Berger
- Department of Biology, Molecular Embryology, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Marlen Breuer
- Department of Biology, Molecular Embryology, Philipps-Universität Marburg, Marburg 35043, Germany.,DFG Research Training Group, Membrane Plasticity in Tissue Development and Remodeling, GRK 2213, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Hanna Peradziryi
- Institute for Clinical Research, Georg-August Universität Göttingen, Göttingen 37075, Germany
| | - Martina Podleschny
- Department of Biology, Molecular Embryology, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Ralf Jacob
- Department of Cell Biology and Cell Pathology, Philipps-Universität Marburg, Marburg 35037, Germany.,DFG Research Training Group, Membrane Plasticity in Tissue Development and Remodeling, GRK 2213, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Annette Borchers
- Department of Biology, Molecular Embryology, Philipps-Universität Marburg, Marburg 35043, Germany .,DFG Research Training Group, Membrane Plasticity in Tissue Development and Remodeling, GRK 2213, Philipps-Universität Marburg, Marburg 35043, Germany
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34
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Busija AR, Patel HH, Insel PA. Caveolins and cavins in the trafficking, maturation, and degradation of caveolae: implications for cell physiology. Am J Physiol Cell Physiol 2017; 312:C459-C477. [PMID: 28122734 DOI: 10.1152/ajpcell.00355.2016] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 01/23/2017] [Accepted: 01/24/2017] [Indexed: 01/09/2023]
Abstract
Caveolins (Cavs) are ~20 kDa scaffolding proteins that assemble as oligomeric complexes in lipid raft domains to form caveolae, flask-shaped plasma membrane (PM) invaginations. Caveolae ("little caves") require lipid-lipid, protein-lipid, and protein-protein interactions that can modulate the localization, conformational stability, ligand affinity, effector specificity, and other functions of proteins that are partners of Cavs. Cavs are assembled into small oligomers in the endoplasmic reticulum (ER), transported to the Golgi for assembly with cholesterol and other oligomers, and then exported to the PM as an intact coat complex. At the PM, cavins, ~50 kDa adapter proteins, oligomerize into an outer coat complex that remodels the membrane into caveolae. The structure of caveolae protects their contents (i.e., lipids and proteins) from degradation. Cellular changes, including signal transduction effects, can destabilize caveolae and produce cavin dissociation, restructuring of Cav oligomers, ubiquitination, internalization, and degradation. In this review, we provide a perspective of the life cycle (biogenesis, degradation), composition, and physiologic roles of Cavs and caveolae and identify unanswered questions regarding the roles of Cavs and cavins in caveolae and in regulating cell physiology.1.
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Affiliation(s)
- Anna R Busija
- Department of Anesthesiology, University of California, San Diego, La Jolla, California.,Department of Pharmacology, University of California, San Diego, La Jolla, California
| | - Hemal H Patel
- Department of Anesthesiology, University of California, San Diego, La Jolla, California
| | - Paul A Insel
- Department of Medicine, University of California, San Diego, La Jolla, California; and .,Department of Pharmacology, University of California, San Diego, La Jolla, California
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35
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Li Z, Sun L, Zhang Y, Dove AP, O’Reilly RK, Chen G. Shape Effect of Glyco-Nanoparticles on Macrophage Cellular Uptake and Immune Response. ACS Macro Lett 2016; 5:1059-1064. [PMID: 27695648 PMCID: PMC5038960 DOI: 10.1021/acsmacrolett.6b00419] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 08/29/2016] [Indexed: 11/29/2022]
Abstract
The shells of various poly(dl-lactide)-b-poly(acrylic acid) (PDLLA-b-PAA) spherical micelles and poly(l-lactide)-b-poly(acrylic acid) (PLLA-b-PAA) cylindrical micelles were functionalized with mannose to yield glyco-nanoparticles (GNPs) with different shapes and dimensions. All of these GNPs were shown to have good biocompatibility (up to 1 mg/mL). Cellular uptake experiments using RAW 264.7 have shown that the spherical GNPs were internalized to a much greater extent than the cylindrical GNPs and such a phenomenon was attributed to their different endocytosis pathways. It was demonstrated that spherical GNPs were internalized based on clathrin- and caveolin-mediated endocytosis while cylindrical GNPs mainly depended on clathrin-mediated endocytosis. We also found that longer cylindrical GNPs (Ln × Wn = 215 × 47 nm) can induce an inflammatory response (specifically interleukin 6) more efficiently than shorter cylindrical GNPs (Ln × Wn = 99 × 50 nm) and spherical GNPs (Dn = 46 nm).
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Affiliation(s)
- Zhen Li
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai, 200433 China
| | - Liang Sun
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Yufei Zhang
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai, 200433 China
| | - Andrew P. Dove
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Rachel K. O’Reilly
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Guosong Chen
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai, 200433 China
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36
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Boothe T, Lim GE, Cen H, Skovsø S, Piske M, Li SN, Nabi IR, Gilon P, Johnson JD. Inter-domain tagging implicates caveolin-1 in insulin receptor trafficking and Erk signaling bias in pancreatic beta-cells. Mol Metab 2016; 5:366-378. [PMID: 27110488 PMCID: PMC4837300 DOI: 10.1016/j.molmet.2016.01.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Revised: 01/18/2016] [Accepted: 01/25/2016] [Indexed: 01/04/2023] Open
Abstract
OBJECTIVE The role and mechanisms of insulin receptor internalization remain incompletely understood. Previous trafficking studies of insulin receptors involved fluorescent protein tagging at their termini, manipulations that may be expected to result in dysfunctional receptors. Our objective was to determine the trafficking route and molecular mechanisms of functional tagged insulin receptors and endogenous insulin receptors in pancreatic beta-cells. METHODS We generated functional insulin receptors tagged with pH-resistant fluorescent proteins between domains. Confocal, TIRF and STED imaging revealed a trafficking pattern of inter-domain tagged insulin receptors and endogenous insulin receptors detected with antibodies. RESULTS Surprisingly, interdomain-tagged and endogenous insulin receptors in beta-cells bypassed classical Rab5a- or Rab7-mediated endocytic routes. Instead, we found that removal of insulin receptors from the plasma membrane involved tyrosine-phosphorylated caveolin-1, prior to trafficking within flotillin-1-positive structures to lysosomes. Multiple methods of inhibiting caveolin-1 significantly reduced Erk activation in vitro or in vivo, while leaving Akt signaling mostly intact. CONCLUSIONS We conclude that phosphorylated caveolin-1 plays a role in insulin receptor internalization towards lysosomes through flotillin-1-positive structures and that caveolin-1 helps bias physiological beta-cell insulin signaling towards Erk activation.
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Affiliation(s)
- Tobias Boothe
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Gareth E Lim
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Haoning Cen
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Søs Skovsø
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Micah Piske
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Shu Nan Li
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Ivan R Nabi
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Patrick Gilon
- Pôle d'endocrinologie, diabète et nutrition, Institut de recherche expérimentale et clinique, Université catholique de Louvain, Brussels, Belgium
| | - James D Johnson
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada.
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Shi Y, Tan SH, Ng S, Zhou J, Yang ND, Koo GB, McMahon KA, Parton RG, Hill MM, Del Pozo MA, Kim YS, Shen HM. Critical role of CAV1/caveolin-1 in cell stress responses in human breast cancer cells via modulation of lysosomal function and autophagy. Autophagy 2016; 11:769-84. [PMID: 25945613 DOI: 10.1080/15548627.2015.1034411] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
CAV1 (caveolin 1, caveolae protein, 22kDa) is well known as a principal scaffolding protein of caveolae, a specialized plasma membrane structure. Relatively, the caveolae-independent function of CAV1 is less studied. Autophagy is a process known to involve various membrane structures, including autophagosomes, lysosomes, and autolysosomes for degradation of intracellular proteins and organelles. Currently, the function of CAV1 in autophagy remains largely elusive. In this study, we demonstrate for the first time that CAV1 deficiency promotes both basal and inducible autophagy. Interestingly, the promoting effect was found mainly in the late stage of autophagy via enhancing lysosomal function and autophagosome-lysosome fusion. Notably, the regulatory function of CAV1 in lysosome and autophagy was found to be caveolae-independent, and acts through lipid rafts. Furthermore, the elevated autophagy level induced by CAV1 deficiency serves as a cell survival mechanism under starvation. Importantly, downregulation of CAV1 and enhanced autophagy level were observed in human breast cancer cells and tissues. Taken together, our data reveal a novel function of CAV1 and lipid rafts in breast cancer development via modulation of lysosomal function and autophagy.
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Key Words
- ATP6V0D1, ATPase H+ transporting lysosomal 38kDa, V0 subunit d1
- Baf, bafilomycin A1
- CAV1, caveolin 1
- CHO, water-soluble cholesterol
- CQ, choloroquine
- CTSL, cathepsin L
- CTxB, cholera toxin subunit B
- DRF, detergent-resistant fraction
- DSF, detergent-soluble fraction
- EGF, epidermal growth factor
- KO, knockout
- LAMP1, lysosomal-associated membrane protein 1
- MAP1LC3/LC3, microtubule-associated protein 1 light chain 3
- MBCD, methyl-β-cyclodextrin
- MEF, mouse embryonic fibroblasts
- MTOR, mechanistic target of rapamycin
- PBS, phosphate-buffered saline
- PI, propidium iodide
- PLA, proximity ligation assay
- PTRF, polymerase I and transcript release factor
- TFRC, transferrin receptor
- TSC, tuberous sclerosis complex
- WT, wild type.
- autophagy
- breast cancer
- caveolin 1
- lipid rafts
- lysosome
- tfLC3B, mRFP-GFP tandem fluorescent-tagged LC3B
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Affiliation(s)
- Yin Shi
- a Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore ; Singapore
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Sethna S, Chamakkala T, Gu X, Thompson TC, Cao G, Elliott MH, Finnemann SC. Regulation of Phagolysosomal Digestion by Caveolin-1 of the Retinal Pigment Epithelium Is Essential for Vision. J Biol Chem 2016; 291:6494-506. [PMID: 26814131 DOI: 10.1074/jbc.m115.687004] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Indexed: 01/09/2023] Open
Abstract
Caveolin-1 associates with the endo/lysosomal machinery of cells in culture, suggesting that it functions at these organelles independently of its contribution to cell surface caveolae. Here we explored mice lacking caveolin-1 specifically in the retinal pigment epithelium (RPE). The RPE supports neighboring photoreceptors via diurnal phagocytosis of spent photoreceptor outer segment fragments. Like mice lacking caveolin-1 globally, (RPE)CAV1(-/-) mice developed a normal RPE and neural retina but showed reduced rod photoreceptor light responses, indicating that lack of caveolin-1 affects photoreceptor function in a non-cell-autonomous manner. (RPE)CAV1(-/-) RPE in situ showed normal particle engulfment but delayed phagosome clearance and reversed diurnal profiles of levels and activities of lysosomal enzymes. Therefore, eliminating caveolin-1 specifically impairs phagolysosomal degradation by the RPE in vivo. Endogenous caveolin-1 was recruited to maturing phagolysosomes in RPE cells in culture. Consistent with these in vivo data, a moderate increase (to ∼ 2.5-fold) or decrease (by half) of caveolin-1 protein levels in RPE cells in culture was sufficient to accelerate or impair phagolysosomal digestion, respectively. A mutant form of caveolin-1 that fails to reach the cell surface augmented degradation like wild-type caveolin-1. Acidic lysosomal pH and increased protease activity are essential for digestion. We show that halving caveolin-1 protein levels significantly alkalinized lysosomal pH and decreased lysosomal enzyme activities. Taken together, our results reveal a novel role for intracellular caveolin-1 in modulating phagolysosomal function. Moreover, they show, for the first time, that organellar caveolin-1 significantly affects tissue functionality in vivo.
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Affiliation(s)
- Saumil Sethna
- From the Department of Biological Sciences, Center for Cancer Genetic Diseases and Gene Regulation, Fordham University, Bronx, New York 10458
| | - Tess Chamakkala
- From the Department of Biological Sciences, Center for Cancer Genetic Diseases and Gene Regulation, Fordham University, Bronx, New York 10458
| | - Xiaowu Gu
- the Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, and
| | - Timothy C Thompson
- the Department of Genitourinary Medical Oncology, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030
| | - Guangwen Cao
- the Department of Genitourinary Medical Oncology, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030
| | - Michael H Elliott
- the Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, and
| | - Silvia C Finnemann
- From the Department of Biological Sciences, Center for Cancer Genetic Diseases and Gene Regulation, Fordham University, Bronx, New York 10458,
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Martins IJ. Overnutrition Determines LPS Regulation of Mycotoxin Induced Neurotoxicity in Neurodegenerative Diseases. Int J Mol Sci 2015; 16:29554-73. [PMID: 26690419 PMCID: PMC4691133 DOI: 10.3390/ijms161226190] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 11/19/2015] [Accepted: 12/01/2015] [Indexed: 12/11/2022] Open
Abstract
Chronic neurodegenerative diseases are now associated with obesity and diabetes and linked to the developing and developed world. Interests in healthy diets have escalated that may prevent neurodegenerative diseases such as Parkinson's and Alzheimer's disease. The global metabolic syndrome involves lipoprotein abnormalities and insulin resistance and is the major disorder for induction of neurological disease. The effects of bacterial lipopolysaccharides (LPS) on dyslipidemia and NAFLD indicate that the clearance and metabolism of fungal mycotoxins are linked to hypercholesterolemia and amyloid beta oligomers. LPS and mycotoxins are associated with membrane lipid disturbances with effects on cholesterol interacting proteins, lipoprotein metabolism, and membrane apo E/amyloid beta interactions relevant to hypercholesterolemia with close connections to neurological diseases. The influence of diet on mycotoxin metabolism has accelerated with the close association between mycotoxin contamination from agricultural products such as apple juice, grains, alcohol, and coffee. Cholesterol efflux in lipoproteins and membrane cholesterol are determined by LPS with involvement of mycotoxin on amyloid beta metabolism. Nutritional interventions such as diets low in fat/carbohydrate/cholesterol have become of interest with relevance to low absorption of lipophilic LPS and mycotoxin into lipoproteins with rapid metabolism of mycotoxin to the liver with the prevention of neurodegeneration.
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Affiliation(s)
- Ian James Martins
- Centre of Excellence in Alzheimer's Disease Research and Care, School of Medical Sciences, Edith Cowan University, 270 Joondalup Drive, Joondalup 6027, Australia.
- School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Nedlands 6009, Australia.
- McCusker Alzheimer's Research Foundation, Hollywood Medical Centre, 85 Monash Avenue, Suite 22, Nedlands 6009, Australia.
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40
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Cheng JPX, Nichols BJ. Caveolae: One Function or Many? Trends Cell Biol 2015; 26:177-189. [PMID: 26653791 DOI: 10.1016/j.tcb.2015.10.010] [Citation(s) in RCA: 176] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 10/16/2015] [Accepted: 10/22/2015] [Indexed: 02/07/2023]
Abstract
Caveolae are small, bulb-shaped plasma membrane invaginations. Mutations that ablate caveolae lead to diverse phenotypes in mice and humans, making it challenging to uncover their molecular mechanisms. Caveolae have been described to function in endocytosis and transcytosis (a specialized form of endocytosis) and in maintaining membrane lipid composition, as well as acting as signaling platforms. New data also support a model in which the central function of caveolae could be related to the protection of cells from mechanical stress within the plasma membrane. We present evidence for these diverse roles and consider in vitro and in vivo experiments confirming a mechanoprotective role. We conclude by highlighting current gaps in our knowledge of how mechanical signals may be transduced by caveolae.
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Affiliation(s)
- Jade P X Cheng
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
| | - Benjamin J Nichols
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
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Nitric Oxide Interacts with Caveolin-1 to Facilitate Autophagy-Lysosome-Mediated Claudin-5 Degradation in Oxygen-Glucose Deprivation-Treated Endothelial Cells. Mol Neurobiol 2015; 53:5935-5947. [PMID: 26515186 DOI: 10.1007/s12035-015-9504-8] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 10/19/2015] [Indexed: 01/07/2023]
Abstract
Using in vitro oxygen-glucose deprivation (OGD) model, we have previously demonstrated that 2-h OGD induces rapid, caveolin-1-mediated dissociation of claudin-5 from the cellular cytoskeletal framework and quick endothelial barrier disruption. In this study, we further investigated the fate of translocated claudin-5 and the mechanisms by which OGD promotes caveolin-1 translocation. Exposure of bEND3 cells to 4-h OGD, but not 2-h OGD plus 2-h reoxygenation, resulted in claudin-5 degradation. Inhibition of autophagy or the fusion of autophagosome with lysosome, but not proteasome, blocked OGD-induced claudin-5 degradation. Moreover, knockdown of caveolin-1 with siRNA blocked OGD-induced claudin-5 degradation. Western blot analysis showed a transient colocalization of caveolin-1, claudin-5, and LC3B in autolysosome or lipid raft fractions at 2-h OGD. Of note, inhibiting autophagosome and lysosome fusion sustained the colocalization of caveolin-1, claudin-5, and LC3B throughout the 4-h OGD exposure. EPR spin trapping showed increased nitric oxide (NO) generation in 2-h OGD-treated cells, and inhibiting NO with its scavenger C-PTIO or inducible nitric oxide synthase (iNOS) inhibitor 1400W prevented OGD-induced caveolin-1 translocation and claudin-5 degradation. Taken together, our data provide a novel mechanism underlying endothelial barrier disruption under prolonged ischemic conditions, in which NO promotes caveolin-1-mediated delivery of claudin-5 to the autophagosome for autophagy-lysosome-dependent degradation.
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Determination of cell uptake pathways for tumor inhibitor lysyl oxidase propeptide. Mol Oncol 2015; 10:1-23. [PMID: 26297052 DOI: 10.1016/j.molonc.2015.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Revised: 07/24/2015] [Accepted: 07/27/2015] [Indexed: 01/13/2023] Open
Abstract
The lysyl oxidase propeptide (LOX-PP) is derived from pro-lysyl oxidase (Pro-LOX) by extracellular biosynthetic proteolysis. LOX-PP inhibits breast and prostate cancer xenograft tumor growth and has tumor suppressor activity. Although, several intracellular targets and molecular mechanisms of action of LOX-PP have been identified, LOX-PP uptake pathways have not been reported. Here we demonstrate that the major uptake pathway for recombinant LOX-PP (rLOX-PP) is PI3K-dependent macropinocytosis in PWR-1E, PC3, SCC9, MDA-MB-231 cell lines. A secondary pathway appears to be dynamin- and caveola dependent. The ionic properties of highly basic rLOX-PP provide buffering capacity at both high and low pHs. We suggest that the buffering capacity of rLOX-PP, which serves to limit endosomal acidification, sustains PI3K-dependent macropinocytosis in endosomes which in turn is likely to facilitate LOX-PP endosomal escape into the cytoplasm and its observed interactions with cytoplasmic targets and nuclear uptake.
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Keswani RK, Lazebnik M, Pack DW. Intracellular trafficking of hybrid gene delivery vectors. J Control Release 2015; 207:120-30. [PMID: 25883029 DOI: 10.1016/j.jconrel.2015.04.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 04/10/2015] [Accepted: 04/11/2015] [Indexed: 10/23/2022]
Abstract
Viral and non-viral gene delivery vectors are in development for human gene therapy, but both exhibit disadvantages such as inadequate efficiency, lack of cell-specific targeting or safety concerns. We have recently reported the design of hybrid delivery vectors combining retrovirus-like particles with synthetic polymers or lipids that are efficient, provide sustained gene expression and are more stable compared to native retroviruses. To guide further development of this promising class of gene delivery vectors, we have investigated their mechanisms of intracellular trafficking. Moloney murine leukemia virus-like particles (M-VLPs) were complexed with chitosan (Chi) or liposomes (Lip) comprising DOTAP, DOPE and cholesterol to form the hybrid vectors (Chi/M-VLPs and Lip/M-VLPs, respectively). Transfection efficiency and cellular internalization of the vectors were quantified in the presence of a panel of inhibitors of various endocytic pathways. Intracellular transport and trafficking kinetics of the hybrid vectors were dependent on the synthetic component and used a combination of clathrin- and caveolar-dependent endocytosis and macropinocytosis. Chi/M-VLPs were slower to transfect compared to Lip/M-VLPs due to the delayed detachment of the synthetic component. The synthetic component of hybrid gene delivery vectors plays a significant role in their cellular interactions and processing and is a key parameter for the design of more efficient gene delivery vehicles.
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Affiliation(s)
- Rahul K Keswani
- Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL 61801, USA
| | - Mihael Lazebnik
- Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL 61801, USA
| | - Daniel W Pack
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA; Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40506, USA.
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Kagawa Y, Yasumoto Y, Sharifi K, Ebrahimi M, Islam A, Miyazaki H, Yamamoto Y, Sawada T, Kishi H, Kobayashi S, Maekawa M, Yoshikawa T, Takaki E, Nakai A, Kogo H, Fujimoto T, Owada Y. Fatty acid-binding protein 7 regulates function of caveolae in astrocytes through expression of caveolin-1. Glia 2015; 63:780-94. [PMID: 25601031 DOI: 10.1002/glia.22784] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 12/16/2014] [Indexed: 12/28/2022]
Abstract
Fatty acid-binding proteins (FABPs) bind and solubilize long-chain fatty acids, controlling intracellular lipid dynamics. FABP7 is expressed by astrocytes in the developing brain, and suggested to be involved in the control of astrocyte lipid homeostasis. In this study, we sought to examine the role of FABP7 in astrocytes, focusing on plasma membrane lipid raft function, which is important for receptor-mediated signal transduction in response to extracellular stimuli. In FABP7-knockout (KO) astrocytes, the ligand-dependent accumulation of Toll-like receptor 4 (TLR4) and glial cell-line-derived neurotrophic factor receptor alpha 1 into lipid raft was decreased, and the activation of mitogen-activated protein kinases and nuclear factor-κB was impaired after lipopolysaccharide (LPS) stimulation when compared with wild-type astrocytes. In addition, the expression of caveolin-1, not cavin-1, 2, 3, caveolin-2, and flotillin-1, was found to be decreased at the protein and transcriptional levels. FABP7 re-expression in FABP7-KO astrocytes rescued the decreased level of caveolin-1. Furthermore, caveolin-1-transfection into FABP7-KO astrocytes significantly increased TLR4 recruitment into lipid raft and tumor necrosis factor-α production after LPS stimulation. Taken together, these data suggest that FABP7 controls lipid raft function through the regulation of caveolin-1 expression and is involved in the response of astrocytes to the external stimuli. GLIA 2015;63:780-794.
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Affiliation(s)
- Yoshiteru Kagawa
- Department of Organ Anatomy, Yamaguchi University Graduate School of Medicine, Ube, Japan
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Major histocompatibility complex class I downregulation induced by equine herpesvirus type 1 pUL56 is through dynamin-dependent endocytosis. J Virol 2014; 88:12802-15. [PMID: 25165105 DOI: 10.1128/jvi.02079-14] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
UNLABELLED Equine herpesvirus type 1 (EHV-1) downregulates cell surface expression of major histocompatibility complex class I (MHC-I) in infected cells. We have previously shown that pUL56 encoded by the EHV-1 ORF1 gene regulates the process (G. Ma, S. Feineis, N. Osterrieder, and G. R. Van de Walle, J. Virol. 86:3554-3563, 2012, doi:http://dx.doi.org/10.1128/JVI.06994-11). Here, we report that cell surface MHC-I in EHV-1-infected cells is internalized and degraded in the lysosomal compartment in a pUL56-dependent fashion. pUL56-induced MHC-I endocytosis required dynamin and tyrosine kinase but was independent of clathrin and caveolin-1, the main constituents of the clathrin- and raft/caveola-mediated endocytosis pathways, respectively. Downregulation of cell surface MHC-I was significantly inhibited by the ubiquitin-activating enzyme E1 inhibitor PYR41, indicating that ubiquitination is essential for the process. Finally, we show that downregulation is not specific for MHC-I and that other molecules, including CD46 and CD63, are also removed from the cell surface in a pUL56-dependent fashion. IMPORTANCE We show that alphaherpesvirus induces MHC-I downregulation through endocytosis, which is mediated by pUL56. The dynamin-dependent endocytic pathway is responsible for MHC-I internalization in infected cells. Furthermore, we discovered that this endocytic process can be disrupted by the inhibiting ubiquitin-activating E1 enzyme, which is indispensable for ubiquitination. Finally, pUL56 action extends to a number of cell surface molecules that are significant for host immunity. Therefore, the protein may exert a more general immunomodulatory effect.
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46
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Eltoukhy AA, Sahay G, Cunningham JM, Anderson DG. Niemann-Pick C1 affects the gene delivery efficacy of degradable polymeric nanoparticles. ACS NANO 2014; 8:7905-13. [PMID: 25010491 PMCID: PMC4148171 DOI: 10.1021/nn501630h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 07/10/2014] [Indexed: 05/15/2023]
Abstract
Despite intensive research effort, the rational design of improved nanoparticulate drug carriers remains challenging, in part due to a limited understanding of the determinants of nanoparticle entry and transport in target cells. Recent studies have shown that Niemann-Pick C1 (NPC1), the lysosome membrane protein that mediates trafficking of cholesterol in cells, is involved in the endosomal escape and subsequent infection caused by filoviruses, and that its absence promotes the retention and efficacy of lipid nanoparticles encapsulating siRNA. Here, we report that NPC1 deficiency results in dramatic reduction in internalization and transfection efficiency mediated by degradable cationic gene delivery polymers, poly(β-amino ester)s (PBAEs). PBAEs utilized cholesterol and dynamin-dependent endocytosis pathways, and these were found to be heavily compromised in NPC1-deficient cells. In contrast, the absence of NPC1 had minor effects on DNA uptake mediated by polyethylenimine or Lipofectamine 2000. Strikingly, stable overexpression of human NPC1 in chinese hamster ovary cells was associated with enhanced gene uptake (3-fold) and transfection (10-fold) by PBAEs. These findings reveal a role of NPC1 in the regulation of endocytic mechanisms affecting nanoparticle trafficking. We hypothesize that in-depth understanding sites of entry and endosomal escape may lead to highly efficient nanotechnologies for drug delivery.
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Affiliation(s)
- Ahmed A. Eltoukhy
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Gaurav Sahay
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - James M. Cunningham
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Daniel G. Anderson
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Chemical Engineering, Harvard-MIT Division of Health Sciences and Technology, and Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Fan Y, Li F, Chen D. Scavenger receptor-recognized and enzyme-responsive nanoprobe for fluorescent labeling of lysosomes in live cells. Biomaterials 2014; 35:7870-80. [PMID: 24929616 DOI: 10.1016/j.biomaterials.2014.05.054] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 05/20/2014] [Indexed: 12/23/2022]
Abstract
Lysosomal imaging represents a potent tool for investigating the organization of related cellular events and their modulation via diagnostic and therapeutic approaches. However, specific labeling of the lysosome in live cells is a significant challenge. Taking advantage of the inherent lysosomal entry of nanoparticles and unique digestive inclusions in the lysosome, we developed a nanoparticle-based, enzyme-switchable fluorescence OFF-ON strategy for specific labeling of the lysosome and further imaging of extracellular acidification-induced lysosome trafficking in living cells. The nanoprobe comprised a 16 nm spherical gold nanoparticle as the core and an enzyme-responsive oligomer of fluorescein-conjugated oligo(4-vinyl-phenyl phosphate) as the shell. Due to quenching of the core gold nanoparticle, the nanoprobe was non-fluorescent. After incubation with cancer cells, the nanoprobe was rapidly internalized via scavenger receptor-mediated endocytosis and significantly shuffled into the lysosome. The nanoprobe specifically lighted up the lysosome owing to lysosome-induced fluorescence enhancement. Specifically, digestive inclusions in the lysosome hydrolyzed and released gold-quenched fluorescein molecules, leading to significant augmentation of fluorescence. On account of specific lysosomal labeling, the nanoprobe effectively facilitated imaging of a 4-6 μm anterograde trafficking event of the lysosome from the perinuclear region to the cell surface when an acidic extracellular environment developed. Our findings collectively highlight the use of nanoprobes for lysosomal imaging.
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Affiliation(s)
- Yanbin Fan
- Department of Macromolecular Science, The State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, PR China
| | - Fuyou Li
- Department of Chemistry, The State Key Laboratory of Molecular Engineering of Polymers, Institute of Biomedicine Science, Fudan University, Shanghai 200433, PR China.
| | - Daoyong Chen
- Department of Macromolecular Science, The State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, PR China.
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Fridolfsson HN, Roth DM, Insel PA, Patel HH. Regulation of intracellular signaling and function by caveolin. FASEB J 2014; 28:3823-31. [PMID: 24858278 DOI: 10.1096/fj.14-252320] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 05/12/2014] [Indexed: 12/28/2022]
Abstract
Caveolae, flask-like invaginations of the plasma membrane, were discovered nearly 60 years ago. Originally regarded as fixation artifacts of electron microscopy, the functional role for these structures has taken decades to unravel. The discovery of the caveolin protein in 1992 (by the late Richard G.W. Anderson) accelerated progress in defining the contribution of caveolae to cellular physiology and pathophysiology. The three isoforms of caveolin (caveolin-1, -2, and -3) are caveolae-resident structural and scaffolding proteins that are critical for the formation of caveolae and their localization of signaling entities. A PubMed search for "caveolae" reveals ∼280 publications from their discovery in the 1950s to the early 1990s, whereas a search for "caveolae or caveolin" after 1990, identifies ∼7000 entries. Most work on the regulation of biological responses by caveolae and caveolin since 1990 has focused on caveolae as plasma membrane microdomains and the function of caveolin proteins at the plasma membrane. By contrast, our recent work and that of others has explored the localization of caveolins in multiple cellular membrane compartments and in the regulation of intracellular signaling. Cellular organelles that contain caveolin include mitochondria, nuclei and the endoplasmic reticulum. Such intracellular localization allows for a complexity of responses to extracellular stimuli by caveolin and the possibility of novel organelle-targeted therapeutics. This review focuses on the impact of intracellular localization of caveolin on signal transduction and cell regulation.
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Affiliation(s)
- Heidi N Fridolfsson
- VA San Diego Healthcare System, San Diego, California and the Departments of Anesthesiology
| | - David M Roth
- VA San Diego Healthcare System, San Diego, California and the Departments of Anesthesiology
| | - Paul A Insel
- Medicine, and Pharmacology, University of California San Diego, La Jolla, California
| | - Hemal H Patel
- VA San Diego Healthcare System, San Diego, California and the Departments of Anesthesiology,
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Pepino MY, Kuda O, Samovski D, Abumrad NA. Structure-function of CD36 and importance of fatty acid signal transduction in fat metabolism. Annu Rev Nutr 2014; 34:281-303. [PMID: 24850384 DOI: 10.1146/annurev-nutr-071812-161220] [Citation(s) in RCA: 404] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
CD36 (cluster of differentiation 36) is a scavenger receptor that functions in high-affinity tissue uptake of long-chain fatty acids (FAs) and contributes under excessive fat supply to lipid accumulation and metabolic dysfunction. This review describes recent evidence regarding the CD36 FA binding site and a potential mechanism for FA transfer. It also presents the view that CD36 and FA signaling coordinate fat utilization, a view that is based on newly identified CD36 actions that involve oral fat perception, intestinal fat absorption, secretion of the peptides cholecystokinin and secretin, regulation of hepatic lipoprotein output, activation of beta oxidation by muscle, and regulation of the production of the FA-derived bioactive eicosanoids. Thus abnormalities of fat metabolism and the associated pathology might involve dysfunction of CD36-mediated signal transduction in addition to the changes in FA uptake.
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Involvement of microtubular network and its motors in productive endocytic trafficking of mouse polyomavirus. PLoS One 2014; 9:e96922. [PMID: 24810588 PMCID: PMC4014599 DOI: 10.1371/journal.pone.0096922] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 04/14/2014] [Indexed: 12/18/2022] Open
Abstract
Infection of non-enveloped polyomaviruses depends on an intact microtubular network. Here we focus on mouse polyomavirus (MPyV). We show that the dynamics of MPyV cytoplasmic transport reflects the characteristics of microtubular motor-driven transport with bi-directional saltatory movements. In cells treated with microtubule-disrupting agents, localization of MPyV was significantly perturbed, the virus was retained at the cell periphery, mostly within membrane structures resembling multicaveolar complexes, and at later times post-infection, only a fraction of the virus was found in Rab7-positive endosomes and multivesicular bodies. Inhibition of cytoplasmic dynein-based motility by overexpression of dynamitin affected perinuclear translocation of the virus, delivery of virions to the ER and substantially reduced the numbers of infected cells, while overexpression of dominant-negative form of kinesin-1 or kinesin-2 had no significant impact on virus localization and infectivity. We also found that transport along microtubules was important for MPyV-containing endosome sequential acquisition of Rab5, Rab7 and Rab11 GTPases. However, in contrast to dominant-negative mutant of Rab7 (T22N), overexpression of dominant-negative mutant Rab11 (S25N) did not affect the virus infectivity. Altogether, our study revealed that MPyV cytoplasmic trafficking leading to productive infection bypasses recycling endosomes, does not require the function of kinesin-1 and kinesin-2, but depends on functional dynein-mediated transport along microtubules for translocation of the virions from peripheral, often caveolin-positive compartments to late endosomes and ER – a prerequisite for efficient delivery of the viral genome to the nucleus.
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