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Resko ZJ, Suhi RF, Thota AV, Kroken AR. Evidence for intracellular Pseudomonas aeruginosa. J Bacteriol 2024; 206:e0010924. [PMID: 38597609 PMCID: PMC11112991 DOI: 10.1128/jb.00109-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024] Open
Abstract
Pseudomonas aeruginosa is a significant cause of global morbidity and mortality. Although it is often regarded as an extracellular pathogen toward human cells, numerous investigations report its ability to survive and replicate within host cells, and additional studies demonstrate specific mechanisms enabling it to adopt an intracellular lifestyle. This ability of P. aeruginosa remains less well-investigated than that of other intracellular bacteria, although it is currently gaining attention. If intracellular bacteria are not killed after entering host cells, they may instead receive protection from immune recognition and experience reduced exposure to antibiotic therapy, among additional potential advantages shared with other facultative intracellular pathogens. For this review, we compiled studies that observe intracellular P. aeruginosa across strains, cell types, and experimental systems in vitro, as well as contextualize these findings with the few studies that report similar observations in vivo. We also seek to address key findings that drove the perception that P. aeruginosa remains extracellular in order to reconcile what is currently understood about intracellular pathogenesis and highlight open questions regarding its contribution to disease.
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Affiliation(s)
- Zachary J. Resko
- Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois, USA
| | - Rachel F. Suhi
- Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois, USA
| | - Adam V. Thota
- Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois, USA
| | - Abby R. Kroken
- Department of Microbiology and Immunology, Loyola University Chicago, Maywood, Illinois, USA
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2
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Tse CM, Zhang Z, Lin R, Sarker R, Donowitz M, Singh V. The Air-Liquid Interface Reorganizes Membrane Lipids and Enhances the Recruitment of Slc26a3 to Lipid-Rich Domains in Human Colonoid Monolayers. Int J Mol Sci 2023; 24:8273. [PMID: 37175979 PMCID: PMC10179158 DOI: 10.3390/ijms24098273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 05/02/2023] [Accepted: 05/03/2023] [Indexed: 05/15/2023] Open
Abstract
Cholesterol-rich membrane domains, also called lipid rafts (LRs), are specialized membrane domains that provide a platform for intracellular signal transduction. Membrane proteins often cluster in LRs that further aggregate into larger platform-like structures that are enriched in ceramides and are called ceramide-rich platforms (CRPs). The role of CRPs in the regulation of intestinal epithelial functions remains unknown. Down-regulated in adenoma (DRA) is an intestinal Cl-/HCO3- antiporter that is enriched in LRs. However, little is known regarding the mechanisms involved in the regulation of DRA activity. The air-liquid interface (ALI) was created by removing apical media for a specified number of days; from 12-14 days post-confluency, Caco-2/BBe cells or a colonoid monolayer were grown as submerged cultures. Confocal imaging was used to examine the dimensions of membrane microdomains that contained DRA. DRA expression and activity were enhanced in Caco-2/BBe cells and human colonoids using an ALI culture method. ALI causes an increase in acid sphingomyelinase (ASMase) activity, an enzyme responsible for enhancing ceramide content in the plasma membrane. ALI cultures expressed a larger number of DRA-containing platforms with dimensions >2 µm compared to cells grown as submerged cultures. ASMase inhibitor, desipramine, disrupted CRPs and reduced the ALI-induced increase in DRA expression in the apical membrane. Exposing normal human colonoid monolayers to ALI increased the ASMase activity and enhanced the differentiation of colonoids along with basal and forskolin-stimulated DRA activities. ALI increases DRA activity and expression by increasing ASMase activity and platform formation in Caco-2/BBe cells and by enhancing the differentiation of colonoids.
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Affiliation(s)
- C. Ming Tse
- Division of Gastroenterology & Hepatology, Department of Medicine, School of Medicine, The Johns Hopkins University, 720 Rutland Avenue, 933 Ross Research Building, Baltimore, MD 21205, USA
| | - Zixin Zhang
- Division of Gastroenterology & Hepatology, Department of Medicine, School of Medicine, The Johns Hopkins University, 720 Rutland Avenue, 933 Ross Research Building, Baltimore, MD 21205, USA
| | - Ruxian Lin
- Division of Gastroenterology & Hepatology, Department of Medicine, School of Medicine, The Johns Hopkins University, 720 Rutland Avenue, 933 Ross Research Building, Baltimore, MD 21205, USA
| | - Rafiquel Sarker
- Division of Gastroenterology & Hepatology, Department of Medicine, School of Medicine, The Johns Hopkins University, 720 Rutland Avenue, 933 Ross Research Building, Baltimore, MD 21205, USA
| | - Mark Donowitz
- Division of Gastroenterology & Hepatology, Department of Medicine, School of Medicine, The Johns Hopkins University, 720 Rutland Avenue, 933 Ross Research Building, Baltimore, MD 21205, USA
- Department of Cellular and Molecular Physiology, School of Medicine, The Johns Hopkins University, Baltimore, MD 21205, USA
| | - Varsha Singh
- Division of Gastroenterology & Hepatology, Department of Medicine, School of Medicine, The Johns Hopkins University, 720 Rutland Avenue, 933 Ross Research Building, Baltimore, MD 21205, USA
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Badr A, Eltobgy M, Krause K, Hamilton K, Estfanous S, Daily KP, Abu Khweek A, Hegazi A, Anne MNK, Carafice C, Robledo-Avila F, Saqr Y, Zhang X, Bonfield TL, Gavrilin MA, Partida-Sanchez S, Seveau S, Cormet-Boyaka E, Amer AO. CFTR Modulators Restore Acidification of Autophago-Lysosomes and Bacterial Clearance in Cystic Fibrosis Macrophages. Front Cell Infect Microbiol 2022; 12:819554. [PMID: 35252032 PMCID: PMC8890004 DOI: 10.3389/fcimb.2022.819554] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Accepted: 01/19/2022] [Indexed: 12/17/2022] Open
Abstract
Cystic fibrosis (CF) human and mouse macrophages are defective in their ability to clear bacteria such as Burkholderia cenocepacia. The autophagy process in CF (F508del) macrophages is halted, and the underlying mechanism remains unclear. Furthermore, the role of CFTR in maintaining the acidification of endosomal and lysosomal compartments in CF cells has been a subject of debate. Using 3D reconstruction of z-stack confocal images, we show that CFTR is recruited to LC3-labeled autophagosomes harboring B. cenocepacia. Using several complementary approaches, we report that CF macrophages display defective lysosomal acidification and degradative function for cargos destined to autophagosomes, whereas non-autophagosomal cargos are effectively degraded within acidic compartments. Notably, treatment of CF macrophages with CFTR modulators (tezacaftor/ivacaftor) improved the autophagy flux, lysosomal acidification and function, and bacterial clearance. In addition, CFTR modulators improved CFTR function as demonstrated by patch-clamp. In conclusion, CFTR regulates the acidification of a specific subset of lysosomes that specifically fuse with autophagosomes. Therefore, our study describes a new biological location and function for CFTR in autophago-lysosomes and clarifies the long-standing discrepancies in the field.
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Affiliation(s)
- Asmaa Badr
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
- Clinical Pathology Department, College of Medicine, Mansoura University, Mansoura, Egypt
| | - Mostafa Eltobgy
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Kathrin Krause
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
- Max Planck Unit for the Science of Pathogens, Berlin, Germany
| | - Kaitlin Hamilton
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Shady Estfanous
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
- Biochemistry and Molecular Biology Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
| | - Kylene P. Daily
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Arwa Abu Khweek
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
- Department of Biology and Biochemistry, Birzeit University, West Bank, Palestine
| | - Ahmad Hegazi
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Midhun N. K. Anne
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Cierra Carafice
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Frank Robledo-Avila
- Center for Microbial Pathogenesis, Nationwide Children’s Hospital, Columbus, OH, United States
| | - Youssra Saqr
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Xiaoli Zhang
- Center for Biostatistics, Ohio State University, Columbus, OH, United States
| | - Tracey L. Bonfield
- Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University, Cleveland, OH, United States
| | - Mikhail A. Gavrilin
- Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University, Columbus, OH, United States
| | | | - Stephanie Seveau
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Estelle Cormet-Boyaka
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, United States
| | - Amal O. Amer
- Department of Microbial Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, United States
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4
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Thomas JM, Sudhadevi T, Basa P, Ha AW, Natarajan V, Harijith A. The Role of Sphingolipid Signaling in Oxidative Lung Injury and Pathogenesis of Bronchopulmonary Dysplasia. Int J Mol Sci 2022; 23:ijms23031254. [PMID: 35163176 PMCID: PMC8835774 DOI: 10.3390/ijms23031254] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/19/2022] [Accepted: 01/20/2022] [Indexed: 02/07/2023] Open
Abstract
Premature infants are born with developing lungs burdened by surfactant deficiency and a dearth of antioxidant defense systems. Survival rate of such infants has significantly improved due to advances in care involving mechanical ventilation and oxygen supplementation. However, a significant subset of such survivors develops the chronic lung disease, Bronchopulmonary dysplasia (BPD), characterized by enlarged, simplified alveoli and deformed airways. Among a host of factors contributing to the pathogenesis is oxidative damage induced by exposure of the developing lungs to hyperoxia. Recent data indicate that hyperoxia induces aberrant sphingolipid signaling, leading to mitochondrial dysfunction and abnormal reactive oxygen species (ROS) formation (ROS). The role of sphingolipids such as ceramides and sphingosine 1-phosphate (S1P), in the development of BPD emerged in the last decade. Both ceramide and S1P are elevated in tracheal aspirates of premature infants of <32 weeks gestational age developing BPD. This was faithfully reflected in the murine models of hyperoxia and BPD, where there is an increased expression of sphingolipid metabolites both in lung tissue and bronchoalveolar lavage. Treatment of neonatal pups with a sphingosine kinase1 specific inhibitor, PF543, resulted in protection against BPD as neonates, accompanied by improved lung function and reduced airway remodeling as adults. This was accompanied by reduced mitochondrial ROS formation. S1P receptor1 induced by hyperoxia also aggravates BPD, revealing another potential druggable target in this pathway for BPD. In this review we aim to provide a detailed description on the role played by sphingolipid signaling in hyperoxia induced lung injury and BPD.
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Affiliation(s)
- Jaya M. Thomas
- Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106, USA; (J.M.T.); (T.S.); (P.B.); (A.W.H.)
| | - Tara Sudhadevi
- Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106, USA; (J.M.T.); (T.S.); (P.B.); (A.W.H.)
| | - Prathima Basa
- Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106, USA; (J.M.T.); (T.S.); (P.B.); (A.W.H.)
| | - Alison W. Ha
- Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106, USA; (J.M.T.); (T.S.); (P.B.); (A.W.H.)
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Viswanathan Natarajan
- Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago, Chicago, IL 60607, USA;
- Department of Medicine, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Anantha Harijith
- Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106, USA; (J.M.T.); (T.S.); (P.B.); (A.W.H.)
- Correspondence: ; Tel.: +1-(216)-286-7038
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5
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Chatterjee R, Chowdhury AR, Mukherjee D, Chakravortty D. Lipid larceny: channelizing host lipids for establishing successful pathogenesis by bacteria. Virulence 2021; 12:195-216. [PMID: 33356849 PMCID: PMC7808437 DOI: 10.1080/21505594.2020.1869441] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 12/03/2020] [Accepted: 12/17/2020] [Indexed: 12/16/2022] Open
Abstract
Lipids are complex organic compounds made up of carbon, oxygen, and hydrogen. These play a diverse and intricate role in cellular processes like membrane trafficking, protein sorting, signal transduction, and bacterial infections. Both Gram-positive bacteria (Staphylococcus sp., Listeria monocytogenes, etc.) and Gram-negative bacteria (Chlamydia sp., Salmonella sp., E. coli, etc.) can hijack the various host-lipids and utilize them structurally as well as functionally to mount a successful infection. The pathogens can deploy with various arsenals to exploit host membrane lipids and lipid-associated receptors as an attachment for toxins' landing or facilitate their entry into the host cellular niche. Bacterial species like Mycobacterium sp. can also modulate the host lipid metabolism to fetch its carbon source from the host. The sequential conversion of host membrane lipids into arachidonic acid and prostaglandin E2 due to increased activity of cPLA-2 and COX-2 upon bacterial infection creates immunosuppressive conditions and facilitates the intracellular growth and proliferation of bacteria. However, lipids' more debatable role is that they can also be a blessing in disguise. Certain host-lipids, especially sphingolipids, have been shown to play a crucial antibacterial role and help the host in combating the infections. This review shed light on the detailed role of host lipids in bacterial infections and the current understanding of the lipid in therapeutics. We have also discussed potential prospects and the need of the hour to help us cope in this race against deadly pathogens and their rapidly evolving stealthy virulence strategies.
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Affiliation(s)
- Ritika Chatterjee
- Department of Microbiology and Cell Biology, Division of Biological Sciences, Indian Institute of Science, Bangalore, India
| | - Atish Roy Chowdhury
- Department of Microbiology and Cell Biology, Division of Biological Sciences, Indian Institute of Science, Bangalore, India
| | - Debapriya Mukherjee
- Department of Microbiology and Cell Biology, Division of Biological Sciences, Indian Institute of Science, Bangalore, India
| | - Dipshikha Chakravortty
- Department of Microbiology and Cell Biology, Division of Biological Sciences, Indian Institute of Science, Bangalore, India
- Centre for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, India
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6
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Pittet JF, Hu PJ, Honavar J, Brandon AP, Evans CA, Muthalaly R, Ding Q, Wagener BM. Estrogen Alleviates Sex-Dependent Differences in Lung Bacterial Clearance and Mortality Secondary to Bacterial Pneumonia after Traumatic Brain Injury. J Neurotrauma 2020; 38:989-999. [PMID: 33203297 DOI: 10.1089/neu.2020.7327] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Traumatic brain injury (TBI) is the leading cause of injury-related death and disability in patients under the age of 46 years. Survivors of the initial injury often endure systemic complications such as pulmonary infection, and Pseudomonas aeruginosa is one of the most common causes of nosocomial pneumonia in intensive care units. Female patients are less likely to develop secondary pneumonia after TBI, and pre-clinical studies have revealed a salutary role for estrogen after trauma. Therefore, we hypothesized that female mice would experience less mortality after post-TBI pneumonia with P. aeruginosa. We employed a mouse model of TBI followed by P. aeruginosa pneumonia. Male mice had greater mortality and impaired lung bacterial clearance after post-TBI pneumonia compared with female mice. This was confirmed as a difference in sex hormones, as oophorectomized wild-type mice had mortality and lung bacterial clearance similar to male mice. There were differences in tumor necrosis factor-α secretion in male and female alveolar macrophages after P. aeruginosa infection. Finally, injection of male or oophorectomized wild-type female mice with estrogen restored lung bacterial clearance and prevented mortality. Our model of TBI followed by P. aeruginosa pneumonia is among the first to reveal sex dimorphism in secondary, long-term TBI complications.
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Affiliation(s)
- Jean-Francois Pittet
- Divisions of Critical Care Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA.,Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Parker J Hu
- Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jaideep Honavar
- Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Angela P Brandon
- Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Cilina A Evans
- Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Rebekah Muthalaly
- Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Qiang Ding
- Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Brant M Wagener
- Divisions of Critical Care Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA.,Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine and University of Alabama at Birmingham, Birmingham, Alabama, USA
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7
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Jackson L, Waters V. Factors influencing the acquisition and eradication of early Pseudomonas aeruginosa infection in cystic fibrosis. J Cyst Fibros 2020; 20:8-16. [PMID: 33172756 DOI: 10.1016/j.jcf.2020.10.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 10/02/2020] [Accepted: 10/27/2020] [Indexed: 12/21/2022]
Abstract
In recent years considerable improvements have been made in increasing the life expectancy of patients with cystic fibrosis. New highly effective modulator therapies targeting the underlying defect in the cystic fibrosis transmembrane conductance regulator protein are expected to enhance lifespan even further. However, chronic Pseudomonas aeruginosa pulmonary infections continue to threaten CF patient lung health and mortality rates. Early and aggressive antibiotic eradication therapies targeting P. aeruginosa are standard practice, but these eradication therapies fail in 10-40% of patients. The reasons for P. aeruginosa eradication failure remain unclear. Thus, this review summarizes the evidence to date for pseudomonal acquisition and eradication failure in the cystic fibrosis lung. A complex combination of host and bacterial factors are responsible for initial establishment of P. aeruginosa pulmonary infections. Moreover, host and pseudomonal factors, polymicrobial interactions, and antimicrobial limitations in relation to P. aeruginosa eradication therapy failure are summarized.
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Affiliation(s)
- Lindsay Jackson
- Translational Medicine, Hospital for Sick Children, Toronto, Canada.
| | - Valerie Waters
- Translational Medicine, Hospital for Sick Children, Toronto, Canada; Infectious Diseases, Department of Pediatrics, Hospital for Sick Children, Toronto, Canada
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8
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Emerging roles of lysophospholipids in health and disease. Prog Lipid Res 2020; 80:101068. [PMID: 33068601 DOI: 10.1016/j.plipres.2020.101068] [Citation(s) in RCA: 140] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/09/2020] [Accepted: 10/11/2020] [Indexed: 12/22/2022]
Abstract
Lipids are abundant and play essential roles in human health and disease. The main functions of lipids are building blocks for membrane biogenesis. However, lipids are also metabolized to produce signaling molecules. Here, we discuss the emerging roles of circulating lysophospholipids. These lysophospholipids consist of lysoglycerophospholipids and lysosphingolipids. They are both present in cells at low concentration, but their concentrations in extracellular fluids are significantly higher. The biological functions of some of these lysophospholipids have been recently revealed. Remarkably, some of the lysophospholipids play pivotal signaling roles as well as being precursors for membrane biogenesis. Revealing how circulating lysophospholipids are produced, released, transported, and utilized in multi-organ systems is critical to understand their functions. The discovery of enzymes, carriers, transporters, and membrane receptors for these lysophospholipids has shed light on their physiological significance. In this review, we summarize the biological roles of these lysophospholipids via discussing about the proteins regulating their functions. We also discuss about their potential impacts to human health and diseases.
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9
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Qin S, Li J, Zhou C, Privratsky B, Schettler J, Deng X, Xia Z, Zeng Y, Wu H, Wu M. SHIP-1 Regulates Phagocytosis and M2 Polarization Through the PI3K/Akt-STAT5-Trib1 Circuit in Pseudomonas aeruginosa Infection. Front Immunol 2020; 11:307. [PMID: 32256487 PMCID: PMC7093384 DOI: 10.3389/fimmu.2020.00307] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 02/06/2020] [Indexed: 02/05/2023] Open
Abstract
SHIP-1 is an inositol phosphatase that hydrolyzes phosphatidylinositol 3-kinase (PI3K) products and negatively regulates protein kinase B (Akt) activity, thereby modulating a variety of cellular processes in mammals. However, the role of SHIP-1 in bacterial-induced sepsis is largely unknown. Here, we show that SHIP-1 regulates inflammatory responses during Gram-negative bacterium Pseudomonas aeruginosa infection. We found that infected-SHIP-1-/- mice exhibited decreased survival rates, increased inflammatory responses, and susceptibility owing to elevated expression of PI3K than wild-type (WT) mice. Inhibiting SHIP-1 via siRNA silencing resulted in lipid raft aggregates, aggravated oxidative damage, and bacterial burden in macrophages after PAO1 infection. Mechanistically, SHIP-1 deficiency augmented phosphorylation of PI3K and nuclear transcription of signal transducer and activator of transcription 5 (STAT5) to induce the expression of Trib1, which is critical for differentiation of M2 but not M1 macrophages. These findings reveal a previously unrecognized role of SHIP-1 in inflammatory responses and macrophage homeostasis during P. aeruginosa infection through a PI3K/Akt-STAT5-Trib1 axis.
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Affiliation(s)
- Shugang Qin
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, United States
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Jiaxin Li
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, United States
- Department of Liver Surgery, West China Hospital, Sichuan University, Chengdu, China
| | - Chuanmin Zhou
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, United States
| | - Breanna Privratsky
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, United States
| | - Jacob Schettler
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, United States
| | - Xin Deng
- Department of Pediatrics and Department of Pulmonary & Critical Care Medicine, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhenwei Xia
- Department of Pediatrics and Department of Pulmonary & Critical Care Medicine, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yong Zeng
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Hong Wu
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Min Wu
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, United States
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Plasma Levels of the Bioactive Sphingolipid Metabolite S1P in Adult Cystic Fibrosis Patients: Potential Target for Immunonutrition? Nutrients 2020; 12:nu12030765. [PMID: 32183316 PMCID: PMC7146441 DOI: 10.3390/nu12030765] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/05/2020] [Accepted: 03/11/2020] [Indexed: 01/03/2023] Open
Abstract
Recent research has linked sphingolipid (SL) metabolism with cystic fibrosis transmembrane conductance regulator (CFTR) activity, affecting bioactive lipid mediator sphingosine-1-phosphate (S1P). We hypothesize that loss of CFTR function in cystic fibrosis (CF) patients influenced plasma S1P levels. Total and unbound plasma S1P levels were measured in 20 lung-transplanted adult CF patients and 20 healthy controls by mass spectrometry and enzyme-linked immunosorbent assay (ELISA). S1P levels were correlated with CFTR genotype, routine laboratory parameters, lung function and pathogen colonization, and clinical symptoms. Compared to controls, CF patients showed lower unbound plasma S1P, whereas total S1P levels did not differ. A positive correlation of total and unbound S1P levels was found in healthy controls, but not in CF patients. Higher unbound S1P levels were measured in ΔF508-homozygous compared to ΔF508-heterozygous CF patients (p = 0.038), accompanied by higher levels of HDL in ΔF508-heterozygous patients. Gastrointestinal symptoms were more common in ΔF508 heterozygotes compared to ΔF508 homozygotes. This is the first clinical study linking plasma S1P levels with CFTR function and clinical presentation in adult CF patients. Given the emerging role of immunonutrition in CF, our study might pave the way for using S1P as a novel biomarker and nutritional target in CF.
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11
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Bal Topçu D, Tugcu G, Ozcan F, Aslan M, Yalcinkaya A, Polat SE, Hizal M, Yalcin EE, Ersoz DD, Ozcelik U, Kiper N, Lay I, Oztas Y. Plasma Ceramides and Sphingomyelins of Pediatric Patients Increase in Primary Ciliary Dyskinesia but Decrease in Cystic Fibrosis. Lipids 2020; 55:213-223. [PMID: 32120452 DOI: 10.1002/lipd.12230] [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] [Received: 10/04/2019] [Revised: 02/09/2020] [Accepted: 02/18/2020] [Indexed: 11/06/2022]
Abstract
We investigated plasma sphingomyelin (CerPCho) and ceramide (Cer) levels in pediatric patients with cystic fibrosis (CF) and primary ciliary dyskinesia (PCD). Plasma samples were obtained from CF (n = 19) and PCD (n = 7) patients at exacerbation, discharge, and stable periods. Healthy children (n = 17) of similar age served as control. Levels of 16-24 CerPCho and 16-24 Cer were measured by LC-MS/MS. Concentrations of all CerPCho and Cer species measured at exacerbation were significantly lower in patients with CF than PCD. 16, 18, 24 CerPCho, and 22, 24 Cer in exacerbation; 18, 24 CerPCho, and 18, 20, 22, 24 Cer at discharge; 18, 24 CerPCho and 24 Cer at stable period were significantly lower in CF patients than healthy children (p < 0.001 and p < 0.05). All CerPCho and Cer levels of PCD patients were significantly higher except 24 CerPCho and 24 Cer during exacerbation, 24 CerPCho at discharge, and 18, 22 CerPCho levels at stable period (p < 0.001 and p < 0.05) compared with healthy children. There was no significant difference among exacerbation, discharge, and stable periods in each group for Cer and CerPCho levels. This is the first study measuring plasma Cer and CerPCho levels in PCD and third study in CF patients. The dramatic difference in plasma levels of most CerPCho and Cer species found between two diseases suggest that cilia pathology in PCD and CFTR mutation in CF seem to alter sphingolipid metabolism possibly in opposite directions.
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Affiliation(s)
- Dilara Bal Topçu
- Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Gokcen Tugcu
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Filiz Ozcan
- Department of Medical Biochemistry, Faculty of Medicine, Akdeniz University, Antalya, Konyaaltı, 07070, Turkey
| | - Mutay Aslan
- Department of Medical Biochemistry, Faculty of Medicine, Akdeniz University, Antalya, Konyaaltı, 07070, Turkey
| | - Ahmet Yalcinkaya
- Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Sanem Eryilmaz Polat
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Mina Hizal
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Ebru Elmas Yalcin
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Deniz Dogru Ersoz
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Ugur Ozcelik
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Nural Kiper
- Department of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Incilay Lay
- Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
| | - Yesim Oztas
- Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Sıhhıye, 06100, Turkey
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12
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Garić D, De Sanctis JB, Shah J, Dumut DC, Radzioch D. Biochemistry of very-long-chain and long-chain ceramides in cystic fibrosis and other diseases: The importance of side chain. Prog Lipid Res 2019:100998. [PMID: 31445070 DOI: 10.1016/j.plipres.2019.100998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/01/2019] [Accepted: 03/10/2019] [Indexed: 12/18/2022]
Abstract
Ceramides, the principal building blocks of all sphingolipids, have attracted the attention of many scientists around the world interested in developing treatments for cystic fibrosis, the most common genetic disease of Caucasians. Many years of fruitful research in this field have produced some fundamentally important, yet controversial results. Here, we aimed to summarize the current knowledge on the role of long- and very-long- chain ceramides, the most abundant species of ceramides in animal cells, in cystic fibrosis and other diseases. We also aim to explain the importance of the length of their side chain in the context of stability of transmembrane proteins through a concise synthesis of their biophysical chemistry, cell biology, and physiology. This review also addresses several remaining riddles in this field. Finally, we discuss the technical challenges associated with the analysis and quantification of ceramides. We provide the evaluation of the antibodies used for ceramide quantification and we demonstrate their lack of specificity. Results and discussion presented here will be of interest to anyone studying these enigmatic lipids.
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Affiliation(s)
- Dušan Garić
- Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Juan B De Sanctis
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Juhi Shah
- Department of Pharmacology and Experimental Therapeutics, McGill University, Montreal, QC, Canada
| | - Daciana Catalina Dumut
- Department of Medicine, Division of Experimental Medicine, McGill University, Montreal, QC, Canada
| | - Danuta Radzioch
- Department of Human Genetics, McGill University, Montreal, QC, Canada; Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic; Department of Medicine, Division of Experimental Medicine, McGill University, Montreal, QC, Canada.
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13
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Abu-Arish A, Pandžić E, Kim D, Tseng HW, Wiseman PW, Hanrahan JW. Agonists that stimulate secretion promote the recruitment of CFTR into membrane lipid microdomains. J Gen Physiol 2019; 151:834-849. [PMID: 31048413 PMCID: PMC6572005 DOI: 10.1085/jgp.201812143] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 04/05/2019] [Indexed: 01/20/2023] Open
Abstract
The cystic fibrosis transmembrane conductance regulator (CFTR) is a tightly regulated anion channel that mediates secretion by epithelia and is mutated in the disease cystic fibrosis. CFTR forms macromolecular complexes with many proteins; however, little is known regarding its associations with membrane lipids or the regulation of its distribution and mobility at the cell surface. We report here that secretagogues (agonists that stimulate secretion) such as the peptide hormone vasoactive intestinal peptide (VIP) and muscarinic agonist carbachol increase CFTR aggregation into cholesterol-dependent clusters, reduce CFTR lateral mobility within and between membrane microdomains, and trigger the fusion of clusters into large (3.0 µm2) ceramide-rich platforms. CFTR clusters are closely associated with motile cilia and with the enzyme acid sphingomyelinase (ASMase) that is constitutively bound on the cell surface. Platform induction is prevented by pretreating cells with cholesterol oxidase to disrupt lipid rafts or by exposure to the ASMase functional inhibitor amitriptyline or the membrane-impermeant reducing agent 2-mercaptoethanesulfonate. Platforms are reversible, and their induction does not lead to an increase in apoptosis; however, blocking platform formation does prevent the increase in CFTR surface expression that normally occurs during VIP stimulation. These results demonstrate that CFTR is colocalized with motile cilia and reveal surprisingly robust regulation of CFTR distribution and lateral mobility, most likely through autocrine redox activation of extracellular ASMase. Formation of ceramide-rich platforms containing CFTR enhances transepithelial secretion and likely has other functions related to inflammation and mucosal immunity.
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Affiliation(s)
- Asmahan Abu-Arish
- Department of Physiology, McGill University, Montréal, Canada
- Department of Physics, McGill University, Montréal, Canada
- Cystic Fibrosis Translational Research Centre, McGill University, Montréal, Canada
| | - Elvis Pandžić
- Department of Physics, McGill University, Montréal, Canada
| | - Dusik Kim
- Department of Physiology, McGill University, Montréal, Canada
- Cystic Fibrosis Translational Research Centre, McGill University, Montréal, Canada
| | - Hsin Wei Tseng
- Department of Physiology, McGill University, Montréal, Canada
| | - Paul W Wiseman
- Department of Physics, McGill University, Montréal, Canada
- Department of Chemistry, McGill University, Montréal, Canada
- Cystic Fibrosis Translational Research Centre, McGill University, Montréal, Canada
| | - John W Hanrahan
- Department of Physiology, McGill University, Montréal, Canada
- Cystic Fibrosis Translational Research Centre, McGill University, Montréal, Canada
- McGill University Health Centre Research Institute, Montréal, Canada
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14
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McHugh BJ, Wang R, Li HN, Beaumont PE, Kells R, Stevens H, Young L, Rossi AG, Gray RD, Dorin JR, Gwyer Findlay EL, Brough D, Davidson DJ. Cathelicidin is a "fire alarm", generating protective NLRP3-dependent airway epithelial cell inflammatory responses during infection with Pseudomonas aeruginosa. PLoS Pathog 2019; 15:e1007694. [PMID: 30978238 PMCID: PMC6481867 DOI: 10.1371/journal.ppat.1007694] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 04/24/2019] [Accepted: 03/11/2019] [Indexed: 01/23/2023] Open
Abstract
Pulmonary infections are a major global cause of morbidity, exacerbated by an increasing threat from antibiotic-resistant pathogens. In this context, therapeutic interventions aimed at protectively modulating host responses, to enhance defence against infection, take on ever greater significance. Pseudomonas aeruginosa is an important multidrug-resistant, opportunistic respiratory pathogen, the clearance of which can be enhanced in vivo by the innate immune modulatory properties of antimicrobial host defence peptides from the cathelicidin family, including human LL-37. Initially described primarily as bactericidal agents, cathelicidins are now recognised as multifunctional antimicrobial immunomodulators, modifying host responses to pathogens, but the key mechanisms involved in these protective functions are not yet defined. We demonstrate that P. aeruginosa infection of airway epithelial cells promotes extensive infected cell internalisation of LL-37, in a manner that is dependent upon epithelial cell interaction with live bacteria, but does not require bacterial Type 3 Secretion System (T3SS). Internalised LL-37 acts as a second signal to induce inflammasome activation in airway epithelial cells, which, in contrast to myeloid cells, are relatively unresponsive to P. aeruginosa. We demonstrate that this is mechanistically dependent upon cathepsin B release, and NLRP3-dependent activation of caspase 1. These result in LL-37-mediated release of IL-1β and IL-18 in a manner that is synergistic with P. aeruginosa infection, and can induce caspase 1-dependent death of infected epithelial cells, and promote neutrophil chemotaxis. We propose that cathelicidin can therefore act as a second signal, required by P. aeruginosa infected epithelial cells to promote an inflammasome-mediated altruistic cell death of infection-compromised epithelial cells and act as a "fire alarm" to enhance rapid escalation of protective inflammatory responses to an uncontrolled infection. Understanding this novel modulatory role for cathelicidins, has the potential to inform development of novel therapeutic strategies to antibiotic-resistant pathogens, harnessing innate immunity as a complementation or alternative to current interventions.
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Affiliation(s)
- Brian J. McHugh
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Rongling Wang
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Hsin-Ni Li
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Paula E. Beaumont
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Rebekah Kells
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Holly Stevens
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Lisa Young
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Adriano G. Rossi
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Robert D. Gray
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Julia R. Dorin
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - Emily L. Gwyer Findlay
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
| | - David Brough
- Division of Neuroscience and Experimental Psychology, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
| | - Donald J. Davidson
- Centre for Inflammation Research at the University of Edinburgh, Queens’ Medical Research Institute, Edinburgh BioQuarter, Little France Crescent, Edinburgh, United Kingdom
- * E-mail:
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15
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Garić D, De Sanctis JB, Shah J, Dumut DC, Radzioch D. Biochemistry of very-long-chain and long-chain ceramides in cystic fibrosis and other diseases: The importance of side chain. Prog Lipid Res 2019; 74:130-144. [PMID: 30876862 DOI: 10.1016/j.plipres.2019.03.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/01/2019] [Accepted: 03/10/2019] [Indexed: 12/19/2022]
Abstract
Ceramides, the principal building blocks of all sphingolipids, have attracted the attention of many scientists around the world interested in developing treatments for cystic fibrosis, the most common genetic disease of Caucasians. Many years of fruitful research in this field have produced some fundamentally important, yet controversial results. Here, we aimed to summarize the current knowledge on the role of long- and very-long- chain ceramides, the most abundant species of ceramides in animal cells, in cystic fibrosis and other diseases. We also aim to explain the importance of the length of their side chain in the context of stability of transmembrane proteins through a concise synthesis of their biophysical chemistry, cell biology, and physiology. This review also addresses several remaining riddles in this field. Finally, we discuss the technical challenges associated with the analysis and quantification of ceramides. We provide the evaluation of the antibodies used for ceramide quantification and we demonstrate their lack of specificity. Results and discussion presented here will be of interest to anyone studying these enigmatic lipids.
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Affiliation(s)
- Dušan Garić
- Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Juan B De Sanctis
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Juhi Shah
- Department of Pharmacology and Experimental Therapeutics, McGill University, Montreal, QC, Canada
| | - Daciana Catalina Dumut
- Department of Medicine, Division of Experimental Medicine, McGill University, Montreal, QC, Canada
| | - Danuta Radzioch
- Department of Human Genetics, McGill University, Montreal, QC, Canada; Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic; Department of Medicine, Division of Experimental Medicine, McGill University, Montreal, QC, Canada.
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16
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Fernández-Oliva A, Ortega-González P, Risco C. Targeting host lipid flows: Exploring new antiviral and antibiotic strategies. Cell Microbiol 2019; 21:e12996. [PMID: 30585688 PMCID: PMC7162424 DOI: 10.1111/cmi.12996] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 12/04/2018] [Accepted: 12/17/2018] [Indexed: 12/28/2022]
Abstract
Bacteria and viruses pose serious challenges for humans because they evolve continuously. Despite ongoing efforts, antiviral drugs to treat many of the most troubling viruses have not been approved yet. The recent launch of new antimicrobials is generating hope as more and more pathogens around the world become resistant to available drugs. But extra effort is still needed. One of the current strategies for antiviral and antibiotic drug development is the search for host cellular pathways used by many different pathogens. For example, many viruses and bacteria alter lipid synthesis and transport to build their own organelles inside infected cells. The characterization of these interactions will be fundamental to identify new targets for antiviral and antibiotic drug development. This review discusses how viruses and bacteria subvert cell machineries for lipid synthesis and transport and summarises the most promising compounds that interfere with these pathways.
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Affiliation(s)
| | | | - Cristina Risco
- Cell Structure Lab, National Centre for Biotechnology, CNB-CSIC, Madrid, Spain
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17
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Baker JE, Boudreau RM, Seitz AP, Caldwell CC, Gulbins E, Edwards MJ. Sphingolipids and Innate Immunity: A New Approach to Infection in the Post-Antibiotic Era? Surg Infect (Larchmt) 2018; 19:792-803. [DOI: 10.1089/sur.2018.187] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Jennifer E. Baker
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| | - Ryan M. Boudreau
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| | - Aaron P. Seitz
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| | - Charles C. Caldwell
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
- Division of Research, Shriners Hospital for Children, Cincinnati, Ohio
| | - Erich Gulbins
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
- Department of Molecular Biology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Michael J. Edwards
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
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18
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Zhang J, Wang Y, Jiang X, Chan HC. Cystic fibrosis transmembrane conductance regulator-emerging regulator of cancer. Cell Mol Life Sci 2018; 75:1737-1756. [PMID: 29411041 PMCID: PMC11105598 DOI: 10.1007/s00018-018-2755-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 12/27/2017] [Accepted: 01/17/2018] [Indexed: 12/11/2022]
Abstract
Mutations of cystic fibrosis transmembrane conductance regulator (CFTR) cause cystic fibrosis, the most common life-limiting recessive genetic disease among Caucasians. CFTR mutations have also been linked to increased risk of various cancers but remained controversial for a long time. Recent studies have begun to reveal that CFTR is not merely an ion channel but also an important regulator of cancer development and progression with multiple signaling pathways identified. In this review, we will first present clinical findings showing the correlation of genetic mutations or aberrant expression of CFTR with cancer incidence in multiple cancers. We will then focus on the roles of CFTR in fundamental cellular processes including transformation, survival, proliferation, migration, invasion and epithelial-mesenchymal transition in cancer cells, highlighting the signaling pathways involved. Finally, the association of CFTR expression levels with patient prognosis, and the potential of CFTR as a cancer prognosis indicator in human malignancies will be discussed.
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Affiliation(s)
- Jieting Zhang
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China
| | - Yan Wang
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China
| | - Xiaohua Jiang
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.
| | - Hsiao Chang Chan
- Faculty of Medicine, Epithelial Cell Biology Research Center, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Sha Tin, Hong Kong SAR, People's Republic of China.
- School of Biomedical Sciences Core Laboratory, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, People's Republic of China.
- Sichuan University-The Chinese University of Hong Kong Joint Laboratory for Reproductive Medicine, West China Second University Hospital, Chengdu, People's Republic of China.
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19
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Phagocytosis depends on TRPV2-mediated calcium influx and requires TRPV2 in lipids rafts: alteration in macrophages from patients with cystic fibrosis. Sci Rep 2018. [PMID: 29523858 PMCID: PMC5844937 DOI: 10.1038/s41598-018-22558-5] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Whereas many phagocytosis steps involve ionic fluxes, the underlying ion channels remain poorly defined. As reported in mice, the calcium conducting TRPV2 channel impacts the phagocytic process. Macrophage phagocytosis is critical for defense against pathogens. In cystic fibrosis (CF), macrophages have lost their capacity to act as suppressor cells and thus play a significant role in the initiating stages leading to chronic inflammation/infection. In a previous study, we demonstrated that impaired function of CF macrophages is due to a deficient phagocytosis. The aim of the present study was to investigate TRPV2 role in the phagocytosis capacity of healthy primary human macrophage by studying its activity, its membrane localization and its recruitment in lipid rafts. In primary human macrophages, we showed that P. aeruginosa recruits TRPV2 channels at the cell surface and induced a calcium influx required for bacterial phagocytosis. We presently demonstrate that to be functional and play a role in phagocytosis, TRPV2 might require a preferential localization in lipid rafts. Furthermore, CF macrophage displays a perturbed calcium homeostasis due to a defect in TRPV2. In this context, deregulated TRPV2-signaling in CF macrophages could explain their defective phagocytosis capacity that contribute to the maintenance of chronic infection.
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20
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Lérias J, Pinto M, Benedetto R, Schreiber R, Amaral M, Aureli M, Kunzelmann K. Compartmentalized crosstalk of CFTR and TMEM16A (ANO1) through EPAC1 and ADCY1. Cell Signal 2018; 44:10-19. [PMID: 29331508 DOI: 10.1016/j.cellsig.2018.01.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 12/11/2017] [Accepted: 01/08/2018] [Indexed: 02/08/2023]
Abstract
Airway epithelial cells express both Ca2+ activated TMEM16A/ANO1 and cAMP activated CFTR anion channels. Previous work suggested a significant crosstalk of intracellular Ca2+ and cAMP signaling pathways, leading to activation of both chloride channels. We demonstrate that in airway epithelial cells, stimulation of purinergic or muscarinic G-protein coupled receptors (GPCRs) activates TMEM16A and CFTR. Additional expression of Gq/11 and phospholipase C coupled GPCRs strongly enhanced the crosstalk between Ca2+- and cAMP-dependent signaling. Knockdown of endogenous GRCRs attenuated crosstalk and functional coupling between TMEM16A and CFTR. The number of receptors did not affect expression or membrane localization of TMEM16A or CFTR, but controlled assembly of the local signalosome. GPCRs translocate Ca2+-sensitive adenylate cyclase type 1 (ADCY1) and exchange protein directly activated by cAMP (EPAC1) to particular plasma membrane domains containing GPCRs, CFTR and TMEM16A, thereby producing compartmentalized Ca2+ and cAMP signals and significant crosstalk. While biosynthesis and membrane trafficking of CFTR requires a functional Golgi apparatus, maturation and membrane trafficking of TMEM16A may occur independent of the Golgi. Because Ca2+ activated TMEM16A currents are only transient, continuous Cl- secretion by airway epithelial cells requires CFTR. The present data also explain why receptor-dependent activation of TMEM16A is more efficient than direct stimulation by Ca2+.
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Affiliation(s)
- Joana Lérias
- University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande, C8, 1749-016 Lisboa, Portugal
| | - Madalena Pinto
- University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande, C8, 1749-016 Lisboa, Portugal
| | - Roberta Benedetto
- Institut für Physiologie, Universität Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany
| | - Rainer Schreiber
- Institut für Physiologie, Universität Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany
| | - Margarida Amaral
- University of Lisboa, Faculty of Sciences, BioISI - Biosystems & Integrative Sciences Institute, Campo Grande, C8, 1749-016 Lisboa, Portugal
| | - Massimo Aureli
- Department of Medical Biotechnology and Translational Medicine, University of Milano, Milano, Italy
| | - Karl Kunzelmann
- Institut für Physiologie, Universität Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany.
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21
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Garić D, De Sanctis JB, Wojewodka G, Houle D, Cupri S, Abu-Arish A, Hanrahan JW, Hajduch M, Matouk E, Radzioch D. Fenretinide differentially modulates the levels of long- and very long-chain ceramides by downregulating Cers5 enzyme: evidence from bench to bedside. J Mol Med (Berl) 2017; 95:1053-1064. [DOI: 10.1007/s00109-017-1564-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 05/01/2017] [Accepted: 06/15/2017] [Indexed: 10/19/2022]
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22
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Weidenfeld S, Kuebler WM. Cytokine-Regulation of Na +-K +-Cl - Cotransporter 1 and Cystic Fibrosis Transmembrane Conductance Regulator-Potential Role in Pulmonary Inflammation and Edema Formation. Front Immunol 2017; 8:393. [PMID: 28439270 PMCID: PMC5383711 DOI: 10.3389/fimmu.2017.00393] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/21/2017] [Indexed: 12/20/2022] Open
Abstract
Pulmonary edema, a major complication of lung injury and inflammation, is defined as accumulation of extravascular fluid in the lungs leading to impaired diffusion of respiratory gases. Lung fluid balance across the alveolar epithelial barrier protects the distal airspace from excess fluid accumulation and is mainly regulated by active sodium transport and Cl- absorption. Increased hydrostatic pressure as seen in cardiogenic edema or increased vascular permeability as present in inflammatory lung diseases such as the acute respiratory distress syndrome (ARDS) causes a reversal of transepithelial fluid transport resulting in the formation of pulmonary edema. The basolateral expressed Na+-K+-2Cl- cotransporter 1 (NKCC1) and the apical Cl- channel cystic fibrosis transmembrane conductance regulator (CFTR) are considered to be critically involved in the pathogenesis of pulmonary edema and have also been implicated in the inflammatory response in ARDS. Expression and function of both NKCC1 and CFTR can be modulated by released cytokines; however, the relevance of this modulation in the context of ARDS and pulmonary edema is so far unclear. Here, we review the existing literature on the regulation of NKCC1 and CFTR by cytokines, and-based on the known involvement of NKCC1 and CFTR in lung edema and inflammation-speculate on the role of cytokine-dependent NKCC1/CFTR regulation for the pathogenesis and potential treatment of pulmonary inflammation and edema formation.
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Affiliation(s)
- Sarah Weidenfeld
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON, Canada.,Institute of Physiology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Wolfgang M Kuebler
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, ON, Canada.,Institute of Physiology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Surgery and Physiology, University of Toronto, Toronto, ON, Canada
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23
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Martin GE, Boudreau RM, Couch C, Becker KA, Edwards MJ, Caldwell CC, Gulbins E, Seitz A. Sphingosine's role in epithelial host defense: A natural antimicrobial and novel therapeutic. Biochimie 2017; 141:91-96. [PMID: 28341550 DOI: 10.1016/j.biochi.2017.03.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/19/2017] [Indexed: 10/19/2022]
Abstract
Sphingosine is a natural sphingolipid found in membranes of all eukaryotic cells. In addition to its functions in cell signaling, sphingosine has broad-spectrum antimicrobial properties. Sphingosine's role as an antimicrobial is important in tissues such as the skin and respiratory epithelium. Reduction in the normal sphingosine level is associated with problems related to infection susceptibility. Therefore, exogenous sphingosine may be an effective antimicrobial therapeutic. Inhaled nebulized sphingosine has been shown to be effective at both preventing and treating pneumonia in multiple mouse models. We now show that inhaled sphingosine has low toxicity to the respiratory system, strengthening its case as an excellent candidate for a novel inhaled antimicrobial drug.
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Affiliation(s)
- Grace E Martin
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA
| | - Ryan M Boudreau
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA
| | - Caroline Couch
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA
| | - Katrin Anne Becker
- Dept. of Molecular Biology, University Hospital Essen, University of Duisburg-Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Michael J Edwards
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA
| | - Charles C Caldwell
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA
| | - Erich Gulbins
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA; Dept. of Molecular Biology, University Hospital Essen, University of Duisburg-Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Aaron Seitz
- Dept. of Surgery, College of Medicine, University of Cincinnati, 231 Albert Sabin Way, ML 0558, Cincinnati, OH 45267, USA.
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The impact of impaired macrophage functions in cystic fibrosis disease progression. J Cyst Fibros 2016; 16:443-453. [PMID: 27856165 DOI: 10.1016/j.jcf.2016.10.011] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 10/21/2016] [Accepted: 10/23/2016] [Indexed: 01/29/2023]
Abstract
The underlying cause of morbidity in cystic fibrosis (CF) is the decline in lung function, which results in part from chronic inflammation. Inflammation and infection occur early in infancy in CF and the role of innate immune defense in CF has been highlighted in the last years. Once thought simply to be consumers of bacteria, macrophages have emerged as highly sensitive immune cells that are located at the balance point between inflammation and resolution of this inflammation in CF pathophysiology. In order to assess the potential role of macrophage in CF, we review the evidence that: (1) CF macrophage has a dysregulated inflammatory phenotype; (2) CF macrophage presents altered phagocytosis capacity and bacterial killing; and (3) lipid disorders in CF macrophage affect its function. These alterations of macrophage weaken innate defense of CF patients and may be involved in CF disease progression and lung damage.
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Aureli M, Schiumarini D, Loberto N, Bassi R, Tamanini A, Mancini G, Tironi M, Munari S, Cabrini G, Dechecchi MC, Sonnino S. Unravelling the role of sphingolipids in cystic fibrosis lung disease. Chem Phys Lipids 2016; 200:94-103. [DOI: 10.1016/j.chemphyslip.2016.08.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/22/2016] [Accepted: 08/25/2016] [Indexed: 12/13/2022]
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Chhuon C, Pranke I, Borot F, Tondelier D, Lipecka J, Fritsch J, Chanson M, Edelman A, Ollero M, Guerrera I. Changes in lipid raft proteome upon TNF-α stimulation of cystic fibrosis cells. J Proteomics 2016; 145:246-253. [DOI: 10.1016/j.jprot.2016.07.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 05/20/2016] [Accepted: 07/03/2016] [Indexed: 01/22/2023]
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Rice TC, Seitz AP, Edwards MJ, Gulbins E, Caldwell CC. Frontline Science: Sphingosine rescues burn-injured mice from pulmonary Pseudomonas aeruginosa infection. J Leukoc Biol 2016; 100:1233-1237. [PMID: 27418352 DOI: 10.1189/jlb.3hi0416-197r] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 06/12/2016] [Accepted: 06/21/2016] [Indexed: 11/24/2022] Open
Abstract
Burn patients with concomitant pulmonary Pseudomonas aeruginosa (PA) infection have mortality rates as high as 50%, despite antibiotic therapy. Sphingosine is generated from ceramide via ceramidase and has been reported to have antimicrobial properties. We observed a reduction in sphingosine and a concurrent increase in ceramide in bronchial epithelial cells after burn injury. After PA inoculation, these mice had a significant decrease in survival compared to noninjured mice. However, when injured mice were pretreated with sphingosine or neutral ceramidase and subsequently infected, mortality and bacterial levels were robustly reduced. We further observed that sphingosine directly kills PA. Together, these results demonstrate that reduction in sphingosine is associated with an increased susceptibility to pulmonary infection after burn injury. Restoration of sphingosine levels through direct sphingosine administration or conversion of the increased ceramide to sphingosine by neutral ceramidase reduces mortality and mitigates pulmonary infection after burn injury.
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Affiliation(s)
- Teresa C Rice
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Aaron P Seitz
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Michael J Edwards
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Erich Gulbins
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio.,Department of Molecular Biology, University of Essen, Essen, Germany; and.,Department of Research, Shriners Hospitals for Children, Cincinnati, Ohio
| | - Charles C Caldwell
- Division of Research, Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio; .,Department of Research, Shriners Hospitals for Children, Cincinnati, Ohio
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Varshney P, Yadav V, Saini N. Lipid rafts in immune signalling: current progress and future perspective. Immunology 2016; 149:13-24. [PMID: 27153983 DOI: 10.1111/imm.12617] [Citation(s) in RCA: 188] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 04/22/2016] [Accepted: 04/28/2016] [Indexed: 12/15/2022] Open
Abstract
Lipid rafts are dynamic assemblies of proteins and lipids that harbour many receptors and regulatory molecules and so act as a platform for signal transduction. They float freely within the liquid-disordered bilayer of cellular membranes and can cluster to form larger ordered domains. Alterations in lipid rafts are commonly found to be associated with the pathogenesis of several human diseases and recent reports have shown that the raft domains can also be perturbed by targeting raft proteins through microRNAs. Over the last few years, the importance of lipid rafts in modulating both innate and acquired immune responses has been elucidated. Various receptors present on immune cells like B cells, T cells, basophils and mast cells associate with lipid rafts on ligand binding and initiate signalling cascades leading to inflammation. Furthermore, disrupting lipid raft integrity alters lipopolysaccharide-induced cytokine secretion, IgE signalling, and B-cell and T-cell activation. The objective of this review is to summarize the recent progress in understanding the role of lipid rafts in the modulation of immune signalling and its related therapeutic potential for autoimmune diseases and inflammatory disorders.
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Affiliation(s)
- Pallavi Varshney
- Functional Genomics Unit, CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB), Delhi, India.,Academy of Scientific & Innovative Research, CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB), Delhi, India
| | - Vikas Yadav
- Functional Genomics Unit, CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB), Delhi, India
| | - Neeru Saini
- Functional Genomics Unit, CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB), Delhi, India.,Academy of Scientific & Innovative Research, CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB), Delhi, India
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Pharmacological targeting of ion channels for cancer therapy: In vivo evidences. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1863:1385-97. [DOI: 10.1016/j.bbamcr.2015.11.032] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 11/25/2015] [Accepted: 11/26/2015] [Indexed: 12/29/2022]
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Abu-Arish A, Pandzic E, Goepp J, Matthes E, Hanrahan JW, Wiseman PW. Cholesterol modulates CFTR confinement in the plasma membrane of primary epithelial cells. Biophys J 2016; 109:85-94. [PMID: 26153705 DOI: 10.1016/j.bpj.2015.04.042] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 04/23/2015] [Indexed: 01/01/2023] Open
Abstract
The cystic fibrosis transmembrane conductance regulator (CFTR) is a plasma-membrane anion channel that, when mutated, causes the disease cystic fibrosis. Although CFTR has been detected in a detergent-resistant membrane fraction prepared from airway epithelial cells, suggesting that it may partition into cholesterol-rich membrane microdomains (lipid rafts), its compartmentalization has not been demonstrated in intact cells and the influence of microdomains on CFTR lateral mobility is unknown. We used live-cell imaging, spatial image correlation spectroscopy, and k-space image correlation spectroscopy to examine the aggregation state of CFTR and its dynamics both within and outside microdomains in the plasma membrane of primary human bronchial epithelial cells. These studies were also performed during treatments that augment or deplete membrane cholesterol. We found two populations of CFTR molecules that were distinguishable based on their dynamics at the cell surface. One population showed confinement and had slow dynamics that were highly cholesterol dependent. The other, more abundant population was less confined and diffused more rapidly. Treatments that deplete the membrane of cholesterol caused the confined fraction and average number of CFTR molecules per cluster to decrease. Elevating cholesterol had the opposite effect, increasing channel aggregation and the fraction of channels displaying confinement, consistent with CFTR recruitment into cholesterol-rich microdomains with dimensions below the optical resolution limit. Viral infection caused the nanoscale microdomains to fuse into large platforms and reduced CFTR mobility. To our knowledge, these results provide the first biophysical evidence for multiple CFTR populations and have implications for regulation of their surface expression and channel function.
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Affiliation(s)
| | - Elvis Pandzic
- Physics, McGill University, Montreal, Quebec, Canada
| | - Julie Goepp
- Physiology, McGill University, Montreal, Quebec, Canada
| | | | | | - Paul W Wiseman
- Chemistry & Physics, McGill University, Montreal, Quebec, Canada.
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Lai CK, Su JC, Lin YH, Chang CS, Feng CL, Lin HJ, Lin CJ, Tseng GC, Liu HH, Hsieh JT, Su HL, Lai CH. Involvement of cholesterol in Campylobacter jejuni cytolethal distending toxin-induced pathogenesis. Future Microbiol 2016; 10:489-501. [PMID: 25865189 DOI: 10.2217/fmb.14.119] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
AIM The aim of this study was to investigate whether cholesterol plays a pivotal role in cytolethal distending toxin (CDT) mediated pathogenic effects in hosts. MATERIALS & METHODS The molecular mechanisms underlying cholesterol sequestering conferred resistance to CDT-induced DNA double-strand breaks (DSBs) and cell cycle arrest were investigated. Histopathological analysis was conducted for evaluating CDT-induced intestinal inflammation in mouse. RESULTS CDT actions were attenuated by treatment of cells with methyl-β-cyclodextrin (MβCD). Severe intestinal inflammation induced by CDT treatment was observed in high-cholesterol diet-fed mice, but not in normal diet-fed mice, indicating that cholesterol is essential for CDT intoxication. CONCLUSION Our findings demonstrate a molecular link between Campylobacter jejuni CDT and cholesterol, which is crucial to facilitate CDT-induced pathogenesis in hosts.
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Affiliation(s)
- Cheng-Kuo Lai
- School of Medicine & Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan
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Lin CJ, Liao WC, Lin HJ, Hsu YM, Lin CL, Chen YA, Feng CL, Chen CJ, Kao MC, Lai CH, Kao CH. Statins Attenuate Helicobacter pylori CagA Translocation and Reduce Incidence of Gastric Cancer: In Vitro and Population-Based Case-Control Studies. PLoS One 2016; 11:e0146432. [PMID: 26730715 PMCID: PMC4701455 DOI: 10.1371/journal.pone.0146432] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Accepted: 12/15/2015] [Indexed: 02/06/2023] Open
Abstract
Gastric cancer is the second leading cause of cancer-related death worldwide. The correlation of Helicobacter pylori and the etiology of gastric cancer was substantially certain. Cholesterol-rich microdomains (also called lipid rafts), which provide platforms for signaling, are associated with H. pylori-induced pathogenesis leading to gastric cancer. Patients who have been prescribed statins, inhibitors of 3-hydroxy-3-methyl glutaryl coenzyme A (HMG-CoA) reductase, have exhibited a reduced risk of several types of cancer. However, no studies have addressed the effect of statins on H. pylori-associated gastric cancer from the antineoplastic perspective. In this study, we showed that treatment of gastric epithelial cells with simvastatin reduced the level of cellular cholesterol and led to attenuation of translocation and phosphorylation of H. pylori cytotoxin-associated gene A (CagA), which is recognized as a major determinant of gastric cancer development. Additionally, a nationwide case-control study based on data from the Taiwanese National Health Insurance Research Database (NHIRD) was conducted. A population-based case-control study revealed that patients who used simvastatin exhibited a significantly reduced risk of gastric cancer (adjusted odds ratio (OR) = 0.76, 95% confidence interval (CI) = 0.70–0.83). In patients exhibiting H. pylori infection who were prescribed simvastatin, the adjusted OR for gastric cancer was 0.25 (95% CI = 0.12–0.50). Our results combined an in vitro study with a nationwide population analysis reveal that statin use might be a feasible approach to prevent H. pylori-associated gastric cancer.
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Affiliation(s)
- Chun-Jung Lin
- Department of Urology, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
- Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan
| | - Wei-Chih Liao
- Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan
- Department of Pulmonary and Critical Care Medicine, China Medical University Hospital, Taichung, Taiwan
| | - Hwai-Jeng Lin
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Taipei Medical University, Shuang-Ho Hospital, New Taipei, Taiwan
| | - Yuan-Man Hsu
- Department of Biological Science and Technology, China Medical University, Taichung, Taiwan
| | - Cheng-Li Lin
- Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan
| | - Yu-An Chen
- Graduate Institute of Basic Medical Science, School of Medicine, China Medical University, Taichung, Taiwan
| | - Chun-Lung Feng
- Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
| | - Chih-Jung Chen
- Division of Paediatric Infectious Diseases, Department of Paediatrics, Chang Gung Children's Hospital and Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Min-Chuan Kao
- Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan, Taiwan
| | - Chih-Ho Lai
- Graduate Institute of Basic Medical Science, School of Medicine, China Medical University, Taichung, Taiwan
- Department of Nursing, Asia University, Taichung, Taiwan
- Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan, Taiwan
- * E-mail: (C-HK); ; (C-HL)
| | - Chia-Hung Kao
- Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan
- Department of Nuclear Medicine, PET Center, China Medical University Hospital, Taichung, Taiwan
- * E-mail: (C-HK); ; (C-HL)
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Chinigarzadeh A, Muniandy S, Salleh N. Estrogen, progesterone, and genistein differentially regulate levels of expression of α-, β-, and γ-epithelial sodium channel (ENaC) and α-sodium potassium pump (Na⁺/K⁺-ATPase) in the uteri of sex steroid-deficient rats. Theriogenology 2015; 84:911-26. [PMID: 26154487 DOI: 10.1016/j.theriogenology.2015.05.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 04/18/2015] [Accepted: 05/28/2015] [Indexed: 12/22/2022]
Abstract
Estrogen, progesterone, and genistein could induce changes in uterine fluid volume and Na(+) concentration. Progesterone upregulates expression of epithelial sodium channel (ENaC) and Na(+)/K(+)-ATPase which contributed toward these changes. However, effects of estrogen and genistein were unknown. This study therefore investigated changes in expression of these proteins in the uterus under estrogen, progesterone, and genistein influences to further understand mechanisms underlying sex steroids and phytoestrogen effects on uterine fluid Na(+) regulation. In this study, uteri of ovariectomized female rats receiving 7-day treatment with genistein (25, 50, and 100 mg/kg/day), estrogen (0.8 × 10(-4) mg/kg/day), or progesterone (4 mg/kg/day) were harvested, and expression levels of α-, β-, and γ-ENaC proteins and messenger RNAs (mRNAs) and α-Na(+)/K(+)-ATPase protein were determined by Western blotting (proteins) and real-time polymerase chain reaction (mRNA). Meanwhile, distribution of α-, β-, and γ-ENaC and α-Na(+)/K(+)-ATPase proteins in the uterus was identified by immunohistochemistry. Our findings indicated that expression of α-, β-, and γ-ENaC proteins and mRNAs and α-Na(+)/K(+)-ATPase protein were enhanced under progesterone influence. Lower expressions were noted under estrogen and genistein influences compared to progesterone. Under estrogen, progesterone, and genistein influences, α- and β-ENaC were distributed at apical membrane and γ-ENaC was distributed at apical and basolateral membranes of uterine luminal epithelia. Under progesterone influence, α-Na(+)/K(+)-ATPase was highly expressed at basolateral membrane. In conclusion, high expression of α-, β-, and γ-ENaC and α-Na(+)/K(+)-ATPase under progesterone influence would contribute toward increased uterine fluid Na(+) reabsorption, whereas lesser expression of these proteins under estrogen and genistein influences would contribute toward lower reabsorption of uterine fluid Na(+).
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Affiliation(s)
- Asma Chinigarzadeh
- Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Sekaran Muniandy
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Naguib Salleh
- Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.
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Shi C, Luo X, Wang J, Long D. Incorporation of β-sitosterol into the membrane prevents tumor necrosis factor-α-induced nuclear factor-κB activation and gonadotropin-releasing hormone decline. Steroids 2015; 96:1-6. [PMID: 25554578 DOI: 10.1016/j.steroids.2014.12.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 08/12/2014] [Accepted: 12/18/2014] [Indexed: 01/11/2023]
Abstract
It has been demonstrated that hypothalamus has a programmatic role in aging development, and this role of hypothalamus is mediated by nuclear factor-κB (NF-κB)-directed gonadotropin-releasing hormone (GnRH) decline. β-Sitosterol (BS), one of the most common phytosterols in the diet, is able to inhibit pro-inflammatory NF-κB signaling. It has been demonstrated that dietary BS can enter the brain and accumulates in brain cell membranes. However, it is unknown whether and how membrane BS affects GnRH release. Using GT1-7 cells, a cell line of GnRH neurons, this study investigated if membrane BS had an influence on GnRH release. It was found that incorporation of BS into the membrane could prevent tumor necrosis factor-α (TNF-α)-induced GnRH decline. The underlying basis involves inhibition of NF-κβ activation via estrogen receptor (ER)-mediated inhibition of inhibitor of nuclear factor κB (Iκβ) processing. These results extend existing data regarding the beneficial effects of BS, and suggest the use of BS-enriched foods as anti-aging nutrients.
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Affiliation(s)
- Chun Shi
- Department of Anatomy, Guangzhou Medical University, Guangzhou, Guangdong 510182, China.
| | - XiuMei Luo
- Department of Anatomy, Guangzhou Medical University, Guangzhou, Guangdong 510182, China
| | - Jisheng Wang
- Department of Anatomy, Guangzhou Medical University, Guangzhou, Guangdong 510182, China
| | - Dahong Long
- Department of Anatomy, Guangzhou Medical University, Guangzhou, Guangdong 510182, China
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Ni I, Ji C, Vij N. Second-hand cigarette smoke impairs bacterial phagocytosis in macrophages by modulating CFTR dependent lipid-rafts. PLoS One 2015; 10:e0121200. [PMID: 25794013 PMCID: PMC4368805 DOI: 10.1371/journal.pone.0121200] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2014] [Accepted: 01/27/2015] [Indexed: 01/08/2023] Open
Abstract
Introduction First/Second-hand cigarette-smoke (FHS/SHS) exposure weakens immune defenses inducing chronic obstructive pulmonary disease (COPD) but the underlying mechanisms are not fully understood. Hence, we evaluated if SHS induced changes in membrane/lipid-raft (m-/r)-CFTR (cystic fibrosis transmembrane conductance regulator) expression/activity is a potential mechanism for impaired bacterial phagocytosis in COPD. Methods RAW264.7 murine macrophages were exposed to freshly prepared CS-extract (CSE) containing culture media and/or Pseudomonas-aeruginosa-PA01-GFP for phagocytosis (fluorescence-microscopy), bacterial survival (colony-forming-units-CFU), and immunoblotting assays. The CFTR-expression/activity and lipid-rafts were modulated by transient-transfection or inhibitors/inducers. Next, mice were exposed to acute/sub-chronic-SHS or room-air (5-days/3-weeks) and infected with PA01-GFP, followed by quantification of bacterial survival by CFU-assay. Results We investigated the effect of CSE treatment on RAW264.7 cells infected by PA01-GFP and observed that CSE treatment significantly (p<0.01) inhibits PA01-GFP phagocytosis as compared to the controls. We also verified this in murine model, exposed to acute/sub-chronic-SHS and found significant (p<0.05, p<0.02) increase in bacterial survival in the SHS-exposed lungs as compared to the room-air controls. Next, we examined the effect of impaired CFTR ion-channel-activity on PA01-GFP infection of RAW264.7 cells using CFTR172-inhibitor and found no significant change in phagocytosis. We also similarly evaluated the effect of a CFTR corrector-potentiator compound, VRT-532, and observed no significant rescue of CSE impaired PA01-GFP phagocytosis although it significantly (p<0.05) decreases CSE induced bacterial survival. Moreover, induction of CFTR expression in macrophages significantly (p<0.03) improves CSE impaired PA01-GFP phagocytosis as compared to the control. Next, we verified the link between m-/r-CFTR expression and phagocytosis using methyl-β-cyclodextran (CD), as it is known to deplete CFTR from membrane lipid-rafts. We observed that CD treatment significantly (p<0.01) inhibits bacterial phagocytosis in RAW264.7 cells and adding CSE further impairs phagocytosis suggesting synergistic effect on CFTR dependent lipid-rafts. Conclusion Our data suggest that SHS impairs bacterial phagocytosis by modulating CFTR dependent lipid-rafts.
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Affiliation(s)
- Inzer Ni
- Department of Pediatric Respiratory Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Changhoon Ji
- Department of Pediatric Respiratory Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Neeraj Vij
- Department of Pediatric Respiratory Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- Department of Foundational Sciences, College of Medicine, Central Michigan University, Mount Pleasant, Michigan, United States of America
- * E-mail:
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Dare K, Shepherd J, Roy H, Seveau S, Ibba M. LysPGS formation in Listeria monocytogenes has broad roles in maintaining membrane integrity beyond antimicrobial peptide resistance. Virulence 2014; 5:534-46. [PMID: 24603093 DOI: 10.4161/viru.28359] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Listeria monocytogenes is an intracellular, foodborne gastrointestinal pathogen that is primarily responsible for causing listeriosis or food poisoning in otherwise healthy individuals. Infections that arise during pregnancy or within immune compromised individuals are much more serious resulting in the risk of fetal termination or fetal fatality postpartum in the former and septicemia or meningitis with a 20% fatality rate in the latter. While the roles of internalin proteins and listeriolysin-O in the infection process are well characterized, the specific roles of lysine-modified phospholipids in the membrane of L. monocytogenes are not. Investigation into the lipid bilayer composition of L. monocytogenes indicated that the overall proportions of lipids, including lysylcardiolipin and lysylphosphatidylglycerol (LysPG), vary with growth temperature and growth phase. In addition, we demonstrate that LysPG formation is essential for L. monocytogenes survival in the presence of increased osmolytic stress but has no effect on bacterial adherence, invasion or survival in the presence of physiologically relevant concentrations of human neutrophil peptide (HNP-1). In the absence of LysPG synthesis, L. monocytogenes unexpectedly retained flagellum-mediated motility at 37 °C. Taken together, these findings show that LysPG formation in L. monocytogenes has broader functions in virulence and survival beyond its known role in the modification of membrane potential previously observed in other bacteria.
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Affiliation(s)
- Kiley Dare
- Department of Microbiology; The Ohio State University; Columbus, OH USA
| | - Jennifer Shepherd
- Department of Microbiology; The Ohio State University; Columbus, OH USA
| | - Hervé Roy
- Department of Microbiology; The Ohio State University; Columbus, OH USA
| | - Stephanie Seveau
- Department of Microbiology; The Ohio State University; Columbus, OH USA
| | - Michael Ibba
- Department of Microbiology; The Ohio State University; Columbus, OH USA; Ohio State Biochemistry Program; Center for RNA Biology; The Ohio State University; Columbus, OH USA
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Becker KA, Henry B, Ziobro R, Riethmüller J, Gulbins E. Lipids in cystic fibrosis. Expert Rev Respir Med 2014; 5:527-35. [DOI: 10.1586/ers.11.36] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Caretti A, Bragonzi A, Facchini M, De Fino I, Riva C, Gasco P, Musicanti C, Casas J, Fabriàs G, Ghidoni R, Signorelli P. Anti-inflammatory action of lipid nanocarrier-delivered myriocin: therapeutic potential in cystic fibrosis. Biochim Biophys Acta Gen Subj 2013; 1840:586-94. [PMID: 24141140 DOI: 10.1016/j.bbagen.2013.10.018] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 09/07/2013] [Accepted: 10/10/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND Sphingolipids take part in immune response and can initiate and/or sustain inflammation. Various inflammatory diseases have been associated with increased ceramide content, and pharmacological reduction of ceramide diminishes inflammation damage in vivo. Inflammation and susceptibility to microbial infection are two elements in a vicious circle. Recently, sphingolipid metabolism inhibitors were used to reduce infection. Cystic fibrosis (CF) is characterized by a hyper-inflammation and an excessive innate immune response, which fails to evolve into adaptive immunity and to eradicate infection. Chronic infections result in lung damage and patient morbidity. Notably, ceramide content in mucosa airways is higher in CF mouse models and in patients than in control mice or healthy subjects. METHODS The therapeutic potential of myriocin, an inhibitor of the sphingolipid de novo synthesis rate limiting enzyme (Serine Palmitoyl Transferase, SPT),was investigated in CF cells and mice models. RESULTS We treated CF human respiratory epithelial cells with myriocin, This treatment resulted in reduced basal, as well as TNFα-stimulated, inflammation. In turn, TNFα induced an increase in SPT in these cells, linking de novo synthesis of ceramide to inflammation. Furthermore, myriocin-loaded nanocarrier, injected intratrachea prior to P. aeruginosa challenge, enabled a significant reduction of lung infection and reduced inflammation. CONCLUSIONS The presented data suggest that de novo ceramide synthesis is constitutively enhanced in CF mucosa and that it can be envisaged as pharmacological target for modulating inflammation and restoring effective innate immunity against acute infection. GENERAL SIGNIFICANCE Myriocin stands as a powerful immunomodulatory agent for inflammatory and infectious diseases.
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Affiliation(s)
- Anna Caretti
- Department of Health Sciences, University of Milan, San Paolo Hospital, Italy
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Constantinescu AA, Gleizes C, Alhosin M, Yala E, Zobairi F, Leclercq A, Stoian G, Mitrea IL, Prévost G, Toti F, Kessler L. Exocrine cell-derived microparticles in response to lipopolysaccharide promote endocrine dysfunction in cystic fibrosis. J Cyst Fibros 2013; 13:219-26. [PMID: 24095207 DOI: 10.1016/j.jcf.2013.08.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 08/26/2013] [Accepted: 08/30/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND Diabetes in cystic fibrosis (CF) is a result of exocrine pancreas alteration followed by endocrine dysfunction at a later stage. Microparticles (MPs) are plasma membrane fragments shed from stimulated or damaged cells that act as cellular effectors. Our aim was to identify a new form of interaction between exocrine and endocrine pancreatic cells mediated by exocrine MPs, in the context of recurrent infection in CF. METHODS MPs from either human exocrine CFTRΔF508-mutated (CFPAC-1) cells or exocrine normal pancreatic (PANC-1) cells were collected after treatment by LPS from Pseudomonas aeruginosa and applied to rat endocrine normal insulin-secreting RIN-m5F cells. MP membrane integration in target cells was established by confocal microscopy and flow cytometry using PKH26 lipid probe. Apoptosis, lysosomal activity, insulin secretion were measured after 18 h. MP-mediated NF-κB activation was measured in HEK-Blue reporter cells by SEAP reporter gene system and in RIN-m5F cells by Western blot. In endocrine normal cells, CFTR inhibition was achieved using Inhibitor-172. RESULTS Compared to PANC-1, MPs from CFPAC-1 significantly reduced insulin secretion and lysosomal activity in RIN-m5F. MPs induced NF-κB activation by increasing the level of IκB phosphorylation. Moreover, the inhibition of NF-κB activation using specific inhibitors was associated with a restored insulin secretion. Interestingly, CFTR inhibition in normal RIN-m5F cells promoted apoptosis and decreased insulin secretion. CONCLUSIONS During recurrent infections associated with CF, exocrine MPs may contribute to endocrine cell dysfunction via NF-κB pathways. Membrane CFTR dysfunction is associated with decreased insulin secretion.
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Affiliation(s)
- Andrei Alexandru Constantinescu
- EA7293, Vascular and Tissular Stress in Transplantation, Federation of Translational Medicine of Strasbourg, Faculty of Medicine, University of Strasbourg, 74 route du Rhin, F-67401 Illkirch, Strasbourg, France; Department of Parasitology and Parasitic Diseases and Animal Biology, Faculty of Veterinary Medicine, University of Agronomical Sciences and Veterinary Medicine, 105 spl. Independentei, sector 5, 050097 Bucharest, Romania
| | - Céline Gleizes
- EA7293, Vascular and Tissular Stress in Transplantation, Federation of Translational Medicine of Strasbourg, Faculty of Medicine, University of Strasbourg, 74 route du Rhin, F-67401 Illkirch, Strasbourg, France
| | - Mahmoud Alhosin
- UMR7213 CNRS, Laboratory of Biophotonics and Pharmacology, 74 route du Rhin, F-67401 Illkirch, France
| | - Elhassan Yala
- EA7293, Vascular and Tissular Stress in Transplantation, Federation of Translational Medicine of Strasbourg, Faculty of Medicine, University of Strasbourg, 74 route du Rhin, F-67401 Illkirch, Strasbourg, France
| | - Fatiha Zobairi
- EA7293, Vascular and Tissular Stress in Transplantation, Federation of Translational Medicine of Strasbourg, Faculty of Medicine, University of Strasbourg, 74 route du Rhin, F-67401 Illkirch, Strasbourg, France
| | - Alexandre Leclercq
- Department of Pneumology, University Hospital, 1 place de L'hôpital, CHU de Strasbourg, BP426, 67091 Strasbourg Cedex, France
| | - Gheorghe Stoian
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 spl. Independentei, sector 5, 050095 Bucharest, Romania
| | - Ioan Liviu Mitrea
- Department of Parasitology and Parasitic Diseases and Animal Biology, Faculty of Veterinary Medicine, University of Agronomical Sciences and Veterinary Medicine, 105 spl. Independentei, sector 5, 050097 Bucharest, Romania
| | - Gilles Prévost
- EA7290 Early Bacterial Virulence, Faculty of Medicine, University of Strasbourg, 3 rue Koeberlé, F-67000 Strasbourg, France
| | - Florence Toti
- UMR7213 CNRS, Laboratory of Biophotonics and Pharmacology, 74 route du Rhin, F-67401 Illkirch, France; Faculty of Pharmacy, University of Strasbourg, 74 route du Rhin, F-67401 Illkirch, France
| | - Laurence Kessler
- EA7293, Vascular and Tissular Stress in Transplantation, Federation of Translational Medicine of Strasbourg, Faculty of Medicine, University of Strasbourg, 74 route du Rhin, F-67401 Illkirch, Strasbourg, France; Department of Diabetology, University Hospital, 1 place de l'Hôpital, CHU de Strasbourg, BP421, 67091 Strasbourg Cedex, France.
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WANG JISHENG, WU FENGMING, SHI CHUN. Substitution of membrane cholesterol with β-sitosterol promotes nonamyloidogenic cleavage of endogenous amyloid precursor protein. Neuroscience 2013; 247:227-33. [DOI: 10.1016/j.neuroscience.2013.05.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Revised: 05/02/2013] [Accepted: 05/14/2013] [Indexed: 10/26/2022]
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Shi C, Wu F, Zhu XC, Xu J. Incorporation of beta-sitosterol into the membrane increases resistance to oxidative stress and lipid peroxidation via estrogen receptor-mediated PI3K/GSK3beta signaling. Biochim Biophys Acta Gen Subj 2013; 1830:2538-44. [PMID: 23266618 DOI: 10.1016/j.bbagen.2012.12.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 12/10/2012] [Accepted: 12/12/2012] [Indexed: 12/25/2022]
Abstract
BACKGROUND Brain lipid peroxidation has long been considered a potential therapeutic target for Alzheimer's disease (AD). beta-sitosterol (BS), a plant sterol that is prevalent in plant plasma membrane, has been suggested to have antioxidant activity. Previous studies have demonstrated that dietary BS can enter the brain and accumulates in the plasma membrane of brain cells. However, it is unknown whether and how BS exerts its antioxidant activity in plasma membrane. METHODS To incorporate BS into the plasma membrane in vitro, HT22 cells and primarily cultured hippocampal cells were supplemented with BS using 2-hydroxypropyl-beta-cyclodextrin (HPbetaCD) as a carrier. The present study then tested the antioxidant effect of membrane BS against glucose oxidase (GOX)-induced oxidative stress and lipid peroxidation, and whether the antioxidant effect of membrane BS was associated with estrogen receptor (ER)-mediated phosphatidyl inositol 3-kinase (PL3K)/glycogen synthase kinase 3 (GSK3beta) signaling. RESULTS Incorporation of BS into cell membrane prevented GOX-induced oxidative stress and lipid peroxidation, which could be suppressed by the ER antagonists and PI3K inhibitor. Additional experiments showed that incorporation of BS into cell membrane induced an up-regulation of PI3K activity and a recruitment of PI3K to lipid rafts, which could be inhibited by the ER antagonist. Membrane BS also increased the expression of p-GSK3beta, which could be suppressed in the presence of the ER antagonist and PI3K inhibitor. GENERAL SIGNIFICANCE Given that BS is prevalent in foods such as plant oil, the results provide a better understanding of the beneficial effects of these BS-enriched nutrients on neurodegenerative diseases such as AD.
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Affiliation(s)
- Chun Shi
- Department of Anatomy, Guangzhou Medical University, Guangzhou 510182, China
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Lysine trimethylation of EF-Tu mimics platelet-activating factor to initiate Pseudomonas aeruginosa pneumonia. mBio 2013; 4:e00207-13. [PMID: 23653444 PMCID: PMC3663188 DOI: 10.1128/mbio.00207-13] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Pseudomonas aeruginosa is a ubiquitous microorganism and the most common Gram-negative bacterium associated with nosocomial pneumonia, which is a leading cause of mortality among critically ill patients. Although many virulence factors have been identified in this pathogen, little is known about the bacterial components required to initiate infection in the host. Here, we identified a unique trimethyl lysine posttranslational modification of elongation factor Tu as a previously unrecognized bacterial ligand involved in early host colonization by P. aeruginosa. This modification is carried out by a novel methyltransferase, here named elongation factor Tu-modifying enzyme, resulting in a motif that is a structural mimic of the phosphorylcholine present in platelet-activating factor. This novel motif mediates bacterial attachment to airway respiratory cells through platelet-activating factor receptor and is a major virulence factor, expression of which is a prerequisite to pneumonia in a murine model of respiratory infection. Phosphorylcholine is an interesting molecule from the microbiological and immunological point of view. It is a crucial epitope for the virulence of many important human pathogens, modulates the host immune response, and is involved in a wide number of processes ranging from allergy to inflammation. Our current work identifies a novel bacterial surface epitope structurally and functionally similar to phosphorylcholine. This novel epitope is crucial for initial colonization of the respiratory tract by Pseudomonas aeruginosa and for development of pneumonia. This opens up new targets for the development of novel drugs to prevent P. aeruginosa pneumonia, which is particularly important given the frequent emergence of multidrug-resistant strains.
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Lai CH, Hsu YM, Wang HJ, Wang WC. Manipulation of host cholesterol by Helicobacter pylori for their beneficial ecological niche. Biomedicine (Taipei) 2013. [DOI: 10.1016/j.biomed.2012.12.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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Contribution of α7 nicotinic receptor to airway epithelium dysfunction under nicotine exposure. Proc Natl Acad Sci U S A 2013; 110:4099-104. [PMID: 23431157 DOI: 10.1073/pnas.1216939110] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Loss or dysfunction of the cystic fibrosis (CF) transmembrane conductance regulator (CFTR) leads to impairment of airway mucus transport and to chronic lung diseases resulting in progressive respiratory failure. Nicotinic acetylcholine receptors (nAChRs) bind nicotine and nicotine-derived nitrosamines and thus mediate many of the tobacco-related deleterious effects in the lung. Here we identify α7 nAChR as a key regulator of CFTR in the airways. The airway epithelium in α7 knockout mice is characterized by a higher transepithelial potential difference, an increase of amiloride-sensitive apical Na(+) absorption, a defective cAMP-dependent Cl(-) conductance, higher concentrations of Na(+), Cl(-), K(+), and Ca(2+) in secretions, and a decreased mucus transport, all relevant to a deficient CFTR activity. Moreover, prolonged nicotine exposure mimics the absence of α7 nAChR in mice or its inactivation in vitro in human airway epithelial cell cultures. The functional coupling of α7 nAChR to CFTR occurs through Ca(2+) entry and activation of adenylyl cyclases, protein kinase A, and PKC. α7 nAChR, CFTR, and adenylyl cyclase-1 are physically and functionally associated in a macromolecular complex within lipid rafts at the apical membrane of surface and glandular airway epithelium. This study establishes the potential role of α7 nAChR in the regulation of CFTR function and in the pathogenesis of smoking-related chronic lung diseases.
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Beaudoin T, LaFayette S, Roussel L, Bérubé J, Desrosiers M, Nguyen D, Rousseau S. The level of p38α mitogen-activated protein kinase activation in airway epithelial cells determines the onset of innate immune responses to planktonic and biofilm Pseudomonas aeruginosa. J Infect Dis 2013; 207:1544-55. [PMID: 23402824 DOI: 10.1093/infdis/jit059] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Biofilm microcolonies of Pseudomonas aeruginosa chronically infect the airways of patients with cystic fibrosis and fuel ongoing destructive inflammation, yet the impact of the switch from planktonic to biofilm growth on host responses is poorly understood. We report that in airway epithelial cells a threshold of p38α mitogen-activated protein kinase (MAPK) activation was required to trigger neutrophil recruitment, which is influenced by extrinsic and intrinsic factors. Planktonic P. aeruginosa diffusible material (PsaDM) induced stronger p38α MAPK activation as compared to biofilm PsaDM. Biofilm PsaDM activated p38α MAPK in a Toll-like receptor-independent fashion via the lasI/lasR quorum-sensing system, but this activation was insufficient to recruit neutrophils. However, in airway epithelial cells from patients with cystic fibrosis with hypersensitivity to injurious stimuli, biofilm PsaDM activated p38α MAPK strongly enough to recruit neutrophils, which can contribute to lung injury.
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Abstract
Ceramide is released from sphingomyelin primarily by the activity of acid, neutral, or alkaline sphingomyelinases or is synthesized de novo. Several bacteria, viruses, and even parasites infect mammalian cells by exploiting the acid sphingomyelinase or the neutral sphingomyelinase-ceramide system, or both. Sphingomyelinases and ceramide have been shown to be crucially involved in the internalization of pathogens, the induction of apoptosis in infected cells, the intracellular activation of signaling pathways, and the release of cytokines. The diverse functions of ceramide in infections suggest that the sphingomyelinase-ceramide system is a key player in the host response to many pathogens.
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Abstract
Cystic fibrosis is caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) molecule; these mutations result in a defect in chloride secretion in epithelial cell layers. The disease is characterized by severe gastrointestinal and pulmonary symptoms, but it is the pulmonary symptoms that dominate the clinical course of the disease and determine patients' life expectancy. These pulmonary symptoms include reduced mucociliary clearance, chronic inflammation, and recurrent and chronic pulmonary infections with Pseudomonas aeruginosa, Staphylococcus aureus, Burkholderia cepacia, and Haemophilus influenzae. Recent studies have shown that sphingolipids, especially ceramide, play a crucial role in the pathogenesis of cystic fibrosis. These studies have demonstrated that ceramide accumulates in the lungs of cystic fibrosis patients and mice, causing inflammation and high susceptibility to bacterial infections. The results of initial clinical studies suggest that interfering with sphingolipids may be a novel treatment strategy for cystic fibrosis.
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Affiliation(s)
- Heike Grassmé
- Department of Molecular Biology, University of Duisburg-Essen, Essen, Germany
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Microparticle-mediated transfer of the viral receptors CAR and CD46, and the CFTR channel in a CHO cell model confers new functions to target cells. PLoS One 2012; 7:e52326. [PMID: 23284987 PMCID: PMC3527531 DOI: 10.1371/journal.pone.0052326] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 11/12/2012] [Indexed: 12/11/2022] Open
Abstract
Cell microparticles (MPs) released in the extracellular milieu can embark plasma membrane and intracellular components which are specific of their cellular origin, and transfer them to target cells. The MP-mediated, cell-to-cell transfer of three human membrane glycoproteins of different degrees of complexity was investigated in the present study, using a CHO cell model system. We first tested the delivery of CAR and CD46, two monospanins which act as adenovirus receptors, to target CHO cells. CHO cells lack CAR and CD46, high affinity receptors for human adenovirus serotype 5 (HAdV5), and serotype 35 (HAdV35), respectively. We found that MPs derived from CHO cells (MP-donor cells) constitutively expressing CAR (MP-CAR) or CD46 (MP-CD46) were able to transfer CAR and CD46 to target CHO cells, and conferred selective permissiveness to HAdV5 and HAdV35. In addition, target CHO cells incubated with MP-CD46 acquired the CD46-associated function in complement regulation. We also explored the MP-mediated delivery of a dodecaspanin membrane glycoprotein, the CFTR to target CHO cells. CFTR functions as a chloride channel in human cells and is implicated in the genetic disease cystic fibrosis. Target CHO cells incubated with MPs produced by CHO cells constitutively expressing GFP-tagged CFTR (MP-GFP-CFTR) were found to gain a new cellular function, the chloride channel activity associated to CFTR. Time-course analysis of the appearance of GFP-CFTR in target cells suggested that MPs could achieve the delivery of CFTR to target cells via two mechanisms: the transfer of mature, membrane-inserted CFTR glycoprotein, and the transfer of CFTR-encoding mRNA. These results confirmed that cell-derived MPs represent a new class of promising therapeutic vehicles for the delivery of bioactive macromolecules, proteins or mRNAs, the latter exerting the desired therapeutic effect in target cells via de novo synthesis of their encoded proteins.
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Fine-Coulson K, Reaves BJ, Karls RK, Quinn FD. The role of lipid raft aggregation in the infection of type II pneumocytes by Mycobacterium tuberculosis. PLoS One 2012; 7:e45028. [PMID: 23024786 PMCID: PMC3443240 DOI: 10.1371/journal.pone.0045028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Accepted: 08/11/2012] [Indexed: 11/18/2022] Open
Abstract
Dynamic, cholesterol-dense regions of the plasma membrane, known as lipid rafts (LR), have been observed to develop during and may be directly involved in infection of host cells by various pathogens. This study focuses on LR aggregation induced in alveolar epithelial cells during infection with Mycobacterium tuberculosis (Mtb) bacilli. We report dose- and time-dependent increases in LR aggregation after infection with three different strains at multiplicities of infection of 1, 10 and 100 from 2-24 hr post infection (hpi). Specific strain-dependent variations were noted among H37Rv, HN878 and CDC1551 with H37Rv producing the most significant increase from 15 aggregates per cell (APC) to 27 APC at MOI 100 during the 24 hour infection period. Treatment of epithelial cells with Culture Filtrate Protein, Total Lipids and gamma-irradiated whole cells from each strain failed to induce the level of LR aggregation observed during infection with any of the live strains. However, filtered supernatants from infected epithelial cells did produce comparable LR aggregation, suggesting a secreted mycobacterial product produced during infection of host cells is responsible for LR aggregation. Disruption of lipid raft formation prior to infection indicates that Mtb bacilli utilize LR aggregates for internalization and survival in epithelial cells. Treatment of host cells with the LR-disruption agent Filipin III produced a nearly 22% reduction in viable bacteria for strains H37Rv and HN878, and a 7% reduction for strain CDC1551 after 6 hpi. This study provides evidence for significant mycobacterial-induced changes in the plasma membrane of alveolar epithelial cells and that Mtb strains vary in their ability to facilitate aggregation and utilization of LR.
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Affiliation(s)
- Kari Fine-Coulson
- Department of Infectious Diseases, University of Georgia, Athens, Georgia, United States of America
| | - Barbara J. Reaves
- Department of Infectious Diseases, University of Georgia, Athens, Georgia, United States of America
| | - Russell K. Karls
- Department of Infectious Diseases, University of Georgia, Athens, Georgia, United States of America
| | - Frederick D. Quinn
- Department of Infectious Diseases, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
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Guo Q, Shen N, Yuan K, Li J, Wu H, Zeng Y, Fox J, Bansal AK, Singh BB, Gao H, Wu M. Caveolin-1 plays a critical role in host immunity against Klebsiella pneumoniae by regulating STAT5 and Akt activity. Eur J Immunol 2012; 42:1500-11. [PMID: 22678904 DOI: 10.1002/eji.201142051] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Caveolin-1 (Cav1) is a structural protein of caveolae. Although Cav1 is associated with certain bacterial infections, it is unknown whether Cav1 is involved in host immunity against Klebsiella pneumoniae, the third most commonly isolated microorganism from bacterial sepsis patients. Here, we showed that cav1 knockout mice succumbed to K. pneumoniae infection with markedly decreased survival rates, increased bacterial burdens, intensified tissue injury, hyperactive proinflammatory cytokines, and systemic bacterial dissemination as compared with WT mice. Knocking down Cav1 by a dominant negative approach in lung epithelial MLE-12 cells resulted in similar outcomes (decreased bacterial clearance and increased proinflammatory cytokine production). Furthermore, we revealed that STAT5 influences the GSK3β-β-catenin-Akt pathway, which contributes to the intensive inflammatory response and rapid infection dissemination seen in Cav1 deficiency. Collectively, our findings indicate that Cav1 may offer resistance to K. pneumoniae infection, by affecting both systemic and local production of proinflammatory cytokines via the actions of STAT5 and the GSK3β-β-catenin-Akt pathway.
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Affiliation(s)
- Qiang Guo
- Department of Biochemistry and Molecular Biology, University of North Dakota, Grand Forks, North Dakota 58203, USA
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