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Soni SS, Kim KM, Sarkar B, Rodell CB. Uptake of Cyclodextrin Nanoparticles by Macrophages is Dependent on Particle Size and Receptor-Mediated Interactions. ACS APPLIED BIO MATERIALS 2024; 7:4856-4866. [PMID: 38231485 PMCID: PMC11252246 DOI: 10.1021/acsabm.3c00985] [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: 01/18/2024]
Abstract
Physiochemical properties of nanoparticles, such as their size and chemical composition, dictate their interaction with professional phagocytes of the innate immune system. Macrophages, in particular, are key regulators of the immune microenvironment that heavily influence particle biodistribution as a result of their uptake. This attribute enables macrophage-targeted delivery, including for phenotypic modulation. Saccharide-based materials, including polyglucose polymers and nanoparticles, are efficient vehicles for macrophage-targeted delivery. Here, we investigate the influence of particle size on cyclodextrin nanoparticle (CDNP) uptake by macrophages and further examine the receptor-mediated interactions that drive macrophage-targeted delivery. We designed and synthesized CDNPs ranging in size from 25 nm to >100 nm in diameter. Increasing particle size was correlated with greater uptake by macrophages in vitro. Both scavenger receptor A1 and mannose receptor were critical mediators of macrophage-targeted delivery, inhibition of which reduced the extent of uptake. Finally, we investigated the cellular bioavailability of drug-loaded CDNPs using a model anti-inflammatory drug, celastrol, which demonstrated that drug bioactivity is improved by CDNP loading relative to free drug alone. This study thus elucidates the interactions between the polyglucose nanoparticles and macrophages, thereby facilitating their application in macrophage-targeted drug delivery that has applications in the context of tissue injury and repair.
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Affiliation(s)
- Shreya S Soni
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Kenneth M Kim
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
- Department of Microbiology and Immunology, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Biplab Sarkar
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Christopher B Rodell
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, Pennsylvania 19104, United States
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2
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Brambillasca S, Cera MR, Andronache A, Dey SK, Fagá G, Fancelli D, Frittoli E, Pasi M, Robusto M, Varasi M, Scita G, Mercurio C. Novel selective inhibitors of macropinocytosis-dependent growth in pancreatic ductal carcinoma. Biomed Pharmacother 2024; 177:116991. [PMID: 38906021 PMCID: PMC11287759 DOI: 10.1016/j.biopha.2024.116991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 06/12/2024] [Accepted: 06/15/2024] [Indexed: 06/23/2024] Open
Abstract
Macropinocytosis is a cellular process that enables cells to engulf extracellular material, such as nutrients, growth factors, and even whole cells. It is involved in several physiological functions as well as pathological conditions. In cancer cells, macropinocytosis plays a crucial role in promoting tumor growth and survival under nutrient-limited conditions. In particular KRAS mutations have been identified as main drivers of macropinocytosis in pancreatic, breast, and non-small cell lung cancers. We performed a high-content screening to identify inhibitors of macropinocytosis in pancreatic ductal adenocarcinoma (PDAC)-derived cells, aiming to prevent nutrient scavenging of PDAC tumors. The screening campaign was conducted in a well-known pancreatic KRAS-mutated cell line (MIAPaCa-2) cultured under nutrient deprivation and using FITC-dextran to precisely quantify macropinocytosis. We assembled a collection of 3584 small molecules, including drugs approved by the Food and Drug Administration (FDA), drug-like molecules against molecular targets, kinase-targeted compounds, and molecules designed to hamper protein-protein interactions. We identified 28 molecules that inhibited macropinocytosis, with potency ranging from 0.4 to 29.9 μM (EC50). A few of them interfered with other endocytic pathways, while 11 compounds did not and were therefore considered specific "bona fide" macropinocytosis inhibitors and further characterized. Four compounds (Ivermectin, Tyrphostin A9, LY2090314, and Pyrvinium Pamoate) selectively hampered nutrient scavenging in KRAS-mutated cancer cells. Their ability to impair albumin-dependent proliferation was replicated both in different 2D cell culture systems and 3D organotypic models. These findings provide a new set of compounds specifically targeting macropinocytosis, which could have therapeutic applications in cancer and infectious diseases.
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Affiliation(s)
- Silvia Brambillasca
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy.
| | - Maria Rosaria Cera
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Adrian Andronache
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Sumit Kumar Dey
- IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Giovanni Fagá
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Daniele Fancelli
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | | | - Maurizio Pasi
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Michela Robusto
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Mario Varasi
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy
| | - Giorgio Scita
- IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy; Department of Oncology and Haemato-Oncology, University of Milan, Milan, Italy.
| | - Ciro Mercurio
- Experimental Therapeutics Program, IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy.
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3
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Yau E, Yang L, Chen Y, Umstead TM, Stanley AE, Halstead ES, Gandhi CK, Yewdell JW, Chroneos ZC. SP-R210 isoforms of Myosin18A modulate endosomal sorting and recognition of influenza A virus infection in macrophages. Microbes Infect 2024; 26:105280. [PMID: 38135024 PMCID: PMC10948314 DOI: 10.1016/j.micinf.2023.105280] [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: 05/28/2023] [Revised: 12/12/2023] [Accepted: 12/17/2023] [Indexed: 12/24/2023]
Abstract
Influenza A virus (IAV) infection causes acute and often lethal inflammation in the lung. The role of macrophages in this adverse inflammation is partially understood. The surfactant protein A receptor 210 (SP-R210) consists of two isoforms, a long (L) SP-R210L and a short (S) SP-R210S isoform encoded by alternative splicing of the myosin 18A gene. We reported that disruption of SP-R210L enhances cytosolic and endosomal antiviral response pathways. Here, we report that SP-R210L antagonizes type I interferon β (IFNβ), as depletion of SP-R210L potentiates IFNβ secretion. SP-R210 antibodies enhance and attenuate IFNβ secretion in SP-R210L replete and deficient macrophages, respectively, indicating that SP-R210 isoform stoichiometry alters macrophage function intrinsically. This reciprocal response is coupled to unopposed and restricted expression of viral genes in control and SP-R210L-deficient macrophages, respectively. Human monocytic cells with sub-stoichiometric expression of SP-R210L resist IAV infection, whereas alveolar macrophages with increased abundance of SP-R210L permit viral gene expression similar to murine macrophages. Uptake and membrane binding studies show that lack of SP-R210 isoforms does not impair IAV binding and internalization. Lack of SP-R210L, however, results in macropinocytic retention of the virus that depends on both SP-R210S and interferon-inducible transmembrane protein-3 (IFITM3). Mass spectrometry and Western blot analyses indicate that SP-R210 isoforms modulate differential recruitment of the Rho-family GTPase RAC1 and guanine nucleotide exchange factors. Our study suggests that SP-R210 isoforms modulate RAC-dependent macropinosomal sorting of IAV to discrete endosomal and lysosomal compartments that either permit or prevent endolysosomal escape and inflammatory sensing of viral genomes in macrophages.
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Affiliation(s)
- Eric Yau
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Linlin Yang
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Yan Chen
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Todd M Umstead
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Anne E Stanley
- Mass Spectrometry Core, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - E Scott Halstead
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA; Department of Pediatrics, Division of Pediatric Critical Care Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Chintan K Gandhi
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Jonathan W Yewdell
- Cellular Biology Section, Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD, USA
| | - Zissis C Chroneos
- Department of Pediatrics, Division of Perinatal-Neonatal Medicine, Pulmonary Immunology and Physiology Laboratory, Pennsylvania State University College of Medicine, Hershey, PA, USA; Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA, USA.
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4
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Deisl C, Moe OW, Hilgemann DW. Constitutive Plasma Membrane Turnover in T-REx293 cells via Ordered Membrane Domain Endocytosis under Mitochondrial Control. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.17.576124. [PMID: 38293164 PMCID: PMC10827192 DOI: 10.1101/2024.01.17.576124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Clathrin/dynamin-independent endocytosis of ordered plasma membrane domains (ordered membrane domain endocytosis, OMDE) can become massive in response to cytoplasmic Ca elevations, G protein activation by non-hydrolyzable GTP analogs, and enhanced oxidative metabolism. In patch-clamped murine bone marrow macrophages (BMMs), cytoplasmic succinate and pyruvate, but not β-hydroxybutyrate, induce OMDE of 75% of the plasma membrane within 2 min. The responses require palmitoylation of membrane proteins, being decreased by 70% in BMMs lacking the acyltransferase, DHHC5, by treatment with carnitine to shift long-chain acyl groups from cytoplasmic to mitochondrial acyl-CoAs, by bromopalmitate/albumin complexes to block DHHCs, and by the mitochondria-specific cyclosporin, NIM811, to block permeability transition pores that may release mitochondrial coenzyme A into the cytoplasm. Using T-REx293 cells, OMDE amounts to 40% with succinate, pyruvate, or GTPγS, and it is inhibited by actin cytoskeleton disruption. Pyruvate-induced OMDE is blocked by the hydrophobic antioxidant, edaravone, which prevents permeability transition pore openings. Using fluorescent 3kD dextrans to monitor endocytosis, OMDE appears to be constitutively active in T-REx293 cells but not in BMMs. After 1 h without substrates or bicarbonate, pyruvate and hydroxybutyrate inhibit constitutive OMDE, as expected for a shift of CoA from long-chain acyl-CoAs to other CoA metabolites. In the presence of bicarbonate, pyruvate strongly enhances OMDE, which is then blocked by β-hydroxybutyrate, bromopalmitate/albumin complexes, cyclosporines, or edaravone. After pyruvate responses, T-REx293 cells grow normally with no evidence for apoptosis. Fatty acid-free albumin (15 μM) inhibits basal OMDE in T-REx293 cells, as do cyclosporines, carnitine, and RhoA blockade. Surprisingly, OMDE in the absence of substrates and bicarbonate is not inhibited by siRNA knockdown of the acyltransferases, DHHC5 or DHHC2, which are required for activated OMDE in patch clamp experiments. We verify biochemically that small CoA metabolites decrease long-chain acyl-CoAs. We verify also that palmitoylations of many PM-associated proteins decrease and increase when OMDE is inhibited and stimulated, respectively, by different metabolites. STED microscopy reveals that vesicles formed during constitutive OMDE in T-REX293 cells have 90 to 130 nm diameters. In summary, OMDE is likely a major G-protein-dependent endocytic mechanism that can be constitutively active in some cell types, albeit not BMMs. OMDE depends on different DHHC acyltransferases in different circumstances and can be limited by local supplies of fatty acids, CoA, and long-chain acyl-CoAs.
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Affiliation(s)
- Christine Deisl
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Orson W Moe
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Donald W Hilgemann
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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5
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Zhang X, Kapoor D, Jeong SJ, Fappi A, Stitham J, Shabrish V, Sergin I, Yousif E, Rodriguez-Velez A, Yeh YS, Park A, Yurdagul A, Rom O, Epelman S, Schilling JD, Sardiello M, Diwan A, Cho J, Stitziel NO, Javaheri A, Lodhi IJ, Mittendorfer B, Razani B. Identification of a leucine-mediated threshold effect governing macrophage mTOR signalling and cardiovascular risk. Nat Metab 2024; 6:359-377. [PMID: 38409323 DOI: 10.1038/s42255-024-00984-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 01/09/2024] [Indexed: 02/28/2024]
Abstract
High protein intake is common in western societies and is often promoted as part of a healthy lifestyle; however, amino-acid-mediated mammalian target of rapamycin (mTOR) signalling in macrophages has been implicated in the pathogenesis of ischaemic cardiovascular disease. In a series of clinical studies on male and female participants ( NCT03946774 and NCT03994367 ) that involved graded amounts of protein ingestion together with detailed plasma amino acid analysis and human monocyte/macrophage experiments, we identify leucine as the key activator of mTOR signalling in macrophages. We describe a threshold effect of high protein intake and circulating leucine on monocytes/macrophages wherein only protein in excess of ∼25 g per meal induces mTOR activation and functional effects. By designing specific diets modified in protein and leucine content representative of the intake in the general population, we confirm this threshold effect in mouse models and find ingestion of protein in excess of ∼22% of dietary energy requirements drives atherosclerosis in male mice. These data demonstrate a mechanistic basis for the adverse impact of excessive dietary protein on cardiovascular risk.
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Affiliation(s)
- Xiangyu Zhang
- Department of Medicine and Vascular Medicine Institute, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA, USA
- Pittsburgh VA Medical Center, Pittsburgh, PA, USA
| | - Divya Kapoor
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
- John Cochran VA Medical Center, St Louis, MO, USA
| | - Se-Jin Jeong
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Alan Fappi
- Division of Nutritional Science and Obesity Medicine, Washington University School of Medicine, St. Louis, MO, USA
- Departments of Medicine and Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA
| | - Jeremiah Stitham
- Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, St Louis, MO, USA
| | - Vasavi Shabrish
- Division of Nutritional Science and Obesity Medicine, Washington University School of Medicine, St. Louis, MO, USA
- Departments of Medicine and Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA
| | - Ismail Sergin
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Eman Yousif
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | | | - Yu-Sheng Yeh
- Department of Medicine and Vascular Medicine Institute, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA, USA
- Pittsburgh VA Medical Center, Pittsburgh, PA, USA
| | - Arick Park
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Arif Yurdagul
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Oren Rom
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Slava Epelman
- Peter Munk Cardiac Center and University Health Network, University of Toronto, Toronto, Canada
| | - Joel D Schilling
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Marco Sardiello
- Department of Pediatrics, Washington University School of Medicine, St Louis, MO, USA
| | - Abhinav Diwan
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
- John Cochran VA Medical Center, St Louis, MO, USA
| | - Jaehyung Cho
- Division of Hematology, Department of Medicine, Washington University School of Medicine, St Louis, MO, USA
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA
| | - Nathan O Stitziel
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Ali Javaheri
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
- John Cochran VA Medical Center, St Louis, MO, USA
| | - Irfan J Lodhi
- Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, St Louis, MO, USA
| | - Bettina Mittendorfer
- Division of Nutritional Science and Obesity Medicine, Washington University School of Medicine, St. Louis, MO, USA.
- Departments of Medicine and Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA.
| | - Babak Razani
- Department of Medicine and Vascular Medicine Institute, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA, USA.
- Pittsburgh VA Medical Center, Pittsburgh, PA, USA.
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6
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Putar D, Čizmar A, Chao X, Šimić M, Šoštar M, Ćutić T, Mijanović L, Smolko A, Tu H, Cosson P, Weber I, Cai H, Filić V. IqgC is a potent regulator of macropinocytosis in the presence of NF1 and its loading to macropinosomes is dependent on RasG. Open Biol 2024; 14:230372. [PMID: 38263885 PMCID: PMC10806400 DOI: 10.1098/rsob.230372] [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: 10/09/2023] [Accepted: 11/26/2023] [Indexed: 01/25/2024] Open
Abstract
RasG is a major regulator of macropinocytosis in Dictyostelium discoideum. Its activity is under the control of an IQGAP-related protein, IqgC, which acts as a RasG-specific GAP (GTPase activating protein). IqgC colocalizes with the active Ras at the macropinosome membrane during its formation and for some time after the cup closure. However, the loss of IqgC induces only a minor enhancement of fluid uptake in axenic cells that already lack another RasGAP, NF1. Here, we show that IqgC plays an important role in the regulation of macropinocytosis in the presence of NF1 by restricting the size of macropinosomes. We further provide evidence that interaction with RasG is indispensable for the recruitment of IqgC to forming macropinocytic cups. We also demonstrate that IqgC interacts with another small GTPase from the Ras superfamily, Rab5A, but is not a GAP for Rab5A. Since mammalian Rab5 plays a key role in early endosome maturation, we hypothesized that IqgC could be involved in macropinosome maturation via its interaction with Rab5A. Although an excessive amount of Rab5A reduces the RasGAP activity of IqgC in vitro and correlates with IqgC dissociation from endosomes in vivo, the physiological significance of the Rab5A-IqgC interaction remains elusive.
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Affiliation(s)
- Darija Putar
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Anja Čizmar
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Xiaoting Chao
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 100101 Beijing, People's Republic of China
- College of Life Sciences, University of Chinese Academy of Sciences, 100049 Beijing, People's Republic of China
| | - Marija Šimić
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Marko Šoštar
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Tamara Ćutić
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Lucija Mijanović
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Ana Smolko
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Hui Tu
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 100101 Beijing, People's Republic of China
- College of Life Sciences, University of Chinese Academy of Sciences, 100049 Beijing, People's Republic of China
| | - Pierre Cosson
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Igor Weber
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Huaqing Cai
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 100101 Beijing, People's Republic of China
- College of Life Sciences, University of Chinese Academy of Sciences, 100049 Beijing, People's Republic of China
| | - Vedrana Filić
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
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7
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Lecoultre M, Chliate S, Espinoza FI, Tankov S, Dutoit V, Walker PR. Radio-chemotherapy of glioblastoma cells promotes phagocytosis by macrophages in vitro. Radiother Oncol 2024; 190:110049. [PMID: 38072365 DOI: 10.1016/j.radonc.2023.110049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 11/03/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023]
Abstract
BACKGROUND AND PURPOSE Immunotherapy is actively explored in glioblastoma (GBM) to improve patient prognosis. Tumor-associated macrophages (TAMs) are abundant in GBM and harnessing their function for anti-tumor immunity is of interest. They are plastic cells that are influenced by the tumor microenvironment, by radio-chemotherapy and by their own phagocytic activity. Indeed, the engulfment of necrotic cells promotes pro-inflammatory (and anti-tumoral) functions while the engulfment of apoptotic cells promotes anti-inflammatory (and pro-tumoral) functions through efferocytosis. MATERIALS AND METHODS To model the effect of radio-chemotherapy on the GBM microenvironment, we exposed human macrophages to supernatant of treated GBM cells in vitro. Macrophages were derived from human monocytes and GBM cells from patient-resected tumors. GBM cells were exposed to therapeutically relevant doses of irradiation and chemotherapy. Apoptosis and phagocytic activity were assessed by flow cytometry. RESULTS The phagocytic activity of macrophages was increased, and it was correlated with the proportion of apoptotic GBM cells producing the supernatant. Whether uptake of apoptotic tumor cells could occur would depend upon the expression of efferocytosis-associated receptors. Indeed, we showed that efferocytosis-associated receptors, such as AXL, were upregulated. CONCLUSIONS AND PERSPECTIVES We showed that macrophage phagocytic activity increased when exposed to supernatant from GBM cells treated by radio-chemotherapy. However, as efferocytosis-associated receptors were up-regulated, this effect could be deleterious for the anti-GBM immune response. We speculate that by inducing GBM cell apoptosis in parallel to an increase in efferocytosis receptor expression, the impact of radio-chemotherapy on phagocytic activity could promote anti-inflammatory and pro-tumoral TAM functions.
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Affiliation(s)
- Marc Lecoultre
- Faculty of Medicine, University of Geneva, Geneva, Switzerland; Immunobiology of Brain Tumours Laboratory, Center for Translational Research in Onco-Hematology, University of Geneva, Geneva Switzerland; Division of General Internal Medicine, Geneva University Hospital, Geneva, Switzerland
| | - Sylvie Chliate
- Faculty of Medicine, University of Geneva, Geneva, Switzerland; Immunobiology of Brain Tumours Laboratory, Center for Translational Research in Onco-Hematology, University of Geneva, Geneva Switzerland
| | - Felipe I Espinoza
- Faculty of Medicine, University of Geneva, Geneva, Switzerland; Immunobiology of Brain Tumours Laboratory, Center for Translational Research in Onco-Hematology, University of Geneva, Geneva Switzerland
| | - Stoyan Tankov
- Faculty of Medicine, University of Geneva, Geneva, Switzerland; Immunobiology of Brain Tumours Laboratory, Center for Translational Research in Onco-Hematology, University of Geneva, Geneva Switzerland
| | - Valérie Dutoit
- Faculty of Medicine, University of Geneva, Geneva, Switzerland; Immunobiology of Brain Tumours Laboratory, Center for Translational Research in Onco-Hematology, University of Geneva, Geneva Switzerland; Faculty of Medicine, Laboratory of Tumor Immunology and Center of Oncology, Geneva University Hospital, Geneva, Switzerland
| | - Paul R Walker
- Faculty of Medicine, University of Geneva, Geneva, Switzerland; Immunobiology of Brain Tumours Laboratory, Center for Translational Research in Onco-Hematology, University of Geneva, Geneva Switzerland.
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8
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Parsamanesh N, Poudineh M, Siami H, Butler AE, Almahmeed W, Sahebkar A. RNA interference-based therapies for atherosclerosis: Recent advances and future prospects. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2023; 204:1-43. [PMID: 38458734 DOI: 10.1016/bs.pmbts.2023.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/10/2024]
Abstract
Atherosclerosis represents a pathological state that affects the arterial system of the organism. This chronic, progressive condition is typified by the accumulation of atheroma within arterial walls. Modulation of RNA molecules through RNA-based therapies has expanded the range of therapeutic options available for neurodegenerative diseases, infectious diseases, cancer, and, more recently, cardiovascular disease (CVD). Presently, microRNAs and small interfering RNAs (siRNAs) are the most widely employed therapeutic strategies for targeting RNA molecules, and for regulating gene expression and protein production. Nevertheless, for these agents to be developed into effective medications, various obstacles must be overcome, including inadequate binding affinity, instability, challenges of delivering to the tissues, immunogenicity, and off-target toxicity. In this comprehensive review, we discuss in detail the current state of RNA interference (RNAi)-based therapies.
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Affiliation(s)
- Negin Parsamanesh
- Department of Genetics and Molecular Medicine, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Mohadeseh Poudineh
- Student Research Committee, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Haleh Siami
- School of Medicine, Islamic Azad University of Medical Science, Tehran, Iran
| | - Alexandra E Butler
- Research Department, Royal College of Surgeons in Ireland, Bahrain, Adliya, Bahrain
| | - Wael Almahmeed
- Heart and Vascular Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Amirhossein Sahebkar
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
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9
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Siddiqui H, Deo N, Rutledge MT, Williams MJ, Redpath GM, McCormick SP. Plasminogen Receptors Promote Lipoprotein(a) Uptake by Enhancing Surface Binding and Facilitating Macropinocytosis. Arterioscler Thromb Vasc Biol 2023; 43:1851-1866. [PMID: 37589135 PMCID: PMC10521804 DOI: 10.1161/atvbaha.123.319344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 08/02/2023] [Indexed: 08/18/2023]
Abstract
BACKGROUND High levels of Lp(a) (lipoprotein(a)) are associated with multiple forms of cardiovascular disease. Lp(a) consists of an apoB100-containing particle attached to the plasminogen homologue apo(a). The pathways for Lp(a) clearance are not well understood. We previously discovered that the plasminogen receptor PlgRKT (plasminogen receptor with a C-terminal lysine) promoted Lp(a) uptake in liver cells. Here, we aimed to further define the role of PlgRKT and to investigate the role of 2 other plasminogen receptors, annexin A2 and S100A10 (S100 calcium-binding protein A10) in the endocytosis of Lp(a). METHODS Human hepatocellular carcinoma (HepG2) cells and haploid human fibroblast-like (HAP1) cells were used for overexpression and knockout of plasminogen receptors. The uptake of Lp(a), LDL (low-density lipoprotein), apo(a), and endocytic cargos was visualized and quantified by confocal microscopy and Western blotting. RESULTS The uptake of both Lp(a) and apo(a), but not LDL, was significantly increased in HepG2 and HAP1 cells overexpressing PlgRKT, annexin A2, or S100A10. Conversely, Lp(a) and apo(a), but not LDL, uptake was significantly reduced in HAP1 cells in which PlgRKT and S100A10 were knocked out. Surface binding studies in HepG2 cells showed that overexpression of PlgRKT, but not annexin A2 or S100A10, increased Lp(a) and apo(a) plasma membrane binding. Annexin A2 and S100A10, on the other hand, appeared to regulate macropinocytosis with both proteins significantly increasing the uptake of the macropinocytosis marker dextran when overexpressed in HepG2 and HAP1 cells and knockout of S100A10 significantly reducing dextran uptake. Bringing these observations together, we tested the effect of a PI3K (phosphoinositide-3-kinase) inhibitor, known to inhibit macropinocytosis, on Lp(a) uptake. Results showed a concentration-dependent reduction confirming that Lp(a) uptake was indeed mediated by macropinocytosis. CONCLUSIONS These findings uncover a novel pathway for Lp(a) endocytosis involving multiple plasminogen receptors that enhance surface binding and stimulate macropinocytosis of Lp(a). Although the findings were produced in cell culture models that have limitations, they could have clinical relevance since drugs that inhibit macropinocytosis are in clinical use, that is, the PI3K inhibitors for cancer therapy and some antidepressant compounds.
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Affiliation(s)
- Halima Siddiqui
- Department of Biochemistry (H.S., N.D., M.T.R., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
- School of Biomedical Sciences, HeartOtago (H.S., N.D., M.T.R., M.J.A.W., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
| | - Nikita Deo
- Department of Biochemistry (H.S., N.D., M.T.R., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
- School of Biomedical Sciences, HeartOtago (H.S., N.D., M.T.R., M.J.A.W., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
| | - Malcolm T. Rutledge
- Department of Biochemistry (H.S., N.D., M.T.R., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
- School of Biomedical Sciences, HeartOtago (H.S., N.D., M.T.R., M.J.A.W., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
| | - Michael J.A. Williams
- School of Biomedical Sciences, HeartOtago (H.S., N.D., M.T.R., M.J.A.W., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
- Department of Medicine (M.J.A.W.), Dunedin School of Medicine, University of Otago, New Zealand
| | - Gregory M.I. Redpath
- Department of Biochemistry (H.S., N.D., M.T.R., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
- School of Biomedical Sciences, HeartOtago (H.S., N.D., M.T.R., M.J.A.W., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
| | - Sally P.A. McCormick
- Department of Biochemistry (H.S., N.D., M.T.R., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
- School of Biomedical Sciences, HeartOtago (H.S., N.D., M.T.R., M.J.A.W., G.M.I.R., S.P.A.M.), Dunedin School of Medicine, University of Otago, New Zealand
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Mas-Rosario JA, Medor JD, Jeffway MI, Martínez-Montes JM, Farkas ME. Murine macrophage-based iNos reporter reveals polarization and reprogramming in the context of breast cancer. Front Oncol 2023; 13:1151384. [PMID: 37091169 PMCID: PMC10113556 DOI: 10.3389/fonc.2023.1151384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 03/23/2023] [Indexed: 04/25/2023] Open
Abstract
As part of the first line of defense against pathogens, macrophages possess the ability to differentiate into divergent phenotypes with varying functions. The process by which these cells change their characteristics, commonly referred to as macrophage polarization, allows them to change into broadly pro-inflammatory (M1) or anti-inflammatory (M2) subtypes, and depends on the polarizing stimuli. Deregulation of macrophage phenotypes can result in different pathologies or affect the nature of some diseases, such as cancer and atherosclerosis. Therefore, a better understanding of macrophage phenotype conversion in relevant models is needed to elucidate its potential roles in disease. However, there are few existing probes to track macrophage changes in multicellular environments. In this study, we generated an eGFP reporter cell line based on inducible nitric oxide synthase (iNos) promoter activity in RAW264.7 cells (RAW:iNos-eGFP). iNos is associated with macrophage activation to pro-inflammatory states and decreases in immune-suppressing ones. We validated the fidelity of the reporter for iNos following cytokine-mediated polarization and confirmed that reporter and parental cells behaved similarly. RAW:iNos-eGFP cells were then used to track macrophage responses in different in vitro breast cancer models, and their re-education from anti- to pro-inflammatory phenotypes via a previously reported pyrimido(5,4-b)indole small molecule, PBI1. Using two mouse mammary carcinoma cell lines, 4T1 and EMT6, effects on macrophages were assessed via conditioned media, two-dimensional/monolayer co-culture, and three-dimensional spheroid models. While conditioned media derived from 4T1 or EMT6 cells and monolayer co-cultures of each cancer cell line with RAW:iNos-eGFP cells all resulted in decreased fluorescence, the trends and extents of effects differed. We also observed decreases in iNos-eGFP signal in the macrophages in co-culture assays with 4T1- or EMT6-based spheroids. We then showed that iNos production is enhanced in these cancer models using PBI1, tracking increased fluorescence. Collectively, this work demonstrates that this reporter-based approach provides a facile means to study macrophage responses in complex, multicomponent environments. Beyond the initial studies presented here, this platform can be used with a variety of in vitro models and extended to in vivo applications with intravital imaging.
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Affiliation(s)
- Javier A. Mas-Rosario
- Molecular and Cellular Biology Graduate Program, University of Massachusetts Amherst, Ahmerst, MA, United States
| | - Josue D. Medor
- Department of Biochemistry & Molecular Biology, University of Massachusetts Amherst, Ahmerst, MA, United States
| | - Mary I. Jeffway
- Department of Biochemistry & Molecular Biology, University of Massachusetts Amherst, Ahmerst, MA, United States
| | - José M. Martínez-Montes
- Molecular and Cellular Biology Graduate Program, University of Massachusetts Amherst, Ahmerst, MA, United States
| | - Michelle E. Farkas
- Molecular and Cellular Biology Graduate Program, University of Massachusetts Amherst, Ahmerst, MA, United States
- Department of Chemistry, University of Massachusetts Amherst, Ahmerst, MA, United States
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11
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Li Y, Huang Y, Zhu K, Duan X, Li S, Xu M, Yang C, Liu J, Bäumler H, Yu P, Xie H, Li B, Cao Y, Chen L. Functionalized protein microparticles targeting hACE2 as a novel preventive strategy for SARS-CoV-2 infection. Int J Pharm 2023; 638:122921. [PMID: 37028575 PMCID: PMC10082558 DOI: 10.1016/j.ijpharm.2023.122921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/03/2023] [Accepted: 03/31/2023] [Indexed: 04/08/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic is caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2), resulting in a serious burden on public health and social economy worldwide. SARS-CoV-2 infection is mainly initialized in the nasopharyngeal cavity through the binding of viral spike (S) protein to human angiotensin-converting enzyme 2 (hACE2) receptors which are widely expressed in many human cells. Thus, blockade of the interaction between viral S protein and hACE2 receptor in the primary entry site is a promising prevention strategy for the management of COVID-19. Here we showed protein microparticles (PMPs) decorated with hACE2 could bind and neutralize SARS-CoV-2 S protein-expressing pseudovirus (PSV) and protect host cells from infection in vitro. In the hACE2 transgenic mouse model, administration of intranasal spray with hACE2-decorated PMPs markedly decreased the viral load of SARS-CoV-2 in the lungs though the inflammation was not attenuated significantly. Our results provided evidence for developing functionalized PMPs as a potential strategy for preventing emerging air-borne infectious pathogens, such as SARS-CoV-2 infection.
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12
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Salloum G, Bresnick AR, Backer JM. Macropinocytosis: mechanisms and regulation. Biochem J 2023; 480:335-362. [PMID: 36920093 DOI: 10.1042/bcj20210584] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/22/2023] [Accepted: 02/27/2023] [Indexed: 03/16/2023]
Abstract
Macropinocytosis is defined as an actin-dependent but coat- and dynamin-independent endocytic uptake process, which generates large intracellular vesicles (macropinosomes) containing a non-selective sampling of extracellular fluid. Macropinocytosis provides an important mechanism of immune surveillance by dendritic cells and macrophages, but also serves as an essential nutrient uptake pathway for unicellular organisms and tumor cells. This review examines the cell biological mechanisms that drive macropinocytosis, as well as the complex signaling pathways - GTPases, lipid and protein kinases and phosphatases, and actin regulatory proteins - that regulate macropinosome formation, internalization, and disposition.
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Affiliation(s)
- Gilbert Salloum
- Department of Molecular Pharamacology, Albert Einstein College of Medicine, Bronx, NY, U.S.A
| | - Anne R Bresnick
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY, U.S.A
| | - Jonathan M Backer
- Department of Molecular Pharamacology, Albert Einstein College of Medicine, Bronx, NY, U.S.A
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY, U.S.A
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13
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Molecular Mechanisms of Neutrophil Extracellular Trap (NETs) Degradation. Int J Mol Sci 2023; 24:ijms24054896. [PMID: 36902325 PMCID: PMC10002918 DOI: 10.3390/ijms24054896] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/24/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023] Open
Abstract
Although many studies have been exploring the mechanisms driving NETs formation, much less attention has been paid to the degradation and elimination of these structures. The NETs clearance and the effective removal of extracellular DNA, enzymatic proteins (neutrophil elastase, proteinase 3, myeloperoxidase) or histones are necessary to maintain tissue homeostasis, to prevent inflammation and to avoid the presentation of self-antigens. The persistence and overabundance of DNA fibers in the circulation and tissues may have dramatic consequences for a host leading to the development of various systemic and local damage. NETs are cleaved by a concerted action of extracellular and secreted deoxyribonucleases (DNases) followed by intracellular degradation by macrophages. NETs accumulation depends on the ability of DNase I and DNAse II to hydrolyze DNA. Furthermore, the macrophages actively engulf NETs and this event is facilitated by the preprocessing of NETs by DNase I. The purpose of this review is to present and discuss the current knowledge about the mechanisms of NETs degradation and its role in the pathogenesis of thrombosis, autoimmune diseases, cancer and severe infections, as well as to discuss the possibilities for potential therapeutic interventions. Several anti-NETs approaches had therapeutic effects in animal models of cancer and autoimmune diseases; nevertheless, the development of new drugs for patients needs further study for an effective development of clinical compounds that are able to target NETs.
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Nachvak SM, Shabanpur M, Mostafai R, Heidari Moghaddam R, Moludi J. L-Carnitine supplementation reduces biomarkers of inflammatory and oxidative stress in patients with coronary artery disease: a randomised controlled trial. Arch Physiol Biochem 2023; 129:61-68. [PMID: 32816578 DOI: 10.1080/13813455.2020.1797102] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE l-Carnitine has been suggested as a potential nutrient that alleviates the oxidative and inflammatory damages of coronary artery disease (CAD), but the results of the previous studies of the importance of this supplementation remains unclear. This study attempts to evaluate the effects of l-carnitine (LC) supplementation on oxidative stress and inflammatory biomarkers in patients with CAD. METHODS A double-blind, randomised, placebo-trial was conducted on 75 CAD subjects. Patients were randomly assigned to receive LC (1000 mg/day) or placebo capsules over 3 months. Sera high-sensitivity C-reactive protein (hs-CRP), myeloperoxidase (MPO), nitrotyrosine (NT) and total antioxidant capacity (TAC) were assayed. RESULTS A significant increase in serum TAC and a significant decrease in MPO, NT, and hs-CRP levels were detected following 12 weeks of LC supplementation, compared to the placebo. CONCLUSIONS These results suggest that LC supplementation may exert beneficial effect on cardiovascular health through attenuate oxidative and inflammatory markers in CAD patients.
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Affiliation(s)
- Seyed Mostafa Nachvak
- Nutritional Sciences Department, School of Nutritional Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Maryam Shabanpur
- Student Research Committee, School of Nutritional Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Roghayeh Mostafai
- Nutritional Sciences Department, School of Nutritional Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Reza Heidari Moghaddam
- Department of Cardiology, Faculty of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Jalal Moludi
- Nutritional Sciences Department, School of Nutritional Sciences and Food Technology, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Clinical Research Development Center, Imam Reza Hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran
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15
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Chen J, Zhang H, Li L, Zhang X, Zhao D, Wang L, Wang J, Yang P, Sun H, Liu K, Chen W, Li L, Lin F, Li Z, Chen YE, Zhang J, Pang D, Ouyang H, He Y, Fan J, Tang X. Lp-PLA 2 (Lipoprotein-Associated Phospholipase A 2) Deficiency Lowers Cholesterol Levels and Protects Against Atherosclerosis in Rabbits. Arterioscler Thromb Vasc Biol 2023; 43:e11-e28. [PMID: 36412196 DOI: 10.1161/atvbaha.122.317898] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Elevated plasma Lp-PLA2 (lipoprotein-associated phospholipase A2) activity is closely associated with an increased risk of cardiovascular events. However, whether and how Lp-PLA2 is directly involved in the pathogenesis of atherosclerosis is still unclear. To examine the hypothesis that Lp-PLA2 could be a potential preventative target of atherosclerosis, we generated Lp-PLA2 knockout rabbits and investigated the pathophysiological functions of Lp-PLA2. METHODS Lp-PLA2 knockout rabbits were generated using CRISPR/Cas9 system to assess the role of Lp-PLA2 in plasma lipids regulation and identify its underlying molecular mechanisms. Homozygous knockout rabbits along with wild-type rabbits were fed a cholesterol-rich diet for up to 14 weeks and their atherosclerotic lesions were compared. Moreover, the effects of Lp-PLA2 deficiency on the key cellular behaviors in atherosclerosis were assessed in vitro. RESULTS When rabbits were fed a standard diet, Lp-PLA2 deficiency led to a significant reduction in plasma lipids. The decreased protein levels of SREBP2 (sterol regulatory element-binding protein 2) and HMGCR (3-hydroxy-3-methylglutaryl coenzyme A reductase) in livers of homozygous knockout rabbits indicated that the cholesterol biosynthetic pathway was impaired with Lp-PLA2 deficiency. In vitro experiments further demonstrated that intracellular Lp-PLA2 efficiently enhanced SREBP2-related cholesterol biosynthesis signaling independently of INSIGs (insulin-induced genes). When fed a cholesterol-rich diet, homozygous knockout rabbits exhibited consistently lower level of hypercholesterolemia, and their aortic atherosclerosis lesions were significantly reduced by 60.2% compared with those of wild-type rabbits. The lesions of homozygous knockout rabbits were characterized by reduced macrophages and the expression of inflammatory cytokines. Macrophages of homozygous knockout rabbits were insensitive to M1 polarization and showed reduced DiI-labeled lipoprotein uptake capacity compared with wild-type macrophages. Lp-PLA2 deficiency also inhibited the adhesion between monocytes and endothelial cells. CONCLUSIONS These results demonstrate that Lp-PLA2 plays a causal role in regulating blood lipid homeostasis and Lp-PLA2 deficiency protects against dietary cholesterol-induced atherosclerosis in rabbits. Lp-PLA2 could be a potential target for the prevention of atherosclerosis.
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Affiliation(s)
- Jiahuan Chen
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Huanyu Zhang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Linquan Li
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Xinwei Zhang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Dazhong Zhao
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Lingyu Wang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Jiaqi Wang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Ping Yang
- Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China (P.Y., H.S., K.L., W.C., Y.H.)
| | - Huan Sun
- Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China (P.Y., H.S., K.L., W.C., Y.H.)
| | - Kun Liu
- Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China (P.Y., H.S., K.L., W.C., Y.H.)
| | - Weiwei Chen
- Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China (P.Y., H.S., K.L., W.C., Y.H.)
| | - Lin Li
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Feng Lin
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Zhanjun Li
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.)
| | - Y Eugene Chen
- Department of Internal Medicine, Center for Advanced Models for Translational Sciences and Therapeutics, University of Michigan Medical Center, Ann Arbor (Y.E.C., J.Z.)
| | - Jifeng Zhang
- Department of Internal Medicine, Center for Advanced Models for Translational Sciences and Therapeutics, University of Michigan Medical Center, Ann Arbor (Y.E.C., J.Z.)
| | - Daxin Pang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.).,Chongqing Research Institute, Jilin University, Chongqing, China (D.P., H.O., X.T.)
| | - Hongsheng Ouyang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.).,Chongqing Research Institute, Jilin University, Chongqing, China (D.P., H.O., X.T.)
| | - Yuquan He
- Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China (P.Y., H.S., K.L., W.C., Y.H.)
| | - Jianglin Fan
- Department of Molecular Pathology, Faculty of Medicine, Graduate School of Medical Sciences, University of Yamanashi, Japan (J.F.)
| | - Xiaochun Tang
- College of Animal Sciences, Jilin University, Changchun, Jilin Province, China (J.C., H.Z., Linquan Li, X.Z., D.Z., L.W., J.W., Lin Li, F.L., Z.L., D.P., H.O., X.T.).,Chongqing Research Institute, Jilin University, Chongqing, China (D.P., H.O., X.T.)
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Netherton CL, Shimmon GL, Hui JYK, Connell S, Reis AL. African Swine Fever Virus Host-Pathogen Interactions. Subcell Biochem 2023; 106:283-331. [PMID: 38159232 DOI: 10.1007/978-3-031-40086-5_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
African swine fever virus is a complex double-stranded DNA virus that exhibits tropism for cells of the mononuclear phagocytic system. Virus replication is a multi-step process that involves the nucleus of the host cell as well the formation of large perinuclear sites where progeny virions are assembled prior to transport to, and budding through, the plasma membrane. Like many viruses, African swine fever virus reorganises the cellular architecture to facilitate its replication and has evolved multiple mechanisms to avoid the potential deleterious effects of host cell stress response pathways. However, how viral proteins and virus-induced structures trigger cellular stress pathways and manipulate the subsequent responses is still relatively poorly understood. African swine fever virus alters nuclear substructures, modulates autophagy, apoptosis and the endoplasmic reticulum stress response pathways. The viral genome encodes for at least 150 genes, of which approximately 70 are incorporated into the virion. Many of the non-structural genes have not been fully characterised and likely play a role in host range and modifying immune responses. As the field moves towards approaches that take a broader view of the effect of expression of individual African swine fever genes, we summarise how the different steps in virus replication interact with the host cell and the current state of knowledge on how it modulates the resulting stress responses.
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Sha X, Dai Y, Chong L, Wei M, Xing M, Zhang C, Li J. Pro-efferocytic macrophage membrane biomimetic nanoparticles for the synergistic treatment of atherosclerosis via competition effect. J Nanobiotechnology 2022; 20:506. [PMID: 36456996 PMCID: PMC9714205 DOI: 10.1186/s12951-022-01720-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 11/22/2022] [Indexed: 12/05/2022] Open
Abstract
Macrophages participate in many links in the pathological process of atherosclerosis (AS) and the regulation of influence of macrophages at the molecular level might be a new avenue for AS treatment. For this aim, the macrophage membrane biomimetic nanoparticles, derived from macrophage membrane coated SHP1i-loaded liposome NPs (MM@Lips-SHP1i) was designed. Due to the reservation of intrinsic membrane proteins and function from macrophages, the biomimic nanoparticles could effectively evade clearance by the immune system, prolong blood circulation time and actively tend and aggregate to atherosclerotic plaques. More importantly, in the plaque area, MM@Lips-SHP1i nanoparticles could compete with macrophages in vivo to bind with oxidized low-density lipoprotein (oxLDL) and lipopolysaccharide (LPS), reduce uptake of new lipids by macrophages, reduce foam cell formation, and inhibit the expression of pro-inflammatory cytokines. In addition, small molecule inhibitor of SHP-1, the downstream effector molecule of CD47 loaded in macrophage membrane biomimetic nanoparticles could interrupt CD47-SIRPα signal transduction in monocytes and macrophages, thereby enhancing the efferocytosis of macrophages, inhibiting the progression of plaque, achieving synergistic treatment of atherosclerosis. This work focuses on the key process in the formation of AS, macrophage foaming and chronic inflammation, and is based on the fact that macrophage membrane biomimetic nanoparticles can preserve the key surface proteins of macrophages closely related to the formation of AS, providing a new avenue to inhibit the progression of AS by utilizing the biological characteristics of macrophage membrane in macrophage membrane biomimetic nanoparticles.
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Affiliation(s)
- Xuan Sha
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China
| | - Yue Dai
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China ,grid.413389.40000 0004 1758 1622Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221006 China
| | - Lijuan Chong
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China ,grid.413389.40000 0004 1758 1622Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221006 China
| | - Min Wei
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China ,grid.413389.40000 0004 1758 1622Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221006 China
| | - Mengyuan Xing
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China
| | - Chun Zhang
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China ,grid.413389.40000 0004 1758 1622Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221006 China
| | - Jingjing Li
- grid.417303.20000 0000 9927 0537School of Medical Imaging, Xuzhou Medical University, Xuzhou, 221004 China ,grid.413389.40000 0004 1758 1622Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221006 China
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18
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Durgan J, Florey O. Many roads lead to CASM: Diverse stimuli of noncanonical autophagy share a unifying molecular mechanism. SCIENCE ADVANCES 2022; 8:eabo1274. [PMID: 36288315 PMCID: PMC9604613 DOI: 10.1126/sciadv.abo1274] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Autophagy is a fundamental catabolic process coordinated by a network of autophagy-related (ATG) proteins. These ATG proteins also perform an important parallel role in "noncanonical" autophagy, a lysosome-associated signaling pathway with key functions in immunity, inflammation, cancer, and neurodegeneration. While the noncanonical autophagy pathway shares the common ATG machinery, it bears key mechanistic and functional distinctions, and is characterized by conjugation of ATG8 to single membranes (CASM). Here, we review the diverse, and still expanding, collection of stimuli and processes now known to harness the noncanonical autophagy pathway, including engulfment processes, drug treatments, TRPML1 and STING signaling, viral infection, and other pathogenic factors. We discuss the multiple associated routes to CASM and assess their shared and distinctive molecular features. By integrating these findings, we propose an updated and unifying mechanism for noncanonical autophagy, centered on ATG16L1 and V-ATPase.
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19
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Chen H, Xu S, Hu Z, Wei Y, Zhu Y, Fang S, Pan Q, Liu K, Li N, Zhu L, Xu G. Bioinformatics algorithm for lung adenocarcinoma based on macropinocytosis-related long noncoding RNAs as a reliable indicator for predicting survival outcomes and selecting suitable anti-tumor drugs. Medicine (Baltimore) 2022; 101:e30543. [PMID: 36197217 PMCID: PMC9509037 DOI: 10.1097/md.0000000000030543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
As a highly conserved endocytic mechanism during evolution, macropinocytosis is enhanced in several malignant tumors, which promotes tumor growth by ingesting extracellular nutrients. Recent research has emphasized the crucial role of macropinocytosis in tumor immunity. In the present study, we established a new macropinocytosis-related algorithm comprising molecular subtypes and a prognostic signature, in which patients with lung adenocarcinoma (LUAD) were classified into different clusters and risk groups based on the expression of 16 macropinocytosis-related long noncoding RNAs. According to the molecular subtypes, we discovered that patients with LUAD in cluster1 had a higher content of stromal cells and immune cells, stronger intensity of immune activities, higher expression of PD1, PDL1, and HAVCR2, and a higher tumor mutational burden, while patients in cluster2 exhibited better survival advantages. Furthermore, the constructed prognostic signature revealed that low-risk patients showed better survival outcomes, earlier tumor stage, higher abundance of stromal cells and immune cells, higher immune activities, higher expression of PD1, PDL1, CTLA4, and HAVCR2, and more sensitivity to Paclitaxel and Erlotinib. By contrast, patients with high scores were more suitable for Gefitinib treatment. In conclusion, the novel algorithm that divided patients with LUAD into different groups according to their clusters and risk groups, which could provide theoretical support for predicting their survival outcomes and selecting drugs for chemotherapy, targeted therapy, and immunotherapy.
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Affiliation(s)
- Hang Chen
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Shuguang Xu
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Zeyang Hu
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Yiqing Wei
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Youjie Zhu
- Department of Respiratory Medicine, Ningbo Huamei Hospital, Chinese Academy of Sciences, Ningbo, Zhejiang, China
| | - Shenzhe Fang
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Qiaoling Pan
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Kaitai Liu
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Ni Li
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Linwen Zhu
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
| | - Guodong Xu
- Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China
- *Correspondence: Guodong Xu, Department of Cardiothoracic Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo, Zhejiang, China (e-mail: )
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20
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Odfalk KF, Bieniek KF, Hopp SC. Microglia: Friend and foe in tauopathy. Prog Neurobiol 2022; 216:102306. [PMID: 35714860 PMCID: PMC9378545 DOI: 10.1016/j.pneurobio.2022.102306] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 04/24/2022] [Accepted: 06/10/2022] [Indexed: 12/16/2022]
Abstract
Aggregation of misfolded microtubule associated protein tau into abnormal intracellular inclusions defines a class of neurodegenerative diseases known as tauopathies. The consistent spatiotemporal progression of tau pathology in Alzheimer's disease (AD) led to the hypothesis that tau aggregates spread in the brain via bioactive tau "seeds" underlying advancing disease course. Recent studies implicate microglia, the resident immune cells of the central nervous system, in both negative and positive regulation of tau pathology. Polymorphisms in genes that alter microglial function are associated with the development of AD and other tauopathies. Experimental manipulation of microglia function can alter tau pathology and microglia-mediated neuroinflammatory cascades can exacerbate tau pathology. Microglia also exert protective functions by mitigating tau spread: microglia internalize tau seeds and have the capacity to degrade them. However, when microglia fail to degrade these tau seeds there are deleterious consequences, including secretion of exosomes containing tau that can spread to neurons. This review explores the intersection of microglia and tau from the perspective of neuropathology, neuroimaging, genetics, transcriptomics, and molecular biology. As tau-targeted therapies such as anti-tau antibodies advance through clinical trials, it is critical to understand the interaction between tau and microglia.
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Affiliation(s)
- Kristian F Odfalk
- Glenn Biggs Institute for Alzheimer's and Neurodegenerative Diseases, University of Texas Health Science Center San Antonio, San Antonio, TX, USA; Department of Pharmacology, University of Texas Health Science Center San Antonio, San Antonio, TX, USA
| | - Kevin F Bieniek
- Glenn Biggs Institute for Alzheimer's and Neurodegenerative Diseases, University of Texas Health Science Center San Antonio, San Antonio, TX, USA; Department of Pathology and Laboratory Medicine, University of Texas Health Science Center San Antonio, San Antonio, TX, USA
| | - Sarah C Hopp
- Glenn Biggs Institute for Alzheimer's and Neurodegenerative Diseases, University of Texas Health Science Center San Antonio, San Antonio, TX, USA; Department of Pharmacology, University of Texas Health Science Center San Antonio, San Antonio, TX, USA.
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21
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Liu M, Cai Y, Pan J, Peter K, Li Z. Macrophage polarization as a potential therapeutic target for atherosclerosis: a dynamic stochastic modelling study. ROYAL SOCIETY OPEN SCIENCE 2022; 9:220239. [PMID: 35950200 PMCID: PMC9346359 DOI: 10.1098/rsos.220239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 07/08/2022] [Indexed: 06/15/2023]
Abstract
We proposed a dynamic stochastic mathematical model to evaluate the role of macrophage polarization in plaque development. The dynamic process of macrophages from proliferation to death was simulated under different lipid microenvironments. The probability of macrophage phenotypic switching was described using a Bernoulli distribution where the stochastic variable was determined by the local lipid level. Moreover, the interactions between macrophages and microenvironmental factors vary with macrophage phenotype. We investigated the distribution of key microenvironmental factors, the dynamics of macrophage polarization and its influence on foam cell formation. M1 macrophages were found to predominate in advanced plaque corresponding to the exacerbated inflammation observed in mice experiments. The imbalance between the deposition of oxidized low-density lipoprotein and phagocytic effects of macrophages governed the formation of foam cells. Furthermore, we simulated targeted therapies by either directly inhibiting the polarization probability to M1 macrophages or indirectly regulating macrophage polarization due to high-density lipoprotein levels. Comparison of simulation results with experimental findings in both therapies indicated that the intervention and regulation of macrophage polarization could influence plaque microenvironment and subsequently induce plaque regression, especially in the early stage. The proposed modelling system can facilitate the evaluation of novel therapies targeting macrophage polarization.
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Affiliation(s)
- Mengchen Liu
- School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Yan Cai
- School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Jichao Pan
- School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, People's Republic of China
| | - Karlheinz Peter
- Atherothrombosis and Vascular Biology, Baker Heart and Diabetes Institute, PO Box 6492, St Kilda Road Central, Melbourne, VIC 8008, Australia
| | - Zhiyong Li
- School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, People's Republic of China
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology (QUT), Brisbane, QLD 4001, Australia
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22
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Mohd Danish Khan, Mohammad Kaleem Ahmad, Roshan Alam, Fahad Khan, Mohammad Mustufa Khan. Circulatory T-cadherin is a potential biomarker for atherosclerosis. Biomedicine (Taipei) 2022. [DOI: 10.51248/.v42i3.1591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
T-cadherin, a special member of cadherin family, expresses with blood circulation involving the heart i.e. CVS. Cadherin is connected with the healthy conditions of an individual and normal functioning of cardio-vascular metabolism. T-cadherin is mainly associated with blood vascular system of human. Previous studies analysed this cadherin been unexpressed within the fat storing tissues i.e. adipose tissue of peri-aortic and peri-coronary, it is present within endothelium as well as in vascularized smooth muscular cells which includes the area nearby coronary vessels and aorta. The area and site of this cadherin is attention-grabbing because it particularly related to atherosclerosis and cardiovascular disease (CVD). T-cadherin - a protein acting as the receptor for low density lipoproteins (LDL). It may act as a special biomarker for atherosclerosis. Previous studies on T-cadherin showed that it has cardio-protective role. Furthermore, research is essential to enumerate the cardio-protective function of T-cadherin. It can be an important therapeutic target in developing new medicine to decrease incident of heart disease and its complications.
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23
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Xiang P, Blanchard V, Francis GA. Smooth Muscle Cell—Macrophage Interactions Leading to Foam Cell Formation in Atherosclerosis: Location, Location, Location. Front Physiol 2022; 13:921597. [PMID: 35795646 PMCID: PMC9251363 DOI: 10.3389/fphys.2022.921597] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 05/30/2022] [Indexed: 11/13/2022] Open
Abstract
Cholesterol-overloaded cells or “foam cells” in the artery wall are the biochemical hallmark of atherosclerosis, and are responsible for much of the growth, inflammation and susceptibility to rupture of atherosclerotic lesions. While it has previously been thought that macrophages are the main contributor to the foam cell population, recent evidence indicates arterial smooth muscle cells (SMCs) are the source of the majority of foam cells in both human and murine atherosclerosis. This review outlines the timeline, site of appearance and proximity of SMCs and macrophages with lipids in human and mouse atherosclerosis, and likely interactions between SMCs and macrophages that promote foam cell formation and removal by both cell types. An understanding of these SMC-macrophage interactions in foam cell formation and regression is expected to provide new therapeutic targets to reduce the burden of atherosclerosis for the prevention of coronary heart disease, stroke and peripheral vascular disease.
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24
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Hu F, Lu F, Xiao H, Dong M, Xu Y. Relationship Between Hypertension and Basilar Atherosclerosis in Chinese Han Population: A High-Resolution Magnetic Resonance Imaging Study. Front Cardiovasc Med 2022; 9:830664. [PMID: 35571152 PMCID: PMC9094699 DOI: 10.3389/fcvm.2022.830664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 03/29/2022] [Indexed: 11/28/2022] Open
Abstract
Objective To investigate the relationship between hypertension and basilar atherosclerosis evaluated by high-resolution magnetic resonance imaging (HR-MRI) in the Chinese Han population. Methods High resolution-MRI vessel wall imaging was performed in selected 193 patients for various indications. Multivariable logistic regression models based on odds ratio (OR) with their associated 95% confidence interval (CI) were used to assess the relationship between hypertension and basilar artery (BA) plaque, moderate or severe stenosis of BA plaque, and vulnerable plaque. A linear regression model was used to assess the relationship between hypertension and BA plaque numbers. Results Patients with hypertension had a higher proportion of BA plaque and vulnerable plaque as well as more number of enhancements of BA plaque and serious plaque compared with normotensive patients (all values of p < 0.05). Multivariable logistic regression analysis indicated that patients with hypertension had an increased risk for and more number of enhancements of BA plaque (adjusted-OR: 4.32, 95% CI 1.89–9.88, p < 0.001; adjusted-β: 0.55, 95% CI 0.14–0.96, p = 0.009, respectively) and had a higher proportion of moderate or severe stenosis of BA plaque and vulnerable plaque (adjusted-OR: 3.08, 95% CI 0.77–12.32, p = 0.111; adjusted-OR: 4.52, 95% CI 1.50–13.64, p = 0.007, respectively) compared with the normotensive group. Moreover, there was a saturation effect of age on the prevalence of BA plaque and vulnerable plaque. Conclusion Hypertension was the independent risk factor of BA plaque and vulnerable plaque assessed by HR-MRI in the Chinese Han population.
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Affiliation(s)
- Feng Hu
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Feng Lu
- Department of Cardiothoracic Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Huiling Xiao
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Meixue Dong
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yan Xu
- Department of Cardiovascular Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, China
- *Correspondence: Yan Xu,
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25
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Piezo1 activation using Yoda1 inhibits macropinocytosis in A431 human epidermoid carcinoma cells. Sci Rep 2022; 12:6322. [PMID: 35428847 PMCID: PMC9012786 DOI: 10.1038/s41598-022-10153-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 03/09/2022] [Indexed: 11/08/2022] Open
Abstract
Macropinocytosis is a type of endocytosis accompanied by actin rearrangement-driven membrane deformation, such as lamellipodia formation and membrane ruffling, followed by the formation of large vesicles, macropinosomes. Ras-transformed cancer cells efficiently acquire exogenous amino acids for their survival through macropinocytosis. Thus, inhibition of macropinocytosis is a promising strategy for cancer therapy. To date, few specific agents that inhibit macropinocytosis have been developed. Here, focusing on the mechanosensitive ion channel Piezo1, we found that Yoda1, a Piezo1 agonist, potently inhibits macropinocytosis induced by epidermal growth factor (EGF). The inhibition of ruffle formation by Yoda1 was dependent on the extracellular Ca2+ influx through Piezo1 and on the activation of the calcium-activated potassium channel KCa3.1. This suggests that Ca2+ ions can regulate EGF-stimulated macropinocytosis. We propose the potential for macropinocytosis inhibition through the regulation of a mechanosensitive channel activity using chemical tools.
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26
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Abstract
Phagocytes play critical roles in the maintenance of organismal homeostasis and immunity. Central to their role is their ability to take up and process exogenous material via the related processes of phagocytosis and macropinocytosis. The mechanisms and functions underlying macropinocytosis have remained severely understudied relative to phagocytosis. In recent years, however, there has been a renaissance in macropinocytosis research. Phagocytes can engage in various forms of macropinocytosis including an "induced" form and a "constitutive" form. This chapter, however, will focus on constitutive macropinocytosis and its role in the maintenance of immunity. Functions previously attributed to macropinocytosis, including antigen presentation and immune surveillance, will be revisited in light of recent revelations and emerging concepts will be highlighted.
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Affiliation(s)
- Johnathan Canton
- Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, Canada.
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27
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Abstract
Macropinocytosis is an evolutionarily conserved endocytic pathway that mediates non-selective uptake of extracellular fluid in bulk. Macropinocytosis is initiated by localized polymerization of the actin cytoskeleton, which generates plasma membrane protrusions that enclose part of the environment into large endocytic vesicles. From amoebae to mammalian cells, the actin dynamics that drive macropinosome formation are regulated by a conserved set of intracellular signaling proteins including Ras superfamily GTPases and PI3-kinases. In mammalian cells, multiple upstream signaling pathways control activity of these core regulators in response to cell-extrinsic and cell-intrinsic stimuli. Growth factor signaling pathways play a central role in macropinocytosis induction. In addition, an increasing number of functionally diverse processes has been identified as macropinocytosis regulators, including several nutrient-sensing and developmental signaling pathways. Many of these signaling pathways have proto-oncogenic properties, and their dysregulation drives the high macropinocytic activity that is commonly observed in cancer cells. These regulatory principles illustrate how macropinocytosis is controlled by complex upstream inputs to exert diverse cellular functions in physiological and pathological contexts.
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28
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Jaldin-Fincati J, Moussaoui S, Gimenez MC, Ho CY, Lancaster CE, Botelho R, Ausar F, Brookes R, Terebiznik M. Aluminum hydroxide adjuvant diverts the uptake and trafficking of genetically detoxified pertussis toxin to lysosomes in macrophages. Mol Microbiol 2022; 117:1173-1195. [PMID: 35344242 PMCID: PMC9321756 DOI: 10.1111/mmi.14900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 03/17/2022] [Accepted: 03/21/2022] [Indexed: 11/29/2022]
Abstract
Aluminum salts have been successfully utilized as adjuvants to enhance the immunogenicity of vaccine antigens since the 1930s. However, the cellular mechanisms behind the immune adjuvanticity effect of these materials in antigen‐presenting cells are poorly understood. In this study, we investigated the uptake and trafficking of aluminum oxy‐hydroxide (AlOOH), in RAW 264.7 murine and U‐937 human macrophages‐like cells. Furthermore, we determined the impact that the adsorption to AlOOH particulates has on the trafficking of a Bordetella pertussis vaccine candidate, the genetically detoxified pertussis toxin (gdPT). Our results indicate that macrophages internalize AlOOH by constitutive macropinocytosis assisted by the filopodial protrusions that capture the adjuvant particles. Moreover, we show that AlOOH has the capacity to nonspecifically adsorb IgG, engaging opsonic phagocytosis, which is a feature that may allow for more effective capture and uptake of adjuvant particles by antigen‐presenting cells (APCs) at the site of vaccine administration. We found that AlOOH traffics to endolysosomal compartments that hold degradative properties. Importantly, while we show that gdPT escapes degradative endolysosomes and traffics toward the retrograde pathway, as reported for the wild‐type pertussis toxin, the adsorption to AlOOH diverts gdPT to traffic to the adjuvant’s lysosome‐type compartments, which may be key for MHC‐II‐driven antigen presentation and activation of CD4+ T cell. Thus, our findings establish a direct link between antigen adsorption to AlOOH and the intracellular trafficking of antigens within antigen‐presenting cells and bring to light a new potential mechanism for aluminum adjuvancy. Moreover, the in‐vitro single‐cell approach described herein provides a general framework and tools for understanding critical attributes of other vaccine formulations.
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Affiliation(s)
- Javier Jaldin-Fincati
- Department of Biological Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Serene Moussaoui
- Department of Biological Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada.,Department of Cell and Systems Biology, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Maria Cecilia Gimenez
- Department of Biological Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Cheuk Y Ho
- Department of Biological Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Charlene E Lancaster
- Department of Biological Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada.,Department of Cell and Systems Biology, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Roberto Botelho
- Department of Chemistry and Biology, Ryerson University, Toronto, Ontario, Canada
| | - Fernando Ausar
- BioProcess Research and Development, Sanofi Pasteur, 1755 Steeles Ave West, Toronto, Ontario M3R 3T4, Canada
| | - Roger Brookes
- BioProcess Research and Development, Sanofi Pasteur, 1755 Steeles Ave West, Toronto, Ontario M3R 3T4, Canada
| | - Mauricio Terebiznik
- Department of Biological Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada.,Department of Cell and Systems Biology, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
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29
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Bhutia YD, Mathew M, Sivaprakasam S, Ramachandran S, Ganapathy V. Unconventional Functions of Amino Acid Transporters: Role in Macropinocytosis (SLC38A5/SLC38A3) and Diet-Induced Obesity/Metabolic Syndrome (SLC6A19/SLC6A14/SLC6A6). Biomolecules 2022; 12:biom12020235. [PMID: 35204736 PMCID: PMC8961558 DOI: 10.3390/biom12020235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 01/24/2022] [Accepted: 01/27/2022] [Indexed: 02/06/2023] Open
Abstract
Amino acid transporters are expressed in mammalian cells not only in the plasma membrane but also in intracellular membranes. The conventional function of these transporters is to transfer their amino acid substrates across the lipid bilayer; the direction of the transfer is dictated by the combined gradients for the amino acid substrates and the co-transported ions (Na+, H+, K+ or Cl−) across the membrane. In cases of electrogenic transporters, the membrane potential also contributes to the direction of the amino acid transfer. In addition to this expected traditional function, several unconventional functions are known for some of these amino acid transporters. This includes their role in intracellular signaling, regulation of acid–base balance, and entry of viruses into cells. Such functions expand the biological roles of these transporters beyond the logical amino acid homeostasis. In recent years, two additional unconventional biochemical/metabolic processes regulated by certain amino acid transporters have come to be recognized: macropinocytosis and obesity. This adds to the repertoire of biological processes that are controlled and regulated by amino acid transporters in health and disease. In the present review, we highlight the unusual involvement of selective amino acid transporters in macropinocytosis (SLC38A5/SLC38A3) and diet-induced obesity/metabolic syndrome (SLC6A19/SLC6A14/SLC6A6).
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30
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Siddiqui H, Yevstigneyev N, Madani G, McCormick S. Approaches to Visualising Endocytosis of LDL-Related Lipoproteins. Biomolecules 2022; 12:biom12020158. [PMID: 35204658 PMCID: PMC8961563 DOI: 10.3390/biom12020158] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/20/2021] [Accepted: 01/12/2022] [Indexed: 02/04/2023] Open
Abstract
Endocytosis is the process by which molecules are actively transported into cells. It can take on a variety of forms depending on the cellular machinery involved ranging from specific receptor-mediated endocytosis to the less selective and actin-driven macropinocytosis. The plasma lipoproteins, which deliver lipids and other cargo to cells, have been intensely studied with respect to their endocytic uptake. One of the first molecules to be visualised undergoing endocytosis via a receptor-mediated, clathrin-dependent pathway was low-density lipoprotein (LDL). The LDL molecule has subsequently been shown to be internalised through multiple endocytic pathways. Dissecting the pathways of lipoprotein endocytosis has been crucial to understanding the regulation of plasma lipid levels and how lipids enter cells in the arterial wall to promote atherosclerosis. It has also aided understanding of the dysregulation that occurs in plasma lipid levels when molecules involved in uptake are defective, as is the case in familial hypercholesterolemia (FH). The aim of this review is to outline the many endocytic pathways utilised for lipoprotein uptake. It explores the various experimental approaches that have been applied to visualise lipoprotein endocytosis with an emphasis on LDL and its more complex counterpart, lipoprotein(a) [Lp(a)]. Finally, we look at new developments in lipoprotein visualisation that hold promise for scrutinising endocytic pathways to finer detail in the future.
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Affiliation(s)
- Halima Siddiqui
- Department of Biochemistry, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand; (H.S.); (N.Y.); (G.M.)
- HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand
| | - Nikita Yevstigneyev
- Department of Biochemistry, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand; (H.S.); (N.Y.); (G.M.)
- HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand
| | - Golnoush Madani
- Department of Biochemistry, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand; (H.S.); (N.Y.); (G.M.)
- HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand
| | - Sally McCormick
- Department of Biochemistry, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand; (H.S.); (N.Y.); (G.M.)
- HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin 9016, New Zealand
- Correspondence:
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31
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Quinn SE, Huang L, Kerkvliet JG, Swanson JA, Smith S, Hoppe AD, Anderson RB, Thiex NW, Scott BL. The structural dynamics of macropinosome formation and PI3-kinase-mediated sealing revealed by lattice light sheet microscopy. Nat Commun 2021. [PMID: 34376698 DOI: 10.1101/2020.12.01.390195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2023] Open
Abstract
Macropinosomes are formed by shaping actin-rich plasma membrane ruffles into large intracellular organelles in a phosphatidylinositol 3-kinase (PI3K)-coordinated manner. Here, we utilize lattice lightsheet microscopy and image visualization methods to map the three-dimensional structure and dynamics of macropinosome formation relative to PI3K activity. We show that multiple ruffling morphologies produce macropinosomes and that the majority form through collisions of adjacent PI3K-rich ruffles. By combining multiple volumetric representations of the plasma membrane structure and PI3K products, we show that PI3K activity begins early throughout the entire ruffle volume and continues to increase until peak activity concentrates at the base of the ruffle after the macropinosome closes. Additionally, areas of the plasma membrane rich in ruffling had increased PI3K activity and produced many macropinosomes of various sizes. Pharmacologic inhibition of PI3K activity had little effect on the rate and morphology of membrane ruffling, demonstrating that early production of 3'-phosphoinositides within ruffles plays a minor role in regulating their morphology. However, 3'-phosphoinositides are critical for the fusogenic activity that seals ruffles into macropinosomes. Taken together, these data indicate that local PI3K activity is amplified in ruffles and serves as a priming mechanism for closure and sealing of ruffles into macropinosomes.
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Affiliation(s)
- Shayne E Quinn
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA
- BioSNTR, South Dakota Mines, Rapid City, SD, USA
| | - Lu Huang
- Department of Biology and Microbiology, South Dakota State University (SDSU), Brookings, SD, USA
- BioSNTR, SDSU, Brookings, SD, USA
| | - Jason G Kerkvliet
- BioSNTR, SDSU, Brookings, SD, USA
- Department of Chemistry and Biochemistry, SDSU, Brookings, SD, USA
| | - Joel A Swanson
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI, USA
| | - Steve Smith
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA
- BioSNTR, South Dakota Mines, Rapid City, SD, USA
| | - Adam D Hoppe
- BioSNTR, SDSU, Brookings, SD, USA
- Department of Chemistry and Biochemistry, SDSU, Brookings, SD, USA
| | - Robert B Anderson
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA.
- BioSNTR, South Dakota Mines, Rapid City, SD, USA.
| | - Natalie W Thiex
- Department of Biology and Microbiology, South Dakota State University (SDSU), Brookings, SD, USA.
- BioSNTR, SDSU, Brookings, SD, USA.
| | - Brandon L Scott
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA.
- BioSNTR, South Dakota Mines, Rapid City, SD, USA.
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Quinn SE, Huang L, Kerkvliet JG, Swanson JA, Smith S, Hoppe AD, Anderson RB, Thiex NW, Scott BL. The structural dynamics of macropinosome formation and PI3-kinase-mediated sealing revealed by lattice light sheet microscopy. Nat Commun 2021; 12:4838. [PMID: 34376698 PMCID: PMC8355319 DOI: 10.1038/s41467-021-25187-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 07/22/2021] [Indexed: 12/11/2022] Open
Abstract
Macropinosomes are formed by shaping actin-rich plasma membrane ruffles into large intracellular organelles in a phosphatidylinositol 3-kinase (PI3K)-coordinated manner. Here, we utilize lattice lightsheet microscopy and image visualization methods to map the three-dimensional structure and dynamics of macropinosome formation relative to PI3K activity. We show that multiple ruffling morphologies produce macropinosomes and that the majority form through collisions of adjacent PI3K-rich ruffles. By combining multiple volumetric representations of the plasma membrane structure and PI3K products, we show that PI3K activity begins early throughout the entire ruffle volume and continues to increase until peak activity concentrates at the base of the ruffle after the macropinosome closes. Additionally, areas of the plasma membrane rich in ruffling had increased PI3K activity and produced many macropinosomes of various sizes. Pharmacologic inhibition of PI3K activity had little effect on the rate and morphology of membrane ruffling, demonstrating that early production of 3'-phosphoinositides within ruffles plays a minor role in regulating their morphology. However, 3'-phosphoinositides are critical for the fusogenic activity that seals ruffles into macropinosomes. Taken together, these data indicate that local PI3K activity is amplified in ruffles and serves as a priming mechanism for closure and sealing of ruffles into macropinosomes.
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Affiliation(s)
- Shayne E Quinn
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA
- BioSNTR, South Dakota Mines, Rapid City, SD, USA
| | - Lu Huang
- Department of Biology and Microbiology, South Dakota State University (SDSU), Brookings, SD, USA
- BioSNTR, SDSU, Brookings, SD, USA
| | - Jason G Kerkvliet
- BioSNTR, SDSU, Brookings, SD, USA
- Department of Chemistry and Biochemistry, SDSU, Brookings, SD, USA
| | - Joel A Swanson
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI, USA
| | - Steve Smith
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA
- BioSNTR, South Dakota Mines, Rapid City, SD, USA
| | - Adam D Hoppe
- BioSNTR, SDSU, Brookings, SD, USA
- Department of Chemistry and Biochemistry, SDSU, Brookings, SD, USA
| | - Robert B Anderson
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA.
- BioSNTR, South Dakota Mines, Rapid City, SD, USA.
| | - Natalie W Thiex
- Department of Biology and Microbiology, South Dakota State University (SDSU), Brookings, SD, USA.
- BioSNTR, SDSU, Brookings, SD, USA.
| | - Brandon L Scott
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology (South Dakota Mines), Rapid City, SD, USA.
- BioSNTR, South Dakota Mines, Rapid City, SD, USA.
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Ritter M, Bresgen N, Kerschbaum HH. From Pinocytosis to Methuosis-Fluid Consumption as a Risk Factor for Cell Death. Front Cell Dev Biol 2021; 9:651982. [PMID: 34249909 PMCID: PMC8261248 DOI: 10.3389/fcell.2021.651982] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 04/29/2021] [Indexed: 12/11/2022] Open
Abstract
The volumes of a cell [cell volume (CV)] and its organelles are adjusted by osmoregulatory processes. During pinocytosis, extracellular fluid volume equivalent to its CV is incorporated within an hour and membrane area equivalent to the cell's surface within 30 min. Since neither fluid uptake nor membrane consumption leads to swelling or shrinkage, cells must be equipped with potent volume regulatory mechanisms. Normally, cells respond to outwardly or inwardly directed osmotic gradients by a volume decrease and increase, respectively, i.e., they shrink or swell but then try to recover their CV. However, when a cell death (CD) pathway is triggered, CV persistently decreases in isotonic conditions in apoptosis and it increases in necrosis. One type of CD associated with cell swelling is due to a dysfunctional pinocytosis. Methuosis, a non-apoptotic CD phenotype, occurs when cells accumulate too much fluid by macropinocytosis. In contrast to functional pinocytosis, in methuosis, macropinosomes neither recycle nor fuse with lysosomes but with each other to form giant vacuoles, which finally cause rupture of the plasma membrane (PM). Understanding methuosis longs for the understanding of the ionic mechanisms of cell volume regulation (CVR) and vesicular volume regulation (VVR). In nascent macropinosomes, ion channels and transporters are derived from the PM. Along trafficking from the PM to the perinuclear area, the equipment of channels and transporters of the vesicle membrane changes by retrieval, addition, and recycling from and back to the PM, causing profound changes in vesicular ion concentrations, acidification, and-most importantly-shrinkage of the macropinosome, which is indispensable for its proper targeting and cargo processing. In this review, we discuss ion and water transport mechanisms with respect to CVR and VVR and with special emphasis on pinocytosis and methuosis. We describe various aspects of the complex mutual interplay between extracellular and intracellular ions and ion gradients, the PM and vesicular membrane, phosphoinositides, monomeric G proteins and their targets, as well as the submembranous cytoskeleton. Our aim is to highlight important cellular mechanisms, components, and processes that may lead to methuotic CD upon their derangement.
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Affiliation(s)
- Markus Ritter
- Center for Physiology, Pathophysiology and Biophysics, Institute for Physiology and Pathophysiology, Paracelsus Medical University, Salzburg, Austria
- Institute for Physiology and Pathophysiology, Paracelsus Medical University, Nuremberg, Germany
- Gastein Research Institute, Paracelsus Medical University, Salzburg, Austria
- Ludwig Boltzmann Institute for Arthritis und Rehabilitation, Salzburg, Austria
- Kathmandu University School of Medical Sciences, Dhulikhel, Nepal
| | - Nikolaus Bresgen
- Department of Biosciences, University of Salzburg, Salzburg, Austria
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Camblor-Perujo S, Kononenko NL. Brain-specific functions of the endocytic machinery. FEBS J 2021; 289:2219-2246. [PMID: 33896112 DOI: 10.1111/febs.15897] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 03/29/2021] [Indexed: 12/12/2022]
Abstract
Endocytosis is an essential cellular process required for multiple physiological functions, including communication with the extracellular environment, nutrient uptake, and signaling by the cell surface receptors. In a broad sense, endocytosis is accomplished through either constitutive or ligand-induced invagination of the plasma membrane, which results in the formation of the plasma membrane-retrieved endocytic vesicles, which can either be sent for degradation to the lysosomes or recycled back to the PM. This additional function of endocytosis in membrane retrieval has been adopted by excitable cells, such as neurons, for membrane equilibrium maintenance at synapses. The last two decades were especially productive with respect to the identification of brain-specific functions of the endocytic machinery, which additionally include but not limited to regulation of neuronal differentiation and migration, maintenance of neuron morphology and synaptic plasticity, and prevention of neurotoxic aggregates spreading. In this review, we highlight the current knowledge of brain-specific functions of endocytic machinery with a specific focus on three brain cell types, neuronal progenitor cells, neurons, and glial cells.
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Affiliation(s)
| | - Natalia L Kononenko
- CECAD Cluster of Excellence, University of Cologne, Germany.,Center for Physiology & Pathophysiology, Medical Faculty, University of Cologne, Germany
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35
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Li J, Meng Q, Fu Y, Yu X, Ji T, Chao Y, Chen Q, Li Y, Bian H. Novel insights: Dynamic foam cells derived from the macrophage in atherosclerosis. J Cell Physiol 2021; 236:6154-6167. [PMID: 33507545 DOI: 10.1002/jcp.30300] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/22/2020] [Accepted: 01/15/2021] [Indexed: 12/12/2022]
Abstract
Atherosclerosis can be regarded as a chronic disease derived from the interaction between disordered lipoproteins and an unsuitable immune response. The evolution of foam cells is not only a significant pathological change in the early stage of atherosclerosis but also a key stage in the occurrence and development of atherosclerosis. The formation of foam cells is mainly caused by the imbalance among lipids uptake, lipids treatment, and reverse cholesterol transport. Although a large number of studies have summarized the source of foam cells and the mechanism of foam cells formation, we propose a new idea about foam cells in atherosclerosis. Rather than an isolated microenvironment, the macrophage multiple lipid uptake pathways, lipid internalization, lysosome, mitochondria, endoplasmic reticulum, neutral cholesterol ester hydrolase (NCEH), acyl-coenzyme A-cholesterol acyltransferase (ACAT), and reverse cholesterol transport are mutually influential, and form a dynamic process under multi-factor regulation. The macrophage takes on different uptake lipid statuses depending on multiple uptake pathways and intracellular lipids, lipid metabolites versus pro-inflammatory factors. Except for NCEH and ACAT, the lipid internalization of macrophages also depends on multicellular organelles including the lysosome, mitochondria, and endoplasmic reticulum, which are associated with each other. A dynamic balance between esterification and hydrolysis of cholesterol for macrophages is essential for physiology and pathology. Therefore, we propose that the foam cell in the process of atherosclerosis may be dynamic under multi-factor regulation, and collate this study to provide a holistic and dynamic idea of the foam cell.
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Affiliation(s)
- Jun Li
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Qinghai Meng
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yu Fu
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xichao Yu
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Tingting Ji
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Ying Chao
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Qi Chen
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yu Li
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Huimin Bian
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China.,Jiangsu Key Laboratory of Therapeutic Material of Chinese Medicine, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China
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Dixit UG, Rodríguez NE, Polando R, McDowell MA, Wilson ME. Complement receptor 3 mediates ruffle-like, actin-rich aggregates during phagocytosis of Leishmania infantum metacyclics. Exp Parasitol 2021; 220:107968. [PMID: 32781093 PMCID: PMC7750307 DOI: 10.1016/j.exppara.2020.107968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 08/05/2020] [Accepted: 08/05/2020] [Indexed: 11/18/2022]
Abstract
The parasitic protozoan Leishmania infantum resides primarily in macrophages throughout mammalian infection. Infection is initiated by deposition of the metacyclic promastigote into the dermis of a mammalian host by the sand fly vector. Promastigotes enter macrophages by ligating surface receptors such as complement receptor 3 (CR3), inducing phagocytosis of the parasite. At the binding site of metacyclic promastigotes, we observed large asymmetrical aggregates of macrophage membrane with underlying actin, resembling membrane ruffles. Actin accumulation was observed at the point of initial contact, before phagosome formation and accumulation of peri-phagosomal actin. Ruffle-like structures did not form during phagocytosis of attenuated promastigotes or during phagocytosis of the intracellular amastigote form of L. infantum. Entry of promastigotes through massive actin accumulation was associated with a subsequent delay in fusion of the parasitophorous vacuole (PV) with the lysosomal markers LAMP-1 and Cathepsin D. Actin accumulation was also associated with entry through CR3, since macrophages from CD11b knockout (KO) mice did not form massive aggregates of actin during phagocytosis of metacyclic promastigotes. Furthermore, intracellular survival of L. infantum was significantly decreased in CD11b KO compared to wild type macrophages, although entry rates were similar. We conclude that both promastigote virulence and host cell CR3 are needed for the formation of ruffle-like membrane structures at the site of metacyclic promastigote phagocytosis, and that formation of actin-rich aggregates during entry correlates with the intracellular survival of virulent promastigotes.
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Affiliation(s)
- Upasna Gaur Dixit
- Department of Internal Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Nilda E Rodríguez
- Department of Biology, University of Northern Iowa, Cedar Falls, IA, 50614, USA.
| | - Rachel Polando
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Mary Ann McDowell
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Mary E Wilson
- Department of Internal Medicine, University of Iowa, Iowa City, IA, 52242, USA; Department of Microbiology and Immunology, University of Iowa, Iowa City, IA, 52242, USA; Veterans' Affairs Medical Center, Iowa City, IA, 52242, USA
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Jia R, Cui K, Li Z, Gao Y, Zhang B, Wang Z, Cui J. NK cell-derived exosomes improved lung injury in mouse model of Pseudomonas aeruginosa lung infection. J Physiol Sci 2020; 70:50. [PMID: 33096976 PMCID: PMC10717361 DOI: 10.1186/s12576-020-00776-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/28/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND Pseudomonas aeruginosa (PA) is one of the most common bacteria that causes lung infection in hospital. The aim of our study is to explore the role and action mechanism of NK cells in lung PA infection. METHODS In this present study, 2.5 × 108 CFU/mouse PA was injected into murine trachea to make lung PA infection mouse model. Anti-asialo GM1 was used to inhibit NK cell. The percentage of NK cells was ensured by flow cytometry, and the M1- and M2-polarized macrophages were determined by flow cytometry, qRT-PCR, and ELISA assay. Besides, H&E staining was performed to ensure the pathological changes in lung tissues. Transmission electron microscopy and western blot were carried out to identify the exosome. RESULTS Here, in the mouse model of PA lung infection, NK cell depletion caused M2 polarization of lung macrophage, and exacerbated PA-induced lung injury. Next, our data shown that M2 macrophage polarization was enhanced when the generation of NK cell-derived exosome was blocked in the co-culture system of NK cells and macrophages. Subsequently, we demonstrated that NK cells promoted M1 macrophage polarization both in PA-infected macrophage and the mouse model of PA lung infection, and attenuated lung injury through exosome. CONCLUSION Overall, our data proved that NK cell may improve PA-induced lung injury through promoting M1 lung macrophage polarization by secreting exosome. Our results provide a new idea for the treatment of PA lung infection.
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Affiliation(s)
- Ruiqi Jia
- Respiratory Intensive Care Unit, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China
| | - Kuili Cui
- Tuberculosis Medicine, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China
| | - Zhenkui Li
- Tuberculosis Medicine, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China
| | - Yuan Gao
- Tuberculosis Medicine, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China
| | - Bianfang Zhang
- Tuberculosis Medicine, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China
| | - Zhixia Wang
- Respiratory Medicine, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China
| | - Junwei Cui
- Tuberculosis Medicine, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Xinxiang, 453003, China.
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38
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Bashant KR, Aponte AM, Randazzo D, Rezvan Sangsari P, Wood AJ, Bibby JA, West EE, Vassallo A, Manna ZG, Playford MP, Jordan N, Hasni S, Gucek M, Kemper C, Conway Morris A, Morgan NY, Toepfner N, Guck J, Mehta NN, Chilvers ER, Summers C, Kaplan MJ. Proteomic, biomechanical and functional analyses define neutrophil heterogeneity in systemic lupus erythematosus. Ann Rheum Dis 2020; 80:209-218. [PMID: 32988843 DOI: 10.1136/annrheumdis-2020-218338] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 08/18/2020] [Accepted: 08/21/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Low-density granulocytes (LDGs) are a distinct subset of proinflammatory and vasculopathic neutrophils expanded in systemic lupus erythematosus (SLE). Neutrophil trafficking and immune function are intimately linked to cellular biophysical properties. This study used proteomic, biomechanical and functional analyses to further define neutrophil heterogeneity in the context of SLE. METHODS Proteomic/phosphoproteomic analyses were performed in healthy control (HC) normal density neutrophils (NDNs), SLE NDNs and autologous SLE LDGs. The biophysical properties of these neutrophil subsets were analysed by real-time deformability cytometry and lattice light-sheet microscopy. A two-dimensional endothelial flow system and a three-dimensional microfluidic microvasculature mimetic (MMM) were used to decouple the contributions of cell surface mediators and biophysical properties to neutrophil trafficking, respectively. RESULTS Proteomic and phosphoproteomic differences were detected between HC and SLE neutrophils and between SLE NDNs and LDGs. Increased abundance of type 1 interferon-regulated proteins and differential phosphorylation of proteins associated with cytoskeletal organisation were identified in SLE LDGs relative to SLE NDNs. The cell surface of SLE LDGs was rougher than in SLE and HC NDNs, suggesting membrane perturbances. While SLE LDGs did not display increased binding to endothelial cells in the two-dimensional assay, they were increasingly retained/trapped in the narrow channels of the lung MMM. CONCLUSIONS Modulation of the neutrophil proteome and distinct changes in biophysical properties are observed alongside differences in neutrophil trafficking. SLE LDGs may be increasingly retained in microvasculature networks, which has important pathogenic implications in the context of lupus organ damage and small vessel vasculopathy.
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Affiliation(s)
- Kathleen R Bashant
- NIAMS, National Institutes of Health, Bethesda, Maryland, USA.,Department of Medicine, University of Cambridge, Cambridge, Cambridgeshire, UK
| | - Angel M Aponte
- NHLBI, National Institutes of Health, Bethesda, Maryland, USA
| | - Davide Randazzo
- NIAMS, National Institutes of Health, Bethesda, Maryland, USA
| | | | - Alexander Jt Wood
- Department of Medicine, University of Cambridge, Cambridge, Cambridgeshire, UK
| | - Jack A Bibby
- NHLBI, National Institutes of Health, Bethesda, Maryland, USA
| | - Erin E West
- NHLBI, National Institutes of Health, Bethesda, Maryland, USA
| | - Arlette Vassallo
- Department of Medicine, University of Cambridge, Cambridge, Cambridgeshire, UK
| | - Zerai G Manna
- NIAMS, National Institutes of Health, Bethesda, Maryland, USA
| | | | - Natasha Jordan
- Rheumatology Department, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Sarfaraz Hasni
- NIAMS, National Institutes of Health, Bethesda, Maryland, USA
| | - Marjan Gucek
- NHLBI, National Institutes of Health, Bethesda, Maryland, USA
| | - Claudia Kemper
- NHLBI, National Institutes of Health, Bethesda, Maryland, USA
| | | | - Nicole Y Morgan
- NIBIB, National Institutes of Health, Bethesda, Maryland, USA
| | - Nicole Toepfner
- Department of Pediatrics/Carl Gustav Carus University Hospital, Technical University Dresden, Dresden, Sachsen, Germany
| | - Jochen Guck
- Biological Optomechanics Division, Max Planck Institute for the Science of Light, Erlangen, Bayern, Germany
| | - Nehal N Mehta
- NHLBI, National Institutes of Health, Bethesda, Maryland, USA
| | | | - Charlotte Summers
- Department of Medicine, University of Cambridge, Cambridge, Cambridgeshire, UK
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Haider P, Kral-Pointner JB, Mayer J, Richter M, Kaun C, Brostjan C, Eilenberg W, Fischer MB, Speidl WS, Hengstenberg C, Huber K, Wojta J, Hohensinner P. Neutrophil Extracellular Trap Degradation by Differently Polarized Macrophage Subsets. Arterioscler Thromb Vasc Biol 2020; 40:2265-2278. [PMID: 32673525 PMCID: PMC7447175 DOI: 10.1161/atvbaha.120.314883] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Supplemental Digital Content is available in the text. Macrophages are immune cells, capable to remodel the extracellular matrix, which can harbor extracellular DNA incorporated into neutrophil extracellular traps (NETs). To study the breakdown of NETs we studied the capability of macrophage subsets to degrade these structures in vitro and in vivo in a murine thrombosis model. Furthermore, we analyzed human abdominal aortic aneurysm samples in support of our in vitro and in vivo results.
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Affiliation(s)
- Patrick Haider
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Julia B Kral-Pointner
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria.,Ludwig Boltzmann Institute for Cardiovascular Research, Austria (J.B.K.-P., J.W.)
| | - Julia Mayer
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Manuela Richter
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Christoph Kaun
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Christine Brostjan
- Division of Vascular Surgery and Surgical Research Laboratories, Department of Surgery (C.B., W.E.), Medical University of Vienna, Austria
| | - Wolf Eilenberg
- Division of Vascular Surgery and Surgical Research Laboratories, Department of Surgery (C.B., W.E.), Medical University of Vienna, Austria
| | - Michael B Fischer
- Department of Blood Group Serology and Transfusion Medicine (M.B.F.), Medical University of Vienna, Austria.,Department of Biomedical Research, Danube University Krems, Austria (M.B.F.)
| | - Walter S Speidl
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Christian Hengstenberg
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
| | - Kurt Huber
- Wilhelminenhospital, 3rd Department of Medicine, Cardiology and Intensive Care Medicine, Vienna, Austria (K.H.).,Sigmund Freud University, Medical Faculty, Vienna, Austria (K.H.)
| | - Johann Wojta
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria.,Ludwig Boltzmann Institute for Cardiovascular Research, Austria (J.B.K.-P., J.W.).,Medical University of Vienna, Core Facilities, Austria (J.W.)
| | - Philipp Hohensinner
- From the Division of Cardiology, Department of Medicine II (P. Haider, J.B.K.-P., J.M., M.R., C.K., W.S.S., C.H., J.W., P. Hohensinner), Medical University of Vienna, Austria
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Yang J, Li X, Xu D. Research Progress on the Involvement of ANGPTL4 and Loss-of-Function Variants in Lipid Metabolism and Coronary Heart Disease: Is the "Prime Time" of ANGPTL4-Targeted Therapy for Coronary Heart Disease Approaching? Cardiovasc Drugs Ther 2020; 35:467-477. [PMID: 32500296 DOI: 10.1007/s10557-020-07001-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Multiple genetic studies have confirmed the definitive link among the loss-of-function variants of angiogenin-like protein 4 (ANGPTL4), significantly decreased plasma triglyceride (TG) levels, and reduced risk of coronary heart disease (CHD). The potential therapeutic effect of ANGPTL4 on dyslipidemia and CHD has been widely studied. OBJECTIVE This review provides a detailed introduction to the research progress on the involvement of ANGPTL4 in lipid metabolism and atherosclerosis and evaluates the efficacy and safety of ANGPTL4 as a therapeutic target for CHD. RELEVANT FINDINGS By inhibiting lipoprotein lipase (LPL) activity, ANGPTL4 plays a vital role in the regulation of lipid metabolism and energy balance. However, the role of ANGPTL4 in regulating lipid metabolism is tissue-specific. ANGPTL4 acts as a locally released LPL inhibitor in the heart, skeletal muscle and small intestine, while ANGPTL4 derived from liver and adipose tissue mainly acts as an endocrine factor that regulates systemic lipid metabolism. As a multifunctional protein, ANGPTL4 also inhibits the formation of foam cells in macrophages, exerting an anti-atherogenic role. The function of ANGPTL4 in endothelial cells is still uncertain. The safety of ANGPTL4 monoclonal antibodies requires further evaluation due to their potential adverse effects. CONCLUSION The biological characteristics of ANGPTL4 are much more complex than those demonstrated by genetic studies. Future studies must elucidate how to effectively reduce the risk of CHD while avoiding potential atherogenic effects and other complications before the "prime time" of ANGPTL4-targeted therapy arrives.
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Affiliation(s)
- Jingmin Yang
- Department of Cardiology, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, 410000, Hunan, China
| | - Xiao Li
- Department of Cardiology, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, 410000, Hunan, China
| | - Danyan Xu
- Department of Cardiology, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, 410000, Hunan, China.
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Signaling Pathways Potentially Responsible for Foam Cell Formation: Cholesterol Accumulation or Inflammatory Response-What is First? Int J Mol Sci 2020; 21:ijms21082716. [PMID: 32295185 PMCID: PMC7216009 DOI: 10.3390/ijms21082716] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/03/2020] [Accepted: 04/07/2020] [Indexed: 02/07/2023] Open
Abstract
Accumulation of lipid-laden (foam) cells in the arterial wall is known to be the earliest step in the pathogenesis of atherosclerosis. There is almost no doubt that atherogenic modified low-density lipoproteins (LDL) are the main sources of accumulating lipids in foam cells. Atherogenic modified LDL are taken up by arterial cells, such as macrophages, pericytes, and smooth muscle cells in an unregulated manner bypassing the LDL receptor. The present study was conducted to reveal possible common mechanisms in the interaction of macrophages with associates of modified LDL and non-lipid latex particles of a similar size. To determine regulatory pathways that are potentially responsible for cholesterol accumulation in human macrophages after the exposure to naturally occurring atherogenic or artificially modified LDL, we used transcriptome analysis. Previous studies of our group demonstrated that any type of LDL modification facilitates the self-association of lipoprotein particles. The size of such self-associates hinders their interaction with a specific LDL receptor. As a result, self-associates are taken up by nonspecific phagocytosis bypassing the LDL receptor. That is why we used latex beads as a stimulator of macrophage phagocytotic activity. We revealed at least 12 signaling pathways that were regulated by the interaction of macrophages with the multiple-modified atherogenic naturally occurring LDL and with latex beads in a similar manner. Therefore, modified LDL was shown to stimulate phagocytosis through the upregulation of certain genes. We have identified at least three genes (F2RL1, EIF2AK3, and IL15) encoding inflammatory molecules and associated with signaling pathways that were upregulated in response to the interaction of modified LDL with macrophages. Knockdown of two of these genes, EIF2AK3 and IL15, completely suppressed cholesterol accumulation in macrophages. Correspondingly, the upregulation of EIF2AK3 and IL15 promoted cholesterol accumulation. These data confirmed our hypothesis of the following chain of events in atherosclerosis: LDL particles undergo atherogenic modification; this is accompanied by the formation of self-associates; large LDL associates stimulate phagocytosis; as a result of phagocytosis stimulation, pro-inflammatory molecules are secreted; these molecules cause or at least contribute to the accumulation of intracellular cholesterol. This chain of events may explain the relationship between cholesterol accumulation and inflammation. The primary sequence of events in this chain is related to inflammatory response rather than cholesterol accumulation.
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Salvianolic Acid A Ameliorates Early-Stage Atherosclerosis Development by Inhibiting NLRP3 Inflammasome Activation in Zucker Diabetic Fatty Rats. Molecules 2020; 25:molecules25051089. [PMID: 32121151 PMCID: PMC7179142 DOI: 10.3390/molecules25051089] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 02/21/2020] [Accepted: 02/26/2020] [Indexed: 12/25/2022] Open
Abstract
Salvianolic acid A (SAA), an important bioactive polyphenolic acid found in Salvia miltiorrhiza Bunge, may be used for treating metabolic disorders due to its anti-inflammatory activity. Since chronic inflammation plays an important role in type 2 diabetes mellitus (T2DM) complicated with atherosclerosis (AS), SAA may have beneficial effects on AS. Here, we evaluated the effects of SAA on metabolic disorders in male Zucker diabetic fatty (ZDF) rats induced by a high-fat diet and Vitamin D3 injections. Compared with the model group, the SAA high dosage (1 mg/kg) group exhibited decreased hemoglobin A1C levels but unchanged blood glucose levels. The disrupted lipid profiles were ameliorated by SAA, with significantly decreased levels of blood cholesterol, LDL-C and triglyceride. The protective effects of SAA against early AS were further confirmed by histopathological examination of aortic tissues. In addition, we observed that SAA decreased serum hs-CRP levels and suppressed the activation of NLRP3 inflammasome and NF-κB signaling in aortic tissues of ZDF rats. Collectively, our results demonstrate the potential of SAA to alleviate AS and T2DM in ZDF rats as a result of its anti-inflammatory effects.
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The Antitumor Efficacy of β-Elemene by Changing Tumor Inflammatory Environment and Tumor Microenvironment. BIOMED RESEARCH INTERNATIONAL 2020; 2020:6892961. [PMID: 32149121 PMCID: PMC7054771 DOI: 10.1155/2020/6892961] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 01/21/2020] [Indexed: 02/06/2023]
Abstract
Inflammatory mediators and inflammatory cells in the inflammatory microenvironment promote the transformation of normal cells to cancer cells in the early stage of cancer, promote the growth and development of cancer cells, and induce tumor immune escape. The monomeric active ingredient β-elemene is extracted from the traditional Chinese medicine Curcuma wenyujin and has been proven to have good anti-inflammatory and antitumor activities in clinical applications for more than 20 years in China. Recent studies have found that this traditional Chinese medicine plays a vital role in macrophage infiltration and M2 polarization, as well as in regulating immune disorders, and it even regulates the transcription factors NF-κB and STAT3 to alter inflammation, tumorigenesis, and development. In addition, β-elemene regulates not only different inflammatory factors (such as TNF-α, IFN, TGF-β, and IL-6/10) but also oxidative stress in vivo and in vitro. The excellent anti-inflammatory and antitumor effects of β-elemene and its ability to alter the inflammatory microenvironment of tumors have been gradually elaborated. Although the study of monomeric active ingredients in traditional Chinese medicines is insufficient in terms of quality and quantity, the pharmacological effects of more active ingredients of traditional Chinese medicines will be revealed after β-elemene.
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Interleukin 10 promotes macrophage uptake of HDL and LDL by stimulating fluid-phase endocytosis. Biochim Biophys Acta Mol Cell Biol Lipids 2019; 1865:158537. [PMID: 31676439 DOI: 10.1016/j.bbalip.2019.158537] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 09/06/2019] [Accepted: 09/19/2019] [Indexed: 01/01/2023]
Abstract
OBJECTIVE Highly elevated plasma levels of interleukin-10 (IL-10) are causally associated with "Disappearing HDL Syndrome" and low plasma LDL-cholesterol, but the underlying mechanism is poorly understood. Fluid-phase endocytosis, a process highly dependent on actin dynamics, enables cells to internalize relatively high amounts of extracellular fluids and solutes. We sought to investigate whether IL-10 induces lipoprotein uptake by fluid-phase endocytosis in macrophages. METHODS AND RESULTS Macrophages (RAW264.7, Kupffer and human) were incubated with vehicle (PBS) or IL-10 (20 ng/ml) for 7 days. Uptake of HDL, LDL, and/or fluid-phase endocytosis probes (albumin-Alexa680®, 70 kDa FITC-Dextran and Lucifer Yellow, LY) was evaluated by FACS. Intracellular cofilin and phosphorylated cofilin (p-cofilin) levels were determined by immunoblotting. Macrophage uptake of lipoproteins and probes was non-saturable and increased after IL-10 incubation (p < 0.0001). Furthermore, pre-incubation with fluid-phase endocytosis inhibitors (LY294002, Latrunculin A, and Amiloride) significantly reduced uptake (p < 0.05). IL-10 increased the cofilin/p-cofilin ratio (p = 0.021), signifying increased cofilin activation and hence filamentous actin. Consistently, phalloidin staining revealed increased filamentous actin in macrophages after IL-10 treatment (p = 0.0018). Finally, RNA-seq analysis demonstrated enrichment of gene sets related to actin filament dynamics, membrane ruffle formation and endocytosis in IL-10-treated macrophages (p < 0.05). IL-10 did not alter mRNA levels of Ldlr, Vldlr, Scarb1, Cd36 or Lrp1. In primary human monocyte-derived macrophages and murine Kupffer cells, IL-10 incubation also increased uptake of lipoproteins, albumin and LY (p < 0.01). CONCLUSIONS Interleukin-10 induces the uptake of HDL and LDL by fluid-phase endocytosis by increasing actin-filament rearrangement in macrophages, thus providing a plausible mechanism contributing to "Disappearing HDL Syndrome".
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Swanson JA, King JS. The breadth of macropinocytosis research. Philos Trans R Soc Lond B Biol Sci 2019; 374:20180146. [PMID: 30967000 PMCID: PMC6304736 DOI: 10.1098/rstb.2018.0146] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2018] [Indexed: 11/12/2022] Open
Affiliation(s)
- Joel A. Swanson
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI 48109-5620, USA
| | - Jason S. King
- Department of Biomedical Sciences, University of Sheffield, Sheffield S10 2TT, UK
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