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Getz GS, Reardon CA. ILRUNing to Atherosclerosis. Arterioscler Thromb Vasc Biol 2022; 42:1152-1153. [PMID: 35924556 DOI: 10.1161/atvbaha.122.318107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, IL (G.S.G.)
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Getz GS, Reardon CA, Boren J. Editorial: Diabetes Augmentation on Vascular Disease. Front Cardiovasc Med 2021; 8:810822. [PMID: 34950721 PMCID: PMC8688963 DOI: 10.3389/fcvm.2021.810822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 11/18/2021] [Indexed: 11/17/2022] Open
Affiliation(s)
- Godfrey S. Getz
- Department of Pathology, University of Chicago, Chicago, IL, United States
- *Correspondence: Godfrey S. Getz
| | | | - Jan Boren
- Department of Molecular and Clinical Medicine, University of Gothenburg, Gothenburg, Sweden
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3
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Abstract
PURPOSE OF REVIEW Lipoproteins have significant role in both the promotion and prevention of atherosclerosis. This brief review will focus on recent reports on relationship between HDL and HDL subclasses and their composition and function, the role of apoC-III in metabolism of triglyceride-rich lipoproteins, the impact of Lipoprotein (a) (Lp(a)) on endothelial cells, and the mechanism of uptake of aggregated LDL by macrophages. RECENT FINDINGS The complexity of the protein and lipid content of murine and human HDL and their relationship to its cholesterol efflux capacity have been examined. HDL has also been shown to have both antiatherogenic and proatherogenic properties. The relationship between apoC-III and LPL activity, apoprotein E mediated clearance of triglyceride-rich lipoproteins and the potential importance of apoC-III in the increased risk of cardiovascular disease in type 1 diabetics has been investigated. Oxidized phospholipid in Lp(a) promotes endothelial cells inflammatory and glycolytic responses. TLR4 participates in the uptake of aggregated LDL to contribute to foam cell formation. SUMMARY These studies contribute to our mechanistic understanding of how lipoproteins contribute to atherogenesis and identify potential therapeutic targets.
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Biswas TK, VanderLaan PA, Que X, Gonen A, Krishack P, Binder CJ, Witztum JL, Getz GS, Reardon CA. CD1d Selectively Down Regulates the Expression of the Oxidized Phospholipid-Specific E06 IgM Natural Antibody in Ldlr-/- Mice. Antibodies (Basel) 2020; 9:antib9030030. [PMID: 32635160 PMCID: PMC7551411 DOI: 10.3390/antib9030030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/13/2020] [Accepted: 06/29/2020] [Indexed: 12/30/2022] Open
Abstract
Natural antibodies (NAbs) are important regulators of tissue homeostasis and inflammation and are thought to have diverse protective roles in a variety of pathological states. E06 is a T15 idiotype IgM NAb exclusively produced by B-1 cells, which recognizes the phosphocholine (PC) head group in oxidized phospholipids on the surface of apoptotic cells and in oxidized LDL (OxLDL), and the PC present on the cell wall of Streptococcus pneumoniae. Here we report that titers of the E06 NAb are selectively increased several-fold in Cd1d-deficient mice, whereas total IgM and IgM antibodies recognizing other oxidation specific epitopes such as in malondialdehyde-modified LDL (MDA-LDL) and OxLDL were not increased. The high titers of E06 in Cd1d-deficient mice are not due to a global increase in IgM-secreting B-1 cells, but they are specifically due to an expansion of E06-secreting splenic B-1 cells. Thus, CD1d-mediated regulation appeared to be suppressive in nature and specific for E06 IgM-secreting cells. The CD1d-mediated regulation of the E06 NAb generation is a novel mechanism that regulates the production of this specific oxidation epitope recognizing NAb.
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Affiliation(s)
- Tapan K. Biswas
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA; (T.K.B.); (P.A.V.); (P.K.)
| | - Paul A. VanderLaan
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA; (T.K.B.); (P.A.V.); (P.K.)
- Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
| | - Xuchu Que
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA; (X.Q.); (A.G.); (J.L.W.)
| | - Ayelet Gonen
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA; (X.Q.); (A.G.); (J.L.W.)
| | - Paulette Krishack
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA; (T.K.B.); (P.A.V.); (P.K.)
| | - Christoph J. Binder
- Department of Laboratory Medicine, Medical University of Vienna, Vienna 1090, Austria;
| | - Joseph L. Witztum
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA; (X.Q.); (A.G.); (J.L.W.)
| | - Godfrey S. Getz
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA; (T.K.B.); (P.A.V.); (P.K.)
- Correspondence: (G.S.G.); (C.A.R.)
| | - Catherine A. Reardon
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA; (T.K.B.); (P.A.V.); (P.K.)
- Correspondence: (G.S.G.); (C.A.R.)
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5
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Abstract
This overview briefly summarizes the cellular pathobiology of experimental atherosclerosis and is then followed by a consideration of how 3 major risk factors interact with the hypothesized pathogenetic process. First, since hemodynamics and blood flow influence the localization of atherosclerotic plaques, possible mechanisms and directions of research are considered. Secondly, the recent hypothesis relating the oxidation of LDL to several of the early processes of atherogenesis is briefly discussed in view of the fact that hyperlipidemia is a major risk factor. The possibility that subsets of LDL and lipoproteins other than LDL might be involved is also discussed. Family history is the last of the 3 contributors to atherosclerosis reviewed and some prototypes of gene abnormalities are considered. Finally, the needs and prospects of future research are summarized.
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Affiliation(s)
- Godfrey S. Getz
- Department of Pathology, The University of Chicago, 5841 S. Maryland Avenue, Chicago, Illinois 60637
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7
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Rodriguez A, Trigatti BL, Mineo C, Knaack D, Wilkins JT, Sahoo D, Asztalos BF, Mora S, Cuchel M, Pownall HJ, Rosales C, Bernatchez P, Ribeiro Martins da Silva A, Getz GS, Barber JL, Shearer GC, Zivkovic AM, Tietge UJF, Sacks FM, Connelly MA, Oda MN, Davidson WS, Sorci-Thomas MG, Vaisar T, Ruotolo G, Vickers KC, Martel C. Proceedings of the Ninth HDL (High-Density Lipoprotein) Workshop: Focus on Cardiovascular Disease. Arterioscler Thromb Vasc Biol 2019; 39:2457-2467. [PMID: 31597448 DOI: 10.1161/atvbaha.119.313340] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The HDL (high-density lipoprotein) Workshop was established in 2009 as a forum for candid discussions among academic basic scientists, clinical investigators, and industry researchers about the role of HDL in cardiovascular disease. This ninth HDL Workshop was held on May 16 to 17, 2019 in Boston, MA, and included outstanding oral presentations from established and emerging investigators. The Workshop featured 5 sessions with topics that tackled the role of HDL in the vasculature, its structural complexity, its role in health and disease states, and its interaction with the intestinal microbiome. The highlight of the program was awarding the Jack Oram Award to the distinguished professor emeritus G.S. Getz from the University of Chicago. The tenth HDL Workshop will be held on May 2020 in Chicago and will continue the focus on intellectually stimulating presentations by established and emerging investigators on novel roles of HDL in cardiovascular and noncardiovascular health and disease states.
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Affiliation(s)
- Annabelle Rodriguez
- From the Center for Vascular Biology, Department of Cell Biology, University of Connecticut Health, Farmington (A.R.)
| | - Bernardo L Trigatti
- Department of Biochemistry and Biomedical Sciences, McMaster University, and Thrombosis and Atherosclerosis Research Institute, McMaster University and Hamilton Health Sciences, Hamilton, ON, Canada (B.L.T.)
| | - Chieko Mineo
- Center for Pulmonary and Vascular Biology, Department of Pediatrics and Cell Biology, University of Texas Southwestern Medical Center, Dallas (C.M.)
| | - Darcy Knaack
- Department of Biochemistry (D.K., D.S.), Medical College of Wisconsin, Milwaukee
| | - John T Wilkins
- Division of Cardiology, Departments of Medicine and of Preventive Medicine, Northwestern University, Chicago, IL (J.T.W.)
| | - Daisy Sahoo
- Department of Biochemistry (D.K., D.S.), Medical College of Wisconsin, Milwaukee.,Division of Endocrinology (D.S., M.G.S.-T.), Medical College of Wisconsin, Milwaukee
| | - Bela F Asztalos
- Human Nutrition Research Center, Tufts University, Boston, MA (B.F.A.)
| | - Samia Mora
- Center for Lipid Metabolomics, Divisions of Preventive and Cardiovascular Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (S.M.)
| | - Marina Cuchel
- Division of Translational Medicine and Human Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia (M.C.)
| | - Henry J Pownall
- Institute for Academic Medicine, Houston Methodist, Weill Cornell Medical College, Houston, TX (H.J.P., C.R.)
| | - Corina Rosales
- Institute for Academic Medicine, Houston Methodist, Weill Cornell Medical College, Houston, TX (H.J.P., C.R.)
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Heart and Lung Innovation Centre, St Paul's Hospital, Vancouver, BC, Canada (P.B.)
| | | | - Godfrey S Getz
- Department of Pathology, University of Chicago, IL (G.S.G.)
| | - Jacob L Barber
- Department of Exercise Science, University of South Carolina, Columbia (J.L.B.)
| | - Gregory C Shearer
- Department Nutritional Sciences, The Pennsylvania State University, University Park (G.C.S.)
| | | | - Uwe J F Tietge
- Division of Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden (U.J.F.T.).,Clinical Chemistry, Karolinska University Laboratory, Karolinska University Hospital, Stockholm, Sweden (U.J.F.T.)
| | - Frank M Sacks
- Harvard T.H. Chan School of Public Health, Boston, MA (F.M.S.)
| | - Margery A Connelly
- Laboratory Corporation of America Holdings (LabCorp), Morrisville, NC (M.A.C.)
| | | | - W Sean Davidson
- Department of Pathology and Laboratory Medicine, University of Cincinnati, OH (W.S.D.)
| | - Mary G Sorci-Thomas
- Division of Endocrinology (D.S., M.G.S.-T.), Medical College of Wisconsin, Milwaukee
| | - Tomas Vaisar
- UW Medicine Diabetes Institute, University of Washington, Seattle (T.V.)
| | | | - Kasey C Vickers
- Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN (K.C.V.)
| | - Catherine Martel
- Montreal Heart Institute, Montreal and Department of Medicine, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada (C.M.)
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VanderLaan PA, Reardon CA, Cabana VG, Wang CR, Getz GS. Invariant Natural Killer T-Cells and Total CD1d Restricted Cells Differentially Influence Lipid Metabolism and Atherosclerosis in Low Density Receptor Deficient Mice. Int J Mol Sci 2019; 20:ijms20184566. [PMID: 31540125 PMCID: PMC6770011 DOI: 10.3390/ijms20184566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/05/2019] [Accepted: 09/11/2019] [Indexed: 11/16/2022] Open
Abstract
Natural killer T (NKT) cells are a distinct subset of lymphocytes that bridge the innate and adaptive immune response and can be divided into type I invariant NKT cells (iNKT) and type II NKT cells. The objective of this study is to examine the effects of NKT cell on lipid metabolism and the initiation and progression of atherosclerosis in LDL receptor deficient (LDLR−/−) mice. Mice were fed an atherogenic diet for 4 or 8 weeks and plasma lipids, lipoproteins, and atherosclerosis were measured. The selective absence of iNKT cells in Jα18−/−LDLR−/− mice led to an increase in plasma cholesterol levels in female mice. Transgenic Vα14tg/LDLR−/− mice with elevated numbers of iNKT cells had increased late atherosclerosis of the innominate artery, though absence of either iNKT cells or all NKT cells and other CD1d expressing cells had varying effects on atherosclerotic lesion burden in the ascending aortic arch and aortic root. These studies not only highlight the potential modulatory role played by NKT cells in atherosclerosis and lipid metabolism, but also raise the possibility that divergent roles may be played by iNKT and CD1d restricted cells such as type II NKT cells or other CD1d expressing cells.
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Affiliation(s)
- Paul A VanderLaan
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA.
| | | | | | - Chyung-Ru Wang
- Department of Microbiology and Immunology, Northwestern University, 633 Clark St, Evanston, IL 60208, USA.
| | - Godfrey S Getz
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA.
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Affiliation(s)
- Godfrey S Getz
- From the Department of Pathology (G.S.G.), The University of Chicago, IL
| | - Catherine A Reardon
- Ben May Institute for Cancer Research (C.A.R.), The University of Chicago, IL
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10
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Abstract
Macrophages are core cellular elements of both early and advanced atherosclerosis. They take up modified lipoproteins and become lipid-loaded foam cells and secrete factors that influence other cell types in the artery wall involved in atherogenesis. Apoproteins E, AI, and SAA are all found on HDL which can enter the artery wall. In addition, apoE is synthesized by macrophages. These three apoproteins can promote cholesterol efflux from lipid-loaded macrophages and have other functions that modulate macrophage biology. Mimetic peptides based on the sequence or structure of these apoproteins replicate some of these properties and are potential therapeutic agents for the treatment of atherosclerosis to reduce cardiovascular diseases.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, The University of Chicago, Chicago, IL, United States
| | - Catherine A Reardon
- Ben May Department for Cancer Research, The University of Chicago, Chicago, IL, United States
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11
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Abstract
Apoprotein E (apoE) is a multifunctional protein. Its best-characterized function is as a ligand for low-density lipoprotein (LDL) receptor family members to mediate the clearance of apoB-containing atherogenic lipoproteins. Among its other functions, apoE is involved in cholesterol efflux, especially from cholesterol-loaded macrophage foam cells and other atherosclerosis-relevant cells, and in reverse cholesterol transport. Reverse cholesterol transport is a mechanism by which excess cellular cholesterol is transported via lipoproteins in the plasma to the liver where it can be excreted from the body in the feces. This process is thought to have a role in the attenuation of atherosclerosis. This review summarizes studies on the role of apoE in cellular cholesterol efflux and reverse cholesterol transport and discusses the identification of apoE mimetic peptides that may promote these pathways.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA.
| | - Catherine A Reardon
- Ben May Institute for Cancer Research, University of Chicago, Chicago, IL 60637, USA.
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12
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Abstract
Atherosclerosis is the underlying basis for most cardiovascular diseases. It is a chronic inflammation affecting the arterial intima and is promoted by hypercholesterolemia. Cells of both the innate and adaptive immune systems contribute to this inflammation with macrophages and T cells being the most abundant immune cells in the atherosclerotic plaques. In this review, we discuss the studies that examined the role of T cells and T cell subsets in Apoe-/- and Ldlr-/- murine models of atherosclerosis. While there is a general consensus that Th1 cells are pro-atherogenic and regulatory T cells are atheroprotective, the role of other subsets is more ambiguous. In addition, the results in the two models of atherosclerosis do not always yield similar results. Additional studies in the two murine models using cell specific gene manipulations are needed.
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Affiliation(s)
- Godfrey S. Getz
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA
| | - Catherine A. Reardon
- Ben May Institute for Cancer Research, The University of Chicago, Chicago, IL 60637, USA
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13
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Edelstein C, Getz GS, Marcovina SM, Albers JJ, Koschinsky M. Angelo Scanu Memorial. Arterioscler Thromb Vasc Biol 2018. [DOI: 10.1161/atvbaha.118.311203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
| | | | - Santica M. Marcovina
- Northwest Lipid Metabolism Research Laboratories, University of Washington, Seattle (S.M.M., J.J.A.)
| | - John J. Albers
- Northwest Lipid Metabolism Research Laboratories, University of Washington, Seattle (S.M.M., J.J.A.)
| | - Marlys Koschinsky
- Robarts Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Canada (M.K.)
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14
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL
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15
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Fancher IS, Ahn SJ, Adamos C, Osborn C, Oh MJ, Fang Y, Reardon CA, Getz GS, Phillips SA, Levitan I. Hypercholesterolemia-Induced Loss of Flow-Induced Vasodilation and Lesion Formation in Apolipoprotein E-Deficient Mice Critically Depend on Inwardly Rectifying K + Channels. J Am Heart Assoc 2018; 7:e007430. [PMID: 29502106 PMCID: PMC5866319 DOI: 10.1161/jaha.117.007430] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 01/17/2018] [Indexed: 01/14/2023]
Abstract
BACKGROUND Hypercholesterolemia-induced decreased availability of nitric oxide (NO) is a major factor in cardiovascular disease. We previously established that cholesterol suppresses endothelial inwardly rectifying K+ (Kir) channels and that Kir2.1 is an upstream mediator of flow-induced NO production. Therefore, we tested the hypothesis that suppression of Kir2.1 is responsible for hypercholesterolemia-induced inhibition of flow-induced NO production and flow-induced vasodilation (FIV). We also tested the role of Kir2.1 in the development of atherosclerotic lesions. METHODS AND RESULTS Kir2.1 currents are significantly suppressed in microvascular endothelial cells exposed to acetylated-low-density lipoprotein or isolated from apolipoprotein E-deficient (Apoe-/- ) mice and rescued by cholesterol depletion. Genetic deficiency of Kir2.1 on the background of hypercholesterolemic Apoe-/- mice, Kir2.1+/-/Apoe-/- exhibit the same blunted FIV and flow-induced NO response as Apoe-/- or Kir2.1+/- alone, but while FIV in Apoe-/- mice can be rescued by cholesterol depletion, in Kir2.1+/-/Apoe-/- mice cholesterol depletion has no effect on FIV. Endothelial-specific overexpression of Kir2.1 in arteries from Apoe-/- and Kir2.1+/-/Apoe-/- mice results in full rescue of FIV and NO production in Apoe-/- mice with and without the addition of a high-fat diet. Conversely, endothelial-specific expression of dominant-negative Kir2.1 results in the opposite effect. Kir2.1+/-/Apoe-/- mice also show increased lesion formation, particularly in the atheroresistant area of descending aorta. CONCLUSIONS We conclude that hypercholesterolemia-induced reduction in FIV is largely attributable to cholesterol suppression of Kir2.1 function via the loss of flow-induced NO production, whereas the stages downstream of flow-induced Kir2.1 activation appear to be mostly intact. Kir2.1 channels also have an atheroprotective role.
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MESH Headings
- Animals
- Aorta/metabolism
- Aorta/pathology
- Aortic Diseases/genetics
- Aortic Diseases/metabolism
- Aortic Diseases/pathology
- Aortic Diseases/physiopathology
- Atherosclerosis/genetics
- Atherosclerosis/metabolism
- Atherosclerosis/pathology
- Atherosclerosis/physiopathology
- Cells, Cultured
- Cholesterol/blood
- Disease Models, Animal
- Endothelial Cells/metabolism
- Endothelial Cells/pathology
- Endothelium, Vascular/metabolism
- Endothelium, Vascular/physiopathology
- Hypercholesterolemia/genetics
- Hypercholesterolemia/metabolism
- Hypercholesterolemia/pathology
- Hypercholesterolemia/physiopathology
- Male
- Mesenteric Arteries/metabolism
- Mesenteric Arteries/physiopathology
- Mice, Inbred C57BL
- Mice, Knockout, ApoE
- Nitric Oxide/metabolism
- Plaque, Atherosclerotic
- Potassium Channels, Inwardly Rectifying/deficiency
- Potassium Channels, Inwardly Rectifying/genetics
- Potassium Channels, Inwardly Rectifying/metabolism
- Signal Transduction
- Vasodilation
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Affiliation(s)
- Ibra S Fancher
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine, University of Illinois at Chicago, IL
- Department of Physical Therapy, University of Illinois at Chicago, IL
| | - Sang Joon Ahn
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine, University of Illinois at Chicago, IL
| | - Crystal Adamos
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine, University of Illinois at Chicago, IL
- Department of Physical Therapy, University of Illinois at Chicago, IL
| | - Catherine Osborn
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine, University of Illinois at Chicago, IL
| | - Myung-Jin Oh
- Section of Pulmonary and Critical Care, Department of Medicine, University of Chicago, IL
| | - Yun Fang
- Section of Pulmonary and Critical Care, Department of Medicine, University of Chicago, IL
| | | | | | - Shane A Phillips
- Department of Physical Therapy, University of Illinois at Chicago, IL
| | - Irena Levitan
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine, University of Illinois at Chicago, IL
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Subramanian S, Goodspeed L, Wang S, Ding Y, O'Brien KD, Getz GS, Chait A, Reardon CA. Deficiency of Invariant Natural Killer T Cells Does Not Protect Against Obesity but Exacerbates Atherosclerosis in Ldlr -/- Mice. Int J Mol Sci 2018; 19:ijms19020510. [PMID: 29419749 PMCID: PMC5855732 DOI: 10.3390/ijms19020510] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 01/27/2018] [Accepted: 01/29/2018] [Indexed: 12/30/2022] Open
Abstract
Obesity is a chronic inflammatory state characterized by altered levels of adipose tissue immune cell populations. Natural killer T (NKT) cells are CD1d restricted lymphocyte subsets that recognize lipid antigens whose level decreases in obese adipose tissue. However, studies in mice with deficiency or increased levels of NKT cells have yielded contradictory results, so the exact role of these cells in obesity and adipose tissue inflammation is not yet established. We previously showed that Ldlr−/− mice with excess invariant NKT (iNKT) cells demonstrate significant weight gain, adiposity, metabolic abnormalities, and atherosclerosis. The current study evaluates the effects of NKT cell deficiency on obesity, associated metabolic changes, and atherosclerosis in Jα18−/−Ldlr−/− (lacking iNKT cells) and Cd1d−/−Ldlr−/− (lacking invariant and type II NKT cells) mice, and control mice were fed an obesogenic diet (high fat, sucrose, cholesterol) for 16 weeks. Contrary to expectations, Ja18−/−Ldlr−/− mice gained significantly more weight than Ldlr−/− or Cd1d−/−Ldlr−/− mice, developed hypertriglyceridemia, and had worsened adipose tissue inflammation. All the mice developed insulin resistance and hepatic triglyceride accumulation. Ja18−/−Ldlr−/− mice also had increased atherosclerotic lesion area. Our findings suggest that iNKT cells exacerbates the metabolic, inflammatory, and atherosclerotic features of diet-induced obesity. Further work is required to unravel the paradox of an apparently similar effect of iNKT cell surplus and depletion on obesity.
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Affiliation(s)
- Savitha Subramanian
- Diabetes Obesity Center for Excellence, Division of Metabolism, Endocrinology and Nutrition, University of Washington, 850 Republican Street Box 35805, Seattle, WA 98109, USA.
| | - Leela Goodspeed
- Diabetes Obesity Center for Excellence, Division of Metabolism, Endocrinology and Nutrition, University of Washington, 850 Republican Street Box 35805, Seattle, WA 98109, USA.
| | - Shari Wang
- Diabetes Obesity Center for Excellence, Division of Metabolism, Endocrinology and Nutrition, University of Washington, 850 Republican Street Box 35805, Seattle, WA 98109, USA.
| | - Yilei Ding
- Diabetes Obesity Center for Excellence, Division of Metabolism, Endocrinology and Nutrition, University of Washington, 850 Republican Street Box 35805, Seattle, WA 98109, USA.
| | - Kevin D O'Brien
- Division of Cardiology, University of Washington, Seattle, WA 98195, USA.
| | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA.
| | - Alan Chait
- Diabetes Obesity Center for Excellence, Division of Metabolism, Endocrinology and Nutrition, University of Washington, 850 Republican Street Box 35805, Seattle, WA 98109, USA.
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Abstract
PURPOSE OF REVIEW Previous epidemiological studies and studies in experimental animals have provided strong evidence for the atheroprotective effect of HDL and its major apoprotein, apolipoprotein A-I (apoA-I). Identification of genetic loci associating apoA-I/HDL with cardiovascular disease is needed to establish a causal relationship. RECENT FINDINGS Pharmacological interventions to increase apoA-I or HDL cholesterol levels in humans are not associated with reduction in atherosclerosis. Genome wide association study (GWAS) studies in humans and hybrid mouse diversity panel (HMDP) studies looking for genetic variants associated with apoA-I or HDL cholesterol levels with cardiovascular disease and atherosclerosis have not provided strong evidence for their atheroprotective function. SUMMARY These findings indicate that GWAS and HMDP studies identifying possible genetic determinants of HDL and apoA-I function are needed.
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Pamir N, Hutchins PM, Ronsein GE, Wei H, Tang C, Das R, Vaisar T, Plow E, Schuster V, Koschinsky ML, Reardon CA, Weinberg R, Dichek DA, Marcovina S, Getz GS, Heinecke JW. Plasminogen promotes cholesterol efflux by the ABCA1 pathway. JCI Insight 2017; 2:92176. [PMID: 28768900 DOI: 10.1172/jci.insight.92176] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 06/20/2017] [Indexed: 12/20/2022] Open
Abstract
Using genetic and biochemical approaches, we investigated proteins that regulate macrophage cholesterol efflux capacity (CEC) and ABCA1-specific CEC (ABCA1 CEC), 2 functional assays that predict cardiovascular disease (CVD). Macrophage CEC and the concentration of HDL particles were markedly reduced in mice deficient in apolipoprotein A-I (APOA1) or apolipoprotein E (APOE) but not apolipoprotein A-IV (APOA4). ABCA1 CEC was markedly reduced in APOA1-deficient mice but was barely affected in mice deficient in APOE or APOA4. High-resolution size-exclusion chromatography of plasma produced 2 major peaks of ABCA1 CEC activity. The early-eluting peak, which coeluted with HDL, was markedly reduced in APOA1- or APOE-deficient mice. The late-eluting peak was modestly reduced in APOA1-deficient mice but little affected in APOE- or APOA4-deficient mice. Ion-exchange chromatography and shotgun proteomics suggested that plasminogen (PLG) accounted for a substantial fraction of the ABCA1 CEC activity in the peak not associated with HDL. Human PLG promoted cholesterol efflux by the ABCA1 pathway, and PLG-dependent efflux was inhibited by lipoprotein(a) [Lp(a)]. Our observations identify APOA1, APOE, and PLG as key determinants of CEC. Because PLG and Lp(a) associate with human CVD risk, interplay among the proteins might affect atherosclerosis by regulating cholesterol efflux from macrophages.
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Affiliation(s)
- Nathalie Pamir
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Patrick M Hutchins
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | | | - Hao Wei
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Chongren Tang
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Riku Das
- Department of Molecular Cardiology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Tomas Vaisar
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Edward Plow
- Department of Molecular Cardiology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Volker Schuster
- Hospital for Children and Adolescents, Medical Faculty of Leipzig University, Leipzig, Germany
| | - Marlys L Koschinsky
- Robarts Research Institute, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
| | | | - Richard Weinberg
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - David A Dichek
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Santica Marcovina
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, Illinois, USA
| | - Jay W Heinecke
- Department of Medicine, University of Washington, Seattle, Washington, USA
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19
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Abstract
PURPOSE OF REVIEW Atherosclerosis is a chronic inflammation associated with increased expression of the acute phase isoforms of serum amyloid A (SAA) and in humans is a plasma biomarker for future cardiovascular events. However, whether SAA is only a biomarker or participates in the development of cardiovascular disease is not well characterized. The purpose of this review is to summarize putative functions of SAA relevant to atherogenesis and in-vivo murine studies that directly examine the effect of SAA on atherosclerosis. RECENT FINDINGS Modulation of the expression of SAA1 and/or SAA2 in murine models of atherosclerosis suggests that SAA promotes early atherogenesis. SAA secreted from bone-marrow-derived cells contributes to this antiatherogenic phenotype. SAA also promotes angiotensin-induced abdominal aneurysm in atherogenic mouse models. The reduction in atherosclerosis may be due, at least in part, to remodeling of the acute phase HDL to reduce its capacity to promote cholesterol efflux and reduce its anti-inflammatory ability. SUMMARY SAA is more than a marker of cardiovascular disease and is a participant in the early atherogenic process.
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Affiliation(s)
- Godfrey S Getz
- aDepartment of Pathology bDepartment of Medicine cBen May Institute for Cancer Biology, University of Chicago, Chicago, Illinois, USA
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20
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Krishack PA, Sontag TJ, Getz GS, Reardon CA. Serum amyloid A regulates monopoiesis in hyperlipidemic Ldlr(-/-) mice. FEBS Lett 2016; 590:2650-60. [PMID: 27339627 DOI: 10.1002/1873-3468.12269] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/30/2016] [Accepted: 06/18/2016] [Indexed: 12/15/2022]
Abstract
We previously showed that feeding a Western-type diet (WTD) to Ldlr(-/-) mice lacking serum amyloid A (SAA) (Saa(-/-) Ldlr(-/-) mice), the level of total blood monocytes was higher than in Ldlr(-/-) mice. In this investigation we demonstrate that higher levels of bone marrow monocytes and macrophage-dendritic cell progenitor (MDP) cells were found in WTD-fed Saa(-/-) Ldlr(-/-) mice compared to Ldlr(-/-) mice and lower levels of GMP cells and CMP cells in Ldlr(-/-) mice. These data indicate that SAA regulates the level of bone marrow monocytes and their myeloid progenitors in hyperlipidemic Ldlr(-/-) mice.
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Affiliation(s)
- Paulette A Krishack
- Molecular Pathogenesis and Molecular Medicine Graduate Program, University of Chicago, IL, USA
| | | | - Godfrey S Getz
- Molecular Pathogenesis and Molecular Medicine Graduate Program, University of Chicago, IL, USA.,Department of Pathology, University of Chicago, IL, USA
| | - Catherine A Reardon
- Molecular Pathogenesis and Molecular Medicine Graduate Program, University of Chicago, IL, USA.,Department of Pathology, University of Chicago, IL, USA
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21
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Getz GS, Reardon CA. Do the Apoe-/- and Ldlr-/- Mice Yield the Same Insight on Atherogenesis? Arterioscler Thromb Vasc Biol 2016; 36:1734-41. [PMID: 27386935 DOI: 10.1161/atvbaha.116.306874] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/24/2016] [Indexed: 02/02/2023]
Abstract
Murine models of atherosclerosis are useful for investigating the environmental and genetic influences on lesion formation and composition. Apoe(-/-) and Ldlr(-/-) mice are the 2 most extensively used models. The models differ in important ways with respect to the precise mechanism by which their absence enhances atherosclerosis, including differences in plasma lipoproteins. The majority of the gene function studies have utilized only 1 model, with the results being generalized to atherogenic mechanisms. In only a relatively few cases have studies been conducted in both atherogenic murine models. This review will discuss important differences between the 2 atherogenic models and will point out studies that have been performed in the 2 models where results are comparable and those where different results were obtained.
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Affiliation(s)
- Godfrey S Getz
- From the Department of Pathology (G.S.G.) and Ben May Institute for Cancer Biology (C.A.R.), University of Chicago, IL.
| | - Catherine A Reardon
- From the Department of Pathology (G.S.G.) and Ben May Institute for Cancer Biology (C.A.R.), University of Chicago, IL
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22
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Pan Y, Ke H, Yan Z, Geng Y, Asner N, Palani S, Munirathinam G, Dasari S, Nitiss KC, Bliss S, Patel P, Shen H, Reardon CA, Getz GS, Chen A, Zheng G. The western-type diet induces anti-HMGB1 autoimmunity in Apoe(-/-) mice. Atherosclerosis 2016; 251:31-38. [PMID: 27240253 DOI: 10.1016/j.atherosclerosis.2016.05.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 05/15/2016] [Accepted: 05/18/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND AND AIMS Anti-HMGB1 autoimmunity plays a role in systemic lupus erythematosus (SLE). Because SLE increases atherosclerosis, we asked whether the same autoimmunity might play a role in atherogenesis. METHODS We looked for the induction of HMGB1-specific B and T cell responses by a western-type diet (WTD) in the Apoe(-/-) mouse model of atherosclerosis. We also determined whether modifying the responses modulates atherosclerosis. RESULTS In the plasma of male Apoe(-/-) mice fed WTD, the level of anti-HMGB1 antibodies (Abs) was detected at ∼50 μg/ml, which was ∼6 times higher than that in either Apoe(-/-) mice fed a normal chow or Apoe(+/+) mice fed WTD (p ≤ 0.0005). The Abs were directed largely toward a novel, dominant epitope of HMGB1 named HMW4; accordingly, compared with chow-fed mice, WTD-fed Apoe(-/-) mice had more activated HMW4-reactive B and T cells (p = 0.005 and p = 0.01, respectively). Compared with mock-immunized mice, Apoe(-/-) mice immunized with HMW4 along with an immunogenic adjuvant showed proportional increases in anti-HMW4 IgG and IgM Abs, HMW4-reactive B-1 and B-2 cells, and HMW4-reactive Treg and Teff cells, which was associated with ∼30% increase in aortic arch lesions (p ≤ 0.01) by two methods. In contrast, Apoe(-/-) mice immunized with HMW4 using a tolerogenic adjuvant showed preferential increases in anti-HMW4 IgM (over IgG) Abs, HMW4-reactive B-1 (over B-2) cells, and HMW4-specific Treg (over Teff) cells, which was associated with ∼40% decrease in aortic arch lesions (p ≤ 0.03). CONCLUSIONS Anti-HMGB1 autoimmunity may potentially play a role in atherogenesis.
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Affiliation(s)
- Yue Pan
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Hanzhong Ke
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Zhaoqi Yan
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Yajun Geng
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Nathan Asner
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Sunil Palani
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Gnanasekar Munirathinam
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Subramanyam Dasari
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Karin C Nitiss
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Sarah Bliss
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Priyanka Patel
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Hongming Shen
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA
| | - Catherine A Reardon
- Department of Pathology (C.A.R., G.S.G.), University of Chicago, Chicago, IL 60637, USA
| | - Godfrey S Getz
- Department of Pathology (C.A.R., G.S.G.), University of Chicago, Chicago, IL 60637, USA
| | - Aoshuang Chen
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA.
| | - Guoxing Zheng
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107, USA.
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23
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Pamir N, Dichek DA, Getz GS, Marcovina S, Heinecke JW. Abstract 255: Plasminogen Promotes Cholesterol Efflux by the ABCA1. Arterioscler Thromb Vasc Biol 2016. [DOI: 10.1161/atvb.36.suppl_1.255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
The cholesterol efflux capacity (CEC) of serum HDL, measured using cultured macrophages predicts incident and prevalent CVD risk in humans. The ABCA1 pathway is a key regulator of macrophage cholesterol homeostasis in vivo.
Methods:
We used genetic and biochemical approaches in mice to identify important mediators of CEC.
Results:
On high-resolution size-exclusion chromatography of mouse plasma, macrophage CEC and HDL co-eluted as a single major peak, suggesting that HDL mediates cholesterol efflux. In contrast, size-exclusion chromatography revealed two major peaks of material that promoted ABCA1-specific CEC, one of which was distinct from HDL. HDL particle concentration was reduced by 75% in
Apoa1
-/-
mice; this resulted in a 50% decrease in macrophage CEC but, surprisingly, had no impact on ABCA1-specific CEC. Orthogonal chromatography-mass spectrometric analysis of the non-HDL-associated efflux inducing material isolated from wild-type and APOA1 deficient plasma showed that plasminogen strongly correlated with ABCA1-specific CEC. Moreover, isolated plasminogen promoted cholesterol efflux by the ABCA1 pathway, and the specific activity of ABCA1-specific CEC of non-HDL-associated material was reduced by 50% in plasminogen deficient plasma. Imaging of cells treated with fluorescently-labeled antibodies demonstrated that ABCA1 and plasminogen co-localized on the plasma membrane.
Conclusions:
HDL particle concentration is an important contributor to macrophage CEC. However, other pathways contribute to ABCA1-specific CEC; our studies identify plasminogen as one potential mediator. Plasminogen associates with CVD risk in human genetic studies, raising the possibility that it plays a role in atherosclerosis by modulating ABCA1-mediated sterol efflux from macrophages.
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24
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Chellan B, Reardon CA, Getz GS, Hofmann Bowman MA. Enzymatically Modified Low-Density Lipoprotein Promotes Foam Cell Formation in Smooth Muscle Cells via Macropinocytosis and Enhances Receptor-Mediated Uptake of Oxidized Low-Density Lipoprotein. Arterioscler Thromb Vasc Biol 2016; 36:1101-13. [PMID: 27079883 DOI: 10.1161/atvbaha.116.307306] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 03/31/2016] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Enzyme-modified nonoxidized low-density lipoprotein (ELDL) is present in human atherosclerotic lesions. Our objective is to understand the mechanisms of ELDL uptake and its effects on vascular smooth muscle cells (SMC). APPROACH AND RESULTS Transformation of murine aortic SMCs into foam cells in response to ELDL was analyzed. ELDL, but not acetylated or oxidized LDL, was potent in inducing SMC foam cell formation. Inhibitors of macropinocytosis (LY294002, wortmannin, amiloride) attenuated ELDL uptake. In contrast, inhibitors of receptor-mediated endocytosis (dynasore, sucrose) and inhibitor of caveolae-/lipid raft-mediated endocytosis (filipin) had no effect on ELDL uptake in SMC, suggesting that macropinocytosis is the main mechanism of ELDL uptake by SMC. Receptor for advanced glycation end products (RAGE) is not obligatory for ELDL-induced SMC foam cell formation, but primes SMC for the uptake of oxidized LDL in a RAGE-dependent manner. ELDL increased intracellular reactive oxygen species, cytosolic calcium, and expression of lectin-like oxidized LDL receptor-1 in wild-type SMC but not in RAGE(-/-) SMC. The macropinocytotic uptake of ELDL is regulated predominantly by intracellular calcium because ELDL uptake was completely inhibited by pretreatment with the calcium channel inhibitor lacidipine in wild-type and RAGE(-/-) SMC. This is in contrast to pretreatment with PI3 kinase inhibitors which completely prevented ELDL uptake in RAGE(-/-) SMC, but only partially in wild-type SMC. CONCLUSIONS ELDL is highly potent in inducing foam cells in murine SMC. ELDL endocytosis is mediated by calcium-dependent macropinocytosis. Priming SMC with ELDL enhances the uptake of oxidized LDL.
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Affiliation(s)
- Bijoy Chellan
- From the Department of Medicine (B.C., M.A.H.B.), and Department of Pathology (C.A.R., G.S.G), University of Chicago, IL.
| | - Catherine A Reardon
- From the Department of Medicine (B.C., M.A.H.B.), and Department of Pathology (C.A.R., G.S.G), University of Chicago, IL
| | - Godfrey S Getz
- From the Department of Medicine (B.C., M.A.H.B.), and Department of Pathology (C.A.R., G.S.G), University of Chicago, IL
| | - Marion A Hofmann Bowman
- From the Department of Medicine (B.C., M.A.H.B.), and Department of Pathology (C.A.R., G.S.G), University of Chicago, IL.
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25
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Getz GS, Reardon CA. ApoE knockout and knockin mice: the history of their contribution to the understanding of atherogenesis. J Lipid Res 2016; 57:758-66. [PMID: 27015743 DOI: 10.1194/jlr.r067249] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Indexed: 12/16/2022] Open
Abstract
ApoE is a multifunctional protein that is expressed by many cell types that influences many aspects of cardiovascular physiology. In humans, there are three major allelic variants that differentially influence lipoprotein metabolism and risk for the development of atherosclerosis. Apoe-deficient mice and human apoE isoform knockin mice, as well as hypomorphic Apoe mice, have significantly contributed to our understanding of the role of apoE in lipoprotein metabolism, monocyte/macrophage biology, and atherosclerosis. This brief history of these mouse models will highlight their contribution to the understanding of the role of apoE in these processes. These Apoe(-/-) mice have also been extensively utilized as an atherosensitive platform upon which to assess the impact of modulator genes on the development and regression of atherosclerosis.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology University of Chicago, Chicago, IL
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26
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Pamir N, Hutchins P, Ronsein G, Vaisar T, Reardon CA, Getz GS, Lusis AJ, Heinecke JW. Proteomic analysis of HDL from inbred mouse strains implicates APOE associated with HDL in reduced cholesterol efflux capacity via the ABCA1 pathway. J Lipid Res 2015; 57:246-57. [PMID: 26673204 PMCID: PMC4727420 DOI: 10.1194/jlr.m063701] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Indexed: 12/15/2022] Open
Abstract
Cholesterol efflux capacity associates strongly and negatively with the incidence and prevalence of human CVD. We investigated the relationships of HDL’s size and protein cargo with its cholesterol efflux capacity using APOB-depleted serum and HDLs isolated from five inbred mouse strains with different susceptibilities to atherosclerosis. Like humans, mouse HDL carried >70 proteins linked to lipid metabolism, the acute-phase response, proteinase inhibition, and the immune system. HDL’s content of specific proteins strongly correlated with its size and cholesterol efflux capacity, suggesting that its protein cargo regulates its function. Cholesterol efflux capacity with macrophages strongly and positively correlated with retinol binding protein 4 (RBP4) and PLTP, but not APOA1. In contrast, ABCA1-specific cholesterol efflux correlated strongly with HDL’s content of APOA1, APOC3, and APOD, but not RBP4 and PLTP. Unexpectedly, APOE had a strong negative correlation with ABCA1-specific cholesterol efflux capacity. Moreover, the ABCA1-specific cholesterol efflux capacity of HDL isolated from APOE-deficient mice was significantly greater than that of HDL from wild-type mice. Our observations demonstrate that the HDL-associated APOE regulates HDL’s ABCA1-specific cholesterol efflux capacity. These findings may be clinically relevant because HDL’s APOE content associates with CVD risk and ABCA1 deficiency promotes unregulated cholesterol accumulation in human macrophages.
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Affiliation(s)
- Nathalie Pamir
- Department of Medicine, University of Washington, Seattle, WA
| | | | | | - Tomas Vaisar
- Department of Medicine, University of Washington, Seattle, WA
| | | | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL
| | - Aldons J Lusis
- Department of Genetics, University of California at Los Angeles, Los Angeles, CA
| | - Jay W Heinecke
- Department of Medicine, University of Washington, Seattle, WA
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27
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Abstract
PURPOSE OF REVIEW Macrophage foam cells are important cells in the vascular wall that contribute to the inflammation associated with atherosclerotic lesions. Recent studies have demonstrated the heterogeneity of macrophages in lesions. In this review, advances in our understanding of the formation of foam cells by macrophage subsets in atherosclerotic plaques will be discussed. RECENT FINDINGS Macrophage subsets develop in response to the microenvironment in the arterial wall. The uptake of lipoproteins, particularly oxidized LDL, has been considered the major mechanism of foam cell formation. However, native and aggregated LDL can also be taken up by macrophages and M2 macrophages have been shown to be efficient in the uptake of apoptotic cells that can contribute lipids to the cells. The ability of the macrophage subsets to respond to bioactive lipids in the artery wall to either promote macrophage subset polarization and/or to promote foam cell formation is only beginning to be understood. SUMMARY Although we are beginning to appreciate the heterogeneity of macrophages present in atherosclerotic plaques, further work is required to fully understand the molecular basis for the differential ability of macrophage subsets to form foam cells and to respond to bioactive lipids.
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Affiliation(s)
- Godfrey S Getz
- The University of Chicago, Department of Pathology, Chicago, Illinois, USA
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28
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Abstract
BACKGROUND Atherosclerosis is a chronic inflammatory disorder, and several studies have demonstrated a positive association between plasma serum amyloid A (SAA) levels and cardiovascular disease risk. The aim of the study was to examine whether SAA has a role in atherogenesis, the underlying basis of most cardiovascular disease. METHODS AND RESULTS Mice globally deficient in acute-phase isoforms Saa1 and Saa2 (Saa(-/-)) were crossed to Ldlr(-/-) mice (Saa(-/-)Ldlr(-/-)). Saa(-/-)Ldlr(-/-) mice demonstrated a 31% reduction in lesional area in the ascending aorta but not in the aortic root or innominate artery after consuming a high-fat, high-cholesterol Western-type diet for 6 weeks. The lesions were predominantly macrophage foam cells. The phenotype was lost in more mature lesions in mice fed a Western-type diet for 12 weeks, suggesting that SAA is involved in early lesion development. The decreased atherosclerosis in the Saa(-/-)Ldlr(-/-) mice occurred despite increased levels of blood monocytes and was independent of plasma lipid levels. SAA is produced predominantly by hepatocytes and macrophages. To determine which source of SAA may have a dominant role in lesion development, bone marrow transplantation was performed. Ldlr(-/-) mice that received bone marrow from Saa(-/-)Ldlr(-/-) mice had slightly reduced ascending aorta atherosclerosis compared with Saa(-/-)Ldlr(-/-) mice receiving bone marrow from Ldlr(-/-) mice, indicating that the expression of SAA by macrophages may have an important influence on atherogenesis. CONCLUSIONS The results indicate that SAA produced by macrophages promotes early lesion formation in the ascending aorta.
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Affiliation(s)
- Paulette A Krishack
- Molecular Pathogenesis and Molecular Medicine Graduate Program, University of Chicago, IL (P.A.K., C.A.R.)
| | - Clarissa V Bhanvadia
- Department of Pathology, University of Chicago, IL (C.V.B., J.L., T.J.S., G.S.G., C.A.R.)
| | - John Lukens
- Department of Pathology, University of Chicago, IL (C.V.B., J.L., T.J.S., G.S.G., C.A.R.)
| | - Timothy J Sontag
- Department of Pathology, University of Chicago, IL (C.V.B., J.L., T.J.S., G.S.G., C.A.R.)
| | - Maria C De Beer
- Graduate Center for Nutritional Science, Saha Cardiovascular Research Center, Lexington, KY (M.C.D.B.) Department of Physiology, University of Kentucky Medical Center, Lexington, KY (M.C.D.B.)
| | - Godfrey S Getz
- Department of Pathology, University of Chicago, IL (C.V.B., J.L., T.J.S., G.S.G., C.A.R.)
| | - Catherine A Reardon
- Molecular Pathogenesis and Molecular Medicine Graduate Program, University of Chicago, IL (P.A.K., C.A.R.) Department of Pathology, University of Chicago, IL (C.V.B., J.L., T.J.S., G.S.G., C.A.R.)
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29
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Abstract
Cardiovascular disease is the major cause of death in most developed nations and the social and economic burden of this disease is quite high. Atherosclerosis is a major underlying basis for most cardiovascular diseases including myocardial infarction and stroke. Genetically modified mouse models, particularly mice deficient in apoprotein E or the LDL receptor, have been widely used in preclinical atherosclerosis studies to gain insight into the mechanisms underlying this pathology. This chapter reviews several mouse models of atherosclerosis progression and regression as well as the role of immune cells in disease progression and the genetics of murine atherogenesis.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, Box MC 1089, 5841 S. Maryland Avenue, Chicago, IL, 60637, USA.
| | - Catherine A Reardon
- Department of Pathology, University of Chicago, Box MC 1089, 5841 S. Maryland Avenue, Chicago, IL, 60637, USA
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30
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Kuo CH, Leon L, Chung EJ, Huang RT, Sontag TJ, Reardon CA, Getz GS, Tirrell M, Fang Y. Inhibition of atherosclerosis-promoting microRNAs via targeted polyelectrolyte complex micelles. J Mater Chem B 2014; 2:8142-8153. [PMID: 25685357 PMCID: PMC4322949 DOI: 10.1039/c4tb00977k] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Polyelectrolyte complex micelles have great potential as gene delivery vehicles because of their ability to encapsulate charged nucleic acids forming a core by neutralizing their charge, while simultaneously protecting the nucleic acids from non-specific interactions and enzymatic degradation. Furthermore, to enhance specificity and transfection efficiency, polyelectrolyte complex micelles can be modified to include targeting capabilities. Here, we describe the design of targeted polyelectrolyte complex micelles containing inhibitors against dys-regulated microRNAs (miRNAs) that promote atherosclerosis, a leading cause of human mortality and morbidity. Inhibition of dys-regulated miRNAs in diseased cells associated with atherosclerosis has resulted in therapeutic efficacy in animal models and has been proposed to treat human diseases. However, the non-specific targeting of microRNA inhibitors via systemic delivery has remained an issue that may cause unwanted side effects. For this reason, we incorporated two different peptide sequences to our miRNA inhibitor containing polyelectrolyte complex micelles. One of the peptides (Arginine-Glutamic Acid-Lysine-Alanine or REKA) was used in another micellar system that demonstrated lesion-specific targeting in a mouse model of atherosclerosis. The other peptide (Valine-Histidine-Proline-Lysine-Glutamine-Histidine-Arginine or VHPKQHR) was identified via phage display and targets vascular endothelial cells through the vascular cell adhesion molecule-1 (VCAM-1). In this study we have tested the in vitro efficacy and efficiency of lesion- and cell-specific delivery of microRNA inhibitors to the cells associated with atherosclerotic lesions via peptide-targeted polyelectrolyte complex micelles. Our results show that REKA-containing micelles (fibrin-targeting) and VHPKQHR-containing micelles (VCAM-1 targeting) can be used to carry and deliver microRNA inhibitors into macrophages and human endothelial cells, respectively. Additionally, the functionality of miRNA inhibitors in cells was demonstrated by analyzing miRNA expression as well as the expression or the biological function of its downstream target protein. Our study provides the first demonstration of targeting dys-regulated miRNAs in atherosclerosis using targeted polyelectrolyte complex micelles and holds promising potential for translational applications.
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Affiliation(s)
- Cheng-Hsiang Kuo
- Department of Medicine, University of Chicago, Chicago, IL 60637, USA
| | - Lorraine Leon
- Institute for Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
- Argonne National Laboratory, Lemont, IL 60439
| | - Eun Ji Chung
- Institute for Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
| | - Ru-Ting Huang
- Department of Medicine, University of Chicago, Chicago, IL 60637, USA
| | - Timothy J. Sontag
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA
| | | | - Godfrey S. Getz
- Department of Pathology, University of Chicago, Chicago, IL 60637, USA
| | - Matthew Tirrell
- Institute for Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
- Argonne National Laboratory, Lemont, IL 60439
| | - Yun Fang
- Department of Medicine, University of Chicago, Chicago, IL 60637, USA
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31
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Abstract
Atherosclerosis is a chronic inflammation in the arterial wall involving cells of the innate and adaptive immune system that is promoted by hyperlipidemia. In addition, the immune system can influence lipids and lipoprotein levels and cellular lipid homeostasis can influence the level and function of the immune cells. We will review the effects of manipulation of adaptive immune cells and immune cell products on lipids and lipoproteins, focusing mainly on studies performed in murine models of atherosclerosis. We also review how lipoproteins and cellular lipid levels, particularly cholesterol levels, influence the function of cells of the innate and adaptive immune systems. The overriding theme is that these interactions are driven by the need to provide the energy and membrane components for cell proliferation and migration, membrane expansion and other functions that are so important in the functioning of the immune cells.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, Box MC 1089, 5841 S. Maryland Avenue, Chicago, IL 60637, USA
| | - Catherine A Reardon
- Department of Pathology, University of Chicago, Box MC 1089, 5841 S. Maryland Avenue, Chicago, IL 60637, USA
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Sontag TJ, Chellan B, Bhanvadia CV, Getz GS, Reardon CA. Alginic acid cell entrapment: a novel method for measuring in vivo macrophage cholesterol homeostasis. J Lipid Res 2014; 56:470-83. [PMID: 25465389 DOI: 10.1194/jlr.d052985] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Macrophage conversion to atherosclerotic foam cells is partly due to the balance of uptake and efflux of cholesterol. Cholesterol efflux from cells by HDL and its apoproteins for subsequent hepatic elimination is known as reverse cholesterol transport. Numerous methods have been developed to measure in vivo macrophage cholesterol efflux. Most methods do not allow for macrophage recovery for analysis of changes in cellular cholesterol status. We describe a novel method for measuring cellular cholesterol balance using the in vivo entrapment of macrophages in alginate, which retains incorporated cells while being permeable to lipoproteins. Recipient mice were injected subcutaneously with CaCl2 forming a bubble into which a macrophage/alginate suspension was injected, entrapping the macrophages. Cells were recovered after 24 h. Cellular free and esterified cholesterol mass were determined enzymatically and normalized to cellular protein. Both normal and cholesterol loaded macrophages undergo measureable changes in cell cholesterol when injected into WT and apoA-I-, LDL-receptor-, or apoE-deficient mice. Cellular cholesterol balance is dependent on initial cellular cholesterol status, macrophage cholesterol transporter expression, and apolipoprotein deficiency. Alginate entrapment allows for the in vivo measurement of macrophage cholesterol homeostasis and is a novel platform for investigating the role of genetics and therapeutic interventions in atherogenesis.
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Affiliation(s)
| | - Bijoy Chellan
- Department of Pathology, University of Chicago, Chicago, IL
| | | | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL
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Huang ZH, Reardon CA, Getz GS, Maeda N, Mazzone T. Selective suppression of adipose tissue apoE expression impacts systemic metabolic phenotype and adipose tissue inflammation. J Lipid Res 2014; 56:215-26. [PMID: 25421060 DOI: 10.1194/jlr.m050567] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
apoE is a multi-functional protein expressed in several cell types and in several organs. It is highly expressed in adipose tissue, where it is important for modulating adipocyte lipid flux and gene expression in isolated adipocytes. In order to investigate a potential systemic role for apoE that is produced in adipose tissue, mice were generated with selective suppression of adipose tissue apoE expression and normal circulating apoE levels. These mice had less adipose tissue with smaller adipocytes containing fewer lipids, but no change in adipocyte number compared with control mice. Adipocyte TG synthesis in the presence of apoE-containing VLDL was markedly impaired. Adipocyte caveolin and leptin gene expression were reduced, but adiponectin, PGC-1, and CPT-1 gene expression were increased. Mice with selective suppression of adipose tissue apoE had lower fasting lipid, insulin, and glucose levels, and glucose and insulin tolerance tests were consistent with increased insulin sensitivity. Lipid storage in muscle, heart, and liver was significantly reduced. Adipose tissue macrophage inflammatory activation was markedly diminished with suppression of adipose tissue apoE expression. Our results establish a novel effect of adipose tissue apoE expression, distinct from circulating apoE, on systemic substrate metabolism and adipose tissue inflammatory state.
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Affiliation(s)
- Zhi H Huang
- Department of Pathology, University of Chicago, Chicago, IL
| | | | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL
| | - Nobuyo Maeda
- Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Theodore Mazzone
- Department of Medicine, NorthShore University HealthSystem, Evanston, IL and University of Chicago, Chicago, IL
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Averill MM, Kim EJ, Goodspeed L, Wang S, Subramanian S, Den Hartigh LJ, Tang C, Ding Y, Reardon CA, Getz GS, Chait A. The apolipoprotein-AI mimetic peptide L4F at a modest dose does not attenuate weight gain, inflammation, or atherosclerosis in LDLR-null mice. PLoS One 2014; 9:e109252. [PMID: 25286043 PMCID: PMC4186861 DOI: 10.1371/journal.pone.0109252] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 09/08/2014] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE High density lipoprotein (HDL) cholesterol levels are inversely related to cardiovascular disease risk and associated with a reduced risk of type 2 diabetes. Apolipoprotein A-I (apoA-I; major HDL protein) mimetics have been reported to reduce atherosclerosis and decrease adiposity. This study investigated the effect of L4F mimetic peptide and apoA-I overexpression on weight gain, insulin resistance, and atherosclerosis in an LDL receptor deficient (Ldlr-/-) model fed a high fat high sucrose with cholesterol (HFHSC) diet. METHODS Studies in differentiated 3T3-L1 adipocytes tested whether L4F could inhibit palmitate-induced adipocyte inflammation. In vivo studies used male Ldlr-/- mice fed a HFHSC diet for 12 weeks and were injected daily with L4F (100 µg/mouse) subcutaneously during the last 8 weeks. Wild-type and apoA-I overexpressing Ldlr-/- mice were fed HFHSC diet for 16 weeks. RESULTS Neither L4F administration nor apoA-I overexpression affected weight gain, total plasma cholesterol or triglycerides in our studies. While pre-treatment of 3T3-L1 adipocytes with either L4F or HDL abolished palmitate-induced cytokine expression in vitro, L4F treatment did not affect circulating or adipose tissue inflammatory markers in vivo. Neither L4F administration nor apoA-I overexpression affected glucose tolerance. ApoA-I overexpression significantly reduced atherosclerotic lesion size, yet L4F treatment did not affect atherosclerosis. CONCLUSION Our results suggest that neither L4F (100 µg/day/mouse) nor apoA-I overexpression affects adiposity or insulin resistance in this model. We also were unable to confirm a reduction in atherosclerosis with L4F in our particular model. Further studies on the effect of apoA-I mimetics on atherosclerosis and insulin resistance in a variety of dietary contexts are warranted.
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Affiliation(s)
- Michelle M. Averill
- Department of Environmental and Occupational Health, University of Washington, Seattle, Washington, United States of America
| | - Eung Ju Kim
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Leela Goodspeed
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Shari Wang
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Savitha Subramanian
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Laura J. Den Hartigh
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Chongren Tang
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Yilei Ding
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Catherine A. Reardon
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
| | - Godfrey S. Getz
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
| | - Alan Chait
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
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Wool GD, Reardon CA, Getz GS. Mimetic peptides of human apoA-I helix 10 get together to lower lipids and ameliorate atherosclerosis: is the action in the gut? J Lipid Res 2014; 55:1983-5. [PMID: 25085258 DOI: 10.1194/jlr.e053538] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | | | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL
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Getz GS. PCSK9 in South African variants of familial hypercholesterolemia. J Am Coll Cardiol 2014; 63:2374-5. [PMID: 24632264 DOI: 10.1016/j.jacc.2014.01.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 01/13/2014] [Indexed: 10/25/2022]
Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, Illinois.
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Chen A, Geng Y, Ke H, Constant L, Yan Z, Pan Y, Lee P, Tan I, Williams K, George S, Munirathinam G, Reardon CA, Getz GS, Wang B, Zheng G. Cutting edge: Dexamethasone potentiates the responses of both regulatory T cells and B-1 cells to antigen immunization in the ApoE(-/-) mouse model of atherosclerosis. J Immunol 2014; 193:35-9. [PMID: 24899497 DOI: 10.4049/jimmunol.1302469] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The immunosuppressant dexamethasone was shown to preferentially deplete CD4+ effector T cells while sparing regulatory T cells (Tregs) in vivo. In the current study, we show that it also preferentially depletes B-2 cells while sparing B-1 cells. In the ApoE(-/-) mouse model of atherosclerosis, in which both Tregs and B-1 cells are thought to play an atheroprotective role, we show that HSP60-targeted immunization in the presence of dexamethasone raises Ag-reactive Tregs and B-1 cells concomitantly and reduces the severity of atherosclerosis. These results indicate that dexamethasone is an adjuvant that potentiates both the Treg and B-1 responses to immunogens. This study shows that B-1 cells with a specificity for a disease-relevant Ag can be raised in vivo by immunization.
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Affiliation(s)
- Aoshuang Chen
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107;
| | - Yajun Geng
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Hanzhong Ke
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Laura Constant
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Zhaoqi Yan
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Yue Pan
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Patricia Lee
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Isaiah Tan
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Kurt Williams
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Samantha George
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | - Gnanasekar Munirathinam
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107
| | | | - Godfrey S Getz
- Department of Pathology, University of Chicago, Chicago, IL 60637; and
| | - Bin Wang
- Key Laboratory of Medical Molecular Virology of Ministry of Health and Ministry of Education, Fudan University, Shanghai 200032, China
| | - Guoxing Zheng
- Department of Biomedical Sciences, University of Illinois College of Medicine at Rockford, Rockford, IL 61107;
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Abstract
PURPOSE OF REVIEW To review recent advances in our understanding of the mechanism of action of apoprotein A-I (apoA-I) mimetic peptides and improved methods for the oral delivery of peptides. RECENT FINDINGS The apoA-I mimetic peptides are based on the structure of the major apoprotein of HDL with the expectation that they may also mimic some of the antiatherogenic functions of HDL. Recent work has provided insight into mechanisms by which they may be antioxidative and anti-inflammatory. In addition, recent work has shifted the focus of the site of action of the mimetic peptides to the small intestine from the plasma and HDL and suggests modulation of bioactive oxidized lipids in the intestine by the peptides may be a major antiatherogenic pathway. The development of transgenic tomatoes expressing an apoA-I mimetic peptide is a significant advance in the oral delivery of peptides as therapies for cardiovascular disease and other chronic inflammatory disorders. SUMMARY In the past year, there have been important advances in the field of apoA-I mimetic peptides, including the oral delivery of bioactive peptides. Further work is required to fully understand the molecular basis for the effect of the peptide on the intestine and bioactive oxidized lipids.
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Affiliation(s)
- Godfrey S Getz
- The University of Chicago, Department of Pathology, Chicago, Illinois, USA
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Sontag TJ, Krishack PA, Lukens JR, Bhanvadia CV, Getz GS, Reardon CA. Apolipoprotein A-I protection against atherosclerosis is dependent on genetic background. Arterioscler Thromb Vasc Biol 2013; 34:262-9. [PMID: 24334873 DOI: 10.1161/atvbaha.113.302831] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
OBJECTIVE Inbred mouse strains have different susceptibilities to experimental atherosclerosis. The C57BL/6 strain is among the most sensitive and has, therefore, been the most widely used in atherosclerosis studies, whereas many strains are resistant. The FVB/N strain is highly resistant to atherosclerosis on the apolipoprotein E (apoE)- and low-density lipoprotein (LDL) receptor-deficient backgrounds. High-density lipoprotein and its major apoprotein, apoA-I, have been shown to be protective against atherogenesis on the C57BL/6 background. We here examine the influence of genetic background on the atheroprotective nature of apoA-I. APPROACH AND RESULTS ApoE-deficient/apoA-I-deficient mice were generated in the C57BL/6 and FVB/N strains from apoE-deficient mice. After 6 to 10 weeks on a Western-type diet, plasma lipids and atherosclerotic lesion size were assessed. Macrophage recruitment, cholesterol regulation, and blood monocyte levels were examined as potential mechanisms driving lesion size differences. FVB/N knockout mice had higher plasma very-LDL/LDL cholesterol than their C57BL/6 counterparts. ApoA-I deficiency decreased very-LDL/LDL cholesterol in C57BL/6 mice but not in FVB/N mice. FVB/N single and double knockout mice had less lesion than C57BL/6 6 to 10 weeks on diet. ApoA-I deficiency augmented lesion development only in C57BL/6 mice. Macrophage recruitment to thioglycollate-treated peritoneum and diet-induced blood monocyte levels reflected the pattern of lesion development among the 4 genotypes. ApoA-I deficiency increased macrophage cholesterol content only in C57BL/6. FVB/N plasma was a better acceptor for macrophage cholesterol efflux than C57BL/6. CONCLUSIONS ApoA-I is atheroprotective only in certain genetic contexts. In the C57BL/6 context, but not FVB/N, apoA-I decreases inflammatory macrophage recruitment and monocytosis, contributors to lesion formation.
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Subramanian S, Turner MS, Ding Y, Goodspeed L, Wang S, Buckner JH, O'Brien K, Getz GS, Reardon CA, Chait A. Increased levels of invariant natural killer T lymphocytes worsen metabolic abnormalities and atherosclerosis in obese mice. J Lipid Res 2013; 54:2831-41. [PMID: 23922382 DOI: 10.1194/jlr.m041020] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Obesity is a chronic inflammatory state characterized by infiltration of adipose tissue by immune cell populations, including T lymphocytes. Natural killer T (NKT) cells, a specialized lymphocyte subset recognizing lipid antigens, can be pro- or anti-inflammatory. Their role in adipose inflammation continues to be inconclusive and contradictory. In obesity, the infiltration of tissues by invariant NKT (iNKT) cells is decreased. We therefore hypothesized that an excess iNKT cell complement might improve metabolic abnormalities in obesity. Vα14 transgenic (Vα14tg) mice, with increased iNKT cell numbers, on a LDL receptor-deficient (Ldlr(-/-)) background and control Ldlr(-/-) mice were placed on an obesogenic diet for 16 weeks. Vα14tg.Ldlr(-/-) mice gained 25% more weight and had increased adiposity than littermate controls. Transgenic mice also developed greater dyslipidemia, hyperinsulinemia, insulin resistance, and hepatic triglyceride accumulation. Increased macrophage Mac2 immunostaining and proinflammatory macrophage gene expression suggested worsened adipose inflammation. Concurrently, these mice had increased atherosclerotic lesion area and aortic inflammation. Thus, increasing the complement of iNKT cells surprisingly exacerbated the metabolic, inflammatory, and atherosclerotic features of obesity. These findings suggest that the reduction of iNKT cells normally observed in obesity may represent a physiological attempt to compensate for this inflammatory condition.
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Affiliation(s)
- Savitha Subramanian
- Division of Metabolism, Endocrinology and Nutrition and University of Washington, Seattle, WA
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Tsimikas S, Miyanohara A, Hartvigsen K, Merki E, Shaw PX, Chou MY, Pattison J, Torzewski M, Sollors J, Friedmann T, Lai NC, Hammond HK, Getz GS, Reardon CA, Li AC, Banka CL, Witztum JL. Human oxidation-specific antibodies reduce foam cell formation and atherosclerosis progression. J Am Coll Cardiol 2013; 58:1715-27. [PMID: 21982317 DOI: 10.1016/j.jacc.2011.07.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Revised: 07/11/2011] [Accepted: 07/11/2011] [Indexed: 12/31/2022]
Abstract
OBJECTIVES We sought to assess the in vivo importance of scavenger receptor (SR)-mediated uptake of oxidized low-density lipoprotein (OxLDL) in atherogenesis and to test the efficacy of human antibody IK17-Fab or IK17 single-chain Fv fragment (IK17-scFv), which lacks immunologic properties of intact antibodies other than the ability to inhibit uptake of OxLDL by macrophages, to inhibit atherosclerosis. BACKGROUND The unregulated uptake of OxLDL by macrophage SR contributes to foam cell formation, but the importance of this pathway in vivo is uncertain. METHODS Cholesterol-fed low-density lipoprotein receptor knockout (LDLR(-/-)) mice were treated with intraperitoneal infusion of human IK17-Fab (2.5 mg/kg) 3 times per week for 14 weeks. Because anti-human antibodies developed in these mice, LDLR(-/-)/low-density lipoprotein receptor Rag 1 double-knockout mice (lacking the ability to make immunoglobulins due to loss of T- and B-cell function) were treated with an adenoviral vector encoding adenovirus expressed (Adv)-IK17-scFv or control adenovirus-enhanced green fluorescent protein vector intravenously every 2 weeks for 16 weeks. RESULTS In LDLR(-/-) mice, infusion of IK17-Fab was able to sustain IK17 plasma levels for the first 8 weeks, but these diminished afterward due to increasing murine anti-IK17 antibody titers. Despite this, after 14 weeks, a 29% decrease in en face atherosclerosis was noted compared with phosphate-buffered saline-treated mice. In LDLR(-/-)/low-density lipoprotein receptor Rag 1 double-knockout mice, sustained levels of plasma IK17-scFv was achieved by Adv-IK17-scFv-mediated hepatic expression, which led to a 46% reduction (p < 0.001) in en face atherosclerosis compared with adenovirus-enhanced green fluorescent protein vector. Importantly, peritoneal macrophages isolated from Adv-IK17-scFv treated mice had decreased lipid accumulation compared with adenovirus-enhanced green fluorescent protein-treated mice. CONCLUSIONS These data support an important role for SR-mediated uptake of OxLDL in the pathogenesis of atherosclerosis and demonstrate that oxidation-specific antibodies reduce the progression of atherosclerosis, suggesting their potential in treating cardiovascular disease in humans.
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Affiliation(s)
- Sotirios Tsimikas
- Department of Medicine, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0682, USA.
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Sontag TJ, Chellan B, Getz GS, Reardon CA. Differing rates of cholesterol absorption among inbred mouse strains yield differing levels of HDL-cholesterol. J Lipid Res 2013; 54:2515-24. [PMID: 23812556 DOI: 10.1194/jlr.m040055] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Inbred strains of mice with differing susceptibilities to atherosclerosis possess widely varying plasma HDL levels. Cholesterol absorption and lipoprotein formation were compared between atherosclerosis-susceptible, low-HDL C57BL6/J mice and atherosclerosis-resistant, high-HDL FVBN/J mice. [(3)H]cholesterol and triglyceride appeared in the plasma of FVB mice gavaged with cholesterol in olive oil at a much higher rate than in C57 mice. The plasma cholesterol was found almost entirely as HDL-cholesterol in both strains. Inhibition of lipoprotein catabolism with Tyloxapol revealed that the difference in the rate of [(3)H]cholesterol appearance in the plasma was due entirely to a greater rate of chylomicron secretion from the intestine of the FVB mice. Lipid absorption into the 2nd quarter of the small intestine is greater in the FVB mice and indicates that this region may contain the factors that give rise to the differences in absorption observed between the two mouse strains. Additionally, ad libitum feeding prior to cholesterol gavage accentuates the absorption rate differences compared with fasting. The resultant remodeling of the increased levels of chylomicron in the plasma may contribute to increased plasma HDL. Intestinal gene expression analysis reveals several genes that may play a role in these differences, including microsomal triglyceride transfer protein and ABCG8.
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Affiliation(s)
- Timothy J Sontag
- Department of Pathology, University of Chicago, Chicago, IL, USA.
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Sontag TJ, Krishack PA, Biswas TK, Getz GS, Reardon CA. Abstract 477: HDL Inhibition of Murine Atherosclerosis Lesion Development is Dependent on Strain Background. Arterioscler Thromb Vasc Biol 2013. [DOI: 10.1161/atvb.33.suppl_1.a477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Inbred mouse strains vary greatly in their relative atherosensitivity, with C57BL/6 (C57) being the most sensitive and hence the preferred strain for most atherosclerosis studies. Among the resistant strains, FVBN/J (FVB) has been relatively well studied. On the ApoE knockout (E°) background, both mouse strains develop atherosclerotic lesions which are exacerbated by feeding a high fat/high cholesterol western-type diet (WTD). However, the FVB-E° mouse exhibits nearly 10-fold smaller lesions than the C57-E°. Additionally, FVB mice have plasma HDL cholesterol levels that are twice as high as C57. Wild type FVB mice have been shown to have lower inflammatory cell recruitment to the peritoneum upon thioglycollate treatment than C57. Our lab has generated ApoE/ApoA-I double knockout mice (EA°, lacking HDL) on both C57 and FVB background to compare the effect of HDL deficiency on lesion development. We hypothesize that the loss of HDL will have a greater effect on the more lesion susceptible C57 than the resistant FVB.
8 week C57 and FVB E° and EA° mice were kept on a WTD for 6 or 10 weeks and lesions were quantified in the innominate artery, ascending aorta, and aortic root. In all cases mice in the C57 background displayed significantly greater lesion size than mice in the FVB background, except in the ascending aorta of the E° mice at the earlier time point, despite higher plasma cholesterol levels in the FVB mice. The presence of ApoA-I was protective (E° vs EA°) in the C57 strain in the ascending aorta at both time points and its protection became significant in the innominate artery at the 10 week time point. No additional protection was afforded by ApoA-I in the FVB strain. ApoA-I deficiency in FVB mice did not affect inflammatory cell recruitment to the peritoneal cavity or plasma markers of LDL oxidation as greatly as in C57 mice. Plasma monocyte counts both before and after 6 weeks on WTD were higher in C57 mice with no effect of ApoA-I in either strain.
In conclusion, the FVB strain is less sensitive than C57 to lesion development at 3 major arterial sites with no protection afforded by HDL/ApoA-I, whereas HDL/ApoA-I is significantly protective in the C57 strain. This protection may result from the anti-inflammatory/anti-oxidative nature of C57 HDL that is not observed in FVB mice.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA.
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Chellan B, Koroleva EP, Sontag TJ, Tumanov AV, Fu YX, Getz GS, Reardon CA. LIGHT/TNFSR14 can regulate hepatic lipase expression by hepatocytes independent of T cells and Kupffer cells. PLoS One 2013; 8:e54719. [PMID: 23355893 PMCID: PMC3552851 DOI: 10.1371/journal.pone.0054719] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 12/14/2012] [Indexed: 12/17/2022] Open
Abstract
LIGHT/TNFSF14 is a costimulatory molecule expressed on activated T cells for activation and maintenance of T cell homeostasis. LIGHT over expressed in T cells also down regulates hepatic lipase levels in mice through lymphotoxin beta receptor (LTβR) signaling. It is unclear whether LIGHT regulates hepatic lipase directly by interacting with LTβR expressing cells in the liver or indirectly by activation of T cells, and whether Kupffer cells, a major cell populations in the liver that expresses the LTβR, are required. Here we report that LIGHT expression via an adenoviral vector (Ad-LIGHT) is sufficient to down regulate hepatic lipase expression in mice. Depletion of Kupffer cells using clodronate liposomes had no effect on LIGHT-mediated down regulation of hepatic lipase. LIGHT-mediated regulation of hepatic lipase is also independent of LIGHT expression by T cells or activation of T cells. This is demonstrated by the decreased hepatic lipase expression in the liver of Ad-LIGHT infected recombination activating gene deficient mice that lack mature T cells and by the Ad-LIGHT infection of primary hepatocytes. Hepatic lipase expression was not responsive to LIGHT when mice lacking LTβR globally or only on hepatocytes were infected with Ad-LIGHT. Therefore, our data argues that interaction of LIGHT with LTβR on hepatocytes, but not Kupffer cells, is sufficient to down regulate hepatic lipase expression and that this effect can be independent of LIGHT’s costimulatory function.
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Affiliation(s)
- Bijoy Chellan
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
| | | | - Timothy J. Sontag
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
| | | | - Yang-Xin Fu
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
- * E-mail: (YXF); (CAR)
| | - Godfrey S. Getz
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
| | - Catherine A. Reardon
- Department of Pathology, University of Chicago, Chicago, Illinois, United States of America
- * E-mail: (YXF); (CAR)
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Zheng G, Zhong S, Geng Y, Munirathinam G, Cha I, Reardon C, Getz GS, van Rooijen N, Kang Y, Wang B, Chen A. Dexamethasone promotes tolerance in vivo by enriching CD11clo CD40lo tolerogenic macrophages. Eur J Immunol 2012; 43:219-27. [PMID: 23001956 DOI: 10.1002/eji.201242468] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 07/30/2012] [Accepted: 09/17/2012] [Indexed: 01/18/2023]
Abstract
We previously showed that antigen immunization in the presence of the immunosuppressant dexamethasone (a strategy we termed "suppressed immunization") could tolerize established recall responses of T cells. However, the mechanism by which dexamethasone acts as a tolerogenic adjuvant has remained unclear. In the present study, we show that dexamethasone enriches CD11c(lo) CD40(lo) macrophages in a dose-dependent manner in the spleen and peripheral lymph nodes of mice by depleting all other CD11c(+) CD40(+) cells including dendritic cells. The enriched macrophages display a distinct MHC class II (MHC II)(lo) CD86(hi) phenotype. Upon activation by antigen in vivo, CD11c(lo) CD40(lo) macrophages upregulate IL-10, a classic marker for tolerogenic antigen-presenting cells, and elicit a serum IL-10 response. When presenting antigen in vivo, these cells do not elicit recall responses from memory T cells, but rather stimulate the expansion of antigen-specific regulatory T cells. Moreover, the depletion of CD11c(lo) CD40(lo) macrophages during suppressed immunization diminishes the tolerogenic efficacy of the treatment. These results indicate that dexamethasone acts as a tolerogenic adjuvant partly by enriching the CD11c(lo) CD40(lo) tolerogenic macrophages.
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Affiliation(s)
- Guoxing Zheng
- Department of Biomedical Sciences, University of Illinois at Chicago, Chicago, Illinois 61107, USA.
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Huang ZH, Reardon CA, Subbaiah PV, Getz GS, Mazzone T. ApoE derived from adipose tissue does not suppress atherosclerosis or correct hyperlipidemia in apoE knockout mice. J Lipid Res 2012; 54:202-13. [PMID: 23071294 DOI: 10.1194/jlr.m031906] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The synthesis of apoE by adipocytes has profound effects on adipose tissue lipid flux and gene expression. Using adipose tissue transplantation from wild-type (WT) to apoE knockout (EKO) mice, we show that adipose tissue also contributes to circulating apoE. Different from circulating apoE produced by bone marrow transplantation (BMT), however, adipose tissue-derived apoE does not correct hyperlipidemia or suppress atherosclerosis. ApoE secreted by macrophages has a more acidic isoform distribution, and it increases binding of reconstituted VLDL particles to hepatocytes and fibroblasts more effectively than apoE secreted by adipocytes. The incremental binding can be entirely accounted for by binding to the LDL receptor. After BMT into EKO hosts, plasma cholesterol and macrophage-derived apoE are largely within IDL/LDL- and HDL-sized particles. After adipose tissue transplantation, most cholesterol and adipocyte apoE remain in VLDL. After BMT, circulating apoE no longer demonstrates predominance of acidic isoforms compared with that circulating after fat transplantation. In conclusion, fat transplantation provides circulating apoE levels similar to those provided by bone marrow transplantation, but it does not suppress hyperlipidemia or atherosclerosis. A potential mechanism contributing to this difference is differential binding to cell surface lipoprotein receptors.
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Affiliation(s)
- Zhi H Huang
- Department of Medicine, University of Chicago, Chicago, IL, USA
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Szeto FL, Reardon CA, Yoon D, Wang Y, Wong KE, Chen Y, Kong J, Liu SQ, Thadhani R, Getz GS, Li YC. Vitamin D receptor signaling inhibits atherosclerosis in mice. Mol Endocrinol 2012; 26:1091-101. [PMID: 22638071 DOI: 10.1210/me.2011-1329] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Although vitamin D has been implicated in cardiovascular protection, few studies have addressed the role of vitamin D receptor (VDR) in atherosclerosis. Here we investigate the effect of inactivation of the VDR signaling on atherogenesis and the antiatherosclerotic mechanism of vitamin D. Low density lipoprotein receptor (LDLR)(-/-)/VDR(-/-) mice exhibited site-specific accelerated atherogenesis, accompanied by increases in adhesion molecules and proinflammatory cytokines in the aorta and cholesterol influx in macrophages. Macrophages showed marked renin up-regulation in the absence of VDR, and inhibition of renin by aliskiren reduced atherosclerosis in LDLR(-/-)/VDR(-/-) mice, suggesting that the renin-angiotensin system (RAS) promotes atherosclerosis in the absence of VDR. LDLR(-/-) mice receiving LDLR(-/-)/VDR(-/-) BMT developed larger lesions than LDLR(-/-) BMT controls. Moreover, LDLR(-/-) mice receiving Rag-1(-/-)/VDR(-/-) BMT, which were unable to generate functional T and B lymphocytes, still had more severe atherosclerosis than Rag-1(-/-) BMT controls, suggesting a critical role of macrophage VDR signaling in atherosclerotic suppression. Aliskiren treatment eliminated the difference in lesions between Rag-1(-/-)/VDR(-/-) BMT and Rag-1(-/-) BMT recipients, indicating that local RAS activation in macrophages contributes to the enhanced atherogenesis seen in Rag-1(-/-)/VDR(-/-) BMT mice. Taken together, these observations provide evidence that macrophage VDR signaling, in part by suppressing the local RAS, inhibits atherosclerosis in mice.
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Affiliation(s)
- Frances L Szeto
- Department of Pathology, Division of Biological Sciences, The University of Chicago, Chicago, Illinois 60637, USA
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Getz GS. Sailing to Byzantium: Eugene P. Kennedy (1919-2011). FASEB J 2012; 26:1771-3. [PMID: 22547785 DOI: 10.1096/fj.12-0502ufm] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Godfrey S Getz
- Department of Pathology and Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA.
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