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Bonilha I, Luchiari B, Nadruz W, Sposito AC. Very low HDL levels: clinical assessment and management. ARCHIVES OF ENDOCRINOLOGY AND METABOLISM 2023; 67:3-18. [PMID: 36651718 PMCID: PMC9983789 DOI: 10.20945/2359-3997000000585] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In individuals with very low high-density lipoprotein (HDL-C) cholesterol, such as Tangier disease, LCAT deficiency, and familial hypoalphalipoproteinemia, there is an increased risk of premature atherosclerosis. However, analyzes based on comparisons of populations with small variations in HDL-C mediated by polygenic alterations do not confirm these findings, suggesting that there is an indirect association or heterogeneity in the pathophysiological mechanisms related to the reduction of HDL-C. Trials that evaluated some of the HDL functions demonstrate a more robust degree of association between the HDL system and atherosclerotic risk, but as they were not designed to modify lipoprotein functionality, there is insufficient data to establish a causal relationship. We currently have randomized clinical trials of therapies that increase HDL-C concentration by various mechanisms, and this HDL-C elevation has not independently demonstrated a reduction in the risk of cardiovascular events. Therefore, this evidence shows that (a) measuring HDL-C as a way of estimating HDL-related atheroprotective system function is insufficient and (b) we still do not know how to increase cardiovascular protection with therapies aimed at modifying HDL metabolism. This leads us to a greater effort to understand the mechanisms of molecular action and cellular interaction of HDL, completely abandoning the traditional view focused on the plasma concentration of HDL-C. In this review, we will detail this new understanding and the new horizon for using the HDL system to mitigate residual atherosclerotic risk.
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Affiliation(s)
- Isabella Bonilha
- Universidade de Campinas (Unicamp), Laboratório de Biologia Vascular e Aterosclerose (AtheroLab), Divisão de Cardiologia, Campinas, SP, Brasil
| | - Beatriz Luchiari
- Universidade de Campinas (Unicamp), Laboratório de Biologia Vascular e Aterosclerose (AtheroLab), Divisão de Cardiologia, Campinas, SP, Brasil
| | - Wilson Nadruz
- Universidade de Campinas (Unicamp), Divisão de Cardiologia, Campinas, SP, Brasil
| | - Andrei C Sposito
- Universidade de Campinas (Unicamp), Laboratório de Biologia Vascular e Aterosclerose (AtheroLab), Divisão de Cardiologia, Campinas, SP, Brasil,
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2
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White CR, Palgunachari M, Wolkowicz P, Anantharamaiah GM. Peptides as Therapeutic Agents for Atherosclerosis. Methods Mol Biol 2022; 2419:89-110. [PMID: 35237960 DOI: 10.1007/978-1-0716-1924-7_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
More than three decades ago, as a test for the amphipathic helix theory, an 18 amino acid residue peptide and its analogs were designed with no sequence homology to any of the exchangeable apolipoproteins. Based on the apolipoprotein A-I (the major protein component of high density lipoproteins, HDL) mimicking properties, they were termed as ApoA-I mimicking peptides. Several laboratories around the world started studying such de novo-designed peptides for their antiatherogenic properties. The present chapter describes the efforts in bringing these peptides as therapeutic agents for atherosclerosis and several lipid-mediated disorders.
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Affiliation(s)
- C Roger White
- Department of Medicine, UAB Medical Centre, Birmingham, AL, USA
| | | | - Paul Wolkowicz
- Department of Medicine, UAB Medical Centre, Birmingham, AL, USA
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3
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Lee MW, Luo EWC, Silvestre-Roig C, Srinivasan Y, Akabori K, Lemnitzer P, Schmidt NW, Lai GH, Santangelo CD, Soehnlein O, Wong GCL. Apolipoprotein Mimetic Peptide Inhibits Neutrophil-Driven Inflammatory Damage via Membrane Remodeling and Suppression of Cell Lysis. ACS NANO 2021; 15:15930-15939. [PMID: 34586780 PMCID: PMC8720511 DOI: 10.1021/acsnano.1c03978] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Neutrophils are crucial for host defense but are notorious for causing sterile inflammatory damage. Activated neutrophils in inflamed tissue can liberate histone H4, which was recently shown to perpetuate inflammation by permeating membranes via the generation of negative Gaussian curvature (NGC), leading to lytic cell death. Here, we show that it is possible to build peptides or proteins that cancel NGC in membranes and thereby suppress pore formation, and demonstrate that they can inhibit H4 membrane remodeling and thereby reduce histone H4-driven lytic cell death and resultant inflammation. As a demonstration of principle, we use apolipoprotein A-I (apoA-I) mimetic peptide apoMP1. X-ray structural studies and theoretical calculations show that apoMP1 induces nanoscopic positive Gaussian curvature (PGC), which interacts with the NGC induced by the N-terminus of histone H4 (H4n) to inhibit membrane permeation. Interestingly, we show that induction of PGC can inhibit membrane-permeating activity in general and "turn off" diverse membrane-permeating molecules besides H4n. In vitro experiments show an apoMP1 dose-dependent rescue of H4 cytotoxicity. Using a mouse model, we show that tissue accumulation of neutrophils, release of neutrophil extracellular traps (NETs), and extracellular H4 all strongly correlate independently with local tissue cell death in multiple organs, but administration of apoMP1 inhibits histone H4-mediated cytotoxicity and strongly prevents organ tissue damage.
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Affiliation(s)
- Michelle W Lee
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
| | - Elizabeth Wei-Chia Luo
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
| | - Carlos Silvestre-Roig
- Institute of Experimental Pathology, Center for Molecular Biology of Inflammation (ZMBE), University of Münster, 48149 Münster, Germany
- Institute for Cardiovascular Prevention (IPEK), LMU Munich, 80336 Munich, Germany
| | - Yashes Srinivasan
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
| | - Kiyotaka Akabori
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Patricia Lemnitzer
- Institute of Experimental Pathology, Center for Molecular Biology of Inflammation (ZMBE), University of Münster, 48149 Münster, Germany
| | - Nathan W Schmidt
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
- Ginkgo Bioworks, 27 Drydock Avenue, Boston, Massachusetts 02210, United States
| | - Ghee Hwee Lai
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
- Singapore Centre for Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, 60 Nanyang Drive, SBS-01N-27, Singapore 637551
| | - Christian D Santangelo
- Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States
- Department of Physics, Syracuse University, Syracuse, New York 13244, United States
| | - Oliver Soehnlein
- Institute of Experimental Pathology, Center for Molecular Biology of Inflammation (ZMBE), University of Münster, 48149 Münster, Germany
- Department of Physiology and Pharmacology (FyFa), Karolinska Institute, 171 77 Stockholm, Sweden
- Institute for Cardiovascular Prevention (IPEK), LMU Munich, 80336 Munich, Germany
| | - Gerard C L Wong
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
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Wolkowicz P, White CR, Anantharamaiah GM. Apolipoprotein Mimetic Peptides: An Emerging Therapy against Diabetic Inflammation and Dyslipidemia. Biomolecules 2021; 11:biom11050627. [PMID: 33922449 PMCID: PMC8146922 DOI: 10.3390/biom11050627] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/15/2021] [Accepted: 04/16/2021] [Indexed: 12/12/2022] Open
Abstract
Obesity has achieved epidemic status in the United States, resulting in an increase in type 2 diabetes mellitus, dyslipidemia, and cardiovascular disease. Numerous studies have shown that inflammation plays a key role in the development of insulin resistance and diabetic complications. HDL cholesterol levels are inversely associated with coronary heart disease in humans. The beneficial effect of HDL is due, in part, to apolipoproteins A-I and E, which possess anti-inflammatory properties. The functional quality of HDL, however, may be reduced in the context of diabetes. Thus, raising levels of functional HDL is an important target for reducing inflammation and diabetic complications. Apo A-I possesses eight alpha-helical sequences, most of which form class A amphipathic helical structures. Peptides belonging to this class inhibit atherogenesis in several mouse models. Additional peptides based on structural components of apoE have been shown to mediate a rapid clearance of atherogenic lipoproteins in dyslipidemic mice. In this review, we discuss the efficacy of apolipoprotein mimetic peptides in improving lipoprotein function, reducing inflammation, and reversing insulin resistance and cardiometabolic disease processes in diabetic animals.
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Nankar SA, Bulani Y, Sharma SS, Pande AH. ApoE-Derived Peptides Attenuated Diabetes-Induced Oxidative Stress and Inflammation. Protein Pept Lett 2020; 27:193-200. [PMID: 31577194 DOI: 10.2174/0929866526666191002112655] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 08/19/2019] [Accepted: 08/21/2019] [Indexed: 12/24/2022]
Abstract
BACKGROUND Peptides derived from the apolipoproteins (apo-mimetic peptides) have emerged as a potential candidate for the treatment of various inflammatory conditions. Our previous results have shown that peptides derived from human apolipoprotein-E interact with various pro-inflammatory lipids and inhibit their inflammatory functions in cellular assays. OBJECTIVE In this study, two apoE-derived peptides were selected to investigate their antiinflammatory and anti-oxidative effects in streptozotocin-induced diabetic model of inflammation and oxidative stress. METHODS The peptides were injected intraperitoneally into the streptozotocin-induced diabetic rats and their anti-inflammatory and anti-oxidative effects were evaluated by monitoring various oxidative and inflammatory markers. RESULTS Administration of 4F, E5 and E8 peptides decreased the oxidative and inflammatory markers in STZ-induced diabetic rats to different extent, while had no significant effect on the other diabetic parameters (viz. total body weight of animals and increased blood glucose level). E5 peptide was found to be relatively more effective than 4F and E8 peptides in decreasing inflammation and oxidative stress. CONCLUSION E5 peptide can be developed as a potential candidate for inflammatory conditions.
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Affiliation(s)
- Sunil A Nankar
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research (NIPER), Mohali - 160 062, Punjab, India
| | - Yogesh Bulani
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Mohali - 160062, Punjab, India
| | - Shyam S Sharma
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Mohali - 160062, Punjab, India
| | - Abhay H Pande
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research (NIPER), Mohali - 160 062, Punjab, India
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Hamid T, Ismahil MA, Bansal SS, Patel B, Goel M, White CR, Anantharamaiah GM, Prabhu SD. The Apolipoprotein A-I Mimetic L-4F Attenuates Monocyte Activation and Adverse Cardiac Remodeling after Myocardial Infarction. Int J Mol Sci 2020; 21:ijms21103519. [PMID: 32429244 PMCID: PMC7279031 DOI: 10.3390/ijms21103519] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/12/2020] [Accepted: 05/13/2020] [Indexed: 01/01/2023] Open
Abstract
Excessive inflammation after myocardial infarction (MI) can promote infarct expansion and adverse left ventricular (LV) remodeling. L-4F, a mimetic peptide of apolipoprotein A-I (apoA-I), exhibits anti-inflammatory and anti-atherogenic properties; however, whether L-4F imparts beneficial effects after myocardial infarction (MI) is unknown. Here we demonstrate that L-4F suppresses the expansion of blood, splenic, and myocardial pro-inflammatory monocytes and macrophages in a mouse model of reperfused MI. Changes in immune cell profiles were accompanied by alleviation of post-MI LV remodeling and dysfunction. In vitro, L-4F also inhibited pro-inflammatory and glycolytic gene expression in macrophages. In summary, L-4F treatment prevents prolonged and excessive inflammation after MI, in part through modulation of pro-inflammatory monocytes and macrophages, and improves post-MI LV remodeling. These data suggest that L-4F could be a used as a therapeutic adjunct in humans with MI to limit inflammation and alleviate the progression to heart failure.
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Affiliation(s)
- Tariq Hamid
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
- Correspondence: (T.H.); (S.D.P.)
| | - Mohamed Ameen Ismahil
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
| | - Shyam S. Bansal
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
| | - Bindiya Patel
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
| | - Mehak Goel
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
| | - C. Roger White
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
| | - G. M. Anantharamaiah
- Division of Gerontology, Geriatrics, and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA;
| | - Sumanth D. Prabhu
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (M.A.I.); (S.S.B.); (B.P.); (M.G.); (C.R.W.)
- Medical Service, Birmingham VAMC Birmingham, Birmingham, AL 35233, USA
- Correspondence: (T.H.); (S.D.P.)
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Zhang J, Cui Y, Li X, Xiao Y, Liu L, Jia F, He J, Xie X, Parthasarathy S, Hao H, Fang N. 5F peptide promotes endothelial differentiation of bone marrow stem cells through activation of ERK1/2 signaling. Eur J Pharmacol 2020; 876:173051. [PMID: 32145325 DOI: 10.1016/j.ejphar.2020.173051] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 02/25/2020] [Accepted: 02/28/2020] [Indexed: 11/29/2022]
Abstract
Synthetic apolipoprotein A-I (apoA-I) mimetic peptide 5F exhibits anti-atherosclerotic ability with largely unknown mechanism(s). Bone marrow (BM)-derived endothelial progenitor cells (EPCs) play a critical role in vascular integrity and function. The objective of the present study was to evaluate the effect of 5F on endothelial differentiation of BM stem cells and related mechanisms. Murine BM multipotent adult progenitor cells (MAPCs) were induced to differentiate into endothelial cells in vitro with or without 5F. The expression of endothelial markers vWF, Flk-1 and CD31 was significantly increased in the cells treated with 5F with enhanced in vitro vascular tube formation and LDL uptake without significant changes on proliferation and stem cell maker Oct-4 expression. Phosphorylated ERK1/2, not Akt, was significantly increased in 5F-treated cells. Treatment of MAPCs with PD98059 or small interfering RNA against ERK2 substantially attenuated ERK1/2 phosphorylation, and effectively prevented 5F-induced enhancement of endothelial differentiation of MAPCs. In vivo studies revealed that 5F increased EPCs number in the BM in mice after acute hindlimb ischemia that was effectively prevented with PD98059 treatment. These data supported the conclusion that 5F promoted endothelial differentiation of MAPCs through activation of ERK1/2 signaling.
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Affiliation(s)
- Jia Zhang
- Department of Geriatrics, Renji Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, 200127, China; Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Yuqi Cui
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Xin Li
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Yuan Xiao
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Lingjuan Liu
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Fengpeng Jia
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Jianfeng He
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Xiaoyun Xie
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Sampath Parthasarathy
- Burnett School of Biomedical Sciences, University of Central Florida College of Medicine, USA
| | - Hong Hao
- Davis Heart & Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Ningyuan Fang
- Department of Geriatrics, Renji Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, 200127, China.
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Apolipoprotein-AI mimetic peptides D-4F and L-5F decrease hepatic inflammation and increase insulin sensitivity in C57BL/6 mice. PLoS One 2020; 15:e0226931. [PMID: 31914125 PMCID: PMC6948736 DOI: 10.1371/journal.pone.0226931] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 12/06/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Apolipoprotein-AI (apo-AI) is the major apolipoprotein found in high density lipoprotein particles (HDLs). We previously demonstrated that apo-AI injected directly into high-fat diet fed mice improved insulin sensitivity associated with decreased hepatic inflammation. While our data provides compelling proof of concept, apoA-I mimetic peptides are more clinically feasible. The aim of this study was to test whether apo-AI mimetic peptide (D-4F and L-5F) treatment will emulate the effects of full-length apo-AI to improve insulin sensitivity. METHODS Male C57BL/6 mice were fed a high-fat diet for 16 weeks before receiving D4F mimetic peptide administered via drinking water or L5F mimetic peptide administered by intraperitoneal injection bi-weekly for a total of five weeks. Glucose tolerance and insulin tolerance tests were conducted to assess the effects of the peptides on insulin resistance. Effects of the peptides on inflammation, gluconeogenic enzymes and lipid synthesis were assessed by real-time PCR of key markers involved in the respective pathways. RESULTS Treatment with apo-AI mimetic peptides D-4F and L-5F showed: (i) improved blood glucose clearance (D-4F 1.40-fold AUC decrease compared to HFD, P<0.05; L-4F 1.17-fold AUC decrease compared to HFD, ns) in the glucose tolerance test; (ii) improved insulin tolerance (D-4F 1.63-fold AUC decrease compared to HFD, P<0.05; L-5F 1.39-fold AUC compared to HFD, P<0.05) in the insulin tolerance test. The metabolic test results were associated with (i) decreased hepatic inflammation of SAA1, IL-1β IFN-γ and TNFα (2.61-5.97-fold decrease compared to HFD, P<0.05) for both mimetics; (ii) suppression of hepatic mRNA expression of gluconeogenesis-associated genes (PEPCK and G6Pase; 1.66-3.01-fold decrease compared to HFD, P<0.001) for both mimetics; (iii) lipogenic-associated genes, (SREBP1c and ChREBP; 2.15-3.31-fold decrease compared to HFD, P<0.001) for both mimetics and; (iv) reduced hepatic macrophage infiltration (F4/80 and CD68; 1.77-2.15-fold compared to HFD, P<0.001) for both mimetics. CONCLUSION Apo-AI mimetic peptides treatment led to improved glucose homeostasis. This effect is associated with reduced expression of inflammatory markers in the liver and reduced infiltration of macrophages, suggesting an overall suppression of hepatic inflammation. We also showed altered expression of genes associated with gluconeogenesis and lipid synthesis, suggesting that glucose and lipid synthesis is suppressed. These findings suggest that apoA-I mimetic peptides could be a new therapeutic option to reduce hepatic inflammation that contributes to the development of overnutrition-induced insulin resistance.
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Rivas-Urbina A, Rull A, Montoliu-Gaya L, Pérez-Cuellar M, Ordóñez-Llanos J, Villegas S, Sánchez-Quesada JL. Low-density lipoprotein aggregation is inhibited by apolipoprotein J-derived mimetic peptide D-[113-122]apoJ. Biochim Biophys Acta Mol Cell Biol Lipids 2019; 1865:158541. [PMID: 31672573 DOI: 10.1016/j.bbalip.2019.158541] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 09/25/2019] [Accepted: 09/28/2019] [Indexed: 12/17/2022]
Abstract
Mimetic peptides are promising therapeutic agents for atherosclerosis prevention. A 10-residue class G* peptide from apolipoprotein J (apoJ), namely, D-[113-122]apoJ, possesses anti-inflammatory and anti-atherogenic properties. This prompted us to determine its effect on the aggregation process of low-density lipoprotein (LDL) particles, an early event in the development of atherosclerosis. LDL particles with and without [113-122]apoJ peptide were incubated at 37 °C with sphingomyelinase (SMase) or were left to aggregate spontaneously at room temperature. The aggregation process was analyzed by size-exclusion chromatography (SEC), native gradient gel electrophoresis (GGE), absorbance at 405 nm, dynamic light scattering (DLS), and transmission electronic microscopy (TEM). In addition, circular dichroism was used to determine changes in the secondary structure of apoB, and SDS-PAGE was performed to assess apoB degradation. At an equimolar ratio of [113-122]apoJ peptide to apoB-100, [113-122]apoJ inhibited both SMase-induced or spontaneous LDL aggregation. All methods showed that [113-122]apoJ retarded the progression of SMase-induced LDL aggregation at long incubation times. No effect of [113-122]apoJ on apoB secondary structure was observed. Binding experiments showed that [113-122]apoJ presents low affinity for native LDL but binds readily to LDL during the first stages of aggregation. Laurdan fluorescence experiments showed that mild aggregation of LDL resulted in looser lipid packaging, which was partially prevented by D-[113-122]apoJ. These results demonstrate that [113-122]apoJ peptide prevents SMase-induced LDL aggregation at an equimolar ratio and opens the possibility for the use of this peptide as a therapeutic tool.
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Affiliation(s)
- Andrea Rivas-Urbina
- Cardiovascular Biochemistry Group, Research Institute of the Hospital de Sant Pau (IIB Sant Pau), Barcelona, Spain; Biochemistry and Molecular Biology Department, Universitat Autònoma de Barcelona, Cerdanyola, Spain
| | - Anna Rull
- Cardiovascular Biochemistry Group, Research Institute of the Hospital de Sant Pau (IIB Sant Pau), Barcelona, Spain
| | - Laia Montoliu-Gaya
- Biochemistry and Molecular Biology Department, Universitat Autònoma de Barcelona, Cerdanyola, Spain
| | - Montserrat Pérez-Cuellar
- Cardiovascular Biochemistry Group, Research Institute of the Hospital de Sant Pau (IIB Sant Pau), Barcelona, Spain
| | - Jordi Ordóñez-Llanos
- Cardiovascular Biochemistry Group, Research Institute of the Hospital de Sant Pau (IIB Sant Pau), Barcelona, Spain; Biochemistry and Molecular Biology Department, Universitat Autònoma de Barcelona, Cerdanyola, Spain
| | - Sandra Villegas
- Biochemistry and Molecular Biology Department, Universitat Autònoma de Barcelona, Cerdanyola, Spain.
| | - Jose Luis Sánchez-Quesada
- Cardiovascular Biochemistry Group, Research Institute of the Hospital de Sant Pau (IIB Sant Pau), Barcelona, Spain; CIBER of Diabetes and Metabolic Diseases (CIBERDEM), Spain.
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10
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Rudolf M, Curcio CA, Schlötzer-Schrehardt U, Sefat AMM, Tura A, Aherrahrou Z, Brinkmann M, Grisanti S, Miura Y, Ranjbar M. Apolipoprotein A-I Mimetic Peptide L-4F Removes Bruch's Membrane Lipids in Aged Nonhuman Primates. ACTA ACUST UNITED AC 2019; 60:461-472. [DOI: 10.1167/iovs.18-25786] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Martin Rudolf
- Department of Ophthalmology, University of Lübeck, Lübeck, Germany
- Translational AMD Research Group Lübeck, University of Lübeck, Lübeck, Germany
| | - Christine A. Curcio
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, Alabama, United States
| | | | - Armin Mir Mohi Sefat
- Department of Ophthalmology, University of Lübeck, Lübeck, Germany
- Translational AMD Research Group Lübeck, University of Lübeck, Lübeck, Germany
| | - Aysegül Tura
- Department of Ophthalmology, University of Lübeck, Lübeck, Germany
| | - Zouhair Aherrahrou
- Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
- German Centre for Cardiovascular Research, Partner Site Hamburg/Kiel/Lübeck, Germany
- University Heart Centre Lübeck, Lübeck, Germany
| | - Max Brinkmann
- Department of Ophthalmology, University of Lübeck, Lübeck, Germany
- Laboratory for Angiogenesis & Ocular Cell Transplantation, University of Lübeck, Lübeck, Germany
| | | | - Yoko Miura
- Department of Ophthalmology, University of Lübeck, Lübeck, Germany
- Translational AMD Research Group Lübeck, University of Lübeck, Lübeck, Germany
- Institute of Biomedical Optics, University of Lübeck, Lübeck, Germany
| | - Mahdy Ranjbar
- Department of Ophthalmology, University of Lübeck, Lübeck, Germany
- Laboratory for Angiogenesis & Ocular Cell Transplantation, University of Lübeck, Lübeck, Germany
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11
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White CR, Giordano S, Anantharamaiah GM. High-density lipoprotein, mitochondrial dysfunction and cell survival mechanisms. Chem Phys Lipids 2016; 199:161-169. [PMID: 27150975 DOI: 10.1016/j.chemphyslip.2016.04.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 04/22/2016] [Accepted: 04/23/2016] [Indexed: 01/08/2023]
Abstract
Ischemic injury is associated with acute myocardial infarction, percutaneous coronary intervention, coronary artery bypass grafting and open heart surgery. The timely re-establishment of blood flow is critical in order to minimize cardiac complications. Reperfusion after a prolonged ischemic period, however, can induce severe cardiomyocyte dysfunction with mitochondria serving as a major target of ischemia/reperfusion (I/R) injury. An increase in the formation of reactive oxygen species (ROS) induces damage to mitochondrial respiratory complexes leading to uncoupling of oxidative phosphorylation. Mitochondrial membrane perturbations also contribute to calcium overload, opening of the mitochondrial permeability transition pore (mPTP) and the release of apoptotic mediators into the cytoplasm. Clinical and experimental studies show that ischemic preconditioning (ICPRE) and postconditioning (ICPOST) attenuate mitochondrial injury and improve cardiac function in the context of I/R injury. This is achieved by the activation of two principal cell survival cascades: 1) the Reperfusion Injury Salvage Kinase (RISK) pathway; and 2) the Survivor Activating Factor Enhancement (SAFE) pathway. Recent data suggest that high density lipoprotein (HDL) mimics the effects of conditioning protocols and attenuates myocardial I/R injury via activation of the RISK and SAFE signaling cascades. In this review, we discuss the roles of apolipoproteinA-I (apoA-I), the major protein constituent of HDL, and sphingosine 1-phosphate (S1P), a lysosphingolipid associated with small, dense HDL particles as mediators of cardiomyocyte survival. Both apoA-I and S1P exert an infarct-sparing effect by preventing ROS-dependent injury and inhibiting the opening of the mPTP.
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Affiliation(s)
- C Roger White
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - Samantha Giordano
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL, USA
| | - G M Anantharamaiah
- The Division of Gerontology, Geriatric Medicine and Palliative Care, University of Alabama at Birmingham, Birmingham, AL, USA; Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL, USA
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12
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Takata K, Imaizumi S, Kawachi E, Yahiro E, Suematsu Y, Shimizu T, Abe S, Matsuo Y, Nakajima K, Yasuno T, Jimi S, Zhang B, Uehara Y, Miura SI, Saku K. The ApoA-I mimetic peptide FAMP promotes recovery from hindlimb ischemia through a nitric oxide (NO)-related pathway. Int J Cardiol 2016; 207:317-25. [DOI: 10.1016/j.ijcard.2016.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 11/25/2015] [Accepted: 01/01/2016] [Indexed: 10/22/2022]
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13
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Zamanian-Daryoush M, DiDonato JA. Apolipoprotein A-I and Cancer. Front Pharmacol 2015; 6:265. [PMID: 26617517 PMCID: PMC4642354 DOI: 10.3389/fphar.2015.00265] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 10/23/2015] [Indexed: 12/22/2022] Open
Abstract
High-density lipoprotein (HDL) and apolipoprotein A-I (apoA-I), the predominant protein in plasma HDL, have long been the focus of intense studies in the field of atherosclerosis and cardiovascular disease. ApoA-I, in large part, is responsible for HDL assembly and its main atheroprotective function, that of shuttling excess cholesterol from peripheral tissues to the liver for excretion (reverse cholesterol transport). Recently, a protective role for HDL in cancer was suggested from several large clinical studies where an inverse relationship between plasma HDL-cholesterol (HDL-C) levels and risk of developing cancer was noted. This notion has now been tested and found to be supported in mouse tumor studies, where increasing levels of apoA-I/HDL were discovered to protect against tumor development and provision of human apoA-I was therapeutic against established tumors. This mini-review discusses the emerging role of apoA-I in tumor biology and its potential as cancer therapeutic.
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Affiliation(s)
- Maryam Zamanian-Daryoush
- Department of Cellular and Molecular Medicine, and Center for Cardiovascular Diagnostics and Prevention, Cleveland Clinic, Cleveland OH, USA
| | - Joseph A DiDonato
- Department of Cellular and Molecular Medicine, and Center for Cardiovascular Diagnostics and Prevention, Cleveland Clinic, Cleveland OH, USA
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14
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Bioenergetic programming of macrophages by the apolipoprotein A-I mimetic peptide 4F. Biochem J 2015; 467:517-27. [PMID: 25742174 DOI: 10.1042/bj20131635] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The apoA-I (apolipoprotein A-I) mimetic peptide 4F favours the differentiation of human monocytes to an alternatively activated M2 phenotype. The goal of the present study was to test whether the 4F-mediated differentiation of MDMs (monocyte-derived macrophages) requires the induction of an oxidative metabolic programme. 4F treatment induced several genes in MDMs that play an important role in lipid metabolism, including PPARγ (peroxisome-proliferator-activated receptor γ) and CD36. Addition of 4F was associated with a significant increase in FA (fatty acid) uptake and oxidation compared with vehicle treatment. Mitochondrial respiration was assessed by measurement of the OCR (oxygen-consumption rate). 4F increased basal and ATP-linked OCR as well as maximal uncoupled mitochondrial respiration. These changes were associated with a significant increase in ΔΨm (mitochondrial membrane potential). The increase in metabolic activity in 4F-treated MDMs was attenuated by etomoxir, an inhibitor of mitochondrial FA uptake. Finally, addition of the PPARγ antagonist T0070907 to 4F-treated MDMs reduced the expression of CD163 and CD36, cell-surface markers for M2 macrophages, and reduced basal and ATP-linked OCR. These results support our hypothesis that the 4F-mediated differentiation of MDMs to an anti-inflammatory phenotype is due, in part, to an increase in FA uptake and mitochondrial oxidative metabolism.
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Sharifov OF, Xu X, Gaggar A, Tabengwa EM, White CR, Palgunachari MN, Anantharamaiah GM, Gupta H. L-4F inhibits lipopolysaccharide-mediated activation of primary human neutrophils. Inflammation 2015; 37:1401-12. [PMID: 24647607 DOI: 10.1007/s10753-014-9864-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Human apolipoprotein A-I (apoA-I) mimetic L-4F inhibits acute inflammation in endotoxemic animals. Since neutrophils play a crucial role in septic inflammation, we examined the effects of L-4F, compared to apoA-I, on lipopolysaccharide (LPS)-mediated activation of human neutrophils. We performed bioassays in human blood, isolated human neutrophils (incubated in 50 % donor plasma), and isolated human leukocytes (incubated in 5 and 50 % plasma) in vitro. In whole blood, both L-4F and apoA-I inhibited LPS-mediated elevation of TNF-α and IL-6. In LPS-stimulated neutrophils, L-4F and apoA-I (40 μg/ml) also decreased myeloperoxidase and TNF-α levels; however, L-4F tended to be superior in inhibiting LPS-mediated increase in IL-6 levels, membrane lipid rafts abundance and CD11b expression. In parallel experiments, when TNF-α and IL-8, instead of LPS, was used for cell stimulation, L-4F and/or apoA-I revealed only limited efficacy. In LPS-stimulated leukocytes, L-4F was as effective as apoA-I in reducing superoxide formation in 50 % donor plasma, and more effective in 5 % donor plasma (P<0.05). Limulus ambocyte lysate (LAL) and surface plasmon resonance assays showed that L-4F neutralizes LAL endotoxin activity more effectively than apoA-I (P<0.05) likely due to avid binding to LPS. We conclude that (1) direct binding/neutralization of LPS is a major mechanism of L-4F in vitro; (2) while L-4F has similar efficacy to apoA-I in anti-endotoxin effects in whole blood, it demonstrates superior efficacy to apoA-I in aqueous solutions and fluids with limited plasma components. This study rationalizes the utility of L-4F in the treatment of inflammation that is mediated by endotoxin-activated neutrophils.
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Affiliation(s)
- Oleg F Sharifov
- Department of Medicine, University of Alabama at Birmingham, BDB-101, 1808 7th Avenue South, Birmingham, AL, 35294-0012, USA
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16
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Namiri-Kalantari R, Gao F, Chattopadhyay A, Wheeler AA, Navab KD, Farias-Eisner R, Reddy ST. The dual nature of HDL: Anti-Inflammatory and pro-Inflammatory. Biofactors 2015; 41:153-9. [PMID: 26072738 DOI: 10.1002/biof.1205] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 02/16/2015] [Indexed: 01/07/2023]
Abstract
High density lipoprotein (HDL) has long been considered a protective factor against the development of coronary heart disease. Two important roles of HDL include reverse cholesterol transport (RCT) and the modulation of inflammation. The main protein component of HDL; apolipoprotein A-I (apo A-I) is primarily responsible for RCT. Apo A-I can be damaged by oxidative mechanisms, which reduce the protein's ability to promote RCT. In disease states such as diabetes, associated with a chronic acute-phase response, HDL has been found to be dysfunctional and pro-inflammatory. HDL cholesterol levels do not predict composition and/or function and therefore it is important to evaluate the quality and not just the quantity of HDL cholesterol when considering the risk of cardiovascular events. In clinical practice, there are currently no widely available tests for measuring the composition, functionality, and inflammatory properties of HDL. Small peptides that mimic some of the properties of apo A-I have been shown in pre-clinical models to improve HDL function and reduce atherosclerosis without altering HDL cholesterol levels. Clinical trials using HDL and HDL mimetics as therapeutic agents are currently underway. Results in animal studies and early clinical trials will be reviewed.
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Affiliation(s)
- Ryan Namiri-Kalantari
- Departments of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Feng Gao
- Obstetrics and Gynecology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Arnab Chattopadhyay
- Departments of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Aerin Alese Wheeler
- Departments of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Kaveh D Navab
- Departments of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Robin Farias-Eisner
- Obstetrics and Gynecology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Srinivasa T Reddy
- Departments of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Obstetrics and Gynecology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
- Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
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Santos-Gallego CG, Badimon JJ, Rosenson RS. Beginning to understand high-density lipoproteins. Endocrinol Metab Clin North Am 2014; 43:913-47. [PMID: 25432389 DOI: 10.1016/j.ecl.2014.08.001] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This article reconciles the classic view of high-density lipoproteins (HDL) associated with low risk for cardiovascular disease (CVD) with recent data (genetics studies and randomized clinical trials) casting doubt over the widely accepted beneficial role of HDL regarding CVD risk. Although HDL cholesterol has been used as a surrogate measure to investigate HDL function, the cholesterol content in HDL particles is not an indicator of the atheroprotective properties of HDL. Thus, more precise measures of HDL metabolism are needed to reflect and account for the beneficial effects of HDL particles. Current and emerging therapies targeting HDL are discussed.
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Affiliation(s)
- Carlos G Santos-Gallego
- Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave Levy Place, Box 1030, New York, NY 10029, USA
| | - Juan J Badimon
- Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave Levy Place, Box 1030, New York, NY 10029, USA
| | - Robert S Rosenson
- Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave Levy Place, Box 1030, New York, NY 10029, USA.
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18
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White CR, Garber DW, Anantharamaiah GM. Anti-inflammatory and cholesterol-reducing properties of apolipoprotein mimetics: a review. J Lipid Res 2014; 55:2007-21. [PMID: 25157031 DOI: 10.1194/jlr.r051367] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Reduced levels of HDL cholesterol (HDL-C) are a strong independent predictor of coronary artery disease (CAD) risk. The major anti-atherogenic function of HDL is to mediate reverse cholesterol transport. This response is highly dependent on apoA-I and apoE, protein components of HDL. Randomized clinical trials have assessed effects of several classes of drugs on plasma cholesterol levels in CAD patients. Agents including cholestyramine, fibrates, niacin, and statins significantly lower LDL cholesterol (LDL-C) and induce modest increases in HDL-C, but tolerance issues and undesirable side effects are common. Additionally, residual risk may be present in patients with persistently low HDL-C and other complications despite a reduction in LDL-C. These observations have fueled interest in the development of new pharmacotherapies that positively impact circulating lipoproteins. The goal of this review is to discuss the therapeutic potential of synthetic apolipoprotein mimetic peptides. These include apoA-I mimetic peptides that have undergone initial clinical assessment. We also discuss newer apoE mimetics that mediate the clearance of atherogenic lipids from the circulation and possess anti-inflammatory properties. One of these (AEM-28) has recently been given orphan drug status and is undergoing clinical trials.
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Affiliation(s)
- C Roger White
- Department of Medicine, Divisions of Cardiovascular Disease, Gerontology, Geriatric Medicine University of Alabama at Birmingham, Birmingham, AL
| | - David W Garber
- Palliative Care, University of Alabama at Birmingham, Birmingham, AL
| | - G M Anantharamaiah
- Palliative Care, University of Alabama at Birmingham, Birmingham, AL Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL
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19
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Zhao Y, Black AS, Bonnet DJ, Maryanoff BE, Curtiss LK, Leman LJ, Ghadiri MR. In vivo efficacy of HDL-like nanolipid particles containing multivalent peptide mimetics of apolipoprotein A-I. J Lipid Res 2014; 55:2053-63. [PMID: 24975585 DOI: 10.1194/jlr.m049262] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We have observed that molecular constructs based on multiple apoA-I mimetic peptides attached to a branched scaffold display promising anti-atherosclerosis functions in vitro. Building on these promising results, we now describe chronic in vivo studies to assess anti-atherosclerotic efficacy of HDL-like nanoparticles assembled from a trimeric construct, administered over 10 weeks either ip or orally to LDL receptor-null mice. When dosed ip, the trimer-based nanolipids markedly reduced plasma LDL-cholesterol levels by 40%, unlike many other apoA-I mimetic peptides, and were substantially atheroprotective. Surprisingly, these nanoparticles were also effective when administered orally at a dose of 75 mg/kg, despite the peptide construct being composed of l-amino acids and being undetectable in the plasma. The orally administered nanoparticles reduced whole aorta lesion areas by 55% and aortic sinus lesion volumes by 71%. Reductions in plasma cholesterol were due to the loss of non-HDL lipoproteins, while plasma HDL-cholesterol levels were increased. At a 10-fold lower oral dose, the nanoparticles were marginally effective in reducing atherosclerotic lesions. Intriguingly, analogous results were obtained with nanolipids of the corresponding monomeric peptide. These nanolipid formulations provide an avenue for developing orally efficacious therapeutic agents to manage atherosclerosis.
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Affiliation(s)
- Yannan Zhao
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
| | - Audrey S Black
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
| | - David J Bonnet
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
| | - Bruce E Maryanoff
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
| | - Linda K Curtiss
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
| | - Luke J Leman
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
| | - M Reza Ghadiri
- Departments of Chemistry and Immunology and Microbial Science, Scripps Research Institute, La Jolla, CA 92037
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21
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Abstract
PURPOSE OF REVIEW To examine the current and future therapeutic option of HDL-based therapies. RECENT FINDINGS The inverse association between plasma level of high-density lipoprotein cholesterol (HDL-C) is strong and coherent across the population studied. In-vitro and in-vivo studies show the strong biological plausibility for HDL as a therapeutic target. Mendelian randomization does not support HDL-C as a causal (protective) cardiovascular risk factor, and clinical data does not support the concept that raising HDL-cholesterol mass alters the outcomes. Better biomarkers of HDL function are being examined in the clinical trials. These include cellular cholesterol efflux, antioxidant and anti-inflammatory effects, effects on vascular endothelial cells (inflammation and nitric oxide release) and endothelial progenitor cells. Novel therapeutic agents that alter HDL function are in advanced phase 3 trials and in early preclinical trials. These include inhibitors of cholesteryl ester transfer protein, reconstituted proteoliposomes, apolipoprotein A-I and HDL mimetic peptides and small molecules that increase apo A-I production rate. SUMMARY Targeting HDL-C has, to date, not led to changes in the cardiovascular outcomes. Novel therapeutic advances target the HDL function. In keeping with the recent 2013 American College of Cardiology/American Heart Association Guideline on the treatment of blood cholesterol to reduce atherosclerotic cardiovascular risk in adults, the major focus of prevention lies with LDL-cholesterol reduction.
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Affiliation(s)
- Anouar Hafiane
- McGill University Health Center/Royal Victoria Hospital, Montreal, Quebec, Canada
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23
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Sharifov OF, Nayyar G, Ternovoy VV, Palgunachari MN, Garber DW, Anantharamaiah G, Gupta H. Comparison of anti-endotoxin activity of apoE and apoA mimetic derivatives of a model amphipathic peptide 18A. Innate Immun 2013; 20:867-80. [PMID: 24323453 DOI: 10.1177/1753425913514621] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Endotoxemia is a major cause of chronic inflammation, and is an important pathogenic factor in the development of metabolic syndrome and atherosclerosis. Human apolipoprotein E (apoE) and apoA-I are protein components of high-density lipoprotein, which have strong anti-endotoxin activity. Here, we compared anti-endotoxin activity of Ac-hE18A-NH2 and 4F peptides, modified from model amphipathic helical 18A peptide, to mimic, respectively, apoE and apoA-I properties. Ac-hE18A-NH2, stronger than 4F, inhibited endotoxin activity and disaggregated Escherichia coli 055:B5 (wild smooth serotype). Ac-hE18A-NH2 and 4F inhibited endotoxin activity of E. coli 026:B6 (rough-like serotype) to a similar degree. This suggests that Ac-hE18A-NH2 as a dual-domain molecule might interact with both the lipid A and headgroup of smooth LPS, whereas 4F binds lipid A. In C57BL/6 mice, Ac-hE18A-NH2 was superior to 4F in inhibiting the inflammatory responses mediated by E. coli 055:B5, but not E. coli 026:B6. However, in THP-1 cells, isolated human primary leukocytes, and whole human blood, Ac-hE18A-NH2 reduced responses more strongly than 4F to both E. coli serotypes either when peptides were pre-incubated or co-incubated with LPS, indicating that Ac-hE18A-NH2 also has strong anti-inflammatory effects independent of endotoxin-neutralizing properties. In conclusion, Ac-hE18A-NH2 is more effective than 4F in inhibiting LPS-mediated inflammation, which opens prospective clinical applications for Ac-hE18A-NH2.
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Affiliation(s)
- Oleg F Sharifov
- Department of Medicine, University of Alabama at Birmingham, AL, USA
| | - Gaurav Nayyar
- Department of Medicine, University of Alabama at Birmingham, AL, USA
| | | | | | - David W Garber
- Department of Medicine, University of Alabama at Birmingham, AL, USA
| | - Gm Anantharamaiah
- Department of Medicine, University of Alabama at Birmingham, AL, USA Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, AL, USA
| | - Himanshu Gupta
- Department of Medicine, University of Alabama at Birmingham, AL, USA VA Medical Center, Birmingham, AL, USA
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24
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Retention of α-helical structure by HDL mimetic peptide ATI-5261 upon extensive dilution represents an important determinant for stimulating ABCA1 cholesterol efflux with high efficiency. Biochem Biophys Res Commun 2013; 441:71-6. [DOI: 10.1016/j.bbrc.2013.10.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Accepted: 10/05/2013] [Indexed: 11/20/2022]
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25
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Leman LJ, Maryanoff BE, Ghadiri MR. Molecules that mimic apolipoprotein A-I: potential agents for treating atherosclerosis. J Med Chem 2013; 57:2169-96. [PMID: 24168751 DOI: 10.1021/jm4005847] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Certain amphipathic α-helical peptides can functionally mimic many of the properties of full-length apolipoproteins, thereby offering an approach to modulate high-density lipoprotein (HDL) for combating atherosclerosis. In this Perspective, we summarize the key findings and advances over the past 25 years in the development of peptides that mimic apolipoproteins, especially apolipoprotein A-I (apoA-I). This assemblage of information provides a reasonably clear picture of the state of the art in the apolipoprotein mimetic field, an appreciation of the potential for such agents in pharmacotherapy, and a sense of the opportunities for optimizing the functional properties of HDL.
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Affiliation(s)
- Luke J Leman
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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26
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Ditiatkovski M, D’Souza W, Kesani R, Chin-Dusting J, de Haan JB, Remaley A, Sviridov D. An apolipoprotein A-I mimetic peptide designed with a reductionist approach stimulates reverse cholesterol transport and reduces atherosclerosis in mice. PLoS One 2013; 8:e68802. [PMID: 23874769 PMCID: PMC3706315 DOI: 10.1371/journal.pone.0068802] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 06/01/2013] [Indexed: 01/19/2023] Open
Abstract
Apolipoprotein A-I (apoA-I) mimetic peptides are considered a promising novel therapeutic approach to prevent and/or treat atherosclerosis. An apoA-I mimetic peptide ELK-2A2K2E was designed with a reductionist approach and has shown exceptional activity in supporting cholesterol efflux but modest anti-inflammatory and anti-oxidant properties in vitro. In this study we compared these in vitro properties with the capacity of this peptide to modify rates of reverse cholesterol transport and development of atherosclerosis in mouse models. The peptide enhanced the rate of reverse cholesterol transport in C57BL/6 mice and reduced atherosclerosis in Apoe(-/-) mice receiving a high fat diet. The peptide modestly reduced the size of the plaques in aortic arch, but was highly active in reducing vascular inflammation and oxidation. Administration of the peptide to Apoe(-/-) mice on a high fat diet reduced the levels of total, high density lipoprotein and non-high density lipoprotein cholesterol and triglycerides. It increased the proportion of smaller HDL particles in plasma at the expense of larger HDL particles, and increased the capacity of the plasma to support cholesterol efflux. Thus, ELK-2A2K2E peptide reduced atherosclerosis in Apoe(-/-) mice, however, the functional activity profile after chronic in vivo administration was different from that found in acute in vitro studies.
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Affiliation(s)
| | - Wilissa D’Souza
- Baker Heart and Diabetes Institute, Melbourne, Vic., Australia
| | - Rajitha Kesani
- Baker Heart and Diabetes Institute, Melbourne, Vic., Australia
| | | | - Judy B. de Haan
- Baker Heart and Diabetes Institute, Melbourne, Vic., Australia
| | - Alan Remaley
- Lipoprotein Section, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Dmitri Sviridov
- Baker Heart and Diabetes Institute, Melbourne, Vic., Australia
- * E-mail:
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27
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Sharifov OF, Nayyar G, Ternovoy VV, Mishra VK, Litovsky SH, Palgunachari MN, Garber DW, Anantharamaiah GM, Gupta H. Cationic peptide mR18L with lipid lowering properties inhibits LPS-induced systemic and liver inflammation in rats. Biochem Biophys Res Commun 2013; 436:705-10. [PMID: 23791744 DOI: 10.1016/j.bbrc.2013.06.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 06/07/2013] [Indexed: 10/26/2022]
Abstract
The cationic single domain peptide mR18L has demonstrated lipid-lowering and anti-atherogenic properties in different dyslipidemic mouse models. Lipopolysaccharide (LPS)-mediated inflammation is considered as one of the potential triggers for atherosclerosis. Here, we evaluated anti-inflammatory effects of mR18L peptide against LPS-mediated inflammation. First, we tested the efficacy and tolerance of 1, 2.5 and 5mg/kg mR18L in normolipidemic rats stimulated with 5mg/kg LPS. LPS and then mR18L were injected in different intraperitoneal regions. By 2h post LPS, mR18L inhibited LPS-mediated plasma TNF-α elevation at all doses, with the effect being stronger for 2.5mg/kg (P<0.05 vs. 1mg/kg, non-significant vs. 5mg/kg). In a similar model, 2.5mg/kg mR18L reduced LPS-mediated inflammation in the liver, as assessed by microscopic examination of liver sections and measurements of iNOS expression in the liver tissue. In plasma, 2.5mg/kg mR18L decreased levels of TNF-α and IL-6, decreased endotoxin activity and enhanced HDL binding to LPS. In another similar experiment, mR18L administered 1h post LPS, prevented elevation of plasma triglycerides by 6h post LPS and increased plasma activity of anti-oxidant enzyme paraoxonase 1, along with noted trends in reducing plasma levels of endotoxin and IL-6. Surface plasmon resonance study revealed that mR18L readily binds LPS. We conclude that mR18L exerts anti-endotoxin activity at least in part due to direct LPS-binding and LPS-neutralizing effects. We suggest that anti-endotoxin activity of mR18L is an important anti-inflammatory property, which may increase anti-atherogenic potential of this promising orally active lipid-lowering peptide.
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Affiliation(s)
- Oleg F Sharifov
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35216, United States
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28
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Sharifov OF, Xu X, Gaggar A, Grizzle WE, Mishra VK, Honavar J, Litovsky SH, Palgunachari MN, White CR, Anantharamaiah GM, Gupta H. Anti-inflammatory mechanisms of apolipoprotein A-I mimetic peptide in acute respiratory distress syndrome secondary to sepsis. PLoS One 2013; 8:e64486. [PMID: 23691230 PMCID: PMC3653907 DOI: 10.1371/journal.pone.0064486] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Accepted: 04/14/2013] [Indexed: 01/11/2023] Open
Abstract
Acute respiratory distress syndrome (ARDS) due to sepsis has a high mortality rate with limited treatment options. High density lipoprotein (HDL) exerts innate protective effects in systemic inflammation. However, its role in ARDS has not been well studied. Peptides such as L-4F mimic the secondary structural features and functions of apolipoprotein (apo)A-I, the major protein component of HDL. We set out to measure changes in HDL in sepsis-mediated ARDS patients, and to study the potential of L-4F to prevent sepsis-mediated ARDS in a rodent model of lipopolysaccharide (LPS)-mediated acute lung injury, and a combination of primary human leukocytes and human ARDS serum. We also analyzed serum from non-lung disease intubated patients (controls) and sepsis-mediated ARDS patients. Compared to controls, ARDS demonstrates increased serum endotoxin and IL-6 levels, and decreased HDL, apoA-I and activity of anti-oxidant HDL-associated paraoxanase-1. L-4F inhibits the activation of isolated human leukocytes and neutrophils by ARDS serum and LPS in vitro. Further, L-4F decreased endotoxin activity and preserved anti-oxidant properties of HDL both in vitro and in vivo. In a rat model of severe endotoxemia, L-4F significantly decreased mortality and reduces lung and liver injury, even when administered 1 hour post LPS. Our study suggests the protective role of the apoA-I mimetic peptide L-4F in ARDS and gram-negative endotoxemia and warrant further clinical evaluation. The main protective mechanisms of L-4F are due to direct inhibition of endotoxin activity and preservation of HDL anti-oxidant activity.
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Affiliation(s)
- Oleg F. Sharifov
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Xin Xu
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Amit Gaggar
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- Medicine Service, United States Department of Veterans Affairs Medical Center, Birmingham, Alabama, United States of America
| | - William E. Grizzle
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Vinod K. Mishra
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Jaideep Honavar
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Silvio H. Litovsky
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Mayakonda N. Palgunachari
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - C. Roger White
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - G. M. Anantharamaiah
- Department of Medicine, Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Himanshu Gupta
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- Medicine Service, United States Department of Veterans Affairs Medical Center, Birmingham, Alabama, United States of America
- * E-mail:
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Chattopadhyay A, Navab M, Hough G, Gao F, Meriwether D, Grijalva V, Springstead JR, Palgnachari MN, Namiri-Kalantari R, Su F, Van Lenten BJ, Wagner AC, Anantharamaiah GM, Farias-Eisner R, Farias-Eisener R, Reddy ST, Fogelman AM. A novel approach to oral apoA-I mimetic therapy. J Lipid Res 2013; 54:995-1010. [PMID: 23378594 DOI: 10.1194/jlr.m033555] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Transgenic tomato plants were constructed with an empty vector (EV) or a vector expressing an apoA-I mimetic peptide, 6F. EV or 6F tomatoes were harvested, lyophilized, ground into powder, added to Western diet (WD) at 2.2% by weight, and fed to LDL receptor-null (LDLR(-/-)) mice at 45 mg/kg/day 6F. After 13 weeks, the percent of the aorta with lesions was 4.1 ± 4%, 3.3 ± 2.4%, and 1.9 ± 1.4% for WD, WD + EV, and WD + 6F, respectively (WD + 6F vs. WD, P = 0.0134; WD + 6F vs. WD + EV, P = 0.0386; WD + EV vs. WD, not significant). While body weight did not differ, plasma serum amyloid A (SAA), total cholesterol, triglycerides, and lysophosphatidic acid (LPA) levels were less in WD + 6F mice; P < 0.0295. HDL cholesterol and paroxonase-1 activity (PON) were higher in WD + 6F mice (P = 0.0055 and P = 0.0254, respectively), but not in WD + EV mice. Plasma SAA, total cholesterol, triglycerides, LPA, and 15-hydroxyeicosatetraenoic acid (HETE) levels positively correlated with lesions (P < 0.0001); HDL cholesterol and PON were inversely correlated (P < 0.0001). After feeding WD + 6F: i) intact 6F was detected in small intestine (but not in plasma); ii) small intestine LPA was decreased compared with WD + EV (P < 0.0469); and iii) small intestine LPA 18:2 positively correlated with the percent of the aorta with lesions (P < 0.0179). These data suggest that 6F acts in the small intestine and provides a novel approach to oral apoA-I mimetic therapy.
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Affiliation(s)
- Arnab Chattopadhyay
- Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA 90095, USA
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Handattu SP, Nayyar G, Garber DW, Palgunachari MN, Monroe CE, Keenum TD, Mishra VK, Datta G, Anantharamaiah GM. Two apolipoprotein E mimetic peptides with similar cholesterol reducing properties exhibit differential atheroprotective effects in LDL-R null mice. Atherosclerosis 2012; 227:58-64. [PMID: 23159231 DOI: 10.1016/j.atherosclerosis.2012.10.064] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 10/23/2012] [Accepted: 10/26/2012] [Indexed: 10/27/2022]
Abstract
OBJECTIVE We investigated two apoE mimetic peptides with similar long-term plasma cholesterol reducing abilities for their effects on atherosclerotic lesions in Western diet-fed female LDL-receptor (LDL-R) null mice. METHODS AND RESULTS Single doses of peptides Ac-hE18A-NH(2) and mR18L were administered retro-orbitally to LDL-R null mice on Western diet and plasma cholesterol was measured at 10 min, 4 h, and 24 h post administration. Peptide mR18L and not Ac-hE18A-NH(2) reduced plasma cholesterol levels significantly at 4 h post administration. However, multiple administrations (100 μg/mouse twice weekly for 8 weeks) resulted in a similar reduction in plasma cholesterol. Only the plasma from the Ac-hE18A-NH(2) group had significantly reduced reactive oxygen species levels at the end of the treatment protocol. Both mR18L and Ac-hE18A-NH(2) showed reduced atherosclerotic lesion areas. However, peptide Ac-hE18A-NH(2) was significantly more effective in inhibiting atherosclerosis. Both peptides reduced total plaque macrophage load compared to the saline treated animals, with peptide Ac-hE18A-NH(2) having a greater reduction. Incubation of HepG2 cells and THP-1 monocyte-derived macrophages with both peptides in the presence of oxidized phospholipid showed that Ac-hE18A-NH(2) promotes the secretion of apoE from the cells whereas mR18L does not. CONCLUSIONS Despite similar reductions in plasma cholesterol levels, Ac-hE18A-NH(2) was more effective in inhibiting lesions than mR18L, possibly due to its ability to promote the secretion of apoE from hepatocytes and macrophages.
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Affiliation(s)
- Shaila P Handattu
- Department of Medicine and Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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Navab M, Anantharamaiah GM, Reddy ST, Van Lenten BJ, Buga GM, Fogelman AM. Peptide Mimetics of Apolipoproteins Improve HDL Function. J Clin Lipidol 2012; 1:142-7. [PMID: 18449337 DOI: 10.1016/j.jacl.2007.03.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Over the past decade evidence has accumulated that suggests that the anti-inflammatory properties of HDL may be at least as important as the levels of HDL-cholesterol. The recent failure of the torcetrapib clinical trails has highlighted the potential differences between HDL-cholesterol levels and HDL function. Agents to improve HDL function including HDL anti-inflammatory properties provide a new therapeutic strategy for ameliorating atherosclerosis and other chronic inflammatory conditions related to dyslipidemia. Seeking guidance from the structure of the apolipoproteins of the plasma lipoproteins has allowed the creation of a series of polypeptides that have interesting functionality with therapeutic implications. In animal models of atherosclerosis, peptide mimetics of apolipoproteins have been shown to improve the anti-inflammatory properties of HDL, significantly reduce lesions and improve vascular inflammation and function without necessarily altering HDL-cholesterol levels. Some of these are now entering the clinical arena as interventions in pharmacologic and pharmacodynamic studies.
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Affiliation(s)
- Mohamad Navab
- David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679
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Apolipoprotein E mimetic is more effective than apolipoprotein A-I mimetic in reducing lesion formation in older female apo E null mice. Atherosclerosis 2012; 224:326-31. [PMID: 22771190 DOI: 10.1016/j.atherosclerosis.2012.05.040] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Revised: 05/01/2012] [Accepted: 05/30/2012] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The apolipoprotein E mimetic peptide Ac-hE18A-NH(2), capable of reducing plasma cholesterol and possessing anti-inflammatory properties, was compared with the well-studied anti-atherogenic apoA-I mimetic peptide 4F for reducing lesion formation in female apoE null mice with already existing lesions. METHODS AND RESULTS In initial experiments, Ac-hE18A-NH(2) was administered retro-orbitally two or three times weekly for 6-8 weeks, while peptide 4F was administered intraperitoneally every day for the same period. Age matched controls were injected with saline every day. At the end of the treatment period, plasma cholesterol levels of Ac-hE18A-NH(2) administered mice were significantly lower than in 4F and control mice. However, both 4F and Ac-hE18A-NH(2) showed reduced lesion areas in en face lesion analysis to a similar extent compared to the control group, while paraoxonase-1 (PON-1) activity was increased only in the Ac-hE18A-NH(2) group. In the third experiment, both peptides were administered at the same dose, frequency, and route of administration. The reduction in en face lesions with Ac-hE18A-NH(2) was significantly greater than the 4F and control groups, although lesions in 4F-treated mice were also significantly reduced compared with controls. Both peptide groups had significantly reduced plasma lipid hydroperoxides, but only the Ac-hE18A-NH(2) group had significantly reduced serum amyloid A levels. HDL and plasma inflammatory indices were significantly reduced in both peptide groups compared with controls. CONCLUSIONS Although both peptides had similar anti-inflammatory properties, Ac-hE18A-NH(2) was more effective in inhibiting lesions than 4F at the same dose, frequency, and route of administration, perhaps due to its cholesterol reducing properties.
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Residual cardiovascular risk despite optimal LDL cholesterol reduction with statins: the evidence, etiology, and therapeutic challenges. Curr Atheroscler Rep 2012; 14:1-10. [PMID: 22102062 DOI: 10.1007/s11883-011-0219-7] [Citation(s) in RCA: 276] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This review captures the existence, cause, and treatment challenges of residual cardiovascular risk (CVR) after aggressive low-density lipoprotein cholesterol (LDL-C) reduction. Scientific evidence implicates low high-density lipoprotein cholesterol (HDL-C) and high triglycerides (TG) in the CVR observed after LDL-C lowering. However, the Action to Control Cardiovascular Risk in Diabetes (ACCORD) lipid trial with fenofibrate, the Investigation of Lipid Level Management to Understand its Impact in Atherosclerotic Events (ILLUMINATE) study with torcetrapib, and the recently terminated Atherothrombosis Intervention in Metabolic Syndrome with Low HDL Cholesterol/High Triglyceride and Impact on Global Health Outcomes (AIM-HIGH) study with niacin, do not clearly attribute risk reduction value to HDL-C/TG modulation. The optimum approach to long-term lipid-modifying therapies for CVR reduction remains uncertain. Consequently, absolute risk modulation via lifestyle changes remains the centerpiece of a strategy addressing the physiologic drivers of CVR associated with HDL-C/TG, especially in the context of diabetes/metabolic syndrome.
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Qin S, Kamanna VS, Lai JH, Liu T, Ganji SH, Zhang L, Bachovchin WW, Kashyap ML. Reverse D4F, an apolipoprotein-AI mimetic peptide, inhibits atherosclerosis in ApoE-null mice. J Cardiovasc Pharmacol Ther 2012; 17:334-43. [PMID: 22308547 DOI: 10.1177/1074248411434598] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Synthetic class A amphipathic helical peptide analogs of apolipoprotein-AI (apoAI; with varied phenylalanine residues) are emerging therapeutic approaches under investigation for atherosclerosis. Utilizing retroinverso sequencing, we designed reverse-D4F (Rev-D4F) peptide with 18 d-amino acids containing 4 phenylalanine residues and reverse order that allows the side chain residues to be of exact alignment and superimposable to those of the parent l-amino acid peptide. This study examined the effect of Rev-D4F on atherosclerosis in apolipoprotein E (apoE)-null mice and the underlying mechanisms. MATERIALS/METHODS ApoE-null mice were fed a chow diet and administered water (control), Rev-D4F, or L4F mimetic peptides (0.4 mg/mL, equivalent to 1.6 mg/d) orally in drinking water for 6 weeks. Aortic root atherosclerotic lesion area, lesion macrophage content, and the ability of plasma high-density lipoprotein (HDL) to influence monocyte chemotaxis were measured. RESULTS Rev-D4F significantly decreased aortic sinus atherosclerotic lesion area and lesion macrophage content without affecting plasma total and HDL-cholesterol levels in apoE-null mice. The HDL from Rev-D4F-treated mice showed enhanced anti-inflammatory monocyte chemotactic activity, while low-density lipoprotein (LDL) exhibited reduced proinflammatory activity. In in vitro studies, Rev-D4F inhibited LDL oxidation, endothelial cell vascular cell adhesion molecule 1 (VCAM-1), and monocyte chemotactic factor 1 (MCP-1) expression, and monocyte adhesion to aortic endothelial cells. CONCLUSIONS The Rev-D4F inhibits atherosclerosis by inhibiting endothelial inflammatory/oxidative events and improving HDL function. The data suggest that Rev-D4F may be an effective apoAI mimetic peptide for further development in preventing atherosclerosis.
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Affiliation(s)
- Shucun Qin
- Department of Veterans Affairs Healthcare System, Atherosclerosis Research Center, Long Beach, CA 90822, USA
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Di Bartolo BA, Vanags LZ, Tan JT, Bao S, Rye KA, Barter PJ, Bursill CA. The apolipoprotein A-I mimetic peptide, ETC-642, reduces chronic vascular inflammation in the rabbit. Lipids Health Dis 2011; 10:224. [PMID: 22128776 PMCID: PMC3276454 DOI: 10.1186/1476-511x-10-224] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Accepted: 11/30/2011] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND High-density lipoproteins (HDL) and their main apolipoprotein, apoA-I, exhibit anti-inflammatory properties. The development of peptides that mimic HDL apolipoproteins offers a promising strategy to reduce inflammatory disease. This study aimed to compare the anti-inflammatory effects of ETC-642, an apoA-I mimetic peptide, with that of discoidal reconstituted HDL (rHDL), consisting of full-length apoA-I complexed with phosphatidylcholine, in rabbits with chronic vascular inflammation. RESULTS New Zealand White rabbits (n = 10/group) were placed on chow supplemented with 0.2% (w/w) cholesterol for 6-weeks. The animals received two infusions of saline, rHDL (8 mg/kg apoA-I) or ETC-642 (30 mg/kg peptide) on the third and fifth days of the final week. The infusions of rHDL and ETC-642 were able to significantly reduce cholesterol-induced expression of intracellular cell adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) in the thoracic aorta (p < 0.05). When isolated rabbit HDL was pre-incubated with human coronary artery endothelial cells (HCAECs), prior to stimulation with TNF-α, it was found that HDL from ETC-642 treated rabbits were more effective at inhibiting the TNF-α-induced increase in ICAM-1, VCAM-1 and p65 than HDL isolated from saline treated rabbits (p < 0.05). There were, however, no changes in HDL lipid composition between treatment groups. CONCLUSIONS Infusion of ETC-642 causes anti-inflammatory effects that are comparable to rHDL in an animal model of chronic vascular inflammation and highlights that apoA-I mimetic peptides present a viable strategy for the treatment of inflammatory disease.
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Affiliation(s)
- Belinda A Di Bartolo
- Lipid Research Group, Heart Research Institute, 7 Eliza St, Newtown, NSW 2042, Australia
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Meriwether D, Imaizumi S, Grijalva V, Hough G, Vakili L, Anantharamaiah GM, Farias-Eisner R, Navab M, Fogelman AM, Reddy ST, Shechter I. Enhancement by LDL of transfer of L-4F and oxidized lipids to HDL in C57BL/6J mice and human plasma. J Lipid Res 2011; 52:1795-809. [PMID: 21804067 DOI: 10.1194/jlr.m016741] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The apoA-I mimetic peptide L-4F [(Ac-D-W-F-K-A-F-Y-D-K-V-A-E-K-F-K-E-A-F-NH2) synthesized from all L-amino acids] has shown potential for the treatment of a variety of diseases. Here, we demonstrate that LDL promotes association between L-4F and HDL. A 2- to 3-fold greater association of L-4F with human HDL was observed in the presence of human LDL as compared with HDL by itself. This association further increased when LDL was supplemented with the oxidized lipid 15S-hydroxy-5Z, 8Z, 11Z, 13E-eicosatetraenoic acid (15HETE). Additionally, L-4F significantly (P = 0.02) promoted the transfer of 15HETE from LDL to HDL. The transfer of L-4F from LDL to HDL was demonstrated both in vitro and in C57BL/6J mice. L-4F, injected into C57BL/6J mice, associated rapidly with HDL and was then cleared quickly from the circulation. Similarly, L-4F loaded onto human HDL and injected into C57BL/6J mice was cleared quickly with T(1/2) = 23.6 min. This was accompanied by a decline in human apoA-I with little or no effect on the mouse apoA-I. Based on these results, we propose that i) LDL promotes the association of L-4F with HDL and ii) in the presence of L-4F, oxidized lipids in LDL are rapidly transferred to HDL allowing these oxidized lipids to be acted upon by HDL-associated enzymes and/or cleared from the circulation.
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Affiliation(s)
- David Meriwether
- Department of Obstetrics and Gynecology, University of California Los Angeles, Los Angeles, CA, USA
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Abstract
OPINION STATEMENT The treatment of lipid abnormalities generally has focused on low-density lipoprotein cholesterol (LDL-C) reduction based on extensive clinical trials and the National Cholesterol Education Program Adult Treatment Panel III guidelines. Unfortunately, it has become increasingly clear that a significant percentage of patients continue to have cardiovascular events despite being on LDL-C-lowering medications and having LDL-C levels below 100 mg/dL. Numerous epidemiologic studies have associated low high-density lipoprotein cholesterol (HDL-C) levels with increased risk of cardiovascular disease (CVD). Furthermore, recent data show that up to 55% of patients hospitalized for CVD have low HDL-C levels (<40 mg/dL) on admission, suggesting a possible target for further reducing CVD. Low HDL-C also is part of the atherogenic phenotype associated with obesity, glucose intolerance, and hypertension, termed the metabolic syndrome, and often is seen in patients with insulin resistance states. In general, the first line of therapy for increasing HDL-C in patients with levels below 40 mg/dL is lifestyle modification with smoking cessation, exercise, weight loss, and diet modifications. The pharmacologic treatment of isolated low HDL-C in patients without coronary disease is controversial but should be considered in those with a strong family history of CVD. In patients with coronary artery disease and isolated low HDL-C, statins remain the first-line therapy and should be instituted after lifestyle modifications, with the goal of increasing HDL-C above 40 mg/dL. If concomitant hypertriglyceridemia is present, a fibrate or niacin should be considered. Although statins do offer some HDL-C-raising properties, they tend to have modest effects. If treatment goals have not been achieved with either lifestyle changes or statin therapy, then the next agent of choice is niacin. Among the various HDL-C-raising therapies, niacin continues to be the most potent therapeutic option available. There are several novel HDL-C therapies in the research pipeline; however, only one class of medications is relatively close to clinical use, the cholesteryl ester transferase protein (CETP) inhibitors. Although one of the CETP inhibitors, torcetrapib, has received much negative attention from a large randomized trial showing increased mortality associated with its use, the overall class of therapeutic agents may still hold some benefit. Currently, two new CETP inhibitors without the off-target effects of torcetrapib are undergoing clinical research. Overall, the use of HDL-C-modifying agents likely will increase over the next decade.
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Imaizumi S, Navab M, Morgantini C, Charles-Schoeman C, Su F, Gao F, Kwon M, Ganapathy E, Meriwether D, Farias-Eisner R, Fogelman AM, Reddy ST. Dysfunctional high-density lipoprotein and the potential of apolipoprotein A-1 mimetic peptides to normalize the composition and function of lipoproteins. Circ J 2011; 75:1533-8. [PMID: 21628835 DOI: 10.1253/circj.cj-11-0460] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Although high-density lipoprotein-cholesterol (HDL-C) levels in large epidemiological studies are inversely related to the risk of coronary heart disease (CHD), increasing the level of circulating HDL-C does not necessarily decrease the risk of CHD events, CHD deaths, or mortality. HDL can act as an anti- or a pro-inflammatory molecule, depending on the context and environment. Based on a number of recent studies, it appears that the anti- or pro-inflammatory nature of HDL may be a more sensitive indicator of the presence or absence of atherosclerosis than HDL-C levels. The HDL proteome has been suggested to be a marker, and perhaps a mediator, of CHD. Apolipoprotein A-1 (apoA-I), the major protein in HDL is a selective target for oxidation by myeloperoxidase, which results in impaired HDL function. Improving HDL function through modification of its lipid and/or protein content maybe a therapeutic target for the treatment of CHD and many inflammatory disorders. HDL/apoA-I mimetic peptides may have the ability to modify the lipid and protein content of HDL and convert dysfunctional HDL to functional HDL. This review focuses on recent studies of dysfunctional HDL in animal models and human disease, and the potential of apoA-I mimetic peptides to normalize the composition and function of lipoproteins.
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Affiliation(s)
- Satoshi Imaizumi
- Department of Medicine, University of California, Los Angeles, CA, USA
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Santos-Gallego CG, Torres F, Badimón JJ. The beneficial effects of HDL-C on atherosclerosis: rationale and clinical results. ACTA ACUST UNITED AC 2011. [DOI: 10.2217/clp.10.90] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Fioravanti J, Medina-Echeverz J, Berraondo P. Scavenger receptor class B, type I: a promising immunotherapy target. Immunotherapy 2011; 3:395-406. [DOI: 10.2217/imt.10.104] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Scavenger receptor class B, type I (SR-BI) is a crucial molecule in lipid metabolism, since the interaction of high-density lipoproteins (HDLs) with SR-BI is involved in reverse cholesterol transport and cholesterol efflux. Recent findings also underscore a critical role of SR-BI in antimicrobial and immune responses. SR-BI is not only highly expressed in liver and steroidogenic glands, but also in endothelial cells, macrophages and dendritic cells. SR-BI mainly mediates anti-inflammatory responses, which may be altered by dysfunctional HDLs produced in several diseases. Moreover, SR-BI has been involved in the capture and cross-presentation of antigens from viruses, bacteria and parasites. It thus works as a pattern-recognition receptor that interacts with both damage-associated molecular patterns and pathogen-associated molecular patterns. These new findings in the microbiology and immunology fields present SR-BI as an unexplored therapeutic target that warrants further basic and applied research.
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Affiliation(s)
- Jessica Fioravanti
- Division of Hepatology & Gene Therapy, Center for Applied Medical Research, University of Navarra, Pamplona, Navarra, Spain
| | - José Medina-Echeverz
- Division of Hepatology & Gene Therapy, Center for Applied Medical Research, University of Navarra, Pamplona, Navarra, Spain
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Abstract
PURPOSE OF REVIEW To review published data related to the potential applicability of apolipoprotein A-I mimetic peptides. RECENT FINDINGS Despite a wealth of information on HDL-C levels and risk for cardiovascular disease (CVD), little evidence is present to suggest that raising HDL-C levels per se will result in CVD risk reduction. Rather, increasing HDL functionality might be a more successful strategy to reverse the process of atherosclerosis. In as such, apoA-I mimetic peptides, either in single or tandem formulation, hold great promise. Evidence gathered over the last years has provided insight in the extent to which mimetics influence several cardio metabolic pathways. ApoA-I mimetics have shown to have anti-inflammatory, antioxidant, and antiatherogenic effects. Direct comparisons between different mimetics have provided insight in factors influencing the differential beneficial consequences of these peptides. Data derived from recent studies suggest that mimetics might gain their position as a therapeutic intervention in the treatment of septicaemia, transplantation rejection, diabetes and auto-immune diseases. SUMMARY This review provides a summary of the current literature on the potential application of apoA-I mimetics as therapeutic agents. There is increasing evidence that these mimetics should be considered as a promising supplement to current strategies. Results from human studies addressing the in-vivo effects of the different apoA-I mimetics are eagerly awaited.
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Affiliation(s)
- G K Hovingh
- Department Vascular Medicine, Academic Medical Center, Meibergdreef 9 F4-159.2, 1100DD Amsterdam, The Netherlands.
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Nayyar G, Handattu SP, Monroe CE, Chaddha M, Datta G, Mishra VK, Keenum TD, Palgunachari MN, Garber DW, Anantharamaiah GM. Two adjacent domains (141-150 and 151-160) of apoE covalently linked to a class A amphipathic helical peptide exhibit opposite atherogenic effects. Atherosclerosis 2010; 213:449-57. [PMID: 21030022 DOI: 10.1016/j.atherosclerosis.2010.09.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Revised: 09/09/2010] [Accepted: 09/28/2010] [Indexed: 10/19/2022]
Abstract
OBJECTIVE We recently described anti-atherogenic properties of the dual domain peptide Ac-hE18A-NH(2) derived by covalently linking the heparin binding domain 141-150 of apoE to 18A, a class A amphipathic helical peptide. In this paper we have compared the properties of Ac-hE18A-NH(2) with the non-heparin binding 151-160 region of apoE linked to 18A (Ac-nhE18A-NH(2)). METHODS AND RESULTS Both peptides were highly helical in solution and in association with lipids. Ac-hE18A-NH(2) and not Ac-nhE18A-NH(2) enhanced uptake of low density lipoprotein (LDL) in HepG2 cells. While Ac-hE18A-NH(2) retarded the electrophoretic mobility of LDL, Ac-nhE18A-NH(2) slightly enhanced mobility. Ac-hE18A-NH(2) reduced monocyte association with endothelial cells, while Ac-nhE18A-NH(2) increased it. Ac-hE18A-NH(2) also reduced lipid hydroperoxide content of LDL while Ac-nhE18A-NH(2) increased it. A single administration of Ac-hE18A-NH(2) (100 μg/mouse) into apoE null mice dramatically reduced cholesterol (from 600 mg/dL to 180 mg/dL at 5 min and to 60 mg/dL at 5h) while Ac-nhE18A-NH(2) had no effect. Administration (100 μg/mouse/day, three days a week) into apoE null mice for six weeks showed Ac-hE18A-NH(2) group having a moderate aortic sinus lesion reduction compared with the control group (-15.1%), while the Ac-nhE18A-NH(2) administered group had increased lesion area (+33.0% vs controls and 36.1% vs Ac-hE18A-NH(2)). Plasma from mice administered Ac-hE18A-NH(2) for six weeks showed a significant reduction in plasma cholesterol and triglyceride levels and increase in paraoxonase-1 (PON-1) activity compared to controls, while Ac-nhE18A-NH(2) caused no change in plasma cholesterol and decreased PON-1 activity. CONCLUSION It is proposed that Ac-hE18A-NH(2) reduced lesion progression in apoE null mice due to its anti-inflammatory and lipoprotein clearing properties, while Ac-nhE18A-NH(2) exhibited pro-atherogenic effects.
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Affiliation(s)
- Gaurav Nayyar
- Atherosclerosis Research Unit and Department of Medicine, Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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Structure and lipid interactions of an anti-inflammatory and anti-atherogenic 10-residue class G(*) apolipoprotein J peptide using solution NMR. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1808:498-507. [PMID: 20970404 DOI: 10.1016/j.bbamem.2010.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 10/06/2010] [Accepted: 10/15/2010] [Indexed: 11/20/2022]
Abstract
The surprising observation that a 10-residue class G(⁎) peptide from apolipoprotein J, [113-122]apoJ, possesses anti-inflammatory and anti-atherogenic properties prompted us to delineate its structural characteristics in the presence of normal and oxidized lipid. Towards this, we have determined high-resolution structure of [113-122]apoJ in solution using nuclear magnetic resonance (NMR) spectroscopy and studied its interaction with lipids, including oxidized lipids, using a number of biophysical methods. Circular dichroism and NMR studies established that in the presence of dodecylphosphocholine (DPC) micelle, this peptide adopts amphipathic α-helical structure. The observed Nuclear Overhauser effects indicate that the amphipathic helical structure of the peptide is stabilized by the N-terminal acetyl and C-terminal amide blocking groups. We used isothermal titration calorimetry to measure binding enthalpy of the peptide with DPC micelle, an oxidized lipid, 1-(palmitoyl)-2-(5-keto-6-octene-dioyl) phosphatidylcholine (KOdiA-PC), and the mixture of these two lipids (5mol% KOdiA-PC in DPC micelle). We find that the peptide binding with DPC micelle is associated with an enthalpy change (-16.75±0.16 Kcal/mol) much larger than that resulting from the binding with KodiA-PC (-3.67±0.13 Kcal/mol). Incorporation of a small amount of KOdiA-PC (5mol%) in DPC micelle also results in the lowering of peptide binding enthalpy (-13.43±0.18 Kcal/mol). These results are consistent with overall negative charge and altered conformational properties of oxidized sn-2 chain of KOdiA-PC. Our results have unambiguously established the amphipathic α-helical structure of [113-122]apoJ peptide in the presence of DPC micelle as well as its ability to bind oxidized lipid. These in vitro results help explain the previously observed anti-inflammatory and anti-atherosclerotic properties of this peptide.
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Abstract
Apolipoprotein A-I (apoA-I) mimetic peptides resemble the physiochemical properties of the helices of apoA-I and show promise for the treatment of atherosclerotic vascular diseases and other chronic inflammatory disorders. These peptides have numerous properties, such as the ability to remodel high-density lipoprotein, sequester oxidized lipids, promote cholesterol efflux, and activate an anti-inflammatory process in macrophages, any or all of which may contribute to their antiatherogenic properties. In murine models, the 4F peptide attenuates early atherosclerosis but seems to require the addition of statins to influence more mature lesions. A recently developed method for the oral delivery of the peptides that protects them from proteolysis will facilitate further research on the mechanism of action of these peptides. This review focuses on the properties of the 4F peptide, although numerous apoA-I mimetics are under investigation and a single "best" peptide that mimics all of the properties of the antiatherogenic protein apoA-I has not been identified.
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Wool GD, Cabana VG, Lukens J, Shaw PX, Binder CJ, Witztum JL, Reardon CA, Getz GS. 4F Peptide reduces nascent atherosclerosis and induces natural antibody production in apolipoprotein E-null mice. FASEB J 2010; 25:290-300. [PMID: 20876212 DOI: 10.1096/fj.10-165670] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Our objective was to contrast the effect of apolipoprotein (apo) A-I mimetic peptides, such as 4F and 4F-Pro-4F (Pro), on nascent and mature atherosclerotic lesions and on levels of antibodies against oxidation-specific epitopes. Chow-fed apoE(-/-) mice were injected intraperitoneally with either the 4F peptide or a tandem helix apoA-I mimetic peptide (Pro) every other day. Mice treated with 4F, but not Pro, for 4 wk starting at 10 wk of age showed a dramatic decrease in atherosclerosis at 2 arterial sites. However, neither peptide was effective in mice treated for 8 wk starting at 20 wk of age; lesions were larger and more mature at this time point. Peptide treatment caused increased production of antibodies against oxidation-specific epitopes, including a disproportionate induction of the IgM natural antibody (NAb) E06/T15 to oxidized phospholipids. In summary, 4F, but not the tandem peptide Pro, effectively inhibited early atherogenesis but was ineffective against more mature lesions. Two different apoA-I mimetic peptides increased titers of natural antibodies against oxidation-specific epitopes.
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Affiliation(s)
- Geoffrey D Wool
- Department of Pathology, University of Chicago, Chicago, Illinois, USA
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Handattu SP, Datta G, Epand RM, Epand RF, Palgunachari MN, Mishra VK, Monroe CE, Keenum TD, Chaddha M, Anantharamaiah GM, Garber DW. Oral administration of L-mR18L, a single domain cationic amphipathic helical peptide, inhibits lesion formation in ApoE null mice. J Lipid Res 2010; 51:3491-9. [PMID: 20841495 DOI: 10.1194/jlr.m006916] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We have shown that Ac-hE18A-NH₂, a dual-domain cationic apolipoprotein-mimetic peptide, reduces plasma cholesterol levels in dyslipidemic mice. Two single-domain cationic peptides based on the lytic class L peptide 18L were developed to test the hypothesis that a single-domain cationic amphipathic peptide can reduce atherosclerosis in apolipoprotein (apo)E null mice when orally administered. To incorporate anti-inflammatory properties, aromatic residues were clustered in the nonpolar face similar to peptide 4F, resulting in modified 18L (m18L). To reduce lytic properties, the Lys residues of 18L were replaced with Arg with the resulting peptide called modified R18L (mR18L). Biophysical studies showed that mR18L had stronger interactions with lipids than did m18L. Peptide mR18L was also more effective than m18L in promoting LDL uptake by HepG2 cells. ApoE null mice received normal chow or chow containing m18L or mR18L for six weeks. A significant reduction in plasma cholesterol and aortic sinus lesion area was seen only in the mR18L group. Plasma from mice administered mR18L, unlike those from the control and m18L groups, did not enhance monocyte adhesion to endothelial cells. Thus oral administration of mR18L reduces plasma cholesterol and lesion formation and inhibits monocyte adhesion.
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Affiliation(s)
- Shaila P Handattu
- Atherosclerosis Research Unit, Department of Medicine, University of Alabama, Birmingham, AL, USA
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D'Souza W, Stonik JA, Murphy A, Demosky SJ, Sethi AA, Moore XL, Chin-Dusting J, Remaley AT, Sviridov D. Structure/function relationships of apolipoprotein a-I mimetic peptides: implications for antiatherogenic activities of high-density lipoprotein. Circ Res 2010; 107:217-27. [PMID: 20508181 DOI: 10.1161/circresaha.110.216507] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
RATIONALE Apolipoprotein (apoA)-I mimetic peptides are a promising type of anti-atherosclerosis therapy, but how the structural features of these peptides relate to the multiple antiatherogenic functions of HDL is poorly understood. OBJECTIVE To establish structure/function relationships of apoA-I mimetic peptides with their antiatherogenic functions. METHODS AND RESULTS Twenty-two bihelical apoA-I mimetic peptides were investigated in vitro for the capacity and specificity of cholesterol efflux, inhibition of inflammatory response of monocytes and endothelial cells, and inhibition of low-density lipoprotein (LDL) oxidation. It was found that mean hydrophobicity, charge, size of hydrophobic face, and angle of the link between the helices are the major factors determining the efficiency and specificity of cholesterol efflux. The peptide with optimal parameters was more effective and specific toward cholesterol efflux than human apoA-I. Charge and size of hydrophobic face were also the major factors affecting antiinflammatory properties, and the presence of cysteine and histidine residues was the main factor determining antioxidant properties. There was no significant correlation between capacities of the peptides to support individual functions; each function had its own optimal set of features. CONCLUSIONS None of the peptides was equally effective in all the antiatherogenic functions tested, suggesting that different functions of HDL may have different mechanisms and different structural requirements. The results do suggest, however, that rationalizing the design of apoA-I mimetic peptides may improve their therapeutic value and may lead to a better understanding of mechanisms of various antiatherogenic functions of HDL.
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Affiliation(s)
- Wilissa D'Souza
- Baker Heart and Diabetes Institute, PO Box 6492, St Kilda Rd, Melbourne 8008, Australia
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Dai L, Datta G, Zhang Z, Gupta H, Patel R, Honavar J, Modi S, Wyss JM, Palgunachari M, Anantharamaiah GM, White CR. The apolipoprotein A-I mimetic peptide 4F prevents defects in vascular function in endotoxemic rats. J Lipid Res 2010; 51:2695-705. [PMID: 20495214 DOI: 10.1194/jlr.m008086] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
High density lipoprotein (HDL) and apolipoprotein A-I (apoA-I) reduce inflammatory responses to lipopolysaccharide (LPS). We tested the hypothesis that the apoA-I mimetic peptide 4F prevents LPS-induced defects in blood pressure and vascular reactivity. Systolic blood pressure (SBP) was measured in rats at baseline and 6 h after injection of LPS (10 mg/kg) or saline vehicle. Subgroups of LPS-treated rats also received 4F (10 mg/kg) or scrambled 4F (Sc-4F). LPS administration reduced SBP by 35% compared with baseline. 4F attenuated the reduction in SBP in LPS-treated rats (17% reduction), while Sc-4F was without effect. Ex vivo studies showed a reduced contractile response to phenylephrine (PE) in aortae of LPS-treated rats (ED(50) = 459 +/- 83 nM) compared with controls (ED(50) = 57 +/- 6 nM). This was associated with nitric oxide synthase 2 (NOS2) upregulation. 4F administration improved vascular contractility (ED(50) = 60 +/- 9 nM), reduced aortic NOS2 protein, normalized plasma levels of NO metabolites, and reduced mortality in LPS-treated rats. These changes were associated with a reduction in plasma endotoxin activity. In vivo administration of (14)C-4F and Bodipy-LPS resulted in their colocalization and retention in the HDL fraction. It is proposed that 4F promotes the localization of LPS to the HDL fraction, resulting in endotoxin neutralization. 4F may thus prevent LPS-induced hemodynamic changes associated with NOS2 induction.
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Affiliation(s)
- Lijun Dai
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
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Abstract
PURPOSE OF REVIEW Synthetic high-density lipoprotein (HDL) and apolipoprotein (apo) A-I mimetic peptides emulate many of the atheroprotective biological functions attributed to HDL and can modify atherosclerotic disease processes. Administration of these agents as HDL replacement or modifying therapy has tremendous potential of providing new treatments for cardiovascular disease. Progress in the understanding of these agents is discussed in this review. RECENT FINDINGS Prospective, observational, and interventional studies have convincingly demonstrated that elevated serum levels of high-density lipoprotein-cholesterol (HDL-C) are associated with reduced risk for coronary heart disease (CHD). Although traditional pharmacological agents have shown modest utility in raising HDL levels and reducing CHD risk, use of HDL and apo A-I mimetics provides novel therapies to not only increase HDL levels, but to also influence HDL functionality. Evidence developed over the last several years has identified a number of pathways affected by synthetic HDL and apoA-I mimetic peptides, including enhancing reverse cholesterol transport and reducing oxidation and inflammation that directly influence the progression and regression of atherosclerotic disease. SUMMARY Clinical trials of relatively short-term synthetic HDL infusion into patients with CHD demonstrate beneficial effects. Use of apo A-I mimetic peptides could potentially overcome some of the limitations associated with use of the intact apo. Studies to establish the most efficacious peptides, optimal dosing regimens, and routes of administration are needed. Use of apo A-I mimetic peptides shows great promise as a therapeutic modality for HDL replacement and enhancing HDL function in treatment of patients with CHD.
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Affiliation(s)
- Armando J Mendez
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, Florida 33136, USA.
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