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Chernov AS, Telegin GB, Minakov AN, Kazakov VA, Rodionov MV, Palikov VA, Kudriaeva AA, Belogurov AA. Synthetic Amphipathic Helical Peptide L-37pA Ameliorates the Development of Acute Respiratory Distress Syndrome (ARDS) and ARDS-Induced Pulmonary Fibrosis in Mice. Int J Mol Sci 2024; 25:8384. [PMID: 39125954 PMCID: PMC11312864 DOI: 10.3390/ijms25158384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Revised: 07/16/2024] [Accepted: 07/23/2024] [Indexed: 08/12/2024] Open
Abstract
In this study, we evaluated the ability of the synthetic amphipathic helical peptide (SAHP), L-37pA, which mediates pathogen recognition and innate immune responses, to treat acute respiratory distress syndrome (ARDS) accompanied by diffuse alveolar damage (DAD) and chronic pulmonary fibrosis (PF). For the modeling of ARDS/DAD, male ICR mice were used. Intrabronchial instillation (IB) of 200 µL of inflammatory agents was performed by an intravenous catheter 20 G into the left lung lobe only, leaving the right lobe unaffected. Intravenous injections (IVs) of L-37pA, dexamethasone (DEX) and physiological saline (saline) were used as therapies for ARDS/DAD. L37pA inhibited the circulating levels of inflammatory cytokines, such as IL-8, TNFα, IL1α, IL4, IL5, IL6, IL9 and IL10, by 75-95%. In all cases, the computed tomography (CT) data indicate that L-37pA reduced lung density faster to -335 ± 23 Hounsfield units (HU) on day 7 than with DEX and saline, to -105 ± 29 HU and -23 ± 11 HU, respectively. The results of functional tests showed that L-37pA treatment 6 h after ARDS/DAD initiation resulted in a more rapid improvement in the physiological respiratory lung by 30-45% functions compared with the comparison drugs. Our data suggest that synthetic amphipathic helical peptide L-37pA blocked a cytokine storm, inhibited acute and chronic pulmonary inflammation, prevented fibrosis development and improved physiological respiratory lung function in the ARDS/DAD mouse model. We concluded that a therapeutic strategy using SAHPs targeting SR-B receptors is a potential novel effective treatment for inflammation-induced ARDS, DAD and lung fibrosis of various etiologies.
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Affiliation(s)
- Aleksandr S. Chernov
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
| | - Georgii B. Telegin
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
| | - Alexey N. Minakov
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
| | - Vitaly A. Kazakov
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
| | - Maksim V. Rodionov
- Medical Radiological Research Center (MRRC) Named after A.F. Tsyb-Branch of the National Medical Radiological Research Center of the Ministry of Health of the Russian Federation, Obninsk 249031, Russia;
| | - Viktor A. Palikov
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
| | - Anna A. Kudriaeva
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
| | - Alexey A. Belogurov
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russia; (G.B.T.); (A.N.M.); (V.A.K.); (V.A.P.); (A.A.K.); (A.A.B.J.)
- Department of Biological Chemistry, Russian University of Medicine of the Ministry of Health of the Russian Federation, Moscow 127473, Russia
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Wang S, Zhang J, Zhou H, Lu YC, Jin X, Luo L, You J. The role of protein corona on nanodrugs for organ-targeting and its prospects of application. J Control Release 2023; 360:15-43. [PMID: 37328008 DOI: 10.1016/j.jconrel.2023.06.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 05/30/2023] [Accepted: 06/11/2023] [Indexed: 06/18/2023]
Abstract
Nowadays, nanodrugs become a hotspot in the high-end medical field. They have the ability to deliver drugs to reach their destination more effectively due to their unique properties and flexible functionalization. However, the fate of nanodrugs in vivo is not the same as those presented in vitro, which indeed influenced their therapeutic efficacy in vivo. When entering the biological organism, nanodrugs will first come into contact with biological fluids and then be covered by some biomacromolecules, especially proteins. The proteins adsorbed on the surface of nanodrugs are known as protein corona (PC), which causes the loss of prospective organ-targeting abilities. Fortunately, the reasonable utilization of PC may determine the organ-targeting efficiency of systemically administered nanodrugs based on the diverse expression of receptors on cells in different organs. In addition, the nanodrugs for local administration targeting diverse lesion sites will also form unique PC, which plays an important role in the therapeutic effect of nanodrugs. This article introduced the formation of PC on the surface of nanodrugs and summarized the recent studies about the roles of diversified proteins adsorbed on nanodrugs and relevant protein for organ-targeting receptor through different administration pathways, which may deepen our understanding of the role that PC played on organ-targeting and improve the therapeutic efficacy of nanodrugs to promote their clinical translation.
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Affiliation(s)
- Sijie Wang
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Junlei Zhang
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Huanli Zhou
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Yi Chao Lu
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Xizhi Jin
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Lihua Luo
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China.
| | - Jian You
- College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China; Zhejiang-California International Nanosystems Institute, Zhejiang University, Hangzhou 310058, PR China; Hangzhou Institute of Innovative Medicine, Zhejiang University, Hangzhou, 310058, Zhejiang, PR China.
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Toyomura T, Watanabe M, Wake H, Nishinaka T, Hatipoglu OF, Takahashi H, Nishibori M, Mori S. Glycolaldehyde-derived advanced glycation end products promote macrophage proliferation via the JAK-STAT signaling pathway. Mol Biol Rep 2023:10.1007/s11033-023-08509-y. [PMID: 37227674 DOI: 10.1007/s11033-023-08509-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 05/04/2023] [Indexed: 05/26/2023]
Abstract
BACKGROUND Advanced glycation end products (AGEs) are heterogeneous proinflammatory molecules produced by a non-enzymatic glycation reaction between reducing sugars (and their metabolites) and biomolecules with amino groups, such as proteins. Although increases in and the accumulation of AGEs have been implicated in the onset and exacerbation of lifestyle- or age-related diseases, including diabetes, their physiological functions have not yet been elucidated in detail. METHODS AND RESULTS The present study investigated the cellular responses of the macrophage cell line RAW264.7 stimulated by glycolaldehyde-derived AGEs (Glycol-AGEs) known as representative toxic AGEs. The results obtained showed that Glycol-AGEs significantly promoted the proliferation of RAW264.7 cells at a low concentration range (1-10 µg/mL) in a concentration-dependent manner. On the other hand, neither TNF-α production nor cytotoxicity were induced by the same concentrations of Glycol-AGEs. The increases observed in cell proliferation by low concentrations of Glycol-AGEs were also detected in receptor triple knockout (RAGE-TLR4-TLR2 KO) cells as well as in wild-type cells. Increases in cell proliferation were not affected by various kinase inhibitors, including MAP kinase inhibitors, but were significantly suppressed by JAK2 and STAT5 inhibitors. In addition, the expression of some cell cycle-related genes was up-regulated by the stimulation with Glycol-AGEs. CONCLUSIONS These results suggest a novel physiological role for AGEs in the promotion of cell proliferation via the JAK-STAT pathway.
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Affiliation(s)
- Takao Toyomura
- Department of Pharmacology, School of Pharmacy, Shujitsu University, Nishigawara, Naka-ku, Okayama, 703-8516, Japan
| | - Masahiro Watanabe
- Department of Pharmacology, School of Pharmacy, Shujitsu University, Nishigawara, Naka-ku, Okayama, 703-8516, Japan
| | - Hidenori Wake
- Department of Pharmacology, Faculty of Medicine, Kindai University, Osaka-Sayama, 589-8511, Japan
| | - Takashi Nishinaka
- Department of Pharmacology, Faculty of Medicine, Kindai University, Osaka-Sayama, 589-8511, Japan
| | - Omer Faruk Hatipoglu
- Department of Pharmacology, Faculty of Medicine, Kindai University, Osaka-Sayama, 589-8511, Japan
| | - Hideo Takahashi
- Department of Pharmacology, Faculty of Medicine, Kindai University, Osaka-Sayama, 589-8511, Japan
| | - Masahiro Nishibori
- Department of Pharmacology, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Okayama, 700-8558, Japan
| | - Shuji Mori
- Department of Pharmacology, School of Pharmacy, Shujitsu University, Nishigawara, Naka-ku, Okayama, 703-8516, Japan.
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Gudgeon J, Marín-Rubio JL, Trost M. The role of macrophage scavenger receptor 1 (MSR1) in inflammatory disorders and cancer. Front Immunol 2022; 13:1012002. [PMID: 36325338 PMCID: PMC9618966 DOI: 10.3389/fimmu.2022.1012002] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 09/28/2022] [Indexed: 08/27/2023] Open
Abstract
Macrophage scavenger receptor 1 (MSR1), also named CD204, holds key inflammatory roles in multiple pathophysiologic processes. Present primarily on the surface of various types of macrophage, this receptor variably affects processes such as atherosclerosis, innate and adaptive immunity, lung and liver disease, and more recently, cancer. As highlighted throughout this review, the role of MSR1 is often dichotomous, being either host protective or detrimental to the pathogenesis of disease. We will discuss the role of MSR1 in health and disease with a focus on the molecular mechanisms influencing MSR1 expression, how altered expression affects disease process and macrophage function, the limited cell signalling pathways discovered thus far, the emerging role of MSR1 in tumour associated macrophages as well as the therapeutic potential of targeting MSR1.
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Affiliation(s)
| | - José Luis Marín-Rubio
- Laboratory for Biological Mass Spectrometry, Biosciences Institute, Newcastle University, Newcastle-upon-Tyne, United Kingdom
| | - Matthias Trost
- Laboratory for Biological Mass Spectrometry, Biosciences Institute, Newcastle University, Newcastle-upon-Tyne, United Kingdom
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Miron J, Picard C, Labonté A, Auld D, Poirier J. MSR1 and NEP Are Correlated with Alzheimer's Disease Amyloid Pathology and Apolipoprotein Alterations. J Alzheimers Dis 2022; 86:283-296. [PMID: 35034907 DOI: 10.3233/jad-215410] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND In mouse models of amyloidosis, macrophage receptor 1 (MSR1) and neprilysin (NEP) have been shown to interact to reduce amyloid burden in the brain. OBJECTIVE The purpose of this study is to analyze these two gene products in combination with apolipoproteins and Aβ1-42 in the cerebrospinal fluid (CSF) and plasma of individuals at different stages of Alzheimer's disease (AD), as well as in autopsied brain samples from ROSMAP (Religious Orders Study and Memory and Aging Project). METHODS CSF/plasma levels of MSR1 and NEP were measured using the sensitive primer extension assay technology. CSF Aβ1-42 was assessed with ELISA, while CSF ApoE and ApoJ were measured with the Luminex's multiplex technology. Brain MSR1, APOE, and CLU (APOJ) mRNA levels were measured with RNA-Seq and contrasted to amyloid plaques pathology using CERAD staging. RESULTS While plasma and CSF MSR1 levels are significantly correlated, this correlation was not observed for NEP. In addition to be highly correlated to one another, CSF levels of both MSR1 and NEP are strongly correlated with AD status and CSF Aβ1-42, ApoE, and ApoJ levels. In the cortical tissues of subjects from ROSMAP, MSR1 mRNA levels are correlated with CLU mRNA levels and the CERAD scores but not with APOE mRNA levels. CONCLUSION The discrepancies observed between CSF/plasma levels of MSR1 and NEP with CSF Aβ1-42 and ApoE concentrations can be explained by many factors, such as the disease stage or the involvement of the blood-brain barrier breakdown that leads to the infiltration of peripheral monocytes or macrophages.
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Affiliation(s)
- Justin Miron
- Douglas Hospital Research Centre, Montréal, QC, Canada.,Centre for the Studies on the Prevention of Alzheimer's Disease, Montréal, QC, Canada.,McGill University, Montréal, QC, Canada
| | - Cynthia Picard
- Douglas Hospital Research Centre, Montréal, QC, Canada.,Centre for the Studies on the Prevention of Alzheimer's Disease, Montréal, QC, Canada
| | - Anne Labonté
- Douglas Hospital Research Centre, Montréal, QC, Canada.,Centre for the Studies on the Prevention of Alzheimer's Disease, Montréal, QC, Canada
| | | | - Judes Poirier
- Douglas Hospital Research Centre, Montréal, QC, Canada.,Centre for the Studies on the Prevention of Alzheimer's Disease, Montréal, QC, Canada.,McGill University, Montréal, QC, Canada
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Wang X, Zhang W. The Janus of Protein Corona on nanoparticles for tumor targeting, immunotherapy and diagnosis. J Control Release 2022; 345:832-850. [PMID: 35367478 DOI: 10.1016/j.jconrel.2022.03.056] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 12/11/2022]
Abstract
The therapeutics based on nanoparticles (NPs) are considered as the promising strategy for tumor detection and treatment. However, one of the most challenges is the adsorption of biomolecules on NPs after their exposition to biological medium, leading unpredictable in vivo behaviors. The interactions caused by protein corona (PC) will influence the biological fate of NPs in either negative or positive ways, including (i) blood circulation, accumulation and penetration of NPs at targeting sites, and further cellular uptake in tumor targeting delivery; (ii) interactions between NPs and receptors on immune cells for immunotherapy. Besides, PC on NPs could be utilized as new biomarker in tumor diagnosis by identifying the minor change of protein concentration led by tumor growth and invasion in blood. Herein, the mechanisms of these PC-mediated effects will be introduced. Moreover, the recent advances about the strategies will be reviewed to reduce negative effects caused by PC and/or utilize positive effects of PC on tumor targeting, immunotherapy and diagnosis, aiming to provide a reasonable perspective to recognize PC with their applications.
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Affiliation(s)
- Xiaobo Wang
- School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Wenli Zhang
- School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China.
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Receptor Mediated Effects of Advanced Glycation End Products (AGEs) on Innate and Adaptative Immunity: Relevance for Food Allergy. Nutrients 2022; 14:nu14020371. [PMID: 35057553 PMCID: PMC8778532 DOI: 10.3390/nu14020371] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 01/07/2022] [Accepted: 01/13/2022] [Indexed: 12/11/2022] Open
Abstract
As of late, evidence has been emerging that the Maillard reaction (MR, also referred to as glycation) affects the structure and function of food proteins. MR induces the conformational and chemical modification of food proteins, not only on the level of IgG/IgE recognition, but also by increasing the interaction and recognition of these modified proteins by antigen-presenting cells (APCs). This affects their biological properties, including digestibility, bioavailability, immunogenicity, and ultimately their allergenicity. APCs possess various receptors that recognize glycation structures, which include receptor for advanced glycation end products (RAGE), scavenger receptors (SRs), galectin-3 and CD36. Through these receptors, glycation structures may influence the recognition, uptake and antigen-processing of food allergens by dendritic cells (DCs) and monocytes. This may lead to enhanced cytokine production and maturation of DCs, and may also induce adaptive immune responses to the antigens/allergens as a result of antigen uptake, processing and presentation to T cells. Here, we aim to review the current literature on the immunogenicity of AGEs originating from food (exogenous or dietary AGEs) in relation to AGEs that are formed within the body (endogenous AGEs), their interactions with receptors present on immune cells, and their effects on the activation of the innate as well as the adaptive immune system. Finally, we review the clinical relevance of AGEs in food allergies.
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Jiang F, Chen Z, Hu J, Liu Q. Serum Soluble Scavenger Receptor A Levels are Associated with Delayed Cerebral Ischemia and Poor Clinical Outcome After Aneurysmal Subarachnoid Hemorrhage: A Prospective Observational Study. Neuropsychiatr Dis Treat 2022; 18:2529-2541. [PMID: 36349344 PMCID: PMC9637348 DOI: 10.2147/ndt.s387487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 10/20/2022] [Indexed: 01/24/2023] Open
Abstract
OBJECTIVE Scavenger receptor A (SRA), a pattern recognition molecule, is implicated in immune response after acute brain injury. We strived to identify serum soluble SRA (sSRA) as a potential biomarker of prognosis after aneurysmal subarachnoid hemorrhage (aSAH). METHODS In this prospective observational study, we quantified serum sSRA levels of 131 aSAH patients and 131 healthy controls. A poor outcome was defined as extended Glasgow outcome scale (GOSE) scores of 1-4 at 90 days after injury. Relations of serum sSRA levels to severity, delayed cerebral ischemia (DCI) and poor outcome were assessed using multivariate analysis. Predictive efficiency was determined via area under receiver operating characteristic curve (AUC). RESULTS Serum sSRA levels were markedly higher in aSAH patients than in controls (median, 2.9 ng/mL versus 1.0 ng/mL; P < 0.001). Serum sSRA levels were independently correlated with Hunt-Hess scores (beta, 0.569; 95% confidence interval (CI), 0.244-0.894; P = 0.001), modified Fisher scores (beta, 0.664; 95% CI, 0.254-1.074; P = 0.002) and 90-day GOSE scores (beta, -0.275; 95% CI, -0.440-0.110; P = 0.005). Serum sSRA levels independently predicted DCI (odds ratio, 1.305; 95% CI, 1.012-1.687; P = 0.040) and a poor outcome (odds ratio, 2.444; 95% CI, 1.264-4.726; P = 0.008), as well as showed significant accuracy for the discrimination of DCI (AUC, 0.753; 95% CI, 0.649-0.857; P < 0.001) and a poor outcome (AUC, 0.800; 95% CI, 0.721-0.880; P < 0.001). Its combination with Hunt-Hess scores and modified Fisher scores displayed significantly improved AUCs for predicting DCI and poor outcome, as compared to any of them (all P < 0.05). CONCLUSION There is a significant elevation of serum sSRA levels after aSAH, which in close correlation with illness severity, are independently associated with DCI and poor clinical outcome after aSAH. Hypothetically, SRA may regulate immune response in acute brain injury after aSAH and serum sSRA is presumed to be a potential prognostic biomarker of aSAH.
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Affiliation(s)
- Feng Jiang
- Department of Neurosurgery, Ningbo Hangzhou Bay Hospital, Ningbo, 315336, People's Republic of China.,Department of Neurosurgery, Ningbo Branch, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Ningbo, 315336, People's Republic of China
| | - Zhicheng Chen
- Department of Neurosurgery, Ningbo Hangzhou Bay Hospital, Ningbo, 315336, People's Republic of China.,Department of Neurosurgery, Ningbo Branch, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Ningbo, 315336, People's Republic of China
| | - Jiemiao Hu
- Department of Neurosurgery, Ningbo Hangzhou Bay Hospital, Ningbo, 315336, People's Republic of China.,Department of Neurosurgery, Ningbo Branch, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Ningbo, 315336, People's Republic of China
| | - Qianzhi Liu
- Department of Neurosurgery, Ningbo Hangzhou Bay Hospital, Ningbo, 315336, People's Republic of China.,Department of Neurosurgery, Ningbo Branch, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Ningbo, 315336, People's Republic of China
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Gao B, Xu J, Zhou J, Zhang H, Yang R, Wang H, Huang J, Yan F, Luo Y. Multifunctional pathology-mapping theranostic nanoplatforms for US/MR imaging and ultrasound therapy of atherosclerosis. NANOSCALE 2021; 13:8623-8638. [PMID: 33929480 DOI: 10.1039/d1nr01096d] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Atherosclerotic thrombosis is the leading cause of most life-threatening cardiovascular diseases (CVDs), particularly as a result of rupture or erosion of vulnerable plaques. Rupture or erosion-prone plaques are quite different in cellular composition and immunopathology, requiring different treatment strategies. The current imaging technology cannot distinguish the types of vulnerable plaques, and thus empirical treatment is still applied to all without a tailored and precise treatment. Herein, we propose a novel strategy called "Multifunctional Pathology-mapping Theranostic Nanoplatform (MPmTN)" for the tailored treatment of plaques based on the pathological classification. MPmTNs are made up of poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs), containing contrast imaging materials Fe3O4 and perfluoropentane (PFP), and coated with specific plaque-targeted peptides PP1 and cyclic RGD. The PFP encapsulated inside the MPmTN can undergo a phase change from nanodroplets to gas microbubbles under therapeutic ultrasound (TUS) exposure. The acoustic and biological effects induced by TUS and disruption of microbubbles may further promote therapeutic effects. Hypothetically, MPmTN NPs can target the rupture-prone plaque via the binding of PP1 to class A scavenger receptors (SR-A) on macrophages, induce the apoptosis due to TUS exposure and thus reduce the chronic soakage of inflammatory cells. The MPmTN NPs can also target the erosion-prone plaque through the binding of cRGD to glycoprotein (GP) IIb/IIIa on activated platelets and promote platelet disaggregation under TUS exposure. Therefore, MPmTNs may work as a multifunctional pathology-mapping therapeutic agent. Our in vitro results show that the MPmTN with PP1 and cRGD peptides had a high binding affinity both for activated macrophages and blood clots. Under TUS exposure, the MPmTN could effectively induce macrophage apoptosis, destroy thrombus and exhibit good imaging properties for ultrasound (US) and MRI. In apoE-/- mice, MPmTNs can selectively accumulate at the plaque site and reduce the T2-weighted signal. The apoptosis of macrophages and disaggregation of activated platelets on the plaques were also confirmed in vivo. In summary, this study provides a potential strategy for a tailored treatment of vulnerable plaques based on their pathological nature and a multimodal imaging tool for the risk stratification and assessment of therapeutic efficacy.
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Affiliation(s)
- Binyang Gao
- Department of Ultrasound, Laboratory of Ultrasound Imaging and Drug, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China.
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Corachán A, Pellicer N, Pellicer A, Ferrero H. Novel therapeutic targets to improve IVF outcomes in endometriosis patients: a review and future prospects. Hum Reprod Update 2021; 27:923-972. [PMID: 33930149 DOI: 10.1093/humupd/dmab014] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 03/09/2021] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Patients with endometriosis often experience infertility and have poor IVF outcomes, with low fertilization and pregnancy rates. Although many theories have tried to explain the mechanisms underlying infertility in these patients, none of them is conclusive. OBJECTIVE AND RATIONALE In this review, we discuss the pathologic mechanisms through which endometriosis likely leads to infertility along with the therapeutic options used to date to treat endometriosis-related infertility and, thereby, to improve IVF outcomes in patients with endometriosis. SEARCH METHODS We performed a comprehensive literature search of clinical outcomes in endometriosis and the molecular mechanisms contributing to oocyte quality using the PubMed database to identify human and animal studies published from 1992 until September 2020. In total, 123 manuscripts were included. OUTCOMES While some theories propose that endometriosis patients may have fertility problems as a result of decreased endometrial receptivity, others reinforce the idea that infertility could be associated with oocyte alterations and lower implantation rates. Single-cell RNA sequencing of oocytes from patients with endometriosis has identified dysregulated mechanisms involved in steroid metabolism and biosynthesis, response to oxidative stress and cell cycle regulation. Dysregulation of these mechanisms could result in the poor IVF outcomes observed in patients with endometriosis. Further, impaired steroidogenesis may directly affect oocyte and embryo quality. Increased oxidative stress in patients with endometriosis also has a detrimental effect on the follicular microenvironment, inducing cell cycle dysregulation in oocytes, poor oocyte quality, and infertility. Moreover, granulosa cells in the context of endometriosis undergo increased apoptosis and have an altered cell cycle that could adversely affect folliculogenesis, oocyte and embryo quality, and IVF outcomes. Endometriosis is also associated with inflammatory damage and impaired angiogenesis, which could be directly correlated with poor IVF outcomes. While therapeutic options using GnRH analogues, progestins and aromatase inhibitors do not improve endometriosis-related infertility, anti-inflammatory agents and antioxidant supplementation could improve oocyte quality as well as implantation and clinical pregnancy rates in patients with endometriosis. WIDER IMPLICATIONS Endometriosis is a heterogeneous disease whose pathogenesis is complex and could affect fertility by altering a collection of molecular mechanisms in oocytes. Thus, a single model is not sufficient to describe endometriosis-related infertility. Dysregulation of steroidogenesis, oxidative stress, cell cycle progression, inflammation and angiogenesis in the follicular environment and oocytes in individuals with endometriosis are all possible contributors to endometriosis-related infertility. Therefore, treatments targeting these mechanisms could be therapeutic alternatives to improve IVF outcomes for these patients.
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Affiliation(s)
- Ana Corachán
- Fundación IVI, Instituto de Investigación Sanitaria La Fe, Medicina Reproductiva, Valencia, Spain.,Departamento de Pediatría, Obstetricia y Ginecología, Universidad de Valencia, Valencia, Spain
| | - Nuria Pellicer
- Hospital Universitario y Politécnico La Fe, Obstetricia y Ginecología, Valencia, Spain
| | - Antonio Pellicer
- Fundación IVI, Instituto de Investigación Sanitaria La Fe, Medicina Reproductiva, Valencia, Spain.,IVIRMA Clinics, Rome, Italy
| | - Hortensia Ferrero
- Fundación IVI, Instituto de Investigación Sanitaria La Fe, Medicina Reproductiva, Valencia, Spain
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Lateral diffusion of CD14 and TLR2 in macrophage plasma membrane assessed by raster image correlation spectroscopy and single particle tracking. Sci Rep 2020; 10:19375. [PMID: 33168941 PMCID: PMC7652837 DOI: 10.1038/s41598-020-76272-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/23/2020] [Indexed: 01/02/2023] Open
Abstract
The diffusion of membrane receptors is central to many biological processes, such as signal transduction, molecule translocation, and ion transport, among others; consequently, several advanced fluorescence microscopy techniques have been developed to measure membrane receptor mobility within live cells. The membrane-anchored receptor cluster of differentiation 14 (CD14) and the transmembrane toll-like receptor 2 (TLR2) are important receptors in the plasma membrane of macrophages that activate the intracellular signaling cascade in response to pathogenic stimuli. The aim of the present work was to compare the diffusion coefficients of CD14 and TLR2 on the apical and basal membranes of macrophages using two fluorescence-based methods: raster image correlation spectroscopy (RICS) and single particle tracking (SPT). In the basal membrane, the diffusion coefficients obtained from SPT and RICS were found to be comparable and revealed significantly faster diffusion of CD14 compared with TLR2. In addition, RICS showed that the diffusion of both receptors was significantly faster in the apical membrane than in the basal membrane, suggesting diffusion hindrance by the adhesion of the cells to the substrate. This finding highlights the importance of selecting the appropriate membrane (i.e., basal or apical) and corresponding method when measuring receptor diffusion in live cells. Accurately knowing the diffusion coefficient of two macrophage receptors involved in the response to pathogen insults will facilitate the study of changes that occur in signaling in these cells as a result of aging and disease.
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12
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Ferrero H, Corachán A, Aguilar A, Quiñonero A, Carbajo-García MC, Alamá P, Tejera A, Taboas E, Muñoz E, Pellicer A, Domínguez F. Single-cell RNA sequencing of oocytes from ovarian endometriosis patients reveals a differential transcriptomic profile associated with lower quality. Hum Reprod 2020; 34:1302-1312. [PMID: 31211846 DOI: 10.1093/humrep/dez053] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/30/2019] [Indexed: 12/20/2022] Open
Abstract
STUDY QUESTION Do oocytes from women with ovarian endometriosis (OE) have a different transcriptomic profile than those from healthy women? SUMMARY ANSWER Oocytes from endometriosis patients, independently of whether they came from the affected ovary, exhibited a differential transcriptomic profile compared to oocytes from healthy egg donors. WHAT IS KNOWN ALREADY Studies of endometriosis have sought to determine whether OE affects oocyte quality. While many reports indicate that oocytes recovered from endometriotic ovaries may be affected by the disease, other studies have found no significant differences among oocyte/embryo quality and fertilization, implantation and pregnancy rates in women with endometriosis. STUDY DESIGN, SIZE, DURATION This prospective study compared metaphase II (MII) oocytes (n = 16) from endometriosis patients (n = 7) to oocytes (n = 16) from healthy egg donors (n = 5) by single-cell RNA sequencing (scRNA-seq). Participants were recruited between December 2016 and February 2018 at IVI-RMA Valencia and Vigo clinics. PARTICIPANTS/MATERIALS, SETTING, METHODS Human MII oocytes were collected from healthy egg donors and OE patients aged 18-34 years, with a body mass index of <30 and >6 pre-antral follicles. RNA was extracted, cDNA was generated and libraries were constructed and sequenced. scRNA-seq data libraries were processed and statistically analysed. Selected genes were validated by quantitative real-time PCR. MAIN RESULTS AND THE ROLE OF CHANCE Our scRNA-seq results revealed an effect of endometriosis on global transcriptome behaviour in oocytes from endometriotic ovaries. The highest number of differentially expressed genes (DEGs) was found when oocytes from women with OE were compared to oocytes from healthy donors [520 DEGs (394 upregulated and 126 downregulated)], independently of whether oocytes came from an affected or unaffected ovary. Among the top 20 significant DEGs in this comparison, most were upregulated, including APOE, DUSP1, G0S2, H2AFZ, ID4, MGST1 and WEE1. PXK was the only downregulated gene. Subsequently, functional analysis showed 31 enriched functions deregulated in endometriosis patients (Benjamini P < 0.1), being 16 significant enriched functions considering Benjamini P < 0.05, which involved in biological processes and molecular functions, such as steroid metabolism, response to oxidative stress and cell growth regulation. In addition, our functional analysis showed enrichment for mitochondria, which are an important cellular component in oocyte development. Other functions important in embryo development, such as angiogenesis and methylation, were also significantly enriched. LARGE SCALE DATA All raw sequencing data are submitted in Gene Expression Omnibus (GEO) under accession number (PRJNA514416). LIMITATIONS, REASONS FOR CAUTION This study was restricted only to OE and thereby other anatomical entities, such as peritoneal and deep infiltrating endometriosis, were not considered. This is a descriptive study with a limited number of samples reflecting the difficulty to recruit human oocytes, especially from women with endometriosis. WIDER IMPLICATIONS OF THE FINDINGS This study suggests that OE exhibits a global transcriptomic effect on oocytes of patients in OE, independently if they come from an affected or unaffected ovary and alters key biological processes and molecular functions related to steroid metabolism, response to oxidative stress and cell growth regulation, which reduce oocyte quality. STUDY FUNDING/COMPETING INTEREST(S) This research was supported by IVI Foundation, the Spanish Ministry of Economy and Competitiveness through the Miguel Servet programme (CPII018/00002 to F.D.), the Sara Borrell Program (CD15/00057 to H.F.) and the VALi+d Programe (Generalitat Valenciana); ACIF/2016/444 to A.C.). The authors have no conflicts of interest to declare. TRIAL REGISTRATION NUMBER None.
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Affiliation(s)
- Hortensia Ferrero
- Fundación Instituto Valenciano de Infertilidad, Instituto Universitario IVI, Valencia, Spain.,INCLIVA Biomedical Research Institute, Valencia, Spain
| | - Ana Corachán
- Fundación Instituto Valenciano de Infertilidad, Instituto Universitario IVI, Valencia, Spain.,Department of Pediatrics, Obstetrics and Gynecology, University of Valencia, Valencia, Spain
| | - Alejandra Aguilar
- Instituto Valenciano de Infertilidad-Reproductive Medicine Associates (IVI-RMA), London, UK
| | - Alicia Quiñonero
- Fundación Instituto Valenciano de Infertilidad, Instituto Universitario IVI, Valencia, Spain
| | | | - Pilar Alamá
- Instituto Valenciano de Infertilidad-Reproductive Medicine Associates (IVI-RMA) Valencia, Valencia, Spain
| | - Alberto Tejera
- Instituto Valenciano de Infertilidad-Reproductive Medicine Associates (IVI-RMA) Valencia, Valencia, Spain
| | - Esther Taboas
- Instituto Valenciano de Infertilidad-Reproductive Medicine Associates (IVI-RMA) Valencia, Vigo, Spain
| | - Elkin Muñoz
- Instituto Valenciano de Infertilidad-Reproductive Medicine Associates (IVI-RMA) Valencia, Vigo, Spain
| | - Antonio Pellicer
- Fundación Instituto Valenciano de Infertilidad, Instituto Universitario IVI, Valencia, Spain.,Department of Pediatrics, Obstetrics and Gynecology, University of Valencia, Valencia, Spain
| | - Francisco Domínguez
- Fundación Instituto Valenciano de Infertilidad, Instituto Universitario IVI, Valencia, Spain.,Health Research Institute la Fe, Valencia, Spain
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13
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Gordon S, Plüddemann A, Mukhopadhyay S. Plasma membrane receptors of tissue macrophages: functions and role in pathology. J Pathol 2020; 250:656-666. [PMID: 32086805 DOI: 10.1002/path.5404] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 02/18/2020] [Indexed: 12/11/2022]
Abstract
The cells of the mononuclear phagocyte system (MPS) constitute a dispersed organ, which is distributed throughout the body. Macrophages in different tissues display distinctive mosaic phenotypes as resident and recruited cells of embryonic and bone marrow origin, respectively. They help to maintain homeostasis during development and throughout adult life, yet contribute to the pathogenesis of many disease processes, including inflammation, innate and adaptive immunity, metabolic disorders, and cancer. Heterogeneous tissue macrophage populations display a wide variety of surface molecules to recognise and respond to host, microbial, and exogenous ligands in their environment; their receptors mediate the uptake and destruction of effete and dying host cells and pathogens, as well as contribute trophic and secretory functions within every organ in the body. Apart from local cellular interactions, macrophage surface molecules and products serve to mobilise and coordinate systemic humoral and cellular responses. Their use as antigen markers in pathogenesis and as potential drug targets has lagged in clinical pathology and human immunotherapy. In this review, we summarise the properties of selected surface molecules expressed on macrophages in different tissues and disease processes, to provide a functional basis for diagnosis, further research, and treatment. © 2020 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Siamon Gordon
- College of Medicine, Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan City, Taiwan.,Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | - Annette Plüddemann
- Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
| | - Subhankar Mukhopadhyay
- Peter Gorer Department of Immunobiology, Medical Research Council Centre for Transplantation, King's College London, London, UK
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14
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Martins C, Chauhan VM, Selo AA, Al-Natour M, Aylott JW, Sarmento B. Modelling protein therapeutic co-formulation and co-delivery with PLGA nanoparticles continuously manufactured by microfluidics. REACT CHEM ENG 2020. [DOI: 10.1039/c9re00395a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Formulating protein therapeutics into nanoparticles (NPs) of poly(lactic-co-glycolic acid) (PLGA) provides key features such as protection against clearance, sustained release and less side effects by possible attachment of targeting ligands.
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Affiliation(s)
- Cláudia Martins
- i3S – Instituto de Investigação e Inovação em Saúde
- Universidade do Porto
- 4200-393 Porto
- Portugal
- INEB – Instituto de Engenharia Biomédica
| | - Veeren M. Chauhan
- School of Pharmacy
- Boots Science Building
- University of Nottingham
- NG7 2RD Nottingham
- UK
| | - Amjad A. Selo
- School of Pharmacy
- Boots Science Building
- University of Nottingham
- NG7 2RD Nottingham
- UK
| | - Mohammad Al-Natour
- School of Pharmacy
- Boots Science Building
- University of Nottingham
- NG7 2RD Nottingham
- UK
| | - Jonathan W. Aylott
- School of Pharmacy
- Boots Science Building
- University of Nottingham
- NG7 2RD Nottingham
- UK
| | - Bruno Sarmento
- i3S – Instituto de Investigação e Inovação em Saúde
- Universidade do Porto
- 4200-393 Porto
- Portugal
- INEB – Instituto de Engenharia Biomédica
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15
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Post GR, Yuan Y, Holthoff ER, Quick CM, Post SR. Identification of a novel monocytic phenotype in Classic Hodgkin Lymphoma tumor microenvironment. PLoS One 2019; 14:e0224621. [PMID: 31714922 PMCID: PMC6850552 DOI: 10.1371/journal.pone.0224621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 10/17/2019] [Indexed: 01/07/2023] Open
Abstract
Classic Hodgkin lymphoma (CHL) characteristically shows few malignant cells in a microenvironment comprised of mixed inflammatory cells. Although CHL is associated with a high cure rate, recent studies have associated poor prognosis with absolute monocyte count in peripheral blood and increased monocyte/macrophages in involved lymph nodes. Thus, the role of monocytic infiltration and macrophage differentiation in the tumor microenvironment of CHL may be more relevant than absolute macrophage numbers to defining prognosis in CHL patients and potentially have therapeutic implications. Most studies identify tumor-associated macrophages (TAMs) using markers (e.g., CD68) expressed by macrophages and other mononuclear phagocytes, such as monocytes. In contrast, Class A Scavenger Receptor (SR-A/CD204) is expressed by tissue macrophages but not monocytic precursors. In this study, we examined SR-A expression in CHL (n = 43), and compared its expression with that of other macrophage markers. We confirmed a high prevalence of mononuclear cells that stained with CD68, CD163, and CD14 in CHL lymph nodes. However, SR-A protein expression determined by immunohistochemistry was limited to macrophages localized in sclerotic bands characteristic of nodular sclerosis CHL. In contrast, SR-A protein was readily detectable in lymph nodes with metastatic tumor, extra-nodal CHL, T cell/histiocyte-rich large B cell lymphoma, and resident macrophages in non-malignant tissues, including spleen, lymph node, liver and lung. The results of SR-A protein expression paralleled the expression of SR-A mRNA determined by quantitative RT-PCR. These data provide evidence that tumor-infiltrating monocyte/macrophages in CHL have a unique phenotype that likely depends on the microenvironment of nodal CHL.
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Affiliation(s)
- Ginell R. Post
- Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Youzhong Yuan
- Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Emily R. Holthoff
- Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Charles M. Quick
- Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Steven R. Post
- Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
- * E-mail:
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16
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Gordon S, Plüddemann A. The Mononuclear Phagocytic System. Generation of Diversity. Front Immunol 2019; 10:1893. [PMID: 31447860 PMCID: PMC6696592 DOI: 10.3389/fimmu.2019.01893] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 07/26/2019] [Indexed: 01/08/2023] Open
Abstract
We are living through an unprecedented accumulation of data on gene expression by macrophages, reflecting their origin, distribution, and localization within all organs of the body. While the extensive heterogeneity of the cells of the mononuclear phagocyte system is evident, the functional significance of their diversity remains incomplete, nor is the mechanism of diversification understood. In this essay we review some of the implications of what we know, and draw attention to issues to be clarified in further research, taking advantage of the powerful genetic, cellular, and molecular tools now available. Our thesis is that macrophage specialization and functions go far beyond immunobiology, while remaining an essential contributor to innate as well as adaptive immunity.
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Affiliation(s)
- Siamon Gordon
- College of Medicine, Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan City, Taiwan.,Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Annette Plüddemann
- Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom
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17
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Patten DA, Shetty S. More Than Just a Removal Service: Scavenger Receptors in Leukocyte Trafficking. Front Immunol 2018; 9:2904. [PMID: 30631321 PMCID: PMC6315190 DOI: 10.3389/fimmu.2018.02904] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 11/27/2018] [Indexed: 12/15/2022] Open
Abstract
Scavenger receptors are a highly diverse superfamily of proteins which are grouped by their inherent ability to bind and internalize a wide array of structurally diverse ligands which can be either endogenous or exogenous in nature. Consequently, scavenger receptors are known to play important roles in host homeostasis, with common endogenous ligands including apoptotic cells, and modified low density lipoproteins (LDLs); additionally, scavenger receptors are key regulators of inflammatory diseases, such as atherosclerosis. Also, as a consequence of their affinity for a wide range of microbial products, their role in innate immunity is also being increasingly studied. However, in this review, a secondary function of a number of endothelial-expressed scavenger receptors is discussed. There is increasing evidence that some endothelial-expressed scavenger receptors are able to directly bind leukocyte-expressed ligands and subsequently act as adhesion molecules in the trafficking of leukocytes in lymphatic and vascular tissues. Here, we cover the current literature on this alternative role for endothelial-expressed scavenger receptors and also speculate on their therapeutic potential.
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Affiliation(s)
- Daniel A Patten
- National Institute for Health Research Birmingham Liver Biomedical Research Unit and Centre for Liver and Gastrointestinal Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
| | - Shishir Shetty
- National Institute for Health Research Birmingham Liver Biomedical Research Unit and Centre for Liver and Gastrointestinal Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
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18
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Hyun H, Park J, Willis K, Park JE, Lyle LT, Lee W, Yeo Y. Surface modification of polymer nanoparticles with native albumin for enhancing drug delivery to solid tumors. Biomaterials 2018; 180:206-224. [PMID: 30048910 PMCID: PMC6076859 DOI: 10.1016/j.biomaterials.2018.07.024] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 07/11/2018] [Accepted: 07/12/2018] [Indexed: 01/09/2023]
Abstract
Albumin is a promising surface modifier of nanoparticulate drug delivery systems. Serving as a dysopsonin, albumin can protect circulating nanoparticles (NPs) from the recognition and clearance by the mononuclear phagocytic system (MPS). Albumin may also help transport the NPs to solid tumors based on the increased consumption by cancer cells and interactions with the tumor microenvironment. Several studies have explored the benefits of surface-bound albumin to enhance NP delivery to tumors. However, it remains unknown how the surface modification process affects the conformation of albumin and the performance of the albumin-modified NPs. We use three different surface modification methods including two prevalent approaches (physisorption and interfacial embedding) and a new method based on dopamine polymerization to modify the surface of poly(lactic-co-glycolic acid) NPs with albumin and compare the extent of albumin binding, conformation of the surface-bound albumin, and biological performances of the albumin-coated NPs. We find that the dopamine polymerization method preserves the albumin structure, forming a surface layer that facilitates NP transport and drug delivery into tumors via the interaction with albumin-binding proteins. In contrast, the interfacial embedding method creates NPs with denatured albumin that offers no particular benefit to the interaction with cancer cells but rather promotes the MPS uptake via direct and indirect interactions with scavenger receptor A. This study demonstrates that the surface-bound albumin can bring distinct effects according to the way they interact with NP surface and thus needs to be controlled in order to achieve favorable therapeutic outcomes.
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Affiliation(s)
- Hyesun Hyun
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN, 47907, USA
| | - Joonyoung Park
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN, 47907, USA
| | - Kiela Willis
- School of Chemical Engineering, Purdue University, 480 West Stadium Avenue, West Lafayette, IN, 47907, USA
| | - Ji Eun Park
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea
| | - L Tiffany Lyle
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN, 47907, USA
| | - Wooin Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea
| | - Yoon Yeo
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN, 47907, USA; Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive, West Lafayette, IN, 47907, USA.
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19
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Lau A, Chung H, Komada T, Platnich JM, Sandall CF, Choudhury SR, Chun J, Naumenko V, Surewaard BG, Nelson MC, Ulke-Lemée A, Beck PL, Benediktsson H, Jevnikar AM, Snelgrove SL, Hickey MJ, Senger DL, James MT, Macdonald JA, Kubes P, Jenne CN, Muruve DA. Renal immune surveillance and dipeptidase-1 contribute to contrast-induced acute kidney injury. J Clin Invest 2018; 128:2894-2913. [PMID: 29863495 DOI: 10.1172/jci96640] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 04/10/2018] [Indexed: 01/04/2023] Open
Abstract
Radiographic contrast agents cause acute kidney injury (AKI), yet the underlying pathogenesis is poorly understood. Nod-like receptor pyrin containing 3-deficient (Nlrp3-deficient) mice displayed reduced epithelial cell injury and inflammation in the kidney in a model of contrast-induced AKI (CI-AKI). Unexpectedly, contrast agents directly induced tubular epithelial cell death in vitro that was not dependent on Nlrp3. Rather, contrast agents activated the canonical Nlrp3 inflammasome in macrophages. Intravital microscopy revealed diatrizoate (DTA) uptake within minutes in perivascular CX3CR1+ resident phagocytes in the kidney. Following rapid filtration into the tubular luminal space, DTA was reabsorbed and concentrated in tubular epithelial cells via the brush border enzyme dipeptidase-1 in volume-depleted but not euvolemic mice. LysM-GFP+ macrophages recruited to the kidney interstitial space ingested contrast material transported from the urine via direct interactions with tubules. CI-AKI was dependent on resident renal phagocytes, IL-1, leukocyte recruitment, and dipeptidase-1. Levels of the inflammasome-related urinary biomarkers IL-18 and caspase-1 were increased immediately following contrast administration in patients undergoing coronary angiography, consistent with the acute renal effects observed in mice. Taken together, these data show that CI-AKI is a multistep process that involves immune surveillance by resident and infiltrating renal phagocytes, Nlrp3-dependent inflammation, and the tubular reabsorption of contrast via dipeptidase-1.
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Affiliation(s)
- Arthur Lau
- Department of Medicine.,Snyder Institute for Chronic Diseases
| | - Hyunjae Chung
- Department of Medicine.,Snyder Institute for Chronic Diseases
| | - Takanori Komada
- Department of Medicine.,Snyder Institute for Chronic Diseases
| | - Jaye M Platnich
- Department of Medicine.,Snyder Institute for Chronic Diseases
| | - Christina F Sandall
- Department of Biochemistry and Molecular Biology.,Libin Cardiovascular Institute of Alberta
| | | | - Justin Chun
- Department of Medicine.,Snyder Institute for Chronic Diseases
| | - Victor Naumenko
- Snyder Institute for Chronic Diseases.,Department of Microbiology, Immunology, and Infectious Diseases, and
| | - Bas Gj Surewaard
- Snyder Institute for Chronic Diseases.,Department of Microbiology, Immunology, and Infectious Diseases, and
| | | | - Annegret Ulke-Lemée
- Department of Biochemistry and Molecular Biology.,Libin Cardiovascular Institute of Alberta
| | - Paul L Beck
- Department of Medicine.,Snyder Institute for Chronic Diseases
| | - Hallgrimur Benediktsson
- Snyder Institute for Chronic Diseases.,Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Anthony M Jevnikar
- Department of Medicine, University of Western Ontario, London, Ontario, Canada
| | - Sarah L Snelgrove
- Centre for Inflammatory Diseases, Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia
| | - Michael J Hickey
- Centre for Inflammatory Diseases, Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia
| | - Donna L Senger
- Department of Oncology.,Arnie Charbonneau Cancer Institute
| | - Matthew T James
- Department of Medicine.,Libin Cardiovascular Institute of Alberta
| | - Justin A Macdonald
- Department of Biochemistry and Molecular Biology.,Libin Cardiovascular Institute of Alberta
| | - Paul Kubes
- Snyder Institute for Chronic Diseases.,Department of Microbiology, Immunology, and Infectious Diseases, and
| | - Craig N Jenne
- Snyder Institute for Chronic Diseases.,Department of Microbiology, Immunology, and Infectious Diseases, and
| | - Daniel A Muruve
- Department of Medicine.,Snyder Institute for Chronic Diseases
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20
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van Bergenhenegouwen J, Kraneveld AD, Rutten L, Garssen J, Vos AP, Hartog A. Lipoproteins attenuate TLR2 and TLR4 activation by bacteria and bacterial ligands with differences in affinity and kinetics. BMC Immunol 2016; 17:42. [PMID: 27793087 PMCID: PMC5086051 DOI: 10.1186/s12865-016-0180-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 10/19/2016] [Indexed: 12/28/2022] Open
Abstract
Background The small intestine is a specialized compartment were close interactions take place between host, microbes, food antigens and dietary fatty acids. Dietary fats get absorbed by epithelial cells and processed into a range of lipoprotein particles after which they are basolaterally secreted and collected in the lymphatics. In contrast to the colon, the small intestine is covered only by a thin mucus coat that allows for intimate interactions between host-cells and microbes. Lipoproteins have long been recognized as protective factors in infectious diseases via the neutralization of bacterial toxins like lipopolysaccharides. Much less attention has been given to the potential role of lipoproteins as factors contributing to the maintenance of small intestinal immune homeostasis via modulating bacteria-induced immune responses. Results Lipoproteins VLDL, LDL and HDL were found to neutralize TLR responses towards specific TLR-ligands or a selection of gram-negative and gram-positive bacteria. Attenuation of TLR2 activity was acute and only slightly improved by longer pre-incubation times of ligands and lipoproteins with no differences between bacterial-lipopeptides or bacteria. In contrast, attenuation of TLR4 responses was only observed after extensive preincubation of lipoproteins and LPS. Preincubation of bacteria and lipoproteins led only to a modest attenuation of TLR4 activity. Moreover, compared to TLR2, TLR4 activity could only be attenuated by lipoproteins over a small ligand dose range. Conclusions These results demonstrate the ability of lipoproteins VLDL, LDL and HDL to inhibit TLR responses towards bacterial-ligands and bacteria. Presence of lipoproteins was found to modulate the MAMP-induced cytokine release by primary human monocytes measured as changes in the release of IL-6, TNFα, GM-CSF and IFNγ. Using TLR2 and TLR4-reporter cells, lipoproteins were found to inhibit TLR responses with differences in affinity and kinetics. These data establish a role for lipoproteins as immunoregulatory molecules, attenuating TLR-responses and thereby positively contributing to mucosal homeostasis. Electronic supplementary material The online version of this article (doi:10.1186/s12865-016-0180-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jeroen van Bergenhenegouwen
- Nutricia Research, Utrecht, The Netherlands. .,Department of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands.
| | - Aletta D Kraneveld
- Department of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | | | - Johan Garssen
- Nutricia Research, Utrecht, The Netherlands.,Department of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | | | - Anita Hartog
- Nutricia Research, Utrecht, The Netherlands.,Department of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
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21
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Watson DC, Bayik D, Srivatsan A, Bergamaschi C, Valentin A, Niu G, Bear J, Monninger M, Sun M, Morales-Kastresana A, Jones JC, Felber BK, Chen X, Gursel I, Pavlakis GN. Efficient production and enhanced tumor delivery of engineered extracellular vesicles. Biomaterials 2016; 105:195-205. [PMID: 27522254 DOI: 10.1016/j.biomaterials.2016.07.003] [Citation(s) in RCA: 247] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 07/01/2016] [Accepted: 07/05/2016] [Indexed: 12/20/2022]
Abstract
Extracellular vesicles (EV), including exosomes and microvesicles, are nano-sized intercellular communication vehicles that participate in a multitude of physiological processes. Due to their biological properties, they are also promising candidates for the systemic delivery of therapeutic compounds, such as cytokines, chemotherapeutic drugs, siRNAs and viral vectors. However, low EV production yield and rapid clearance of administered EV by liver macrophages limit their potential use as therapeutic vehicles. We have used a hollow-fiber bioreactor for the efficient production of bioactive EV bearing the heterodimeric cytokine complex Interleukin-15:Interleukin-15 receptor alpha. Bioreactor culture yielded ∼40-fold more EV per mL conditioned medium, as compared to conventional cell culture. Biophysical analysis and comparative proteomics suggested a more diverse population of EV in the bioreactor preparations, while serum protein contaminants were detectable only in conventional culture EV preparations. We also identified the Scavenger Receptor Class A family (SR-A) as a novel monocyte/macrophage uptake receptor for EV. In vivo blockade of SR-A with dextran sulfate dramatically decreased EV liver clearance in mice, while enhancing tumor accumulation. These findings facilitate development of EV therapeutic methods.
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Affiliation(s)
- Dionysios C Watson
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States; Department of Medicine, University of Patras, Greece
| | - Defne Bayik
- Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States; Department of Molecular Biology and Genetics, Bilkent University, Ankara, 06800 Turkey
| | - Avinash Srivatsan
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, United States
| | - Cristina Bergamaschi
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Antonio Valentin
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Gang Niu
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, United States
| | - Jenifer Bear
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Mitchell Monninger
- Pathology Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD 21702, United States
| | - Mei Sun
- Pathology Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD 21702, United States
| | - Aizea Morales-Kastresana
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, United States
| | - Jennifer C Jones
- Vaccine Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, United States
| | - Barbara K Felber
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States
| | - Xiaoyuan Chen
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, United States
| | - Ihsan Gursel
- Department of Molecular Biology and Genetics, Bilkent University, Ankara, 06800 Turkey
| | - George N Pavlakis
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, United States.
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Gordon S. Phagocytosis: An Immunobiologic Process. Immunity 2016; 44:463-475. [DOI: 10.1016/j.immuni.2016.02.026] [Citation(s) in RCA: 352] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 02/09/2016] [Accepted: 02/23/2016] [Indexed: 12/27/2022]
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Chattopadhyay A, Grijalva V, Hough G, Su F, Mukherjee P, Farias-Eisner R, Anantharamaiah GM, Faull KF, Hwang LH, Navab M, Fogelman AM, Reddy ST. Efficacy of tomato concentrates in mouse models of dyslipidemia and cancer. Pharmacol Res Perspect 2015; 3:e00154. [PMID: 26171234 PMCID: PMC4492730 DOI: 10.1002/prp2.154] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 05/08/2015] [Accepted: 05/13/2015] [Indexed: 12/14/2022] Open
Abstract
We previously reported that adding freeze-dried tomato powder from transgenic plants expressing the apolipoprotein A-I mimetic peptide 6F at 2.2% by weight to a Western diet (WD) ameliorated dyslipidemia and atherosclerosis in mice. The same dose in a human would require three cups of tomato powder three times daily. To reduce the volume, we sought a method to concentrate 6F. Remarkably, extracting the transgenic freeze-dried tomato overnight in ethyl acetate with 5% acetic acid resulted in a 37-fold reduction in the amount of transgenic tomato needed for biologic activity. In a mouse model of dyslipidemia, adding 0.06% by weight of the tomato concentrate expressing the 6F peptide (Tg6F) to a WD significantly reduced plasma total cholesterol and triglycerides (P < 0.0065). In a mouse model of colon cancer metastatic to the lungs, adding 0.06% of Tg6F, but not a control tomato concentrate (EV), to standard mouse chow reduced tumor-associated neutrophils by 94 ± 1.1% (P = 0.0052), and reduced tumor burden by two-thirds (P = 0.0371). Adding 0.06% of either EV or Tg6F by weight to standard mouse chow significantly reduced tumor burden in a mouse model of ovarian cancer; however, Tg6F was significantly more effective (35% reduction for EV vs. 53% reduction for Tg6F; P = 0.0069). Providing the same dose of tomato concentrate to humans would require only two tablespoons three times daily making this a practical approach for testing oral apoA-I mimetic therapy in the treatment of dyslipidemia and cancer.
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Affiliation(s)
- Arnab Chattopadhyay
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Victor Grijalva
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Greg Hough
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Feng Su
- Department of Obstetrics and Gynecology, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Pallavi Mukherjee
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Robin Farias-Eisner
- Department of Obstetrics and Gynecology, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - G M Anantharamaiah
- Department of Medicine, University of Alabama at Birmingham Birmingham, Alabama, 35294
| | - Kym F Faull
- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Lin H Hwang
- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Mohamad Navab
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Alan M Fogelman
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
| | - Srinivasa T Reddy
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736 ; Department of Obstetrics and Gynecology, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736 ; Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA Los Angeles, California, 90095-1736
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Kelley JL, Ozment TR, Li C, Schweitzer JB, Williams DL. Scavenger receptor-A (CD204): a two-edged sword in health and disease. Crit Rev Immunol 2015; 34:241-61. [PMID: 24941076 DOI: 10.1615/critrevimmunol.2014010267] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Scavenger receptor A (SR-A), also known as the macrophage scavenger receptor and cluster of differentiation 204 (CD204), plays roles in lipid metabolism, atherogenesis, and a number of metabolic processes. However, recent evidence points to important roles for SR-A in inflammation, innate immunity, host defense, sepsis, and ischemic injury. Herein, we review the role of SR-A in inflammation, innate immunity, host defense, sepsis, cardiac and cerebral ischemic injury, Alzheimer's disease, virus recognition and uptake, bone metabolism, and pulmonary injury. Interestingly, SR-A is reported to be host protective in some disease states, but there is also compelling evidence that SR-A plays a role in the pathophysiology of other diseases. These observations of both harmful and beneficial effects of SR-A are discussed here in the framework of inflammation, innate immunity, and endoplasmic reticulum stress.
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Affiliation(s)
- Jim L Kelley
- Departments of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614
| | - Tammy R Ozment
- Departments of Surgery, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614
| | - Chuanfu Li
- Departments of Surgery, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614
| | - John B Schweitzer
- Departments of Pathology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614
| | - David L Williams
- Departments of Surgery, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614
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Korman BD, Huang CC, Skamra C, Wu P, Koessler R, Yao D, Huang QQ, Pearce W, Sutton-Tyrrell K, Kondos G, Edmundowicz D, Pope R, Ramsey-Goldman R. Inflammatory expression profiles in monocyte-to-macrophage differentiation in patients with systemic lupus erythematosus and relationship with atherosclerosis. Arthritis Res Ther 2014; 16:R147. [PMID: 25011540 PMCID: PMC4227297 DOI: 10.1186/ar4609] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 06/10/2014] [Indexed: 01/30/2023] Open
Abstract
Introduction Our objectives were to examine mononuclear cell gene expression profiles in patients with systemic lupus erythematosus (SLE) and healthy controls and to compare subsets with and without atherosclerosis to determine which genes’ expression is related to atherosclerosis in SLE. Methods Monocytes were obtained from 20 patients with SLE and 16 healthy controls and were in vitro-differentiated into macrophages. Subjects also underwent laboratory and imaging studies to evaluate for subclinical atherosclerosis. Whole-genome RNA expression microarray was performed, and gene expression was examined. Results Gene expression profiling was used to identify gene signatures that differentiated patients from controls and individuals with and without atherosclerosis. In monocytes, 9 out of 20 patients with SLE had an interferon-inducible signature compared with 2 out of 16 controls. By looking at gene expression during monocyte-to-macrophage differentiation, we identified pathways which were differentially regulated between SLE and controls and identified signatures based on relevant intracellular signaling molecules which could differentiate SLE patients with atherosclerosis from controls. Among patients with SLE, we used a previously defined 344-gene atherosclerosis signature in monocyte-to-macrophage differentiation to identify patient subgroups with and without atherosclerosis. Interestingly, this signature further classified patients on the basis of the presence of SLE disease activity and cardiovascular risk factors. Conclusions Many genes were differentially regulated during monocyte-to-macrophage differentiation in SLE patients compared with controls. The expression of these genes in mononuclear cells is important in the pathogenesis of SLE, and molecular profiling using gene expression can help stratify SLE patients who may be at risk for development of atherosclerosis.
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Multimodality PET/MRI agents targeted to activated macrophages. J Biol Inorg Chem 2013; 19:247-58. [PMID: 24166283 DOI: 10.1007/s00775-013-1054-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 10/08/2013] [Indexed: 12/18/2022]
Abstract
The recent emergence of multimodality imaging, particularly the combination of PET and MRI, has led to excitement over the prospect of improving detection of disease. Iron oxide nanoparticles have become a popular platform for the fabrication of PET/MRI probes owing to their advantages of high MRI detection sensitivity, biocompatibility, and biodegradability. In this article, we report the synthesis of dextran-coated iron oxide nanoparticles (DIO) labeled with the positron emitter (64)Cu to generate a PET/MRI probe, and modified with maleic anhydride to increase the negative surface charge. The modified nanoparticulate PET/MRI probe (MDIO-(64)Cu-DOTA) bears repetitive anionic charges on the surface that facilitate recognition by scavenger receptor type A (SR-A), a ligand receptor found on activated macrophages but not on normal vessel walls. MDIO-(64)Cu-DOTA has an average iron oxide core size of 7-8 nm, an average hydrodynamic diameter of 62.7 nm, an r1 relaxivity of 16.8 mM(-1) s(-1), and an r 2 relaxivity of 83.9 mM(-1) s(-1) (37 °C, 1.4 T). Cell studies confirmed that the probe was nontoxic and was specifically taken up by macrophages via SR-A. In comparison with the nonmodified analog, the accumulation of MDIO in macrophages was substantially improved. These characteristics demonstrate the promise of MDIO-(64)Cu-DOTA for identification of vulnerable atherosclerotic plaques via the targeting of macrophages.
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Chatzigeorgiou A, Kandaraki E, Piperi C, Livadas S, Papavassiliou AG, Koutsilieris M, Papalois A, Diamanti-Kandarakis E. Dietary glycotoxins affect scavenger receptor expression and the hormonal profile of female rats. J Endocrinol 2013; 218:331-7. [PMID: 23823020 DOI: 10.1530/joe-13-0175] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The levels of advanced glycation end products (AGEs) are increased under conditions of impaired glucose metabolism and/or oxidative stress, promoting insulin resistance and other endocrine abnormalities. AGEs play a major role in the pathogenesis of several diseases such as diabetes, atherosclerosis, polycystic ovary syndrome and Alzheimer's disease, contributing to progressive ageing. Receptor-based clearance of AGEs by the receptor for AGE (RAGE) and/or the macrophage scavenger receptor A (SR-A) is considered as a main factor for the regulation of the concentration of AGEs under these conditions. This study aimed to investigate the expression of RAGE (AGER) and SR-A (MSR1) under high/low-dietary AGE conditions in vivo and their potential contribution to the metabolic and sex hormonal profile of female rats. Female Wistar rats were fed a low-AGE or high-AGE diet for 3 months. Serum samples were collected at baseline and at the completion of the 3-month period for the measurements of metabolic and hormonal parameters. Peripheral blood mononuclear cells (PBMCs) were isolated for the determination of the expression of RAGE and SR-A. The high-AGE diet-fed rats exhibited increased glucose, insulin and testosterone levels as well as decreased oestradiol and progesterone levels compared with the low-AGE diet-fed ones, thus indicating a metabolic and hormonal dysregulation attributed to high-AGE dietary exposure. The expression of RAGE was significantly down-regulated in the PBMCs of the high-AGE diet-fed rats (P=0.041), and it was correlated negatively with insulin and testosterone levels and positively with progesterone levels. The expression of SR-A was also decreased in the high-AGE diet-fed rats to marginal significance. Decreased monocytic expression of scavenger receptors such as RAGE and SR-A may result in a higher deposition of AGEs in peripheral endocrine tissues, thus promoting endocrine-related abnormalities and diseases.
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Chao Y, Karmali PP, Mukthavaram R, Kesari S, Kouznetsova VL, Tsigelny IF, Simberg D. Direct recognition of superparamagnetic nanocrystals by macrophage scavenger receptor SR-AI. ACS NANO 2013; 7:4289-4298. [PMID: 23614696 DOI: 10.1021/nn400769e] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Scavenger receptors (SRs) are molecular pattern recognition receptors that have been shown to mediate opsonin-independent uptake of therapeutic and imaging nanoparticles, underlying the importance of SRs in nanomedicine. Unlike pathogens, engineered nanomaterials offer great flexibility in control of surface properties, allowing addressing specific questions regarding the molecular mechanisms of nanoparticle recognition. Recently, we showed that SR-type AI/II mediates opsonin-independent internalization of dextran superparamagnetic iron oxide (SPIO) nanoparticles via positively charged extracellular collagen-like domain. To understand the mechanism of opsonin-independent SPIO recognition, we tested the binding and uptake of nanoparticles with different surface coatings by SR-AI. SPIO coated with 10 kDa dextran was efficiently recognized and taken up by SR-AI transfected cells and J774 macrophages, while SPIO with 20 kDa dextran coating or cross-linked dextran hydrogel avoided the binding and uptake. Nanoparticle negative charge density and zeta-potential did not correlate with SR-AI binding/uptake efficiency. Additional experiments and computer modeling revealed that recognition of the iron oxide crystalline core by the positively charged collagen-like domain of SR-AI is sterically hindered by surface polymer coating. Importantly, the modeling revealed a strong complementarity between the surface Fe-OH groups of the magnetite crystal and the charged lysines of the collagen-like domain of SR-AI, suggesting a specific recognition of SPIO crystalline surface. These data provide an insight into the molecular recognition of nanocrystals by innate immunity receptors and the mechanisms whereby polymer coatings promote immune evasion.
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Affiliation(s)
- Ying Chao
- Neuro-Oncology Program, Moores UCSD Cancer Center, University of California San Diego, La Jolla, California 92093-0819, United States
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Neyen C, Plüddemann A, Mukhopadhyay S, Maniati E, Bossard M, Gordon S, Hagemann T. Macrophage scavenger receptor a promotes tumor progression in murine models of ovarian and pancreatic cancer. THE JOURNAL OF IMMUNOLOGY 2013; 190:3798-805. [PMID: 23447685 DOI: 10.4049/jimmunol.1203194] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Alternatively activated macrophages express the pattern recognition receptor scavenger receptor A (SR-A). We demonstrated previously that coculture of macrophages with tumor cells upregulates macrophage SR-A expression. We show in this study that macrophage SR-A deficiency inhibits tumor cell migration in a coculture assay. We further demonstrate that coculture of tumor-associated macrophages and tumor cells induces secretion of factors that are recognized by SR-A on tumor-associated macrophages. We tentatively identified several potential ligands for the SR-A receptor in tumor cell-macrophage cocultures by mass spectrometry. Competing with the coculture-induced ligand in our invasion assay recapitulates SR-A deficiency and leads to similar inhibition of tumor cell invasion. In line with our in vitro findings, tumor progression and metastasis are inhibited in SR-A(-/-) mice in two in vivo models of ovarian and pancreatic cancer. Finally, treatment of tumor-bearing mice with 4F, a small peptide SR-A ligand able to compete with physiological SR-A ligands in vitro, recapitulates the inhibition of tumor progression and metastasis observed in SR-A(-/-) mice. Our observations suggest that SR-A may be a potential drug target in the prevention of metastatic cancer progression.
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Affiliation(s)
- Claudine Neyen
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
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Su T, Zhao L, Ruan X, Zuo G, Gong J. Synergistic effect of scavenger receptor A and low-density lipoprotein receptor on macrophage foam cell formation under inflammatory stress. Mol Med Rep 2012; 7:37-42. [PMID: 23139052 DOI: 10.3892/mmr.2012.1170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Accepted: 03/19/2012] [Indexed: 11/06/2022] Open
Abstract
To provide experimental evidence for the effect of inflammation on cholesterol accumulation in macrophages, we investigated the expression of low-density lipoprotein receptor (LDL-R) and scavenger receptor A (SR-A) genes and proteins in the lipopolysaccharide (LPS)-stimulated macrophage-like RAW264.7 cell line. RAW264.7 cells were incubated in serum-free medium in the absence or presence of LDL alone, LDL+LPS and LPS alone. Intracellular cholesterol content, tumor necrosis factor α levels in the supernatants, mRNA and protein expression of LDL-R and SR-A in the treated cells were assessed by Oil Red O staining cholesterol enzymatic assay, enzyme-linked immunosorbent assay, semi-quantitative polymerase chain reaction and western blot analysis, respectively. Our results demonstrated that LPS was able to upregulate SR-A mRNA and protein expression, override LDL-R suppression induced by a high dose of LDL and increase LDL uptake by enhancing receptor expression, leading to foam cell formation in RAW264.7 cells. These findings suggest that the synergy of the upregulation of SR-A and dysregulation of LDL-R under inflammatory stress may contribute to macrophage-derived foam cell formation.
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Affiliation(s)
- Tianyi Su
- Chongqing Key Laboratory of Hepatobiliary Surgery and Department of Hepatobiliary Surgery, Second Affiliated Hospital to Chongqing Medical University, Chongqing, PR China
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Herrmann M, Schäfer C, Heiss A, Gräber S, Kinkeldey A, Büscher A, Schmitt MM, Bornemann J, Nimmerjahn F, Herrmann M, Helming L, Gordon S, Jahnen-Dechent W. Clearance of Fetuin-A–Containing Calciprotein Particles Is Mediated by Scavenger Receptor-A. Circ Res 2012; 111:575-84. [DOI: 10.1161/circresaha.111.261479] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Marietta Herrmann
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Cora Schäfer
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Alexander Heiss
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Steffen Gräber
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Anne Kinkeldey
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Andrea Büscher
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Martin M.N. Schmitt
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Jörg Bornemann
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Falk Nimmerjahn
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Martin Herrmann
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Laura Helming
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Siamon Gordon
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
| | - Willi Jahnen-Dechent
- From Helmholtz Institute for Biomedical Engineering, Biointerface Group (M.H., C.S., A.H., S.G., A.K., A.B., W.J.-D.), Institute for Molecular Cardiovascular Research (M.M.N.S.), and Department of Pathology, Electron Microscopic Facility (J.B.), RWTH Aachen University, Germany; the Department of Biology, Institute of Genetics, Friedrich-Alexander University of Erlangen-Nuremberg, Germany (F.N.); the Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University
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Sundqvist J, Andersson KL, Scarselli G, Gemzell-Danielsson K, Lalitkumar PGL. Expression of adhesion, attachment and invasion markers in eutopic and ectopic endometrium: a link to the aetiology of endometriosis. Hum Reprod 2012; 27:2737-46. [DOI: 10.1093/humrep/des220] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Abstract
Although already evident from the earliest days of macrophage research, the diversity of macrophage distribution, morphology, and function continues to attract immunologists interested in their role in physiology and disease. Contemporary tools of cellular and molecular analysis have begun to unravel their versatile and adaptable gene expression, the result of differentiation and modulation by their environment. In this brief account, I outline the history of my personal involvement in this subject.
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Affiliation(s)
- Siamon Gordon
- From the Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
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Mancia A, Ryan JC, Chapman RW, Wu Q, Warr GW, Gulland FMD, Van Dolah FM. Health status, infection and disease in California sea lions (Zalophus californianus) studied using a canine microarray platform and machine-learning approaches. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2012; 36:629-637. [PMID: 22067742 DOI: 10.1016/j.dci.2011.10.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 10/21/2011] [Accepted: 10/22/2011] [Indexed: 05/31/2023]
Abstract
Conservation biologists face many challenges in assessing health, immune status and infectious diseases in protected species. These challenges include unpredictable sample populations, diverse genetic and environmental backgrounds of the animals, as well as the practical, legal and ethical issues involved in experimentation. The use of whole genome scale transcriptomics with animal samples obtained in a minimally invasive manner is an approach that shows promise for health assessment. In this study we assessed the utility of a microarray to identify changes in gene expression predictive of health status by interrogating blood samples from California sea lions (Zalophus californianus) in rehabilitation. A custom microarray was developed from the commercially available dog microarray (Canis familiaris) by selecting probes that demonstrated reliable cross-hybridization with RNA in sea lion blood. This custom microarray was used for the analysis of RNA from 73 sea lion blood samples, from animals with a broad spectrum of health changes. Both traditional classifying techniques and newer artificial neural network approaches correctly classified sea lions with respect to health status, primarily distinguishing between leptospirosis infection and domoic acid exposure. Real time PCR validation for a small set of genes, followed by sequencing, showed good correlation with array results and high identity (96-98%) between the dog and sea lion sequences. This approach to health status classification shows promise for disease identification in a clinical setting, and assessment of health status of wildlife.
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Affiliation(s)
- Annalaura Mancia
- Medical University of South Carolina, Marine Biomedicine and Environmental Sciences Center, Hollings Marine Laboratory, 331 Ft Johnson Rd., Charleston, SC 29412, USA.
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Kzhyshkowska J, Neyen C, Gordon S. Role of macrophage scavenger receptors in atherosclerosis. Immunobiology 2012; 217:492-502. [PMID: 22437077 DOI: 10.1016/j.imbio.2012.02.015] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2012] [Accepted: 02/19/2012] [Indexed: 12/22/2022]
Abstract
Accumulating evidence indicates that atherosclerosis is a chronic inflammatory disease. The key innate immune cells that are involved in the pathogenesis of atherosclerosis are circulating monocytes and plaque macrophages. Complex interplay between immune and metabolic processes results in pathological activity of these cells. The best understood pathological process mediated by macrophages is their inability to process modified lipoproteins properly resulting in the formation of foamy cells, which are a dangerous component of atherosclerotic plaques. Key molecules involved in the recognition and processing of modified lipoproteins are scavenger receptors (SR). This is a large family of surface expressed structurally heterogeneous receptors with a broad spectrum of endogenous and exogenous ligands. The common functional feature of SR is internalisation of extracellular components and targeting them for lysosomal degradation. However, these relatively simple functions can have complex consequences, since they are linked to diverse specific signalling pathways and to other membrane transport pathways. Moreover, scavenger receptors can co-operate with other types of receptors increasing the variability of the macrophage response to multiple extracellular ligands. At least some SRs respond to modified lipoproteins by amplification of inflammation and accumulation of macrophages in the plaque, while some SRs may support tolerogenic reactions. Outcome of different SR activities will be the decision of monocytes and macrophage to guard homeostatic balance, support atherosclerosis progression and plaque instability by inflammatory reactions, or support rapid fibrotic processes in the plaque that stabilise it. Despite the accumulating knowledge about the molecular mechanisms of scavenger receptor action, their role in the progression of atherosclerosis remains controversial. The activities of scavenger receptors that can contribute to each of these processes are a subject of current review.
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Affiliation(s)
- Julia Kzhyshkowska
- Department of Dermatology, Medical Faculty Mannheim, Ruprecht-Karls University of Heidelberg, Germany.
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Effect of overexpression of human SR-AI on oxLDL uptake and apoptosis in 293T cells. Int Immunopharmacol 2011; 11:1752-7. [DOI: 10.1016/j.intimp.2011.07.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 07/01/2011] [Accepted: 07/01/2011] [Indexed: 12/15/2022]
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Garai K, Baban B, Frieden C. Dissociation of apolipoprotein E oligomers to monomer is required for high-affinity binding to phospholipid vesicles. Biochemistry 2011; 50:2550-8. [PMID: 21322570 DOI: 10.1021/bi1020106] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The apolipoprotein apoE plays a key role in cholesterol and lipid metabolism. There are three isoforms of this protein, one of which, apoE4, is the major risk factor for Alzheimer's disease. At micromolar concentrations all lipid-free apoE isoforms exist primarily as monomers, dimers, and tetramers. However, the molecular weight form of apoE that binds to lipid has not been clearly defined. We have examined the role of self-association of apoE with respect to interactions with phospholipids. Measurements of the time dependence of turbidity clearance of small unilamellar vesicles of dimyristoyl-sn-glycero-3-phosphocholine (DMPC) upon addition of apoE show that higher molecular weight oligomers bind poorly if at all. The kinetic data can be described by a reaction model in which tetramers and dimers of apoE must first dissociate to monomers which then bind to the liposome surface in a fast and reversible manner. A slow but not readily reversible conformational conversion of the monomer then occurs. Prior knowledge of the rate constants for the association-dissociation process allows us to determine the rate constant of the conformational conversion. This rate constant is isoform dependent and appears to correlate with the stability of the apoE isoforms with the rate of dissociation of the apoE oligomers to monomers being the rate-limiting process for lipidation. Differences in the lipidation kinetics between the apoE isoforms arise from their differences in the self-association behavior leading to the conclusion that self-association behavior may influence biological functions of apoE in an isoform-dependent manner.
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Affiliation(s)
- Kanchan Garai
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, United States
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Abstract
Scavenger receptors (SRs) are structurally diverse but functionally related innate immune receptors involved in defence and clearance mechanisms. Their broad specificity relies on evolutionarily conserved pattern recognition domains which interact with a variety of microbial, apoptotic and modified self ligands. Studies of immune functions of SR-expressing cells require the identification of interaction partners for SRs. We have developed an ELISA-based method which allows for large-scale high-throughput screening of complex mixtures. The assay successfully identified bacterial and plasma ligands for macrophage scavenger receptor A and can be adapted to screen for novel exogenous or endogenous ligands for any immune receptor of interest.
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Affiliation(s)
- Claudine Neyen
- Department of Biochemistry, Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
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Zensi A, Begley D, Pontikis C, Legros C, Mihoreanu L, Büchel C, Kreuter J. Human serum albumin nanoparticles modified with apolipoprotein A-I cross the blood-brain barrier and enter the rodent brain. J Drug Target 2010; 18:842-8. [PMID: 20849354 DOI: 10.3109/1061186x.2010.513712] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Nanoparticles made of human serum albumin (HSA) and modified with apolipoproteins have previously been shown to transport drugs, which normally do not enter the brain, across the blood-brain barrier (BBB). However the precise mechanism by which nanoparticles with different apolipoproteins on their surface can target to the brain, as yet, has not been totally elucidated. In the present study, HSA nanoparticles with covalently bound apolipoprotein A-I (Apo A-I) as a targetor for brain capillary endothelial cells were injected intravenously into SV 129 mice and Wistar rats. The rodents were sacrificed after 15 or 30 min, and their brains were examined by transmission electron microscopy. Apo A-I nanoparticles could be found inside the endothelial cells of brain capillaries as well as within parenchymal brain tissue of both, mice and rats, whereas control particles without Apo A-I on their surface did not cross the BBB during our experiments. The maintenance of tight junction integrity and barrier function during treatment with nanoparticles was demonstrated by perfusion with a fixative containing lanthanum nitrate as an electron dense marker for the permeability of tight junctions.
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Affiliation(s)
- Anja Zensi
- Goethe-University, Institute of Pharmaceutical Technology, Frankfurt am Main, Germany
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