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A multi-pulse ultrasound technique for imaging of thick-shelled microbubbles demonstrated in vitro and in vivo. PLoS One 2022; 17:e0276292. [PMID: 36327225 PMCID: PMC9632906 DOI: 10.1371/journal.pone.0276292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 10/04/2022] [Indexed: 11/06/2022] Open
Abstract
Contrast enhanced ultrasound is a powerful diagnostic tool and ultrasound contrast media are based on microbubbles (MBs). The use of MBs in drug delivery applications and molecular imaging is a relatively new field of research which has gained significant interest during the last decade. MBs available for clinical use are fragile with short circulation half-lives due to the use of a thin encapsulating shell for stabilization of the gas core. Thick-shelled MBs can have improved circulation half-lives, incorporate larger amounts of drugs for enhanced drug delivery or facilitate targeting for use in molecular ultrasound imaging. However, methods for robust imaging of thick-shelled MBs are currently not available. We propose a simple multi-pulse imaging technique which is able to visualize thick-shelled polymeric MBs with a superior contrast-to-tissue ratio (CTR) compared to commercially available harmonic techniques. The method is implemented on a high-end ultrasound scanner and in-vitro imaging in a tissue mimicking flow phantom results in a CTR of up to 23 dB. A proof-of-concept study of molecular ultrasound imaging in a soft tissue inflammation model in rabbit is then presented where the new imaging technique showed an enhanced accumulation of targeted MBs in the inflamed tissue region compared to non-targeted MBs and a mean CTR of 13.3 dB for stationary MBs. The presence of fluorescently labelled MBs was verified by confocal microscopy imaging of tissue sections post-mortem.
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Sheng C, Zhao J, Di Z, Huang Y, Zhao Y, Li L. Spatially resolved in vivo imaging of inflammation-associated mRNA via enzymatic fluorescence amplification in a molecular beacon. Nat Biomed Eng 2022; 6:1074-1084. [PMID: 36050523 DOI: 10.1038/s41551-022-00932-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 07/26/2022] [Indexed: 11/09/2022]
Abstract
The in vivo optical imaging of RNA biomarkers of inflammation is hindered by low signal-to-background ratios, owing to non-specific signal amplification in healthy tissues. Here we report the design and in vivo applicability, for the imaging of inflammation-associated messenger RNAs (mRNAs), of a molecular beacon bearing apurinic/apyrimidinic sites, whose amplification of fluorescence is triggered by human apurinic/apyrimidinic endonuclease 1 on translocation from the nucleus into the cytoplasm specifically in inflammatory cells. We assessed the sensitivity and tissue specificity of an engineered molecular beacon targeting interleukin-6 (IL-6) mRNA in live mice, by detecting acute inflammation in their paws and drug-induced inflammation in their livers. This enzymatic-amplification strategy may enable the specific and sensitive imaging of other disease-relevant RNAs in vivo.
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Affiliation(s)
- Chuangui Sheng
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China.,College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, China
| | - Jian Zhao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China.,College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, China
| | - Zhenghan Di
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China.,College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, China
| | - Yuanyu Huang
- Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, China
| | - Yuliang Zhao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China.,College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, China.,GBA Research Innovation Institute for Nanotechnology, Guangdong, China
| | - Lele Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China. .,College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, China. .,GBA Research Innovation Institute for Nanotechnology, Guangdong, China.
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3
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Zheng H, Yuan C, Cai J, Pu W, Wu P, Li C, Li G, Zhang Y, Zhang J, Guo J, Huang D. Early diagnosis of breast cancer lung metastasis by nanoprobe-based luminescence imaging of the pre-metastatic niche. J Nanobiotechnology 2022; 20:134. [PMID: 35292019 PMCID: PMC8922882 DOI: 10.1186/s12951-022-01346-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/02/2022] [Indexed: 11/16/2022] Open
Abstract
Background Early detection of breast cancer lung metastasis remains highly challenging, due to few metastatic cancer cells at an early stage. Herein we propose a new strategy for early diagnosis of lung metastasis of breast cancer by luminescence imaging of pulmonary neutrophil infiltration via self-illuminating nanoprobes. Methods Luminescent nanoparticles (LAD NPs) were engineered using a biocompatible, neutrophil-responsive self-illuminating cyclodextrin material and an aggregation-induced emission agent. The chemiluminescence resonance energy transfer (CRET) effect and luminescence properties of LAD NPs were fully characterized. Using mouse peritoneal neutrophils, in vitro luminescence properties of LAD NPs were thoroughly examined. In vivo luminescence imaging and correlation analyses were performed in mice inoculated with 4T1 cancer cells. Moreover, an active targeting nanoprobe was developed by surface decoration of LAD NPs with a neutrophil-targeting peptide, which was also systemically evaluated by in vitro and in vivo studies. Results LAD NPs can generate long-wavelength and persistent luminescence due to the CRET effect. In a mouse model of 4T1 breast cancer lung metastasis, we found desirable correlation between neutrophils and tumor cells in the lungs, demonstrating the effectiveness of early imaging of the pre-metastatic niche by the newly developed LAD NPs. The active targeting nanoprobe showed further enhanced luminescence imaging capability for early detection of pulmonary metastasis. Notably, the targeting nanoprobe-based luminescence imaging strategy remarkably outperformed PET/CT imaging modalities in the examined mouse model. Also, preliminary tests demonstrated good safety of LAD NPs. Conclusions The neutrophil-targeting imaging strategy based on newly developed luminescence nanoparticles can serve as a promising modality for early diagnosis of lung metastasis of breast cancers. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s12951-022-01346-4.
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Affiliation(s)
- Hanwen Zheng
- Department of Nuclear Medicine, Southwest Hospital, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China.,Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China.,Department of Pharmaceutical Analysis, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Chunsen Yuan
- Department of Nuclear Medicine, Southwest Hospital, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Jiajun Cai
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Wendan Pu
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Peng Wu
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China.,College of Pharmacy and Medical Technology, Hanzhong Vocational and Technical College, Hanzhong, 723000, Shaanxi, China
| | - Chenwen Li
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Gang Li
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Yang Zhang
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China
| | - Jianxiang Zhang
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China. .,State Key Laboratory of Trauma, Burn and Combined Injury, Third Military Medical University (Army Medical University), Chongqing, 400038, China.
| | - Jiawei Guo
- Department of Pharmaceutical Analysis, College of Pharmacy, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China.
| | - Dingde Huang
- Department of Nuclear Medicine, Southwest Hospital, Third Military Medical University (Army Medical University), 30 Gaotanyan Main Street, Chongqing, 400038, China.
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Liu N, Chen X, Kimm MA, Stechele M, Chen X, Zhang Z, Wildgruber M, Ma X. In vivo optical molecular imaging of inflammation and immunity. J Mol Med (Berl) 2021; 99:1385-1398. [PMID: 34272967 DOI: 10.1007/s00109-021-02115-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 06/04/2021] [Accepted: 07/07/2021] [Indexed: 12/20/2022]
Abstract
Inflammation is the phenotypic form of various diseases. Recent development in molecular imaging provides new insights into the diagnostic and therapeutic evaluation of different inflammatory diseases as well as diseases involving inflammation such as cancer. While conventional imaging techniques used in the clinical setting provide only indirect measures of inflammation such as increased perfusion and altered endothelial permeability, optical imaging is able to report molecular information on diseased tissue and cells. Optical imaging is a quick, noninvasive, nonionizing, and easy-to-use diagnostic technology which has been successfully applied for preclinical research. Further development of optical imaging technology such as optoacoustic imaging overcomes the limitations of mere fluorescence imaging, thereby enabling pilot clinical applications in humans. By means of endogenous and exogenous contrast agents, sites of inflammation can be accurately visualized in vivo. This allows for early disease detection and specific disease characterization, enabling more rapid and targeted therapeutic interventions. In this review, we summarize currently available optical imaging techniques used to detect inflammation, including optical coherence tomography (OCT), bioluminescence, fluorescence, optoacoustics, and Raman spectroscopy. We discuss advantages and disadvantages of the different in vivo imaging applications with a special focus on targeting inflammation including immune cell tracking.
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Affiliation(s)
- Nian Liu
- State Key Laboratory of Natural Medicines, Key Laboratory of Drug Quality Control and Pharmacovigilance, Department of Pharmaceutical Analysis, China Pharmaceutical University, Nanjing, 210009, China
- Department of Chemistry, Technical University of Munich, 85747, Garching, Germany
| | - Xiao Chen
- Klinik und Poliklinik IV, University Hospital, LMU Munich, 80336, Munich, Germany
| | - Melanie A Kimm
- Department of Radiology, University Hospital, LMU Munich, 81337, Munich, Germany
| | - Matthias Stechele
- Department of Radiology, University Hospital, LMU Munich, 81337, Munich, Germany
| | - Xueli Chen
- School of Life Science and Technology, Xidian University, Xi'an 710126, China
| | - Zhimin Zhang
- School of Control Science and Engineering, Shandong University, Jinan, 250061, China
| | - Moritz Wildgruber
- Department of Radiology, University Hospital, LMU Munich, 81337, Munich, Germany
| | - Xiaopeng Ma
- School of Control Science and Engineering, Shandong University, Jinan, 250061, China.
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Inflammation and tumor progression: signaling pathways and targeted intervention. Signal Transduct Target Ther 2021; 6:263. [PMID: 34248142 PMCID: PMC8273155 DOI: 10.1038/s41392-021-00658-5] [Citation(s) in RCA: 656] [Impact Index Per Article: 218.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 05/11/2021] [Accepted: 05/23/2021] [Indexed: 02/06/2023] Open
Abstract
Cancer development and its response to therapy are regulated by inflammation, which either promotes or suppresses tumor progression, potentially displaying opposing effects on therapeutic outcomes. Chronic inflammation facilitates tumor progression and treatment resistance, whereas induction of acute inflammatory reactions often stimulates the maturation of dendritic cells (DCs) and antigen presentation, leading to anti-tumor immune responses. In addition, multiple signaling pathways, such as nuclear factor kappa B (NF-kB), Janus kinase/signal transducers and activators of transcription (JAK-STAT), toll-like receptor (TLR) pathways, cGAS/STING, and mitogen-activated protein kinase (MAPK); inflammatory factors, including cytokines (e.g., interleukin (IL), interferon (IFN), and tumor necrosis factor (TNF)-α), chemokines (e.g., C-C motif chemokine ligands (CCLs) and C-X-C motif chemokine ligands (CXCLs)), growth factors (e.g., vascular endothelial growth factor (VEGF), transforming growth factor (TGF)-β), and inflammasome; as well as inflammatory metabolites including prostaglandins, leukotrienes, thromboxane, and specialized proresolving mediators (SPM), have been identified as pivotal regulators of the initiation and resolution of inflammation. Nowadays, local irradiation, recombinant cytokines, neutralizing antibodies, small-molecule inhibitors, DC vaccines, oncolytic viruses, TLR agonists, and SPM have been developed to specifically modulate inflammation in cancer therapy, with some of these factors already undergoing clinical trials. Herein, we discuss the initiation and resolution of inflammation, the crosstalk between tumor development and inflammatory processes. We also highlight potential targets for harnessing inflammation in the treatment of cancer.
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Yan X, Lin W, Liu H, Pu W, Li J, Wu P, Ding J, Luo G, Zhang J. Wavelength-Tunable, Long Lifetime, and Biocompatible Luminescent Nanoparticles Based on a Vitamin E-Derived Material for Inflammation and Tumor Imaging. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2100045. [PMID: 34031977 DOI: 10.1002/smll.202100045] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/09/2021] [Indexed: 06/12/2023]
Abstract
Luminescence imaging is one of the most effective noninvasive strategies for detection and stratification of inflammation and oxidative stress that are closely related to the pathogenesis of numerous acute and chronic diseases. Herein biocompatible nanoparticles based on a peroxalate ester derived from vitamin E (defined as OVE) are developed. In combination with different fluorophores, OVE can generate luminescence systems with emission wavelengths varying from blue to the near-infrared light in its native and nanoparticle forms, in the presence of hydrogen peroxide (H2 O2 ). The OVE-based nanoprobes exhibit high luminescence signals with extremely long lifetime, upon triggering by inflammatory conditions with abnormally elevated H2 O2 . Activated neutrophils and macrophages can be illuminated by this type of luminescent nanoprobes, with luminescence intensities positively correlated with inflammatory cell counts. In mouse models of peritonitis, alcoholic liver injury, drug-induced acute liver injury, and acute lung injury, the developed luminescence nanoprobes enable precision imaging of inflammation and disease progression. Moreover, tumors expressing a high level of H2 O2 can be shined. Importantly, the OVE-based nanoplatform shows excellent in vitro and in vivo biocompatibility.
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Affiliation(s)
- Xinhao Yan
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), Chongqing, 400038, China
- College of Pharmacy and Medical Technology, Hanzhong Vocational and Technical College, Hanzhong, Shaanxi, 723000, China
| | - Wenjie Lin
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Huan Liu
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Wendan Pu
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Junhong Li
- College of Pharmacy and Medical Technology, Hanzhong Vocational and Technical College, Hanzhong, Shaanxi, 723000, China
| | - Peng Wu
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), Chongqing, 400038, China
- College of Pharmacy and Medical Technology, Hanzhong Vocational and Technical College, Hanzhong, Shaanxi, 723000, China
| | - Jun Ding
- Department of Ultrasound, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Gaoxing Luo
- State Key Lab of Trauma, Burn and Combined Injury, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Jianxiang Zhang
- Department of Pharmaceutics, College of Pharmacy, Third Military Medical University (Army Medical University), Chongqing, 400038, China
- State Key Lab of Trauma, Burn and Combined Injury, Third Military Medical University (Army Medical University), Chongqing, 400038, China
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Neumaier F, Zlatopolskiy BD, Neumaier B. Nuclear Medicine in Times of COVID-19: How Radiopharmaceuticals Could Help to Fight the Current and Future Pandemics. Pharmaceutics 2020; 12:E1247. [PMID: 33371500 PMCID: PMC7767508 DOI: 10.3390/pharmaceutics12121247] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 12/15/2020] [Accepted: 12/17/2020] [Indexed: 02/06/2023] Open
Abstract
The emergence and global spread of COVID-19, an infectious disease caused by the novel coronavirus SARS-CoV-2, has resulted in a continuing pandemic threat to global health. Nuclear medicine techniques can be used for functional imaging of (patho)physiological processes at the cellular or molecular level and for treatment approaches based on targeted delivery of therapeutic radionuclides. Ongoing development of radiolabeling methods has significantly improved the accessibility of radiopharmaceuticals for in vivo molecular imaging or targeted radionuclide therapy, but their use for biosafety threats such as SARS-CoV-2 is restricted by the contagious nature of these agents. Here, we highlight several potential uses of nuclear medicine in the context of SARS-CoV-2 and COVID-19, many of which could also be performed in laboratories without dedicated containment measures. In addition, we provide a broad overview of experimental or repurposed SARS-CoV-2-targeting drugs and describe how radiolabeled analogs of these compounds could facilitate antiviral drug development and translation to the clinic, reduce the incidence of late-stage failures and possibly provide the basis for radionuclide-based treatment strategies. Based on the continuing threat by emerging coronaviruses and other pathogens, it is anticipated that these applications of nuclear medicine will become a more important part of future antiviral drug development and treatment.
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Affiliation(s)
- Felix Neumaier
- Forschungszentrum Jülich GmbH, Institute of Neuroscience and Medicine, Nuclear Chemistry (INM-5), Wilhelm-Johnen-Str., 52428 Jülich, Germany; (B.D.Z.); (B.N.)
- Institute of Radiochemistry and Experimental Molecular Imaging, Faculty of Medicine and University Hospital Cologne, University of Cologne, Kerpener Str. 62, 50937 Cologne, Germany
| | - Boris D. Zlatopolskiy
- Forschungszentrum Jülich GmbH, Institute of Neuroscience and Medicine, Nuclear Chemistry (INM-5), Wilhelm-Johnen-Str., 52428 Jülich, Germany; (B.D.Z.); (B.N.)
- Institute of Radiochemistry and Experimental Molecular Imaging, Faculty of Medicine and University Hospital Cologne, University of Cologne, Kerpener Str. 62, 50937 Cologne, Germany
- Max Planck Institute for Metabolism Research, 50931 Cologne, Germany
| | - Bernd Neumaier
- Forschungszentrum Jülich GmbH, Institute of Neuroscience and Medicine, Nuclear Chemistry (INM-5), Wilhelm-Johnen-Str., 52428 Jülich, Germany; (B.D.Z.); (B.N.)
- Institute of Radiochemistry and Experimental Molecular Imaging, Faculty of Medicine and University Hospital Cologne, University of Cologne, Kerpener Str. 62, 50937 Cologne, Germany
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8
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Affiliation(s)
- Xinping Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering Southeast University Nanjing China
| | - Xiaoyang Liu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering Southeast University Nanjing China
| | - Yuxin Guo
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering Southeast University Nanjing China
| | - Fu‐Gen Wu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering Southeast University Nanjing China
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Paul JA, Whittington RA, Baldwin MR. Critical Illness and the Frailty Syndrome: Mechanisms and Potential Therapeutic Targets. Anesth Analg 2020; 130:1545-1555. [PMID: 32384344 DOI: 10.1213/ane.0000000000004792] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Frailty is a syndrome characterized by decreased reserves across multiple physiologic systems resulting in functional limitations and vulnerability to new stressors. Physical frailty develops over years in community-dwelling older adults but presents or worsens within days in the intensive care unit (ICU) because common mechanisms governing age-related physical frailty are often exacerbated by critical illness. The hallmark of physical frailty is a combined loss of muscle mass, force, and endurance. About one-third of ICU patients have frailty before hospitalization, which increases their risk for both short- and long-term disability and mortality. While there are several valid ways to measure clinical frailty in patients before or after an ICU admission, the mechanistic underpinnings of frailty in critically ill patients and ICU survivors have not been thoroughly investigated. Furthermore, therapeutic interventions to treat frailty during and after time in the ICU are lacking. In this narrative review, we examine studies that identify potential biological mechanisms underlying the development and propagation of physical frailty in both aging and critical illness (eg, inflammation, mitochondrial myopathy, and neuroendocrinopathy). We discuss specific aspects of these frailty mechanisms in older adults, critically ill patients, and ICU survivors that may represent therapeutic targets. Consistent with complexity underlying frailty, this syndrome is unlikely to result from an excess of a single harmful mediator or deficit of a single protective mediator. Rather, frailty occurs in the presence of an incompletely understood state of multisystem dysregulation. We further describe knowledge gaps that warrant clinical and translational research in frailty and critical care with an overall goal of developing effective frailty treatments in critically ill patients and ICU survivors.
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Affiliation(s)
- Jonathan A Paul
- From the Department of Anesthesiology, Columbia University Irving Medical Center, New York, New York
| | - Robert A Whittington
- From the Department of Anesthesiology, Columbia University Irving Medical Center, New York, New York
| | - Matthew R Baldwin
- Division of Pulmonary, Allergy, and Critical Care, Department of Internal Medicine, Columbia University Irving Medical Center, New York, New York
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Akram AR, Avlonitis N, Scholefield E, Vendrell M, McDonald N, Aslam T, Craven TH, Gray C, Collie DS, Fisher AJ, Corris PA, Walsh T, Haslett C, Bradley M, Dhaliwal K. Enhanced avidity from a multivalent fluorescent antimicrobial peptide enables pathogen detection in a human lung model. Sci Rep 2019; 9:8422. [PMID: 31182770 PMCID: PMC6557859 DOI: 10.1038/s41598-019-44804-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 05/20/2019] [Indexed: 12/19/2022] Open
Abstract
Rapid in situ detection of pathogens coupled with high resolution imaging in the distal human lung has the potential to provide new insights and diagnostic utility in patients in whom pneumonia is suspected. We have previously described an antimicrobial peptide (AMP) Ubiquicidin (fragment UBI29-41) labelled with an environmentally sensitive fluorophore that optically detected bacteria in vitro but not ex vivo. Here, we describe further chemical development of this compound and demonstrate that altering the secondary structure of the AMP to generate a tri-branched dendrimeric scaffold provides enhanced signal in vitro and ex vivo and consequently allows the rapid detection of pathogens in situ in an explanted human lung. This compound (NBD-UBIdend) demonstrates bacterial labelling specificity for a broad panel of pathogenic bacteria and Aspergillus fumigatus. NBD-UBIdend demonstrated high signal-to-noise fluorescence amplification upon target engagement, did not label host mammalian cells and was non-toxic and chemically robust within the inflamed biological environment. Intrapulmonary delivery of NBD-UBIdend, coupled with optical endomicroscopy demonstrated real-time, in situ detection of bacteria in explanted whole human Cystic Fibrosis lungs.
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Affiliation(s)
- Ahsan R Akram
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom.
| | - Nicolaos Avlonitis
- EaStCHEM, The University of Edinburgh School of Chemistry, Joseph Black Building, West Mains Road, EH9 3FJ, Edinburgh, United Kingdom
| | - Emma Scholefield
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Marc Vendrell
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Neil McDonald
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Tashfeen Aslam
- EaStCHEM, The University of Edinburgh School of Chemistry, Joseph Black Building, West Mains Road, EH9 3FJ, Edinburgh, United Kingdom
| | - Thomas H Craven
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Calum Gray
- Clinical Research Imaging Centre, Queen's Medical Research Institute, Edinburgh BioQuarter, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - David S Collie
- The Roslin Institute and R(D)SVS, The University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian, United Kingdom
| | - Andrew J Fisher
- Institute of Transplantation, Newcastle University, Freeman Hospital, High Heaton, Newcastle upon Tyne, NE7 7DN, United Kingdom
| | - Paul A Corris
- Institute of Transplantation, Newcastle University, Freeman Hospital, High Heaton, Newcastle upon Tyne, NE7 7DN, United Kingdom
| | - Timothy Walsh
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Christopher Haslett
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom
| | - Mark Bradley
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom.
- EaStCHEM, The University of Edinburgh School of Chemistry, Joseph Black Building, West Mains Road, EH9 3FJ, Edinburgh, United Kingdom.
| | - Kevin Dhaliwal
- EPSRC IRC PROTEUS Hub, Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh BioQuarter, 47 Little France Crescent, Edinburgh, EH16 4TJ, United Kingdom.
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12
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Henry MA, Gasco L, Chatzifotis S, Piccolo G. Does dietary insect meal affect the fish immune system? The case of mealworm, Tenebrio molitor on European sea bass, Dicentrarchus labrax. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 81:204-209. [PMID: 29229441 DOI: 10.1016/j.dci.2017.12.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/04/2017] [Accepted: 12/04/2017] [Indexed: 06/07/2023]
Abstract
Feeding small European sea bass, Dicentrarchus labrax, for 6 weeks with Tenebrio molitor larval meal showed significant anti-inflammatory responses (ceruloplasmin, myeloperoxidase and nitric oxide). Serum bacteriolytic activity against a Gram negative bacterium was not significantly affected by dietary Tenebrio, while both lysozyme antibacterial activity and serum trypsin inhibition usually linked to the anti-parasite activity of the fish, were significantly enhanced. The latter may be due to the similarities in the composition of the exoskeleton of parasites and insects that may therefore act as an immunostimulant potentially increasing the anti-parasitic activity. The addition of exogenous proteases significantly decreased both trypsin-inhibition and serum bacteriolytic activity probably through direct inhibition of the proteins responsible for these immune functions. Further investigation involving bacterial or parasitic challenges will be necessary to assess if the effects of dietary mealworm meal on the immune system observed in the present study are translated into an improved resistance to diseases.
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Affiliation(s)
- M A Henry
- Laboratory of Fish Nutrition and Pathology, Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, Aghios Kosmas, 16777 Elliniko, Greece.
| | - L Gasco
- Department of Agricultural, Forest and Food Science, University of Turin, Grugliasco, 10095 Turin, Italy
| | - S Chatzifotis
- Aqualabs, Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, P.O.Box 2214, Iraklion, Crete 71003, Greece
| | - G Piccolo
- Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, Via F. Delpino 1, 80137 Naples, Italy
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Wiehr S, Warnke P, Rolle AM, Schütz M, Oberhettinger P, Kohlhofer U, Quintanilla-Martinez L, Maurer A, Thornton C, Boschetti F, Reischl G, Autenrieth IB, Pichler BJ, Autenrieth SE. New pathogen-specific immunoPET/MR tracer for molecular imaging of a systemic bacterial infection. Oncotarget 2017; 7:10990-1001. [PMID: 26934329 PMCID: PMC4905453 DOI: 10.18632/oncotarget.7770] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 02/20/2016] [Indexed: 01/12/2023] Open
Abstract
The specific and rapid detection of Enterobacteriaceae, the most frequent cause of gram-negative bacterial infections in humans, remains a major challenge. We developed a non-invasive method to rapidly detect systemic Yersinia enterocolitica infections using immunoPET (antibody-targeted positron emission tomography) with [64Cu]NODAGA-labeled Yersinia-specific polyclonal antibodies targeting the outer membrane protein YadA. In contrast to the tracer [18F]FDG, [64Cu]NODAGA-YadA uptake co-localized in a dose dependent manner with bacterial lesions of Yersinia-infected mice, as detected by magnetic resonance (MR) imaging. This was accompanied by elevated uptake of [64Cu]NODAGA-YadA in infected tissues, in ex vivo biodistribution studies, whereas reduced uptake was observed following blocking with unlabeled anti-YadA antibody. We show, for the first time, a bacteria-specific, antibody-based, in vivo imaging method for the diagnosis of a Gram-negative enterobacterial infection as a proof of concept, which may provide new insights into pathogen-host interactions.
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Affiliation(s)
- Stefan Wiehr
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Philipp Warnke
- Institute of Medical Microbiology and Hygiene, Eberhard Karls University, Tübingen, Germany.,Institute of Medical Microbiology, Virology and Hygiene, Rostock University Hospital, Rostock, Germany
| | - Anna-Maria Rolle
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Monika Schütz
- Institute of Medical Microbiology and Hygiene, Eberhard Karls University, Tübingen, Germany
| | - Philipp Oberhettinger
- Institute of Medical Microbiology and Hygiene, Eberhard Karls University, Tübingen, Germany
| | - Ursula Kohlhofer
- Institute of Pathology, Eberhard Karls University Tübingen, Tübingen, Germany
| | | | - Andreas Maurer
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Christopher Thornton
- Biosciences and ISCA Diagnostics Ltd., University of Exeter, Exeter, United Kingdom
| | | | - Gerald Reischl
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Ingo B Autenrieth
- Institute of Medical Microbiology and Hygiene, Eberhard Karls University, Tübingen, Germany
| | - Bernd J Pichler
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Stella E Autenrieth
- Department of Internal Medicine II, University Hospital Tübingen, Tübingen, Germany
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14
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Stone JM, Wood HAC, Harrington K, Birks TA. Low index contrast imaging fibers. OPTICS LETTERS 2017; 42:1484-1487. [PMID: 28409795 DOI: 10.1364/ol.42.001484] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present high-resolution imaging fibers made from low-cost commercially available fiber preforms manufactured for the telecommunications industry. Our fabrication method involves multi-stacking arrays of different sized cores in order to suppress core-to-core crosstalk whilst building up a large array of cores. One of the fibers, based on a square array of cores, has comparable imaging performance to commercial imaging fibers but without the need for exceptionally high refractive index contrasts, and will enable the development of economically viable single-use disposable imaging fibers.
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15
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Progress does not just come in giant leaps: adapting techniques for the study of inflammation to novel applications. Inflamm Res 2016; 66:1-12. [PMID: 27682578 DOI: 10.1007/s00011-016-0988-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 08/25/2016] [Indexed: 10/20/2022] Open
Abstract
INTRODUCTION Discussion of the relevance of suitable experimental models for the effective translation of drug effects to clinical inflammatory diseases has a long history. Much emphasis is placed these days on genetically transformed mice, which may have developmental drawbacks. But are established models redundant? FINDINGS Drawn from personal experience, examples are provided of the success of tinkering with technology in the context of inflammation. These include the use of specific dietary deficiency conditions, the development of new applications for established drugs and the introduction of a variety of readouts to assess outcome in studies on established disease models. Such approaches have been used to demonstrate inflammation-modulating effects of prostaglandin E, in the development of ebselen, for the introduction of immunomodulatory macrolide drugs and in new approaches to the therapy of multiple sclerosis. CONCLUSION Fine tuning of experimental approaches and evaluation technologies can often still provide innovative, clinically relevant insights into the potential beneficial effects of drugs and pharmacological agents.
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Krstajic N, Akram AR, Choudhary TR, McDonald N, Tanner MG, Pedretti E, Dalgarno PA, Scholefield E, Girkin JM, Moore A, Bradley M, Dhaliwal K. Two-color widefield fluorescence microendoscopy enables multiplexed molecular imaging in the alveolar space of human lung tissue. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:46009. [PMID: 27121475 DOI: 10.1117/1.jbo.21.4.046009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 03/24/2016] [Indexed: 05/20/2023]
Abstract
We demonstrate a fast two-color widefield fluorescence microendoscopy system capable of simultaneously detecting several disease targets in intact human ex vivo lung tissue. We characterize the system for light throughput from the excitation light emitting diodes, fluorescence collection efficiency, and chromatic focal shifts. We demonstrate the effectiveness of the instrument by imaging bacteria (Pseudomonas aeruginosa) in ex vivo human lung tissue. We describe a mechanism of bacterial detection through the fiber bundle that uses blinking effects of bacteria as they move in front of the fiber core providing detection of objects smaller than the fiber core and cladding (∼3 μm ∼3 μm ). This effectively increases the measured spatial resolution of 4 μm 4 μm . We show simultaneous imaging of neutrophils, monocytes, and fungus (Aspergillus fumigatus) in ex vivo human lung tissue. The instrument has 10 nM and 50 nM sensitivity for fluorescein and Cy5 solutions, respectively. Lung tissue autofluorescence remains visible at up to 200 fps camera acquisition rate. The optical system lends itself to clinical translation due to high-fluorescence sensitivity, simplicity, and the ability to multiplex several pathological molecular imaging targets simultaneously.
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Affiliation(s)
- Nikola Krstajic
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdombUniversity of Edinburgh, School of E
| | - Ahsan R Akram
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Tushar R Choudhary
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdomcHeriot-Watt University, Institute of
| | - Neil McDonald
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Michael G Tanner
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdomdHeriot-Watt University, Institute of
| | - Ettore Pedretti
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdomcHeriot-Watt University, Institute of
| | - Paul A Dalgarno
- Heriot-Watt University, Institute of Biological Chemistry, Biophysics and Bioengineering, Edinburgh EH14 4AS, United Kingdom
| | - Emma Scholefield
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - John M Girkin
- Durham University, Biophysical Sciences Institute, Department of Physics, South Road, Durham DH1 3LE, United Kingdom
| | - Anne Moore
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Mark Bradley
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Kevin Dhaliwal
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
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Li J, Zhang Y, Chordia MD, Wu H, Shao L, Pan D. Multimodal formyl peptide receptor 1 targeted inflammation imaging probe: cFLFLF-MHI-DOTA. Bioorg Med Chem Lett 2016; 26:1052-1055. [DOI: 10.1016/j.bmcl.2015.12.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 12/03/2015] [Accepted: 12/10/2015] [Indexed: 01/08/2023]
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18
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Akram AR, Avlonitis N, Lilienkampf A, Perez-Lopez AM, McDonald N, Chankeshwara SV, Scholefield E, Haslett C, Bradley M, Dhaliwal K. A labelled-ubiquicidin antimicrobial peptide for immediate in situ optical detection of live bacteria in human alveolar lung tissue. Chem Sci 2015; 6:6971-6979. [PMID: 29861935 PMCID: PMC5947527 DOI: 10.1039/c5sc00960j] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/26/2015] [Indexed: 02/02/2023] Open
Abstract
The in situ immediate detection of the presence of bacteria in the distal human lung is of significant clinical utility. Herein we describe the development and optimization of a bacterial binding fragment (UBI29-41) of the antimicrobial peptide, ubiquicidin (UBI), conjugated to an environmentally sensitive fluorophore to enable rapid live bacterial imaging within human lung tissue. UBI29-41 was modified for stability in the presence of human lung bronchoalveolar lavage fluid, for affinity to bacterial membranes and functionality in human lung tissue. The optimized cyclic structure yields an optical molecular Smartprobe for bacterial detection in human lung tissue.
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Affiliation(s)
- Ahsan R Akram
- Pulmonary Optical Molecular Imaging Group , MRC Centre for Inflammation Research , Queen's Medical Research Institute , 47 Little France Crescent , Edinburgh , EH16 4TJ , UK .
| | - Nicolaos Avlonitis
- EaStCHEM , The University of Edinburgh School of Chemistry , Joseph Black Building, West Mains Road , Edinburgh EH9 3FJ , UK .
| | - Annamaria Lilienkampf
- EaStCHEM , The University of Edinburgh School of Chemistry , Joseph Black Building, West Mains Road , Edinburgh EH9 3FJ , UK .
| | - Ana M Perez-Lopez
- EaStCHEM , The University of Edinburgh School of Chemistry , Joseph Black Building, West Mains Road , Edinburgh EH9 3FJ , UK .
| | - Neil McDonald
- Pulmonary Optical Molecular Imaging Group , MRC Centre for Inflammation Research , Queen's Medical Research Institute , 47 Little France Crescent , Edinburgh , EH16 4TJ , UK .
| | - Sunay V Chankeshwara
- EaStCHEM , The University of Edinburgh School of Chemistry , Joseph Black Building, West Mains Road , Edinburgh EH9 3FJ , UK .
| | - Emma Scholefield
- Pulmonary Optical Molecular Imaging Group , MRC Centre for Inflammation Research , Queen's Medical Research Institute , 47 Little France Crescent , Edinburgh , EH16 4TJ , UK .
| | - Christopher Haslett
- Pulmonary Optical Molecular Imaging Group , MRC Centre for Inflammation Research , Queen's Medical Research Institute , 47 Little France Crescent , Edinburgh , EH16 4TJ , UK .
| | - Mark Bradley
- EaStCHEM , The University of Edinburgh School of Chemistry , Joseph Black Building, West Mains Road , Edinburgh EH9 3FJ , UK .
| | - Kevin Dhaliwal
- Pulmonary Optical Molecular Imaging Group , MRC Centre for Inflammation Research , Queen's Medical Research Institute , 47 Little France Crescent , Edinburgh , EH16 4TJ , UK .
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19
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Bocan TM, Panchal RG, Bavari S. Applications of in vivo imaging in the evaluation of the pathophysiology of viral and bacterial infections and in development of countermeasures to BSL3/4 pathogens. Mol Imaging Biol 2015; 17:4-17. [PMID: 25008802 PMCID: PMC4544652 DOI: 10.1007/s11307-014-0759-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
While preclinical and clinical imaging have been applied to drug discovery/development and characterization of disease pathology, few examples exist where imaging has been used to evaluate infectious agents or countermeasures to biosafety level (BSL)3/4 threat agents. Viruses engineered with reporter constructs, i.e., enzymes and receptors, which are amenable to detection by positron emission tomography (PET), single photon emission tomography (SPECT), or magnetic resonance imaging (MRI) have been used to evaluate the biodistribution of viruses containing specific therapeutic or gene transfer payloads. Bioluminescence and nuclear approaches involving engineered reporters, direct labeling of bacteria with radiotracers, or tracking bacteria through their constitutively expressed thymidine kinase have been utilized to characterize viral and bacterial pathogens post-infection. Most PET, SPECT, CT, or MRI approaches have focused on evaluating host responses to the pathogens such as inflammation, brain neurochemistry, and structural changes and on assessing the biodistribution of radiolabeled drugs. Imaging has the potential when applied preclinically to the development of countermeasures against BSL3/4 threat agents to address the following: (1) presence, biodistribution, and time course of infection in the presence or absence of drug; (2) binding of the therapeutic to the target; and (3) expression of a pharmacologic effect either related to drug mechanism, efficacy, or safety. Preclinical imaging could potentially provide real-time dynamic tools to characterize the pathogen and animal model and for developing countermeasures under the U.S. FDA Animal Rule provision with high confidence of success and clinical benefit.
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Affiliation(s)
- Thomas M Bocan
- Molecular and Translational Sciences, US Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Ft. Detrick, MD, 21702, USA,
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20
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Aslam T, Miele A, Chankeshwara SV, Megia-Fernandez A, Michels C, Akram AR, McDonald N, Hirani N, Haslett C, Bradley M, Dhaliwal K. Optical molecular imaging of lysyl oxidase activity - detection of active fibrogenesis in human lung tissue. Chem Sci 2015; 6:4946-4953. [PMID: 30155003 PMCID: PMC6088439 DOI: 10.1039/c5sc01258a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 06/08/2015] [Indexed: 12/17/2022] Open
Abstract
A fluorogenic probe provides real-time measurement of lysyl oxidase activity in ex vivo asinine and human lung tissue.
Aberrant fibrogenesis is a feature of many diseases in multiple organ systems. The lysyl oxidase family of enzymes are central to tissue homeostasis and elevated lysyl oxidase activity is implicated in fibroproliferation as well as in cancer stroma. We have synthesised a novel fluorogenic reporter for monitoring lysyl oxidase activity that generates a 3–5 fold increase in fluorescence following probe activation in ventilating fibrotic ex vivo asinine lung and ex vivo human lung tissue. The probe termed “oLOX” can provide real-time measurement of lysyl oxidase activity in a number of biological settings and is tractable from an in vitro setting to man.
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Affiliation(s)
- Tashfeen Aslam
- School of Chemistry , EaStChem , University of Edinburgh , Joseph Black Building, West Mains Road , Edinburgh , EH9 3FJ , UK .
| | - Amy Miele
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
| | - Sunay V Chankeshwara
- School of Chemistry , EaStChem , University of Edinburgh , Joseph Black Building, West Mains Road , Edinburgh , EH9 3FJ , UK .
| | - Alicia Megia-Fernandez
- School of Chemistry , EaStChem , University of Edinburgh , Joseph Black Building, West Mains Road , Edinburgh , EH9 3FJ , UK .
| | - Chesney Michels
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
| | - Ahsan R Akram
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
| | - Neil McDonald
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
| | - Nik Hirani
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
| | - Chris Haslett
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
| | - Mark Bradley
- School of Chemistry , EaStChem , University of Edinburgh , Joseph Black Building, West Mains Road , Edinburgh , EH9 3FJ , UK .
| | - Kevin Dhaliwal
- Pulmonary Optical Molecular Imaging Group , MRC/Centre of Inflammation Research , Queen's Medical Research Institute , University of Edinburgh , 47 Little France Crescent , EH16 4TJ , Edinburgh , UK .
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21
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Manukyan G, Aminov R, Hakobyan G, Davtyan T. Accelerated apoptosis of neutrophils in familial mediterranean Fever. Front Immunol 2015; 6:239. [PMID: 26042122 PMCID: PMC4435041 DOI: 10.3389/fimmu.2015.00239] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 05/04/2015] [Indexed: 12/11/2022] Open
Abstract
The causative mutations for familial Mediterranean fever (FMF) are located in the MEFV gene, which encodes pyrin. Pyrin modulates the susceptibility to apoptosis via its PYD domain, but how the mutated versions of pyrin affect apoptotic processes are poorly understood. Spontaneous and induced rates of systemic neutrophil apoptosis as well as the levels of proteins involved in apoptosis were investigated ex vivo in patients with FMF using flow cytometry and RT-qPCR. The freshly collected neutrophils from the patients in FMF remission displayed a significantly larger number of cells spontaneously entering apoptosis compared to control (6.27 ± 2.14 vs. 1.69 ± 0.18%). This elevated ratio was retained after 24 h incubation of neutrophils in the growth medium (32.4 ± 7.41 vs. 7.65 ± 1.32%). Correspondingly, the mRNA level for caspase-3 was also significantly increased under these conditions. In response to the inducing agents, the neutrophils from FMF patients also displayed significantly elevated apoptotic rates compared to control. The elevated rates, however, can be largely explained by the higher basal ratio of apoptotic cells in the former group. Monitoring of several proteins involved in apoptosis has not revealed any conventional mechanisms contributing to the enhanced apoptotic rate of neutrophils in FMF. Although the exact molecular mechanisms of accelerated neutrophil apoptosis in FMF remain unknown, it may provide a protection against excessive inflammation and tissue damage due to a massive infiltration of neutrophils in the acute period of the disease.
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Affiliation(s)
- Gayane Manukyan
- Group of Molecular and Cellular Immunology, Institute of Molecular Biology, National Academy of Sciences , Yerevan , Armenia
| | - Rustam Aminov
- National Veterinary Institute, Technical University of Denmark , Copenhagen , Denmark
| | - Gagik Hakobyan
- Department of Internal Medicine, Yerevan State Medical University , Yerevan , Armenia
| | - Tigran Davtyan
- Analytical Laboratory Branch, Scientific Centre of Drug and Medical Technology Expertise JSC , Yerevan , Armenia
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22
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Recognition of Immune Response for the Early Diagnosis and Treatment of Osteoarthritis. J Immunol Res 2015; 2015:192415. [PMID: 26064995 PMCID: PMC4433702 DOI: 10.1155/2015/192415] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/02/2014] [Indexed: 12/15/2022] Open
Abstract
Osteoarthritis is a common and debilitating joint disease that affects up to 30 million Americans, leading to significant disability, reduction in quality of life, and costing the United States tens of billions of dollars annually. Classically, osteoarthritis has been characterized as a degenerative, wear-and-tear disease, but recent research has identified it as an immunopathological disease on a spectrum between healthy condition and rheumatoid arthritis. A systematic literature review demonstrates that the disease pathogenesis is driven by an early innate immune response which progressively catalyzes degenerative changes that ultimately lead to an altered joint microenvironment. It is feasible to detect this infiltration of cells in the early, and presumably asymptomatic, phase of the disease through noninvasive imaging techniques. This screening can serve to aid clinicians in potentially identifying high-risk patients, hopefully leading to early effective management, vast improvements in quality of life, and significant reductions in disability, morbidity, and cost related to osteoarthritis. Although the diagnosis and treatment of osteoarthritis routinely utilize both invasive and non-invasive strategies, imaging techniques specific to inflammatory cells are not commonly employed for these purposes. This review discusses this paradigm and aims to shift the focus of future osteoarthritis-related research towards early diagnosis of the disease process.
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Abstract
Significant progress in our understanding of Crohn's disease (CD), an archetypal common, complex disease, has now been achieved. Our ability to interrogate the deep complexities of the biological processes involved in maintaining gut mucosal homeostasis is a major over-riding factor underpinning this rapid progress. Key studies now offer many novel and expansive insights into the interacting roles of genetic susceptibility, immune function, and the gut microbiota in CD. Here, we provide overviews of these recent advances and new mechanistic themes, and address the challenges and prospects for translation from concept to clinic.
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Affiliation(s)
- Ray Boyapati
- Centre for Inflammation Research, Queens Medical Research Institute, University of EdinburghEdinburgh, EH16 4TJUK
- Gastrointestinal Unit, Institute of Genetics and Molecular Medicine, Western General HospitalEdinburgh, EH4 2XUUK
| | - Jack Satsangi
- Centre for Inflammation Research, Queens Medical Research Institute, University of EdinburghEdinburgh, EH16 4TJUK
- Gastrointestinal Unit, Institute of Genetics and Molecular Medicine, Western General HospitalEdinburgh, EH4 2XUUK
| | - Gwo-Tzer Ho
- Centre for Inflammation Research, Queens Medical Research Institute, University of EdinburghEdinburgh, EH16 4TJUK
- Gastrointestinal Unit, Institute of Genetics and Molecular Medicine, Western General HospitalEdinburgh, EH4 2XUUK
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24
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Synthesis of chlorinated flavonoids with anti-inflammatory and pro-apoptotic activities in human neutrophils. Eur J Med Chem 2014; 86:153-64. [DOI: 10.1016/j.ejmech.2014.08.035] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 08/08/2014] [Accepted: 08/09/2014] [Indexed: 12/11/2022]
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25
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Abstract
Timely neutrophil apoptosis and cell clearance by surrounding phagocytes are essential components of the resolution phase of acute inflammation. Programmed cell death by apoptosis occurs with maintenance of an intact cell membrane in order to prevent the release of histotoxic intracellular products such as proteases and reactive oxidant species into the extracellular surroundings as occurs during necrosis. Macrophage phagocytosis results in attenuation of toll-like receptor-driven proinflammatory mediator production further promoting inflammation resolution. Failures in this cascade of events can result in tissue damage, chronic inflammation and disease. By studying human neutrophil apoptosis and phagocytic clearance in vitro, it is possible to delineate key control mechanisms in the regulation of these processes and therefore also identify potential therapeutic targets. Apoptotic signalling pathways are well described in the literature using a variety of laboratory techniques. In this paper, we outline the key in vitro assays used to assess neutrophil apoptosis, activation of key components of the apoptotic machinery, and phagocytic clearance of these cells.
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Bruijnen STG, Gent YYJ, Voskuyl AE, Hoekstra OS, van der Laken CJ. Present Role of Positron Emission Tomography in the Diagnosis and Monitoring of Peripheral Inflammatory Arthritis: A Systematic Review. Arthritis Care Res (Hoboken) 2013; 66:120-30. [DOI: 10.1002/acr.22184] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 09/17/2013] [Indexed: 01/28/2023]
Affiliation(s)
| | - Y. Y. J. Gent
- VU University Medical Center; Amsterdam The Netherlands
| | - A. E. Voskuyl
- VU University Medical Center; Amsterdam The Netherlands
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27
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Qiu Y, Palankar R, Echeverría M, Medvedev N, Moya SE, Delcea M. Design of hybrid multimodal poly(lactic-co-glycolic acid) polymer nanoparticles for neutrophil labeling, imaging and tracking. NANOSCALE 2013; 5:12624-12632. [PMID: 24177321 DOI: 10.1039/c3nr04013e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) incorporating quantum dots (QDs), superparamagnetic iron oxide nanoparticles (SPIONs) and gold (Au) NPs for neutrophil labeling were fabricated via the w/o/w double emulsion method. QDs and SPIONs were entrapped in the PLGA core during emulsification while Au NPs were assembled on top of the PLGA NPs via electrostatic interactions. Transmission Electron Microscopy, Scanning Electron Microscopy and Confocal Scanning Laser Microscopy (CLSM) were applied to characterize the hybrid PLGA NPs. The uptake of the hybrid PLGA NPs by human neutrophils was studied by Flow Cytometry and confocal microscopy. In addition, the induction of reactive oxygen species (ROS) in neutrophils after incubation with the hybrid PLGA NPs was assessed. Magnetophoresis experiments showed that neutrophils with internalized hybrid PLGA NPs can be effectively laterally displaced towards the magnetic field. Magnetic Resonance Imaging of the hybrid PLGA NPs resulted in images with a contrast enhancement linearly dependent on the concentration of the hybrid PLGA NPs. Research reported in this work is relevant for imaging, tracking and manipulating neutrophils and has potential for in vivo applications, e.g., tumor visualization and localized photothermal treatment.
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Affiliation(s)
- Yuan Qiu
- CIC biomaGUNE, Biosurfaces, Paseo Miramon 182 C, 20009 San Sebastian, Spain.
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28
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Bunschoten A, Welling MM, Termaat MF, Sathekge M, van Leeuwen FWB. Development and Prospects of Dedicated Tracers for the Molecular Imaging of Bacterial Infections. Bioconjug Chem 2013; 24:1971-89. [DOI: 10.1021/bc4003037] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- A. Bunschoten
- Department
of Radiology, Interventional Molecular Imaging Laboratory, Leiden University Medical Center, Leiden, The Netherlands
| | - M. M. Welling
- Department
of Radiology, Interventional Molecular Imaging Laboratory, Leiden University Medical Center, Leiden, The Netherlands
| | - M. F. Termaat
- Department
of Trauma Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | - M. Sathekge
- Department of Nuclear Medicine, University of Pretoria & Steve Biko Academic Hospital, Pretoria, South Africa
| | - F. W. B. van Leeuwen
- Department
of Radiology, Interventional Molecular Imaging Laboratory, Leiden University Medical Center, Leiden, The Netherlands
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29
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Wang TT, Song XH, Bao GM, Zhao LX, Yu X, Zhao J. Molecular characterization, expression analysis, and biological effects of interleukin-8 in grass carp Ctenopharyngodon idellus. FISH & SHELLFISH IMMUNOLOGY 2013; 35:1421-1432. [PMID: 23994423 DOI: 10.1016/j.fsi.2013.08.006] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Revised: 08/05/2013] [Accepted: 08/08/2013] [Indexed: 06/02/2023]
Abstract
Interleukin-8 (IL-8) is a CXC chemokine that plays key regulatory roles in the immune and inflammatory responses implicated in many human diseases. In this study, we identified and characterized an IL-8 homologue from the grass carp, Ctenopharyngodon idellus. A sequence alignment of the full-length cDNA and genomic DNA showed that the exon/intron organization of grass carp IL-8 (gcIL-8) is identical to those of other known CXC chemokine genes. A multiple alignment analysis showed that gcIL-8 is an ELR(-)CXC chemokine, and its deduced amino acid sequence shares 81% and 36% identity with common carp IL-8s L1 (GenBank ID: ABE47600) and L2 (GenBank ID: AB470924), respectively, suggesting that it belongs to the lineage 1 group of fish IL-8 proteins. On a phylogenetic tree, gcIL-8 clustered with other teleost IL-8 proteins to form a fish-specific clade, clearly distinct from those of bird, mammal, and amphibian proteins. Real-time quantitative PCR analysis indicated that gcIL-8 is differentially expressed in various tissues under normal conditions and that the expression of gcIL-8 mRNA in immune-related tissues is clearly upregulated by Aeromonas hydrophila infection. To explore the biological effects of gcIL-8, we produced a recombinant protein, rgcIL-8, in a prokaryotic expression system. Purified rgcIL-8 was confirmed to be chemoattractive for head kidney neutrophils and mononuclear leukocytes in vitro. Our histopathological study also revealed that rgcIL-8 exerts proinflammatory effects by inducing neutrophil infiltration and erythrocyte extravasation. Overall, these results suggest that IL-8 is crucially involved in the inflammatory responses of fish.
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Affiliation(s)
- Ting-Ting Wang
- Department of Hydrobiology, School of Biology and Basic Medical Sciences, Soochow University, 199 Ren'ai Road, Suzhou, Jiangsu 215123, China
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30
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Maskrey BH, Megson IL, Rossi AG, Whitfield PD. Emerging importance of omega-3 fatty acids in the innate immune response: molecular mechanisms and lipidomic strategies for their analysis. Mol Nutr Food Res 2013; 57:1390-400. [PMID: 23417926 DOI: 10.1002/mnfr.201200723] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Revised: 12/12/2012] [Accepted: 12/12/2012] [Indexed: 12/22/2022]
Abstract
The beneficial health properties of dietary omega-3 polyunsaturated fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have long been known and their metabolic dysfunction has been linked to a range of diseases including various inflammatory disorders, cardiovascular diseases, and cancer. However, the molecular mechanisms underlying their health benefits have remained unclear. Recent technological advances in lipidomic analytical strategies have resulted in the discovery of a range of bioactive mediators derived from EPA and DHA that possess potent anti-inflammatory and pro-resolving properties and that may be responsible, at least in part, for the beneficial effects observed. These mediators include resolvins, protectins and maresins, as well as EPA derivatives of classical arachidonic acid derived eicosanoids, such as prostaglandin E3 . The aim of this review is to provide an overview of the biosynthetic pathways and biological properties of these omega-3 mediators, with a particular focus on the emerging importance of the counter-regulatory role of omega-3 and -6 fatty acids in the spatial and temporal regulation of the inflammatory response. It will also provide an insight into a range of lipidomic approaches, which are currently available to analyse these fatty acids and their metabolites in biological matrices.
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Affiliation(s)
- Benjamin H Maskrey
- Lipidomics Research Facility, Department of Diabetes and Cardiovascular Science, University of the Highlands and Islands, Inverness, UK.
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31
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Dorward DA, Lucas CD, Alessandri AL, Marwick JA, Rossi F, Dransfield I, Haslett C, Dhaliwal K, Rossi AG. Technical advance: autofluorescence-based sorting: rapid and nonperturbing isolation of ultrapure neutrophils to determine cytokine production. J Leukoc Biol 2013; 94:193-202. [PMID: 23667167 PMCID: PMC3685014 DOI: 10.1189/jlb.0113040] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 03/22/2013] [Accepted: 03/30/2013] [Indexed: 12/01/2022] Open
Abstract
The technical limitations of isolating neutrophils without contaminating leukocytes, while concurrently minimizing neutrophil activation, is a barrier to determining specific neutrophil functions. We aimed to assess the use of FACS for generating highly pure quiescent neutrophil populations in an antibody-free environment. Peripheral blood human granulocytes and murine bone marrow-derived neutrophils were isolated by discontinuous Percoll gradient and flow-sorted using FSC/SSC profiles and differences in autofluorescence. Postsort purity was assessed by morphological analysis and flow cytometry. Neutrophil activation was measured in unstimulated-unsorted and sorted cells and in response to fMLF, LTB4, and PAF by measuring shape change, CD62L, and CD11b expression; intracellular calcium flux; and chemotaxis. Cytokine production by human neutrophils was also determined. Postsort human neutrophil purity was 99.95% (sem=0.03; n=11; morphological analysis), and 99.68% were CD16(+ve) (sem=0.06; n=11), with similar results achieved for murine neutrophils. Flow sorting did not alter neutrophil activation or chemotaxis, relative to presorted cells, and no differences in response to agonists were observed. Stimulated neutrophils produced IL-1β, although to a lesser degree than CXCL8/IL-8. The exploitation of the difference in autofluorescence between neutrophils and eosinophils by FACS is a quick and effective method for generating highly purified populations for subsequent in vitro study.
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Affiliation(s)
- David A Dorward
- Queen's Medical Research Institute, 47 Little France Crescent, Edinburgh EH16 4TJ, UK.
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32
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Affiliation(s)
- Adriano G Rossi
- MRC Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, 47, Little France Crescent, Edinburgh, EH16 4TJ Scotland, UK.
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33
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Lucas CD, Allen KC, Dorward DA, Hoodless LJ, Melrose LA, Marwick JA, Tucker CS, Haslett C, Duffin R, Rossi AG. Flavones induce neutrophil apoptosis by down-regulation of Mcl-1 via a proteasomal-dependent pathway. FASEB J 2012. [PMID: 23195034 PMCID: PMC3574292 DOI: 10.1096/fj.12-218990] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Neutrophil apoptosis and subsequent nonphlogistic clearance by surrounding phagocytes are key to the successful resolution of neutrophilic inflammation, with dysregulated apoptosis reported in multiple human inflammatory diseases. Enhancing neutrophil apoptosis has proresolution and anti-inflammatory effects in preclinical models of inflammation. Here we investigate the ability of the flavones apigenin, luteolin, and wogonin to induce neutrophil apoptosis in vitro and resolve neutrophilic inflammation in vivo. Human neutrophil apoptosis was assessed morphologically and by flow cytometry following incubation with apigenin, luteolin, and wogonin. All three flavones induced time- and concentration-dependent neutrophil apoptosis (apigenin, EC50=12.2 μM; luteolin, EC50=14.6 μM; and wogonin, EC50=28.9 μM). Induction of apoptosis was caspase dependent, as it was blocked by the broad-spectrum caspase inhibitor Q-VD-OPh and was associated with both caspase-3 and caspase-9 activation. Flavone-induced apoptosis was preceded by down-regulation of the prosurvival protein Mcl-1, with proteasomal inhibition preventing flavone-induced Mcl-1 down-regulation and apoptosis. The flavones abrogated the survival effects of mediators that prolong neutrophil life span, including lipoteichoic acid, peptidoglycan, dexamethasone, and granulocyte-macrophage colony stimulating factor, by driving apoptosis. Furthermore, wogonin enhanced resolution of established neutrophilic inflammation in a zebrafish model of sterile tissue injury. Wogonin-induced resolution was dependent on apoptosis in vivo as it was blocked by caspase inhibition. Our data show that the flavones induce neutrophil apoptosis and have potential as neutrophil apoptosis-inducing anti-inflammatory, proresolution agents.—Lucas, C. D., Allen, K. C., Dorward, D. A., Hoodless, L. J., Melrose, L. A., Marwick, J. A., Tucker, C. S., Haslett, C., Duffin, R., Rossi, A. G. Flavones induce neutrophil apoptosis by down-regulation of Mcl-1 via a proteasomal-dependent pathway.
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Affiliation(s)
- Christopher D Lucas
- MRC Centre for Inflammation Research, The Queen's Medical Research Institute, University of Edinburgh Medical School, 47 Little France Crescent, Edinburgh, Scotland, UK.
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