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Macrophage pet

Axel Van Der Gucht, Mehdi Aoun Sebaiti, Eric Guedj, Jessie Aouizerate, Sabrina Yara, Romain Gherardi, Eva Evangelista, Julia Chalaye, Anne-Ségolène Cottereau, Antoine Verger, Anne-Catherine Bachoud-Levi, Emmanuel Itti, Francois Jerome Authier
PURPOSE: Macrophagic myofasciitis (MMF) is an emerging condition with specific muscle lesions characterized by an abnormal long-term persistence of aluminum hydroxide particles within macrophages at the site of previous immunization. Patients present with diffuse arthromyalgias, chronic fatigue, and cognitive dysfunction. The aim of this study was to characterize brain FDG-PET metabolic abnormalities in MMF patients, and the relation with cognitive dysfunction. METHODS: FDG-PET brain imaging and a comprehensive battery of neuropsychological tests were performed in 100 consecutive MMF patients (mean age, 45...
October 20, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Yi Rang Na, Gyo Jung Gu, Daun Jung, Young Won Kim, Juri Na, Jin Sun Woo, Joo Youn Cho, Hyewon Youn, Seung Hyeok Seok
GM-CSF induces proinflammatory macrophages, but the underlying mechanisms have not been studied thus far. In this study, we investigated the mechanisms of how GM-CSF induces inflammatory macrophages. First, we observed that GM-CSF increased the extent of LPS-induced acute glycolysis in murine bone marrow-derived macrophages. This directly correlates with an inflammatory phenotype because glycolysis inhibition by 2-deoxyglucose abolished GM-CSF-mediated increase of TNF-α, IL-1β, IL-6, and IL-12p70 synthesis upon LPS stimulation...
October 14, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
Johanna M U Silvola, Helena Virtanen, Riikka Siitonen, Sanna Hellberg, Heidi Liljenbäck, Olli Metsälä, Mia Ståhle, Tiina Saanijoki, Meeri Käkelä, Harri Hakovirta, Seppo Ylä-Herttuala, Pekka Saukko, Matti Jauhiainen, Tibor Z Veres, Sirpa Jalkanen, Juhani Knuuti, Antti Saraste, Anne Roivainen
Given the important role of inflammation and the potential association of the leukocyte trafficking-associated adhesion molecule vascular adhesion protein 1 (VAP-1) with atherosclerosis, this study examined whether functional VAP-1 is expressed in atherosclerotic lesions and, if so, whether it could be targeted by positron emission tomography (PET). First, immunohistochemistry revealed that VAP-1 localized to endothelial cells of intra-plaque neovessels in human carotid endarterectomy samples from patients with recent ischemic symptoms...
October 12, 2016: Scientific Reports
Hyunjung Baek, Minsook Ye, Geun-Hyung Kang, Chanju Lee, Gihyun Lee, Da Bin Choi, Jaehoon Jung, Hyunseong Kim, Seonhwa Lee, Jin Su Kim, Hyun-Ju Lee, Insop Shim, Jun-Ho Lee, Hyunsu Bae
Alzheimer's disease patients display neuropathological lesions, including the accumulation of amyloid-beta (Aβ) peptide and neurofibrillary tangles. Although the mechanisms causing the neurodegenerative process are largely unknown, increasing evidence highlights a critical role of immunity in the pathogenesis of Alzheimer's disease. In the present study, we investigated the role of regulatory T cells (Tregs) on Alzheimer's disease progression. First, we explored the effect of Tregs (CD4+CD25+ T cells) and Teffs (CD4+CD25- T cells) in an adoptive transfer model...
October 4, 2016: Oncotarget
Elena Herranz, Costanza Giannì, Céline Louapre, Constantina A Treaba, Sindhuja T Govindarajan, Russell Ouellette, Marco L Loggia, Jacob A Sloane, Nancy Madigan, David Izquierdo-Garcia, Noreen Ward, Gabriel Mangeat, Tobias Granberg, Eric C Klawiter, Ciprian Catana, Jacob M Hooker, Norman Taylor, Carolina Ionete, Revere P Kinkel, Caterina Mainero
Objective In multiple sclerosis (MS), using simultaneous magnetic resonance-positron emission tomography (MR-PET) imaging with (11) C-PBR28, we quantified expression of the 18kDa translocator protein (TSPO), a marker of activated microglia/macrophages, in cortex, cortical lesions, deep gray matter (GM), white matter (WM) lesions and normal-appearing WM (NAWM) to investigate the in vivo pathological and clinical relevance of neuroinflammation. Methods Fifteen secondary-progressive MS (SPMS) and 12 relapsing-remitting MS (RRMS) cases, and 14 matched healthy controls underwent (11) C-PBR28 MR-PET...
September 30, 2016: Annals of Neurology
G S A Boersema, L Utomo, Y Bayon, N Kops, E van der Harst, J F Lange, Y M Bastiaansen-Jenniskens
Macrophages play a key role in the foreign body response. In this study it was investigated whether obesity affects the acute response of macrophages to biomaterials in vitro and whether this response is associated with biomarkers in blood. CD14 (+) monocytes were isolated from blood from obese and age and gender matched lean persons. Monocyte subsets were determined based on CD14 and CD16 on their surface. C-reactive protein (CRP) was measured in peripheral blood. The response of monocyte-derived macrophages to polypropylene (PP), polylactic acid (PLA), polyethylene terephthalate (PET) monofilament, and PET-multifilament (mPET) in culture was based on cytokine production...
December 2016: Biomaterials
Xiang-Guo Li, Cecilia Hagert, Riikka Siitonen, Helena Virtanen, Outi Sareila, Heidi Liljenbäck, Jouni Tuisku, Juhani Knuuti, Jörgen Bergman, Rikard Holmdahl, Anne Roivainen
Recently mannan from Saccharomyces cerevisiae has been shown to be able to induce psoriasis and psoriatic arthritis in mice, and the phenotypes resemble the corresponding human diseases. To investigate the pathological processes, we set out to label mannan with fluorine-18 ((18)F) and study the (18)F-labeled mannan in vitro and in vivo with positron emission tomography (PET). Accordingly, mannan has been transformed into (18)F-fluoromannan with (18)F-bicyclo[6.1.0]nonyne. In mouse aorta, the binding of [(18)F]fluoromannan to the atherosclerotic lesions was clearly visualized and was significantly higher compared to blocking assays (P < 0...
September 8, 2016: ACS Medicinal Chemistry Letters
Xiaoli Xie, Meng Han, Liang Zhang, Laixing Liu, Zuye Gu, Mei Yang, Hongjun Yang
BACKGROUND: Mycobacterium tuberculosis is the major pathogen of tuberculosis, which affects approximately one-third of the world's population. The 6 kDa early secreted antigenic target (ESAT6) and the 10 kDa culture filtrate protein (CFP10), which are secreted by the ESX-1 system in M. tuberculosis, can contribute to mycobacterial virulence. OBJECTIVES: The aim of this study was to research the effects of M. tuberculosis ESAT6-CFP10 protein on macrophages during a host's was first and second exposures to M...
June 2016: Jundishapur Journal of Microbiology
Mitsunori Higuchi, Yuki Owada, Takuya Inoue, Yuzuru Watanabe, Takumi Yamaura, Mitsuro Fukuhara, Takeo Hasegawa, Hiroyuki Suzuki
BACKGROUND: Nivolumab, an immune checkpoint inhibitor, is recently clinically applied to non-small cell lung cancer (NSCLC) treatment, and this causes T cell activation and T cell infiltration to tumor tissue through the blockade of the interaction between programmed cell death 1 (PD-1) and programmed cell death ligand 1 (PD-L1). 18F-fluorodeoxyglucose-positron emission tomography (FDG-PET) sometimes shows false positive because of the recruitment of neutrophils, lymphocytes, and macrophages...
September 5, 2016: World Journal of Surgical Oncology
James T Thackeray, Jens P Bankstahl, Yong Wang, Kai C Wollert, Frank M Bengel
Acute tissue inflammation after myocardial infarction influences healing and remodeling and has been identified as a target for novel therapies. Molecular imaging holds promise for guidance of such therapies. The amino acid (11)C-methionine is a clinically approved agent which is thought to accumulate in macrophages, but not in healthy myocytes. We assessed the suitability of positron emission tomography (PET) with (11)C-methionine for imaging post-MI inflammation, from cell to mouse to man. Uptake assays demonstrated 7-fold higher (11)C-methionine uptake by polarized pro-inflammatory M1 macrophages over anti-inflammatory M2 subtypes (p<0...
2016: Theranostics
Nienke Grotenhuis, Samantha F H De Witte, Gerjo J V M van Osch, Yves Bayon, Johan F Lange, Yvonne M Bastiaansen-Jenniskens
BACKGROUND: Macrophages and mesenchymal stem cells (MSCs) are important cells in wound healing. We hypothesized that the cross-talk between macrophages and adipose tissue-derived MSCs (ASCs) is biomaterial dependent, thereby influencing processes involved in wound healing. MATERIALS AND METHODS: The effect of macrophages cultured on polypropylene (PP) or polyethylene terephthalate coated with a collagen film (PET/Col) on ASCs in monolayer or on the same material was examined either through conditioned medium (CM) or in a direct coculture...
September 2016: Tissue Engineering. Part A
Abhilash Venugopalan, Min-Jung Lee, Gang Niu, José Medina-Echeverz, Yusuke Tomita, Martin J Lizak, Constance M Cultraro, Robert Mark Simpson, Xiaoyuan Chen, Jane B Trepel, Udayan Guha
Lung adenocarcinoma patients harboring kinase domain mutations in Epidermal growth factor receptor (EGFR) have significant clinical benefit from EGFR-targeted tyrosine kinase inhibitors (TKIs). Although a majority of patients experience clinical symptomatic benefit immediately, an objective response can only be demonstrated after 6-8 weeks of treatment. Evaluation of patient response by imaging shows that 30-40% of patients do not respond due to intrinsic resistance to these TKIs. We investigated immediate-early effects of EGFR-TKI treatment in mutant EGFR-driven transgenic mouse models by FDG-PET and MRI and correlated the effects on the tumor and the tumor microenvironment...
August 2, 2016: Oncotarget
Rawaha Ahmad, Andrey Postnov, Guy Bormans, Jan Versijpt, Mathieu Vandenbulcke, Koen Van Laere
PURPOSE: The cannabinoid type 2 receptor (CB2R) is expressed by immune cells such as monocytes and macrophages. In the brain, CB2R is primarily found on microglia. CB2R upregulation has been reported in animal models of Alzheimer's disease, with a preferential localization near amyloid beta (Aβ) plaques, and in patients post mortem. We performed in vivo brain imaging and kinetic modelling of the CB2R tracer [(11)C]NE40 in healthy controls (HC) and in patients with Alzheimer's disease (AD) to investigate whether higher CB2R availability regionally colocalized to Aβ deposits is present in vivo...
November 2016: European Journal of Nuclear Medicine and Molecular Imaging
Adrese M Kandahari, Xinlin Yang, Kevin A Laroche, Abhijit S Dighe, Dongfeng Pan, Quanjun Cui
In a world where increasing joint arthroplasties are being performed on increasingly younger patients, osteolysis as the leading cause of failure after total joint arthroplasty (TJA) has gained considerable attention. Ultra-high molecular weight polyethylene wear-induced osteolysis is the process by which prosthetic debris mechanically released from the surface of prosthetic joints induces an immune response that favors bone catabolism, resulting in loosening of prostheses with eventual failure or fracture...
2016: Bone Research
L M Rocha-Ramírez, U Hernández-Chiñas, D Baños-Rojas, J Xicohtencatl-Cortés, M E Chávez-Berrocal, G Rico-Rosillo, R Kretschmer, C A Eslava
BACKGROUND: Pet is a toxin from the family of Serine Protease Autotransporters of Enterobacteriaceae which was initially identified in Enteroaggregative Escherichia coli strains. This protease exhibits enterotoxin properties, damages the cell cytoskeleton and induces intestinal epithelium alterations, which are associated with a severe inflammatory process. An in-vitro study was conducted to evaluate the effect of Pet on the migration of human peripheral blood monocytes-derived macrophages and its participation in the activation of the early inflammatory response and cytokine expression...
2016: BMC Microbiology
Romana Meletta, Larissa Steier, Nicole Borel, Linjing Mu, Claudia Keller, Aristeidis Chiotellis, Erica Russo, Cornelia Halin, Simon M Ametamey, Roger Schibli, Stefanie D Krämer, Adrienne Müller Herde
PURPOSE: A shear stress-induced atherosclerosis mouse model was characterized for its expression of inflammation markers with focus on CD80. With this model, we evaluated two positron emission tomography (PET) radiotracers targeting CD80 as well as 2-deoxy-2-[(18)F]fluoro-D-mannose ([(18)F]FDM) in comparison with 2-deoxy-2-[(18)F]fluoro-D-glucose ([(18)F]FDG). PROCEDURE: A flow constrictive cuff implanted around the common carotid artery in apolipoprotein E knockout mice resulted in plaque formation...
July 18, 2016: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
E Kurtys, J Doorduin, U L M Eisel, R A J O Dierckx, E F J de Vries
PURPOSE: Ulcerative colitis (UC) is a chronic inflammatory disease of the colon that affects an increasing number of patients. High comorbidity is observed between UC and other diseases in which inflammation may be involved, including brain diseases such as cognitive impairment, mental disorders, anxiety, and depression. To investigate the increased occurrence of these brain diseases in patients with UC, non-invasive methods for monitoring peripheral and central inflammation could be applied...
July 11, 2016: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
Yoshifumi Maya, Rudolf A Werner, Claudia Schütz, Hiroshi Wakabayashi, Samuel Samnick, Constantin Lapa, Roland Jahns, Christina Zechmeister, Valérie Jahns, Takahiro Higuchi
: Myocarditis represents a major cause of dilated cardiomyopathy and sudden cardiac death in younger adults. Currently, definitive diagnosis of myocarditis requires endomyocardial biopsy, which is highly invasive and has the drawback of variable sensitivity due to inherent sampling error. Therefore, reliable non-invasive methods to detect and monitor cardiac inflammation are clinically relevant. In this study, we explored the potential of radiolabeled methionine to assess myocardial inflammatory activity in a rat model of experimental autoimmune myocarditis (EAM)...
July 7, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Xingyu Nie, Richard Laforest, Andrew Elvington, Gwendalyn J Randolph, Jie Zheng, Tom Voller, Dana R Abendschein, Suzanne Lapi, Pamela K Woodard
: The macrophage-rich core of advanced human atheroma has been demonstrated to be hypoxic, which may have implications in plaque stability. The goal of this study was to determine the feasibility of the hypoxia positron emission tomography (PET) imaging agent (64)Cu-ATSM to detect hypoxia in a rabbit model of atherosclerosis imaged on a simultaneous positron emission tomography/magnetic resonance (PET/MR) scanner, using MR for both attenuation correction and depiction of lesion location METHODS: New Zealand White rabbits fed a Western diet for 4-6 wk underwent endothelial denudation of the right femoral artery by air desiccation to induce an atherosclerotic-like lesion, and underwent a sham operation on the left femoral artery...
July 7, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Xingyu Nie, Gwendalyn J Randolph, Andrew Elvington, Nilantha Bandara, Alexander Zheleznyak, Robert J Gropler, Pamela K Woodard, Suzanne E Lapi
INTRODUCTION: Cardiovascular disease is the leading cause of death in the United States. The identification of vulnerable plaque at risk of rupture has been a major focus of research. Hypoxia has been identified as a potential factor in the formation of vulnerable plaque, and it is clear that decreased oxygen plays a role in the development of plaque angiogenesis leading to plaque destabilization. The purpose of this study is to demonstrate the feasibility of copper-64 labeled diacetyl-bis (N(4)-methylthiosemicarbazone) ((64)Cu-ATSM), a positron-emitting radiopharmaceutical taken up in low-oxygen-tension cells, for the identification of hypoxic and potentially unstable atherosclerotic plaque in a mouse model...
September 2016: Nuclear Medicine and Biology
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