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https://www.readbyqxmd.com/read/28696254/human-monocyte-subsets-are-transcriptionally-and-functionally-altered-in-aging-in-response-to-pattern-recognition-receptor-agonists
#1
Talibah U Metcalf, Peter A Wilkinson, Mark J Cameron, Khader Ghneim, Cindy Chiang, Anne M Wertheimer, John B Hiscott, Janko Nikolich-Zugich, Elias K Haddad
Age-related alterations in immunity have been linked to increased incidence of infections and decreased responses to vaccines in the aging population. Human peripheral blood monocytes are known to promote Ag presentation and antiviral activities; however, the impact of aging on monocyte functions remains an open question. We present an in-depth global analysis examining the impact of aging on classical (CD14(+)CD16(-)), intermediate (CD14(+)CD16(+)), and nonclassical (CD14(dim)CD16(+)) monocytes. Monocytes sorted from nonfrail healthy adults (21-40 y) and old (≥65 y) individuals were analyzed after stimulation with TLR4, TLR7/8, and retinoic acid-inducible gene I agonists...
July 10, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28684413/a-crispr-cas9-approach-reveals-that-the-polymerase-activity-of-dna-polymerase-%C3%AE-is-dispensable-for-hiv-1-infection-in-dividing-and-nondividing-cells
#2
Russell W Goetze, Dong-Hyun Kim, Raymond F Schinazi, Baek Kim
Retrovirus integration into the host genome relies on several host enzymes, potentially including DNA polymerase β (Pol β). However, whether human Pol β; is essential for lentivirus replication in human cells is unclear. Here, we abolished Pol β expression by targeting its DNA polymerase domain with CRISPR/Cas9 in human monocytic THP-1 cells to investigate Pol β's role in HIV-1 transduction in both dividing and nondividing macrophage stages of THP-1 cells. Pol β-knockout was confirmed by enhanced sensitivity to methyl methanesulfonate - induced DNA damage...
July 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28680905/high-cellular-monocyte-activation-in-people-living-with-human-immunodeficiency-virus-on-combination-antiretroviral-therapy-and-lifestyle-matched-controls-is-associated-with-greater-inflammation-in-cerebrospinal-fluid
#3
Thijs Booiman, Ferdinand W Wit, Irma Maurer, Davide De Francesco, Caroline A Sabin, Agnes M Harskamp, Maria Prins, Paolo Garagnani, Chiara Pirazzini, Claudio Franceschi, Dietmar Fuchs, Magnus Gisslén, Alan Winston, Peter Reiss, Neeltje A Kootstra
BACKGROUND: Increased monocyte activation and intestinal damage have been shown to be predictive for the increased morbidity and mortality observed in treated people living with human immunodeficiency virus (PLHIV). METHODS: A cross-sectional analysis of cellular and soluble markers of monocyte activation, coagulation, intestinal damage, and inflammation in plasma and cerebrospinal fluid (CSF) of PLHIV with suppressed plasma viremia on combination antiretroviral therapy and age and demographically comparable HIV-negative individuals participating in the Comorbidity in Relation to AIDS (COBRA) cohort and, where appropriate, age-matched blood bank donors (BBD)...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28674706/the-effect-of-treatment-of-denture-related-stomatitis-on-peripheral-t-cells-and-monocytes
#4
Joanna Maciąg, Tomasz Mikołajczyk, Paweł Matusik, Daniel Nowakowski, Douglas Robertson, Anna Maciąg, Grzegorz Osmenda, Marta Cześnikiewicz-Guzik
PURPOSE: Systemic immune activation has been recently linked to chronic inflammatory disorders of the oral cavity, particularly to periodontitis. The purpose of this study was to determine whether treatment of a fungus-induced oral inflammation, namely denture-related stomatitis (DRS), can affect the activation of the systemic immune response. MATERIALS AND METHODS: Peripheral blood from patients with denture-related stomatitis caused by Candida albicans infection (n = 15) was collected at three time points: before treatment with nystatin, at the end of therapy and 2 months after finishing therapy...
2017: Oral Health & Preventive Dentistry
https://www.readbyqxmd.com/read/28673565/monocyte-subpopulations-study-in-patients-with-plaque-psoriasis
#5
Mariana Carvalho Costa, Bruno de Oliveira Rocha, Camilla Sampaio Paixão, Maria de Fátima Santos Paim de Oliveira, Lícia Maria Henrique da Mota, Lucas Pedreira de Carvalho
Psoriasis is a chronic and systemic, immune-mediated, inflammatory disease, mainly manifested by skin and / or joints lesions, presenting with a wide degree of clinical severity, but generally with great impact on patients' quality of life. Despite advances in the understanding of its pathogenesis, especially regarding the participation of T-lymphocytes and the key role of TNF, the triggering factor of the disease at the molecular level remains unknown, as well as the function of other cell populations. By presenting antigens to T-lymphocytes, monocytes assume an important role in both innate and adaptive immune response...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28642277/adipose-tissue-macrophages-develop-from-bone-marrow-independent-progenitors-in-xenopus-laevis-and-mouse
#6
Syed F Hassnain Waqas, Anna Noble, Anh C Hoang, Grace Ampem, Manuela Popp, Sarah Strauß, Matthew Guille, Tamás Röszer
ATMs have a metabolic impact in mammals as they contribute to metabolically harmful AT inflammation. The control of the ATM number may have therapeutic potential; however, information on ATM ontogeny is scarce. Whereas it is thought that ATMs develop from circulating monocytes, various tissue-resident Mϕs are capable of self-renewal and develop from BM-independent progenitors without a monocyte intermediate. Here, we show that amphibian AT contains self-renewing ATMs that populate the AT before the establishment of BM hematopoiesis...
June 22, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28641299/monocyte-subsets-are-differentially-lost-from-the-circulation-during-acute-inflammation-induced-by-human-experimental-endotoxemia
#7
Tamar Tak, Roger van Groenendael, Peter Pickkers, Leo Koenderman
Three human monocyte subsets are recognized with different functions in the immune system: CD14++/CD16- classical monocytes (CM), CD14++/CD16+ intermediate monocytes (IM) and CD14+/CD16++ non-classical monocytes (NCM). Increased IM and NCM percentages have been reported under inflammatory conditions, yet little is known about monocyte subsets at the onset of inflammation. The human endotoxemia model is uniquely capable of studying the first phases of acute inflammation induced by intravenous injection of 2 ng/kg bodyweight lipopolysaccharide (LPS) into healthy volunteers...
June 23, 2017: Journal of Innate Immunity
https://www.readbyqxmd.com/read/28639993/peripheral-monocytes-macrophages-phenotypes-associated-to-the-evolution-of-cognitive-performance-in-hiv-infected-patients
#8
Massimiliano Fabbiani, Antonio Muscatello, Paolo Perseghin, Marco Bani, Arianna Incontri, Nicola Squillace, Giuseppe Lapadula, Andrea Gori, Alessandra Bandera
BACKGROUND: The contribution of monocyte activation in the development of HIV-associated neurocognitive disorders is not completely understood. This study aimed to explore the predictive value of peripheral monocyte/macrophage (M/M) phenotypes on the evolution of cognitive performance in a population of virologically-suppressed HIV-infected patients. SETTING: Prospective, observational, longitudinal study. METHODS: HIV-1-infected patients with HIV-RNA<50copies/mL for >12 months underwent neuropsychological examination at baseline and after one year...
June 19, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28638380/candida-albicans-yeast-pseudohyphal-and-hyphal-morphogenesis-differentially-affects-immune-recognition
#9
Liliane Mukaremera, Keunsook K Lee, Hector M Mora-Montes, Neil A R Gow
Candida albicans is a human opportunist pathogen that can grow as yeast, pseudohyphae, or true hyphae in vitro and in vivo, depending on environmental conditions. Reversible cellular morphogenesis is an important virulence factor that facilitates invasion of host tissues, escape from phagocytes, and dissemination in the blood stream. The innate immune system is the first line of defense against C. albicans infections and is influenced by recognition of wall components that vary in composition in different morphological forms...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28631213/the-constitutive-protease-release-by-primary-human-acute-myeloid-leukemia-cells
#10
Maria Honnemyr, Øystein Bruserud, Annette K Brenner
INTRODUCTION: Acute myeloid leukemia (AML) cells show constitutive release of matrix metalloproteases and their inhibitors. We now investigated this constitutive release of protease/protease regulators associated with carcinogenesis (ADAM12, uPA, cystatin B), angiogenesis (serpin E1, uPA, CD147), cancer cell migration (uPA, cystatin C), coagulation (ADAM TS13, serpin C1), inflammation (fetuin A, caspase 1, cystatin C), monocytic differentiation (CFD) or regulation of hematopoiesis (neutrophil elastase)...
June 19, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28620388/trichinella-spiralis-calreticulin-binds-human-complement-c1q-as-an-immune-evasion-strategy
#11
Limei Zhao, Shuai Shao, Yi Chen, Ximeng Sun, Ran Sun, Jingjing Huang, Bin Zhan, Xinping Zhu
As a multicellular parasitic nematode, Trichinella spiralis regulates host immune responses by producing a variety of immunomodulatory molecules to escape from host immune attack, but the mechanisms underlying the immune evasion are not well understood. Here, we identified that T. spiralis calreticulin (Ts-CRT), a Ca(2+)-binding protein, facilitated T. spiralis immune evasion by interacting with the first component of human classical complement pathway, C1q. In the present study, Ts-CRT was found to be expressed on the surface of different developmental stages of T...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28614806/review-of-rosai-dorfman-disease-new-insights-into-the-pathogenesis-of-this-rare-disorder
#12
Yanan Cai, Zhangzhen Shi, Yuansong Bai
Rosai-Dorfman disease (RDD) is a rare histiocytosis typically with bilateral painless cervical lymphadenopathy. Laboratory data are nonspecific, and the presence of emperipolesis in large foamy S-100+ CD1a- histiocytes is the prominent histologic feature. The pathogenesis of RDD still remains elusive. According to published studies, we propose that RDD cells might represent intermediate recruiting monocytes with differentiation blockade. Both disturbance of homoeostasis and inherent genomic alterations could contribute to initiation of the disorder through signal transduction...
June 15, 2017: Acta Haematologica
https://www.readbyqxmd.com/read/28609832/pembrolizumab-induced-thyroiditis-comprehensive-clinical-review-and-insights-into-underlying-involved-mechanisms
#13
Danae A Delivanis, Michael P Gustafson, Svetlana Bornschlegl, Michele M Merten, Lisa Kottschade, Sarah Withers, Allan B Dietz, Mabel Ryder
Context: Thyroid immune-related adverse events (irAEs) in patients treated with programmed death receptor-1 (PD-1) blockade are increasingly recognized as one of the most common adverse effects. Our aim was to determine the incidence and examine the potential mechanisms of anti-PD-1 induced thyroid irAEs. Design: Single center, retrospective cohort study. Patients and Measurements: We studied 93 patients with advanced cancer (aged 24–82 years; 60% males) who received at least one infusion of pembrolizumab...
May 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28606987/the-fate-and-lifespan-of-human-monocyte-subsets-in-steady-state-and-systemic-inflammation
#14
Amit A Patel, Yan Zhang, James N Fullerton, Lies Boelen, Anthony Rongvaux, Alexander A Maini, Venetia Bigley, Richard A Flavell, Derek W Gilroy, Becca Asquith, Derek Macallan, Simon Yona
In humans, the monocyte pool comprises three subsets (classical, intermediate, and nonclassical) that circulate in dynamic equilibrium. The kinetics underlying their generation, differentiation, and disappearance are critical to understanding both steady-state homeostasis and inflammatory responses. Here, using human in vivo deuterium labeling, we demonstrate that classical monocytes emerge first from marrow, after a postmitotic interval of 1.6 d, and circulate for a day. Subsequent labeling of intermediate and nonclassical monocytes is consistent with a model of sequential transition...
July 3, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28604383/pyruvate-controls-the-checkpoint-inhibitor-pd-l1-and-suppresses-t-cell-immunity
#15
Ryu Watanabe, Tsuyoshi Shirai, Hong Namkoong, Hui Zhang, Gerald J Berry, Barbara B Wallis, Benedikt Schaefgen, David G Harrison, Jennifer A Tremmel, John C Giacomini, Jörg J Goronzy, Cornelia M Weyand
Patients with coronary artery disease (CAD) are at high risk for reactivation of the varicella zoster virus (VZV) and development of herpes zoster (HZ). Here, we found that macrophages from patients with CAD actively suppress T cell activation and expansion, leading to defective VZV-specific T cell immunity. Monocyte-derived and plaque-infiltrating macrophages from patients with CAD spontaneously expressed high surface density of the immunoinhibitory ligand programmed death ligand-1 (PD-L1), thereby providing negative signals to programmed death-1+ (PD-1+) T cells...
June 30, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28596372/human-blood-monocyte-subsets-a-new-gating-strategy-defined-using-cell-surface-markers-identified-by-mass-cytometry
#16
Graham D Thomas, Anouk A J Hamers, Catherine Nakao, Paola Marcovecchio, Angela M Taylor, Chantel McSkimming, Anh Tram Nguyen, Coleen A McNamara, Catherine C Hedrick
OBJECTIVE: Human monocyte subsets are defined as classical (CD14(++)CD16(-)), intermediate (CD14(++)CD16(+)), and nonclassical (CD14(+)CD16(+)). Alterations in monocyte subset frequencies are associated with clinical outcomes, including cardiovascular disease, in which circulating intermediate monocytes independently predict cardiovascular events. However, delineating mechanisms of monocyte function is hampered by inconsistent results among studies. APPROACH AND RESULTS: We use cytometry by time-of-flight mass cytometry to profile human monocytes using a panel of 36 cell surface markers...
June 8, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28593077/alteration-in-leukocyte-subsets-and-expressions-of-fc%C3%AE-r-and-complement-receptors-among-female-ragpickers-in-eastern-india
#17
Nandan K Mondal, Shabana Siddique, Madhuchanda Banerjee, Sanghita Roychoudhury, Sayali Mukherjee, Mark S Slaughter, Twisha Lahiri, Manas R Ray
BACKGROUND: There are a million ragpickers in India who gather and trade recyclable municipal solid wastes materials for a living. The objective of this study was to examine whether their occupation adversely affects their immunity. METHODS: Seventy-four women ragpickers (median age, 30 years) and 65 age-matched control housemaids were enrolled. Flow cytometry was used to measure leukocyte subsets, and leukocyte expressions of Fcγ receptor I (CD64), FcγRIII (CD16), complement receptor 1 (CD35) and CR3 (CD11b/CD18), and CD14...
June 2017: Safety and Health At Work
https://www.readbyqxmd.com/read/28585214/the-interactions-between-kynurenine-folate-methionine-and-pteridine-pathways-in-obesity
#18
Ayse Basak Engin, Atilla Engin
Obesity activates both innate and adaptive immune responses in adipose tissue. Elevated levels of eosinophils with depression of monocyte and neutrophil indicate the deficiencies in the immune system of morbidly obese individuals. Actually, adipose tissue macrophages are functional antigen-presenting cells that promote the proliferation of interferon-gamma (IFN-gamma)-producing CD4+ T cells in adipose tissue of obese subjects. Eventually, diet-induced obesity is associated with the loss of tissue homeostasis and development of type 1 inflammatory responses in visceral adipose tissue...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28583160/differential-expression-of-cathepsin-e-in-transthyretin-amyloidosis-from-neuropathology-to-the-immune-system
#19
Nádia Pereira Gonçalves, João Moreira, Diana Martins, Paulo Vieira, Laura Obici, Giampaolo Merlini, Margarida Saraiva, Maria João Saraiva
BACKGROUND: Increasing evidence supports a key role for inflammation in the neurodegenerative process of familial amyloidotic polyneuropathy (FAP). While there seems to be an overactivation of the neuronal interleukin-1 signaling pathway, the immune response is apparently compromised in FAP. Accordingly, little immune cell infiltration is observed around pre-fibrillar or fibrillar amyloid deposits, with the underlying mechanism for this phenomenon remaining poorly understood. Cathepsin E (CtsE) is an important intermediate for antigen presentation and chemotaxis, but its role in the pathogenesis of FAP disease remains unknown...
June 6, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28578934/reprint-of-microrna-profiling-of-human-intermediate-monocytes
#20
Adam M Zawada, Lu Zhang, Insa E Emrich, Kyrill S Rogacev, Nicolas Krezdorn, Björn Rotter, Danilo Fliser, Yvan Devaux, Loems Ziegler-Heitbrock, Gunnar H Heine
Among the three human monocyte subsets, intermediate CD14++CD16+ monocytes have been characterized as particularly proinflammatory cells in experimental studies and as potential biomarkers of cardiovascular risk in clinical cohorts. To further substantiate the distinct role of intermediate monocytes within human monocyte heterogeneity, we assessed subset-specific expression of miRNAs as central epigenetic regulators of gene expression. We hypothesized that intermediate monocytes have a distinct miRNA profile compared to classical and non-classical monocytes...
June 2017: Immunobiology
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