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mononuclear phagocyte system

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https://www.readbyqxmd.com/read/28513714/highly-water-stable-rare-ternary-ag-au-se-nanocomposites-as-long-blood-circulation-time-x-ray-computed-tomography-contrast-agents
#1
Carlos Caro, Mariona Dalmases, Albert Figuerola, María Luisa García-Martín, Manuel Pernia Leal
X-ray computed tomography (CT) is a powerful and widely used medical non-invasive technique that often requires intravenous administration of contrast agents (CAs) to better visualize soft tissues. In this work, we have developed a novel CT contrast agent based on ternary Ag-Au-Se chalcogenide nanoparticles (NP). A facile ligand exchange by using a 3 kDa PEGylated ligand with a dithiol dihydrolipoic acid as an anchor group resulted in highly water-soluble and monodisperse nanoparticles. These PEGylated ternary NPs were tested in vivo in mice, showing slow uptake by the mononuclear phagocyte system, long blood circulation times, low toxicity, and very good X-ray contrast, thus being promising candidates as CT contrast agents for clinical applications...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28508129/development-and-characterization-of-magnetite-poly-butylcyanoacrylate-nanoparticles-for-magnetic-targeted-delivery-of-cancer-drugs
#2
Margarita López-Viota, Mazen M El-Hammadi, Laura Cabeza, José Prados, Consolación Melguizo, M Adolfina Ruiz Martinez, José L Arias, Ángel V Delgado
A great attention is presently paid to the design of drug delivery vehicles based on surface-modified magnetic nanoparticles. They can, in principle, be directed to a desired target area for releasing their drug payload, a process triggered by pH, temperature, radiation, or even magnetic field. To this, the possibility of forming part of diagnostic tools by enhanced magnetic resonance imaging or that of further treatment by magnetic hyperthermia can be added. Bare particles are rapidly eliminated from the bloodstream by the phagocyte mononuclear system, leading to short biological half-life...
May 15, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28507549/human-lung-mononuclear-phagocytes-in-health-and-disease
#3
REVIEW
Faezzah Baharom, Gregory Rankin, Anders Blomberg, Anna Smed-Sörensen
The lungs are vulnerable to attack by respiratory insults such as toxins, allergens, and pathogens, given their continuous exposure to the air we breathe. Our immune system has evolved to provide protection against an array of potential threats without causing collateral damage to the lung tissue. In order to swiftly detect invading pathogens, monocytes, macrophages, and dendritic cells (DCs)-together termed mononuclear phagocytes (MNPs)-line the respiratory tract with the key task of surveying the lung microenvironment in order to discriminate between harmless and harmful antigens and initiate immune responses when necessary...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28487935/folate-receptor-targeted-ultrasonic-pfob-nanoparticles-synthesis-characterization-and-application-in-tumor-targeted-imaging
#4
Keshi Li, Yahui Liu, Shengmin Zhang, Youfeng Xu, Jianshuai Jiang, Fengying Yin, Yue Hu, Baosan Han, Shuxiong Ge, Li Zhang, Yong Wang
In this study, we aimed to determine an effective strategy for the synthesis of folate receptor (FR) targeted-nanoparticles (FRNPs). The nanoparticles used as ultrasound contrast agents (UCAs) were composed of a liquid core of perfluorooctyl bromide (PFOB) liposome and a targeted shell chemically conjugated with folic acid (FA) and polyethylene glycol (PEG). This was done in order to avoid recognition and clearance by the mononuclear phagocyte system [also known as the reticuloendothelial system (RES)] and enhance the targeting capability of the nanoparticles to tumors overexpressing folate receptor (FR)...
June 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28473237/pharmacokinetic-and-screening-studies-of-the-interaction-between-mononuclear-phagocyte-system-and-nanoparticle-formulations-and-colloid-forming-drugs
#5
Andrew T Lucas, Leah B Herity, Zack A Kornblum, Andrew J Madden, Alberto Gabizon, Alexander V Kabanov, Rose T Ajamie, David M Bender, Palaniappan Kulanthaivel, Manuel V Sanchez-Felix, Henry A Havel, William C Zamboni
Studies have shown that nanoparticles (NPs) are cleared through the mononuclear phagocyte system (MPS). Pharmacokinetic studies of Doxil, DaunoXome, micellar doxorubicin (SP1049C) and small molecule (SM) doxorubicin were performed in SCID mice, Sprague-Dawley rats, and beagle dogs. An ex vivo MPS profiling platform was used to evaluate the interaction between the same agents, as well as colloid-forming and non-colloid forming SM drugs. In all species, the systemic clearance was highest for SP1049C and lowest for Doxil...
May 2, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28471458/comprehensive-analysis-of-mouse-retinal-mononuclear-phagocytes
#6
Anika Lückoff, Rebecca Scholz, Florian Sennlaub, Heping Xu, Thomas Langmann
The innate immune system is activated in a number of degenerative and inflammatory retinal disorders such as age-related macular degeneration (AMD). Retinal microglia, choroidal macrophages, and recruited monocytes, collectively termed 'retinal mononuclear phagocytes', are critical determinants of ocular disease outcome. Many publications have described the presence of these cells in mouse models for retinal disease; however, only limited aspects of their behavior have been uncovered, and these have only been uncovered using a single detection method...
June 2017: Nature Protocols
https://www.readbyqxmd.com/read/28471177/topical-formulation-of-self-assembled-antiviral-prodrug-nanomicelles-for-targeted-retinal-delivery
#7
Abhirup Mandal, Kishore Cholkar, Varun Khurana, Ankit Shah, Vibhuti Agrahari, Rohit Bisht, Dhananjay Pal, Ashim K Mitra
Topical drug administration for back of the eye delivery is extremely challenging due to the presence of protection mechanisms and physiological barriers. Self-assembled polymeric nanomicelles have emerged as promising vehicles for drug delivery. Apart from serving as an inert nanocarrier for therapeutic agents, polymeric nanomicelles are known to bypass mononuclear phagocytic system (MPS) and efflux transporters thereby improving drug bioavailability. In this investigation, a highly efficacious biotinylated lipid prodrug of cyclic cidofovir (B-C12-cCDF) was formulated within polymeric nanomicelles as a carrier for targeted retinal delivery...
May 17, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28433719/isolation-and-characterization-of-monocyte-macrophage-from-peripheral-blood-of-half-smooth-tongue-sole-cynoglossus-semilaevis
#8
Zhenxia Sha, Linqing Wang, Luming Sun, Yadong Chen, Yuan Zheng, Mei Xin, Chen Li, Songlin Chen
In the present study, the peripheral blood cells of half smooth tongue sole (Cynoglossus semilaevis) were examined by blood smear under the light microscopy. The proportion of main types of blood cells are as following: erythrocyte occupied the majority (92.3%), followed by thrombocyte (4.15%), granulocyte (1.7%), lymphocyte (1.5%) and monocyte (0.3%), respectively. Meanwhile, the isolation method of monocytes was established, by density gradient centrifugation to isolate mononuclear leukocytes of peripheral blood...
April 19, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28421864/selfie-autoimmunity-boon-or-bane
#9
Haseeb Ahsan
The immune system provides protection to tissues damaged by infectious microrganisms or physical damage. In autoimmune diseases, the immune system recognizes and attacks its own tissues, i.e., self-destruction. Various agents such as genetic factors and environmental triggers are thought to play a major role in the development of autoimmune diseases. A common feature of all autoimmune diseases is the presence of autoantibodies and inflammation, including mononuclear phagocytes, autoreactive T lymphocytes, and autoantibody producing B cells (plasma cells)...
April 19, 2017: Journal of Immunoassay & Immunochemistry
https://www.readbyqxmd.com/read/28416142/nanoparticle-mediated-drug-delivery-system-for-atherosclerotic-cardiovascular-disease
#10
REVIEW
Tetsuya Matoba, Jun-Ichiro Koga, Kaku Nakano, Kensuke Egashira, Hiroyuki Tsutsui
Administration of drugs and other therapeutic agents has been the central strategy of contemporary medicine for cardiovascular disease. The use of drug delivery systems (DDS) includes micelles, liposomes, polymeric nanoparticles, dendrimers, carbon nanotubes, and crystalline metals. Nano-DDS modify in vivo drug kinetics, depending on (patho)physiological mechanisms such as retard excretion, vascular permeability, and incorporation by mononuclear phagocyte systems, which constitute the 'passive-targeting' property of nano-DDS...
April 13, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28400539/mass-cytometry-deep-phenotyping-of-human-mononuclear-phagocytes-and-myeloid-derived-suppressor-cells-from-human-blood-and-bone-marrow
#11
Mikael Roussel, P Brent Ferrell, Allison R Greenplate, Faustine Lhomme, Simon Le Gallou, Kirsten E Diggins, Douglas B Johnson, Jonathan M Irish
The monocyte phagocyte system (MPS) includes numerous monocyte, macrophage, and dendritic cell (DC) populations that are heterogeneous, both phenotypically and functionally. In this study, we sought to characterize those diverse MPS phenotypes with mass cytometry (CyTOF). To identify a deep phenotype of monocytes, macrophages, and DCs, a panel was designed to measure 38 identity, activation, and polarization markers, including CD14, CD16, HLA-DR, CD163, CD206, CD33, CD36, CD32, CD64, CD13, CD11b, CD11c, CD86, and CD274...
April 11, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28399906/target-organs-for-lymphocystis-disease-virus-replication-in-gilthead-seabream-sparus-aurata
#12
Estefania J Valverde, Juan J Borrego, M Carmen Sarasquete, Juan B Ortiz-Delgado, Dolores Castro
The lymphocystis disease (LCD), the main viral pathology described in cultured gilthead seabream (Sparus aurata), is a self-limiting condition characterized by the appearance of hypertrophied fibroblasts (named lymphocysts) in the connective tissue of fish, primarily in the skin and fins. The causative agent of the disease is the Lymphocystis disease virus (LCDV), a member of the Iridoviridae family. In the present study, LCDV genome and transcripts were detected by real-time PCR in caudal fin, as well as in several internal organs, such as intestine, liver, spleen, kidney and brain, from asymptomatic, diseased and recovered gilthead seabream juveniles...
April 11, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28391709/immune-modulation-properties-of-herbal-plant-leaves-phyllanthus-niruri-aqueous-extract-on-immune-cells-of-tuberculosis-patient-in-vitro-study
#13
Denise Utami Putri, Ning Rintiswati, Marsetyawan Hne Soesatyo, Sofia Mubarika Haryana
Disease progression in Tuberculosis (TB) is dependent on host's immune system. Phyllanthus niruri, a traditional herb, has long been used to boost immune system in Indonesian society. This study aimed to observe the potential role of P. niruri in inducing immune cells activity in TB patients by in vitro approach. Peripheral blood mononuclear cells (PBMCs) and macrophages were collected from active pulmonary TB patients. After stimulation with graded doses of P. niruri aqueous extract, cell proliferation, phagocytic activity and nitric oxide (NO) release were analysed...
April 10, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28380648/-polysialic-acid-for-immunomodulation-in-an-animal-model-for-wet-age-related-macular-degeneration-amd
#14
Thomas Langmann, Sascha Fauser
Background Chronic activation of the innate immune system is a hallmark of retinal degenerative diseases, including age-related macular degeneration (AMD). Overt microglia and macrophage reactivity, as well as dysregulation of the alternative complement system, trigger and sustain retinal degeneration. It is now accepted that there exists a vicious cycle of mononuclear phagocyte reactivity, abnormal intrinsic complement activation, damage of Bruch's membrane, dysfunction of the retinal pigment epithelium, photoreceptor degeneration and choroidal neovascularization (CNV)...
May 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28375632/tumor-acidity-nir-controlled-interaction-of-transformable-nanoparticle-with-biological-systems-for-cancer-therapy
#15
Dongdong Li, Yinchu Ma, Jinzhi Du, Wei Tao, Xiaojiao Du, Xianzhu Yang, Jun Wang
Precisely controlling the interaction of nanoparticles with biological systems (nanobio interactions) from the injection site to biological targets shows great potential for biomedical applications. Inspired by the ability of nanoparticles to alter their physicochemical properties according to different stimuli, we explored the tumor acidity and near-infrared (NIR) light activated transformable nanoparticle (DA)TAT-NPIR&DOX. This nanoparticle consists of a tumor acidity-activated TAT [the TAT lysine residues' amines was modified with 2,3-dimethylmaleic anhydride (DA)], a flexible chain polyphosphoester core coencapsulated a NIR dye IR-780, and DOX (doxorubicin)...
April 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28370104/recent-advances-in-gut-immunology
#16
Nick Powell, Thomas T MacDonald
In recent years there have been significant advances in our understanding of the mucosal immune system. In addition to unravelling some of the complexities of this system, including the discovery of completely new cells types, further insights into the three way interactions between mucosal immune cells, the intestinal epithelium and the microbial communities colonizing the GI tract, promises to redefine our understanding of how intestinal homeostasis is maintained, but also how dysregulation of these highly integrated interactions conspires to cause disease...
March 31, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28361953/cell-to-cell-transfer-of-saa1-protein-in-a-cell-culture-model-of-systemic-aa-amyloidosis
#17
Stephanie Claus, Ioana Puscalau-Girtu, Paul Walther, Tatiana Syrovets, Thomas Simmet, Christian Haupt, Marcus Fändrich
Systemic AA amyloidosis arises from the misfolding of serum amyloid A1 (SAA1) protein and the deposition of AA amyloid fibrils at multiple sites within the body. Previous research already established that mononuclear phagocytes are crucial for the formation of the deposits in vivo and exposure of cultures of such cells to SAA1 protein induces the formation of amyloid deposits within the culture dish. In this study we show that both non-fibrillar and fibrillar SAA1 protein can be readily transferred between cultured J774A...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345586/new-insights-into-mononuclear-phagocyte-biology-from-the-visual-system
#18
REVIEW
Nancy J Reyes, Emily G O'Koren, Daniel R Saban
Major advances in mononuclear phagocyte biology have been made but key questions pertinent to their roles in health and disease remain, including in the visual system. One problem concerns how dendritic cells can trigger immune responses from certain tightly regulated immune- privileged sites of the eye. Another, albeit separate, problem involves whether there are functional specializations for microglia versus monocytes in retinal neurodegeneration. In this Review, we examine novel insights in eye immune privilege and, separately, we discuss recent inroads concerning retinal degeneration...
May 2017: Nature Reviews. Immunology
https://www.readbyqxmd.com/read/28320855/salt-sensitivity-of-angiogenesis-inhibition-induced-blood-pressure-rise-role-of-interstitial-sodium-accumulation
#19
Stephanie Lankhorst, David Severs, Lajos Markó, Natalia Rakova, Jens Titze, Dominik N Müller, A H Jan Danser, Anton H van den Meiracker
In response to salt loading, Na(+) and Cl(-) accumulate in the skin in excess of water, stimulating skin lymphangiogenesis via activation of the mononuclear phagocyte system cell-derived vascular endothelial growth factor-C-vascular endothelial growth factor type 3 receptor signaling pathway. Inhibition of this pathway results in salt-sensitive hypertension. Sunitinib is an antiangiogenic, anticancer agent that blocks all 3 vascular endothelial growth factor receptors and increases blood pressure. We explored the salt dependency of sunitinib-induced hypertension and whether impairment of skin lymphangiogenesis is an underlying mechanism...
May 2017: Hypertension
https://www.readbyqxmd.com/read/28304152/reprogramming-of-histone-methylation-controls-the-differentiation-of-monocytes-into-macrophages
#20
Qi-Fan Zheng, Hui-Min Wang, Zhan-Feng Wang, Jin-Yang Liu, Qi Zhang, Li Zhang, Yuan-Hua Lu, Han You, Guang-Hui Jin
Subset heterogeneity of the mononuclear phagocyte system (MPS) is controlled by defined transcriptional networks and programs; however, the dynamic establishment of programs that control broad, orchestrated expression of transcription factors (TFs) during the progression of monocyte-into-phagocyte (MP) differentiation remains largely unexplored. By using chromatin immunoprecipitation assays, we show the extensive trimethylation of histone H3 lysine 4 (H3K4me3) as well as histone H3 lysine 27 (H3K27me3) occupancy with broad footprints at the promoters of MP differentiation-related TFs, such as HOXA and FOXO genes, KLF4, IRF8 and others...
March 17, 2017: FEBS Journal
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