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Reyes Niradiz, Benedetti Ines, Rebollo Juan, Correa Oscar, Geliebter Jan
Atypical chemokine receptors have recently emerged as important molecular players in health and diseases; they affect chemokine availability and function and impact a multitude of pathophysiological events, including the tumorigenesis process. This family of atypical receptors comprises five members: ACKR1/DARC, ACKR2/D6, ACKR3/CXCR7, ACKR4/CCRL1, and ACKR5/CCRL2. This work evaluated the differential expression of these receptors in prostate cancer using quantitative PCR. Further evaluation of CCRL2 at the protein level confirmed its overexpression in a metastatic cell line and in malignant prostatic tissues from patients...
November 1, 2017: Journal of Biomedical Research
Sergio Henrique Bastos Damous, George Felipe Bezerra Darce, Renato Silveira Leal, Adilson Rodrigues Costa, Pedro Henrique Alves Ferreira, Celso de Oliveira Bernini, Edivaldo Massazo Utiyama
INTRODUCTION: Severe injuries of the pancreatic head and duodenum in haemodynamically unstable patients are complex management. The purpose of this study is to report a case of complex pancreatic trauma induced by gunshot and managed with surgical approaches at three different times. PRESENTATION OF CASE: Exploratory laparotomy was indicated after initial emergency room care, with findings of cloudy blood-tinged fluid and blood clots on the mesentery near the hepatic angle, on the region of the 2nd portion of the duodenum and at the pancreatic head...
February 15, 2018: International Journal of Surgery Case Reports
Zhao Peng, Miyu Takeshita, Nao Shibata, Hideaki Tada, Yoshikazu Tanaka, Jun Kaneko
Staphylococcus aureus bi-component pore-forming toxins consist of S- and F-components, and form hetero-octameric beta-barrel pores on target blood cell membranes. Among them, γ-hemolysin (Hlg2 and LukF) and LukED (LukE and LukD) possess hemolytic activity, whereas the Panton -Valentine leukocidin (LukS-PV and LukF-PV) does not lyse human erythrocytes.Here, we focused on four loop structures in the rim domain of S-component, namely loops -1, -2, -3, and -4, and found that replacement of loop-4 in both Hlg2 and LukE with that of LukS-PV abolished their hemolytic activity...
February 17, 2018: Journal of Biochemistry
Dorothee Atzler, Menno P J de Winther
No abstract text is available yet for this article.
February 1, 2018: Cardiovascular Research
Tyler W Benson, Daniel S Weintraub, Matthew Crowe, Nicole K H Yiew, Orishebawo Popoola, Ajay Pillai, Joel Joseph, Krystal Archer, Charlotte Greenway, Tapan K Chatterjee, James Mintz, David W Stepp, Brian K Stansfield, Weiqin Chen, Julia Brittain, Vladimir Y Bogdanov, Yan Gao, James G Wilson, Yaoliang Tang, Ha Won Kim, Neal L Weintraub
OBJECTIVE: Inflammation in adipose tissues in obesity promotes insulin resistance and metabolic disease. The Duffy antigen receptor for chemokines (DARC) is a promiscuous non-signaling receptor expressed on erythrocytes and other cell types that modulates tissue inflammation by binding chemokines such as monocyte chemoattractant protein-1 (MCP-1) and by acting as a chemokine reservoir. DARC allelic variants are common in humans, but the role of DARC in modulating obesity-related metabolic disease is unknown...
January 16, 2018: Molecular and Cellular Endocrinology
Philip F Halloran, Jeffery M Venner, Katelynn S Madill-Thomsen, Gunilla Einecke, Michael D Parkes, Luis G Hidalgo, Konrad S Famulski
The molecular mechanisms operating in human organ transplant rejection are best inferred from the mRNAs expressed in biopsies because the corresponding proteins often have low expression and short half-lives, while small non-coding RNAs lack specificity. Associations should be characterized in a population that rigorously identifies T cell-mediated (TCMR) and antibody-mediated rejection (ABMR). This is best achieved in kidney transplant biopsies, but the results are generalizable to heart, lung, or liver transplants...
November 25, 2017: American Journal of Transplantation
Elisabeth Soegaard Christiansen, Henrik Fomsgaard Kjaer, Esben Eller, Carsten Bindslev-Jensen, Arne Høst, Charlotte Gotthard Mortz, Susanne Halken
BACKGROUND: Sensitization to both inhalant and food allergens has been shown to be risk factors for development of asthma and rhinoconjunctivitis (RC). However, few studies have addressed the role of transient or persistent IgE sensitization to specific allergens in early life for later development of allergic diseases. The aim of this study was to explore the association between transient and persistent sensitization in early-life and the development of asthma and RC at 6 and 14 years...
October 5, 2017: Pediatric Allergy and Immunology
Beth Ripley, Gregory J Wilson, Neeraj Lalwani, Noah Briller, Peter C Neligan, Jeffrey H Maki
Purpose To evaluate the clinical performance of dual-agent relaxation contrast (DARC) magnetic resonance (MR) lymphangiography compared with that of conventional MR lymphangiography in the creation of isolated lymphatic maps in patients with secondary lymphedema. Materials and Methods This retrospective study was approved by the institutional review board. The diagnostic quality of 42 DARC MR lymphangiographic studies was compared with that of 42 conventional MR lymphangiographic studies. Two independent readers rated venous contamination as absent, mild, or moderate to severe...
September 21, 2017: Radiology
Ashley Ansel, James D Lewis, Don J Melnick, Cristiana Martins, Claudio Valladares-Padua, Beatriz Perez-Sweeney
The DARC (Duffy antigen receptor for chemokines) gene encodes the DARC protein, which serves multiple roles in the immune system, as a binding site for the malarial parasites Plasmodium vivax and Plasmodium knowlesi, a promiscuous chemokine receptor and a blood group antigen. Variation in DARC may play particularly significant roles in innate immunity, immunotolerance and pathogen entry in callitrichines, such as the black lion tamarin (Leontopithecus chrysopygus). We compared amino acid sequences of DARC in the black lion tamarin (BLT) to non-human Haplorhine primates and Homo sapiens...
October 2017: American Journal of Primatology
Khai Lone Lim, Amirah Amir, Yee Ling Lau, Mun Yik Fong
BACKGROUND: The zoonotic Plasmodium knowlesi is a major cause of human malaria in Malaysia. This parasite uses the Duffy binding protein (PkDBPαII) to interact with the Duffy antigen receptor for chemokines (DARC) receptor on human and macaque erythrocytes to initiate invasion. Previous studies on P. knowlesi have reported distinct Peninsular Malaysia and Malaysian Borneo PkDBPαII haplotypes. In the present study, the differential binding activity of these haplotypes with human and macaque (Macaca fascicularis) erythrocytes was investigated...
August 11, 2017: Malaria Journal
Maria Clara Fernandes da Silva-Malta, Camila Campos Sales, Jacqueline Cronemberger Guimarães, Poliane de Cássia Gonçalves, Daniel Gonçalves Chaves, Hadassa Campos Santos, Alexandre da Costa Pereira, João Gabriel Ribas, Anna Bárbara de Freitas Carneiro-Proietti, Marina Lobato Martins
PURPOSE: Chemokines are important in the immune response against viral infections, and may play a role in human T-lymphotropic virus 1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) pathogenesis. Polymorphisms in the Duffy antigen receptor for chemokines (DARC), such as rs12075 (A>G; FY*B>FY*A) and rs281477 (-46T>C; GATA-1 box) may influence circulating concentrations of proinflammatory chemokines. We investigate whether Duffy genotypes influence the HTLV-1 proviral load (PVL) level, HTLV-1 infection outcome and chemokine concentrations in HTLV-1 asymptomatic carriers (AC=162), HAM/TSP patients (HAM=135) and seronegative individuals (SN=71)...
August 4, 2017: Journal of Medical Microbiology
Elina Ovchynnikova, Francesca Aglialoro, Arthur E H Bentlage, Gestur Vidarsson, Nichole D Salinas, Marieke von Lindern, Niraj H Tolia, Emile van den Akker
Plasmodium vivax is the most prevalent parasite species that causes malaria in humans and exclusively infects reticulocytes. Reticulocyte infection is facilitated by P vivax Duffy binding protein (DBP), which utilizes DARC (Duffy antigen receptor for chemokines) as an entry point. However, the selective tropism of P vivax for transferrin receptor (CD71)-positive reticulocytes remained unexplained, given the constitutive expression of DARC during reticulocyte maturation. CD71/RNA double staining of reticulocytes enriched from adult peripheral blood reveals 4 distinct reticulocyte populations: CD71(high)/RNA(high) (∼0...
September 21, 2017: Blood
Varakorn Kosaisavee, Rossarin Suwanarusk, Adeline C Y Chua, Dennis E Kyle, Benoit Malleret, Rou Zhang, Mallika Imwong, Rawiwan Imerbsin, Ratawan Ubalee, Hugo Sámano-Sánchez, Bryan K S Yeung, Jessica J Y Ong, Eric Lombardini, François Nosten, Kevin S W Tan, Pablo Bifani, Georges Snounou, Laurent Rénia, Bruce Russell
Two malaria parasites of Southeast Asian macaques, Plasmodium knowlesi and P cynomolgi, can infect humans experimentally. In Malaysia, where both species are common, zoonotic knowlesi malaria has recently become dominant, and cases are recorded throughout the region. By contrast, to date, only a single case of naturally acquired P cynomolgi has been found in humans. In this study, we show that whereas P cynomolgi merozoites invade monkey red blood cells indiscriminately in vitro, in humans, they are restricted to reticulocytes expressing both transferrin receptor 1 (Trf1 or CD71) and the Duffy antigen/chemokine receptor (DARC or CD234)...
September 14, 2017: Blood
Ruth O Payne, Sarah E Silk, Sean C Elias, Kathryn H Milne, Thomas A Rawlinson, David Llewellyn, A Rushdi Shakri, Jing Jin, Geneviève M Labbé, Nick J Edwards, Ian D Poulton, Rachel Roberts, Ryan Farid, Thomas Jørgensen, Daniel Gw Alanine, Simone C de Cassan, Matthew K Higgins, Thomas D Otto, James S McCarthy, Willem A de Jongh, Alfredo Nicosia, Sarah Moyle, Adrian Vs Hill, Eleanor Berrie, Chetan E Chitnis, Alison M Lawrie, Simon J Draper
BACKGROUND: Plasmodium vivax is the most widespread human malaria geographically; however, no effective vaccine exists. Red blood cell invasion by the P. vivax merozoite depends on an interaction between the Duffy antigen receptor for chemokines (DARC) and region II of the parasite's Duffy-binding protein (PvDBP_RII). Naturally acquired binding-inhibitory antibodies against this interaction associate with clinical immunity, but it is unknown whether these responses can be induced by human vaccination...
June 15, 2017: JCI Insight
Qinyi Zhu, Lu Jiang, Xipeng Wang
Epithelial ovarian cancer (EOC) is one of the main causes of cancer-associated mortality in females with gynecological malignancies. Duffy antigen receptor for chemokines (DARC) has previously been reported to be involved in tumor growth and the inhibition of tumor metastasis. However, the association between DARC and EOC remains unknown. The aim of the present study was to investigate the expression of DARC in the SKOV3 human epithelial ovarian cancer cell line with the establishment of a subcutaneous model in nude mice...
June 2017: Oncology Letters
Hao Zhang, Edmund Huang, Joseph Kahwaji, Cynthia C Nast, Ping Li, James Mirocha, David L Thomas, Shili Ge, Ashley A Vo, Stanley C Jordan, Mieko Toyoda
BACKGROUND: Sensitization to HLA remains a significant immunologic barrier to successful transplantation. Identifying immune mechanisms responsible for antibody-mediated rejection (AMR) is an important goal. Here, we explored the possibility of predicting the risk for AMR by measuring mRNA transcripts of AMR-associated genes in plasma exosomes from kidney transplant patients. METHODS: Total RNA was extracted from exosomes purified from 152 ethylenediaminetetraacetic acid-plasma samples of 64 patients (18 AMR, 8 cell-mediated rejection [CMR], 38 no rejection in desensitized [DES] and non-DES control groups) for reverse transcription into cDNA, preamplification and then real time quantitative polymerase chain reaction (qPCR) for 21 candidate genes...
October 2017: Transplantation
Eduardo Perales, Jose Ignacio García, Elisabet Pires, Luis Aldea, Laura Lomba, Beatriz Giner
Glycerol is currently considered a raw, renewable material, which can be used to synthesize new glycerol derivatives that may be used as green solvents. However, these compounds must be environmentally evaluated before their use. The acute ecotoxicity of a series of mono-, di-, and trialkyl ethers synthesized from glycerol for the crustacean Daphnia magna has been studied. The EC50 values of these ethers after 24 h of exposure were determined according to the OECD 202 protocol. Their possible structural-toxicity relationships according to different alkyl substituents have been discussed after applying different QSAR models (with the DARC-PELCO approach and topological parameters)...
September 2017: Chemosphere
Benjamin Michael Davis, Kailin Tian, Milena Pahlitzsch, Jonathan Brenton, Nivedita Ravindran, Gibran Butt, Giulia Malaguarnera, Eduardo M Normando, Li Guo, M Francesca Cordeiro
Coenzyme Q10 (CoQ10) is a mitochondrial-targeted antioxidant with known neuroprotective activity. Its ocular effects when co-solubilised with α-tocopherol polyethylene glycol succinate (TPGS) were evaluated. In vitro studies confirmed that CoQ10 was significantly protective in different retinal ganglion cell (RGC) models. In vivo studies in Adult Dark Agouti (DA) rats with unilateral surgically-induced ocular hypertension (OHT) treated with either CoQ10/TPGS micelles or TPGS vehicle twice daily for three weeks were performed, following which retinal cell health was assessed in vivo using DARC (Detection of Apoptotic Retinal Cells) and post-mortem with Brn3a histological assessment on whole retinal mounts...
September 2017: Mitochondrion
S J Glisovic, Y D Pastore, V Gagne, M Plesa, C Laverdière, J M Leclerc, D Sinnett, M Krajinovic
Neutropenia and infection are major dose-limiting side effects of chemotherapy. The risk of initial infection and subsequent complications are directly related to the depth and duration of neutropenia. Recent genome-wide association studies identified variants in DARC and CXCL2 genes, and in ORMDL3-GSDMA-CSF3 locus on chromosome 17q21 that influence white blood cell and neutrophil counts in healthy individuals. To investigate whether polymorphisms in these loci in conjunction with chemotherapy may modulate risk of treatment complications, we analyzed 21 SNPs across these genes for an association with chemotherapy-related neutropenia and infection in 286 Caucasian children with acute lymphoblastic leukemia...
May 23, 2017: Pharmacogenomics Journal
Aude Thiriot, Carolina Perdomo, Guiying Cheng, Igor Novitzky-Basso, Sara McArdle, Jamie K Kishimoto, Olga Barreiro, Irina Mazo, Robinson Triboulet, Klaus Ley, Antal Rot, Ulrich H von Andrian
BACKGROUND: Intravascular leukocyte recruitment in most vertebrate tissues is restricted to postcapillary and collecting venules, whereas capillaries and arterioles usually support little or no leukocyte adhesion. This segmental restriction is thought to be mediated by endothelial, rather than hemodynamic, differences. The underlying mechanisms are largely unknown, in part because effective tools to distinguish, isolate, and analyze venular endothelial cells (V-ECs) and non-venular endothelial cells (NV-ECs) have been unavailable...
May 19, 2017: BMC Biology
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