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L-selectin

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https://www.readbyqxmd.com/read/28515724/an-analysis-of-trafficking-receptors-shows-that-cd44-and-p-selectin-glycoprotein-ligand-1-collectively-control-the-migration-of-activated-human-t-cells
#1
Amal J Ali, Ayman F Abuelela, Jasmeen S Merzaban
Selectins guide the traffic of activated T-cells through the blood stream by mediating their tethering and rolling onto inflamed endothelium, in this way acting as beacons to help navigate them to sites of inflammation. Here, we present a comprehensive analysis of E-selectin ligands expressed on activated human T-cells. We identified several novel glycoproteins that function as E-selectin ligands. Specifically, we compared the role of P-selectin glycoprotein ligand-1 (PSGL-1) and CD43, known E-selectin ligands, to CD44, a ligand that has not previously been characterized as an E-selectin ligand on activated human T-cells...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28497779/l-selectin-mechanochemistry-restricts-neutrophil-priming-in-vivo
#2
Zhenghui Liu, Tadayuki Yago, Nan Zhang, Sumith R Panicker, Ying Wang, Longbiao Yao, Padmaja Mehta-D'souza, Lijun Xia, Cheng Zhu, Rodger P McEver
Circulating neutrophils must avoid premature activation to prevent tissue injury. The leukocyte adhesion receptor L-selectin forms bonds with P-selectin glycoprotein ligand-1 (PSGL-1) on other leukocytes and with peripheral node addressin (PNAd) on high endothelial venules. Mechanical forces can strengthen (catch) or weaken (slip) bonds between biological molecules. How these mechanochemical processes influence function in vivo is unexplored. Here we show that mice expressing an L-selectin mutant (N138G) have altered catch bonds and prolonged bond lifetimes at low forces...
May 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28489325/reducing-macro-and-microheterogeneity-of-n-glycans-enabled-solving-the-crystal-structure-of-the-lectin-and-egf-like-domains-of-human-l-selectin-at-1-9-%C3%A3-resolution
#3
Stefanie Wedepohl, Jens Dernedde, Ardeschir Vahedi-Faridi, Rudolf Tauber, Wolfram Saenger, Haydar Bulut
L-selectin is a cell adhesion receptor located on the surface of most leukocytes and contains a total of 7 N-glycosylation sites. To obtain the crystal structure of human L-selectin, we expressed a shortened version comprising the C-type lectin and EGF-like domains of L-selectin (termed LE hereafter) and systematically analysed mutations of the three glycosylation sites at Asn22, Asn66, and Asn139 in order to reduce macroheterogeneity. After we further removed microheterogeneity, we obtained crystals which diffracted X-rays up to 1...
May 10, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28475489/differential-modulation-of-innate-immune-response-by-epinephrine-and-estradiol
#4
Sona Margaryan, Armenuhi Hyusyan, Anush Martirosyan, Shushan Sargsian, Gayane Manukyan
Background Although it is widely accepted that catecholamines and estrogens influence immunity and have consequences for health, their effect on innate immunity (e.g. monocytes and neutrophils) is still not fully investigated. Materials and methods Our study aimed to analyze the production of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, monocyte chemoattractant protein (MCP)-1 and IL-8 by whole blood cells following short-term exposure to epinephrine (Epi) and 17β-estradiol (E2) in the presence or absence of lipopolysaccharide (LPS)...
May 5, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/28464105/effects-of-dexamethasone-treatment-and-respiratory-vaccination-on-rectal-temperature-complete-blood-count-and-functional-capacities-of-neutrophils-in-beef-steers
#5
H D Hughes, J A Carroll, N C Burdick Sanchez, S L Roberts, P R Broadway, N D May, M A Ballou, J T Richeson
The objective of this research was to examine the effects of dexamethasone (DEX) treatment on various aspects of immunity following administration of a multivalent respiratory vaccine, using a model intended to mimic acute versus chronic stress. Angus × Hereford steers ( = 32; 209 ± 8 kg) were stratified by BW and randomly assigned to 1 of 3 treatments: 1) acute stress (ACU), in which 0.5 mg/kg BW DEX was intravenously administered at 1000 h only on d 0; 2) chronic stress (CHR), in which 0.5 mg/kg BW DEX was intravenously administered at 1000 h on d -3 to 0; or 3) control (CON), in which no DEX was administered...
April 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28446179/glycam1-negatively-regulates-monocyte-entry-into-the-optic-nerve-head-and-contributes-to-radiation-based-protection-in-glaucoma
#6
Pete A Williams, Catherine E Braine, Nicole E Foxworth, Kelly E Cochran, Simon W M John
BACKGROUND: We previously reported a profound long-term neuroprotection subsequent to a single radiation-therapy in the DBA/2J mouse model of glaucoma. This neuroprotection prevents entry of monocyte-like immune cells into the optic nerve head during glaucoma. Gene expression studies in radiation-treated mice implicated Glycam1 in this protection. Glycam1 encodes a proteoglycan ligand for L-selectin and is an excellent candidate to modulate immune cell entry into the eye. Here, we experimentally test the hypothesis that radiation-induced over-expression of Glycam1 is a key component of the neuroprotection...
April 26, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28434729/effects-of-intrauterine-infusion-of-escherichia-coli-lipopolysaccharide-on-uterine-mrna-gene-expression-and-peripheral-polymorphonuclear-leukocytes-in-jersey-cows-diagnosed-with-purulent-vaginal-discharge
#7
João G N Moraes, Luís G D Mendonça, Paula R B Silva, Alexandre A Scanavez, Klibs N Galvão, Michael A Ballou, Milli Worku, Ricardo C Chebel
The objectives of the current experiment were to investigate the effects of intrauterine treatment of cows with purulent vaginal discharge (PVD) using lipopolysaccharide (LPS) from Escherichia coli on uterine mRNA expression of genes related to inflammatory responses, peripheral polymorphonuclear leukocyte (PMN) function, hematological parameters, and blood concentrations of cortisol, haptoglobin, and progesterone (P4). Jersey cows (n = 3,084) were examined for PVD at 35 ± 6 d postpartum using the Metricheck device (Simcro, Hamilton, New Zealand)...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28419144/stepwise-inhibition-of-t-cell-recruitment-at-post-capillary-venules-by-orally-active-desulfated-heparins-in-inflammatory-arthritis
#8
Hasan Al Faruque, Jin Hee Kang, Seung Rim Hwang, Shijin Sung, Md Mahmudul Alam, Keum Hee Sa, Eon Jeong Nam, Young Ro Byun, Young Mo Kang
Identification of the structure-function relationship of heparin, particularly between 2-O-, 6-O-, and N-sulfation and its anticoagulant or anti-inflammatory activities, is critical in order to evaluate the biological effects of heparin, especially in conjunction with modifications for oral formulation. In this study, we demonstrated that removal of 2-O, 6-O, or N-desulfation and their hydrophobic modifications have differential effects on the blocking of interactions between sLeX and P-and L-selectins, with highest inhibition by 6-O desulfation, which was consistent with their in vivo therapeutic efficacies on CIA mice...
2017: PloS One
https://www.readbyqxmd.com/read/28416510/erythrocyte-sialoglycoproteins-engage-siglec-9-on-neutrophils-to-suppress-activation
#9
Anel Lizcano, Ismael Secundino, Simon Döhrmann, Ross Corriden, Cristina Rohena, Sandra Diaz, Pradipta Ghosh, Lingquan Deng, Victor Nizet, Ajit Varki
Healthy blood neutrophils are functionally quiescent in the bloodstream, have a short lifespan, and exit the circulation to carry out innate immune functions, or undergo rapid apoptosis and macrophage-mediated clearance to mitigate host tissue damage. Limitation of unnecessary intravascular neutrophil activation is also important to prevent serious inflammatory pathologies. Since neutrophils become easily activated after purification, we carried out ex vivo comparisons with neutrophils maintained in whole blood...
April 17, 2017: Blood
https://www.readbyqxmd.com/read/28389600/intravascular-donor-monocytes-play-a-central-role-in-lung-transplant-ischaemia-reperfusion-injury
#10
Kate Colette Tatham, Kieran Patrick O'Dea, Rosalba Romano, Hannah Elizabeth Donaldson, Kenji Wakabayashi, Brijesh Vipin Patel, Louit Thakuria, Andre Rudiger Simon, Padmini Sarathchandra, Nandor Marczin, Masao Takata
RATIONALE: Primary graft dysfunction in lung transplant recipients derives from the initial, largely leukocyte-dependent, ischaemia-reperfusion injury. Intravascular lung-marginated monocytes have been shown to play key roles in experimental acute lung injury, but their contribution to lung ischaemia-reperfusion injury post transplantation is unknown. OBJECTIVE: To define the role of donor intravascular monocytes in lung transplant-related acute lung injury and primary graft dysfunction...
April 7, 2017: Thorax
https://www.readbyqxmd.com/read/28365508/in-vitro-the-differences-of-inflammatory-and-oxidative-reactions-due-to-sulfur-mustard-induced-acute-pulmonary-injury-underlying-intraperitoneal-injection-and-intratracheal-instillation-in-rats
#11
Dan Yu, Yuan-Yuan Bei, Yuan Li, Wei Han, Yu-Xu Zhong, Fei Liu, Yu-Ling Zhao, Xiao-Ji Zhu, Jian Zhao
This study was to investigate the differences of inflammatory reaction and oxidative stress due to sulfur mustard (SM)-induced acute pulmonary injury via two ways in rats. In intraperitoneal and tracheal SM groups, injected intraperitoneally and instilled intratracheally with 0.1mL diluted SM (0.96 LD50=8mg/kg) and SM (0.98 LD50=2mg/kg) were administered in rats. In bronchoalveolar lavage fluid, serum, and alveolar septum, lactate dehydrogenase, glutathione peroxidase, tumor necrosis factor-α, interleukin-1β, interleukin-6, C-reactive protein, intercellular adhesion molecule-1, vascular cell adhesion molecule-1, l-selectin, r-glutamyl transpeptidase, thiobarbituric acid reactive substances levels as well as the expression of CD4, CD20, CD68, 8-hydroxy deoxyguanosine, nuclear factor-E2-related factor 2, and heme oxygenase-1 measured by ELISA, immune scatter turbidimetry and immunohistochemical method in the intraperitoneal SM group were increased at each time-point compared with the tracheal SM groups, respectively...
March 30, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28349480/monitoring-rhogtpase-activity-in-leukocytes-using-classic-pull-down-assays
#12
Marouan Zarrouk, David Killock, Izajur Rahman, Jessica Davies, Aleksandar Ivetić
Inflammation is a complex process involving the contribution of leukocytes and blood vessels, which collectively aim to restore homeostasis following injury to the body. Leukocytes are essential front-line responders to infectious or noninfectious injury and can be deployed within minutes of sensing damage. A typical inflammatory response leads to the exit of circulating leukocytes into the surrounding extravascular space, which follows a series of increasingly adhesive events - collectively termed the "multistep adhesion cascade...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28334045/plasma-soluble-l-selectin-in-medicated-patients-with-schizophrenia-and-healthy-controls
#13
Satyajit Mohite, Fang Yang, Pooja A Amin, Giovana Zunta-Soares, Gabriela D Colpo, Laura Stertz, Ajaykumar N Sharma, Gabriel R Fries, Consuelo Walss-Bass, Jair C Soares, Olaoluwa O Okusaga
Immune dysfunction has been implicated in the pathophysiology of schizophrenia. Leukocyte migration to the site of inflammation is a fundamental step of immune response which involves P-, E-, and L-selectins. Elevated selectin levels have been reported in un-medicated first-episode patients with schizophrenia but not in medicated patients with multi-episode schizophrenia. We measured fasting plasma soluble P-, E-, and L-selectin in 39 medicated patients with multi-episode schizophrenia and 19 healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28330896/cell-specific-variation-in-e-selectin-ligand-expression-among-human-peripheral-blood-mononuclear-cells-implications-for-immunosurveillance-and-pathobiology
#14
Mariana Silva, Ronald Kam Fai Fung, Conor Brian Donnelly, Paula Alexandra Videira, Robert Sackstein
Both host defense and immunopathology are shaped by the ordered recruitment of circulating leukocytes to affected sites, a process initiated by binding of blood-borne cells to E-selectin displayed at target endothelial beds. Accordingly, knowledge of the expression and function of leukocyte E-selectin ligands is key to understanding the tempo and specificity of immunoreactivity. In this study, we performed E-selectin adherence assays under hemodynamic flow conditions coupled with flow cytometry and Western blot analysis to elucidate the function and structural biology of glycoprotein E-selectin ligands expressed on human PBMCs...
May 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28322000/postprandial-triglyceride-rich-lipoproteins-promote-lipid-accumulation-and-apolipoprotein-b-48-receptor-transcriptional-activity-in-human-circulating-and-murine-bone-marrow-neutrophils-in-a-fatty-acid-dependent-manner
#15
Almudena Ortega-Gómez, Lourdes M Varela, Sergio Lopez, Sergio Montserrat de la Paz, Rosario Sanchez, Francisco J G Muriana, Beatriz Bermúdez, Rocío Abia
SCOPE: Postprandial triglyceride-rich lipoproteins (TRLs) promote atherosclerosis. Recent research points the bone marrow (BM) as a primary site in atherosclerosis. We elucidated how the acute administration of MUFAs, omega-3 PUFAs and saturated fatty acids (SFAs) affects human circulating and murine BM neutrophil lipid accumulation and functionality. METHODS AND RESULTS: Postprandial hypertriglyceridemia was induced in healthy subjects and Apoe-/- mice by the acute administration of dietary fats enriched in MUFAs, PUFAs or SFAs...
March 21, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28293643/neutrophils-infiltrate-the-spinal-cord-parenchyma-of-rats-with-experimental-diabetic-neuropathy
#16
Victoria L Newton, Jonathan D Guck, Mary A Cotter, Norman E Cameron, Natalie J Gardiner
Spinal glial cell activation and cytokine secretion have been implicated in the etiology of neuropathic pain in a number of experimental models, including diabetic neuropathy. In this study, streptozotocin- (STZ-) induced diabetic rats were either untreated or treated with gabapentin (50 mg/kg/day by gavage for 2 weeks, from 6 weeks after STZ). At 8 weeks after STZ, hypersensitivity was confirmed in the untreated diabetic rats as a reduced response threshold to touch, whilst mechanical thresholds in gabapentin-treated diabetic rats were no different from controls...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28282455/dynamic-biochemical-tissue-analysis-detects-functional-l-selectin-ligands-on-colon-cancer-tissues
#17
Grady E Carlson, Eric W Martin, Venktesh S Shirure, Ramiro Malgor, Vicente A Resto, Douglas J Goetz, Monica M Burdick
A growing body of evidence suggests that L-selectin ligands presented on circulating tumor cells facilitate metastasis by binding L-selectin presented on leukocytes. Commonly used methods for detecting L-selectin ligands on tissues, e.g., immunostaining, are performed under static, no-flow conditions. However, such analysis does not assay for functional L-selectin ligands, specifically those ligands that promote adhesion under shear flow conditions. Recently our lab developed a method, termed dynamic biochemical tissue analysis (DBTA), to detect functional selectin ligands in situ by probing tissues with L-selectin-coated microspheres under hemodynamic flow conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28235798/the-cytoplasmic-tail-of-l-selectin-interacts-with-the-adaptor-protein-complex-ap-1-subunit-%C3%AE-1a-via-a-novel-basic-binding-motif
#18
Karim Dib, Irina G Tikhonova, Aleksandar Ivetic, Peter Schu
L-selectin regulates leukocyte adhesion and rolling along the endothelium. Proteins binding to the cytoplasmic tail of L-selectin regulate L-selectin functions. We used L-selectin cytoplasmic tail peptide pulldown assays combined with high sensitivity liquid chromatography/mass spectrometry to identify novel L-selectin tail-binding proteins. Incubation of the L-selectin tail with cell extracts from phorbol 12-myristate 13-acetate-stimulated Raw 264.7 macrophages resulted in the binding of μ1A of the clathrin-coated vesicle AP-1 complex...
April 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28154998/upregulated-expression-of-substance-p-sp-and-nk1r-in-eczema-and-sp-induced-mast-cell-accumulation
#19
Mengmeng Zhan, Wenjiao Zheng, Qijun Jiang, Zuotao Zhao, Zhiyun Wang, Junling Wang, Huiyun Zhang, Shaoheng He
Substance P (SP) was reported to be associated with eczema and acts as a potent skin mast cell secretagogue. However, little is known of its expression in inflammatory cells in eczema and its ability in induction of mast cell accumulation. In the present study, we investigated expression of SP and neurokinin-1 receptor (NK1R) on peripheral blood leukocytes and mast cells from patients with eczema and influence of SP on mast cell accumulation by using flow cytometry analysis, trans-epithelial cell migration assay and mouse peritoneal model...
February 2, 2017: Cell Biology and Toxicology
https://www.readbyqxmd.com/read/28125045/single-step-purification-of-monomeric-l-selectin-via-aptamer-affinity-chromatography
#20
Christian Kuehne, Stefanie Wedepohl, Jens Dernedde
l-selectin is a transmembrane receptor expressed on the surface of white blood cells and responsible for the tethering of leukocytes to vascular endothelial cells. This initial intercellular contact is the first step of the complex leukocyte adhesion cascade that ultimately permits extravasation of leukocytes into the surrounding tissue in case of inflammation. Here we show the binding of a soluble histidine tagged l-selectin to a recently described shortened variant of an l-selectin specific DNA aptamer with surface plasmon resonance...
January 24, 2017: Sensors
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