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https://www.readbyqxmd.com/read/28934133/understanding-the-mechanism-of-translocation-of-adenylate-cyclase-toxin-across-biological-membranes
#1
REVIEW
Helena Ostolaza, César Martín, David González-Bullón, Kepa B Uribe, Asier Etxaniz
Adenylate cyclase toxin (ACT) is one of the principal virulence factors secreted by the whooping cough causative bacterium Bordetella pertussis, and it has a critical role in colonization of the respiratory tract and establishment of the disease. ACT targets phagocytes via binding to the CD11b/CD18 integrin and delivers its N-terminal adenylate cyclase (AC) domain directly to the cell cytosol, where it catalyzes unregulated conversion of cytosolic ATP into cAMP upon activation by binding to cellular calmodulin...
September 21, 2017: Toxins
https://www.readbyqxmd.com/read/28904019/cathepsin-b-mediated-cd18-shedding-regulates-leukocyte-recruitment-from-angiogenic-vessels
#2
Shintaro Nakao, Souska Zandi, Dawei Sun, Ali Hafezi-Moghadam
Cathepsin B (CtsB) contributes to atherosclerosis and cancer progression by processing the extracellular matrix and promoting angiogenesis. Although CtsB was reported to promote and reduce angiogenesis, there is no mechanistic explanation that reconciles this apparent discrepancy. CtsB cleaves CD18 from the surface of immune cells, but its contribution to angiogenesis has not been studied. We developed an in vivo technique for visualization of immune cell transmigration from corneal vessels toward implanted cytokines...
September 13, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28873429/cd18-deficiency-improves-liver-injury-in-the-mcd-model-of-steatohepatitis
#3
Andrew A Pierce, Caroline C Duwaerts, Kevin Siao, Aras N Mattis, Amanda Goodsell, Jody L Baron, Jacquelyn J Maher
Neutrophils and macrophages are important constituents of the hepatic inflammatory infiltrate in non-alcoholic steatohepatitis. These innate immune cells express CD18, an adhesion molecule that facilitates leukocyte activation. In the context of fatty liver, activation of infiltrated leukocytes is believed to enhance hepatocellular injury. The objective of this study was to determine the degree to which activated innate immune cells promote steatohepatitis by comparing hepatic outcomes in wild-type and CD18-mutant mice fed a methionine-choline-deficient (MCD) diet...
2017: PloS One
https://www.readbyqxmd.com/read/28846568/impact-of-blood-mixing-and-abo-compatibility-on-platelet-leukocyte-aggregations-and-platelet-p-selectin-expression-an-in-vitro-study
#4
Go-Shine Huang, Mei-Hua Hu, Tso-Chou Lin, Yi-Ting Tsai, Chih-Yuan Lin, Hung-Yen Ke, Xu-Zhi Zheng, Yi-Chang Lin, Chien-Sung Tsai
Effects of blood transfusions on platelet-related and leukocyte-related inflammation are unclear. We simulated transfusion using in vitro blood mixing to evaluate platelet-leukocyte aggregations (PLA) and platelet P-selectin expression, and the mechanism of PLA. Donor packed red blood cells (pRBCs) were obtained from a blood bank. Recipient whole blood samples were obtained from patients undergoing cardiac surgery. Blood sample mixtures were divided into four groups: group M, cross-matched blood type mixing; group O, donor type O with other blood type mixing (A, B, or AB); group S, ABO type-specific uncross-matched blood mixing; and group I, ABO incompatibility mixing...
August 25, 2017: Shock
https://www.readbyqxmd.com/read/28814294/canine-intrathoracic-sarcoma-with-ultrastructural-characteristics-of-human-synovial-sarcoma-case-report
#5
Ser Lovell, R K Burchell, P J Roady, R L Fredrickson, A Gal
BACKGROUND: Canine joint sarcomas, designated synovial sarcomas, are uncommon malignant mesenchymal neoplasms that occur in the large joints of the extremities of middle-aged, large-breed dogs. We report the diagnosis of an intrathoracic sarcoma with ultrastructural characteristics reminiscent of human synovial sarcoma in a dog. CASE PRESENTATION: A 7-year-old female spayed Tibetan terrier crossbred dog was presented for acute severe labored breathing and diagnosed with an intrathoracic neoplastic mass...
August 16, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28780099/effect-of-recombinant-bovine-somatotropin-on-leukocyte-mrna-expression-for-genes-related-to-cell-energy-metabolism-cytokine-production-phagocytosis-oxidative-burst-and-adaptive-immunity
#6
P R B Silva, C D Nelson, J P Driver, W W Thatcher, R C Chebel
Objectives of the current experiment were to evaluate the effects of treatment of periparturient dairy cows with recombinant bovine somatotropin (rbST) on mRNA expression in peripheral leukocytes for genes related to the somatotropic axis, cell energy metabolism, and innate and adaptive immune responses. Cows were enrolled in the experiment at 253 ± 3 d of gestation and assigned to an untreated control group (n = 98) or to receive 125 mg of rbST weekly from -21 to 21 d relative to calving (rbST125; n = 98)...
August 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28760979/phospholipase-a-activity-of-adenylate-cyclase-toxin-mediates-translocation-of-its-adenylate-cyclase-domain
#7
David González-Bullón, Kepa B Uribe, César Martín, Helena Ostolaza
Adenylate cyclase toxin (ACT or CyaA) plays a crucial role in respiratory tract colonization and virulence of the whooping cough causative bacterium Bordetella pertussis Secreted as soluble protein, it targets myeloid cells expressing the CD11b/CD18 integrin and on delivery of its N-terminal adenylate cyclase catalytic domain (AC domain) into the cytosol, generates uncontrolled toxic levels of cAMP that ablates bactericidal capacities of phagocytes. Our study deciphers the fundamentals of the heretofore poorly understood molecular mechanism by which the ACT enzyme domain directly crosses the host cell membrane...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28753579/inhibitors-of-telomerase-and-poly-adp-ribose-polymerases-synergize-to-limit-the-lifespan-of-pancreatic-cancer-cells
#8
Katrina M Burchett, Asserewou Etekpo, Surinder K Batra, Ying Yan, Michel M Ouellette
Imetelstat (GRN163L) is a potent and selective inhibitor of telomerase. We have previously reported that GRN163L could shorten telomeres and limit the lifespan of CD18/HPAF and CAPAN1 pancreatic cancer cells. Here, we examined the effects of GRN163L on two other pancreatic cancer cell lines: AsPC1 and L3.6pl. In both lines, chronic exposure to GRN163L led to an initial shortening of telomeres followed by a stabilization of extremely short telomeres. In AsPC1 cells, telomere attrition eventually led to the induction of crisis and the loss of the treated population...
July 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28750142/feline-leukocyte-adhesion-cd18-deficiency-caused-by-a-deletion-in-the-integrin-%C3%AE-2-itgb2-gene
#9
Thomas R Bauer, Suzanne M Pratt, Christina M Palena, Karthik Raj, Urs Giger
BACKGROUND: Leukocyte adhesion deficiency (LAD) or CD18 deficiency is an autosomal recessive immunodeficiency which has been described in people, cattle, dogs, and knockout mice. OBJECTIVES: The study goals were to characterize the clinicopathologic, immunologic, and molecular genetic features of feline LAD (FLAD) in a neutered male adult Domestic Longhair cat with severe leukocytosis and recurrent infections. METHODS: Flow cytometry evaluated surface expression of CD18 on neutrophils...
July 27, 2017: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/28734574/early-reduction-of-matrix-metalloproteinase-8-serum-levels-is-associated-with-leptin-drop-and-predicts-diabetes-remission-after-bariatric-surgery
#10
Luca Liberale, Aldo Bonaventura, Federico Carbone, Maria Bertolotto, Paola Contini, Nicola Scopinaro, Giovanni Bruno Camerini, Francesco Saverio Papadia, Renzo Cordera, Giovanni Guido Camici, Franco Dallegri, Gian Franco Adami, Fabrizio Montecucco
BACKGROUND: We aimed at investigating whether the acute abrogation of leptin after bariatric surgery is able to reduce neutrophil activation and potentially affect type 2 diabetes mellitus (T2DM) remission. METHODS: Metabolic and inflammatory parameters (i.e. leptin, IL-6 and neutrophil products) were compared at baseline (before bariatric surgery), one month, one and three years after surgery in morbid obese (MOB) T2DM patients (n=12) and non-MOB controls (n=32)...
July 13, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28730726/changes-in-the-extracellular-matrix-surrounding-human-chronic-wounds-revealed-by-2-photon-imaging
#11
Jessica E S Sutcliffe, Christopher Thrasivoulou, Thomas E Serena, Leigh Madden, Toby Richards, Anthony R J Phillips, David L Becker
Chronic wounds are a growing problem worldwide with no effective therapeutic treatments available. Our objective was to understand the composition of the dermal tissue surrounding venous leg ulcers and diabetic foot ulcers (DFU). We used novel 2-photon imaging techniques alongside classical histology to examine biopsies from the edges of two common types of chronic wound, venous leg ulcers and DFU. Compared to normal intact skin, we found that collagen levels are significantly reduced throughout the dermis of venous leg ulcer biopsies and DFU, with a reduction in both fibril thickness and abundance...
July 20, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28714582/altered-levels-of-soluble-cd18-may-associate-immune-mechanisms-with-outcome-in-sepsis
#12
T W Kragstrup, K Juul-Madsen, S H Christiansen, X Zhang, J Krog, T Vorup-Jensen, A G Kjaergaard
The pathogenesis of sepsis involves a dual inflammatory response, with a hyperinflammatory phase followed by, or in combination with, a hypoinflammatory phase. The adhesion molecules lymphocyte function-associated antigen (LFA-1) (CD11a/CD18) and macrophage-1 (Mac-1) (CD11b/CD18) support leucocyte adhesion to intercellular adhesion molecules and phagocytosis through complement opsonization, both processes relevant to the immune response during sepsis. Here, we investigate the role of soluble (s)CD18 in sepsis with emphasis on sCD18 as a mechanistic biomarker of immune reactions and outcome of sepsis...
July 17, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28661042/cd11b-promotes-the-differentiation-of-osteoclasts-induced-by-rankl-through-the-spleen-tyrosine-kinase-signalling-pathway
#13
Guoxi Yang, Xiaoyong Chen, Zhao Yan, Qingsheng Zhu, Chongfei Yang
Macrophage surface antigen-1 (Mac-1, CD11b/CD18) has been implicated in the regulation of osteoclastogenesis. In the synovial tissues of patients with aseptic loosening after total hip replacement, CD11b was up-regulated, which indicated that CD11b is closely involved in osteolysis around the prosthesis. We found that CD11b, but not CD18, promoted osteoclast (OC) maturation. Here, we show CD11b up-regulated the levels of spleen tyrosine kinase (Syk), c-Fos and nuclear factor of activated T cells, cytoplasmic-1 (NFATc1), as well as the activity of extracellular-regulated kinase (Erk), and as a result, osteoclast precursors (OCPs) differentiated and became tartrate-resistant acid phosphatase (TRAP)-positive...
June 29, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28655099/-mononuclear-cells-of-umbilical-cord-blood-differentiation-to-granulocyte-cell-in-vitro
#14
L Chen, X Y Xie, J Q Nie, D L Chen, A P Huang, F Fang, M Y Qu, X Nan, L J He, Z Fan, W Yue, X T Pei
Objective: To explore an optimal method for granulocyte cell production from umbilical cord blood mononuclear cells. Methods: Erythrocytes were precipitated by hydroxyethyl starch. Mononuclear cells were isolated through Ficoll density gradient centrifugation. Different media, additives and cultivation model were chosen for granulocyte induction. Cell morphology was observed by microscopy, and cell phenotype was detected by flow cytometry. The CD18 expression of granulocytes was tested by immunofluorescence assay, and phagocytosis test was executed as well...
June 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/28615221/coronin-1a-a-novel-player-in-integrin-biology-controls-neutrophil-trafficking-in-innate-immunity
#15
Robert Pick, Daniela Begandt, Thomas J Stocker, Melanie Salvermoser, Sarah Thome, Ralph T Böttcher, Eloi Montanez, Ute Harrison, Ignasi Forné, Alexander G Khandoga, Raffaele Coletti, Ludwig T Weckbach, Doris Brechtefeld, Rainer Haas, Axel Imhof, Steffen Massberg, Markus Sperandio, Barbara Walzog
Trafficking of polymorphonuclear neutrophils (PMNs) during inflammation critically depends on the β2 integrins lymphocyte function-associated antigen 1 (LFA-1) (CD11a/CD18) and macrophage-1 antigen (CD11b/CD18). Here, we identify coronin 1A (Coro1A) as a novel regulator of β2 integrins that interacts with the cytoplasmic tail of CD18 and is crucial for induction of PMN adhesion and postadhesion events, including adhesion strengthening, spreading, and migration under flow conditions. Transition of PMN rolling to firm adhesion critically depends on Coro1A by regulating the accumulation of high-affinity LFA-1 in focal zones of adherent cells...
August 17, 2017: Blood
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
#16
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/28577901/functional-studies-of-chronic-lymphocytic-leukemia-b-cells-expressing-%C3%AE-2-integrin-type-complement-receptors-cr3-and-cr4
#17
Barbara Uzonyi, Bernadett Mácsik-Valent, Szilvia Lukácsi, Richárd Kiss, Katalin Török, Mariann Kremlitzka, Zsuzsa Bajtay, Judit Demeter, Csaba Bödör, Anna Erdei
The expression and role of CR3 (CD11b/CD18) and CR4 (CD11c/CD18) in B cells are not yet explored in contrast to myeloid cells, where these β2-integrin type receptors are known to participate in various cellular functions, including phagocytosis, adherence and migration. Here we aimed to reveal the expression and role of CR3 and CR4 in human B cells. In B cells of healthy donors CR3 and CR4 are scarcely expressed. However, two patients with chronic lymphocytic leukemia (CLL) characterized by a peculiar immune-phenotype containing both CD5-positive and CD5-negative B cell populations made possible to study these molecules in distinct B cell subsets...
September 2017: Immunology Letters
https://www.readbyqxmd.com/read/28555620/leukocyte-integrin-mac-1-regulates-thrombosis-via-interaction-with-platelet-gpib%C3%AE
#18
Yunmei Wang, Huiyun Gao, Can Shi, Paul W Erhardt, Alexander Pavlovsky, Dmitry A Soloviev, Kamila Bledzka, Valentin Ustinov, Liang Zhu, Jun Qin, Adam D Munday, Jose Lopez, Edward Plow, Daniel I Simon
Inflammation and thrombosis occur together in many diseases. The leukocyte integrin Mac-1 (also known as integrin αMβ2, or CD11b/CD18) is crucial for leukocyte recruitment to the endothelium, and Mac-1 engagement of platelet GPIbα is required for injury responses in diverse disease models. However, the role of Mac-1 in thrombosis is undefined. Here we report that mice with Mac-1 deficiency (Mac-1(-/-)) or mutation of the Mac-1-binding site for GPIbα have delayed thrombosis after carotid artery and cremaster microvascular injury without affecting parameters of haemostasis...
May 30, 2017: Nature Communications
https://www.readbyqxmd.com/read/28554712/the-role-of-cr3-cd11b-cd18-and-cr4-cd11c-cd18-in-complement-mediated-phagocytosis-and-podosome-formation-by-human-phagocytes
#19
Szilvia Lukácsi, Zsuzsa Nagy-Baló, Anna Erdei, Noémi Sándor, Zsuzsa Bajtay
CR3 and CR4 belong to the family of β2-integrins and play an important role in phagocytosis, cellular adherence and migration. CR3 and CR4 are generally expected to mediate similar functions due to their structural homology, overlapping ligand specificity and parallel expression on human phagocytes. Although the different signalling pathways of these receptors suggest distinct functions, possible differences are just being revealed. Previously we proved that CR3 plays a key role in the uptake of iC3b-opsonized particles by human dendritic cells...
September 2017: Immunology Letters
https://www.readbyqxmd.com/read/28542608/increase-in-complement-ic3b-is-associated-with-anti-inflammatory-cytokine-expression-during-late-pregnancy-in-mice
#20
Keigo Nakamura, Kazuya Kusama, Rulan Bai, Sadamasa Ishikawa, Sayuri Fukushima, Yoshihito Suda, Kazuhiko Imakawa
Immunological tolerance between fetal allograft and mother is crucial for pregnancy establishment and maintenance; however, these mechanisms particularly those during the latter part of pregnancy have not been definitively elucidated. The aim of this study was to examine the presence and potential function of innate immunity characteristic to the middle to late pregnancy. We first characterized up-regulated proteins in decidua from day 11 pregnant (P11) mice using 2D-PAGE, followed by MALDI-TOF/MS analysis...
2017: PloS One
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