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Julie Wagner, Karl M Strosing, Sashko G Spassov, Ziwei Lin, Helen Engelstaedter, Sabine Tacke, Alexander Hoetzel, Simone Faller
Mechanical ventilation is a life-saving clinical treatment but it can induce or aggravate lung injury. New therapeutic strategies, aimed at reducing the negative effects of mechanical ventilation such as excessive production of reactive oxygen species, release of pro-inflammatory cytokines, and transmigration as well as activation of neutrophil cells, are needed to improve the clinical outcome of ventilated patients. Though the inhaled anesthetic sevoflurane is known to exert organ-protective effects, little is known about the potential of sevoflurane therapy in ventilator-induced lung injury...
2018: PloS One
Tobias Dahm, Ortwin Adams, Sindy Boettcher, Sabine Diedrich, Vasily Morozov, Grant Hansman, Petra Fallier-Becker, Sebastian Schädler, Claus J Burkhardt, Christel Weiss, Carolin Stump-Guthier, Hiroshi Ishikawa, Horst Schroten, Christian Schwerk, Tobias Tenenbaum, Henriette Rudolph
BACKGROUND: Echovirus (E) 30 (E-30) meningitis is characterized by neuroinflammation involving immune cell pleocytosis at the protective barriers of the central nervous system (CNS). In this context, infection of the blood-cerebrospinal fluid barrier (BCSFB), which has been demonstrated to be involved in enteroviral CNS pathogenesis, may affect the tight junction (TJ) and adherens junction (AJ) function and morphology. METHODS: We used an in vitro human choroid plexus epithelial (HIBCPP) cell model to investigate the effect of three clinical outbreak strains (13-311, 13-759, and 14-397) isolated in Germany in 2013, and compared them to E-30 Bastianni...
February 20, 2018: Journal of Neuroinflammation
Tatsufumi Nakamura, Katsuya Satoh, Hideki Nakamura, Naomi Fukushima, Yoshihiro Nishiura, Takafumi Furuya, Katsuhiro Ichinose
The main clinical feature of human T-cell leukemia virus-1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is slowly progressive spastic paraparesis with bladder dysfunction. HAM/TSP is induced by chronic inflammation in the spinal cord, mainly the lower thoracic cord. A long-standing bystander mechanism, such as the destruction of surrounding tissues by the interaction between infiltrated Th1-like, HTLV-1-infected CD4+ T cells and HTLV-1-specific CD8+ cytotoxic T cells (CTL), is probably critical for the induction of chronic inflammation...
February 5, 2018: AIDS Research and Human Retroviruses
Bryce LaFoya, Jordan A Munroe, Alison Miyamoto, Michael A Detweiler, Jacob J Crow, Tana Gazdik, Allan R Albig
The traditional view of integrins portrays these highly conserved cell surface receptors as mediators of cellular attachment to the extracellular matrix (ECM), and to a lesser degree, as coordinators of leukocyte adhesion to the endothelium. These canonical activities are indispensable; however, there is also a wide variety of integrin functions mediated by non-ECM ligands that transcend the traditional roles of integrins. Some of these unorthodox roles involve cell-cell interactions and are engaged to support immune functions such as leukocyte transmigration, recognition of opsonization factors, and stimulation of neutrophil extracellular traps...
February 2, 2018: International Journal of Molecular Sciences
Michael H Bertl, Clemens Frey, Kristina Bertl, Katharina Giannis, André Gahleitner, Georg D Strbac
OBJECTIVES: Impacted and transmigrated mandibular canines differ greatly in incidence, etiopathology, associated anomalies, and treatment prospects, when compared to their maxillary counterparts. The aim of this study was to provide a detailed analysis of 3D radiographic imaging data of impacted mandibular canines. MATERIALS AND METHODS: In a retrospective cross-sectional study, CT/CBCT data of 88 patients with a total of 94 impacted mandibular canines were analysed...
February 1, 2018: Clinical Oral Investigations
Wiebke Heine, Michael Beckstette, Ann Kathrin Heroven, Sophie Thiemann, Ulrike Heise, Aaron Mischa Nuss, Fabio Pisano, Till Strowig, Petra Dersch
Gastrointestinal infections caused by enteric yersiniae can become persistent and complicated by relapsing enteritis and severe autoimmune disorders. To establish a persistent infection, the bacteria have to cope with hostile surroundings when they transmigrate through the intestinal epithelium and colonize underlying gut-associated lymphatic tissues. How the bacteria gain a foothold in the face of host immune responses is poorly understood. Here, we show that the CNFY toxin, which enhances translocation of the antiphagocytic Yop effectors, induces inflammatory responses...
February 2018: PLoS Pathogens
Lazzat Aibekova, Brian Foley, Gonzalo Hortelano, Muhammad Raees, Sabit Abdraimov, Rakhmanbek Toichuev, Syed Ali
While in other parts of the world it is on decline, incidence of HIV infection continues to rise in the former Soviet Union (FSU) countries. The present study was conducted to investigate the patterns and modes of HIV transmission in FSU countries. We performed phylogenetic analysis of publicly available 2705 HIV-1 subtype A pol sequences from thirteen FSU countries: Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Ukraine and Uzbekistan. Our analysis showed that the clusters from FSU countries were intermixed, indicating a possible role of transmigration in HIV transmission...
2018: PloS One
Chung Park, Il-Young Hwang, John H Kehrl
Intravital two-photon laser scanning microscopy (TP-LSM) has allowed the direct observation of immune cells in intact organs of living animals. In the B cell biology field TP-LSM has detailed the movement of B cells in high endothelial venules and during their transmigration into lymph organs; described the movement and positioning of B cells within lymphoid organs; outlined the mechanisms by which antigen is delivered to B cells; observed B cell interacting with T cells, other cell types, and even with pathogens; and delineated the egress of B cells from the lymph node (LN) parenchyma into the efferent lymphatics...
2018: Methods in Molecular Biology
Upal Roy, Vadym Drozd, Andriy Durygin, Jesse Rodriguez, Paul Barber, Venkata Atluri, Xiaohua Liu, Thomas G Voss, Surendra Saxena, Madhavan Nair
Human Immunodeficiency Virus Type 1 (HIV-1) remains one of the leading causes of death worldwide. Present combination antiretroviral therapy has substantially improved HIV-1 related pathology. However, delivery of therapeutic agents to the HIV reservoir organ like Central nervous system (CNS) remains a major challenge primarily due to the ineffective transmigration of drugs through Blood Brain Barrier (BBB). The recent advent of nanomedicine-based drug delivery has stimulated the development of innovative systems for drug delivery...
January 25, 2018: Scientific Reports
Adama Sidibe, Patricia Ropraz, Stéphane Jemelin, Yalin Emre, Marine Poittevin, Marc Pocard, Paul F Bradfield, Beat A Imhof
Recruitment of circulating monocytes is critical for tumour angiogenesis. However, how human monocyte subpopulations extravasate to tumours is unclear. Here we show mechanisms of extravasation of human CD14dimCD16+ patrolling and CD14+CD16+ intermediate proangiogenic monocytes (HPMo), using human tumour xenograft models and live imaging of transmigration. IFNγ promotes an increase of the chemokine CX3CL1 on vessel lumen, imposing continuous crawling to HPMo and making these monocytes insensitive to chemokines required for their extravasation...
January 24, 2018: Nature Communications
Tomomi Uchida, Hisashi Ueta, Xue-Dong Xu, Jotaro Hirakawa, Kazunori Tahara, Shu Zhou, Yasushi Sawanobori, Szandor Simmons, Yusuke Kitazawa, Hiroto Kawashima, Kenjiro Matsuno
Naive lymphocytes systemically recirculate for immunosurveillance inspecting foreign antigens and pathogens in the body. Trafficking behavior such as the migration pathway and transit time within the gastrointestinal tract, however, remains to be elucidated. Rat thoracic duct lymphocytes (TDLs) were transferred to a congeneic host that had undergone mesenteric lymphadenectomy. The migration pathway was investigated using newly developed four-color immunohistochemistry and immunofluorescence. Donor TDLs showed rapid transition in gut tissues from which they emerged in mesenteric lymph around 4 h after intravenous injection...
January 16, 2018: International Immunology
Ai-Jun Yang, Min Wang, Yan Wang, Wei Cai, Qiang Li, Ting-Ting Zhao, Li-Han Zhang, Katie Houck, Xu Chen, Yan-Ling Jin, Ji-Ying Mu, Jing-Fei Dong, Min Li
Cancer prognosis is poor for patients with blood-borne metastasis. Platelets are known to assist cancer cells in transmigrating through the endothelium, but ligands for the platelet-mediated cancer metastasis remain poorly defined. von Willebrand factor (vWF) is a major platelet ligand that has been widely used as a biomarker in cancer and associated inflammation. However, its functional role in cancer growth and metastasis is largely unknown. Here we report that gastric cancer cells from patients and cells from two well-established gastric cancer lines express vWF and secrete it into the circulation, upon which it rapidly becomes cell-bound to mediate cancer-cell aggregation and interaction with platelets and endothelial cells...
January 24, 2018: Oncogenesis
Alexandre Paré, Benoit Mailhot, Sébastien A Lévesque, Camille Juzwik, Prenitha Mercy Ignatius Arokia Doss, Marc-André Lécuyer, Alexandre Prat, Manu Rangachari, Alyson Fournier, Steve Lacroix
Molecular interventions that limit pathogenic CNS inflammation are used to treat autoimmune conditions such as multiple sclerosis (MS). Remarkably, IL-1β-knockout mice are highly resistant to experimental autoimmune encephalomyelitis (EAE), an animal model of MS. Here, we show that interfering with the IL-1β/IL-1R1 axis severely impairs the transmigration of myeloid cells across central nervous system (CNS) endothelial cells (ECs). Notably, we report that IL-1β expression by inflammatory CCR2hi monocytes favors their entry into the spinal cord before EAE onset...
January 22, 2018: Proceedings of the National Academy of Sciences of the United States of America
Etmar Bulk, Nadzeya Kramko, Ivan Liashkovich, Felix Glaser, Hermann Schillers, Hans-Joachim Schnittler, Hans Oberleithner, Albrecht Schwab
Early metastasis leads to poor prognosis of lung cancer patients, whose 5-year survival rate is only 15%. We could recently show that the Ca2+ sensitive K+ channel KCa3.1 promotes aggressive behavior of non-small cell lung cancer (NSCLC) cells and that it can serve as a prognostic marker in NSCLC. Since NSCLC patients die of metastases, we investigated whether KCa3.1 channels contribute to poor patient prognosis by regulating distinct steps of the metastatic cascade. We investigated the extravasation of NSCLC cells and focused on their adhesion to endothelial cells and on transendothelial migration...
December 22, 2017: Oncotarget
Alyce J Nicholls, Shu Wen Wen, Pam Hall, Michael J Hickey, Connie H Y Wong
Emerging evidence has revealed that noradrenaline (NA), the main neurotransmitter of the sympathetic nervous system (SNS), regulates a variety of immune functions via binding to adrenergic receptors present on immune cells. In this study, we examined the role of NA in the regulation of neutrophil functions. Neutrophils were isolated from the bone marrow of naïve mice and treated with NA at various concentrations to assess the effect on various neutrophil functions. Additionally, we performed cremaster intravital microscopy to examine neutrophil-endothelial cell interactions following NA superfusion in vivo...
December 21, 2017: Journal of Leukocyte Biology
Feng Sun, Min Feng, Wenxian Guan
Peritoneal dissemination is the most frequent metastatic pattern of gastric cancer, but the mechanisms underlying peritoneal dissemination are yet to be elucidated. Paget's 'seed and soil' hypothesis is recognized as the fundamental theory of metastasis. The 'seeding' theory proposes that the formation of peritoneal dissemination is a multistep process, including detachment from the primary tumour, transmigration and attachment to the distant peritoneum, invasion into subperitoneal tissue and proliferation with blood vascular neogenesis...
December 2017: Oncology Letters
Maxime De Laere, Zwi N Berneman, Nathalie Cools
Migration of dendritic cells (DC) to the central nervous system (CNS) is a critical event in the pathogenesis of multiple sclerosis (MS). While up until now, research has mainly focused on the transmigration of DC through the blood-brain barrier, experimental evidence points out that also the choroid plexus and meningeal vessels represent important gateways to the CNS, especially in early disease stages. On the other hand, DC can exit the CNS to maintain immunological tolerance to patterns expressed in the CNS, a process that is perturbed in MS...
January 12, 2018: Journal of Neuropathology and Experimental Neurology
Wei Gu, Lun Yao, Lexing Li, Jianping Zhang, Aaron T Place, Richard D Minshall, Guoquan Liu
Intercellular adhesion molecule-1 is the adhesion molecule mediating leukocyte firm adhesion to endothelial cells, plays a critical role in subsequent leukocyte transmigration. ICAM-1 is also expressed in other cells including macrophages; however, the role of this adhesion molecule in mediating macrophage functions remains enigmatic. We report that ICAM-1 regulates macrophage polarization by positively modulating miR-124 expression. We found higher expression levels of monocyte chemotactic protein-1 in lungs of mice lacking ICAM-1...
December 19, 2017: Oncotarget
Hatem A Elshabrawy, Michael V Volin, Abdul B Essani, Zhenlong Chen, Iain B McInnes, Katrien Van Raemdonck, Karol Palasiewicz, Shiva Arami, Mark Gonzalez, Hossam M Ashour, Seung-Jae Kim, Guofei Zhou, David A Fox, Shiva Shahrara
IL-11 has been detected in inflamed joints; however, its role in the pathogenesis of arthritis is not yet clear. Studies were conducted to characterize the expression and functional significance of IL-11 and IL-11Rα in rheumatoid arthritis (RA). IL-11 levels were elevated in RA synovial fluid (SF) compared to osteoarthritis (OA) SF and plasma from RA, OA and normal individuals (NLs). Morphologic studies established that IL-11 was detected in lining fibroblasts and macrophages in addition to sublining endothelial cells and macrophages at higher levels in RA compared to NL synovial tissues...
January 11, 2018: Angiogenesis
Takanori Sobue, Martinna Bertolini, Angela Thompson, Douglas E Peterson, Patricia I Diaz, Anna Dongari-Bagtzoglou
Oral mucositis is a common side effect of cancer chemotherapy, with significant adverse impact on the delivery of anti-neoplastic treatment. There is lack of consensus regarding the role of oral commensal microorganisms in the initiation or progression of mucositis since relevant experimental models are non-existent. The goal of this study was to develop an in vitro mucosal injury model that mimics chemotherapy-induced mucositis, where the effect of oral commensals can be studied. A novel organotypic model of chemotherapy-induced mucositis was developed based on a human oral epithelial cell line and a fibroblast-embedded collagen matrix...
January 4, 2018: Molecular Oral Microbiology
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