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https://www.readbyqxmd.com/read/29761104/platelets-in-immune-response-to-virus-and-immunopathology-of-viral-infections
#1
REVIEW
Eugenio D Hottz, Fernando A Bozza, Patrícia T Bozza
Platelets are essential effector cells in hemostasis. Aside from their role in coagulation, platelets are now recognized as major inflammatory cells with key roles in the innate and adaptive arms of the immune system. Activated platelets have key thromboinflammatory functions linking coagulation to immune responses in various infections, including in response to virus. Recent studies have revealed that platelets exhibit several pattern recognition receptors (PRR) including those from the toll-like receptor, NOD-like receptor, and C-type lectin receptor family and are first-line sentinels in detecting and responding to pathogens in the vasculature...
2018: Frontiers in Medicine
https://www.readbyqxmd.com/read/29743762/thromboelastographic-analysis-of-hemostatic-abnormalities-in-dengue-patients-admitted-in-a-multidisciplinary-intensive-care-unit-a-cross-sectional-study
#2
V K Sureshkumar, Deepak Vijayan, Shamim Kunhu, Zuhail Mohamed, Sujith Thomas, Muraleedharan Raman
Background: Dengue fever is an important tropical infection causing significant mortality. The pathophysiology of hematological abnormalities in dengue remains poorly studied. In this study, we analyzed the hematological abnormalities by thromboelastography (TEG). Methods: This cross-sectional study evaluated complicated dengue patients with TEG. Thromboelastographic variables were categorized into six patterns: factor deficiency, platelet dysfunction, enzymatic hypercoagulability, combined enzymatic and platelet hypercoagulability, primary fibrinolysis, and secondary hyperfibrinolysis...
April 2018: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/29686179/the-autoimmune-mechanism-in-dengue-hemorrhagic-fever
#3
Soroy Lardo, Marsetyawan Hne Soesatyo, Juffrie Juffrie, Sitti Rahmah Umniyati
The immune response of dengue fever/dengue hemorrhagic fever is a series of immunopathogenesis processes starting from viral infection to the target on monocytes and macrophages. It may consequently cause a cascade of viremia in the circulation that stimulates the afferent, efferent, and effector mechanism by the interaction of the humoral and complement system. The cascade results in inflammatory substance that will affect capillary permeability and activate coagulation factors leading to further effects on endothelial level...
January 2018: Acta Medica Indonesiana
https://www.readbyqxmd.com/read/29301573/dengue-virus-causes-changes-of-microrna-genes-regulatory-network-revealing-potential-targets-for-antiviral-drugs
#4
Mohamed Shahen, Zihu Guo, Akhtar Hussain Shar, Reham Ebaid, Qin Tao, Wenjuan Zhang, Ziyin Wu, Yaofei Bai, Yingxue Fu, Chunli Zheng, He Wang, Piar Ali Shar, Jianling Liu, Zhenzhong Wang, Wei Xiao, Yonghua Wang
BACKGROUND: Dengue virus (DENV) is an increasing global health threat and associated with induction of both a long-lived protective immune response and immune-suppression. So far, the potency of treatment of DENV via antiviral drugs is still under investigation. Recently, increasing evidences suggest the potential role of microRNAs (miRNAs) in regulating DENV. The present study focused on the function of miRNAs in innate insusceptible reactions and organization of various types of immune cells and inflammatory responses for DENV...
January 4, 2018: BMC Systems Biology
https://www.readbyqxmd.com/read/29221616/dengue-fever-report-from-the-task-force-on-tropical-diseases-by-the-world-federation-of-societies-of-intensive-and-critical-care-medicine
#5
REVIEW
Pravin Amin, Özlem Acicbe, Jorge Hidalgo, Juan Ignacio Silesky Jiménez, Tim Baker, Guy A Richards
Dengue is an arbovirus affecting humans and spread by mosquitoes. Severe dengue follows a secondary infection with a different virus serotype. The problem is truly global as it is endemic in over 100 countries. Severe dengue can be a life-threatening because of increased vascular permeability, resulting in leakage of fluid from the intravascular compartment to the extravascular space. When major bleeding does occur, it is almost invariably combined with profound shock since this, in combination with thrombocytopenia, hypoxia, and acidosis, can lead to multiple organ failure and disseminated intravascular coagulation...
February 2018: Journal of Critical Care
https://www.readbyqxmd.com/read/29142540/clinical-audit-of-dengue-related-deaths-in-2011-mayo-hospital-lahore-pakistan
#6
Somia Iqtadar, Nabeel Akbar, Mehreen Mehmood, Sajid Abaidullah
Background and Objective: Dengue infection has evolved into an epidemic during last few years in Pakistan and has been associated with poor outcomes. Literature with respect to mortality risk factors in Dengue infection is not sufficient. This compelled us to conduct this study to find out major contributory factors to death in patients with dengue viral infection at one of Asia's ancient hospital setting with an aim to recognize complications at earliest and improve case management in future...
September 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29067074/profile-of-hepatic-involvement-in-dengue-infections-in-adult-pakistani-population
#7
Somia Iqtadar, Nabeel Akbar, Naima Huma, Fawad Ahmad Randhawa
OBJECTIVES: To estimate the range of hepatic involvement in dengue infections by assessing clinical and biochemical profile of adult dengue infected patients. METHODS: Serologically confirmed 220 adult cases of dengue infections admitted to Mayo hospital from June 2013 to November 2013 were classified as having dengue fever, dengue haemorragic fever and dengue shock syndrome. The frequency and range of bilirubin, liver enzymes derangement and presence of liver enlargement in each group was calculated and further stratified according to age and gender...
July 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28945165/dengue-virus-and-its-relation-to-human-glycoprotein-iib-iiia-revealed-by-fluorescence-microscopy-and-flow-cytometry
#8
Nattapol Attatippaholkun, Yaowalak U-Pratya, Panthipa Supraditaporn, Chanchao Lorthongpanich, Kovit Pattanapanyasat, Surapol Issaragrisil
Understanding dengue virus (DENV)-induced hemorrhage remains a challenging jigsaw puzzle with many pieces missing to understand the complex interactions between DENV and blood coagulation system. To use flow cytometry studying the interactions between DENV and human platelet aggregation receptor, glycoprotein IIb/IIIa (gpIIb/IIIa), directly conjugated fluorochrome monoclonal antibody (mAb) is essential to facilitate multifluorochrome immunostaining. However, the obstacle was that no directly conjugated fluorochrome-anti-DENV mAb had been commercially available...
November 2017: Viral Immunology
https://www.readbyqxmd.com/read/28808809/evidence-of-dengue-virus-replication-in-a-non-traumatic-spleen-rupture-case
#9
Luiz José de Souza, João de Azevedo, Liza Ingride Acha Kohler, Lorena de Freitas Barros, Mariana Arêdes Lima, Emiliana Mandarano Silva, Ronaldo Mohana-Borges, Priscila Conrado Guerra Nunes, Marciano Viana Paes
The present report describes a case of splenic rupture due to dengue, a rare complication of dengue that should be considered in any patient with suspected dengue disease who started with left upper quadrant abdominal pain and hypotension. The pathophysiology of this entity is not yet well elucidated, but one of the theories present in the literature is that it is due to a depletion of coagulation factors and platelets leading to intra-splenic hemorrhage and rupture. The RT-PCR technique detected serotype 1 and histopathological studies of the spleen revealed significant atrophy of lymphoid follicles and extensive hemorrhage areas...
November 2017: Archives of Virology
https://www.readbyqxmd.com/read/28596655/a-correlation-of-the-platelet-count-with-d-dimer-levels-as-an-indicator-for-component-therapy-in-children-with-dengue-hemorrhagic-fever
#10
Arthi Sridhar, B M Sunil Kumar, Aarathi Rau, A T K Rau
Dengue Fever (DF) may evolve into two life threatening forms-Dengue Hemorrhagic Fever (DHF) and Dengue Shock Syndrome (DSS). DHF is associated with increased vascular permeability and plasma leakage causing thrombocytopenia and loss of clotting factors into the third space and may result in bleeding initially due to thrombocytopenia and later due to disseminated intravascular coagulation (DIC), often as a terminal event. Prompt recognition and treatment of minor bleeds in DF children with incipient DIC with component therapy may be associated with improved survival while failure to do so is usually catastrophic...
June 2017: Indian Journal of Hematology & Blood Transfusion
https://www.readbyqxmd.com/read/28539856/natural-regulatory-anticoagulants-proteins-among-sudanese-patients-with-dengue-virus-infection
#11
Bashir Abdrhman Bashir, Osman Khalaf Allah Saeed
THE COAGULATION SYSTEM: Abnormalities in natural physiologic anticoagulants are observed in dengue infection. Laboratory values such as protein C (PC), protein S (PS), and antithrombin (AT) indicate this problem on the coagulation system in dengue. Recently, an interrelationship between dengue and the levels of natural anticoagulants has been observed. OBJECTIVE: The study conducted to find out the effect of dengue on the natural anticoagulant proteins. METHODS: A case-control study was conducted in Port Sudan Teaching Hospital from February 2013 to June 2014 for 334 cases of dengue caused by dengue virus, 217 (65%) males and 117 (35%) were females along with 101 cases of control 64 (63...
April 2017: International Journal of Health Sciences
https://www.readbyqxmd.com/read/28405192/induction-of-osteopontin-by-dengue-virus-3-infection-in-thp-1-cells-inhibition-of-the-synthesis-by-brefelamide-and-its-derivative
#12
Dyshelly N Pascapurnama, Hannah K M Labayo, Isolde Dapat, Divya D Nagarajegowda, Jingge Zhao, Jing Zhang, Osamu Yamada, Haruhisa Kikuchi, Shinichi Egawa, Yoshiteru Oshima, Haorile Chagan-Yasutan, Toshio Hattori
Osteopontin (OPN) is a multifunctional matricellular protein produced by a broad range of cells including osteoclasts, macrophages, T cells, endothelial cells, and vascular smooth muscle cells. OPN modulates various physiological and pathological events such as inflammation, wound healing, and bone formation and remodeling. Dengue virus (DENV) infection causes an increase in plasma OPN levels, which is correlated with the severity of symptoms and coagulation abnormalities. DENV infection also induces OPN gene expression in human macrophages...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28103832/thromboelastometry-analysis-of-thrombocytopenic-dengue-patients-a-cross-sectional-study
#13
Felipe Maia de Toledo Piza, Thiago Domingos Corrêa, Alexandre Rodrigues Marra, João Carlos Campos Guerra, Roseny Dos Reis Rodrigues, Andrea Aparecida Rocco Villarinho, Valdir Fernandes de Aranda, Sandra Christina Pereira Lima Shiramizo, Maria Roza de Jesus de Lima, Esper Georges Kallas, Alexandre Biasi Cavalcanti
BACKGROUND: Dengue virus infection (DVI) is a prevalent and potentially fatal viral disease associated with coagulopathy. So far, the coagulation profile of DVI patients with thrombocytopenia has not been assessed through a viscoelastic test such as rotational thromboelastometry. We aimed to describe the prevalence and characteristics of coagulation abnormalities in dengue fever outpatients with thrombocytopenia, addressed by both rotational thromboelastometry and conventional coagulation tests...
January 19, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28060934/a-cohort-study-of-adult-patients-with-severe-dengue-in-taiwanese-intensive-care-units-the-elderly-and-aptt-prolongation-matter-for-prognosis
#14
Chih-Cheng Hsieh, Cong-Tat Cia, Jen-Chieh Lee, Junne-Ming Sung, Nan-Yao Lee, Po-Lin Chen, Te-Hui Kuo, Jo-Yen Chao, Wen-Chien Ko
BACKGROUND: There was a large dengue outbreak in Taiwan in 2015, in which the ages of the affected individuals were higher than those in other countries. The aim of this study was to explore the characteristics and prognostic factors for adults with severe dengue in intensive care units (ICUs). METHODS: All adults admitted to ICUs with dengue virus infection (DENV) at a medical center from July 1, 2015 to December 31, 2015 were enrolled. DENV was diagnosed by the presence of serum NS1 antigen, IgM antibodies to dengue virus, or dengue virus RNA by real-time reverse transcriptase polymerase chain reaction...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27986543/magnitude-of-viremia-antigenemia-and-infection-of-circulating-monocytes-in-children-with-mild-and-severe-dengue
#15
Federico Perdomo-Celis, Doris M Salgado, Carlos F Narváez
Dengue is a major public health problem in tropical regions around the world. Viral and immune host factors determine the clinical courses of the infection. We analyzed the dynamics of viremia (by real-time polymerase chain reactions), antigenemia (through detection of the viral non-structural protein [NS]-1 by enzyme-linked immunosorbent assays) and the frequency of virus-infected peripheral blood mononuclear cells (PBMCs) (by multiparametric flow cytometry) in children with primary or secondary dengue virus (DENV) infection in mild to severe cases...
March 2017: Acta Tropica
https://www.readbyqxmd.com/read/27730774/infections-and-thrombocytopenia
#16
EDITORIAL
Falguni Parikh
Febrile patient with thrombocytopenia is commonly encountered by physicians especially during monsoon and perimonsoon period. Infections with protozoa, bacteria and viruses can cause thrombocytopenia with or without disseminated intravascular coagulation. Commonly dengue, malaria, scrub typhus and other rickettsial infections, meningococci, leptospira and certain viral infections present as fever with thrombocytopenia. Occasionally these patients can go on to develop a stormy course with multiorgan dysfunction requiring intensive care unit admission associated with high morbidity and mortality...
February 2016: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/27713875/symmetrical-peripheral-gangrene-unusual-complication-of-dengue-fever
#17
M L Patel, Rekha Sachan, Amita Verma, Radhey Shyam
Symmetrical peripheral gangrene (SPG) is a rare clinical entity, infective, and noninfective both types of etiologies are responsible. The basic underlying pathology in SPG is being disseminated intravascular coagulation and carries a high mortality. Here, we describe a 52-year-old male with dengue fever, who developed bilateral symmetrical dry gangrene of both hand and feet. His dengue IgM antibody was positive. All the peripheral pulses of the affected limbs were palpable. Color Doppler study of upper and lower limb vessels showed normal flow...
2016: Advanced Biomedical Research
https://www.readbyqxmd.com/read/27592310/increased-circulating-procoagulant-and-anticoagulant-factors-as-tf-and-tfpi-according-to-severity-or-infecting-serotypes-in-human-dengue-infection
#18
Elzinandes Leal de Azeredo, Victor Edgar Fiestas Solórzano, Débora Batista de Oliveira, Cintia Ferreira Marinho, Luiz José de Souza, Rivaldo Venâncio da Cunha, Paulo Vieira Damasco, Claire Fernandes Kubelka, Luzia Maria de-Oliveira-Pinto
Tissue Factor (TF) is the initiator of coagulation and Tissue Factor Inhibitor (TFPI) is the physiological inhibitor of the TF/FVIIa complex. Circulating levels of TF and TFPI were quantified in dengue patients and the relationships with disease severity and infecting serotype analysed. A significant decrease in TF and TPFI plasma levels was observed in mild DF patients compared with severe dengue. Furthermore, both factors were associated with haemorrhagic manifestations. Finally, TF levels were significantly increased in DENV-1/2 infected patients as compared with DENV-4...
January 2017: Microbes and Infection
https://www.readbyqxmd.com/read/27546535/modeling-dengue-virus-hepatic-cell-interactions-using-human-pluripotent-stem-cell-derived-hepatocyte-like-cells
#19
Jianshe Lang, Daniel Vera, Yichen Cheng, Hengli Tang
The development of dengue antivirals and vaccine has been hampered by the incomplete understanding of molecular mechanisms of dengue virus (DENV) infection and pathology, partly due to the limited suitable cell culture or animal models that can capture the comprehensive cellular changes induced by DENV. In this study, we differentiated human pluripotent stem cells (hPSCs) into hepatocytes, one of the target cells of DENV, to investigate various aspects of DENV-hepatocyte interaction. hPSC-derived hepatocyte-like cells (HLCs) supported persistent and productive DENV infection...
September 13, 2016: Stem Cell Reports
https://www.readbyqxmd.com/read/27365652/diagnosing-disseminated-intravascular-coagulation-in-acute-infection-can-we-do-without-fdp-d-dimer
#20
M M Arora, K B Mishra, Velu Nair, J R Bhardwaj, Rajvir Bhalwar, B L Somani
Alterations in coagulation profile viz. platelet count, prothrombin time (PT), partial thromboplastin time with kaolin (PTTK), thrombin time (TT) and fibrinogen were studied in 96 patients (73 males and 23 females) of acute infections. Fibrin/fibrinogen degradation products (FDP) level >25µg fibrinogen equivalent unit (FEU)/ml along-with D-dimer >1.0µg FEU/ml was considered criteria for diagnosis of disseminated intravascular coagulation (DIC). Normal values were established using plasma from 12 healthy voluntary blood donors...
January 2002: Medical Journal, Armed Forces India
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