Read by QxMD icon Read

Monocyte malaria

Cheryl Sarah Philipose, T Umashankar
INTRODUCTION: Malaria is a mosquito borne disease which is a major public health problem and a leading cause of morbidity and mortality worldwide. Various haematological parameters have been studied to help predict malaria, such as alteration in the leucocyte count, platelet counts and erythrocyte counts. The neutrophil lymphocyte count ratio (NLCR) was found to have a good predictive value in systemic inflammation, particularly in critical care setting. AIMS AND OBJECTIVES: The present study aims to study the various haematological parameters and acertain the predictive value of NLCR and MLR in the detection of malaria...
July 2016: Tropical Parasitology
Abhik Saha, Sejal Chauhan, Tamishraha Bagchi
BACKGROUND: Recombinant proteins and vaccine candidates of Plasmodium vivax have met with limited success. One of the reasons could be their effect on monocytes which are important in malaria pathogenesis. Our aim was therefore to investigate the effect of selected recombinant malarial proteins on monocytes functions. METHODS: Phagocytosis rate and respiratory burst of healthy individuals' monocytes treated with antigens were examined. The homing capacity of monocytes was studied by examining the mRNA level of chemokine receptors from patients and healthy individuals...
August 2016: Transactions of the Royal Society of Tropical Medicine and Hygiene
Mary F Fontana, Alyssa Baccarella, Joshua F Craft, Michelle J Boyle, Tara I McIntyre, Matthew D Wood, Kurt S Thorn, Chioma Anidi, Aqieda Bayat, Me Ree Chung, Rebecca Hamburger, Chris Y Kim, Emily Pearman, Jennifer Pham, Jia J Tang, Louis Boon, Moses R Kamya, Grant Dorsey, Margaret E Feeney, Charles C Kim
In humans, immunity to Plasmodium sp. generally takes the form of protection from symptomatic malaria (i.e., 'clinical immunity') rather than infection ('sterilizing immunity'). In contrast, mice infected with Plasmodium develop sterilizing immunity, hindering progress in understanding the mechanistic basis of clinical immunity. Here we present a novel model in which mice persistently infected with P. chabaudi exhibit limited clinical symptoms despite sustaining patent parasite burdens for many months. Characterization of immune responses in persistently infected mice revealed development of CD4+ T cell exhaustion, increased production of IL-10, and expansion of B cells with an atypical surface phenotype...
2016: PloS One
Yury Oliveira Chaves, Allyson Guimarães da Costa, Marcelo Luís Monteiro Pereira, Marcus Vinícius Guimarães de Lacerda, Jordana Grazziela Coelho-Dos-Reis, Olindo Assis Martins-Filho, Andréa Teixeira-Carvalho, Adriana Malheiro, Wuelton Marcelo Monteiro, Patrícia Puccinelli Orlandi, Claudio Romero Farias Marinho, Paulo Afonso Nogueira
BACKGROUND: Plasmodium vivax is the causative agent of human malaria of large geographic distribution, with 35 million cases annually. In Brazil, it is the most prevalent species, being responsible by around 70 % of the malaria cases. METHODS: A cross-sectional study was performed in Manaus (Amazonas, Brazil), including 36 adult patients with primary malaria, 19 with recurrent malaria, and 20 endemic controls. The ex vivo phenotypic features of circulating leukocyte subsets (CD4(+) T-cells, CD8(+) T-cells, NK, NKT, B, B1 and Treg cells) as well as the plasmatic cytokine profile (IL-2, IL-4, IL-6, IL-10, TNF and IFN-γ) were assessed, aiming at establishing patterns of immune response characteristic of primary malaria vs recurrent malaria as compared to endemic controls...
2016: Malaria Journal
Kyle D Wilson, Sonja J Stutz, Lorenzo F Ochoa, Gustavo A Valbuena, Petra D Cravens, Kelly T Dineley, Gracie Vargas, Robin Stephens
BACKGROUND: Cerebral malaria is one of the most severe complications of Plasmodium falciparum infection and occurs mostly in young African children. This syndrome results from a combination of high levels of parasitaemia and inflammation. Although parasite sequestration in the brain is a feature of the human syndrome, sequestering strains do not uniformly cause severe malaria, suggesting interplay with other factors. Host genetic factors such as mutations in the promoters of the cytokines IL-10 and TNF are also clearly linked to severe disease...
2016: Malaria Journal
Isaclaudia G de Azevedo-Quintanilha, Adriana Vieira-de-Abreu, André Costa Ferreira, Daniele O Nascimento, Alessandra M Siqueira, Robert A Campbell, Tatiana P Teixeira Ferreira, Tatiana M Gutierrez, Gabriel M Ribeiro, Patricia M R E Silva, Alysson R Carvalho, Patricia T Bozza, Guy A Zimmerman, Hugo C Castro-Faria-Neto
BACKGROUND: Malaria-associated acute respiratory distress syndrome (MA-ARDS) is a potentially lethal complication of clinical malaria. Acute lung injury in MA-ARDS shares features with ARDS triggered by other causes, including alveolar inflammation and increased alveolar-capillary permeability, leading to leak of protein-rich pulmonary oedema fluid. Mechanisms and physiologic alterations in MA-ARDS can be examined in murine models of this syndrome. Integrin αDβ2 is a member of the leukocyte, or β2 (CD18), sub-family of integrins, and emerging observations indicate that it has important activities in leukocyte adhesion, accumulation and signalling...
2016: Malaria Journal
Esther Dalko, Nicolas Tchitchek, Laurent Pays, Fabien Herbert, Pierre-André Cazenave, Balachandran Ravindran, Shobhona Sharma, Serge Nataf, Bidyut Das, Sylviane Pied
Cerebral malaria (CM) caused by Plasmodium falciparum parasites often leads to the death of infected patients or to persisting neurological sequelae despite anti-parasitic treatments. Erythropoietin (EPO) was recently suggested as a potential adjunctive treatment for CM. However diverging results were obtained in patients from Sub-Saharan countries infected with P. falciparum. In this study, we measured EPO levels in the plasma of well-defined groups of P. falciparum-infected patients, from the state of Odisha in India, with mild malaria (MM), CM, or severe non-CM (NCM)...
2016: PloS One
J Brice Weinberg, Alicia D Volkheimer, Matthew P Rubach, Salvatore M Florence, Jackson P Mukemba, Ayam R Kalingonji, Charles Langelier, Youwei Chen, Margaret Bush, Tsin W Yeo, Donald L Granger, Nicholas M Anstey, Esther D Mwaikambo
We earlier established that nitric oxide (NO) is protective against severe malaria and that arginine and NO levels are reduced in malaria patients. We now show that an M2-like blood monocyte phenotype is significantly associated with hypoargininemia, NO insufficiency, and disease severity in Tanzanian children with falciparum malaria. Compared to control children (n = 106), children with moderately severe (n = 77) and severe falciparum malaria (n = 129) had significantly higher mononuclear cell arginase 1 mRNA, protein, and enzyme activity; lower NOS2 mRNA; lower plasma arginine; and higher plasma IL-10, IL-13, and IL-4...
2016: Scientific Reports
Yu-Zhou Gui, Hong Yan, Fei Gao, Cong Xi, Hui-Hui Li, Yi-Ping Wang
AIM: Betulin is a pentacyclic triterpenoid isolated from the bark of yellow and white birch trees with anti-cancer and anti-malaria activities. In this study we examined the effects of betulin on atherosclerosis in apoE(-/-) mice and the underlying mechanisms. METHODS: Murine macrophage RAW 264.7 cells and human monocyte-derived THP-1 cells were tested. Foam cell formation was detected with Oil Red O staining. Cholesterol efflux was assessed using [(3)H]-cholesterol efflux assay...
July 4, 2016: Acta Pharmacologica Sinica
Mahamadou Diakite, Kazutoyo Miura, Ababacar Diouf, Drissa Konate, Abdoul S Keita, Saibou Doumbia, Seidina Diakite, Karim Traore, Mory Doumbouya, Jennifer M Anderson, Rick M Fairhurst, Carole A Long
Standard hematological indices are commonly used in malaria epidemiological studies to measure anemia prevalence and calculate blood parasite densities. In Africa, few studies have investigated how these indices change during a malaria transmission season and with increasing age. To address these knowledge gaps, we collected blood from 169 healthy Malian children aged 3-12 years before (May 2010) and after (January 2011) a transmission season. Red blood cell (RBC) count, hemoglobin (Hb) level, hematocrit (Ht), white blood cell (WBC) count, and WBC subsets were measured in paired blood samples, and the data were stratified by month (May, January) and age group (3-5, 6-8, and 9-12 years)...
August 3, 2016: American Journal of Tropical Medicine and Hygiene
Varun Kalra, Sohaib Ahmad, Vikas Shrivastava, Garima Mittal
BACKGROUND: A single diagnostic test for acute undifferentiated febrile illnesses (AUFI) is elusive. This pilot study was undertaken on the premise that leucocytes, being the main cells of defence, undergo quantitative, structural and functional changes in AUFI. We evaluated the potential of volume, conductivity and scatter (VCS) parameters of leucocytes, generated with the haemogram report by the Coulter auto-analyzer, in differentiating the common etiologies of AUFI. METHODS: The haematological and VCS data obtained from 800 controls and 200 cases of AUFI (50 cases each of acute malaria, dengue, scrub typhus and enteric fever) were retrieved for analysis...
May 2016: Transactions of the Royal Society of Tropical Medicine and Hygiene
Manas Kotepui, Kwuntida Uthaisar, Bhukdee PhunPhuech, Nuoil Phiwklam
BACKGROUND: This study aimed to evaluate the prevalence and alteration of hematological parameters in malaria patients with a glucose-6-phosphate dehydrogenase (G6PD) deficiency, in the western region of Thailand, an endemic region for malaria. METHODS: Data about patients with malaria hospitalized between 2013 and 2015 were collected. Clinical and sociodemographic characteristics such as age and gender, diagnosis on admission, and parasitological results were mined from medical records of the laboratory unit of the Phop Phra Hospital in Tak Province, Thailand...
April 25, 2016: Infectious Diseases of Poverty
W L Mandala, C L Msefula, E N Gondwe, M T Drayson, M E Molyneux, C A MacLennan
Malaria in malaria-naïve adults is associated with an inflammatory response characterized by expression of specific activation markers on innate immune cells. Here, we investigate activation and adhesion marker expression, and cytokine production in monocytes from children presenting with cerebral malaria (CM, n = 36), severe malarial anaemia (SMA, n = 42) or uncomplicated malaria (UM, n = 66), and healthy aparasitemic children (n = 52) in Blantyre, Malawi. In all malaria groups, but particularly in the two severe malaria groups, monocyte expression of CD11b, CD11c, CD18, HLA-DR and CD86, and percentages of TNF-α- and IL-6-producing monocytes were lower than in healthy controls, while expression of CD11a, TLR2 and TLR4 was lower in children with severe malaria compared with controls...
May 2016: Parasite Immunology
Mohamad Alaa Terkawi, Ryo Takano, Kentaro Kato
Macrophages and neutrophils are our front line of defense against invading pathogens. They are professional phagocytic cells that play a key role in the clearance of Plasmodium falciparum-parasitized erythrocytes from the host circulation. A stable in vitro culture system for these cells and parasitized erythrocytes would provide the means to study their immunological responses to infection, potentially revealing important clues for new therapeutic interventions for malaria. Here, we present an optimized protocol for cultivating human peripheral blood monocyte-derived macrophages and neutrophils with Plasmodium falciparum-parasitized erythrocytes...
March 14, 2016: Parasitology International
Marina L S Santos, Edione Cristina Reis, Pamela N Bricher, Tais N Sousa, Cristiana F A Brito, Marcus V G Lacerda, Cor J F Fontes, Luzia H Carvalho, Alessandra Pontillo
Recent reports showed that, in mice, symptomatic Plasmodium infection triggers NLRP3/NLRP12-dependent inflammasome formation and caspase-1 activation in monocytes. In humans, few works demonstrated that inflammasome is activated in malaria. As Plasmodiumvivax is a potent inducer of inflammatory response we hypothesised that inflammasome genetics might affect P. vivax malaria clinical presentation. For this purpose, selected SNPs in inflammasome genes were analysed among patients with symptomatic P. vivax malaria...
June 2016: Infection, Genetics and Evolution
Djin-Ye Oh, David J Dowling, Saima Ahmed, Hyungwon Choi, Spencer Brightman, Ilana Bergelson, Sebastian T Berger, John F Sauld, Matthew Pettengill, Alvin T Kho, Henry J Pollack, Hanno Steen, Ofer Levy
Adjuvants boost vaccine responses, enhancing protective immunity against infections that are most common among the very young. Many adjuvants activate innate immunity, some via Toll-Like Receptors (TLRs), whose activities varies with age. Accordingly, characterization of age-specific adjuvant-induced immune responses may inform rational adjuvant design targeting vulnerable populations. In this study, we employed proteomics to characterize the adjuvant-induced changes of secretomes from human newborn and adult monocytes in response to Alum, the most commonly used adjuvant in licensed vaccines; Monophosphoryl Lipid A (MPLA), a TLR4-activating adjuvant component of a licensed Human Papilloma Virus vaccine; and R848 an imidazoquinoline TLR7/8 agonist that is a candidate adjuvant for early life vaccines...
June 2016: Molecular & Cellular Proteomics: MCP
Vivek Naranbhai, Helen A Fletcher, Rachel Tanner, Matthew K O'Shea, Helen McShane, Benjamin P Fairfax, Julian C Knight, Adrian V S Hill
The ratio of monocytes and lymphocytes (ML ratio) in peripheral blood is associated with tuberculosis and malaria disease risk and cancer and cardiovascular disease outcomes. We studied anti-mycobacterial function and the transcriptome of monocytes in relation to the ML ratio. Mycobacterial growth inhibition assays of whole or sorted blood were performed and mycobacteria were enumerated by liquid culture. Transcriptomes of unstimulated CD14 + monocytes isolated by magnetic bead sorting were characterised by microarray...
November 2015: EBioMedicine
Geetha P Bansal, Corey S Weinstein, Nirbhay Kumar
During natural infection malaria parasites are injected into the bloodstream of a human host by the bite of an infected female Anopheles mosquito. Both asexual and mature sexual stages of Plasmodium circulate in the blood. Asexual forms are responsible for clinical malaria while sexual stages are responsible for continued transmission via the mosquitoes. Immune responses generated against various life cycle stages of the parasite have important roles in resistance to malaria and in reducing malaria transmission...
May 2016: Acta Tropica
Sarah E Hochman, Theresa F Madaline, Samuel C Wassmer, Emmie Mbale, Namjong Choi, Karl B Seydel, Richard O Whitten, Julie Varughese, Georges E R Grau, Steve Kamiza, Malcolm E Molyneux, Terrie E Taylor, Sunhee Lee, Danny A Milner, Kami Kim
No abstract text is available yet for this article.
2016: MBio
Fatima Brant, Aline S Miranda, Lisia Esper, Melisa Gualdrón-López, Daniel Cisalpino, Danielle da Gloria de Souza, Milene Alvarenga Rachid, Herbert B Tanowitz, Mauro Martins Teixeira, Antônio Lucio Teixeira, Fabiana Simão Machado
Plasmodium falciparum infection results in severe malaria in humans, affecting various organs, including the liver, spleen and brain, and resulting in high morbidity and mortality. The Plasmodium berghei ANKA (PbA) infection in mice closely recapitulates many aspects of human cerebral malaria (CM); thus, this model has been used to investigate the pathogenesis of CM. Suppressor of cytokine signaling 2 (SOCS2), an intracellular protein induced by cytokines and hormones, modulates the immune response, neural development, neurogenesis and neurotrophic pathways...
May 2016: Brain, Behavior, and Immunity
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"