Abstract:
BACKGROUND:Antigen B (EgAgB) is an abundant lipoprotein released by the larva of the cestode Echinococcus granulosus into the host tissues. Its protein moiety belongs to the cestode-specific family known as hydrophobic ligand binding protein (HLBP), and is encoded by five gene subfamilies (EgAgB8/1-EgAgB8/5). The functions of EgAgB in parasite biology remain unclear. It may play a role in the parasite's lipid metabolism since it carries host lipids that E. granulosus is unable to synthesise. On the other hand, there is evidence supporting immuno-modulating activities in EgAgB, particularly on innate immune cells. Both hypothetical functions might involve EgAgB interactions with monocytes and macrophages, which have not been formally analysed yet. METHODS:EgAgB binding to monocytes and macrophages was studied by flow cytometry using inflammation-recruited peritoneal cells and the THP-1 cell line. Involvement of the protein and phospholipid moieties in EgAgB binding to cells was analysed employing lipid-free recombinant EgAgB subunits and phospholipase D treated-EgAgB (lacking the polar head of phospholipids). Competition binding assays with plasma lipoproteins and ligands for lipoprotein receptors were performed to gain information about the putative EgAgB receptor(s) in these cells. Arginase-I induction and PMA/LPS-triggered IL-1β, TNF-α and IL-10 secretion were examined to investigate the outcome of EgAgB binding on macrophage response. RESULTS:Monocytes and macrophages bound native EgAgB specifically; this binding was also found with lipid-free rEgAgB8/1 and rEgAgB8/3, but not rEgAgB8/2 subunits. EgAgB phospholipase D-treatment, but not the competition with phospholipid vesicles, caused a strong inhibition of EgAgB binding activity, suggesting an indirect contribution of phospholipids to EgAgB-cell interaction. Furthermore, competition binding assays indicated that this interaction may involve receptors with affinity for plasma lipoproteins. At functional level, the exposure of macrophages to EgAgB induced a very modest arginase-I response and inhibited PMA/LPS-mediated IL-1β and TNF-α secretion in an IL-10-independent manner. CONCLUSION:EgAgB and, particularly its predominant EgAgB8/1 apolipoprotein, are potential ligands for monocyte and macrophage receptors. These receptors may also be involved in plasma lipoprotein recognition and induce an anti-inflammatory phenotype in macrophages upon recognition of EgAgB.
journal_name
Parasit Vectorsjournal_title
Parasites & vectorsauthors
Silva-Álvarez V,Folle AM,Ramos AL,Kitano ES,Iwai LK,Corraliza I,Córsico B,Ferreira AMdoi
10.1186/s13071-016-1350-7subject
Has Abstractpub_date
2016-02-04 00:00:00pages
69issn
1756-3305pii
10.1186/s13071-016-1350-7journal_volume
9pub_type
杂志文章abstract:BACKGROUND:Plasmodium ovale is widely distributed across tropical regions and has two closely related but distinct species, namely P. ovale curtisi and P. ovale wallikeri. Combining genetic characterization with the immunogenicity of merozoite surface protein-8 (MSP-8) supports considering MSP-8 as a candidate target f...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3412-0
更新日期:2019-04-11 00:00:00
abstract:: Canine leishmaniosis is widespread in South America, where a number of Leishmania species have been isolated or molecularly characterised from dogs. Most cases of canine leishmaniosis are caused by Leishmania infantum (syn. Leishmania chagasi) and Leishmania braziliensis. The only well-established vector of Leishmani...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-2-S1-S1
更新日期:2009-03-26 00:00:00
abstract:BACKGROUND:The action of chemical compounds on the Palaearctic tick D. reticulatus (Fabricius) (Acari: Amblyomminae) has been poorly investigated so far. Therefore, the effects of application of permethrin on engorged D. reticulatus females have been assessed, and the survival rate for the different developmental stage...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-7-18
更新日期:2014-01-10 00:00:00
abstract:BACKGROUND:The mosquito Aedes aegypti, vector of dengue fever, is a target for control by entomopathogenic fungi. Recent studies by our group have shown the susceptibility of adult A. aegypti to fungal infection by Metarhizium anisopliae. This fungus is currently being tested under field conditions. However, it is unkn...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-4-91
更新日期:2011-05-26 00:00:00
abstract:BACKGROUND:The Smad proteins function in TGF-β signalling transduction. In the model nematode Caenorhabditis elegans, the co-Smad, DAF-3 mediates R-Smads and performs a central role in DAF-7 signal transduction, regulating dauer formation and reproductive processes. Considering the divergent evolutionary patterns of th...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3855-3
更新日期:2019-12-27 00:00:00
abstract:BACKGROUND:The protozoan Giardia duodenalis is a common but highly diverse human parasite that comprises a complex of seven morphologically identical genetic assemblages, further divided into sub-assemblages. There is very little information available on the diversity of Giardia sub-assemblages and multi-locus genotype...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-1059-z
更新日期:2015-09-04 00:00:00
abstract:BACKGROUND:The low prevalence of blood parasites in some bird species may be related to the habitats they frequent, the inexistence of the right host-parasite assemblage or the immunological capacity of the host. Here, we assess the parasite load of breeding populations of Eleonora's falcon (Falco eleonorae), a medium-...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-0802-9
更新日期:2015-03-31 00:00:00
abstract:BACKGROUND:In the Eastern and Upper Midwestern regions of North America, Ixodes scapularis (L.) is the most abundant tick species encountered by humans and the primary vector of B. burgdorferi, whereas in the southeastern region Amblyomma americanum (Say) is the most abundant tick species encountered by humans but cann...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-5-139
更新日期:2012-07-10 00:00:00
abstract:BACKGROUND:Zoonotic leishmaniosis, caused by the protozoan Leishmania infantum, is a public and animal health problem in Asia, Central and South America, the Middle East and the Mediterranean Basin. Several phlebotomine sand fly species from the subgenus Larroussius are vectors of L. infantum. Data from dogs living in ...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3376-0
更新日期:2019-03-26 00:00:00
abstract:BACKGROUND:Human babesiosis is an infectious disease that is epidemic in various regions all over the world. The predominant causative pathogen of this disease is the intra-erythrocytic parasite Babesia microti. The thioredoxin system is one of the major weapons that is used in the resistance to the reactive oxygen spe...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-018-2619-9
更新日期:2018-01-15 00:00:00
abstract:BACKGROUND:Giardia duodenalis is a flagellated parasite that causes diarrhea in humans and other animals. Although G. duodenalis is found in companion animals worldwide, information regarding the prevalence and genetic characteristics of G. duodenalis in pet chipmunks in China is limited. The present study therefore ai...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-018-2790-z
更新日期:2018-03-20 00:00:00
abstract:BACKGROUND:The protozoan parasite Trichomonas vaginalis is the most common non-viral, sexually transmitted pathogen. Although T. vaginalis is highly prevalent among women in Kenya, there is lack of data regarding genetic diversity of isolates currently in circulation in Kenya. METHODS:Typing was performed on 22 clinic...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2496-7
更新日期:2017-10-30 00:00:00
abstract:BACKGROUND:Lymphatic filariasis (LF) is a debilitating disease associated with extensive disfigurement and is one of a diverse group of diseases referred to as neglected tropical diseases (NTDs) which mainly occur among the poorest populations. In line with global recommendations to eliminate LF, Kenya launched its LF ...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2044-5
更新日期:2017-02-22 00:00:00
abstract:BACKGROUND:Toxoplasma gondii is a widely prevalent protozoan parasite that causes serious toxoplasmosis in humans and animals. The present study aimed to determine the genetic diversity of T. gondii isolates from pigs in Jiangxi, Sichuan, Guangdong Provinces and Chongqing Municipality in China using multilocous polymer...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-6-227
更新日期:2013-08-07 00:00:00
abstract:BACKGROUND:Cathepsin cysteine proteases play multiple roles in the life cycle of parasites such as food uptake, immune invasion and pathogenesis, making them valuable targets for diagnostic assays, vaccines and drugs. The purpose of this study was to identify a cathepsin B of Clonorchis sinensis (CsCB) and to investiga...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-4-149
更新日期:2011-07-27 00:00:00
abstract:BACKGROUND:The transmission of malaria is heterogeneous, and varies due to altitude. The information on whether the transmission of malaria is indigenous or imported to highland areas is scarce. Therefore, this study aimed to assess the species composition and infection rates of Anopheles at different altitudinal trans...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2288-0
更新日期:2017-07-19 00:00:00
abstract:BACKGROUND:NOD-like receptor protein 3 (NLRP3) inflammasome was reported as expressed in schistosomiasis-induced liver fibrosis (SSLF). We used an NLRP3 inflammasome inhibitor, MCC950, to investigate whether it inhibited liver fibrosis, and explored the preliminary molecular mechanism. METHODS:BALB/c mice were infecte...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-018-3223-8
更新日期:2019-01-11 00:00:00
abstract:BACKGROUND:In Brazil, the autochthonous transmission of extra-Amazonian malaria occurs mainly in areas of the southeastern coastal Atlantic Forest, where Anopheles cruzii is the primary vector. In these locations, the population density of the mosquito varies with altitude (5-263 m above sea level), prompting us to hyp...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-014-0581-8
更新日期:2014-12-16 00:00:00
abstract:BACKGROUND:Understanding the variation in prevalence of Borrelia burgdorferi sensu lato (Lyme Borreliosis Spirochaetes, LBS) and Anaplasma phagocytophilum (causing tick-borne fever in ruminants and human granulocytic ehrlichiosis) in ticks is vital from both a human and an animal disease perspective to target the most ...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-6-187
更新日期:2013-06-20 00:00:00
abstract:BACKGROUND:Diagnostics provide a means to measure progress toward disease elimination. Many countries in Africa are approaching elimination of onchocerciasis after successful implementation of mass drug administration programs as well as vector control. An understanding of how markers for infection such as skin snip mi...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1623-1
更新日期:2016-06-13 00:00:00
abstract:BACKGROUND:Insect-specific viruses do not replicate in vertebrate cells, but persist in mosquito populations and are highly prevalent in nature. These viruses may naturally regulate the transmission of pathogenic vertebrate-infecting arboviruses in co-infected mosquitoes. Following the isolation of the first Australian...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1683-2
更新日期:2016-07-25 00:00:00
abstract:BACKGROUND:Post-mass drug administration (MDA) surveillance during the lymphatic filariasis (LF) elimination program in Sri Lanka, revealed the re-emergence of brugian filariasis after four decades. This study was done with the objectives of investigating the epidemiology and age-specific vulnerability to infection. Su...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-018-2649-3
更新日期:2018-01-29 00:00:00
abstract::Trypanosoma rangeli is a protozoan that is non-pathogenic for humans and other mammals but causes pathology in the genus Rhodnius. T. rangeli and R. prolixus is an excellent model for studying the parasite-vector interaction, but its cycle in invertebrates remains unclear. The vector becomes infected on ingesting bloo...
journal_title:Parasites & vectors
pub_type: 杂志文章,评审
doi:10.1186/1756-3305-5-105
更新日期:2012-05-30 00:00:00
abstract:BACKGROUND:Estimating the abundance of Culicoides using light traps is influenced by a large variation in abundance in time and place. This study investigates the optimal trapping strategy to estimate the abundance or presence/absence of Culicoides on a field with grazing animals. We used 45 light traps to sample speci...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-6-151
更新日期:2013-05-24 00:00:00
abstract:BACKGROUND:Taenia multiceps is a harmful tapeworm and its larval form (coenurus cerebralis) is the causative agent of coenurosis, a disease affecting the health of herbivores, resulting in great economic loss to animal husbandry. Heat-shock proteins (HSPs), expressed in all prokaryotes and eukaryotes, act as molecular ...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3352-8
更新日期:2019-03-12 00:00:00
abstract:BACKGROUND:In East Africa, animal trypanosomiasis is caused by many tsetse transmitted protozoan parasites including Trypanosoma vivax, T. congolense and subspecies of T. brucei s.l. (T. b. brucei and zoonotic human infective T. b. rhodesiense) that may co-circulate in domestic and wild animals. Accurate species-specif...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-3-82
更新日期:2010-09-06 00:00:00
abstract:BACKGROUND:An active immune surveillance and a range of barriers to infection allow the host to effectively eliminate microbial pathogens. However, pathogens may use diverse strategies to subdue such host defences. For instance, one such mechanism is the use of leucine-rich repeat (LRR) proteins by pathogens (microbial...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1842-5
更新日期:2016-10-21 00:00:00
abstract:BACKGROUND:Blood-feeding is a common strategy among parasitizing arthropods, including the ectoparasitic salmon louse (Lepeophtheirus salmonis), feeding off its salmon host's skin and blood. Blood is rich in nutrients, among these iron and heme. These are essential molecules for the louse, yet their oxidative propertie...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-020-04096-0
更新日期:2020-05-06 00:00:00
abstract:BACKGROUND:Schistosomiasis, caused by schistosomes, is one of the most prevalent and serious parasitic diseases in tropical and subtropical countries. This pathogen has a complex life cycle and harbors a unique repertoire of genes expressed at different life-stages. Understanding the gene regulation of schistosomes wil...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-1203-9
更新日期:2015-11-14 00:00:00
abstract:BACKGROUND:Schistosome and soil-transmitted helminth (STH) infections are recognized as major global public health problems, causing severe and subtle morbidity, including significant educational and nutritional effects in children. Although effective and safe drugs are available, ensuring access to these drugs by all ...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-5-182
更新日期:2012-08-31 00:00:00