Abstract：
:The strategies that allow Brucella abortus to persist for years inside macrophages subverting host immune responses are not completely understood. Immunity against this bacterium relies on the capacity of IFN-γ to activate macrophages, endowing them with the ability to destroy intracellular bacteria. We report here that infection with B. abortus down-modulates the expression of the type I receptor for the Fc portion of IgG (FcγRI, CD64) and FcγRI-restricted phagocytosis regulated by IFN-γ in human monocytes/macrophages. Both phenomena were not dependent on bacterial viability, since they were also induced by heat-killed B. abortus (HKBA), suggesting that they were elicited by a structural bacterial component. Accordingly, a prototypical B. abortus lipoprotein (L-Omp19), but not its unlipidated form, inhibited both CD64 expression and FcγRI-restricted phagocytosis regulated by IFN-γ. Moreover, a synthetic lipohexapeptide that mimics the structure of the protein lipid moiety also inhibited CD64 expression, indicating that any Brucella lipoprotein could down-modulate CD64 expression and FcγRI-restricted phagocytosis. Pre-incubation of monocytes/macrophages with anti-TLR2 mAb blocked the inhibition of the CD64 expression mediated by HKBA and L-Omp19. These results, together with our previous observations establish that B. abortus utilizes its lipoproteins to inhibit the monocytes/macrophages activation mediated by IFN-γ and to subvert host immunonological responses.
journal_name
Microbes Infectjournal_title
Microbes and infectionauthors
Barrionuevo P,Delpino MV,Velásquez LN,García Samartino C,Coria LM,Ibañez AE,Rodríguez ME,Cassataro J,Giambartolomei GHdoi
10.1016/j.micinf.2010.10.020subject
Has Abstractpub_date
2011-03-01 00:00:00pages
239-50issue
3eissn
1286-4579issn
1769-714Xpii
S1286-4579(10)00279-0journal_volume
13pub_type
杂志文章abstract：:Novel vaccines are needed to control tuberculosis (TB), the bacterial infectious disease that together with malaria and HIV is worldwide responsible for high levels of morbidity and mortality. TB can result from the reactivation of an initially controlled latent infection by Mycobacterium tuberculosis (Mtb). Mtb prote...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2011.08.011
更新日期：2012-01-01 00:00:00
abstract：:Respiratory syncytial virus (RSV) infection causes severe lower respiratory diseases in infancy, early childhood and the elderly. RSV infections respond poorly to current therapies. Therefore, we initiated a search for novel drug targets by investigating the characteristics and identity of RSV adhesion receptors on ma...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/s1286-4579(02)00079-5
更新日期：2003-02-01 00:00:00
abstract：:The bacteria-phagocyte interaction is of central importance in Salmonella pathogenesis. Immediately following phagocytosis, the NADPH phagocyte oxidase complex assembles in vesicles and produces highly toxic reactive oxygen species that play a major role in initial Salmonella killing by phagocytes. However, Salmonella...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(01)01492-7
更新日期：2001-11-01 00:00:00
abstract：:Conventional cell lines are commonly used to study infection characteristics of the human gastric pathogen Helicobacter pylori. We sought to investigate bacterial attachment to human antral primary epithelial cells, a cell model that more closely resembles the human stomach than transformed cell lines. Primary cells w...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/s1286-4579(00)01322-8
更新日期：2000-11-01 00:00:00
abstract：:During the endocytic uptake of particulate material such as microorganisms, the transition from the engulfment step to the internalization step of phagocytosis may be disturbed. Thus, the pseudopods flanking the particles do not close to a phagosome, but lie on top of each other. This uncoupling of pseudopod extension...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(99)80074-4
更新日期：1999-07-01 00:00:00
abstract：:Infectious diseases are major causes, with malignancies, of morbidity and mortality in the elderly. Increased susceptibility to infections may result from underlying dysfunction of an aged immune system; moreover, inappropriate immunologic functions associated with aging can determine an insufficient response to vacci...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(01)01443-5
更新日期：2001-08-01 00:00:00
abstract：:The rpoB gene encoding the beta subunit of the DNA-dependent RNA polymerase was molecularly characterized by PCR amplification and DNA sequencing in 26 Brucella reference strains by using primers selected according to the B. melitensis 16 M rpoB published sequence. Comparison of the rpoB nucleotide sequence of all Bru...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2005.10.008
更新日期：2006-03-01 00:00:00
abstract：:The bacterium Haemophilus ducreyi causes the sexually transmitted disease chancroid, which is characterized by the appearance of mucocutaneous, persistent ulcers on the external genitals. To identify carbohydrate receptors that mediate the attachment of this pathogen to host cells, we investigated the binding of 35S-m...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2006.05.009
更新日期：2006-08-01 00:00:00
abstract：:miRNAs are small noncoding RNA that play a crucial role in gene regulation by inhibiting translation or promoting mRNA degradation. Viruses themselves express miRNAs that can target either the host or viral mRNA transcriptome. Moreover, viral infection of cells causes a drastic change in host miRNAs. This complex inte...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2017.12.007
更新日期：2018-01-01 00:00:00
abstract：:Dengue fever and dengue hemorrhagic fever are important diseases worldwide. Although antibody-dependent enhancement of infection has been proposed as a mechanism for increased disease severity, enhancing antibodies in endemic people have not been thoroughly investigated. Recently, we established a serological assay sy...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2012.07.013
更新日期：2012-11-01 00:00:00
abstract：:A robust and reliable cell culture system for serum-derived HCV (HCVser) has not been established yet because of the presence of neutralizing antibody and tropism for infection. To overcome this obstacle, we employed a lipid-mediated protein intracellular delivery reagent (PIDR) that permits internalization of protein...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2011.01.005
更新日期：2011-04-01 00:00:00
abstract：:Salmonella, a Gram-negative facultative intracellular pathogen is capable of infecting vast array of hosts. The striking ability of Salmonella to overcome every hurdle encountered in the host proves that they are true survivors. In the host, Salmonella infects various cell types and needs to survive and replicate by c...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2010.05.010
更新日期：2010-10-01 00:00:00
abstract：:Helicobacter pylori activates extracellular-signal related (ERK) kinases in gastric epithelial cells, via transactivation of the EGF receptor (EGFR). H. pylori activation of EGFR may be relevant to epithelial hyperproliferation and gastric carcinogenesis. The aim of this study was to develop an 'In-Cell Western' (ICW)...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2007.03.004
更新日期：2007-06-01 00:00:00
abstract：:Enterovirus 71 (EV71) is a neurotropic pathogen that can cause severe neural diseases and complications on infected patients. Clinical observations showed that EV71-induced immune responses may be associated with virus induced neurogenic pulmonary edema. Here reviewed studies that discovered several host molecules as ...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2010.03.006
更新日期：2010-07-01 00:00:00
abstract：:Population genetic structure and subdivision are key factors affecting the evolution of organisms. In this study, we analysed and compared the population genetic structure of the malaria parasite Plasmodium falciparum and its mosquito vector Anopheles gambiae over space and time in the Nianza Province, near Victoria L...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2007.12.021
更新日期：2008-03-01 00:00:00
abstract：:The immune response, both in innate and adaptive immunity, is controlled at several levels, including signaling from the central nervous system. Neuropeptides released within the lymphoid organs modulate the immune response, either as stimulators or inhibitors. The subject of this review is the description of macropha...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(00)01361-7
更新日期：2001-02-01 00:00:00
abstract：:The filoviruses, Ebola and Marburg, are two of the most pathogenic viruses, causing lethal hemorrhagic fever in humans. Recent discoveries suggest that filoviruses, along with other phylogenetically or functionally related viruses, utilize a complex mechanism of replication exploiting multiple cellular components incl...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(03)00095-9
更新日期：2003-06-01 00:00:00
abstract：:Toll-like receptors recognize specific patterns of microbial components and regulate the activation of both innate and adaptive immunity. TLR4 recognizes lipopolysaccharide (LPS) in monocytes/macrophages with the help of other molecules like CD14 and MD-2, which indicates that the functional LPS receptor forms a large...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2004.05.010
更新日期：2004-09-01 00:00:00
abstract：:This review summarizes and discusses virulence mechanisms whereby Porphyromonas gingivalis can persist in the oral cavity. It is proposed that the virulence of P. gingivalis is dependent, at least in part, upon its ability to establish a complex host-pathogen molecular crosstalk which subverts innate immunity. The sop...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2009.03.009
更新日期：2009-05-01 00:00:00
abstract：:Although the pathogenesis of periodontal disease (PD) is not well known, cytokines, chemotactic factors and inflammatory cells are certainly involved in the disease outcome. Here, we characterized the evolution of the PD induced by Actinobacillus actinomycetemcomitans in mice, showing that oral inoculation of these ba...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2005.01.012
更新日期：2005-04-01 00:00:00
abstract：:Very recently, a new avian flu outbreak in humans, which is caused by a novel H7N9 influenza A virus (AIV), was reported in China. As of April 13, 2013, 49 confirmed cases (mainly middle-aged to elderly males), including 11 deaths, were reported in China. Here we analyzed the genomic signatures and protein sequences o...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2013.04.004
更新日期：2013-06-01 00:00:00
abstract：:Borna disease virus (BDV) is a noncytolytic, neurotropic RNA virus that causes neurobehavioral disorders in a wide variety of warm-blooded animals. Recent evidence has revealed that BDV uses a unique strategy in its transcription and replication and directly affects cellular functions of infected central nervous syste...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(02)01564-2
更新日期：2002-04-01 00:00:00
abstract：:Down syndrome (DS) is the most common chromosomal abnormality among live-born infants. Respiratory tract infections are the most important cause of mortality in individuals with DS at all ages. In recent decades several studies have been performed to elucidate abnormalities of the immune system in DS. However, the inf...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2010.05.007
更新日期：2010-10-01 00:00:00
abstract：:Twenty years ago we reported the first synthetic peptide-based anti-malarial vaccine named SPf66, which conferred limited protective efficacy in large-scale human field-trials. Our efforts towards a second vaccine generation based on the rational selection of conserved high activity binding peptides (HABPs) whose crit...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2007.02.004
更新日期：2007-05-01 00:00:00
abstract：:The intestine is inhabited by a diverse range of microorganisms, which requires the host to employ numerous barrier measures to prevent bacterial invasion. However, the intestinal microbiota additionally acts symbiotically with host cells to maintain epithelial barrier function, and perturbation to this interaction pl...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2020.10.009
更新日期：2020-11-12 00:00:00
abstract：:The occurrence of Bacillus thuringiensis bacteremia in a neutropenic patient suffering from severe pulmonary disease addressed the question of whether the aggressive behavior of B. thuringiensis depended on the host status and/or on the membrane-damaging toxins the isolate produced. After intratracheal injection, BALB...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2007.02.001
更新日期：2007-04-01 00:00:00
abstract：:Black rats (Rattus rattus) receiving Leishmania tropica injected intradermally into the ear were studied for the persistence of parasites and infectivity to natural sand fly vector. The mammalian host, the parasite, and the vector all originated from the endemic focus of Urfa, Turkey. Rats did not develop lesions or a...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/s1286-4579(03)00046-7
更新日期：2003-04-01 00:00:00
abstract：:Research into intracellular sensing of microbial products is an up and coming field in innate immunity. Nod1 and Nod2 are members of the rapidly expanding family of NACHT domain-containing proteins involved in intracellular recognition of bacterial products. Nods proteins are involved in the cytosolic detection of pep...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/j.micinf.2007.01.014
更新日期：2007-04-01 00:00:00
abstract：:This short review will highlight three areas of current research on the role of complement in bacterial infection. These are i) the use of mice with targeted disruption of complement genes to study infectious disease models; ii) studies on the interactions between bacterial virulence factors and complement regulatory ...
journal_title：Microbes and infection
pub_type： 杂志文章,评审
doi：10.1016/s1286-4579(99)80063-x
更新日期：1999-07-01 00:00:00
abstract：:Translocation of normally non-pathogenic bacteria across the gut may drive inflammatory responses associated with sepsis and inflammatory bowel disease. Recent evidence suggests translocation may not be purely passive, but occurs via novel transcellular pathways activated in enterocytes by inflammatory and metabolic s...
journal_title：Microbes and infection
pub_type： 杂志文章
doi：10.1016/j.micinf.2008.01.001
更新日期：2008-04-01 00:00:00
