Abstract:
:We investigated the ability of using monoclonal antibodies (MAbs) against anthrax protective antigen (PA), an anthrax exotoxin component, to modulate exotoxin cytotoxic activity on target macrophage cell lines. Anthrax PA plays a critical role in the pathogenesis of Bacillus anthracis infection. PA is the cell-binding component of the two anthrax exotoxins: lethal toxin (LeTx) and edema toxin. Several MAbs that bind the PA component of LeTx are known to neutralize LeTx-mediated killing of target macrophages. Here we describe for the first time an overlooked population of anti-PA MAbs that, in contrast, function to increase the potency of LeTx against murine macrophage cell lines. The results support a possible mechanism of enhancement: binding of MAb to PA on the macrophage cell surface stabilizes the PA by interaction of MAb with macrophage Fcgamma receptors. This results in an increase in the amount of PA bound to the cell surface, which in turn leads to an enhancement in cell killing, most likely due to increased internalization of LF. Blocking of PA-receptor binding eliminates enhancement by MAb, demonstrating the importance of this step for the observed enhancement. The additional significance of these results is that, at least in mice, immunization with PA appears to elicit a poly-clonal response that has a significant prevalence of MAbs that enhance LeTx-mediated killing in macrophages.
journal_name
Infect Immunjournal_title
Infection and immunityauthors
Mohamed N,Li J,Ferreira CS,Little SF,Friedlander AM,Spitalny GL,Casey LSdoi
10.1128/IAI.72.6.3276-3283.2004keywords:
subject
Has Abstractpub_date
2004-06-01 00:00:00pages
3276-83issue
6eissn
0019-9567issn
1098-5522pii
72/6/3276journal_volume
72pub_type
杂志文章abstract::Numerous studies have reported that asialo-GM(1), gangliotetraosylceramide, or moieties serve as epithelial cell receptors for Pseudomonas aeruginosa. Usually this interaction is confirmed with antibodies to asialo-GM(1). However, few, if any, of these reports have evaluated the binding of fresh clinical isolates of P...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.69.2.719-729.2001
更新日期:2001-02-01 00:00:00
abstract::The kinetics of Bacillus anthracis toxin production in culture and its lethal activity in rats, mice, and guinea pigs were investigated. Lethal toxin activity was produced in vitro throughout exponential growth at essentially identical rates in both encapsulated virulent and nonencapsulated avirulent strains. The two ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.45.3.761-767.1984
更新日期:1984-09-01 00:00:00
abstract::Susceptibility to the lethal toxicity of endotoxin in mice pretreated with emulsified trehalose-6,6'-dimycolate was enhanced by (i) increasing the oil concentration while keeping the Tween concentration constant; and (ii) decreasing the Tween concentration, while keeping the oil concentration constant. ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.24.2.571-572.1979
更新日期:1979-05-01 00:00:00
abstract::Monoclonal antibodies were raised against a bactericidal protein fraction that was purified from an extract of bovine neutrophil granules and that was previously shown (A. Savoini, R. Marzari, L. Dolzani, D. Serranò, G. Graziosi, R. Gennaro, and D. Romeo, Antimicrob. Agents Chemother. 26:405-407, 1984) to inhibit bact...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.56.8.2193-2197.1988
更新日期:1988-08-01 00:00:00
abstract::Optimal protective immunity against babesial infection is postulated to require both complement-fixing and opsonizing antibodies in addition to gamma interferon (IFN-gamma)-mediated macrophage activation. The rhoptry-associated protein 1 (RAP-1) of Babesia bigemina induces partial protective immunity and is a candidat...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.67.1.155-164.1999
更新日期:1999-01-01 00:00:00
abstract::Cholera enterotoxin and the related heat-labile enterotoxins of Escherichia coli enter their target cells through noncoated vesicles, but how the toxins are processed intracellularly and how they get to their targeted enzyme, adenylate cyclase, remain to be defined. Brefeldin A, an inhibitor of the trans-Golgi network...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.61.8.3282-3286.1993
更新日期:1993-08-01 00:00:00
abstract::The development of a vaccine is essential for the elimination of malaria. However, despite many years of effort, a successful vaccine has not been achieved. Most subunit vaccine candidates tested in clinical trials have provided limited efficacy, and thus attenuated whole-parasite vaccines are now receiving close scru...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.00157-16
更新日期:2016-07-21 00:00:00
abstract::Subtilase cytotoxin (SubAB) was first isolated from a Shiga toxigenic Escherichia coli (STEC) strain that was responsible for an outbreak of hemolytic-uremic syndrome and is the prototype of a new family of AB(5) cytotoxins. SubAB is a subtilase-like serine protease, and upon uptake by host cells, it is trafficked to ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.00801-10
更新日期:2010-11-01 00:00:00
abstract::Previous studies showed that Pseudomonas aeruginosa exotoxin A (PA toxin) catalyzes nicotinamide adenine dinucleotide (NAD)-dependent inhibition of protein synthesis in a rabbit reticulocyte lysate and transfer of radioactivity from [14C]adenine-labeled NAD to a protein having the same molecular weight as elongation f...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.15.1.138-144.1977
更新日期:1977-01-01 00:00:00
abstract::The role of the hypothalamus-pituitary-adrenal (HPA) axis in regulating the growth of Mycobacterium avium in Mycobacterium bovis BCG-resistant and -susceptible congenic mice was evaluated. Restraint was used to activate the HPA axis, which resulted in an increase in the level of corticosterone in the plasma. Activatio...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.61.11.4793-4800.1993
更新日期:1993-11-01 00:00:00
abstract::Human gamma delta T cells are known to respond at high frequencies to pathogenic mycobacteria. Here we show that opportunistic strains of mycobacteria share with pathogenic mycobacteria the ability to trigger at high frequencies human V gamma 9V delta 2 T-cell-receptor-positive T lymphocytes. Stimulating ligands were ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.60.7.2753-2757.1992
更新日期:1992-07-01 00:00:00
abstract::Yersinia pestis KIM5 was found to be cytotoxic for the IC21 and P388D1 mouse macrophage cell lines, as well as for resident peritoneal macrophages from C57BL/6 mice. Affected cells phagocytosed KIM5 inefficiently, became spherical, detached readily from culture dishes, and retained 51Cr poorly. The cytotoxic effect wa...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.51.3.788-794.1986
更新日期:1986-03-01 00:00:00
abstract::Poly-N-acetyl-glucosamine (PNAG) is a staphylococcal surface polysaccharide influencing biofilm formation that is also under investigation for its vaccine potential. Antibodies that bind to PNAG with either low (<15%) or high (>90%) levels of acetate are superior at opsonic and protective activity compared with antibo...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.00078-07
更新日期:2007-07-01 00:00:00
abstract::When inoculated orally, Escherichia coli strain 1056 caused acute enteritis in 7 of 22 weanling hamsters. E. coli strain 1056 was isolated from the ileum of a hamster with proliferative ileitis. It was lactose negative, nonmotile, and anaerogenic. By electron microscopy and indirect fluorescent-antibody techniques, E....
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.31.3.1232-1238.1981
更新日期:1981-03-01 00:00:00
abstract::We recently determined that passive transfer of serum directed against a synthetic peptide called LB1 or a recombinant fusion protein immunogen [LPD-LB1(f)(2,1,3)] could prevent otitis media after challenge with a homologous nontypeable Haemophilus influenzae (NTHI) isolate. NTHI residing in the nasopharynx was rapidl...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.68.5.2756-2765.2000
更新日期:2000-05-01 00:00:00
abstract::Group A streptococcal cell walls inhibited phagocytosis of polystyrene latex particles by rat peritoneal macrophages in vitro. This inhibition was not accompanied by a measurable loss of cell viability. Group D streptococcal cell walls were relatively ineffective in altering phagocytosis. The effectiveness of group A ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.20.1.258-261.1978
更新日期:1978-04-01 00:00:00
abstract::This study determined the role of crl in the production of curli by, the hemagglutination activity of, and fibronectin binding by avian pathogenic Escherichia coli chi 7122. Curli, an extracellular structure that binds fibronectin, was recently described (A. Olsén, A. Jonsson, and S. Normark, Nature [London] 338:652-6...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.60.11.4460-4467.1992
更新日期:1992-11-01 00:00:00
abstract::We examined 205 enterotoxigenic strains of Escherichia coli for colonization factor antigens (CFA) I and II, using an immunodiffusion technique with specific antisera. A total of 36 strains of serogroups O63, O78, O114, O128, and O153 and 1 rough strain possessed CFA/I and gave a single precipitin line; 47 strains of ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.36.1.189-197.1982
更新日期:1982-04-01 00:00:00
abstract::Tuberculosis remains a leading killer worldwide, and new approaches for its treatment and prevention are urgently needed. This effort will benefit greatly from a better understanding of gene regulation in Mycobacterium tuberculosis, particularly with respect to this pathogen's response to its host environment. We exam...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.70.3.1518-1529.2002
更新日期:2002-03-01 00:00:00
abstract::In an Escherichia coli strain of human origin, ampicillin resistance and heat-stable enterotoxin activity were shown by EcoRI restriction endonuclease and genetic analysis to be in an 80-megadalton plasmid. ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:
更新日期:1980-11-01 00:00:00
abstract::Streptococcus mutans produces several enzymes which metabolize sucrose. Three glucosyltransferase genes (gtfB, gtfC, and gtfD) and a single fructosyltransferase gene (ftf) encode enzymes which are important in formation of exopolysaccharides. Mutants of S. mutans V403 carrying single and multiple mutations of the gtfB...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.59.7.2316-2323.1991
更新日期:1991-07-01 00:00:00
abstract::The purpose of our study was to characterize the properties of the interaction of pertussis toxin with human polymorphonuclear leukocytes for the modulation of leukotriene generation and metabolism. The cells were stimulated with either the Ca ionophore A23187, opsonized zymosan, or the bacterial peptide formyl-methio...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.57.10.3165-3171.1989
更新日期:1989-10-01 00:00:00
abstract::Two Escherichia coli strains (B/M 369 and C-35) belonging to enteropathogenic serogroup O86 were isolated from patients with infantile diarrhea and studied with respect to their cellular adherence properties. Both strains exhibited adherence (Ad+) to HEp-2 and HeLa cell monolayers in vitro and expressed mannose-resist...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.58.4.1106-1113.1990
更新日期:1990-04-01 00:00:00
abstract::Modification of three or four of the five histidine residues in the toxic shock syndrome toxin 1 (TSST-1) with diethylpyrocarbonate did not inhibit the precipitin reaction of the modified TSST-1 with polyvalent antisera to the toxin. Monoclonal antibody 7T did not react with the modified TSST-1, but monoclonal antibod...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.57.7.1901-1905.1989
更新日期:1989-07-01 00:00:00
abstract::Two distinct types of granulomas were produced in the draining lymph nodes by immunizing guinea pigs with Mycobacterium bovis BCG or Mycobacterium leprae, as reported earlier (Narayanan et al., J. Pathol. 134:253-265, 1981). In the BCG-induced granuloma there is successful containment, killing, and degradation of the ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.39.1.344-352.1983
更新日期:1983-01-01 00:00:00
abstract::While several diseases associated with Chlamydia psittaci infection have been reported in Phascolarctos cinereus (koala), it is still unclear whether one or more chlamydial strains are responsible. In this study, we provide evidence, obtained by restriction enzyme and gene probe analysis, that two quite distinct strai...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.56.8.1897-1900.1988
更新日期:1988-08-01 00:00:00
abstract::Protective immunity against pulmonary tuberculosis (TB) is characterized by the formation in the lungs of granulomas consisting of macrophages and activated T cells producing tumor necrosis factor alpha and gamma interferon, both required for the activation of the phagocytes. In 90% of immunocompetent humans, this res...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.71.12.7099-7108.2003
更新日期:2003-12-01 00:00:00
abstract::Bacteroides fragilis with enterotoxin-like activity (BFEL) was isolated from the feces of 24- to 48-h-old lambs with acute diarrheal disease on three different sheep ranches in the Northern Rocky Mountain region of the United States. The lamb intestinal loop test was used to enrich for the bacterium before its initial...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.44.2.241-244.1984
更新日期:1984-05-01 00:00:00
abstract::[1-(14)C]acetate is incorporated into lipids more rapidly by liver from Aeromonas salmonicida-infected trout than by normal trout liver, both in vitro and in vivo. The increase was, in general, about twofold to less than threefold. ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.14.3.836-838.1976
更新日期:1976-09-01 00:00:00
abstract::Porphyromonas gingivalis is a major etiologic agent of periodontitis, a chronic inflammatory disease that ultimately results in the loss of the supporting tissues of the teeth. Previous work has demonstrated the usefulness of avirulent Salmonella enterica serovar Typhimurium strains as antigen delivery systems for pro...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.68.2.732-739.2000
更新日期:2000-02-01 00:00:00