Abstract:
:Staphylococcus aureus is a human pathogen responsible for high morbidity and mortality worldwide. Recurrent infections with this bacterium are common, suggesting that S. aureus thwarts the development of sterilizing immunity. S. aureus strains that cause disease in humans produce up to five different bicomponent toxins (leukocidins) that target and lyse neutrophils, innate immune cells that represent the first line of defense against S. aureus infections. However, little is known about the role of leukocidins in blunting adaptive immunity. Here, we explored the effects of leukocidins on human dendritic cells (DCs), antigen-presenting cells required for the development of adaptive immunity. Using an ex vivo infection model of primary human monocyte-derived dendritic cells, we found that S. aureus, including strains from different clonal complexes and drug resistance profiles, effectively kills DCs despite efficient phagocytosis. Although all purified leukocidins could kill DCs, infections with live bacteria revealed that S. aureus targets and kills DCs primarily via the activity of leukocidin LukAB. Moreover, using coculture experiments performed with DCs and autologous CD4+ T lymphocytes, we found that LukAB inhibits DC-mediated activation and proliferation of primary human T cells. Taken together, the data determined in the study reveal a novel immunosuppressive strategy of S. aureus whereby the bacterium blunts the development of adaptive immunity via LukAB-mediated injury of DCs.IMPORTANCE Antigen-presenting cells such as dendritic cells (DCs) fulfill an indispensable role in the development of adaptive immunity by producing proinflammatory cytokines and presenting microbial antigens to lymphocytes to trigger a faster, specific, and long-lasting immune response. Here, we studied the effect of Staphylococcus aureus toxins on human DCs. We discovered that the leukocidin LukAB hinders the development of adaptive immunity by targeting human DCs. The ability of S. aureus to blunt the function of DCs could help explain the high frequency of recurrent S. aureus infections. Taken together, the results from this study suggest that therapeutically targeting the S. aureus leukocidins may boost effective innate and adaptive immune responses by protecting innate leukocytes, enabling proper antigen presentation and T cell activation.
journal_name
mBiojournal_title
mBioauthors
Berends ETM,Zheng X,Zwack EE,Ménager MM,Cammer M,Shopsin B,Torres VJdoi
10.1128/mBio.01918-18subject
Has Abstractpub_date
2019-01-02 00:00:00issue
1issn
2150-7511pii
mBio.01918-18journal_volume
10pub_type
杂志文章相关文献
mBio文献大全abstract:UNLABELLED:Moraxella catarrhalis is a human respiratory pathogen that causes acute otitis media in children and is associated with exacerbations in patients suffering from chronic obstructive pulmonary disease (COPD). The first step in M. catarrhalis colonization is adherence to the mucosa, epithelial cells, and extrac...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00066-16
更新日期:2016-03-22 00:00:00
abstract::Herpesvirus latency has been difficult to understand molecularly due to low levels of viral genomes and gene expression. In the case of the betaherpesvirus human cytomegalovirus (HCMV), this is further complicated by the heterogeneity inherent to hematopoietic subpopulations harboring genomes and, as a consequence, th...
journal_title:mBio
pub_type: 评论,杂志文章
doi:10.1128/mBio.01001-18
更新日期:2018-06-12 00:00:00
abstract:UNLABELLED:While research has identified an important contribution for metals, such as iron, in microbial pathogenesis, the roles of other transition metals, such as copper, remain mostly unknown. Recent evidence points to a requirement for copper homeostasis in the virulence of Cryptococcus neoformans based on a role ...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00285-12
更新日期:2012-10-02 00:00:00
abstract::Since the discovery of symbioses between sulfur-oxidizing (thiotrophic) bacteria and invertebrates at hydrothermal vents over 40 years ago, it has been assumed that autotrophic fixation of CO2 by the symbionts drives these nutritional associations. In this study, we investigated "Candidatus Kentron," the clade of symb...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01112-19
更新日期:2019-06-25 00:00:00
abstract::The alarmone (p)ppGpp plays pivotal roles in basic bacterial stress responses by increasing tolerance of various nutritional limitations and chemical insults, including antibiotics. Despite intensive studies since (p)ppGpp was discovered over 4 decades ago, (p)ppGpp binding proteins have not been systematically identi...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.02188-17
更新日期:2018-03-06 00:00:00
abstract::The blast fungus initiates infection using a heavily melanized, dome-shaped infection structure known as the appressorium, which forcibly ruptures the cuticle to enter the rice leaf tissue. How this process takes place remains not fully understood. Here, we used untargeted metabolomics analyses to profile the metabolo...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01467-19
更新日期:2019-08-20 00:00:00
abstract:UNLABELLED:In the context of deciphering the metabolic strategies of the obligate pathogenic fungi in the genus Pneumocystis, the genomes of three species (P. carinii, P. murina, and P. jirovecii) were compared among themselves and with the free-living, phylogenetically related fission yeast (Schizosaccharomyces pombe)...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01834-14
更新日期:2014-11-04 00:00:00
abstract::Photoferrotrophy is a form of anoxygenic photosynthesis whereby bacteria utilize soluble or insoluble forms of ferrous iron as an electron donor to fix carbon dioxide using light energy. They can also use poised electrodes as their electron donor via phototrophic extracellular electron uptake (phototrophic EEU). The e...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.02668-19
更新日期:2019-11-05 00:00:00
abstract:UNLABELLED:Particular types of hormonal contraceptives (HCs) and genital tract infections have been independently associated with risk of HIV-1 acquisition. We examined whether immunity in women using injectable depot medroxyprogesterone acetate (DMPA), combined oral contraceptives (COC), or no HCs differs by the prese...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00221-15
更新日期:2015-09-01 00:00:00
abstract::Simian virus 40 (SV40) is a nonenveloped DNA virus that traffics through the endoplasmic reticulum (ER) en route to the nucleus, but the mechanisms of capsid disassembly and ER exit are poorly understood. We conducted an unbiased RNA interference screen to identify cellular genes required for SV40 infection. SV40 infe...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00101-11
更新日期:2011-06-14 00:00:00
abstract::Microbial establishment within the gastrointestinal (GI) tract requires surveillance of the gut biogeography. The gut microbiota coordinates behaviors by sensing host- or microbiota-derived signals. Here we show for the first time that microbiota-derived indole is highly prevalent in the lumen compared to the intestin...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01031-19
更新日期:2019-06-04 00:00:00
abstract::Colicins are toxins produced and released by Enterobacteriaceae to kill competitors in the gut. While group A colicins employ a division of labor strategy to liberate the toxin into the environment via colicin-specific lysis, group B colicin systems lack cognate lysis genes. In Salmonella enterica serovar Typhimurium ...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00912-20
更新日期:2020-07-21 00:00:00
abstract::The pharmacopeia used by physicians and laypeople in medieval Europe has largely been dismissed as placebo or superstition. While we now recognize that some of the materia medica used by medieval physicians could have had useful biological properties, research in this area is limited by the labor-intensive process of ...
journal_title:mBio
pub_type: 历史文章,杂志文章
doi:10.1128/mBio.03136-19
更新日期:2020-02-11 00:00:00
abstract::The major oxidative stress response in Streptomyces is controlled by the sigma factor SigR and its cognate antisigma factor RsrA, and SigR activity is tightly controlled through multiple mechanisms at both the transcriptional and posttranslational levels. Here we show that sigR has a highly unusual GTC start codon and...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00815-17
更新日期:2017-06-13 00:00:00
abstract::The resurgence of pertussis (whooping cough) in countries with high vaccination coverage is alarming and invites reconsideration of the use of current acellular pertussis (aP) vaccines, which have largely replaced the old, reactogenic, whole-cell pertussis (wP) vaccine. Some drawbacks of these vaccines in terms of lim...
journal_title:mBio
pub_type: 社论
doi:10.1128/mBio.01339-14
更新日期:2014-06-10 00:00:00
abstract::Pseudomonas aeruginosa produces an extracellular biofilm matrix that consists of nucleic acids, exopolysaccharides, lipid vesicles, and proteins. In general, the protein component of the biofilm matrix is poorly defined and understudied relative to the other major matrix constituents. While matrix proteins have been s...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00543-18
更新日期:2018-04-10 00:00:00
abstract::1-Butanol is a large-volume, intermediate chemical with favorable physical and chemical properties for blending with or directly substituting for gasoline. The per-volume value of butanol, as a chemical, is sufficient for investing into the recommercialization of the classical acetone-butanol-ethanol (ABE) (E. M. Gree...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00518-12
更新日期:2012-12-11 00:00:00
abstract:UNLABELLED:Fast, definitive diagnosis of Creutzfeldt-Jakob disease (CJD) is important in assessing patient care options and transmission risks. Real-time quaking-induced conversion (RT-QuIC) assays of cerebrospinal fluid (CSF) and nasal-brushing specimens are valuable in distinguishing CJD from non-CJD conditions but h...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.02451-14
更新日期:2015-01-20 00:00:00
abstract::UDP-N-acetylglucosamine (UDP-GlcNAc), the main product of the hexosamine biosynthetic pathway, is an important metabolite in protozoan parasites since its sugar moiety is incorporated into glycosylphosphatidylinositol (GPI) glycolipids and N- and O-linked glycans. Apicomplexan parasites have a hexosamine pathway compa...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.02045-20
更新日期:2020-10-20 00:00:00
abstract:UNLABELLED:Methicillin-resistant Staphylococcus aureus (MRSA) strains are leading causes of hospital-acquired infections in the United States, and clonal cluster 5 (CC5) is the predominant lineage responsible for these infections. Since 2002, there have been 12 cases of vancomycin-resistant S. aureus (VRSA) infection i...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00112-12
更新日期:2012-05-22 00:00:00
abstract:UNLABELLED:The promoter most strongly induced upon activation of the Cpx two-component envelope stress response is the cpxP promoter. The 3' untranscribed region (UTR) of the cpxP transcript is shown to produce a small RNA (sRNA), CpxQ. We investigated the role of CpxQ in combating envelope stress. Remarkably, the two ...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00312-16
更新日期:2016-04-05 00:00:00
abstract::Estrogen, a major female sex steroid hormone, has been shown to promote the selection of mucoid Pseudomonas aeruginosa in the airways of patients with chronic respiratory diseases, including cystic fibrosis. This results in long-term persistence, poorer clinical outcomes, and limited therapeutic options. In this study...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01774-20
更新日期:2020-09-29 00:00:00
abstract::The mammalian gut contains a complex assembly of commensal microbes termed microbiota. Although much has been learned about the role of these microbes in health, the mechanisms underlying these functions are ill defined. We have recently shown that the mammalian gut contains thousands of small molecules, most of which...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01183-14
更新日期:2014-07-29 00:00:00
abstract::Protein ubiquitylation regulates not only endocellular trafficking and proteasomal degradation but also the catalytic activity of enzymes. In Saccharomyces cerevisiae, we analyzed the composition of the ubiquitylated proteomes in strains lacking acetyltransferase Gcn5p, Ub-protease Ubp8p, or both to understand their i...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.01504-20
更新日期:2020-08-11 00:00:00
abstract::The hospital environment is a potential reservoir of bacteria with plasmids conferring carbapenem resistance. Our Hospital Epidemiology Service routinely performs extensive sampling of high-touch surfaces, sinks, and other locations in the hospital. Over a 2-year period, additional sampling was conducted at a broader ...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.02011-17
更新日期:2018-02-06 00:00:00
abstract::The pathogenic species of Cryptococcus are a major cause of mortality owing to severe infections in immunocompromised as well as immunocompetent individuals. Although antifungal treatment is usually effective, many patients relapse after treatment, and in such cases, comparative analyses of the genomes of incident and...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00166-17
更新日期:2017-03-07 00:00:00
abstract::Bacteroides thetaiotaomicron is one of the most abundant gut symbiont species, whose contribution to host health through its ability to degrade dietary polysaccharides and mature the immune system is under intense scrutiny. In contrast, adhesion and biofilm formation, which are potentially involved in gut colonization...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00729-20
更新日期:2020-06-23 00:00:00
abstract:UNLABELLED:The intracellular parasite Toxoplasma gondii infects a wide variety of vertebrate species globally. Infection in most hosts causes a lifelong chronic infection and generates immunological memory responses that protect the host against new infections. In regions where the organism is endemic, multiple exposur...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.02280-14
更新日期:2015-02-24 00:00:00
abstract::The human malaria parasite Plasmodium falciparum replicates within circulating red blood cells, where it is subjected to conditions that frequently cause DNA damage. The repair of DNA double-stranded breaks (DSBs) is thought to rely almost exclusively on homologous recombination (HR), due to a lack of efficient nonhom...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00547-17
更新日期:2017-08-08 00:00:00
abstract::Enterococci are important human commensals and significant opportunistic pathogens. Biofilm-related enterococcal infections, such as endocarditis, urinary tract infections, wound and surgical site infections, and medical device-associated infections, often become chronic upon the formation of biofilm. The biofilm matr...
journal_title:mBio
pub_type: 杂志文章
doi:10.1128/mBio.00626-17
更新日期:2018-04-10 00:00:00