Abstract:
:Chronic helminth infections are known to be associated with the modulation of antigen-specific T-cell responses. Strongyloides stercoralis infection is characterized by the downmodulation of antigen-specific Th1 and Th17 responses and the upregulation of Th2 and Th9 responses. Immune homeostasis is partially maintained by negative regulators of T-cell activation, cytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) and programmed death 1 (PD-1), which dampen effector responses during chronic infections. However, their roles in S. stercoralis infection are yet to be defined. Therefore, we sought to determine the role of CTLA-4 and PD-1 in regulating CD4+ and CD8+ T-cell responses and examined the frequencies of monofunctional and dual functional Th1/T cytotoxic type 1 (Tc1), Th17/Tc17, Th2/Tc2, and Th9/Tc9 cells in S. stercoralis infection in 15 infected individuals stimulated with parasite antigen following CTLA-4 or PD-1 blockade. Our data reveal that CTLA-4 or PD-1 blockade results in significantly enhanced frequencies of monofunctional and dual functional Th1/Tc1 and Th17/Tc17 cells and, in contrast, diminishes the frequencies of monofunctional and dual functional Th2/Tc2 and Th9/Tc9 cells with parasite antigen stimulation in whole-blood cultures. Thus, we demonstrate that CTLA-4 and PD-1 limit the induction of particular T-cell subsets in S. stercoralis infection, which suggests the importance of CTLA-4 and PD-1 in immune modulation in a chronic helminth infection.
journal_name
Infect Immunjournal_title
Infection and immunityauthors
Rajamanickam A,Munisankar S,Dolla C,Nutman TB,Babu Sdoi
10.1128/IAI.00469-19subject
Has Abstractpub_date
2019-11-18 00:00:00issue
12eissn
0019-9567issn
1098-5522pii
IAI.00469-19journal_volume
87pub_type
杂志文章abstract::Toxic shock syndrome (TSS) toxin 1 (TSST1) is produced by strains of Staphylococcus aureus associated with TSS. Purified TSST1 induces in rabbits a shock-like illness with many features similar to TSS in humans. These symptoms were also induced by TSST1-producing bacteria in diffusion chambers implanted in the rabbit ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.50.1.304-309.1985
更新日期:1985-10-01 00:00:00
abstract::The type III secretion system (T3SS) of pathogenic bordetellae employs a self-associating tip complex protein Bsp22. This protein is immunogenic during infections by Bordetella bronchiseptica and could be used as a protective antigen to immunize mice against B. bronchiseptica challenge. Since low-passage clinical isol...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.00353-13
更新日期:2013-08-01 00:00:00
abstract::The need for agents designed to modify immune response in the treatment of patients with viral infection, immunodeficiency, or cancer prompted the present study on the mechanisms of action of isoprinosine, a compound developed for antiviral use and whose therapeutic activity may involve the immune system. The effect o...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.13.2.382-387.1976
更新日期:1976-02-01 00:00:00
abstract::In the present study, the immunodepressive effects of canine distemper virus (CDV) infection of dogs on two parameters of lymphocyte function, namely phytomitogen-induced cellular proliferation and skin allograft rejection, were investigated. Infection of susceptible gnotobiotic dogs with virulent R252-CDV resulted in...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.11.5.1069-1078.1975
更新日期:1975-05-01 00:00:00
abstract::We investigated the cytokine/chemokine secretions and alteration of protein expression from peripheral blood mononuclear cells (PBMCs) cocultured with adult liver flukes (Opisthorchis viverrini) for 6 to 24 h. PBMC-derived proteins were identified by two-dimensional electrophoresis and mass spectrometry, and the cytok...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.00901-13
更新日期:2014-05-01 00:00:00
abstract::Shiga toxin type 1 (Stx1) belongs to the Shiga family of bipartite AB toxins that inactivate eukaryotic 60S ribosomes. The A subunit of Stxs are N-glycosidases that share structural and functional features in their catalytic center and in an internal hydrophobic region that shows strong transmembrane propensity. Both ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.66.11.5252-5259.1998
更新日期:1998-11-01 00:00:00
abstract::Placenta-sequestering Plasmodium falciparum involved in the pathogenesis of pregnancy-associated malaria (PAM) in otherwise clinically immune women expresses particular variant surface antigens (VSA(PAM)) on the surface of infected erythrocytes that differ from VSA found in parasitized nonpregnant individuals (non-PAM...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.73.7.4112-4118.2005
更新日期:2005-07-01 00:00:00
abstract::Burkholderia cenocepacia strain K56-2 typically has rough colony morphology on agar medium; however, shiny colony variants (shv) can appear spontaneously. These shv all had a minimum of 50% reduction in biomass formation and were generally avirulent in an alfalfa seedling infection model. Three shv-K56-2 S15, K56-2 S7...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.00874-07
更新日期:2008-01-01 00:00:00
abstract::Production of group A streptococcal pyrogenic exotoxins (SPE) type A and C was transferred from toxigenic streptococcal strains to nontoxigenic strains by lysogeny. Lysogens were tested for SPE with Ouchterlony immunodiffusion on Todd-Hewitt agar plates; toxin diffusing from isolated colonies reacted with specific hyp...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.28.1.254-257.1980
更新日期:1980-04-01 00:00:00
abstract::Heat shock protein (HSP) expression was examined in murine bone marrow-derived macrophages infected with stationary-phase promastigotes of Leishmania donovani. Immunoblotting performed with a rabbit polyclonal antiserum raised against HSP60 from Heliothis virescens (moth) revealed the de novo appearance of 65- and 67-...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.61.8.3265-3272.1993
更新日期:1993-08-01 00:00:00
abstract::Immunoglobulin G (IgG)- and IgM-specific antibody titers against Salmonella typhi Ty2 porins have been measured in 30 paired typhoid sera by enzyme-linked immunosorbent assay. These studies have found that IgG serum titers of acute and convalescent sera were 625 and 5,000 times higher, respectively than the control se...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.52.1.209-212.1986
更新日期:1986-04-01 00:00:00
abstract::We found that oral immunization with flagellum-defective mutant strains of Salmonella enterica serovar Typhimurium with the ClpXP-deficient background protected mice against oral challenge with the virulent strain. These data indicate that Salmonella flagellin is not a dominant protective antigen in oral immunization ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.72.4.2449-2451.2004
更新日期:2004-04-01 00:00:00
abstract::The relationship between the sequence of Neisseria gonorrhoeae pilin and its quaternary assembly into pilus fibers was studied with a set of site-directed antibody probes and by mapping the specificities of antipilus antisera with peptides. Buried and exposed peptides in assembled pili were identified by competitive i...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.64.2.644-652.1996
更新日期:1996-02-01 00:00:00
abstract::The Bordetella pertussis BrkA protein protects against the bactericidal activity of complement and antibody; however, some individuals mount an immune response that overcomes this bacterial defense. To further characterize this process, the bactericidal activities of sera from 13 adults with different modes of exposur...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.67.3.1424-1431.1999
更新日期:1999-03-01 00:00:00
abstract::Arg-gingipains are extracellular cysteine proteases produced by the gram-negative periodontal pathogen Porphyromonas gingivalis and are encoded by rgpA and rgpB. Three Arg-gingipains, heterodimeric high-molecular-mass Arg-gingipain HRgpA comprising the alpha-catalytic chain and the beta-adhesin chain, the monomeric so...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.73.8.4864-4878.2005
更新日期:2005-08-01 00:00:00
abstract::The development of immunological responsiveness to a soluble cercarial antigenic preparation (CAP) from Schistosoma mansoni was analyzed in inbred CBA/J mice infected with cercariae, one or multiple times, or sensitized using CAP. Repeated exposure to 75 cercariae at three weekly intervals (3X-75) or subcutaneous admi...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.14.2.502-508.1976
更新日期:1976-08-01 00:00:00
abstract::The short-term kinetics of fluoride uptake by cells from 20- to 22-h cultures of Streptococcus mutans strain 6715 were studied using rapid filtration and centrifugation techniques. Saline-suspended organisms were diluted with fluoride-containing solutions buffered at four different pH values (2.0, 4.0, 5.5, and 8.2). ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.18.3.680-687.1977
更新日期:1977-12-01 00:00:00
abstract::Electron microscopic examination of virulence plasmid-bearing cells of Yersinia enterocolitica revealed the formation of a fibril structure when grown at 37 degrees C but not at 22 degrees C. Plasmidless cells did not exhibit any surface matrix. The formation of this surface component was associated with increased cel...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.46.1.272-275.1984
更新日期:1984-10-01 00:00:00
abstract::Tritrichomonas foetus is a serious veterinary pathogen, causing bovine trichomoniasis, a sexually transmitted disease leading to infertility and abortion. T. foetus infects the mucosal surfaces of the reproductive tract. Infection with T. foetus leads to apoptotic cell death of bovine vaginal epithelial cells (BVECs) ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.72.7.4151-4158.2004
更新日期:2004-07-01 00:00:00
abstract::Antisera were produced by inoculation of mycoplasma cells grown in PPLO broth supplemented with rabbit serum alone or rabbit serum plus Freund complete or incomplete adjuvant. By using an enzyme-linked immunosorbent assay, immunoglobulin G antibodies to cholesterol were detected in antisera to mycoplasmas (Mycoplasma ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.59.6.2200-2202.1991
更新日期:1991-06-01 00:00:00
abstract::Nucleotide-binding oligomerization domain (NOD) protein 1 (NOD1) and NOD2 are pathogen recognition receptors that sense breakdown products of peptidoglycan (PGN) (muropeptides). It is shown that a number of these muropeptides can induce tumor necrosis factor alpha (TNF-alpha) gene expression without significant TNF-al...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.01597-06
更新日期:2007-02-01 00:00:00
abstract::Fibronectin-binding proteins mediate Staphylococcus aureus internalization into nonphagocytic cells in vitro. We have investigated whether fibronectin-binding proteins are virulence factors in the pathogenesis of pneumonia by using S. aureus strain 8325-4 and isogenic mutants in which fibronectin-binding proteins were...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.70.7.3865-3873.2002
更新日期:2002-07-01 00:00:00
abstract::Antibodies directed against Pfs25, a protein present on the surface of zygotes and ookinetes of Plasmodium falciparum, completely block pathogen transmission. We evaluated the immunomodulatory effect of CpG oligodeoxynucleotides (ODN) on the immunogenicity of recombinant Pfs25 (rPfs25) formulated in alum (Al). Immuniz...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/iai.72.1.584-588.2004
更新日期:2004-01-01 00:00:00
abstract::An inactivated oral enterotoxigenic Escherichia coli (ETEC) vaccine against ETEC diarrhea was given to 25 adult Swedish volunteers. The vaccine consisted of formalin-killed E. coli bacteria expressing the most common colonization factor antigens (CFAs), i.e., CFA/I, -II, and -IV, and recombinantly produced cholera B s...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.66.7.3311-3316.1998
更新日期:1998-07-01 00:00:00
abstract::Live attenuated bacteria hold great promise as multivalent mucosal vaccines against a variety of pathogens. A major challenge of this approach has been the successful delivery of sufficient amounts of vaccine antigens to adequately prime the immune system without overattenuating the live vaccine. Here we used a live a...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.02443-14
更新日期:2015-01-01 00:00:00
abstract::Neonates born to female guinea pigs of either a highly susceptible (C4D) or a resistant (Albany) strain, infected prior to or during pregnancy with a single dose of Treponema pallidum, showed in their sera from the first day of life immunoglobulin M (IgM) antibodies to T. pallidum, circulating immune complexes consist...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.60.1.271-277.1992
更新日期:1992-01-01 00:00:00
abstract::Francisella tularensis is a gram-negative pathogen that causes life-threatening infections in humans and has potential for use as a biological weapon. The genetic basis of the F. tularensis virulence is poorly understood. This study screened a total of 3,936 transposon mutants of the live vaccine strain for infection ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.01865-06
更新日期:2007-06-01 00:00:00
abstract::Human peripheral blood monocytes become apoptotic following phagocytosis of Staphylococcus aureus. In this study, we investigated the mechanisms involved in this phenomenon. Cells exposed to bacteria were examined for the surface expression of Fas and Fas ligand (FasL). The level of soluble form of FasL was also measu...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.69.3.1287-1297.2001
更新日期:2001-03-01 00:00:00
abstract::Cells of Candida albicans strain WO-1 and related strains switch frequently and reversibly between a white-colony-forming unit (white phase) and a gray-colony-forming unit (opaque phase). Cells in the budding white phase exhibit the usual smooth round phenotype observed in other C. albicans strains, but cells in the b...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.57.2.458-467.1989
更新日期:1989-02-01 00:00:00
abstract::Phospholipase A2 and lysophospholipase activities were detected in the culture supernatant fluids of a virulent strain of Vibrio vulnificus. The phospholipase A2 was inactivated by heating at 56 degrees C for 30 min, had an apparent molecular weight of greater than or equal to 80,000 (estimated by gel filtration with ...
journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.45.2.458-463.1984
更新日期:1984-08-01 00:00:00