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排序方式: 共有70条查询结果,搜索用时 31 毫秒
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Based on the very high prevalence of diseases caused by Helicobacter pylori, particularly in the developing world, and the rapid emergence of antibiotic resistance among clinical isolates, there is a strong rationale for an effective vaccine against H. pylori. In this review we describe recent promising candidate vaccines and prophylactic or therapeutic immunization strategies for use against H. pylori, as well as studies to identify immune responses that are related to protection in experimental animals. We also describe identification of different types of immune responses that may be related to protection against symptoms based on comparisons of H. pylori-infected patients with duodenal ulcers or gastric cancer and asymptomatic carriers. We conclude that there is still a strong need to clarify the main protective immune mechanisms against H. pylori as well as to identify a cocktail of strong protective antigens, or recombinant bacterial strains that express such antigens, that could be administered by a regimen that gives rise to effective immune responses in humans. 相似文献
3.
Chowdhury F Rahman MA Begum YA Khan AI Faruque AS Saha NC Baby NI Malek MA Kumar AR Svennerholm AM Pietroni M Cravioto A Qadri F 《PLoS neglected tropical diseases》2011,5(4):e999
Background
In Bangladesh, increases in cholera epidemics are being documented with a greater incidence and severity. The aim of this prospective study was to identify the prevalence and importance of V. cholerae O1 and enterotoxigenic Escherichia coli (ETEC) as causal agents of severe diarrhea in a high diarrhea prone urban area in Dhaka city.Methodology
Systematic surveillance was carried out on all diarrheal patients admitted from Mirpur between March 2008 to February 2010 at the ICDDR, B hospital. Stool or rectal swabs were collected from every third diarrheal patient for microbiological evaluation.Principal Findings
Of diarrheal patients attending the hospital from Mirpur, 41% suffered from severe dehydration with 39% requiring intravenous rehydration therapy. More diarrheal patients were above five years of age (64%) than those below five years of age (36%). About 60% of the patients above five years of age had severe dehydration compared with only 9% of patients under five years of age. The most prevalent pathogen isolated was Vibrio cholerae O1 (23%) followed by ETEC (11%). About 8% of cholera infection was seen in infants with the youngest children being one month of age while in the case of ETEC the rate was 11%. Of the isolated ETEC strains, the enterotoxin type were almost equally distributed; ST accounted for 31% of strains; LT/ST for 38% and LT for 31%.Conclusion
V. cholerae O1 is the major bacterial pathogen and a cause of severe cholera disease in 23% of patients from Mirpur. This represents a socioeconomic group that best reflects the major areas of high cholera burden in the country. Vaccines that can target such high risk groups in the country and the region will hopefully be able to reduce the disease morbidity and the transmission of pathogens that impact the life and health of people. 相似文献4.
Harimaya A Himi T Fujii N Tarkkanen J Carlson P Ylikoski J Mattila P 《FEMS immunology and medical microbiology》2005,43(3):385-392
Alloiococcus otitidis is a recently discovered pathogen of otitis media. However, only a limited number of studies are available about the pathogenic and immunological role of A. otitidis. The aim of this study was to investigate the activation and the cytokine production of human peripheral blood lymphocytes at the early immune response after stimulation with A. otitidis. After stimulation of whole human peripheral blood lymphocytes for 18 h with whole killed A. otitidis or the three major middle ear pathogens (Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis), the expression of CD69 and the production of cytokines were analyzed. The expression of CD69 on T cells and B cells was dose-dependently enhanced after stimulation with A. otitidis. The release of interleukin (IL)-12 was induced after stimulation with A. otitidis, whereas the release of IL-4 was not induced after stimulation with A. otitidis. In addition, the release of interferon (IFN)-gamma was induced after stimulation with A. otitidis. Although the release of IFN-gamma started within 18 h after stimulation with A. otitidis, intracellular production of IFN-gamma was not observed in either CD4+ T cells or CD8+ T cells within 18 h upon stimulation. The patterns of CD69 expression and T helper-type 1 (Th1)-promoting cytokines production were similarly shown when human peripheral blood lymphocytes were stimulated with the other three major pathogens. Our results suggest that A. otitidis has sufficient immunogenic potential to modulate a host immune response, like the other three major middle ear pathogens, and also suggest that the immunogenicity of A. otitidis is very similar, at the early immune response, to that of the three major middle ear pathogens. 相似文献
5.
Enterotoxigenic Escherichia coli (ETEC) is an important cause of diarrheal disease and deaths among children in developing countries and the major cause of
traveler's diarrhea (TD). Since surface protein colonization factors (CFs) of ETEC are important for pathogenicity and immune
protection is mainly mediated by locally produced IgA antibodies in the gut, much effort has focused on the development of
an oral CF-based vaccine. The most extensively studied ETEC candidate vaccine is the rCTB-CF ETEC vaccine, containing recombinantly
produced cholera B subunit and the most commonly encountered ETEC CFs on the surface of whole inactivated bacteria. Initial
clinical trials with this vaccine showed significant immune responses against the key antigens in different age groups in
Bangladesh and Egypt and protection against more severe TD in Western travelers. However, when tested in a phase-III trial
in Egyptian infants, the protective efficacy of the vaccine was found to be low, indicating the need to improve the immunogenicity
of the vaccine, e.g., by increasing the levels of the protective antigens. This review describes different strategies for
the construction of recombinant nontoxigenic E. coli and Vibrio cholerae candidate vaccine strains over-expressing higher amounts of ETEC CFs than clinical ETEC isolates selected to produce high
levels of the respective CF, e.g., those ETEC strains which have been used in the rCTB-CF ETEC vaccine. Several different
expression vectors containing the genes responsible for the expression and assembly of the examined CFs, all downstream of
the powerful tac promoter, which could be maintained either with or without antibiotic selection, were constructed. Expression from the tac promoter was under the control of the lacI
q repressor present on the plasmids. Following induction with isopropyl-β-d-thiogalactopyranoside, candidate vaccine strains over-expressing single CFs, unnatural combinations of two CFs, and also
hybrid forms of ETEC CFs were produced. Specific monoclonal antibodies against the major subunits of the examined CF were
used to quantify the amount of the surface-expressed CF by a dot-blot assay and inhibition ELISA. Oral immunization with formalin-
or phenol-inactivated recombinant bacteria over-expressing the CFs was found to induce significantly higher antibody responses
compared to immunization with the previously used vaccine strains. We therefore conclude that our constructs may be useful
as candidate strains in an oral whole-cell inactivated CF ETEC vaccine. 相似文献
6.
The 5th International Workshop on Pathogenesis and Host Response in Helicobacter Infections was held in Elsinore, Denmark, 4–7 July, 2002. 相似文献
7.
Taufiqur Rahman Bhuiyan Mohammad Rubel Hoq Naoshin Sharmin Nishat Deena Al Mahbuba Rasheduzzaman Rashu Kamrul Islam Lazina Hossain Jason B. Harris Edward T. Ryan Stephen B. Calderwood Ann-Mari Svennerholm Firdausi Qadri 《Microbes and infection / Institut Pasteur》2018,20(2):122-129
Antibody secreting cells (ASCs) generate antibodies in an antigen-specific manner as part of the adaptive immune response to infections, and these cells increase their surface expression of HLA-DR. We have studied this parameter (HLA-DR+ ASC) in patients with recent diarrheal infection using immuno-magnetic cell sorting and an enzyme linked immunospot (ELISPOT) technique that requires only one milliliter of blood. We validated this approach in adult patients with cholera (n = 15) or ETEC diarrhea (n = 30) on days 2, 7 and 30 after showing clinical symptom at the International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b) hospital in Dhaka, and we compared responses to age-matched healthy controls (n = 7). We found that HLA-DR+ ASC (DR+ASC) responses specific both for T cell-dependent (cholera toxin B subunit), and T cell-independent (lipopolysaccharide) antigens were elevated at day 7 after showing clinical cholera symptom. Similarly, DR+ASCs were elevated against both heat-labile toxin and colonization factors following ETEC infection. We observed significant correlations between antigen-specific DR+ASC responses and antigen-specific, gut homing ASC and plasma antibody responses. This study demonstrates that a simple ELISPOT procedure allows determination of antigen-specific ASC responses using a small volume of whole blood following diarrhea. This technique may be particularly useful in studying DR+ASC responses in young children and infants, either following infection or vaccination. 相似文献
8.
9.
Type V collagen as the target for type-3 fimbriae, enterobacterial adherence organelles 总被引:22,自引:2,他引:22
A.-M. Tarkkanen B. L. Allen B. Westerlund H. Holthöfer P. Kuusela L. Risteli S. Clegg T. K. Korhonen 《Molecular microbiology》1990,4(8):1353-1361
Tissue-binding specificity of the type-3 fimbriae of pathogenic enteric bacteria was determined using frozen sections of human kidney. A wild-type Klebsiella sp. strain and the recombinant strain Escherichia coli HB101(pFK12), both expressing type-3 fimbriae, as well as the purified type-3 fimbriae effectively bound to sites at or adjacent to tubular basement membranes, Bowman's capsule, arterial walls, and the interstitial connective tissue. Bacterial adherence to kidney was decreased after collagenase treatment of the tissue sections. Recombinant strains expressing type-3 fimbriae specifically adhered to type V collagen immobilized on glass slides, whereas other collagens, fibronectin or laminin did not support bacterial adherence. In accordance with these findings, specific binding of purified type-3 fimbriae to immobilized type V collagen was demonstrated. Specific adhesion to type V collagen was also seen with the recombinant strain HB101(pFK52/pDC17), which expresses the mrkD gene of the type-3 fimbrial gene cluster in association with the pap-encoded fimbrial filament of E. coli, showing that the observed binding was mediated by the minor lectin (MrkD) protein of the type-3 fimbrial filament. The interaction is highly dependent on the conformation of type V collagen molecules since type V collagen in solution did not react with the fimbriae. Specific binding to type V collagen was also exhibited by type-3 fimbriate strains of Yersinia and Salmonella, showing that the ability to use type V collagen as tissue target is widespread among enteric bacteria. 相似文献
10.
Cytoskeleton in neuroectodermally derived epithelial and muscle cells of the human iris and ciliary body. 总被引:2,自引:0,他引:2
The cytoskeleton of epithelial and muscle cells of the human iris and ciliary body was analyzed by immunohistochemistry in three morphologically normal formalin-fixed, paraffin-embedded eyes and in 34 eyes containing a uveal melanoma. Both layers of the iris epithelium reacted with monoclonal antibodies (MAb) V9 and Vim 3B4 to vimentin, whereas the ciliary epithelia additionally reacted with MAb CAM 5.2, CK5, KS-B17.2, and CY-90, recognizing cytokeratins 8 and 18. The same cytokeratin MAb labeled the retinal pigment epithelium, which lacked vimentin. The muscle portion of the anterior iris epithelium, which forms the dilator muscle, as well as the sphincter and ciliary muscles, reacted with MAb DE-U-10 to desmin and 1A4 to alpha-smooth muscle actin. The dilator and ciliary muscles also reacted with V9 and Vim 3B4 to vimentin, and some dilator fibers were weakly immunopositive for cytokeratin 8 and 18 with CY-90 and CAM 5.2. The antigenic profile of iris and ciliary epithelia infiltrated by melanoma cells remained unchanged. The intraocular epithelia, which are developmentally related but differ in function, and the intraocular muscles, which differ in origin but are functionally related, have distinct cytoskeletal profiles and may provide insights into the functional significance of intermediate filament expression. 相似文献