Shiga toxin is considered to be one of the main causes of severe side effects, such as the hemolytic uremic syndrome, of shigellosis. The genetic determinants for a fusion of its B-subunit (StxB), which mediates toxin binding to target cells, with the COOH-terminus of Escherichia coli hemolysin A (Stx'-'HlyA) has been combined with the determinants of the accessory translocator proteins HlyB and HlyD in a Notl cassette. This cassette has been integrated via a mini-transposon into a recombinant vaccine strain that expresses Shigella flexneri Y and Shigella dysenteriae 1 O-antigen lipopolysaccharides. Characterisation of the resulting strains showed that they maintain all the vaccine-relevant biological properties of the carrier and export efficiently the StxB'-'Hly A fusion peptide into the culture medium. Polyclonal antibodies raised against the StxB'-'HlyA fusion exhibited neutralizing activity in the HeLa cytotoxicity assay. The newly developed strains thus represent promising bivalent vaccine candidates against severe shigellosis caused by S. dysenteriae 1 and S. flexneri Y.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1006/mpat.1996.0061 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Synergistic efficacy of phage Henu10 with antibiotics against with insight into phage resistance and fitness trade-offs.
Front Cell Infect Microbiol
December 2024
Gynaecology Department, Hua County People's Hospital, Anyang, China.
Introduction: The irrational use of antibiotics has facilitated the emergence of multidrug- resistant ., undermining the effectiveness of the currently available antibiotics. Consequently, there is an urgent need to explore new approaches, with phage therapy emerging as a promising alternative.
View Article and Find Full Text PDFA newly developed oral infection mouse model of shigellosis for immunogenicity and protective efficacy studies of a candidate vaccine.
Infect Immun
December 2024
Division of Clinical Medicine, ICMR-National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal, India.
infection poses a significant public health challenge in the developing world. However, lack of a widely available mouse model that replicates human shigellosis creates a major bottleneck to better understanding of disease pathogenesis and development of newer drugs and vaccines. BALB/c mice pre-treated with streptomycin and iron (FeCl) plus desferrioxamine intraperitoneally followed by oral infection with virulent resulted in diarrhea, loss of body weight, bacterial colonization and progressive colitis characterized by disruption of epithelial lining, loss of crypt architecture with goblet cell depletion, increased polymorphonuclear infiltration into the mucosa, submucosal swelling (edema), and raised proinflammatory cytokines and chemokines in the large intestine.
View Article and Find Full Text PDFShiga Toxins Produced by Enterohaemorrhagic Induce Inflammation in Toxin-Sensitive Cells through the p38 MAPK/MK2/Tristetraprolin Signaling Pathway.
J Microbiol Biotechnol
December 2024
Environmental Diseases Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea.
Shiga toxins (Stxs), produced by serotype 1 and certain pathotypes, cause hemorrhagic colitis, which can progress to hemolytic uremic syndrome (HUS) and central nervous system (CNS) pathology. The underlying mechanisms of toxin-induced inflammation remain unclear. The p38 mitogen-activated protein kinase (MAPK) and its downstream target, MAPKAPK2 (MK2), play key roles in various cellular responses.
View Article and Find Full Text PDFShigella sonnei: epidemiology, evolution, pathogenesis, resistance and host interactions.
Nat Rev Microbiol
November 2024
Cambridge Institute for Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge, UK.
Shigella sonnei is a major cause of diarrhoea globally and is increasing in prevalence relative to other Shigella because of multiple demographic and environmental influences. This single-serotype species has traditionally received less attention in comparison to Shigella flexneri and Shigella dysenteriae, which were more common in low-income countries and more tractable in the laboratory. In recent years, we have learned that Shigella are highly complex and highly susceptible to environmental change, as exemplified by epidemiological trends and increasing relevance of S.
View Article and Find Full Text PDFBiological activity of alkaloids from kenaf bast fibres.
Nat Prod Res
November 2024
Institute of Bast Fiber Crops, Chinese Academy of Agriculture Sciences, Changsha, China.
Alkaloids are a kind of important antibacterial components in plants. In order to explore its biological activity of alkaloids from kenaf bast fibres, the alkaloids were extracted from kenaf bast fibres and then its antibacterial activity has been evaluated in this study. The total content of crude alkaloids was 46.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!