Nascent transport intermediates detach from donor membranes by scission. This process can take place in the absence of dynamin, notably in clathrin-independent endocytosis, by mechanisms that are yet poorly defined. We show here that in cells scission of Shiga toxin-induced tubular endocytic membrane invaginations is preceded by cholesterol-dependent membrane reorganization and correlates with ...

Manganese (Mn) protects cells against lethal doses of purified Shiga toxin by causing the degradation of the cycling transmembrane protein GPP130, which the toxin uses as a trafficking receptor. Mn-induced GPP130 down-regulation, in addition to being a potential therapeutic approach against Shiga toxicosis, is a model for the study of metal-regulated protein sorting. Significantly, however, the...

To facilitate the study of intestinal transmission of the Shiga toxin 1 (Stx1)-converting phage H-19B, Tn10d-bla mutagenesis of an Escherichia coli H-19B lysogen was undertaken. Two mutants containing insertions in the gene encoding the A subunit of Stx1 were isolated. The resultant ampicillin-resistant E. coli strains lysogenic for these phages produced infectious H-19B particles but not activ...

Three monoclonal antibodies, designated MAb 16E6, MAb 13C4, and MAb 19G8, were produced which recognize Shiga-like toxin (SLT) from Escherichia coli. All three monoclonal antibodies neutralized the cytotoxicity of E. coli SLT and were able to immunoprecipitate intact labeled toxin with Staphylococcus aureus protein A. The three antibodies were of the G1 heavy and kappa light chain classes. MAb ...

Escherichia coli O157:H7 was isolated from a fatal case of haemorrhagic colitis with haemolytic uraemic syndrome and neurological symptoms. This strain induced diarrhoea and neurological symptoms including incoordination, ataxia, and convulsions in piglets after oral inoculation. Similar neurological signs were seen in piglets inoculated intraperitoneally with bacterial extracts containing a sh...

fusion of two genes at dna level produces a single protein, known as a chimeric protein. immunotoxins are chimeric proteins composed of specific cell targeting and cell killing moieties. bacterial or plant toxins are commonly used as the killing moieties of the chimeric immunotoxins. in this investigation, the catalytic domain of shiga-like toxin (a1) was fused to human granulocyte macrophage c...

pathogens can be transmitted to the humans through the consumption of contaminated local dairy products such as cheese and, thus, cause pathogenic diseases. shiga toxin produced by escherichia coli can cause mild watery diarrhea as well as serious complications such as hemorrhagic colitis, and hemolytic uremic syndrome and may even lead to death. the present study was conducted to investigate t...

background: immunotoxins are comprised of both the cell targeting and the cell killing moieties. we previously established a new immunotoxin, i.e. shiga toxin granulocyte macrophage-colony stimulating factor (stxa1-gm-csf), comprises of catalytic domain of stx, as a killing moiety and gm-csf, as a cell targeting moiety. in this study, the ability of the immunotoxin to induce apoptosis and doubl...

The introduction of Shiga toxin into the ventricular system of the brain with major location in the third ventricle resulted in a response similar to that following the administration of the toxin either intravenously or by cross-circulation. The intravenous administration at the dosage level employed would have elicited no response. These observations lend support to the hypothesis that Shiga ...

conclusions these results suggest that toxins induce inflammatory responses, particularly through expression of chemokine. recombinant stx and native toxin induced apoptosis by balancing between different pro- and anti-apoptotic bcl-2 family-factors in epithelial cells. in this study, for the first time, recombinant and native stx induction of apoptotic factors and stimulation of immune respons...