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At least 1,459 records · Page 81Linked to original sources
PubMed1999

The sigma ligand, igmesine, inhibits cholera toxin and Escherichia coli enterotoxin induced jejunal secretion in the rat.

BACKGROUND: Cholera toxin, and Escherichia coli heat labile (LT) and heat stable (STa) enterotoxins induce small intestinal secretion in part by activating enteric nerves. Igmesine is a novel sigma receptor ligand that inhibits neurally mediated secretion. AIMS: To assess the antisecretory potential of igmesine in cholera toxin, LT, and STa induced water and electrolyte secretion using an in vivo rat model of jejunal perfusion. METHODS: After pretreatment with igmesine, 0.03-10 mg/kg intravenously, jejunal segments of anaesthetised, adult male Wistar rats were incubated with cholera toxin (25 microg), LT (25 microg), or saline. Jejunal perfusion with a plasma electrolyte solution containing a non-absorbable marker was undertaken. In some cases 200 microg/l STa was added to the perfusate. After equilibration, net water and electrolyte movement was determined. In additional experiments rats received igmesine, intravenously or intrajejunally, after exposure to cholera toxin. RESULTS: Cholera toxin induced net water secretion was inhibited by 1 mg/kg igmesine (median -120 versus -31 microl/min/g, p<0.001). LT and STa induced secretion were also inhibited by 1 mg/kg igmesine (-90 versus -56, p<0.03; and -76 versus -29, p<0.01, respectively). Igmesine reduced established cholera toxin induced secretion. CONCLUSION: The sigma ligand, igmesine, inhibits neurally mediated enterotoxigenic secretion. Its ability to inhibit established secretion makes it an agent with therapeutic potential.

Animals↗
PubMed1988

On the in vitro neutralization test of Clostridium perfringens type A toxin.

Data are presented on the detection in crude animal and human sera of Cl. perfringens phospholipase C (PLC) inhibitor. When the level of Cl. perfringens type A antitoxin is determined in the in vitro toxin neutralization test the inhibitor is found to decrease PLC activity in the test dose of experimental homologous toxin. The extent of decrease accounts for the variation of results obtained in the in vitro and in vivo toxin neutralization tests. The variation may be cancelled out by introducing a corresponding coefficient to calculate the level of alpha-antitoxin. It is suggested that the isolation and investigation of the PLC inhibitor will contribute to the development of preparations for treatment of gas gangrene due to Cl. perfringens type A.

Animals↗
PubMed1979

Toxin-neutralizing effect of antibody against subtilisin-digested tetanus toxin.

A form of systemic tetanus with atypical symptoms was observed in mice injected in the left thigh with a mixture of tetanus toxin and antibody produced in guinea pigs against a fragment of toxin obtained from a subtilisin digest of the crystallized toxin. The mice did not show typical symptoms of the local tetanus such as convulsions or spastic paralysis of the injected limb.

Animals↗
PubMed2006

Severe botulism after focal injection of botulinum toxin.

We report a 34-year-old woman who developed clinical botulism after the cosmetic use of an unapproved botulinum toxin type A. Electrophysiologic findings demonstrated complete denervation with complete electrical silence. She had a lengthy recovery but was able to ambulate by discharge.

Adult↗
PubMed1979

Suppression of local intestinal immunoglobulin A immune response to cholera toxin by subcutaneous administration of cholera toxoids.

Cholera toxin has been shown to modulate immune responses, generally producing enhancement when administered simultaneously with antigen and suppression when administered a day or more earlier. In a previous study using chronically isolated ileal loops in rabbits, we found that two subcutaneous (s.c.) "priming" and "boosting" doses of biologically active cholera toxin suppressed the local intestinal immunoglobulin A response to intraloop doses of cholera toxin. In the study reported here, two different biologically inactive but antigenically intact cholera toxoids, glutaraldehyde toxoid and choleragenoid, where administered s.c. by the same immunization schedule as for toxin in the earlier experiment. Suppression of local immune response to intraloop cholera toxin as compared with animals receiving no s.c. inoculations was again found. The results suggest that in this model suppression was immunological (mediated by an immunological mechanism) rather than toxigenic (mediated by biological activity of cholera toxin). In addition, the occurrence of suppression of local intestinal immune response after systemic immunization suggests that suboptimal protection against enteric infections could occur after s.c. vaccination.

Antibody Formation↗
PubMed1984

Polyphosphate-mediated protection from cellular intoxication with Clostridium difficile toxin B.

The influence of polyphosphorylated compounds on intoxication of human lung fibroblasts with Clostridium difficile toxin B was studied. ATP, as well as other nucleoside di-, tri-, and tetraphosphates, inorganic polyphosphates and polyphosphorylated sugars, caused a dose-dependent (1-5 mM range) delay in the appearance of the cytopathogenic effect. With a longer phosphate chain, the delay was more pronounced, although the cytopathogenic effect always developed finally, reaching the level of the control within 20 h. Toxin preparations contained one fraction of molecules able to bind ATP, besides one non-binding fraction. The protective effect of ATP did not depend on its energy producing ability. Neither was the protective effect due to an inactivation of the toxin per se, or to an interference with binding of the toxin to the cells. ATP was protective even upon addition 10 min after the toxin binding step. In the presence of ATP, the toxin remained accessible to neutralization with antitoxin. In analogy with the P-site on diphtheria toxin, we postulate that C. difficile toxin B contains a polyphosphate-binding site. This site is separate from the receptor-binding site, but involved in the interaction of toxin B with the cell surface shortly after the binding step.

Adenosine Triphosphate↗
PubMed1965

ISOLATION AND CHARACTERIZATION OF A TOXIC MOIETY OF LOW MOLECULAR WEIGHT FROM CLOSTRIDIUM BOTULINUM TYPE A.

Gerwing, Julia (The University of British Columbia, Vancouver, B.C., Canada), Claude E. Dolman, and Hardial S. Bains. Isolation and characterization of a toxic moiety of low molecular weight from Clostridium botulinum type A. J. Bacteriol. 89:1383-1386. 1965.-A toxic moiety of low molecular weight has been isolated from a type A strain of Clostridium botulinum, by a method involving ammonium sulfate precipitation and elution through diethylaminoethyl cellulose at pH 5.6. By means of electrophoresis and ultracentrifugation, the toxic substance was shown to be homogeneous; a molecular weight of 12,200 was calculated.

Ammonium Compounds↗
PubMed2000

[Immunity against diphtheria and tetanus in the adult Polish population].

The aim of the study was to evaluate immunity against diphtheria and tetanus in healthy adult population in Poland. For determination of antitoxin IgG antibody, toxoid enzyme-linked immunosorbent assay (Toxoid-ELISA) was used. Serum samples were obtained from different regions of Poland and titrated for diphtheria (n = 2442) and tetanus (n = 827) IgG antitoxin. For calibration of anti-toxins determination, the WHO standard of human diphtheria and tetanus antitoxin was used. About 32% (n = 787) of persons were non-protected against diphtheria (IgG-DTAb < 0.1 IU/ml) and 24% (n = 195) against tetanus (IgG-TTAb < 0.1 IU/ml). In 63% (n = 1528) individuals basic protection for diphtheria and 48% (n = 402) for tetanus (0.1-1.0 IU/ml IgG-DTAb and IgG-TTAb) were observed. Only 5% (n = 127) were fully protected for diphtheria and 28% (n = 230) for tetanus (IgG-DTAb and IgG-TTAb > 1.0 IU/ml). In adults between 30-64 years of age, not vaccinated at least during last 10 years, 43% of persons were non-protected. The study showed insufficient immunity against diphtheria in adults. We indicate booster immunisation for selected group of persons.

Adult↗