Biomedical subjects

W H Habig

Publications and source records attributed to W H Habig.

At least 37 records · Page 2Linked to original sources

PubMed1985

Antibodies against the light chain of tetanus toxin in human sera.

Tetanus toxoid elicits protective antibodies against tetanus toxin in humans and animals. It has been reported that antitoxin from immunized humans contains no anti-light chain antibodies, based on immunodiffusion and quantitative precipitin analyses. We confirmed the absence of precipitating anti-light chain antibodies in tetanus immune globulin. However, the presence of antibodies against the light chain of the toxin was shown by direct binding and inhibition analyses, using enzyme-linked immunosorbent assays. Using a neutralization inhibition test, we also found that about one-fourth of the neutralizing antibodies in tetanus immune globulin are directed against the light chain. These results suggest that the light chain of tetanus toxin contains immunogenic determinants and that antibodies directed against it may have a role in the prevention of tetanus or treatment of tetanus or both.

Antibody Specificity↗

PubMed1984

2-Propylthiouracil does not replace glutathione for the glutathione transferases.

2-Propylthiouracil has been reported as replacing glutathione as a substrate for the glutathione transferases of rat liver. This observation has been examined with several homogeneous glutathione transferases that were prepared from human and rat liver by different methods in three laboratories. No evidence was obtained for 2-propylthiouracil as a substrate for glutathione transferase in the several reactions tested.

Animals↗

PubMed1984

The structural gene for tetanus neurotoxin is on a plasmid.

A pool of synthetic oligonucleotides was prepared based on the amino terminal amino acid sequence of tetanus toxin. This probe hybridized to plasmid DNA isolated from three toxigenic strains of Clostridium tetani but not to plasmid DNA from a nontoxigenic strain. These results show that the structural gene for the toxin is on the plasmid. The pCL1 plasmid from one of the toxigenic strains spontaneously deleted 22 kilobase pairs of DNA to form pCL2. Strains harboring this deleted plasmid are nontoxigenic. However, the probe mixture hybridized to pCL2, indicating that the DNA encoding the amino terminus of the toxin had not been deleted. Restriction endonuclease cleavage maps of pCL1 and pCL2 were constructed and indicate the approximate location and orientation of the structural gene for tetanus toxin.

Amino Acid Sequence↗

PubMed1984

Binding of tetanus toxin to somatic neural hybrid cells with varying ganglioside composition.

125I-labelled tetanus toxin interaction with several somatic hybrid cell lines was investigated. Binding of toxin is most effective in NCB-20, followed by NBr-10A, NG108-C15, and SB21-B1 cells. Specific binding of toxin to NCB-20 and SB21-B1 cells is 7- and 60-fold lower, respectively, in comparison to enriched rat cerebral neuron cultures. The NCB-20, NBr-10A, and NG108-C15 clones display a complex ganglioside pattern, including the presence of [N-acetyl-neuraminyl]-galactosyl-N-acetylgalactosaminyl[ N-acetylneuraminyl]-galactosylglucosyl-ceramide (GD1a) and two unidentified [14C]galactose-labelled lipid-soluble compounds, while the SB21-B1 is most abundant in [N-acetyl-neuraminyl]-galactosylglucosyl-ceramide (GM3) and N-acetyl-galactosaminyl-[N-acetyl-neuraminyl]-galactosylglucosyl-c eramide (GM2) gangliosides. None of the cells tested contain measurable levels of [14C]galactose-labelled or resorcinol-positive bands of galactosyl-N-acetyl-galactosaminyl-[ N-acetylneuraminyl-N-acetylneuraminyl]-galactosylglucosyl-ceramide (GD1b) and [N-acetylneuraminyl]-galactosyl-N-acetylgalactosaminyl-[ N-acetylneuraminyl-N-acetylneuraminyl]-galactosylglucosyl-ceramide (GT1b) gangliosides. After 2 h at 37 degrees C a near plateau of toxin association with NCB-20 cells is seen. Binding in low-ionic-strength medium is 1.35-fold higher at 37 degrees C than at 4 degrees C, but is reduced by 21 and 51% at 4 degrees C and 37 degrees C, respectively, in physiologic medium. Treatment of NCB-20 cells with neuraminidase causes a partial loss (29%) of toxin-binding sites. Binding to the hybrid cells is significantly different from that of cerebral cultures with respect to temperature, salt effect, and sensitivity to neuraminidase, suggesting perhaps a different class of receptors for the toxin.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

PubMed1984

Mechanism of tetanolysin-induced membrane damage: studies with black lipid membranes.

Tetanolysin produced similar rates of leakage of K+ and hemoglobin from erythrocytes. When studied by using cholesterol-containing black lipid membranes, this hemolysin induced conductance steps with a broad frequency distribution. These findings are inconsistent with the formation of structural channels and suggest that tetanolysin acts by causing lipid perturbations.

Bacterial Toxins↗

PubMed1983

Developmental and neurochemical specificity of neuronal deficits produced by electrical impulse blockade in dissociated spinal cord cultures.

Blockade of spontaneous electrical activity in dissociated fetal spinal cord cultures produced neuronal deficits as measured by biochemical and morphological techniques. Spinal cord cultures exhibited an age-dependent vulnerability to impulse blockade with tetrodotoxin (TTX) or xylocaine. Neuronal cell counts, [125I]tetanus toxin fixation and [125I]scorpion toxin binding indicated that TTX application produced neuronal deficits during the second or third week in culture. Application of TTX during the first or fourth week did not produce a difference in tetanus toxin fixation from controls. Radioautography of [125I]tetanus toxin revealed no obvious change in the label distribution after TTX treatment. Suppression of electrical activity during the first 6 days in culture had no effect on choline acetyltransferase (CAT) activity and no apparent effect on the appearance of the cultures. Application of TTX during the seventh day in culture decreased CAT activity to 68% of control. Chronic electrical blockade produced a progressively greater loss of CAT activity through 21 days in culture. GABAergic neurons, as indicated by high-affinity GABA uptake, glutamic acid decarboxylase activity and [3H]GABA radioautography, were not affected by electrical blockade. These data indicate that there is developmental and neurochemical specificity in the neuronal death produced by blocking spontaneous electrical activity in dissociated spinal cord cultures.

Animals↗

PubMed1983

Monoclonal antibodies as probes of tetanus toxin structure and function.

Monoclonal antibodies specific for fragment B, fragment C, and light chain of tetanus toxin were prepared by fusion of P3X63Ag8 BALB/c myeloma cells with spleen cells from BALB/c mice immunized with tetanus toxoid or fragment B. Hybridoma colonies were assayed for antibody production by an enzyme-linked immunosorbent assay. Fourteen positive clones were identified, cloned by limiting dilution, and injected intraperitoneally into mice to obtain ascites fluids. Thirteen of the monoclonal antibodies were of the immunoglobulin G1 subclass and one was immunoglobulin G2. Two of the antibodies were directed against sites on fragment C, nine were directed against the light chain, and three were directed against the portion of fragment B which does not comprise the light chain of tetanus toxin. At least one antibody in each group exhibited significant toxin neutralization activity. However, only one of these neutralizing antibodies strongly inhibited the binding of 125I-tetanus toxin to ganglioside-coated plates. These data indicate that interference with receptor recognition is not the only means of neutralizing tetanus toxin. Monoclonal antitoxins as potential therapeutic and prophylactic reagents are discussed.

Animals↗

PubMed1983

Tetanus toxin: convulsant action on mouse spinal cord neurons in culture.

The effects of direct application of tetanus toxin on fetal mouse spinal cord neurons in culture are described. Tetanus toxin produces increased excitation characterized by paroxysmal depolarizing events (PDE). In contrast to the abrupt onset of convulsant action produced by postsynaptic glycine antagonist strychnine, the convulsant action of tetanus occurs after a dose-dependent latent period. The onset of the convulsant action of tetanus toxin is paralleled by a reduction in observed spontaneous inhibitory synaptic potentials. Excitatory synaptic events can be identified as components of some tetanus-PDE. The toxin does not alter postsynaptic responses to the inhibitory amino acids glycine and gamma-aminobutyric acid. The latency and convulsant action of tetanus toxin are consistent with an irreversible presynaptic membrane interaction that reduces inhibitory transmission, a mechanism of action distinct from those of convulsants that antagonize inhibitory transmitters at the postsynaptic membrane.

Action Potentials↗

PubMed1982

Receptor-mediated endocytosis of diphtheria toxin by cells in culture.

The binding and uptake of fluorescently labeled diphtheria toxin by cells in culture has been examined by using epifluorescence video intensification microscopy. Rhodamine-labeled diphtheria toxin retained significant toxicity on bioassay and in cell culture and was tested for uptake by human WI-38 and mouse 3T3 fibroblasts grown in culture. When added to cells at 37 degrees C, toxin was observed to become concentrated and internalized in discrete vesicles in both cell lines. The appearance of fluorescent clusters could be prevented by addition of excess unlabeled diphtheria toxin to the medium or by addition of ATP (which has been shown to block toxin binding to cells), indicating that the rhodamine-labeled toxin was binding to diphtheria toxin-specific cell surface binding sites. When the simultaneous uptake of rhodamine-labeled diphtheria toxin and fluorescein-labeled alpha 2-macroglobulin was monitored, the two proteins appeared in the same clusters indicating that the toxin undergoes receptor-mediated endocytosis. Despite the difference in susceptibility to diphtheria toxin of cells derived from sensitive (human) and resistant (mouse) tissues, the behavior of the rhodamine-labeled derivative in both cell lines was indistinguishable in terms of toxin required for formation of clusters or inhibition by unlabeled toxin or by ATP. These results demonstrate that diphtheria toxin-specific cell surface binding sites occur on both insensitive and sensitive cells and suggest that toxin is processed similarly by both cell types during its initial cell surface binding and internalization by this pathway. The possible involvement of this uptake system in the mechanism of action of diphtheria toxin in cells is discussed.

Animals↗

PubMed1982

Structural characteristics of tetanolysin and its binding to lipid vesicles.

Tetanolysin binding to lipid vesicles was found to depend on the molar ratio of cholesterol to phospholipid, being low in vesicles containing up to 20 mol% cholesterol and high in vesicles containing more than 33 mol%. High concentrations of purified tetanolysin preparations formed arc- and ring-shaped structures. The structures were not readily detectable in diluted preparations unless incubated with lipid vesicles containing high molar ratios of cholesterol to phospholipid. It is suggested that the toxin is concentrated on the vesicles to local concentrations high enough to form the arcs and rings.

Bacterial Toxins↗

PubMed1981

Tetanus toxin association with developing neuronal cell cultures. Kinetic parameters and evidence for ganglioside-mediated internalization.

Rat cerebral neurons maintained in monolayer culture accumulate 125I-labeled tetanus toxin. Accumulation is receptor-mediated; i.e. it can be prevented by including unlabeled tetanus toxin, gangliosides, or tetanus antitoxin in the incubation medium but not by including tetanus toxoid, high concentrations of serum, or thyrotropin. Accumulation is time-dependent, reaching a plateau after approximately 3 h when 60% of the added toxin is associated with the cells. It is better at 0 degrees C than at ambient temperature and is significantly higher when 0.25 M sucrose replaces physiological salts in a medium containing 5% serum. Unlabeled tetanus toxin, tetanus antitoxin, and tetanus toxoid do not release the accumulated 125I-labeled tetanus toxin to any significant degree; however, gangliosides (50 micrograms/ml) can release 30% of the accumulated 125I-labeled toxin. Treatment of cells with Triton X-100, under conditions where over 90% of the lipids and 70% of the gangliosides are removed, extracts only 15% of the cell-associated 125I-labeled toxin. Evidence is presented that over 50% of the accumulated toxin is internalized in a cellular compartment which is not in immediate equilibrium with the extracellular environment and which is associated with detergent-insoluble cellular constituents. The tetanus toxin accumulated in this compartment has the same gel electrophoretic pattern as the native toxin and is bioactive. The role of gangliosides as potential shuttle vehicles for tetanus toxin internalization is discussed as are the implications of these data to in vitro studies of the pathogenesis of tetanus-induced neurotoxicity.

Animals↗

PubMed1981