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D G Astaf'ev

Publications and source records attributed to D G Astaf'ev.

11 recordsLinked to original sources
PubMed1991

[The range of antigenic specificity of Bifidobacterium peptidoglycan].

The antigenic relationships of Bifidobacterium bifidum 1 peptidoglycans with different strains of this species (LVA-3, 791, GO-4), bifidobacteria of other species (B. adolescentis GO-13, B. breve 79-38, B. lactentis 79-41, B. longum GO-3) and bacteria of remote taxonomic groups (Streptococcus faecalis 6-3. Staphylococcus aureus COM 885, S. epidermidis COM 2124. Lactobacillus plantarum 1, Escherichia coli M-17) were studied on the basis of a highly sensitive test system permitting the registration of normal human antibodies to peptidoglycans. The level of cross reactions with staphylococci and streptococci correspond to intraspecific and antigenic affinity to L. plantarum and E. coli was considerably less pronounced. Copying a number of epitopes of bifidobacteria, S. aureus peptidoglycan seems to possess additional antigenic determinants which participate in the formation of immunological responsiveness in man.

Antibodies, Bacterial↗
PubMed1991

[The characteristics of Staphylococcus aureus peptidoglycan in the spectrum of the reactivity of human lymphocytes to bacterial peptidoglycans].

The sensitivity of lymphocytes of healthy persons to S. aureus peptidoglycan as compared with that to the polyclonal stimulator zymosan C3b and peptidoglycans of other bacteria (Streptococcus faecalis, Escherichia coli, Bacterium bifidum) was analyzed with a test system permitting the determination of specific reactivity to peptidoglycans. The analysis showed that at the peak of luminol-dependent chemiluminescence (25-30 minutes) individual reactivity to S. aureus peptidoglycan varied within wide limits (the coefficient of lymphocyte stimulation was 1.4-9.6, 3.5 +/- 0.6), exceeding sensitivity to other bacteria, as well as the values obtained in the negative control. The conclusion of the wide spread of sensitization to S. aureus peptidoglycan and the possibility of using this preparation for the study of cell-mediated immunity reactions was made.

Bifidobacterium↗
PubMed1991

[The response of human lymphocytes to Staphylococcus aureus peptidoglycan in a system of opsonic cooperation].

Interaction of lymphocytes with S. aureus peptidoglycan treated with normal human serum and its fractions was studied on the basis of luminol-dependent chemiluminescent reaction. Treatment with whole serum led to the considerable increase and acceleration of lymphocytic reactions. The opsonic effect mainly depended on antibodies and complement, the contribution of other opsonins (which could be partially attributed to fibronectin) did not exceed 30%. IgG and fibronectin in concentrations, similar to their concentration in normal human plasma, enhanced the reactions 3.4 +/- 0.3 (p less than 0.05) and 1.5 +/- 0.005 (p greater than 0.05) times, respectively. The problem of the intrapopulation profile of opsonic-lymphocytic reactions and their role in the system of cell-mediated and humoral interactions is discussed.

Adult↗
PubMed1989

[Reactivity of neutrophils in systems with peptidoglycans of different species of Staphylococcus].

The work presents the results of the comparative study of the luminol-dependent chemiluminescence of human neutrophils stimulated with peptidoglycans of 14 staphylococcal species. The intensity of chemiluminescence greatly varied, which was not linked with specific antigenic and structural features of peptidoglycans. The maximal chemiluminescence was induced by S. aureus and S. cohnii peptidoglycans and the minimal chemiluminescence, by S. lentus and S. epidermidis peptidoglycans. The data obtained in experiments on cross restimulation with homologous and heterologous peptidoglycans suggest that the mechanisms of neutrophil activation are similar in character, differing from the mechanism of latex-induced chemiluminescence. These data were analyzed from the viewpoint of the heterogeneity of bacterial peptidoglycans and its effect on their relationship with neutrophils.

Humans↗
PubMed1987

[Quantitative characteristics of human antibodies to the peptidoglycans of different Staphylococcus species].

The content of antibodies to peptidoglycans of 13 staphylococcal species was studied in the ELISA with the IgG fraction isolated from commercial human immunoglobulin. The content of antibodies to S. aureus peptidoglycan (calculated per mg of protein) was 3.0 micrograms and that of antibodies to peptidoglycans of other species amounted to 1.8-4.1 micrograms. The maximal value was obtained for S. xylosus and the minimal value, for S. lentus. No relationship between the content of antibodies to peptidoglycans and the degree of their antigenic affinity to S. aureus peptidoglycan was noted: the scatter of the values in species with relatively low and even minimal affinity did not exceed the range of variance in the group with a high degree of homology (2.2-2.4 micrograms). The production of antibodies to staphylococcal peptidoglycans was supposed to result from the action of a complex of antigenic determinants, both common and specific for each staphylococcal species.

Antibodies, Bacterial↗
PubMed1986

[Range of the antigenic specificity of peptidoglycan in Staphylococcus aureus compared to other representatives of the Staphylococcus genus].

In investigations based on the use of a highly sensitive test system permitting the detection of normal human antibodies to S. aureus peptidoglycan, the antigenic relationships between the peptidoglycans of S. aureus and other representatives of the genus Staphylococcus have been studied. Among other staphylococcal species, S. simulans, S. xylosus, S. hyicus, S. cohnii, S. hyicus s. s. chromogenes have been found to possess peptidoglycans most closely related to S. aureus peptidoglycans, while S. warneri and S. epidermidis peptidoglycans have proved to be least closely related to it.

Antibodies, Bacterial↗
PubMedDate not supplied

[The manifestation of functional heterogeneity of the peptidoglycans in opsonophagocytic reactions].

The peptidoglycan activity of Staphylococcus aureus CCM 885 and Bifidobacterium bifidum 1 was studied in the opsonophagocytic system on the basis of the luminol-dependent chemiluminescence of human neutrophils. B. bifidum peptidoglycan was more active in direct interaction with neutrophils. After treatment with normal human serum S. aureus peptidoglycan showed more pronounced neutrophil-stimulating properties. This phenomenon was in accord with a higher content of IgG antibodies to S. aureus peptidoglycan, as well as with its capacity for the classical direct activation of the complement. Moreover, in reactions with S. aureus peptidoglycan "minor" opsonins, independent of antibodies and complement, were detected. B. bifidum peptidoglycan did not activate the complement, could not be opsonized with the serum having no specific antibodies and did not react with "minor" opsonins.

Bifidobacterium↗