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Biomedical subjects

G Ia Kivman

Publications and source records attributed to G Ia Kivman.

At least 19 recordsLinked to original sources
PubMed1992

[Clinical pharmacokinetics of kanamycin in endolymphatic therapy of peritonitis].

The pharmacokinetics of kanamycin in patients with peritonitis was studied after its intramuscular, endolymphatic and lymphotropic administration. Endolymphatic administration of kanamycin provided an increase in its activity in the inflamed tissues of the peritoneum and omentum and markedly prolonged its halflife as compared to those after the routine intramuscular administration of the drug. Lymphotropic administration of kanamycin failed to provide the same effect. Endolymphatic therapy of the patients during the postoperative period provided a decrease in the lethality, development of complications and the terms of the treatment in the hospital. The therapeutic effect of the endolymphatic administration of kanamycin to the patients with peritonitis proved to be high. The more efficient antibiotic therapy of the cases was likely due to favourable shifts in the pharmacokinetics of kanamycin after its endolymphatic administration.

Adolescent↗
PubMed1988

[Competition of antibacterial drugs for binding sites of human serum albumin].

Simultaneous binding of two drugs to human serum albumin (HSA) was studied by flow microcalorimetry. The following drug pairs were used: sulfadimethoxine and cefazolin. Sulfadimethoxine and dicloxacillin, sulfadimethoxine and chlortetracycline. A procedure for estimating the calorimetric titration curves in competing binding of the drugs to the HSA homogeneous active site is described. Comparison of the theoretical and experimental titration curves enabled detection of the ligand competition for the biopolymer binding site. It was shown that sulfadimethoxine displaced cefazolin in the HSA active site, the nature of the HSA association with dicloxacillin and sulfadimethoxine was independent and binding of doxycycline or chlortetracycline to HSA had no influence on sulfadimethoxine interaction with protein.

Anti-Bacterial Agents↗
PubMed1986

[Significance of cellular pharmacokinetic data in predicting antibiotic activity in body cells: comparative research on preparations acting on Pseudomonas aeruginosa].

Penetration of carbenicillin, cefotaxime, gentamicin and sisomicin into leukocytes of peripheral blood in man and their intracellular distribution were studied. By its capacity for penetration into leukocytes cefotaxime was superior to the other antibiotics. The levels of sisomicin and carbenicillin absorption by the cells were equal. The level of gentamicin penetration into the cells was the lowest. After penetration into the cells the main part of carbenicillin was preserved in its active form in the cytoplasm. Absorption of the antibiotic by the nuclei, granules, mitochondria and microsomes was insignificant. Cefotaxime was bound to the organoids and not more than 20 per cent of the antibiotic were preserved in its active form. The aminoglycosides were mainly absorbed by the cell granule fraction and the level of the active form of sisomicin in the cytoplasm was twice as higher as that of gentamicin. On the basis of the data on the cell pharmacokinetics of the above antibiotics, their mean therapeutic serum levels and mean geometric values of their MICs for P. aeruginosa it was suggested that in case of intracellular localization of P. aeruginosa the increase in the antibiotic efficacy was of the following order: gentamicin less than cefotaxime less than or equal to sisomicin less than carbenicillin.

Absorption↗
PubMed1985

[Tetracycline sorption by alveolar macrophages of rabbits at early stages of interaction].

Interaction of rabbit alveolar macrophages with morphocycline, tetracycline and methacycline was studied. The use of the membrane microfiltration technique in investigation of the antibiotic absorption by the macrophages provided description of the time course of the drug interaction with the cells at its early stages. It was shown that the macrophages mainly absorbed the tetracyclines within the first 20 seconds (1 minute incubation). Later, within the period of 1-5 minutes no significant time course was observed. The medium temperature within 4-37 degrees C and the number of the cells in the system (0.1-5 minutes no significant time course was observed. The medium temperature within 4-37 degrees C and the number of the cells in the system (0.5-1 million/ml) had no effect on the parameters of the tetracyclines sorption by the macrophages. The percentage of the decrease of the morphocycline level in the extracellular medium was stable at the drug concentration in the cells ranging within 10-50 micrograms/ml. The respective figures for tetracycline and methacycline were 10-100 and 10-5000 micrograms/ml. Further increasing of the concentration of the antibiotics in the incubation medium resulted in a significant lowering of the percentage of their binding. It was suggested that absorption of the tetracyclines by the cells was associated with their intracellular binding.

Absorption↗
PubMed1985

[Quantitative indicators of gentamicin and sisomicin interaction with isolated subcellular fractions of the liver and kidneys and intracellular distribution of these antibiotics].

Interaction of gentamicin and sisomicin with isolated subcellular fractions of the rat liver and the kidney cortical layer was studied. Distribution of the antibiotics was investigated in a system with the volume ratio of the main components (organoids and cytosol-dissolved drug) simulating the natural volume ratio of the cytoplasm and organoids in the cells. It was shown that lysosomes were the most active elements in binding antibiotics. The microsomes and mitochondria were less active. By the binding capacity the subcellular structures of the kidneys were superior to the analogous structures of the liver. Dissociation of the organoid complexes with the antibiotics was possible, the mobility of the sisomicin complexes being higher than that of the gentamicin complexes. During intracellular distribution the major amount of every of the above aminoglycosides was absorbed by the organoids. Up to 20 per cent of gentamicin and up to 30 per cent of sisomicin remained in the cytoplasm in the active form. The characteristic features of the intracellular distribution of sisomicin (build up of high levels of the free antibiotic in the cytoplasm and relatively easy dissociation of the antibiotic complexes with the organoids of the kidney cortical layer) may define the higher activity of sisomicin as compared to that of gentamicin against intracellularly located microorganisms and its lower potential nephrotoxicity.

Animals↗
PubMed1985

[Macrolide antibiotics: characteristics of their interaction with organoids, intracellular distribution and the effect of sulfalene].

Interaction of erythromycin and oleandomycin with isolated subcellular fractions of rat liver homogenates and intracellular distribution of the antibiotics were studied. It was found that the macrolides were bound by the cell organoids. The binding was partially reversible. The intracellular distribution was characterized by accumulation of erythromycin and oleandomycin in the mitochondrial fraction while erythromycin preserved higher activity in cytosol as compared to oleandomycin. Sulfalen induced redistribution of the macrolides. It decreased absorption of the macrolides by the organoids and increased the concentration of free erythromycin and especially oleandomycin in cytosol.

Animals↗
PubMed1985

[Binding by subcellular fractions of rat liver homogenate and intracellular distribution of antibiotics in acute radiation injury].

In vitro binding of tetracycline, gentamicin, erythromycin and rifampicin by the liver organoids and intracellular distribution of the antibiotics in the hepatocytes of rats with acute irradiation disease were studied. Total gamma-irradiation of the animals with 60Co in a dose of 750 R resulted in the development of a typical radiation disease and induced pronounced changes in binding of tetracycline, gentamicin and erythromycin by isolated subcellular fractions. Simultaneous impairment of the antibiotic intracellular distribution was observed. Rifampicin interaction with the cell structures was unchanged. It is suggested that there is a relation between the level of the impairment of the antibiotic cell pharmacokinetics in acute radiation disease and the mechanism of the drug intracellular binding in health.

Animals↗
PubMed1984

[Interaction of rifampicin with hepatocyte organoids in rats and its intracellular distribution].

Interaction of rifampicin with isolated subcellular fractions of the rat liver (binding and dissociation of the complexes) and intracellular distribution of the antibiotic were studied in the presence of the main organoids taken in the ratio close to the natural volume ratio of the hepatocyte cell components. The nuclei and mitochondria were most active during drug binding. The microsomes were less important. Rifampicin formed mobile complexes with organoids and was easily released from the subcellular fractions recovering its activity on washing. The intracellular distribution was the following: 37.7 per cent of rifampicin in the active form was accumulated in cytosol and the remaining amount was reversibly bound in the fractions of the nuclei, mitochondria and microsomes. The characteristic features of the cell pharmacokinetics of rifampicin, i.e. significant concentration in cytosol, possible deposition in the subcellular structures and at the same time the capacity for recovery of the activity might define the antimicrobial potential of this antibiotic in respect to the intracellular microorganisms.

Animals↗
PubMed1984

[Tetracycline penetration into human peripheral blood leukocytes and their intracellular distribution].

The studies showed that the tetracyclines tested (morphocycline, tetracycline and methacycline) penetrated into leucocytes of the human peripheral blood. Agranulocyte absorbed the drugs more actively than granulocytes. Pinocytosis was suggested to be involved in the penetration. On interaction with intracellular structures the tetracyclines reversibly bound to the organoid cells lost their biological activity to a significant degree. Progressive dissociation of organoid-drug complexes and the egress of tetracyclines from the cells were likely to occur as their contents in the extracellular environment decreased. The penetration capacity and subcellular structure affinity of methacycline were the highest among the drugs tested. It is suggested that penetration of the tetracyclines through the cytoplasmic membranes and their distribution inside the cells are reciprocal.

Absorption↗
PubMed1983

[Intracellular distribution of tetracyclines in rat hepatocytes].

Distribution of tetracyclines, such as oxytetracycline, morphocycline, tetracycline, doxicycline and methacycline in the liver cells of rats was studied. The ratio of the subcellular structures, i. e. nuclei, mitochondria and microsomes and the liquid phase containing the drugs in the dissolved state in the system studied was close to the natural ratio of the hepatocyte organoids and cytoplasm. Distribution of tetracyclines in the subcellular fractions was not uniform. The nuclei did not absorb the drugs. The role of microsomes in drug absorption was insignificant. The mitochondria bound the highest amounts of the drugs and defined the characteristics of their intracellular distribution. The amounts of the drugs in the active form remaining in the cytoplasm after their contact with organoids were low. At the same time there was observed a a definite activating effect of the cytoplasm components on the antibiotics contained in it.

Animals↗
PubMed1982

[Use of agar diffusion method for separate determination of concentration of streptomycin and rifampicin in the blood in the presence of isoniazid].

Conditions for determination of streptomycin and rifampicin in the blood serum on their combined use, as well as in the presence of isoniazid are described. For determination of the blood levels of streptomycin administered in combination with rifampicin it is recommended tat a variant of Bac. mycoides 537 resistant to rifampicin be used. When the rifampicin levels are determined in undiluted serum, the value obtained should be multiplied by 1.4. When a 2-fold dilution of the serum is used, the value is multiplied by 1.15. This provides an indicator maximally close to the real content of the antibiotic in the blood serum.

Bacillus↗
PubMed1982

[Tetracycline antibiotic interaction with the subcellular fractions of rat liver homogenate].

Binding of tetracyclines, i. e. tetracycline, oxytetracycline, morphocycline, methacycline and doxycycline by subcellular fractions of rat liver homogenates was studied on randombred albino rats. It was shown that the drugs lost their activity to a significant extent on contact with nuclei, mitochondria, microsomes and the fraction mixtures. The mitochondrial fraction bound the highest amounts of the drugs. The binding level of methacycline by the organoids was the highest, while that of morphocycline was the least. Binding of the tetracyclines with the subcellular fractions of the liver was to a certain extent reversible. Accumulation of the antibiotic in the cells may be advantageous from the viewpoint of its effect on the intracellular microbes if possible subsequent dissociation from its complex with organoids is considered. At the same time the mitochondriatropic properties of the tetracyclines may be the basis for their toxic effect on the host cells.

Animals↗
PubMed1982

[Role of age in the interaction of tetracycline with the subcellular fractions of rat liver homogenate].

The effect of the rat age on the binding of tetracyclines to the subcellular fractions of liver homogenates was studied. The tetracyclines significantly lost their activity after the contact with the cell organoids. The level of the binding was lower in the newborn and old rats, the complex of tetracycline with mitochondria being less stable. The greater part of the antibiotic reduced its activity after washing of the organoids. The deposition of the antibiotics in the cells was the most pronounced in the pubertal animals.

Aging↗
PubMed1982

[Organ and species factor in the phenomenon of tetracycline interaction with animal subcellular fractions].

Binding of the tetracyclines by the cell components of various organs of rats was studied comparatively. It was shown that binding of the tetracyclines by the subcellular fractions was decreasing as follows: the liver, the heart, the kidneys. The mitochondria were the fraction most actively binding the antibiotics. For determination of the features of this process the characteristics of tetracycline binding by the liver organoids of the rats and rabbits were compared. The quantitative indices of binding of the tetracyclines by the cell components of the rats and rabbits were rather similar.

Animals↗
PubMed1981

[Effect of propolis on Staphylococcus aureus strains resistant to antibiotics].

The activity of propolis and its combinations with antibiotics against antibiotic resistant strains of Staphylococcus aureus was studied. It was found that staphylococcae strains resistant to benzylpenicillin, tetracycline and erythromycin were mainly sensitive to propolis. It is concluded that there was synergism in the effect of propolis and antibiotics with respect to antibiotic resistant strains of Staphylococcus aureus.

Anti-Bacterial Agents↗
PubMed1978

[Method of determining the antimicrobial activity of alcohol extracts of propolis].

It is proposed to determine the antimicrobial activity of propolys alcohol extracts by the method of subsequent dilutions in solid nutrient media. Dilution of the extracts immediately in hot agar eliminated the inhibiting effect of the extragent on the microbial growth. Opalesence appearing in the agar did not prevent estimation of the results in contrast to the method of subsequent dilutions in liquid nutrient media.

Bacillus cereus↗
PubMed1976

[Antibiotic interaction with proteolytic enzymes].

The effect of penicillin, tetracycline, aminoglucozide antibiotics and streptomycin on BAEE-esterase activity of trypsin was studied. It was found that benzylpenicillin in amounts of 50, 100 and 300 mg, ampicillin in an amount of 25 mg, methicillin in an amount of 12 mg and tetracycline in an amount of 2.5 mg as calculated per 1 mg of trypsin had no effect in vitro on the esterase activity of the enzyme. Neomycin, kanamycin and streptomycin in amounts of 5, 10, 100 or 300 mg per 1 mg of trypsin catalyzed splitting of BAEE by trypsin. When the antibiotics were added to the bile, its esterase activity increased. Preliminary intramuscular administration of trypsin and kanamycin to the rats had no effect on the ampicillin levels in the blood serum and brain and did not affect the permeability of the hemato-encephalic barrier as compared to the use of trypsin alone.

Aminoglycosides↗