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T Koeda

Publications and source records attributed to T Koeda.

At least 127 records · Page 7Linked to original sources
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-4. Toxicity of metabolites of miocamycin: acute toxicity of Mb2 in mice.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites. At previous study, LD0 values of Mb1 were estimated more than 5,000 mg/kg in male and female mice. The object of this study was to evaluate acute toxicity in male and female mice after single oral administration of Mb2, a metabolite of MOM, at a dose level of 5,000 mg/kg as the maximum physically applicable dose. It is concluded that LD0 values of Mb2 were estimated more than 5,000 mg/kg.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-5. Toxicity of metabolites of miocamycin: acute toxicity of Mb2 in rats.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites. At previous study, LD0 values of Mb1 were estimated more than 5,000 mg/kg in male and female rats. The object of this study was to evaluate acute toxicity in male and female rats after single oral administration of Mb2, a metabolite of MOM. It is concluded that LD0 values of Mb2 were estimated more than 5,000 mg/kg.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-6. Toxicity of metabolites of miocamycin: subacute toxicity of Mb2 in rats.

Miocamycin (MOM) is a derivative of midecamycin, a macrolide antibiotic and is metabolized into 4 main metabolites of Mb1, Mb2, Mb6 and Mb12. At previous study, the acute and subacute toxicity of Mb1 and acute toxicity of Mb2 were performed that those metabolites did not exhibit any lethal toxicity even at the maximum physically applicable dose. The object of this study was to examine subacute toxicity in male and female rats after repeated p.o. administration of Mb2 for 5 weeks at a daily dosage of 125, 250, 500 and 1,000 mg/kg. It is, therefore, concluded that Mb2 exerted no toxic effects in this subacute toxicity.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-7. Toxicity of metabolites of miocamycin: acute toxicity of Mb6 in mice.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites. In the present studies, we evaluated acute toxicity and estimated LD50 values of Mb6, one of the main metabolites of MOM, in male and female mice after single oral administration. Observations were continued for 1 week after treatment. The LD50 values were calculated according to Litchfield-Wilcoxon's method. It is concluded that LD50 values of Mb6 were 4,150 mg/kg (3,577.6 approximately 4,814.0 mg/kg) in male mice and 4,000 mg/kg (3,389.8 approximately 4,720.0 mg/kg) in female mice, respectively.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-8. Toxicity of metabolites of miocamycin: acute toxicity of Mb6 in rats.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites of Mb1, Mb2, Mb6 and Mb12. In the previous studies, we estimated LD50 values of Mb6 in male and female mice after single oral administration. The LD50 values were 4,150 mg/kg in male mice and 4,000 mg/kg in female mice, respectively. In the present studies, we evaluated acute toxicity and estimated LD50 values of Mb6 in male and female rats after single oral administration. Observations were continued for 1 week after treatment. It is concluded that LD0 values of Mb6 in male and female rats, were estimated more than 5,000 mg/kg as Mb6 did not exhibit any manifest acute toxicity even at the maximum physically applicable dose of 5,000 mg/kg.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-9. Toxicity of metabolites of miocamycin: subacute toxicity of Mb6 in rats.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites of Mb1, Mb2, Mb6 and Mb12. It is also known that LD50 values of Mb6 were 4,150 mg/kg in male mice and 4,000 mg/kg in female mice but LD0 values in male and female rats were estimated more than 5,000 mg/kg. The object of this study was to examine subacute toxicological effects in male and female rats after repeated oral administration of Mb6 for 5 weeks at a daily dosage of 125, 250, 500 and 1,000 mg/kg. It is concluded that no manifest toxicity was observed in this study with Mb6 in male and female rats after oral administration at dosage levels of 125, 250, 500 and 1,000 mg/kg for 5 weeks.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-10. Toxicity of metabolites of miocamycin: acute toxicity of Mb12 in mice.

We evaluated acute toxicity and estimated LD50 values of Mb12, one of the main metabolites of MOM, in male and female mice after single oral administration. Observations were continued for 1 week after treatment. The LD50 values were calculated according to Litchfield-Wilcoxon's method. It is concluded that LD50 values of Mb12 were 5,750 mg/kg (4,914.5-6,727.5 mg/kg) in male mice and 4,950 mg/kg (4,194.9-5,841.0 mg/kg) in female mice, respectively.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-11. Toxicity of metabolites of miocamycin: acute toxicity of Mb12 in rats.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites of Mb1, Mb2, Mb6 and Mb12. In the previous studies, LD50 values of Mb12 were 5,750 mg/kg in male mice and 4,950 mg/kg in female mice, respectively. The object of this study was to evaluate acute toxicity in male and female rats after single oral administration of Mb12. Observations were continued for 1 week after treatment. It is concluded that LD0 values of Mb12 were estimated more than 5,000 mg/kg.

Animals↗
PubMed1984

Toxicological studies on a new macrolide antibiotic, midecamycin acetate (miocamycin). Part IV-12. Toxicity of metabolites of miocamycin: subacute toxicity of Mb12 in rats.

Miocamycin (MOM) is a derivative of midecamycin and is metabolized into 4 main metabolites of Mb1, Mb2, Mb6 and Mb12. In the previous study, LD0 values of Mb12 in male and female rats were estimated more than 5,000 mg/kg. The object of this study was to evaluate subacute toxicity in male and female rats after repeated oral administration of Mb12 for 5 weeks at a daily dosage of 125, 250, 500 and 1,000 mg/kg. It is concluded that no manifest toxic effects were caused by Mb12 even at the highest dosage level of 1,000 mg/kg/day for 5 weeks to male and female rats.

Animals↗
PubMed1984

Effects of midecamycin acetate (miocamycin), a new macrolide antibiotic, on reproductive performances in rats and rabbits.

Miocamycin (MOM) is a derivative of midecamycin, a macrolide antibiotic isolated from a culture broth of Streptomyces mycarofaciens. The objective of this study was to determine the effect of MOM on reproductive performance in rats and rabbits. MOM, non-crystalline solid, was suspended in 0.1% CMC solution immediately before use. In this study, reproductive performance was studied according to the following designs: Fertility test (Segment I) in Wistar rats Teratogenicity test (Segment II) in Wistar rats Peri- and post-natal tests (Segment III) in Wistar rats Behavioral test in rat newborns in Segments II and III Teratogenicity test (Segment II) in New Zealand white rabbits In conclusion, MOM, non-crystalline solid, might have no teratogenesis and little influence on dams and their fetuses and offsprings.

Abnormalities, Drug-Induced↗
PubMed1984

[Role of taurine in neutrophil function].

The influence of taurine on neutrophil phagocytic and bactericidal capacities and lysosomal enzyme-releasing ability was evaluated in the present study using neutrophils obtained from casein-elicited rat peritoneal exudates. Taurine was dissolved in drinking water at a concentration of 0.3%, and the solution was given to rats for 1-21 days (460 mg/kg/day). Taurine concentration in the serum increased with the term of its administration, while in the neutrophils, it increased significantly after administration for 1 or 3 days. When administered for 7 or 10 days, however, no difference was noted from the control group, but then the concentration remarkably increased after 21 days of administration. The bactericidal capacity of the neutrophils against Escherichia coli was strengthened as their concentration of taurine increased; phagocytic capacity was also strengthened. The release of myeloperoxidase following phagocytosis of yeasts increased with administration, while the release of beta-glucuronidase, lysozyme and lactate dehydrogenase, which are induced by N-formylmethionyl-leucyl-phenylalanine, were inhibited. The hypotonic hemolysis of erythrocytes was also inhibited. Taurine decreased the fluorescence depolarization of diphenylhexatriene, indicating an increase in membrane fluidity. These results suggested that taurine strengthens both phagocytic and bactericidal capacities of neutrophils by increasing the fluidity of neutrophil membrane and membrane stability and thus plays an important role in the mechanism of host defense.

Animals↗
PubMed1983

Prevention of drug-resistant Escherichia coli colonization in chickens by treatment with a faecal fluid.

This study was performed to prove that intestinal colonization in chickens by resistant Escherichia coli strains present in the environment might be prevented when faeces in which sensitive E. coli strains were dominant was administered to newly hatched chicks. The appearance of resistant E. coli strains was markedly reduced. Escherichia coli O49:H12 was the sensitive E. coli strain which formed the major colonizer in the intestinal tract. In young chickens, this strain persisted as a major component, and even when it was a minor colonizer in the faecal fluid administered, it appeared as a major component soon afterwards. This strain is considered to be a good colonizer in the gut of young chickens.

Animals↗