Search PubMed⌕ Search

Biomedical subjects

J Kitamura

Publications and source records attributed to J Kitamura.

At least 55 records · Page 3Linked to original sources
PubMed1985

Genetic toxicity of several antihypertensive drugs possessing a hydrazine group.

Mutagenicity and genotoxicity of antihypertensive drugs, ecarazine, budralazine, benzerazide, and carbidopa were compared with those of hydralazine whose genetic toxicity and carcinogenicity were well established. Ecarazine and budralazine as well as hydralazine showed apparent mutagenicity in Salmonella/microsome test using a strain TA 100 and weak mutagenicity in strains TA 97 and 2637. Benzerazide and carbidopa showed merely weak mutagenicity in TA 100. None of tested drugs except hydralazine exerted any positive result in hepatocyte primary culture (HPC)/DNA repair test, indicating no genotoxic activity of these hydrazine drugs.

Animals↗
PubMed1984

A comparative study on cytotoxicities and biochemical properties of anthraquinone mycotoxins emodin and skyrin from Penicillium islandicum Sopp.

The anthraquinone mycotoxins emodin and skyrin were examined for the inhibitory effects on murine leukemia L1210 culture cells, oxidative phosphorylation of rat liver mitochondria, and Na+, K+-activated ATPase activity of rat brain microsomes to find the differences between their modes of toxic action. Skyrin exhibited a stronger inhibitory effect than emodin on the growth of L1210 culture cells. Emodin showed a stronger uncoupling effect than skyrin on mitochondrial respiration. Skyrin inhibited Na+, K+-activated ATPase activity of rat brain microsomes but emodin did not inhibit.

Animals↗
PubMed1983

Genotoxicity of quinone pigments from pathogenic fungi.

The genotoxicity and mutagenicity of several kinds of quinone pigments from pathogenic fungi were examined by means of the hepatocyte primary culture (HPC)/DNA repair test and of Ames test with TA98 and TA100. Clear genotoxicity of the two quinone chemicals, xanthomegnin and luteosporin were observed in the HPC/DNA repair test, though definite mutagenicity was not detected in the Salmonella microsome test. These two pigments are thus suspected to be genotoxic carcinogens.

Animals↗
PubMed1983

The uncoupling effect of flavoglaucin, a quinol pigment from Aspergillus chevalieri (Mangin), on mitochondrial respiration.

The effects of flavoglaucin from Aspergillus chevalieri (Mangin) Thom et Church on mitochondrial reactions have been investigated to obtain insight into the mode of actions on biomembranes by means of isolated rat liver mitochondria. It was found that flavoglaucin exhibited a strong uncoupling effect on oxidative phosphorylation, enhanced the latent ATPase activity, and elicited a drastic swelling of mitochondria. These reactions led to the exhaustion of ATP in cells, which may be, in part, responsible for its cytotoxicity. Flavoglaucin was toxic to isolated rat hepatocytes causing a karyoklasis, but did not show genotoxicity in hepatocyte primary culture (HPC)/DNA repair test.

Adenosine Triphosphatases↗
PubMed1980

Lysis of growing fissin-yeast cells induced by aculeacin A, a new antifungal antibiotic.

Cells of Schizosaccharomyces pombe grown in the presence of aculeacin A, a peptide antibiotic, were lysed resulting the death of cells. Under high osmolarity, the cellular lysis induced by aculeacin A was considerably reduced. The use of synchronous-culture systems distinguished cell elongation from cell division revealed that the sites of aculeacin A-induced lysis on the fission yeast were the end(s) and the cell plate region, corresponded to the regions of the cell wall synthesis. Aculeacin A-resistant survivors exhibited morphological alterations which were swollen at one or both ends of the cell and appeared drumstick or dumbbel like; the wall of the bulge region was observed to be stained with a fluorescent brightner, as well as that of the cell plate region. These effects of aculeacin A are discussed as compared with effects of 2-deoxy-D-glucose.

Antifungal Agents↗