Search PubMed⌕ Search

Biomedical subjects

K Yano

Publications and source records attributed to K Yano.

At least 829 records · Page 46Linked to original sources
PubMed1975

[Absorption, distribution and excretion of 14C-josamycin and 14C-josamycin propionate in rats (author's transl)].

Abosrption, distribution and excretion of 14C-josamycin (JM) and 14C-josamycin propionate (JM-P) were studied in rats by measuring both antibacterial activity and radioactivity. 1. In antibacterial activity, plasma and tissue concentrations of JM-P showed a similar tendency to those of JM. Those concentrations of JM reached a peak at 1 hour after administration with a subsequent rapid decrease, while the peak level of JM-P appeared 2 approximately 4 hours after administration and then fell down very slowly. 2. In radioactivity, oral administration of JM-P rapidly produced a very high plasma and tissue concentrations which were in lung, liver, kidney and spleen more than twice those of JM. These results showed that when given orally, JM-P is well absorbed with distributions at high concentrations especially in lung, liver, and kidney and spleen. 3. The ratios of bioactivity/radioactivity in JM administration were the highest in lung and the lowest in liver at 1 hour after. But those of JM-P were generally much lower than those of JM because of higher distribution of JM-P radioactivity into tissues. 4. Four days after oral administration of JM and JM-P, 23.1% and 21.8% of the given radioactivity were recovered respectively from urine. However, the antibacterial activities recovered were 0.40% for JM and 0.65% for JM-P. 5. Biliary recoveries of JM and JM-P were 17.2% and 12.1% of administered radioactivity 2 days after oral administration. On the other hand, 0.47% of JM and 0.17% of JM-P were excreted into bile as antibacterial activity. These results showed that JM and JM-P were excreted into rat urine and bile as some metabolites with less biological activity. 6. The amounts of JM and JM-P recovered from feces were 75.7% and 60.2%, respectively, of the orally given radioactivity. The amount of radioactivity recovered from expiration air was about 1% of either orally given JM or JM-P.

Animals↗
PubMed1974

Chemical studies on damages of Escherichia coli by the immune bactericidal reaction. I. Release and degradation of phospholipids from damaged bacteria.

When antibody-sensitized Escherichia coli B is treated with complement in the absence of lysozyme, bacterial phospholipids or fragments containing phospholipid appear in the surrounding medium. Almost at the start of the reaction, a little phosphatidylethanolamine (PE) appears in the lipid fraction extracted from the supernatant of the reaction mixture. Later it does not increase greatly in amount but free fatty acids (FFA) and lysophosphatidylethanolamine (LPE) appear and increase gradually. Addition of lysozyme to the reaction mixture changes the amounts of FFA and LPE released, but does not increase the numbers of the spots on a thin layer chromatogram of the lipid fraction of the supernatant. The FFA fraction contains no beta-hydroxymyristic acid from lipid A of the lipopolysaccharide complex.

Animals↗
PubMed1974

Chemical studies on damages of Escherichea coli by the immune bactericidal reaction. II. Release of phosphatidylethanolamine from a phospholipase A-deficient mutant of E. coli during the immune bactericidal reaction.

When an antibody-sensitized, phospholipase A-deficient mutant of Escherichia coli B/SM was treated with complement in the absence of lysozyme, bacterial phosphatidylethanolamine (PE) was liberated into the lipid fraction of the surrounding medium, but only traces of its degradation products were found in this fraction. Therefore, most of the degradation of bacterial PE to FFA and LPE observed in the usual immune bactericidal reaction (Inoue et al., 1974) must be the result of the action of bacterial phospholipase A which is activated or becomes accessible to its substrate on formation of lesions by complement. The mechanism of complement-mediated formation of membrane lesions is discussed on the basis of these results.

Carbon Radioisotopes↗