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Biomedical subjects

K Miyata

Publications and source records attributed to K Miyata.

At least 379 records · Page 21Linked to original sources
PubMed1984

Serratia protease. Amino acid sequences of both termini, the 53 residues in the middle region containing the sole methionine residue, and a probable zinc-binding region.

Reexamination of the molecular mass and the amino acid composition of Serratia protease revealed the presence of 1 mol of methionine per mol of protein (about 46K daltons), and this was confirmed by BrCN cleavage followed by separation of the two fragments. The sole methionine residue was located near the middle region of the molecule. The amino(N)-terminal sequence was determined by Edman degradation of the protein and studies of several proteolytic peptides, establishing a sequence of 18 residues with a heterogeneous N-terminus. The carboxyl(C)-terminal sequence was determined by carboxypeptidase A digestion and tritium-labeling of the citraconylated C-terminal half segment to be -Phe-Ile-Val. The sequences of a total of 53 residues containing the methionine residue and a total of 38 residues containing two histidine residues were established by the application of various conventional methods to a BrCN peptide and several proteolytic peptides. The segment containing the histidine residues was homologous with that containing the two histidine residues chelating the zinc atom of thermolysin. The 38-residue segment may be directly connected to the 53-residue segment.

Amino Acid Sequence↗
PubMed1984

Sex difference of N-Acetyl-beta-D-glucosaminidase activity in the kidney, urine, and plasma of mice.

N-Acetyl-beta-D-glucosaminidase (NAG) activities in urine, kidney, and plasma were compared in an age-matched group of male and female ds mice. In males, the NAG activity in the kidney was significantly higher (p less than 0.001), and the urinary NAG activity (unit/g creatinine) was 8-fold higher than those for females, while plasma NAG levels were significantly lower (p less than 0.001). These findings indicate that when using urinary NAG activity to detect drug nephrotoxicity in mice, the different basal levels between males and females should be considered before drug administration.

Acetylglucosaminidase↗
PubMed1984

Circulating immune complexes and granulocytes chemotaxis in Kawasaki disease.

Serum immunoglobulin levels, complement titers, circulating immune complex levels, and chemotaxis of granulocytes were evaluated in 32 patients with Kawasaki disease with or without coronary aneurysm. The group of patients with coronary aneurysm showed relatively higher levels of IgG. Regardless of the presence of coronary aneurysm, the level of IgE in the acute phase was higher than that in the convalescent phase. The level of immune complexes was higher in the group of patients with coronary aneurysm (p less than 0.05). There was a low negative correlation between immune complexes and CH50. The chemotaxis of the patients with coronary aneurysm was significantly impaired (p less than 0.01).

Aneurysm↗
PubMed1984

[Prostatic tissue and fluid levels of DL-8280].

The concentration of DL-8280, a new pyridone carboxylic acid, in the prostatic tissue and fluid after oral administration to man was studied. The drug was concentrated in the prostate and the concentration was dose-dependent. The ratios of prostatic tissue and fluid levels to serum levels were 1.62-1.79 and 1.65-1.96. respectively.

Administration, Oral↗
PubMed1983

Myocardial energy metabolism of congestive and hypertrophic cardiomyopathy in man.

A key enzyme of glycolysis (pyruvate kinase) and main enzymes of the electron transport system (NADH cytochrome c reductase, succinic cytochrome c reductase, and cytochrome c oxidase) were measured in left ventricular biopsy specimens from six hypertrophic (HCM) and six congestive (CCM) cardiomyopathy. Pyruvate kinase was 104.0 and 45.0 mU/mg protein in HCM and CCM, respectively. NADH cytochrome c reductase, succinic cytochrome c reductase, and cytochrome c oxidase were 146.0, 9.9, and 775.0 mU/mg protein in HCM and 87.4, 5.2, and 502.0 mU/mg protein in CCM, respectively. From these data, it is evident that glycolysis and enzyme activities of the electron transport system are increased in HCM and decreased in CCM. Cardiac function reflects the state of these energy metabolism pathways in the myocardium. The changing energy metabolism in the right ventricle of the emphysema hamster seems to support this concept.

Animals↗
PubMed1983

Vacuoles in macrophages and reticular cells of regional lymph nodes of the rat after injection of large doses of steroids.

The ultrastructure of macrophages and reticular cells of regional lymph nodes of the rat after administration of large doses of cortisone acetate, estrone, progesterone, and cholesterol in aqueous suspensions was investigated. A large number of vacuoles, most of which were surrounded by unit membrane, and lipid droplets not surrounded by unit membrane were observed in the cytoplasm of both macrophages and reticular cells. They were not seen in these cells of control animals and in experimental animals that had received smaller doses of these steroid hormones. After cholesterol injection, many lipid droplets were observed in the cytoplasm of macrophages. These observations suggest that steroids injected in suspension accumulate in macrophages and reticular cells of the regional lymph nodes. Electron-dense material was often present in vacuoles of macrophages but not in those of reticular cells.

Animals↗
PubMed1983

Effect of cinoxacin on cellular metabolism and p-aminohippurate transport in kidney cortical slices in terms of its nephrotoxic action.

Cinoxacin is a drug which, at very high doses, causes renal damage only in rats. This study compared the in vitro effects of cinoxacin and nalidixic acid on cellular metabolism and p-aminohippurate (PAH) transport in renal cortical slices. Cinoxacin had no effect on Na+ transport, ATP content, oxygen consumption, inulin space and tissue water content, in rat renal cortical slices in vitro, while nalidixic acid affected most of the parameters tested. PAH uptake by slices from rats pre-treated with a nephrotoxic dose of cinoxacin was decreased. This renal damage appeared to be due to physical trauma resulting from deposition of cinoxacin crystals in the urinary tract.

Aminohippuric Acids↗
PubMed1983

Difference in urinary N-acetyl-beta-D-glucosaminidase activity between male and female beagle dogs.

Urinary N-acetyl-beta-D-glucosaminidase (NAG) activity differed greatly between male and female beagle dogs in an age-matched group. The NAG activity in males per animal, per body weight, or per 16-hour urine sample was approximately double that in females and was 2.4-fold higher when the activity was considered relative to urinary creatinine. On the other hand, alanine aminopeptidase activity relative to urinary creatinine was not significantly different between males and females. These findings indicate that when using urinary NAG activity to detect drug nephrotoxicity in dogs, some consideration must be given to different control levels between males and females before starting drug administration.

Acetylglucosaminidase↗
PubMed1983

Characterization of cephalosporinases from Bacteroides fragilis, Bacteroides thetaiotaomicron and Bacteroides vulgatus.

The susceptibility of 80 Bacteroides fragilis group strains isolated from clinical specimens to beta-lactam antibiotics was investigated by agar dilution method. Twenty strains showed high resistance to the antibiotics. The resistance level of the isolates to cephaloridine was related to the amount of beta-lactamase activity (cephalosporinase; CSase) produced. B. fragilis GN-11477, B. thetaiotaomicron GN11478 and B. vulgatus GN11479 were selected from among the CSase producing strains, and the enzymes were purified about 300-fold by affinity chromatography employed ampicillin as ligand bound to activated CH Sepharose 4B. The enzyme preparations gave a single protein band on polyacrylamide gel electrophoresis. The molecular weights of the three enzymes were estimated to be approximately 32,000 and their isoelectric points were 5.2, 4.9 and 4.5, respectively. The optimal pH and the optimal temperature of the enzymes were 7.2 and 37 degrees C, respectively. The enzyme activities were inhibited by iodine, some divalent ions, p-chloromercuribenzoate, clavulanic acid, cephamycin derivatives and cloxacillin. The enzymes showed hydrolytic activity against cephaloridine, cephalothin, cefazolin, cefuroxime and also newly introduced cephalosporins such as cefotaxime, cefoperazone and cefmenoxime. Each mouse antisera obtained against the purified enzymes showed cross-reactions with its each enzyme and others in neutralization test.

Ampicillin↗