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Biomedical subjects

J Akatsuka

Publications and source records attributed to J Akatsuka.

At least 73 records · Page 4Linked to original sources
PubMed1983

[Laboratory and clinical studies on T-1982 (cefbuperazone) in the field of pediatrics].

T-1982 (cefbuperazone), a new 7 alpha-methoxycephem antibiotic, was fundamentally and clinically studied, and the following results were obtained. The antibacterial activities of T-1982 against clinical isolates of S. aureus, E. coli, K. pneumoniae, S. marcescens, P. mirabilis and P. aeruginosa were determined in comparison with those of CER, CEZ, CMZ and CTT. Against S. aureus, CER and CEZ exhibited excellent activity, whereas T-1982 was less active with the peak MIC of 12.5 micrograms/ml even with the inoculum size of 10(6) cells/ml. The activity of T-1982 was equal to that of CTT and by far superior to that of CER, CEZ and CMZ against E. coli, K. pneumoniae and P. mirabilis, the peak MICs with the inoculum size of 10(6) cells/ml being less than or equal to 0.1-0.2 microgram/ml, less than or equal to 0.1-0.2 microgram/ml and 0.2-0.39 microgram/ml, respectively. Against S. marcescens, T-1982 was superior to CMZ and CTT and 48% of the strains were inhibited by 3.13 micrograms/ml or less, whereas all the strains were resistant to CER and CEZ. The MIC of T-1982 against most strains of P. aeruginosa was more than 100 micrograms/ml. 10 mg/kg or 20 mg/kg of T-1982 was administered by one shot intravenous injection or 1 hour drip infusion to 23 pediatric patients to measure serum levels and urinary recovery. At 30 minutes after one shot injection of 10 mg/kg and 20 mg/kg, the highest serum levels of 22.0-38.8 micrograms/ml and 52.4-80 micrograms/ml were observed, the half-lives being 1.32 hours and 1.76 hours. When given by 1 hour drip infusion, the serum levels attained the peaks of 29.2-42.6 micrograms/ml and 49.0-75.6 micrograms/ml at the end of infusion, the half-lives being 1.24 hours and 1.19 hours. The urinary recovery rates within 6 hours were 74.2-92.5% and 50.2-66.5% by one shot injection and 63.4-84.2% and 53.9-79.0% by drip infusion. T-1982 was administered at a dose of 50 mg/kg by 30 minutes drip infusion to a child with purulent meningitis. The levels of T-1982 in the cerebrospinal fluid at 1 hour after administration were 4.8-6.7 micrograms/ml with the CSF/serum ratios of 4.4-8.4%. A total of 36 pediatric patients (21 cases of respiratory tract infection, 9 cases of urinary tract infection and each 1 case of purulent cervical lymphadenitis, scarlet fever, purulent meningitis, acute colitis, peritonitis and sinusitis) was treated with 40-80 mg/kg/day of T-1982 (252.6 mg/kg/day in purulent meningitis). The response was excellent in 27 patients and good in 7 patients, the efficacy rate being 94.4%. Diarrhea or eruption were observed in each 1 case. No abnormal laboratory findings were noted in any cases.

Adolescent↗
PubMed1983

Characterization of glycosphingolipids from cells of various types of human leukemia: occurrence of two glycosphingolipids, one reacting with anti-asialo GM1 antibody and one with anti-Forssman antibody.

Glycosphingolipids of neutrophils, lymphocytes and leukocytes from patients with various types of human leukemia [acute lymphoblastic (ALL), acute unclassified type (AUL), acute myeloblastic (AML), acute monocytic (AMoL), chronic myeloblastic (CML)] and the hypereosinophilic syndrome (HES) were analyzed chemically and immunochemically. No distinct difference was found in the molar ratio of lipid-bound sialic acid to lipid-bound phosphorus in these cells, but a low ratio of cholesterol to lipid-bound phosphorus was found in ALL (3 of 4 cases), AML, CML and AMoL (one of 2 cases). The predominant glycosphingolipid was ceramide dihexoside (CDH) in all cells analyzed, but the amount and the molar ratio of lipid-bound phosphorus to CDH were clearly different in different cell types, indicating that the molar ratio is a useful criterion in the classification of types of leukemia. In addition, molecular diversity of minor glycosphingolipid components was observed in various leukemic cells. Two of the neutral glycosphingolipids in AMoL were tentatively identified as asialo GM1 and Forssman glycolipids by comparing their mobilities on thin-layer chromatography with those of standard glycolipids and by observing the formation of precipitin lines on a double diffusion agar plate with anti-asialo GM1 and anti-Forssman antibodies.

G(M1) Ganglioside↗
PubMed1981

Use of cultured lymphoblastoid cells for the study of abnormal enzymes: molecular abnormality of a phosphoglycerate kinase variant associated with hemolytic anemia.

A phosphoglycerate kinase (PGKase: ATP:3-phosphoglycerate 1-phosphotransferase, EC 2.7.2.3; X chromosome-linked) variant, PGKase-Tokyo, is associated with enzyme deficiency, nonspherocytic hemolytic anemia, and neurological disturbances. Because a sufficient amount of the patient's erythrocytes was not available, the variant enzyme was purified to homogeneity from the cultured lymphoblastoid cells of the patient. The enzyme activity of the variant lymphoblastoid cells was about 16% of that of the normal lymphoblastoid cells. PGKase-Tokyo, compared to the normal enzyme, had a lower specific activity (31% of normal in the backward reaction and 15% of normal in the forward reaction), higher than normal Michaelis constants for ATP and 3-phosphoglycerate, a more acidic pH optimum, and increased thermal instability. Microscale peptide mapping analysis revealed that the structural abnormality of PGKase-Tokyo is a single amino acid substitution from valine to methionine at position 266. Thus, the use of the cultured lymphoblastoid cells is proven to be useful for the study of structural and functional abnormalities of mutant enzymes.

Amino Acids↗