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Biomedical subjects

M Katayama

Publications and source records attributed to M Katayama.

At least 307 records · Page 17Linked to original sources
PubMed1985

[Clinical studies of ceftizoxime suppositories in respiratory tract infections and urinary tract infections in children].

A fundamental and clinical study of ceftizoxime (CZX) suppositories was performed in pre-school and school-age children. The average time courses of CZX serum and urinary concentrations after administration of CZX suppository 250 mg (i.e. per kg body weight doses of 8.3-10.9 mg) to 4 school-age children were as follows. Serum concentrations: 6.1 micrograms/ml at 15 minutes, 6.3 micrograms/ml at 30 minutes, 3.8 micrograms/ml at 1 hour, 1.7 microgram/ml at 2 hours, 0.5 microgram/ml at 4 hours and 0.2 microgram/ml at 6 hours with a biological half-life of 1.43 hours. Urinary concentrations: 885 micrograms/ml for 0-2 hours, 209 micrograms/ml for 2-4 hours and 112 micrograms/ml for 4-6 hours with an average 6-hour urinary recovery rate of 25.6%. The clinical and biological effectiveness and adverse reactions were studied in 11 infants and school-age children afflicted with various infections (acute purulent tonsillitis, 1; acute bronchitis, 3; acute pneumonia, 4; and UTI, 3). The clinical responsiveness was "excellent" in 8, "good" in 2, and "failure" was recorded in 1, with an overall efficacy of 90.9% inclusive of "excellent" and "good". The microbiological effectiveness of CZX suppositories on presumed pathogenic organisms comprising 4 strains of H. influenzae, 1 strain of H. parainfluenzae, and 3 strains of E. coli was satisfactory, as evidenced by the substantially high eradication rate of 87.5%. The only organism that survived CZX suppository treatment was 1 strain of H. influenzae which however was greatly decreased. The only side effect was diarrhea in 1 patient, which however did not necessitate withdrawal of the drug. The only laboratory test abnormality was GOT and GPT elevation in 1 patient which was normalized within 8 days. In conclusion, CZX suppositories were found to be efficacious and safe for treatment of bacterial infections in children.

Bacteria↗
PubMed1985

[Fundamental and clinical studies on cefminox in the field of pediatrics].

A new antibiotic of cephamycin group, cefminox (CMNX, MT-141) was studied both fundamentally and clinically in the field of pediatrics. The minimum inhibitory concentrations (MIC) of CMNX for clinical isolates including 24 strains of S. aureus, 15 strains of S. pyogenes, 21 strains of H. influenzae, 24 strains of E. coli, 22 strains of K. pneumoniae and 22 strains of P. mirabilis were determined and compared to those of cefmetazole (CMZ), latamoxef (LMOX), cefotaxime (CTX), cefoperazone (CPZ) and cefazolin (CEZ). The MIC80 (80% MIC) values of CMNX for H. influenzae, E. coli, K. pneumoniae and P. mirabilis were 1.56, 1.56, 0.39 and 1.56 micrograms/ml, respectively. When compared to antibacterial activities of the control drugs, the activity of CMNX was inferior to those of CTX and LMOX but superior to those of CMZ and CEZ. On the other hand, MIC80 values of CMNX for S. pyogenes and S. aureus were 6.25 and 12.5 micrograms/ml, the activities being inferior to all of CMZ, CTX, LMOX, CPZ and CEZ used as the control drugs. In 3 pediatric patients of 9 to 12 years old, 20 mg/kg of CMNX was given intravenously as one shot and serum and urinary concentrations were determined. The mean serum concentrations in these 3 cases were 124 micrograms/ml, 102 micrograms/ml, 74.0 micrograms/ml, 47.9 micrograms/ml, 20.4 micrograms/ml, 9.2 micrograms/ml and 4.3 micrograms/ml at 1/4, 1/2, 1, 2, 4, 6 and 8 hours, respectively, with a half-life of 1.83 hours. The mean urinary concentrations were 1,968 micrograms/ml at 0 approximately 2 hours, 1,205 micrograms/ml at 2 approximately 4 hours, 761 micrograms/ml at 4 approximately 6 hours and 409 micrograms/ml at 6 approximately 8 hours, with 65.4% of the drug dosed recovered from the urine within the first 8 hours on an average. CMNX was used in the treatment of 22 clinical cases including 3 cases of acute purulent tonsillitis, 3 cases of acute bronchitis, 9 cases of acute pneumonia, 5 cases of acute pyelonephritis and 2 cases of acute enteritis. Clinical results in 20 cases excluded of 2 cases of Mycoplasma pneumonia were rated as excellent in 19 cases and as good in 1 case, with an efficacy rate being 100% taking excellent and good cases as effective cases. Bacteriological results for 5 strains of H. influenzae, 1 strain of H. parainfluenzae, 5 strains of E. coli, 2 strains of K. oxytoca and 1 strain of S. pneumoniae revealed that disappearance was obtained for all strains but 1 strain of P. aeruginosa which persisted.(ABSTRACT TRUNCATED AT 400 WORDS)

Anti-Bacterial Agents↗
PubMed1985

Recombinant gamma-interferon and lipopolysaccharide enhance 1,25-dihydroxyvitamin D3-induced cell differentiation in human promyelocytic leukemia (HL-60) cells.

The induction of cell differentiation by a combination of 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3], recombinant gamma-interferon (rec gamma-IFN), and a lipopolysaccharide from E. coli (LPS) was studied in a clonal population (clone-9) of human promyelocytic HL-60 leukemia cells in vitro. Treatment of clone-9 cells with 10(-9) to 10(-7)M 1,25-(OH)2D3 yielded a macrophage cell differentiation. The addition of 10 or 100 U/ml of gamma-IFN and 2 or 10 micrograms/ml LPS caused a further increase in expression of the different differentiation markers. The most pronounced effects involved increases in cell attachment to the surface of tissue-culture Petri dishes and in lysozyme, nonspecific esterase, and cytolytic activities. The combined treatment with 1,25-(OH)2D3 and rec gamma-IFN and LPS also caused an increase in the percent of multinucleated giant cells. These results indicate the effectiveness of combining different agents in inducing cell differentiation in HL-60 cells. A similar approach may be useful in controlling myeloid leukemias in vivo.

24,25-Dihydroxyvitamin D 3↗
PubMed1985

[Results of the surgical treatment of metastatic brain tumors].

Results of surgical treatment in 85 cases with metastatic brain tumors are reviewed. The lung was the most frequent site of primary lesion and the following sites were GI tract and the breast. Adequate treatment consisted of total removal of tumor, irradiation and/or chemotherapy were carried out in 51 cases. The remaining 34 cases had an unsuccessful treatment because of their poor physical condition. Mean survival time after adequate treatment was 8.75 months in the former group and 3.06 months in the latter group. Of 51 patients (86.3%) in the former group, 44 showed improvement of the neurological signs after treatment. In the latter group, only 14 patients (41.2%) revealed neurological improvement. Total removal of tumor was carried out in 55 of 85 cases. The one-month operative mortality for all patients was 19.2%. Postoperative one-year survival rate was 12.5% in 16 cases with multiple metastases and in 36 cases with single metastasis was 25.6%. Follow-up study of 77 cases showed 31.2% of survival rate in 6 months, 18.2% in one-year and 5.2% in two-years. Only four patients survived more than 3 years after treatment. The direct causes of death in cases of total removal were attributed in recurrence of primary lesion or remote metastases to other organs. This study revealed that the prognosis of the patient with metastatic brain tumor was influenced by existence of intracranial hypertension due to brain edema or metastatic tumor itself and metastases to other organs.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1985

[Fundamental and clinical studies on aztreonam in the pediatric field].

Fundamental and clinical studies on aztreonam (AZT), a new monobactam antibiotic, were performed in the pediatric field. The MICs of AZT were assessed against the clinically isolated strains in the pediatric infections. AZT showed an excellent antibacterial activity against Gram-negative bacteria, i.e., against E. coli (20 strains), K. pneumoniae (9), P. mirabilis (16), P. vulgaris (5), P. aeruginosa (10), S. typhimurium (4) and H. influenzae (11); the MICs of AZT against the above strains were less than 0.39 microgram/ml, 0.10 microgram/ml, 0.024 microgram/ml, 0.024 microgram/ml, 6.25 micrograms/ml, 0.10 microgram/ml and 0.10 microgram/ml, respectively. However, antibacterial activity of AZT against Gram-positive bacteria was inferior to that against Gram-negative bacteria, i.e., against the strains of S. aureus (16) and S. pyogenes (4), those MICs were more than 400 micrograms/ml and 3.13 micrograms/ml, respectively. Serum concentrations and urinary excretion of AZT were measured in 2 children aged 7 and 11 years after a single intravenous injection at the dose of 20 mg/kg. The mean serum concentration of AZT followed by the injection 62.5 micrograms/ml at 1/4 hour, 28.5 micrograms/ml at 1/2 hour, 16.5 micrograms/ml at 1 hour, 12.0 micrograms/ml at 2 hours, 3.6 micrograms/ml at 4 hours and 1.1 micrograms/ml at 6 hours, respectively. The mean half-life (beta-phase) was 1.24 hours. The mean urinary concentrations after the injection were 5,000 micrograms/ml in 0-2 hours, 1,650 micrograms/ml in 2-4 hours and 611 micrograms/ml in 4-6 hours and the mean urinary recovery rate up to 6 hours was 61.2%. These results in our studies were considered to be comparable with those reported in adults. In our clinical studies, AZT was administered to a total of 14 cases, i.e., acute pneumonia (4 cases), acute pyelonephritis (4), acute enteritis (5) and acute sppurative cholangitis (1). Clinical effect of AZT was excellent or good in 13 cases except fair in 1 case with acute enteritis and the efficacy rate (excellent and good) was 92.9%. With regard to bacteriological effect, all the strains of H. influenzae (3), E. coli (2), P. mirabilis (1) and P. vulgaris (1) were eradicated, but, S. typhimurium (4) was not eradicated. Neither side effect nor abnormal laboratory findings were observed during the study.

Age Factors↗
PubMed1984

Properties of monoamine oxidase in monkey heart.

The activities of monoamine oxidase (MAO) in a homogenate and the mitochondrial fraction of monkey (Macaca fascicularis) heart were measured with labelled benzylamine, serotonin (5-HT), tyramine and beta-phenylethylamine (PEA) as substrates. The effects of clorgyline, deprenyl and semicarbazide on MAO were also investigated. Benzylamine deamination was more sensitive to deprenyl than to clorgyline, although it was not completely inhibited by a high concentration of either, and the remaining activity was completely inhibited by pretreatment with semicarbazide. The activities of 5-HT and tyramine were both more sensitive to clorgyline than to deprenyl, and both inhibitors gave single-sigmoidal inhibition curves. Experiments with increasing concentrations of PEA as substrate and clorgyline and deprenyl as inhibitors indicated that at higher concentrations, PEA was a substrate for MAO-A as well as MAO-B in monkey heart. These results suggest that monkey heart mitochondria contain not only MAO-A and MAO-B, but also clorgyline resistant amine oxidase (CRAO). The ratio of MAO-A, MAO-B and CRAO was determined from plots of inhibitions with each substrate. The kinetic constants of MAO in monkey heart were compared with those of MAO in hearts of other animals. The enzymic properties of MAO in monkey heart were discussed on the basis of these results.

Animals↗
PubMed1984

Primary culture of human esophageal epithelial cells.

Primary cultures and serial passages of nontumorous adult human esophageal epithelial cells derived from surgically resected esophagi of patients with esophageal cancer have been developed. Disaggregated cells obtained by means of tryptic digestion lasting for 90 min grew to confluency in medium RITC 80-7 supplemented with 10% fetal bovine serum (FBS). Such primary cultures were established from more than 20 donors, and could be passaged 3 to 5 times. Fibroblastic contamination was almost eliminated by careful sampling, and it was possible to perform the growth response or serial passages without fibroblastic overgrowth. Serum-free medium RITC 80-7 supplemented with fibronectin (FN) and bovine serum albumin (BSA) also supported the growth of esophageal epithelial cells, but was not sufficient for serial passages. Among growth promoting factors in medium RITC 80-7, the epidermal growth factor (EGF) was highly stimulatory to growth. Insulin, transferrin, FN and BSA also enhanced cell growth and/or attachment. The epithelial nature of the cultured cells was confirmed by transmission electron microscopy and indirect immunofluorescent staining with antikeratin antibody. The majority of the cultured cells were diploid.

Adult↗
PubMed1984

[Studies on sulbactam/cefoperazone in the field of pediatrics].

Microbiological, pharmacokinetic and clinical studies on sulbactam/cefoperazone (SBT/CPZ) were carried out in the field of pediatrics. Antimicrobial activity The MIC80 of SBT/CPZ was 6.25 micrograms/ml for clinically isolated 24 strains of S. aureus (24 beta-lactamase producing strains), 0.39 micrograms/ml for 17 strains of S. pyogenes, 3.13 micrograms/ml for 24 strains of E. coli (22 beta-lactamase producing strains), 3.13 micrograms/ml for 22 strains of K. pneumoniae (22 beta-lactamase producing strains), 1.56 micrograms/ml for 22 strains of P. mirabilis and 0.20 microgram/ml for 15 strains of H. influenzae (13 beta-lactamase producing strains). In comparison with CPZ in respect to the MIC, SBT/CPZ exhibited synergistic effect on 31 strains out of 81 beta-lactamase producing strains (included 6 strains of S. aureus, 9 of E. coli, 5 of K. pneumoniae and 11 of H. influenzae) which was scarcely observed against 43 non-beta-lactamase producing strains. Absorption and excretion Serum levels and urinary excretion of SBT/CPZ were studied in 7 children aged 5 to 12 years. The mean serum concentration of SBT at 15 minutes following a single intravenous injection of 10 mg/kg of SBT/CPZ was 14.2 micrograms/ml and that of CPZ was 30.4 micrograms/ml. The mean urinary recovery rates at 6 hours following the intravenous injection were 57.8% and 18.3%, respectively. The mean serum concentrations of SBT and CPZ after 1-hour infusion of 10 mg/kg of SBT/CPZ were 10.9 micrograms/ml and 17.6 micrograms/ml, respectively. The urinary recovery rates of SBT and CPZ at 7 hours after the infusion were 100.0% and 27.7% on average, respectively. The mean serum levels of SBT and CPZ at 15 minutes after a single intravenous injection of 20 mg/kg of SBT/CPZ were 25.6 micrograms/ml and 66.0 micrograms/ml, respectively and urinary elimination until up to 6 hours were 72.5% on average for SBT and 21.1% for CPZ. Clinical study SBT/CPZ was used for the treatment of a total of 20 pediatric patients aged 1 month to 14 years to evaluate its clinical effectiveness, bacteriological efficacy and adverse effects. The clinical efficacy in 6 patients with acute pneumonia, 3 with staphylococcal scalded skin syndrome, 2 each with acute purulent tonsillitis and acute pyelonephritis, 1 each with acute purulent lymphadenitis, acute sinusitis, acute bronchitis, peritonitis and acute enteritis was judged to be excellent in 15 cases and good in 3 cases with an efficacy ratio of 100%. The clinical efficacy in 6 patients whose infections were caused by beta-lactamase producing strains was judged to be excellent in all the cases.(ABSTRACT TRUNCATED AT 400 WORDS)

Acute Disease↗
PubMed1984

[Fundamental and clinical evaluation of ceftriaxone in the pediatric field].

Fundamental and clinical evaluation of ceftriaxone (Ro 13-9904, CTRX) was performed in the pediatric field. Antibacterial activity The MIC80 of CTRX against clinical isolates such as S. aureus (23 strains), S. pyogenes (23 strains), E. coli (20 strains), K. pneumoniae (23 strains), H. influenzae (15 strains) and P. aeruginosa (23 strains) were 6.25 micrograms/ml, 0.024 microgram/ml, 0.20 microgram/ml, 0.05 microgram/ml, less than or equal to 0.006 microgram/ml and 12.5 micrograms/ml, respectively. The antibacterial activity of CTRX was therefore poor against S. aureus and P. aeruginosa, but quite excellent against S. pyogenes, E. coli, K. pneumoniae and H. influenzae. Compared with cefotaxime (CTX), cefoperazone (CPZ), cefmetazole (CMZ), cefazolin (CEZ) and ceftazidime (CAZ), CTRX was the highest in the antibacterial activity against H. influenzae, next to CTX against S. pyogenes, E. coli and K. pneumoniae, similar to CTX, CPZ and CAZ against S. aureus and similar to CTX against P. aeruginosa. Absorption, Excretion The mean serum levels of CTRX after an intravenous one shot injection with about 20 mg/kg in 3 children aged 10 to 14 years were 160.0 +/- 23.3 micrograms/ml after 1/4 hour, 134.3 +/- 27.5 micrograms/ml after 1/2 hour, 115.0 +/- 33.2 micrograms/ml after 1 hour, 95.3 +/- 28.4 micrograms/ml after 2 hours, 75.3 +/- 14.5 micrograms/ml after 4 hours, 30.3 +/- 13.5 micrograms/ml after 12 hours and 8.2 +/- 3.1 micrograms/ml after 24 hours, while the half-life time was 5.92 +/- 0.43 hours on the average. The mean urinary levels were 1,060 +/- 461 micrograms/ml from 0 to 2 hours, 309 +/- 122 micrograms/ml from 2 to 4 hours, 375 +/- 83 micrograms/ml from 4 to 6 hours, 237 +/- 77 micrograms/ml from 6 to 12 hours and 122 +/- 23 micrograms/ml from 12 to 24 hours, the mean urinary recovery rate up to 24 hours being 38.9 +/- 13.6%. The concentration in the cerebrospinal fluid The mean levels of CTRX in the cerebrospinal fluid of the patients with purulent meningitis were 4.30 +/- 4.22 micrograms/ml 1 hour after an intravenous one shot injection with 42 to 51 mg/kg, 4.64 +/- 3.53 micrograms/ml after 3 1/2 hours to 6 hours, 3.79 +/- 2.15 micrograms/ml after 7 1/2 hours to 12 hours and 1.79 +/- 0.23 microgram/ml after 19 hours.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1983

Adrenoleukodystrophy: detection of increased very long chain fatty acids by high-performance liquid chromatography.

Using high-performance liquid chromatography, adrenoleukodystrophy (ALD) and adrenomyeloneuropathy (AMN) were diagnosed by the analysis of fatty acids in sphingomyelin. The analytical method was simple, sensitive and accurate. In ALD and AMN patients, very long chain fatty acids (C26:0, C25:0 and C24:0 on the base of C22:0) were elevated not only in plasma and erythrocyte membranes but also in whole blood samples. An increase of long chain fatty acids was also shown in sphingomyelin of cultured skin fibroblasts. One heterozygote for ALD showed intermediate values between homozygotes and controls. Thus, high-performance liquid chromatography is a valuable method to detect increased long chain fatty acids for the diagnosis of ALD or AMN.

Adult↗