Search PubMed⌕ Search

Biomedical subjects

H Kanno

Publications and source records attributed to H Kanno.

At least 199 records · Page 11Linked to original sources
PubMed1991

Genomic structure and expression of human guanosine monophosphate reductase.

In vitro translation in the rabbit reticulocyte system and transient expression in Cos7 cells were performed to characterize the protein encoded by a chromosome 6-linked human cDNA clone, whose nucleotide sequence is homologous to that of Escherichia coli guanosine monophosphate reductase (GMP reductase) cDNA. The molecular weight of the peptide produced by the cDNA was about 37,000 Dalton, and the protein produced in the Cos7 cells exhibited GMP reductase activity, substantiating that the cDNA is for human GMP reductase. The corresponding genomic clones were obtained from two human genomic libraries. The gene spans about 50 kb and is composed of 9 exons, which encode 345 amino acid residues. Organization of exons and introns was established by DNA sequencing of each exon and splicing junctions. The gene contains two potential SpI binding sites within exon 1, and a functional atypical polyadenylation signal in exon 9.

Base Sequence↗
PubMed1991

Identification of common variant alleles of the human guanosine monophosphate reductase gene.

Examination of nucleotide sequences of genomic DNA samples obtained from several unrelated Caucasians and orientals revealed the existence of four variant alleles in the chromosome 6-linked quanosine monophosphate reductase locus. The wild-type gene has T at position 42 (counting from A of the chain initiation codon), C at 630, G at 700, and T at 766, i.e., its structure is T(42)-C(630)-G(700)-T(766). The variant gene, T-T-G-T, was found in about 10% of the loci examined. The C-to-T change at 630 was silent and did not induce any amino acid substitution (His at amino acid residue 210), but it created an additional NcoI cleavage site in the variant gene. The frequency of another variant, the T-C-G-A gene, was about 30%. The T-to-A change at 766 caused an amino acid substitution Phe----Ile at amino acid residue 256 in the variant protein. Frequencies of the C-C-G-T variant and the T-C-A-T variant were probably lower than 5% in Caucasians and orientals.

Alleles↗
PubMed1991

High-dose-rate intraluminal brachytherapy for bile duct carcinoma after surgery.

Five patients with recurrent or residual bile duct carcinoma after surgery were treated with high-dose-rate intraluminal brachytherapy (HDRIBT) using a remote afterloader. External radiotherapy was also given in three cases. HDRIBT is considered to be an effective mode of radiotherapy for residual or recurrent bile duct tumors.

Bile Duct Neoplasms↗
PubMed1991

Aryloxyacetic acid diuretics with uricosuric activity. II. Substituted [(4-oxo-4H-1-benzopyran-7-yl)oxy]acetic acids and the related compounds.

Di- and tri-substituted [(4-oxo-4H-1-benzopyran-7-yl)oxy]acetic acids, and 4-oxo-3-phenyl-4H-furo[2,3-h]-[1]benzopyran-8-carboxylic acid were synthesized and tested for natriuretic and uricosuric activities. Among the compounds tested, 3,5-disubstituted [(4-oxo-4H-1-benzopyran-7-yl)oxy]acetic acids (6c-f, h, n and x) showed potent natriuretic and uricosuric activities, whereas 4-oxo-3-phenyl-4H-furo[2,3-h][1]benzopyran-8-carboxylic acid (6dd) possessed only potent natriuretic activity. The structure-activity relationships are also discussed.

Benzopyrans↗
PubMed1991

[Study of satellite tumor nodules in renal cell carcinoma].

Topography and histological types of main tumor and satellite tumor nodules (STN) were investigated on 60 cases of renal cell carcinoma by gross and microscopic study by making whole area histological sections. 30-100 histological slides were made from the median sagittal section and multiple horizontal sections of renal cell carcinoma. STN were observed in 28 cases of the 60 cases (46.7%) and could be classified into 3 types according to their location relative to the main tumor. STN could not be observed in some cases despite the large main tumor of 10 cm or more, while STN were observed in some cases with the main tumor of only 2.5 cm or less. High grade and high stage cases showed a high incidence of STN. It is considered that, only in cases, with the tumors of low grade, low stage and has only 1 STN or less, conservative surgery on renal parenchyma is possible. When the case is of low grade and low stage and has a possibility of preserving normal renal parenchyma, conservative surgery on renal parenchyma may be justified even if the tumor is large.

Carcinoma, Renal Cell↗
PubMed1991

Mechanisms of molecular recognition of tRNAs by aminoacyl-tRNA synthetases.

Interactions of Escherichia coli isoleucyl- and glutamyl-tRNA synthetases and their cognate tRNAs were analyzed by phosphate-alkylation mapping with N-nitroso-N-ethylurea and/or by 1H-NMR analysis. When E. coli tRNA(Ile) was bound with isoleucyl-tRNA synthetase, many of the phosphate groups in the anticodon loop and stem and in the D-stem were protected from alkylation. This result is consistent with that of analysis of imino proton resonances due to the secondary and tertiary base pairs. These analyses also suggested that the L-shaped tertiary structure of tRNA(Ile) is distorted upon complex formation with IleRS because of disruption of some tertiary base pairs. In the case of E. coli tRNA(Glu), several phosphate groups in the D-stem and the variable loop were significantly protected by the cognate synthetase. These results indicate that the two tRNAs, unlike other tRNAs studied so far, have some of the "identity determinants" in the D-stem and/or in the anticodon stem.

Alkylation↗
PubMed1991

[Traumatic carotid-cavernous fistula presenting subarachnoid hemorrhage 5 years after head injury; case report].

A case of traumatic carotid-cavernous fistula (CCF) which presented subarachnoid hemorrhage long after the injury is reported. A 24-year-old male was admitted to the National Yokohama Hospital with complaints of severe headache and nausea. CT scan and cerebral angiography showed subarachnoid hemorrhage due to ruptured CCF. His right visual acuity has disappeared after a traffic accident 5 years before, and he had hit his forehead again 3 years previously. He experienced severe headache twice for 2 weeks after his admission. He was transferred to Kanagawa Rehabilitation Center to be treated with intravascular surgery. Plain CT showed high density areas in the basal cisterns. CT after contrast infusion disclosed a small enlarged high density area in the right cavernous sinus, and showed an enhanced mass lesion in contact with the right ventrolateral side of the midpons. The right internal carotid angiogram showed high flow CCF, fed only by the internal carotid artery. It drained mainly into the basilar plexus, partially into the basal vein of Rosenthal and the inferior petrosal sinus. The CCF was found at the C4 portion of the right internal carotid artery. CT and the angiogram revealed a part of the CCF developing into a varix in the ventral side of the prepontine cistern. It ruptured and the patient developed subarachnoid hemorrhage 5 years after the head injury. The CCF was intravascularly embolized by a detachable balloon. Early treatment for CCF is necessary to prevent the occurrence of subarachnoid hemorrhage if a part of the CCF develops into a varix.

Adult↗
PubMed1991

[The changes in infectious diseases and the future of microbiological examination].

Infectious diseases have changed markedly, especially in the background of patients and causative organism. The incidence of immunocompromised hosts has increased in hospitals due to the advances in medical treatment and less virulent organisms now caused infection. The causative organism is very difficult to determine by the conventional microbiological examinations such as culture method. Many new microbiological techniques have been introduced to obtain more accurate results more rapidly. These new methods are mainly immunological and genetical techniques. But these new techniques could not obtain extensive information than culture method, so it is necessary to choose most suitable method for the characteristic of the infectious disease.

Communicable Diseases↗
PubMed1990

Recognition of tRNA identity determinants by aminoacyl-tRNA synthetases.

By analyzing aminoacylation activities of variants of isoleucine tRNAs and glutamic acid tRNA from Escherichia coli, it was found that the anticodons are the major determinants for "identities" of these tRNAs. It was also shown that the post-transcriptional modifications are essential to aminoacylation of these tRNAs. Interactions between the tRNAs and the aminoacyl-tRNA synthetases were analyzed by NMR spectroscopy.

Amino Acyl-tRNA Synthetases↗
PubMed1990

[Clinical evaluation of therapy for aspiration pneumonia with imipenem/cilastatin sodium].

In an open, prospective, multicenter trial the clinical efficacy of imipenem/cilastatin sodium (IPM/CS) for the treatment of 14 cases with aspiration pneumonia was investigated. The mean age was 75.4 years old. Diseases of central nervous system were present in 11 cases, cardiovascular diseases, pulmonary diseases and diabetes mellitus in 2 cases each respectively. Seven cases were community-acquired and another seven were hospital-acquired. Six cases were moderate and 8 cases were severe. Causative organisms were determined in 9 cases (64.3%), multiple causative organisms were isolated in 3 cases. Isolated organisms were Staphylococcus aureus (4), Pseudomonas aeruginosa (3), Klebsiella pneumoniae (3), Escherichia coli (1), Acinetobacter calcoaceticus (1). Detection of anaerobes was not attempted. Clinical effects of IPM/CS were excellent in 3, good in 8, fair in 2, poor in 1, the efficacy rate was thus 78.6%. P. aeruginosa was isolated from 2 out of 3 cases in which therapy with IPM/CS failed. Monotherapy with IPM/CS appears to be highly effective for cases of aspiration pneumonia, but the disease due to IPM-resistant P. aeruginosa is an exception.

Aged↗
PubMed1990

[Aging in the human tongue from autopsies. Histometrical study. 1. Degree of stenosis of lingual arteries].

Tongues from 119 autopsies were fixed in 20% neutral formalin. The transversely cut segments from the middle parts of the tongues were embedded in paraffin. Histologic sections of 5 microns thickness were prepared. Lingual tissue were examined histologically. Specimens were stained by hematoxylin-eosin, elastica van Gieson, and Azan-Mallory stainings. The stenotic index of human lingual arteries (area of lumen/area of intima and lumen of lingual artery x 100) (S.I) was calculated on the elastica van Gieson-stained slides by using an image analyzer system (Pias, LA555N). The results were as follows: 1. The lingual arteries, showed rupture and multilamellation of lamina elastica interna, as well as proliferation of intimal elastic fiber in almost all cases. 2. A decrease in the S.I was indicated in the lingual arteries with the progress of aging. 3. Calcification was observed at the intima and media of lingual arteries in a small number of cases (5 cases). These findings indicated that histological changes due to arteriosclerosis of lingual arteries was intimal thickening and lipid deposion; atherosclerotic changes was not observed.

Adult↗
PubMed1990

Recognition of N-glycosidic carbohydrates on esophageal carcinoma cells by macrophage cell line THP-1.

Cell-to-cell contact between macrophages and tumor cells is an important initial reaction in a host defense mechanism against tumor cells. The authors have studied cell surface components of human esophageal carcinoma cells recognized by macrophages. Superoxide release from THP-1 cells, a human macrophage cell line, was analyzed in their interaction with a battery of human squamous cell carcinoma cell lines (TE) originated from esophageal cancer patients. The macrophage-triggering ability of TE 1 cell line, a high stimulant, was reduced after treatment with trypsin or tunicamycin, an inhibitor of N-glycosidic glycosylation. Addition of monosaccharides was efficient in competitive inhibition of these cellular interaction. Moreover, con-A-resistant mutation of TE 1 cells was found to reduce their macrophage-triggering ability, associated with increase of L-PHA-binding capacity, suggesting substitution to the GlcNAc beta(1----6)-linked lactosamine antenna in N-glycosidic carbohydrates. These findings suggest that terminal residues of N-glycosidic carbohydrates on some esophageal carcinoma cells may contribute to the recognition sites of macrophages.

Carcinoma, Squamous Cell↗
PubMed1990

[Clinical evaluation of cefteram pivoxil in respiratory tract infections].

The usefulness of cefteram pivoxil (CFTM-PI) was evaluated in 99 cases with respiratory tract infections: 32 cases with acute bronchitis, 51 cases with infectious exacerbations of chronic respiratory diseases and 16 cases with pneumonia. 1. The clinical efficacies included marked improvement in 27 cases, improvement in 51 cases, moderate improvement in 9 cases, no change in 10 cases and deterioration in 2 cases. The improvement rate was 78.8%. 2. Overall effects were excellent in 12 cases, good in 9 cases and fair in 5 cases. There was no case in which efficacy was not observed and the efficacy rate was 80.8%. 3. Bacteriological effects were classified according to the causative organisms. Eradication rate was 80.8% (21 of 26 strains), indicating an excellent antibacterial action of CFTM-PI. In particular, MICs of cefteram were below 0.05 microgram/ml against all 10 strains of Haemophilus influenzae regardless of beta-lactamase production even with an inoculum of 10(8) or 10(6) cells/ml. 4. Side effects rarely occurred and included a slight gastrointestinal irritation in 4 of 99 cases (4%). Two cases which had abnormal elevations of GOT and GPT had abnormal values prior to administration of CFTM-PI. The elevations were slight and it was possible to continue administration. The GOT and GPT values were improved after the end of administration. The above results indicate the usefulness of CFTM-PI in acute respiratory infections and infectious exacerbation of chronic respiratory diseases.

Adult↗
PubMed1990

[The problems of the report in microbiological examination--ideological and technological aspects].

In the report of microbiological examination, clinicians are required to differentiate infectious diseases from other diseases, to determine the causative organism, and to select suitable antimicrobial agents for chemotherapy. To obtain accurate results, good material must be collected and suitable methods applied. In the microbiological field, rapid diagnosis is very important. New immunological and genetical new methods are being used, to obtain earlier laboratory results and these methods will be commonly used in the not-too-distant future. On the other hand, recently opportunistic infections have increased in hospital. The causative organism and the clinical role of such isolates are very difficult to determine. Such information as the underlying disease, number of leucocytes, and premedication, of the patients must be studied carefully. In future, the laboratory should play the role of the information center for infectious diseases and chemotherapy, but there are very few medical specialists in this field in Japan, which makes it very hard to establish these systems in many hospitals.

Humans↗