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Biomedical subjects

H Taguchi

Publications and source records attributed to H Taguchi.

At least 415 records · Page 23Linked to original sources
PubMed1987

[A case of interstitial cystitis that developed alternately with bronchial asthma].

The patient was a 46-year-old man. His chief complaints were urinary frequency and pain on urination. They first appeared one year earlier. The patient had had a history of bronchial asthma and urticaria. Vesical capacity decreased and vesico-cutaneous developed. The urine sediment contained eosinophils and vesico ureteral reflux was observed. The bladder tissues contained a moderate amount of eosinophils, lymphocytes and plasma cells. The total IgE was 360 IU/ml. The IgE RAST score and immediate reaction to the skin tests were all negative. The Arthus and delayed-type reaction skin tests were positive to various Eumycetees and foods. Provocation tests by eating foods such as eggs, meats, and shellfish reproduced the above-mentioned bladder disorders. The patient was therefore put on a diet that restricted the amount of animal protein consumed except for white meat fishes, and a mast cell membrane stabilizer was administered. The interstitial cystitis improved but the asthma aggravated. The cystitis was found to develop alternately with asthma.

Asthma↗
PubMed1987

[Malignant mesenchymoma of the mesocolon].

A rare case of malignant mesenchymoma in a 58-year-old woman is described. The tumor grew rapidly for a month and was located in the mesosigmoid. The resected tumor measured 25 X 20 X 20 cm and weighed 5,000 g. It metastasized into the great omentum within four months after operation. Histologically, this tumor was composed of undifferentiated sarcomatous elements, but in some parts revealed patterns of differentiation, including leiomyosarcoma, chondrosarcoma and osteosarcoma. In areas of osteosarcoma, the bone tissue varied from immature to mature. The histology of the recurrent tumors was similar to that of the first tumor. We considered that undifferentiated sarcomatous elements contained pluripotential cells which could differentiate multiple, mature malignant mesenchymes.

Female↗
PubMed1986

Effect of thrombomodulin on the kinetics of the interaction of thrombin with substrates and inhibitors.

Thrombomodulin decreased by 20-30% the Michaelis constant of two tripeptidyl p-nitroanilide substrates of thrombin. Thrombomodulin increased the rate of inactivation of thrombin by two peptidyl chloromethane inhibitors by a similar amount. This effect appeared to be due to a decrease in the dissociation constants of the inhibitors. An improved method for the separation of fibrinopeptides A and B by h.p.l.c. was developed, and this method was used to study the effect of thrombomodulin on the thrombin-catalysed cleavage of fibrinogen. In this reaction, thrombomodulin was a competitive inhibitor with respect to the A alpha-chain of fibrinogen. The release of fibrinopeptide B was also inhibited by thrombomodulin. Analysis of the inhibition caused by thrombomodulin with respect to fibrinopeptides A and B yielded the same dissociation constant for the thrombin-thrombomodulin complex. In the presence of thrombomodulin, the rate of inactivation of thrombin by antithrombin III was stimulated 4-fold. This stimulation showed saturation kinetics with respect to thrombomodulin. Thrombomodulin was found to compete with hirudin for a binding site on thrombin. As a result of this competition, hirudin became a slow-binding inhibitor of thrombin at high thrombomodulin concentrations. Estimates of the dissociation constant for thrombomodulin were obtained in several of the above experiments, and the weighted mean value was 0.7 nM.

Amino Acid Chloromethyl Ketones↗
PubMed1986

Catalytic function of a tyrosyl residue in tryptophanase.

Tryptophanase has an essential tyrosyl residue/active site which can be modified by tetranitromethane. Pyridoxal 5'-phosphate can prevent this modification efficiently, whereas pyridoxal 5'-phosphate N-oxide cannot, indicating that the free pyridinium N is required for the interaction of the coenzyme with the tyrosyl residue, probably via a hydrogen bond. The weakened binding of the coenzyme to the modified enzyme was confirmed on gel filtration, the modified enzyme being dissociated from the coenzyme seven-fold faster than the native enzyme. Furthermore, absorption spectral analyses demonstrated that the modified enzyme can catalyze the transaldimination step, but fails to abstract the alpha-H of substrates. The tyrosyl residue, therefore, not only participates in coenzyme binding, but also contributes to alpha-H labilization.

Binding Sites↗
PubMed1986

Serial transmission of human T-cell leukemia virus type I by blood transfusion in rabbits and its prevention by use of X-irradiated stored blood.

Human T-cell leukemia virus type I (HTLV-I) was serially transmitted for 5 passages from rabbit to rabbit by blood transfusion. The virus could be transmitted with 20 ml of whole blood or washed blood cell suspension (fresh or stored for 1-2 weeks at 4 degrees C) but not with cell-free plasma from seroconverted rabbits. Seroconversion occurred 2-4 weeks after blood transfusion and serum anti-HTLV-I titers ranged from 1:20 to 1:640 with the immunofluorescence assay. From transfusion recipients of the 1st to 4th passages, virus-producing cell lines were established by culturing lymphocytes in the presence of T-cell growth factor (TCGF). Three of the 4 cell lines became TCGF-independent after 2-12 months of continuous culture. Blood was transfused between rabbits of opposite sexes and the recipient origin of each cell line was determined by chromosome analysis. We also investigated the effect of X-irradiation (6,000 rad) on blood from seropositive rabbits. Seroconversion likewise occurred in rabbits transfused with blood that had been irradiated immediately before transfusion but not in rabbits transfused with blood that had been irradiated and stored for 1-2 weeks at 4 degrees C. Thus, our rabbit model shows that HTLV-I is serially transmissible by blood transfusion and that this can be prevented by irradiation of blood. The same procedure, therefore, may be useful for the prevention of transfusion-related transmission of HTLV-I in humans.

Animals↗
PubMed1986

New pteridine substrates for dihydropteridine reductase and horseradish peroxidase.

The oxidation of 4,5-diaminopyrimidin-6(1H)-one, 5,6,7,8-tetrahydropteridin-4(3H)-one, its 6-methyl and cis-6,7-dimethyl derivatives, and 6-methyl- and cis-6-7-dimethyl-5,6,7,8-tetrahydropterins, by horseradish peroxidase/H2O2 is enzymic and follows Michaelis-Menten kinetics, and its Km and kcat. values were determined. This oxidation of 5,6,7,8-tetrahydropterins produces quinonoid dihydropterins of established structure, and they are known to be specific substrates for dihydropteridine reductase. By analogy the peroxidase/H2O2 oxidation of the 5,6,7,8-tetrahydropteridin-4(3H)-ones should produce similar quinonoid dihydro species. The quinonoid species derived from 5,6,7,8-tetrahydropteridin-4(3H)-one and its 6-methyl and cis-6,7-dimethyl derivatives are shown to be viable substrates for human brain dihydropteridine reductase, and apparent Km and Vmax. values are reported.

Brain↗
PubMed1986

Centromere spreading in a case of megaloblastic anemia "cured" under TC 199 culture conditions.

The present study discusses the possible reasons of appearance and disappearance of centromere spreading in chromosomes obtained from bone marrow cultures in RPMI 1640 and TC 199 media, respectively, in a case of megaloblastic anemia. This prevention or curing effect of centromeric region is suggested to have occurred due to exogenous thymidine present in TC 199 medium, probably reflecting the failure of proper DNA synthesis.

Aged↗
PubMed1986

New variant translocation (1;8;21) in a case of acute myeloblastic leukemia (M2).

A new translocation involving chromosome #1, #8, and #21 in a patient with type M2 acute myeloblastic leukemia is reported. The breakpoint of #1 in this case was at band p13 and differed from that in two previously reported cases of t(1;8;21) involving the long arm of #1. A key event leading to the development of the M2 phenotype appears to be a break at band q22 of #8 with associated translocation of the terminal end of the long arm of #21.

Adult↗
PubMed1986

Trichosporon beigelii pneumonia in a patient with malignant histiocytosis.

A 30-year-old previously healthy housewife presented with bilateral pulmonary infiltrates. She was treated with various antibiotics but died with disseminated intravascular coagulation. Cultures of tracheal aspirates obtained prior to her death yielded Trichosporon beigelii. Postmortem examination revealed T. beigelii pneumonia with fungal dissemination in other organs. In addition, many organs were found to be infiltrated with atypical mononuclear cells which exhibited cytochemical properties of histiocytes. It was considered, therefore, that T. beigelii pneumonia developed on the basis of underlying malignant histiocytosis. T. beigelii in her lung sections was fluorescently stained with rabbit antiserum to the fungus isolated from the patient. This is the first report of Trichosporon beigelii pneumonia associated with malignant histiocytosis.

Adult↗
PubMed1986

Undifferentiated renal cell carcinoma in infancy: report of a case and review of literature.

A case of rapidly progressed undifferentiated renal cell carcinoma in a 2 2/12-month-old boy is reported. The histology is characterized by sarcomalike spindle and pleomorphic cells and bizarre giant cells, thus creating many difficulties in the differential diagnosis. The diagnosis of renal cell carcinoma was established on the basis of tubular formation by clear and granular cells observed in a few discrete areas. The literature on renal cell carcinoma occurring under 10 years of age was reviewed, with special attention given to histological typing. It is generally believed that renal cell carcinoma in children is well differentiated, but 2 of 39 cases reviewed were undifferentiated. We conclude that renal cell carcinoma in infants or young children may have an undifferentiated, atypical histological appearance and can progress rapidly. The differential diagnosis from anaplastic Wilms' tumor and sarcomatous tumors of the kidney in children is discussed.

Autopsy↗