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Biomedical subjects

C Itoh

Publications and source records attributed to C Itoh.

90 records · Page 5Linked to original sources
PubMed1983

[Double-blind comparative clinical evaluation of cefamandole and cefmetazole in the treatment of respiratory tract infections].

Cefamandole sodium (CMD), a new cephalosporin-derivative, was synthesized in the Laboratory of Eli-Lilly Co. Ltd. U.S.A. in 1972. CMD, which is several times more active than cefmetazole (CMZ, a cephamycin antibiotic) against Gram-positive cocci, is only as active as the latter antibiotic against Gram-negative bacilli. Against Haemophilus influenzae, CMD exhibits an antimicrobial activity which is as strong as that of ampicillin sodium. Our previous comparative tests on efficacy and safety of CMD versus cefazolin (CEZ) demonstrated that CMD was as effective and safe as CEZ in the treatment of respiratory tract infections. In the present clinical trial, the efficacy and safety of CMD are evaluated by a comparative double blind method using CMZ, a more recently synthesized cephamycin antibiotic, as a reference drug. For this purpose, a comparative double blind study was carried out in 50 institutions and clinics in Tohoku and Hokkaido districts in Japan. A total of 272 inpatients, who was aged over 16 years and was diagnosed as having pneumonia, lung abscess or acute infectious exacerbation of chronic obstructive pulmonary diseases, was included in this trial. They received 2 g of CMD or CMZ twice a day by intravenous drip infusions, as a rule, for 14 days. Of these patients, 264 (133 received CMD and 131 CMZ) were available for the evaluation of safety and usefulness. Two hundred and thirty-eight patients (122 received CMD and 116 CMZ) were adopted for the evaluation of efficacy. Prior to the treatment, there was no significant difference with respect to age, sex, severity of infection and underlying diseases between subjects in 2 treatment groups. An excellent or good clinical response was obtained in 82% of the patients treated with CMD, and in 81% of those treated with CMZ. Thus, there was no significant difference in cure rate between 2 treatment groups. However, an excellent clinical response was found in 12.3% of the patients treated with CMD, whereas only in 4.3% of those treated with CMZ. This difference in percentage of excellent clinical response between 2 treatment groups was statistically significant (P less than 0.05). Of the 87 patients with moderate to severe infection who were treated with CMD, 13 showed an excellent response. Only 4 of 90 patients treated with CMZ showed an excellent response. Statistically the difference in the rate of excellent response between these 2 groups was significant (P less than 0.05).(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1983

Possible antiarrhythmic activities of trapidil.

Possible antiarrhythmic activities of 5-methyl-7-diethylamino-s-triazolo(1,5-a)pyrimidine (trapidil, Rocornal) were investigated in vitro and in vivo. Trapidil significantly increased the amount of aconitine or ouabain needed for production of ventricular arrhythmias in rats and guinea pigs. Trapidil also produced a significant increase in threshold current of electrical stimuli which induced ventricular tachycardia in dogs under acute myocardial ischemia. Electrophysiological examinations on effects of trapidil on isolated rabbit ventricular muscle cells showed shortening of the action potential duration (APD) and prolongation of the effective refractory period (ERP), resulting in an increase in the ratio of ERP/APD. The results indicate that trapidil will have a possible effectiveness in inhibiting ventricular arrhythmias.

Aconitine↗
PubMed1981

Association of HLA with humoral immune responses.

The association of HLA with humoral immune responsiveness to various common antigens was studied. Increased frequencies of HLA-A2 in the higher cold agglutinin group and of B5 in the lower heterophil antibody group were observed. But these increases were not statistically significant. Although simple phenotype frequency of neither A9 nor B5 was associated with any group studied, the positive linkage disequilibrium for haplotype of A9-B5 was observed in the higher antibody titer groups of anti-streptolysin O, cold agglutinin and heterophil antibody and in the anti-HBs antigen negative group as well as in the general Japanese population. These results suggest that there may be humoral immune response and/or suppressive genes linked to the chromosomal area where the genes coding A9-B5 exist.

Antibody Formation↗
PubMed1980

[Pharmacological properties of trapidil: comparison with other coronary vasodilators (author's transl)].

Effects of trapidil and other coronary vasodilators on retrograde blood flow in acute coronary-ligated dogs, isolated large and small coronary arteries of pig, platelet aggregation, biosynthesis of prostacyclin in isolated aortic rings and hyperlipemia in quails were investigated. Trapidil showed an increase in retrograde blood flow while dipyridamole, nifedipine, diltiazem and dilazep did not. Trapidil and nitroglycerin relaxed large coronary arteries, while dipyridamole, diltiazem, dilazep and adenosine relaxed small arteries. Trapidil, dipyridamole, diltiazem and aspirin protected against the secondary phase of ADP-induced platelet aggregation in guinea-pig platelet rich plasma more effectively than did nifedipine and dilazep. Trapidil and aspirin protected only against rabbit platelet aggregation as induced by arachidonic acid. Moreover, only trapidil protected against platelet aggregation as induced by prostaglandin G2-thromboxane A2 mixture. Trapidil and dipyridamole enhanced the platelet aggregation protection of prostacyclin. Trapidil also facilitated biosynthesis of prostacyclin more markedly than did the other drugs. Trapidil increased serum content of HDL cholesterol and significantly lowered serum content of triglyceride and the ratio of LDL cholesterol to HDL cholesterol in hyperlipemic quails. Dipyridamole, diltiazem, nifedipine and dilazep, however, showed little effect.

Animals↗
PubMed1978

Kappa-type light chain crystal storage histiocytosis.

An autopsy case of systemic histiocytosis with excessive deposition of kappa-type light chain crystals was reported in a 58 year-old man who had consistently showed kappa-type light chain paraproteinemia, Bence Jones proteinuria and hypogammaglobulinemia for about 10 years until his death. However, no bony destruction was found by repeated X-ray examinations. At autopsy, extensive hyperplasia of crystal-storing histiocytes was observed in the bone marrow, spleen, liver, lymph nodes, interstitial tissues of visceral organs and loose connective tissues. In the bone marrow and some other tissues, mild proliferation of plasmocytoid cells containing small crystals were found. Histochemically the crystals positively stained with various methods for amino acids and proteins, especially with Weigerts' method for fibrin. Ultrastructurally intralysosomal crystal deposition was confirmed in the storage histiocytes and derivation of the crystals from Golgi's sacculi in the plasmocytoid cells was suggested. Biochemically the crystals were regarded as mainly consisting of dimers of a variable half of light chain immunoglobulin and immunochemically and immunohistochemically reacted to anti-kappa type light chain serum. Such a generalized storage histiocytosis may be secondarily induced by immunoglobulin synthesized in plasmocytoid cells.

Crystallization↗