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Biomedical subjects

S Hanada

Publications and source records attributed to S Hanada.

At least 163 records · Page 9Linked to original sources
PubMed1984

Anti-inflammatory effects of praseodymium, gadolinium and ytterbium chlorides.

Anti-inflammatory effects of chloride salts of praseodymium, gadolinium and ytterbium were investigated, using various experimental inflammatory models in rats. The lanthanide salts administered by oral route showed no significant effect, but when injected intraperitoneally they significantly inhibited the carrageenin-induced oedema, proportional to their doses ranging from 15 to 75 mg/kg. They also reduced nystatin-induced oedema and vascular permeability response to histamine and serotonin. Pronounced inhibitory effect of lanthanide salts at the dose of 50 mg/kg, i.p., was observed in histamine- and serotonin-induced changes in vascular permeability. Repeated administration of lanthanide salts in the dose of 20 mg/kg for 13 d significantly inhibited arthritis development. The same dose of these salts for a 6-d period similarly reduced granuloma formation. However, praseodymium, gadolinium and ytterbium chlorides showed no significant difference among themselves and their anti-inflammatory effects were smaller than those from phenylbutazone.

Animals↗
PubMed1983

Potentiating effects of methylxanthines on teratogenicity of mitomycin C in mice.

A previous study demonstrated that caffeine strongly potentiated the teratogenic action of mitomycin C in mice. In the present study the effect of methylxanthines including caffeine, theophylline, theobromine (theobromine sodium salicylate), paraxanthine, and 1-methylxanthine was compared in order to analyze the structure-activity relationship. Jcl:ICR mice were injected IP with 3 mg/kg of mitomycin C, immediately followed by SC injection of each methylxanthine on day 11 of gestation. The doses of methylxanthines were calculated so that the mice received 50 mg/kg of caffeine or the equimolecular amount of the other methylxanthines. Fetuses were examined for external malformations on day 18 of gestation. Mitomycin C at 3 mg/kg and the methylxanthines at the doses used were not teratogenic. Combined administration of caffeine or theophylline with mitomycin C produced more than 80% of malformed fetuses. Although less effective than caffeine or theophylline, paraxanthine also significantly increased the incidence of malformed fetuses. Theobromine and 1-methylxanthine were virtually ineffective. From these findings, it is suggested that the methyl group at N-1 position of the xanthines is important for the enhancement but the N-1 methylation alone is ineffective unless accompanied with the substitution of the methyl moiety at the other position(s).

Abnormalities, Drug-Induced↗
PubMed1983

Some characteristics of acute inflammation induced by econazole.

Aqueous suspension of econazole nitrate injected into subplantar region of rat foot induces a sharp and long-lasting inflammation. The econazole-induced edema is characterized by the existence of two phases of accelerated evolution, with peak values at 2nd and 12th hr after injection. Only the second phase of econazole-induced edema is selectively inhibited by either steroidal or non-steroidal anti-inflammatory drugs.

Animals↗
PubMed1983

A report of a case of T-cell-derived chronic lymphocytic leukemia with antibodies to adult T-cell leukemia-associated antigens.

A case of T-cell-derived chronic lymphocytic leukemia (T-CLL) with antibodies to adult T-cell leukemia (ATL)-associated antigens (ATLA) is reported. The patient had marked lymphocytosis consisting of peripheral cells that were shown to be T cells by their spontaneous sheep erythrocyte rosette formation and their OKT3 and OKT8 positivity, and in which ATLA were also detected after short-term culture of the cells in vitro. These findings suggest that adult T-cell leukemia virus (ATLV) might cause not only ATL but also some other lymphoid malignancies such as a type of T-CLL as in this case report. Nevertheless the occasional development of OKT8-positive T-CLL in a healthy carrier of ATLV in an ATL-endemic area cannot be disregarded.

Aged↗
PubMed1983

Hodgkin's disease in the endemic area of adult T-cell leukemia (ATL).

Antibodies to adult T-cell leukemia associated antigen (ATLA) in the sera from 14 patients with Hodgkin's disease (HD) were examined by the indirect immunofluorescence method. All patients were born in the ATL-endemic area, Kagoshima and Miyazaki prefectures, of Japan. Seven of the 13 evaluable patients (54%) gave positive reactions in the anti-ATLA test. Most of the positive patients were over 40 years of age and the positive rate in males was higher than that in females. The most interesting finding in the anti-ATLA positive patients was the presence of circulating abnormal lymphocytes which are usually found in ATL patients. Histological subclassification of the positive patients had no tendency to converge into a particular subclass of HD. Although there was no definite evidence to show an etiological relationship between ATL virus and HD, several findings in this study seem to suggest that in anti-ATLA positive patients, especially in the ATL-endemic area, the anti-ATLA positive state might have some inevitable influence on the natural history of their HD.

Adult↗
PubMed1983

Selection of 53 PFC substances for better stability of emulsion and improved artificial blood substitutes.

In order to develop a new PFC emulsion which is better than Fluosol-DA as an artificial blood substitute, 53 different kinds of PFCs were evaluated from the aspects of toxicity, excretion rate and emulsion stability. From the results of the screening test, FMOQ was selected as the best material for a new emulsion. The half-life of FMOQ in the body of rats was calculated to be 7 days which was similar to FDC in Fluosol-DA, and its emulsion stabilized with the mixture of YPL and Pluronic F68 was stable at 4 degrees C for longer than 6 months. Rats extensively exchange-transfused with this emulsion survived well for a long period, indicating a high efficacy and low toxicity of this emulsion. In conclusion the FMOQ emulsion was selected to be a hopeful candidate for a second generation of artificial blood substitutes. This work was partially supported by NHLBI Contract NO1-HB-2927.

Animals↗
PubMed1982

[Experiences with intravenous drip infusion therapy of amikacin for severe infections in patients of hematological disorder].

Amikacin was studied for clinical effect in 7 patients with acute leukemia, 1 patient with chronic myelogenous leukemia-blastic crisis, 1 patient with malignant lymphoma and 1 patient with aplastic anemia, who were suffered from severe infection such as sepsis, pneumonia or subcutaneous abscess. Most of these patients had bleeding tendency, so amikacin was administered by intravenous drip infusion in a dose of 200 mg--400 mg for 1 hour. Total doses of amikacin were between 3.2 g and 12.6 g. These doses of amikacin gave good response to 3 patients with sepsis, 1 patient with subcutaneous abscess and 1 patient with pneumonia. We didn't observe any side effect most likely associated with amikacin. Therefore, intravenous drip administration of amikacin might be useful drug for management of severe infections in patients of hematological disorder, and seemed to be as safe as intramuscular administration.

Adolescent↗