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Biomedical subjects

K Takada

Publications and source records attributed to K Takada.

At least 865 records · Page 48Linked to original sources
PubMed1983

[THP-adriamycin in head and neck tumor].

Primary effects and side-effects of a new anthracycline antineoplastic agent, THP-adriamycin (THP-ADM), were examined in 20 patients with malignant head and neck tumors. According to a classification by tumor sites, there were 6 cases of oropharynx, 6 of nose and sinuses, 3 of tongue, 2 of floor of mouth, 2 of neck and 1 of external auditory meatus. According to the tissue classification, there were 11 cases of squamous cell ca., 6 cases of malignant lymphoma, each one case of anaplastic ca., carcino sarcoma and adeno cystic ca. There were 16 previously untreated cases and 4 pretreated cases. Twelve cases received THP-ADM by intraarterial injection and 8 cases by the same dose. 10 to 20 mg/body 3 times a week, in a total of 40 to 100 mg. 2 CR, 5 PR, 3 MR and 4 NC in 14 cases with carcinoma, and 2 CR, 3 PR and 1 MR in 6 cases with malignant lymphoma were obtained. Among 12 cases receiving intraarterial injection, 3 CR and 5 PR were obtained. The decrease of WBC counts below 3000/mm3 after THP-ADM administration was observed in 9 cases. Side effect of THP-ADM appeared to be less severe than that of Adriamycin.

Adolescent↗
PubMed1983

Conversion of a novel 5-fluorouracil (5-FU) derivative to 5-FU in rats.

The converting efficiency of a novel 5-FU derivative, 1, 3-didecanoyl-2-[6-[(5-fluorouracil-l-yl) carbonylamino] hexanoyl]glyceride (DFUG), to 5-FU was investigated in rat plasma. The degradation half-life of DFUG was 4.04 min when DFUG was incubated in rat plasma at 37 degrees C, though DFUG was considerably stable in buffers having different pH values, pH 1, 5 and 7.4. After iv administration, DFUG disappeared rapidly from rat plasma and considerable amount of 5-FU was detected in rat plasma. By comparing the AUC (area under the plasma 5-FU concentration vs. time curve from time zero to infinity) values with that obtained after iv injection of 5-FU, the fraction of 5-FU formed from DFUG was estimated to be about 80% in rats.

Animals↗
PubMed1982

Changes in sterol metabolism in the skin of developing chick embryo and alterations in the presence of an anticholesterolemic agent and a chemical carcinogen.

Changes in sterol metabolism in the skin of chick embryo during its development were studied with embryonal chick skin and with the cultured skin tissues. Changes in sterol metabolism of the skin of chick embryo began to appear at day 17, as observed by the accumulation of dihydrolanosterol, and the ratio of dihydrolanostrol:cholesterol increased thereafter until hatching. A similar change in sterol metabolism was also observed with the cultured skin tissue of chick embryo, although the stages of development seem to have been delayed by 3 days. The active sterol metabolism of the cultured skin tissue was also confirmed by studies of incorporation of [2-14C]acetate into sterols. 20,25-Diazacholesterol almost completely inhibited the incorporation of [2-14C]acetate into C27 sterols, whereas a chemical carcinogen, 4-hydroxyaminoquinoline 1-oxide, inhibited the incorporation of [2-14C]acetate into lathosterol but not that into cholesterol.

4-Hydroxyaminoquinoline-1-oxide↗
PubMed1982

Evolution of infectious mononucleosis into Epstein-Barr virus carrying monoclonal malignant lymphoma.

A monoclonal malignant lymphoma was diagnosed in a 30-month-old Japanese boy, who, since the age of 12 months, had had chronic, recurrent infectious mononucleosis manifested by repeated episodes of severe cough and high fever accompanied by marked lymphadenopathy and hepatosplenomegaly and high serum Epstein-Barr virus (EBV) antibody titres. The diagnosis of Burkitt's lymphoma was made when a cervical lymph-node biopsy specimen revealed massive proliferation of immature B-cells with starry-sky histiocytes. These lymph-node cells were characterised by a translocation between chromosomes 10 and 17. There were approximately 9 EBV genome-equivalents per cell. Most cells were positive for nuclear antigen (EBNA); early antigen (EA) and viral capsid antigen (VCA) were also detected. The presence of EBV was supported by finding that the cell-free lymph-node extract transformed cord-blood lymphocytes into EBNA-positive blast cells. The proportion of EA-positive and VCA-positive cells increased rapidly in culture for 24 h, then the positive cells degenerated rapidly and completely. The cells also contained numerous herpes-type virus particles. The child improved considerably with cytostatic treatment and has been in remission for 2 years.

Antibodies, Viral↗
PubMed1982

Muscle histochemistry in congenital muscular dystrophy with central nervous system involvement.

Muscles from 13 patients with clinical characteristics of congenital muscular dystrophy and central nervous system involvement (Fukuyama type) (FCMD) were examined using morphometric and fiber type analysis. The muscles from patients aged 5 months to 3 years demonstrated small-calibered fibers with increased variation in fiber size, connective tissue proliferation, and scattered necrotic and regenerating fibers. Groups of atrophic fibers were absent. Both type 1 and type 2 fibers were affected, though type 1 fibers predominated and type 2B fibers decreased as the disease progressed. The muscle changes were apparently progressive, affecting not only the limbs but also the intercostal, diaphragm, and cardiac muscles. Although there was no qualitative difference in the muscle histochemistry between FCMD and Duchenne muscular dystrophy (DMD), there was a greater proportion of type 2C fibers and fibrosis was present at the early infantile stage of FCMD.

Adenosine Triphosphatases↗
PubMed1982

Simple assay method for susceptibility of human lymphocytes to Epstein-Barr virus infection.

On the basis of the sequential early events induced by Epstein-Barr virus (EBV), the infectivity of human lymphocytes to EBV was quantified as a plateau value of the maximum nuclear antigen (EBNA) synthesis preceding cellular DNA synthesis. The frequency of EBV-infectible cells was an average of 7.6% of unfractionated umbilical cord lymphocytes and was 4.9% in the counterparts from human adults. In the B-cell-enriched populations, the average plateau values were 29.2% in umbilical cord and 15.5% in adult samples. This method is simple and applicable for quantitative assay of the sensitivity to EBV infection of a given lymphocyte preparation.

Adult↗
PubMed1982

EMG approach to assessing tongue activity using miniature surface electrodes.

Miniature surface electrodes were developed to examine the EMG activity of the tongue during various functions under normal physiological conditions with minimal fear and discomfort to human subjects. An outline of the electrodes, which consist of electrically high-conductive silver paste, small rubber caps, and fine wires, is introduced, and the practicability of their clinical application is discussed.

Adolescent↗