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Biomedical subjects

H Tezuka

Publications and source records attributed to H Tezuka.

88 records · Page 5Linked to original sources
PubMed1984

[Intraperitoneal and intrapleural two channel chemotherapy by cisplatinum (DDP) and sodium thiosulfate for the treatment of ovarian cancer].

We administrated cis-platinum 70-100 mg/m2 bolus, intraperitoneally or intrapleurally without diluting in saline, simultaneously combined with intravenous injection of sodium thiosulphate 1 gr/hr for 12 hours continuously or additional loading of sodium thiosulphate 4-6 g bolus on the initiation. The procedure does not require transfusion of specific hydration and keeps urine volume at a certain level, much less diuretics. For the treatment of 6 gynecological malignancies (2 primary ovarian carcinoma, 1 recurrent ovarian carcinoma, 1 pseudomyxoma peritonei, 1 clear cell carcinoma of cul de sac and 1 metastatic pleuritis carcinomatosa due to uterine cervical carcinoma) 12 courses treatments have been performed, without inducing nephrotoxicity except mild vomiting. All six cases are evaluable for efficacy according to Saito-Koyama criteria at this time: 4 CRs including 2 CRs for ascites and pleural effusion, 1 NC and 1 PD. This Two-Channel Chemotherapy (TCC) seems to be an important modality of chemotherapy for ovarian carcinoma in future.

Adenocarcinoma↗
PubMed1980

Sister-chromatid exchanges and chromosomal aberrations in cultured Chinese hamster cells treated with pesticides positive in microbial reversion assays.

The induction of sister-chromatid exchanges (SCEs), chromosomal aberrations and polyploids was investigated in cultured Chinese hamster cells treated with pesticides or a related compound positive in microbial reversion assays. The chemicals tested were captan, captafol, 1,2-dibromoethane (EDB), 1,2-dibromo-3-chloropropane (DBCP), 5-nitro-1-naphrhonitrile (NNN), p-dimethylaminobenzenediazo sodium sulfonate (DAPA), 2-hydrazinoethanol (HEH), vamidothion, dichlorovos (DDVP), N-nitroso-ethylenethiourea (N-nitroso-ETU), and 2,4-dinitrophenyl thiocyanate (NBT). A significant and dose-dependent increase in the frequency of SCEs and chromosomal aberrations was observed in the cell cultures treated with captan, captafol, EDB, DBCP, HEH, DDVP, vamidothion, DAPA or N-nitroso-ETU or NBT produced a significant increase in the frequency of polyploid cells, whereas the other agents did not. When compared with results from microbial reversion assays, a close correlation was observed between the ability to induce SCEs or chromosomal aberrations and the mutagenic potency in bacteria (r:0.71-0.84).

Aneuploidy↗
PubMed1978

Cytogenetic and dominant lethal studies on captan.

Possible mutagenic activity of captan was investigated by in vitro and in vivo cytogenetic studies and by the dominant lethal study in mice. In vitro cytogenetic study with cultured human diploid cells revealed a significant increase in the frequency of cells showing stickiness and a severe mitotic inhibition at concentrations of 3.0 and 4.0 microgram of captan per ml. although no chromosomal aberrations were observed. In in vivo cytogenetic study, no chromosomal aberrations were induced in the bone marrow cells of rats treated orally with captan at a single dose of 500, 1000 or 2000 mg/kg or at five consecutive doses of 200, 400 or 800 mg/kg/day. Dominant lethal study also failed to show any mutation induction after treatment of male mice with daily oral dose of 200 or 600 mg of captan per kg bw for five days.

Animals↗
PubMedDate not supplied

Heritable translocation study in male mice with trimethyl phosphate.

Dominant lethal and heritable translocation studies were performed in male mice receiving a single intraperitoneal injection of trimethyl phosphate (TMP). The germ cell stage investigated was the spermatid. Methyl methanesulfonate (MMS) was used as a positive control in the latter study. A dominant lethal assay gave marked dose-dependent increases in early fetal deaths. Heritable translocations were detected at 1000 or 1500 mg of TMP/kg in F1 male progeny when screening for semi-sterility and cytogenetically analyzing the meiotic or mitotic chromosomes. Translocation induction was higher at the higher TMP dose (14.3%) than at the lower dose (5.3%) and the yield from the higher dose was similar to that induced by 50 mg of MMS/kg (11.0%). Most of the translocation carriers were semi-sterile or sterile. The data confirm conclusions from other dominant lethal studies showing TMP to be capable of causing chromosomal damage in mouse spermatids and show that certain types of damage result in heritable translocations.

Animals↗