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Biomedical subjects

N Murakami

Publications and source records attributed to N Murakami.

At least 577 records · Page 32Linked to original sources
PubMed1983

Combination chemotherapy for small cell carcinoma of the lung: evaluation of four-drug combination of cyclophosphamide, vincristine, methotrexate, and procarbazine.

Forty-one patients with small cell carcinoma of the lung were treated with a four-drug combination of cyclophosphamide, vincristine, methotrexate, and procarbazine. The response rate was 68% (28 responded among 41 patients), with 10 complete responses (24%) and 18 partial responses (44%). The median survival time from the initiation of chemotherapy was 11 months for patients with limited disease and 8 months for those with extensive disease. Patients who achieved complete response survived significantly longer than those who did not; the median survival time for complete responders was 14.5 months, compared to 8.5 months for partial responders and 6 months for non-responders. Myelosuppressive toxicity remained within acceptable limits, with 5% incidence of leukocytopenia (less than 1,000/microliter) and 7% incidence of thrombocytopenia (less than 50,000/microliter) following the first course of the regimen.

Adult↗
PubMed1983

[Chemotherapy of gastrointestinal cancer in elderly patients--evaluation of combination therapy with mitomycin C and 5-fluorouracil].

Sixty-three elderly patients with gastrointestinal cancer were treated with 5-fluorouracil (5-FU) or tegafur alone, and a combination of mitomycin C (MMC) and 5-FU. Judged by Koyama-Saito's criteria, the combination treatment was superior to single drug therapy. The response was somewhat correlated with survival in the combination regimen although it produced more gastrointestinal and myelotoxicities than the single drug. Our results suggest that the combination of MMC and 5-FU is useful in the treatment of gastrointestinal cancers in the elderly.

Aged↗
PubMed1982

pH-dependent effects of sodium tungstate on the steroid-binding properties of the hen oviduct progesterone receptor.

Effects of sodium tungstate on the steroid-binding properties of hen oviduct progesterone receptor were examined and were found to be pH-dependent. When freshly prepared hen oviduct cytosol containing progesterone receptor was heated at 37 degrees C for 20 min, its ability to bind [3H]progesterone decreased to 20% level of unheated samples. At pH 7, presence of 2-3 mM tungstate during the above incubation period reduced this loss of binding. At higher tungstate concentrations (greater than 5 mM), this stabilizing effect was gradually abolished. Similar results were obtained with preparations that contained [3H]progesterone-receptor complexes; 70-80% of which remained after a 20 min incubation at 37 degrees C in the presence of 2-3 mM tungstate at pH 7. At pH 8, presence of tungstate (1-10 mM) during the 37 degrees C incubation stabilized both the steroid-bound and the unoccupied progesterone receptor in a concentration-dependent manner. The extent of steroid binding by the receptor at 4 degrees C remained unchanged in the presence of up to 10 mM tungstate at both pH 7 and pH 8 assay conditions while presence of 20 mM tungstate lowered this binding capacity. These results indicate that tungstate effects may be mediated via its interaction with the progesterone receptor.

Animals↗
PubMed1982

Interaction of rat liver glucocorticoid receptor with sodium tungstate.

Effects of sodium tungstate on various properties of rat liver glucocorticoid receptor were examined at pH7 and pH 8. At pH 7, [3H]triamcinolone acetonide binding in rat liver cytosol preparations was completely blocked in the presence of 10--20 mM-sodium tungstate at 4 degrees C, whereas at 37 degrees C a 30 min incubation of cytosol receptor preparation with 1 mM-sodium tungstate reduced the loss of unoccupied receptor by 50%. At pH 8.0, tungstate presence during the 37 degrees C incubation maintained the steroid-binding capacity of unoccupied glucocorticoid receptor at control (4 degrees C) levels. In addition, heat-activation of cytosolic glucocorticoid-receptor complex was blocked by 1 mM- and 10 mM-sodium tungstate at pH 7 and pH 8 respectively. The DNA-cellulose binding by activated receptor was also inhibited completely and irreversibly by 5 mM-tungstate at pH 7, whereas at pH 8 no significant effect was observed with up to 20 mM-tungstate. The entire DNA-cellulose-bound glucocorticoid-receptor complex from control samples could be extracted by incubation with 1 mM- and 20 mM-tungstate at pH 7 and pH 8 respectively, and appeared to sediment as a 4.3--4.6 S molecule, both in 0.01 M- and 0.3 M-KCl-containing sucrose gradients. Tungstate effects are, therefore, pH-dependent and appear to involve an interaction with both the non-activated and the activated forms of the glucocorticoid receptor.

Animals↗