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Biomedical subjects

Y Harada

Publications and source records attributed to Y Harada.

At least 775 records · Page 43Linked to original sources
PubMed1982

A patient with gastric carcinoma improved remarkably on intraperitoneal OK-432 therapy.

A patient with an abdominal tumor and gastric cancer was treated with intraperitoneal OK-432 alone. Her general condition improved and the abdominal mass diminished significantly. The fluoroscopic radiography and gastroduodenal fiberscopic examinations revealed a slight improvement. Four months after the initiation of OK-432 therapy, microscopic examination of the biopsy specimen disclosed degenerated tumor cells with a pronounced accumulation of lymphocytes and large monocytes which were ascertained to be macrophages by the fluorescent antibody technique using anti-macrophage serum. This study revealed one possible mechanism of the antitumor action of OK-432.

Biological Products↗
PubMed1982

Changes in the levels of prostaglandins and thromboxane and their roles in the accumulation of exudate in rat carrageenin-induced pleurisy--a profile analysis using gas chromatography-mass spectrometry.

Injection of lambda-carrageenin into the pleural cavity of rats caused the accumulation of the pleural exudate. When levels of prostaglandins (PGs) and thromboxane (TX) B2 were quantified by gas chromatography-mass spectrometry as their methyl ester (ME)-dimethylisopropylsilyl (DMiPS) ether or ME-methoxime-DMiPS ether derivatives, 6-keto-PGF1 alpha reached the maximum at 1 hr after carrageenin, then PGE2 and TXB2 showed peaks at 3 hr and waned off before 9 hr. The PGF/ alpha level was kept low, but PGD2, PGE1 and PGF1 alpha were not detected. Aspirin (100 mg/kg, i.p.) significantly decreased the PG and TXB2 levels and suppressed the rate of plasma exudation until 5 hr, but did not at 7 hr, when it was measured by the amount of exuded pontamine sky blue injected intravenously. OKY-025 (300 mg/kg, i.p.), a selective TXA synthetase inhibitor, and tranylcypromine (20 mg/kg, i.p.), a PGI synthetase inhibitor, could not extensively inhibit the accumulation of the exudate. These results suggest that the cyclooxygenase products of arachidonic acid, particularly PGE2, definitely play an important role in the exudation during the first 5 hr.

Animals↗
PubMed1982

Thiolactomycin, a new antibiotic. IV. Biological properties and chemotherapeutic activity in mice.

The new thiolactone antibiotic, thiolactomycin, is rapidly absorbed in rats when administered either orally or by intramuscular injection. A peak in concentration of the drug is reached in the blood and in various visceral organs within 15 minutes after administration. The concentration decreases rather rapidly and about 51-69% of the drug is excreted in urine during the first 24 hours. Though the in vitro effect of thiolactomycin is moderate, it effectively protected mice challenged intraperitoneally with several strains of S. marcescens and K. pneumoniae and more effective than carbenicillin in treating experimental acute urinary tracts infected with S. marcescens. Also, in mice whom immunodefense was decreased by treatment with cyclophosphamide, thiolactomycin was more effective than carbenicillin against S. marcescens challenge.

Animals↗
PubMed1982

[Chronic toxicity study of latamoxef in beagle dog (author's transl)].

Chronic toxicity study of latamoxef (LMOX, 6059-S) by intravenous administration at dose levels of 100, 200 and 400 mg/kg daily for 6 months was carried out in adult Beagle dogs. All dogs of the 6059-S treated groups survived throughout the experimental period without showing any toxic signs other than occasional vomiting. Slight decrease of RBC, Ht, Hb and platelet, and increase of reticulocytes were noted in the 400 mg/kg group. Blood chemistry revealed decreased activity in GPT in the 6059-S treated groups, and increased contents of total protein and lipids in the 400 mg/kg group. These clinical changes were slight and transient in most instances. Liver and kidneys weights increased slightly without accompanying any pathological alterations. Inflammatory changes, probably due to mechanical irritation, were found in the subcutis and around the vein at the injection sites in all groups including the mannitol control group. From these results it is concluded that the maximum nontoxic dose in dogs is in the range of 200 to 400 mg/kg when the 6059-S was intravenously administered daily for 6 months.

Animals↗
PubMed1982

A new complement-dependent bactericidal factor found in nonimmune mouse sera: specific binding to polysaccharide of Ra chemotype Salmonella.

It has been shown that nonimmune mouse sera contain a complement-dependent bactericidal factor that reacts specifically with Ra chemotype Salmonella. In this study we investigate a specific determinant to which this factor binds. This factor bound to Ra chemotype lipopolysaccharide (LPS) but not to S or Re chemotype LPS. The binding was markedly inhibited by N-acetyl-D-glucosamine (GlcNAc), which was the nonreducing terminal of the Ra polysaccharide chain and by certain monosaccharides structurally relating to L-glycero-D-mannoheptose, a terminal component of a side branch of Ra polysaccharide. The factor bound to the Ra bacteria could be eluted with a medium containing GlcNAc. These results indicate that the specific determinant is the polysaccharide region of LPS characteristic of Ra chemotype Salmonella. Ca2+ but not Mg2+ was required for the specific binding of the factor to cells of Ra bacteria. A molecule composed of a polypeptide of 28,000 m.w. was found in the active fraction obtained by the monosaccharide elution. However, no polypeptides corresponding to light and heavy chains of mouse immunoglobins were detected from the active fraction.

Acetylglucosamine↗