S. Takeyama

Publications54
h-index10
Citations263
Highly Influential Citations5
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Effects of diltiazem on the physicochemical properties of rat erythrocyte and liposome membrane: comparison with pentoxifylline and propranolol.
In vitro effects of the coronary vasodilator diltiazem on rat erythrocytes and liposomes were studied in comparison with propranolol and pentoxifylline. Diltiazem improved the deformability of rat… Expand
  • 16
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Metabolism of a new cardiotonic agent, (-)-alpha-(3,4-dimethoxyphenethylaminomethyl)-4-hydroxybenzyl alcohol (TA-064), in man. O-demethylation and ring hydroxylation.
A method is described for the determination of plasma concentration of (-)-alpha-(3,4-dimethoxyphenethylaminomethyl)-4-hydroxybenzyl alcohol (TA-064), a new, selectively inotropic cardiotonic agent,… Expand
  • 10
  • 1
Studies of metabolic pathways of trimebutine by simultaneous administration of trimebutine and its deuterium-labeled metabolite.
Trimebutine maleate (I), (+-)-2-dimethylamino-2-phenylbutyl 3,4,5-trimethoxybenzoate hydrogen maleate, and a deuterium-labeled sample of its hydrolyzed metabolite, 2-dimethylamino-2-phenylbutanol-d3… Expand
  • 9
  • 1
Beta 1-adrenergic selectivity of the new cardiotonic agent denopamine in its stimulating effects on adenylate cyclase.
Effects of the new selectively beta 1-adrenergic cardiotonic drug denopamine (TA-064), (-)-(R)-1-(p-hydroxyphenyl)-2-[(3,4-dimethoxyphenethyl)amino]ethanol, on the adenylate… Expand
  • 5
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Synthesis and hypolipidemic activities of 5-thienyl-4-oxazoleacetic acid derivatives.
A series of 2,5-disubstituted 4-oxazoleacetic acid derivatives was synthesized and evaluated for hypolipidemic activity. Among them, those with a thienyl group at C-5 of the oxazole ring exerted… Expand
  • 13
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Pharmacokinetic studies on 1-(2-chloroethyl)-3-isobutyl-3-(beta-maltosyl)-1-nitrosourea (TA-077). I. Blood and tissue concentrations of a new nitrosourea antitumor agent TA-077 and its metabolite…
1-(2-Chloroethyl)-3-isobutyl-3-(beta-maltosyl)-1-nitrosourea (TA-077) is a new masked antitumor agent, which is hydrolyzed by maltase to give rise to a more cell-permeable and, hence, more cytotoxic… Expand
  • 2
Inhibition of the protein kinase by adenine compounds: competitive inhibition with respect to ATP.
Summary Rat liver adenosine 3′,5′-monophosphate ( cAMP )-dependent protein kinase was inhibited by 5×10−4M of adenine, adenosine, ADP and AMP, when assayed in the presence of 2×10−5M ATP. High… Expand
  • 14
The conversion of 17α-hydroxyprogesterone into pregn-4-en-3α,17α-diol-20-one and other substances by perfusions through bovine adrenals and ovaries
  • 13
Hypocholesterolemic activities of LK-903 and clofibrate in miniature pigs, cynomolgus monkeys and beagle dogs.
The hypocholesterolemic activities of LK-903 (α-methyl-p-myristyloxycinnamic acid-1-monoglyceride) and clofibrate were examined in miniature pigs (OHMINI-875) and beagle dogs. When administered in… Expand
  • 2
Pharmacokinetic studies on 1-(2-chloroethyl)-3-isobutyl-3-(beta-maltosyl)-1-nitrosourea (TA-077). II. Hydrolysis by tissue homogenates and drug uptake by tumor cells in vitro.
1-(2-Chloroethyl)-3-isobutyl-3-(beta-maltosyl)-1-nitrosourea (TA-077) was hydrolyzed to its glucosyl metabolite TA-G by homogenates of guinea pig organs, rabbit VX-2 carcinoma and rat Yoshida… Expand
  • 1