ABSTRACT
The acute influence of doxorubicin (DXR) and its analogue - 4'-epidoxorubicin (4'-epiDXR) on cardiovascular system in rabbits was compared. A single intravenous dose of DXR (1 and 3 mg/kg) did not affect the cardiac index, stroke index and heart rate, but reduced the mean arterial blood pressure and total peripheral resistance. In contrast, 4-epiDXR, in the same doses, did not affect any of the hemodynamic parameters.
Subject(s)
Doxorubicin/pharmacology , Epirubicin/pharmacology , Hemodynamics/drug effects , Animals , Blood Pressure/drug effects , Cardiac Output/drug effects , Doxorubicin/administration & dosage , Epirubicin/administration & dosage , Female , Heart Rate/drug effects , In Vitro Techniques , Injections, Intravenous , Male , Rabbits , Time Factors , Vascular Resistance/drug effectsABSTRACT
Propranolol (1) decreases hepatic blood flow and glucagon (2) exerts an opposite effect on hepatic circulation. The effects of these drugs on the pharmacokinetics of phenazone (3; antipyrine)-a compound with low coefficient of hepatic extraction, and sodium salicylate (4) that is highly extracted by liver, were studied on rabbits. It was shown that changes in the pharmacokinetics of 3 and 4 in the presence of 1 or 2, seemed to be interactions between these drugs in the haemodynamic phase.
Subject(s)
Antipyrine/pharmacokinetics , Glucagon/pharmacology , Propranolol/pharmacology , Salicylates/pharmacokinetics , Animals , Female , Half-Life , Liver Circulation/drug effects , Male , Rabbits , Salicylic AcidABSTRACT
Four groups of rats were given: cadmium chloride (Cd), cadmium chloride and mercuric chloride (Cd + Hg), cadmium chloride and sodium selenite (Cd + Se), or cadmium chloride, mercuric chloride, and sodium selenite (Cd + Hg + Se). All animals received subcutaneous doses of 115mCdCl2 (0.3 mg Cd/kg) every other day for 2 weeks. Mercuric chloride was administered intravenously at doses of 0.5 mg Hg/kg every other day, and Na2 75SeO3 intragastrically at doses of 0.1 mg Se/kg every day for a fortnight. The whole-body and organ retention of cadmium changed slightly with the type of exposure. A significant interaction effect of the examined elements was noted in the nuclear and soluble fractions of the liver and kidneys. Mercury decreased the cadmium concentration in both the nuclear and soluble fractions of the kidneys and diminished the effect of selenium on the cadmium level in the soluble fraction of the kidneys. In the liver the presence of mercury contrary to selenium, lowered the cadmium level in the nuclear fraction. The pattern of cadmium binding to proteins of the soluble fraction of the kidneys and liver remained the same in all groups of animals.
Subject(s)
Cadmium Poisoning/metabolism , Cadmium/metabolism , Mercury Poisoning/metabolism , Selenium/poisoning , Animals , Chromatography, Gel , Drug Interactions , Female , Mercury/metabolism , Rats , Rats, Inbred Strains , Scintillation Counting , Selenium/metabolism , Subcellular Fractions/metabolism , Tissue DistributionABSTRACT
Three groups of rats were given sodium selenite (Se), sodium selenite and cadmium chloride (Se + Cd), or sodium selenite, cadmium chloride, and mercuric chloride (Se + Cd + Hg), respectively. All animals received subcutaneous doses of 115CdCl2 (0.3 mg Cd/kg) every other day for a fortnight. Mercuric chloride was administered intravenously at doses of 0.5 mg Hg/kg every other day and Na2 75SeO3 intragastrically at doses of 0.1 mg Se/kg every other day for 2 weeks. The whole-body retention of selenium was slightly elevated by cadmium and increased threefold by cadmium with mercury (mainly blood, liver, and kidneys). Cadmium did not affect subcellular levels of selenium in the kidneys and slightly increased the selenium content in the soluble fraction of the liver. On the other hand, combined administration of mercury and cadmium induced a significant elevation of the selenium content in all subcellular fraction of the kidneys and in the nuclear and mitochondrial fractions of the liver. In all animal groups selenium was bound in the soluble fractions of both the liver and kidneys by high-molecular-weight proteins.
