Search results for "Human erythrocytes"
showing 4 items of 4 documents
Dietary indicaxanthin from cactus pear (Opuntia ficus-indica L. Mill) fruit prevents eryptosis induced by oxysterols in a hypercholesterolaemia-relev…
2015
Toxic oxysterols in a hypercholesterolaemia-relevant proportion cause suicidal death of human erythrocytes or eryptosis. This process proceeds through early production of reactive oxygen species (ROS), release of prostaglandin (PGE2) and opening of PGE2-dependent Ca channels, membrane phosphatidylserine (PS) externalisation, and cell shrinkage. The present study was the first to reveal that a bioavailable phytochemical, indicaxanthin (Ind) from cactus pear fruit, in a concentration range (1·0–5·0 μM) consistent with its plasma level after a fruit meal, prevents PS externalisation and cell shrinkage in a dose-dependent manner when incubated with isolated healthy human erythrocytes exposed to…
Enhancement of the Mutagenicity of Ethylene Oxide and Several Directly Acting Mutagens by Human Erythrocytes and its Reduction by Xenobiotic Interact…
1999
According to the present state of knowledge mutagenicity or genotoxicity of the ulti mate genotoxic agents ethylene oxide or styrene oxide cannot be increased by further me tabolism. However, in the present study we demonstrate that mutagenicity of several ultimate genotoxic substances is increased by human erythrocytes. For instance mu tagenicity of mafosfamide, N-nitroso-N-methylurea, ethylene oxide, and styrene oxide to Salmonella typhimurium TA 1535 was increased 5.5-, 5.1-, 2.7-, and 2.3-fold, respectively, by addition of human erythrocyte homogenate to the preincubation mixture in the Ames test. On the other hand, the mutagenicity of cumene hydroperoxide, benzo[a]pyrene-4,5-oxide, and…
Untersuchungen über den Einfluß langkettiger fettsaurer Salze auf Erythrozyten
1969
Natrium-oleat und Olsaure haben spezifische morphologische und funktionelle Wirkungen auf menschliche Erythrozyten in vitro. Eine Erhohung der Konzentration dieser Substanzen im Blut fuhrt zu reversiblen stechapfelformigen Veranderungen der Erythrozytenform, zur Hemmung der Blutkorperchensenkungsgeschwindigkeit und zur Senkung der Strukturviskositat des Blutes. Weiterhin wird bei Konzentrationen bis 45 mg% die osmotische Resistenz der Erythrozyten verbessert. Erst hohe Konzentrationen an Na-oleat im Blut fuhren zur Hamolyse. Investigations on the Influence of Long Chain Fatty Acid Salts on Erythrocytes Sodium oleate and oleic acid have specific morphological and functional action on human e…
Der erythrocytäre Magnesiumstoffwechsel bei intakter und kälteinhibierter Glykolyse
1962
Continuation of glycolysis in human erythrocytes by incubation of heparinized whole blood at 37°C is followed by a decrease in the Mg-content of red cells. On inhibition of glycolysis by cold (4°C), the Mg-content of erythrocytes remains unaltered or, often, slightly increases. These actions are in clear contrast to the behaviour of potassium ions under the same conditions.