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K D Cooper

Publications and source records attributed to K D Cooper.

167 records · Page 10Linked to original sources

Polyamine compartmentalization in various human disease states.

Whole blood was separated into preparations of erythrocytes, mononuclear leukocytes, polymorphonuclear leukocytes, platelets and plasma. Each preparation was analyzed for the concentration of the polyamines putrescine, spermidine and spermine. This was done in 17 controls, 14 patients with psoriasis, four patients with hereditary elliptocytosis, two patients with chronic lymphocytic leukemia and one patient each with lung cancer, non-Hodgkin's lymphoma, sickle cell anemia with mild psoriasis, and progeria. In patients with elevated blood polyamine levels, absorption onto erythrocytes was relatively common, and the spermine/spermidine ratio was useful in localizing abnormalities and characterizing the nature of the polyamine alteration. Proliferative states were associated with elevated spermine/spermidine ratios relative to controls while this relationship was reversed in erythropathies such as hereditary elliptocytosis and sickle cell anemia.

Blood Platelets↗

Polyamine distribution in cellular compartments of blood and in aging erythrocytes.

Human blood was separated into pure preparations of erythrocytes, mononuclear leukocytes, polymorphonuclear leukocytes, platelets, and platelet free plasma. The mean concentrations of putrescine, spermidine, and spermine per 10(9) cells were found to be several orders of magnitude higher for leukocytes than erythrocytes. There was no significant difference between leukocyte types. Platelets and plasma had relatively low levels in proportion to the amounts contributed by erythrocytes and leukocytes to whole blood. Human erythrocytes were age-separated by density and the changes in polyamine concentrations in maturing erythrocytes were documented. There were highly significant statistical differences between young and old red blood cells for putrescine, spermidine and spermine. The clinical use of red blood cell polyamines as an indicator of the activity of the bone marrow in anemic states is suggested.

Adult↗

Protein synthesis initiation factors from chicken erythroblasts.

Two factors (IF-I and IF-II) necessary for the initiation of protein synthesis have been partially purified from a 0.5 M KC1 wash of chicken erythroblast polysomes. IF-I mediates the binding of the initiator tRNA and GTP to a 40 S ribosomal subunit, resulting in the formation of a 44 S initiation intermediate. In the presence of IF-II and a suitable RNA template, the 44 S initiation intermediate combines with a 60 S ribosomal subunit to form a functional 80 S initiation complex. The methionyl moiety of the initiator tRNA in the 80 S initiation complex is able to react with puromycin to form methionylpuromycin.

Animals↗

Cyclosporine A.

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Administration, Oral↗