title: Deoxyuridine suppression test: a comparison of two methods and effect of thymidine on the incorporation of 3H-deoxyuridine into DNA in human bone marrow cells.
abstract: Deoxyuridine suppression tests have been performed by two different methods of six normoblastic and eight megaloblastic marrows. A good correlation was obtained between the results by the modified and the original methods. The simplified method was found to be applicable for a clinical purpose to diagnose megaloblastosis in the marrow. Uptake of 3H-deoxyuridine into DNA and effect of various concentrations of thymidine was studied on five normoblastic and six megaloblastic marrows. In megaloblastic marrows, a greater amount of thymidine was required to obtain the same rate of suppression of 3H-deoxyuridine incorporation into DNA than in normoblastic marrows. Impairment of thymidine incorporation into DNA in megaloblastic marrows was not revealed. Therefore, lower rate of suppression of 3H-deoxyuridine by thymidine in megaloblastic marrows may be due to impairment of the incorporation of deoxyuridine before the addition of thymidine.
mesh_terms: D000749:Anemia, Megaloblastic / Q000175:diagnosis; D001853:Bone Marrow / Q000378:metabolism*; D001854:Bone Marrow Cells; D004247:DNA / Q000096:biosynthesis*; D003857:Deoxyuridine / Q000378:metabolism*; D003864:Depression, Chemical; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008722:Methods; D013936:Thymidine / Q000494:pharmacology*
chemical_list: D004247:DNA; D013936:Thymidine; D003857:Deoxyuridine