title: Terminal incorporation of 2'-deoxyadenosine into polyadenylate segments of polyadenylated RNA in G1-phase-arrested human T-lymphoblasts.
abstract: In the presence of the adenosine deaminase inhibitor erythro-9-[3(2-hydroxynonyl)]adenine microM concentrations of 2'-deoxyadenosine (dAdo) are toxic to nondividing human lymphoid cells and induce G1-phase arrest in T-leukemic lymphoblasts, effects which appear to be independent of ribonucleotide reductase inhibition by accumulated 2'-deoxyadenosine 5'-triphosphate. We sought to determine if 2'-deoxyadenosine 5'-triphosphate had effects similar to those of other cytotoxic adenosine analogues which are incorporated into polyadenylated RNA [poly(A)+ RNA]. In the presence of erythro-9-[3-(2-hydroxynonyl)]adenine, 8-14C]dAdo, at minimal cytostatic concentrations, was incorporated into the polyadenylate segments of cytoplasmic poly(A)+ RNA in the human T-leukemic lymphoblast line CCRF-CEM, and 70% of incorporated dAdo was in the 3'-terminal position. No DAdo was found in enzyme hydrolysates of nonpolyadenylated regions of poly(A)+ RNA or of poly(A)-RNA. Enzymic hydrolysis of polyadenylated segments from labeled poly(A)+ RNA yielded adenosine:dAdo ratios of approximately 55:1.
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives / Q000494:pharmacology; D002460:Cell Line; D002851:Chromatography, High Pressure Liquid; D003593:Cytoplasm / Q000378:metabolism; D003839:Deoxyadenosines / Q000378:metabolism* / Q000494:pharmacology; D005434:Flow Cytometry; D006801:Humans; D007399:Interphase / Q000187:drug effects*; D007945:Leukemia, Lymphoid / Q000378:metabolism*; D011061:Poly A / Q000378:metabolism*; D012313:RNA / Q000378:metabolism*; D012333:RNA, Messenger; D013601:T-Lymphocytes / Q000378:metabolism*
chemical_list: D003839:Deoxyadenosines; D012333:RNA, Messenger; D011061:Poly A; C010192:9-(2-hydroxy-3-nonyl)adenine; D012313:RNA; D000225:Adenine