title: Cloning and characterization of polyA- RNA transcripts encoded by activated B1-like retrotransposons in mouse erythroleukemia MEL cells exposed to methylation inhibitors.
abstract: We have previously identified a DNA silent region located downstream of the 3'-end of the β(major) globin gene (designated B1-559) that contains a B1 retrotransposon, consensus binding sites for erythroid specific transcription factors and shares the capacity to act as promoter in hematopoietic cells interacting with β-globin gene LCR sequences in vitro. In this study, we have cloned four new non-polyA RNA transcripts being detected upon blockade of murine erythroleukemia (MEL) cell differentiation to erythroid maturation by methylation inhibitors and demonstrated that two of them share high structural homology with sequences of B1 element found within the B1-559 region. Although it is not clear yet whether and how these RNAs interfere with induction of erythroid maturation, these data provide evidence for the first time showing that methylation inhibitors can activate silent repetitive DNA sequences in MEL cells and may have implications in cancer chemotherapy using demethylating drugs as antineoplastic agents.
authors.affiliation: Laboratory of Pharmacology, Department of Pharmaceutical Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece.
authors.forename: Sotirios S
authors.initials: SS
authors.lastname: Tezias
authors.forename: Asterios S
authors.initials: AS
authors.lastname: Tsiftsoglou
authors.forename: Elsa P
authors.initials: EP
authors.lastname: Amanatiadou
authors.forename: Ioannis S
authors.initials: IS
authors.lastname: Vizirianakis
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D045744:Cell Line, Tumor; D003001:Cloning, Molecular; D003515:Cycloleucine / Q000494:pharmacology; D019175:DNA Methylation / Q000187:drug effects; D004121:Dimethyl Sulfoxide / Q000378:metabolism; D004915:Leukemia, Erythroblastic, Acute / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D011061:Poly A / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D018626:Retroelements / Q000235:genetics*; D055544:beta-Globins / Q000235:genetics*
chemical_list: D018626:Retroelements; D055544:beta-Globins; D003515:Cycloleucine; D011061:Poly A; C048460:3-deazaneplanocin; D012313:RNA; C031096:neplanocin A; D000241:Adenosine; D004121:Dimethyl Sulfoxide