Maxizymes and small hairpin-type RNAs that are driven by a tRNA promoter specifically cleave a chimeric gene associated with leukemia in vitro and in vivo.
Many leukemias result from chromosomal translocations that lead to the generation of chimeric oncoproteins. Chimeric gene for the promyelocytic leukemia-retinoic acid receptor alpha (PML-RAR alpha) is the hallmark of acute promyelocytic leukemia. Specific gene silencing of an oncogene is desirable for the treatment of these diseases. We have previously constructed an allosterically controllable ribozyme (designated maxizyme) targeted for bcr-abl chimeric mRNA, whose cleavage activity is induced only in the presence of a specific RNA sequence of interest. It has been demonstrated recently that RNA interference induced by short hairpin-type RNAs provides a powerful method for sequence-specific gene silencing. Here we report that DNA vector-based maxizymes and short hairpin-type RNAs driven by the promoter of a human gene for tRNA(Val) specifically inhibit the expression of the chimeric gene for PML-RAR alpha both in vitro and in vivo. Our findings confirm the potential utility of maxizymes and shRNAs as therapeutic agents.
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
Keisuke
K
Oshima
Hiroaki
H
Kawasaki
Yasushi
Y
Soda
Kenzaburo
K
Tani
Shigetaka
S
Asano
Kazunari
K
Taira
D001483:Base Sequence; D015973:Gene Expression Regulation, Leukemic; D020868:Gene Silencing; D006367:HeLa Cells; D006801:Humans; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics*; D009690:Nucleic Acid Conformation; D015514:Oncogene Proteins, Fusion / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics*; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic; D016337:RNA, Catalytic / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism*; D012366:RNA, Transfer, Val / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics; D014162:Transfection
D009363:Neoplasm Proteins; D015514:Oncogene Proteins, Fusion; D016337:RNA, Catalytic; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D012366:RNA, Transfer, Val; D011993:Recombinant Fusion Proteins; C093476:promyelocytic leukemia-retinoic acid receptor alpha fusion oncoprotein