title: Anticancer activity of RecQL1 helicase siRNA in mouse xenograft models.
abstract: Small interfering RNAs (siRNAs) are expected to have a medical application in human therapy as drugs with a high specificity for their molecular target mRNAs. RecQL1 DNA helicase in the human RecQ helicase family participates in DNA repair and recombination pathways in the cell cycle of replication. Silencing the RecQL1 expression by RecQL1-siRNA induces mitotic death in vitro specifically in growing cancer cells. By contrast, the same RecQL1 silencing does not affect the growth of normal cells, emphasizing that RecQL1 helicase is an ideal molecular target for cancer therapy. In this study, we show that local and systemic administration of RecQL1-siRNA mixed with polyethyleneimine polymer or cationic liposomes prevented cancer cell proliferation in vivo in mouse models of cancer without noticeable adverse effects. The results indicate that RecQL1-siRNA in a complex with a cationic polymer is a very promising anticancer drug candidate, and that in particular, RecQL1-siRNA formulated with a cationic liposome has an enormous potential to be used by intravenous injection for therapy specific for liver cancers, including metastasized cancers from the colon and pancreas.
authors.affiliation: GeneCare Research Institute, 19-2 Kajiwara, Kamakura, Kanagawa 247-0063, Japan.
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Futami
authors.forename: Emi
authors.initials: E
authors.lastname: Kumagai
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Makino
authors.forename: Ayumi
authors.initials: A
authors.lastname: Sato
authors.forename: Motoki
authors.initials: M
authors.lastname: Takagi
authors.forename: Akira
authors.initials: A
authors.lastname: Shimamoto
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Furuichi
mesh_terms: D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000201:enzymology / Q000235:genetics / Q000628:therapy; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015179:Colorectal Neoplasms / Q000201:enzymology / Q000235:genetics / Q000628:therapy; D005434:Flow Cytometry; D006801:Humans; D007124:Immunoenzyme Techniques; D008081:Liposomes; D008114:Liver Neoplasms, Experimental / Q000235:genetics / Q000556:secondary / Q000628:therapy; D008175:Lung Neoplasms / Q000201:enzymology / Q000235:genetics / Q000628:therapy; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009374:Neoplasms, Experimental / Q000188:drug therapy* / Q000201:enzymology / Q000235:genetics; D010190:Pancreatic Neoplasms / Q000201:enzymology / Q000235:genetics / Q000628:therapy; D011094:Polyethyleneimine / Q000737:chemistry; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000494:pharmacology*; D053484:RecQ Helicases / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D023041:Xenograft Model Antitumor Assays
chemical_list: D008081:Liposomes; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D011094:Polyethyleneimine; D053484:RecQ Helicases