Sequence-nonspecific suppression of gene expression by double-stranded RNA in silkworm cultured cells

Kosuke Sakashita, Tsuneyuki Tatsuke, Jae Man Lee, Yutaka Kawaguchi, Takahiro Kusakabe

研究成果: ジャーナルへの寄稿学術誌査読

5 被引用数 (Scopus)


Double-stranded RNA (dsRNA) induces various biological responses in eukaryotic cells. Sequence-specific RNA interference (RNAi) is highly conserved throughout eukaryotic organisms. In mammalian cells, long dsRNA is known to have sequence-nonspecific gene silencing effect by activating several cellular pathways. As for insect cells, only the smallest amount of information has been reported so far. Here, we investigate the sequence-nonspecific effect of dsRNA on gene expression in a lepidopteran cell line, silkworm Bombyx mori BmN4. Cells were cotransfected with long dsRNA and a reporter plasmid expressing luciferase or β-galactosidase, and measured for the activities of each enzyme. dsRNAs which are not homologous to the target gene reduced the reporter activity in a concentration-dependent manner, albeit its effective concentration was considerably higher than that caused by dsRNA homologous to the target gene. The sequence-nonspecific repression by non-homologous dsRNAs was further confirmed using dsRNAs complementary to several genes from some organisms such as silkworm, fruit fly and human, as well as a synthetic dsRNA, polyinosinic-polycytidylic acid (poly(I:C)). Since the sequence-independent effect by long dsRNA was also observed in another lepidopteran cell line, fall armyworm Spodoptera frugiperda Sf21, it may be one of the conserved immune responses among lepidopteran insects.

ジャーナルJournal of Insect Biotechnology and Sericology
出版ステータス出版済み - 2月 2009

!!!All Science Journal Classification (ASJC) codes

  • 応用微生物学とバイオテクノロジー
  • 昆虫科学
  • ビジネス、管理および会計一般
  • 農業および生物科学一般
  • バイオテクノロジー
  • 産業および生産工学


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