Lipids help double-stranded RNA in endosomal escape and improve RNA interference in the fall armyworm, Spodoptera frugiperda

Dhandapani Gurusamy, Kanakachari Mogilicherla, Jayendra Nath Shukla, Subba Reddy Palli

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

RNA interference (RNAi) is a valuable method for understanding the gene function and holds great potential for insect pest management. While RNAi is efficient and systemic in coleopteran insects, RNAi is inefficient in lepidopteran insects. In this study, we explored the possibility of improving RNAi in the fall armyworm (FAW), Spodoptera frugiperda cells by formulating dsRNA with Cellfectin II (CFII) transfection reagent. The CFII formulated dsRNA was protected from degradation by endonucleases present in Sf9 cells conditioned medium, hemolymph and midgut lumen contents collected from the FAW larvae. Lipid formulated dsRNA also showed reduced accumulation in the endosomes of Sf9 cells and FAW tissues. Exposing Sf9 cells and tissues to CFII formulated dsRNA caused a significant knockdown of endogenous genes. CFII formulated dsIAP fed to FAW larvae induced knockdown of iap gene, growth retardation and mortality. Processing of dsRNA into siRNA was detected in Sf9 cells and Spodoptera frugiperda larvae treated with CFII conjugated 32P-UTP labeled dsGFP. Overall, the present study concluded that delivering dsRNA formulated with CFII transfection reagent helps dsRNA escapes from the endosomal accumulation and improved RNAi efficiency in the FAW cells and tissues.

Original languageEnglish
Article numbere21678
JournalArchives of Insect Biochemistry and Physiology
Volume104
Issue number4
DOIs
StatePublished - Aug 1 2020

Bibliographical note

Publisher Copyright:
© 2020 Wiley Periodicals, Inc.

Keywords

  • Cellfectin II
  • RNA interference
  • Spodoptera frugiperda
  • double-stranded RNA

ASJC Scopus subject areas

  • Physiology
  • Biochemistry
  • Insect Science

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