Intracellular microRNA expression patterns influence cell death fates for both necrosis and apoptosis

Akira Sato, Akihiro Yamamoto, Akira Shimotsuma, Yoko Ogino, Naoki Funayama, Yui Takahashi, Akiko Hiramoto, Yusuke Wataya, Hye Sook Kim

Research output: Contribution to journalArticlepeer-review

Abstract

MicroRNAs (miRNAs) are small noncoding RNA molecules that interact with target mRNAs at specific sites to induce cleavage of the mRNA or inhibit translation. Such miRNAs play a vital role in gene expression and in several other biological processes, including cell death. We have studied the mechanisms regulating cell death (necrosis in original F28-7 cells and apoptosis in their variant F28-7-A cells) in the mouse mammary tumor cell line FM3A using the anticancer agent floxuridine (FUdR). We previously reported that inhibition of heat-shock protein 90 by the specific inhibitor geldanamycin (GA) in F28-7 cells causes a shift from necrosis to apoptosis. In this study, we investigated the intracellular miRNA expression profiles of FUdR-treated F28-7 cells (necrotic condition), GA plus FUdR-treated F28-7 cells (apoptotic condition), and FUdR-treated F28-7-A cells (apoptotic condition) through miRNA microarray analysis. In addition, we knocked down Dicer, a key molecule for the expression of mature miRNAs, in F28-7 cells to examine whether it modulates FUdR-induced cell death. Our analysis revealed that the miRNA expression patterns differ significantly between these cell death conditions. Furthermore, we identified miRNA candidates that regulate cell death. Knockdown of Dicer in FUdR-treated necrosis-fated cells caused a partial shift from necrosis to apoptosis. These findings suggest that modulation of miRNA expression patterns influences the decision of cell death fate toward necrosis or apoptosis. Our findings may serve as a basis for further study of the functions of miRNAs in cell death mechanisms.

Original languageEnglish
Pages (from-to)2417-2426
Number of pages10
JournalFEBS Open Bio
Volume10
Issue number11
DOIs
Publication statusPublished - Nov 1 2020

Keywords

  • apoptosis
  • dicer
  • floxuridine
  • geldanamycin
  • microRNA expression
  • necrosis

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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