Exosome can prevent RNase from degrading microRNA in feces

Yoshikatsu Koga, Masahiro Yasunaga, Yoshihiro Moriya, Takayuki Akasu, Shin Fujita, Seiichiro Yamamoto, Yasuhiro Matsumura


Background: Because the stability of miRNA in feces has not been clarified, we examined the stability of miRNA in feces.
Methods: RNase was added into culture media of HT-29 cells and fecal homogenates. The relative quantifications of miRNA were analyzed by real-time RT-PCR.
Results: Cellular miRNA or exosomal miRNA were protected from RNase by the cellular membrane or the exosome; meanwhile, free miRNA was degraded immediately and completely by RNase.
Conclusion: The present study revealed that exosome or cellular membrane could prevent RNase from degrading miRNA inside the exosome or cells even in a dreadful condition, as in feces.