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Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
09:33

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules

Published on: May 12, 2017

Dynamic association-dissociation and harboring of endogenous mRNAs in stress granules

Junwei Zhang1, Kohki Okabe, Tokio Tani

  • 1Laboratory of Bio-Analytical Chemistry, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of Cell Science
|December 3, 2011
PubMed

Insights

Researchers visualized mRNA dynamics in stress granules (SGs) using novel RNA probes. They found mRNAs in SGs exhibit distinct mobile and immobile behaviors, revealing SGs as dynamic mRNA storage sites.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cytoplasmic mRNAs form stress granules (SGs) under environmental stress.
  • Previous studies on SG mRNA behavior relied on indirect protein markers, leaving endogenous mRNA dynamics uncertain.

Purpose of the Study:

  • To visualize and analyze the real-time behavior of endogenous mRNAs within stress granules in living mammalian cells.
  • To characterize the dynamics of mRNA aggregation and dissociation in SGs.

Main Methods:

  • Utilized a linear antisense 2'-O-methyl RNA probe to visualize endogenous cytoplasmic poly(A)(+) mRNAs in real-time.
  • Employed fluorescence recovery after photobleaching (FRAP) to analyze mRNA dynamics within SGs.
  • Colocalized observed mRNA granules with stress granules marked by TIA-1-GFP.

Main Results:

  • Endogenous mRNAs were observed to aggregate in granules colocalizing with TIA-1-GFP marked SGs under arsenite stress.
  • FRAP analysis revealed approximately one-third of mRNAs in SGs were immobile, one-third diffusive, and one-third in dynamic equilibrium.
  • mRNA dynamics within SGs were independent of stress duration and microtubule integrity.
  • Similar dynamic characteristics were observed for fos mRNA.

Conclusions:

  • Stress granules serve as dynamic harbors for untranslated poly(A)(+) mRNAs.
  • This study provides direct visualization and dynamic characterization of endogenous mRNA behavior within SGs.
  • The findings offer new insights into mRNA regulation and storage under cellular stress.

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