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Published on: May 19, 2016
A Rho-dependent signaling pathway operating through myosin localizes beta-actin mRNA in fibroblasts
V M Latham1, E H Yu, A N Tullio
1Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Cellular signals direct beta-actin mRNA localization via a Rho-mediated pathway involving myosin II-B. This process is crucial for cell asymmetry and motility in fibroblasts.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- mRNA sorting is critical for establishing cell asymmetry.
- The specific signals governing RNA localization remain largely unknown.
- Beta-actin mRNA is known to localize to the leading edge of fibroblasts, influencing cell motility.
Purpose of the Study:
- To elucidate the signaling pathway regulating beta-actin mRNA localization in fibroblasts.
- To identify the molecular mechanisms controlling spatial gene expression.
Main Methods:
- Investigated the role of Rho GTPase and Rho-kinase signaling.
- Utilized inhibition of myosin ATPase and myosin light chain kinase (MLCK).
- Examined beta-actin mRNA localization in myosin II-B knockout mouse embryonic fibroblasts.
Main Results:
- A signaling pathway involving extracellular receptors, Rho GTPase, and Rho-kinase regulates beta-actin mRNA localization.
- Inhibition of myosin ATPase, MLCK, or knockout of myosin II-B disrupted beta-actin mRNA localization.
- Actomyosin interactions are essential for growth factor-induced mRNA localization.
Conclusions:
- Beta-actin mRNA sorting in fibroblasts depends on a Rho-mediated pathway.
- Myosin II-B plays a critical role in this mRNA localization process.
- Polarized actin bundles likely guide mRNA to the cell's leading edge.
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