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RNA trafficking in axons
Jose R Sotelo-Silveira1, Aldo Calliari, Alejandra Kun
1Department of Proteins and Nucleic Acids, Instituto de Investigaciones Biologicas Clemente Estable, Montevideo, Uruguay. sotelo@iibce.edu.uy
Traffic (Copenhagen, Denmark)
|April 29, 2006
Summary
Axons actively synthesize proteins locally using transported mRNAs and ribosomes. These findings highlight the importance of axonal transport and local translation in neuronal function.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Decades of research show axons contain mRNAs and ribosomes, indicating local protein synthesis.
- Recent focus on subcellular mRNA targeting and translation in polarized cells supports axonal mRNA targeting.
- Ribonucleoprotein (RNP) complexes, guided by trans-acting factors, mediate mRNA targeting in neurons.
Purpose of the Study:
- To review and synthesize evidence for local protein synthesis in axons.
- To discuss the mechanisms of mRNA and ribosome transport within axons.
- To explore the functional significance of localized translation in axonal domains.
Main Methods:
- Review of existing literature on axonal mRNA and protein synthesis.
- Discussion of in vitro studies on molecular motor-mediated RNP transport.
- Analysis of ultrastructural observations of periaxoplasmic ribosomal plaques (PARPs).
Main Results:
- Axons are metabolically active, synthesizing proteins locally via transported mRNAs and ribosomes.
- Molecular motors (kinesins, myosins) likely transport mRNAs as RNPs within axons.
- Periaxoplasmic ribosomal plaques (PARPs) are identified as potential local translation centers in myelinated axons.
Conclusions:
- Axons possess sophisticated machinery for local mRNA targeting and protein synthesis.
- PARPs represent crucial sites for localized translation, serving as destinations for axonal macromolecular traffic.
- Glial cells may contribute to axonal mRNA and ribosome content via trans-endocytosis.