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Translational activity of mRNA coding for cytoskeletal brain proteins in newborn and adult mice: a comparative study
Abstract:
Translational activity of mRNA coding for cytoskeletal brain proteins was used to determine the relative abundance of the mRNA in the brains of newborn and adult mice. mRNA was translated in a cell-free system containing rabbit reticulocyte factors. The products of translation were analyzed by two-dimensional gel electrophoresis and characterized by peptide map analysis. Comparison of the products of translation from newborn and from adult brain mRNA shows a 50% decrease in actin and tubulin from newborn to the adult stage. In contrast, the 70 kd neurofilament protein and glial fibrillary acidic protein show a twofold increase in the adult stage. The heat-shock protein HSP70 increases slightly (30%) whereas the brain isozyme of creatine kinase and the heat-shock protein HSP90 are three times as high in adult subjects as in newborns.
Insights
Mouse brain development involves significant changes in cytoskeletal protein mRNA levels. Actin and tubulin decrease, while neurofilament and glial proteins increase, highlighting dynamic gene expression shifts.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- The developing brain undergoes significant molecular and cellular changes.
- Cytoskeletal proteins play crucial roles in neuronal structure and function.
- Understanding changes in mRNA abundance is key to deciphering developmental processes.
Purpose of the Study:
- To quantify the relative abundance of mRNA for specific cytoskeletal brain proteins in newborn versus adult mice.
- To investigate age-related changes in the translational activity of brain mRNA.
Main Methods:
- Utilized a cell-free translation system with rabbit reticulocyte factors to translate brain mRNA.
- Analyzed translation products using two-dimensional gel electrophoresis.
- Characterized protein products via peptide map analysis.
Main Results:
- Actin and tubulin mRNA levels decreased by 50% from the newborn to adult stage.
- mRNA for 70 kDa neurofilament protein and glial fibrillary acidic protein doubled in adults.
- Heat-shock proteins HSP70 (slight increase), HSP90, and brain creatine kinase showed significant increases in adults.
Conclusions:
- Significant developmental shifts occur in the abundance of mRNA encoding key cytoskeletal proteins in the mouse brain.
- These changes reflect the distinct structural and functional requirements of the developing versus mature brain.
- Differential regulation of cytoskeletal protein synthesis is a critical aspect of brain maturation.