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Differentiation of a Human Neural Stem Cell Line on Three Dimensional Cultures, Analysis of MicroRNA and Putative Target Genes
Published on: April 12, 2015
Apoptosis-associated microRNAs are modulated in mouse, rat and human neural differentiation
Márcia M Aranha1, Daniela M Santos, Joana M Xavier
1Research Institute for Medicines and Pharmaceutical Sciences, Faculty of Pharmacy, University of Lisbon, Lisbon 1649-003, Portugal.
Background:
MicroRNAs (miRs or miRNAs) regulate several biological processes in the cell. However, evidence for miRNAs that control the differentiation program of specific neural cell types has been elusive. Recently, we have shown that apoptosis-associated factors, such as p53 and caspases participate in the differentiation process of mouse neural stem (NS) cells. To identify apoptosis-associated miRNAs that might play a role in neuronal development, we performed global miRNA expression profiling experiments in NS cells. Next, we characterized the expression of proapoptotic miRNAs, including miR-16, let-7a and miR-34a in distinct models of neural differentiation, including mouse embryonic stem cells, PC12 and NT2N cells. In addition, the expression of antiapoptotic miR-19a and 20a was also evaluated.
Results:
The expression of miR-16, let-7a and miR-34a was consistently upregulated in neural differentiation models. In contrast, expression of miR-19a and miR-20a was downregulated in mouse NS cell differentiation. Importantly, differential expression of specific apoptosis-related miRNAs was not associated with increased cell death. Overexpression of miR-34a increased the proportion of postmitotic neurons of mouse NS cells.
Conclusions:
In conclusion, the identification of miR-16, let-7a and miR-34a, whose expression patterns are conserved in mouse, rat and human neural differentiation, implicates these specific miRNAs in mammalian neuronal development. The results provide new insights into the regulation of neuronal differentiation by apoptosis-associated miRNAs.
Insights
Specific microRNAs (miRNAs) linked to apoptosis are crucial for mammalian neuronal development. Upregulated proapoptotic miRNAs like miR-34a promote neuron differentiation without increasing cell death.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) regulate cellular processes, but their role in neural cell differentiation is not fully understood.
- Apoptosis-associated factors, including p53 and caspases, are involved in mouse neural stem cell differentiation.
- Previous research suggested a potential role for miRNAs in this process.
Purpose of the Study:
- To identify apoptosis-associated miRNAs involved in neural development.
- To characterize the expression of specific proapoptotic and antiapoptotic miRNAs during neural differentiation.
Main Methods:
- Global miRNA expression profiling in mouse neural stem (NS) cells.
- Expression analysis of selected miRNAs (miR-16, let-7a, miR-34a, miR-19a, miR-20a) in various neural differentiation models (mouse ES cells, PC12, NT2N).
- Functional assessment of miR-34a in promoting neuronal differentiation.
Main Results:
- Proapoptotic miRNAs (miR-16, let-7a, miR-34a) were upregulated during neural differentiation.
- Antiapoptotic miRNAs (miR-19a, miR-20a) were downregulated in mouse NS cell differentiation.
- Differential miRNA expression did not correlate with increased cell death; miR-34a overexpression enhanced postmitotic neuron production.
Conclusions:
- miR-16, let-7a, and miR-34a expression patterns are conserved across mouse, rat, and human neural differentiation.
- These miRNAs are implicated in mammalian neuronal development.
- The study provides novel insights into the regulation of neuronal differentiation by apoptosis-associated miRNAs.
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