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MiR-223 regulates the differentiation of immature neurons.

ABSTRACT: Small non-coding microRNA RNA molecules can regulate stem cell function. The role of microRNAs in neural stem/progenitor cells (NS/PCs) differentiation is not entirely clear. MiRNA profiling, loss and gain of function studies coupled with dendritic tree development morphometric analysis and calcium influx imaging were utilized to investigate the role of micoRNA-223 in differentiating NS/PCs. MiRNA profiling in human NS/PCs before and after differentiation in vitro reveals modulation of miRNAs following differentiation of NS/PCs. MiR-223, a microRNA well characterized as a hematopoietic-specific miRNA was identified. Cell-autonomous inhibition of miR-223 in the adult mouse dentate gyrus NS/PCs led to a significant increase in immature neurons soma size, dendritic tree total length, branch number per neuron and complexity, while neuronal migration in the dentate gyrus remained unaffected. Overexpression of miR-223 decreased dendritic tree total length, branch number and complexity in neurons differentiated from human embryonic stem cells (hESCs). Inhibition of miR-223 enhanced N-methyl-D-aspartate (NMDA) induced calcium influx in human neurons differentiated from NS/PCs. Taken together, these findings indicate that miR-223 regulates the differentiation of neurons derived from NS/PCs.

SUBMITTER: Harraz MM

PROVIDER: S-EPMC4229944 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature

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MiR-223 regulates the differentiation of immature neurons.

Harraz Maged M MM Xu Jin-Chong JC Guiberson Noah N Dawson Ted M TM Dawson Valina L VL

Molecular and cellular therapies 20140601 18

<h4>Background</h4>Small non-coding microRNA RNA molecules can regulate stem cell function. The role of microRNAs in neural stem/progenitor cells (NS/PCs) differentiation is not entirely clear.<h4>Methods</h4>MiRNA profiling, loss and gain of function studies coupled with dendritic tree development morphometric analysis and calcium influx imaging were utilized to investigate the role of micoRNA-223 in differentiating NS/PCs.<h4>Results</h4>MiRNA profiling in human NS/PCs before and after differe ...[more]

PMID: 25400937

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Project description:Microvesicles (MV) are small membrane-bound particles comprised of exosomes and various sized extracellular vesicles. These are released by a number of cell types. Microvesicles have a variety of cellular functions from communication to mediating growth and differentiation. Microvesicles contain proteins and nucleic acids. Previously, we showed that plasma microvesicles contain microRNAs (miRNAs). Based on our previous report, the majority of peripheral blood microvesicles are derived from platelets while mononuclear phagocytes, including macrophages, are the second most abundant population. Here, we characterized macrophage-derived microvesicles and whether they influenced the differentiation of naM-CM-/ve monocytes. We also identified the miRNA content of the macrophage-derived microvesicles. We found that RNA molecules contained in the macrophage-derived microvesicles were transported to target cells, including monocytes, endothelial cells, epithelial cells and fibroblasts. Furthermore, we found that miR-223 was transported to target cells and was functionally active. Based on our observations, we hypothesize that microvesicles bind to and activate target cells. Furthermore, we find that microvesicles induce the differentiation of macrophages. Thus, defining key components of this response may identify novel targets to regulate host defense and inflammation. We used GeneChip microarrays to examine changes in gene expression induced by MV in primary monocyte-derived macrophages (MDM) and in THP1 cells, and compare this to cells treated with GM-CSF and PMA, respectively. All experiments were done in triplicates. Primary monocytes were collected from buffy coats (BC). The freshly isolated monocytes from three donors (Mono1-3) were either treated with GM-CSF or subjected to RNA isolation. Following treatment, MVs were isolated from the GM-CSF-treated macrophage cultures. RNA was isolated from the remaining cells for profiling (GM1-3). The isolated MVs were then used to treat new BC monocytes for 24 h (BC-GMCSF-MV24). A fraction of the new BC monocytes was subjected to RNA extraction for profiling (BC1-3). For THP1 cells, they were treated with either DMSO or PMA to produce MVs. The MVs were collected and the remaining cells lyzed for RNA extraction and profiling (DMSO1-3 and PMA1-3). The collected MVs from the DMSO or PMA-treated THP1 cells were incubated with new THP1 for 24 h and designated DMSO-MV24 or PMA-MV24. We had a total of 24 samples.

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MiR-223 regulates the differentiation of immature neurons.

Publications

MiR-223 regulates the differentiation of immature neurons.

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