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08:26
A Quantitative Cell Migration Assay for Murine Enteric Neural Progenitors
Published on: September 18, 2013
MicroRNAs dynamically remodel gastrointestinal smooth muscle cells
Chanjae Park1, Wei Yan, Sean M Ward
1Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada, United States of America.
Plos One
|May 3, 2011
Summary
Smooth muscle cell (SMC) microRNAs (miRNAs) are essential for gastrointestinal tract development and function. Loss of SMC miRNAs leads to intestinal dilation and impaired muscle function, highlighting their critical role in SMC survival.
Area of Science:
- Molecular Biology
- Developmental Biology
- Gastroenterology
Background:
- Smooth muscle cells (SMCs) rely on specific microRNAs (miRNAs) to maintain their differentiated state.
- The precise role of miRNAs in gastrointestinal (GI) SMC development remains incompletely understood.
Purpose of the Study:
- To investigate the function of miRNAs in the development of GI SMCs.
- To elucidate the regulatory network involving miRNAs, transcription factors, and SMC phenotype.
Main Methods:
- Generation of SMC-specific Dicer knockout transgenic mice.
- Analysis of phenotypic, functional, and global gene expression changes in mutant SMCs.
- miRNA profiling and bioinformatic analyses.
Main Results:
- SMC-specific Dicer knockout abolished miRNA biogenesis, leading to significant alterations in SMCs.
- Mutant mice exhibited intestinal dilation, thinned smooth muscle layers, and reduced contractile motility.
- Down-regulation of contractile genes and transcriptional regulators was observed in mutant SMCs.
Conclusions:
- SMC-specific miRNAs are crucial for the proper development and survival of SMCs in the GI tract.
- A complex feedback network involving SMC miRNAs, serum response factor (SRF), and other factors regulates SMC phenotype.
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