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Detection of MicroRNAs in Microglia by Real-time PCR in Normal CNS and During Neuroinflammation

Detection of MicroRNAs in Microglia by Real-time PCR in Normal CNS and During Neuroinflammation

Published on: July 23, 2012

microRNA-124 is down regulated in nerve-injured motor neurons and it potentially targets mRNAs for KLF6 and STAT3

K Nagata¹, I Hama², S Kiryu-Seo³

¹Laboratory for Proteolytic Neuroscience, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

|November 5, 2013

Abstract:

MicroRNA (miRNA) is a small non-coding RNA that regulates gene expression by degrading target mRNAs or inhibiting translation. Although many miRNAs play important roles in various conditions, it is unclear whether miRNAs are involved in motor nerve regeneration. In this study, we identified the possible implication of miR-124 in nerve regeneration using a mouse hypoglossal nerve injury model. The significant down-regulation of miR-124 was observed in injured hypoglossal motor neurons after nerve injury, and this transient down-regulation showed a clear inverse correlation with the up-regulation of KLF6 and STAT3, known as axon elongation factor and regeneration-associated molecules, respectively. Furthermore, the luciferase assay and in vitro gain of function methods supported that both genes could be potent targets of miR-124. These results suggest that injury-induced repression of miR-124 may be implicated in the regulation of expression of several injury-associated transcription factors, which are crucial for appropriate nerve regeneration.

Insights

MicroRNA-124 (miR-124) levels decrease after motor nerve injury, impacting regeneration. This study suggests miR-124 regulates key factors like KLF6 and STAT3, crucial for nerve repair.

Area of Science:

Molecular Biology
Neuroscience
Genetics

Background:

MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression.
The role of miRNAs in motor nerve regeneration remains largely unknown.
Investigating specific miRNAs like miR-124 is crucial for understanding nerve repair mechanisms.

Purpose of the Study:

To investigate the involvement of miR-124 in motor nerve regeneration.
To explore the relationship between miR-124, KLF6, and STAT3 in nerve injury.

Main Methods:

Utilized a mouse hypoglossal nerve injury model.
Quantified miR-124 expression in injured motor neurons.
Performed luciferase assays and in vitro gain-of-function studies.

Main Results:

Observed significant down-regulation of miR-124 in injured hypoglossal motor neurons.
Found an inverse correlation between miR-124 down-regulation and KLF6/STAT3 up-regulation.
Confirmed KLF6 and STAT3 as potential targets of miR-124.

Conclusions:

Injury-induced repression of miR-124 may regulate transcription factors essential for nerve regeneration.
miR-124 plays a potential role in modulating gene expression during motor nerve repair.
Findings provide insights into the molecular mechanisms governing nerve regeneration.

Read full analysis

Keywords:

3′-UTR 3′-untranslated region CT IL6 receptor IL6R ISH KLF6 Krüppel-like factor 6 STAT3 cycle threshold expression regulation hypoglossal nerve in situ hybridization histochemistry miRNA microRNA nerve injury neuronal regeneration signal transducer and activator of transcription 3 transcription factor

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...

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