mir-127-3p inhibits the proliferation of myocytes by targeting KMT5a

Area of Science:

• Molecular Biology
• Gene Regulation
• Muscle Development

Background:

• MicroRNAs (miRNAs) are key post-transcriptional regulators of gene expression.
• While several miRNAs are known to influence skeletal muscle development, the role of miR-127-3p remains largely uncharacterized.
• Previous studies indicated high expression of miR-127-3p in porcine fetal skeletal muscle.

Purpose of the Study:

• To investigate the function of miR-127-3p in muscle cell proliferation and differentiation.
• To identify the molecular targets and mechanisms underlying miR-127-3p's role in myocytes.

Main Methods:

• Quantification of miR-127-3p expression in mouse skeletal and cardiac muscle, and C2C12 cell lines.
• Overexpression of miR-127-3p in C2C12 cells to assess effects on proliferation and differentiation.
• Identification and validation of KMT5a as a direct target gene using mRNA and protein analysis.
• Rescue experiments involving KMT5a overexpression in miR-127-3p treated cells.

Main Results:

• miR-127-3p was highly expressed in adult mouse skeletal and cardiac muscle, and proliferating C2C12 cells.
• Overexpression of miR-127-3p significantly inhibited C2C12 cell proliferation but did not affect differentiation.
• KMT5a was identified as a direct target, with its mRNA and protein levels reduced by miR-127-3p.
• KMT5a re-expression rescued the inhibitory effect of miR-127-3p on C2C12 cell proliferation.

Conclusions:

• miR-127-3p plays a significant role in regulating myocyte proliferation.
• The mechanism involves the down-regulation of its target gene, KMT5a.
• This study elucidates a novel function of miR-127-3p in muscle cell biology.