MiR-9-5p promotes rabbit preadipocyte differentiation by suppressing leptin gene expression

Area of Science:

• Animal Science
• Molecular Biology
• Biochemistry

Background:

• MicroRNAs (miRNAs) are crucial regulators of cell differentiation.
• The specific role of miR-9-5p in adipogenesis, particularly in livestock, is not fully understood.
• Investigating miR-9-5p in rabbit preadipocytes can elucidate mechanisms for high-quality meat production.

Purpose of the Study:

• To investigate the regulatory role of miR-9-5p in rabbit preadipocyte differentiation.
• To identify target genes of miR-9-5p involved in adipogenesis.
• To assess the potential of miR-9-5p for enhancing meat quality in rabbits.

Main Methods:

• Dual-luciferase reporter assay to confirm miR-9-5p targeting of the leptin gene.
• Quantitative reverse transcription PCR (qRT-PCR) and Western blot to analyze gene and protein expression.
• Oil red-O staining and triglyceride content determination to assess lipid accumulation.

Main Results:

• miR-9-5p expression and lipid droplet accumulation were upregulated during rabbit preadipocyte differentiation.
• Overexpression of miR-9-5p enhanced adipogenesis and increased levels of FABP4, C/EBPα, and PPARγ.
• Leptin was validated as a direct target of miR-9-5p, and its knockdown promoted preadipocyte differentiation.

Conclusions:

• miR-9-5p positively regulates white preadipocyte differentiation in rabbits.
• The mechanism involves targeting the leptin gene, suggesting miR-9-5p as a key factor in rabbit adipogenesis.
• This finding has implications for improving meat quality through targeted miRNA manipulation.