RNA-binding protein PSPC1 promotes the differentiation-dependent nuclear export of adipocyte RNAs

Area of Science:

• Molecular Biology
• Cell Biology
• Metabolic Research

Background:

• Adipocyte differentiation relies on gene expression, but posttranscriptional regulation is less understood.
• The role of RNA-binding proteins in adipocyte function requires further investigation.

Purpose of the Study:

• To investigate the function of the RNA-binding protein PSPC1 in adipogenesis and adipocyte phenotype.
• To elucidate the mechanism by which PSPC1 influences adipocyte development and function.

Main Methods:

• Cross-linking and immunoprecipitation followed by RNA sequencing (CLIP-seq) to identify PSPC1-bound RNAs.
• Paraspeckle complex purification from adipocytes.
• In vivo studies using mice lacking PSPC1 in adipose tissue.

Main Results:

• PSPC1 binds to intronic and 3'-UTR regions of adipocyte RNAs, including EBF1.
• PSPC1 associates with DDX3X in a differentiation-dependent manner and relocates to the cytoplasm.
• Mice lacking PSPC1 exhibit reduced adipose tissue mass, lipid storage, and resistance to diet-induced obesity and insulin resistance.

Conclusions:

• PSPC1 is crucial for adipogenesis and mature adipocyte function.
• PSPC1-dependent RNA maturation and export are key posttranscriptional mechanisms controlling adipose tissue development and metabolism.
• PSPC1 plays a significant role in regulating energy expenditure and metabolic homeostasis.