Nuclear Factor-Y is an adipogenic factor that regulates leptin gene expression

Area of Science:

• Molecular Biology
• Genetics
• Endocrinology

Background:

• Leptin gene expression correlates with adipocyte lipid content.
• Transcriptional mechanisms governing leptin expression in vivo are not well understood.

Purpose of the Study:

• Identify cis- and trans-regulatory elements controlling leptin expression.
• Investigate the role of Nuclear Factor Y (NF-Y) in leptin regulation and adipocyte function.

Main Methods:

• Utilized Leptin-BAC luciferase transgenic mice for regulatory element identification.
• Employed computational analysis, gel shift assays, ChIP assays, and RNAi.
• Generated adipocyte-specific NF-Y knockout mice for in vivo functional studies.

Main Results:

• Identified a 32 bp sequence containing an NF-Y binding site crucial for leptin reporter activity.
• NF-Y knockdown impaired adipogenesis in vitro.
• Adipocyte-specific NF-Y knockout mice exhibited reduced leptin and fat-specific gene expression, leading to lipodystrophy treatable with leptin.

Conclusions:

• NF-Y is a key regulator of leptin and other adipocyte-specific genes.
• Demonstrated NF-Y's essential role in adipogenesis and maintenance of adipose tissue.
• Identified a novel NF-Y-dependent lipodystrophy model.