Characterization of the Fasting-induced Adipose Factor FIAF, a Novel Peroxisome Proliferator-activated Receptor Target Gene*

Fasting is associated with significant changes in nutrient metabolism, many of which are governed by transcription factors that regulate the expression of rate-limiting enzymes. One factor that plays an important role in the metabolic response to fasting is the peroxisome proliferator-activated receptor α (PPARα). To gain more insight into the role of PPARα during fasting, and into the regulation of metabolism during fasting in general, a search for unknown PPARα target genes was performed. Using subtractive hybridization (SABRE) comparing liver mRNA from wild-type and PPARα null mice, we isolated a novel PPARα target gene, encoding the secreted protein FIAF (for fasting induced adipose factor), that belongs to the family of fibrinogen/angiopoietin-like proteins. FIAF is predominantly expressed in adipose tissue and is strongly up-regulated by fasting in white adipose tissue and liver. Moreover, FIAF mRNA is decreased in white adipose tissue of PPARγ +/− mice. FIAF protein can be detected in various tissues and in blood plasma, suggesting that FIAF has an endocrine function. Its plasma abundance is increased by fasting and decreased by chronic high fat feeding. The data suggest that FIAF represents a novel endocrine signal involved in the regulation of metabolism, especially under fasting conditions.

• Publication year

  2000

• Venue

  Journal of Biological Chemistry

• Publication date

  2000-09-15

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/JBC.M004029200PMID 10862772
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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