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The obligatory intestinal folate transporter PCFT (SLC46A1) is regulated by nuclear respiratory factor 1

Nitzan Gonen1, Yehuda G Assaraf

  • 1Fred Wyszkowski Cancer Research Laboratory, Faculty of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.

The Journal of Biological Chemistry
|August 21, 2010
PubMed

Insights

Nuclear Respiratory Factor 1 (NRF-1) activates the proton-coupled folate transporter (PCFT) gene, crucial for folate absorption. This discovery links folate transport regulation to cellular energy pathways.

Area of Science:

  • Molecular Biology
  • Nutritional Biochemistry
  • Genetics

Background:

  • Folates are vital for DNA synthesis and cellular metabolism.
  • The proton-coupled folate transporter (PCFT) is essential for intestinal folate absorption.
  • PCFT mutations cause hereditary folate malabsorption, leading to severe health issues.

Purpose of the Study:

  • To investigate the role of inducible trans-activators in PCFT gene expression.
  • To identify regulatory elements and transcription factors controlling PCFT.
  • To explore the connection between folate transport and cellular energy regulation.

Main Methods:

  • Bioinformatic analysis to predict transcription factor binding sites.
  • Electrophoretic mobility shift assays (EMSA) to confirm NRF-1 binding.
  • Chromatin immunoprecipitation (ChIP) to validate NRF-1 interaction with the PCFT promoter.
  • Luciferase reporter assays to assess promoter activity.
  • Gene silencing techniques (siRNA) to evaluate NRF-1 function.
  • Analysis of downstream gene expression.

Main Results:

  • Three NRF-1 binding sites were identified in the PCFT promoter.
  • NRF-1 directly binds to these sites, activating PCFT gene expression.
  • Overexpression of NRF-1 increased PCFT mRNA levels, while NRF-1 inhibition decreased them.
  • NRF-1 silencing also affected genes involved in folate metabolism and mitochondrial function.

Conclusions:

  • NRF-1 is a key inducible transcriptional regulator of the PCFT gene.
  • This finding establishes a link between folate transport, folate metabolism, and mitochondrial biogenesis.
  • Understanding PCFT regulation by NRF-1 may offer new therapeutic strategies for folate malabsorption disorders.

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