Estrogen receptor inducibility of the human Na+/H+ exchanger regulatory factor/ezrin-radixin-moesin binding protein 50 (NHE-RF/EBP50) gene involving multiple half-estrogen response elements

Mol Endocrinol. 2002 Aug;16(8):1828-39. doi: 10.1210/me.2001-0290.


The Na+/H+ exchanger regulatory factor (NHE-RF; also known as ezrin-radixin-moesin binding protein 50) is a primary response gene under estrogen receptor (ER) control that may provide a link between estrogen action and the regulation of cytoskeletal and cell-signaling pathways. These studies were undertaken to define the human NHE-RF genomic regions and regulatory sequences mediating its robust estrogen responsiveness. Screening of a human genomic library yielded NHE-RF clones comprising the full gene, including the 5'-regulatory region and first exon, which were found to contain a large number (13) of consensus half-estrogen response elements (EREs), but to lack palindromic full EREs. Transfection-transactivation assays with wild-type and mutant ERs and reporter gene constructs linked to progressive deletions, or containing mutations, of the 5'-flanking region including a portion of exon I, and electrophoretic mobility and competitive gel shift assays were performed. These demonstrated direct ER interaction with the multiple half-ERE sites and the importance of the one proximal half-ERE and the multiple upstream half-EREs for eliciting the robust transcription activation of the NHE-RF gene by the estrogen-ER complex. Our findings highlight a paradigm for gene regulation via numerous half-ERE sites that expands the range of modes by which DNA recognition sites mediate the actions of this nuclear receptor.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Binding Sites / genetics
  • Carrier Proteins / genetics*
  • Cell Line
  • DNA, Complementary / genetics
  • DNA, Complementary / metabolism
  • Exons
  • Genes, Regulator
  • Humans
  • In Vitro Techniques
  • Molecular Sequence Data
  • Phosphoproteins / genetics*
  • Promoter Regions, Genetic
  • Receptors, Estrogen / metabolism*
  • Sodium-Hydrogen Exchangers / metabolism
  • Sp1 Transcription Factor / metabolism


  • Carrier Proteins
  • DNA, Complementary
  • Phosphoproteins
  • Receptors, Estrogen
  • Sodium-Hydrogen Exchangers
  • Sp1 Transcription Factor
  • sodium-hydrogen exchanger regulatory factor