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Convergence of two repressors through heterodimer formation of androgen receptor and testicular orphan receptor-4: a unique signaling pathway in the steroid receptor superfamily.

The androgen receptor (AR) binds to androgen response elements and regulates target genes via a mechanism involving coregulators. Here we demonstrate that the AR can interact with the testicular orphan receptor-4 (TR4) and function as a repressor to down-regulate the TR4 target genes by preventing the TR4 binding to its target DNA. Interestingly, the heterodimerization of AR and TR4 also allows TR4 to repress AR target gene expression. Simultaneous exposure to both receptors therefore could result in bidirectional suppression of their target genes. Together, these data demonstrate that the coupling of two different receptors, through the heterodimerization of AR and TR4, is a unique signaling pathway in the steroid receptor superfamily, which may facilitate further understanding of the complicated androgen action in prostate cancer or libido.

Pubmed ID: 10611280


  • Lee YF
  • Shyr CR
  • Thin TH
  • Lin WJ
  • Chang C


Proceedings of the National Academy of Sciences of the United States of America

Publication Data

December 21, 1999

Associated Grants


Mesh Terms

  • Dimerization
  • Gene Expression Regulation
  • Humans
  • Male
  • Nerve Tissue Proteins
  • Protein Binding
  • Receptors, Androgen
  • Receptors, Steroid
  • Receptors, Thyroid Hormone
  • Recombinant Proteins
  • Repressor Proteins
  • Response Elements
  • Signal Transduction
  • Transcriptional Activation
  • Two-Hybrid System Techniques