Apoptosis induction and growth suppression by U19/Eaf2 is mediated through its ELL-binding domain

Prostate. 2007 Feb 1;67(2):146-53. doi: 10.1002/pros.20481.

Abstract

Background: U19/Eaf2 is an androgen-response gene and its downregulation is frequently observed in advanced human prostate cancer. U19/Eaf2 interacts with ELL, a fusion partner of MLL in the (11;19) (q23;p13.1) translocation in acute myeloid leukemia. U19/Eaf2 overexpression induces apoptosis and suppresses xenograft tumor growth.

Methods: Transfection and colony formation were used to assay for apoptosis and growth suppression of various U19/Eaf2 mutants. Co-immunoprecipitation was performed to test the interaction between the U19/Eaf2 constructs and ELL.

Results: The region of U19/Eaf2 essential for apoptosis and growth suppression was mapped to amino acids 68-113. This region was necessary and sufficient for binding ELL. Co-expression of U19/Eaf2 and ELL in 293 cells lead to significant increase in cell death and growth suppression.

Conclusions: These observations argue that the interaction with ELL is essential for the induction of apoptosis and growth suppression by U19/Eaf2.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Apoptosis / genetics*
  • Cell Line, Tumor
  • Cell Proliferation
  • HeLa Cells
  • Humans
  • Male
  • Peptide Mapping
  • Prostatic Neoplasms / genetics
  • Prostatic Neoplasms / metabolism
  • Prostatic Neoplasms / pathology*
  • Transcription Factors / genetics*
  • Transcription Factors / metabolism
  • Transcriptional Elongation Factors / genetics*
  • Transcriptional Elongation Factors / metabolism
  • Transfection

Substances

  • EAF2 protein, human
  • ELL protein, human
  • Transcription Factors
  • Transcriptional Elongation Factors