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Molecular mechanism of a cross-talk between estrogen and growth-factor signaling pathways

S Kato1, T Kitamoto, Y Masuhiro

  • 1Institute of Molecular and Cellular Biosciences, University of Tokyo, Tokyo, Japan. uskato@hongo.ecc.u-tokyo.ac.jp

Oncology
|December 16, 1998
PubMed

Insights

Estrogen (E2) actions involve its receptor (ER). Growth factors enhance E2

Area of Science:

  • Molecular Endocrinology
  • Cancer Biology
  • Signal Transduction

Background:

  • Estrogen (E2) exerts its effects via the nuclear estrogen receptor (ER).
  • Growth factors can synergize with E2 in cancer development.
  • Cross-talk between E2 and growth factor signaling pathways is crucial in biological processes.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying the cross-talk between estrogen and growth factor signaling pathways.
  • To investigate how growth factor-activated signaling affects estrogen receptor (ER) function.

Main Methods:

  • Focuses on the phosphorylation of human ERalpha by mitogen-activated protein kinase (MAPK).
  • Discusses the functional consequences of this phosphorylation event on ERalpha transactivation.
  • Reviews the molecular interplay between growth factor and E2 signaling.

Main Results:

  • Growth factor-activated mitogen-activated protein kinase phosphorylates human ERalpha.
  • This phosphorylation enhances the transactivation function of human ERalpha.
  • Demonstrates a novel cross-talk mechanism between E2 and growth factor signaling.

Conclusions:

  • Estrogen and growth factor signaling pathways exhibit significant cross-talk.
  • Phosphorylation of ERalpha by MAPK is a key mechanism in this cross-talk.
  • Understanding this interaction is vital for cancer research and therapeutic strategies.

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