Estrogen Receptor α Rapidly Activates the IGF-1 Receptor Pathway*

Estrogen and insulin-like-growth factor 1 (IGF-1) are potent mitogenic stimuli that share important properties in the control of cellular proliferation. However, the coupling between the signaling cascades of estrogen receptors α and β and the IGF-1 receptor (IGF-1R) is poorly understood. Therefore, we selectively transfected estrogen receptor α or β in COS7 and HEK293 cells, which contain IGF-1R. In presence of estrogen receptor α but not β, 17β-estradiol (E2) rapidly induces phosphorylation of the IGF-1R and the extracellular signal-regulated kinases 1/2. Furthermore, upon stimulation with E2, estrogen receptor α but not β bound rapidly to the IGF-1R in COS7 as well as L6 cells, which express all investigated receptors endogenously. Control experiments in the IGF-1R-deficient fibroblast cell line R− showed that after stimulation with E2 only estrogen receptor α bound to the transfected IGF-1R. Overexpression of dominant negative mitogen-activated protein kinases kinase inhibited this effect. Finally, estrogen receptor α but not β is required to induce the activation of the estrogen receptor-responsive reporter ERE-LUC in IGF-1-stimulated cells. Taken together, these data demonstrate that ligand bound estrogen receptor α is required for rapid activation of the IGF-1R signaling cascade.

• Publication year

  2000

• Venue

  Journal of Biological Chemistry

• Publication date

  2000-06-16

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1074/JBC.M910345199PMID 10749889
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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