Semin Reprod Med 2007; 25(3): 187-197
DOI: 10.1055/s-2007-973431
Copyright © 2007 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA.

Membrane-Initiated Steroid Signaling Action of Estrogen and Breast Cancer

Robert X.-D Song1
  • 1Department of Internal Medicine, University of Virginia School of Medicine, Charlottesville, Virginia
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Publication History

Publication Date:
20 April 2007 (online)

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ABSTRACT

Although classical concepts had assigned priority to the nuclear-initiated steroid signaling pathway of estrogen receptor (ER), recent studies document that the ER also possesses the membrane-initiated steroid signaling (MISS) pathway. A small fraction of ER is associated with the cell membrane and mediates the rapid effects of estrogen. Unlike classical growth factor receptors, such as insulinlike growth factor 1 receptor and epidermal growth factor receptor, ER has no transmembrane and kinase domains. Instead, the initiating signals of MISS action of ER require a rapid formation of ER-centered protein complexes with many signaling molecules, leading to the activation of mitogen-activated protein kinase and Akt signaling pathways. In this review, we focus on the MISS action of ER and its role in the development of hormone resistance in breast cancer. A full understanding of the mechanisms, with the ultimate aim of abrogating specific steps, should lead to more targeted strategies for treatment of hormone-dependent breast cancer.

REFERENCES

Robert X.-D SongPh.D. 

Division of Endocrinology, University of Virginia Health Science Center

Charlottesville, VA 22908

Email: rs5wf@virginia.edu