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Current Pharmaceutical Design

Editor-in-Chief

ISSN (Print): 1381-6128
ISSN (Online): 1873-4286

Crosstalk between IGF Signaling and Steroid Hormone Receptors in Breast Cancer

Author(s): Diego Sisci and Eva Surmacz

Volume 13, Issue 7, 2007

Page: [705 - 717] Pages: 13

DOI: 10.2174/138161207780249182

Price: $65

Abstract

Breast cancer development and progression is regulated by crosstalk between steroid hormones (SHs) (e.g., estrogens, progestins and androgens) and growth factors such as insulin-like growth factors (IGFs), insulin, epidermal growth factors (EGFs), transforming growth factors, and vascular endothelial growth factor. The biological effects of SHs are mediated by the nuclear receptors acting as transcriptional activators. Steroid hormone receptors (SRs), in addition to being induced by their own ligands, are also regulated by cellular kinases activated by growth factors. Growth factors are known to influence the expression and activity of SRs as well as regulate the action of various SR transcriptional cofactors. In turn, the expression of growth factor receptors, their ligands, and signaling molecules is often controlled by SHs. This review will focus on crosstalk between the IGF-I system and several SRs implicated in breast cancer.

Keywords: C-terminal LBD, AF1 (activation function 1), cyclin D1 protein expression, Progestins, Androgens, Src homology 2


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