Increased expression of both insulin receptor substrates 1 and 2 confers increased sensitivity to IGF-1 stimulated cell migration.

Abstract:

:Insulin-like growth factors (IGFs) are thought to promote tumour progression and metastasis in part by stimulating cell migration. Insulin receptor substrate-1 (IRS-1) and IRS-2 are multisite docking proteins positioned immediately downstream from the type I IGF and insulin receptors. IRS-2 but not IRS-1 has been reported to be involved in the migratory response of breast cancer cells to IGFs. The purpose of this investigation was to determine if IRS-1 is involved in, and to assess the contributions of IRS-1 and IRS-2 to, the migratory response of breast cancer cells to IGFs. The expression of IRS-1 and IRS-2 varied considerably between ten breast cancer cell lines. Oestrogen increases expression of the type I IGF receptor, IRS-1 and IRS-2 in MCF-7 and ZR-75 cells. Oestrogens may control the sensitivity of breast cancer cells to IGFs by regulating the expression of components of the IGF signal transduction pathway. The migratory response to a range of IGF-1 concentrations was measured in MCF-7 and MDA-MB-231 breast cancer cells in which IRS-1 and IRS-2 levels were modulated using a doxycycline-inducible expression system. Induction of both IRS-1 and IRS-2 expression increased the sensitivity of the migratory response to IGF-1 but did not increase the magnitude of the response stimulated at higher concentrations of IGF-1. Knockdown of IRS-1, IRS-2 and the type I IGF receptor in MCF-7 and MDA-MB-2231 cells decreased sensitivity to IGF-1. We conclude that both IRS-1 and IRS-2 control the migratory response of breast cancer cells to IGF-1 and may, therefore, be key molecules in determining breast cancer spread.

journal_name

Endocr Relat Cancer

journal_title

Endocrine-related cancer

authors

de Blaquière GE,May FE,Westley BR

doi

10.1677/ERC-08-0216

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

635-47

issue

2

eissn

1351-0088

issn

1479-6821

pii

ERC-08-0216

journal_volume

16

pub_type

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