Reactive astrocytes promote the metastatic growth of breast cancer stem-like cells by activating Notch signalling in brain.

Abstract:

:Brain metastasis of breast cancer profoundly affects the cognitive and sensory functions as well as morbidity of patients, and the 1 year survival rate among these patients remains less than 20%. However, the pathological mechanism of brain metastasis is as yet poorly understood. In this report, we found that metastatic breast tumour cells in the brain highly expressed IL-1β which then 'activated' surrounding astrocytes. This activation significantly augmented the expression of JAG1 in the astrocytes, and the direct interaction of the reactivated astrocytes and cancer stem-like cells (CSCs) significantly stimulated Notch signalling in CSCs. We also found that the activated Notch signalling in CSCs up-regulated HES5 followed by promoting self-renewal of CSCs. Furthermore, we have shown that the blood-brain barrier permeable Notch inhibitor, Compound E, can significantly suppress the brain metastasis in vivo. These results represent a novel paradigm for the understanding of how metastatic breast CSCs re-establish their niche for their self-renewal in a totally different microenvironment, which opens a new avenue to identify a novel and specific target for the brain metastatic disease.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Xing F,Kobayashi A,Okuda H,Watabe M,Pai SK,Pandey PR,Hirota S,Wilber A,Mo YY,Moore BE,Liu W,Fukuda K,Iiizumi M,Sharma S,Liu Y,Wu K,Peralta E,Watabe K

doi

10.1002/emmm.201201623

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

384-96

issue

3

eissn

1757-4676

issn

1757-4684

journal_volume

5

pub_type

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