Annexin-A1 enhances breast cancer growth and migration by promoting alternative macrophage polarization in the tumour microenvironment.

Abstract:

:Macrophages are potent immune cells with well-established roles in the response to stress, injury, infection and inflammation. The classically activated macrophages (M1) are induced by lipopolysaccharide (LPS) and express a wide range of pro-inflammatory genes. M2 macrophages are induced by T helper type 2 cytokines such as interleukin-4 (IL4) and express high levels of anti-inflammatory and tissue repair genes. The strong association between macrophages and tumour cells as well as the high incidences of leukocyte infiltration in solid tumours have contributed to the discovery that tumour-associated macrophages (TAMs) are key to tumour progression. Here, we investigated the role of Annexin A1 (ANXA1), a well characterized immunomodulatory protein on macrophage polarization and the interaction between macrophages and breast cancer cells. Our results demonstrate that ANXA1 regulates macrophage polarization and activation. ANXA1 can act dually as an endogenous signalling molecule or as a secreted mediator which acts via its receptor, FPR2, to promote macrophage polarization. Furthermore, ANXA1 deficient mice exhibit reduced tumour growth and enhanced survival in vivo, possibly due to increased M1 macrophages within the tumor microenvironment. These results provide new insights into the molecular mechanisms of macrophage polarization with therapeutic potential to suppress breast cancer growth and metastasis.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Moraes LA,Kar S,Foo SL,Gu T,Toh YQ,Ampomah PB,Sachaphibulkij K,Yap G,Zharkova O,Lukman HM,Fairhurst AM,Kumar AP,Lim LHK

doi

10.1038/s41598-017-17622-5

subject

Has Abstract

pub_date

2017-12-20 00:00:00

pages

17925

issue

1

issn

2045-2322

pii

10.1038/s41598-017-17622-5

journal_volume

7

pub_type

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