Tumor initiating cells induce Cxcr4-mediated infiltration of pro-tumoral macrophages into the brain.

Abstract:

:It is now clear that microglia and macrophages are present in brain tumors, but whether or how they affect initiation and development of tumors is not known. Exploiting the advantages of the zebrafish (Danio rerio) model, we showed that macrophages and microglia respond immediately upon oncogene activation in the brain. Overexpression of human AKT1 within neural cells of larval zebrafish led to a significant increase in the macrophage and microglia populations. By using a combination of transgenic and mutant zebrafish lines, we showed that this increase was caused by the infiltration of peripheral macrophages into the brain mediated via Sdf1b-Cxcr4b signaling. Intriguingly, confocal live imaging reveals highly dynamic interactions between macrophages/microglia and pre-neoplastic cells, which do not result in phagocytosis of pre-neoplastic cells. Finally, depletion of macrophages and microglia resulted in a significant reduction of oncogenic cell proliferation. Thus, macrophages and microglia show tumor promoting functions already during the earliest stages of the developing tumor microenvironment.

journal_name

Elife

journal_title

eLife

authors

Chia K,Mazzolini J,Mione M,Sieger D

doi

10.7554/eLife.31918

subject

Has Abstract

pub_date

2018-02-21 00:00:00

issn

2050-084X

pii

31918

journal_volume

7

pub_type

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