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The cholesterol-binding protein NPC2 restrains recruitment of stromal macrophage-lineage cells to early-stage lung tumours

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posted on 2017-01-10, 13:30 authored by Tamihiro Kamata, Hong Jin, Susan Giblett, Bipin Patel, Falguni Patel, Charles Foster, Catrin Pritchard
The tumour microenvironment is known to play an integral role in facilitating cancer progression at advanced stages, but its function in some pre-cancerous lesions remains elusive. We have used the V600EBRAF-driven mouse lung model that develop premalignant lesions to understand stroma–tumour interactions during pre-cancerous development. In this model, we have found that immature macrophage-lineage cells (IMCs) producing PDGFA, TGFβ and CC chemokines are recruited to the stroma of premalignant lung adenomas through CC chemokine receptor 1 (CCR1)-dependent mechanisms. Stromal IMCs promote proliferation and transcriptional alterations suggestive of epithelial–mesenchymal transition in isolated premalignant lung tumour cells ex vivo, and are required for the maintenance of early-stage lung tumours in vivo. Furthermore, we have found that IMC recruitment to the microenvironment is restrained by the cholesterol-binding protein, Niemann-Pick type C2 (NPC2). Studies on isolated cells ex vivo confirm that NPC2 is secreted from tumour cells and is taken up by IMCs wherein it suppresses secretion of the CCR1 ligand CC chemokine 6 (CCL6), at least in part by facilitating its lysosomal degradation. Together, these findings show that NPC2 secreted by premalignant lung tumours suppresses IMC recruitment to the microenvironment in a paracrine manner, thus identifying a novel target for the development of chemopreventive strategies in lung cancer.

Funding

This work was funded by Cancer Research UK Programme grants (Ref C1362/A6969 and C1362/A13083). C.P. was also funded by a Royal Society‐Wolfson Research Merit Award. We are indebted to the Department of Biomedical Services and the Advanced Imaging Facilities and Protein Nucleic Acid Chemistry Laboratory within Core Biotechnology Services at Leicester. We are also extremely grateful to Peter Lobel for providing the Npc2‐mutant mice and NPC2‐Alexa488.

History

Citation

EMBO Molecular Medicine (2015) 7, 1119-1137

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/School of Medicine/Department of Cancer Studies and Molecular Medicine

Version

  • VoR (Version of Record)

Published in

EMBO Molecular Medicine (2015) 7

Publisher

Wiley Open Access with European Molecular Biology Organization (EMBO)

issn

1757-4676

eissn

1757-4684

Acceptance date

2015-06-18

Copyright date

2015

Available date

2017-01-10

Publisher version

http://embomolmed.embopress.org/content/7/9/1119

Notes

Supplementary information for this article is available online: http://embomolmed.embopress.org

Language

en

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