Gata6+ resident peritoneal macrophages promote the growth of liver metastasis

Mokarram Hossain, Raymond Shim, Woo-Yong Lee, Arlene H. Sharpe and Paul Kubes ()
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Mokarram Hossain: University of Calgary
Raymond Shim: University of Calgary
Woo-Yong Lee: University of Calgary
Arlene H. Sharpe: Blavatnik Institute, Harvard Medical School, and Evergrande Centre for Immunological Diseases, Harvard Medical School and Brigham and Women’s Hospital
Paul Kubes: University of Calgary

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Emerging evidence suggests that resident macrophages within tissues are enablers of tumor growth. However, a second population of resident macrophages surrounds all visceral organs within the cavities and nothing is known about these GATA6+ large peritoneal macrophages (GLPMs) despite their ability to invade injured visceral organs by sensing danger signals. Here, we show that GLPMs invade growing metastases that breach the visceral mesothelium of the liver via the “find me signal”, ATP. Depleting GLPMs either by pharmacological or genetic tools, reduces metastases growth. Apoptotic bodies from tumor cells induces programmed cell death ligand 1 (PD-L1) upregulation on GLPMs which block CD8+ T cell function. Direct targeting of GLPMs by intraperitoneal but not intravenous administration of anti-PD-L1 reduces tumor growth. Thermal ablation of liver metastases recruits huge numbers of GLPMs and enables rapid regrowth of tumors. GLPMs contribute to metastatic growth and tumor recurrence.

Date: 2022
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DOI: 10.1038/s41467-022-32080-y

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