PLX3397 inhibits the accumulation of intra-tumoral macrophages and improves bromodomain and extra-terminal inhibitor efficacy in melanoma.

Abstract:

:Bromodomain and extra-terminal inhibitors (BETi) delay tumor growth, in part, through tumor cell intrinsic alterations and initiation of anti-tumor CD8+ T-cell responses. By contrast, BETi effects on pro-tumoral immune responses remain unclear. Here, we show that the next-generation BETi, PLX51107, delayed tumor growth to differing degrees in Braf V600E melanoma syngeneic mouse models. These differential responses were associated with the influx of tumor-associated macrophages during BETi treatment. Tumors that were poorly responsive to PLX51107 showed increased influx of colony-stimulating factor-1 receptor (CSF-1R)-positive tumor-associated macrophages. We depleted CSF-1R+ tumor-associated macrophages with the CSF-1R inhibitor, PLX3397, in combination with PLX51107. Treatment with PLX3397 enhanced the efficacy of PLX51107 in poorly responsive Braf V600E syngeneic melanomas in vivo. These findings suggest that tumor-associated macrophage accumulation limits BETi efficacy and that co-treatment with PLX3397 can improve response to PLX51107, offering a potential novel combination therapy for metastatic melanoma patients.

authors

Erkes DA,Rosenbaum SR,Field CO,Chervoneva I,Villanueva J,Aplin AE

doi

10.1111/pcmr.12845

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

372-377

issue

2

eissn

1755-1471

issn

1755-148X

journal_volume

33

pub_type

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