Class IIa HDAC inhibition reduces breast tumours and metastases through anti-tumour macrophages
- PMID:28273064
- PMCID: PMC8170529
- DOI: 10.1038/nature21409
Class IIa HDAC inhibition reduces breast tumours and metastases through anti-tumour macrophages
Abstract
Although the main focus of immuno-oncology has been manipulating the adaptive immune system, harnessing both the innate and adaptive arms of the immune system might produce superior tumour reduction and elimination. Tumour-associated macrophages often have net pro-tumour effects, but their embedded location and their untapped potential provide impetus to discover strategies to turn them against tumours. Strategies that deplete (anti-CSF-1 antibodies and CSF-1R inhibition) or stimulate (agonistic anti-CD40 or inhibitory anti-CD47 antibodies) tumour-associated macrophages have had some success. We hypothesized that pharmacologic modulation of macrophage phenotype could produce an anti-tumour effect. We previously reported that a first-in-class selective class IIa histone deacetylase (HDAC) inhibitor, TMP195, influenced human monocyte responses to the colony-stimulating factors CSF-1 and CSF-2 in vitro. Here, we utilize a macrophage-dependent autochthonous mouse model of breast cancer to demonstrate that in vivo TMP195 treatment alters the tumour microenvironment and reduces tumour burden and pulmonary metastases by modulating macrophage phenotypes. TMP195 induces the recruitment and differentiation of highly phagocytic and stimulatory macrophages within tumours. Furthermore, combining TMP195 with chemotherapy regimens or T-cell checkpoint blockade in this model significantly enhances the durability of tumour reduction. These data introduce class IIa HDAC inhibition as a means to harness the anti-tumour potential of macrophages to enhance cancer therapy.
Conflict of interest statement
Authors declare competing financial interests.
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Comment in
- Anticancer therapy: Re-educating macrophages.Villanueva MT.Villanueva MT.Nat Rev Drug Discov. 2017 Apr 28;16(5):313. doi: 10.1038/nrd.2017.82.Nat Rev Drug Discov. 2017.PMID:28450718No abstract available.
- Harnessing class II histone deacetylases in macrophages to combat breast cancer.Reichman H, Munitz A.Reichman H, et al.Cell Mol Immunol. 2017 Jul;14(7):575-577. doi: 10.1038/cmi.2017.32. Epub 2017 May 29.Cell Mol Immunol. 2017.PMID:28552905Free PMC article.No abstract available.
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