Journal
CELL DEATH & DISEASE
Volume 12, Issue 8, Pages -Publisher
SPRINGERNATURE
DOI: 10.1038/s41419-021-04047-2
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Funding
- Central Laboratory, Cancer Hospital of Shantou University Medical College
- Guangdong Provincial Key Laboratory of Breast Cancer Diagnosis and Treatment
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The study revealed that HDAC2 promotes IFN gamma-induced PD-L1 expression in TNBC cells by regulating the phosphorylation of JAK1, JAK2, STAT1, as well as the translocation and recruitment of STAT1 to the PD-L1 promoter. Knockout of HDAC2 resulted in reduced proliferation, migration, and cell cycle of TNBC cells, as well as inhibited IFN gamma-induced PD-L1 expression, lymphocyte infiltration, and tumor growth and metastasis in breast cancer mouse models. This suggests that targeting HDAC2 in TNBC may enhance antitumor immunity.
The PD-L1 overexpression is an important event of immune escape and metastasis in triple-negative breast cancer (TNBC), but the molecular mechanism remains to be determined. Interferon gamma (IFN gamma) represents a major driving force behind PD-L1 expression in tumor microenvironment, and histone deacetylase 2 (HDAC2) is required for IFN signaling. Here, we investigated the regulation of HDAC2 on the IFN gamma-induced PD-L1 expression in TNBC cells. We found the HDAC2 and PD-L1 expression in TNBC was significantly higher than that in non-TNBC, and HDAC2 was positively correlated with PD-L1 expression. HDAC2 promoted PD-L1 induction by upregulating the phosphorylation of JAK1, JAK2, and STAT1, as well as the translocation of STAT1 to the nucleus and the recruitment of STAT1 to the PD-L1 promoter. Meanwhile, HDAC2 was recruited to the PD-L1 promoter by STAT1, and HDAC2 knockout compromised IFN gamma-induced upregulation of H3K27, H3K9 acetylation, and the BRD4 recruitment in PD-L1 promoter. In addition, significant inhibition of proliferation, colony formation, migration, and cell cycle of TNBC cells were observed following knockout of HDAC2 in vitro. Furthermore, HDAC2 knockout reduced IFN gamma-induced PD-L1 expression, lymphocyte infiltration, and retarded tumor growth and metastasis in the breast cancer mouse models. This study may provide evidence that HDAC2 promotes IFN gamma-induced PD-L1 expression, suggesting a way for enhanced antitumor immunity when targeting the HDAC2 in TNBC.
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