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• W2885223357 abstract "In normal myelopoiesis, immature myeloid cells (IMCs) differentiate into macrophages, neutrophils or dendritic cells, a process that is tightly controlled by transcription factors and epigenetic regulators. However, under tumor burden, IMCs differentiate into myeloid derived suppressor cells (MDSCs) and with subsequent up-regulation of immune suppressive factors and a pro-tumor effect. In prior studies, we found that MDSCs from HDAC11 KO mice displayed an increased T-cell suppressive activity that was associated with a more aggressive tumor growth as compared to MDSCs from wild type control mice. Unlike MDSC9s in which absence of HDAC11 is associated with a suppressive phenotype, T-cell lacking HDAC11 are hyper-reactive and endowed with strong antitumor activity. To assess which phenotype will be the dominant one in vivo, we performed adoptive immune cell transfer experiments of MDSC and/or T-cells from HDAC11 KO mice into C57BL/6 tumor-bearing mice. The transfer of HDAC11KO MDSCs was able to eliminate, at least partially, the anti-tumor effect elicited by the adoptive transfer of HDAC11KO T cells. Mechanistically we have found that MDSCs lacking HDAC11 displayed up-regulation of expression and enzymatic activity of arginase 1 and Nos2, two enzymes that are crucial in regulating MDSCs suppressive function. The aberrant enzymatic activities of Arg1 and Nos2 in HDAC11KO MDSCs correlate with over-expression of the lineage-specific transcription factor C/EBPβ, which has been shown to be essential for the differentiation of functional MDSCs. Furthermore, ChIP analysis confirmed that HDAC11 is recruited to the C/EBPβ gene promoter where exerts a negative regulatory effect upon gene transcription. Taken together, we have uncovered a previously unknown role for HDAC11 as a transcriptional regulator of MDSCs function. A better understanding of this novel role of HDAC11 in myeloid biology will lead to targeted epigenetic therapies to manipulate the suppressive effect of these immunoregulatory cells. Citation Format: Jie Chen, Fengdong Cheng, Eva Sahakian, John Powers, Zi Wang, Alejandro Villagra, Javier Pinilla-Ibarz, Eduardo M. Sotomayor. HDAC11 function as a transcriptional regulator in immature myeloid cells to myeloid-derived suppressor cells transition [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 4967." @default.
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• W2885223357 date "2018-07-01" @default.
• W2885223357 modified "2023-09-25" @default.
• W2885223357 title "Abstract 4967: HDAC11 function as a transcriptional regulator in immature myeloid cells to myeloid-derived suppressor cells transition" @default.
• W2885223357 doi "https://doi.org/10.1158/1538-7445.am2018-4967" @default.
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