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- W4213190654 abstract "Understanding how the tumor microenvironment is shaped by various factors is important for the development of new therapeutic strategies. Tumor cells often undergo spontaneous apoptotic cell death in tumor microenvironment, these apoptotic cells are histologically co-localized with immunosuppressive macrophages. However, the mechanism by which tumor cell apoptosis modulates macrophage polarization is not fully understood. In this study, we aimed to explore the tumor promoting effects of apoptotic tumor cells and the signal pathways involved.Apoptotic cells and macrophages in tumors were detected by immunohistochemical staining. Morphological analysis was performed with Giemsa staining. Lipids generated from apoptotic cells were detected by liquid chromatography-mass spectrometry. Phosphatidylserine-containing liposomes were prepared to mimic apoptotic cells. The expression of protein was determined by real-time PCR, immunohistochemistry enzyme-linked immunosorbent assay and Western blotting. Mouse malignant ascites and subcutaneous tumor models were designed for in vivo analysis. Transgenic mice with specific genes knocked out and inhibitors specific to certain proteins were used for the mechanistic studies.The location and the number of apoptotic cells were correlated with that of macrophages in several types of carcinomas. Phosphatidylserine, a lipid molecule generated in apoptotic cells, induced polarization and accumulation of M2-like macrophages in vivo and in vitro. Moreover, sustained administration of phosphoserine promoted tumor growth in the malignant ascites and subcutaneous tumor models. Further analyses suggested that phosphoserine induced a M2-like phenotype in macrophages, which was related to the activation of phosphoserine receptors including T-cell immunoglobin mucin 4 (TIM4) and the FAK-SRC-STAT3 signaling pathway as well as elevated the expression of the histone demethylase Jumonji domain-containing protein 3 (JMJD3). Administration of specific inhibitors of these pathways could reduce tumor progression.This study suggest that apoptotic cell-generated phosphoserine might be a notable signal for immunosuppressive macrophages in tumors, and the related pathways might be potential therapeutic targets for cancer therapy." @default.
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- W4213190654 date "2022-02-22" @default.
- W4213190654 modified "2023-10-13" @default.
- W4213190654 title "Phosphatidylserine released from apoptotic cells in tumor induces M2‐like macrophage polarization through the PSR‐STAT3‐JMJD3 axis" @default.
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- W4213190654 doi "https://doi.org/10.1002/cac2.12272" @default.
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