Project description:Toxoplasma gondii is an obligate intracellular protozoan with anti-tumor activity against a variety of cancers. However, the therapeutic effect of T. gondii on colorectal cancer is unclear, and using direct Toxoplasma infection in immunotherapy involves safety concerns. This study investigated the anti-tumor effect and mechanism of exosomes derived from dendritic cells (DC) infected with T. gondii (Me49-DC-Exo). We used the density gradient centrifugation to isolate exosomes from uninfected DCs (DC-Exo) and T. gondii Me49-infected DCs (Me49-DC-Exo). The isolated exosomes were identified by transmission electron microscopy, nanoparticle tracking analysis, and western blotting. Me49-DC-Exo significantly inhibited tumor growth and reduced the proportion of M2 macrophages in the blood of tumor-bearing mice. In vitro, Me49-DC-Exo suppressed macrophage (RAW264.7) polarization to M2 phenotype. miRNA sequencing revealed that multiple miRNAs in Me49-DC-Exo were differentially expressed compared with DC-Exo. miR-182-5p, miR-155-5p, miR-125b-2-3p, and miR-155-3p were up-regulated, while miR-9-5p was significantly down-regulated. Transfecting mimics or inhibitors of these differential miRNAs into RAW264.7 cells showed that miR-155-5p promoted M1 macrophage polarization while inhibiting M2 macrophage polarization. Bioinformatics prediction and dual-luciferase reporter assay confirmed the suppressor of cytokine signaling 1 (SOCS1) as a direct target of miR-155-5p. Silencing SOCS1 gene expression in RAW264.7 cells increased CD86 + CD206 - M1 macrophage proportion and inducible nitric oxide synthase and tumor necrosis factor-α mRNA levels. However, arginase1 and transglutaminase 2 expression levels decreased. These results suggest that the exosomes inhibit macrophage polarization to M2 phenotype and regulate SOCS1 expression by delivering functional miR-155-5p. These findings provide new ideas for colorectal cancer immunotherapy.
Project description:To investigate the effects of 25-HC on the polarization of macrophage RAW264.7,RAW264.7 cells treated with 25-HC and untreated control were collected for RNA sequencing We then performed gene expression profiling analysis using data obtained from RNA-seq of RAW264.7 cell treated with 25-HC and untreated control
Project description:We sought to characterize the genomic localization of the YEATS domain protein AF9 in the macrophage-like cell line RAW 264.7 +/- LPS stimulation and +/- sodium crotonate pretreatment. We performed chromatin immunoprecipitation followed by massively parallel sequencing (ChIP-seq) for endogenous AF9 or for a FLAG-tagged AF9 transgene in RAW264.7 or a RAW264.7 cell line engineered to express FLAG-AF9, respectively.
Project description:Paeony root has long been used for its anti-inflammatory effects. In this study, the effects of albiflorin, paeoniflorin, and paeonol, compounds from paeony root, on gene expression profiles were examined in macrophages. The RAW264.7 macrophages were treated with LPS in the presence or absence of albiflorin, paeoniflorin, or paeonol. Global mRNA expression levels were detected by using an oligonucleotide microarray platform covering the mouse whole genome. Our results demonstrate that paeonol has extensive inhibitory effects on the regulation of inflammation-associated gene expression by LPS in macrophages. In addition, the predominant effect of paeonol among the tested compounds suggests that paeonol may be a major ingredient for the anti-inflammatory effect of paeony root. Keywords: RAW264.7; macrophage; inflammation; LPS; Paeony root components; dose response
Project description:Low-intensity pulsed ultrasound (LIPUS) is a special type of low intensity ultrasound. In periodontal disease, LIPUS was applied as an adjuvant and non-invasive therapeutic treatment. While, the specific mechanism of LIPUS in the treatment of periodontal disease is not quite clear.RAW264.7 cells were induced to M1/M2 macrophage-like polarization by LPS/IL4. LIPUS was performed to stimulate RAW264.7 cells at an intensity of 45 mW/cm2, 25 min, interval 24 h, twice. The polyA mRNA sequencing of LPS induced RAW264.7 cells, LPS induced and LIPUS treated RAW264.7 cells were conducted.Our results suggested that LIPUS played an anti-inflammatory role by inhibiting LPS-induced M1 polarization of RAW264.7 cells in an Wnt2b/AXIN/β-catenin dependent way. LIPUS may inhibit inflammation in periodontal diseases by regulating macrophage differentiation, so as to play a therapeutic role in periodontal diseases.