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Single-cell RNA sequencing and spatial transcriptomics reveal the osteoimmune microenvironment of biomaterial-mediated bone regeneration [scRNA-seq]

ABSTRACT: Single-cell RNA sequencing and spatial transcriptomics reveal the osteoimmune microenvironment of biomaterial-mediated bone regeneration [scRNA-seq]

PROVIDER: PRJNA1033178 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26554468_1.fastq.gz	Fastqsanger.gz
	SRR26554468_2.fastq.gz	Fastqsanger.gz
	SRR26554469_1.fastq.gz	Fastqsanger.gz
	SRR26554469_2.fastq.gz	Fastqsanger.gz
	SRR26554470_1.fastq.gz	Fastqsanger.gz

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Single-cell RNA sequencing and spatial transcriptomics reveal the osteoimmune microenvironment of biomaterial-mediated bone regeneration [scRNA-seq]

Project description:The bone-defect-repair process involves complex interaction between mesenchymal stem cells (MSCs) and immune cells, while the heterogeneity of osteoimmune microenvironment around implanted biomaterials remains elusive. By combining analysis of scRNA-seq and spatial transcriptomics technologies, we revealed that MgphiMSCs subpopulation served as the pioneers during the early stage of biomaterials-mediated bone defect healing process. They performed efficient osteogenic differentiation potential and had close interactions with immune cells. Remarkably, the MgphiMSCs could response to biomaterials-mediated osteoimmune microenvironment, rewired the polarization and osteoclastic differentiation of macrophages via midkine (MDK) signaling pathway. The inhibition of MDK activated the pro-inflammatory programs of macrophages and osteoclastogenesis. Meanwhile, multiple innate and adaptive immune-cell subsets exhibited close crosstalk between MgphiMSCs via SPP1 signaling pathway. These cellular profiles and interactions characterized in this study could broaden our understanding of the functional MSCs subpopulations at the early stage of biomaterial-mediated bone regeneration and provide the basis for the materials-designed strategies that target osteoimmune modulation.

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The Role of WTAP in Regulating Macrophage-Mediated Osteoimmune Responses and Tissue Regeneration in Periodontitis

Project description:Periodontitis, delineated by the destruction of structures that support teeth, is predominantly propelled by intricate immune responses. Immunomodulatory treatments offer considerable promise for the management of this ailment; however, the modulation of the periodontal immune microenvironment to facilitate tissue regeneration presents a substantial biomedical challenge. Herein, our study investigates the role of Wilms' tumor 1-associating protein (WTAP), a critical m6A methyltransferase, in the immunomodulation of periodontitis and assesses its viability as a therapeutic target. We observed heightened expression of WTAP in macrophages extracted from gingival tissues impacted by periodontitis, with a strong association with M1 polarization. Via loss-of-function experiments, we demonstrated that diminishing WTAP expression precipitates a transition from M1 to M2 macrophage phenotypes amidst inflammatory conditions, thus improving the periodontal immune landscape. Further, RNA sequencing and indirect co-culture assays indicated that suppressing of WTAP expression modulates osteoimmune responses and enhances the osteogenic differentiation of bone marrow stromal cells. The local deployment of adeno-associated virus-shWTAP in murine models of periodontitis robustly validated the therapeutic promise of targeting WTAP in this disease. Collectively, our findings highlight the crucial role of WTAP in orchestrating macrophage-mediated osteoimmune responses and tissue regeneration in periodontitis, proposing novel avenues for immunotherapeutic interventions in its treatment.

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Project description:Activating autologous stem cells after the implantation of biomaterials is an important process to initiate bone regeneration. Although several studies have demonstrated the mechanism of biomaterial-mediated bone regeneration, a comprehensive single-cell level transcriptomic map revealing the influence of biomaterials on regulating the temporal and spatial expression patterns of mesenchymal stem cells (MSCs) is still lacking. Herein, the osteoimmune microenvironment is depicted around the classical collagen/nanohydroxyapatite-based bone repair materials via combining analysis of single-cell RNA sequencing and spatial transcriptomics. A group of functional MSCs with high expression of matrix Gla protein (Mgp) is identified, which may serve as a pioneer subpopulation involved in bone repair. Remarkably, these Mgp high-expressing MSCs (MgphiMSCs) exhibit efficient osteogenic differentiation potential and orchestrate the osteoimmune microenvironment around implanted biomaterials, rewiring the polarization and osteoclastic differentiation of macrophages through the Mdk/Lrp1 ligand-receptor pair. The inhibition of Mdk/Lrp1 activates the pro-inflammatory programs of macrophages and osteoclastogenesis. Meanwhile, multiple immune-cell subsets also exhibit close crosstalk between MgphiMSCs via the secreted phosphoprotein 1 (SPP1) signaling pathway. These cellular profiles and interactions characterized in this study can broaden the understanding of the functional MSC subpopulations at the early stage of biomaterial-mediated bone regeneration and provide the basis for materials-designed strategies that target osteoimmune modulation.

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