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Single-Cell RNA-Seq Analysis Reveals Macrophage Involved in Pathogenesis of Human sporadic type A aortic dissection

ABSTRACT: Single-Cell RNA-Seq Analysis Reveals Macrophage Involved in Pathogenesis of Human sporadic type A aortic dissection

PROVIDER: PRJNA882355 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR21639204_1.fastq.gz	Fastqsanger.gz
	SRR21639204_2.fastq.gz	Fastqsanger.gz
	SRR21639205_1.fastq.gz	Fastqsanger.gz
	SRR21639205_2.fastq.gz	Fastqsanger.gz
	SRR21639206_1.fastq.gz	Fastqsanger.gz

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Single-Cell RNA-Seq Analysis Reveals Macrophage Involved in Pathogenesis of Human sporadic type A aortic dissection

Project description:Macrophages play an important role in the progression of sporadic acute type A aortic dissection (ATAAD). The aim of this study was to characterize the cellular heterogeneity of macrophages in AD tissues by scRNA-seq. Ascending aortic wall tissue from 6 ATAAD patients and 3 heart transplant donors were assessed by scRNA-seq, then analyzed and validated by various bioinformatics algo-rithms and histopathology experiments. The results revealed the proportion of macrophages in AD tissues (24.51%) was significantly higher than that in normal tissues (13.69%). Among the 6 macro-phage subclusters, pro-inflammatory macrophages accounted for 14.96% in the AD group, and 0.18% in the normal group. Chemokine and inflammation related genes (CCL2, CCL20, S100A8, and S100A9) were expressed more intensively in macrophages in AD tissue than that in the normal tissues. Ad-ditionally, intercellular communication analysis and transcription factor analysis indicated activation of inflammation and degradation of the extracellular matrix in AD tissues. Finally, immunohisto-chemistry, immunofluorescence and western blot experiments confirmed the overexpression of macrophage marker genes (CD68 and CD163) and matrix metalloproteinases (MMP9 and MMP2) in AD tissues. Collectively, our study provides a preliminary evaluation of the role of macrophages in AD and potentially aid in the development of therapeutic options in the future.

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The role of macrophage Socs3 in the pathogenesis of aortic dissection

Project description:Background—Aortic dissection (AD) is a life-threatening medical emergency caused by the abrupt destruction of the intimomedial layer of the aortic walls. As previous studies have reported the involvement of proinflammatory cytokine IL-6 in AD pathogenesis, we investigated the role of Stat3 signaling, a downstream pathway of IL-6 in macrophages in pathogenesis of AD. Methods and Results—We characterized the pathological and molecular events triggered by aortic stress, which can lead to AD. Aortic stress on the suprarenal aorta due to infrarenal aorta stiffening and angiotensin II infusion for 1 week caused focal medial rupture at the branching point of the celiac trunk and superior mesenteric artery. This focal medial rupture in 6 weeks in wild type (WT) mice but progressed to AD in mice with macrophage-specific deletion of Socs3 gene (mSocs3-KO). mSocs3-KO mice showed premature activation of cell proliferation, an inflammatory response, and skewed differentiation of macrophages toward the tissue-destructive phenotype. Concomitantly, they showed aberrant phenotypic modulation of SMCs and TGFβ signaling, which are likely to participate in tissue repair. Human AD samples revealed STAT3 activation in adventitial macrophages adjacent to the site of tissue destruction. Conclusions—These findings suggest that AD development is preceded by focal medial rupture, in which macrophage Socs3 maintains proper inflammatory response and differentiation of SMCs, thus promoting fibrotic healing to prevent tissue destruction and AD development. Understanding the sequence of the pathological and molecular events preceding AD development will help predict and prevent AD development and progression.

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